From: Joe Thornber Date: Tue, 24 Jul 2012 23:25:31 +0000 (+1000) Subject: Introduce dm_thin_changed_this_transaction to dm-thin-metadata to publish a X-Git-Tag: next-20120725~49^2~5 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8e74b5039b9d042da4aa82a309166d39ebb007cf;p=karo-tx-linux.git 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 Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- 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);