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dm thin: initialize dm_thin_new_mapping returned by get_next_mapping 

As additional members are added to the dm_thin_new_mapping structure
care should be taken to make sure they get initialized before use.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mike Snitzer 2013-12-17 13:19:11 -05:00
parent 319e2e3f63
commit 16961b042d
1 changed files with 6 additions and 11 deletions
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17
drivers/md/dm-thin.c
View File

@ -751,13 +751,17 @@ static int ensure_next_mapping(struct pool *pool)
static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool)
{
struct dm_thin_new_mapping *r = pool->next_mapping;
struct dm_thin_new_mapping *m = pool->next_mapping;
BUG_ON(!pool->next_mapping);
memset(m, 0, sizeof(struct dm_thin_new_mapping));
INIT_LIST_HEAD(&m->list);
m->bio = NULL;
pool->next_mapping = NULL;
return r;
return m;
}
static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
@ -769,15 +773,10 @@ static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
struct pool *pool = tc->pool;
struct dm_thin_new_mapping *m = get_next_mapping(pool);
INIT_LIST_HEAD(&m->list);
m->quiesced = 0;
m->prepared = 0;
m->tc = tc;
m->virt_block = virt_block;
m->data_block = data_dest;
m->cell = cell;
m->err = 0;
m->bio = NULL;
if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list))
m->quiesced = 1;
@ -840,15 +839,12 @@ static void schedule_zero(struct thin_c *tc, dm_block_t virt_block,
struct pool *pool = tc->pool;
struct dm_thin_new_mapping *m = get_next_mapping(pool);
INIT_LIST_HEAD(&m->list);
m->quiesced = 1;
m->prepared = 0;
m->tc = tc;
m->virt_block = virt_block;
m->data_block = data_block;
m->cell = cell;
m->err = 0;
m->bio = NULL;
/*
* If the whole block of data is being overwritten or we are not
@ -1045,7 +1041,6 @@ static void process_discard(struct thin_c *tc, struct bio *bio)
m->data_block = lookup_result.block;
m->cell = cell;
m->cell2 = cell2;
m->err = 0;
m->bio = bio;
if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) {