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| author | Jan Kara <jack@suse.cz> | 2023-07-03 17:49:11 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-07-04 11:20:29 +0300 |
| commit | 66d8fc0539b0d49941f313c9509a8384e4245ac1 (patch) | |
| tree | c36dd9b005b86362713f844e8c13cc952afdbac7 /fs/namei.c | |
| parent | 24be4d0b46bb0c3c1dc7bacd30957d6144a70dfc (diff) | |
| download | linux-66d8fc0539b0d49941f313c9509a8384e4245ac1.tar.xz | |
fs: no need to check source
The @source inode must be valid. It is even checked via IS_SWAPFILE()
above making it pretty clear. So no need to check it when we unlock.
What doesn't need to exist is the @target inode. The lock_two_inodes()
helper currently swaps the @inode1 and @inode2 arguments if @inode1 is
NULL to have consistent lock class usage. However, we know that at least
for vfs_rename() that @inode1 is @source and thus is never NULL as per
above. We also know that @source is a different inode than @target as
that is checked right at the beginning of vfs_rename(). So we know that
@source is valid and locked and that @target is locked. So drop the
check whether @source is non-NULL.
Fixes: 28eceeda130f ("fs: Lock moved directories")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202307030026.9sE2pk2x-lkp@intel.com
Message-Id: <20230703-vfs-rename-source-v1-1-37eebb29b65b@kernel.org>
[brauner: use commit message from patch I sent concurrently]
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c index 91171da719c5..e56ff39a79bc 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4874,8 +4874,7 @@ int vfs_rename(struct renamedata *rd) d_exchange(old_dentry, new_dentry); } out: - if (source) - inode_unlock(source); + inode_unlock(source); if (target) inode_unlock(target); dput(new_dentry); |