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dm thin metadata: factor out __write_initial_superblock 

Factor out __write_initial_superblock and also pull some other initial
creation code out of dm_pool_metadata_open.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber 2012-07-27 15:08:10 +01:00 committed by Alasdair G Kergon
parent 6a0ebd31b6
commit 9cb6653f9a
1 changed files with 58 additions and 51 deletions
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109
drivers/md/dm-thin-metadata.c
View File

@ -422,6 +422,41 @@ static void __setup_btree_details(struct dm_pool_metadata *pmd)
pmd->details_info.value_type.equal = NULL;
}
static int __write_initial_superblock(struct dm_pool_metadata *pmd)
{
int r;
struct dm_block *sblock;
struct thin_disk_superblock *disk_super;
sector_t bdev_size = i_size_read(pmd->bdev->bd_inode) >> SECTOR_SHIFT;
if (bdev_size > THIN_METADATA_MAX_SECTORS)
bdev_size = THIN_METADATA_MAX_SECTORS;
r = superblock_lock_zero(pmd, &sblock);
if (r)
return r;
disk_super = dm_block_data(sblock);
disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
disk_super->version = cpu_to_le32(THIN_VERSION);
disk_super->time = 0;
disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT);
disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);
disk_super->data_block_size = cpu_to_le32(pmd->data_block_size);
r = dm_bm_unlock(sblock);
if (r)
return r;
pmd->flags = 0;
r = dm_pool_commit_metadata(pmd);
if (r < 0)
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
__func__, r);
return r;
}
static int __open_or_format_metadata(struct dm_pool_metadata *pmd,
struct dm_block_manager *bm,
dm_block_t nr_blocks, int create)
@ -495,6 +530,23 @@ static int __open_or_format_metadata(struct dm_pool_metadata *pmd,
pmd->trans_id = 0;
pmd->flags = 0;
if (!create)
return 0;
r = dm_btree_empty(&pmd->info, &pmd->root);
if (r < 0)
goto bad_data_sm;
r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
if (r < 0) {
DMERR("couldn't create devices root");
goto bad_data_sm;
}
r = __write_initial_superblock(pmd);
if (r)
goto bad_data_sm;
return 0;
bad_data_sm:
@ -695,11 +747,8 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
sector_t data_block_size)
{
int r;
struct thin_disk_superblock *disk_super;
struct dm_pool_metadata *pmd;
sector_t bdev_size = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
int create;
struct dm_block *sblock;
pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);
if (!pmd) {
@ -711,6 +760,7 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
pmd->time = 0;
INIT_LIST_HEAD(&pmd->thin_devices);
pmd->bdev = bdev;
pmd->data_block_size = data_block_size;
r = __create_persistent_data_objects(pmd, 0, &create);
if (r) {
@ -720,57 +770,14 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
if (!create) {
r = __begin_transaction(pmd);
if (r < 0)
goto bad;
return pmd;
}
/*
* Create.
*/
r = superblock_lock_zero(pmd, &sblock);
if (r)
goto bad;
if (bdev_size > THIN_METADATA_MAX_SECTORS)
bdev_size = THIN_METADATA_MAX_SECTORS;
disk_super = dm_block_data(sblock);
disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
disk_super->version = cpu_to_le32(THIN_VERSION);
disk_super->time = 0;
disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE >> SECTOR_SHIFT);
disk_super->metadata_nr_blocks = cpu_to_le64(bdev_size >> SECTOR_TO_BLOCK_SHIFT);
disk_super->data_block_size = cpu_to_le32(data_block_size);
r = dm_bm_unlock(sblock);
if (r < 0)
goto bad;
r = dm_btree_empty(&pmd->info, &pmd->root);
if (r < 0)
goto bad;
r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
if (r < 0) {
DMERR("couldn't create devices root");
goto bad;
}
pmd->flags = 0;
r = dm_pool_commit_metadata(pmd);
if (r < 0) {
DMERR("%s: dm_pool_commit_metadata() failed, error = %d",
__func__, r);
goto bad;
if (r < 0) {
if (dm_pool_metadata_close(pmd) < 0)
DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
return ERR_PTR(r);
}
}
return pmd;
bad:
if (dm_pool_metadata_close(pmd) < 0)
DMWARN("%s: dm_pool_metadata_close() failed.", __func__);
return ERR_PTR(r);
}
int dm_pool_metadata_close(struct dm_pool_metadata *pmd)