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udf_rename(): only access the child content on cross-directory rename

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[ Upstream commit 9d35cebb794bb7be93db76c3383979c7deacfef9 ]

We can't really afford locking the source on same-directory rename;
currently vfs_rename() tries to do that, but it will have to be
changed.  The logics in udf_rename() is lazy and goes looking for
".." in source even in same-directory case.  It's not hard to get
rid of that, leaving that behaviour only for cross-directory case;
that VFS can get locks safely (and will keep doing that after the
coming changes).

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Stable-dep-of: 6756af923e06 ("udf: Verify inode link counts before performing rename")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Al Viro
2023-10-17 14:44:23 -04:00
committed by Greg Kroah-Hartman
parent d33523b0be
commit 17b312c5d8
1 changed files with 6 additions and 1 deletions
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7
fs/udf/namei.c
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@@ -770,7 +770,7 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
struct inode *old_inode = d_inode(old_dentry);
struct inode *new_inode = d_inode(new_dentry);
struct udf_fileident_iter oiter, niter, diriter;
bool has_diriter = false;
bool has_diriter = false, is_dir = false;
int retval;
struct kernel_lb_addr tloc;
@@ -793,6 +793,9 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
if (!empty_dir(new_inode))
goto out_oiter;
}
is_dir = true;
}
if (is_dir && old_dir != new_dir) {
retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
&diriter);
if (retval == -ENOENT) {
@@ -880,7 +883,9 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
cpu_to_lelb(UDF_I(new_dir)->i_location);
udf_fiiter_write_fi(&diriter, NULL);
udf_fiiter_release(&diriter);
}
if (is_dir) {
inode_dec_link_count(old_dir);
if (new_inode)
inode_dec_link_count(new_inode);