diff options
author | 2015-10-09 08:42:44 +0300 | |
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committer | 2015-10-09 08:52:35 +0300 | |
commit | fdb8b20906f3546ba6c2f9f0686d8a5189516ba3 (patch) | |
tree | 6bb43dc8a42d6e9403763bc749f706939dd2bc60 /kernel/drivers/md/dm-cache-target.c | |
parent | cc84a1f21026270463b580f2564f9d71912b20db (diff) |
Kernel bump from 4.1.3-rt to 4.1.7-rt.
These changes brings a vanilla kernel from kernel.org, and the patch
applied for rt is patch-4.1.7-rt8.patch. No further changes needed.
Change-Id: Id8dd03c2ddd971e4d1d69b905f3069737053b700
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/md/dm-cache-target.c')
-rw-r--r-- | kernel/drivers/md/dm-cache-target.c | 58 |
1 files changed, 38 insertions, 20 deletions
diff --git a/kernel/drivers/md/dm-cache-target.c b/kernel/drivers/md/dm-cache-target.c index 7755af351..e049becaa 100644 --- a/kernel/drivers/md/dm-cache-target.c +++ b/kernel/drivers/md/dm-cache-target.c @@ -1445,16 +1445,43 @@ static void inc_miss_counter(struct cache *cache, struct bio *bio) &cache->stats.read_miss : &cache->stats.write_miss); } +/*----------------------------------------------------------------*/ + +struct old_oblock_lock { + struct policy_locker locker; + struct cache *cache; + struct prealloc *structs; + struct dm_bio_prison_cell *cell; +}; + +static int null_locker(struct policy_locker *locker, dm_oblock_t b) +{ + /* This should never be called */ + BUG(); + return 0; +} + +static int cell_locker(struct policy_locker *locker, dm_oblock_t b) +{ + struct old_oblock_lock *l = container_of(locker, struct old_oblock_lock, locker); + struct dm_bio_prison_cell *cell_prealloc = prealloc_get_cell(l->structs); + + return bio_detain(l->cache, b, NULL, cell_prealloc, + (cell_free_fn) prealloc_put_cell, + l->structs, &l->cell); +} + static void process_bio(struct cache *cache, struct prealloc *structs, struct bio *bio) { int r; bool release_cell = true; dm_oblock_t block = get_bio_block(cache, bio); - struct dm_bio_prison_cell *cell_prealloc, *old_ocell, *new_ocell; + struct dm_bio_prison_cell *cell_prealloc, *new_ocell; struct policy_result lookup_result; bool passthrough = passthrough_mode(&cache->features); bool discarded_block, can_migrate; + struct old_oblock_lock ool; /* * Check to see if that block is currently migrating. @@ -1469,8 +1496,12 @@ static void process_bio(struct cache *cache, struct prealloc *structs, discarded_block = is_discarded_oblock(cache, block); can_migrate = !passthrough && (discarded_block || spare_migration_bandwidth(cache)); + ool.locker.fn = cell_locker; + ool.cache = cache; + ool.structs = structs; + ool.cell = NULL; r = policy_map(cache->policy, block, true, can_migrate, discarded_block, - bio, &lookup_result); + bio, &ool.locker, &lookup_result); if (r == -EWOULDBLOCK) /* migration has been denied */ @@ -1527,27 +1558,11 @@ static void process_bio(struct cache *cache, struct prealloc *structs, break; case POLICY_REPLACE: - cell_prealloc = prealloc_get_cell(structs); - r = bio_detain(cache, lookup_result.old_oblock, bio, cell_prealloc, - (cell_free_fn) prealloc_put_cell, - structs, &old_ocell); - if (r > 0) { - /* - * We have to be careful to avoid lock inversion of - * the cells. So we back off, and wait for the - * old_ocell to become free. - */ - policy_force_mapping(cache->policy, block, - lookup_result.old_oblock); - atomic_inc(&cache->stats.cache_cell_clash); - break; - } atomic_inc(&cache->stats.demotion); atomic_inc(&cache->stats.promotion); - demote_then_promote(cache, structs, lookup_result.old_oblock, block, lookup_result.cblock, - old_ocell, new_ocell); + ool.cell, new_ocell); release_cell = false; break; @@ -2595,6 +2610,9 @@ static int __cache_map(struct cache *cache, struct bio *bio, struct dm_bio_priso bool discarded_block; struct policy_result lookup_result; struct per_bio_data *pb = init_per_bio_data(bio, pb_data_size); + struct old_oblock_lock ool; + + ool.locker.fn = null_locker; if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) { /* @@ -2633,7 +2651,7 @@ static int __cache_map(struct cache *cache, struct bio *bio, struct dm_bio_priso discarded_block = is_discarded_oblock(cache, block); r = policy_map(cache->policy, block, false, can_migrate, discarded_block, - bio, &lookup_result); + bio, &ool.locker, &lookup_result); if (r == -EWOULDBLOCK) { cell_defer(cache, *cell, true); return DM_MAPIO_SUBMITTED; |