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ovl: check that upperdir path is not on a read-only mount

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So far we only checked that sb is not read-only.

Suggested-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2021-04-08 14:30:20 +03:00 committed by Miklos Szeredi
parent 1f0cb8bcc7
commit e21a6c57e3
1 changed files with 2 additions and 2 deletions
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4
fs/overlayfs/super.c
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@ -1185,8 +1185,8 @@ static int ovl_get_upper(struct super_block *sb, struct ovl_fs *ofs,
if (err)
goto out;
/* Upper fs should not be r/o */
if (sb_rdonly(upperpath->mnt->mnt_sb)) {
/* Upperdir path should not be r/o */
if (__mnt_is_readonly(upperpath->mnt)) {
pr_err("upper fs is r/o, try multi-lower layers mount\n");
err = -EINVAL;
goto out;