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authorColy Li <colyli@suse.de>2020-07-25 20:00:23 +0800
committerJens Axboe <axboe@kernel.dk>2020-07-25 07:38:20 -0600
commit5b21403c7f48b7d2312b302ab9e8468ec2c711a3 (patch)
tree3230a9f33bdb304b43d0a6bba64b48260171e311 /drivers/md
parent7a1481267999c02abf4a624515c1b5c7c1fccbd6 (diff)
bcache: add read_super_common() to read major part of super block
Later patches will introduce feature set bits to on-disk super block and increase super block version. Current code in read_super() which reads common part of super block for version BCACHE_SB_VERSION_CDEV and version BCACHE_SB_VERSION_CDEV_WITH_UUID will be shared with the new version. Therefore this patch moves the reusable part into read_super_common(), this preparation patch will make later patches more simplier and only focus on new feature set bits. Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/super.c111
1 files changed, 63 insertions, 48 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 0f90616dc8d3..a234c4c9c89b 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -59,6 +59,67 @@ struct workqueue_struct *bch_journal_wq;
/* Superblock */
+static const char *read_super_common(struct cache_sb *sb, struct block_device *bdev,
+ struct cache_sb_disk *s)
+{
+ const char *err;
+ unsigned int i;
+
+ sb->nbuckets = le64_to_cpu(s->nbuckets);
+ 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);
+
+ 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/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 = "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)
{
@@ -133,55 +194,9 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
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);
-
- 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)
- goto err;
-
- err = "Not enough buckets";
- if (sb->nbuckets < 1 << 7)
- 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 = "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)
+ err = read_super_common(sb, bdev, s);
+ if (err)
goto err;
-
break;
default:
err = "Unsupported superblock version";