GFS2: Post-VFS scale update for RCU path walk

We can allow a few more cases to use RCU path walking than
originally allowed. It should be possible to also enable
RCU path walking when the glock is already cached. Thats
a bit more complicated though, so left for a future patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Nick Piggin <npiggin@gmail.com>

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 7118f1a..cbc0715 100644 (file)
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -80,8 +80,11 @@ int gfs2_check_acl(struct inode *inode, int mask, unsigned int flags)
        struct posix_acl *acl;
        int error;
 
-       if (flags & IPERM_FLAG_RCU)
-               return -ECHILD;
+       if (flags & IPERM_FLAG_RCU) {
+               if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))
+                       return -ECHILD;
+               return -EAGAIN;
+       }
 
        acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);
        if (IS_ERR(acl))

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index d8b26ac..09e436a 100644 (file)
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -1026,9 +1026,9 @@ static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
 
 /**
  * gfs2_permission -
- * @inode:
- * @mask:
- * @nd: passed from Linux VFS, ignored by us
+ * @inode: The inode
+ * @mask: The mask to be tested
+ * @flags: Indicates whether this is an RCU path walk or not
  *
  * This may be called from the VFS directly, or from within GFS2 with the
  * inode locked, so we look to see if the glock is already locked and only
@@ -1044,11 +1044,11 @@ int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
        int error;
        int unlock = 0;
 
-       if (flags & IPERM_FLAG_RCU)
-               return -ECHILD;
 
        ip = GFS2_I(inode);
        if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
+               if (flags & IPERM_FLAG_RCU)
+                       return -ECHILD;
                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
                if (error)
                        return error;