bcache: add set_uuid in struct cache_set

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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 7ffe6b2..94a62ac 100644 (file)
--- 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 336f439..0ccc1b0 100644 (file)
--- 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 1eb55a6..b84487b 100644 (file)
--- 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;
 }
 
@@ -1631,7 +1631,7 @@ 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);
 
@@ -1684,7 +1684,7 @@ 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);
@@ -1754,7 +1754,7 @@ 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)) {
                /*
@@ -1861,7 +1861,7 @@ 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;
@@ -2144,7 +2144,7 @@ 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";
 
@@ -2162,7 +2162,7 @@ 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;
 
@@ -2187,7 +2187,7 @@ found:
         */
        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);
@@ -2702,7 +2702,7 @@ 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 0bddea6..e41c611 100644 (file)
--- 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)