From: Joe Thornber Date: Fri, 27 Jul 2012 14:08:09 +0000 (+0100) Subject: dm persistent data: tidy transaction manager creation fns X-Git-Tag: firefly_0821_release~3680^2~2312^2~26 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=384ef0e62e409e52c80adef5b1ff83075377c19e;p=firefly-linux-kernel-4.4.55.git dm persistent data: tidy transaction manager creation fns Tidy the transaction manager creation functions. They no longer lock the superblock. Superblock locking is pulled out to the caller. Also export dm_bm_write_lock_zero. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index c8f36227fd7b..4aadeae3af67 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -418,8 +418,7 @@ static int init_pmd(struct dm_pool_metadata *pmd, struct dm_block *sblock; if (create) { - r = dm_tm_create_with_sm(bm, THIN_SUPERBLOCK_LOCATION, - &sb_validator, &tm, &sm, &sblock); + r = dm_tm_create_with_sm(bm, THIN_SUPERBLOCK_LOCATION, &tm, &sm); if (r < 0) { DMERR("tm_create_with_sm failed"); return r; @@ -428,38 +427,51 @@ static int init_pmd(struct dm_pool_metadata *pmd, data_sm = dm_sm_disk_create(tm, nr_blocks); if (IS_ERR(data_sm)) { DMERR("sm_disk_create failed"); - dm_tm_unlock(tm, sblock); r = PTR_ERR(data_sm); goto bad; } + + /* + * We cycle the superblock to let the validator do its stuff. + */ + r = dm_bm_write_lock_zero(bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, &sblock); + if (r < 0) { + DMERR("couldn't lock superblock"); + goto bad; + } + + dm_bm_unlock(sblock); + } else { - struct thin_disk_superblock *disk_super = NULL; - size_t space_map_root_offset = - offsetof(struct thin_disk_superblock, metadata_space_map_root); + struct thin_disk_superblock *disk_super; + + r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, &sblock); + if (r < 0) { + DMERR("couldn't read superblock"); + return r; + } + disk_super = dm_block_data(sblock); r = dm_tm_open_with_sm(bm, THIN_SUPERBLOCK_LOCATION, - &sb_validator, space_map_root_offset, - SPACE_MAP_ROOT_SIZE, &tm, &sm, &sblock); + disk_super->metadata_space_map_root, + sizeof(disk_super->metadata_space_map_root), + &tm, &sm); if (r < 0) { DMERR("tm_open_with_sm failed"); + dm_bm_unlock(sblock); return r; } - disk_super = dm_block_data(sblock); data_sm = dm_sm_disk_open(tm, disk_super->data_space_map_root, sizeof(disk_super->data_space_map_root)); if (IS_ERR(data_sm)) { DMERR("sm_disk_open failed"); + dm_bm_unlock(sblock); r = PTR_ERR(data_sm); goto bad; } - } - - r = dm_tm_unlock(tm, sblock); - if (r < 0) { - DMERR("couldn't unlock superblock"); - goto bad_data_sm; + dm_bm_unlock(sblock); } pmd->bm = bm; diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c index c70ad6e303d3..4b5c504f47af 100644 --- a/drivers/md/persistent-data/dm-block-manager.c +++ b/drivers/md/persistent-data/dm-block-manager.c @@ -565,6 +565,7 @@ int dm_bm_write_lock_zero(struct dm_block_manager *bm, return 0; } +EXPORT_SYMBOL_GPL(dm_bm_write_lock_zero); int dm_bm_unlock(struct dm_block *b) { diff --git a/drivers/md/persistent-data/dm-transaction-manager.c b/drivers/md/persistent-data/dm-transaction-manager.c index 86c3705052a4..b4f05830af07 100644 --- a/drivers/md/persistent-data/dm-transaction-manager.c +++ b/drivers/md/persistent-data/dm-transaction-manager.c @@ -310,12 +310,10 @@ struct dm_block_manager *dm_tm_get_bm(struct dm_transaction_manager *tm) static int dm_tm_create_internal(struct dm_block_manager *bm, dm_block_t sb_location, - struct dm_block_validator *sb_validator, - size_t root_offset, size_t root_max_len, struct dm_transaction_manager **tm, struct dm_space_map **sm, - struct dm_block **sblock, - int create) + int create, + void *sm_root, size_t sm_len) { int r; @@ -330,64 +328,43 @@ static int dm_tm_create_internal(struct dm_block_manager *bm, } if (create) { - r = dm_bm_write_lock_zero(dm_tm_get_bm(*tm), sb_location, - sb_validator, sblock); - if (r < 0) { - DMERR("couldn't lock superblock"); - goto bad1; - } - r = dm_sm_metadata_create(*sm, *tm, dm_bm_nr_blocks(bm), sb_location); if (r) { DMERR("couldn't create metadata space map"); - goto bad2; + goto bad; } } else { - r = dm_bm_write_lock(dm_tm_get_bm(*tm), sb_location, - sb_validator, sblock); - if (r < 0) { - DMERR("couldn't lock superblock"); - goto bad1; - } - - r = dm_sm_metadata_open(*sm, *tm, - dm_block_data(*sblock) + root_offset, - root_max_len); + r = dm_sm_metadata_open(*sm, *tm, sm_root, sm_len); if (r) { DMERR("couldn't open metadata space map"); - goto bad2; + goto bad; } } return 0; -bad2: - dm_tm_unlock(*tm, *sblock); -bad1: +bad: dm_tm_destroy(*tm); + dm_sm_destroy(*sm); return r; } int dm_tm_create_with_sm(struct dm_block_manager *bm, dm_block_t sb_location, - struct dm_block_validator *sb_validator, struct dm_transaction_manager **tm, - struct dm_space_map **sm, struct dm_block **sblock) + struct dm_space_map **sm) { - return dm_tm_create_internal(bm, sb_location, sb_validator, - 0, 0, tm, sm, sblock, 1); + return dm_tm_create_internal(bm, sb_location, tm, sm, 1, NULL, 0); } EXPORT_SYMBOL_GPL(dm_tm_create_with_sm); int dm_tm_open_with_sm(struct dm_block_manager *bm, dm_block_t sb_location, - struct dm_block_validator *sb_validator, - size_t root_offset, size_t root_max_len, + void *sm_root, size_t root_len, struct dm_transaction_manager **tm, - struct dm_space_map **sm, struct dm_block **sblock) + struct dm_space_map **sm) { - return dm_tm_create_internal(bm, sb_location, sb_validator, root_offset, - root_max_len, tm, sm, sblock, 0); + return dm_tm_create_internal(bm, sb_location, tm, sm, 0, sm_root, root_len); } EXPORT_SYMBOL_GPL(dm_tm_open_with_sm); diff --git a/drivers/md/persistent-data/dm-transaction-manager.h b/drivers/md/persistent-data/dm-transaction-manager.h index 6da784871db4..b5b139076ca5 100644 --- a/drivers/md/persistent-data/dm-transaction-manager.h +++ b/drivers/md/persistent-data/dm-transaction-manager.h @@ -115,16 +115,17 @@ struct dm_block_manager *dm_tm_get_bm(struct dm_transaction_manager *tm); * * Returns a tm that has an open transaction to write the new disk sm. * Caller should store the new sm root and commit. + * + * The superblock location is passed so the metadata space map knows it + * shouldn't be used. */ int dm_tm_create_with_sm(struct dm_block_manager *bm, dm_block_t sb_location, - struct dm_block_validator *sb_validator, struct dm_transaction_manager **tm, - struct dm_space_map **sm, struct dm_block **sblock); + struct dm_space_map **sm); int dm_tm_open_with_sm(struct dm_block_manager *bm, dm_block_t sb_location, - struct dm_block_validator *sb_validator, - size_t root_offset, size_t root_max_len, + void *sm_root, size_t root_len, struct dm_transaction_manager **tm, - struct dm_space_map **sm, struct dm_block **sblock); + struct dm_space_map **sm); #endif /* _LINUX_DM_TRANSACTION_MANAGER_H */