linux-kernel - [PATCH 03/16] vfs: do_last(): inline walk

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Date:	Mon, 21 May 2012 17:30:07 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	viro@...IV.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, torvalds@...ux-foundation.org, mszeredi@...e.cz
Subject: [PATCH 03/16] vfs: do_last(): inline walk_component()

From: Miklos Szeredi <mszeredi@...e.cz>

Copy walk_component() into do_lookup().

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
---
 fs/namei.c |   35 ++++++++++++++++++++++++++++++-----
 1 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index d55ef9e..1b1a83f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2202,6 +2202,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 	int want_write = 0;
 	int acc_mode = op->acc_mode;
 	struct file *filp;
+	struct inode *inode;
 	int error;
 
 	nd->flags &= ~LOOKUP_PARENT;
@@ -2239,12 +2240,36 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 		if (open_flag & O_PATH && !(nd->flags & LOOKUP_FOLLOW))
 			symlink_ok = 1;
 		/* we _can_ be in RCU mode here */
-		error = walk_component(nd, path, &nd->last, LAST_NORM,
-					!symlink_ok);
-		if (error < 0)
-			return ERR_PTR(error);
-		if (error) /* symlink */
+		error = lookup_fast(nd, &nd->last, path, &inode);
+		if (unlikely(error)) {
+			if (error < 0)
+				goto exit;
+
+			error = lookup_slow(nd, &nd->last, path);
+			if (error < 0)
+				goto exit;
+
+			inode = path->dentry->d_inode;
+		}
+		error = -ENOENT;
+		if (!inode) {
+			path_to_nameidata(path, nd);
+			goto exit;
+		}
+
+		if (should_follow_link(inode, !symlink_ok)) {
+			if (nd->flags & LOOKUP_RCU) {
+				if (unlikely(unlazy_walk(nd, path->dentry))) {
+					error = -ECHILD;
+					goto exit;
+				}
+			}
+			BUG_ON(inode != path->dentry->d_inode);
 			return NULL;
+		}
+		path_to_nameidata(path, nd);
+		nd->inode = inode;
+
 		/* sayonara */
 		error = complete_walk(nd);
 		if (error)
-- 
1.7.7

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