Filipe Manana
2014-Oct-07 00:48 UTC
[PATCH] Btrfs: don't ignore compressed bio write errors
Our compressed bio write end callback was essentially ignoring the error
parameter. When a write error happens, it must pass a value of 0 to the
inode's write_page_end_io_hook callback, SetPageError on the respective
pages and set AS_EIO in the inode's mapping flags, so that a call to
filemap_fdatawait_range() / filemap_fdatawait() can find out that errors
happened (we surely don't want silent failures on fsync for example).
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
fs/btrfs/compression.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index eeee138..9f0e882 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -224,16 +224,19 @@ out:
* Clear the writeback bits on all of the file
* pages for a compressed write
*/
-static noinline void end_compressed_writeback(struct inode *inode, u64 start,
- unsigned long ram_size)
+static noinline void end_compressed_writeback(struct inode *inode,
+ const struct compressed_bio *cb)
{
- unsigned long index = start >> PAGE_CACHE_SHIFT;
- unsigned long end_index = (start + ram_size - 1) >> PAGE_CACHE_SHIFT;
+ unsigned long index = cb->start >> PAGE_CACHE_SHIFT;
+ unsigned long end_index = (cb->start + cb->len - 1) >>
PAGE_CACHE_SHIFT;
struct page *pages[16];
unsigned long nr_pages = end_index - index + 1;
int i;
int ret;
+ if (cb->errors)
+ mapping_set_error(inode->i_mapping, -EIO);
+
while (nr_pages > 0) {
ret = find_get_pages_contig(inode->i_mapping, index,
min_t(unsigned long,
@@ -244,6 +247,8 @@ static noinline void end_compressed_writeback(struct inode
*inode, u64 start,
continue;
}
for (i = 0; i < ret; i++) {
+ if (cb->errors)
+ SetPageError(pages[i]);
end_page_writeback(pages[i]);
page_cache_release(pages[i]);
}
@@ -287,10 +292,11 @@ static void end_compressed_bio_write(struct bio *bio, int
err)
tree->ops->writepage_end_io_hook(cb->compressed_pages[0],
cb->start,
cb->start + cb->len - 1,
- NULL, 1);
+ NULL,
+ err ? 0 : 1);
cb->compressed_pages[0]->mapping = NULL;
- end_compressed_writeback(inode, cb->start, cb->len);
+ end_compressed_writeback(inode, cb);
/* note, our inode could be gone now */
/*
--
1.9.1
--
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