*/
#include "dm-exception-store.h"
-#include "dm-snap.h"
#include <linux/mm.h>
#include <linux/pagemap.h>
* The top level structure for a persistent exception store.
*/
struct pstore {
- struct dm_snapshot *snap; /* up pointer to my snapshot */
+ struct dm_exception_store *store;
int version;
int valid;
uint32_t exceptions_per_area;
int r = -ENOMEM;
size_t len;
- len = ps->snap->chunk_size << SECTOR_SHIFT;
+ len = ps->store->chunk_size << SECTOR_SHIFT;
/*
* Allocate the chunk_size block of memory that will hold
static void free_area(struct pstore *ps)
{
- vfree(ps->area);
+ if (ps->area)
+ vfree(ps->area);
ps->area = NULL;
- vfree(ps->zero_area);
+
+ if (ps->zero_area)
+ vfree(ps->zero_area);
ps->zero_area = NULL;
}
static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
{
struct dm_io_region where = {
- .bdev = ps->snap->cow->bdev,
- .sector = ps->snap->chunk_size * chunk,
- .count = ps->snap->chunk_size,
+ .bdev = ps->store->cow->bdev,
+ .sector = ps->store->chunk_size * chunk,
+ .count = ps->store->chunk_size,
};
struct dm_io_request io_req = {
.bi_rw = rw,
static void zero_memory_area(struct pstore *ps)
{
- memset(ps->area, 0, ps->snap->chunk_size << SECTOR_SHIFT);
+ memset(ps->area, 0, ps->store->chunk_size << SECTOR_SHIFT);
}
static int zero_disk_area(struct pstore *ps, chunk_t area)
{
struct dm_io_region where = {
- .bdev = ps->snap->cow->bdev,
- .sector = ps->snap->chunk_size * area_location(ps, area),
- .count = ps->snap->chunk_size,
+ .bdev = ps->store->cow->bdev,
+ .sector = ps->store->chunk_size * area_location(ps, area),
+ .count = ps->store->chunk_size,
};
struct dm_io_request io_req = {
.bi_rw = WRITE,
/*
* Use default chunk size (or hardsect_size, if larger) if none supplied
*/
- if (!ps->snap->chunk_size) {
- ps->snap->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
- bdev_hardsect_size(ps->snap->cow->bdev) >> 9);
- ps->snap->chunk_mask = ps->snap->chunk_size - 1;
- ps->snap->chunk_shift = ffs(ps->snap->chunk_size) - 1;
+ if (!ps->store->chunk_size) {
+ ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
+ bdev_hardsect_size(ps->store->cow->bdev) >> 9);
+ ps->store->chunk_mask = ps->store->chunk_size - 1;
+ ps->store->chunk_shift = ffs(ps->store->chunk_size) - 1;
chunk_size_supplied = 0;
}
- ps->io_client = dm_io_client_create(sectors_to_pages(ps->snap->
+ ps->io_client = dm_io_client_create(sectors_to_pages(ps->store->
chunk_size));
if (IS_ERR(ps->io_client))
return PTR_ERR(ps->io_client);
ps->version = le32_to_cpu(dh->version);
chunk_size = le32_to_cpu(dh->chunk_size);
- if (!chunk_size_supplied || ps->snap->chunk_size == chunk_size)
+ if (!chunk_size_supplied || ps->store->chunk_size == chunk_size)
return 0;
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);
+ (unsigned long long)ps->store->chunk_size);
/* We had a bogus chunk_size. Fix stuff up. */
free_area(ps);
- ps->snap->chunk_size = chunk_size;
- ps->snap->chunk_mask = chunk_size - 1;
- ps->snap->chunk_shift = ffs(chunk_size) - 1;
+ ps->store->chunk_size = chunk_size;
+ ps->store->chunk_mask = chunk_size - 1;
+ ps->store->chunk_shift = ffs(chunk_size) - 1;
- r = dm_io_client_resize(sectors_to_pages(ps->snap->chunk_size),
+ r = dm_io_client_resize(sectors_to_pages(ps->store->chunk_size),
ps->io_client);
if (r)
return r;
{
struct disk_header *dh;
- memset(ps->area, 0, ps->snap->chunk_size << SECTOR_SHIFT);
+ memset(ps->area, 0, ps->store->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->snap->chunk_size);
+ dh->chunk_size = cpu_to_le32(ps->store->chunk_size);
return chunk_io(ps, 0, WRITE, 1);
}
static void persistent_fraction_full(struct dm_exception_store *store,
sector_t *numerator, sector_t *denominator)
{
- *numerator = get_info(store)->next_free * store->snap->chunk_size;
- *denominator = get_dev_size(store->snap->cow->bdev);
+ *numerator = get_info(store)->next_free * store->chunk_size;
+ *denominator = get_dev_size(store->cow->bdev);
}
-static void persistent_destroy(struct dm_exception_store *store)
+static void persistent_dtr(struct dm_exception_store *store)
{
struct pstore *ps = get_info(store);
destroy_workqueue(ps->metadata_wq);
- dm_io_client_destroy(ps->io_client);
- vfree(ps->callbacks);
+
+ /* Created in read_header */
+ if (ps->io_client)
+ dm_io_client_destroy(ps->io_client);
free_area(ps);
+
+ /* Allocated in persistent_read_metadata */
+ if (ps->callbacks)
+ vfree(ps->callbacks);
+
kfree(ps);
}
/*
* Now we know correct chunk_size, complete the initialisation.
*/
- ps->exceptions_per_area = (ps->snap->chunk_size << SECTOR_SHIFT) /
+ ps->exceptions_per_area = (ps->store->chunk_size << SECTOR_SHIFT) /
sizeof(struct disk_exception);
ps->callbacks = dm_vcalloc(ps->exceptions_per_area,
sizeof(*ps->callbacks));
struct pstore *ps = get_info(store);
uint32_t stride;
chunk_t next_free;
- sector_t size = get_dev_size(store->snap->cow->bdev);
+ sector_t size = get_dev_size(store->cow->bdev);
/* Is there enough room ? */
- if (size < ((ps->next_free + 1) * store->snap->chunk_size))
+ if (size < ((ps->next_free + 1) * store->chunk_size))
return -ENOSPC;
e->new_chunk = ps->next_free;
DMWARN("write header failed");
}
-int dm_create_persistent(struct dm_exception_store *store)
+static int persistent_ctr(struct dm_exception_store *store,
+ unsigned argc, char **argv)
{
struct pstore *ps;
/* allocate the pstore */
- ps = kmalloc(sizeof(*ps), GFP_KERNEL);
+ ps = kzalloc(sizeof(*ps), GFP_KERNEL);
if (!ps)
return -ENOMEM;
- ps->snap = store->snap;
+ ps->store = store;
ps->valid = 1;
ps->version = SNAPSHOT_DISK_VERSION;
ps->area = NULL;
return -ENOMEM;
}
- store->destroy = persistent_destroy;
- store->read_metadata = persistent_read_metadata;
- store->prepare_exception = persistent_prepare_exception;
- store->commit_exception = persistent_commit_exception;
- store->drop_snapshot = persistent_drop_snapshot;
- store->fraction_full = persistent_fraction_full;
store->context = ps;
return 0;
}
+static unsigned persistent_status(struct dm_exception_store *store,
+ status_type_t status, char *result,
+ unsigned maxlen)
+{
+ unsigned sz = 0;
+
+ switch (status) {
+ case STATUSTYPE_INFO:
+ break;
+ case STATUSTYPE_TABLE:
+ DMEMIT(" %s P %llu", store->cow->name,
+ (unsigned long long)store->chunk_size);
+ }
+
+ return sz;
+}
+
+static struct dm_exception_store_type _persistent_type = {
+ .name = "persistent",
+ .module = THIS_MODULE,
+ .ctr = persistent_ctr,
+ .dtr = persistent_dtr,
+ .read_metadata = persistent_read_metadata,
+ .prepare_exception = persistent_prepare_exception,
+ .commit_exception = persistent_commit_exception,
+ .drop_snapshot = persistent_drop_snapshot,
+ .fraction_full = persistent_fraction_full,
+ .status = persistent_status,
+};
+
+static struct dm_exception_store_type _persistent_compat_type = {
+ .name = "P",
+ .module = THIS_MODULE,
+ .ctr = persistent_ctr,
+ .dtr = persistent_dtr,
+ .read_metadata = persistent_read_metadata,
+ .prepare_exception = persistent_prepare_exception,
+ .commit_exception = persistent_commit_exception,
+ .drop_snapshot = persistent_drop_snapshot,
+ .fraction_full = persistent_fraction_full,
+ .status = persistent_status,
+};
+
int dm_persistent_snapshot_init(void)
{
- return 0;
+ int r;
+
+ r = dm_exception_store_type_register(&_persistent_type);
+ if (r) {
+ DMERR("Unable to register persistent exception store type");
+ return r;
+ }
+
+ r = dm_exception_store_type_register(&_persistent_compat_type);
+ if (r) {
+ DMERR("Unable to register old-style persistent exception "
+ "store type");
+ dm_exception_store_type_unregister(&_persistent_type);
+ return r;
+ }
+
+ return r;
}
void dm_persistent_snapshot_exit(void)
{
+ dm_exception_store_type_unregister(&_persistent_type);
+ dm_exception_store_type_unregister(&_persistent_compat_type);
}
projects / linux-2.6-omap-h63xx.git / blobdiff