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dm thin metadata: add dm_thin_changed_this_transaction

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Introduce dm_thin_changed_this_transaction to dm-thin-metadata to publish a
useful bit of information we're already tracking.  This will help dm thin
decide when to commit.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber 2012-07-27 15:08:14 +01:00 • committed by Alasdair G Kergon
parent 66b1edc05e
commit 40db5a5376
2 changed files with 15 additions and 3 deletions
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16
drivers/md/dm-thin-metadata.c
View file

@ -1375,10 +1375,9 @@ static int __insert(struct dm_thin_device *td, dm_block_t block,
if (r) if (r)
return r; return r;
if (inserted) {
td->mapped_blocks++;
td->changed = 1; td->changed = 1;
} if (inserted)
td->mapped_blocks++;
return 0; return 0;
} }
@ -1422,6 +1421,17 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block)
return r; return r;
} }
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;
}
int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result) int dm_pool_alloc_data_block(struct dm_pool_metadata *pmd, dm_block_t *result)
{ {
int r; int r;

2
drivers/md/dm-thin-metadata.h
View file

@ -148,6 +148,8 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block);
/* /*
* Queries. * Queries.
*/ */
bool dm_thin_changed_this_transaction(struct dm_thin_device *td);
int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, int dm_thin_get_highest_mapped_block(struct dm_thin_device *td,
dm_block_t *highest_mapped); dm_block_t *highest_mapped);