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| author | Joe Thornber <ejt@redhat.com> | 2012-07-27 15:08:14 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-07-27 15:08:14 +0100 |
| commit | 40db5a537655aa0b17a82a4b5596f8d27400edd8 (patch) | |
| tree | 5e9d59aac1c42d949b47c962d4ee24b4287d23fa | |
| parent | 66b1edc05e3f4c1227f51e40f2ead3e973c00cb0 (diff) | |
| download | linux-40db5a537655aa0b17a82a4b5596f8d27400edd8.tar.gz linux-40db5a537655aa0b17a82a4b5596f8d27400edd8.tar.bz2 linux-40db5a537655aa0b17a82a4b5596f8d27400edd8.zip | |
dm thin metadata: add dm_thin_changed_this_transaction
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>
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 16 | ||||
| -rw-r--r-- | drivers/md/dm-thin-metadata.h | 2 |
2 files changed, 15 insertions, 3 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index 5ae31185e47c..4f5b11c195f4 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -1375,10 +1375,9 @@ static int __insert(struct dm_thin_device *td, dm_block_t block, if (r) return r; - if (inserted) { + td->changed = 1; + if (inserted) td->mapped_blocks++; - td->changed = 1; - } return 0; } @@ -1422,6 +1421,17 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) 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 r; diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index 7e6656c49bd5..1632fec1660d 100644 --- a/drivers/md/dm-thin-metadata.h +++ b/drivers/md/dm-thin-metadata.h @@ -148,6 +148,8 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); /* * Queries. */ +bool dm_thin_changed_this_transaction(struct dm_thin_device *td); + int dm_thin_get_highest_mapped_block(struct dm_thin_device *td, dm_block_t *highest_mapped); |