Chandan Rajendra
2014-Jul-29 11:13 UTC
[RFC PATCH V5 00/12] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O.
This patchset continues with the work posted earlier at
https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg35547.html.
Changes from V1:
1. Remove usage of bio_vec->bv_{len,offset} in end_bio_extent_readpage()
and end_bio_extent_writepage().
Changes from V2:
1. Get __extent_writepage() to write only the dirty blocks of a page.
2. Fix "page private not zero on page" warning message which is
printed
when running xfstests.
Changes from V3:
1. Get "Hole punching" and "Extent preallocation" to work
correctly in
subpagesize-blocksize scenario.
2. Get btrfs_page_mkwrite() to reserve space in sectorsized units.
Changes from V4:
1. V2's "Btrfs: subpagesize-blocksize: Get rid of whole page
reads"
patch was incorrectly replaced with an older version when working
on V3 patches. Fix this.
2. Fix btrfs_endio_direct_read() to compute checksums for all possible
blocks in a page.
Xfstests' generic tests were run on an x86_64 machine with the patches
applied. The Btrfs kernel module was compiled without ACL and quotas support
and hence tests related to those were not run.
On multiple runs of the tests with 4k blocksize, 'umount' process would
sometimes get blocked indefinitely causing 'hung task detector' to print
the
function call trace.
For 2k blocksize, the following xfstests' generic tests failed:
068, 075, 091, 112, 127, 224 and 274.
The following is a list of known TODO items which will be implemented in
future revisions of this patchset:
1. The following command would cause a soft-lockup.
xfs_io -f -c "pwrite 0 6144" -c "sync_range 0 4096" -c
"truncate 4095" file.bin
2. Re-base patchset on top of linux-btrfs/next branch to make use of immutable
biovecs.
2. Remove PAGE_CACHE_SIZE delalloc reservation in
btrfs_writepage_fixup_worker().
3. Create separate slab caches for 'extent buffer head' and 'extent
buffer'.
4. Add 'leak list' tracking for 'extent buffer' instances.
5. Rename EXTENT_BUFFER_TREE_REF and EXTENT_BUFFER_IN_TREE to
EXTENT_BUFFER_HEAD_TREE_REF and EXTENT_BUFFER_HEAD_IN_TREE respectively.
6. Get Xfstests' generic tests to successfully run on both 4k and 2k
blocksizes.
Chandan Rajendra (10):
Btrfs: subpagesize-blocksize: Get rid of whole page reads.
Btrfs: subpagesize-blocksize: Get rid of whole page writes.
Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release
extents aligned to block size.
Btrfs: subpagesize-blocksize: Read tree blocks whose size is
<PAGE_CACHE_SIZE.
Btrfs: subpagesize-blocksize: Write only dirty extent buffers
belonging to a page
Btrfs: subpagesize-blocksize: Compute and look up csums based on
sectorsized blocks.
Btrfs: subpagesize-blocksize: __extent_writepage: Write only dirty
blocks of a page.
Btrfs: subpagesize-blocksize: fallocate: Work with sectorsized units.
Btrfs: subpagesize-blocksize: btrfs_page_mkwrite: Reserve space in
sectorsized units.
Btrfs: subpagesize-blocksize: Search for all ordered extents that
could span across a page.
Chandra Seetharaman (2):
Btrfs: subpagesize-blocksize: Define extent_buffer_head.
Btrfs: subpagesize-blocksize: Allow mounting filesystems where
sectorsize != PAGE_SIZE
fs/btrfs/backref.c | 2 +-
fs/btrfs/ctree.c | 2 +-
fs/btrfs/ctree.h | 8 +-
fs/btrfs/disk-io.c | 117 +++--
fs/btrfs/disk-io.h | 3 +
fs/btrfs/extent-tree.c | 6 +-
fs/btrfs/extent_io.c | 1191 ++++++++++++++++++++++++++++--------------
fs/btrfs/extent_io.h | 48 +-
fs/btrfs/file-item.c | 85 +--
fs/btrfs/file.c | 67 ++-
fs/btrfs/inode.c | 184 ++++---
fs/btrfs/volumes.c | 2 +-
fs/btrfs/volumes.h | 3 +
include/trace/events/btrfs.h | 2 +-
14 files changed, 1124 insertions(+), 596 deletions(-)
--
1.8.3.1
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