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dm snapshot: prepare for switch to using dm-bufio 

Change the functions get_exception, read_exception and insert_exceptions
so that ps->area is passed as an argument.

This patch doesn't change any functionality, but it refactors the code
to allow for a cleaner switch over to using dm-bufio.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2014-01-13 19:14:04 -05:00 committed by Mike Snitzer
parent 119bc54736
commit 2cadabd512
1 changed files with 14 additions and 12 deletions
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26
drivers/md/dm-snap-persistent.c
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@ -402,17 +402,18 @@ static int write_header(struct pstore *ps)
/*
* Access functions for the disk exceptions, these do the endian conversions.
*/
static struct disk_exception *get_exception(struct pstore *ps, uint32_t index)
static struct disk_exception *get_exception(struct pstore *ps, void *ps_area,
uint32_t index)
{
BUG_ON(index >= ps->exceptions_per_area);
return ((struct disk_exception *) ps->area) + index;
return ((struct disk_exception *) ps_area) + index;
}
static void read_exception(struct pstore *ps,
static void read_exception(struct pstore *ps, void *ps_area,
uint32_t index, struct core_exception *result)
{
struct disk_exception *de = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, ps_area, index);
/* copy it */
result->old_chunk = le64_to_cpu(de->old_chunk);
@ -422,7 +423,7 @@ static void read_exception(struct pstore *ps,
static void write_exception(struct pstore *ps,
uint32_t index, struct core_exception *e)
{
struct disk_exception *de = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, ps->area, index);
/* copy it */
de->old_chunk = cpu_to_le64(e->old_chunk);
@ -431,7 +432,7 @@ static void write_exception(struct pstore *ps,
static void clear_exception(struct pstore *ps, uint32_t index)
{
struct disk_exception *de = get_exception(ps, index);
struct disk_exception *de = get_exception(ps, ps->area, index);
/* clear it */
de->old_chunk = 0;
@ -443,7 +444,7 @@ static void clear_exception(struct pstore *ps, uint32_t index)
* 'full' is filled in to indicate if the area has been
* filled.
*/
static int insert_exceptions(struct pstore *ps,
static int insert_exceptions(struct pstore *ps, void *ps_area,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context,
@ -457,7 +458,7 @@ static int insert_exceptions(struct pstore *ps,
*full = 1;
for (i = 0; i < ps->exceptions_per_area; i++) {
read_exception(ps, i, &e);
read_exception(ps, ps_area, i, &e);
/*
* If the new_chunk is pointing at the start of
@ -504,7 +505,8 @@ static int read_exceptions(struct pstore *ps,
if (r)
return r;
r = insert_exceptions(ps, callback, callback_context, &full);
r = insert_exceptions(ps, ps->area, callback, callback_context,
&full);
if (r)
return r;
}
@ -734,7 +736,7 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
ps->current_committed = ps->exceptions_per_area;
}
read_exception(ps, ps->current_committed - 1, &ce);
read_exception(ps, ps->area, ps->current_committed - 1, &ce);
*last_old_chunk = ce.old_chunk;
*last_new_chunk = ce.new_chunk;
@ -744,8 +746,8 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
*/
for (nr_consecutive = 1; nr_consecutive < ps->current_committed;
nr_consecutive++) {
read_exception(ps, ps->current_committed - 1 - nr_consecutive,
&ce);
read_exception(ps, ps->area,
ps->current_committed - 1 - nr_consecutive, &ce);
if (ce.old_chunk != *last_old_chunk - nr_consecutive ||
ce.new_chunk != *last_new_chunk - nr_consecutive)
break;