cifs: switch to ->iterate_shared()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/cifs/cifsfs.c

@@ -1083,7 +1083,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
 };
 
 const struct file_operations cifs_dir_ops = {
-	.iterate = cifs_readdir,
+	.iterate_shared = cifs_readdir,
 	.release = cifs_closedir,
 	.read    = generic_read_dir,
 	.unlocked_ioctl  = cifs_ioctl,

fs/cifs/readdir.c

@@ -80,18 +80,32 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,
 	struct inode *inode;
 	struct super_block *sb = parent->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 
 	cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
 
 	dentry = d_hash_and_lookup(parent, name);
+	if (!dentry) {
+		/*
+		 * If we know that the inode will need to be revalidated
+		 * immediately, then don't create a new dentry for it.
+		 * We'll end up doing an on the wire call either way and
+		 * this spares us an invalidation.
+		 */
+		if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
+			return;
+retry:
+		dentry = d_alloc_parallel(parent, name, &wq);
+	}
 	if (IS_ERR(dentry))
 		return;
-
-	if (dentry) {
+	if (!d_in_lookup(dentry)) {
 		inode = d_inode(dentry);
 		if (inode) {
-			if (d_mountpoint(dentry))
-				goto out;
+			if (d_mountpoint(dentry)) {
+				dput(dentry);
+				return;
+			}
 			/*
 			 * If we're generating inode numbers, then we don't
 			 * want to clobber the existing one with the one that
@@ -106,33 +120,22 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,
 			    (inode->i_mode & S_IFMT) ==
 			    (fattr->cf_mode & S_IFMT)) {
 				cifs_fattr_to_inode(inode, fattr);
-				goto out;
+				dput(dentry);
+				return;
 			}
 		}
 		d_invalidate(dentry);
 		dput(dentry);
+		goto retry;
+	} else {
+		inode = cifs_iget(sb, fattr);
+		if (!inode)
+			inode = ERR_PTR(-ENOMEM);
+		alias = d_splice_alias(inode, dentry);
+		d_lookup_done(dentry);
+		if (alias && !IS_ERR(alias))
+			dput(alias);
 	}
-
-	/*
-	 * If we know that the inode will need to be revalidated immediately,
-	 * then don't create a new dentry for it. We'll end up doing an on
-	 * the wire call either way and this spares us an invalidation.
-	 */
-	if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
-		return;
-
-	dentry = d_alloc(parent, name);
-	if (!dentry)
-		return;
-
-	inode = cifs_iget(sb, fattr);
-	if (!inode)
-		goto out;
-
-	alias = d_splice_alias(inode, dentry);
-	if (alias && !IS_ERR(alias))
-		dput(alias);
-out:
 	dput(dentry);
 }