Btrfs: fix defragmentation regression
There's an off-by-one bug:
# create a file with lots of 4K file extents
# btrfs fi defrag /mnt/file
# sync
# filefrag -v /mnt/file
Filesystem type is: 9123683e
File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 3372 64
1 64 3136 3435 1
2 65 3436 3136 64
3 129 3201 3499 1
4 130 3500 3201 64
5 194 3266 3563 1
6 195 3564 3266 64
7 259 3331 3627 1
8 260 3628 3331 40 eof
After this patch:
...
# filefrag -v /mnt/file
Filesystem type is: 9123683e
File size of /mnt/file is 1228800 (300 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 3372 300 eof
/mnt/file: 1 extent found
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
1 file changed