bcache: A block layer cache

Does writethrough and writeback caching, handles unclean shutdown, and
has a bunch of other nifty features motivated by real world usage.

See the wiki at http://bcache.evilpiepirate.org for more.

Signed-off-by: Kent Overstreet <koverstreet@google.com>

1 files changed, 1941 insertions, 0 deletions

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
new file mode 100644
index 000000000000..31ef47f1f3b6
--- /dev/null
+++ b/drivers/md/bcache/super.c
@@ -0,0 +1,1941 @@
+/*
+ * bcache setup/teardown code, and some metadata io - read a superblock and
+ * figure out what to do with it.
+ *
+ * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
+ * Copyright 2012 Google, Inc.
+ */
+
+#include "bcache.h"
+#include "btree.h"
+#include "debug.h"
+#include "request.h"
+
+#include <linux/buffer_head.h>
+#include <linux/debugfs.h>
+#include <linux/genhd.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
+#include <linux/sysfs.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
+
+static const char bcache_magic[] = {
+        0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
+        0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81
+};
+
+static const char invalid_uuid[] = {
+        0xa0, 0x3e, 0xf8, 0xed, 0x3e, 0xe1, 0xb8, 0x78,
+        0xc8, 0x50, 0xfc, 0x5e, 0xcb, 0x16, 0xcd, 0x99
+};
+
+/* Default is -1; we skip past it for struct cached_dev's cache mode */
+const char * const bch_cache_modes[] = {
+        "default",
+        "writethrough",
+        "writeback",
+        "writearound",
+        "none",
+        NULL
+};
+
+struct uuid_entry_v0 {
+        uint8_t         uuid[16];
+        uint8_t         label[32];
+        uint32_t        first_reg;
+        uint32_t        last_reg;
+        uint32_t        invalidated;
+        uint32_t        pad;
+};
+
+static struct kobject *bcache_kobj;
+struct mutex bch_register_lock;
+LIST_HEAD(bch_cache_sets);
+static LIST_HEAD(uncached_devices);
+
+static int bcache_major, bcache_minor;
+static wait_queue_head_t unregister_wait;
+struct workqueue_struct *bcache_wq;
+
+#define BTREE_MAX_PAGES         (256 * 1024 / PAGE_SIZE)
+
+static void bio_split_pool_free(struct bio_split_pool *p)
+{
+        if (p->bio_split)
+                bioset_free(p->bio_split);
+
+}
+
+static int bio_split_pool_init(struct bio_split_pool *p)
+{
+        p->bio_split = bioset_create(4, 0);
+        if (!p->bio_split)
+                return -ENOMEM;
+
+        p->bio_split_hook = mempool_create_kmalloc_pool(4,
+                                sizeof(struct bio_split_hook));
+        if (!p->bio_split_hook)
+                return -ENOMEM;
+
+        return 0;
+}
+
+/* Superblock */
+
+static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
+                              struct page **res)
+{
+        const char *err;
+        struct cache_sb *s;
+        struct buffer_head *bh = __bread(bdev, 1, SB_SIZE);
+        unsigned i;
+
+        if (!bh)
+                return "IO error";
+
+        s = (struct cache_sb *) bh->b_data;
+
+        sb->offset              = le64_to_cpu(s->offset);
+        sb->version             = le64_to_cpu(s->version);
+
+        memcpy(sb->magic,       s->magic, 16);
+        memcpy(sb->uuid,        s->uuid, 16);
+        memcpy(sb->set_uuid,    s->set_uuid, 16);
+        memcpy(sb->label,       s->label, SB_LABEL_SIZE);
+
+        sb->flags               = le64_to_cpu(s->flags);
+        sb->seq                 = le64_to_cpu(s->seq);
+
+        sb->nbuckets            = le64_to_cpu(s->nbuckets);
+        sb->block_size          = le16_to_cpu(s->block_size);
+        sb->bucket_size         = le16_to_cpu(s->bucket_size);
+
+        sb->nr_in_set           = le16_to_cpu(s->nr_in_set);
+        sb->nr_this_dev         = le16_to_cpu(s->nr_this_dev);
+        sb->last_mount          = le32_to_cpu(s->last_mount);
+
+        sb->first_bucket        = le16_to_cpu(s->first_bucket);
+        sb->keys                = le16_to_cpu(s->keys);
+
+        for (i = 0; i < SB_JOURNAL_BUCKETS; i++)
+                sb->d[i] = le64_to_cpu(s->d[i]);
+
+        pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u",
+                 sb->version, sb->flags, sb->seq, sb->keys);
+
+        err = "Not a bcache superblock";
+        if (sb->offset != SB_SECTOR)
+                goto err;
+
+        if (memcmp(sb->magic, bcache_magic, 16))
+                goto err;
+
+        err = "Too many journal buckets";
+        if (sb->keys > SB_JOURNAL_BUCKETS)
+                goto err;
+
+        err = "Bad checksum";
+        if (s->csum != csum_set(s))
+                goto err;
+
+        err = "Bad UUID";
+        if (is_zero(sb->uuid, 16))
+                goto err;
+
+        err = "Unsupported superblock version";
+        if (sb->version > BCACHE_SB_VERSION)
+                goto err;
+
+        err = "Bad block/bucket size";
+        if (!is_power_of_2(sb->block_size) || sb->block_size > PAGE_SECTORS ||
+            !is_power_of_2(sb->bucket_size) || sb->bucket_size < PAGE_SECTORS)
+                goto err;
+
+        err = "Too many buckets";
+        if (sb->nbuckets > LONG_MAX)
+                goto err;
+
+        err = "Not enough buckets";
+        if (sb->nbuckets < 1 << 7)
+                goto err;
+
+        err = "Invalid superblock: device too small";
+        if (get_capacity(bdev->bd_disk) < sb->bucket_size * sb->nbuckets)
+                goto err;
+
+        if (sb->version == CACHE_BACKING_DEV)
+                goto out;
+
+        err = "Bad UUID";
+        if (is_zero(sb->set_uuid, 16))
+                goto err;
+
+        err = "Bad cache device number in set";
+        if (!sb->nr_in_set ||
+            sb->nr_in_set <= sb->nr_this_dev ||
+            sb->nr_in_set > MAX_CACHES_PER_SET)
+                goto err;
+
+        err = "Journal buckets not sequential";
+        for (i = 0; i < sb->keys; i++)
+                if (sb->d[i] != sb->first_bucket + i)
+                        goto err;
+
+        err = "Too many journal buckets";
+        if (sb->first_bucket + sb->keys > sb->nbuckets)
+                goto err;
+
+        err = "Invalid superblock: first bucket comes before end of super";
+        if (sb->first_bucket * sb->bucket_size < 16)
+                goto err;
+out:
+        sb->last_mount = get_seconds();
+        err = NULL;
+
+        get_page(bh->b_page);
+        *res = bh->b_page;
+err:
+        put_bh(bh);
+        return err;
+}
+
+static void write_bdev_super_endio(struct bio *bio, int error)
+{
+        struct cached_dev *dc = bio->bi_private;
+        /* XXX: error checking */
+
+        closure_put(&dc->sb_write.cl);
+}
+
+static void __write_super(struct cache_sb *sb, struct bio *bio)
+{
+        struct cache_sb *out = page_address(bio->bi_io_vec[0].bv_page);
+        unsigned i;
+
+        bio->bi_sector  = SB_SECTOR;
+        bio->bi_rw      = REQ_SYNC|REQ_META;
+        bio->bi_size    = SB_SIZE;
+        bio_map(bio, NULL);
+
+        out->offset             = cpu_to_le64(sb->offset);
+        out->version            = cpu_to_le64(sb->version);
+
+        memcpy(out->uuid,       sb->uuid, 16);
+        memcpy(out->set_uuid,   sb->set_uuid, 16);
+        memcpy(out->label,      sb->label, SB_LABEL_SIZE);
+
+        out->flags              = cpu_to_le64(sb->flags);
+        out->seq                = cpu_to_le64(sb->seq);
+
+        out->last_mount         = cpu_to_le32(sb->last_mount);
+        out->first_bucket       = cpu_to_le16(sb->first_bucket);
+        out->keys               = cpu_to_le16(sb->keys);
+
+        for (i = 0; i < sb->keys; i++)
+                out->d[i] = cpu_to_le64(sb->d[i]);
+
+        out->csum = csum_set(out);
+
+        pr_debug("ver %llu, flags %llu, seq %llu",
+                 sb->version, sb->flags, sb->seq);
+
+        submit_bio(REQ_WRITE, bio);
+}
+
+void bch_write_bdev_super(struct cached_dev *dc, struct closure *parent)
+{
+        struct closure *cl = &dc->sb_write.cl;
+        struct bio *bio = &dc->sb_bio;
+
+        closure_lock(&dc->sb_write, parent);
+
+        bio_reset(bio);
+        bio->bi_bdev    = dc->bdev;
+        bio->bi_end_io  = write_bdev_super_endio;
+        bio->bi_private = dc;
+
+        closure_get(cl);
+        __write_super(&dc->sb, bio);
+
+        closure_return(cl);
+}
+
+static void write_super_endio(struct bio *bio, int error)
+{
+        struct cache *ca = bio->bi_private;
+
+        bch_count_io_errors(ca, error, "writing superblock");
+        closure_put(&ca->set->sb_write.cl);
+}
+
+void bcache_write_super(struct cache_set *c)
+{
+        struct closure *cl = &c->sb_write.cl;
+        struct cache *ca;
+        unsigned i;
+
+        closure_lock(&c->sb_write, &c->cl);
+
+        c->sb.seq++;
+
+        for_each_cache(ca, c, i) {
+                struct bio *bio = &ca->sb_bio;
+
+                ca->sb.version          = BCACHE_SB_VERSION;
+                ca->sb.seq              = c->sb.seq;
+                ca->sb.last_mount       = c->sb.last_mount;
+
+                SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb));
+
+                bio_reset(bio);
+                bio->bi_bdev    = ca->bdev;
+                bio->bi_end_io  = write_super_endio;
+                bio->bi_private = ca;
+
+                closure_get(cl);
+                __write_super(&ca->sb, bio);
+        }
+
+        closure_return(cl);
+}
+
+/* UUID io */
+
+static void uuid_endio(struct bio *bio, int error)
+{
+        struct closure *cl = bio->bi_private;
+        struct cache_set *c = container_of(cl, struct cache_set, uuid_write.cl);
+
+        cache_set_err_on(error, c, "accessing uuids");
+        bch_bbio_free(bio, c);
+        closure_put(cl);
+}
+
+static void uuid_io(struct cache_set *c, unsigned long rw,
+                    struct bkey *k, struct closure *parent)
+{
+        struct closure *cl = &c->uuid_write.cl;
+        struct uuid_entry *u;
+        unsigned i;
+
+        BUG_ON(!parent);
+        closure_lock(&c->uuid_write, parent);
+
+        for (i = 0; i < KEY_PTRS(k); i++) {
+                struct bio *bio = bch_bbio_alloc(c);
+
+                bio->bi_rw      = REQ_SYNC|REQ_META|rw;
+                bio->bi_size    = KEY_SIZE(k) << 9;
+
+                bio->bi_end_io  = uuid_endio;
+                bio->bi_private = cl;
+                bio_map(bio, c->uuids);
+
+                bch_submit_bbio(bio, c, k, i);
+
+                if (!(rw & WRITE))
+                        break;
+        }
+
+        pr_debug("%s UUIDs at %s", rw & REQ_WRITE ? "wrote" : "read",
+                 pkey(&c->uuid_bucket));
+
+        for (u = c->uuids; u < c->uuids + c->nr_uuids; u++)
+                if (!is_zero(u->uuid, 16))
+                        pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u",
+                                 u - c->uuids, u->uuid, u->label,
+                                 u->first_reg, u->last_reg, u->invalidated);
+
+        closure_return(cl);
+}
+
+static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl)
+{
+        struct bkey *k = &j->uuid_bucket;
+
+        if (__bch_ptr_invalid(c, 1, k))
+                return "bad uuid pointer";
+
+        bkey_copy(&c->uuid_bucket, k);
+        uuid_io(c, READ_SYNC, k, cl);
+
+        if (j->version < BCACHE_JSET_VERSION_UUIDv1) {
+                struct uuid_entry_v0    *u0 = (void *) c->uuids;
+                struct uuid_entry       *u1 = (void *) c->uuids;
+                int i;
+
+                closure_sync(cl);
+
+                /*
+                 * Since the new uuid entry is bigger than the old, we have to
+                 * convert starting at the highest memory address and work down
+                 * in order to do it in place
+                 */
+
+                for (i = c->nr_uuids - 1;
+                     i >= 0;
+                     --i) {
+                        memcpy(u1[i].uuid,      u0[i].uuid, 16);
+                        memcpy(u1[i].label,     u0[i].label, 32);
+
+                        u1[i].first_reg         = u0[i].first_reg;
+                        u1[i].last_reg          = u0[i].last_reg;
+                        u1[i].invalidated       = u0[i].invalidated;
+
+                        u1[i].flags     = 0;
+                        u1[i].sectors   = 0;
+                }
+        }
+
+        return NULL;
+}
+
+static int __uuid_write(struct cache_set *c)
+{
+        BKEY_PADDED(key) k;
+        struct closure cl;
+        closure_init_stack(&cl);
+
+        lockdep_assert_held(&bch_register_lock);
+
+        if (bch_bucket_alloc_set(c, WATERMARK_METADATA, &k.key, 1, &cl))
+                return 1;
+
+        SET_KEY_SIZE(&k.key, c->sb.bucket_size);
+        uuid_io(c, REQ_WRITE, &k.key, &cl);
+        closure_sync(&cl);
+
+        bkey_copy(&c->uuid_bucket, &k.key);
+        __bkey_put(c, &k.key);
+        return 0;
+}
+
+int bch_uuid_write(struct cache_set *c)
+{
+        int ret = __uuid_write(c);
+
+        if (!ret)
+                bch_journal_meta(c, NULL);
+
+        return ret;
+}
+
+static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid)
+{
+        struct uuid_entry *u;
+
+        for (u = c->uuids;
+             u < c->uuids + c->nr_uuids; u++)
+                if (!memcmp(u->uuid, uuid, 16))
+                        return u;
+
+        return NULL;
+}
+
+static struct uuid_entry *uuid_find_empty(struct cache_set *c)
+{
+        static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+        return uuid_find(c, zero_uuid);
+}
+
+/*
+ * Bucket priorities/gens:
+ *
+ * For each bucket, we store on disk its
+   * 8 bit gen
+   * 16 bit priority
+ *
+ * See alloc.c for an explanation of the gen. The priority is used to implement
+ * lru (and in the future other) cache replacement policies; for most purposes
+ * it's just an opaque integer.
+ *
+ * The gens and the priorities don't have a whole lot to do with each other, and
+ * it's actually the gens that must be written out at specific times - it's no
+ * big deal if the priorities don't get written, if we lose them we just reuse
+ * buckets in suboptimal order.
+ *
+ * On disk they're stored in a packed array, and in as many buckets are required
+ * to fit them all. The buckets we use to store them form a list; the journal
+ * header points to the first bucket, the first bucket points to the second
+ * bucket, et cetera.
+ *
+ * This code is used by the allocation code; periodically (whenever it runs out
+ * of buckets to allocate from) the allocation code will invalidate some
+ * buckets, but it can't use those buckets until their new gens are safely on
+ * disk.
+ */
+
+static void prio_endio(struct bio *bio, int error)
+{
+        struct cache *ca = bio->bi_private;
+
+        cache_set_err_on(error, ca->set, "accessing priorities");
+        bch_bbio_free(bio, ca->set);
+        closure_put(&ca->prio);
+}
+
+static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
+{
+        struct closure *cl = &ca->prio;
+        struct bio *bio = bch_bbio_alloc(ca->set);
+
+        closure_init_stack(cl);
+
+        bio->bi_sector  = bucket * ca->sb.bucket_size;
+        bio->bi_bdev    = ca->bdev;
+        bio->bi_rw      = REQ_SYNC|REQ_META|rw;
+        bio->bi_size    = bucket_bytes(ca);
+
+        bio->bi_end_io  = prio_endio;
+        bio->bi_private = ca;
+        bio_map(bio, ca->disk_buckets);
+
+        closure_bio_submit(bio, &ca->prio, ca);
+        closure_sync(cl);
+}
+
+#define buckets_free(c) "free %zu, free_inc %zu, unused %zu",           \
+        fifo_used(&c->free), fifo_used(&c->free_inc), fifo_used(&c->unused)
+
+void bch_prio_write(struct cache *ca)
+{
+        int i;
+        struct bucket *b;
+        struct closure cl;
+
+        closure_init_stack(&cl);
+
+        lockdep_assert_held(&ca->set->bucket_lock);
+
+        for (b = ca->buckets;
+             b < ca->buckets + ca->sb.nbuckets; b++)
+                b->disk_gen = b->gen;
+
+        ca->disk_buckets->seq++;
+
+        atomic_long_add(ca->sb.bucket_size * prio_buckets(ca),
+                        &ca->meta_sectors_written);
+
+        pr_debug("free %zu, free_inc %zu, unused %zu", fifo_used(&ca->free),
+                 fifo_used(&ca->free_inc), fifo_used(&ca->unused));
+        blktrace_msg(ca, "Starting priorities: " buckets_free(ca));
+
+        for (i = prio_buckets(ca) - 1; i >= 0; --i) {
+                long bucket;
+                struct prio_set *p = ca->disk_buckets;
+                struct bucket_disk *d = p->data, *end = d + prios_per_bucket(ca);
+
+                for (b = ca->buckets + i * prios_per_bucket(ca);
+                     b < ca->buckets + ca->sb.nbuckets && d < end;
+                     b++, d++) {
+                        d->prio = cpu_to_le16(b->prio);
+                        d->gen = b->gen;
+                }
+
+                p->next_bucket  = ca->prio_buckets[i + 1];
+                p->magic        = pset_magic(ca);
+                p->csum         = crc64(&p->magic, bucket_bytes(ca) - 8);
+
+                bucket = bch_bucket_alloc(ca, WATERMARK_PRIO, &cl);
+                BUG_ON(bucket == -1);
+
+                mutex_unlock(&ca->set->bucket_lock);
+                prio_io(ca, bucket, REQ_WRITE);
+                mutex_lock(&ca->set->bucket_lock);
+
+                ca->prio_buckets[i] = bucket;
+                atomic_dec_bug(&ca->buckets[bucket].pin);
+        }
+
+        mutex_unlock(&ca->set->bucket_lock);
+
+        bch_journal_meta(ca->set, &cl);
+        closure_sync(&cl);
+
+        mutex_lock(&ca->set->bucket_lock);
+
+        ca->need_save_prio = 0;
+
+        /*
+         * Don't want the old priorities to get garbage collected until after we
+         * finish writing the new ones, and they're journalled
+         */
+        for (i = 0; i < prio_buckets(ca); i++)
+                ca->prio_last_buckets[i] = ca->prio_buckets[i];
+}
+
+static void prio_read(struct cache *ca, uint64_t bucket)
+{
+        struct prio_set *p = ca->disk_buckets;
+        struct bucket_disk *d = p->data + prios_per_bucket(ca), *end = d;
+        struct bucket *b;
+        unsigned bucket_nr = 0;
+
+        for (b = ca->buckets;
+             b < ca->buckets + ca->sb.nbuckets;
+             b++, d++) {
+                if (d == end) {
+                        ca->prio_buckets[bucket_nr] = bucket;
+                        ca->prio_last_buckets[bucket_nr] = bucket;
+                        bucket_nr++;
+
+                        prio_io(ca, bucket, READ_SYNC);
+
+                        if (p->csum != crc64(&p->magic, bucket_bytes(ca) - 8))
+                                pr_warn("bad csum reading priorities");
+
+                        if (p->magic != pset_magic(ca))
+                                pr_warn("bad magic reading priorities");
+
+                        bucket = p->next_bucket;
+                        d = p->data;
+                }
+
+                b->prio = le16_to_cpu(d->prio);
+                b->gen = b->disk_gen = b->last_gc = b->gc_gen = d->gen;
+        }
+}
+
+/* Bcache device */
+
+static int open_dev(struct block_device *b, fmode_t mode)
+{
+        struct bcache_device *d = b->bd_disk->private_data;
+        if (atomic_read(&d->closing))
+                return -ENXIO;
+
+        closure_get(&d->cl);
+        return 0;
+}
+
+static int release_dev(struct gendisk *b, fmode_t mode)
+{
+        struct bcache_device *d = b->private_data;
+        closure_put(&d->cl);
+        return 0;
+}
+
+static int ioctl_dev(struct block_device *b, fmode_t mode,
+                     unsigned int cmd, unsigned long arg)
+{
+        struct bcache_device *d = b->bd_disk->private_data;
+        return d->ioctl(d, mode, cmd, arg);
+}
+
+static const struct block_device_operations bcache_ops = {
+        .open           = open_dev,
+        .release        = release_dev,
+        .ioctl          = ioctl_dev,
+        .owner          = THIS_MODULE,
+};
+
+void bcache_device_stop(struct bcache_device *d)
+{
+        if (!atomic_xchg(&d->closing, 1))
+                closure_queue(&d->cl);
+}
+
+static void bcache_device_detach(struct bcache_device *d)
+{
+        lockdep_assert_held(&bch_register_lock);
+
+        if (atomic_read(&d->detaching)) {
+                struct uuid_entry *u = d->c->uuids + d->id;
+
+                SET_UUID_FLASH_ONLY(u, 0);
+                memcpy(u->uuid, invalid_uuid, 16);
+                u->invalidated = cpu_to_le32(get_seconds());
+                bch_uuid_write(d->c);
+
+                atomic_set(&d->detaching, 0);
+        }
+
+        d->c->devices[d->id] = NULL;
+        closure_put(&d->c->caching);
+        d->c = NULL;
+}
+
+static void bcache_device_attach(struct bcache_device *d, struct cache_set *c,
+                                 unsigned id)
+{
+        BUG_ON(test_bit(CACHE_SET_STOPPING, &c->flags));
+
+        d->id = id;
+        d->c = c;
+        c->devices[id] = d;
+
+        closure_get(&c->caching);
+}
+
+static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
+                               const char *name)
+{
+        snprintf(d->name, BCACHEDEVNAME_SIZE,
+                 "%s%u", name, d->id);
+
+        WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") ||
+             sysfs_create_link(&c->kobj, &d->kobj, d->name),
+             "Couldn't create device <-> cache set symlinks");
+}
+
+static void bcache_device_free(struct bcache_device *d)
+{
+        lockdep_assert_held(&bch_register_lock);
+
+        pr_info("%s stopped", d->disk->disk_name);
+
+        if (d->c)
+                bcache_device_detach(d);
+
+        if (d->disk)
+                del_gendisk(d->disk);
+        if (d->disk && d->disk->queue)
+                blk_cleanup_queue(d->disk->queue);
+        if (d->disk)
+                put_disk(d->disk);
+
+        bio_split_pool_free(&d->bio_split_hook);
+        if (d->unaligned_bvec)
+                mempool_destroy(d->unaligned_bvec);
+        if (d->bio_split)
+                bioset_free(d->bio_split);
+
+        closure_debug_destroy(&d->cl);
+}
+
+static int bcache_device_init(struct bcache_device *d, unsigned block_size)
+{
+        struct request_queue *q;
+
+        if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
+            !(d->unaligned_bvec = mempool_create_kmalloc_pool(1,
+                                sizeof(struct bio_vec) * BIO_MAX_PAGES)) ||
+            bio_split_pool_init(&d->bio_split_hook))
+
+                return -ENOMEM;
+
+        d->disk = alloc_disk(1);
+        if (!d->disk)
+                return -ENOMEM;
+
+        snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", bcache_minor);
+
+        d->disk->major          = bcache_major;
+        d->disk->first_minor    = bcache_minor++;
+        d->disk->fops           = &bcache_ops;
+        d->disk->private_data   = d;
+
+        q = blk_alloc_queue(GFP_KERNEL);
+        if (!q)
+                return -ENOMEM;
+
+        blk_queue_make_request(q, NULL);
+        d->disk->queue                  = q;
+        q->queuedata                    = d;
+        q->backing_dev_info.congested_data = d;
+        q->limits.max_hw_sectors        = UINT_MAX;
+        q->limits.max_sectors           = UINT_MAX;
+        q->limits.max_segment_size      = UINT_MAX;
+        q->limits.max_segments          = BIO_MAX_PAGES;
+        q->limits.max_discard_sectors   = UINT_MAX;
+        q->limits.io_min                = block_size;
+        q->limits.logical_block_size    = block_size;
+        q->limits.physical_block_size   = block_size;
+        set_bit(QUEUE_FLAG_NONROT,      &d->disk->queue->queue_flags);
+        set_bit(QUEUE_FLAG_DISCARD,     &d->disk->queue->queue_flags);
+
+        return 0;
+}
+
+/* Cached device */
+
+static void calc_cached_dev_sectors(struct cache_set *c)
+{
+        uint64_t sectors = 0;
+        struct cached_dev *dc;
+
+        list_for_each_entry(dc, &c->cached_devs, list)
+                sectors += bdev_sectors(dc->bdev);
+
+        c->cached_dev_sectors = sectors;
+}
+
+void bch_cached_dev_run(struct cached_dev *dc)
+{
+        struct bcache_device *d = &dc->disk;
+
+        if (atomic_xchg(&dc->running, 1))
+                return;
+
+        if (!d->c &&
+            BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) {
+                struct closure cl;
+                closure_init_stack(&cl);
+
+                SET_BDEV_STATE(&dc->sb, BDEV_STATE_STALE);
+                bch_write_bdev_super(dc, &cl);
+                closure_sync(&cl);
+        }
+
+        add_disk(d->disk);
+#if 0
+        char *env[] = { "SYMLINK=label" , NULL };
+        kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
+#endif
+        if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") ||
+            sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache"))
+                pr_debug("error creating sysfs link");
+}
+
+static void cached_dev_detach_finish(struct work_struct *w)
+{
+        struct cached_dev *dc = container_of(w, struct cached_dev, detach);
+        char buf[BDEVNAME_SIZE];
+        struct closure cl;
+        closure_init_stack(&cl);
+
+        BUG_ON(!atomic_read(&dc->disk.detaching));
+        BUG_ON(atomic_read(&dc->count));
+
+        sysfs_remove_link(&dc->disk.c->kobj, dc->disk.name);
+        sysfs_remove_link(&dc->disk.kobj, "cache");
+
+        mutex_lock(&bch_register_lock);
+
+        memset(&dc->sb.set_uuid, 0, 16);
+        SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE);
+
+        bch_write_bdev_super(dc, &cl);
+        closure_sync(&cl);
+
+        bcache_device_detach(&dc->disk);
+        list_move(&dc->list, &uncached_devices);
+
+        mutex_unlock(&bch_register_lock);
+
+        pr_info("Caching disabled for %s", bdevname(dc->bdev, buf));
+
+        /* Drop ref we took in cached_dev_detach() */
+        closure_put(&dc->disk.cl);
+}
+
+void bch_cached_dev_detach(struct cached_dev *dc)
+{
+        lockdep_assert_held(&bch_register_lock);
+
+        if (atomic_read(&dc->disk.closing))
+                return;
+
+        if (atomic_xchg(&dc->disk.detaching, 1))
+                return;
+
+        /*
+         * Block the device from being closed and freed until we're finished
+         * detaching
+         */
+        closure_get(&dc->disk.cl);
+
+        bch_writeback_queue(dc);
+        cached_dev_put(dc);
+}
+
+int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
+{
+        uint32_t rtime = cpu_to_le32(get_seconds());
+        struct uuid_entry *u;
+        char buf[BDEVNAME_SIZE];
+
+        bdevname(dc->bdev, buf);
+
+        if (memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16))
+                return -ENOENT;
+
+        if (dc->disk.c) {
+                pr_err("Can't attach %s: already attached", buf);
+                return -EINVAL;
+        }
+
+        if (test_bit(CACHE_SET_STOPPING, &c->flags)) {
+                pr_err("Can't attach %s: shutting down", buf);
+                return -EINVAL;
+        }
+
+        if (dc->sb.block_size < c->sb.block_size) {
+                /* Will die */
+                pr_err("Couldn't attach %s: block size "
+                       "less than set's block size", buf);
+                return -EINVAL;
+        }
+
+        u = uuid_find(c, dc->sb.uuid);
+
+        if (u &&
+            (BDEV_STATE(&dc->sb) == BDEV_STATE_STALE ||
+             BDEV_STATE(&dc->sb) == BDEV_STATE_NONE)) {
+                memcpy(u->uuid, invalid_uuid, 16);
+                u->invalidated = cpu_to_le32(get_seconds());
+                u = NULL;
+        }
+
+        if (!u) {
+                if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
+                        pr_err("Couldn't find uuid for %s in set", buf);
+                        return -ENOENT;
+                }
+
+                u = uuid_find_empty(c);
+                if (!u) {
+                        pr_err("Not caching %s, no room for UUID", buf);
+                        return -EINVAL;
+                }
+        }
+
+        /* Deadlocks since we're called via sysfs...
+        sysfs_remove_file(&dc->kobj, &sysfs_attach);
+         */
+
+        if (is_zero(u->uuid, 16)) {
+                struct closure cl;
+                closure_init_stack(&cl);
+
+                memcpy(u->uuid, dc->sb.uuid, 16);
+                memcpy(u->label, dc->sb.label, SB_LABEL_SIZE);
+                u->first_reg = u->last_reg = rtime;
+                bch_uuid_write(c);
+
+                memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16);
+                SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN);
+
+                bch_write_bdev_super(dc, &cl);
+                closure_sync(&cl);
+        } else {
+                u->last_reg = rtime;
+                bch_uuid_write(c);
+        }
+
+        bcache_device_attach(&dc->disk, c, u - c->uuids);
+        bcache_device_link(&dc->disk, c, "bdev");
+        list_move(&dc->list, &c->cached_devs);
+        calc_cached_dev_sectors(c);
+
+        smp_wmb();
+        /*
+         * dc->c must be set before dc->count != 0 - paired with the mb in
+         * cached_dev_get()
+         */
+        atomic_set(&dc->count, 1);
+
+        if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
+                atomic_set(&dc->has_dirty, 1);
+                atomic_inc(&dc->count);
+                bch_writeback_queue(dc);
+        }
+
+        bch_cached_dev_run(dc);
+
+        pr_info("Caching %s as %s on set %pU",
+                bdevname(dc->bdev, buf), dc->disk.disk->disk_name,
+                dc->disk.c->sb.set_uuid);
+        return 0;
+}
+
+void bch_cached_dev_release(struct kobject *kobj)
+{
+        struct cached_dev *dc = container_of(kobj, struct cached_dev,
+                                             disk.kobj);
+        kfree(dc);
+        module_put(THIS_MODULE);
+}
+
+static void cached_dev_free(struct closure *cl)
+{
+        struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl);
+
+        cancel_delayed_work_sync(&dc->writeback_rate_update);
+
+        mutex_lock(&bch_register_lock);
+
+        bcache_device_free(&dc->disk);
+        list_del(&dc->list);
+
+        mutex_unlock(&bch_register_lock);
+
+        if (!IS_ERR_OR_NULL(dc->bdev)) {
+                blk_sync_queue(bdev_get_queue(dc->bdev));
+                blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+        }
+
+        wake_up(&unregister_wait);
+
+        kobject_put(&dc->disk.kobj);
+}
+
+static void cached_dev_flush(struct closure *cl)
+{
+        struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl);
+        struct bcache_device *d = &dc->disk;
+
+        bch_cache_accounting_destroy(&dc->accounting);
+        kobject_del(&d->kobj);
+
+        continue_at(cl, cached_dev_free, system_wq);
+}
+
+static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
+{
+        int err;
+        struct io *io;
+
+        closure_init(&dc->disk.cl, NULL);
+        set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq);
+
+        __module_get(THIS_MODULE);
+        INIT_LIST_HEAD(&dc->list);
+        kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype);
+
+        bch_cache_accounting_init(&dc->accounting, &dc->disk.cl);
+
+        err = bcache_device_init(&dc->disk, block_size);
+        if (err)
+                goto err;
+
+        spin_lock_init(&dc->io_lock);
+        closure_init_unlocked(&dc->sb_write);
+        INIT_WORK(&dc->detach, cached_dev_detach_finish);
+
+        dc->sequential_merge            = true;
+        dc->sequential_cutoff           = 4 << 20;
+
+        INIT_LIST_HEAD(&dc->io_lru);
+        dc->sb_bio.bi_max_vecs  = 1;
+        dc->sb_bio.bi_io_vec    = dc->sb_bio.bi_inline_vecs;
+
+        for (io = dc->io; io < dc->io + RECENT_IO; io++) {
+                list_add(&io->lru, &dc->io_lru);
+                hlist_add_head(&io->hash, dc->io_hash + RECENT_IO);
+        }
+
+        bch_writeback_init_cached_dev(dc);
+        return 0;
+err:
+        bcache_device_stop(&dc->disk);
+        return err;
+}
+
+/* Cached device - bcache superblock */
+
+static const char *register_bdev(struct cache_sb *sb, struct page *sb_page,
+                                 struct block_device *bdev,
+                                 struct cached_dev *dc)
+{
+        char name[BDEVNAME_SIZE];
+        const char *err = "cannot allocate memory";
+        struct gendisk *g;
+        struct cache_set *c;
+
+        if (!dc || cached_dev_init(dc, sb->block_size << 9) != 0)
+                return err;
+
+        memcpy(&dc->sb, sb, sizeof(struct cache_sb));
+        dc->sb_bio.bi_io_vec[0].bv_page = sb_page;
+        dc->bdev = bdev;
+        dc->bdev->bd_holder = dc;
+
+        g = dc->disk.disk;
+
+        set_capacity(g, dc->bdev->bd_part->nr_sects - 16);
+
+        bch_cached_dev_request_init(dc);
+
+        err = "error creating kobject";
+        if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj,
+                        "bcache"))
+                goto err;
+        if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj))
+                goto err;
+
+        list_add(&dc->list, &uncached_devices);
+        list_for_each_entry(c, &bch_cache_sets, list)
+                bch_cached_dev_attach(dc, c);
+
+        if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE ||
+            BDEV_STATE(&dc->sb) == BDEV_STATE_STALE)
+                bch_cached_dev_run(dc);
+
+        return NULL;
+err:
+        kobject_put(&dc->disk.kobj);
+        pr_notice("error opening %s: %s", bdevname(bdev, name), err);
+        /*
+         * Return NULL instead of an error because kobject_put() cleans
+         * everything up
+         */
+        return NULL;
+}
+
+/* Flash only volumes */
+
+void bch_flash_dev_release(struct kobject *kobj)
+{
+        struct bcache_device *d = container_of(kobj, struct bcache_device,
+                                               kobj);
+        kfree(d);
+}
+
+static void flash_dev_free(struct closure *cl)
+{
+        struct bcache_device *d = container_of(cl, struct bcache_device, cl);
+        bcache_device_free(d);
+        kobject_put(&d->kobj);
+}
+
+static void flash_dev_flush(struct closure *cl)
+{
+        struct bcache_device *d = container_of(cl, struct bcache_device, cl);
+
+        sysfs_remove_link(&d->c->kobj, d->name);
+        sysfs_remove_link(&d->kobj, "cache");
+        kobject_del(&d->kobj);
+        continue_at(cl, flash_dev_free, system_wq);
+}
+
+static int flash_dev_run(struct cache_set *c, struct uuid_entry *u)
+{
+        struct bcache_device *d = kzalloc(sizeof(struct bcache_device),
+                                          GFP_KERNEL);
+        if (!d)
+                return -ENOMEM;
+
+        closure_init(&d->cl, NULL);
+        set_closure_fn(&d->cl, flash_dev_flush, system_wq);
+
+        kobject_init(&d->kobj, &bch_flash_dev_ktype);
+
+        if (bcache_device_init(d, block_bytes(c)))
+                goto err;
+
+        bcache_device_attach(d, c, u - c->uuids);
+        set_capacity(d->disk, u->sectors);
+        bch_flash_dev_request_init(d);
+        add_disk(d->disk);
+
+        if (kobject_add(&d->kobj, &disk_to_dev(d->disk)->kobj, "bcache"))
+                goto err;
+
+        bcache_device_link(d, c, "volume");
+
+        return 0;
+err:
+        kobject_put(&d->kobj);
+        return -ENOMEM;
+}
+
+static int flash_devs_run(struct cache_set *c)
+{
+        int ret = 0;
+        struct uuid_entry *u;
+
+        for (u = c->uuids;
+             u < c->uuids + c->nr_uuids && !ret;
+             u++)
+                if (UUID_FLASH_ONLY(u))
+                        ret = flash_dev_run(c, u);
+
+        return ret;
+}
+
+int bch_flash_dev_create(struct cache_set *c, uint64_t size)
+{
+        struct uuid_entry *u;
+
+        if (test_bit(CACHE_SET_STOPPING, &c->flags))
+                return -EINTR;
+
+        u = uuid_find_empty(c);
+        if (!u) {
+                pr_err("Can't create volume, no room for UUID");
+                return -EINVAL;
+        }
+
+        get_random_bytes(u->uuid, 16);
+        memset(u->label, 0, 32);
+        u->first_reg = u->last_reg = cpu_to_le32(get_seconds());
+
+        SET_UUID_FLASH_ONLY(u, 1);
+        u->sectors = size >> 9;
+
+        bch_uuid_write(c);
+
+        return flash_dev_run(c, u);
+}
+
+/* Cache set */
+
+__printf(2, 3)
+bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
+{
+        va_list args;
+
+        if (test_bit(CACHE_SET_STOPPING, &c->flags))
+                return false;
+
+        /* XXX: we can be called from atomic context
+        acquire_console_sem();
+        */
+
+        printk(KERN_ERR "bcache: error on %pU: ", c->sb.set_uuid);
+
+        va_start(args, fmt);
+        vprintk(fmt, args);
+        va_end(args);
+
+        printk(", disabling caching\n");
+
+        bch_cache_set_unregister(c);
+        return true;
+}
+
+void bch_cache_set_release(struct kobject *kobj)
+{
+        struct cache_set *c = container_of(kobj, struct cache_set, kobj);
+        kfree(c);
+        module_put(THIS_MODULE);
+}
+
+static void cache_set_free(struct closure *cl)
+{
+        struct cache_set *c = container_of(cl, struct cache_set, cl);
+        struct cache *ca;
+        unsigned i;
+
+        if (!IS_ERR_OR_NULL(c->debug))
+                debugfs_remove(c->debug);
+
+        bch_open_buckets_free(c);
+        bch_btree_cache_free(c);
+        bch_journal_free(c);
+
+        for_each_cache(ca, c, i)
+                if (ca)
+                        kobject_put(&ca->kobj);
+
+        free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c)));
+        free_pages((unsigned long) c->sort, ilog2(bucket_pages(c)));
+
+        kfree(c->fill_iter);
+        if (c->bio_split)
+                bioset_free(c->bio_split);
+        if (c->bio_meta)
+                mempool_destroy(c->bio_meta);
+        if (c->search)
+                mempool_destroy(c->search);
+        kfree(c->devices);
+
+        mutex_lock(&bch_register_lock);
+        list_del(&c->list);
+        mutex_unlock(&bch_register_lock);
+
+        pr_info("Cache set %pU unregistered", c->sb.set_uuid);
+        wake_up(&unregister_wait);
+
+        closure_debug_destroy(&c->cl);
+        kobject_put(&c->kobj);
+}
+
+static void cache_set_flush(struct closure *cl)
+{
+        struct cache_set *c = container_of(cl, struct cache_set, caching);
+        struct btree *b;
+
+        /* Shut down allocator threads */
+        set_bit(CACHE_SET_STOPPING_2, &c->flags);
+        wake_up(&c->alloc_wait);
+
+        bch_cache_accounting_destroy(&c->accounting);
+
+        kobject_put(&c->internal);
+        kobject_del(&c->kobj);
+
+        if (!IS_ERR_OR_NULL(c->root))
+                list_add(&c->root->list, &c->btree_cache);
+
+        /* Should skip this if we're unregistering because of an error */
+        list_for_each_entry(b, &c->btree_cache, list)
+                if (btree_node_dirty(b))
+                        bch_btree_write(b, true, NULL);
+
+        closure_return(cl);
+}
+
+static void __cache_set_unregister(struct closure *cl)
+{
+        struct cache_set *c = container_of(cl, struct cache_set, caching);
+        struct cached_dev *dc, *t;
+        size_t i;
+
+        mutex_lock(&bch_register_lock);
+
+        if (test_bit(CACHE_SET_UNREGISTERING, &c->flags))
+                list_for_each_entry_safe(dc, t, &c->cached_devs, list)
+                        bch_cached_dev_detach(dc);
+
+        for (i = 0; i < c->nr_uuids; i++)
+                if (c->devices[i] && UUID_FLASH_ONLY(&c->uuids[i]))
+                        bcache_device_stop(c->devices[i]);
+
+        mutex_unlock(&bch_register_lock);
+
+        continue_at(cl, cache_set_flush, system_wq);
+}
+
+void bch_cache_set_stop(struct cache_set *c)
+{
+        if (!test_and_set_bit(CACHE_SET_STOPPING, &c->flags))
+                closure_queue(&c->caching);
+}
+
+void bch_cache_set_unregister(struct cache_set *c)
+{
+        set_bit(CACHE_SET_UNREGISTERING, &c->flags);
+        bch_cache_set_stop(c);
+}
+
+#define alloc_bucket_pages(gfp, c)                      \
+        ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c))))
+
+struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
+{
+        int iter_size;
+        struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL);
+        if (!c)
+                return NULL;
+
+        __module_get(THIS_MODULE);
+        closure_init(&c->cl, NULL);
+        set_closure_fn(&c->cl, cache_set_free, system_wq);
+
+        closure_init(&c->caching, &c->cl);
+        set_closure_fn(&c->caching, __cache_set_unregister, system_wq);
+
+        /* Maybe create continue_at_noreturn() and use it here? */
+        closure_set_stopped(&c->cl);
+        closure_put(&c->cl);
+
+        kobject_init(&c->kobj, &bch_cache_set_ktype);
+        kobject_init(&c->internal, &bch_cache_set_internal_ktype);
+
+        bch_cache_accounting_init(&c->accounting, &c->cl);
+
+        memcpy(c->sb.set_uuid, sb->set_uuid, 16);
+        c->sb.block_size        = sb->block_size;
+        c->sb.bucket_size       = sb->bucket_size;
+        c->sb.nr_in_set         = sb->nr_in_set;
+        c->sb.last_mount        = sb->last_mount;
+        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->btree_pages          = c->sb.bucket_size / PAGE_SECTORS;
+        if (c->btree_pages > BTREE_MAX_PAGES)
+                c->btree_pages = max_t(int, c->btree_pages / 4,
+                                       BTREE_MAX_PAGES);
+
+        init_waitqueue_head(&c->alloc_wait);
+        mutex_init(&c->bucket_lock);
+        mutex_init(&c->fill_lock);
+        mutex_init(&c->sort_lock);
+        spin_lock_init(&c->sort_time_lock);
+        closure_init_unlocked(&c->sb_write);
+        closure_init_unlocked(&c->uuid_write);
+        spin_lock_init(&c->btree_read_time_lock);
+        bch_moving_init_cache_set(c);
+
+        INIT_LIST_HEAD(&c->list);
+        INIT_LIST_HEAD(&c->cached_devs);
+        INIT_LIST_HEAD(&c->btree_cache);
+        INIT_LIST_HEAD(&c->btree_cache_freeable);
+        INIT_LIST_HEAD(&c->btree_cache_freed);
+        INIT_LIST_HEAD(&c->data_buckets);
+
+        c->search = mempool_create_slab_pool(32, bch_search_cache);
+        if (!c->search)
+                goto err;
+
+        iter_size = (sb->bucket_size / sb->block_size + 1) *
+                sizeof(struct btree_iter_set);
+
+        if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) ||
+            !(c->bio_meta = mempool_create_kmalloc_pool(2,
+                                sizeof(struct bbio) + sizeof(struct bio_vec) *
+                                bucket_pages(c))) ||
+            !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
+            !(c->fill_iter = kmalloc(iter_size, GFP_KERNEL)) ||
+            !(c->sort = alloc_bucket_pages(GFP_KERNEL, c)) ||
+            !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) ||
+            bch_journal_alloc(c) ||
+            bch_btree_cache_alloc(c) ||
+            bch_open_buckets_alloc(c))
+                goto err;
+
+        c->fill_iter->size = sb->bucket_size / sb->block_size;
+
+        c->congested_read_threshold_us  = 2000;
+        c->congested_write_threshold_us = 20000;
+        c->error_limit  = 8 << IO_ERROR_SHIFT;
+
+        return c;
+err:
+        bch_cache_set_unregister(c);
+        return NULL;
+}
+
+static void run_cache_set(struct cache_set *c)
+{
+        const char *err = "cannot allocate memory";
+        struct cached_dev *dc, *t;
+        struct cache *ca;
+        unsigned i;
+
+        struct btree_op op;
+        bch_btree_op_init_stack(&op);
+        op.lock = SHRT_MAX;
+
+        for_each_cache(ca, c, i)
+                c->nbuckets += ca->sb.nbuckets;
+
+        if (CACHE_SYNC(&c->sb)) {
+                LIST_HEAD(journal);
+                struct bkey *k;
+                struct jset *j;
+
+                err = "cannot allocate memory for journal";
+                if (bch_journal_read(c, &journal, &op))
+                        goto err;
+
+                pr_debug("btree_journal_read() done");
+
+                err = "no journal entries found";
+                if (list_empty(&journal))
+                        goto err;
+
+                j = &list_entry(journal.prev, struct journal_replay, list)->j;
+
+                err = "IO error reading priorities";
+                for_each_cache(ca, c, i)
+                        prio_read(ca, j->prio_bucket[ca->sb.nr_this_dev]);
+
+                /*
+                 * If prio_read() fails it'll call cache_set_error and we'll
+                 * tear everything down right away, but if we perhaps checked
+                 * sooner we could avoid journal replay.
+                 */
+
+                k = &j->btree_root;
+
+                err = "bad btree root";
+                if (__bch_ptr_invalid(c, j->btree_level + 1, k))
+                        goto err;
+
+                err = "error reading btree root";
+                c->root = bch_btree_node_get(c, k, j->btree_level, &op);
+                if (IS_ERR_OR_NULL(c->root))
+                        goto err;
+
+                list_del_init(&c->root->list);
+                rw_unlock(true, c->root);
+
+                err = uuid_read(c, j, &op.cl);
+                if (err)
+                        goto err;
+
+                err = "error in recovery";
+                if (bch_btree_check(c, &op))
+                        goto err;
+
+                bch_journal_mark(c, &journal);
+                bch_btree_gc_finish(c);
+                pr_debug("btree_check() done");
+
+                /*
+                 * bcache_journal_next() can't happen sooner, or
+                 * btree_gc_finish() will give spurious errors about last_gc >
+                 * gc_gen - this is a hack but oh well.
+                 */
+                bch_journal_next(&c->journal);
+
+                for_each_cache(ca, c, i)
+                        closure_call(&ca->alloc, bch_allocator_thread,
+                                     system_wq, &c->cl);
+
+                /*
+                 * First place it's safe to allocate: btree_check() and
+                 * btree_gc_finish() have to run before we have buckets to
+                 * allocate, and bch_bucket_alloc_set() might cause a journal
+                 * entry to be written so bcache_journal_next() has to be called
+                 * first.
+                 *
+                 * If the uuids were in the old format we have to rewrite them
+                 * before the next journal entry is written:
+                 */
+                if (j->version < BCACHE_JSET_VERSION_UUID)
+                        __uuid_write(c);
+
+                bch_journal_replay(c, &journal, &op);
+        } else {
+                pr_notice("invalidating existing data");
+                /* Don't want invalidate_buckets() to queue a gc yet */
+                closure_lock(&c->gc, NULL);
+
+                for_each_cache(ca, c, i) {
+                        unsigned j;
+
+                        ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
+                                              2, SB_JOURNAL_BUCKETS);
+
+                        for (j = 0; j < ca->sb.keys; j++)
+                                ca->sb.d[j] = ca->sb.first_bucket + j;
+                }
+
+                bch_btree_gc_finish(c);
+
+                for_each_cache(ca, c, i)
+                        closure_call(&ca->alloc, bch_allocator_thread,
+                                     ca->alloc_workqueue, &c->cl);
+
+                mutex_lock(&c->bucket_lock);
+                for_each_cache(ca, c, i)
+                        bch_prio_write(ca);
+                mutex_unlock(&c->bucket_lock);
+
+                wake_up(&c->alloc_wait);
+
+                err = "cannot allocate new UUID bucket";
+                if (__uuid_write(c))
+                        goto err_unlock_gc;
+
+                err = "cannot allocate new btree root";
+                c->root = bch_btree_node_alloc(c, 0, &op.cl);
+                if (IS_ERR_OR_NULL(c->root))
+                        goto err_unlock_gc;
+
+                bkey_copy_key(&c->root->key, &MAX_KEY);
+                bch_btree_write(c->root, true, &op);
+
+                bch_btree_set_root(c->root);
+                rw_unlock(true, c->root);
+
+                /*
+                 * We don't want to write the first journal entry until
+                 * everything is set up - fortunately journal entries won't be
+                 * written until the SET_CACHE_SYNC() here:
+                 */
+                SET_CACHE_SYNC(&c->sb, true);
+
+                bch_journal_next(&c->journal);
+                bch_journal_meta(c, &op.cl);
+
+                /* Unlock */
+                closure_set_stopped(&c->gc.cl);
+                closure_put(&c->gc.cl);
+        }
+
+        closure_sync(&op.cl);
+        c->sb.last_mount = get_seconds();
+        bcache_write_super(c);
+
+        list_for_each_entry_safe(dc, t, &uncached_devices, list)
+                bch_cached_dev_attach(dc, c);
+
+        flash_devs_run(c);
+
+        return;
+err_unlock_gc:
+        closure_set_stopped(&c->gc.cl);
+        closure_put(&c->gc.cl);
+err:
+        closure_sync(&op.cl);
+        /* XXX: test this, it's broken */
+        bch_cache_set_error(c, err);
+}
+
+static bool can_attach_cache(struct cache *ca, struct cache_set *c)
+{
+        return ca->sb.block_size        == c->sb.block_size &&
+                ca->sb.bucket_size      == c->sb.block_size &&
+                ca->sb.nr_in_set        == c->sb.nr_in_set;
+}
+
+static const char *register_cache_set(struct cache *ca)
+{
+        char buf[12];
+        const char *err = "cannot allocate memory";
+        struct cache_set *c;
+
+        list_for_each_entry(c, &bch_cache_sets, list)
+                if (!memcmp(c->sb.set_uuid, ca->sb.set_uuid, 16)) {
+                        if (c->cache[ca->sb.nr_this_dev])
+                                return "duplicate cache set member";
+
+                        if (!can_attach_cache(ca, c))
+                                return "cache sb does not match set";
+
+                        if (!CACHE_SYNC(&ca->sb))
+                                SET_CACHE_SYNC(&c->sb, false);
+
+                        goto found;
+                }
+
+        c = bch_cache_set_alloc(&ca->sb);
+        if (!c)
+                return err;
+
+        err = "error creating kobject";
+        if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) ||
+            kobject_add(&c->internal, &c->kobj, "internal"))
+                goto err;
+
+        if (bch_cache_accounting_add_kobjs(&c->accounting, &c->kobj))
+                goto err;
+
+        bch_debug_init_cache_set(c);
+
+        list_add(&c->list, &bch_cache_sets);
+found:
+        sprintf(buf, "cache%i", ca->sb.nr_this_dev);
+        if (sysfs_create_link(&ca->kobj, &c->kobj, "set") ||
+            sysfs_create_link(&c->kobj, &ca->kobj, buf))
+                goto err;
+
+        if (ca->sb.seq > c->sb.seq) {
+                c->sb.version           = ca->sb.version;
+                memcpy(c->sb.set_uuid, ca->sb.set_uuid, 16);
+                c->sb.flags             = ca->sb.flags;
+                c->sb.seq               = ca->sb.seq;
+                pr_debug("set version = %llu", c->sb.version);
+        }
+
+        ca->set = c;
+        ca->set->cache[ca->sb.nr_this_dev] = ca;
+        c->cache_by_alloc[c->caches_loaded++] = ca;
+
+        if (c->caches_loaded == c->sb.nr_in_set)
+                run_cache_set(c);
+
+        return NULL;
+err:
+        bch_cache_set_unregister(c);
+        return err;
+}
+
+/* Cache device */
+
+void bch_cache_release(struct kobject *kobj)
+{
+        struct cache *ca = container_of(kobj, struct cache, kobj);
+
+        if (ca->set)
+                ca->set->cache[ca->sb.nr_this_dev] = NULL;
+
+        bch_cache_allocator_exit(ca);
+
+        bio_split_pool_free(&ca->bio_split_hook);
+
+        if (ca->alloc_workqueue)
+                destroy_workqueue(ca->alloc_workqueue);
+
+        free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
+        kfree(ca->prio_buckets);
+        vfree(ca->buckets);
+
+        free_heap(&ca->heap);
+        free_fifo(&ca->unused);
+        free_fifo(&ca->free_inc);
+        free_fifo(&ca->free);
+
+        if (ca->sb_bio.bi_inline_vecs[0].bv_page)
+                put_page(ca->sb_bio.bi_io_vec[0].bv_page);
+
+        if (!IS_ERR_OR_NULL(ca->bdev)) {
+                blk_sync_queue(bdev_get_queue(ca->bdev));
+                blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+        }
+
+        kfree(ca);
+        module_put(THIS_MODULE);
+}
+
+static int cache_alloc(struct cache_sb *sb, struct cache *ca)
+{
+        size_t free;
+        struct bucket *b;
+
+        if (!ca)
+                return -ENOMEM;
+
+        __module_get(THIS_MODULE);
+        kobject_init(&ca->kobj, &bch_cache_ktype);
+
+        memcpy(&ca->sb, sb, sizeof(struct cache_sb));
+
+        INIT_LIST_HEAD(&ca->discards);
+
+        bio_init(&ca->sb_bio);
+        ca->sb_bio.bi_max_vecs  = 1;
+        ca->sb_bio.bi_io_vec    = ca->sb_bio.bi_inline_vecs;
+
+        bio_init(&ca->journal.bio);
+        ca->journal.bio.bi_max_vecs = 8;
+        ca->journal.bio.bi_io_vec = ca->journal.bio.bi_inline_vecs;
+
+        free = roundup_pow_of_two(ca->sb.nbuckets) >> 9;
+        free = max_t(size_t, free, (prio_buckets(ca) + 8) * 2);
+
+        if (!init_fifo(&ca->free,       free, GFP_KERNEL) ||
+            !init_fifo(&ca->free_inc,   free << 2, GFP_KERNEL) ||
+            !init_fifo(&ca->unused,     free << 2, GFP_KERNEL) ||
+            !init_heap(&ca->heap,       free << 3, GFP_KERNEL) ||
+            !(ca->buckets       = vmalloc(sizeof(struct bucket) *
+                                          ca->sb.nbuckets)) ||
+            !(ca->prio_buckets  = kzalloc(sizeof(uint64_t) * prio_buckets(ca) *
+                                          2, GFP_KERNEL)) ||
+            !(ca->disk_buckets  = alloc_bucket_pages(GFP_KERNEL, ca)) ||
+            !(ca->alloc_workqueue = alloc_workqueue("bch_allocator", 0, 1)) ||
+            bio_split_pool_init(&ca->bio_split_hook))
+                goto err;
+
+        ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
+
+        memset(ca->buckets, 0, ca->sb.nbuckets * sizeof(struct bucket));
+        for_each_bucket(b, ca)
+                atomic_set(&b->pin, 0);
+
+        if (bch_cache_allocator_init(ca))
+                goto err;
+
+        return 0;
+err:
+        kobject_put(&ca->kobj);
+        return -ENOMEM;
+}
+
+static const char *register_cache(struct cache_sb *sb, struct page *sb_page,
+                                  struct block_device *bdev, struct cache *ca)
+{
+        char name[BDEVNAME_SIZE];
+        const char *err = "cannot allocate memory";
+
+        if (cache_alloc(sb, ca) != 0)
+                return err;
+
+        ca->sb_bio.bi_io_vec[0].bv_page = sb_page;
+        ca->bdev = bdev;
+        ca->bdev->bd_holder = ca;
+
+        if (blk_queue_discard(bdev_get_queue(ca->bdev)))
+                ca->discard = CACHE_DISCARD(&ca->sb);
+
+        err = "error creating kobject";
+        if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache"))
+                goto err;
+
+        err = register_cache_set(ca);
+        if (err)
+                goto err;
+
+        pr_info("registered cache device %s", bdevname(bdev, name));
+
+        return NULL;
+err:
+        kobject_put(&ca->kobj);
+        pr_info("error opening %s: %s", bdevname(bdev, name), err);
+        /* Return NULL instead of an error because kobject_put() cleans
+         * everything up
+         */
+        return NULL;
+}
+
+/* Global interfaces/init */
+
+static ssize_t register_bcache(struct kobject *, struct kobj_attribute *,
+                               const char *, size_t);
+
+kobj_attribute_write(register,          register_bcache);
+kobj_attribute_write(register_quiet,    register_bcache);
+
+static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
+                               const char *buffer, size_t size)
+{
+        ssize_t ret = size;
+        const char *err = "cannot allocate memory";
+        char *path = NULL;
+        struct cache_sb *sb = NULL;
+        struct block_device *bdev = NULL;
+        struct page *sb_page = NULL;
+
+        if (!try_module_get(THIS_MODULE))
+                return -EBUSY;
+
+        mutex_lock(&bch_register_lock);
+
+        if (!(path = kstrndup(buffer, size, GFP_KERNEL)) ||
+            !(sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL)))
+                goto err;
+
+        err = "failed to open device";
+        bdev = blkdev_get_by_path(strim(path),
+                                  FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+                                  sb);
+        if (bdev == ERR_PTR(-EBUSY))
+                err = "device busy";
+
+        if (IS_ERR(bdev) ||
+            set_blocksize(bdev, 4096))
+                goto err;
+
+        err = read_super(sb, bdev, &sb_page);
+        if (err)
+                goto err_close;
+
+        if (sb->version == CACHE_BACKING_DEV) {
+                struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);
+
+                err = register_bdev(sb, sb_page, bdev, dc);
+        } else {
+                struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
+
+                err = register_cache(sb, sb_page, bdev, ca);
+        }
+
+        if (err) {
+                /* register_(bdev|cache) will only return an error if they
+                 * didn't get far enough to create the kobject - if they did,
+                 * the kobject destructor will do this cleanup.
+                 */
+                put_page(sb_page);
+err_close:
+                blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+err:
+                if (attr != &ksysfs_register_quiet)
+                        pr_info("error opening %s: %s", path, err);
+                ret = -EINVAL;
+        }
+
+        kfree(sb);
+        kfree(path);
+        mutex_unlock(&bch_register_lock);
+        module_put(THIS_MODULE);
+        return ret;
+}
+
+static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x)
+{
+        if (code == SYS_DOWN ||
+            code == SYS_HALT ||
+            code == SYS_POWER_OFF) {
+                DEFINE_WAIT(wait);
+                unsigned long start = jiffies;
+                bool stopped = false;
+
+                struct cache_set *c, *tc;
+                struct cached_dev *dc, *tdc;
+
+                mutex_lock(&bch_register_lock);
+
+                if (list_empty(&bch_cache_sets) &&
+                    list_empty(&uncached_devices))
+                        goto out;
+
+                pr_info("Stopping all devices:");
+
+                list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
+                        bch_cache_set_stop(c);
+
+                list_for_each_entry_safe(dc, tdc, &uncached_devices, list)
+                        bcache_device_stop(&dc->disk);
+
+                /* What's a condition variable? */
+                while (1) {
+                        long timeout = start + 2 * HZ - jiffies;
+
+                        stopped = list_empty(&bch_cache_sets) &&
+                                list_empty(&uncached_devices);
+
+                        if (timeout < 0 || stopped)
+                                break;
+
+                        prepare_to_wait(&unregister_wait, &wait,
+                                        TASK_UNINTERRUPTIBLE);
+
+                        mutex_unlock(&bch_register_lock);
+                        schedule_timeout(timeout);
+                        mutex_lock(&bch_register_lock);
+                }
+
+                finish_wait(&unregister_wait, &wait);
+
+                if (stopped)
+                        pr_info("All devices stopped");
+                else
+                        pr_notice("Timeout waiting for devices to be closed");
+out:
+                mutex_unlock(&bch_register_lock);
+        }
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block reboot = {
+        .notifier_call  = bcache_reboot,
+        .priority       = INT_MAX, /* before any real devices */
+};
+
+static void bcache_exit(void)
+{
+        bch_debug_exit();
+        bch_writeback_exit();
+        bch_request_exit();
+        bch_btree_exit();
+        if (bcache_kobj)
+                kobject_put(bcache_kobj);
+        if (bcache_wq)
+                destroy_workqueue(bcache_wq);
+        unregister_blkdev(bcache_major, "bcache");
+        unregister_reboot_notifier(&reboot);
+}
+
+static int __init bcache_init(void)
+{
+        static const struct attribute *files[] = {
+                &ksysfs_register.attr,
+                &ksysfs_register_quiet.attr,
+                NULL
+        };
+
+        mutex_init(&bch_register_lock);
+        init_waitqueue_head(&unregister_wait);
+        register_reboot_notifier(&reboot);
+
+        bcache_major = register_blkdev(0, "bcache");
+        if (bcache_major < 0)
+                return bcache_major;
+
+        if (!(bcache_wq = create_workqueue("bcache")) ||
+            !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||
+            sysfs_create_files(bcache_kobj, files) ||
+            bch_btree_init() ||
+            bch_request_init() ||
+            bch_writeback_init() ||
+            bch_debug_init(bcache_kobj))
+                goto err;
+
+        return 0;
+err:
+        bcache_exit();
+        return -ENOMEM;
+}
+
+module_exit(bcache_exit);
+module_init(bcache_init);