diff options
Diffstat (limited to 'drivers/md/bcache/super.c')
-rw-r--r-- | drivers/md/bcache/super.c | 97 |
1 files changed, 64 insertions, 33 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 7415ce647479..5248bca5e2ed 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -782,7 +782,9 @@ static void bcache_device_free(struct bcache_device *d) bcache_device_detach(d); if (disk) { - if (disk->flags & GENHD_FL_UP) + bool disk_added = (disk->flags & GENHD_FL_UP) != 0; + + if (disk_added) del_gendisk(disk); if (disk->queue) @@ -790,7 +792,8 @@ static void bcache_device_free(struct bcache_device *d) ida_simple_remove(&bcache_device_idx, first_minor_to_idx(disk->first_minor)); - put_disk(disk); + if (disk_added) + put_disk(disk); } bioset_exit(&d->bio_split); @@ -1232,6 +1235,9 @@ static void cached_dev_free(struct closure *cl) 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 (!IS_ERR_OR_NULL(dc->bdev)) blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); @@ -1697,7 +1703,7 @@ void bch_cache_set_unregister(struct cache_set *c) } #define alloc_bucket_pages(gfp, c) \ - ((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c)))) + ((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(bucket_pages(c)))) struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) { @@ -2017,7 +2023,14 @@ found: sysfs_create_link(&c->kobj, &ca->kobj, buf)) goto err; - if (ca->sb.seq > c->sb.seq) { + /* + * 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; @@ -2297,29 +2310,35 @@ static bool bch_is_open(struct block_device *bdev) static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, const char *buffer, size_t size) { - ssize_t ret = -EINVAL; - const char *err = "cannot allocate memory"; + const char *err; char *path = NULL; - struct cache_sb *sb = NULL; + struct cache_sb *sb; struct block_device *bdev = NULL; - struct page *sb_page = NULL; + struct page *sb_page; + ssize_t ret; + 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) - return -EBUSY; + 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, @@ -2336,57 +2355,69 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, if (!IS_ERR(bdev)) bdput(bdev); if (attr == &ksysfs_register_quiet) - goto quiet_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); if (err) - goto err_close; + goto out_blkdev_put; err = "failed to register device"; 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); ret = register_bdev(sb, sb_page, bdev, dc); mutex_unlock(&bch_register_lock); /* blkdev_put() will be called in cached_dev_free() */ - if (ret < 0) - goto err; + if (ret < 0) { + bdev = NULL; + goto out_put_sb_page; + } } else { struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); if (!ca) - goto err_close; + goto out_put_sb_page; /* blkdev_put() will be called in bch_cache_release() */ - if (register_cache(sb, sb_page, bdev, ca) != 0) - goto err; + if (register_cache(sb, sb_page, bdev, ca) != 0) { + bdev = NULL; + goto out_put_sb_page; + } } -quiet_out: - ret = size; -out: - if (sb_page) - put_page(sb_page); + + put_page(sb_page); +done: kfree(sb); kfree(path); module_put(THIS_MODULE); + return size; + +out_put_sb_page: + put_page(sb_page); +out_blkdev_put: + if (bdev) + 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", path?path:"", err); return ret; - -err_close: - blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); -err: - pr_info("error %s: %s", path, err); - goto out; } static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) |