From d95fd91c1ac1f551909ccdc4fcc80159521d0ef5 Mon Sep 17 00:00:00 2001 From: Fan Li Date: Tue, 13 Sep 2016 11:35:42 +0800 Subject: [PATCH] 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 Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 40fe72e..d400380a 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -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)) { -- 2.7.4