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authorEric W. Biederman <ebiederm@xmission.com>2014-02-25 05:32:34 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-10-09 10:38:55 +0400
commite2dfa935464272395b4f35f4cc74ffcc87418b84 (patch)
tree3afcc10a2298e16883ceabf175d1c1eefa923e38 /fs/namespace.c
parent0a5eb7c8189922e86a840972cd0b57e41de6f031 (diff)
downloadlinux-e2dfa935464272395b4f35f4cc74ffcc87418b84.tar.xz
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@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 99572dd08336..88fc3f4d77ed 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -703,11 +703,10 @@ out:
return is_covered;
}
-static struct mountpoint *new_mountpoint(struct dentry *dentry)
+static struct mountpoint *lookup_mountpoint(struct dentry *dentry)
{
struct hlist_head *chain = mp_hash(dentry);
struct mountpoint *mp;
- int ret;
hlist_for_each_entry(mp, chain, m_hash) {
if (mp->m_dentry == dentry) {
@@ -718,6 +717,14 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
return mp;
}
}
+ return NULL;
+}
+
+static struct mountpoint *new_mountpoint(struct dentry *dentry)
+{
+ struct hlist_head *chain = mp_hash(dentry);
+ struct mountpoint *mp;
+ int ret;
mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);
if (!mp)
@@ -1818,7 +1825,9 @@ 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);