/*
- * Copyright (C) 2011 Red Hat, Inc.
+ * Copyright (C) 2011-2012 Red Hat, Inc.
*
* This file is released under the GPL.
*/
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
+ * 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;
};
struct dm_thin_device {
dm_thin_id id;
int open_count;
- int changed;
+ bool changed:1;
+ bool aborted_with_changes:1;
uint64_t mapped_blocks;
uint64_t transaction_id;
uint32_t creation_time;
return r;
}
-static int __format_metadata(struct dm_pool_metadata *pmd, dm_block_t nr_blocks)
+static int __format_metadata(struct dm_pool_metadata *pmd)
{
int r;
return r;
}
- pmd->data_sm = dm_sm_disk_create(pmd->tm, nr_blocks);
+ pmd->data_sm = dm_sm_disk_create(pmd->tm, 0);
if (IS_ERR(pmd->data_sm)) {
DMERR("sm_disk_create failed");
r = PTR_ERR(pmd->data_sm);
- goto bad;
+ goto bad_cleanup_tm;
}
pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
if (!pmd->nb_tm) {
- DMERR("could not create clone tm");
+ DMERR("could not create non-blocking clone tm");
r = -ENOMEM;
- goto bad_data_sm;
+ goto bad_cleanup_data_sm;
}
__setup_btree_details(pmd);
- pmd->root = 0;
- pmd->details_root = 0;
- pmd->trans_id = 0;
- pmd->flags = 0;
-
r = dm_btree_empty(&pmd->info, &pmd->root);
if (r < 0)
- goto bad_data_sm;
+ goto bad_cleanup_nb_tm;
r = dm_btree_empty(&pmd->details_info, &pmd->details_root);
if (r < 0) {
DMERR("couldn't create devices root");
- goto bad_data_sm;
+ goto bad_cleanup_nb_tm;
}
r = __write_initial_superblock(pmd);
if (r)
- goto bad_data_sm;
+ goto bad_cleanup_nb_tm;
return 0;
-bad_data_sm:
+bad_cleanup_nb_tm:
+ dm_tm_destroy(pmd->nb_tm);
+bad_cleanup_data_sm:
dm_sm_destroy(pmd->data_sm);
-bad:
+bad_cleanup_tm:
dm_tm_destroy(pmd->tm);
dm_sm_destroy(pmd->metadata_sm);
return r;
}
+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;
+}
+
static int __open_metadata(struct dm_pool_metadata *pmd)
{
int r;
}
disk_super = dm_block_data(sblock);
+
+ r = __check_incompat_features(disk_super, pmd);
+ if (r < 0)
+ goto bad_unlock_sblock;
+
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");
- dm_bm_unlock(sblock);
- return r;
+ goto bad_unlock_sblock;
}
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");
- dm_bm_unlock(sblock);
r = PTR_ERR(pmd->data_sm);
- goto bad;
+ goto bad_cleanup_tm;
}
- dm_bm_unlock(sblock);
-
pmd->nb_tm = dm_tm_create_non_blocking_clone(pmd->tm);
if (!pmd->nb_tm) {
- DMERR("could not create clone tm");
+ DMERR("could not create non-blocking clone tm");
r = -ENOMEM;
- goto bad_data_sm;
+ goto bad_cleanup_data_sm;
}
__setup_btree_details(pmd);
+ return dm_bm_unlock(sblock);
-bad_data_sm:
+bad_cleanup_data_sm:
dm_sm_destroy(pmd->data_sm);
-bad:
+bad_cleanup_tm:
dm_tm_destroy(pmd->tm);
dm_sm_destroy(pmd->metadata_sm);
+bad_unlock_sblock:
+ dm_bm_unlock(sblock);
return r;
}
-static int __open_or_format_metadata(struct dm_pool_metadata *pmd,
- dm_block_t nr_blocks, int create)
+static int __open_or_format_metadata(struct dm_pool_metadata *pmd, bool format_device)
{
- if (create)
- return __format_metadata(pmd, nr_blocks);
- else
- return __open_metadata(pmd);
+ int r, unformatted;
+
+ r = __superblock_all_zeroes(pmd->bm, &unformatted);
+ if (r)
+ return r;
+
+ if (unformatted)
+ return format_device ? __format_metadata(pmd) : -EPERM;
+
+ return __open_metadata(pmd);
}
-static int __create_persistent_data_objects(struct dm_pool_metadata *pmd,
- dm_block_t nr_blocks, int *create)
+static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool format_device)
{
int r;
return PTR_ERR(pmd->bm);
}
- r = __superblock_all_zeroes(pmd->bm, create);
- if (r) {
- dm_block_manager_destroy(pmd->bm);
- return r;
- }
-
- r = __open_or_format_metadata(pmd, nr_blocks, *create);
+ r = __open_or_format_metadata(pmd, format_device);
if (r)
dm_block_manager_destroy(pmd->bm);
static int __begin_transaction(struct dm_pool_metadata *pmd)
{
int r;
- u32 features;
struct thin_disk_superblock *disk_super;
struct dm_block *sblock;
pmd->flags = le32_to_cpu(disk_super->flags);
pmd->data_block_size = le32_to_cpu(disk_super->data_block_size);
- 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);
- r = -EINVAL;
- goto out;
- }
-
- /*
- * Check for read-only metadata to skip the following RDWR checks.
- */
- if (get_disk_ro(pmd->bdev->bd_disk))
- goto out;
-
- 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);
- r = -EINVAL;
- }
-
-out:
dm_bm_unlock(sblock);
- return r;
+ return 0;
}
static int __write_changed_details(struct dm_pool_metadata *pmd)
static int __commit_transaction(struct dm_pool_metadata *pmd)
{
- /*
- * FIXME: Associated pool should be made read-only on failure.
- */
int r;
size_t metadata_len, data_len;
struct thin_disk_superblock *disk_super;
}
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 r;
struct dm_pool_metadata *pmd;
- int create;
pmd = kmalloc(sizeof(*pmd), GFP_KERNEL);
if (!pmd) {
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;
- r = __create_persistent_data_objects(pmd, 0, &create);
+ r = __create_persistent_data_objects(pmd, format_device);
if (r) {
kfree(pmd);
return ERR_PTR(r);
return -EBUSY;
}
- r = __commit_transaction(pmd);
- if (r < 0)
- DMWARN("%s: __commit_transaction() failed, error = %d",
- __func__, r);
+ if (!pmd->read_only && !pmd->fail_io) {
+ r = __commit_transaction(pmd);
+ if (r < 0)
+ DMWARN("%s: __commit_transaction() failed, error = %d",
+ __func__, r);
+ }
- __destroy_persistent_data_objects(pmd);
- kfree(pmd);
+ if (!pmd->fail_io)
+ __destroy_persistent_data_objects(pmd);
+ kfree(pmd);
return 0;
}
(*td)->id = dev;
(*td)->open_count = 1;
(*td)->changed = changed;
+ (*td)->aborted_with_changes = false;
(*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);
int dm_pool_create_thin(struct dm_pool_metadata *pmd, dm_thin_id dev)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __create_thin(pmd, dev);
+ if (!pmd->fail_io)
+ r = __create_thin(pmd, dev);
up_write(&pmd->root_lock);
return r;
dm_thin_id dev,
dm_thin_id origin)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __create_snap(pmd, dev, origin);
+ if (!pmd->fail_io)
+ r = __create_snap(pmd, dev, origin);
up_write(&pmd->root_lock);
return r;
int dm_pool_delete_thin_device(struct dm_pool_metadata *pmd,
dm_thin_id dev)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __delete_device(pmd, dev);
+ if (!pmd->fail_io)
+ r = __delete_device(pmd, dev);
up_write(&pmd->root_lock);
return r;
uint64_t current_id,
uint64_t new_id)
{
+ int r = -EINVAL;
+
down_write(&pmd->root_lock);
+
+ if (pmd->fail_io)
+ goto out;
+
if (pmd->trans_id != current_id) {
- up_write(&pmd->root_lock);
DMERR("mismatched transaction id");
- return -EINVAL;
+ goto out;
}
pmd->trans_id = new_id;
+ r = 0;
+
+out:
up_write(&pmd->root_lock);
- return 0;
+ return r;
}
int dm_pool_get_metadata_transaction_id(struct dm_pool_metadata *pmd,
uint64_t *result)
{
+ int r = -EINVAL;
+
down_read(&pmd->root_lock);
- *result = pmd->trans_id;
+ if (!pmd->fail_io) {
+ *result = pmd->trans_id;
+ r = 0;
+ }
up_read(&pmd->root_lock);
- return 0;
+ return r;
}
static int __reserve_metadata_snap(struct dm_pool_metadata *pmd)
int dm_pool_reserve_metadata_snap(struct dm_pool_metadata *pmd)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __reserve_metadata_snap(pmd);
+ if (!pmd->fail_io)
+ r = __reserve_metadata_snap(pmd);
up_write(&pmd->root_lock);
return r;
int dm_pool_release_metadata_snap(struct dm_pool_metadata *pmd)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __release_metadata_snap(pmd);
+ if (!pmd->fail_io)
+ r = __release_metadata_snap(pmd);
up_write(&pmd->root_lock);
return r;
int dm_pool_get_metadata_snap(struct dm_pool_metadata *pmd,
dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
down_read(&pmd->root_lock);
- r = __get_metadata_snap(pmd, result);
+ if (!pmd->fail_io)
+ r = __get_metadata_snap(pmd, result);
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)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __open_device(pmd, dev, 0, td);
+ if (!pmd->fail_io)
+ r = __open_device(pmd, dev, 0, td);
up_write(&pmd->root_lock);
return r;
int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block,
int can_block, struct dm_thin_lookup_result *result)
{
- int r;
+ int r = -EINVAL;
uint64_t block_time = 0;
__le64 value;
struct dm_pool_metadata *pmd = td->pmd;
dm_block_t keys[2] = { td->id, block };
+ struct dm_btree_info *info;
if (can_block) {
down_read(&pmd->root_lock);
- r = dm_btree_lookup(&pmd->info, pmd->root, keys, &value);
- if (!r)
- block_time = le64_to_cpu(value);
- up_read(&pmd->root_lock);
-
- } else if (down_read_trylock(&pmd->root_lock)) {
- r = dm_btree_lookup(&pmd->nb_info, pmd->root, keys, &value);
- if (!r)
- block_time = le64_to_cpu(value);
- up_read(&pmd->root_lock);
-
- } else
+ info = &pmd->info;
+ } else if (down_read_trylock(&pmd->root_lock))
+ info = &pmd->nb_info;
+ else
return -EWOULDBLOCK;
+ if (pmd->fail_io)
+ goto out;
+
+ r = dm_btree_lookup(info, pmd->root, keys, &value);
+ if (!r)
+ block_time = le64_to_cpu(value);
+
+out:
+ up_read(&pmd->root_lock);
+
if (!r) {
dm_block_t exception_block;
uint32_t exception_time;
if (r)
return r;
- if (inserted) {
+ td->changed = 1;
+ if (inserted)
td->mapped_blocks++;
- td->changed = 1;
- }
return 0;
}
int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block,
dm_block_t data_block)
{
- int r;
+ int r = -EINVAL;
down_write(&td->pmd->root_lock);
- r = __insert(td, block, data_block);
+ if (!td->pmd->fail_io)
+ r = __insert(td, block, data_block);
up_write(&td->pmd->root_lock);
return r;
int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)
{
- int r;
+ int r = -EINVAL;
down_write(&td->pmd->root_lock);
- r = __remove(td, block);
+ if (!td->pmd->fail_io)
+ r = __remove(td, block);
up_write(&td->pmd->root_lock);
return r;
}
-int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
+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;
+}
+
+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;
+}
+
+int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
+{
+ int r = -EINVAL;
+
down_write(&pmd->root_lock);
- r = dm_sm_new_block(pmd->data_sm, result);
+ if (!pmd->fail_io)
+ r = dm_sm_new_block(pmd->data_sm, result);
up_write(&pmd->root_lock);
return r;
int dm_pool_commit_metadata(struct dm_pool_metadata *pmd)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
+ if (pmd->fail_io)
+ goto out;
r = __commit_transaction(pmd);
if (r <= 0)
return r;
}
+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;
+}
+
int dm_pool_get_free_block_count(struct dm_pool_metadata *pmd, dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
down_read(&pmd->root_lock);
- r = dm_sm_get_nr_free(pmd->data_sm, result);
+ if (!pmd->fail_io)
+ r = dm_sm_get_nr_free(pmd->data_sm, result);
up_read(&pmd->root_lock);
return r;
int dm_pool_get_free_metadata_block_count(struct dm_pool_metadata *pmd,
dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
down_read(&pmd->root_lock);
- r = dm_sm_get_nr_free(pmd->metadata_sm, result);
+ if (!pmd->fail_io)
+ r = dm_sm_get_nr_free(pmd->metadata_sm, result);
up_read(&pmd->root_lock);
return r;
int dm_pool_get_metadata_dev_size(struct dm_pool_metadata *pmd,
dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
down_read(&pmd->root_lock);
- r = dm_sm_get_nr_blocks(pmd->metadata_sm, result);
+ if (!pmd->fail_io)
+ r = dm_sm_get_nr_blocks(pmd->metadata_sm, result);
up_read(&pmd->root_lock);
return r;
int dm_pool_get_data_dev_size(struct dm_pool_metadata *pmd, dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
down_read(&pmd->root_lock);
- r = dm_sm_get_nr_blocks(pmd->data_sm, result);
+ if (!pmd->fail_io)
+ r = dm_sm_get_nr_blocks(pmd->data_sm, result);
up_read(&pmd->root_lock);
return r;
int dm_thin_get_mapped_count(struct dm_thin_device *td, dm_block_t *result)
{
+ int r = -EINVAL;
struct dm_pool_metadata *pmd = td->pmd;
down_read(&pmd->root_lock);
- *result = td->mapped_blocks;
+ if (!pmd->fail_io) {
+ *result = td->mapped_blocks;
+ r = 0;
+ }
up_read(&pmd->root_lock);
- return 0;
+ return r;
}
static int __highest_block(struct dm_thin_device *td, dm_block_t *result)
int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
dm_block_t *result)
{
- int r;
+ int r = -EINVAL;
struct dm_pool_metadata *pmd = td->pmd;
down_read(&pmd->root_lock);
- r = __highest_block(td, result);
+ if (!pmd->fail_io)
+ r = __highest_block(td, result);
up_read(&pmd->root_lock);
return r;
int dm_pool_resize_data_dev(struct dm_pool_metadata *pmd, dm_block_t new_count)
{
- int r;
+ int r = -EINVAL;
down_write(&pmd->root_lock);
- r = __resize_data_dev(pmd, new_count);
+ if (!pmd->fail_io)
+ r = __resize_data_dev(pmd, new_count);
up_write(&pmd->root_lock);
return r;
}
+
+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);
+}
projects / deliverable / linux.git / blobdiff