linux-kernel - [PATCH v3 087/110] namei: get rid of nameidata->base

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Message-Id: <1431367690-5223-87-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Mon, 11 May 2015 19:07:47 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Neil Brown <neilb@...e.de>, Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v3 087/110] namei: get rid of nameidata->base

From: Al Viro <viro@...iv.linux.org.uk>

we can do fdput() under rcu_read_lock() just fine; all we need to take
care of is fetching nd->inode value first.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 6f95bc9..497d5f4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -503,7 +503,6 @@ struct nameidata {
 	int		last_type;
 	unsigned	depth;
 	int		total_link_count;
-	struct file	*base;
 	struct saved {
 		struct path link;
 		void *cookie;
@@ -1872,7 +1871,6 @@ static int path_init(int dfd, const struct filename *name, unsigned int flags,
 	nd->last_type = LAST_ROOT; /* if there are only slashes... */
 	nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT;
 	nd->depth = 0;
-	nd->base = NULL;
 	if (flags & LOOKUP_ROOT) {
 		struct dentry *root = nd->root.dentry;
 		struct inode *inode = root->d_inode;
@@ -1941,14 +1939,15 @@ static int path_init(int dfd, const struct filename *name, unsigned int flags,
 
 		nd->path = f.file->f_path;
 		if (flags & LOOKUP_RCU) {
-			if (f.flags & FDPUT_FPUT)
-				nd->base = f.file;
-			nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
 			rcu_read_lock();
+			nd->inode = nd->path.dentry->d_inode;
+			nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
 		} else {
 			path_get(&nd->path);
-			fdput(f);
+			nd->inode = nd->path.dentry->d_inode;
 		}
+		fdput(f);
+		goto done;
 	}
 
 	nd->inode = nd->path.dentry->d_inode;
@@ -1971,8 +1970,6 @@ static void path_cleanup(struct nameidata *nd)
 		path_put(&nd->root);
 		nd->root.mnt = NULL;
 	}
-	if (unlikely(nd->base))
-		fput(nd->base);
 }
 
 static int trailing_symlink(struct nameidata *nd)
-- 
2.1.4

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