[PATCH] namei fixes (2/19)

All callers of do_follow_link() do mntget() right before it and
dput()+mntput() right after.  These calls are moved inside do_follow_link()
now.

Obviously equivalent transformation.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/namei.c b/fs/namei.c
index abeec34..12d75ed 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -526,6 +526,7 @@ static inline int __do_follow_link(struct dentry *dentry, struct nameidata *nd)
 static inline int do_follow_link(struct path *path, struct nameidata *nd)
 {
        int err = -ELOOP;
+       mntget(path->mnt);
        if (current->link_count >= MAX_NESTED_LINKS)
                goto loop;
        if (current->total_link_count >= 40)
@@ -541,9 +542,13 @@ static inline int do_follow_link(struct path *path, struct nameidata *nd)
        err = __do_follow_link(path->dentry, nd);
        current->link_count--;
        nd->depth--;
+       dput(path->dentry);
+       mntput(path->mnt);
        return err;
 loop:
        path_release(nd);
+       dput(path->dentry);
+       mntput(path->mnt);
        return err;
 }
 
@@ -783,10 +788,7 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
                        goto out_dput;
 
                if (inode->i_op->follow_link) {
-                       mntget(next.mnt);
                        err = do_follow_link(&next, nd);
-                       dput(next.dentry);
-                       mntput(next.mnt);
                        if (err)
                                goto return_err;
                        err = -ENOENT;
@@ -837,10 +839,7 @@ last_component:
                inode = next.dentry->d_inode;
                if ((lookup_flags & LOOKUP_FOLLOW)
                    && inode && inode->i_op && inode->i_op->follow_link) {
-                       mntget(next.mnt);
                        err = do_follow_link(&next, nd);
-                       dput(next.dentry);
-                       mntput(next.mnt);
                        if (err)
                                goto return_err;
                        inode = nd->dentry->d_inode;