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[PATCH] dm snapshot: unify chunk_size
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Persistent snapshots currently store a private copy of the chunk size.
Userspace also supplies the chunk size when loading a snapshot.  Ensure
consistency by only storing the chunk_size in one place instead of two.

Currently the two sizes will differ if the chunk size supplied by userspace
does not match the chunk size an existing snapshot actually uses.  Amongst
other problems, this causes an incorrect 'percentage full' to be reported.

The patch ensures consistency by only storing the chunk_size in one place,
removing it from struct pstore.  Some initialisation is delayed until the
correct chunk_size is known.  If read_header() discovers that the wrong chunk
size was supplied, the 'area' buffer (which the header already got read into)
is reinitialised to the correct size.

[akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled]

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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kergon authored and Linus Torvalds committed Jun 26, 2006
1 parent b877a96 commit c51c275
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Showing 2 changed files with 45 additions and 26 deletions.
65 changes: 42 additions & 23 deletions drivers/md/dm-exception-store.c
Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,6 @@ struct pstore {
struct dm_snapshot *snap; /* up pointer to my snapshot */
int version;
int valid;
uint32_t chunk_size;
uint32_t exceptions_per_area;

/*
Expand Down Expand Up @@ -133,7 +132,7 @@ static int alloc_area(struct pstore *ps)
int r = -ENOMEM;
size_t len;

len = ps->chunk_size << SECTOR_SHIFT;
len = ps->snap->chunk_size << SECTOR_SHIFT;

/*
* Allocate the chunk_size block of memory that will hold
Expand All @@ -160,8 +159,8 @@ static int chunk_io(struct pstore *ps, uint32_t chunk, int rw)
unsigned long bits;

where.bdev = ps->snap->cow->bdev;
where.sector = ps->chunk_size * chunk;
where.count = ps->chunk_size;
where.sector = ps->snap->chunk_size * chunk;
where.count = ps->snap->chunk_size;

return dm_io_sync_vm(1, &where, rw, ps->area, &bits);
}
Expand All @@ -188,14 +187,15 @@ static int area_io(struct pstore *ps, uint32_t area, int rw)

static int zero_area(struct pstore *ps, uint32_t area)
{
memset(ps->area, 0, ps->chunk_size << SECTOR_SHIFT);
memset(ps->area, 0, ps->snap->chunk_size << SECTOR_SHIFT);
return area_io(ps, area, WRITE);
}

static int read_header(struct pstore *ps, int *new_snapshot)
{
int r;
struct disk_header *dh;
chunk_t chunk_size;

r = chunk_io(ps, 0, READ);
if (r)
Expand All @@ -210,8 +210,29 @@ static int read_header(struct pstore *ps, int *new_snapshot)
*new_snapshot = 0;
ps->valid = le32_to_cpu(dh->valid);
ps->version = le32_to_cpu(dh->version);
ps->chunk_size = le32_to_cpu(dh->chunk_size);

chunk_size = le32_to_cpu(dh->chunk_size);
if (ps->snap->chunk_size != chunk_size) {
DMWARN("chunk size %llu in device metadata overrides "
"table chunk size of %llu.",
(unsigned long long)chunk_size,
(unsigned long long)ps->snap->chunk_size);

/* We had a bogus chunk_size. Fix stuff up. */
dm_io_put(sectors_to_pages(ps->snap->chunk_size));
free_area(ps);

ps->snap->chunk_size = chunk_size;
ps->snap->chunk_mask = chunk_size - 1;
ps->snap->chunk_shift = ffs(chunk_size) - 1;

r = alloc_area(ps);
if (r)
return r;

r = dm_io_get(sectors_to_pages(chunk_size));
if (r)
return r;
}
} else {
DMWARN("Invalid/corrupt snapshot");
r = -ENXIO;
Expand All @@ -224,13 +245,13 @@ static int write_header(struct pstore *ps)
{
struct disk_header *dh;

memset(ps->area, 0, ps->chunk_size << SECTOR_SHIFT);
memset(ps->area, 0, ps->snap->chunk_size << SECTOR_SHIFT);

dh = (struct disk_header *) ps->area;
dh->magic = cpu_to_le32(SNAP_MAGIC);
dh->valid = cpu_to_le32(ps->valid);
dh->version = cpu_to_le32(ps->version);
dh->chunk_size = cpu_to_le32(ps->chunk_size);
dh->chunk_size = cpu_to_le32(ps->snap->chunk_size);

return chunk_io(ps, 0, WRITE);
}
Expand Down Expand Up @@ -365,7 +386,7 @@ static void persistent_destroy(struct exception_store *store)
{
struct pstore *ps = get_info(store);

dm_io_put(sectors_to_pages(ps->chunk_size));
dm_io_put(sectors_to_pages(ps->snap->chunk_size));
vfree(ps->callbacks);
free_area(ps);
kfree(ps);
Expand All @@ -383,6 +404,16 @@ static int persistent_read_metadata(struct exception_store *store)
if (r)
return r;

/*
* Now we know correct chunk_size, complete the initialisation.
*/
ps->exceptions_per_area = (ps->snap->chunk_size << SECTOR_SHIFT) /
sizeof(struct disk_exception);
ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
sizeof(*ps->callbacks));
if (!ps->callbacks)
return -ENOMEM;

/*
* Do we need to setup a new snapshot ?
*/
Expand Down Expand Up @@ -533,28 +564,16 @@ int dm_create_persistent(struct exception_store *store, uint32_t chunk_size)
ps->snap = store->snap;
ps->valid = 1;
ps->version = SNAPSHOT_DISK_VERSION;
ps->chunk_size = chunk_size;
ps->exceptions_per_area = (chunk_size << SECTOR_SHIFT) /
sizeof(struct disk_exception);
ps->next_free = 2; /* skipping the header and first area */
ps->current_committed = 0;

r = alloc_area(ps);
if (r)
goto bad;

/*
* Allocate space for all the callbacks.
*/
ps->callback_count = 0;
atomic_set(&ps->pending_count, 0);
ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
sizeof(*ps->callbacks));

if (!ps->callbacks) {
r = -ENOMEM;
goto bad;
}
ps->callbacks = NULL;

store->destroy = persistent_destroy;
store->read_metadata = persistent_read_metadata;
Expand Down
6 changes: 3 additions & 3 deletions drivers/md/dm-snap.c
Original file line number Diff line number Diff line change
Expand Up @@ -530,7 +530,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}

ti->private = s;
ti->split_io = chunk_size;
ti->split_io = s->chunk_size;

return 0;

Expand Down Expand Up @@ -1204,7 +1204,7 @@ static int origin_status(struct dm_target *ti, status_type_t type, char *result,

static struct target_type origin_target = {
.name = "snapshot-origin",
.version = {1, 1, 0},
.version = {1, 4, 0},
.module = THIS_MODULE,
.ctr = origin_ctr,
.dtr = origin_dtr,
Expand All @@ -1215,7 +1215,7 @@ static struct target_type origin_target = {

static struct target_type snapshot_target = {
.name = "snapshot",
.version = {1, 1, 0},
.version = {1, 4, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,
Expand Down

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