From 985903bb3a6d98623360ab6c855417f638840029 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Thu, 10 Dec 2009 23:52:11 +0000 Subject: dm snapshot: add allocated metadata to snapshot status Add number of sectors used by metadata to the end of the snapshot's status line. Renamed dm_exception_store_type's 'fraction_full' to 'usage'. Renamed arguments to be clearer about what is being returned. Also added 'metadata_sectors'. Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/dm-snap-persistent.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) (limited to 'drivers/md/dm-snap-persistent.c') diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 24b8acd..767065f 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -489,11 +489,22 @@ static struct pstore *get_info(struct dm_exception_store *store) return (struct pstore *) store->context; } -static void persistent_fraction_full(struct dm_exception_store *store, - sector_t *numerator, sector_t *denominator) +static void persistent_usage(struct dm_exception_store *store, + sector_t *total_sectors, + sector_t *sectors_allocated, + sector_t *metadata_sectors) { - *numerator = get_info(store)->next_free * store->chunk_size; - *denominator = get_dev_size(store->cow->bdev); + struct pstore *ps = get_info(store); + + *sectors_allocated = ps->next_free * store->chunk_size; + *total_sectors = get_dev_size(store->cow->bdev); + + /* + * First chunk is the fixed header. + * Then there are (ps->current_area + 1) metadata chunks, each one + * separated from the next by ps->exceptions_per_area data chunks. + */ + *metadata_sectors = (ps->current_area + 2) * store->chunk_size; } static void persistent_dtr(struct dm_exception_store *store) @@ -738,7 +749,7 @@ static struct dm_exception_store_type _persistent_type = { .prepare_exception = persistent_prepare_exception, .commit_exception = persistent_commit_exception, .drop_snapshot = persistent_drop_snapshot, - .fraction_full = persistent_fraction_full, + .usage = persistent_usage, .status = persistent_status, }; @@ -751,7 +762,7 @@ static struct dm_exception_store_type _persistent_compat_type = { .prepare_exception = persistent_prepare_exception, .commit_exception = persistent_commit_exception, .drop_snapshot = persistent_drop_snapshot, - .fraction_full = persistent_fraction_full, + .usage = persistent_usage, .status = persistent_status, }; -- cgit v1.1