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md/r5cache: handle R5LOG_PAYLOAD_FLUSH in recovery 

This patch adds handling of R5LOG_PAYLOAD_FLUSH in journal recovery.
Next patch will add logic that generate R5LOG_PAYLOAD_FLUSH on flush
finish.

When R5LOG_PAYLOAD_FLUSH is seen in recovery, pending data and parity
will be dropped from recovery. This will reduce the number of stripes
to replay, and thus accelerate the recovery process.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2017-03-07 17:44:21 -08:00 committed by Shaohua Li
parent ba903a3ea4
commit 2d4f468753
1 changed files with 41 additions and 6 deletions
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47
drivers/md/raid5-cache.c
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@ -1959,6 +1959,7 @@ r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log,
sector_t log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS);
struct page *page;
struct r5l_payload_data_parity *payload;
struct r5l_payload_flush *payload_flush;
page = alloc_page(GFP_KERNEL);
if (!page)
@ -1966,6 +1967,7 @@ r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log,
while (mb_offset < le32_to_cpu(mb->meta_size)) {
payload = (void *)mb + mb_offset;
payload_flush = (void *)mb + mb_offset;
if (payload->header.type == R5LOG_PAYLOAD_DATA) {
if (r5l_recovery_verify_data_checksum(
@ -1984,15 +1986,23 @@ r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log,
BLOCK_SECTORS),
payload->checksum[1]) < 0)
goto mismatch;
} else /* not R5LOG_PAYLOAD_DATA or R5LOG_PAYLOAD_PARITY */
} else if (payload->header.type == R5LOG_PAYLOAD_FLUSH) {
/* nothing to do for R5LOG_PAYLOAD_FLUSH here */
} else /* not R5LOG_PAYLOAD_DATA/PARITY/FLUSH */
goto mismatch;
log_offset = r5l_ring_add(log, log_offset,
le32_to_cpu(payload->size));
if (payload->header.type == R5LOG_PAYLOAD_FLUSH) {
mb_offset += sizeof(struct r5l_payload_flush) +
le32_to_cpu(payload_flush->size);
} else {
/* DATA or PARITY payload */
log_offset = r5l_ring_add(log, log_offset,
le32_to_cpu(payload->size));
mb_offset += sizeof(struct r5l_payload_data_parity) +
sizeof(__le32) *
(le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9));
}
mb_offset += sizeof(struct r5l_payload_data_parity) +
sizeof(__le32) *
(le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9));
}
put_page(page);
@ -2020,6 +2030,7 @@ r5c_recovery_analyze_meta_block(struct r5l_log *log,
struct r5conf *conf = mddev->private;
struct r5l_meta_block *mb;
struct r5l_payload_data_parity *payload;
struct r5l_payload_flush *payload_flush;
int mb_offset;
sector_t log_offset;
sector_t stripe_sect;
@ -2045,6 +2056,30 @@ r5c_recovery_analyze_meta_block(struct r5l_log *log,
int dd;
payload = (void *)mb + mb_offset;
payload_flush = (void *)mb + mb_offset;
if (payload->header.type == R5LOG_PAYLOAD_FLUSH) {
int i, count;
count = le32_to_cpu(payload_flush->size) / sizeof(__le64);
for (i = 0; i < count; ++i) {
stripe_sect = le64_to_cpu(payload_flush->flush_stripes[i]);
sh = r5c_recovery_lookup_stripe(cached_stripe_list,
stripe_sect);
if (sh) {
WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state));
r5l_recovery_reset_stripe(sh);
list_del_init(&sh->lru);
raid5_release_stripe(sh);
}
}
mb_offset += sizeof(struct r5l_payload_flush) +
le32_to_cpu(payload_flush->size);
continue;
}
/* DATA or PARITY payload */
stripe_sect = (payload->header.type == R5LOG_PAYLOAD_DATA) ?
raid5_compute_sector(
conf, le64_to_cpu(payload->location), 0, &dd,