提交 e2dfa935 编写于 作者: E Eric W. Biederman 提交者: Al Viro

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: N"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 0a5eb7c8
......@@ -703,11 +703,10 @@ bool __is_local_mountpoint(struct dentry *dentry)
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 @@ static struct mountpoint *lock_mount(struct path *path)
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);
......
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