[PATCH v2 00/13] forcealign for xfs

John Garry
2024-07-05T16:25:22Z

This series is being spun off the block atomic writes for xfs series at
[0].

That series has got too big and also has a dependency on the core block
atomic writes support, which has now been queued for 6.11 in Jens' block
tree [1].

The actual forcealign patches are the same in this series, modulo an
attempt for a fix in xfs_bunmapi_align().

Why forcealign?
In some scenarios to may be required to guarantee extent alignment and
granularity.

For example, for atomic writes, the maximum atomic write unit size would
be limited at the extent alignment and granularity, guaranteeing that an
atomic write would not span data present in multiple extents.

forcealign may be useful as a performance tuning optimization in other
scenarios.

Early development xfsprogs support is at:
https://github.com/johnpgarry/xfsprogs-dev/commits/atomic-writes/

Differences to v1:
- Add Darricks RB tags (thanks)
- Disallow mount for forcealign and RT
- Disallow cp --reflink from forcealign inode
- Comments improvements (Darrick)
- Coding style improvements (Darrick)
- Fix xfs_inode_alloc_unitsize() (Darrick)

Baseline:
xfs/for-next @ 3ba3ab1f6719 ("xfs: enable FITRIM on the realtime device")

[0] https://lore.kernel.org/linux-xfs/20240607143919.2622319-1-john.g.garry@oracle.com/
[1] https://lore.kernel.org/linux-block/20240620125359.2684798-1-john.g.garry@oracle.com/

Darrick J. Wong (2):
xfs: Introduce FORCEALIGN inode flag
xfs: Enable file data forcealign feature

Dave Chinner (6):
xfs: only allow minlen allocations when near ENOSPC
xfs: always tail align maxlen allocations
xfs: simplify extent allocation alignment
xfs: make EOF allocation simpler
xfs: introduce forced allocation alignment
xfs: align args->minlen for forced allocation alignment

John Garry (5):
xfs: Do not free EOF blocks for forcealign
xfs: Update xfs_inode_alloc_unitsize() for forcealign
xfs: Unmap blocks according to forcealign
xfs: Only free full extents for forcealign
xfs: Don't revert allocated offset for forcealign

fs/xfs/libxfs/xfs_alloc.c | 33 ++--
fs/xfs/libxfs/xfs_alloc.h | 3 +-
fs/xfs/libxfs/xfs_bmap.c | 321 +++++++++++++++++++---------------
fs/xfs/libxfs/xfs_format.h | 9 +-
fs/xfs/libxfs/xfs_ialloc.c | 12 +-
fs/xfs/libxfs/xfs_inode_buf.c | 55 ++++++
fs/xfs/libxfs/xfs_inode_buf.h | 3 +
fs/xfs/libxfs/xfs_sb.c | 2 +
fs/xfs/xfs_bmap_util.c | 14 +-
fs/xfs/xfs_inode.c | 17 +-
fs/xfs/xfs_inode.h | 23 +++
fs/xfs/xfs_ioctl.c | 51 +++++-
fs/xfs/xfs_mount.h | 2 +
fs/xfs/xfs_reflink.c | 5 +-
fs/xfs/xfs_reflink.h | 10 --
fs/xfs/xfs_super.c | 11 ++
fs/xfs/xfs_trace.h | 8 +-
include/uapi/linux/fs.h | 2 +
18 files changed, 392 insertions(+), 189 deletions(-)

--
2.31.1