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ovl: allow remote upper

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No reason to prevent upper layer being a remote filesystem.  Do the
revalidation in that case, just as we already do for lower layers.

This lets virtiofs be used as upper layer, which appears to be a real use
case.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2020-03-17 15:04:22 +01:00
parent f428884456
commit bccece1ead
3 changed files with 9 additions and 4 deletions
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3
fs/overlayfs/namei.c
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@@ -845,8 +845,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
if (err)
goto out;
if (upperdentry && (upperdentry->d_flags & DCACHE_OP_REAL ||
unlikely(ovl_dentry_remote(upperdentry)))) {
if (upperdentry && upperdentry->d_flags & DCACHE_OP_REAL) {
dput(upperdentry);
err = -EREMOTE;
goto out;