From: Robbie Ko <robbieko@xxxxxxxxxxxx>
This patchset intends to fix btrfs fiemap related bug.
The fiemap has the following problems:
1) Wrong extent count when fm_extent_count is zero.
2) SHARED bit is not correct
I have two ideas, but I do not know which one is the best.
Like:
# dd if=/dev/zero bs=16K count=2 oflag=dsync of=/mnt/btrfs/file
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/btrfs/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..63]: 4241424..4241487 64 0x1
# cloner -s $((16*1024)) /mnt/btrfs/file /mnt/btrfs/file_clone
1. When any extent is shared in extent map, the entire extent map is shared
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/btrfs/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..63]: 4241424..4241487 64 0x2001
2. Split into different extent
# xfs_io -c "fiemap -v" /mnt/btrfs/file
/mnt/btrfs/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..31]: 4241424..4241455 32 0x0
1: [32..63]: 4241456..4241487 32 0x2001
Robbie Ko (2):
Btrfs: fiemap: pass correct bytenr when fm_extent_count is zero
Btrfs: fix fiemap extent SHARED flag error with range clone.
fs/btrfs/extent_io.c | 150 ++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 132 insertions(+), 18 deletions(-)
--
1.9.1
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