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authorMike Snitzer <snitzer@redhat.com>2009-12-10 23:52:11 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-12-10 23:52:11 +0000
commit985903bb3a6d98623360ab6c855417f638840029 (patch)
tree64e7582e0b7827aa318c4fe1c497ebc541d9ce8b /drivers/md/dm-snap-persistent.c
parent3510cb94ff7b04b016bd22bfee913e2c1c05c066 (diff)
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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 <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-snap-persistent.c')
-rw-r--r--drivers/md/dm-snap-persistent.c23
1 files changed, 17 insertions, 6 deletions
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,
};