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[v3,0/2] btrfs: some fiemap fixes

Message ID cover.1708730657.git.fdmanana@suse.com (mailing list archive)
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Series btrfs: some fiemap fixes | expand

Message

Filipe Manana Feb. 23, 2024, 11:47 p.m. UTC 
From: Filipe Manana <fdmanana@suse.com>

There's a recent regression with fiemap due to a fix for a deadlock between
fiemap and memory mapped writes when the fiemap buffer is memory mapped to
the same file range, which leads to a race triggering a warning and making
fiemap fail. Plus one more long standing race when using FIEMAP_FLAG_SYNC.
Details in the change logs.

V3: Deal with the case where offset == cache->offset which is also
    possible if we had delalloc in the range of a hole or prealloc extent.

V2: Updated patch 1/2 to deal with the case of a hole/prealloc extent
    with multiple delalloc ranges inside it.

Filipe Manana (2):
  btrfs: fix race between ordered extent completion and fiemap
  btrfs: ensure fiemap doesn't race with writes when FIEMAP_FLAG_SYNC is given

 fs/btrfs/extent_io.c | 59 ++++++++++++++++++++++++++++++--------------
 fs/btrfs/inode.c     | 22 ++++++++++++++++-
 2 files changed, 61 insertions(+), 20 deletions(-)