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dm thin metadata: Add support for a pre-commit callback
commit ecda7c0280
upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
a802c5c9f4
commit
d2688d36ce
2 changed files with 36 additions and 0 deletions
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@ -188,6 +188,15 @@ struct dm_pool_metadata {
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unsigned long flags;
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sector_t data_block_size;
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/*
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* Pre-commit callback.
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*
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* This allows the thin provisioning target to run a callback before
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* the metadata are committed.
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*/
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dm_pool_pre_commit_fn pre_commit_fn;
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void *pre_commit_context;
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/*
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* We reserve a section of the metadata for commit overhead.
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* All reported space does *not* include this.
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@ -826,6 +835,14 @@ static int __commit_transaction(struct dm_pool_metadata *pmd)
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if (unlikely(!pmd->in_service))
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return 0;
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if (pmd->pre_commit_fn) {
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r = pmd->pre_commit_fn(pmd->pre_commit_context);
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if (r < 0) {
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DMERR("pre-commit callback failed");
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return r;
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}
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}
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r = __write_changed_details(pmd);
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if (r < 0)
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return r;
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@ -892,6 +909,8 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,
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pmd->in_service = false;
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pmd->bdev = bdev;
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pmd->data_block_size = data_block_size;
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pmd->pre_commit_fn = NULL;
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pmd->pre_commit_context = NULL;
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r = __create_persistent_data_objects(pmd, format_device);
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if (r) {
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@ -2044,6 +2063,16 @@ int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
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return r;
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}
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void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd,
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dm_pool_pre_commit_fn fn,
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void *context)
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{
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pmd_write_lock_in_core(pmd);
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pmd->pre_commit_fn = fn;
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pmd->pre_commit_context = context;
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pmd_write_unlock(pmd);
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}
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int dm_pool_metadata_set_needs_check(struct dm_pool_metadata *pmd)
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{
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int r = -EINVAL;
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@ -230,6 +230,13 @@ bool dm_pool_metadata_needs_check(struct dm_pool_metadata *pmd);
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*/
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void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd);
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/* Pre-commit callback */
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typedef int (*dm_pool_pre_commit_fn)(void *context);
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void dm_pool_register_pre_commit_callback(struct dm_pool_metadata *pmd,
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dm_pool_pre_commit_fn fn,
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void *context);
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/*----------------------------------------------------------------*/
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#endif
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