bring back RT delalloc support v5

Christoph Hellwig
2024-03-27T11:03:22Z

Hi all,

this series adds back delalloc support for RT inodes, at least if the RT
extent size is a single file system block. This shows really nice
performance improvements for workloads that frequently rewrite or append
to files, and improves fragmentation for larger writes. On other
workloads it sometimes shows small performance improvements or flat
performance.

Changes since v4:
- fix a bug in the fix for splitting RT delalloc reservations
- rework where rtbitmap locking happens in the bunmapi patch to
avoid churn with a series in development, stealing a patch from
Darrick's giant patch queue in the process

Changes since v3:
- fix a bug in splitting RT delalloc reservations
- fix online repair of RT delalloc fscounters
- adjust the freespace counter refactoing to play nicer with an
upcoming series of mine

Changes since v3:
- drop gratuitous changes to xfs_mod_freecounter/xfs_add_freecounter
that caused a warning to be logged when it shouldn't.
- track delalloc rtextents instead of rtblocks in xfs_mount
- fix commit message spelling an typos

Changes since v2:
- keep casting to int64_t for xfs_mod_delalloc
- add a patch to clarify and assert that the block delta in
xfs_trans_unreserve_and_mod_sb can only be positive

Diffstat:
libxfs/xfs_ag.c | 4 -
libxfs/xfs_ag_resv.c | 24 +------
libxfs/xfs_ag_resv.h | 2
libxfs/xfs_alloc.c | 4 -
libxfs/xfs_bmap.c | 152 ++++++++++++++++++++++------------------------
libxfs/xfs_rtbitmap.c | 57 +++++++++++++++++
libxfs/xfs_rtbitmap.h | 17 +++++
libxfs/xfs_shared.h | 6 +
scrub/common.c | 1
scrub/fscounters.c | 12 ++-
scrub/fscounters.h | 1
scrub/fscounters_repair.c | 3
scrub/repair.c | 5 -
xfs_fsmap.c | 4 -
xfs_fsops.c | 29 ++------
xfs_fsops.h | 2
xfs_inode.c | 3
xfs_iomap.c | 44 +++++++++----
xfs_iops.c | 2
xfs_mount.c | 85 +++++++++++++++----------
xfs_mount.h | 36 ++++++++--
xfs_rtalloc.c | 22 ++----
xfs_super.c | 17 +++--
xfs_trace.h | 1
xfs_trans.c | 63 +++++++++----------
25 files changed, 348 insertions(+), 248 deletions(-)