Enable the vfs_utimes() helper to handle idmapped mounts by passing down
the mount's user namespace.

Cc: Christoph Hellwig <h...@lst.de>
Cc: David Howells <dhowe...@redhat.com>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Cc: linux-fsde...@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
---
/* v2 */
unchanged
---
 fs/utimes.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/utimes.c b/fs/utimes.c
index 1a4130bee157..ead17d623aaa 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -22,6 +22,7 @@ int vfs_utimes(const struct path *path, struct timespec64 
*times)
        struct iattr newattrs;
        struct inode *inode = path->dentry->d_inode;
        struct inode *delegated_inode = NULL;
+       struct user_namespace *user_ns;
 
        if (times) {
                if (!nsec_valid(times[0].tv_nsec) ||
@@ -61,8 +62,9 @@ int vfs_utimes(const struct path *path, struct timespec64 
*times)
                newattrs.ia_valid |= ATTR_TOUCH;
        }
 retry_deleg:
+       user_ns = mnt_user_ns(path->mnt);
        inode_lock(inode);
-       error = notify_change(&init_user_ns, path->dentry, &newattrs, 
&delegated_inode);
+       error = notify_change(user_ns, path->dentry, &newattrs, 
&delegated_inode);
        inode_unlock(inode);
        if (delegated_inode) {
                error = break_deleg_wait(&delegated_inode);
-- 
2.29.2

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