[PATCH v1 04/14] bcache: add set_uuid in struct cache_set

colyli
2020-08-15T22:24:13Z

This patch adds a separated set_uuid[16] in struct cache_set, to store
the uuid of the cache set. This is the preparation to remove the
embedded struct cache_sb from struct cache_set.

Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/bcache/bcache.h | 1 +
drivers/md/bcache/debug.c | 2 +-
drivers/md/bcache/super.c | 24 ++++++++++++------------
include/trace/events/bcache.h | 4 ++--
4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 7ffe6b2d179b..94a62acac4fc 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -668,6 +668,7 @@ struct cache_set {
struct mutex verify_lock;
#endif

+ uint8_t set_uuid[16];
unsigned int nr_uuids;
struct uuid_entry *uuids;
BKEY_PADDED(uuid_bucket);
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index 336f43910383..0ccc1b0baa42 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -238,7 +238,7 @@ void bch_debug_init_cache_set(struct cache_set *c)
if (!IS_ERR_OR_NULL(bcache_debug)) {
char name[50];

- snprintf(name, 50, "bcache-%pU", c->sb.set_uuid);
+ snprintf(name, 50, "bcache-%pU", c->set_uuid);
c->debug = debugfs_create_file(name, 0400, bcache_debug, c,
&cache_set_debug_ops);
}
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 91883d5c4b62..90a419ad6445 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1189,8 +1189,8 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
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) {
@@ -1262,7 +1262,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
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);
@@ -1324,7 +1324,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c,
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;
}

@@ -1632,7 +1632,7 @@ bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
vaf.va = &args;

pr_err("error on %pU: %pV, disabling caching\n",
- c->sb.set_uuid, &vaf);
+ c->set_uuid, &vaf);

va_end(args);

@@ -1685,7 +1685,7 @@ static void cache_set_free(struct closure *cl)
list_del(&c->list);
mutex_unlock(&bch_register_lock);

- pr_info("Cache set %pU unregistered\n", c->sb.set_uuid);
+ pr_info("Cache set %pU unregistered\n", c->set_uuid);
wake_up(&unregister_wait);

closure_debug_destroy(&c->cl);
@@ -1755,7 +1755,7 @@ static void conditional_stop_bcache_device(struct cache_set *c,
{
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.\n",
- d->disk->disk_name, c->sb.set_uuid);
+ d->disk->disk_name, c->set_uuid);
bcache_device_stop(d);
} else if (atomic_read(&dc->has_dirty)) {
/*
@@ -1862,7 +1862,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)

bch_cache_accounting_init(&c->accounting, &c->cl);

- memcpy(c->sb.set_uuid, sb->set_uuid, 16);
+ memcpy(c->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;
@@ -2145,7 +2145,7 @@ static const char *register_cache_set(struct cache *ca)
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 (!memcmp(c->set_uuid, ca->sb.set_uuid, 16)) {
if (c->cache)
return "duplicate cache set member";

@@ -2163,7 +2163,7 @@ static const char *register_cache_set(struct cache *ca)
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;

@@ -2188,7 +2188,7 @@ static const char *register_cache_set(struct cache *ca)
*/
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);
+ memcpy(c->set_uuid, ca->sb.set_uuid, 16);
c->sb.flags = ca->sb.flags;
c->sb.seq = ca->sb.seq;
pr_debug("set version = %llu\n", c->sb.version);
@@ -2698,7 +2698,7 @@ static ssize_t bch_pending_bdevs_cleanup(struct kobject *k,
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->sb.uuid;
+ char *set_uuid = c->set_uuid;

if (!memcmp(pdev_set_uuid, set_uuid, 16)) {
list_del(&pdev->list);
diff --git a/include/trace/events/bcache.h b/include/trace/events/bcache.h
index 0bddea663b3b..e41c611d6d3b 100644
--- a/include/trace/events/bcache.h
+++ b/include/trace/events/bcache.h
@@ -164,7 +164,7 @@ TRACE_EVENT(bcache_write,
),

TP_fast_assign(
- memcpy(__entry->uuid, c->sb.set_uuid, 16);
+ memcpy(__entry->uuid, c->set_uuid, 16);
__entry->inode = inode;
__entry->sector = bio->bi_iter.bi_sector;
__entry->nr_sector = bio->bi_iter.bi_size >> 9;
@@ -200,7 +200,7 @@ DECLARE_EVENT_CLASS(cache_set,
),

TP_fast_assign(
- memcpy(__entry->uuid, c->sb.set_uuid, 16);
+ memcpy(__entry->uuid, c->set_uuid, 16);
),

TP_printk("%pU", __entry->uuid)
--
2.26.2