diff options
Diffstat (limited to 'fs/overlayfs/super.c')
| -rw-r--r-- | fs/overlayfs/super.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 28b2f707cfbc..ba9146f22a2c 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -128,9 +128,17 @@ static int ovl_dentry_revalidate_common(struct dentry *dentry, unsigned int i; int ret = 1; - /* Careful in RCU mode */ - if (!inode) + if (!inode) { + /* + * Lookup of negative dentries will call ovl_dentry_init_flags() + * with NULL upperdentry and NULL oe, resulting in the + * DCACHE_OP*_REVALIDATE flags being cleared. Hence the only + * way to get a negative inode is due to a race with dentry + * destruction. + */ + WARN_ON(!(flags & LOOKUP_RCU)); return -ECHILD; + } oe = OVL_I_E(inode); lowerstack = ovl_lowerstack(oe); |