diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/md/dm-thin-metadata.h')
| -rw-r--r-- | ANDROID_3.4.5/drivers/md/dm-thin-metadata.h | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-thin-metadata.h b/ANDROID_3.4.5/drivers/md/dm-thin-metadata.h deleted file mode 100644 index ed4725e6..00000000 --- a/ANDROID_3.4.5/drivers/md/dm-thin-metadata.h +++ /dev/null @@ -1,169 +0,0 @@ -/* - * Copyright (C) 2010-2011 Red Hat, Inc. - * - * This file is released under the GPL. - */ - -#ifndef DM_THIN_METADATA_H -#define DM_THIN_METADATA_H - -#include "persistent-data/dm-block-manager.h" - -#define THIN_METADATA_BLOCK_SIZE 4096 - -/* - * 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))) - -/* - * A metadata device larger than 16GB triggers a warning. - */ -#define THIN_METADATA_MAX_SECTORS_WARNING (16 * (1024 * 1024 * 1024 >> SECTOR_SHIFT)) - -/*----------------------------------------------------------------*/ - -struct dm_pool_metadata; -struct dm_thin_device; - -/* - * Device identifier - */ -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); - -int dm_pool_metadata_close(struct dm_pool_metadata *pmd); - -/* - * Compat feature flags. Any incompat flags beyond the ones - * specified below will prevent use of the thin metadata. - */ -#define THIN_FEATURE_COMPAT_SUPP 0UL -#define THIN_FEATURE_COMPAT_RO_SUPP 0UL -#define THIN_FEATURE_INCOMPAT_SUPP 0UL - -/* - * Device creation/deletion. - */ -int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev); - -/* - * An internal snapshot. - * - * You can only snapshot a quiesced origin i.e. one that is either - * suspended or not instanced at all. - */ -int dm_pool_create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev, - dm_thin_id origin); - -/* - * Deletes a virtual device from the metadata. It _is_ safe to call this - * when that device is open. Operations on that device will just start - * failing. You still need to call close() on the device. - */ -int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, - dm_thin_id dev); - -/* - * Commits _all_ metadata changes: device creation, deletion, mapping - * updates. - */ -int dm_pool_commit_metadata(struct dm_pool_metadata *pmd); - -/* - * Set/get userspace transaction id. - */ -int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, - uint64_t current_id, - uint64_t new_id); - -int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, - uint64_t *result); - -/* - * Hold/get root for userspace transaction. - */ -int dm_pool_hold_metadata_root(struct dm_pool_metadata *pmd); - -int dm_pool_get_held_metadata_root(struct dm_pool_metadata *pmd, - dm_block_t *result); - -/* - * Actions on a single virtual device. - */ - -/* - * Opening the same device more than once will fail with -EBUSY. - */ -int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, - struct dm_thin_device **td); - -int dm_pool_close_thin_device(struct dm_thin_device *td); - -dm_thin_id dm_thin_dev_id(struct dm_thin_device *td); - -struct dm_thin_lookup_result { - dm_block_t block; - int shared; -}; - -/* - * Returns: - * -EWOULDBLOCK iff @can_block is set and would block. - * -ENODATA iff that mapping is not present. - * 0 success - */ -int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, - int can_block, struct dm_thin_lookup_result *result); - -/* - * Obtain an unused block. - */ -int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result); - -/* - * Insert or remove block. - */ -int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, - dm_block_t data_block); - -int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); - -/* - * Queries. - */ -int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, - dm_block_t *highest_mapped); - -int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result); - -int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, - dm_block_t *result); - -int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, - dm_block_t *result); - -int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, - dm_block_t *result); - -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); - -/* - * 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); - -/*----------------------------------------------------------------*/ - -#endif |