From a36159eec6ca17402b0e146b86efaf76568dc353 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 20 Sep 2024 01:41:23 +0000
Subject: [PATCH] 重命名 AX88772C_eeprom/asix.c 为 asix_mac.c
---
kernel/drivers/md/bcache/super.c | 1298 +++++++++++++++++++++++++++++++++++++++++-----------------
1 files changed, 909 insertions(+), 389 deletions(-)
diff --git a/kernel/drivers/md/bcache/super.c b/kernel/drivers/md/bcache/super.c
index 2df75db..e8c8077 100644
--- a/kernel/drivers/md/bcache/super.c
+++ b/kernel/drivers/md/bcache/super.c
@@ -13,20 +13,21 @@
#include "extents.h"
#include "request.h"
#include "writeback.h"
+#include "features.h"
#include <linux/blkdev.h>
-#include <linux/buffer_head.h>
#include <linux/debugfs.h>
#include <linux/genhd.h>
#include <linux/idr.h>
#include <linux/kthread.h>
+#include <linux/workqueue.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>");
+unsigned int bch_cutoff_writeback;
+unsigned int bch_cutoff_writeback_sync;
static const char bcache_magic[] = {
0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
@@ -40,6 +41,7 @@
static struct kobject *bcache_kobj;
struct mutex bch_register_lock;
+bool bcache_is_reboot;
LIST_HEAD(bch_cache_sets);
static LIST_HEAD(uncached_devices);
@@ -47,7 +49,9 @@
static DEFINE_IDA(bcache_device_idx);
static wait_queue_head_t unregister_wait;
struct workqueue_struct *bcache_wq;
+struct workqueue_struct *bch_flush_wq;
struct workqueue_struct *bch_journal_wq;
+
#define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE)
/* limitation of partitions number on single bcache device */
@@ -57,18 +61,121 @@
/* Superblock */
-static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
- struct page **res)
+static unsigned int get_bucket_size(struct cache_sb *sb, struct cache_sb_disk *s)
+{
+ unsigned int bucket_size = le16_to_cpu(s->bucket_size);
+
+ if (sb->version >= BCACHE_SB_VERSION_CDEV_WITH_FEATURES) {
+ if (bch_has_feature_large_bucket(sb)) {
+ unsigned int max, order;
+
+ max = sizeof(unsigned int) * BITS_PER_BYTE - 1;
+ order = le16_to_cpu(s->bucket_size);
+ /*
+ * bcache tool will make sure the overflow won't
+ * happen, an error message here is enough.
+ */
+ if (order > max)
+ pr_err("Bucket size (1 << %u) overflows\n",
+ order);
+ bucket_size = 1 << order;
+ } else if (bch_has_feature_obso_large_bucket(sb)) {
+ bucket_size +=
+ le16_to_cpu(s->obso_bucket_size_hi) << 16;
+ }
+ }
+
+ return bucket_size;
+}
+
+static const char *read_super_common(struct cache_sb *sb, struct block_device *bdev,
+ struct cache_sb_disk *s)
{
const char *err;
- struct cache_sb *s;
- struct buffer_head *bh = __bread(bdev, 1, SB_SIZE);
unsigned int i;
- if (!bh)
- return "IO error";
+ sb->first_bucket= le16_to_cpu(s->first_bucket);
+ sb->nbuckets = le64_to_cpu(s->nbuckets);
+ sb->bucket_size = get_bucket_size(sb, s);
- s = (struct cache_sb *) bh->b_data;
+ sb->nr_in_set = le16_to_cpu(s->nr_in_set);
+ sb->nr_this_dev = le16_to_cpu(s->nr_this_dev);
+
+ err = "Too many journal buckets";
+ if (sb->keys > SB_JOURNAL_BUCKETS)
+ 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 = "Bad block size (not power of 2)";
+ if (!is_power_of_2(sb->block_size))
+ goto err;
+
+ err = "Bad block size (larger than page size)";
+ if (sb->block_size > PAGE_SECTORS)
+ goto err;
+
+ err = "Bad bucket size (not power of 2)";
+ if (!is_power_of_2(sb->bucket_size))
+ goto err;
+
+ err = "Bad bucket size (smaller than page size)";
+ if (sb->bucket_size < PAGE_SECTORS)
+ goto err;
+
+ err = "Invalid superblock: device too small";
+ if (get_capacity(bdev->bd_disk) <
+ sb->bucket_size * sb->nbuckets)
+ goto err;
+
+ err = "Bad UUID";
+ if (bch_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;
+
+ err = NULL;
+err:
+ return err;
+}
+
+
+static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
+ struct cache_sb_disk **res)
+{
+ const char *err;
+ struct cache_sb_disk *s;
+ struct page *page;
+ unsigned int i;
+
+ page = read_cache_page_gfp(bdev->bd_inode->i_mapping,
+ SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL);
+ if (IS_ERR(page))
+ return "IO error";
+ s = page_address(page) + offset_in_page(SB_OFFSET);
sb->offset = le64_to_cpu(s->offset);
sb->version = le64_to_cpu(s->version);
@@ -81,24 +188,20 @@
sb->flags = le64_to_cpu(s->flags);
sb->seq = le64_to_cpu(s->seq);
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",
+ pr_debug("read sb version %llu, flags %llu, seq %llu, journal size %u\n",
sb->version, sb->flags, sb->seq, sb->keys);
- err = "Not a bcache superblock";
+ err = "Not a bcache superblock (bad offset)";
if (sb->offset != SB_SECTOR)
goto err;
+ err = "Not a bcache superblock (bad magic)";
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";
@@ -120,6 +223,7 @@
sb->data_offset = BDEV_DATA_START_DEFAULT;
break;
case BCACHE_SB_VERSION_BDEV_WITH_OFFSET:
+ case BCACHE_SB_VERSION_BDEV_WITH_FEATURES:
sb->data_offset = le64_to_cpu(s->data_offset);
err = "Bad data offset";
@@ -129,55 +233,35 @@
break;
case BCACHE_SB_VERSION_CDEV:
case BCACHE_SB_VERSION_CDEV_WITH_UUID:
- sb->nbuckets = le64_to_cpu(s->nbuckets);
- sb->bucket_size = le16_to_cpu(s->bucket_size);
+ err = read_super_common(sb, bdev, s);
+ if (err)
+ goto err;
+ break;
+ case BCACHE_SB_VERSION_CDEV_WITH_FEATURES:
+ /*
+ * Feature bits are needed in read_super_common(),
+ * convert them firstly.
+ */
+ sb->feature_compat = le64_to_cpu(s->feature_compat);
+ sb->feature_incompat = le64_to_cpu(s->feature_incompat);
+ sb->feature_ro_compat = le64_to_cpu(s->feature_ro_compat);
- sb->nr_in_set = le16_to_cpu(s->nr_in_set);
- sb->nr_this_dev = le16_to_cpu(s->nr_this_dev);
-
- err = "Too many buckets";
- if (sb->nbuckets > LONG_MAX)
+ /* Check incompatible features */
+ err = "Unsupported compatible feature found";
+ if (bch_has_unknown_compat_features(sb))
goto err;
- err = "Not enough buckets";
- if (sb->nbuckets < 1 << 7)
+ err = "Unsupported read-only compatible feature found";
+ if (bch_has_unknown_ro_compat_features(sb))
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)
+ err = "Unsupported incompatible feature found";
+ if (bch_has_unknown_incompat_features(sb))
goto err;
- err = "Invalid superblock: device too small";
- if (get_capacity(bdev->bd_disk) <
- sb->bucket_size * sb->nbuckets)
+ err = read_super_common(sb, bdev, s);
+ if (err)
goto err;
-
- err = "Bad UUID";
- if (bch_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;
-
break;
default:
err = "Unsupported superblock version";
@@ -185,35 +269,34 @@
}
sb->last_mount = (u32)ktime_get_real_seconds();
- err = NULL;
-
- get_page(bh->b_page);
- *res = bh->b_page;
+ *res = s;
+ return NULL;
err:
- put_bh(bh);
+ put_page(page);
return err;
}
static void write_bdev_super_endio(struct bio *bio)
{
struct cached_dev *dc = bio->bi_private;
- /* XXX: error checking */
+
+ if (bio->bi_status)
+ bch_count_backing_io_errors(dc, bio);
closure_put(&dc->sb_write);
}
-static void __write_super(struct cache_sb *sb, struct bio *bio)
+static void __write_super(struct cache_sb *sb, struct cache_sb_disk *out,
+ struct bio *bio)
{
- struct cache_sb *out = page_address(bio_first_page_all(bio));
unsigned int i;
+ bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_META;
bio->bi_iter.bi_sector = SB_SECTOR;
- bio->bi_iter.bi_size = SB_SIZE;
- bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_SYNC|REQ_META);
- bch_bio_map(bio, NULL);
+ __bio_add_page(bio, virt_to_page(out), SB_SIZE,
+ offset_in_page(out));
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);
@@ -229,9 +312,16 @@
for (i = 0; i < sb->keys; i++)
out->d[i] = cpu_to_le64(sb->d[i]);
+ if (sb->version >= BCACHE_SB_VERSION_CDEV_WITH_FEATURES) {
+ out->feature_compat = cpu_to_le64(sb->feature_compat);
+ out->feature_incompat = cpu_to_le64(sb->feature_incompat);
+ out->feature_ro_compat = cpu_to_le64(sb->feature_ro_compat);
+ }
+
+ out->version = cpu_to_le64(sb->version);
out->csum = csum_set(out);
- pr_debug("ver %llu, flags %llu, seq %llu",
+ pr_debug("ver %llu, flags %llu, seq %llu\n",
sb->version, sb->flags, sb->seq);
submit_bio(bio);
@@ -252,14 +342,14 @@
down(&dc->sb_write_mutex);
closure_init(cl, parent);
- bio_reset(bio);
+ bio_init(bio, dc->sb_bv, 1);
bio_set_dev(bio, dc->bdev);
bio->bi_end_io = write_bdev_super_endio;
bio->bi_private = dc;
closure_get(cl);
/* I/O request sent to backing device */
- __write_super(&dc->sb, bio);
+ __write_super(&dc->sb, dc->sb_disk, bio);
closure_return_with_destructor(cl, bch_write_bdev_super_unlock);
}
@@ -284,31 +374,25 @@
void bcache_write_super(struct cache_set *c)
{
struct closure *cl = &c->sb_write;
- struct cache *ca;
- unsigned int i;
+ struct cache *ca = c->cache;
+ struct bio *bio = &ca->sb_bio;
+ unsigned int version = BCACHE_SB_VERSION_CDEV_WITH_UUID;
down(&c->sb_write_mutex);
closure_init(cl, &c->cl);
- c->sb.seq++;
+ ca->sb.seq++;
- for_each_cache(ca, c, i) {
- struct bio *bio = &ca->sb_bio;
+ if (ca->sb.version < version)
+ ca->sb.version = version;
- ca->sb.version = BCACHE_SB_VERSION_CDEV_WITH_UUID;
- ca->sb.seq = c->sb.seq;
- ca->sb.last_mount = c->sb.last_mount;
+ bio_init(bio, ca->sb_bv, 1);
+ bio_set_dev(bio, ca->bdev);
+ bio->bi_end_io = write_super_endio;
+ bio->bi_private = ca;
- SET_CACHE_SYNC(&ca->sb, CACHE_SYNC(&c->sb));
-
- bio_reset(bio);
- bio_set_dev(bio, ca->bdev);
- bio->bi_end_io = write_super_endio;
- bio->bi_private = ca;
-
- closure_get(cl);
- __write_super(&ca->sb, bio);
- }
+ closure_get(cl);
+ __write_super(&ca->sb, ca->sb_disk, bio);
closure_return_with_destructor(cl, bcache_write_super_unlock);
}
@@ -362,11 +446,11 @@
}
bch_extent_to_text(buf, sizeof(buf), k);
- pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf);
+ pr_debug("%s UUIDs at %s\n", op == REQ_OP_WRITE ? "wrote" : "read", buf);
for (u = c->uuids; u < c->uuids + c->nr_uuids; u++)
if (!bch_is_zero(u->uuid, 16))
- pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u",
+ pr_debug("Slot %zi: %pU: %s: 1st: %u last: %u inv: %u\n",
u - c->uuids, u->uuid, u->label,
u->first_reg, u->last_reg, u->invalidated);
@@ -418,20 +502,21 @@
{
BKEY_PADDED(key) k;
struct closure cl;
- struct cache *ca;
+ struct cache *ca = c->cache;
+ unsigned int size;
closure_init_stack(&cl);
lockdep_assert_held(&bch_register_lock);
- if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, true))
+ if (bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, true))
return 1;
- SET_KEY_SIZE(&k.key, c->sb.bucket_size);
+ size = meta_bucket_pages(&ca->sb) * PAGE_SECTORS;
+ SET_KEY_SIZE(&k.key, size);
uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl);
closure_sync(&cl);
/* Only one bucket used for uuid write */
- ca = PTR_CACHE(c, &k.key, 0);
atomic_long_add(ca->sb.bucket_size, &ca->meta_sectors_written);
bkey_copy(&c->uuid_bucket, &k.key);
@@ -514,7 +599,7 @@
bio->bi_iter.bi_sector = bucket * ca->sb.bucket_size;
bio_set_dev(bio, ca->bdev);
- bio->bi_iter.bi_size = bucket_bytes(ca);
+ bio->bi_iter.bi_size = meta_bucket_bytes(&ca->sb);
bio->bi_end_io = prio_endio;
bio->bi_private = ca;
@@ -531,7 +616,7 @@
struct bucket *b;
struct closure cl;
- pr_debug("free_prio=%zu, free_none=%zu, free_inc=%zu",
+ pr_debug("free_prio=%zu, free_none=%zu, free_inc=%zu\n",
fifo_used(&ca->free[RESERVE_PRIO]),
fifo_used(&ca->free[RESERVE_NONE]),
fifo_used(&ca->free_inc));
@@ -572,7 +657,7 @@
p->next_bucket = ca->prio_buckets[i + 1];
p->magic = pset_magic(&ca->sb);
- p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8);
+ p->csum = bch_crc64(&p->magic, meta_bucket_bytes(&ca->sb) - 8);
bucket = bch_bucket_alloc(ca, RESERVE_PRIO, wait);
BUG_ON(bucket == -1);
@@ -606,12 +691,13 @@
return 0;
}
-static void prio_read(struct cache *ca, uint64_t bucket)
+static int 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 int bucket_nr = 0;
+ int ret = -EIO;
for (b = ca->buckets;
b < ca->buckets + ca->sb.nbuckets;
@@ -624,11 +710,15 @@
prio_io(ca, bucket, REQ_OP_READ, 0);
if (p->csum !=
- bch_crc64(&p->magic, bucket_bytes(ca) - 8))
- pr_warn("bad csum reading priorities");
+ bch_crc64(&p->magic, meta_bucket_bytes(&ca->sb) - 8)) {
+ pr_warn("bad csum reading priorities\n");
+ goto out;
+ }
- if (p->magic != pset_magic(&ca->sb))
- pr_warn("bad magic reading priorities");
+ if (p->magic != pset_magic(&ca->sb)) {
+ pr_warn("bad magic reading priorities\n");
+ goto out;
+ }
bucket = p->next_bucket;
d = p->data;
@@ -637,6 +727,10 @@
b->prio = le16_to_cpu(d->prio);
b->gen = b->last_gc = d->gen;
}
+
+ ret = 0;
+out:
+ return ret;
}
/* Bcache device */
@@ -667,7 +761,16 @@
return d->ioctl(d, mode, cmd, arg);
}
-static const struct block_device_operations bcache_ops = {
+static const struct block_device_operations bcache_cached_ops = {
+ .submit_bio = cached_dev_submit_bio,
+ .open = open_dev,
+ .release = release_dev,
+ .ioctl = ioctl_dev,
+ .owner = THIS_MODULE,
+};
+
+static const struct block_device_operations bcache_flash_ops = {
+ .submit_bio = flash_dev_submit_bio,
.open = open_dev,
.release = release_dev,
.ioctl = ioctl_dev,
@@ -677,6 +780,11 @@
void bcache_device_stop(struct bcache_device *d)
{
if (!test_and_set_bit(BCACHE_DEV_CLOSING, &d->flags))
+ /*
+ * closure_fn set to
+ * - cached device: cached_dev_flush()
+ * - flash dev: flash_dev_flush()
+ */
closure_queue(&d->cl);
}
@@ -685,32 +793,33 @@
lockdep_assert_held(&bch_register_lock);
if (d->c && !test_and_set_bit(BCACHE_DEV_UNLINK_DONE, &d->flags)) {
- unsigned int i;
- struct cache *ca;
+ struct cache *ca = d->c->cache;
sysfs_remove_link(&d->c->kobj, d->name);
sysfs_remove_link(&d->kobj, "cache");
- for_each_cache(ca, d->c, i)
- bd_unlink_disk_holder(ca->bdev, d->disk);
+ bd_unlink_disk_holder(ca->bdev, d->disk);
}
}
static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
const char *name)
{
- unsigned int i;
- struct cache *ca;
+ struct cache *ca = c->cache;
+ int ret;
- for_each_cache(ca, d->c, i)
- bd_link_disk_holder(ca->bdev, d->disk);
+ bd_link_disk_holder(ca->bdev, d->disk);
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");
+ ret = sysfs_create_link(&d->kobj, &c->kobj, "cache");
+ if (ret < 0)
+ pr_err("Couldn't create device -> cache set symlink\n");
+
+ ret = sysfs_create_link(&c->kobj, &d->kobj, d->name);
+ if (ret < 0)
+ pr_err("Couldn't create cache set -> device symlink\n");
clear_bit(BCACHE_DEV_UNLINK_DONE, &d->flags);
}
@@ -767,9 +876,9 @@
lockdep_assert_held(&bch_register_lock);
if (disk)
- pr_info("%s stopped", disk->disk_name);
+ pr_info("%s stopped\n", disk->disk_name);
else
- pr_err("bcache device (NULL gendisk) stopped");
+ pr_err("bcache device (NULL gendisk) stopped\n");
if (d->c)
bcache_device_detach(d);
@@ -797,24 +906,25 @@
}
static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
- sector_t sectors)
+ sector_t sectors, struct block_device *cached_bdev,
+ const struct block_device_operations *ops)
{
struct request_queue *q;
const size_t max_stripes = min_t(size_t, INT_MAX,
SIZE_MAX / sizeof(atomic_t));
- size_t n;
+ uint64_t n;
int idx;
if (!d->stripe_size)
d->stripe_size = 1 << 31;
- d->nr_stripes = DIV_ROUND_UP_ULL(sectors, d->stripe_size);
-
- if (!d->nr_stripes || d->nr_stripes > max_stripes) {
- pr_err("nr_stripes too large or invalid: %u (start sector beyond end of disk?)",
- (unsigned int)d->nr_stripes);
+ n = DIV_ROUND_UP_ULL(sectors, d->stripe_size);
+ if (!n || n > max_stripes) {
+ pr_err("nr_stripes too large or invalid: %llu (start sector beyond end of disk?)\n",
+ n);
return -ENOMEM;
}
+ d->nr_stripes = n;
n = d->nr_stripes * sizeof(atomic_t);
d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL);
@@ -844,17 +954,14 @@
d->disk->major = bcache_major;
d->disk->first_minor = idx_to_first_minor(idx);
- d->disk->fops = &bcache_ops;
+ d->disk->fops = ops;
d->disk->private_data = d;
- q = blk_alloc_queue(GFP_KERNEL);
+ q = blk_alloc_queue(NUMA_NO_NODE);
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;
@@ -864,6 +971,20 @@
q->limits.io_min = block_size;
q->limits.logical_block_size = block_size;
q->limits.physical_block_size = block_size;
+
+ if (q->limits.logical_block_size > PAGE_SIZE && cached_bdev) {
+ /*
+ * This should only happen with BCACHE_SB_VERSION_BDEV.
+ * Block/page size is checked for BCACHE_SB_VERSION_CDEV.
+ */
+ pr_info("%s: sb/logical block size (%u) greater than page size (%lu) falling back to device logical block size (%u)\n",
+ d->disk->disk_name, q->limits.logical_block_size,
+ PAGE_SIZE, bdev_logical_block_size(cached_bdev));
+
+ /* This also adjusts physical block size/min io size if needed */
+ blk_queue_logical_block_size(q, bdev_logical_block_size(cached_bdev));
+ }
+
blk_queue_flag_set(QUEUE_FLAG_NONROT, d->disk->queue);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, d->disk->queue);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, d->disk->queue);
@@ -916,11 +1037,11 @@
dc->offline_seconds = 0;
if (dc->offline_seconds >= BACKING_DEV_OFFLINE_TIMEOUT) {
- pr_err("%s: device offline for %d seconds",
+ pr_err("%s: device offline for %d seconds\n",
dc->backing_dev_name,
BACKING_DEV_OFFLINE_TIMEOUT);
- pr_err("%s: disable I/O request due to backing "
- "device offline", dc->disk.name);
+ pr_err("%s: disable I/O request due to backing device offline\n",
+ dc->disk.name);
dc->io_disable = true;
/* let others know earlier that io_disable is true */
smp_mb();
@@ -935,25 +1056,33 @@
}
-void bch_cached_dev_run(struct cached_dev *dc)
+int bch_cached_dev_run(struct cached_dev *dc)
{
struct bcache_device *d = &dc->disk;
- char buf[SB_LABEL_SIZE + 1];
+ char *buf = kmemdup_nul(dc->sb.label, SB_LABEL_SIZE, GFP_KERNEL);
char *env[] = {
"DRIVER=bcache",
kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
- NULL,
+ kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf ? : ""),
NULL,
};
- memcpy(buf, dc->sb.label, SB_LABEL_SIZE);
- buf[SB_LABEL_SIZE] = '\0';
- env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf);
+ if (dc->io_disable) {
+ pr_err("I/O disabled on cached dev %s\n",
+ dc->backing_dev_name);
+ kfree(env[1]);
+ kfree(env[2]);
+ kfree(buf);
+ return -EIO;
+ }
if (atomic_xchg(&dc->running, 1)) {
kfree(env[1]);
kfree(env[2]);
- return;
+ kfree(buf);
+ pr_info("cached dev %s is running already\n",
+ dc->backing_dev_name);
+ return -EBUSY;
}
if (!d->c &&
@@ -976,18 +1105,22 @@
kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
kfree(env[1]);
kfree(env[2]);
+ kfree(buf);
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");
+ sysfs_create_link(&disk_to_dev(d->disk)->kobj,
+ &d->kobj, "bcache")) {
+ pr_err("Couldn't create bcache dev <-> disk sysfs symlinks\n");
+ return -ENOMEM;
+ }
dc->status_update_thread = kthread_run(cached_dev_status_update,
dc, "bcache_status_update");
if (IS_ERR(dc->status_update_thread)) {
- pr_warn("failed to create bcache_status_update kthread, "
- "continue to run without monitoring backing "
- "device status");
+ pr_warn("failed to create bcache_status_update kthread, continue to run without monitoring backing device status\n");
}
+
+ return 0;
}
/*
@@ -1010,7 +1143,7 @@
} while (time_out > 0);
if (time_out == 0)
- pr_warn("give up waiting for dc->writeback_write_update to quit");
+ pr_warn("give up waiting for dc->writeback_write_update to quit\n");
cancel_delayed_work_sync(&dc->writeback_rate_update);
}
@@ -1025,7 +1158,6 @@
BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
BUG_ON(refcount_read(&dc->count));
- mutex_lock(&bch_register_lock);
if (test_and_clear_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags))
cancel_writeback_rate_update_dwork(dc);
@@ -1041,6 +1173,8 @@
bch_write_bdev_super(dc, &cl);
closure_sync(&cl);
+ mutex_lock(&bch_register_lock);
+
calc_cached_dev_sectors(dc->disk.c);
bcache_device_detach(&dc->disk);
list_move(&dc->list, &uncached_devices);
@@ -1050,7 +1184,7 @@
mutex_unlock(&bch_register_lock);
- pr_info("Caching disabled for %s", dc->backing_dev_name);
+ pr_info("Caching disabled for %s\n", dc->backing_dev_name);
/* Drop ref we took in cached_dev_detach() */
closure_put(&dc->disk.cl);
@@ -1083,26 +1217,27 @@
uint32_t rtime = cpu_to_le32((u32)ktime_get_real_seconds());
struct uuid_entry *u;
struct cached_dev *exist_dc, *t;
+ int ret = 0;
- if ((set_uuid && memcmp(set_uuid, c->sb.set_uuid, 16)) ||
- (!set_uuid && memcmp(dc->sb.set_uuid, c->sb.set_uuid, 16)))
+ if ((set_uuid && memcmp(set_uuid, c->set_uuid, 16)) ||
+ (!set_uuid && memcmp(dc->sb.set_uuid, c->set_uuid, 16)))
return -ENOENT;
if (dc->disk.c) {
- pr_err("Can't attach %s: already attached",
+ pr_err("Can't attach %s: already attached\n",
dc->backing_dev_name);
return -EINVAL;
}
if (test_bit(CACHE_SET_STOPPING, &c->flags)) {
- pr_err("Can't attach %s: shutting down",
+ pr_err("Can't attach %s: shutting down\n",
dc->backing_dev_name);
return -EINVAL;
}
- if (dc->sb.block_size < c->sb.block_size) {
+ if (dc->sb.block_size < c->cache->sb.block_size) {
/* Will die */
- pr_err("Couldn't attach %s: block size less than set's block size",
+ pr_err("Couldn't attach %s: block size less than set's block size\n",
dc->backing_dev_name);
return -EINVAL;
}
@@ -1110,7 +1245,7 @@
/* Check whether already attached */
list_for_each_entry_safe(exist_dc, t, &c->cached_devs, list) {
if (!memcmp(dc->sb.uuid, exist_dc->sb.uuid, 16)) {
- pr_err("Tried to attach %s but duplicate UUID already attached",
+ pr_err("Tried to attach %s but duplicate UUID already attached\n",
dc->backing_dev_name);
return -EINVAL;
@@ -1129,14 +1264,14 @@
if (!u) {
if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
- pr_err("Couldn't find uuid for %s in set",
+ pr_err("Couldn't find uuid for %s in set\n",
dc->backing_dev_name);
return -ENOENT;
}
u = uuid_find_empty(c);
if (!u) {
- pr_err("Not caching %s, no room for UUID",
+ pr_err("Not caching %s, no room for UUID\n",
dc->backing_dev_name);
return -EINVAL;
}
@@ -1157,7 +1292,7 @@
u->first_reg = u->last_reg = rtime;
bch_uuid_write(c);
- memcpy(dc->sb.set_uuid, c->sb.set_uuid, 16);
+ memcpy(dc->sb.set_uuid, c->set_uuid, 16);
SET_BDEV_STATE(&dc->sb, BDEV_STATE_CLEAN);
bch_write_bdev_super(dc, &cl);
@@ -1182,6 +1317,8 @@
down_write(&dc->writeback_lock);
if (bch_cached_dev_writeback_start(dc)) {
up_write(&dc->writeback_lock);
+ pr_err("Couldn't start writeback facilities for %s\n",
+ dc->disk.disk->disk_name);
return -ENOMEM;
}
@@ -1192,20 +1329,42 @@
bch_sectors_dirty_init(&dc->disk);
- bch_cached_dev_run(dc);
+ ret = bch_cached_dev_run(dc);
+ if (ret && (ret != -EBUSY)) {
+ up_write(&dc->writeback_lock);
+ /*
+ * bch_register_lock is held, bcache_device_stop() is not
+ * able to be directly called. The kthread and kworker
+ * created previously in bch_cached_dev_writeback_start()
+ * have to be stopped manually here.
+ */
+ kthread_stop(dc->writeback_thread);
+ cancel_writeback_rate_update_dwork(dc);
+ pr_err("Couldn't run cached device %s\n",
+ dc->backing_dev_name);
+ return ret;
+ }
+
bcache_device_link(&dc->disk, c, "bdev");
atomic_inc(&c->attached_dev_nr);
+
+ if (bch_has_feature_obso_large_bucket(&(c->cache->sb))) {
+ pr_err("The obsoleted large bucket layout is unsupported, set the bcache device into read-only\n");
+ pr_err("Please update to the latest bcache-tools to create the cache device\n");
+ set_disk_ro(dc->disk.disk, 1);
+ }
/* Allow the writeback thread to proceed */
up_write(&dc->writeback_lock);
- pr_info("Caching %s as %s on set %pU",
+ pr_info("Caching %s as %s on set %pU\n",
dc->backing_dev_name,
dc->disk.disk->disk_name,
- dc->disk.c->sb.set_uuid);
+ dc->disk.c->set_uuid);
return 0;
}
+/* when dc->disk.kobj released */
void bch_cached_dev_release(struct kobject *kobj)
{
struct cached_dev *dc = container_of(kobj, struct cached_dev,
@@ -1235,8 +1394,8 @@
mutex_unlock(&bch_register_lock);
- if (dc->sb_bio.bi_inline_vecs[0].bv_page)
- put_page(bio_first_page_all(&dc->sb_bio));
+ if (dc->sb_disk)
+ put_page(virt_to_page(dc->sb_disk));
if (!IS_ERR_OR_NULL(dc->bdev))
blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
@@ -1292,13 +1451,13 @@
q->limits.raid_partial_stripes_expensive;
ret = bcache_device_init(&dc->disk, block_size,
- dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
+ dc->bdev->bd_part->nr_sects - dc->sb.data_offset,
+ dc->bdev, &bcache_cached_ops);
if (ret)
return ret;
- dc->disk.disk->queue->backing_dev_info->ra_pages =
- max(dc->disk.disk->queue->backing_dev_info->ra_pages,
- q->backing_dev_info->ra_pages);
+ blk_queue_io_opt(dc->disk.disk->queue,
+ max(queue_io_opt(dc->disk.disk->queue), queue_io_opt(q)));
atomic_set(&dc->io_errors, 0);
dc->io_disable = false;
@@ -1313,22 +1472,19 @@
/* Cached device - bcache superblock */
-static void register_bdev(struct cache_sb *sb, struct page *sb_page,
+static int register_bdev(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
struct block_device *bdev,
struct cached_dev *dc)
{
const char *err = "cannot allocate memory";
struct cache_set *c;
+ int ret = -ENOMEM;
bdevname(bdev, dc->backing_dev_name);
memcpy(&dc->sb, sb, sizeof(struct cache_sb));
dc->bdev = bdev;
dc->bdev->bd_holder = dc;
-
- bio_init(&dc->sb_bio, dc->sb_bio.bi_inline_vecs, 1);
- bio_first_bvec_all(&dc->sb_bio)->bv_page = sb_page;
- get_page(sb_page);
-
+ dc->sb_disk = sb_disk;
if (cached_dev_init(dc, sb->block_size << 9))
goto err;
@@ -1340,7 +1496,7 @@
if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj))
goto err;
- pr_info("registered backing device %s", dc->backing_dev_name);
+ pr_info("registered backing device %s\n", dc->backing_dev_name);
list_add(&dc->list, &uncached_devices);
/* attach to a matched cache set if it exists */
@@ -1348,17 +1504,23 @@
bch_cached_dev_attach(dc, c, NULL);
if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE ||
- BDEV_STATE(&dc->sb) == BDEV_STATE_STALE)
- bch_cached_dev_run(dc);
+ BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) {
+ err = "failed to run cached device";
+ ret = bch_cached_dev_run(dc);
+ if (ret)
+ goto err;
+ }
- return;
+ return 0;
err:
- pr_notice("error %s: %s", dc->backing_dev_name, err);
+ pr_notice("error %s: %s\n", dc->backing_dev_name, err);
bcache_device_stop(&dc->disk);
+ return ret;
}
/* Flash only volumes */
+/* When d->kobj released */
void bch_flash_dev_release(struct kobject *kobj)
{
struct bcache_device *d = container_of(kobj, struct bcache_device,
@@ -1401,7 +1563,8 @@
kobject_init(&d->kobj, &bch_flash_dev_ktype);
- if (bcache_device_init(d, block_bytes(c), u->sectors))
+ if (bcache_device_init(d, block_bytes(c->cache), u->sectors,
+ NULL, &bcache_flash_ops))
goto err;
bcache_device_attach(d, c, u - c->uuids);
@@ -1413,6 +1576,12 @@
goto err;
bcache_device_link(d, c, "volume");
+
+ if (bch_has_feature_obso_large_bucket(&c->cache->sb)) {
+ pr_err("The obsoleted large bucket layout is unsupported, set the bcache device into read-only\n");
+ pr_err("Please update to the latest bcache-tools to create the cache device\n");
+ set_disk_ro(d->disk, 1);
+ }
return 0;
err:
@@ -1446,7 +1615,7 @@
u = uuid_find_empty(c);
if (!u) {
- pr_err("Can't create volume, no room for UUID");
+ pr_err("Can't create volume, no room for UUID\n");
return -EINVAL;
}
@@ -1472,7 +1641,7 @@
smp_mb();
pr_err("stop %s: too many IO errors on backing device %s\n",
- dc->disk.disk->disk_name, dc->backing_dev_name);
+ dc->disk.disk->disk_name, dc->backing_dev_name);
bcache_device_stop(&dc->disk);
return true;
@@ -1483,6 +1652,7 @@
__printf(2, 3)
bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
{
+ struct va_format vaf;
va_list args;
if (c->on_error != ON_ERROR_PANIC &&
@@ -1490,20 +1660,22 @@
return false;
if (test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags))
- pr_info("CACHE_SET_IO_DISABLE already set");
+ pr_info("CACHE_SET_IO_DISABLE already set\n");
/*
* XXX: we can be called from atomic context
* acquire_console_sem();
*/
- pr_err("bcache: error on %pU: ", c->sb.set_uuid);
-
va_start(args, fmt);
- vprintk(fmt, args);
- va_end(args);
- pr_err(", disabling caching\n");
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ pr_err("error on %pU: %pV, disabling caching\n",
+ c->set_uuid, &vaf);
+
+ va_end(args);
if (c->on_error == ON_ERROR_PANIC)
panic("panic forced after error\n");
@@ -1512,6 +1684,7 @@
return true;
}
+/* When c->kobj released */
void bch_cache_set_release(struct kobject *kobj)
{
struct cache_set *c = container_of(kobj, struct cache_set, kobj);
@@ -1524,7 +1697,6 @@
{
struct cache_set *c = container_of(cl, struct cache_set, cl);
struct cache *ca;
- unsigned int i;
debugfs_remove(c->debug);
@@ -1533,15 +1705,16 @@
bch_journal_free(c);
mutex_lock(&bch_register_lock);
- for_each_cache(ca, c, i)
- if (ca) {
- ca->set = NULL;
- c->cache[ca->sb.nr_this_dev] = NULL;
- kobject_put(&ca->kobj);
- }
-
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->cache->sb)));
+
+ ca = c->cache;
+ if (ca) {
+ ca->set = NULL;
+ c->cache = NULL;
+ kobject_put(&ca->kobj);
+ }
+
if (c->moving_gc_wq)
destroy_workqueue(c->moving_gc_wq);
@@ -1554,7 +1727,7 @@
list_del(&c->list);
mutex_unlock(&bch_register_lock);
- pr_info("Cache set %pU unregistered", c->sb.set_uuid);
+ pr_info("Cache set %pU unregistered\n", c->set_uuid);
wake_up(&unregister_wait);
closure_debug_destroy(&c->cl);
@@ -1564,9 +1737,8 @@
static void cache_set_flush(struct closure *cl)
{
struct cache_set *c = container_of(cl, struct cache_set, caching);
- struct cache *ca;
+ struct cache *ca = c->cache;
struct btree *b;
- unsigned int i;
bch_cache_accounting_destroy(&c->accounting);
@@ -1576,20 +1748,23 @@
if (!IS_ERR_OR_NULL(c->gc_thread))
kthread_stop(c->gc_thread);
- if (!IS_ERR_OR_NULL(c->root))
+ if (!IS_ERR(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) {
- mutex_lock(&b->write_lock);
- if (btree_node_dirty(b))
- __bch_btree_node_write(b, NULL);
- mutex_unlock(&b->write_lock);
- }
+ /*
+ * Avoid flushing cached nodes if cache set is retiring
+ * due to too many I/O errors detected.
+ */
+ if (!test_bit(CACHE_SET_IO_DISABLE, &c->flags))
+ list_for_each_entry(b, &c->btree_cache, list) {
+ mutex_lock(&b->write_lock);
+ if (btree_node_dirty(b))
+ __bch_btree_node_write(b, NULL);
+ mutex_unlock(&b->write_lock);
+ }
- for_each_cache(ca, c, i)
- if (ca->alloc_thread)
- kthread_stop(ca->alloc_thread);
+ if (ca->alloc_thread)
+ kthread_stop(ca->alloc_thread);
if (c->journal.cur) {
cancel_delayed_work_sync(&c->journal.work);
@@ -1621,37 +1796,37 @@
struct cached_dev *dc)
{
if (dc->stop_when_cache_set_failed == BCH_CACHED_DEV_STOP_ALWAYS) {
- pr_warn("stop_when_cache_set_failed of %s is \"always\", stop it for failed cache set %pU.",
- d->disk->disk_name, c->sb.set_uuid);
+ pr_warn("stop_when_cache_set_failed of %s is \"always\", stop it for failed cache set %pU.\n",
+ d->disk->disk_name, c->set_uuid);
bcache_device_stop(d);
} else if (atomic_read(&dc->has_dirty)) {
/*
* dc->stop_when_cache_set_failed == BCH_CACHED_STOP_AUTO
* and dc->has_dirty == 1
*/
- pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is dirty, stop it to avoid potential data corruption.",
+ pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is dirty, stop it to avoid potential data corruption.\n",
d->disk->disk_name);
- /*
- * There might be a small time gap that cache set is
- * released but bcache device is not. Inside this time
- * gap, regular I/O requests will directly go into
- * backing device as no cache set attached to. This
- * behavior may also introduce potential inconsistence
- * data in writeback mode while cache is dirty.
- * Therefore before calling bcache_device_stop() due
- * to a broken cache device, dc->io_disable should be
- * explicitly set to true.
- */
- dc->io_disable = true;
- /* make others know io_disable is true earlier */
- smp_mb();
- bcache_device_stop(d);
+ /*
+ * There might be a small time gap that cache set is
+ * released but bcache device is not. Inside this time
+ * gap, regular I/O requests will directly go into
+ * backing device as no cache set attached to. This
+ * behavior may also introduce potential inconsistence
+ * data in writeback mode while cache is dirty.
+ * Therefore before calling bcache_device_stop() due
+ * to a broken cache device, dc->io_disable should be
+ * explicitly set to true.
+ */
+ dc->io_disable = true;
+ /* make others know io_disable is true earlier */
+ smp_mb();
+ bcache_device_stop(d);
} else {
/*
* dc->stop_when_cache_set_failed == BCH_CACHED_STOP_AUTO
* and dc->has_dirty == 0
*/
- pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is clean, keep it alive.",
+ pr_warn("stop_when_cache_set_failed of %s is \"auto\" and cache is clean, keep it alive.\n",
d->disk->disk_name);
}
}
@@ -1689,6 +1864,7 @@
void bch_cache_set_stop(struct cache_set *c)
{
if (!test_and_set_bit(CACHE_SET_STOPPING, &c->flags))
+ /* closure_fn set to __cache_set_unregister() */
closure_queue(&c->caching);
}
@@ -1698,12 +1874,13 @@
bch_cache_set_stop(c);
}
-#define alloc_bucket_pages(gfp, c) \
- ((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(bucket_pages(c))))
+#define alloc_meta_bucket_pages(gfp, sb) \
+ ((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(meta_bucket_pages(sb))))
struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
{
int iter_size;
+ struct cache *ca = container_of(sb, struct cache, sb);
struct cache_set *c = kzalloc(sizeof(struct cache_set), GFP_KERNEL);
if (!c)
@@ -1725,17 +1902,16 @@
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;
+ memcpy(c->set_uuid, sb->set_uuid, 16);
+
+ c->cache = ca;
+ c->cache->set = c;
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(sb) / sizeof(struct uuid_entry);
c->devices_max_used = 0;
atomic_set(&c->attached_dev_nr, 0);
- c->btree_pages = bucket_pages(c);
+ c->btree_pages = meta_bucket_pages(sb);
if (c->btree_pages > BTREE_MAX_PAGES)
c->btree_pages = max_t(int, c->btree_pages / 4,
BTREE_MAX_PAGES);
@@ -1761,29 +1937,52 @@
INIT_LIST_HEAD(&c->btree_cache_freed);
INIT_LIST_HEAD(&c->data_buckets);
- iter_size = (sb->bucket_size / sb->block_size + 1) *
+ iter_size = ((meta_bucket_pages(sb) * PAGE_SECTORS) / sb->block_size + 1) *
sizeof(struct btree_iter_set);
- if (!(c->devices = kcalloc(c->nr_uuids, sizeof(void *), GFP_KERNEL)) ||
- mempool_init_slab_pool(&c->search, 32, bch_search_cache) ||
- mempool_init_kmalloc_pool(&c->bio_meta, 2,
- sizeof(struct bbio) + sizeof(struct bio_vec) *
- bucket_pages(c)) ||
- mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
- bioset_init(&c->bio_split, 4, offsetof(struct bbio, bio),
- BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER) ||
- !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) ||
- !(c->moving_gc_wq = alloc_workqueue("bcache_gc",
- WQ_MEM_RECLAIM, 0)) ||
- bch_journal_alloc(c) ||
- bch_btree_cache_alloc(c) ||
- bch_open_buckets_alloc(c) ||
- bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages)))
+ c->devices = kcalloc(c->nr_uuids, sizeof(void *), GFP_KERNEL);
+ if (!c->devices)
+ goto err;
+
+ if (mempool_init_slab_pool(&c->search, 32, bch_search_cache))
+ goto err;
+
+ if (mempool_init_kmalloc_pool(&c->bio_meta, 2,
+ sizeof(struct bbio) +
+ sizeof(struct bio_vec) * meta_bucket_pages(sb)))
+ goto err;
+
+ if (mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size))
+ goto err;
+
+ if (bioset_init(&c->bio_split, 4, offsetof(struct bbio, bio),
+ BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER))
+ goto err;
+
+ c->uuids = alloc_meta_bucket_pages(GFP_KERNEL, sb);
+ if (!c->uuids)
+ goto err;
+
+ c->moving_gc_wq = alloc_workqueue("bcache_gc", WQ_MEM_RECLAIM, 0);
+ if (!c->moving_gc_wq)
+ goto err;
+
+ if (bch_journal_alloc(c))
+ goto err;
+
+ if (bch_btree_cache_alloc(c))
+ goto err;
+
+ if (bch_open_buckets_alloc(c))
+ goto err;
+
+ if (bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages)))
goto err;
c->congested_read_threshold_us = 2000;
c->congested_write_threshold_us = 20000;
c->error_limit = DEFAULT_IO_ERROR_LIMIT;
+ c->idle_max_writeback_rate_enabled = 1;
WARN_ON(test_and_clear_bit(CACHE_SET_IO_DISABLE, &c->flags));
return c;
@@ -1796,19 +1995,17 @@
{
const char *err = "cannot allocate memory";
struct cached_dev *dc, *t;
- struct cache *ca;
+ struct cache *ca = c->cache;
struct closure cl;
- unsigned int i;
LIST_HEAD(journal);
struct journal_replay *l;
closure_init_stack(&cl);
- for_each_cache(ca, c, i)
- c->nbuckets += ca->sb.nbuckets;
+ c->nbuckets = ca->sb.nbuckets;
set_gc_sectors(c);
- if (CACHE_SYNC(&c->sb)) {
+ if (CACHE_SYNC(&c->cache->sb)) {
struct bkey *k;
struct jset *j;
@@ -1816,7 +2013,7 @@
if (bch_journal_read(c, &journal))
goto err;
- pr_debug("btree_journal_read() done");
+ pr_debug("btree_journal_read() done\n");
err = "no journal entries found";
if (list_empty(&journal))
@@ -1825,8 +2022,8 @@
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(ca, j->prio_bucket[ca->sb.nr_this_dev]))
+ goto err;
/*
* If prio_read() fails it'll call cache_set_error and we'll
@@ -1860,7 +2057,7 @@
bch_journal_mark(c, &journal);
bch_initial_gc_finish(c);
- pr_debug("btree_check() done");
+ pr_debug("btree_check() done\n");
/*
* bcache_journal_next() can't happen sooner, or
@@ -1870,9 +2067,8 @@
bch_journal_next(&c->journal);
err = "error starting allocator thread";
- for_each_cache(ca, c, i)
- if (bch_cache_allocator_start(ca))
- goto err;
+ if (bch_cache_allocator_start(ca))
+ goto err;
/*
* First place it's safe to allocate: btree_check() and
@@ -1891,28 +2087,23 @@
if (bch_journal_replay(c, &journal))
goto err;
} else {
- pr_notice("invalidating existing data");
+ unsigned int j;
- for_each_cache(ca, c, i) {
- unsigned int j;
+ pr_notice("invalidating existing data\n");
+ ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
+ 2, SB_JOURNAL_BUCKETS);
- 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;
- }
+ for (j = 0; j < ca->sb.keys; j++)
+ ca->sb.d[j] = ca->sb.first_bucket + j;
bch_initial_gc_finish(c);
err = "error starting allocator thread";
- for_each_cache(ca, c, i)
- if (bch_cache_allocator_start(ca))
- goto err;
+ if (bch_cache_allocator_start(ca))
+ goto err;
mutex_lock(&c->bucket_lock);
- for_each_cache(ca, c, i)
- bch_prio_write(ca, true);
+ bch_prio_write(ca, true);
mutex_unlock(&c->bucket_lock);
err = "cannot allocate new UUID bucket";
@@ -1921,7 +2112,7 @@
err = "cannot allocate new btree root";
c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL);
- if (IS_ERR_OR_NULL(c->root))
+ if (IS_ERR(c->root))
goto err;
mutex_lock(&c->root->write_lock);
@@ -1937,7 +2128,7 @@
* everything is set up - fortunately journal entries won't be
* written until the SET_CACHE_SYNC() here:
*/
- SET_CACHE_SYNC(&c->sb, true);
+ SET_CACHE_SYNC(&c->cache->sb, true);
bch_journal_next(&c->journal);
bch_journal_meta(c, &cl);
@@ -1948,14 +2139,18 @@
goto err;
closure_sync(&cl);
- c->sb.last_mount = (u32)ktime_get_real_seconds();
+ c->cache->sb.last_mount = (u32)ktime_get_real_seconds();
bcache_write_super(c);
+
+ if (bch_has_feature_obso_large_bucket(&c->cache->sb))
+ pr_err("Detect obsoleted large bucket layout, all attached bcache device will be read-only\n");
list_for_each_entry_safe(dc, t, &uncached_devices, list)
bch_cached_dev_attach(dc, c, NULL);
flash_devs_run(c);
+ bch_journal_space_reserve(&c->journal);
set_bit(CACHE_SET_RUNNING, &c->flags);
return 0;
err:
@@ -1966,17 +2161,10 @@
}
closure_sync(&cl);
- /* XXX: test this, it's broken */
+
bch_cache_set_error(c, "%s", err);
return -EIO;
-}
-
-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.bucket_size &&
- ca->sb.nr_in_set == c->sb.nr_in_set;
}
static const char *register_cache_set(struct cache *ca)
@@ -1986,15 +2174,9 @@
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])
+ if (!memcmp(c->set_uuid, ca->sb.set_uuid, 16)) {
+ if (c->cache)
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;
}
@@ -2004,7 +2186,7 @@
return err;
err = "error creating kobject";
- if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->sb.set_uuid) ||
+ if (kobject_add(&c->kobj, bcache_kobj, "%pU", c->set_uuid) ||
kobject_add(&c->internal, &c->kobj, "internal"))
goto err;
@@ -2020,31 +2202,13 @@
sysfs_create_link(&c->kobj, &ca->kobj, buf))
goto err;
- /*
- * A special case is both ca->sb.seq and c->sb.seq are 0,
- * such condition happens on a new created cache device whose
- * super block is never flushed yet. In this case c->sb.version
- * and other members should be updated too, otherwise we will
- * have a mistaken super block version in cache set.
- */
- if (ca->sb.seq > c->sb.seq || c->sb.seq == 0) {
- 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);
- }
-
kobject_get(&ca->kobj);
ca->set = c;
- ca->set->cache[ca->sb.nr_this_dev] = ca;
- c->cache_by_alloc[c->caches_loaded++] = ca;
+ ca->set->cache = ca;
- if (c->caches_loaded == c->sb.nr_in_set) {
- err = "failed to run cache set";
- if (run_cache_set(c) < 0)
- goto err;
- }
+ err = "failed to run cache set";
+ if (run_cache_set(c) < 0)
+ goto err;
return NULL;
err:
@@ -2054,17 +2218,18 @@
/* Cache device */
+/* When ca->kobj released */
void bch_cache_release(struct kobject *kobj)
{
struct cache *ca = container_of(kobj, struct cache, kobj);
unsigned int i;
if (ca->set) {
- BUG_ON(ca->set->cache[ca->sb.nr_this_dev] != ca);
- ca->set->cache[ca->sb.nr_this_dev] = NULL;
+ BUG_ON(ca->set->cache != ca);
+ ca->set->cache = NULL;
}
- free_pages((unsigned long) ca->disk_buckets, ilog2(bucket_pages(ca)));
+ free_pages((unsigned long) ca->disk_buckets, ilog2(meta_bucket_pages(&ca->sb)));
kfree(ca->prio_buckets);
vfree(ca->buckets);
@@ -2074,8 +2239,8 @@
for (i = 0; i < RESERVE_NR; i++)
free_fifo(&ca->free[i]);
- if (ca->sb_bio.bi_inline_vecs[0].bv_page)
- put_page(bio_first_page_all(&ca->sb_bio));
+ if (ca->sb_disk)
+ put_page(virt_to_page(ca->sb_disk));
if (!IS_ERR_OR_NULL(ca->bdev))
blkdev_put(ca->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
@@ -2089,6 +2254,8 @@
size_t free;
size_t btree_buckets;
struct bucket *b;
+ int ret = -ENOMEM;
+ const char *err = NULL;
__module_get(THIS_MODULE);
kobject_init(&ca->kobj, &bch_cache_ktype);
@@ -2106,30 +2273,96 @@
*/
btree_buckets = ca->sb.njournal_buckets ?: 8;
free = roundup_pow_of_two(ca->sb.nbuckets) >> 10;
+ if (!free) {
+ ret = -EPERM;
+ err = "ca->sb.nbuckets is too small";
+ goto err_free;
+ }
- if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets, GFP_KERNEL) ||
- !init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca), GFP_KERNEL) ||
- !init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL) ||
- !init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL) ||
- !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) ||
- !init_heap(&ca->heap, free << 3, GFP_KERNEL) ||
- !(ca->buckets = vzalloc(array_size(sizeof(struct bucket),
- ca->sb.nbuckets))) ||
- !(ca->prio_buckets = kzalloc(array3_size(sizeof(uint64_t),
- prio_buckets(ca), 2),
- GFP_KERNEL)) ||
- !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)))
- return -ENOMEM;
+ if (!init_fifo(&ca->free[RESERVE_BTREE], btree_buckets,
+ GFP_KERNEL)) {
+ err = "ca->free[RESERVE_BTREE] alloc failed";
+ goto err_btree_alloc;
+ }
+
+ if (!init_fifo_exact(&ca->free[RESERVE_PRIO], prio_buckets(ca),
+ GFP_KERNEL)) {
+ err = "ca->free[RESERVE_PRIO] alloc failed";
+ goto err_prio_alloc;
+ }
+
+ if (!init_fifo(&ca->free[RESERVE_MOVINGGC], free, GFP_KERNEL)) {
+ err = "ca->free[RESERVE_MOVINGGC] alloc failed";
+ goto err_movinggc_alloc;
+ }
+
+ if (!init_fifo(&ca->free[RESERVE_NONE], free, GFP_KERNEL)) {
+ err = "ca->free[RESERVE_NONE] alloc failed";
+ goto err_none_alloc;
+ }
+
+ if (!init_fifo(&ca->free_inc, free << 2, GFP_KERNEL)) {
+ err = "ca->free_inc alloc failed";
+ goto err_free_inc_alloc;
+ }
+
+ if (!init_heap(&ca->heap, free << 3, GFP_KERNEL)) {
+ err = "ca->heap alloc failed";
+ goto err_heap_alloc;
+ }
+
+ ca->buckets = vzalloc(array_size(sizeof(struct bucket),
+ ca->sb.nbuckets));
+ if (!ca->buckets) {
+ err = "ca->buckets alloc failed";
+ goto err_buckets_alloc;
+ }
+
+ ca->prio_buckets = kzalloc(array3_size(sizeof(uint64_t),
+ prio_buckets(ca), 2),
+ GFP_KERNEL);
+ if (!ca->prio_buckets) {
+ err = "ca->prio_buckets alloc failed";
+ goto err_prio_buckets_alloc;
+ }
+
+ ca->disk_buckets = alloc_meta_bucket_pages(GFP_KERNEL, &ca->sb);
+ if (!ca->disk_buckets) {
+ err = "ca->disk_buckets alloc failed";
+ goto err_disk_buckets_alloc;
+ }
ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca);
for_each_bucket(b, ca)
atomic_set(&b->pin, 0);
-
return 0;
+
+err_disk_buckets_alloc:
+ kfree(ca->prio_buckets);
+err_prio_buckets_alloc:
+ vfree(ca->buckets);
+err_buckets_alloc:
+ free_heap(&ca->heap);
+err_heap_alloc:
+ free_fifo(&ca->free_inc);
+err_free_inc_alloc:
+ free_fifo(&ca->free[RESERVE_NONE]);
+err_none_alloc:
+ free_fifo(&ca->free[RESERVE_MOVINGGC]);
+err_movinggc_alloc:
+ free_fifo(&ca->free[RESERVE_PRIO]);
+err_prio_alloc:
+ free_fifo(&ca->free[RESERVE_BTREE]);
+err_btree_alloc:
+err_free:
+ module_put(THIS_MODULE);
+ if (err)
+ pr_notice("error %s: %s\n", ca->cache_dev_name, err);
+ return ret;
}
-static int register_cache(struct cache_sb *sb, struct page *sb_page,
+static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
struct block_device *bdev, struct cache *ca)
{
const char *err = NULL; /* must be set for any error case */
@@ -2139,19 +2372,24 @@
memcpy(&ca->sb, sb, sizeof(struct cache_sb));
ca->bdev = bdev;
ca->bdev->bd_holder = ca;
-
- bio_init(&ca->sb_bio, ca->sb_bio.bi_inline_vecs, 1);
- bio_first_bvec_all(&ca->sb_bio)->bv_page = sb_page;
- get_page(sb_page);
+ ca->sb_disk = sb_disk;
if (blk_queue_discard(bdev_get_queue(bdev)))
ca->discard = CACHE_DISCARD(&ca->sb);
ret = cache_alloc(ca);
if (ret != 0) {
+ /*
+ * If we failed here, it means ca->kobj is not initialized yet,
+ * kobject_put() won't be called and there is no chance to
+ * call blkdev_put() to bdev in bch_cache_release(). So we
+ * explicitly call blkdev_put() here.
+ */
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
if (ret == -ENOMEM)
err = "cache_alloc(): -ENOMEM";
+ else if (ret == -EPERM)
+ err = "cache_alloc(): cache device is too small";
else
err = "cache_alloc(): unknown error";
goto err;
@@ -2174,14 +2412,14 @@
goto out;
}
- pr_info("registered cache device %s", ca->cache_dev_name);
+ pr_info("registered cache device %s\n", ca->cache_dev_name);
out:
kobject_put(&ca->kobj);
err:
if (err)
- pr_notice("error %s: %s", ca->cache_dev_name, err);
+ pr_notice("error %s: %s\n", ca->cache_dev_name, err);
return ret;
}
@@ -2190,9 +2428,13 @@
static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *buffer, size_t size);
+static ssize_t bch_pending_bdevs_cleanup(struct kobject *k,
+ struct kobj_attribute *attr,
+ const char *buffer, size_t size);
kobj_attribute_write(register, register_bcache);
kobj_attribute_write(register_quiet, register_bcache);
+kobj_attribute_write(pendings_cleanup, bch_pending_bdevs_cleanup);
static bool bch_is_open_backing(struct block_device *bdev)
{
@@ -2212,13 +2454,14 @@
static bool bch_is_open_cache(struct block_device *bdev)
{
struct cache_set *c, *tc;
- struct cache *ca;
- unsigned int i;
- list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
- for_each_cache(ca, c, i)
- if (ca->bdev == bdev)
- return true;
+ list_for_each_entry_safe(c, tc, &bch_cache_sets, list) {
+ struct cache *ca = c->cache;
+
+ if (ca->bdev == bdev)
+ return true;
+ }
+
return false;
}
@@ -2227,27 +2470,121 @@
return bch_is_open_cache(bdev) || bch_is_open_backing(bdev);
}
+struct async_reg_args {
+ struct delayed_work reg_work;
+ char *path;
+ struct cache_sb *sb;
+ struct cache_sb_disk *sb_disk;
+ struct block_device *bdev;
+};
+
+static void register_bdev_worker(struct work_struct *work)
+{
+ int fail = false;
+ struct async_reg_args *args =
+ container_of(work, struct async_reg_args, reg_work.work);
+ struct cached_dev *dc;
+
+ dc = kzalloc(sizeof(*dc), GFP_KERNEL);
+ if (!dc) {
+ fail = true;
+ put_page(virt_to_page(args->sb_disk));
+ blkdev_put(args->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ goto out;
+ }
+
+ mutex_lock(&bch_register_lock);
+ if (register_bdev(args->sb, args->sb_disk, args->bdev, dc) < 0)
+ fail = true;
+ mutex_unlock(&bch_register_lock);
+
+out:
+ if (fail)
+ pr_info("error %s: fail to register backing device\n",
+ args->path);
+ kfree(args->sb);
+ kfree(args->path);
+ kfree(args);
+ module_put(THIS_MODULE);
+}
+
+static void register_cache_worker(struct work_struct *work)
+{
+ int fail = false;
+ struct async_reg_args *args =
+ container_of(work, struct async_reg_args, reg_work.work);
+ struct cache *ca;
+
+ ca = kzalloc(sizeof(*ca), GFP_KERNEL);
+ if (!ca) {
+ fail = true;
+ put_page(virt_to_page(args->sb_disk));
+ blkdev_put(args->bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ goto out;
+ }
+
+ /* blkdev_put() will be called in bch_cache_release() */
+ if (register_cache(args->sb, args->sb_disk, args->bdev, ca) != 0)
+ fail = true;
+
+out:
+ if (fail)
+ pr_info("error %s: fail to register cache device\n",
+ args->path);
+ kfree(args->sb);
+ kfree(args->path);
+ kfree(args);
+ module_put(THIS_MODULE);
+}
+
+static void register_device_aync(struct async_reg_args *args)
+{
+ if (SB_IS_BDEV(args->sb))
+ INIT_DELAYED_WORK(&args->reg_work, register_bdev_worker);
+ else
+ INIT_DELAYED_WORK(&args->reg_work, register_cache_worker);
+
+ /* 10 jiffies is enough for a delay */
+ queue_delayed_work(system_wq, &args->reg_work, 10);
+}
+
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";
+ const char *err;
char *path = NULL;
- struct cache_sb *sb = NULL;
- struct block_device *bdev = NULL;
- struct page *sb_page = NULL;
+ struct cache_sb *sb;
+ struct cache_sb_disk *sb_disk;
+ struct block_device *bdev;
+ ssize_t ret;
+ bool async_registration = false;
+#ifdef CONFIG_BCACHE_ASYNC_REGISTRATION
+ async_registration = true;
+#endif
+
+ ret = -EBUSY;
+ err = "failed to reference bcache module";
if (!try_module_get(THIS_MODULE))
- return -EBUSY;
+ goto out;
+ /* For latest state of bcache_is_reboot */
+ smp_mb();
+ err = "bcache is in reboot";
+ if (bcache_is_reboot)
+ goto out_module_put;
+
+ ret = -ENOMEM;
+ err = "cannot allocate memory";
path = kstrndup(buffer, size, GFP_KERNEL);
if (!path)
- goto err;
+ goto out_module_put;
sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL);
if (!sb)
- goto err;
+ goto out_free_path;
+ ret = -EINVAL;
err = "failed to open device";
bdev = blkdev_get_by_path(strim(path),
FMODE_READ|FMODE_WRITE|FMODE_EXCL,
@@ -2264,56 +2601,142 @@
if (!IS_ERR(bdev))
bdput(bdev);
if (attr == &ksysfs_register_quiet)
- goto out;
+ goto done;
}
- goto err;
+ goto out_free_sb;
}
err = "failed to set blocksize";
if (set_blocksize(bdev, 4096))
- goto err_close;
+ goto out_blkdev_put;
- err = read_super(sb, bdev, &sb_page);
+ err = read_super(sb, bdev, &sb_disk);
if (err)
- goto err_close;
+ goto out_blkdev_put;
err = "failed to register device";
+
+ if (async_registration) {
+ /* register in asynchronous way */
+ struct async_reg_args *args =
+ kzalloc(sizeof(struct async_reg_args), GFP_KERNEL);
+
+ if (!args) {
+ ret = -ENOMEM;
+ err = "cannot allocate memory";
+ goto out_put_sb_page;
+ }
+
+ args->path = path;
+ args->sb = sb;
+ args->sb_disk = sb_disk;
+ args->bdev = bdev;
+ register_device_aync(args);
+ /* No wait and returns to user space */
+ goto async_done;
+ }
+
if (SB_IS_BDEV(sb)) {
struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL);
if (!dc)
- goto err_close;
+ goto out_put_sb_page;
mutex_lock(&bch_register_lock);
- register_bdev(sb, sb_page, bdev, dc);
+ ret = register_bdev(sb, sb_disk, bdev, dc);
mutex_unlock(&bch_register_lock);
+ /* blkdev_put() will be called in cached_dev_free() */
+ if (ret < 0)
+ goto out_free_sb;
} else {
struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca)
- goto err_close;
+ goto out_put_sb_page;
- if (register_cache(sb, sb_page, bdev, ca) != 0)
- goto err;
+ /* blkdev_put() will be called in bch_cache_release() */
+ if (register_cache(sb, sb_disk, bdev, ca) != 0)
+ goto out_free_sb;
}
-out:
- if (sb_page)
- put_page(sb_page);
+
+done:
kfree(sb);
kfree(path);
module_put(THIS_MODULE);
- return ret;
+async_done:
+ return size;
-err_close:
- blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-err:
- pr_info("error %s: %s", path, err);
- ret = -EINVAL;
- goto out;
+out_put_sb_page:
+ put_page(virt_to_page(sb_disk));
+out_blkdev_put:
+ blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+out_free_sb:
+ kfree(sb);
+out_free_path:
+ kfree(path);
+ path = NULL;
+out_module_put:
+ module_put(THIS_MODULE);
+out:
+ pr_info("error %s: %s\n", path?path:"", err);
+ return ret;
+}
+
+
+struct pdev {
+ struct list_head list;
+ struct cached_dev *dc;
+};
+
+static ssize_t bch_pending_bdevs_cleanup(struct kobject *k,
+ struct kobj_attribute *attr,
+ const char *buffer,
+ size_t size)
+{
+ LIST_HEAD(pending_devs);
+ ssize_t ret = size;
+ struct cached_dev *dc, *tdc;
+ struct pdev *pdev, *tpdev;
+ struct cache_set *c, *tc;
+
+ mutex_lock(&bch_register_lock);
+ list_for_each_entry_safe(dc, tdc, &uncached_devices, list) {
+ pdev = kmalloc(sizeof(struct pdev), GFP_KERNEL);
+ if (!pdev)
+ break;
+ pdev->dc = dc;
+ list_add(&pdev->list, &pending_devs);
+ }
+
+ list_for_each_entry_safe(pdev, tpdev, &pending_devs, list) {
+ list_for_each_entry_safe(c, tc, &bch_cache_sets, list) {
+ char *pdev_set_uuid = pdev->dc->sb.set_uuid;
+ char *set_uuid = c->set_uuid;
+
+ if (!memcmp(pdev_set_uuid, set_uuid, 16)) {
+ list_del(&pdev->list);
+ kfree(pdev);
+ break;
+ }
+ }
+ }
+ mutex_unlock(&bch_register_lock);
+
+ list_for_each_entry_safe(pdev, tpdev, &pending_devs, list) {
+ pr_info("delete pdev %p\n", pdev);
+ list_del(&pdev->list);
+ bcache_device_stop(&pdev->dc->disk);
+ kfree(pdev);
+ }
+
+ return ret;
}
static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x)
{
+ if (bcache_is_reboot)
+ return NOTIFY_DONE;
+
if (code == SYS_DOWN ||
code == SYS_HALT ||
code == SYS_POWER_OFF) {
@@ -2326,22 +2749,57 @@
mutex_lock(&bch_register_lock);
+ if (bcache_is_reboot)
+ goto out;
+
+ /* New registration is rejected since now */
+ bcache_is_reboot = true;
+ /*
+ * Make registering caller (if there is) on other CPU
+ * core know bcache_is_reboot set to true earlier
+ */
+ smp_mb();
+
if (list_empty(&bch_cache_sets) &&
list_empty(&uncached_devices))
goto out;
- pr_info("Stopping all devices:");
+ mutex_unlock(&bch_register_lock);
+ pr_info("Stopping all devices:\n");
+
+ /*
+ * The reason bch_register_lock is not held to call
+ * bch_cache_set_stop() and bcache_device_stop() is to
+ * avoid potential deadlock during reboot, because cache
+ * set or bcache device stopping process will acqurie
+ * bch_register_lock too.
+ *
+ * We are safe here because bcache_is_reboot sets to
+ * true already, register_bcache() will reject new
+ * registration now. bcache_is_reboot also makes sure
+ * bcache_reboot() won't be re-entered on by other thread,
+ * so there is no race in following list iteration by
+ * list_for_each_entry_safe().
+ */
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);
+
+ /*
+ * Give an early chance for other kthreads and
+ * kworkers to stop themselves
+ */
+ schedule();
+
/* What's a condition variable? */
while (1) {
- long timeout = start + 2 * HZ - jiffies;
+ long timeout = start + 10 * HZ - jiffies;
+ mutex_lock(&bch_register_lock);
stopped = list_empty(&bch_cache_sets) &&
list_empty(&uncached_devices);
@@ -2353,15 +2811,14 @@
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");
+ pr_info("All devices stopped\n");
else
- pr_notice("Timeout waiting for devices to be closed");
+ pr_notice("Timeout waiting for devices to be closed\n");
out:
mutex_unlock(&bch_register_lock);
}
@@ -2384,6 +2841,9 @@
destroy_workqueue(bcache_wq);
if (bch_journal_wq)
destroy_workqueue(bch_journal_wq);
+ if (bch_flush_wq)
+ destroy_workqueue(bch_flush_wq);
+ bch_btree_exit();
if (bcache_major)
unregister_blkdev(bcache_major, "bcache");
@@ -2391,13 +2851,42 @@
mutex_destroy(&bch_register_lock);
}
+/* Check and fixup module parameters */
+static void check_module_parameters(void)
+{
+ if (bch_cutoff_writeback_sync == 0)
+ bch_cutoff_writeback_sync = CUTOFF_WRITEBACK_SYNC;
+ else if (bch_cutoff_writeback_sync > CUTOFF_WRITEBACK_SYNC_MAX) {
+ pr_warn("set bch_cutoff_writeback_sync (%u) to max value %u\n",
+ bch_cutoff_writeback_sync, CUTOFF_WRITEBACK_SYNC_MAX);
+ bch_cutoff_writeback_sync = CUTOFF_WRITEBACK_SYNC_MAX;
+ }
+
+ if (bch_cutoff_writeback == 0)
+ bch_cutoff_writeback = CUTOFF_WRITEBACK;
+ else if (bch_cutoff_writeback > CUTOFF_WRITEBACK_MAX) {
+ pr_warn("set bch_cutoff_writeback (%u) to max value %u\n",
+ bch_cutoff_writeback, CUTOFF_WRITEBACK_MAX);
+ bch_cutoff_writeback = CUTOFF_WRITEBACK_MAX;
+ }
+
+ if (bch_cutoff_writeback > bch_cutoff_writeback_sync) {
+ pr_warn("set bch_cutoff_writeback (%u) to %u\n",
+ bch_cutoff_writeback, bch_cutoff_writeback_sync);
+ bch_cutoff_writeback = bch_cutoff_writeback_sync;
+ }
+}
+
static int __init bcache_init(void)
{
static const struct attribute *files[] = {
&ksysfs_register.attr,
&ksysfs_register_quiet.attr,
+ &ksysfs_pendings_cleanup.attr,
NULL
};
+
+ check_module_parameters();
mutex_init(&bch_register_lock);
init_waitqueue_head(&unregister_wait);
@@ -2410,8 +2899,24 @@
return bcache_major;
}
+ if (bch_btree_init())
+ goto err;
+
bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0);
if (!bcache_wq)
+ goto err;
+
+ /*
+ * Let's not make this `WQ_MEM_RECLAIM` for the following reasons:
+ *
+ * 1. It used `system_wq` before which also does no memory reclaim.
+ * 2. With `WQ_MEM_RECLAIM` desktop stalls, increased boot times, and
+ * reduced throughput can be observed.
+ *
+ * We still want to user our own queue to not congest the `system_wq`.
+ */
+ bch_flush_wq = alloc_workqueue("bch_flush", 0, 0);
+ if (!bch_flush_wq)
goto err;
bch_journal_wq = alloc_workqueue("bch_journal", WQ_MEM_RECLAIM, 0);
@@ -2426,8 +2931,10 @@
sysfs_create_files(bcache_kobj, files))
goto err;
- bch_debug_init(bcache_kobj);
+ bch_debug_init();
closure_debug_init();
+
+ bcache_is_reboot = false;
return 0;
err:
@@ -2435,5 +2942,18 @@
return -ENOMEM;
}
+/*
+ * Module hooks
+ */
module_exit(bcache_exit);
module_init(bcache_init);
+
+module_param(bch_cutoff_writeback, uint, 0);
+MODULE_PARM_DESC(bch_cutoff_writeback, "threshold to cutoff writeback");
+
+module_param(bch_cutoff_writeback_sync, uint, 0);
+MODULE_PARM_DESC(bch_cutoff_writeback_sync, "hard threshold to cutoff writeback");
+
+MODULE_DESCRIPTION("Bcache: a Linux block layer cache");
+MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
+MODULE_LICENSE("GPL");
--
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