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bcache: handle c->uuids properly for bucket size > 8MB 

Bcache allocates a whole bucket to store c->uuids on cache device, and
allocates continuous pages to store it in-memory. When the bucket size
exceeds maximum allocable continuous pages, bch_cache_set_alloc() will
fail and cache device registration will fail.

This patch allocates c->uuids by alloc_meta_bucket_pages(), and uses
ilog2(meta_bucket_pages(c)) to indicate order of c->uuids pages when
free it. When writing c->uuids to cache device, its size is decided
by meta_bucket_pages(c) * PAGE_SECTORS. Now c->uuids is properly handled
for bucket size > 8MB.

Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2020-07-25 20:00:31 +08:00 committed by Jens Axboe
parent de1fafab64
commit 21e478ddb2
1 changed files with 6 additions and 4 deletions
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10
drivers/md/bcache/super.c
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@ -466,6 +466,7 @@ static int __uuid_write(struct cache_set *c)
BKEY_PADDED(key) k;
struct closure cl;
struct cache *ca;
unsigned int size;
closure_init_stack(&cl);
lockdep_assert_held(&bch_register_lock);
@ -473,7 +474,8 @@ static int __uuid_write(struct cache_set *c)
if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true))
return 1;
SET_KEY_SIZE(&k.key, c->sb.bucket_size);
size = meta_bucket_pages(&c->sb) * PAGE_SECTORS;
SET_KEY_SIZE(&k.key, size);
uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl);
closure_sync(&cl);
@ -1664,7 +1666,7 @@ static void cache_set_free(struct closure *cl)
}
bch_bset_sort_state_free(&c->sort);
free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c)));
free_pages((unsigned long) c->uuids, ilog2(meta_bucket_pages(&c->sb)));
if (c->moving_gc_wq)
destroy_workqueue(c->moving_gc_wq);
@ -1870,7 +1872,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
c->bucket_bits = ilog2(sb->bucket_size);
c->block_bits = ilog2(sb->block_size);
c->nr_uuids = bucket_bytes(c) / sizeof(struct uuid_entry);
c->nr_uuids = meta_bucket_bytes(&c->sb) / sizeof(struct uuid_entry);
c->devices_max_used = 0;
atomic_set(&c->attached_dev_nr, 0);
c->btree_pages = bucket_pages(c);
@ -1921,7 +1923,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER))
goto err;
c->uuids = alloc_bucket_pages(GFP_KERNEL, c);
c->uuids = alloc_meta_bucket_pages(GFP_KERNEL, &c->sb);
if (!c->uuids)
goto err;