diff options
| -rw-r--r-- | fs/overlayfs/inode.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 94d2f8a8b779..96587075db11 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -105,12 +105,20 @@ int ovl_getattr(const struct path *path, struct kstat *stat, * Lower hardlinks may be broken on copy up to different * upper files, so we cannot use the lower origin st_ino * for those different files, even for the same fs case. + * + * Similarly, several redirected dirs can point to the + * same dir on a lower layer. With the "verify_lower" + * feature, we do not use the lower origin st_ino, if + * we haven't verified that this redirect is unique. + * * With inodes index enabled, it is safe to use st_ino - * of an indexed hardlinked origin. The index validates - * that the upper hardlink is not broken. + * of an indexed origin. The index validates that the + * upper hardlink is not broken and that a redirected + * dir is the only redirect to that origin. */ - if (is_dir || lowerstat.nlink == 1 || - ovl_test_flag(OVL_INDEX, d_inode(dentry))) + if (ovl_test_flag(OVL_INDEX, d_inode(dentry)) || + (!ovl_verify_lower(dentry->d_sb) && + (is_dir || lowerstat.nlink == 1))) stat->ino = lowerstat.ino; if (samefs) |