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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 <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2016-12-07 09:42:05 -08:00 committed by Shaohua Li
parent d30dfeb9be
commit 5c88f403a5
1 changed files with 6 additions and 4 deletions
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10
drivers/md/raid5-cache.c
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@ -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;