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: JackieLiu <liuyun01@kylinos.cn>
Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index a227a9f..2e270e6 100644 (file)
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -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;