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

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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>
This commit is contained in:
Namjae Jeon 2011-10-23 19:28:32 +09:00 committed by Jan Kara
parent 6360e21f94
commit 3080a74ea3
4 changed files with 43 additions and 36 deletions
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8
fs/udf/partition.c
View File

@ -321,8 +321,14 @@ uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
/* We shouldn't mount such media... */
BUG_ON(!inode);
retblk = udf_try_read_meta(inode, block, partition, offset);
if (retblk == 0xFFFFFFFF) {
if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
if (!mdata->s_mirror_loaded_flag) {
mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
mdata->s_mirror_file_loc, map->s_partition_num);
mdata->s_mirror_loaded_flag = 1;
}
inode = mdata->s_mirror_fe;
if (!inode)
return 0xFFFFFFFF;

68
fs/udf/super.c
View File

@ -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 */
udf_debug("Mirror metadata file location: block = %d part = %d\n",
mdata->s_mirror_file_loc, map->s_partition_num);
/* mirror file entry */
addr.logicalBlockNum = mdata->s_mirror_file_loc;
addr.partitionReferenceNum = map->s_partition_num;
mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
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_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;
}
}
/*

1
fs/udf/udf_sb.h
View File

@ -61,6 +61,7 @@ struct udf_meta_data {
__u32 s_alloc_unit_size;
__u16 s_align_unit_size;
__u8 s_dup_md_flag;
__u8 s_mirror_loaded_flag;
struct inode *s_metadata_fe;
struct inode *s_mirror_fe;
struct inode *s_bitmap_fe;

2
fs/udf/udfdecl.h
View File

@ -135,6 +135,8 @@ static inline void udf_updated_lvid(struct super_block *sb)
UDF_SB(sb)->s_lvid_dirty = 1;
}
extern u64 lvid_get_unique_id(struct super_block *sb);
struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
u32 meta_file_loc, u32 partition_num);
/* namei.c */
extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,