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Merge tag 'for-7.2-rc6-fixup-worker-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

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Pull Btrfs Fixes 2: Electric Boogaloo from David Sterba:
 "This brings back the fixup worker infrastructure.

  It's a mechanism to detect pages/folios that are marked dirty without
  filesystem knowledge and require COW fixup. The consequence of not
  doing so is silent data loss.

  The first patch covers the scenarios in detail, also reflecting folio
  API port and subpage block size support added in recent years. The
  original fixup worker was only for pages.

  The patch is relatively big, half of the code is debugging and support
  code, the rest is the core design around the detection and fix.

  The second patch handles an unlikely case when there's work left
  during unmount"

* tag 'for-7.2-rc6-fixup-worker-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: flush the fixup workers during close_ctree
  btrfs: trigger cow fixup via dirty_folio()
This commit is contained in:
Linus Torvalds
2026-08-06 13:29:15 -07:00
parent 6335463488 ae2567b11c
commit 6c68fa601b
8 changed files with 651 additions and 12 deletions
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35
include/trace/events/btrfs.h
View File

@@ -689,6 +689,41 @@ DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup_first,
TP_ARGS(inode, ordered)
);
/*
* The writepage fixup worker deferred a block because this still-running
* ordered extent covers it.
*/
DEFINE_EVENT(btrfs__ordered_extent, btrfs_writepage_fixup_defer,
TP_PROTO(const struct btrfs_inode *inode,
const struct btrfs_ordered_extent *ordered),
TP_ARGS(inode, ordered)
);
/* The writepage fixup worker reserved space for a block and set delalloc. */
TRACE_EVENT(btrfs_writepage_fixup_reserve,
TP_PROTO(const struct btrfs_inode *inode, u64 start, u32 len),
TP_ARGS(inode, start, len),
TP_STRUCT__entry_btrfs(
__field( u64, ino )
__field( u64, start )
__field( u32, len )
),
TP_fast_assign_btrfs(inode->root->fs_info,
__entry->ino = btrfs_ino(inode);
__entry->start = start;
__entry->len = len;
),
TP_printk_btrfs("ino=%llu start=%llu len=%u",
__entry->ino, __entry->start, __entry->len)
);
DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_split,
TP_PROTO(const struct btrfs_inode *inode,