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NFS: Sillyrename: in the case of a race, check aliases are really positive

In nfs_do_call_unlink() we check that we haven't raced, and that lookup()
hasn't created an aliased dentry to our sillydeleted dentry. If somebody
has deleted the file on the server and the lookup() resulted in a negative
dentry, then ignore...

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Trond Myklebust 17 роки тому
батько
коміт
609005c319
1 змінених файлів з 3 додано та 1 видалено
  1. 3 1
      fs/nfs/unlink.c

+ 3 - 1
fs/nfs/unlink.c

@@ -130,13 +130,15 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
 	alias = d_lookup(parent, &data->args.name);
 	if (alias != NULL) {
 		int ret = 0;
+
 		/*
 		 * Hey, we raced with lookup... See if we need to transfer
 		 * the sillyrename information to the aliased dentry.
 		 */
 		nfs_free_dname(data);
 		spin_lock(&alias->d_lock);
-		if (!(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
+		if (alias->d_inode != NULL &&
+		    !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
 			alias->d_fsdata = data;
 			alias->d_flags |= DCACHE_NFSFS_RENAMED;
 			ret = 1;