[PATCH v5 00/10] speculative preallocation inode tracking

[Brian Foster <bfoster@redhat.com>]

Hi all,

This is v3 of the speculative preallocation inode tracking patchset. This
functionality tracks inodes with post-EOF speculative preallocation for the
purpose of background and on-demand trimming.

Background scanning occurs on a longish interval (5 minutes by default) and in
a best-effort mode (i.e., inodes are skipped due to lock contention or dirty
cache). The intent is to clear up post-EOF blocks on inodes that might have
allocations hanging around due to open-write-close sequences (NFS).

On demand scanning is provided via a new ioctl and supports various parameters
such as scan mode, filtering by quota id and minimum file size. A pending use
case for on demand scanning is for accurate quota accounting via the gluster
scale out filesystem (i.e., to free up preallocated space when near a usage
limit).

Brian

v5:
- Rebased against the die-xfssyncd-die patchset.
- Renamed xfs_inodes_free_eofblocks() to xfs_icache_free_eofblocks().
- Migrated xfs_can_free_eofblocks() from static inline to xfs_inode.c.
- Fixed xfs_eofblocks version field and added version check to ioctl().
- Reworked quota filtering to use standard quota fields. Added patch 7 to
  support.
- Split min. file size filtering into a separate patch.
- Reworked background scanning based on rebase. Created a new eofblocks
  workqueue, renamed the tunable and based its value in seconds.

v4:
- Fix the broken need_iolock parameter to the xfs_free_eofblocks() call in
  patch 5 (thanks to Ben M. for testing). This is a one line change. All
  other patches equivalent to v3. This version survives an xfstests run (with
  XFS_DEBUG enabled this time :P).

v3:
- Pushed dirty cache check up into patch 5 (minor clean up).
- Reworked xfs_can_free_eofblocks() in patch 3 as per Dave C.'s review.
- Rebased from linus' tree to the XFS tree.

v2:
- Remove unnecessary inode flag clear helper.
- Condense eofblocks set/clear tag functions.
- Move clear tag call into xfs_free_eofblocks().
- Modify AG walk infrastructure to support tag-based walk and utilize this
  functionality for the eofblocks scan (as opposed to the previous code
  duplicated from reclaim scanning).
- Improve ioctl functionality: new data structure fields/flags, validate quota
  is enabled.
- Increase default background scanning interval to 5 minutes, add tunable.

Brian Foster (10):
  xfs: add EOFBLOCKS inode tagging/untagging
  xfs: support a tag-based inode_ag_iterator
  xfs: create helper to check whether to free eofblocks on inode
  xfs: make xfs_free_eofblocks() non-static, return EAGAIN on trylock
    failure
  xfs: create function to scan and clear EOFBLOCKS inodes
  xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl
  xfs: make xfs_quota_type() non-static
  xfs: add quota id filtering to eofblocks scan
  xfs: add minimum file size filtering to eofblocks scan
  xfs: add background scanning to clear eofblocks inodes

 fs/xfs/xfs_ag.h          |    1 +
 fs/xfs/xfs_fs.h          |   20 ++++
 fs/xfs/xfs_globals.c     |    1 +
 fs/xfs/xfs_icache.c      |  220 ++++++++++++++++++++++++++++++++++++++++++++--
 fs/xfs/xfs_icache.h      |   12 ++-
 fs/xfs/xfs_inode.c       |   37 ++++++++
 fs/xfs/xfs_inode.h       |    1 +
 fs/xfs/xfs_ioctl.c       |   24 +++++
 fs/xfs/xfs_iomap.c       |    8 ++
 fs/xfs/xfs_iops.c        |    4 +
 fs/xfs/xfs_linux.h       |    1 +
 fs/xfs/xfs_mount.c       |    2 +
 fs/xfs/xfs_mount.h       |    3 +
 fs/xfs/xfs_qm_syscalls.c |    5 +-
 fs/xfs/xfs_quota.h       |    1 +
 fs/xfs/xfs_quotaops.c    |    2 +-
 fs/xfs/xfs_super.c       |    9 ++
 fs/xfs/xfs_sysctl.c      |    9 ++
 fs/xfs/xfs_sysctl.h      |    1 +
 fs/xfs/xfs_trace.h       |    6 ++
 fs/xfs/xfs_vnodeops.c    |   27 +++---
 fs/xfs/xfs_vnodeops.h    |    1 +
 22 files changed, 368 insertions(+), 27 deletions(-)

-- 
1.7.7.6

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