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ovl: separate detection of remote upper layer from stacked overlay

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Following patch will allow remote as upper layer, but not overlay stacked
on upper layer.  Separate the two concepts.

This patch is doesn't change behavior.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-03-17 15:04:22 +01:00
parent 3bb7df928a
commit 7925dad839
3 changed files with 10 additions and 10 deletions
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3
fs/overlayfs/namei.c
View File

@ -845,7 +845,8 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
if (err)
goto out;
if (upperdentry && unlikely(ovl_dentry_remote(upperdentry))) {
if (upperdentry && (upperdentry->d_flags & DCACHE_OP_REAL ||
unlikely(ovl_dentry_remote(upperdentry)))) {
dput(upperdentry);
err = -EREMOTE;
goto out;

14
fs/overlayfs/super.c
View File

@ -752,13 +752,13 @@ static int ovl_mount_dir(const char *name, struct path *path)
ovl_unescape(tmp);
err = ovl_mount_dir_noesc(tmp, path);
if (!err)
if (ovl_dentry_remote(path->dentry)) {
pr_err("filesystem on '%s' not supported as upperdir\n",
tmp);
path_put_init(path);
err = -EINVAL;
}
if (!err && (ovl_dentry_remote(path->dentry) ||
path->dentry->d_flags & DCACHE_OP_REAL)) {
pr_err("filesystem on '%s' not supported as upperdir\n",
tmp);
path_put_init(path);
err = -EINVAL;
}
kfree(tmp);
}
return err;

3
fs/overlayfs/util.c
View File

@ -93,8 +93,7 @@ struct ovl_entry *ovl_alloc_entry(unsigned int numlower)
bool ovl_dentry_remote(struct dentry *dentry)
{
return dentry->d_flags &
(DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE |
DCACHE_OP_REAL);
(DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
}
bool ovl_dentry_weird(struct dentry *dentry)