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Clean follow_dotdot() up a bit

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No need to open-code follow_up() in it and locking can be lighter.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-01-30 15:47:29 -05:00
parent de27a5bf9c
commit 3088dd7080
1 changed files with 3 additions and 16 deletions
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19
fs/namei.c
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@ -689,33 +689,20 @@ static __always_inline void follow_dotdot(struct nameidata *nd)
set_root(nd);
while(1) {
struct vfsmount *parent;
struct dentry *old = nd->path.dentry;
if (nd->path.dentry == nd->root.dentry &&
nd->path.mnt == nd->root.mnt) {
break;
}
spin_lock(&dcache_lock);
if (nd->path.dentry != nd->path.mnt->mnt_root) {
nd->path.dentry = dget(nd->path.dentry->d_parent);
spin_unlock(&dcache_lock);
/* rare case of legitimate dget_parent()... */
nd->path.dentry = dget_parent(nd->path.dentry);
dput(old);
break;
}
spin_unlock(&dcache_lock);
spin_lock(&vfsmount_lock);
parent = nd->path.mnt->mnt_parent;
if (parent == nd->path.mnt) {
spin_unlock(&vfsmount_lock);
if (!follow_up(&nd->path))
break;
}
mntget(parent);
nd->path.dentry = dget(nd->path.mnt->mnt_mountpoint);
spin_unlock(&vfsmount_lock);
dput(old);
mntput(nd->path.mnt);
nd->path.mnt = parent;
}
follow_mount(&nd->path);
}