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Commit 3fd880af authored by JackieLiu's avatar JackieLiu Committed by Shaohua Li
Browse files

raid5-cache: restrict the use area of the log_offset variable 



We can calculate this offset by using ctx->meta_total_blocks,
without passing in from the function

Signed-off-by: default avatarJackieLiu <liuyun01@kylinos.cn>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent cc6167b4

drivers/md/raid5-cache.c

+8 −11
Original line number Diff line number Diff line
@@ -895,7 +895,7 @@ static int r5l_read_meta_block(struct r5l_log *log, 
static int r5l_recovery_flush_one_stripe(struct r5l_log *log,

					 struct r5l_recovery_ctx *ctx,

					 sector_t stripe_sect,

					 int *offset, sector_t *log_offset)

					 int *offset)

{

	struct r5conf *conf = log->rdev->mddev->private;

	struct stripe_head *sh;
@@ -904,6 +904,8 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 


	sh = raid5_get_active_stripe(conf, stripe_sect, 0, 0, 0);

	while (1) {

		sector_t log_offset = r5l_ring_add(log, ctx->pos,

				ctx->meta_total_blocks);

		payload = page_address(ctx->meta_page) + *offset;



		if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) {
@@ -911,16 +913,15 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 
					     le64_to_cpu(payload->location), 0,

					     &disk_index, sh);



			sync_page_io(log->rdev, *log_offset, PAGE_SIZE,

			sync_page_io(log->rdev, log_offset, PAGE_SIZE,

				     sh->dev[disk_index].page, REQ_OP_READ, 0,

				     false);

			sh->dev[disk_index].log_checksum =

				le32_to_cpu(payload->checksum[0]);

			set_bit(R5_Wantwrite, &sh->dev[disk_index].flags);

			ctx->meta_total_blocks += BLOCK_SECTORS;

		} else {

			disk_index = sh->pd_idx;

			sync_page_io(log->rdev, *log_offset, PAGE_SIZE,

			sync_page_io(log->rdev, log_offset, PAGE_SIZE,

				     sh->dev[disk_index].page, REQ_OP_READ, 0,

				     false);

			sh->dev[disk_index].log_checksum =
@@ -930,7 +931,7 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 
			if (sh->qd_idx >= 0) {

				disk_index = sh->qd_idx;

				sync_page_io(log->rdev,

					     r5l_ring_add(log, *log_offset, BLOCK_SECTORS),

					     r5l_ring_add(log, log_offset, BLOCK_SECTORS),

					     PAGE_SIZE, sh->dev[disk_index].page,

					     REQ_OP_READ, 0, false);

				sh->dev[disk_index].log_checksum =
@@ -938,11 +939,9 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 
				set_bit(R5_Wantwrite,

					&sh->dev[disk_index].flags);

			}

			ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded;

		}



		*log_offset = r5l_ring_add(log, *log_offset,

					   le32_to_cpu(payload->size));

		ctx->meta_total_blocks += le32_to_cpu(payload->size);

		*offset += sizeof(struct r5l_payload_data_parity) +

			sizeof(__le32) *

			(le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9));
@@ -999,12 +998,10 @@ static int r5l_recovery_flush_one_meta(struct r5l_log *log, 
	struct r5l_payload_data_parity *payload;

	struct r5l_meta_block *mb;

	int offset;

	sector_t log_offset;

	sector_t stripe_sector;



	mb = page_address(ctx->meta_page);

	offset = sizeof(struct r5l_meta_block);

	log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS);



	while (offset < le32_to_cpu(mb->meta_size)) {

		int dd;
@@ -1013,7 +1010,7 @@ static int r5l_recovery_flush_one_meta(struct r5l_log *log, 
		stripe_sector = raid5_compute_sector(conf,

						     le64_to_cpu(payload->location), 0, &dd, NULL);

		if (r5l_recovery_flush_one_stripe(log, ctx, stripe_sector,

						  &offset, &log_offset))

						  &offset))

			return -EINVAL;

	}

	return 0;