[v3,02/16] bcache: add more accurate error information in read_super_common()
diff mbox series

Message ID 20200715143015.14957-3-colyli@suse.de
State New
Headers show
Series
  • bcache: extend bucket size to 32bit width
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Commit Message

Coly Li July 15, 2020, 2:30 p.m. UTC
From: Coly Li <colyli@suse.de>

The improperly set bucket or block size will trigger error in
read_super_common(). For large bucket size, a more accurate error message
for invalid bucket or block size is necessary.

This patch disassembles the combined if() checks into multiple single
if() check, and provide more accurate error message for each check
failure condition.

Signed-off-by: Coly Li <colyli@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 drivers/md/bcache/super.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

Patch
diff mbox series

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 9fe0e4dcfd1b..e162941122d4 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -79,11 +79,20 @@  static const char *read_super_common(struct cache_sb *sb,  struct block_device *
 	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)
+	err = "Bad block size (not power of 2)";
+	if (!is_power_of_2(sb->block_size))
+		goto err;
+
+	err = "Bad block size (larger than page size)";
+	if (sb->block_size > PAGE_SECTORS)
+		goto err;
+
+	err = "Bad bucket size (not power of 2)";
+	if (!is_power_of_2(sb->bucket_size))
+		goto err;
+
+	err = "Bad bucket size (smaller than page size)";
+	if (sb->bucket_size < PAGE_SECTORS)
 		goto err;
 
 	err = "Invalid superblock: device too small";