JFS: set GFP_NOFS to avoid recursing back into file system code

fs/jfs/jfs_mount.c

@@ -288,6 +288,11 @@ int jfs_mount_rw(struct super_block *sb, int remount)
 	 */
 	logMOUNT(sb);
 
+	/*
+	 * Set page cache allocation policy
+	 */
+	mapping_set_gfp_mask(sb->s_bdev->bd_inode->i_mapping, GFP_NOFS);
+
 	return rc;
 }
 

fs/jfs/jfs_umount.c

@@ -121,7 +121,10 @@ int jfs_umount(struct super_block *sb)
 	 * list (to signify skip logredo()).
 	 */
 	if (log) {		/* log = NULL if read-only mount */
-		rc = updateSuper(sb, FM_CLEAN);
+		updateSuper(sb, FM_CLEAN);
+
+		/* Restore default gfp_mask for bdev */
+		mapping_set_gfp_mask(bdev_mapping, GFP_USER);
 
 		/*
 		 * close log: 
@@ -168,5 +171,8 @@ int jfs_umount_rw(struct super_block *sb)
 
 	updateSuper(sb, FM_CLEAN);
 
+	/* Restore default gfp_mask for bdev */
+	mapping_set_gfp_mask(bdev_mapping, GFP_USER);
+
 	return lmLogClose(sb);
 }