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fuse: add WARN_ON and comment for RCU revalidate

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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2025-11-03 14:10:38 +01:00
parent 2a36511609
commit 66c6a77e00
1 changed files with 10 additions and 2 deletions
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12
fs/overlayfs/super.c
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@@ -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);