X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=fs%2Fgfs2%2Finode.c;h=4e63fbb63151c495e37043fd373f50f2057d01f6;hb=refs%2Fheads%2Faccepted%2Ftizen_unified_toolchain;hp=a21ac41d66698e997b3465bd2ddf67a8967a380a;hpb=3c31041e37324e143bee98604bb31481e905b4b3;p=platform%2Fkernel%2Flinux-rpi.git

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index a21ac41..4e63fbb 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -276,10 +276,16 @@ struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 	 * gfs2_lookup_simple callers expect ENOENT
 	 * and do not check for NULL.
 	 */
-	if (inode == NULL)
-		return ERR_PTR(-ENOENT);
-	else
-		return inode;
+	if (IS_ERR_OR_NULL(inode))
+		return inode ? inode : ERR_PTR(-ENOENT);
+
+	/*
+	 * Must not call back into the filesystem when allocating
+	 * pages in the metadata inode's address space.
+	 */
+	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+
+	return inode;
 }
 
 
@@ -1860,16 +1866,24 @@ out:
 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
 		    int mask)
 {
+	int may_not_block = mask & MAY_NOT_BLOCK;
 	struct gfs2_inode *ip;
 	struct gfs2_holder i_gh;
+	struct gfs2_glock *gl;
 	int error;
 
 	gfs2_holder_mark_uninitialized(&i_gh);
 	ip = GFS2_I(inode);
-	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
-		if (mask & MAY_NOT_BLOCK)
+	gl = rcu_dereference_check(ip->i_gl, !may_not_block);
+	if (unlikely(!gl)) {
+		/* inode is getting torn down, must be RCU mode */
+		WARN_ON_ONCE(!may_not_block);
+		return -ECHILD;
+        }
+	if (gfs2_glock_is_locked_by_me(gl) == NULL) {
+		if (may_not_block)
 			return -ECHILD;
-		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
+		error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 		if (error)
 			return error;
 	}