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f2fs: exclude special cases for f2fs_move_file_range

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When src and dst is the same file, and the latter part of source region
overlaps with the former part of destination region, current implement
will overwrite data which hasn't been moved yet and truncate data in
overlapped region.
This patch return -EINVAL when such cases occur and return 0 when
source region and destination region is actually the same part of
the same file.

Signed-off-by: Fan li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fan Li 2016-09-13 11:35:42 +08:00 committed by Jaegeuk Kim
parent 649d7df29c
commit d95fd91c1a
1 changed files with 7 additions and 0 deletions
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7
fs/f2fs/file.c
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@ -2092,6 +2092,13 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
if (f2fs_encrypted_inode(src) || f2fs_encrypted_inode(dst))
return -EOPNOTSUPP;
if (src == dst) {
if (pos_in == pos_out)
return 0;
if (pos_out > pos_in && pos_out < pos_in + len)
return -EINVAL;
}
inode_lock(src);
if (src != dst) {
if (!inode_trylock(dst)) {