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Message-ID: <87bnxv5y8n.fsf_-_@xmission.com>
Date: Tue, 25 Feb 2014 01:37:44 -0800
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Al Viro <viro@...iv.linux.org.uk>
Cc: "Serge E. Hallyn" <serge@...lyn.com>,
Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...capital.net>,
Rob Landley <rob@...dley.net>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Miklos Szeredi <miklos@...redi.hu>,
Christoph Hellwig <hch@...radead.org>,
Karel Zak <kzak@...hat.com>,
"J. Bruce Fields" <bfields@...ldses.org>,
Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH 05/12] vfs: factor out lookup_mountpoint from new_mountpoint
I am shortly going to add a new user of struct mountpoint that
needs to look up existing entries but does not want to create
a struct mountpoint if one does not exist. Therefore to keep
the code simple and easy to read split out lookup_mountpoint
from new_mountpoint.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
fs/namespace.c | 15 ++++++++++++---
1 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 32d380eabdac..f2f03082fe70 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -667,11 +667,10 @@ out:
return is_covered;
}
-static struct mountpoint *new_mountpoint(struct dentry *dentry)
+static struct mountpoint *lookup_mountpoint(struct dentry *dentry)
{
struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
struct mountpoint *mp;
- int ret;
list_for_each_entry(mp, chain, m_hash) {
if (mp->m_dentry == dentry) {
@@ -682,6 +681,14 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
return mp;
}
}
+ return NULL;
+}
+
+static struct mountpoint *new_mountpoint(struct dentry *dentry)
+{
+ struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
+ struct mountpoint *mp;
+ int ret;
mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);
if (!mp)
@@ -1702,7 +1709,9 @@ retry:
namespace_lock();
mnt = lookup_mnt(path);
if (likely(!mnt)) {
- struct mountpoint *mp = new_mountpoint(dentry);
+ struct mountpoint *mp = lookup_mountpoint(dentry);
+ if (!mp)
+ mp = new_mountpoint(dentry);
if (IS_ERR(mp)) {
namespace_unlock();
mutex_unlock(&dentry->d_inode->i_mutex);
--
1.7.5.4
--
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