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drivers/md/dm-thin-metadata.c
45.5 KB
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/* |
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* Copyright (C) 2011-2012 Red Hat, Inc. |
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* * This file is released under the GPL. */ #include "dm-thin-metadata.h" #include "persistent-data/dm-btree.h" #include "persistent-data/dm-space-map.h" #include "persistent-data/dm-space-map-disk.h" #include "persistent-data/dm-transaction-manager.h" #include <linux/list.h> #include <linux/device-mapper.h> #include <linux/workqueue.h> /*-------------------------------------------------------------------------- * As far as the metadata goes, there is: * * - A superblock in block zero, taking up fewer than 512 bytes for * atomic writes. * * - A space map managing the metadata blocks. * * - A space map managing the data blocks. * * - A btree mapping our internal thin dev ids onto struct disk_device_details. * * - A hierarchical btree, with 2 levels which effectively maps (thin * dev id, virtual block) -> block_time. Block time is a 64-bit * field holding the time in the low 24 bits, and block in the top 48 * bits. * * BTrees consist solely of btree_nodes, that fill a block. Some are * internal nodes, as such their values are a __le64 pointing to other * nodes. Leaf nodes can store data of any reasonable size (ie. much * smaller than the block size). The nodes consist of the header, * followed by an array of keys, followed by an array of values. We have * to binary search on the keys so they're all held together to help the * cpu cache. * * Space maps have 2 btrees: * * - One maps a uint64_t onto a struct index_entry. Which points to a * bitmap block, and has some details about how many free entries there * are etc. * * - The bitmap blocks have a header (for the checksum). Then the rest * of the block is pairs of bits. With the meaning being: * * 0 - ref count is 0 * 1 - ref count is 1 * 2 - ref count is 2 * 3 - ref count is higher than 2 * * - If the count is higher than 2 then the ref count is entered in a * second btree that directly maps the block_address to a uint32_t ref * count. * * The space map metadata variant doesn't have a bitmaps btree. Instead * it has one single blocks worth of index_entries. This avoids * recursive issues with the bitmap btree needing to allocate space in * order to insert. With a small data block size such as 64k the * metadata support data devices that are hundreds of terrabytes. * * The space maps allocate space linearly from front to back. Space that * is freed in a transaction is never recycled within that transaction. * To try and avoid fragmenting _free_ space the allocator always goes * back and fills in gaps. * * All metadata io is in THIN_METADATA_BLOCK_SIZE sized/aligned chunks * from the block manager. *--------------------------------------------------------------------------*/ #define DM_MSG_PREFIX "thin metadata" #define THIN_SUPERBLOCK_MAGIC 27022010 #define THIN_SUPERBLOCK_LOCATION 0 |
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#define THIN_VERSION 2 |
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#define SECTOR_TO_BLOCK_SHIFT 3 |
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/* |
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* For btree insert: |
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* 3 for btree insert + * 2 for btree lookup used within space map |
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* For btree remove: * 2 for shadow spine + * 4 for rebalance 3 child node |
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*/ |
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#define THIN_MAX_CONCURRENT_LOCKS 6 |
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|
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/* This should be plenty */ #define SPACE_MAP_ROOT_SIZE 128 /* * Little endian on-disk superblock and device details. */ struct thin_disk_superblock { __le32 csum; /* Checksum of superblock except for this field. */ __le32 flags; __le64 blocknr; /* This block number, dm_block_t. */ __u8 uuid[16]; __le64 magic; __le32 version; __le32 time; __le64 trans_id; /* * Root held by userspace transactions. */ __le64 held_root; __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; /* * 2-level btree mapping (dev_id, (dev block, time)) -> data block */ __le64 data_mapping_root; /* * Device detail root mapping dev_id -> device_details */ __le64 device_details_root; __le32 data_block_size; /* In 512-byte sectors. */ __le32 metadata_block_size; /* In 512-byte sectors. */ __le64 metadata_nr_blocks; __le32 compat_flags; __le32 compat_ro_flags; __le32 incompat_flags; } __packed; struct disk_device_details { __le64 mapped_blocks; __le64 transaction_id; /* When created. */ __le32 creation_time; __le32 snapshotted_time; } __packed; struct dm_pool_metadata { struct hlist_node hash; struct block_device *bdev; struct dm_block_manager *bm; struct dm_space_map *metadata_sm; struct dm_space_map *data_sm; struct dm_transaction_manager *tm; struct dm_transaction_manager *nb_tm; /* * Two-level btree. * First level holds thin_dev_t. * Second level holds mappings. */ struct dm_btree_info info; /* * Non-blocking version of the above. */ struct dm_btree_info nb_info; /* * Just the top level for deleting whole devices. */ struct dm_btree_info tl_info; /* * Just the bottom level for creating new devices. */ struct dm_btree_info bl_info; /* * Describes the device details btree. */ struct dm_btree_info details_info; struct rw_semaphore root_lock; uint32_t time; |
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dm_block_t root; dm_block_t details_root; struct list_head thin_devices; uint64_t trans_id; unsigned long flags; sector_t data_block_size; |
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/* |
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* We reserve a section of the metadata for commit overhead. * All reported space does *not* include this. */ dm_block_t metadata_reserve; /* |
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* Set if a transaction has to be aborted but the attempt to roll back * to the previous (good) transaction failed. The only pool metadata * operation possible in this state is the closing of the device. */ bool fail_io:1; |
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/* * Reading the space map roots can fail, so we read it into these * buffers before the superblock is locked and updated. */ __u8 data_space_map_root[SPACE_MAP_ROOT_SIZE]; __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; |
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}; struct dm_thin_device { struct list_head list; struct dm_pool_metadata *pmd; dm_thin_id id; int open_count; |
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bool changed:1; bool aborted_with_changes:1; |
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uint64_t mapped_blocks; uint64_t transaction_id; uint32_t creation_time; uint32_t snapshotted_time; }; /*---------------------------------------------------------------- * superblock validator *--------------------------------------------------------------*/ #define SUPERBLOCK_CSUM_XOR 160774 static void sb_prepare_for_write(struct dm_block_validator *v, struct dm_block *b, size_t block_size) { struct thin_disk_superblock *disk_super = dm_block_data(b); disk_super->blocknr = cpu_to_le64(dm_block_location(b)); disk_super->csum = cpu_to_le32(dm_bm_checksum(&disk_super->flags, block_size - sizeof(__le32), SUPERBLOCK_CSUM_XOR)); } static int sb_check(struct dm_block_validator *v, struct dm_block *b, size_t block_size) { struct thin_disk_superblock *disk_super = dm_block_data(b); __le32 csum_le; if (dm_block_location(b) != le64_to_cpu(disk_super->blocknr)) { DMERR("sb_check failed: blocknr %llu: " "wanted %llu", le64_to_cpu(disk_super->blocknr), (unsigned long long)dm_block_location(b)); return -ENOTBLK; } if (le64_to_cpu(disk_super->magic) != THIN_SUPERBLOCK_MAGIC) { DMERR("sb_check failed: magic %llu: " "wanted %llu", le64_to_cpu(disk_super->magic), (unsigned long long)THIN_SUPERBLOCK_MAGIC); return -EILSEQ; } csum_le = cpu_to_le32(dm_bm_checksum(&disk_super->flags, block_size - sizeof(__le32), SUPERBLOCK_CSUM_XOR)); if (csum_le != disk_super->csum) { DMERR("sb_check failed: csum %u: wanted %u", le32_to_cpu(csum_le), le32_to_cpu(disk_super->csum)); return -EILSEQ; } return 0; } static struct dm_block_validator sb_validator = { .name = "superblock", .prepare_for_write = sb_prepare_for_write, .check = sb_check }; /*---------------------------------------------------------------- * Methods for the btree value types *--------------------------------------------------------------*/ static uint64_t pack_block_time(dm_block_t b, uint32_t t) { return (b << 24) | t; } static void unpack_block_time(uint64_t v, dm_block_t *b, uint32_t *t) { *b = v >> 24; *t = v & ((1 << 24) - 1); } |
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static void data_block_inc(void *context, const void *value_le) |
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{ struct dm_space_map *sm = context; __le64 v_le; uint64_t b; uint32_t t; memcpy(&v_le, value_le, sizeof(v_le)); unpack_block_time(le64_to_cpu(v_le), &b, &t); dm_sm_inc_block(sm, b); } |
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static void data_block_dec(void *context, const void *value_le) |
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{ struct dm_space_map *sm = context; __le64 v_le; uint64_t b; uint32_t t; memcpy(&v_le, value_le, sizeof(v_le)); unpack_block_time(le64_to_cpu(v_le), &b, &t); dm_sm_dec_block(sm, b); } |
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static int data_block_equal(void *context, const void *value1_le, const void *value2_le) |
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{ __le64 v1_le, v2_le; uint64_t b1, b2; uint32_t t; memcpy(&v1_le, value1_le, sizeof(v1_le)); memcpy(&v2_le, value2_le, sizeof(v2_le)); unpack_block_time(le64_to_cpu(v1_le), &b1, &t); unpack_block_time(le64_to_cpu(v2_le), &b2, &t); return b1 == b2; } |
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static void subtree_inc(void *context, const void *value) |
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{ struct dm_btree_info *info = context; __le64 root_le; uint64_t root; memcpy(&root_le, value, sizeof(root_le)); root = le64_to_cpu(root_le); dm_tm_inc(info->tm, root); } |
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static void subtree_dec(void *context, const void *value) |
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{ struct dm_btree_info *info = context; __le64 root_le; uint64_t root; memcpy(&root_le, value, sizeof(root_le)); root = le64_to_cpu(root_le); if (dm_btree_del(info, root)) |
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DMERR("btree delete failed"); |
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} |
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static int subtree_equal(void *context, const void *value1_le, const void *value2_le) |
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{ __le64 v1_le, v2_le; memcpy(&v1_le, value1_le, sizeof(v1_le)); memcpy(&v2_le, value2_le, sizeof(v2_le)); return v1_le == v2_le; } /*----------------------------------------------------------------*/ |
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static int superblock_lock_zero(struct dm_pool_metadata *pmd, struct dm_block **sblock) { return dm_bm_write_lock_zero(pmd->bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, sblock); } static int superblock_lock(struct dm_pool_metadata *pmd, struct dm_block **sblock) { return dm_bm_write_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, sblock); } |
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static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) |
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{ int r; unsigned i; struct dm_block *b; __le64 *data_le, zero = cpu_to_le64(0); unsigned block_size = dm_bm_block_size(bm) / sizeof(__le64); /* * We can't use a validator here - it may be all zeroes. */ r = dm_bm_read_lock(bm, THIN_SUPERBLOCK_LOCATION, NULL, &b); if (r) return r; data_le = dm_block_data(b); *result = 1; for (i = 0; i < block_size; i++) { if (data_le[i] != zero) { *result = 0; break; } } |
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dm_bm_unlock(b); return 0; |
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} |
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static void __setup_btree_details(struct dm_pool_metadata *pmd) { pmd->info.tm = pmd->tm; pmd->info.levels = 2; pmd->info.value_type.context = pmd->data_sm; pmd->info.value_type.size = sizeof(__le64); pmd->info.value_type.inc = data_block_inc; pmd->info.value_type.dec = data_block_dec; pmd->info.value_type.equal = data_block_equal; memcpy(&pmd->nb_info, &pmd->info, sizeof(pmd->nb_info)); pmd->nb_info.tm = pmd->nb_tm; pmd->tl_info.tm = pmd->tm; pmd->tl_info.levels = 1; |
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pmd->tl_info.value_type.context = &pmd->bl_info; |
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pmd->tl_info.value_type.size = sizeof(__le64); pmd->tl_info.value_type.inc = subtree_inc; pmd->tl_info.value_type.dec = subtree_dec; pmd->tl_info.value_type.equal = subtree_equal; pmd->bl_info.tm = pmd->tm; pmd->bl_info.levels = 1; pmd->bl_info.value_type.context = pmd->data_sm; pmd->bl_info.value_type.size = sizeof(__le64); pmd->bl_info.value_type.inc = data_block_inc; pmd->bl_info.value_type.dec = data_block_dec; pmd->bl_info.value_type.equal = data_block_equal; pmd->details_info.tm = pmd->tm; pmd->details_info.levels = 1; pmd->details_info.value_type.context = NULL; pmd->details_info.value_type.size = sizeof(struct disk_device_details); pmd->details_info.value_type.inc = NULL; pmd->details_info.value_type.dec = NULL; pmd->details_info.value_type.equal = NULL; } |
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static int save_sm_roots(struct dm_pool_metadata *pmd) { int r; size_t len; r = dm_sm_root_size(pmd->metadata_sm, &len); if (r < 0) return r; r = dm_sm_copy_root(pmd->metadata_sm, &pmd->metadata_space_map_root, len); if (r < 0) return r; r = dm_sm_root_size(pmd->data_sm, &len); if (r < 0) return r; return dm_sm_copy_root(pmd->data_sm, &pmd->data_space_map_root, len); } static void copy_sm_roots(struct dm_pool_metadata *pmd, struct thin_disk_superblock *disk) { memcpy(&disk->metadata_space_map_root, &pmd->metadata_space_map_root, sizeof(pmd->metadata_space_map_root)); memcpy(&disk->data_space_map_root, &pmd->data_space_map_root, sizeof(pmd->data_space_map_root)); } |
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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; |
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r = dm_sm_commit(pmd->data_sm); |
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if (r < 0) return r; |
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r = dm_tm_pre_commit(pmd->tm); |
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if (r < 0) return r; |
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r = save_sm_roots(pmd); |
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if (r < 0) return r; |
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r = superblock_lock_zero(pmd, &sblock); if (r) return r; disk_super = dm_block_data(sblock); |
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disk_super->flags = 0; |
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memset(disk_super->uuid, 0, sizeof(disk_super->uuid)); |
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disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); disk_super->version = cpu_to_le32(THIN_VERSION); disk_super->time = 0; |
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disk_super->trans_id = 0; disk_super->held_root = 0; |
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copy_sm_roots(pmd, disk_super); |
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disk_super->data_mapping_root = cpu_to_le64(pmd->root); disk_super->device_details_root = cpu_to_le64(pmd->details_root); |
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disk_super->metadata_block_size = cpu_to_le32(THIN_METADATA_BLOCK_SIZE); |
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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); |
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return dm_tm_commit(pmd->tm, sblock); |
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} |
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static int __format_metadata(struct dm_pool_metadata *pmd) |
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{ int r; |
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|
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r = dm_tm_create_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, &pmd->tm, &pmd->metadata_sm); if (r < 0) { DMERR("tm_create_with_sm failed"); return r; } |
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pmd->data_sm = dm_sm_disk_create(pmd->tm, 0); |
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if (IS_ERR(pmd->data_sm)) { DMERR("sm_disk_create failed"); r = PTR_ERR(pmd->data_sm); |
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goto bad_cleanup_tm; |
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} |
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pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); |
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if (!pmd->nb_tm) { |
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DMERR("could not create non-blocking clone tm"); |
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r = -ENOMEM; |
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goto bad_cleanup_data_sm; |
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} |
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__setup_btree_details(pmd); |
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r = dm_btree_empty(&pmd->info, &pmd->root); if (r < 0) |
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goto bad_cleanup_nb_tm; |
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r = dm_btree_empty(&pmd->details_info, &pmd->details_root); if (r < 0) { DMERR("couldn't create devices root"); |
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goto bad_cleanup_nb_tm; |
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} r = __write_initial_superblock(pmd); if (r) |
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goto bad_cleanup_nb_tm; |
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|
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return 0; |
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bad_cleanup_nb_tm: dm_tm_destroy(pmd->nb_tm); bad_cleanup_data_sm: |
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dm_sm_destroy(pmd->data_sm); |
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bad_cleanup_tm: |
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dm_tm_destroy(pmd->tm); dm_sm_destroy(pmd->metadata_sm); |
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return r; } |
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static int __check_incompat_features(struct thin_disk_superblock *disk_super, struct dm_pool_metadata *pmd) { uint32_t features; features = le32_to_cpu(disk_super->incompat_flags) & ~THIN_FEATURE_INCOMPAT_SUPP; if (features) { DMERR("could not access metadata due to unsupported optional features (%lx).", (unsigned long)features); return -EINVAL; } /* * Check for read-only metadata to skip the following RDWR checks. */ if (get_disk_ro(pmd->bdev->bd_disk)) return 0; features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP; if (features) { DMERR("could not access metadata RDWR due to unsupported optional features (%lx).", (unsigned long)features); return -EINVAL; } return 0; } |
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static int __open_metadata(struct dm_pool_metadata *pmd) { int r; struct dm_block *sblock; struct thin_disk_superblock *disk_super; r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, &sblock); if (r < 0) { DMERR("couldn't read superblock"); return r; } disk_super = dm_block_data(sblock); |
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|
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/* Verify the data block size hasn't changed */ if (le32_to_cpu(disk_super->data_block_size) != pmd->data_block_size) { DMERR("changing the data block size (from %u to %llu) is not supported", le32_to_cpu(disk_super->data_block_size), (unsigned long long)pmd->data_block_size); r = -EINVAL; goto bad_unlock_sblock; } |
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r = __check_incompat_features(disk_super, pmd); |
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if (r < 0) goto bad_unlock_sblock; |
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|
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r = dm_tm_open_with_sm(pmd->bm, THIN_SUPERBLOCK_LOCATION, disk_super->metadata_space_map_root, sizeof(disk_super->metadata_space_map_root), &pmd->tm, &pmd->metadata_sm); if (r < 0) { DMERR("tm_open_with_sm failed"); |
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goto bad_unlock_sblock; |
e4d2205cd dm thin metadata:... |
620 621 622 623 624 625 |
} pmd->data_sm = dm_sm_disk_open(pmd->tm, disk_super->data_space_map_root, sizeof(disk_super->data_space_map_root)); if (IS_ERR(pmd->data_sm)) { DMERR("sm_disk_open failed"); |
e4d2205cd dm thin metadata:... |
626 |
r = PTR_ERR(pmd->data_sm); |
0fa5b17b0 dm thin metadata:... |
627 |
goto bad_cleanup_tm; |
e4d2205cd dm thin metadata:... |
628 |
} |
e4d2205cd dm thin metadata:... |
629 630 |
pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm); if (!pmd->nb_tm) { |
0fa5b17b0 dm thin metadata:... |
631 |
DMERR("could not create non-blocking clone tm"); |
e4d2205cd dm thin metadata:... |
632 |
r = -ENOMEM; |
0fa5b17b0 dm thin metadata:... |
633 |
goto bad_cleanup_data_sm; |
e4d2205cd dm thin metadata:... |
634 635 636 |
} __setup_btree_details(pmd); |
4c7da06f5 dm persistent dat... |
637 638 639 |
dm_bm_unlock(sblock); return 0; |
e4d2205cd dm thin metadata:... |
640 |
|
0fa5b17b0 dm thin metadata:... |
641 |
bad_cleanup_data_sm: |
e4d2205cd dm thin metadata:... |
642 |
dm_sm_destroy(pmd->data_sm); |
0fa5b17b0 dm thin metadata:... |
643 |
bad_cleanup_tm: |
e4d2205cd dm thin metadata:... |
644 645 |
dm_tm_destroy(pmd->tm); dm_sm_destroy(pmd->metadata_sm); |
0fa5b17b0 dm thin metadata:... |
646 647 |
bad_unlock_sblock: dm_bm_unlock(sblock); |
e4d2205cd dm thin metadata:... |
648 649 650 |
return r; } |
66b1edc05 dm thin metadata:... |
651 |
static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device) |
e4d2205cd dm thin metadata:... |
652 |
{ |
8801e0694 dm thin metadata:... |
653 |
int r, unformatted; |
237074c0a dm thin metadata:... |
654 |
|
8801e0694 dm thin metadata:... |
655 |
r = __superblock_all_zeroes(pmd->bm, &unformatted); |
237074c0a dm thin metadata:... |
656 657 |
if (r) return r; |
8801e0694 dm thin metadata:... |
658 |
if (unformatted) |
66b1edc05 dm thin metadata:... |
659 660 661 |
return format_device ? __format_metadata(pmd) : -EPERM; return __open_metadata(pmd); |
e4d2205cd dm thin metadata:... |
662 |
} |
66b1edc05 dm thin metadata:... |
663 |
static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device) |
332627db0 dm thin metadata:... |
664 665 |
{ int r; |
7d48935ef dm thin: allow me... |
666 |
pmd->bm = dm_block_manager_create(pmd->bdev, THIN_METADATA_BLOCK_SIZE << SECTOR_SHIFT, |
332627db0 dm thin metadata:... |
667 668 669 670 671 |
THIN_MAX_CONCURRENT_LOCKS); if (IS_ERR(pmd->bm)) { DMERR("could not create block manager"); return PTR_ERR(pmd->bm); } |
66b1edc05 dm thin metadata:... |
672 |
r = __open_or_format_metadata(pmd, format_device); |
332627db0 dm thin metadata:... |
673 674 675 676 677 |
if (r) dm_block_manager_destroy(pmd->bm); return r; } |
f9dd9352b dm thin metadata:... |
678 679 680 681 682 683 684 685 |
static void __destroy_persistent_data_objects(struct dm_pool_metadata *pmd) { dm_sm_destroy(pmd->data_sm); dm_sm_destroy(pmd->metadata_sm); dm_tm_destroy(pmd->nb_tm); dm_tm_destroy(pmd->tm); dm_block_manager_destroy(pmd->bm); } |
991d9fa02 dm: add thin prov... |
686 687 688 |
static int __begin_transaction(struct dm_pool_metadata *pmd) { int r; |
991d9fa02 dm: add thin prov... |
689 690 691 692 |
struct thin_disk_superblock *disk_super; struct dm_block *sblock; /* |
991d9fa02 dm: add thin prov... |
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
* We re-read the superblock every time. Shouldn't need to do this * really. */ r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, &sblock); if (r) return r; disk_super = dm_block_data(sblock); pmd->time = le32_to_cpu(disk_super->time); pmd->root = le64_to_cpu(disk_super->data_mapping_root); pmd->details_root = le64_to_cpu(disk_super->device_details_root); pmd->trans_id = le64_to_cpu(disk_super->trans_id); pmd->flags = le32_to_cpu(disk_super->flags); pmd->data_block_size = le32_to_cpu(disk_super->data_block_size); |
991d9fa02 dm: add thin prov... |
708 |
dm_bm_unlock(sblock); |
d73ec5253 dm thin metadata:... |
709 |
return 0; |
991d9fa02 dm: add thin prov... |
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
} static int __write_changed_details(struct dm_pool_metadata *pmd) { int r; struct dm_thin_device *td, *tmp; struct disk_device_details details; uint64_t key; list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { if (!td->changed) continue; key = td->id; details.mapped_blocks = cpu_to_le64(td->mapped_blocks); details.transaction_id = cpu_to_le64(td->transaction_id); details.creation_time = cpu_to_le32(td->creation_time); details.snapshotted_time = cpu_to_le32(td->snapshotted_time); __dm_bless_for_disk(&details); r = dm_btree_insert(&pmd->details_info, pmd->details_root, &key, &details, &pmd->details_root); if (r) return r; if (td->open_count) td->changed = 0; else { list_del(&td->list); kfree(td); } |
991d9fa02 dm: add thin prov... |
742 743 744 745 746 747 748 |
} return 0; } static int __commit_transaction(struct dm_pool_metadata *pmd) { |
991d9fa02 dm: add thin prov... |
749 750 751 752 753 754 755 756 757 758 759 760 |
int r; size_t metadata_len, data_len; struct thin_disk_superblock *disk_super; struct dm_block *sblock; /* * We need to know if the thin_disk_superblock exceeds a 512-byte sector. */ BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); r = __write_changed_details(pmd); if (r < 0) |
d973ac196 dm thin metadata:... |
761 |
return r; |
991d9fa02 dm: add thin prov... |
762 |
|
991d9fa02 dm: add thin prov... |
763 764 |
r = dm_sm_commit(pmd->data_sm); if (r < 0) |
d973ac196 dm thin metadata:... |
765 |
return r; |
991d9fa02 dm: add thin prov... |
766 767 768 |
r = dm_tm_pre_commit(pmd->tm); if (r < 0) |
d973ac196 dm thin metadata:... |
769 |
return r; |
991d9fa02 dm: add thin prov... |
770 771 772 |
r = dm_sm_root_size(pmd->metadata_sm, &metadata_len); if (r < 0) |
d973ac196 dm thin metadata:... |
773 |
return r; |
991d9fa02 dm: add thin prov... |
774 |
|
fef838cc1 dm thin metadata:... |
775 |
r = dm_sm_root_size(pmd->data_sm, &data_len); |
991d9fa02 dm: add thin prov... |
776 |
if (r < 0) |
d973ac196 dm thin metadata:... |
777 |
return r; |
991d9fa02 dm: add thin prov... |
778 |
|
5a32083d0 dm: take care to ... |
779 780 781 |
r = save_sm_roots(pmd); if (r < 0) return r; |
259711920 dm thin metadata:... |
782 |
r = superblock_lock(pmd, &sblock); |
991d9fa02 dm: add thin prov... |
783 |
if (r) |
d973ac196 dm thin metadata:... |
784 |
return r; |
991d9fa02 dm: add thin prov... |
785 786 787 788 789 790 791 |
disk_super = dm_block_data(sblock); disk_super->time = cpu_to_le32(pmd->time); disk_super->data_mapping_root = cpu_to_le64(pmd->root); disk_super->device_details_root = cpu_to_le64(pmd->details_root); disk_super->trans_id = cpu_to_le64(pmd->trans_id); disk_super->flags = cpu_to_le32(pmd->flags); |
5a32083d0 dm: take care to ... |
792 |
copy_sm_roots(pmd, disk_super); |
991d9fa02 dm: add thin prov... |
793 |
|
eb04cf634 dm thin metadata:... |
794 |
return dm_tm_commit(pmd->tm, sblock); |
991d9fa02 dm: add thin prov... |
795 |
} |
1484d4ff2 dm thin metadata:... |
796 797 798 799 800 801 802 803 804 805 |
static void __set_metadata_reserve(struct dm_pool_metadata *pmd) { int r; dm_block_t total; dm_block_t max_blocks = 4096; /* 16M */ r = dm_sm_get_nr_blocks(pmd->metadata_sm, &total); if (r) { DMERR("could not get size of metadata device"); pmd->metadata_reserve = max_blocks; |
4e7ea6512 dm thin metadata:... |
806 807 |
} else pmd->metadata_reserve = min(max_blocks, div_u64(total, 10)); |
1484d4ff2 dm thin metadata:... |
808 |
} |
991d9fa02 dm: add thin prov... |
809 |
struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, |
66b1edc05 dm thin metadata:... |
810 811 |
sector_t data_block_size, bool format_device) |
991d9fa02 dm: add thin prov... |
812 813 |
{ int r; |
991d9fa02 dm: add thin prov... |
814 |
struct dm_pool_metadata *pmd; |
991d9fa02 dm: add thin prov... |
815 816 817 818 819 820 |
pmd = kmalloc(sizeof(*pmd), GFP_KERNEL); if (!pmd) { DMERR("could not allocate metadata struct"); return ERR_PTR(-ENOMEM); } |
6a0ebd31b dm thin metadata:... |
821 822 823 |
init_rwsem(&pmd->root_lock); pmd->time = 0; INIT_LIST_HEAD(&pmd->thin_devices); |
da105ed5f dm thin metadata:... |
824 |
pmd->fail_io = false; |
332627db0 dm thin metadata:... |
825 |
pmd->bdev = bdev; |
9cb6653f9 dm thin metadata:... |
826 |
pmd->data_block_size = data_block_size; |
991d9fa02 dm: add thin prov... |
827 |
|
66b1edc05 dm thin metadata:... |
828 |
r = __create_persistent_data_objects(pmd, format_device); |
991d9fa02 dm: add thin prov... |
829 |
if (r) { |
991d9fa02 dm: add thin prov... |
830 831 832 |
kfree(pmd); return ERR_PTR(r); } |
991d9fa02 dm: add thin prov... |
833 |
|
270938bac dm thin metadata:... |
834 835 836 837 838 |
r = __begin_transaction(pmd); if (r < 0) { if (dm_pool_metadata_close(pmd) < 0) DMWARN("%s: dm_pool_metadata_close() failed.", __func__); return ERR_PTR(r); |
991d9fa02 dm: add thin prov... |
839 |
} |
1484d4ff2 dm thin metadata:... |
840 |
__set_metadata_reserve(pmd); |
991d9fa02 dm: add thin prov... |
841 |
return pmd; |
991d9fa02 dm: add thin prov... |
842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 |
} int dm_pool_metadata_close(struct dm_pool_metadata *pmd) { int r; unsigned open_devices = 0; struct dm_thin_device *td, *tmp; down_read(&pmd->root_lock); list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { if (td->open_count) open_devices++; else { list_del(&td->list); kfree(td); } } up_read(&pmd->root_lock); if (open_devices) { DMERR("attempt to close pmd when %u device(s) are still open", open_devices); return -EBUSY; } |
49f154c73 dm thin metadata:... |
866 |
if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) { |
12ba58af4 dm thin metadata:... |
867 868 869 870 871 |
r = __commit_transaction(pmd); if (r < 0) DMWARN("%s: __commit_transaction() failed, error = %d", __func__, r); } |
991d9fa02 dm: add thin prov... |
872 |
|
da105ed5f dm thin metadata:... |
873 874 |
if (!pmd->fail_io) __destroy_persistent_data_objects(pmd); |
991d9fa02 dm: add thin prov... |
875 |
|
da105ed5f dm thin metadata:... |
876 |
kfree(pmd); |
991d9fa02 dm: add thin prov... |
877 878 |
return 0; } |
1f3db25d8 dm thin metadata:... |
879 880 881 882 883 |
/* * __open_device: Returns @td corresponding to device with id @dev, * creating it if @create is set and incrementing @td->open_count. * On failure, @td is undefined. */ |
991d9fa02 dm: add thin prov... |
884 885 886 887 888 889 890 891 892 893 |
static int __open_device(struct dm_pool_metadata *pmd, dm_thin_id dev, int create, struct dm_thin_device **td) { int r, changed = 0; struct dm_thin_device *td2; uint64_t key = dev; struct disk_device_details details_le; /* |
1f3db25d8 dm thin metadata:... |
894 |
* If the device is already open, return it. |
991d9fa02 dm: add thin prov... |
895 896 897 |
*/ list_for_each_entry(td2, &pmd->thin_devices, list) if (td2->id == dev) { |
1f3db25d8 dm thin metadata:... |
898 899 900 901 902 |
/* * May not create an already-open device. */ if (create) return -EEXIST; |
991d9fa02 dm: add thin prov... |
903 904 905 906 907 908 909 910 911 912 913 914 915 |
td2->open_count++; *td = td2; return 0; } /* * Check the device exists. */ r = dm_btree_lookup(&pmd->details_info, pmd->details_root, &key, &details_le); if (r) { if (r != -ENODATA || !create) return r; |
1f3db25d8 dm thin metadata:... |
916 917 918 |
/* * Create new device. */ |
991d9fa02 dm: add thin prov... |
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 |
changed = 1; details_le.mapped_blocks = 0; details_le.transaction_id = cpu_to_le64(pmd->trans_id); details_le.creation_time = cpu_to_le32(pmd->time); details_le.snapshotted_time = cpu_to_le32(pmd->time); } *td = kmalloc(sizeof(**td), GFP_NOIO); if (!*td) return -ENOMEM; (*td)->pmd = pmd; (*td)->id = dev; (*td)->open_count = 1; (*td)->changed = changed; |
da105ed5f dm thin metadata:... |
934 |
(*td)->aborted_with_changes = false; |
991d9fa02 dm: add thin prov... |
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 |
(*td)->mapped_blocks = le64_to_cpu(details_le.mapped_blocks); (*td)->transaction_id = le64_to_cpu(details_le.transaction_id); (*td)->creation_time = le32_to_cpu(details_le.creation_time); (*td)->snapshotted_time = le32_to_cpu(details_le.snapshotted_time); list_add(&(*td)->list, &pmd->thin_devices); return 0; } static void __close_device(struct dm_thin_device *td) { --td->open_count; } static int __create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) { int r; dm_block_t dev_root; uint64_t key = dev; struct disk_device_details details_le; struct dm_thin_device *td; __le64 value; r = dm_btree_lookup(&pmd->details_info, pmd->details_root, &key, &details_le); if (!r) return -EEXIST; /* * Create an empty btree for the mappings. */ r = dm_btree_empty(&pmd->bl_info, &dev_root); if (r) return r; /* * Insert it into the main mapping tree. */ value = cpu_to_le64(dev_root); __dm_bless_for_disk(&value); r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); if (r) { dm_btree_del(&pmd->bl_info, dev_root); return r; } r = __open_device(pmd, dev, 1, &td); if (r) { |
991d9fa02 dm: add thin prov... |
985 986 987 988 |
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); dm_btree_del(&pmd->bl_info, dev_root); return r; } |
991d9fa02 dm: add thin prov... |
989 990 991 992 993 994 995 |
__close_device(td); return r; } int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev) { |
da105ed5f dm thin metadata:... |
996 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
997 998 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
999 1000 |
if (!pmd->fail_io) r = __create_thin(pmd, dev); |
991d9fa02 dm: add thin prov... |
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 |
up_write(&pmd->root_lock); return r; } static int __set_snapshot_details(struct dm_pool_metadata *pmd, struct dm_thin_device *snap, dm_thin_id origin, uint32_t time) { int r; struct dm_thin_device *td; r = __open_device(pmd, origin, 0, &td); if (r) return r; td->changed = 1; td->snapshotted_time = time; snap->mapped_blocks = td->mapped_blocks; snap->snapshotted_time = time; __close_device(td); return 0; } static int __create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev, dm_thin_id origin) { int r; dm_block_t origin_root; uint64_t key = origin, dev_key = dev; struct dm_thin_device *td; struct disk_device_details details_le; __le64 value; /* check this device is unused */ r = dm_btree_lookup(&pmd->details_info, pmd->details_root, &dev_key, &details_le); if (!r) return -EEXIST; /* find the mapping tree for the origin */ r = dm_btree_lookup(&pmd->tl_info, pmd->root, &key, &value); if (r) return r; origin_root = le64_to_cpu(value); /* clone the origin, an inc will do */ dm_tm_inc(pmd->tm, origin_root); /* insert into the main mapping tree */ value = cpu_to_le64(origin_root); __dm_bless_for_disk(&value); key = dev; r = dm_btree_insert(&pmd->tl_info, pmd->root, &key, &value, &pmd->root); if (r) { dm_tm_dec(pmd->tm, origin_root); return r; } pmd->time++; r = __open_device(pmd, dev, 1, &td); if (r) goto bad; r = __set_snapshot_details(pmd, td, origin, pmd->time); |
1f3db25d8 dm thin metadata:... |
1069 |
__close_device(td); |
991d9fa02 dm: add thin prov... |
1070 1071 |
if (r) goto bad; |
991d9fa02 dm: add thin prov... |
1072 1073 1074 |
return 0; bad: |
991d9fa02 dm: add thin prov... |
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 |
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); dm_btree_remove(&pmd->details_info, pmd->details_root, &key, &pmd->details_root); return r; } int dm_pool_create_snap(struct dm_pool_metadata *pmd, dm_thin_id dev, dm_thin_id origin) { |
da105ed5f dm thin metadata:... |
1085 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1086 1087 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1088 1089 |
if (!pmd->fail_io) r = __create_snap(pmd, dev, origin); |
991d9fa02 dm: add thin prov... |
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 |
up_write(&pmd->root_lock); return r; } static int __delete_device(struct dm_pool_metadata *pmd, dm_thin_id dev) { int r; uint64_t key = dev; struct dm_thin_device *td; /* TODO: failure should mark the transaction invalid */ r = __open_device(pmd, dev, 0, &td); if (r) return r; if (td->open_count > 1) { __close_device(td); return -EBUSY; } list_del(&td->list); kfree(td); r = dm_btree_remove(&pmd->details_info, pmd->details_root, &key, &pmd->details_root); if (r) return r; r = dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root); if (r) return r; |
991d9fa02 dm: add thin prov... |
1121 1122 1123 1124 1125 1126 |
return 0; } int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev) { |
da105ed5f dm thin metadata:... |
1127 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1128 1129 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1130 1131 |
if (!pmd->fail_io) r = __delete_device(pmd, dev); |
991d9fa02 dm: add thin prov... |
1132 1133 1134 1135 1136 1137 1138 1139 1140 |
up_write(&pmd->root_lock); return r; } int dm_pool_set_metadata_transaction_id(struct dm_pool_metadata *pmd, uint64_t current_id, uint64_t new_id) { |
da105ed5f dm thin metadata:... |
1141 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1142 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1143 1144 1145 |
if (pmd->fail_io) goto out; |
991d9fa02 dm: add thin prov... |
1146 |
if (pmd->trans_id != current_id) { |
991d9fa02 dm: add thin prov... |
1147 |
DMERR("mismatched transaction id"); |
da105ed5f dm thin metadata:... |
1148 |
goto out; |
991d9fa02 dm: add thin prov... |
1149 1150 1151 |
} pmd->trans_id = new_id; |
da105ed5f dm thin metadata:... |
1152 1153 1154 |
r = 0; out: |
991d9fa02 dm: add thin prov... |
1155 |
up_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1156 |
return r; |
991d9fa02 dm: add thin prov... |
1157 1158 1159 1160 1161 |
} int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd, uint64_t *result) { |
da105ed5f dm thin metadata:... |
1162 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1163 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1164 1165 1166 1167 |
if (!pmd->fail_io) { *result = pmd->trans_id; r = 0; } |
991d9fa02 dm: add thin prov... |
1168 |
up_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1169 |
return r; |
991d9fa02 dm: add thin prov... |
1170 |
} |
cc8394d86 dm thin: provide ... |
1171 1172 1173 1174 1175 1176 1177 1178 |
static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) { int r, inc; struct thin_disk_superblock *disk_super; struct dm_block *copy, *sblock; dm_block_t held_root; /* |
49e99fc71 dm thin metadata:... |
1179 1180 1181 1182 1183 1184 |
* We commit to ensure the btree roots which we increment in a * moment are up to date. */ __commit_transaction(pmd); /* |
cc8394d86 dm thin: provide ... |
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 |
* Copy the superblock. */ dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); r = dm_tm_shadow_block(pmd->tm, THIN_SUPERBLOCK_LOCATION, &sb_validator, ©, &inc); if (r) return r; BUG_ON(!inc); held_root = dm_block_location(copy); disk_super = dm_block_data(copy); if (le64_to_cpu(disk_super->held_root)) { DMWARN("Pool metadata snapshot already exists: release this before taking another."); dm_tm_dec(pmd->tm, held_root); dm_tm_unlock(pmd->tm, copy); |
cc8394d86 dm thin: provide ... |
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 |
return -EBUSY; } /* * Wipe the spacemap since we're not publishing this. */ memset(&disk_super->data_space_map_root, 0, sizeof(disk_super->data_space_map_root)); memset(&disk_super->metadata_space_map_root, 0, sizeof(disk_super->metadata_space_map_root)); /* * Increment the data structures that need to be preserved. */ dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->data_mapping_root)); dm_tm_inc(pmd->tm, le64_to_cpu(disk_super->device_details_root)); dm_tm_unlock(pmd->tm, copy); /* * Write the held root into the superblock. */ |
259711920 dm thin metadata:... |
1224 |
r = superblock_lock(pmd, &sblock); |
cc8394d86 dm thin: provide ... |
1225 1226 |
if (r) { dm_tm_dec(pmd->tm, held_root); |
cc8394d86 dm thin: provide ... |
1227 1228 1229 1230 1231 1232 |
return r; } disk_super = dm_block_data(sblock); disk_super->held_root = cpu_to_le64(held_root); dm_bm_unlock(sblock); |
cc8394d86 dm thin: provide ... |
1233 1234 1235 1236 1237 |
return 0; } int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd) { |
da105ed5f dm thin metadata:... |
1238 |
int r = -EINVAL; |
cc8394d86 dm thin: provide ... |
1239 1240 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1241 1242 |
if (!pmd->fail_io) r = __reserve_metadata_snap(pmd); |
cc8394d86 dm thin: provide ... |
1243 1244 1245 1246 1247 1248 |
up_write(&pmd->root_lock); return r; } static int __release_metadata_snap(struct dm_pool_metadata *pmd) |
991d9fa02 dm: add thin prov... |
1249 1250 1251 |
{ int r; struct thin_disk_superblock *disk_super; |
cc8394d86 dm thin: provide ... |
1252 1253 |
struct dm_block *sblock, *copy; dm_block_t held_root; |
991d9fa02 dm: add thin prov... |
1254 |
|
259711920 dm thin metadata:... |
1255 |
r = superblock_lock(pmd, &sblock); |
991d9fa02 dm: add thin prov... |
1256 1257 1258 1259 |
if (r) return r; disk_super = dm_block_data(sblock); |
cc8394d86 dm thin: provide ... |
1260 1261 |
held_root = le64_to_cpu(disk_super->held_root); disk_super->held_root = cpu_to_le64(0); |
cc8394d86 dm thin: provide ... |
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 |
dm_bm_unlock(sblock); if (!held_root) { DMWARN("No pool metadata snapshot found: nothing to release."); return -EINVAL; } r = dm_tm_read_lock(pmd->tm, held_root, &sb_validator, ©); if (r) return r; disk_super = dm_block_data(copy); |
7f518ad0a dm thin metadata:... |
1275 1276 |
dm_btree_del(&pmd->info, le64_to_cpu(disk_super->data_mapping_root)); dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); |
cc8394d86 dm thin: provide ... |
1277 |
dm_sm_dec_block(pmd->metadata_sm, held_root); |
4c7da06f5 dm persistent dat... |
1278 1279 1280 |
dm_tm_unlock(pmd->tm, copy); return 0; |
cc8394d86 dm thin: provide ... |
1281 1282 1283 1284 |
} int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) { |
da105ed5f dm thin metadata:... |
1285 |
int r = -EINVAL; |
cc8394d86 dm thin: provide ... |
1286 1287 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1288 1289 |
if (!pmd->fail_io) r = __release_metadata_snap(pmd); |
cc8394d86 dm thin: provide ... |
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 |
up_write(&pmd->root_lock); return r; } static int __get_metadata_snap(struct dm_pool_metadata *pmd, dm_block_t *result) { int r; struct thin_disk_superblock *disk_super; struct dm_block *sblock; r = dm_bm_read_lock(pmd->bm, THIN_SUPERBLOCK_LOCATION, &sb_validator, &sblock); if (r) return r; disk_super = dm_block_data(sblock); |
991d9fa02 dm: add thin prov... |
1308 |
*result = le64_to_cpu(disk_super->held_root); |
4c7da06f5 dm persistent dat... |
1309 1310 1311 |
dm_bm_unlock(sblock); return 0; |
991d9fa02 dm: add thin prov... |
1312 |
} |
cc8394d86 dm thin: provide ... |
1313 1314 |
int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, dm_block_t *result) |
991d9fa02 dm: add thin prov... |
1315 |
{ |
da105ed5f dm thin metadata:... |
1316 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1317 1318 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1319 1320 |
if (!pmd->fail_io) r = __get_metadata_snap(pmd, result); |
991d9fa02 dm: add thin prov... |
1321 1322 1323 1324 1325 1326 1327 1328 |
up_read(&pmd->root_lock); return r; } int dm_pool_open_thin_device(struct dm_pool_metadata *pmd, dm_thin_id dev, struct dm_thin_device **td) { |
da105ed5f dm thin metadata:... |
1329 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1330 1331 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1332 1333 |
if (!pmd->fail_io) r = __open_device(pmd, dev, 0, td); |
991d9fa02 dm: add thin prov... |
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 |
up_write(&pmd->root_lock); return r; } int dm_pool_close_thin_device(struct dm_thin_device *td) { down_write(&td->pmd->root_lock); __close_device(td); up_write(&td->pmd->root_lock); return 0; } dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) { return td->id; } |
19fa1a675 dm thin: fix disc... |
1352 1353 1354 1355 1356 1357 |
/* * Check whether @time (of block creation) is older than @td's last snapshot. * If so then the associated block is shared with the last snapshot device. * Any block on a device created *after* the device last got snapshotted is * necessarily not shared. */ |
17b7d63f7 dm thin: clean up... |
1358 |
static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) |
991d9fa02 dm: add thin prov... |
1359 1360 1361 |
{ return td->snapshotted_time > time; } |
3d5f67332 dm thin metadata:... |
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
static void unpack_lookup_result(struct dm_thin_device *td, __le64 value, struct dm_thin_lookup_result *result) { uint64_t block_time = 0; dm_block_t exception_block; uint32_t exception_time; block_time = le64_to_cpu(value); unpack_block_time(block_time, &exception_block, &exception_time); result->block = exception_block; result->shared = __snapshotted_since(td, exception_time); } |
086fbbbda dm thin metadata:... |
1374 1375 |
static int __find_block(struct dm_thin_device *td, dm_block_t block, int can_issue_io, struct dm_thin_lookup_result *result) |
991d9fa02 dm: add thin prov... |
1376 |
{ |
e5cfc69a5 dm thin metadata:... |
1377 |
int r; |
991d9fa02 dm: add thin prov... |
1378 1379 1380 |
__le64 value; struct dm_pool_metadata *pmd = td->pmd; dm_block_t keys[2] = { td->id, block }; |
da105ed5f dm thin metadata:... |
1381 |
struct dm_btree_info *info; |
991d9fa02 dm: add thin prov... |
1382 |
|
e5cfc69a5 dm thin metadata:... |
1383 1384 1385 1386 |
if (can_issue_io) { info = &pmd->info; } else info = &pmd->nb_info; |
da105ed5f dm thin metadata:... |
1387 |
|
e5cfc69a5 dm thin metadata:... |
1388 |
r = dm_btree_lookup(info, pmd->root, keys, &value); |
3d5f67332 dm thin metadata:... |
1389 1390 |
if (!r) unpack_lookup_result(td, value, result); |
3d5f67332 dm thin metadata:... |
1391 1392 |
return r; } |
086fbbbda dm thin metadata:... |
1393 1394 |
int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, int can_issue_io, struct dm_thin_lookup_result *result) |
3d5f67332 dm thin metadata:... |
1395 1396 |
{ int r; |
3d5f67332 dm thin metadata:... |
1397 |
struct dm_pool_metadata *pmd = td->pmd; |
3d5f67332 dm thin metadata:... |
1398 1399 1400 1401 1402 |
down_read(&pmd->root_lock); if (pmd->fail_io) { up_read(&pmd->root_lock); return -EINVAL; |
991d9fa02 dm: add thin prov... |
1403 |
} |
086fbbbda dm thin metadata:... |
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 |
r = __find_block(td, block, can_issue_io, result); up_read(&pmd->root_lock); return r; } static int __find_next_mapped_block(struct dm_thin_device *td, dm_block_t block, dm_block_t *vblock, struct dm_thin_lookup_result *result) { int r; __le64 value; struct dm_pool_metadata *pmd = td->pmd; dm_block_t keys[2] = { td->id, block }; |
3d5f67332 dm thin metadata:... |
1418 1419 1420 |
r = dm_btree_lookup_next(&pmd->info, pmd->root, keys, vblock, &value); if (!r) unpack_lookup_result(td, value, result); |
991d9fa02 dm: add thin prov... |
1421 1422 |
return r; } |
086fbbbda dm thin metadata:... |
1423 1424 1425 1426 |
static int __find_mapped_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end, dm_block_t *thin_begin, dm_block_t *thin_end, dm_block_t *pool_begin, bool *maybe_shared) |
a5d895a90 dm thin metadata:... |
1427 1428 1429 1430 1431 1432 1433 |
{ int r; dm_block_t pool_end; struct dm_thin_lookup_result lookup; if (end < begin) return -ENODATA; |
086fbbbda dm thin metadata:... |
1434 |
r = __find_next_mapped_block(td, begin, &begin, &lookup); |
3d5f67332 dm thin metadata:... |
1435 1436 |
if (r) return r; |
a5d895a90 dm thin metadata:... |
1437 |
|
3d5f67332 dm thin metadata:... |
1438 |
if (begin >= end) |
a5d895a90 dm thin metadata:... |
1439 1440 1441 1442 1443 1444 1445 1446 1447 |
return -ENODATA; *thin_begin = begin; *pool_begin = lookup.block; *maybe_shared = lookup.shared; begin++; pool_end = *pool_begin + 1; while (begin != end) { |
086fbbbda dm thin metadata:... |
1448 |
r = __find_block(td, begin, true, &lookup); |
a5d895a90 dm thin metadata:... |
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
if (r) { if (r == -ENODATA) break; else return r; } if ((lookup.block != pool_end) || (lookup.shared != *maybe_shared)) break; pool_end++; begin++; } *thin_end = begin; return 0; } |
086fbbbda dm thin metadata:... |
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 |
int dm_thin_find_mapped_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end, dm_block_t *thin_begin, dm_block_t *thin_end, dm_block_t *pool_begin, bool *maybe_shared) { int r = -EINVAL; struct dm_pool_metadata *pmd = td->pmd; down_read(&pmd->root_lock); if (!pmd->fail_io) { r = __find_mapped_range(td, begin, end, thin_begin, thin_end, pool_begin, maybe_shared); } up_read(&pmd->root_lock); return r; } |
991d9fa02 dm: add thin prov... |
1484 1485 1486 1487 1488 1489 1490 |
static int __insert(struct dm_thin_device *td, dm_block_t block, dm_block_t data_block) { int r, inserted; __le64 value; struct dm_pool_metadata *pmd = td->pmd; dm_block_t keys[2] = { td->id, block }; |
991d9fa02 dm: add thin prov... |
1491 1492 1493 1494 1495 1496 1497 |
value = cpu_to_le64(pack_block_time(data_block, pmd->time)); __dm_bless_for_disk(&value); r = dm_btree_insert_notify(&pmd->info, pmd->root, keys, &value, &pmd->root, &inserted); if (r) return r; |
40db5a537 dm thin metadata:... |
1498 1499 |
td->changed = 1; if (inserted) |
991d9fa02 dm: add thin prov... |
1500 |
td->mapped_blocks++; |
991d9fa02 dm: add thin prov... |
1501 1502 1503 1504 1505 1506 1507 |
return 0; } int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, dm_block_t data_block) { |
da105ed5f dm thin metadata:... |
1508 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1509 1510 |
down_write(&td->pmd->root_lock); |
da105ed5f dm thin metadata:... |
1511 1512 |
if (!td->pmd->fail_io) r = __insert(td, block, data_block); |
991d9fa02 dm: add thin prov... |
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 |
up_write(&td->pmd->root_lock); return r; } static int __remove(struct dm_thin_device *td, dm_block_t block) { int r; struct dm_pool_metadata *pmd = td->pmd; dm_block_t keys[2] = { td->id, block }; r = dm_btree_remove(&pmd->info, pmd->root, keys, &pmd->root); if (r) return r; |
af63bcb81 dm thin metadata:... |
1527 1528 |
td->mapped_blocks--; td->changed = 1; |
991d9fa02 dm: add thin prov... |
1529 1530 1531 |
return 0; } |
6550f075f dm thin metadata:... |
1532 1533 1534 |
static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) { int r; |
993ceab91 dm thin metadata:... |
1535 |
unsigned count, total_count = 0; |
6550f075f dm thin metadata:... |
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 |
struct dm_pool_metadata *pmd = td->pmd; dm_block_t keys[1] = { td->id }; __le64 value; dm_block_t mapping_root; /* * Find the mapping tree */ r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); if (r) return r; /* * Remove from the mapping tree, taking care to inc the * ref count so it doesn't get deleted. */ mapping_root = le64_to_cpu(value); dm_tm_inc(pmd->tm, mapping_root); r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); if (r) return r; |
993ceab91 dm thin metadata:... |
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 |
/* * Remove leaves stops at the first unmapped entry, so we have to * loop round finding mapped ranges. */ while (begin < end) { r = dm_btree_lookup_next(&pmd->bl_info, mapping_root, &begin, &begin, &value); if (r == -ENODATA) break; if (r) return r; if (begin >= end) break; r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); if (r) return r; total_count += count; } |
6550f075f dm thin metadata:... |
1578 |
|
993ceab91 dm thin metadata:... |
1579 |
td->mapped_blocks -= total_count; |
6550f075f dm thin metadata:... |
1580 1581 1582 1583 1584 1585 1586 1587 1588 |
td->changed = 1; /* * Reinsert the mapping tree. */ value = cpu_to_le64(mapping_root); __dm_bless_for_disk(&value); return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); } |
991d9fa02 dm: add thin prov... |
1589 1590 |
int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) { |
da105ed5f dm thin metadata:... |
1591 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1592 1593 |
down_write(&td->pmd->root_lock); |
da105ed5f dm thin metadata:... |
1594 1595 |
if (!td->pmd->fail_io) r = __remove(td, block); |
991d9fa02 dm: add thin prov... |
1596 |
up_write(&td->pmd->root_lock); |
19fa1a675 dm thin: fix disc... |
1597 1598 1599 |
return r; } |
6550f075f dm thin metadata:... |
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 |
int dm_thin_remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) { int r = -EINVAL; down_write(&td->pmd->root_lock); if (!td->pmd->fail_io) r = __remove_range(td, begin, end); up_write(&td->pmd->root_lock); return r; } |
294710ddf dm thin: fix pass... |
1612 |
int dm_pool_block_is_shared(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) |
19fa1a675 dm thin: fix disc... |
1613 1614 1615 1616 1617 1618 1619 |
{ int r; uint32_t ref_count; down_read(&pmd->root_lock); r = dm_sm_get_count(pmd->data_sm, b, &ref_count); if (!r) |
294710ddf dm thin: fix pass... |
1620 |
*result = (ref_count > 1); |
19fa1a675 dm thin: fix disc... |
1621 |
up_read(&pmd->root_lock); |
991d9fa02 dm: add thin prov... |
1622 1623 1624 |
return r; } |
2a0fbffb1 dm thin: fix a ra... |
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 |
int dm_pool_inc_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) { int r = 0; down_write(&pmd->root_lock); for (; b != e; b++) { r = dm_sm_inc_block(pmd->data_sm, b); if (r) break; } up_write(&pmd->root_lock); return r; } int dm_pool_dec_data_range(struct dm_pool_metadata *pmd, dm_block_t b, dm_block_t e) { int r = 0; down_write(&pmd->root_lock); for (; b != e; b++) { r = dm_sm_dec_block(pmd->data_sm, b); if (r) break; } up_write(&pmd->root_lock); return r; } |
40db5a537 dm thin metadata:... |
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 |
bool dm_thin_changed_this_transaction(struct dm_thin_device *td) { int r; down_read(&td->pmd->root_lock); r = td->changed; up_read(&td->pmd->root_lock); return r; } |
4d1662a30 dm thin: avoid me... |
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 |
bool dm_pool_changed_this_transaction(struct dm_pool_metadata *pmd) { bool r = false; struct dm_thin_device *td, *tmp; down_read(&pmd->root_lock); list_for_each_entry_safe(td, tmp, &pmd->thin_devices, list) { if (td->changed) { r = td->changed; break; } } up_read(&pmd->root_lock); return r; } |
da105ed5f dm thin metadata:... |
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 |
bool dm_thin_aborted_changes(struct dm_thin_device *td) { bool r; down_read(&td->pmd->root_lock); r = td->aborted_with_changes; up_read(&td->pmd->root_lock); return r; } |
991d9fa02 dm: add thin prov... |
1690 1691 |
int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1692 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1693 1694 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1695 1696 |
if (!pmd->fail_io) r = dm_sm_new_block(pmd->data_sm, result); |
991d9fa02 dm: add thin prov... |
1697 1698 1699 1700 1701 1702 1703 |
up_write(&pmd->root_lock); return r; } int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) { |
da105ed5f dm thin metadata:... |
1704 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1705 1706 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1707 1708 |
if (pmd->fail_io) goto out; |
991d9fa02 dm: add thin prov... |
1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 |
r = __commit_transaction(pmd); if (r <= 0) goto out; /* * Open the next transaction. */ r = __begin_transaction(pmd); out: up_write(&pmd->root_lock); return r; } |
da105ed5f dm thin metadata:... |
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
static void __set_abort_with_changes_flags(struct dm_pool_metadata *pmd) { struct dm_thin_device *td; list_for_each_entry(td, &pmd->thin_devices, list) td->aborted_with_changes = td->changed; } int dm_pool_abort_metadata(struct dm_pool_metadata *pmd) { int r = -EINVAL; down_write(&pmd->root_lock); if (pmd->fail_io) goto out; __set_abort_with_changes_flags(pmd); __destroy_persistent_data_objects(pmd); r = __create_persistent_data_objects(pmd, false); if (r) pmd->fail_io = true; out: up_write(&pmd->root_lock); return r; } |
991d9fa02 dm: add thin prov... |
1749 1750 |
int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1751 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1752 1753 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1754 1755 |
if (!pmd->fail_io) r = dm_sm_get_nr_free(pmd->data_sm, result); |
991d9fa02 dm: add thin prov... |
1756 1757 1758 1759 1760 1761 1762 1763 |
up_read(&pmd->root_lock); return r; } int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1764 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1765 1766 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1767 1768 |
if (!pmd->fail_io) r = dm_sm_get_nr_free(pmd->metadata_sm, result); |
1484d4ff2 dm thin metadata:... |
1769 1770 1771 1772 1773 1774 1775 |
if (!r) { if (*result < pmd->metadata_reserve) *result = 0; else *result -= pmd->metadata_reserve; } |
991d9fa02 dm: add thin prov... |
1776 1777 1778 1779 1780 1781 1782 1783 |
up_read(&pmd->root_lock); return r; } int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1784 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1785 1786 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1787 1788 |
if (!pmd->fail_io) r = dm_sm_get_nr_blocks(pmd->metadata_sm, result); |
991d9fa02 dm: add thin prov... |
1789 1790 1791 1792 |
up_read(&pmd->root_lock); return r; } |
991d9fa02 dm: add thin prov... |
1793 1794 |
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1795 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1796 1797 |
down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1798 1799 |
if (!pmd->fail_io) r = dm_sm_get_nr_blocks(pmd->data_sm, result); |
991d9fa02 dm: add thin prov... |
1800 1801 1802 1803 1804 1805 1806 |
up_read(&pmd->root_lock); return r; } int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1807 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1808 1809 1810 |
struct dm_pool_metadata *pmd = td->pmd; down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1811 1812 1813 1814 |
if (!pmd->fail_io) { *result = td->mapped_blocks; r = 0; } |
991d9fa02 dm: add thin prov... |
1815 |
up_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1816 |
return r; |
991d9fa02 dm: add thin prov... |
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 |
} static int __highest_block(struct dm_thin_device *td, dm_block_t *result) { int r; __le64 value_le; dm_block_t thin_root; struct dm_pool_metadata *pmd = td->pmd; r = dm_btree_lookup(&pmd->tl_info, pmd->root, &td->id, &value_le); if (r) return r; thin_root = le64_to_cpu(value_le); return dm_btree_find_highest_key(&pmd->bl_info, thin_root, result); } int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, dm_block_t *result) { |
da105ed5f dm thin metadata:... |
1838 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1839 1840 1841 |
struct dm_pool_metadata *pmd = td->pmd; down_read(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1842 1843 |
if (!pmd->fail_io) r = __highest_block(td, result); |
991d9fa02 dm: add thin prov... |
1844 1845 1846 1847 |
up_read(&pmd->root_lock); return r; } |
b17446df2 dm thin: refactor... |
1848 |
static int __resize_space_map(struct dm_space_map *sm, dm_block_t new_count) |
991d9fa02 dm: add thin prov... |
1849 1850 1851 |
{ int r; dm_block_t old_count; |
b17446df2 dm thin: refactor... |
1852 |
r = dm_sm_get_nr_blocks(sm, &old_count); |
991d9fa02 dm: add thin prov... |
1853 1854 1855 1856 1857 1858 1859 |
if (r) return r; if (new_count == old_count) return 0; if (new_count < old_count) { |
b17446df2 dm thin: refactor... |
1860 |
DMERR("cannot reduce size of space map"); |
991d9fa02 dm: add thin prov... |
1861 1862 |
return -EINVAL; } |
b17446df2 dm thin: refactor... |
1863 |
return dm_sm_extend(sm, new_count - old_count); |
991d9fa02 dm: add thin prov... |
1864 1865 1866 1867 |
} int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) { |
da105ed5f dm thin metadata:... |
1868 |
int r = -EINVAL; |
991d9fa02 dm: add thin prov... |
1869 1870 |
down_write(&pmd->root_lock); |
da105ed5f dm thin metadata:... |
1871 |
if (!pmd->fail_io) |
b17446df2 dm thin: refactor... |
1872 |
r = __resize_space_map(pmd->data_sm, new_count); |
991d9fa02 dm: add thin prov... |
1873 1874 1875 1876 |
up_write(&pmd->root_lock); return r; } |
12ba58af4 dm thin metadata:... |
1877 |
|
24347e959 dm thin: detect m... |
1878 1879 1880 1881 1882 |
int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_count) { int r = -EINVAL; down_write(&pmd->root_lock); |
1484d4ff2 dm thin metadata:... |
1883 |
if (!pmd->fail_io) { |
24347e959 dm thin: detect m... |
1884 |
r = __resize_space_map(pmd->metadata_sm, new_count); |
1484d4ff2 dm thin metadata:... |
1885 1886 1887 |
if (!r) __set_metadata_reserve(pmd); } |
24347e959 dm thin: detect m... |
1888 1889 1890 1891 |
up_write(&pmd->root_lock); return r; } |
12ba58af4 dm thin metadata:... |
1892 1893 1894 |
void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) { down_write(&pmd->root_lock); |
12ba58af4 dm thin metadata:... |
1895 1896 1897 |
dm_bm_set_read_only(pmd->bm); up_write(&pmd->root_lock); } |
ac8c3f3df dm thin: generate... |
1898 |
|
9b7aaa64f dm thin: allow po... |
1899 1900 1901 |
void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) { down_write(&pmd->root_lock); |
9b7aaa64f dm thin: allow po... |
1902 1903 1904 |
dm_bm_set_read_write(pmd->bm); up_write(&pmd->root_lock); } |
ac8c3f3df dm thin: generate... |
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 |
int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, dm_block_t threshold, dm_sm_threshold_fn fn, void *context) { int r; down_write(&pmd->root_lock); r = dm_sm_register_threshold_callback(pmd->metadata_sm, threshold, fn, context); up_write(&pmd->root_lock); return r; } |
07f2b6e03 dm thin: ensure u... |
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 |
int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd) { int r; struct dm_block *sblock; struct thin_disk_superblock *disk_super; down_write(&pmd->root_lock); pmd->flags |= THIN_METADATA_NEEDS_CHECK_FLAG; r = superblock_lock(pmd, &sblock); if (r) { DMERR("couldn't read superblock"); goto out; } disk_super = dm_block_data(sblock); disk_super->flags = cpu_to_le32(pmd->flags); dm_bm_unlock(sblock); out: up_write(&pmd->root_lock); return r; } bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd) { bool needs_check; down_read(&pmd->root_lock); needs_check = pmd->flags & THIN_METADATA_NEEDS_CHECK_FLAG; up_read(&pmd->root_lock); return needs_check; } |
8a01a6af7 dm thin: prefetch... |
1953 1954 1955 |
void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) { |
2eae9e448 dm thin metadata:... |
1956 1957 1958 1959 |
down_read(&pmd->root_lock); if (!pmd->fail_io) dm_tm_issue_prefetches(pmd->tm); up_read(&pmd->root_lock); |
8a01a6af7 dm thin: prefetch... |
1960 |
} |