Commit d95fd91c authored Sep 13, 2016 by Fan Li Committed by Jaegeuk Kim Sep 14, 2016

f2fs: exclude special cases for f2fs_move_file_range



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>

parent 649d7df2

fs/f2fs/file.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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)) {

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