Btrfs: Fix race in btrfs_mark_extent_written

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When extent needs to be split, btrfs_mark_extent_written truncates the extent
first, then inserts a new extent and increases the reference count.

The race happens if someone else deletes the old extent before the new extent
is inserted. The fix here is increase the reference count in advance. This race
is similar to the race in btrfs_drop_extents that was recently fixed.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

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Yan Zheng 2008-11-12 14:19:50 -05:00 • committed by Chris Mason

parent 2b82032c34

commit c36047d729

1 changed files with 14 additions and 4 deletions

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fs/btrfs/file.c

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