Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...

[firefly-linux-kernel-4.4.55.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index e0a33f598cdf18e651d29d82939f6243bef38036..dc984fee553239babe77672918be83f80aa325a6 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -600,14 +600,10 @@ static int complete_walk(struct nameidata *nd)
        if (likely(!(nd->flags & LOOKUP_JUMPED)))
                return 0;
 
-       if (likely(!(dentry->d_flags & DCACHE_OP_REVALIDATE)))
+       if (likely(!(dentry->d_flags & DCACHE_OP_WEAK_REVALIDATE)))
                return 0;
 
-       if (likely(!(dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)))
-               return 0;
-
-       /* Note: we do not d_invalidate() */
-       status = d_revalidate(dentry, nd->flags);
+       status = dentry->d_op->d_weak_revalidate(dentry, nd->flags);
        if (status > 0)
                return 0;
 
@@ -1342,7 +1338,7 @@ static struct dentry *__lookup_hash(struct qstr *name,
  *  small and for now I'd prefer to have fast path as straight as possible.
  *  It _is_ time-critical.
  */
-static int lookup_fast(struct nameidata *nd, struct qstr *name,
+static int lookup_fast(struct nameidata *nd,
                       struct path *path, struct inode **inode)
 {
        struct vfsmount *mnt = nd->path.mnt;
@@ -1358,7 +1354,7 @@ static int lookup_fast(struct nameidata *nd, struct qstr *name,
         */
        if (nd->flags & LOOKUP_RCU) {
                unsigned seq;
-               dentry = __d_lookup_rcu(parent, name, &seq, nd->inode);
+               dentry = __d_lookup_rcu(parent, &nd->last, &seq, nd->inode);
                if (!dentry)
                        goto unlazy;
 
@@ -1400,7 +1396,7 @@ unlazy:
                if (unlazy_walk(nd, dentry))
                        return -ECHILD;
        } else {
-               dentry = __d_lookup(parent, name);
+               dentry = __d_lookup(parent, &nd->last);
        }
 
        if (unlikely(!dentry))
@@ -1436,8 +1432,7 @@ need_lookup:
 }
 
 /* Fast lookup failed, do it the slow way */
-static int lookup_slow(struct nameidata *nd, struct qstr *name,
-                      struct path *path)
+static int lookup_slow(struct nameidata *nd, struct path *path)
 {
        struct dentry *dentry, *parent;
        int err;
@@ -1446,7 +1441,7 @@ static int lookup_slow(struct nameidata *nd, struct qstr *name,
        BUG_ON(nd->inode != parent->d_inode);
 
        mutex_lock(&parent->d_inode->i_mutex);
-       dentry = __lookup_hash(name, parent, nd->flags);
+       dentry = __lookup_hash(&nd->last, parent, nd->flags);
        mutex_unlock(&parent->d_inode->i_mutex);
        if (IS_ERR(dentry))
                return PTR_ERR(dentry);
@@ -1519,7 +1514,7 @@ static inline int should_follow_link(struct inode *inode, int follow)
 }
 
 static inline int walk_component(struct nameidata *nd, struct path *path,
-               struct qstr *name, int type, int follow)
+               int follow)
 {
        struct inode *inode;
        int err;
@@ -1528,14 +1523,14 @@ static inline int walk_component(struct nameidata *nd, struct path *path,
         * to be able to know about the current root directory and
         * parent relationships.
         */
-       if (unlikely(type != LAST_NORM))
-               return handle_dots(nd, type);
-       err = lookup_fast(nd, name, path, &inode);
+       if (unlikely(nd->last_type != LAST_NORM))
+               return handle_dots(nd, nd->last_type);
+       err = lookup_fast(nd, path, &inode);
        if (unlikely(err)) {
                if (err < 0)
                        goto out_err;
 
-               err = lookup_slow(nd, name, path);
+               err = lookup_slow(nd, path);
                if (err < 0)
                        goto out_err;
 
@@ -1594,8 +1589,7 @@ static inline int nested_symlink(struct path *path, struct nameidata *nd)
                res = follow_link(&link, nd, &cookie);
                if (res)
                        break;
-               res = walk_component(nd, path, &nd->last,
-                                    nd->last_type, LOOKUP_FOLLOW);
+               res = walk_component(nd, path, LOOKUP_FOLLOW);
                put_link(nd, &link, cookie);
        } while (res > 0);
 
@@ -1802,8 +1796,11 @@ static int link_path_walk(const char *name, struct nameidata *nd)
                        }
                }
 
+               nd->last = this;
+               nd->last_type = type;
+
                if (!name[len])
-                       goto last_component;
+                       return 0;
                /*
                 * If it wasn't NUL, we know it was '/'. Skip that
                 * slash, and continue until no more slashes.
@@ -1812,10 +1809,11 @@ static int link_path_walk(const char *name, struct nameidata *nd)
                        len++;
                } while (unlikely(name[len] == '/'));
                if (!name[len])
-                       goto last_component;
+                       return 0;
+
                name += len;
 
-               err = walk_component(nd, &next, &this, type, LOOKUP_FOLLOW);
+               err = walk_component(nd, &next, LOOKUP_FOLLOW);
                if (err < 0)
                        return err;
 
@@ -1824,16 +1822,10 @@ static int link_path_walk(const char *name, struct nameidata *nd)
                        if (err)
                                return err;
                }
-               if (can_lookup(nd->inode))
-                       continue;
-               err = -ENOTDIR; 
-               break;
-               /* here ends the main loop */
-
-last_component:
-               nd->last = this;
-               nd->last_type = type;
-               return 0;
+               if (!can_lookup(nd->inode)) {
+                       err = -ENOTDIR; 
+                       break;
+               }
        }
        terminate_walk(nd);
        return err;
@@ -1932,8 +1924,7 @@ static inline int lookup_last(struct nameidata *nd, struct path *path)
                nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
 
        nd->flags &= ~LOOKUP_PARENT;
-       return walk_component(nd, path, &nd->last, nd->last_type,
-                                       nd->flags & LOOKUP_FOLLOW);
+       return walk_component(nd, path, nd->flags & LOOKUP_FOLLOW);
 }
 
 /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
@@ -2732,7 +2723,7 @@ static int do_last(struct nameidata *nd, struct path *path,
                if (open_flag & O_PATH && !(nd->flags & LOOKUP_FOLLOW))
                        symlink_ok = true;
                /* we _can_ be in RCU mode here */
-               error = lookup_fast(nd, &nd->last, path, &inode);
+               error = lookup_fast(nd, path, &inode);
                if (likely(!error))
                        goto finish_lookup;