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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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6
drivers/md/dm-exception-store.h
View file

@ -86,9 +86,9 @@ struct dm_exception_store_type {
/*
* Return how full the snapshot is.
*/
void (*fraction_full) (struct dm_exception_store *store,
sector_t *numerator,
sector_t *denominator);
void (*usage) (struct dm_exception_store *store,
sector_t *total_sectors, sector_t *sectors_allocated,
sector_t *metadata_sectors);
/* For internal device-mapper use only. */
struct list_head list;

23
drivers/md/dm-snap-persistent.c
View file

@ -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,
};

15
drivers/md/dm-snap-transient.c
View file

@ -59,11 +59,14 @@ static void transient_commit_exception(struct dm_exception_store *store,
callback(callback_context, 1);
}
static void transient_fraction_full(struct dm_exception_store *store,
sector_t *numerator, sector_t *denominator)
static void transient_usage(struct dm_exception_store *store,
sector_t *total_sectors,
sector_t *sectors_allocated,
sector_t *metadata_sectors)
{
*numerator = ((struct transient_c *) store->context)->next_free;
*denominator = get_dev_size(store->cow->bdev);
*sectors_allocated = ((struct transient_c *) store->context)->next_free;
*total_sectors = get_dev_size(store->cow->bdev);
*metadata_sectors = 0;
}
static int transient_ctr(struct dm_exception_store *store,
@ -106,7 +109,7 @@ static struct dm_exception_store_type _transient_type = {
.read_metadata = transient_read_metadata,
.prepare_exception = transient_prepare_exception,
.commit_exception = transient_commit_exception,
.fraction_full = transient_fraction_full,
.usage = transient_usage,
.status = transient_status,
};
@ -118,7 +121,7 @@ static struct dm_exception_store_type _transient_compat_type = {
.read_metadata = transient_read_metadata,
.prepare_exception = transient_prepare_exception,
.commit_exception = transient_commit_exception,
.fraction_full = transient_fraction_full,
.usage = transient_usage,
.status = transient_status,
};

21
drivers/md/dm-snap.c
View file

@ -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,