diff options
Diffstat (limited to 'drivers/md/dm-thin-metadata.h')
| -rw-r--r-- | drivers/md/dm-thin-metadata.h | 56 |
1 files changed, 49 insertions, 7 deletions
diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index b88918ccdaf..e3c857db195 100644 --- a/drivers/md/dm-thin-metadata.h +++ b/drivers/md/dm-thin-metadata.h @@ -8,16 +8,15 @@ #define DM_THIN_METADATA_H #include "persistent-data/dm-block-manager.h" +#include "persistent-data/dm-space-map.h" +#include "persistent-data/dm-space-map-metadata.h" -#define THIN_METADATA_BLOCK_SIZE 4096 +#define THIN_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE /* * The metadata device is currently limited in size. - * - * We have one block of index, which can hold 255 index entries. Each - * index entry contains allocation info about 16k metadata blocks. */ -#define THIN_METADATA_MAX_SECTORS (255 * (1 << 14) * (THIN_METADATA_BLOCK_SIZE / (1 << SECTOR_SHIFT))) +#define THIN_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS /* * A metadata device larger than 16GB triggers a warning. @@ -26,6 +25,11 @@ /*----------------------------------------------------------------*/ +/* + * Thin metadata superblock flags. + */ +#define THIN_METADATA_NEEDS_CHECK_FLAG (1 << 0) + struct dm_pool_metadata; struct dm_thin_device; @@ -38,7 +42,8 @@ typedef uint64_t dm_thin_id; * Reopens or creates a new, empty metadata volume. */ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, - sector_t data_block_size); + sector_t data_block_size, + bool format_device); int dm_pool_metadata_close(struct dm_pool_metadata *pmd); @@ -79,6 +84,16 @@ int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, int dm_pool_commit_metadata(struct dm_pool_metadata *pmd); /* + * Discards all uncommitted changes. Rereads the superblock, rolling back + * to the last good transaction. Thin devices remain open. + * dm_thin_aborted_changes() tells you if they had uncommitted changes. + * + * If this call fails it's only useful to call dm_pool_metadata_close(). + * All other methods will fail with -EINVAL. + */ +int dm_pool_abort_metadata(struct dm_pool_metadata *pmd); + +/* * Set/get userspace transaction id. */ int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, @@ -119,7 +134,7 @@ dm_thin_id dm_thin_dev_id(struct dm_thin_device *td); struct dm_thin_lookup_result { dm_block_t block; - int shared; + bool shared:1; }; /* @@ -147,6 +162,12 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); /* * Queries. */ +bool dm_thin_changed_this_transaction(struct dm_thin_device *td); + +bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd); + +bool dm_thin_aborted_changes(struct dm_thin_device *td); + int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, dm_block_t *highest_mapped); @@ -165,11 +186,32 @@ int dm_pool_get_data_block_size(struct dm_pool_metadata *pmd, sector_t *result); int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result); +int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result); + /* * Returns -ENOSPC if the new size is too small and already allocated * blocks would be lost. */ int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_size); +int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_size); + +/* + * Flicks the underlying block manager into read only mode, so you know + * that nothing is changing. + */ +void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd); +void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd); + +int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, + dm_block_t threshold, + dm_sm_threshold_fn fn, + void *context); + +/* + * Updates the superblock immediately. + */ +int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd); +bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd); /*----------------------------------------------------------------*/ |