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dm thin metadata: Add support for a pre-commit callback 

Add support for one pre-commit callback which is run right before the
metadata are committed.

This allows the thin provisioning target to run a callback before the
metadata are committed and is required by the next commit.

Cc: stable@vger.kernel.org
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Nikos Tsironis 2019-12-04 16:07:41 +02:00 committed by Mike Snitzer
parent 8b3fd1f53a
commit ecda7c0280
2 changed files with 36 additions and 0 deletions
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29
drivers/md/dm-thin-metadata.c
View File

@ -188,6 +188,15 @@ struct dm_pool_metadata {
unsigned long flags;
sector_t data_block_size;
/*
* Pre-commit callback.
*
* This allows the thin provisioning target to run a callback before
* the metadata are committed.
*/
dm_pool_pre_commit_fn pre_commit_fn;
void *pre_commit_context;
/*
* We reserve a section of the metadata for commit overhead.
* All reported space does *not* include this.
@ -826,6 +835,14 @@ static int __commit_transaction(struct dm_pool_metadata *pmd)
if (unlikely(!pmd->in_service))
return 0;
if (pmd->pre_commit_fn) {
r = pmd->pre_commit_fn(pmd->pre_commit_context);
if (r < 0) {
DMERR("pre-commit callback failed");
return r;
}
}
r = __write_changed_details(pmd);
if (r < 0)
return r;
@ -892,6 +909,8 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
pmd->in_service = false;
pmd->bdev = bdev;
pmd->data_block_size = data_block_size;
pmd->pre_commit_fn = NULL;
pmd->pre_commit_context = NULL;
r = __create_persistent_data_objects(pmd, format_device);
if (r) {
@ -2044,6 +2063,16 @@ int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
return r;
}
void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd,
dm_pool_pre_commit_fn fn,
void *context)
{
pmd_write_lock_in_core(pmd);
pmd->pre_commit_fn = fn;
pmd->pre_commit_context = context;
pmd_write_unlock(pmd);
}
int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
{
int r = -EINVAL;

7
drivers/md/dm-thin-metadata.h
View File

@ -230,6 +230,13 @@ bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd);
*/
void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd);
/* Pre-commit callback */
typedef int (*dm_pool_pre_commit_fn)(void *context);
void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd,
dm_pool_pre_commit_fn fn,
void *context);
/*----------------------------------------------------------------*/
#endif