namei: store inode in nd->stack[]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index e3214506016d48e96187601388d8c2f5d799dd0f..366b0f348d1cd654e1abaa0e90b7285e8867d90c 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -507,6 +507,7 @@ struct nameidata {
                struct path link;
                void *cookie;
                const char *name;
+               struct inode *inode;
        } *stack, internal[EMBEDDED_LEVELS];
 };
 
@@ -746,7 +747,7 @@ void nd_jump_link(struct path *path)
 static inline void put_link(struct nameidata *nd)
 {
        struct saved *last = nd->stack + --nd->depth;
-       struct inode *inode = last->link.dentry->d_inode;
+       struct inode *inode = last->inode;
        if (last->cookie && inode->i_op->put_link)
                inode->i_op->put_link(last->link.dentry, last->cookie);
        path_put(&last->link);
@@ -779,7 +780,7 @@ static inline int may_follow_link(struct nameidata *nd)
                return 0;
 
        /* Allowed if owner and follower match. */
-       inode = nd->stack[0].link.dentry->d_inode;
+       inode = nd->stack[0].inode;
        if (uid_eq(current_cred()->fsuid, inode->i_uid))
                return 0;
 
@@ -870,7 +871,7 @@ const char *get_link(struct nameidata *nd)
 {
        struct saved *last = nd->stack + nd->depth - 1;
        struct dentry *dentry = last->link.dentry;
-       struct inode *inode = dentry->d_inode;
+       struct inode *inode = last->inode;
        int error;
        const char *res;
 
@@ -1569,6 +1570,7 @@ static int pick_link(struct nameidata *nd, struct path *link, unsigned seq)
        last = nd->stack + nd->depth++;
        last->link = *link;
        last->cookie = NULL;
+       last->inode = d_backing_inode(link->dentry);
        return 1;
 }