Re: [PATCH v2 02/17] bcache: add read_super_basic() to read major part of super block

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On 7/15/20 7:45 AM, Coly Li wrote:
Later patches will introduce feature set bits to on-disk super block and
increase super block version. Current code in read_super() which reads
basic 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_basic(),
this preparation patch will make later patches more simplier and only
focus on new feature set bits.

Signed-off-by: Coly Li <colyli@xxxxxxx>
---
  drivers/md/bcache/super.c | 111 +++++++++++++++++++++-----------------
  1 file changed, 63 insertions(+), 48 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 7aa1d6737f66..74681fb92158 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_basic(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_basic(sb, bdev, s);
+		if (err)
  			goto err;
-
  		break;
  	default:
  		err = "Unsupported superblock version";

read_super_common(), maybe?
'basic' sounds more like a degraded functionality...

Cheers,

Hannes
--
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@xxxxxxx                               +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer



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