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dm snapshot: add allocated metadata to snapshot status

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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>
This commit is contained in:
Mike Snitzer
2009-12-10 23:52:11 +00:00
committed by Alasdair G Kergon
parent 3510cb94ff
commit 985903bb3a
4 changed files with 41 additions and 24 deletions
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drivers/md/dm-snap.c
+12 -9
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@@ -1174,14 +1174,17 @@ static int snapshot_status(struct dm_target *ti, status_type_t type,
if (!snap->valid)
DMEMIT("Invalid");
else {
if (snap->store->type->fraction_full) {
sector_t numerator, denominator;
snap->store->type->fraction_full(snap->store,
&numerator,
&denominator);
DMEMIT("%llu/%llu",
(unsigned long long)numerator,
(unsigned long long)denominator);
if (snap->store->type->usage) {
sector_t total_sectors, sectors_allocated,
metadata_sectors;
snap->store->type->usage(snap->store,
&total_sectors,
&sectors_allocated,
&metadata_sectors);
DMEMIT("%llu/%llu %llu",
(unsigned long long)sectors_allocated,
(unsigned long long)total_sectors,
(unsigned long long)metadata_sectors);
}
else
DMEMIT("Unknown");
@@ -1462,7 +1465,7 @@ static struct target_type origin_target = {
static struct target_type snapshot_target = {
.name = "snapshot",
.version = {1, 7, 0},
.version = {1, 8, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,