From: "Matthew Wilcox (Oracle)" <willy at infradead.org> This series adds a readahead address_space operation to eventually replace the readpages operation. The key difference is that pages are added to the page cache as they are allocated (and then looked up by the filesystem) instead of passing them on a list to the readpages operation and having the filesystem add them to the page cache. It's a net reduction in code for each implementation, more efficient than walking a list, and solves the direct-write vs buffered-read problem reported by yu kuai at https://urldefense.com/v3/__https://lore.kernel.org/linux-fsdevel/20200116063601.39201-1-yukuai3 at huawei.com/__;!!GqivPVa7Brio!PtIesPWlAr4qdEASxdQ8iLJaLXhbYeTh-Jtaa7fhr8lAutp_j6aTaib8mzYD6v40q344mg$ The only unconverted filesystems are those which use fscache. Their conversion is pending Dave Howells' rewrite which will make the conversion substantially easier. v6: - Name the private members of readahead_control with a leading underscore (suggested by Christoph Hellwig) - Fix whitespace in rst file - Remove misleading comment in btrfs patch - Add readahead_next() API and use it in iomap - Add iomap_readahead kerneldoc. - Fix the mpage_readahead kerneldoc - Make various readahead functions return void - Keep readahead_index() and readahead_offset() pointing to the start of this batch through the body. No current user requires this, but it's less surprising. - Add kerneldoc for page_cache_readahead_limit - Make page_idx an unsigned long, and rename it to just 'i' - Get rid of page_offset local variable - Add patch to call memalloc_nofs_save() before allocating pages (suggested by Michal Hocko) - Resplit a lot of patches for more logical progression and easier review (suggested by John Hubbard) - Added sign-offs where received, and I deemed still relevant v5 switched to passing a readahead_control struct (mirroring the writepages_control struct passed to writepages). This has a number of advantages: - It fixes a number of bugs in various implementations, eg forgetting to increment 'start', an off-by-one error in 'nr_pages' or treating 'start' as a byte offset instead of a page offset. - It allows us to change the arguments without changing all the implementations of ->readahead which just call mpage_readahead() or iomap_readahead() - Figuring out which pages haven't been attempted by the implementation is more natural this way. - There's less code in each implementation. Matthew Wilcox (Oracle) (19): mm: Return void from various readahead functions mm: Ignore return value of ->readpages mm: Use readahead_control to pass arguments mm: Rearrange readahead loop mm: Remove 'page_offset' from readahead loop mm: rename readahead loop variable to 'i' mm: Put readahead pages in cache earlier mm: Add readahead address space operation mm: Add page_cache_readahead_limit fs: Convert mpage_readpages to mpage_readahead btrfs: Convert from readpages to readahead erofs: Convert uncompressed files from readpages to readahead erofs: Convert compressed files from readpages to readahead ext4: Convert from readpages to readahead f2fs: Convert from readpages to readahead fuse: Convert from readpages to readahead iomap: Restructure iomap_readpages_actor iomap: Convert from readpages to readahead mm: Use memalloc_nofs_save in readahead path Documentation/filesystems/locking.rst | 6 +- Documentation/filesystems/vfs.rst | 13 ++ drivers/staging/exfat/exfat_super.c | 7 +- fs/block_dev.c | 7 +- fs/btrfs/extent_io.c | 46 ++----- fs/btrfs/extent_io.h | 3 +- fs/btrfs/inode.c | 16 +-- fs/erofs/data.c | 39 ++---- fs/erofs/zdata.c | 29 ++-- fs/ext2/inode.c | 10 +- fs/ext4/ext4.h | 3 +- fs/ext4/inode.c | 23 ++-- fs/ext4/readpage.c | 22 ++- fs/ext4/verity.c | 35 +---- fs/f2fs/data.c | 50 +++---- fs/f2fs/f2fs.h | 5 +- fs/f2fs/verity.c | 35 +---- fs/fat/inode.c | 7 +- fs/fuse/file.c | 46 +++---- fs/gfs2/aops.c | 23 ++-- fs/hpfs/file.c | 7 +- fs/iomap/buffered-io.c | 118 +++++++---------- fs/iomap/trace.h | 2 +- fs/isofs/inode.c | 7 +- fs/jfs/inode.c | 7 +- fs/mpage.c | 38 ++---- fs/nilfs2/inode.c | 15 +-- fs/ocfs2/aops.c | 34 ++--- fs/omfs/file.c | 7 +- fs/qnx6/inode.c | 7 +- fs/reiserfs/inode.c | 8 +- fs/udf/inode.c | 7 +- fs/xfs/xfs_aops.c | 13 +- fs/zonefs/super.c | 7 +- include/linux/fs.h | 2 + include/linux/iomap.h | 3 +- include/linux/mpage.h | 4 +- include/linux/pagemap.h | 90 +++++++++++++ include/trace/events/erofs.h | 6 +- include/trace/events/f2fs.h | 6 +- mm/internal.h | 8 +- mm/migrate.c | 2 +- mm/readahead.c | 184 +++++++++++++++++--------- 43 files changed, 474 insertions(+), 533 deletions(-) base-commit: 11a48a5a18c63fd7621bb050228cebf13566e4d8 -- 2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 01/19] mm: Return void from various readahead functions
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
ondemand_readahead has two callers, neither of which use the return value.
That means that both ra_submit and __do_page_cache_readahead() can return
void, and we don't need to worry that a present page in the readahead
window causes us to return a smaller nr_pages than we ought to have.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
mm/internal.h | 8 ++++----
mm/readahead.c | 24 ++++++++++--------------
2 files changed, 14 insertions(+), 18 deletions(-)
diff --git a/mm/internal.h b/mm/internal.h
index 3cf20ab3ca01..f779f058118b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -49,18 +49,18 @@ void unmap_page_range(struct mmu_gather *tlb,
unsigned long addr, unsigned long end,
struct zap_details *details);
-extern unsigned int __do_page_cache_readahead(struct address_space *mapping,
+extern void __do_page_cache_readahead(struct address_space *mapping,
struct file *filp, pgoff_t offset, unsigned long nr_to_read,
unsigned long lookahead_size);
/*
* Submit IO for the read-ahead request in file_ra_state.
*/
-static inline unsigned long ra_submit(struct file_ra_state *ra,
+static inline void ra_submit(struct file_ra_state *ra,
struct address_space *mapping, struct file *filp)
{
- return __do_page_cache_readahead(mapping, filp,
- ra->start, ra->size, ra->async_size);
+ __do_page_cache_readahead(mapping, filp,
+ ra->start, ra->size, ra->async_size);
}
/*
diff --git a/mm/readahead.c b/mm/readahead.c
index 2fe72cd29b47..8ce46d69e6ae 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -149,10 +149,8 @@ static int read_pages(struct address_space *mapping, struct
file *filp,
* the pages first, then submits them for I/O. This avoids the very bad
* behaviour which would occur if page allocations are causing VM writeback.
* We really don't want to intermingle reads and writes like that.
- *
- * Returns the number of pages requested, or the maximum amount of I/O allowed.
*/
-unsigned int __do_page_cache_readahead(struct address_space *mapping,
+void __do_page_cache_readahead(struct address_space *mapping,
struct file *filp, pgoff_t offset, unsigned long nr_to_read,
unsigned long lookahead_size)
{
@@ -166,7 +164,7 @@ unsigned int __do_page_cache_readahead(struct address_space
*mapping,
gfp_t gfp_mask = readahead_gfp_mask(mapping);
if (isize == 0)
- goto out;
+ return;
end_index = ((isize - 1) >> PAGE_SHIFT);
@@ -211,8 +209,6 @@ unsigned int __do_page_cache_readahead(struct address_space
*mapping,
if (nr_pages)
read_pages(mapping, filp, &page_pool, nr_pages, gfp_mask);
BUG_ON(!list_empty(&page_pool));
-out:
- return nr_pages;
}
/*
@@ -378,11 +374,10 @@ static int try_context_readahead(struct address_space
*mapping,
/*
* A minimal readahead algorithm for trivial sequential/random reads.
*/
-static unsigned long
-ondemand_readahead(struct address_space *mapping,
- struct file_ra_state *ra, struct file *filp,
- bool hit_readahead_marker, pgoff_t offset,
- unsigned long req_size)
+static void ondemand_readahead(struct address_space *mapping,
+ struct file_ra_state *ra, struct file *filp,
+ bool hit_readahead_marker, pgoff_t offset,
+ unsigned long req_size)
{
struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
unsigned long max_pages = ra->ra_pages;
@@ -428,7 +423,7 @@ ondemand_readahead(struct address_space *mapping,
rcu_read_unlock();
if (!start || start - offset > max_pages)
- return 0;
+ return;
ra->start = start;
ra->size = start - offset; /* old async_size */
@@ -464,7 +459,8 @@ ondemand_readahead(struct address_space *mapping,
* standalone, small random read
* Read as is, and do not pollute the readahead state.
*/
- return __do_page_cache_readahead(mapping, filp, offset, req_size, 0);
+ __do_page_cache_readahead(mapping, filp, offset, req_size, 0);
+ return;
initial_readahead:
ra->start = offset;
@@ -489,7 +485,7 @@ ondemand_readahead(struct address_space *mapping,
}
}
- return ra_submit(ra, mapping, filp);
+ ra_submit(ra, mapping, filp);
}
/**
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 02/19] mm: Ignore return value of ->readpages
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
We used to assign the return value to a variable, which we then ignored.
Remove the pretence of caring.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Reviewed-by: Christoph Hellwig <hch at lst.de>
---
mm/readahead.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 8ce46d69e6ae..12d13b7792da 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -113,17 +113,16 @@ int read_cache_pages(struct address_space *mapping, struct
list_head *pages,
EXPORT_SYMBOL(read_cache_pages);
-static int read_pages(struct address_space *mapping, struct file *filp,
+static void read_pages(struct address_space *mapping, struct file *filp,
struct list_head *pages, unsigned int nr_pages, gfp_t gfp)
{
struct blk_plug plug;
unsigned page_idx;
- int ret;
blk_start_plug(&plug);
if (mapping->a_ops->readpages) {
- ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
+ mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
/* Clean up the remaining pages */
put_pages_list(pages);
goto out;
@@ -136,12 +135,9 @@ static int read_pages(struct address_space *mapping, struct
file *filp,
mapping->a_ops->readpage(filp, page);
put_page(page);
}
- ret = 0;
out:
blk_finish_plug(&plug);
-
- return ret;
}
/*
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 03/19] mm: Use readahead_control to pass arguments
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
In this patch, only between __do_page_cache_readahead() and
read_pages(), but it will be extended in upcoming patches. Also add
the readahead_count() accessor.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
include/linux/pagemap.h | 17 +++++++++++++++++
mm/readahead.c | 36 +++++++++++++++++++++---------------
2 files changed, 38 insertions(+), 15 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ccb14b6a16b5..982ecda2d4a2 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -630,6 +630,23 @@ static inline int add_to_page_cache(struct page *page,
return error;
}
+/*
+ * Readahead is of a block of consecutive pages.
+ */
+struct readahead_control {
+ struct file *file;
+ struct address_space *mapping;
+/* private: use the readahead_* accessors instead */
+ pgoff_t _start;
+ unsigned int _nr_pages;
+};
+
+/* The number of pages in this readahead block */
+static inline unsigned int readahead_count(struct readahead_control *rac)
+{
+ return rac->_nr_pages;
+}
+
static inline unsigned long dir_pages(struct inode *inode)
{
return (unsigned long)(inode->i_size + PAGE_SIZE - 1) >>
diff --git a/mm/readahead.c b/mm/readahead.c
index 12d13b7792da..15329309231f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -113,26 +113,29 @@ int read_cache_pages(struct address_space *mapping, struct
list_head *pages,
EXPORT_SYMBOL(read_cache_pages);
-static void read_pages(struct address_space *mapping, struct file *filp,
- struct list_head *pages, unsigned int nr_pages, gfp_t gfp)
+static void read_pages(struct readahead_control *rac, struct list_head *pages,
+ gfp_t gfp)
{
+ const struct address_space_operations *aops = rac->mapping->a_ops;
struct blk_plug plug;
unsigned page_idx;
blk_start_plug(&plug);
- if (mapping->a_ops->readpages) {
- mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
+ if (aops->readpages) {
+ aops->readpages(rac->file, rac->mapping, pages,
+ readahead_count(rac));
/* Clean up the remaining pages */
put_pages_list(pages);
goto out;
}
- for (page_idx = 0; page_idx < nr_pages; page_idx++) {
+ for (page_idx = 0; page_idx < readahead_count(rac); page_idx++) {
struct page *page = lru_to_page(pages);
list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping, page->index, gfp))
- mapping->a_ops->readpage(filp, page);
+ if (!add_to_page_cache_lru(page, rac->mapping, page->index,
+ gfp))
+ aops->readpage(rac->file, page);
put_page(page);
}
@@ -155,9 +158,13 @@ void __do_page_cache_readahead(struct address_space
*mapping,
unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
int page_idx;
- unsigned int nr_pages = 0;
loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
+ struct readahead_control rac = {
+ .mapping = mapping,
+ .file = filp,
+ ._nr_pages = 0,
+ };
if (isize == 0)
return;
@@ -180,10 +187,9 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* contiguous pages before continuing with the next
* batch.
*/
- if (nr_pages)
- read_pages(mapping, filp, &page_pool, nr_pages,
- gfp_mask);
- nr_pages = 0;
+ if (readahead_count(&rac))
+ read_pages(&rac, &page_pool, gfp_mask);
+ rac._nr_pages = 0;
continue;
}
@@ -194,7 +200,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
list_add(&page->lru, &page_pool);
if (page_idx == nr_to_read - lookahead_size)
SetPageReadahead(page);
- nr_pages++;
+ rac._nr_pages++;
}
/*
@@ -202,8 +208,8 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* uptodate then the caller will launch readpage again, and
* will then handle the error.
*/
- if (nr_pages)
- read_pages(mapping, filp, &page_pool, nr_pages, gfp_mask);
+ if (readahead_count(&rac))
+ read_pages(&rac, &page_pool, gfp_mask);
BUG_ON(!list_empty(&page_pool));
}
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 04/19] mm: Rearrange readahead loop
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Move the declaration of 'page' to inside the loop and move the 'kick
off a fresh batch' code to the end of the function for easier use in
subsequent patches.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
mm/readahead.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 15329309231f..3eca59c43a45 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -154,7 +154,6 @@ void __do_page_cache_readahead(struct address_space
*mapping,
unsigned long lookahead_size)
{
struct inode *inode = mapping->host;
- struct page *page;
unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
int page_idx;
@@ -175,6 +174,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* Preallocate as many pages as we will need.
*/
for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
+ struct page *page;
pgoff_t page_offset = offset + page_idx;
if (page_offset > end_index)
@@ -183,14 +183,14 @@ void __do_page_cache_readahead(struct address_space
*mapping,
page = xa_load(&mapping->i_pages, page_offset);
if (page && !xa_is_value(page)) {
/*
- * Page already present? Kick off the current batch of
- * contiguous pages before continuing with the next
- * batch.
+ * Page already present? Kick off the current batch
+ * of contiguous pages before continuing with the
+ * next batch. This page may be the one we would
+ * have intended to mark as Readahead, but we don't
+ * have a stable reference to this page, and it's
+ * not worth getting one just for that.
*/
- if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
- rac._nr_pages = 0;
- continue;
+ goto read;
}
page = __page_cache_alloc(gfp_mask);
@@ -201,6 +201,11 @@ void __do_page_cache_readahead(struct address_space
*mapping,
if (page_idx == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
+ continue;
+read:
+ if (readahead_count(&rac))
+ read_pages(&rac, &page_pool, gfp_mask);
+ rac._nr_pages = 0;
}
/*
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 04/16] mm: Tweak readahead loop slightly
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Eliminate the page_offset variable which was just confusing;
record the start of each consecutive run of pages in the
readahead_control, and move the 'kick off a fresh batch' code to
the end of the function for easier use in the next patch.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
mm/readahead.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 15329309231f..74791b96013f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -154,7 +154,6 @@ void __do_page_cache_readahead(struct address_space
*mapping,
unsigned long lookahead_size)
{
struct inode *inode = mapping->host;
- struct page *page;
unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
int page_idx;
@@ -163,6 +162,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
struct readahead_control rac = {
.mapping = mapping,
.file = filp,
+ ._start = offset,
._nr_pages = 0,
};
@@ -175,32 +175,39 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* Preallocate as many pages as we will need.
*/
for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
- pgoff_t page_offset = offset + page_idx;
+ struct page *page;
- if (page_offset > end_index)
+ if (offset > end_index)
break;
- page = xa_load(&mapping->i_pages, page_offset);
+ page = xa_load(&mapping->i_pages, offset);
if (page && !xa_is_value(page)) {
/*
- * Page already present? Kick off the current batch of
- * contiguous pages before continuing with the next
- * batch.
+ * Page already present? Kick off the current batch
+ * of contiguous pages before continuing with the
+ * next batch. This page may be the one we would
+ * have intended to mark as Readahead, but we don't
+ * have a stable reference to this page, and it's
+ * not worth getting one just for that.
*/
- if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
- rac._nr_pages = 0;
- continue;
+ goto read;
}
page = __page_cache_alloc(gfp_mask);
if (!page)
break;
- page->index = page_offset;
+ page->index = offset;
list_add(&page->lru, &page_pool);
if (page_idx == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
+ offset++;
+ continue;
+read:
+ if (readahead_count(&rac))
+ read_pages(&rac, &page_pool, gfp_mask);
+ rac._nr_pages = 0;
+ rac._start = ++offset;
}
/*
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 05/16] mm: Put readahead pages in cache earlier
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
At allocation time, put the pages in the cache unless we're using
->readpages. Add the readahead_for_each() iterator for the benefit of
the ->readpage fallback. This iterator supports huge pages, even though
none of the filesystems to be converted do yet.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
include/linux/pagemap.h | 24 ++++++++++++++++++++++++
mm/readahead.c | 34 +++++++++++++++++-----------------
2 files changed, 41 insertions(+), 17 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 982ecda2d4a2..3613154e79e4 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -639,8 +639,32 @@ struct readahead_control {
/* private: use the readahead_* accessors instead */
pgoff_t _start;
unsigned int _nr_pages;
+ unsigned int _batch_count;
};
+static inline struct page *readahead_page(struct readahead_control *rac)
+{
+ struct page *page;
+
+ if (!rac->_nr_pages)
+ return NULL;
+
+ page = xa_load(&rac->mapping->i_pages, rac->_start);
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ rac->_batch_count = hpage_nr_pages(page);
+
+ return page;
+}
+
+static inline void readahead_next(struct readahead_control *rac)
+{
+ rac->_nr_pages -= rac->_batch_count;
+ rac->_start += rac->_batch_count;
+}
+
+#define readahead_for_each(rac, page) \
+ for (; (page = readahead_page(rac)); readahead_next(rac))
+
/* The number of pages in this readahead block */
static inline unsigned int readahead_count(struct readahead_control *rac)
{
diff --git a/mm/readahead.c b/mm/readahead.c
index 74791b96013f..7663de534734 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -113,12 +113,11 @@ int read_cache_pages(struct address_space *mapping, struct
list_head *pages,
EXPORT_SYMBOL(read_cache_pages);
-static void read_pages(struct readahead_control *rac, struct list_head *pages,
- gfp_t gfp)
+static void read_pages(struct readahead_control *rac, struct list_head *pages)
{
const struct address_space_operations *aops = rac->mapping->a_ops;
+ struct page *page;
struct blk_plug plug;
- unsigned page_idx;
blk_start_plug(&plug);
@@ -127,19 +126,13 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages,
readahead_count(rac));
/* Clean up the remaining pages */
put_pages_list(pages);
- goto out;
- }
-
- for (page_idx = 0; page_idx < readahead_count(rac); page_idx++) {
- struct page *page = lru_to_page(pages);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, rac->mapping, page->index,
- gfp))
+ } else {
+ readahead_for_each(rac, page) {
aops->readpage(rac->file, page);
- put_page(page);
+ put_page(page);
+ }
}
-out:
blk_finish_plug(&plug);
}
@@ -159,6 +152,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
int page_idx;
loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
+ bool use_list = mapping->a_ops->readpages;
struct readahead_control rac = {
.mapping = mapping,
.file = filp,
@@ -196,8 +190,14 @@ void __do_page_cache_readahead(struct address_space
*mapping,
page = __page_cache_alloc(gfp_mask);
if (!page)
break;
- page->index = offset;
- list_add(&page->lru, &page_pool);
+ if (use_list) {
+ page->index = offset;
+ list_add(&page->lru, &page_pool);
+ } else if (add_to_page_cache_lru(page, mapping, offset,
+ gfp_mask) < 0) {
+ put_page(page);
+ goto read;
+ }
if (page_idx == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
@@ -205,7 +205,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
continue;
read:
if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
+ read_pages(&rac, &page_pool);
rac._nr_pages = 0;
rac._start = ++offset;
}
@@ -216,7 +216,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* will then handle the error.
*/
if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
+ read_pages(&rac, &page_pool);
BUG_ON(!list_empty(&page_pool));
}
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 05/19] mm: Remove 'page_offset' from readahead loop
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Eliminate the page_offset variable which was confusing with the
'offset' parameter and record the start of each consecutive run of
pages in the readahead_control.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
mm/readahead.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 3eca59c43a45..74791b96013f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -162,6 +162,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
struct readahead_control rac = {
.mapping = mapping,
.file = filp,
+ ._start = offset,
._nr_pages = 0,
};
@@ -175,12 +176,11 @@ void __do_page_cache_readahead(struct address_space
*mapping,
*/
for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
struct page *page;
- pgoff_t page_offset = offset + page_idx;
- if (page_offset > end_index)
+ if (offset > end_index)
break;
- page = xa_load(&mapping->i_pages, page_offset);
+ page = xa_load(&mapping->i_pages, offset);
if (page && !xa_is_value(page)) {
/*
* Page already present? Kick off the current batch
@@ -196,16 +196,18 @@ void __do_page_cache_readahead(struct address_space
*mapping,
page = __page_cache_alloc(gfp_mask);
if (!page)
break;
- page->index = page_offset;
+ page->index = offset;
list_add(&page->lru, &page_pool);
if (page_idx == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
+ offset++;
continue;
read:
if (readahead_count(&rac))
read_pages(&rac, &page_pool, gfp_mask);
rac._nr_pages = 0;
+ rac._start = ++offset;
}
/*
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 06/16] mm: Add readahead address space operation
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
This replaces ->readpages with a saner interface:
- Return void instead of an ignored error code.
- Pages are already in the page cache when ->readahead is called.
- Implementation looks up the pages in the page cache instead of
having them passed in a linked list.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
Documentation/filesystems/locking.rst | 6 +++++-
Documentation/filesystems/vfs.rst | 13 +++++++++++++
include/linux/fs.h | 2 ++
include/linux/pagemap.h | 18 ++++++++++++++++++
mm/readahead.c | 8 +++++++-
5 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/Documentation/filesystems/locking.rst
b/Documentation/filesystems/locking.rst
index 5057e4d9dcd1..0ebc4491025a 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -239,6 +239,7 @@ prototypes::
int (*readpage)(struct file *, struct page *);
int (*writepages)(struct address_space *, struct writeback_control *);
int (*set_page_dirty)(struct page *page);
+ void (*readahead)(struct readahead_control *);
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
int (*write_begin)(struct file *, struct address_space *mapping,
@@ -271,7 +272,8 @@ writepage: yes, unlocks (see below)
readpage: yes, unlocks
writepages:
set_page_dirty no
-readpages:
+readahead: yes, unlocks
+readpages: no
write_begin: locks the page exclusive
write_end: yes, unlocks exclusive
bmap:
@@ -295,6 +297,8 @@ the request handler (/dev/loop).
->readpage() unlocks the page, either synchronously or via I/O
completion.
+->readahead() unlocks the pages like ->readpage().
+
->readpages() populates the pagecache with the passed pages and starts
I/O against them. They come unlocked upon I/O completion.
diff --git a/Documentation/filesystems/vfs.rst
b/Documentation/filesystems/vfs.rst
index 7d4d09dd5e6d..81ab30fbe45c 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -706,6 +706,7 @@ cache in your filesystem. The following members are
defined:
int (*readpage)(struct file *, struct page *);
int (*writepages)(struct address_space *, struct writeback_control *);
int (*set_page_dirty)(struct page *page);
+ void (*readahead)(struct readahead_control *);
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
int (*write_begin)(struct file *, struct address_space *mapping,
@@ -781,12 +782,24 @@ cache in your filesystem. The following members are
defined:
If defined, it should set the PageDirty flag, and the
PAGECACHE_TAG_DIRTY tag in the radix tree.
+``readahead``
+ Called by the VM to read pages associated with the address_space
+ object. The pages are consecutive in the page cache and are
+ locked. The implementation should decrement the page refcount
+ after starting I/O on each page. Usually the page will be
+ unlocked by the I/O completion handler. If the function does
+ not attempt I/O on some pages, the caller will decrement the page
+ refcount and unlock the pages for you. Set PageUptodate if the
+ I/O completes successfully. Setting PageError on any page will
+ be ignored; simply unlock the page if an I/O error occurs.
+
``readpages``
called by the VM to read pages associated with the address_space
object. This is essentially just a vector version of readpage.
Instead of just one page, several pages are requested.
readpages is only used for read-ahead, so read errors are
ignored. If anything goes wrong, feel free to give up.
+ This interface is deprecated; implement readahead instead.
``write_begin``
Called by the generic buffered write code to ask the filesystem
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3cd4fe6b845e..d4e2d2964346 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -292,6 +292,7 @@ enum positive_aop_returns {
struct page;
struct address_space;
struct writeback_control;
+struct readahead_control;
/*
* Write life time hint values.
@@ -375,6 +376,7 @@ struct address_space_operations {
*/
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
+ void (*readahead)(struct readahead_control *);
int (*write_begin)(struct file *, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 3613154e79e4..bd4291f78f41 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -665,6 +665,24 @@ static inline void readahead_next(struct readahead_control
*rac)
#define readahead_for_each(rac, page) \
for (; (page = readahead_page(rac)); readahead_next(rac))
+/* The byte offset into the file of this readahead block */
+static inline loff_t readahead_offset(struct readahead_control *rac)
+{
+ return (loff_t)rac->_start * PAGE_SIZE;
+}
+
+/* The number of bytes in this readahead block */
+static inline loff_t readahead_length(struct readahead_control *rac)
+{
+ return (loff_t)rac->_nr_pages * PAGE_SIZE;
+}
+
+/* The index of the first page in this readahead block */
+static inline unsigned int readahead_index(struct readahead_control *rac)
+{
+ return rac->_start;
+}
+
/* The number of pages in this readahead block */
static inline unsigned int readahead_count(struct readahead_control *rac)
{
diff --git a/mm/readahead.c b/mm/readahead.c
index 7663de534734..5be7e1cb8666 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -121,7 +121,13 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages)
blk_start_plug(&plug);
- if (aops->readpages) {
+ if (aops->readahead) {
+ aops->readahead(rac);
+ readahead_for_each(rac, page) {
+ unlock_page(page);
+ put_page(page);
+ }
+ } else if (aops->readpages) {
aops->readpages(rac->file, rac->mapping, pages,
readahead_count(rac));
/* Clean up the remaining pages */
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 06/19] mm: rename readahead loop variable to 'i'
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Change the type of page_idx to unsigned long, and rename it -- it's
just a loop counter, not a page index.
Suggested-by: John Hubbard <jhubbard at nvidia.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
mm/readahead.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 74791b96013f..bdc5759000d3 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -156,7 +156,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
struct inode *inode = mapping->host;
unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
- int page_idx;
+ unsigned long i;
loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
struct readahead_control rac = {
@@ -174,7 +174,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
/*
* Preallocate as many pages as we will need.
*/
- for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
+ for (i = 0; i < nr_to_read; i++) {
struct page *page;
if (offset > end_index)
@@ -198,7 +198,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
break;
page->index = offset;
list_add(&page->lru, &page_pool);
- if (page_idx == nr_to_read - lookahead_size)
+ if (i == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
offset++;
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 07/16] mm: Add page_cache_readahead_limit
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
ext4 and f2fs have duplicated the guts of the readahead code so
they can read past i_size. Instead, separate out the guts of the
readahead code so they can call it directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/ext4/verity.c | 35 ++-----------------------------
fs/f2fs/verity.c | 35 ++-----------------------------
include/linux/pagemap.h | 4 ++++
mm/readahead.c | 46 +++++++++++++++++++++++++----------------
4 files changed, 36 insertions(+), 84 deletions(-)
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index dc5ec724d889..f6e0bf05933e 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -342,37 +342,6 @@ static int ext4_get_verity_descriptor(struct inode *inode,
void *buf,
return desc_size;
}
-/*
- * Prefetch some pages from the file's Merkle tree.
- *
- * This is basically a stripped-down version of __do_page_cache_readahead()
- * which works on pages past i_size.
- */
-static void ext4_merkle_tree_readahead(struct address_space *mapping,
- pgoff_t start_index, unsigned long count)
-{
- LIST_HEAD(pages);
- unsigned int nr_pages = 0;
- struct page *page;
- pgoff_t index;
- struct blk_plug plug;
-
- for (index = start_index; index < start_index + count; index++) {
- page = xa_load(&mapping->i_pages, index);
- if (!page || xa_is_value(page)) {
- page = __page_cache_alloc(readahead_gfp_mask(mapping));
- if (!page)
- break;
- page->index = index;
- list_add(&page->lru, &pages);
- nr_pages++;
- }
- }
- blk_start_plug(&plug);
- ext4_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
- blk_finish_plug(&plug);
-}
-
static struct page *ext4_read_merkle_tree_page(struct inode *inode,
pgoff_t index,
unsigned long num_ra_pages)
@@ -386,8 +355,8 @@ static struct page *ext4_read_merkle_tree_page(struct inode
*inode,
if (page)
put_page(page);
else if (num_ra_pages > 1)
- ext4_merkle_tree_readahead(inode->i_mapping, index,
- num_ra_pages);
+ page_cache_readahead_limit(inode->i_mapping, NULL,
+ index, LONG_MAX, num_ra_pages, 0);
page = read_mapping_page(inode->i_mapping, index, NULL);
}
return page;
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index d7d430a6f130..71a3e36721fa 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -222,37 +222,6 @@ static int f2fs_get_verity_descriptor(struct inode *inode,
void *buf,
return size;
}
-/*
- * Prefetch some pages from the file's Merkle tree.
- *
- * This is basically a stripped-down version of __do_page_cache_readahead()
- * which works on pages past i_size.
- */
-static void f2fs_merkle_tree_readahead(struct address_space *mapping,
- pgoff_t start_index, unsigned long count)
-{
- LIST_HEAD(pages);
- unsigned int nr_pages = 0;
- struct page *page;
- pgoff_t index;
- struct blk_plug plug;
-
- for (index = start_index; index < start_index + count; index++) {
- page = xa_load(&mapping->i_pages, index);
- if (!page || xa_is_value(page)) {
- page = __page_cache_alloc(readahead_gfp_mask(mapping));
- if (!page)
- break;
- page->index = index;
- list_add(&page->lru, &pages);
- nr_pages++;
- }
- }
- blk_start_plug(&plug);
- f2fs_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
- blk_finish_plug(&plug);
-}
-
static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
pgoff_t index,
unsigned long num_ra_pages)
@@ -266,8 +235,8 @@ static struct page *f2fs_read_merkle_tree_page(struct inode
*inode,
if (page)
put_page(page);
else if (num_ra_pages > 1)
- f2fs_merkle_tree_readahead(inode->i_mapping, index,
- num_ra_pages);
+ page_cache_readahead_limit(inode->i_mapping, NULL,
+ index, LONG_MAX, num_ra_pages, 0);
page = read_mapping_page(inode->i_mapping, index, NULL);
}
return page;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index bd4291f78f41..4f36c06d064d 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -389,6 +389,10 @@ extern struct page * read_cache_page_gfp(struct
address_space *mapping,
pgoff_t index, gfp_t gfp_mask);
extern int read_cache_pages(struct address_space *mapping,
struct list_head *pages, filler_t *filler, void *data);
+void page_cache_readahead_limit(struct address_space *mapping,
+ struct file *file, pgoff_t offset, pgoff_t end_index,
+ unsigned long nr_to_read, unsigned long lookahead_size);
+
static inline struct page *read_mapping_page(struct address_space *mapping,
pgoff_t index, void *data)
diff --git a/mm/readahead.c b/mm/readahead.c
index 5be7e1cb8666..566693f4e539 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -142,35 +142,21 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages)
blk_finish_plug(&plug);
}
-/*
- * __do_page_cache_readahead() actually reads a chunk of disk. It allocates
- * the pages first, then submits them for I/O. This avoids the very bad
- * behaviour which would occur if page allocations are causing VM writeback.
- * We really don't want to intermingle reads and writes like that.
- */
-void __do_page_cache_readahead(struct address_space *mapping,
- struct file *filp, pgoff_t offset, unsigned long nr_to_read,
- unsigned long lookahead_size)
+void page_cache_readahead_limit(struct address_space *mapping,
+ struct file *file, pgoff_t offset, pgoff_t end_index,
+ unsigned long nr_to_read, unsigned long lookahead_size)
{
- struct inode *inode = mapping->host;
- unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
int page_idx;
- loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
bool use_list = mapping->a_ops->readpages;
struct readahead_control rac = {
.mapping = mapping,
- .file = filp,
+ .file = file,
._start = offset,
._nr_pages = 0,
};
- if (isize == 0)
- return;
-
- end_index = ((isize - 1) >> PAGE_SHIFT);
-
/*
* Preallocate as many pages as we will need.
*/
@@ -225,6 +211,30 @@ void __do_page_cache_readahead(struct address_space
*mapping,
read_pages(&rac, &page_pool);
BUG_ON(!list_empty(&page_pool));
}
+EXPORT_SYMBOL_GPL(page_cache_readahead_limit);
+
+/*
+ * __do_page_cache_readahead() actually reads a chunk of disk. It allocates
+ * the pages first, then submits them for I/O. This avoids the very bad
+ * behaviour which would occur if page allocations are causing VM writeback.
+ * We really don't want to intermingle reads and writes like that.
+ */
+void __do_page_cache_readahead(struct address_space *mapping,
+ struct file *file, pgoff_t offset, unsigned long nr_to_read,
+ unsigned long lookahead_size)
+{
+ struct inode *inode = mapping->host;
+ unsigned long end_index; /* The last page we want to read */
+ loff_t isize = i_size_read(inode);
+
+ if (isize == 0)
+ return;
+
+ end_index = ((isize - 1) >> PAGE_SHIFT);
+
+ page_cache_readahead_limit(mapping, file, offset, end_index,
+ nr_to_read, lookahead_size);
+}
/*
* Chunk the readahead into 2 megabyte units, so that we don't pin too much
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 07/19] mm: Put readahead pages in cache earlier
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
At allocation time, put the pages in the cache unless we're using
->readpages. Add the readahead_for_each() iterator for the benefit of
the ->readpage fallback. This iterator supports huge pages, even though
none of the filesystems to be converted do yet.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
include/linux/pagemap.h | 24 ++++++++++++++++++++++++
mm/readahead.c | 34 +++++++++++++++++-----------------
2 files changed, 41 insertions(+), 17 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 982ecda2d4a2..3613154e79e4 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -639,8 +639,32 @@ struct readahead_control {
/* private: use the readahead_* accessors instead */
pgoff_t _start;
unsigned int _nr_pages;
+ unsigned int _batch_count;
};
+static inline struct page *readahead_page(struct readahead_control *rac)
+{
+ struct page *page;
+
+ if (!rac->_nr_pages)
+ return NULL;
+
+ page = xa_load(&rac->mapping->i_pages, rac->_start);
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ rac->_batch_count = hpage_nr_pages(page);
+
+ return page;
+}
+
+static inline void readahead_next(struct readahead_control *rac)
+{
+ rac->_nr_pages -= rac->_batch_count;
+ rac->_start += rac->_batch_count;
+}
+
+#define readahead_for_each(rac, page) \
+ for (; (page = readahead_page(rac)); readahead_next(rac))
+
/* The number of pages in this readahead block */
static inline unsigned int readahead_count(struct readahead_control *rac)
{
diff --git a/mm/readahead.c b/mm/readahead.c
index bdc5759000d3..9e430daae42f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -113,12 +113,11 @@ int read_cache_pages(struct address_space *mapping, struct
list_head *pages,
EXPORT_SYMBOL(read_cache_pages);
-static void read_pages(struct readahead_control *rac, struct list_head *pages,
- gfp_t gfp)
+static void read_pages(struct readahead_control *rac, struct list_head *pages)
{
const struct address_space_operations *aops = rac->mapping->a_ops;
+ struct page *page;
struct blk_plug plug;
- unsigned page_idx;
blk_start_plug(&plug);
@@ -127,19 +126,13 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages,
readahead_count(rac));
/* Clean up the remaining pages */
put_pages_list(pages);
- goto out;
- }
-
- for (page_idx = 0; page_idx < readahead_count(rac); page_idx++) {
- struct page *page = lru_to_page(pages);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, rac->mapping, page->index,
- gfp))
+ } else {
+ readahead_for_each(rac, page) {
aops->readpage(rac->file, page);
- put_page(page);
+ put_page(page);
+ }
}
-out:
blk_finish_plug(&plug);
}
@@ -159,6 +152,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
unsigned long i;
loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
+ bool use_list = mapping->a_ops->readpages;
struct readahead_control rac = {
.mapping = mapping,
.file = filp,
@@ -196,8 +190,14 @@ void __do_page_cache_readahead(struct address_space
*mapping,
page = __page_cache_alloc(gfp_mask);
if (!page)
break;
- page->index = offset;
- list_add(&page->lru, &page_pool);
+ if (use_list) {
+ page->index = offset;
+ list_add(&page->lru, &page_pool);
+ } else if (add_to_page_cache_lru(page, mapping, offset,
+ gfp_mask) < 0) {
+ put_page(page);
+ goto read;
+ }
if (i == nr_to_read - lookahead_size)
SetPageReadahead(page);
rac._nr_pages++;
@@ -205,7 +205,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
continue;
read:
if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
+ read_pages(&rac, &page_pool);
rac._nr_pages = 0;
rac._start = ++offset;
}
@@ -216,7 +216,7 @@ void __do_page_cache_readahead(struct address_space
*mapping,
* will then handle the error.
*/
if (readahead_count(&rac))
- read_pages(&rac, &page_pool, gfp_mask);
+ read_pages(&rac, &page_pool);
BUG_ON(!list_empty(&page_pool));
}
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 08/16] fs: Convert mpage_readpages to mpage_readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Implement the new readahead aop and convert all callers (block_dev,
exfat, ext2, fat, gfs2, hpfs, isofs, jfs, nilfs2, ocfs2, omfs, qnx6,
reiserfs & udf). The callers are all trivial except for GFS2 & OCFS2.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Reviewed-by: Junxiao Bi <junxiao.bi at oracle.com> # ocfs2
---
drivers/staging/exfat/exfat_super.c | 7 +++---
fs/block_dev.c | 7 +++---
fs/ext2/inode.c | 10 +++-----
fs/fat/inode.c | 7 +++---
fs/gfs2/aops.c | 23 ++++++-----------
fs/hpfs/file.c | 7 +++---
fs/iomap/buffered-io.c | 2 +-
fs/isofs/inode.c | 7 +++---
fs/jfs/inode.c | 7 +++---
fs/mpage.c | 38 +++++++++--------------------
fs/nilfs2/inode.c | 15 +++---------
fs/ocfs2/aops.c | 34 ++++++++++----------------
fs/omfs/file.c | 7 +++---
fs/qnx6/inode.c | 7 +++---
fs/reiserfs/inode.c | 8 +++---
fs/udf/inode.c | 7 +++---
include/linux/mpage.h | 4 +--
mm/migrate.c | 2 +-
18 files changed, 73 insertions(+), 126 deletions(-)
diff --git a/drivers/staging/exfat/exfat_super.c
b/drivers/staging/exfat/exfat_super.c
index b81d2a87b82e..96aad9b16d31 100644
--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -3002,10 +3002,9 @@ static int exfat_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, exfat_get_block);
}
-static int exfat_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void exfat_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
+ mpage_readahead(rac, exfat_get_block);
}
static int exfat_writepage(struct page *page, struct writeback_control *wbc)
@@ -3104,7 +3103,7 @@ static sector_t _exfat_bmap(struct address_space *mapping,
sector_t block)
static const struct address_space_operations exfat_aops = {
.readpage = exfat_readpage,
- .readpages = exfat_readpages,
+ .readahead = exfat_readahead,
.writepage = exfat_writepage,
.writepages = exfat_writepages,
.write_begin = exfat_write_begin,
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69bf2fb6f7cd..2fd9c7bd61f6 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -614,10 +614,9 @@ static int blkdev_readpage(struct file * file, struct page
* page)
return block_read_full_page(page, blkdev_get_block);
}
-static int blkdev_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void blkdev_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block);
+ mpage_readahead(rac, blkdev_get_block);
}
static int blkdev_write_begin(struct file *file, struct address_space *mapping,
@@ -2062,7 +2061,7 @@ static int blkdev_writepages(struct address_space
*mapping,
static const struct address_space_operations def_blk_aops = {
.readpage = blkdev_readpage,
- .readpages = blkdev_readpages,
+ .readahead = blkdev_readahead,
.writepage = blkdev_writepage,
.write_begin = blkdev_write_begin,
.write_end = blkdev_write_end,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index c885cf7d724b..2875c0a705b5 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -877,11 +877,9 @@ static int ext2_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, ext2_get_block);
}
-static int
-ext2_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ext2_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, ext2_get_block);
+ mpage_readahead(rac, ext2_get_block);
}
static int
@@ -967,7 +965,7 @@ ext2_dax_writepages(struct address_space *mapping, struct
writeback_control *wbc
const struct address_space_operations ext2_aops = {
.readpage = ext2_readpage,
- .readpages = ext2_readpages,
+ .readahead = ext2_readahead,
.writepage = ext2_writepage,
.write_begin = ext2_write_begin,
.write_end = ext2_write_end,
@@ -981,7 +979,7 @@ const struct address_space_operations ext2_aops = {
const struct address_space_operations ext2_nobh_aops = {
.readpage = ext2_readpage,
- .readpages = ext2_readpages,
+ .readahead = ext2_readahead,
.writepage = ext2_nobh_writepage,
.write_begin = ext2_nobh_write_begin,
.write_end = nobh_write_end,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 594b05ae16c9..3496f5fc3e6d 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -210,10 +210,9 @@ static int fat_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, fat_get_block);
}
-static int fat_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void fat_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, fat_get_block);
+ mpage_readahead(rac, fat_get_block);
}
static void fat_write_failed(struct address_space *mapping, loff_t to)
@@ -344,7 +343,7 @@ int fat_block_truncate_page(struct inode *inode, loff_t
from)
static const struct address_space_operations fat_aops = {
.readpage = fat_readpage,
- .readpages = fat_readpages,
+ .readahead = fat_readahead,
.writepage = fat_writepage,
.writepages = fat_writepages,
.write_begin = fat_write_begin,
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index ba83b49ce18c..5e63c13c12c1 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -577,7 +577,7 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf,
loff_t *pos,
}
/**
- * gfs2_readpages - Read a bunch of pages at once
+ * gfs2_readahead - Read a bunch of pages at once
* @file: The file to read from
* @mapping: Address space info
* @pages: List of pages to read
@@ -590,31 +590,24 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf,
loff_t *pos,
* obviously not something we'd want to do on too regular a basis.
* Any I/O we ignore at this time will be done via readpage later.
* 2. We don't handle stuffed files here we let readpage do the honours.
- * 3. mpage_readpages() does most of the heavy lifting in the common case.
+ * 3. mpage_readahead() does most of the heavy lifting in the common case.
* 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
*/
-static int gfs2_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void gfs2_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_holder gh;
- int ret;
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (unlikely(ret))
+ if (gfs2_glock_nq(&gh))
goto out_uninit;
if (!gfs2_is_stuffed(ip))
- ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
+ mpage_readahead(rac, gfs2_block_map);
gfs2_glock_dq(&gh);
out_uninit:
gfs2_holder_uninit(&gh);
- if (unlikely(gfs2_withdrawn(sdp)))
- ret = -EIO;
- return ret;
}
/**
@@ -828,7 +821,7 @@ static const struct address_space_operations gfs2_aops = {
.writepage = gfs2_writepage,
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
- .readpages = gfs2_readpages,
+ .readahead = gfs2_readahead,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
@@ -842,7 +835,7 @@ static const struct address_space_operations gfs2_jdata_aops
= {
.writepage = gfs2_jdata_writepage,
.writepages = gfs2_jdata_writepages,
.readpage = gfs2_readpage,
- .readpages = gfs2_readpages,
+ .readahead = gfs2_readahead,
.set_page_dirty = jdata_set_page_dirty,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index b36abf9cb345..2de0d3492d15 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -125,10 +125,9 @@ static int hpfs_writepage(struct page *page, struct
writeback_control *wbc)
return block_write_full_page(page, hpfs_get_block, wbc);
}
-static int hpfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void hpfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);
+ mpage_readahead(rac, hpfs_get_block);
}
static int hpfs_writepages(struct address_space *mapping,
@@ -198,7 +197,7 @@ static int hpfs_fiemap(struct inode *inode, struct
fiemap_extent_info *fieinfo,
const struct address_space_operations hpfs_aops = {
.readpage = hpfs_readpage,
.writepage = hpfs_writepage,
- .readpages = hpfs_readpages,
+ .readahead = hpfs_readahead,
.writepages = hpfs_writepages,
.write_begin = hpfs_write_begin,
.write_end = hpfs_write_end,
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 7c84c4c027c4..cb3511eb152a 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -359,7 +359,7 @@ iomap_readpage(struct page *page, const struct iomap_ops
*ops)
}
/*
- * Just like mpage_readpages and block_read_full_page we always
+ * Just like mpage_readahead and block_read_full_page we always
* return 0 and just mark the page as PageError on errors. This
* should be cleaned up all through the stack eventually.
*/
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 62c0462dc89f..95b1f377ad09 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1185,10 +1185,9 @@ static int isofs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, isofs_get_block);
}
-static int isofs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void isofs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
+ mpage_readahead(rac, isofs_get_block);
}
static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
@@ -1198,7 +1197,7 @@ static sector_t _isofs_bmap(struct address_space *mapping,
sector_t block)
static const struct address_space_operations isofs_aops = {
.readpage = isofs_readpage,
- .readpages = isofs_readpages,
+ .readahead = isofs_readahead,
.bmap = _isofs_bmap
};
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 9486afcdac76..6f65bfa9f18d 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -296,10 +296,9 @@ static int jfs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, jfs_get_block);
}
-static int jfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void jfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
+ mpage_readahead(rac, jfs_get_block);
}
static void jfs_write_failed(struct address_space *mapping, loff_t to)
@@ -358,7 +357,7 @@ static ssize_t jfs_direct_IO(struct kiocb *iocb, struct
iov_iter *iter)
const struct address_space_operations jfs_aops = {
.readpage = jfs_readpage,
- .readpages = jfs_readpages,
+ .readahead = jfs_readahead,
.writepage = jfs_writepage,
.writepages = jfs_writepages,
.write_begin = jfs_write_begin,
diff --git a/fs/mpage.c b/fs/mpage.c
index ccba3c4c4479..8a09e6002dc2 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -91,7 +91,7 @@ mpage_alloc(struct block_device *bdev,
}
/*
- * support function for mpage_readpages. The fs supplied get_block might
+ * support function for mpage_readahead. The fs supplied get_block might
* return an up to date buffer. This is used to map that buffer into
* the page, which allows readpage to avoid triggering a duplicate call
* to get_block.
@@ -338,13 +338,8 @@ static struct bio *do_mpage_readpage(struct
mpage_readpage_args *args)
}
/**
- * mpage_readpages - populate an address space with some pages & start
reads against them
- * @mapping: the address_space
- * @pages: The address of a list_head which contains the target pages. These
- * pages have their ->index populated and are otherwise uninitialised.
- * The page at @pages->prev has the lowest file offset, and reads should
be
- * issued in @pages->prev to @pages->next order.
- * @nr_pages: The number of pages at *@pages
+ * mpage_readahead - start reads against pages
+ * @rac: Describes which pages to read.
* @get_block: The filesystem's block mapper function.
*
* This function walks the pages and the blocks within each page, building and
@@ -381,36 +376,25 @@ static struct bio *do_mpage_readpage(struct
mpage_readpage_args *args)
*
* This all causes the disk requests to be issued in the correct order.
*/
-int
-mpage_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, get_block_t get_block)
+void mpage_readahead(struct readahead_control *rac, get_block_t get_block)
{
+ struct page *page;
struct mpage_readpage_args args = {
.get_block = get_block,
.is_readahead = true,
};
- unsigned page_idx;
-
- for (page_idx = 0; page_idx < nr_pages; page_idx++) {
- struct page *page = lru_to_page(pages);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping,
- page->index,
- readahead_gfp_mask(mapping))) {
- args.page = page;
- args.nr_pages = nr_pages - page_idx;
- args.bio = do_mpage_readpage(&args);
- }
+ args.page = page;
+ args.nr_pages = readahead_count(rac);
+ args.bio = do_mpage_readpage(&args);
put_page(page);
}
- BUG_ON(!list_empty(pages));
if (args.bio)
mpage_bio_submit(REQ_OP_READ, REQ_RAHEAD, args.bio);
- return 0;
}
-EXPORT_SYMBOL(mpage_readpages);
+EXPORT_SYMBOL(mpage_readahead);
/*
* This isn't called much at all
@@ -563,7 +547,7 @@ static int __mpage_writepage(struct page *page, struct
writeback_control *wbc,
* Page has buffers, but they are all unmapped. The page was
* created by pagein or read over a hole which was handled by
* block_read_full_page(). If this address_space is also
- * using mpage_readpages then this can rarely happen.
+ * using mpage_readahead then this can rarely happen.
*/
goto confused;
}
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 671085512e0f..ceeb3b441844 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -145,18 +145,9 @@ static int nilfs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, nilfs_get_block);
}
-/**
- * nilfs_readpages() - implement readpages() method of nilfs_aops {}
- * address_space_operations.
- * @file - file struct of the file to be read
- * @mapping - address_space struct used for reading multiple pages
- * @pages - the pages to be read
- * @nr_pages - number of pages to be read
- */
-static int nilfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void nilfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
+ mpage_readahead(rac, nilfs_get_block);
}
static int nilfs_writepages(struct address_space *mapping,
@@ -308,7 +299,7 @@ const struct address_space_operations nilfs_aops = {
.readpage = nilfs_readpage,
.writepages = nilfs_writepages,
.set_page_dirty = nilfs_set_page_dirty,
- .readpages = nilfs_readpages,
+ .readahead = nilfs_readahead,
.write_begin = nilfs_write_begin,
.write_end = nilfs_write_end,
/* .releasepage = nilfs_releasepage, */
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 3a67a6518ddf..e8137efaafec 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -350,14 +350,11 @@ static int ocfs2_readpage(struct file *file, struct page
*page)
* grow out to a tree. If need be, detecting boundary extents could
* trivially be added in a future version of ocfs2_get_block().
*/
-static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ocfs2_readahead(struct readahead_control *rac)
{
- int ret, err = -EIO;
- struct inode *inode = mapping->host;
+ int ret;
+ struct inode *inode = rac->mapping->host;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- loff_t start;
- struct page *last;
/*
* Use the nonblocking flag for the dlm code to avoid page
@@ -365,36 +362,31 @@ static int ocfs2_readpages(struct file *filp, struct
address_space *mapping,
*/
ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
if (ret)
- return err;
+ return;
- if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
- ocfs2_inode_unlock(inode, 0);
- return err;
- }
+ if (down_read_trylock(&oi->ip_alloc_sem) == 0)
+ goto out_unlock;
/*
* Don't bother with inline-data. There isn't anything
* to read-ahead in that case anyway...
*/
if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
- goto out_unlock;
+ goto out_up;
/*
* Check whether a remote node truncated this file - we just
* drop out in that case as it's not worth handling here.
*/
- last = lru_to_page(pages);
- start = (loff_t)last->index << PAGE_SHIFT;
- if (start >= i_size_read(inode))
- goto out_unlock;
+ if (readahead_offset(rac) >= i_size_read(inode))
+ goto out_up;
- err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
+ mpage_readahead(rac, ocfs2_get_block);
-out_unlock:
+out_up:
up_read(&oi->ip_alloc_sem);
+out_unlock:
ocfs2_inode_unlock(inode, 0);
-
- return err;
}
/* Note: Because we don't support holes, our allocation has
@@ -2474,7 +2466,7 @@ static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct
iov_iter *iter)
const struct address_space_operations ocfs2_aops = {
.readpage = ocfs2_readpage,
- .readpages = ocfs2_readpages,
+ .readahead = ocfs2_readahead,
.writepage = ocfs2_writepage,
.write_begin = ocfs2_write_begin,
.write_end = ocfs2_write_end,
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index d640b9388238..d7b5f09d298c 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -289,10 +289,9 @@ static int omfs_readpage(struct file *file, struct page
*page)
return block_read_full_page(page, omfs_get_block);
}
-static int omfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void omfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, omfs_get_block);
+ mpage_readahead(rac, omfs_get_block);
}
static int omfs_writepage(struct page *page, struct writeback_control *wbc)
@@ -373,7 +372,7 @@ const struct inode_operations omfs_file_inops = {
const struct address_space_operations omfs_aops = {
.readpage = omfs_readpage,
- .readpages = omfs_readpages,
+ .readahead = omfs_readahead,
.writepage = omfs_writepage,
.writepages = omfs_writepages,
.write_begin = omfs_write_begin,
diff --git a/fs/qnx6/inode.c b/fs/qnx6/inode.c
index 345db56c98fd..755293c8c71a 100644
--- a/fs/qnx6/inode.c
+++ b/fs/qnx6/inode.c
@@ -99,10 +99,9 @@ static int qnx6_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, qnx6_get_block);
}
-static int qnx6_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void qnx6_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, qnx6_get_block);
+ mpage_readahead(rac, qnx6_get_block);
}
/*
@@ -499,7 +498,7 @@ static sector_t qnx6_bmap(struct address_space *mapping,
sector_t block)
}
static const struct address_space_operations qnx6_aops = {
.readpage = qnx6_readpage,
- .readpages = qnx6_readpages,
+ .readahead = qnx6_readahead,
.bmap = qnx6_bmap
};
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 6419e6dacc39..0031070b3692 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -1160,11 +1160,9 @@ int reiserfs_get_block(struct inode *inode, sector_t
block,
return retval;
}
-static int
-reiserfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void reiserfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
+ mpage_readahead(rac, reiserfs_get_block);
}
/*
@@ -3434,7 +3432,7 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr
*attr)
const struct address_space_operations reiserfs_address_space_operations = {
.writepage = reiserfs_writepage,
.readpage = reiserfs_readpage,
- .readpages = reiserfs_readpages,
+ .readahead = reiserfs_readahead,
.releasepage = reiserfs_releasepage,
.invalidatepage = reiserfs_invalidatepage,
.write_begin = reiserfs_write_begin,
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index e875bc5668ee..adaba8e8b326 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -195,10 +195,9 @@ static int udf_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, udf_get_block);
}
-static int udf_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void udf_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
+ mpage_readahead(rac, udf_get_block);
}
static int udf_write_begin(struct file *file, struct address_space *mapping,
@@ -234,7 +233,7 @@ static sector_t udf_bmap(struct address_space *mapping,
sector_t block)
const struct address_space_operations udf_aops = {
.readpage = udf_readpage,
- .readpages = udf_readpages,
+ .readahead = udf_readahead,
.writepage = udf_writepage,
.writepages = udf_writepages,
.write_begin = udf_write_begin,
diff --git a/include/linux/mpage.h b/include/linux/mpage.h
index 001f1fcf9836..f4f5e90a6844 100644
--- a/include/linux/mpage.h
+++ b/include/linux/mpage.h
@@ -13,9 +13,9 @@
#ifdef CONFIG_BLOCK
struct writeback_control;
+struct readahead_control;
-int mpage_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, get_block_t get_block);
+void mpage_readahead(struct readahead_control *, get_block_t get_block);
int mpage_readpage(struct page *page, get_block_t get_block);
int mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_block_t get_block);
diff --git a/mm/migrate.c b/mm/migrate.c
index b1092876e537..a32122095702 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1020,7 +1020,7 @@ static int __unmap_and_move(struct page *page, struct page
*newpage,
* to the LRU. Later, when the IO completes the pages are
* marked uptodate and unlocked. However, the queueing
* could be merging multiple pages for one bio (e.g.
- * mpage_readpages). If an allocation happens for the
+ * mpage_readahead). If an allocation happens for the
* second or third page, the process can end up locking
* the same page twice and deadlocking. Rather than
* trying to be clever about what pages can be locked,
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 08/19] mm: Add readahead address space operation
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
This replaces ->readpages with a saner interface:
- Return void instead of an ignored error code.
- Pages are already in the page cache when ->readahead is called.
- Implementation looks up the pages in the page cache instead of
having them passed in a linked list.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
Documentation/filesystems/locking.rst | 6 +++++-
Documentation/filesystems/vfs.rst | 13 +++++++++++++
include/linux/fs.h | 2 ++
include/linux/pagemap.h | 18 ++++++++++++++++++
mm/readahead.c | 8 +++++++-
5 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/Documentation/filesystems/locking.rst
b/Documentation/filesystems/locking.rst
index 5057e4d9dcd1..0ebc4491025a 100644
--- a/Documentation/filesystems/locking.rst
+++ b/Documentation/filesystems/locking.rst
@@ -239,6 +239,7 @@ prototypes::
int (*readpage)(struct file *, struct page *);
int (*writepages)(struct address_space *, struct writeback_control *);
int (*set_page_dirty)(struct page *page);
+ void (*readahead)(struct readahead_control *);
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
int (*write_begin)(struct file *, struct address_space *mapping,
@@ -271,7 +272,8 @@ writepage: yes, unlocks (see below)
readpage: yes, unlocks
writepages:
set_page_dirty no
-readpages:
+readahead: yes, unlocks
+readpages: no
write_begin: locks the page exclusive
write_end: yes, unlocks exclusive
bmap:
@@ -295,6 +297,8 @@ the request handler (/dev/loop).
->readpage() unlocks the page, either synchronously or via I/O
completion.
+->readahead() unlocks the pages like ->readpage().
+
->readpages() populates the pagecache with the passed pages and starts
I/O against them. They come unlocked upon I/O completion.
diff --git a/Documentation/filesystems/vfs.rst
b/Documentation/filesystems/vfs.rst
index 7d4d09dd5e6d..81ab30fbe45c 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -706,6 +706,7 @@ cache in your filesystem. The following members are
defined:
int (*readpage)(struct file *, struct page *);
int (*writepages)(struct address_space *, struct writeback_control *);
int (*set_page_dirty)(struct page *page);
+ void (*readahead)(struct readahead_control *);
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
int (*write_begin)(struct file *, struct address_space *mapping,
@@ -781,12 +782,24 @@ cache in your filesystem. The following members are
defined:
If defined, it should set the PageDirty flag, and the
PAGECACHE_TAG_DIRTY tag in the radix tree.
+``readahead``
+ Called by the VM to read pages associated with the address_space
+ object. The pages are consecutive in the page cache and are
+ locked. The implementation should decrement the page refcount
+ after starting I/O on each page. Usually the page will be
+ unlocked by the I/O completion handler. If the function does
+ not attempt I/O on some pages, the caller will decrement the page
+ refcount and unlock the pages for you. Set PageUptodate if the
+ I/O completes successfully. Setting PageError on any page will
+ be ignored; simply unlock the page if an I/O error occurs.
+
``readpages``
called by the VM to read pages associated with the address_space
object. This is essentially just a vector version of readpage.
Instead of just one page, several pages are requested.
readpages is only used for read-ahead, so read errors are
ignored. If anything goes wrong, feel free to give up.
+ This interface is deprecated; implement readahead instead.
``write_begin``
Called by the generic buffered write code to ask the filesystem
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3cd4fe6b845e..d4e2d2964346 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -292,6 +292,7 @@ enum positive_aop_returns {
struct page;
struct address_space;
struct writeback_control;
+struct readahead_control;
/*
* Write life time hint values.
@@ -375,6 +376,7 @@ struct address_space_operations {
*/
int (*readpages)(struct file *filp, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages);
+ void (*readahead)(struct readahead_control *);
int (*write_begin)(struct file *, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 3613154e79e4..bd4291f78f41 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -665,6 +665,24 @@ static inline void readahead_next(struct readahead_control
*rac)
#define readahead_for_each(rac, page) \
for (; (page = readahead_page(rac)); readahead_next(rac))
+/* The byte offset into the file of this readahead block */
+static inline loff_t readahead_offset(struct readahead_control *rac)
+{
+ return (loff_t)rac->_start * PAGE_SIZE;
+}
+
+/* The number of bytes in this readahead block */
+static inline loff_t readahead_length(struct readahead_control *rac)
+{
+ return (loff_t)rac->_nr_pages * PAGE_SIZE;
+}
+
+/* The index of the first page in this readahead block */
+static inline unsigned int readahead_index(struct readahead_control *rac)
+{
+ return rac->_start;
+}
+
/* The number of pages in this readahead block */
static inline unsigned int readahead_count(struct readahead_control *rac)
{
diff --git a/mm/readahead.c b/mm/readahead.c
index 9e430daae42f..975ff5e387be 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -121,7 +121,13 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages)
blk_start_plug(&plug);
- if (aops->readpages) {
+ if (aops->readahead) {
+ aops->readahead(rac);
+ readahead_for_each(rac, page) {
+ unlock_page(page);
+ put_page(page);
+ }
+ } else if (aops->readpages) {
aops->readpages(rac->file, rac->mapping, pages,
readahead_count(rac));
/* Clean up the remaining pages */
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 09/16] btrfs: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in btrfs. Add a
readahead_for_each_batch() iterator to optimise the loop in the XArray.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/btrfs/extent_io.c | 48 ++++++++++++++---------------------------
fs/btrfs/extent_io.h | 3 +--
fs/btrfs/inode.c | 16 ++++++--------
include/linux/pagemap.h | 27 +++++++++++++++++++++++
4 files changed, 51 insertions(+), 43 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c0f202741e09..d9f66058e0a7 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4278,52 +4278,36 @@ int extent_writepages(struct address_space *mapping,
return ret;
}
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages)
+void extent_readahead(struct readahead_control *rac)
{
struct bio *bio = NULL;
unsigned long bio_flags = 0;
struct page *pagepool[16];
struct extent_map *em_cached = NULL;
- struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
- int nr = 0;
+ struct extent_io_tree *tree =
&BTRFS_I(rac->mapping->host)->io_tree;
u64 prev_em_start = (u64)-1;
+ int nr;
- while (!list_empty(pages)) {
- u64 contig_end = 0;
-
- for (nr = 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) {
- struct page *page = lru_to_page(pages);
-
- prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping, page->index,
- readahead_gfp_mask(mapping))) {
- put_page(page);
- break;
- }
-
- pagepool[nr++] = page;
- contig_end = page_offset(page) + PAGE_SIZE - 1;
- }
-
- if (nr) {
- u64 contig_start = page_offset(pagepool[0]);
+ readahead_for_each_batch(rac, pagepool, ARRAY_SIZE(pagepool), nr) {
+ u64 contig_start = page_offset(pagepool[0]);
+ u64 contig_end = page_offset(pagepool[nr - 1]) + PAGE_SIZE - 1;
- ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
+ ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
- contiguous_readpages(tree, pagepool, nr, contig_start,
- contig_end, &em_cached, &bio, &bio_flags,
- &prev_em_start);
- }
+ contiguous_readpages(tree, pagepool, nr, contig_start,
+ contig_end, &em_cached, &bio, &bio_flags,
+ &prev_em_start);
}
if (em_cached)
free_extent_map(em_cached);
- if (bio)
- return submit_one_bio(bio, 0, bio_flags);
- return 0;
+ if (bio) {
+ int ret = submit_one_bio(bio, 0, bio_flags);
+ if (ret < 0) {
+ /* XXX: unlock the pages here? */
+ }
+ }
}
/*
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 5d205bbaafdc..bddac32948c7 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -198,8 +198,7 @@ int extent_writepages(struct address_space *mapping,
struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc);
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages);
+void extent_readahead(struct readahead_control *rac);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
void set_page_extent_mapped(struct page *page);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5b3ec93ff911..d964b2a78ed8 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4794,8 +4794,8 @@ static void evict_inode_truncate_pages(struct inode
*inode)
/*
* Keep looping until we have no more ranges in the io tree.
- * We can have ongoing bios started by readpages (called from readahead)
- * that have their endio callback (extent_io.c:end_bio_extent_readpage)
+ * We can have ongoing bios started by readahead that have
+ * their endio callback (extent_io.c:end_bio_extent_readpage)
* still in progress (unlocked the pages in the bio but did not yet
* unlocked the ranges in the io tree). Therefore this means some
* ranges can still be locked and eviction started because before
@@ -6996,11 +6996,11 @@ static int lock_extent_direct(struct inode *inode, u64
lockstart, u64 lockend,
* for it to complete) and then invalidate the pages for
* this range (through invalidate_inode_pages2_range()),
* but that can lead us to a deadlock with a concurrent
- * call to readpages() (a buffered read or a defrag call
+ * call to readahead (a buffered read or a defrag call
* triggered a readahead) on a page lock due to an
* ordered dio extent we created before but did not have
* yet a corresponding bio submitted (whence it can not
- * complete), which makes readpages() wait for that
+ * complete), which makes readahead wait for that
* ordered extent to complete while holding a lock on
* that page.
*/
@@ -8239,11 +8239,9 @@ static int btrfs_writepages(struct address_space
*mapping,
return extent_writepages(mapping, wbc);
}
-static int
-btrfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void btrfs_readahead(struct readahead_control *rac)
{
- return extent_readpages(mapping, pages, nr_pages);
+ extent_readahead(rac);
}
static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
@@ -10448,7 +10446,7 @@ static const struct address_space_operations btrfs_aops
= {
.readpage = btrfs_readpage,
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
- .readpages = btrfs_readpages,
+ .readahead = btrfs_readahead,
.direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 4f36c06d064d..1bbb60a0bf16 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -669,6 +669,33 @@ static inline void readahead_next(struct readahead_control
*rac)
#define readahead_for_each(rac, page) \
for (; (page = readahead_page(rac)); readahead_next(rac))
+static inline unsigned int readahead_page_batch(struct readahead_control *rac,
+ struct page **array, unsigned int size)
+{
+ unsigned int batch = 0;
+ XA_STATE(xas, &rac->mapping->i_pages, rac->_start);
+ struct page *page;
+
+ rac->_batch_count = 0;
+ xas_for_each(&xas, page, rac->_start + rac->_nr_pages - 1) {
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ array[batch++] = page;
+ rac->_batch_count += hpage_nr_pages(page);
+ if (PageHead(page))
+ xas_set(&xas, rac->_start + rac->_batch_count);
+
+ if (batch == size)
+ break;
+ }
+
+ return batch;
+}
+
+#define readahead_for_each_batch(rac, array, size, nr) \
+ for (; (nr = readahead_page_batch(rac, array, size)); \
+ readahead_next(rac))
+
/* The byte offset into the file of this readahead block */
static inline loff_t readahead_offset(struct readahead_control *rac)
{
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 09/19] mm: Add page_cache_readahead_limit
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
ext4 and f2fs have duplicated the guts of the readahead code so
they can read past i_size. Instead, separate out the guts of the
readahead code so they can call it directly.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/ext4/verity.c | 35 ++---------------------
fs/f2fs/verity.c | 35 ++---------------------
include/linux/pagemap.h | 4 +++
mm/readahead.c | 61 +++++++++++++++++++++++++++++------------
4 files changed, 52 insertions(+), 83 deletions(-)
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index dc5ec724d889..f6e0bf05933e 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -342,37 +342,6 @@ static int ext4_get_verity_descriptor(struct inode *inode,
void *buf,
return desc_size;
}
-/*
- * Prefetch some pages from the file's Merkle tree.
- *
- * This is basically a stripped-down version of __do_page_cache_readahead()
- * which works on pages past i_size.
- */
-static void ext4_merkle_tree_readahead(struct address_space *mapping,
- pgoff_t start_index, unsigned long count)
-{
- LIST_HEAD(pages);
- unsigned int nr_pages = 0;
- struct page *page;
- pgoff_t index;
- struct blk_plug plug;
-
- for (index = start_index; index < start_index + count; index++) {
- page = xa_load(&mapping->i_pages, index);
- if (!page || xa_is_value(page)) {
- page = __page_cache_alloc(readahead_gfp_mask(mapping));
- if (!page)
- break;
- page->index = index;
- list_add(&page->lru, &pages);
- nr_pages++;
- }
- }
- blk_start_plug(&plug);
- ext4_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
- blk_finish_plug(&plug);
-}
-
static struct page *ext4_read_merkle_tree_page(struct inode *inode,
pgoff_t index,
unsigned long num_ra_pages)
@@ -386,8 +355,8 @@ static struct page *ext4_read_merkle_tree_page(struct inode
*inode,
if (page)
put_page(page);
else if (num_ra_pages > 1)
- ext4_merkle_tree_readahead(inode->i_mapping, index,
- num_ra_pages);
+ page_cache_readahead_limit(inode->i_mapping, NULL,
+ index, LONG_MAX, num_ra_pages, 0);
page = read_mapping_page(inode->i_mapping, index, NULL);
}
return page;
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index d7d430a6f130..71a3e36721fa 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -222,37 +222,6 @@ static int f2fs_get_verity_descriptor(struct inode *inode,
void *buf,
return size;
}
-/*
- * Prefetch some pages from the file's Merkle tree.
- *
- * This is basically a stripped-down version of __do_page_cache_readahead()
- * which works on pages past i_size.
- */
-static void f2fs_merkle_tree_readahead(struct address_space *mapping,
- pgoff_t start_index, unsigned long count)
-{
- LIST_HEAD(pages);
- unsigned int nr_pages = 0;
- struct page *page;
- pgoff_t index;
- struct blk_plug plug;
-
- for (index = start_index; index < start_index + count; index++) {
- page = xa_load(&mapping->i_pages, index);
- if (!page || xa_is_value(page)) {
- page = __page_cache_alloc(readahead_gfp_mask(mapping));
- if (!page)
- break;
- page->index = index;
- list_add(&page->lru, &pages);
- nr_pages++;
- }
- }
- blk_start_plug(&plug);
- f2fs_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
- blk_finish_plug(&plug);
-}
-
static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
pgoff_t index,
unsigned long num_ra_pages)
@@ -266,8 +235,8 @@ static struct page *f2fs_read_merkle_tree_page(struct inode
*inode,
if (page)
put_page(page);
else if (num_ra_pages > 1)
- f2fs_merkle_tree_readahead(inode->i_mapping, index,
- num_ra_pages);
+ page_cache_readahead_limit(inode->i_mapping, NULL,
+ index, LONG_MAX, num_ra_pages, 0);
page = read_mapping_page(inode->i_mapping, index, NULL);
}
return page;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index bd4291f78f41..4f36c06d064d 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -389,6 +389,10 @@ extern struct page * read_cache_page_gfp(struct
address_space *mapping,
pgoff_t index, gfp_t gfp_mask);
extern int read_cache_pages(struct address_space *mapping,
struct list_head *pages, filler_t *filler, void *data);
+void page_cache_readahead_limit(struct address_space *mapping,
+ struct file *file, pgoff_t offset, pgoff_t end_index,
+ unsigned long nr_to_read, unsigned long lookahead_size);
+
static inline struct page *read_mapping_page(struct address_space *mapping,
pgoff_t index, void *data)
diff --git a/mm/readahead.c b/mm/readahead.c
index 975ff5e387be..94d499cfb657 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -142,35 +142,38 @@ static void read_pages(struct readahead_control *rac,
struct list_head *pages)
blk_finish_plug(&plug);
}
-/*
- * __do_page_cache_readahead() actually reads a chunk of disk. It allocates
- * the pages first, then submits them for I/O. This avoids the very bad
- * behaviour which would occur if page allocations are causing VM writeback.
- * We really don't want to intermingle reads and writes like that.
+/**
+ * page_cache_readahead_limit - Start readahead beyond a file's i_size.
+ * @mapping: File address space.
+ * @file: This instance of the open file; used for authentication.
+ * @offset: First page index to read.
+ * @end_index: The maximum page index to read.
+ * @nr_to_read: The number of pages to read.
+ * @lookahead_size: Where to start the next readahead.
+ *
+ * This function is for filesystems to call when they want to start
+ * readahead potentially beyond a file's stated i_size. If you want
+ * to start readahead on a normal file, you probably want to call
+ * page_cache_async_readahead() or page_cache_sync_readahead() instead.
+ *
+ * Context: File is referenced by caller. Mutexes may be held by caller.
+ * May sleep, but will not reenter filesystem to reclaim memory.
*/
-void __do_page_cache_readahead(struct address_space *mapping,
- struct file *filp, pgoff_t offset, unsigned long nr_to_read,
- unsigned long lookahead_size)
+void page_cache_readahead_limit(struct address_space *mapping,
+ struct file *file, pgoff_t offset, pgoff_t end_index,
+ unsigned long nr_to_read, unsigned long lookahead_size)
{
- struct inode *inode = mapping->host;
- unsigned long end_index; /* The last page we want to read */
LIST_HEAD(page_pool);
unsigned long i;
- loff_t isize = i_size_read(inode);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
bool use_list = mapping->a_ops->readpages;
struct readahead_control rac = {
.mapping = mapping,
- .file = filp,
+ .file = file,
._start = offset,
._nr_pages = 0,
};
- if (isize == 0)
- return;
-
- end_index = ((isize - 1) >> PAGE_SHIFT);
-
/*
* Preallocate as many pages as we will need.
*/
@@ -225,6 +228,30 @@ void __do_page_cache_readahead(struct address_space
*mapping,
read_pages(&rac, &page_pool);
BUG_ON(!list_empty(&page_pool));
}
+EXPORT_SYMBOL_GPL(page_cache_readahead_limit);
+
+/*
+ * __do_page_cache_readahead() actually reads a chunk of disk. It allocates
+ * the pages first, then submits them for I/O. This avoids the very bad
+ * behaviour which would occur if page allocations are causing VM writeback.
+ * We really don't want to intermingle reads and writes like that.
+ */
+void __do_page_cache_readahead(struct address_space *mapping,
+ struct file *file, pgoff_t offset, unsigned long nr_to_read,
+ unsigned long lookahead_size)
+{
+ struct inode *inode = mapping->host;
+ unsigned long end_index; /* The last page we want to read */
+ loff_t isize = i_size_read(inode);
+
+ if (isize == 0)
+ return;
+
+ end_index = ((isize - 1) >> PAGE_SHIFT);
+
+ page_cache_readahead_limit(mapping, file, offset, end_index,
+ nr_to_read, lookahead_size);
+}
/*
* Chunk the readahead into 2 megabyte units, so that we don't pin too much
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 10/16] erofs: Convert uncompressed files from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in erofs
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/erofs/data.c | 39 +++++++++++++-----------------------
fs/erofs/zdata.c | 2 +-
include/trace/events/erofs.h | 6 +++---
3 files changed, 18 insertions(+), 29 deletions(-)
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index fc3a8d8064f8..82ebcee9d178 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -280,47 +280,36 @@ static int erofs_raw_access_readpage(struct file *file,
struct page *page)
return 0;
}
-static int erofs_raw_access_readpages(struct file *filp,
- struct address_space *mapping,
- struct list_head *pages,
- unsigned int nr_pages)
+static void erofs_raw_access_readahead(struct readahead_control *rac)
{
erofs_off_t last_block;
struct bio *bio = NULL;
- gfp_t gfp = readahead_gfp_mask(mapping);
- struct page *page = list_last_entry(pages, struct page, lru);
-
- trace_erofs_readpages(mapping->host, page, nr_pages, true);
+ struct page *page;
- for (; nr_pages; --nr_pages) {
- page = list_entry(pages->prev, struct page, lru);
+ trace_erofs_readpages(rac->mapping->host, readahead_index(rac),
+ readahead_count(rac), true);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping, page->index, gfp)) {
- bio = erofs_read_raw_page(bio, mapping, page,
- &last_block, nr_pages, true);
+ bio = erofs_read_raw_page(bio, rac->mapping, page, &last_block,
+ readahead_count(rac), true);
- /* all the page errors are ignored when readahead */
- if (IS_ERR(bio)) {
- pr_err("%s, readahead error at page %lu of nid %llu\n",
- __func__, page->index,
- EROFS_I(mapping->host)->nid);
+ /* all the page errors are ignored when readahead */
+ if (IS_ERR(bio)) {
+ pr_err("%s, readahead error at page %lu of nid %llu\n",
+ __func__, page->index,
+ EROFS_I(rac->mapping->host)->nid);
- bio = NULL;
- }
+ bio = NULL;
}
- /* pages could still be locked */
put_page(page);
}
- DBG_BUGON(!list_empty(pages));
/* the rare case (end in gaps) */
if (bio)
submit_bio(bio);
- return 0;
}
static int erofs_get_block(struct inode *inode, sector_t iblock,
@@ -358,7 +347,7 @@ static sector_t erofs_bmap(struct address_space *mapping,
sector_t block)
/* for uncompressed (aligned) files and raw access for other files */
const struct address_space_operations erofs_raw_access_aops = {
.readpage = erofs_raw_access_readpage,
- .readpages = erofs_raw_access_readpages,
+ .readahead = erofs_raw_access_readahead,
.bmap = erofs_bmap,
};
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 80e47f07d946..17f45fcb8c5c 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1315,7 +1315,7 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
struct page *head = NULL;
LIST_HEAD(pagepool);
- trace_erofs_readpages(mapping->host, lru_to_page(pages),
+ trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
nr_pages, false);
f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
diff --git a/include/trace/events/erofs.h b/include/trace/events/erofs.h
index 27f5caa6299a..bf9806fd1306 100644
--- a/include/trace/events/erofs.h
+++ b/include/trace/events/erofs.h
@@ -113,10 +113,10 @@ TRACE_EVENT(erofs_readpage,
TRACE_EVENT(erofs_readpages,
- TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage,
+ TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage,
bool raw),
- TP_ARGS(inode, page, nrpage, raw),
+ TP_ARGS(inode, start, nrpage, raw),
TP_STRUCT__entry(
__field(dev_t, dev )
@@ -129,7 +129,7 @@ TRACE_EVENT(erofs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->nid = EROFS_I(inode)->nid;
- __entry->start = page->index;
+ __entry->start = start;
__entry->nrpage = nrpage;
__entry->raw = raw;
),
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 10/19] fs: Convert mpage_readpages to mpage_readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Implement the new readahead aop and convert all callers (block_dev,
exfat, ext2, fat, gfs2, hpfs, isofs, jfs, nilfs2, ocfs2, omfs, qnx6,
reiserfs & udf). The callers are all trivial except for GFS2 & OCFS2.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Reviewed-by: Junxiao Bi <junxiao.bi at oracle.com> # ocfs2
---
drivers/staging/exfat/exfat_super.c | 7 +++---
fs/block_dev.c | 7 +++---
fs/ext2/inode.c | 10 +++-----
fs/fat/inode.c | 7 +++---
fs/gfs2/aops.c | 23 ++++++-----------
fs/hpfs/file.c | 7 +++---
fs/iomap/buffered-io.c | 2 +-
fs/isofs/inode.c | 7 +++---
fs/jfs/inode.c | 7 +++---
fs/mpage.c | 38 +++++++++--------------------
fs/nilfs2/inode.c | 15 +++---------
fs/ocfs2/aops.c | 34 ++++++++++----------------
fs/omfs/file.c | 7 +++---
fs/qnx6/inode.c | 7 +++---
fs/reiserfs/inode.c | 8 +++---
fs/udf/inode.c | 7 +++---
include/linux/mpage.h | 4 +--
mm/migrate.c | 2 +-
18 files changed, 73 insertions(+), 126 deletions(-)
diff --git a/drivers/staging/exfat/exfat_super.c
b/drivers/staging/exfat/exfat_super.c
index b81d2a87b82e..96aad9b16d31 100644
--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -3002,10 +3002,9 @@ static int exfat_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, exfat_get_block);
}
-static int exfat_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void exfat_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
+ mpage_readahead(rac, exfat_get_block);
}
static int exfat_writepage(struct page *page, struct writeback_control *wbc)
@@ -3104,7 +3103,7 @@ static sector_t _exfat_bmap(struct address_space *mapping,
sector_t block)
static const struct address_space_operations exfat_aops = {
.readpage = exfat_readpage,
- .readpages = exfat_readpages,
+ .readahead = exfat_readahead,
.writepage = exfat_writepage,
.writepages = exfat_writepages,
.write_begin = exfat_write_begin,
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69bf2fb6f7cd..2fd9c7bd61f6 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -614,10 +614,9 @@ static int blkdev_readpage(struct file * file, struct page
* page)
return block_read_full_page(page, blkdev_get_block);
}
-static int blkdev_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void blkdev_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block);
+ mpage_readahead(rac, blkdev_get_block);
}
static int blkdev_write_begin(struct file *file, struct address_space *mapping,
@@ -2062,7 +2061,7 @@ static int blkdev_writepages(struct address_space
*mapping,
static const struct address_space_operations def_blk_aops = {
.readpage = blkdev_readpage,
- .readpages = blkdev_readpages,
+ .readahead = blkdev_readahead,
.writepage = blkdev_writepage,
.write_begin = blkdev_write_begin,
.write_end = blkdev_write_end,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index c885cf7d724b..2875c0a705b5 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -877,11 +877,9 @@ static int ext2_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, ext2_get_block);
}
-static int
-ext2_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ext2_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, ext2_get_block);
+ mpage_readahead(rac, ext2_get_block);
}
static int
@@ -967,7 +965,7 @@ ext2_dax_writepages(struct address_space *mapping, struct
writeback_control *wbc
const struct address_space_operations ext2_aops = {
.readpage = ext2_readpage,
- .readpages = ext2_readpages,
+ .readahead = ext2_readahead,
.writepage = ext2_writepage,
.write_begin = ext2_write_begin,
.write_end = ext2_write_end,
@@ -981,7 +979,7 @@ const struct address_space_operations ext2_aops = {
const struct address_space_operations ext2_nobh_aops = {
.readpage = ext2_readpage,
- .readpages = ext2_readpages,
+ .readahead = ext2_readahead,
.writepage = ext2_nobh_writepage,
.write_begin = ext2_nobh_write_begin,
.write_end = nobh_write_end,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 594b05ae16c9..3496f5fc3e6d 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -210,10 +210,9 @@ static int fat_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, fat_get_block);
}
-static int fat_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void fat_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, fat_get_block);
+ mpage_readahead(rac, fat_get_block);
}
static void fat_write_failed(struct address_space *mapping, loff_t to)
@@ -344,7 +343,7 @@ int fat_block_truncate_page(struct inode *inode, loff_t
from)
static const struct address_space_operations fat_aops = {
.readpage = fat_readpage,
- .readpages = fat_readpages,
+ .readahead = fat_readahead,
.writepage = fat_writepage,
.writepages = fat_writepages,
.write_begin = fat_write_begin,
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index ba83b49ce18c..5e63c13c12c1 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -577,7 +577,7 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf,
loff_t *pos,
}
/**
- * gfs2_readpages - Read a bunch of pages at once
+ * gfs2_readahead - Read a bunch of pages at once
* @file: The file to read from
* @mapping: Address space info
* @pages: List of pages to read
@@ -590,31 +590,24 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf,
loff_t *pos,
* obviously not something we'd want to do on too regular a basis.
* Any I/O we ignore at this time will be done via readpage later.
* 2. We don't handle stuffed files here we let readpage do the honours.
- * 3. mpage_readpages() does most of the heavy lifting in the common case.
+ * 3. mpage_readahead() does most of the heavy lifting in the common case.
* 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
*/
-static int gfs2_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void gfs2_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_holder gh;
- int ret;
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
- ret = gfs2_glock_nq(&gh);
- if (unlikely(ret))
+ if (gfs2_glock_nq(&gh))
goto out_uninit;
if (!gfs2_is_stuffed(ip))
- ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
+ mpage_readahead(rac, gfs2_block_map);
gfs2_glock_dq(&gh);
out_uninit:
gfs2_holder_uninit(&gh);
- if (unlikely(gfs2_withdrawn(sdp)))
- ret = -EIO;
- return ret;
}
/**
@@ -828,7 +821,7 @@ static const struct address_space_operations gfs2_aops = {
.writepage = gfs2_writepage,
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
- .readpages = gfs2_readpages,
+ .readahead = gfs2_readahead,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
@@ -842,7 +835,7 @@ static const struct address_space_operations gfs2_jdata_aops
= {
.writepage = gfs2_jdata_writepage,
.writepages = gfs2_jdata_writepages,
.readpage = gfs2_readpage,
- .readpages = gfs2_readpages,
+ .readahead = gfs2_readahead,
.set_page_dirty = jdata_set_page_dirty,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index b36abf9cb345..2de0d3492d15 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -125,10 +125,9 @@ static int hpfs_writepage(struct page *page, struct
writeback_control *wbc)
return block_write_full_page(page, hpfs_get_block, wbc);
}
-static int hpfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void hpfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);
+ mpage_readahead(rac, hpfs_get_block);
}
static int hpfs_writepages(struct address_space *mapping,
@@ -198,7 +197,7 @@ static int hpfs_fiemap(struct inode *inode, struct
fiemap_extent_info *fieinfo,
const struct address_space_operations hpfs_aops = {
.readpage = hpfs_readpage,
.writepage = hpfs_writepage,
- .readpages = hpfs_readpages,
+ .readahead = hpfs_readahead,
.writepages = hpfs_writepages,
.write_begin = hpfs_write_begin,
.write_end = hpfs_write_end,
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 7c84c4c027c4..cb3511eb152a 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -359,7 +359,7 @@ iomap_readpage(struct page *page, const struct iomap_ops
*ops)
}
/*
- * Just like mpage_readpages and block_read_full_page we always
+ * Just like mpage_readahead and block_read_full_page we always
* return 0 and just mark the page as PageError on errors. This
* should be cleaned up all through the stack eventually.
*/
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 62c0462dc89f..95b1f377ad09 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1185,10 +1185,9 @@ static int isofs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, isofs_get_block);
}
-static int isofs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void isofs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
+ mpage_readahead(rac, isofs_get_block);
}
static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
@@ -1198,7 +1197,7 @@ static sector_t _isofs_bmap(struct address_space *mapping,
sector_t block)
static const struct address_space_operations isofs_aops = {
.readpage = isofs_readpage,
- .readpages = isofs_readpages,
+ .readahead = isofs_readahead,
.bmap = _isofs_bmap
};
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 9486afcdac76..6f65bfa9f18d 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -296,10 +296,9 @@ static int jfs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, jfs_get_block);
}
-static int jfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void jfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
+ mpage_readahead(rac, jfs_get_block);
}
static void jfs_write_failed(struct address_space *mapping, loff_t to)
@@ -358,7 +357,7 @@ static ssize_t jfs_direct_IO(struct kiocb *iocb, struct
iov_iter *iter)
const struct address_space_operations jfs_aops = {
.readpage = jfs_readpage,
- .readpages = jfs_readpages,
+ .readahead = jfs_readahead,
.writepage = jfs_writepage,
.writepages = jfs_writepages,
.write_begin = jfs_write_begin,
diff --git a/fs/mpage.c b/fs/mpage.c
index ccba3c4c4479..8a09e6002dc2 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -91,7 +91,7 @@ mpage_alloc(struct block_device *bdev,
}
/*
- * support function for mpage_readpages. The fs supplied get_block might
+ * support function for mpage_readahead. The fs supplied get_block might
* return an up to date buffer. This is used to map that buffer into
* the page, which allows readpage to avoid triggering a duplicate call
* to get_block.
@@ -338,13 +338,8 @@ static struct bio *do_mpage_readpage(struct
mpage_readpage_args *args)
}
/**
- * mpage_readpages - populate an address space with some pages & start
reads against them
- * @mapping: the address_space
- * @pages: The address of a list_head which contains the target pages. These
- * pages have their ->index populated and are otherwise uninitialised.
- * The page at @pages->prev has the lowest file offset, and reads should
be
- * issued in @pages->prev to @pages->next order.
- * @nr_pages: The number of pages at *@pages
+ * mpage_readahead - start reads against pages
+ * @rac: Describes which pages to read.
* @get_block: The filesystem's block mapper function.
*
* This function walks the pages and the blocks within each page, building and
@@ -381,36 +376,25 @@ static struct bio *do_mpage_readpage(struct
mpage_readpage_args *args)
*
* This all causes the disk requests to be issued in the correct order.
*/
-int
-mpage_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, get_block_t get_block)
+void mpage_readahead(struct readahead_control *rac, get_block_t get_block)
{
+ struct page *page;
struct mpage_readpage_args args = {
.get_block = get_block,
.is_readahead = true,
};
- unsigned page_idx;
-
- for (page_idx = 0; page_idx < nr_pages; page_idx++) {
- struct page *page = lru_to_page(pages);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping,
- page->index,
- readahead_gfp_mask(mapping))) {
- args.page = page;
- args.nr_pages = nr_pages - page_idx;
- args.bio = do_mpage_readpage(&args);
- }
+ args.page = page;
+ args.nr_pages = readahead_count(rac);
+ args.bio = do_mpage_readpage(&args);
put_page(page);
}
- BUG_ON(!list_empty(pages));
if (args.bio)
mpage_bio_submit(REQ_OP_READ, REQ_RAHEAD, args.bio);
- return 0;
}
-EXPORT_SYMBOL(mpage_readpages);
+EXPORT_SYMBOL(mpage_readahead);
/*
* This isn't called much at all
@@ -563,7 +547,7 @@ static int __mpage_writepage(struct page *page, struct
writeback_control *wbc,
* Page has buffers, but they are all unmapped. The page was
* created by pagein or read over a hole which was handled by
* block_read_full_page(). If this address_space is also
- * using mpage_readpages then this can rarely happen.
+ * using mpage_readahead then this can rarely happen.
*/
goto confused;
}
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 671085512e0f..ceeb3b441844 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -145,18 +145,9 @@ static int nilfs_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, nilfs_get_block);
}
-/**
- * nilfs_readpages() - implement readpages() method of nilfs_aops {}
- * address_space_operations.
- * @file - file struct of the file to be read
- * @mapping - address_space struct used for reading multiple pages
- * @pages - the pages to be read
- * @nr_pages - number of pages to be read
- */
-static int nilfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void nilfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
+ mpage_readahead(rac, nilfs_get_block);
}
static int nilfs_writepages(struct address_space *mapping,
@@ -308,7 +299,7 @@ const struct address_space_operations nilfs_aops = {
.readpage = nilfs_readpage,
.writepages = nilfs_writepages,
.set_page_dirty = nilfs_set_page_dirty,
- .readpages = nilfs_readpages,
+ .readahead = nilfs_readahead,
.write_begin = nilfs_write_begin,
.write_end = nilfs_write_end,
/* .releasepage = nilfs_releasepage, */
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 3a67a6518ddf..e8137efaafec 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -350,14 +350,11 @@ static int ocfs2_readpage(struct file *file, struct page
*page)
* grow out to a tree. If need be, detecting boundary extents could
* trivially be added in a future version of ocfs2_get_block().
*/
-static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ocfs2_readahead(struct readahead_control *rac)
{
- int ret, err = -EIO;
- struct inode *inode = mapping->host;
+ int ret;
+ struct inode *inode = rac->mapping->host;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- loff_t start;
- struct page *last;
/*
* Use the nonblocking flag for the dlm code to avoid page
@@ -365,36 +362,31 @@ static int ocfs2_readpages(struct file *filp, struct
address_space *mapping,
*/
ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
if (ret)
- return err;
+ return;
- if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
- ocfs2_inode_unlock(inode, 0);
- return err;
- }
+ if (down_read_trylock(&oi->ip_alloc_sem) == 0)
+ goto out_unlock;
/*
* Don't bother with inline-data. There isn't anything
* to read-ahead in that case anyway...
*/
if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
- goto out_unlock;
+ goto out_up;
/*
* Check whether a remote node truncated this file - we just
* drop out in that case as it's not worth handling here.
*/
- last = lru_to_page(pages);
- start = (loff_t)last->index << PAGE_SHIFT;
- if (start >= i_size_read(inode))
- goto out_unlock;
+ if (readahead_offset(rac) >= i_size_read(inode))
+ goto out_up;
- err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
+ mpage_readahead(rac, ocfs2_get_block);
-out_unlock:
+out_up:
up_read(&oi->ip_alloc_sem);
+out_unlock:
ocfs2_inode_unlock(inode, 0);
-
- return err;
}
/* Note: Because we don't support holes, our allocation has
@@ -2474,7 +2466,7 @@ static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct
iov_iter *iter)
const struct address_space_operations ocfs2_aops = {
.readpage = ocfs2_readpage,
- .readpages = ocfs2_readpages,
+ .readahead = ocfs2_readahead,
.writepage = ocfs2_writepage,
.write_begin = ocfs2_write_begin,
.write_end = ocfs2_write_end,
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index d640b9388238..d7b5f09d298c 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -289,10 +289,9 @@ static int omfs_readpage(struct file *file, struct page
*page)
return block_read_full_page(page, omfs_get_block);
}
-static int omfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void omfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, omfs_get_block);
+ mpage_readahead(rac, omfs_get_block);
}
static int omfs_writepage(struct page *page, struct writeback_control *wbc)
@@ -373,7 +372,7 @@ const struct inode_operations omfs_file_inops = {
const struct address_space_operations omfs_aops = {
.readpage = omfs_readpage,
- .readpages = omfs_readpages,
+ .readahead = omfs_readahead,
.writepage = omfs_writepage,
.writepages = omfs_writepages,
.write_begin = omfs_write_begin,
diff --git a/fs/qnx6/inode.c b/fs/qnx6/inode.c
index 345db56c98fd..755293c8c71a 100644
--- a/fs/qnx6/inode.c
+++ b/fs/qnx6/inode.c
@@ -99,10 +99,9 @@ static int qnx6_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, qnx6_get_block);
}
-static int qnx6_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void qnx6_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, qnx6_get_block);
+ mpage_readahead(rac, qnx6_get_block);
}
/*
@@ -499,7 +498,7 @@ static sector_t qnx6_bmap(struct address_space *mapping,
sector_t block)
}
static const struct address_space_operations qnx6_aops = {
.readpage = qnx6_readpage,
- .readpages = qnx6_readpages,
+ .readahead = qnx6_readahead,
.bmap = qnx6_bmap
};
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 6419e6dacc39..0031070b3692 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -1160,11 +1160,9 @@ int reiserfs_get_block(struct inode *inode, sector_t
block,
return retval;
}
-static int
-reiserfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void reiserfs_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
+ mpage_readahead(rac, reiserfs_get_block);
}
/*
@@ -3434,7 +3432,7 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr
*attr)
const struct address_space_operations reiserfs_address_space_operations = {
.writepage = reiserfs_writepage,
.readpage = reiserfs_readpage,
- .readpages = reiserfs_readpages,
+ .readahead = reiserfs_readahead,
.releasepage = reiserfs_releasepage,
.invalidatepage = reiserfs_invalidatepage,
.write_begin = reiserfs_write_begin,
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index e875bc5668ee..adaba8e8b326 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -195,10 +195,9 @@ static int udf_readpage(struct file *file, struct page
*page)
return mpage_readpage(page, udf_get_block);
}
-static int udf_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void udf_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
+ mpage_readahead(rac, udf_get_block);
}
static int udf_write_begin(struct file *file, struct address_space *mapping,
@@ -234,7 +233,7 @@ static sector_t udf_bmap(struct address_space *mapping,
sector_t block)
const struct address_space_operations udf_aops = {
.readpage = udf_readpage,
- .readpages = udf_readpages,
+ .readahead = udf_readahead,
.writepage = udf_writepage,
.writepages = udf_writepages,
.write_begin = udf_write_begin,
diff --git a/include/linux/mpage.h b/include/linux/mpage.h
index 001f1fcf9836..f4f5e90a6844 100644
--- a/include/linux/mpage.h
+++ b/include/linux/mpage.h
@@ -13,9 +13,9 @@
#ifdef CONFIG_BLOCK
struct writeback_control;
+struct readahead_control;
-int mpage_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, get_block_t get_block);
+void mpage_readahead(struct readahead_control *, get_block_t get_block);
int mpage_readpage(struct page *page, get_block_t get_block);
int mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_block_t get_block);
diff --git a/mm/migrate.c b/mm/migrate.c
index b1092876e537..a32122095702 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1020,7 +1020,7 @@ static int __unmap_and_move(struct page *page, struct page
*newpage,
* to the LRU. Later, when the IO completes the pages are
* marked uptodate and unlocked. However, the queueing
* could be merging multiple pages for one bio (e.g.
- * mpage_readpages). If an allocation happens for the
+ * mpage_readahead). If an allocation happens for the
* second or third page, the process can end up locking
* the same page twice and deadlocking. Rather than
* trying to be clever about what pages can be locked,
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:45 UTC
[Ocfs2-devel] [PATCH v6 11/19] btrfs: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in btrfs. Add a
readahead_for_each_batch() iterator to optimise the loop in the XArray.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/btrfs/extent_io.c | 46 +++++++++++++----------------------------
fs/btrfs/extent_io.h | 3 +--
fs/btrfs/inode.c | 16 +++++++-------
include/linux/pagemap.h | 27 ++++++++++++++++++++++++
4 files changed, 49 insertions(+), 43 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c0f202741e09..e97a6acd6f5d 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4278,52 +4278,34 @@ int extent_writepages(struct address_space *mapping,
return ret;
}
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages)
+void extent_readahead(struct readahead_control *rac)
{
struct bio *bio = NULL;
unsigned long bio_flags = 0;
struct page *pagepool[16];
struct extent_map *em_cached = NULL;
- struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
- int nr = 0;
+ struct extent_io_tree *tree =
&BTRFS_I(rac->mapping->host)->io_tree;
u64 prev_em_start = (u64)-1;
+ int nr;
- while (!list_empty(pages)) {
- u64 contig_end = 0;
-
- for (nr = 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) {
- struct page *page = lru_to_page(pages);
-
- prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping, page->index,
- readahead_gfp_mask(mapping))) {
- put_page(page);
- break;
- }
-
- pagepool[nr++] = page;
- contig_end = page_offset(page) + PAGE_SIZE - 1;
- }
+ readahead_for_each_batch(rac, pagepool, ARRAY_SIZE(pagepool), nr) {
+ u64 contig_start = page_offset(pagepool[0]);
+ u64 contig_end = page_offset(pagepool[nr - 1]) + PAGE_SIZE - 1;
- if (nr) {
- u64 contig_start = page_offset(pagepool[0]);
+ ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
- ASSERT(contig_start + nr * PAGE_SIZE - 1 == contig_end);
-
- contiguous_readpages(tree, pagepool, nr, contig_start,
- contig_end, &em_cached, &bio, &bio_flags,
- &prev_em_start);
- }
+ contiguous_readpages(tree, pagepool, nr, contig_start,
+ contig_end, &em_cached, &bio, &bio_flags,
+ &prev_em_start);
}
if (em_cached)
free_extent_map(em_cached);
- if (bio)
- return submit_one_bio(bio, 0, bio_flags);
- return 0;
+ if (bio) {
+ if (submit_one_bio(bio, 0, bio_flags))
+ return;
+ }
}
/*
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 5d205bbaafdc..bddac32948c7 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -198,8 +198,7 @@ int extent_writepages(struct address_space *mapping,
struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc);
-int extent_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages);
+void extent_readahead(struct readahead_control *rac);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
void set_page_extent_mapped(struct page *page);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7d26b4bfb2c6..61d5137ce4e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4802,8 +4802,8 @@ static void evict_inode_truncate_pages(struct inode
*inode)
/*
* Keep looping until we have no more ranges in the io tree.
- * We can have ongoing bios started by readpages (called from readahead)
- * that have their endio callback (extent_io.c:end_bio_extent_readpage)
+ * We can have ongoing bios started by readahead that have
+ * their endio callback (extent_io.c:end_bio_extent_readpage)
* still in progress (unlocked the pages in the bio but did not yet
* unlocked the ranges in the io tree). Therefore this means some
* ranges can still be locked and eviction started because before
@@ -7004,11 +7004,11 @@ static int lock_extent_direct(struct inode *inode, u64
lockstart, u64 lockend,
* for it to complete) and then invalidate the pages for
* this range (through invalidate_inode_pages2_range()),
* but that can lead us to a deadlock with a concurrent
- * call to readpages() (a buffered read or a defrag call
+ * call to readahead (a buffered read or a defrag call
* triggered a readahead) on a page lock due to an
* ordered dio extent we created before but did not have
* yet a corresponding bio submitted (whence it can not
- * complete), which makes readpages() wait for that
+ * complete), which makes readahead wait for that
* ordered extent to complete while holding a lock on
* that page.
*/
@@ -8247,11 +8247,9 @@ static int btrfs_writepages(struct address_space
*mapping,
return extent_writepages(mapping, wbc);
}
-static int
-btrfs_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void btrfs_readahead(struct readahead_control *rac)
{
- return extent_readpages(mapping, pages, nr_pages);
+ extent_readahead(rac);
}
static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
@@ -10456,7 +10454,7 @@ static const struct address_space_operations btrfs_aops
= {
.readpage = btrfs_readpage,
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
- .readpages = btrfs_readpages,
+ .readahead = btrfs_readahead,
.direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 4f36c06d064d..1bbb60a0bf16 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -669,6 +669,33 @@ static inline void readahead_next(struct readahead_control
*rac)
#define readahead_for_each(rac, page) \
for (; (page = readahead_page(rac)); readahead_next(rac))
+static inline unsigned int readahead_page_batch(struct readahead_control *rac,
+ struct page **array, unsigned int size)
+{
+ unsigned int batch = 0;
+ XA_STATE(xas, &rac->mapping->i_pages, rac->_start);
+ struct page *page;
+
+ rac->_batch_count = 0;
+ xas_for_each(&xas, page, rac->_start + rac->_nr_pages - 1) {
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ array[batch++] = page;
+ rac->_batch_count += hpage_nr_pages(page);
+ if (PageHead(page))
+ xas_set(&xas, rac->_start + rac->_batch_count);
+
+ if (batch == size)
+ break;
+ }
+
+ return batch;
+}
+
+#define readahead_for_each_batch(rac, array, size, nr) \
+ for (; (nr = readahead_page_batch(rac, array, size)); \
+ readahead_next(rac))
+
/* The byte offset into the file of this readahead block */
static inline loff_t readahead_offset(struct readahead_control *rac)
{
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 11/16] erofs: Convert compressed files from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in erofs.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/erofs/zdata.c | 29 +++++++++--------------------
1 file changed, 9 insertions(+), 20 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 17f45fcb8c5c..7c02015d501d 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1303,28 +1303,23 @@ static bool should_decompress_synchronously(struct
erofs_sb_info *sbi,
return nr <= sbi->max_sync_decompress_pages;
}
-static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void z_erofs_readahead(struct readahead_control *rac)
{
- struct inode *const inode = mapping->host;
+ struct inode *const inode = rac->mapping->host;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
- bool sync = should_decompress_synchronously(sbi, nr_pages);
+ bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
- gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
- struct page *head = NULL;
+ struct page *page, *head = NULL;
LIST_HEAD(pagepool);
- trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
- nr_pages, false);
+ trace_erofs_readpages(inode, readahead_index(rac),
+ readahead_count(rac), false);
- f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
-
- for (; nr_pages; --nr_pages) {
- struct page *page = lru_to_page(pages);
+ f.headoffset = readahead_offset(rac);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
/*
* A pure asynchronous readahead is indicated if
@@ -1333,11 +1328,6 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
*/
sync &= !(PageReadahead(page) && !head);
- if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
- list_add(&page->lru, &pagepool);
- continue;
- }
-
set_page_private(page, (unsigned long)head);
head = page;
}
@@ -1366,11 +1356,10 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
/* clean up the remaining free pages */
put_pages_list(&pagepool);
- return 0;
}
const struct address_space_operations z_erofs_aops = {
.readpage = z_erofs_readpage,
- .readpages = z_erofs_readpages,
+ .readahead = z_erofs_readahead,
};
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 12/19] erofs: Convert uncompressed files from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in erofs
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/erofs/data.c | 39 +++++++++++++-----------------------
fs/erofs/zdata.c | 2 +-
include/trace/events/erofs.h | 6 +++---
3 files changed, 18 insertions(+), 29 deletions(-)
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index fc3a8d8064f8..82ebcee9d178 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -280,47 +280,36 @@ static int erofs_raw_access_readpage(struct file *file,
struct page *page)
return 0;
}
-static int erofs_raw_access_readpages(struct file *filp,
- struct address_space *mapping,
- struct list_head *pages,
- unsigned int nr_pages)
+static void erofs_raw_access_readahead(struct readahead_control *rac)
{
erofs_off_t last_block;
struct bio *bio = NULL;
- gfp_t gfp = readahead_gfp_mask(mapping);
- struct page *page = list_last_entry(pages, struct page, lru);
-
- trace_erofs_readpages(mapping->host, page, nr_pages, true);
+ struct page *page;
- for (; nr_pages; --nr_pages) {
- page = list_entry(pages->prev, struct page, lru);
+ trace_erofs_readpages(rac->mapping->host, readahead_index(rac),
+ readahead_count(rac), true);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping, page->index, gfp)) {
- bio = erofs_read_raw_page(bio, mapping, page,
- &last_block, nr_pages, true);
+ bio = erofs_read_raw_page(bio, rac->mapping, page, &last_block,
+ readahead_count(rac), true);
- /* all the page errors are ignored when readahead */
- if (IS_ERR(bio)) {
- pr_err("%s, readahead error at page %lu of nid %llu\n",
- __func__, page->index,
- EROFS_I(mapping->host)->nid);
+ /* all the page errors are ignored when readahead */
+ if (IS_ERR(bio)) {
+ pr_err("%s, readahead error at page %lu of nid %llu\n",
+ __func__, page->index,
+ EROFS_I(rac->mapping->host)->nid);
- bio = NULL;
- }
+ bio = NULL;
}
- /* pages could still be locked */
put_page(page);
}
- DBG_BUGON(!list_empty(pages));
/* the rare case (end in gaps) */
if (bio)
submit_bio(bio);
- return 0;
}
static int erofs_get_block(struct inode *inode, sector_t iblock,
@@ -358,7 +347,7 @@ static sector_t erofs_bmap(struct address_space *mapping,
sector_t block)
/* for uncompressed (aligned) files and raw access for other files */
const struct address_space_operations erofs_raw_access_aops = {
.readpage = erofs_raw_access_readpage,
- .readpages = erofs_raw_access_readpages,
+ .readahead = erofs_raw_access_readahead,
.bmap = erofs_bmap,
};
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 80e47f07d946..17f45fcb8c5c 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1315,7 +1315,7 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
struct page *head = NULL;
LIST_HEAD(pagepool);
- trace_erofs_readpages(mapping->host, lru_to_page(pages),
+ trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
nr_pages, false);
f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
diff --git a/include/trace/events/erofs.h b/include/trace/events/erofs.h
index 27f5caa6299a..bf9806fd1306 100644
--- a/include/trace/events/erofs.h
+++ b/include/trace/events/erofs.h
@@ -113,10 +113,10 @@ TRACE_EVENT(erofs_readpage,
TRACE_EVENT(erofs_readpages,
- TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage,
+ TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage,
bool raw),
- TP_ARGS(inode, page, nrpage, raw),
+ TP_ARGS(inode, start, nrpage, raw),
TP_STRUCT__entry(
__field(dev_t, dev )
@@ -129,7 +129,7 @@ TRACE_EVENT(erofs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->nid = EROFS_I(inode)->nid;
- __entry->start = page->index;
+ __entry->start = start;
__entry->nrpage = nrpage;
__entry->raw = raw;
),
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 12/16] ext4: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in ext4
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/ext4/ext4.h | 3 +--
fs/ext4/inode.c | 23 ++++++++++-------------
fs/ext4/readpage.c | 22 ++++++++--------------
3 files changed, 19 insertions(+), 29 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 9a2ee2428ecc..3af755da101d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3276,8 +3276,7 @@ static inline void ext4_set_de_type(struct super_block
*sb,
/* readpages.c */
extern int ext4_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead);
+ struct readahead_control *rac, struct page *page);
extern int __init ext4_init_post_read_processing(void);
extern void ext4_exit_post_read_processing(void);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1305b810c44a..7770e38e17e7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3218,7 +3218,7 @@ static sector_t ext4_bmap(struct address_space *mapping,
sector_t block)
static int ext4_readpage(struct file *file, struct page *page)
{
int ret = -EAGAIN;
- struct inode *inode = page->mapping->host;
+ struct inode *inode = file_inode(file);
trace_ext4_readpage(page);
@@ -3226,23 +3226,20 @@ static int ext4_readpage(struct file *file, struct page
*page)
ret = ext4_readpage_inline(inode, page);
if (ret == -EAGAIN)
- return ext4_mpage_readpages(page->mapping, NULL, page, 1,
- false);
+ return ext4_mpage_readpages(page->mapping, NULL, page);
return ret;
}
-static int
-ext4_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ext4_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
- /* If the file has inline data, no need to do readpages. */
+ /* If the file has inline data, no need to do readahead. */
if (ext4_has_inline_data(inode))
- return 0;
+ return;
- return ext4_mpage_readpages(mapping, pages, NULL, nr_pages, true);
+ ext4_mpage_readpages(rac->mapping, rac, NULL);
}
static void ext4_invalidatepage(struct page *page, unsigned int offset,
@@ -3587,7 +3584,7 @@ static int ext4_set_page_dirty(struct page *page)
static const struct address_space_operations ext4_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_write_begin,
@@ -3604,7 +3601,7 @@ static const struct address_space_operations ext4_aops = {
static const struct address_space_operations ext4_journalled_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_write_begin,
@@ -3620,7 +3617,7 @@ static const struct address_space_operations
ext4_journalled_aops = {
static const struct address_space_operations ext4_da_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_da_write_begin,
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index c1769afbf799..e14841ade612 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -7,8 +7,8 @@
*
* This was originally taken from fs/mpage.c
*
- * The intent is the ext4_mpage_readpages() function here is intended
- * to replace mpage_readpages() in the general case, not just for
+ * The ext4_mpage_readahead() function here is intended to
+ * replace mpage_readahead() in the general case, not just for
* encrypted files. It has some limitations (see below), where it
* will fall back to read_block_full_page(), but these limitations
* should only be hit when page_size != block_size.
@@ -222,8 +222,7 @@ static inline loff_t ext4_readpage_limit(struct inode
*inode)
}
int ext4_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead)
+ struct readahead_control *rac, struct page *page)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
@@ -241,6 +240,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
int length;
unsigned relative_block = 0;
struct ext4_map_blocks map;
+ unsigned int nr_pages = rac ? readahead_count(rac) : 1;
map.m_pblk = 0;
map.m_lblk = 0;
@@ -251,14 +251,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
int fully_mapped = 1;
unsigned first_hole = blocks_per_page;
- if (pages) {
- page = lru_to_page(pages);
-
+ if (rac) {
+ page = readahead_page(rac);
prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping, page->index,
- readahead_gfp_mask(mapping)))
- goto next_page;
}
if (page_has_buffers(page))
@@ -381,7 +376,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
bio->bi_end_io = mpage_end_io;
bio_set_op_attrs(bio, REQ_OP_READ,
- is_readahead ? REQ_RAHEAD : 0);
+ rac ? REQ_RAHEAD : 0);
}
length = first_hole << blkbits;
@@ -406,10 +401,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
else
unlock_page(page);
next_page:
- if (pages)
+ if (rac)
put_page(page);
}
- BUG_ON(pages && !list_empty(pages));
if (bio)
submit_bio(bio);
return 0;
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 13/19] erofs: Convert compressed files from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in erofs.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/erofs/zdata.c | 29 +++++++++--------------------
1 file changed, 9 insertions(+), 20 deletions(-)
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 17f45fcb8c5c..7c02015d501d 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1303,28 +1303,23 @@ static bool should_decompress_synchronously(struct
erofs_sb_info *sbi,
return nr <= sbi->max_sync_decompress_pages;
}
-static int z_erofs_readpages(struct file *filp, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void z_erofs_readahead(struct readahead_control *rac)
{
- struct inode *const inode = mapping->host;
+ struct inode *const inode = rac->mapping->host;
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
- bool sync = should_decompress_synchronously(sbi, nr_pages);
+ bool sync = should_decompress_synchronously(sbi, readahead_count(rac));
struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
- gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
- struct page *head = NULL;
+ struct page *page, *head = NULL;
LIST_HEAD(pagepool);
- trace_erofs_readpages(mapping->host, lru_to_page(pages)->index,
- nr_pages, false);
+ trace_erofs_readpages(inode, readahead_index(rac),
+ readahead_count(rac), false);
- f.headoffset = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
-
- for (; nr_pages; --nr_pages) {
- struct page *page = lru_to_page(pages);
+ f.headoffset = readahead_offset(rac);
+ readahead_for_each(rac, page) {
prefetchw(&page->flags);
- list_del(&page->lru);
/*
* A pure asynchronous readahead is indicated if
@@ -1333,11 +1328,6 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
*/
sync &= !(PageReadahead(page) && !head);
- if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {
- list_add(&page->lru, &pagepool);
- continue;
- }
-
set_page_private(page, (unsigned long)head);
head = page;
}
@@ -1366,11 +1356,10 @@ static int z_erofs_readpages(struct file *filp, struct
address_space *mapping,
/* clean up the remaining free pages */
put_pages_list(&pagepool);
- return 0;
}
const struct address_space_operations z_erofs_aops = {
.readpage = z_erofs_readpage,
- .readpages = z_erofs_readpages,
+ .readahead = z_erofs_readahead,
};
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 13/16] f2fs: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in f2fs
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/f2fs/data.c | 50 +++++++++++++++----------------------
fs/f2fs/f2fs.h | 5 ++--
include/trace/events/f2fs.h | 6 ++---
3 files changed, 25 insertions(+), 36 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b27b72107911..87964e4cb6b8 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2159,13 +2159,11 @@ int f2fs_read_multi_pages(struct compress_ctx *cc,
struct bio **bio_ret,
* use ->readpage() or do the necessary surgery to decouple ->readpages()
* from read-ahead.
*/
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead)
+int f2fs_mpage_readpages(struct inode *inode, struct readahead_control *rac,
+ struct page *page)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
- struct inode *inode = mapping->host;
struct f2fs_map_blocks map;
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct compress_ctx cc = {
@@ -2179,6 +2177,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
.nr_cpages = 0,
};
#endif
+ unsigned nr_pages = rac ? readahead_count(rac) : 1;
unsigned max_nr_pages = nr_pages;
int ret = 0;
@@ -2192,15 +2191,9 @@ int f2fs_mpage_readpages(struct address_space *mapping,
map.m_may_create = false;
for (; nr_pages; nr_pages--) {
- if (pages) {
- page = list_last_entry(pages, struct page, lru);
-
+ if (rac) {
+ page = readahead_page(rac);
prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping,
- page_index(page),
- readahead_gfp_mask(mapping)))
- goto next_page;
}
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2210,7 +2203,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ rac);
f2fs_destroy_compress_ctx(&cc);
if (ret)
goto set_error_page;
@@ -2233,7 +2226,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
#endif
ret = f2fs_read_single_page(inode, page, max_nr_pages, &map,
- &bio, &last_block_in_bio, is_readahead);
+ &bio, &last_block_in_bio, rac);
if (ret) {
#ifdef CONFIG_F2FS_FS_COMPRESSION
set_error_page:
@@ -2242,8 +2235,10 @@ int f2fs_mpage_readpages(struct address_space *mapping,
zero_user_segment(page, 0, PAGE_SIZE);
unlock_page(page);
}
+#ifdef CONFIG_F2FS_FS_COMPRESSION
next_page:
- if (pages)
+#endif
+ if (rac)
put_page(page);
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2253,16 +2248,15 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ rac);
f2fs_destroy_compress_ctx(&cc);
}
}
#endif
}
- BUG_ON(pages && !list_empty(pages));
if (bio)
__submit_bio(F2FS_I_SB(inode), bio, DATA);
- return pages ? 0 : ret;
+ return ret;
}
static int f2fs_read_data_page(struct file *file, struct page *page)
@@ -2281,28 +2275,24 @@ static int f2fs_read_data_page(struct file *file, struct
page *page)
if (f2fs_has_inline_data(inode))
ret = f2fs_read_inline_data(inode, page);
if (ret == -EAGAIN)
- ret = f2fs_mpage_readpages(page_file_mapping(page),
- NULL, page, 1, false);
+ ret = f2fs_mpage_readpages(inode, NULL, page);
return ret;
}
-static int f2fs_read_data_pages(struct file *file,
- struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void f2fs_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
- struct page *page = list_last_entry(pages, struct page, lru);
+ struct inode *inode = rac->mapping->host;
- trace_f2fs_readpages(inode, page, nr_pages);
+ trace_f2fs_readpages(inode, readahead_index(rac), readahead_count(rac));
if (!f2fs_is_compress_backend_ready(inode))
- return 0;
+ return;
/* If the file has inline data, skip readpages */
if (f2fs_has_inline_data(inode))
- return 0;
+ return;
- return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
+ f2fs_mpage_readpages(inode, rac, NULL);
}
int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
@@ -3784,7 +3774,7 @@ static void f2fs_swap_deactivate(struct file *file)
const struct address_space_operations f2fs_dblock_aops = {
.readpage = f2fs_read_data_page,
- .readpages = f2fs_read_data_pages,
+ .readahead = f2fs_readahead,
.writepage = f2fs_write_data_page,
.writepages = f2fs_write_data_pages,
.write_begin = f2fs_write_begin,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 5355be6b6755..b5e72dee8826 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3344,9 +3344,8 @@ int f2fs_reserve_new_block(struct dnode_of_data *dn);
int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index);
int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from);
int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index);
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead);
+int f2fs_mpage_readpages(struct inode *inode, struct readahead_control *rac,
+ struct page *page);
struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
int op_flags, bool for_write);
struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index);
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 67a97838c2a0..d72da4a33883 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1375,9 +1375,9 @@ TRACE_EVENT(f2fs_writepages,
TRACE_EVENT(f2fs_readpages,
- TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage),
+ TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage),
- TP_ARGS(inode, page, nrpage),
+ TP_ARGS(inode, start, nrpage),
TP_STRUCT__entry(
__field(dev_t, dev)
@@ -1389,7 +1389,7 @@ TRACE_EVENT(f2fs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
- __entry->start = page->index;
+ __entry->start = start;
__entry->nrpage = nrpage;
),
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 14/19] ext4: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in ext4
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/ext4/ext4.h | 3 +--
fs/ext4/inode.c | 23 ++++++++++-------------
fs/ext4/readpage.c | 22 ++++++++--------------
3 files changed, 19 insertions(+), 29 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 4441331d06cc..1570a0b51b73 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3279,8 +3279,7 @@ static inline void ext4_set_de_type(struct super_block
*sb,
/* readpages.c */
extern int ext4_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead);
+ struct readahead_control *rac, struct page *page);
extern int __init ext4_init_post_read_processing(void);
extern void ext4_exit_post_read_processing(void);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e60aca791d3f..b3349bfb75b8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3218,7 +3218,7 @@ static sector_t ext4_bmap(struct address_space *mapping,
sector_t block)
static int ext4_readpage(struct file *file, struct page *page)
{
int ret = -EAGAIN;
- struct inode *inode = page->mapping->host;
+ struct inode *inode = file_inode(file);
trace_ext4_readpage(page);
@@ -3226,23 +3226,20 @@ static int ext4_readpage(struct file *file, struct page
*page)
ret = ext4_readpage_inline(inode, page);
if (ret == -EAGAIN)
- return ext4_mpage_readpages(page->mapping, NULL, page, 1,
- false);
+ return ext4_mpage_readpages(page->mapping, NULL, page);
return ret;
}
-static int
-ext4_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void ext4_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
- /* If the file has inline data, no need to do readpages. */
+ /* If the file has inline data, no need to do readahead. */
if (ext4_has_inline_data(inode))
- return 0;
+ return;
- return ext4_mpage_readpages(mapping, pages, NULL, nr_pages, true);
+ ext4_mpage_readpages(rac->mapping, rac, NULL);
}
static void ext4_invalidatepage(struct page *page, unsigned int offset,
@@ -3587,7 +3584,7 @@ static int ext4_set_page_dirty(struct page *page)
static const struct address_space_operations ext4_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_write_begin,
@@ -3604,7 +3601,7 @@ static const struct address_space_operations ext4_aops = {
static const struct address_space_operations ext4_journalled_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_write_begin,
@@ -3620,7 +3617,7 @@ static const struct address_space_operations
ext4_journalled_aops = {
static const struct address_space_operations ext4_da_aops = {
.readpage = ext4_readpage,
- .readpages = ext4_readpages,
+ .readahead = ext4_readahead,
.writepage = ext4_writepage,
.writepages = ext4_writepages,
.write_begin = ext4_da_write_begin,
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index c1769afbf799..e14841ade612 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -7,8 +7,8 @@
*
* This was originally taken from fs/mpage.c
*
- * The intent is the ext4_mpage_readpages() function here is intended
- * to replace mpage_readpages() in the general case, not just for
+ * The ext4_mpage_readahead() function here is intended to
+ * replace mpage_readahead() in the general case, not just for
* encrypted files. It has some limitations (see below), where it
* will fall back to read_block_full_page(), but these limitations
* should only be hit when page_size != block_size.
@@ -222,8 +222,7 @@ static inline loff_t ext4_readpage_limit(struct inode
*inode)
}
int ext4_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead)
+ struct readahead_control *rac, struct page *page)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
@@ -241,6 +240,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
int length;
unsigned relative_block = 0;
struct ext4_map_blocks map;
+ unsigned int nr_pages = rac ? readahead_count(rac) : 1;
map.m_pblk = 0;
map.m_lblk = 0;
@@ -251,14 +251,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
int fully_mapped = 1;
unsigned first_hole = blocks_per_page;
- if (pages) {
- page = lru_to_page(pages);
-
+ if (rac) {
+ page = readahead_page(rac);
prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping, page->index,
- readahead_gfp_mask(mapping)))
- goto next_page;
}
if (page_has_buffers(page))
@@ -381,7 +376,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
bio->bi_iter.bi_sector = blocks[0] << (blkbits - 9);
bio->bi_end_io = mpage_end_io;
bio_set_op_attrs(bio, REQ_OP_READ,
- is_readahead ? REQ_RAHEAD : 0);
+ rac ? REQ_RAHEAD : 0);
}
length = first_hole << blkbits;
@@ -406,10 +401,9 @@ int ext4_mpage_readpages(struct address_space *mapping,
else
unlock_page(page);
next_page:
- if (pages)
+ if (rac)
put_page(page);
}
- BUG_ON(pages && !list_empty(pages));
if (bio)
submit_bio(bio);
return 0;
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 14/16] fuse: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in fuse. Switching away from the
read_cache_pages() helper gets rid of an implicit call to put_page(),
so we can get rid of the get_page() call in fuse_readpages_fill().
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/fuse/file.c | 46 +++++++++++++++++++---------------------------
1 file changed, 19 insertions(+), 27 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9d67b830fb7a..f64f98708b5e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -923,9 +923,8 @@ struct fuse_fill_data {
unsigned int max_pages;
};
-static int fuse_readpages_fill(void *_data, struct page *page)
+static int fuse_readpages_fill(struct fuse_fill_data *data, struct page *page)
{
- struct fuse_fill_data *data = _data;
struct fuse_io_args *ia = data->ia;
struct fuse_args_pages *ap = &ia->ap;
struct inode *inode = data->inode;
@@ -941,10 +940,8 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
fc->max_pages);
fuse_send_readpages(ia, data->file);
data->ia = ia = fuse_io_alloc(NULL, data->max_pages);
- if (!ia) {
- unlock_page(page);
+ if (!ia)
return -ENOMEM;
- }
ap = &ia->ap;
}
@@ -954,7 +951,6 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
return -EIO;
}
- get_page(page);
ap->pages[ap->num_pages] = page;
ap->descs[ap->num_pages].length = PAGE_SIZE;
ap->num_pages++;
@@ -962,37 +958,33 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
return 0;
}
-static int fuse_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void fuse_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_fill_data data;
- int err;
+ struct page *page;
- err = -EIO;
if (is_bad_inode(inode))
- goto out;
+ return;
- data.file = file;
+ data.file = rac->file;
data.inode = inode;
- data.nr_pages = nr_pages;
- data.max_pages = min_t(unsigned int, nr_pages, fc->max_pages);
-;
+ data.nr_pages = readahead_count(rac);
+ data.max_pages = min_t(unsigned int, data.nr_pages, fc->max_pages);
data.ia = fuse_io_alloc(NULL, data.max_pages);
- err = -ENOMEM;
if (!data.ia)
- goto out;
+ return;
- err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
- if (!err) {
- if (data.ia->ap.num_pages)
- fuse_send_readpages(data.ia, file);
- else
- fuse_io_free(data.ia);
+ readahead_for_each(rac, page) {
+ if (fuse_readpages_fill(&data, page) != 0)
+ return;
}
-out:
- return err;
+
+ if (data.ia->ap.num_pages)
+ fuse_send_readpages(data.ia, rac->file);
+ else
+ fuse_io_free(data.ia);
}
static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to)
@@ -3373,10 +3365,10 @@ static const struct file_operations fuse_file_operations
= {
static const struct address_space_operations fuse_file_aops = {
.readpage = fuse_readpage,
+ .readahead = fuse_readahead,
.writepage = fuse_writepage,
.writepages = fuse_writepages,
.launder_page = fuse_launder_page,
- .readpages = fuse_readpages,
.set_page_dirty = __set_page_dirty_nobuffers,
.bmap = fuse_bmap,
.direct_IO = fuse_direct_IO,
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 15/19] f2fs: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in f2fs
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/f2fs/data.c | 50 +++++++++++++++----------------------
fs/f2fs/f2fs.h | 5 ++--
include/trace/events/f2fs.h | 6 ++---
3 files changed, 25 insertions(+), 36 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b27b72107911..87964e4cb6b8 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2159,13 +2159,11 @@ int f2fs_read_multi_pages(struct compress_ctx *cc,
struct bio **bio_ret,
* use ->readpage() or do the necessary surgery to decouple ->readpages()
* from read-ahead.
*/
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead)
+int f2fs_mpage_readpages(struct inode *inode, struct readahead_control *rac,
+ struct page *page)
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
- struct inode *inode = mapping->host;
struct f2fs_map_blocks map;
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct compress_ctx cc = {
@@ -2179,6 +2177,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
.nr_cpages = 0,
};
#endif
+ unsigned nr_pages = rac ? readahead_count(rac) : 1;
unsigned max_nr_pages = nr_pages;
int ret = 0;
@@ -2192,15 +2191,9 @@ int f2fs_mpage_readpages(struct address_space *mapping,
map.m_may_create = false;
for (; nr_pages; nr_pages--) {
- if (pages) {
- page = list_last_entry(pages, struct page, lru);
-
+ if (rac) {
+ page = readahead_page(rac);
prefetchw(&page->flags);
- list_del(&page->lru);
- if (add_to_page_cache_lru(page, mapping,
- page_index(page),
- readahead_gfp_mask(mapping)))
- goto next_page;
}
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2210,7 +2203,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ rac);
f2fs_destroy_compress_ctx(&cc);
if (ret)
goto set_error_page;
@@ -2233,7 +2226,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
#endif
ret = f2fs_read_single_page(inode, page, max_nr_pages, &map,
- &bio, &last_block_in_bio, is_readahead);
+ &bio, &last_block_in_bio, rac);
if (ret) {
#ifdef CONFIG_F2FS_FS_COMPRESSION
set_error_page:
@@ -2242,8 +2235,10 @@ int f2fs_mpage_readpages(struct address_space *mapping,
zero_user_segment(page, 0, PAGE_SIZE);
unlock_page(page);
}
+#ifdef CONFIG_F2FS_FS_COMPRESSION
next_page:
- if (pages)
+#endif
+ if (rac)
put_page(page);
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2253,16 +2248,15 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ rac);
f2fs_destroy_compress_ctx(&cc);
}
}
#endif
}
- BUG_ON(pages && !list_empty(pages));
if (bio)
__submit_bio(F2FS_I_SB(inode), bio, DATA);
- return pages ? 0 : ret;
+ return ret;
}
static int f2fs_read_data_page(struct file *file, struct page *page)
@@ -2281,28 +2275,24 @@ static int f2fs_read_data_page(struct file *file, struct
page *page)
if (f2fs_has_inline_data(inode))
ret = f2fs_read_inline_data(inode, page);
if (ret == -EAGAIN)
- ret = f2fs_mpage_readpages(page_file_mapping(page),
- NULL, page, 1, false);
+ ret = f2fs_mpage_readpages(inode, NULL, page);
return ret;
}
-static int f2fs_read_data_pages(struct file *file,
- struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void f2fs_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
- struct page *page = list_last_entry(pages, struct page, lru);
+ struct inode *inode = rac->mapping->host;
- trace_f2fs_readpages(inode, page, nr_pages);
+ trace_f2fs_readpages(inode, readahead_index(rac), readahead_count(rac));
if (!f2fs_is_compress_backend_ready(inode))
- return 0;
+ return;
/* If the file has inline data, skip readpages */
if (f2fs_has_inline_data(inode))
- return 0;
+ return;
- return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
+ f2fs_mpage_readpages(inode, rac, NULL);
}
int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
@@ -3784,7 +3774,7 @@ static void f2fs_swap_deactivate(struct file *file)
const struct address_space_operations f2fs_dblock_aops = {
.readpage = f2fs_read_data_page,
- .readpages = f2fs_read_data_pages,
+ .readahead = f2fs_readahead,
.writepage = f2fs_write_data_page,
.writepages = f2fs_write_data_pages,
.write_begin = f2fs_write_begin,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 5355be6b6755..b5e72dee8826 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3344,9 +3344,8 @@ int f2fs_reserve_new_block(struct dnode_of_data *dn);
int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index);
int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from);
int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index);
-int f2fs_mpage_readpages(struct address_space *mapping,
- struct list_head *pages, struct page *page,
- unsigned nr_pages, bool is_readahead);
+int f2fs_mpage_readpages(struct inode *inode, struct readahead_control *rac,
+ struct page *page);
struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
int op_flags, bool for_write);
struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index);
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 67a97838c2a0..d72da4a33883 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1375,9 +1375,9 @@ TRACE_EVENT(f2fs_writepages,
TRACE_EVENT(f2fs_readpages,
- TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage),
+ TP_PROTO(struct inode *inode, pgoff_t start, unsigned int nrpage),
- TP_ARGS(inode, page, nrpage),
+ TP_ARGS(inode, start, nrpage),
TP_STRUCT__entry(
__field(dev_t, dev)
@@ -1389,7 +1389,7 @@ TRACE_EVENT(f2fs_readpages,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
- __entry->start = page->index;
+ __entry->start = start;
__entry->nrpage = nrpage;
),
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 15/16] iomap: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in iomap. Convert XFS and ZoneFS to
use it.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/iomap/buffered-io.c | 116 ++++++++++++++++-------------------------
fs/iomap/trace.h | 2 +-
fs/xfs/xfs_aops.c | 13 ++---
fs/zonefs/super.c | 7 ++-
include/linux/iomap.h | 3 +-
5 files changed, 54 insertions(+), 87 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index cb3511eb152a..2bfcd5242264 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -214,9 +214,8 @@ iomap_read_end_io(struct bio *bio)
struct iomap_readpage_ctx {
struct page *cur_page;
bool cur_page_in_bio;
- bool is_readahead;
struct bio *bio;
- struct list_head *pages;
+ struct readahead_control *rac;
};
static void
@@ -307,11 +306,11 @@ iomap_readpage_actor(struct inode *inode, loff_t pos,
loff_t length, void *data,
if (ctx->bio)
submit_bio(ctx->bio);
- if (ctx->is_readahead) /* same as readahead_gfp_mask */
+ if (ctx->rac) /* same as readahead_gfp_mask */
gfp |= __GFP_NORETRY | __GFP_NOWARN;
ctx->bio = bio_alloc(gfp, min(BIO_MAX_PAGES, nr_vecs));
ctx->bio->bi_opf = REQ_OP_READ;
- if (ctx->is_readahead)
+ if (ctx->rac)
ctx->bio->bi_opf |= REQ_RAHEAD;
ctx->bio->bi_iter.bi_sector = sector;
bio_set_dev(ctx->bio, iomap->bdev);
@@ -367,104 +366,77 @@ iomap_readpage(struct page *page, const struct iomap_ops
*ops)
}
EXPORT_SYMBOL_GPL(iomap_readpage);
-static struct page *
-iomap_next_page(struct inode *inode, struct list_head *pages, loff_t pos,
- loff_t length, loff_t *done)
-{
- while (!list_empty(pages)) {
- struct page *page = lru_to_page(pages);
-
- if (page_offset(page) >= (u64)pos + length)
- break;
-
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, inode->i_mapping, page->index,
- GFP_NOFS))
- return page;
-
- /*
- * If we already have a page in the page cache at index we are
- * done. Upper layers don't care if it is uptodate after the
- * readpages call itself as every page gets checked again once
- * actually needed.
- */
- *done += PAGE_SIZE;
- put_page(page);
- }
-
- return NULL;
-}
-
static loff_t
-iomap_readpages_actor(struct inode *inode, loff_t pos, loff_t length,
+iomap_readahead_actor(struct inode *inode, loff_t pos, loff_t length,
void *data, struct iomap *iomap, struct iomap *srcmap)
{
struct iomap_readpage_ctx *ctx = data;
- loff_t done, ret;
+ loff_t ret, done = 0;
- for (done = 0; done < length; done += ret) {
- if (ctx->cur_page && offset_in_page(pos + done) == 0) {
- if (!ctx->cur_page_in_bio)
- unlock_page(ctx->cur_page);
- put_page(ctx->cur_page);
- ctx->cur_page = NULL;
- }
+ while (done < length) {
if (!ctx->cur_page) {
- ctx->cur_page = iomap_next_page(inode, ctx->pages,
- pos, length, &done);
- if (!ctx->cur_page)
- break;
+ ctx->cur_page = readahead_page(ctx->rac);
ctx->cur_page_in_bio = false;
}
ret = iomap_readpage_actor(inode, pos + done, length - done,
ctx, iomap, srcmap);
+ if (WARN_ON(ret == 0))
+ break;
+ done += ret;
+ if (offset_in_page(pos + done) == 0) {
+ readahead_next(ctx->rac);
+ if (!ctx->cur_page_in_bio)
+ unlock_page(ctx->cur_page);
+ put_page(ctx->cur_page);
+ ctx->cur_page = NULL;
+ }
}
return done;
}
-int
-iomap_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, const struct iomap_ops *ops)
+/**
+ * iomap_readahead - Attempt to read pages from a file.
+ * @rac: Describes the pages to be read.
+ * @ops: The operations vector for the filesystem.
+ *
+ * This function is for filesystems to call to implement their readahead
+ * address_space operation.
+ *
+ * Context: The file is pinned by the caller, and the pages to be read are
+ * all locked and have an elevated refcount. This function will unlock
+ * the pages (once I/O has completed on them, or I/O has been determined to
+ * not be necessary). It will also decrease the refcount once the pages
+ * have been submitted for I/O. After this point, the page may be removed
+ * from the page cache, and should not be referenced.
+ */
+void iomap_readahead(struct readahead_control *rac, const struct iomap_ops
*ops)
{
+ struct inode *inode = rac->mapping->host;
struct iomap_readpage_ctx ctx = {
- .pages = pages,
- .is_readahead = true,
+ .rac = rac,
};
- loff_t pos = page_offset(list_entry(pages->prev, struct page, lru));
- loff_t last = page_offset(list_entry(pages->next, struct page, lru));
- loff_t length = last - pos + PAGE_SIZE, ret = 0;
+ loff_t pos = readahead_offset(rac);
+ loff_t length = readahead_length(rac);
- trace_iomap_readpages(mapping->host, nr_pages);
+ trace_iomap_readahead(inode, readahead_count(rac));
while (length > 0) {
- ret = iomap_apply(mapping->host, pos, length, 0, ops,
- &ctx, iomap_readpages_actor);
+ loff_t ret = iomap_apply(inode, pos, length, 0, ops,
+ &ctx, iomap_readahead_actor);
if (ret <= 0) {
WARN_ON_ONCE(ret == 0);
- goto done;
+ break;
}
pos += ret;
length -= ret;
}
- ret = 0;
-done:
+
if (ctx.bio)
submit_bio(ctx.bio);
- if (ctx.cur_page) {
- if (!ctx.cur_page_in_bio)
- unlock_page(ctx.cur_page);
- put_page(ctx.cur_page);
- }
-
- /*
- * Check that we didn't lose a page due to the arcance calling
- * conventions..
- */
- WARN_ON_ONCE(!ret && !list_empty(ctx.pages));
- return ret;
+ BUG_ON(ctx.cur_page);
}
-EXPORT_SYMBOL_GPL(iomap_readpages);
+EXPORT_SYMBOL_GPL(iomap_readahead);
/*
* iomap_is_partially_uptodate checks whether blocks within a page are
diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h
index 6dc227b8c47e..d6ba705f938a 100644
--- a/fs/iomap/trace.h
+++ b/fs/iomap/trace.h
@@ -39,7 +39,7 @@ DEFINE_EVENT(iomap_readpage_class, name, \
TP_PROTO(struct inode *inode, int nr_pages), \
TP_ARGS(inode, nr_pages))
DEFINE_READPAGE_EVENT(iomap_readpage);
-DEFINE_READPAGE_EVENT(iomap_readpages);
+DEFINE_READPAGE_EVENT(iomap_readahead);
DECLARE_EVENT_CLASS(iomap_page_class,
TP_PROTO(struct inode *inode, struct page *page, unsigned long off,
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 58e937be24ce..6e68eeb50b07 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -621,14 +621,11 @@ xfs_vm_readpage(
return iomap_readpage(page, &xfs_read_iomap_ops);
}
-STATIC int
-xfs_vm_readpages(
- struct file *unused,
- struct address_space *mapping,
- struct list_head *pages,
- unsigned nr_pages)
+STATIC void
+xfs_vm_readahead(
+ struct readahead_control *rac)
{
- return iomap_readpages(mapping, pages, nr_pages, &xfs_read_iomap_ops);
+ iomap_readahead(rac, &xfs_read_iomap_ops);
}
static int
@@ -644,7 +641,7 @@ xfs_iomap_swapfile_activate(
const struct address_space_operations xfs_address_space_operations = {
.readpage = xfs_vm_readpage,
- .readpages = xfs_vm_readpages,
+ .readahead = xfs_vm_readahead,
.writepage = xfs_vm_writepage,
.writepages = xfs_vm_writepages,
.set_page_dirty = iomap_set_page_dirty,
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 8bc6ef82d693..8327a01d3bac 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -78,10 +78,9 @@ static int zonefs_readpage(struct file *unused, struct page
*page)
return iomap_readpage(page, &zonefs_iomap_ops);
}
-static int zonefs_readpages(struct file *unused, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void zonefs_readahead(struct readahead_control *rac)
{
- return iomap_readpages(mapping, pages, nr_pages, &zonefs_iomap_ops);
+ iomap_readahead(rac, &zonefs_iomap_ops);
}
/*
@@ -128,7 +127,7 @@ static int zonefs_writepages(struct address_space *mapping,
static const struct address_space_operations zonefs_file_aops = {
.readpage = zonefs_readpage,
- .readpages = zonefs_readpages,
+ .readahead = zonefs_readahead,
.writepage = zonefs_writepage,
.writepages = zonefs_writepages,
.set_page_dirty = iomap_set_page_dirty,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 8b09463dae0d..bc20bd04c2a2 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -155,8 +155,7 @@ loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t
length,
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops);
int iomap_readpage(struct page *page, const struct iomap_ops *ops);
-int iomap_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, const struct iomap_ops *ops);
+void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops);
int iomap_set_page_dirty(struct page *page);
int iomap_is_partially_uptodate(struct page *page, unsigned long from,
unsigned long count);
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 16/19] fuse: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in fuse. Switching away from the
read_cache_pages() helper gets rid of an implicit call to put_page(),
so we can get rid of the get_page() call in fuse_readpages_fill().
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/fuse/file.c | 46 +++++++++++++++++++---------------------------
1 file changed, 19 insertions(+), 27 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9d67b830fb7a..f64f98708b5e 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -923,9 +923,8 @@ struct fuse_fill_data {
unsigned int max_pages;
};
-static int fuse_readpages_fill(void *_data, struct page *page)
+static int fuse_readpages_fill(struct fuse_fill_data *data, struct page *page)
{
- struct fuse_fill_data *data = _data;
struct fuse_io_args *ia = data->ia;
struct fuse_args_pages *ap = &ia->ap;
struct inode *inode = data->inode;
@@ -941,10 +940,8 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
fc->max_pages);
fuse_send_readpages(ia, data->file);
data->ia = ia = fuse_io_alloc(NULL, data->max_pages);
- if (!ia) {
- unlock_page(page);
+ if (!ia)
return -ENOMEM;
- }
ap = &ia->ap;
}
@@ -954,7 +951,6 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
return -EIO;
}
- get_page(page);
ap->pages[ap->num_pages] = page;
ap->descs[ap->num_pages].length = PAGE_SIZE;
ap->num_pages++;
@@ -962,37 +958,33 @@ static int fuse_readpages_fill(void *_data, struct page
*page)
return 0;
}
-static int fuse_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void fuse_readahead(struct readahead_control *rac)
{
- struct inode *inode = mapping->host;
+ struct inode *inode = rac->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_fill_data data;
- int err;
+ struct page *page;
- err = -EIO;
if (is_bad_inode(inode))
- goto out;
+ return;
- data.file = file;
+ data.file = rac->file;
data.inode = inode;
- data.nr_pages = nr_pages;
- data.max_pages = min_t(unsigned int, nr_pages, fc->max_pages);
-;
+ data.nr_pages = readahead_count(rac);
+ data.max_pages = min_t(unsigned int, data.nr_pages, fc->max_pages);
data.ia = fuse_io_alloc(NULL, data.max_pages);
- err = -ENOMEM;
if (!data.ia)
- goto out;
+ return;
- err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
- if (!err) {
- if (data.ia->ap.num_pages)
- fuse_send_readpages(data.ia, file);
- else
- fuse_io_free(data.ia);
+ readahead_for_each(rac, page) {
+ if (fuse_readpages_fill(&data, page) != 0)
+ return;
}
-out:
- return err;
+
+ if (data.ia->ap.num_pages)
+ fuse_send_readpages(data.ia, rac->file);
+ else
+ fuse_io_free(data.ia);
}
static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to)
@@ -3373,10 +3365,10 @@ static const struct file_operations fuse_file_operations
= {
static const struct address_space_operations fuse_file_aops = {
.readpage = fuse_readpage,
+ .readahead = fuse_readahead,
.writepage = fuse_writepage,
.writepages = fuse_writepages,
.launder_page = fuse_launder_page,
- .readpages = fuse_readpages,
.set_page_dirty = __set_page_dirty_nobuffers,
.bmap = fuse_bmap,
.direct_IO = fuse_direct_IO,
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 16/16] mm: Use memalloc_nofs_save in readahead path
From: "Matthew Wilcox (Oracle)" <willy at infradead.org> Ensure that memory allocations in the readahead path do not attempt to reclaim file-backed pages, which could lead to a deadlock. It is possible, though unlikely this is the root cause of a problem observed by Cong Wang. Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org> Reported-by: Cong Wang <xiyou.wangcong at gmail.com> Suggested-by: Michal Hocko <mhocko at suse.com> --- mm/readahead.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/readahead.c b/mm/readahead.c index 566693f4e539..ae8abab939a3 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -22,6 +22,7 @@ #include <linux/mm_inline.h> #include <linux/blk-cgroup.h> #include <linux/fadvise.h> +#include <linux/sched/mm.h> #include "internal.h" @@ -157,6 +158,18 @@ void page_cache_readahead_limit(struct address_space *mapping, ._nr_pages = 0, }; + /* + * Partway through the readahead operation, we will have added + * locked pages to the page cache, but will not yet have submitted + * them for I/O. Adding another page may need to allocate memory, + * which can trigger memory reclaim. Telling the VM we're in + * the middle of a filesystem operation will cause it to not + * touch file-backed pages, preventing a deadlock. Most (all?) + * filesystems already specify __GFP_NOFS in their mapping's + * gfp_mask, but let's be explicit here. + */ + unsigned int nofs = memalloc_nofs_save(); + /* * Preallocate as many pages as we will need. */ @@ -210,6 +223,7 @@ void page_cache_readahead_limit(struct address_space *mapping, if (readahead_count(&rac)) read_pages(&rac, &page_pool); BUG_ON(!list_empty(&page_pool)); + memalloc_nofs_restore(nofs); } EXPORT_SYMBOL_GPL(page_cache_readahead_limit); -- 2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 17/19] iomap: Restructure iomap_readpages_actor
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
By putting the 'have we reached the end of the page' condition at the
end
of the loop instead of the beginning, we can remove the 'submit the last
page' code from iomap_readpages(). Also check that iomap_readpage_actor()
didn't return 0, which would lead to an endless loop.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/iomap/buffered-io.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index cb3511eb152a..44303f370b2d 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -400,15 +400,9 @@ iomap_readpages_actor(struct inode *inode, loff_t pos,
loff_t length,
void *data, struct iomap *iomap, struct iomap *srcmap)
{
struct iomap_readpage_ctx *ctx = data;
- loff_t done, ret;
+ loff_t ret, done = 0;
- for (done = 0; done < length; done += ret) {
- if (ctx->cur_page && offset_in_page(pos + done) == 0) {
- if (!ctx->cur_page_in_bio)
- unlock_page(ctx->cur_page);
- put_page(ctx->cur_page);
- ctx->cur_page = NULL;
- }
+ while (done < length) {
if (!ctx->cur_page) {
ctx->cur_page = iomap_next_page(inode, ctx->pages,
pos, length, &done);
@@ -418,6 +412,15 @@ iomap_readpages_actor(struct inode *inode, loff_t pos,
loff_t length,
}
ret = iomap_readpage_actor(inode, pos + done, length - done,
ctx, iomap, srcmap);
+ if (WARN_ON(ret == 0))
+ break;
+ done += ret;
+ if (offset_in_page(pos + done) == 0) {
+ if (!ctx->cur_page_in_bio)
+ unlock_page(ctx->cur_page);
+ put_page(ctx->cur_page);
+ ctx->cur_page = NULL;
+ }
}
return done;
@@ -451,11 +454,7 @@ iomap_readpages(struct address_space *mapping, struct
list_head *pages,
done:
if (ctx.bio)
submit_bio(ctx.bio);
- if (ctx.cur_page) {
- if (!ctx.cur_page_in_bio)
- unlock_page(ctx.cur_page);
- put_page(ctx.cur_page);
- }
+ BUG_ON(ctx.cur_page);
/*
* Check that we didn't lose a page due to the arcance calling
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 18/19] iomap: Convert from readpages to readahead
From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
Use the new readahead operation in iomap. Convert XFS and ZoneFS to
use it.
Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
fs/iomap/buffered-io.c | 91 +++++++++++++++---------------------------
fs/iomap/trace.h | 2 +-
fs/xfs/xfs_aops.c | 13 +++---
fs/zonefs/super.c | 7 ++--
include/linux/iomap.h | 3 +-
5 files changed, 42 insertions(+), 74 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 44303f370b2d..2bfcd5242264 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -214,9 +214,8 @@ iomap_read_end_io(struct bio *bio)
struct iomap_readpage_ctx {
struct page *cur_page;
bool cur_page_in_bio;
- bool is_readahead;
struct bio *bio;
- struct list_head *pages;
+ struct readahead_control *rac;
};
static void
@@ -307,11 +306,11 @@ iomap_readpage_actor(struct inode *inode, loff_t pos,
loff_t length, void *data,
if (ctx->bio)
submit_bio(ctx->bio);
- if (ctx->is_readahead) /* same as readahead_gfp_mask */
+ if (ctx->rac) /* same as readahead_gfp_mask */
gfp |= __GFP_NORETRY | __GFP_NOWARN;
ctx->bio = bio_alloc(gfp, min(BIO_MAX_PAGES, nr_vecs));
ctx->bio->bi_opf = REQ_OP_READ;
- if (ctx->is_readahead)
+ if (ctx->rac)
ctx->bio->bi_opf |= REQ_RAHEAD;
ctx->bio->bi_iter.bi_sector = sector;
bio_set_dev(ctx->bio, iomap->bdev);
@@ -367,36 +366,8 @@ iomap_readpage(struct page *page, const struct iomap_ops
*ops)
}
EXPORT_SYMBOL_GPL(iomap_readpage);
-static struct page *
-iomap_next_page(struct inode *inode, struct list_head *pages, loff_t pos,
- loff_t length, loff_t *done)
-{
- while (!list_empty(pages)) {
- struct page *page = lru_to_page(pages);
-
- if (page_offset(page) >= (u64)pos + length)
- break;
-
- list_del(&page->lru);
- if (!add_to_page_cache_lru(page, inode->i_mapping, page->index,
- GFP_NOFS))
- return page;
-
- /*
- * If we already have a page in the page cache at index we are
- * done. Upper layers don't care if it is uptodate after the
- * readpages call itself as every page gets checked again once
- * actually needed.
- */
- *done += PAGE_SIZE;
- put_page(page);
- }
-
- return NULL;
-}
-
static loff_t
-iomap_readpages_actor(struct inode *inode, loff_t pos, loff_t length,
+iomap_readahead_actor(struct inode *inode, loff_t pos, loff_t length,
void *data, struct iomap *iomap, struct iomap *srcmap)
{
struct iomap_readpage_ctx *ctx = data;
@@ -404,10 +375,7 @@ iomap_readpages_actor(struct inode *inode, loff_t pos,
loff_t length,
while (done < length) {
if (!ctx->cur_page) {
- ctx->cur_page = iomap_next_page(inode, ctx->pages,
- pos, length, &done);
- if (!ctx->cur_page)
- break;
+ ctx->cur_page = readahead_page(ctx->rac);
ctx->cur_page_in_bio = false;
}
ret = iomap_readpage_actor(inode, pos + done, length - done,
@@ -416,6 +384,7 @@ iomap_readpages_actor(struct inode *inode, loff_t pos,
loff_t length,
break;
done += ret;
if (offset_in_page(pos + done) == 0) {
+ readahead_next(ctx->rac);
if (!ctx->cur_page_in_bio)
unlock_page(ctx->cur_page);
put_page(ctx->cur_page);
@@ -426,44 +395,48 @@ iomap_readpages_actor(struct inode *inode, loff_t pos,
loff_t length,
return done;
}
-int
-iomap_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, const struct iomap_ops *ops)
+/**
+ * iomap_readahead - Attempt to read pages from a file.
+ * @rac: Describes the pages to be read.
+ * @ops: The operations vector for the filesystem.
+ *
+ * This function is for filesystems to call to implement their readahead
+ * address_space operation.
+ *
+ * Context: The file is pinned by the caller, and the pages to be read are
+ * all locked and have an elevated refcount. This function will unlock
+ * the pages (once I/O has completed on them, or I/O has been determined to
+ * not be necessary). It will also decrease the refcount once the pages
+ * have been submitted for I/O. After this point, the page may be removed
+ * from the page cache, and should not be referenced.
+ */
+void iomap_readahead(struct readahead_control *rac, const struct iomap_ops
*ops)
{
+ struct inode *inode = rac->mapping->host;
struct iomap_readpage_ctx ctx = {
- .pages = pages,
- .is_readahead = true,
+ .rac = rac,
};
- loff_t pos = page_offset(list_entry(pages->prev, struct page, lru));
- loff_t last = page_offset(list_entry(pages->next, struct page, lru));
- loff_t length = last - pos + PAGE_SIZE, ret = 0;
+ loff_t pos = readahead_offset(rac);
+ loff_t length = readahead_length(rac);
- trace_iomap_readpages(mapping->host, nr_pages);
+ trace_iomap_readahead(inode, readahead_count(rac));
while (length > 0) {
- ret = iomap_apply(mapping->host, pos, length, 0, ops,
- &ctx, iomap_readpages_actor);
+ loff_t ret = iomap_apply(inode, pos, length, 0, ops,
+ &ctx, iomap_readahead_actor);
if (ret <= 0) {
WARN_ON_ONCE(ret == 0);
- goto done;
+ break;
}
pos += ret;
length -= ret;
}
- ret = 0;
-done:
+
if (ctx.bio)
submit_bio(ctx.bio);
BUG_ON(ctx.cur_page);
-
- /*
- * Check that we didn't lose a page due to the arcance calling
- * conventions..
- */
- WARN_ON_ONCE(!ret && !list_empty(ctx.pages));
- return ret;
}
-EXPORT_SYMBOL_GPL(iomap_readpages);
+EXPORT_SYMBOL_GPL(iomap_readahead);
/*
* iomap_is_partially_uptodate checks whether blocks within a page are
diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h
index 6dc227b8c47e..d6ba705f938a 100644
--- a/fs/iomap/trace.h
+++ b/fs/iomap/trace.h
@@ -39,7 +39,7 @@ DEFINE_EVENT(iomap_readpage_class, name, \
TP_PROTO(struct inode *inode, int nr_pages), \
TP_ARGS(inode, nr_pages))
DEFINE_READPAGE_EVENT(iomap_readpage);
-DEFINE_READPAGE_EVENT(iomap_readpages);
+DEFINE_READPAGE_EVENT(iomap_readahead);
DECLARE_EVENT_CLASS(iomap_page_class,
TP_PROTO(struct inode *inode, struct page *page, unsigned long off,
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 58e937be24ce..6e68eeb50b07 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -621,14 +621,11 @@ xfs_vm_readpage(
return iomap_readpage(page, &xfs_read_iomap_ops);
}
-STATIC int
-xfs_vm_readpages(
- struct file *unused,
- struct address_space *mapping,
- struct list_head *pages,
- unsigned nr_pages)
+STATIC void
+xfs_vm_readahead(
+ struct readahead_control *rac)
{
- return iomap_readpages(mapping, pages, nr_pages, &xfs_read_iomap_ops);
+ iomap_readahead(rac, &xfs_read_iomap_ops);
}
static int
@@ -644,7 +641,7 @@ xfs_iomap_swapfile_activate(
const struct address_space_operations xfs_address_space_operations = {
.readpage = xfs_vm_readpage,
- .readpages = xfs_vm_readpages,
+ .readahead = xfs_vm_readahead,
.writepage = xfs_vm_writepage,
.writepages = xfs_vm_writepages,
.set_page_dirty = iomap_set_page_dirty,
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 8bc6ef82d693..8327a01d3bac 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -78,10 +78,9 @@ static int zonefs_readpage(struct file *unused, struct page
*page)
return iomap_readpage(page, &zonefs_iomap_ops);
}
-static int zonefs_readpages(struct file *unused, struct address_space *mapping,
- struct list_head *pages, unsigned int nr_pages)
+static void zonefs_readahead(struct readahead_control *rac)
{
- return iomap_readpages(mapping, pages, nr_pages, &zonefs_iomap_ops);
+ iomap_readahead(rac, &zonefs_iomap_ops);
}
/*
@@ -128,7 +127,7 @@ static int zonefs_writepages(struct address_space *mapping,
static const struct address_space_operations zonefs_file_aops = {
.readpage = zonefs_readpage,
- .readpages = zonefs_readpages,
+ .readahead = zonefs_readahead,
.writepage = zonefs_writepage,
.writepages = zonefs_writepages,
.set_page_dirty = iomap_set_page_dirty,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 8b09463dae0d..bc20bd04c2a2 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -155,8 +155,7 @@ loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t
length,
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops);
int iomap_readpage(struct page *page, const struct iomap_ops *ops);
-int iomap_readpages(struct address_space *mapping, struct list_head *pages,
- unsigned nr_pages, const struct iomap_ops *ops);
+void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops);
int iomap_set_page_dirty(struct page *page);
int iomap_is_partially_uptodate(struct page *page, unsigned long from,
unsigned long count);
--
2.25.0
Matthew Wilcox
2020-Feb-17 18:46 UTC
[Ocfs2-devel] [PATCH v6 19/19] mm: Use memalloc_nofs_save in readahead path
From: "Matthew Wilcox (Oracle)" <willy at infradead.org> Ensure that memory allocations in the readahead path do not attempt to reclaim file-backed pages, which could lead to a deadlock. It is possible, though unlikely this is the root cause of a problem observed by Cong Wang. Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org> Reported-by: Cong Wang <xiyou.wangcong at gmail.com> Suggested-by: Michal Hocko <mhocko at suse.com> --- mm/readahead.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/readahead.c b/mm/readahead.c index 94d499cfb657..8f9c0dba24e7 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -22,6 +22,7 @@ #include <linux/mm_inline.h> #include <linux/blk-cgroup.h> #include <linux/fadvise.h> +#include <linux/sched/mm.h> #include "internal.h" @@ -174,6 +175,18 @@ void page_cache_readahead_limit(struct address_space *mapping, ._nr_pages = 0, }; + /* + * Partway through the readahead operation, we will have added + * locked pages to the page cache, but will not yet have submitted + * them for I/O. Adding another page may need to allocate memory, + * which can trigger memory reclaim. Telling the VM we're in + * the middle of a filesystem operation will cause it to not + * touch file-backed pages, preventing a deadlock. Most (all?) + * filesystems already specify __GFP_NOFS in their mapping's + * gfp_mask, but let's be explicit here. + */ + unsigned int nofs = memalloc_nofs_save(); + /* * Preallocate as many pages as we will need. */ @@ -227,6 +240,7 @@ void page_cache_readahead_limit(struct address_space *mapping, if (readahead_count(&rac)) read_pages(&rac, &page_pool); BUG_ON(!list_empty(&page_pool)); + memalloc_nofs_restore(nofs); } EXPORT_SYMBOL_GPL(page_cache_readahead_limit); -- 2.25.0
On Mon, Feb 17, 2020 at 10:45:41AM -0800, Matthew Wilcox wrote:> This series adds a readahead address_space operation to eventually*sigh*. Clearly I forgot to rm -rf an earlier version. Please disregard any patches labelled n/16. I can send a v7 if this is too much hassle.
On Mon, Feb 17, 2020 at 10:45:41AM -0800, Matthew Wilcox wrote:> From: "Matthew Wilcox (Oracle)" <willy at infradead.org> > > This series adds a readahead address_space operation to eventually > replace the readpages operation. The key difference is that > pages are added to the page cache as they are allocated (and > then looked up by the filesystem) instead of passing them on a > list to the readpages operation and having the filesystem add > them to the page cache. It's a net reduction in code for each > implementation, more efficient than walking a list, and solves > the direct-write vs buffered-read problem reported by yu kuai at > https://urldefense.com/v3/__https://lore.kernel.org/linux-fsdevel/20200116063601.39201-1-yukuai3 at huawei.com/__;!!GqivPVa7Brio!PG0XOF_XLPTeC9-PLTUjM9796KcmbSN1oN8Rjtk2yl5s7qtiHifU7l4CXSN_HbtjQP326w$ > > The only unconverted filesystems are those which use fscache. > Their conversion is pending Dave Howells' rewrite which will make the > conversion substantially easier.Latest version in your git tree: $ ? glo -n 5 willy/readahead 4be497096c04 mm: Use memalloc_nofs_save in readahead path ff63497fcb98 iomap: Convert from readpages to readahead 26aee60e89b5 iomap: Restructure iomap_readpages_actor 8115bcca7312 fuse: Convert from readpages to readahead 3db3d10d9ea1 f2fs: Convert from readpages to readahead $ merged into a 5.6-rc2 tree fails at boot on my test vm: [ 2.423116] ------------[ cut here ]------------ [ 2.424957] list_add double add: new=ffffea000efff4c8, prev=ffff8883bfffee60, next=ffffea000efff4c8. [ 2.428259] WARNING: CPU: 4 PID: 1 at lib/list_debug.c:29 __list_add_valid+0x67/0x70 [ 2.430617] CPU: 4 PID: 1 Comm: sh Not tainted 5.6.0-rc2-dgc+ #1800 [ 2.432405] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 2.434744] RIP: 0010:__list_add_valid+0x67/0x70 [ 2.436107] Code: c6 4c 89 ca 48 c7 c7 10 41 58 82 e8 55 29 89 ff 0f 0b 31 c0 c3 48 89 f2 4c 89 c1 48 89 fe 48 c7 c7 60 41 58 82 e8 3b 29 89 ff <0f> 0b 31 c7 [ 2.441161] RSP: 0000:ffffc900018a3bb0 EFLAGS: 00010082 [ 2.442548] RAX: 0000000000000000 RBX: ffffea000efff4c0 RCX: 0000000000000256 [ 2.444432] RDX: 0000000000000001 RSI: 0000000000000086 RDI: ffffffff8288a8b0 [ 2.446315] RBP: ffffea000efff4c8 R08: ffffc900018a3a65 R09: 0000000000000256 [ 2.448199] R10: 0000000000000008 R11: ffffc900018a3a65 R12: ffffea000efff4c8 [ 2.450072] R13: ffff8883bfffee60 R14: 0000000000000010 R15: 0000000000000001 [ 2.451959] FS: 0000000000000000(0000) GS:ffff8883b9c00000(0000) knlGS:0000000000000000 [ 2.454083] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.455604] CR2: 00000000ffffffff CR3: 00000003b9a37002 CR4: 0000000000060ee0 [ 2.457484] Call Trace: [ 2.458171] __pagevec_lru_add_fn+0x15f/0x2c0 [ 2.459376] pagevec_lru_move_fn+0x87/0xd0 [ 2.460500] ? pagevec_move_tail_fn+0x2d0/0x2d0 [ 2.461712] lru_add_drain_cpu+0x8d/0x160 [ 2.462787] lru_add_drain+0x18/0x20 [ 2.463757] shift_arg_pages+0xb8/0x180 [ 2.464789] ? vprintk_emit+0x101/0x1c0 [ 2.465813] ? printk+0x58/0x6f [ 2.466659] setup_arg_pages+0x205/0x240 [ 2.467716] load_elf_binary+0x34a/0x1560 [ 2.468789] ? get_user_pages_remote+0x159/0x280 [ 2.470024] ? selinux_inode_permission+0x10d/0x1e0 [ 2.471323] ? _raw_read_unlock+0xa/0x20 [ 2.472375] ? load_misc_binary+0x2b2/0x410 [ 2.473492] search_binary_handler+0x60/0xe0 [ 2.474634] __do_execve_file.isra.0+0x512/0x850 [ 2.475888] ? rest_init+0xc6/0xc6 [ 2.476801] do_execve+0x21/0x30 [ 2.477671] try_to_run_init_process+0x10/0x34 [ 2.478855] kernel_init+0xe2/0xfa [ 2.479776] ret_from_fork+0x1f/0x30 [ 2.480737] ---[ end trace e77079de9b22dc6a ]--- I just dropped the ext4 conversion from my local tree so I can boot the machine and test XFS. Might have some more info when that crashes and burns... Cheers, Dave. -- Dave Chinner david at fromorbit.com
On 2/17/20 10:45 AM, Matthew Wilcox wrote:> From: "Matthew Wilcox (Oracle)" <willy at infradead.org> > > This series adds a readahead address_space operation to eventually > replace the readpages operation. The key difference is that > pages are added to the page cache as they are allocated (and > then looked up by the filesystem) instead of passing them on a > list to the readpages operation and having the filesystem add > them to the page cache. It's a net reduction in code for each > implementation, more efficient than walking a list, and solves > the direct-write vs buffered-read problem reported by yu kuai at > https://urldefense.com/v3/__https://lore.kernel.org/linux-fsdevel/20200116063601.39201-1-yukuai3 at huawei.com/__;!!GqivPVa7Brio!INyjUh_JZuHvugxA1VO2t-xcAfxdsK_JxS4XRC20brBDQvoHuQTRkFEg90i08ItLvrIYKg$ > > The only unconverted filesystems are those which use fscache. > Their conversion is pending Dave Howells' rewrite which will make the > conversion substantially easier.Hi Matthew, I see that Dave Chinner is reviewing this series, but I'm trying out his recent advice about code reviews [1], and so I'm not going to read his comments first. So you may see some duplication or contradictions this time around. [1] Somewhere in this thread, "[LSF/MM/BPF TOPIC] FS Maintainers Don't Scale": https://urldefense.com/v3/__https://lore.kernel.org/r/20200131052520.GC6869 at magnolia__;!!GqivPVa7Brio!INyjUh_JZuHvugxA1VO2t-xcAfxdsK_JxS4XRC20brBDQvoHuQTRkFEg90i08IsH_b9uOw$ thanks, -- John Hubbard NVIDIA> > v6: > - Name the private members of readahead_control with a leading underscore > (suggested by Christoph Hellwig) > - Fix whitespace in rst file > - Remove misleading comment in btrfs patch > - Add readahead_next() API and use it in iomap > - Add iomap_readahead kerneldoc. > - Fix the mpage_readahead kerneldoc > - Make various readahead functions return void > - Keep readahead_index() and readahead_offset() pointing to the start of > this batch through the body. No current user requires this, but it's > less surprising. > - Add kerneldoc for page_cache_readahead_limit > - Make page_idx an unsigned long, and rename it to just 'i' > - Get rid of page_offset local variable > - Add patch to call memalloc_nofs_save() before allocating pages (suggested > by Michal Hocko) > - Resplit a lot of patches for more logical progression and easier review > (suggested by John Hubbard) > - Added sign-offs where received, and I deemed still relevant > > v5 switched to passing a readahead_control struct (mirroring the > writepages_control struct passed to writepages). This has a number of > advantages: > - It fixes a number of bugs in various implementations, eg forgetting to > increment 'start', an off-by-one error in 'nr_pages' or treating 'start' > as a byte offset instead of a page offset. > - It allows us to change the arguments without changing all the > implementations of ->readahead which just call mpage_readahead() or > iomap_readahead() > - Figuring out which pages haven't been attempted by the implementation > is more natural this way. > - There's less code in each implementation. > > Matthew Wilcox (Oracle) (19): > mm: Return void from various readahead functions > mm: Ignore return value of ->readpages > mm: Use readahead_control to pass arguments > mm: Rearrange readahead loop > mm: Remove 'page_offset' from readahead loop > mm: rename readahead loop variable to 'i' > mm: Put readahead pages in cache earlier > mm: Add readahead address space operation > mm: Add page_cache_readahead_limit > fs: Convert mpage_readpages to mpage_readahead > btrfs: Convert from readpages to readahead > erofs: Convert uncompressed files from readpages to readahead > erofs: Convert compressed files from readpages to readahead > ext4: Convert from readpages to readahead > f2fs: Convert from readpages to readahead > fuse: Convert from readpages to readahead > iomap: Restructure iomap_readpages_actor > iomap: Convert from readpages to readahead > mm: Use memalloc_nofs_save in readahead path > > Documentation/filesystems/locking.rst | 6 +- > Documentation/filesystems/vfs.rst | 13 ++ > drivers/staging/exfat/exfat_super.c | 7 +- > fs/block_dev.c | 7 +- > fs/btrfs/extent_io.c | 46 ++----- > fs/btrfs/extent_io.h | 3 +- > fs/btrfs/inode.c | 16 +-- > fs/erofs/data.c | 39 ++---- > fs/erofs/zdata.c | 29 ++-- > fs/ext2/inode.c | 10 +- > fs/ext4/ext4.h | 3 +- > fs/ext4/inode.c | 23 ++-- > fs/ext4/readpage.c | 22 ++- > fs/ext4/verity.c | 35 +---- > fs/f2fs/data.c | 50 +++---- > fs/f2fs/f2fs.h | 5 +- > fs/f2fs/verity.c | 35 +---- > fs/fat/inode.c | 7 +- > fs/fuse/file.c | 46 +++---- > fs/gfs2/aops.c | 23 ++-- > fs/hpfs/file.c | 7 +- > fs/iomap/buffered-io.c | 118 +++++++---------- > fs/iomap/trace.h | 2 +- > fs/isofs/inode.c | 7 +- > fs/jfs/inode.c | 7 +- > fs/mpage.c | 38 ++---- > fs/nilfs2/inode.c | 15 +-- > fs/ocfs2/aops.c | 34 ++--- > fs/omfs/file.c | 7 +- > fs/qnx6/inode.c | 7 +- > fs/reiserfs/inode.c | 8 +- > fs/udf/inode.c | 7 +- > fs/xfs/xfs_aops.c | 13 +- > fs/zonefs/super.c | 7 +- > include/linux/fs.h | 2 + > include/linux/iomap.h | 3 +- > include/linux/mpage.h | 4 +- > include/linux/pagemap.h | 90 +++++++++++++ > include/trace/events/erofs.h | 6 +- > include/trace/events/f2fs.h | 6 +- > mm/internal.h | 8 +- > mm/migrate.c | 2 +- > mm/readahead.c | 184 +++++++++++++++++--------- > 43 files changed, 474 insertions(+), 533 deletions(-) > > > base-commit: 11a48a5a18c63fd7621bb050228cebf13566e4d8 >