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dm snapshot: refactor zero_disk_area to use chunk_io

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Refactor chunk_io to prepare for the fix in the following patch.

Pass an area pointer to chunk_io and simplify zero_disk_area to use
chunk_io.  No functional change.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-09-04 20:40:37 +01:00 committed by Alasdair G Kergon
parent 7ec23d5094
commit 02d2fd31de
1 changed files with 7 additions and 19 deletions
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26
drivers/md/dm-snap-persistent.c
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@ -188,7 +188,8 @@ static void do_metadata(struct work_struct *work)
/*
* Read or write a chunk aligned and sized block of data from a device.
*/
static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int rw,
int metadata)
{
struct dm_io_region where = {
.bdev = ps->store->cow->bdev,
@ -198,7 +199,7 @@ static int chunk_io(struct pstore *ps, chunk_t chunk, int rw, int metadata)
struct dm_io_request io_req = {
.bi_rw = rw,
.mem.type = DM_IO_VMA,
.mem.ptr.vma = ps->area,
.mem.ptr.vma = area,
.client = ps->io_client,
.notify.fn = NULL,
};
@ -240,7 +241,7 @@ static int area_io(struct pstore *ps, int rw)
chunk = area_location(ps, ps->current_area);
r = chunk_io(ps, chunk, rw, 0);
r = chunk_io(ps, ps->area, chunk, rw, 0);
if (r)
return r;
@ -254,20 +255,7 @@ static void zero_memory_area(struct pstore *ps)
static int zero_disk_area(struct pstore *ps, chunk_t area)
{
struct dm_io_region where = {
.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,
.mem.type = DM_IO_VMA,
.mem.ptr.vma = ps->zero_area,
.client = ps->io_client,
.notify.fn = NULL,
};
return dm_io(&io_req, 1, &where, NULL);
return chunk_io(ps, ps->zero_area, area_location(ps, area), WRITE, 0);
}
static int read_header(struct pstore *ps, int *new_snapshot)
@ -297,7 +285,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
if (r)
return r;
r = chunk_io(ps, 0, READ, 1);
r = chunk_io(ps, ps->area, 0, READ, 1);
if (r)
goto bad;
@ -359,7 +347,7 @@ static int write_header(struct pstore *ps)
dh->version = cpu_to_le32(ps->version);
dh->chunk_size = cpu_to_le32(ps->store->chunk_size);
return chunk_io(ps, 0, WRITE, 1);
return chunk_io(ps, ps->area, 0, WRITE, 1);
}
/*