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cifs: release cached dentries only if mount is complete 

During cifs_kill_sb, we first dput all the dentries that we have cached.
However this function can also get called for mount failures.
So dput the cached dentries only if the filesystem mount is complete.
i.e. cifs_sb->root is populated.

Fixes: 5e9c89d43f ("cifs: Grab a reference for the dentry of the cached directory during the lifetime of the cache")
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Shyam Prasad N 2022-04-01 06:25:17 +00:00 committed by Steve French
parent 994fd530a5
commit d788e51636
1 changed files with 15 additions and 13 deletions
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28
fs/cifs/cifsfs.c
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@ -266,22 +266,24 @@ static void cifs_kill_sb(struct super_block *sb)
* before we kill the sb.
*/
if (cifs_sb->root) {
node = rb_first(root);
while (node != NULL) {
tlink = rb_entry(node, struct tcon_link, tl_rbnode);
tcon = tlink_tcon(tlink);
cfid = &tcon->crfid;
mutex_lock(&cfid->fid_mutex);
if (cfid->dentry) {
dput(cfid->dentry);
cfid->dentry = NULL;
}
mutex_unlock(&cfid->fid_mutex);
node = rb_next(node);
}
/* finally release root dentry */
dput(cifs_sb->root);
cifs_sb->root = NULL;
}
node = rb_first(root);
while (node != NULL) {
tlink = rb_entry(node, struct tcon_link, tl_rbnode);
tcon = tlink_tcon(tlink);
cfid = &tcon->crfid;
mutex_lock(&cfid->fid_mutex);
if (cfid->dentry) {
dput(cfid->dentry);
cfid->dentry = NULL;
}
mutex_unlock(&cfid->fid_mutex);
node = rb_next(node);
}
kill_anon_super(sb);
cifs_umount(cifs_sb);