diff options
author | 2016-04-11 10:41:07 +0300 | |
---|---|---|
committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/md/dm-thin-metadata.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/md/dm-thin-metadata.c')
-rw-r--r-- | kernel/drivers/md/dm-thin-metadata.c | 164 |
1 files changed, 152 insertions, 12 deletions
diff --git a/kernel/drivers/md/dm-thin-metadata.c b/kernel/drivers/md/dm-thin-metadata.c index cde1d6749..c219a053c 100644 --- a/kernel/drivers/md/dm-thin-metadata.c +++ b/kernel/drivers/md/dm-thin-metadata.c @@ -184,7 +184,6 @@ struct dm_pool_metadata { uint64_t trans_id; unsigned long flags; sector_t data_block_size; - bool read_only:1; /* * Set if a transaction has to be aborted but the attempt to roll back @@ -397,7 +396,9 @@ static int __superblock_all_zeroes(struct dm_block_manager *bm, int *result) } } - return dm_bm_unlock(b); + dm_bm_unlock(b); + + return 0; } static void __setup_btree_details(struct dm_pool_metadata *pmd) @@ -651,7 +652,9 @@ static int __open_metadata(struct dm_pool_metadata *pmd) } __setup_btree_details(pmd); - return dm_bm_unlock(sblock); + dm_bm_unlock(sblock); + + return 0; bad_cleanup_data_sm: dm_sm_destroy(pmd->data_sm); @@ -836,7 +839,6 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, init_rwsem(&pmd->root_lock); pmd->time = 0; INIT_LIST_HEAD(&pmd->thin_devices); - pmd->read_only = false; pmd->fail_io = false; pmd->bdev = bdev; pmd->data_block_size = data_block_size; @@ -880,7 +882,7 @@ int dm_pool_metadata_close(struct dm_pool_metadata *pmd) return -EBUSY; } - if (!pmd->read_only && !pmd->fail_io) { + if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) { r = __commit_transaction(pmd); if (r < 0) DMWARN("%s: __commit_transaction() failed, error = %d", @@ -1205,6 +1207,12 @@ static int __reserve_metadata_snap(struct dm_pool_metadata *pmd) dm_block_t held_root; /* + * We commit to ensure the btree roots which we increment in a + * moment are up to date. + */ + __commit_transaction(pmd); + + /* * Copy the superblock. */ dm_sm_inc_block(pmd->metadata_sm, THIN_SUPERBLOCK_LOCATION); @@ -1299,7 +1307,9 @@ static int __release_metadata_snap(struct dm_pool_metadata *pmd) dm_btree_del(&pmd->details_info, le64_to_cpu(disk_super->device_details_root)); dm_sm_dec_block(pmd->metadata_sm, held_root); - return dm_tm_unlock(pmd->tm, copy); + dm_tm_unlock(pmd->tm, copy); + + return 0; } int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd) @@ -1329,7 +1339,9 @@ static int __get_metadata_snap(struct dm_pool_metadata *pmd, disk_super = dm_block_data(sblock); *result = le64_to_cpu(disk_super->held_root); - return dm_bm_unlock(sblock); + dm_bm_unlock(sblock); + + return 0; } int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd, @@ -1392,10 +1404,11 @@ int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, dm_block_t keys[2] = { td->id, block }; struct dm_btree_info *info; - if (pmd->fail_io) - return -EINVAL; - down_read(&pmd->root_lock); + if (pmd->fail_io) { + up_read(&pmd->root_lock); + return -EINVAL; + } if (can_issue_io) { info = &pmd->info; @@ -1419,6 +1432,63 @@ int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, return r; } +/* FIXME: write a more efficient one in btree */ +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; + dm_block_t pool_end; + struct dm_thin_lookup_result lookup; + + if (end < begin) + return -ENODATA; + + /* + * Find first mapped block. + */ + while (begin < end) { + r = dm_thin_find_block(td, begin, true, &lookup); + if (r) { + if (r != -ENODATA) + return r; + } else + break; + + begin++; + } + + if (begin == end) + return -ENODATA; + + *thin_begin = begin; + *pool_begin = lookup.block; + *maybe_shared = lookup.shared; + + begin++; + pool_end = *pool_begin + 1; + while (begin != end) { + r = dm_thin_find_block(td, begin, true, &lookup); + 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; +} + static int __insert(struct dm_thin_device *td, dm_block_t block, dm_block_t data_block) { @@ -1471,6 +1541,65 @@ static int __remove(struct dm_thin_device *td, dm_block_t block) return 0; } +static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) +{ + int r; + unsigned count, total_count = 0; + 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; + + /* + * 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; + } + + td->mapped_blocks -= total_count; + 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); +} + int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) { int r = -EINVAL; @@ -1483,6 +1612,19 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) return r; } +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; +} + int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) { int r; @@ -1739,7 +1881,6 @@ int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_cou void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) { down_write(&pmd->root_lock); - pmd->read_only = true; dm_bm_set_read_only(pmd->bm); up_write(&pmd->root_lock); } @@ -1747,7 +1888,6 @@ void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) { down_write(&pmd->root_lock); - pmd->read_only = false; dm_bm_set_read_write(pmd->bm); up_write(&pmd->root_lock); } |