This patchset continues with the work posted earlier at
https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg38862.html.
Changes from V9:
1. Earlier, In read_extent_buffer_pages(), we used to check for extent buffer
pages' PG_uptodate flag immediately after the page was unlocked by the
endio function. However, the PG_uptodate flag is set on the pages only
after the read operation on all pages complete successfully and the
verification of the extent buffer's contents is done. Fix this by checking
only for EXTENT_BUFFER_UPTODATE flag in read_extent_buffer_pages().
2. Add the new EXTENT_READ_IO extent state bit to reliably unlock pages in
readpage's end bio function.
3. Use (eb->start, seq) as search key for tree modification log.
4. btrfs_submit_direct_hook: Prevent zero length bios from being submitted
when map_length < bio vector length.
5. Enabled POSIX ACL support.
Changes from V8:
1. In subpagesize-blocksize scenario, prevent writes to an extent
buffer when the corresponding page's PG_writeback flag is set. This
race condition was triggered when running xfstests' generic/083
test. With the new patch applied, I have run the complete xfstests
suite as well as run generic/083 multiple times on both 4k and 2k
block size setups. There were 2 non-related test failures that
occured rarely, but they were reproducible even when the patch was
not applied.
Changes from V7:
1. Fix a softlockup issue that occured because the page corresponding
to the delalloc region did not exist. This bug was introduced by
the code added in btrfs_invalidatepage and related functions in V7
version.
Changes from V6:
1. Fix softlockup issue that occured during unmounting a 4k blocksized
filesystem instance.
2. Track blocks of an ordered extent submitted for write I/O to avoid
I/O resubmission in certain scenarios.
Changes from V5:
1. Rebased patchset on top of current btrfs-next tree (i.e. commit
8d875f95da43c6a8f18f77869f2ef26e9594fecc). This involved using
"immutable biovecs".
2. Deal with partially allocated ordered extents across a page.
3. Explicitly track I/O status of blocks of an ordered extent.
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.
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 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 V1:
1. Remove usage of bio_vec->bv_{len,offset} in end_bio_extent_readpage()
and end_bio_extent_writepage().
Xfstests' generic tests were run on an x86_64 machine with the patches
applied for blocksizes 2k and 4k.
For 2k blocksize, the following xfstests' generic tests failed:
1. generic/068
The following xfstests' generic tests failed for both 2k and 4k blocksize:
1. generic/008 - FALLOC_FL_ZERO_RANGE is not supported by Btrfs.
2. generic/091 - FALLOC_FL_ZERO_RANGE is not supported by Btrfs.
3. generic/224
This looks mostly an issue caused by non-btrfs code as the test failed
for the exact same reason when run on an ext4 filesystem instance.
4. generic/263 - FALLOC_FL_ZERO_RANGE is not supported by Btrfs.
5. generic/274
This test very rarely results in a hung task.
The following is a list of known TODO items which will be implemented in
future revisions of this patchset:
1. The xfstests suite was based off the corresponding git tree as available on
March 2014. Pull the latest from the xfstests git tree and execute the
tests.
2. Rebase the patches on top of the current linux-btrfs/next branch.
3. Get Xfstests' generic tests to successfully run on both 4k and 2k
blocksizes.
4. Remove PAGE_CACHE_SIZE delalloc reservation in
btrfs_writepage_fixup_worker().
5. Create separate slab caches for 'extent buffer head' and 'extent buffer'.
6. Add 'leak list' tracking for 'extent buffer' instances.
7. Rename EXTENT_BUFFER_TREE_REF and EXTENT_BUFFER_IN_TREE to
EXTENT_BUFFER_HEAD_TREE_REF and EXTENT_BUFFER_HEAD_IN_TREE respectively.
Chandan Rajendra (17):
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.
Btrfs: subpagesize-blocksize: Deal with partial ordered extent
allocations.
Btrfs: subpagesize-blocksize: Explicitly Track I/O status of blocks of
an ordered extent.
Btrfs: subpagesize-blocksize: Revert commit
fc4adbff823f76577ece26dcb88bf6f8392dbd43.
Btrfs: subpagesize-blocksize: Track blocks of ordered extent submitted
for write I/O.
Btrfs: subpagesize-blocksize: Prevent writes to an extent buffer when
PG_writeback flag is set.
Btrfs: subpagesize-blocksize: Use (eb->start, seq) as search key for
tree modification log.
Btrfs: subpagesize-blocksize: btrfs_submit_direct_hook: Handle
map_length < bio vector length
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/btrfs_inode.h | 2 -
fs/btrfs/ctree.c | 56 +-
fs/btrfs/ctree.h | 8 +-
fs/btrfs/disk-io.c | 117 ++--
fs/btrfs/disk-io.h | 3 +
fs/btrfs/extent-tree.c | 18 +-
fs/btrfs/extent_io.c | 1274 +++++++++++++++++++++++++++++-------------
fs/btrfs/extent_io.h | 60 +-
fs/btrfs/file-item.c | 87 +--
fs/btrfs/file.c | 77 +--
fs/btrfs/inode.c | 603 ++++++++++++--------
fs/btrfs/ordered-data.c | 19 +
fs/btrfs/ordered-data.h | 8 +
fs/btrfs/volumes.c | 2 +-
include/trace/events/btrfs.h | 2 +-
16 files changed, 1573 insertions(+), 765 deletions(-)
--
2.1.0
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