linux-kernel - [PATCH 00/13] forcealign for xfs

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Date: Fri, 21 Jun 2024 10:05:27 +0000
From: John Garry <john.g.garry@...cle.com>
To: chandan.babu@...cle.com, djwong@...nel.org, dchinner@...hat.com,
        hch@....de
Cc: viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, catherine.hoang@...cle.com,
        martin.petersen@...cle.com, John Garry <john.g.garry@...cle.com>
Subject: [PATCH 00/13] forcealign for xfs

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 at [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/tree/forcealign_and_atomicwrites_for_v4_xfs_block_atomic_writes

Catherine has been working on a formal version of this support, which
I need to update to.

Baseline:
xfs/for-next @ 348a1983cf4c ("xfs: fix unlink vs cluster buffer
instantiation race")
+ https://lore.kernel.org/linux-xfs/20240528171510.3562654-1-john.g.garry@oracle.com/

[0] https://lore.kernel.org/linux-xfs/20240607143919.2622319-1-john.g.garry@oracle.com/
[1] https://lore.kernel.org/linux-nvme/20240620125359.2684798-1-john.g.garry@oracle.com/T/#m4ab84ddd627d95e6e957b62c29bbf815ca6e44e2

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_fsb() 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      | 313 +++++++++++++++++++---------------
 fs/xfs/libxfs/xfs_format.h    |   9 +-
 fs/xfs/libxfs/xfs_ialloc.c    |  12 +-
 fs/xfs/libxfs/xfs_inode_buf.c |  53 ++++++
 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            |  15 ++
 fs/xfs/xfs_inode.h            |  23 +++
 fs/xfs/xfs_ioctl.c            |  47 ++++-
 fs/xfs/xfs_mount.h            |   2 +
 fs/xfs/xfs_reflink.h          |  10 --
 fs/xfs/xfs_super.c            |   4 +
 fs/xfs/xfs_trace.h            |   8 +-
 include/uapi/linux/fs.h       |   2 +
 17 files changed, 371 insertions(+), 182 deletions(-)

-- 
2.31.1