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authorTheodore Ts'o <tytso@mit.edu>2009-09-28 15:58:29 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-09-28 15:58:29 -0400
commitf3ce8064b388ccf420012c5a4907aae4f13fe9d0 (patch)
tree3d0cbfffc75ea698726d71c06c9b0be82982d6eb /fs/ext4/move_extent.c
parent8d5d02e6b176565c77ff03604908b1453a22044d (diff)
ext4: EXT4_IOC_MOVE_EXT: Check for different original and donor inodes first
Move the check to make sure the original and donor inodes are different earlier, to avoid a potential deadlock by trying to lock the same inode twice. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/move_extent.c')
-rw-r--r--fs/ext4/move_extent.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 5332fd4c402..25b6b145736 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -1001,14 +1001,6 @@ mext_check_arguments(struct inode *orig_inode,
return -EINVAL;
}
- /* orig and donor should be different file */
- if (orig_inode->i_ino == donor_inode->i_ino) {
- ext4_debug("ext4 move extent: The argument files should not "
- "be same file [ino:orig %lu, donor %lu]\n",
- orig_inode->i_ino, donor_inode->i_ino);
- return -EINVAL;
- }
-
/* Ext4 move extent supports only extent based file */
if (!(EXT4_I(orig_inode)->i_flags & EXT4_EXTENTS_FL)) {
ext4_debug("ext4 move extent: orig file is not extents "
@@ -1232,6 +1224,14 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
int block_len_in_page;
int uninit;
+ /* orig and donor should be different file */
+ if (orig_inode->i_ino == donor_inode->i_ino) {
+ ext4_debug("ext4 move extent: The argument files should not "
+ "be same file [ino:orig %lu, donor %lu]\n",
+ orig_inode->i_ino, donor_inode->i_ino);
+ return -EINVAL;
+ }
+
/* protect orig and donor against a truncate */
ret1 = mext_inode_double_lock(orig_inode, donor_inode);
if (ret1 < 0)