From 5c88f403a5d2bd75911c6faaacc9bea97ac7d121 Mon Sep 17 00:00:00 2001 From: Song Liu Date: Wed, 7 Dec 2016 09:42:05 -0800 Subject: [PATCH] md/raid5-cache: fix crc in rewrite_data_only_stripes() r5l_recovery_create_empty_meta_block() creates crc for the empty metablock. After the metablock is updated, we need clear the checksum before recalculate it. Shaohua: moved checksum calculation out of r5l_recovery_create_empty_meta_block. We should calculate it after all fields are updated. Signed-off-by: Song Liu Signed-off-by: Shaohua Li --- drivers/md/raid5-cache.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c index 7c732c5f87c9..aa990bde1fe2 100644 --- a/drivers/md/raid5-cache.c +++ b/drivers/md/raid5-cache.c @@ -1522,7 +1522,6 @@ r5l_recovery_create_empty_meta_block(struct r5l_log *log, sector_t pos, u64 seq) { struct r5l_meta_block *mb; - u32 crc; mb = page_address(page); clear_page(mb); @@ -1531,19 +1530,21 @@ r5l_recovery_create_empty_meta_block(struct r5l_log *log, mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); mb->seq = cpu_to_le64(seq); mb->position = cpu_to_le64(pos); - crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); - mb->checksum = cpu_to_le32(crc); } static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, u64 seq) { struct page *page; + struct r5l_meta_block *mb; page = alloc_page(GFP_KERNEL); if (!page) return -ENOMEM; r5l_recovery_create_empty_meta_block(log, page, pos, seq); + mb = page_address(page); + mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, + mb, PAGE_SIZE)); if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, REQ_OP_WRITE, WRITE_FUA, false)) { __free_page(page); @@ -2117,7 +2118,8 @@ r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log, } } mb->meta_size = cpu_to_le32(offset); - mb->checksum = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); + mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, + mb, PAGE_SIZE)); sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, REQ_OP_WRITE, WRITE_FUA, false); sh->log_start = ctx->pos; -- 2.39.5