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dm snapshot: remove dm_snap header use

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Move useful functions out of dm-snap.h and stop using dm-snap.h.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2009-04-02 19:55:33 +01:00
committed by Alasdair G Kergon
parent 49beb2b87a
commit 71fab00a6b
5 changed files with 54 additions and 57 deletions
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56
drivers/md/dm-snap-persistent.c
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@@ -6,7 +6,6 @@
*/
#include "dm-exception-store.h"
#include "dm-snap.h"
#include <linux/mm.h>
#include <linux/pagemap.h>
@@ -89,7 +88,7 @@ struct commit_callback {
* 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;
@@ -141,7 +140,7 @@ static int alloc_area(struct pstore *ps)
int r = -ENOMEM;
size_t len;
len = ps->snap->store->chunk_size << SECTOR_SHIFT;
len = ps->store->chunk_size << SECTOR_SHIFT;
/*
* Allocate the chunk_size block of memory that will hold
@@ -189,9 +188,9 @@ static void do_metadata(struct work_struct *work)
static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
{
struct dm_io_region where = {
.bdev = ps->snap->store->cow->bdev,
.sector = ps->snap->store->chunk_size * chunk,
.count = ps->snap->store->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,
@@ -247,15 +246,15 @@ static int area_io(struct pstore *ps, int rw)
static void zero_memory_area(struct pstore *ps)
{
memset(ps->area, 0, ps->snap->store->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->store->cow->bdev,
.sector = ps->snap->store->chunk_size * area_location(ps, area),
.count = ps->snap->store->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,
@@ -278,17 +277,16 @@ static int read_header(struct pstore *ps, int *new_snapshot)
/*
* Use default chunk size (or hardsect_size, if larger) if none supplied
*/
if (!ps->snap->store->chunk_size) {
ps->snap->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
bdev_hardsect_size(ps->snap->store->cow->bdev) >> 9);
ps->snap->store->chunk_mask = ps->snap->store->chunk_size - 1;
ps->snap->store->chunk_shift = ffs(ps->snap->store->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->
store->chunk_size));
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);
@@ -318,22 +316,22 @@ static int read_header(struct pstore *ps, int *new_snapshot)
ps->version = le32_to_cpu(dh->version);
chunk_size = le32_to_cpu(dh->chunk_size);
if (!chunk_size_supplied || ps->snap->store->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->store->chunk_size);
(unsigned long long)ps->store->chunk_size);
/* We had a bogus chunk_size. Fix stuff up. */
free_area(ps);
ps->snap->store->chunk_size = chunk_size;
ps->snap->store->chunk_mask = chunk_size - 1;
ps->snap->store->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->store->chunk_size),
r = dm_io_client_resize(sectors_to_pages(ps->store->chunk_size),
ps->io_client);
if (r)
return r;
@@ -350,13 +348,13 @@ static int write_header(struct pstore *ps)
{
struct disk_header *dh;
memset(ps->area, 0, ps->snap->store->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->store->chunk_size);
dh->chunk_size = cpu_to_le32(ps->store->chunk_size);
return chunk_io(ps, 0, WRITE, 1);
}
@@ -508,8 +506,8 @@ static int persistent_read_metadata(struct dm_exception_store *store,
/*
* Now we know correct chunk_size, complete the initialisation.
*/
ps->exceptions_per_area = (ps->snap->store->chunk_size << SECTOR_SHIFT)
/ sizeof(struct disk_exception);
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));
if (!ps->callbacks)
@@ -667,7 +665,7 @@ static int persistent_ctr(struct dm_exception_store *store,
if (!ps)
return -ENOMEM;
ps->snap = store->snap;
ps->store = store;
ps->valid = 1;
ps->version = SNAPSHOT_DISK_VERSION;
ps->area = NULL;