udf: Skip mirror metadata FE loading when metadata FE is ok

It is not necessary to load mirror metadata FE when metadata FE is OK.  So try
to read it only the first time udf_get_pblock_meta25() fails to map the block
from metadata FE.

Signed-off-by: Ashish Sangwan <ashishsangwan2@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 33 insertions, 35 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index e58123ad..dfe043a 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -826,59 +826,57 @@ out1:
 	return ret;
 }
 
+struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
+					u32 meta_file_loc, u32 partition_num)
+{
+	struct kernel_lb_addr addr;
+	struct inode *metadata_fe;
+
+	addr.logicalBlockNum = meta_file_loc;
+	addr.partitionReferenceNum = partition_num;
+
+	metadata_fe = udf_iget(sb, &addr);
+
+	if (metadata_fe == NULL)
+		udf_warn(sb, "metadata inode efe not found\n");
+	else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
+		udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
+		iput(metadata_fe);
+		metadata_fe = NULL;
+	}
+
+	return metadata_fe;
+}
+
 static int udf_load_metadata_files(struct super_block *sb, int partition)
 {
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct udf_part_map *map;
 	struct udf_meta_data *mdata;
 	struct kernel_lb_addr addr;
-	int fe_error = 0;
 
 	map = &sbi->s_partmaps[partition];
 	mdata = &map->s_type_specific.s_metadata;
 
 	/* metadata address */
-	addr.logicalBlockNum =  mdata->s_meta_file_loc;
-	addr.partitionReferenceNum = map->s_partition_num;
-
 	udf_debug("Metadata file location: block = %d part = %d\n",
-		  addr.logicalBlockNum, addr.partitionReferenceNum);
+		  mdata->s_meta_file_loc, map->s_partition_num);
 
-	mdata->s_metadata_fe = udf_iget(sb, &addr);
+	mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
+		mdata->s_meta_file_loc, map->s_partition_num);
 
 	if (mdata->s_metadata_fe == NULL) {
-		udf_warn(sb, "metadata inode efe not found, will try mirror inode\n");
-		fe_error = 1;
-	} else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
-		 ICBTAG_FLAG_AD_SHORT) {
-		udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
-		fe_error = 1;
-		iput(mdata->s_metadata_fe);
-		mdata->s_metadata_fe = NULL;
-	}
-
-	/* mirror file entry */
-	addr.logicalBlockNum = mdata->s_mirror_file_loc;
-	addr.partitionReferenceNum = map->s_partition_num;
+		/* mirror file entry */
+		udf_debug("Mirror metadata file location: block = %d part = %d\n",
+			  mdata->s_mirror_file_loc, map->s_partition_num);
 
-	udf_debug("Mirror metadata file location: block = %d part = %d\n",
-		  addr.logicalBlockNum, addr.partitionReferenceNum);
+		mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
+			mdata->s_mirror_file_loc, map->s_partition_num);
 
-	mdata->s_mirror_fe = udf_iget(sb, &addr);
-
-	if (mdata->s_mirror_fe == NULL) {
-		if (fe_error) {
-			udf_err(sb, "mirror inode efe not found and metadata inode is missing too, exiting...\n");
-			goto error_exit;
-		} else
-			udf_warn(sb, "mirror inode efe not found, but metadata inode is OK\n");
-	} else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
-		 ICBTAG_FLAG_AD_SHORT) {
-		udf_warn(sb, "mirror inode efe does not have short allocation descriptors!\n");
-		iput(mdata->s_mirror_fe);
-		mdata->s_mirror_fe = NULL;
-		if (fe_error)
+		if (mdata->s_mirror_fe == NULL) {
+			udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
 			goto error_exit;
+		}
 	}
 
 	/*