mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
Fix dm bufio shrinker to properly zero-fill all fields.
Fix race in dm cache that caused improper reporting of the number of dirty blocks in the cache. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJT28K2AAoJEMUj8QotnQNau30IAOAiW683+TnSpq4MXRywUNKl gaLtC65Q04KesZ2FtZYaYUOdfF8nsmuyBiSlHl8RLzGWCYJcQQAMdXVEgCZ+qXKX OhD85zhySXUamvKfq2wX452kAK6O2eR//Azc3d57uWhGboXTZrqTDc4QLRDJQoAF 8b4g4r/NCV6fAtHtEfB9JtLyrk1kOUGpHdF2rSFy20IUKs1RPZRZzNYEh5KB9ZWI DeoZY6GrqR1bLlOAL3Usd43fYGdgv+Mn1HaR+Xgn7LVl2HpRIts4M8Y54F0xko4F T26rJMZlMppolgZBXElrDm8ly6bDPglfU7ymJMleiPEdCLhpLX/jqoPEtgsqGI8= =pQe5 -----END PGP SIGNATURE----- Merge tag 'dm-3.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm Pull device mapper fixes from Mike Snitzer: "Fix dm bufio shrinker to properly zero-fill all fields. Fix race in dm cache that caused improper reporting of the number of dirty blocks in the cache" * tag 'dm-3.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm cache: fix race affecting dirty block count dm bufio: fully initialize shrinker
This commit is contained in:
commit
818be5894e
2 changed files with 7 additions and 8 deletions
|
@ -1541,7 +1541,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
|
|||
BUG_ON(block_size < 1 << SECTOR_SHIFT ||
|
||||
(block_size & (block_size - 1)));
|
||||
|
||||
c = kmalloc(sizeof(*c), GFP_KERNEL);
|
||||
c = kzalloc(sizeof(*c), GFP_KERNEL);
|
||||
if (!c) {
|
||||
r = -ENOMEM;
|
||||
goto bad_client;
|
||||
|
|
|
@ -231,7 +231,7 @@ struct cache {
|
|||
/*
|
||||
* cache_size entries, dirty if set
|
||||
*/
|
||||
dm_cblock_t nr_dirty;
|
||||
atomic_t nr_dirty;
|
||||
unsigned long *dirty_bitset;
|
||||
|
||||
/*
|
||||
|
@ -492,7 +492,7 @@ static bool is_dirty(struct cache *cache, dm_cblock_t b)
|
|||
static void set_dirty(struct cache *cache, dm_oblock_t oblock, dm_cblock_t cblock)
|
||||
{
|
||||
if (!test_and_set_bit(from_cblock(cblock), cache->dirty_bitset)) {
|
||||
cache->nr_dirty = to_cblock(from_cblock(cache->nr_dirty) + 1);
|
||||
atomic_inc(&cache->nr_dirty);
|
||||
policy_set_dirty(cache->policy, oblock);
|
||||
}
|
||||
}
|
||||
|
@ -501,8 +501,7 @@ static void clear_dirty(struct cache *cache, dm_oblock_t oblock, dm_cblock_t cbl
|
|||
{
|
||||
if (test_and_clear_bit(from_cblock(cblock), cache->dirty_bitset)) {
|
||||
policy_clear_dirty(cache->policy, oblock);
|
||||
cache->nr_dirty = to_cblock(from_cblock(cache->nr_dirty) - 1);
|
||||
if (!from_cblock(cache->nr_dirty))
|
||||
if (atomic_dec_return(&cache->nr_dirty) == 0)
|
||||
dm_table_event(cache->ti->table);
|
||||
}
|
||||
}
|
||||
|
@ -2269,7 +2268,7 @@ static int cache_create(struct cache_args *ca, struct cache **result)
|
|||
atomic_set(&cache->quiescing_ack, 0);
|
||||
|
||||
r = -ENOMEM;
|
||||
cache->nr_dirty = 0;
|
||||
atomic_set(&cache->nr_dirty, 0);
|
||||
cache->dirty_bitset = alloc_bitset(from_cblock(cache->cache_size));
|
||||
if (!cache->dirty_bitset) {
|
||||
*error = "could not allocate dirty bitset";
|
||||
|
@ -2808,7 +2807,7 @@ static void cache_status(struct dm_target *ti, status_type_t type,
|
|||
|
||||
residency = policy_residency(cache->policy);
|
||||
|
||||
DMEMIT("%u %llu/%llu %u %llu/%llu %u %u %u %u %u %u %llu ",
|
||||
DMEMIT("%u %llu/%llu %u %llu/%llu %u %u %u %u %u %u %lu ",
|
||||
(unsigned)(DM_CACHE_METADATA_BLOCK_SIZE >> SECTOR_SHIFT),
|
||||
(unsigned long long)(nr_blocks_metadata - nr_free_blocks_metadata),
|
||||
(unsigned long long)nr_blocks_metadata,
|
||||
|
@ -2821,7 +2820,7 @@ static void cache_status(struct dm_target *ti, status_type_t type,
|
|||
(unsigned) atomic_read(&cache->stats.write_miss),
|
||||
(unsigned) atomic_read(&cache->stats.demotion),
|
||||
(unsigned) atomic_read(&cache->stats.promotion),
|
||||
(unsigned long long) from_cblock(cache->nr_dirty));
|
||||
(unsigned long) atomic_read(&cache->nr_dirty));
|
||||
|
||||
if (writethrough_mode(&cache->features))
|
||||
DMEMIT("1 writethrough ");
|
||||
|
|
Loading…
Reference in a new issue