From: Ming Lei <tom.leiming@gmail.com>
To: Shaohua Li <shli@kernel.org>, Jens Axboe <axboe@fb.com>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
linux-block@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>, NeilBrown <neilb@suse.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Subject: [PATCH 06/17] md: raid1/raid10: borrow .bi_error as pre-allocated page index
Date: Thu, 16 Feb 2017 19:45:36 +0800 [thread overview]
Message-ID: <1487245547-24384-7-git-send-email-tom.leiming@gmail.com> (raw)
In-Reply-To: <1487245547-24384-1-git-send-email-tom.leiming@gmail.com>
Before bio is submitted, it is safe to borrow .bi_error. This
patch uses .bi_error as index of pre-allocated page in bio, so
that we can avoid to mess .bi_vcnt. Especially the old way
will not work any more when multipage bvec is introduced.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
drivers/md/raid1.c | 12 ++++++++++--
drivers/md/raid10.c | 14 ++++++++++----
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index c4791fbd69ac..8904a9149671 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2811,13 +2811,14 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
len = sync_blocks<<9;
}
+ /* borrow .bi_error as pre-allocated page index */
for (i = 0 ; i < conf->raid_disks * 2; i++) {
bio = r1_bio->bios[i];
if (bio->bi_end_io) {
- page = mdev_get_page_from_bio(bio, bio->bi_vcnt);
+ page = mdev_get_page_from_bio(bio, bio->bi_error++);
if (bio_add_page(bio, page, len, 0) == 0) {
/* stop here */
- mdev_put_page_to_bio(bio, bio->bi_vcnt, page);
+ mdev_put_page_to_bio(bio, --bio->bi_error, page);
while (i > 0) {
i--;
bio = r1_bio->bios[i];
@@ -2836,6 +2837,13 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
sync_blocks -= (len>>9);
} while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES);
bio_full:
+ /* return .bi_error back to bio */
+ for (i = 0 ; i < conf->raid_disks * 2; i++) {
+ bio = r1_bio->bios[i];
+ if (bio->bi_end_io)
+ bio->bi_error = 0;
+ }
+
r1_bio->sectors = nr_sectors;
if (mddev_is_clustered(mddev) &&
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b7dfbca869a3..9cfc22cd1330 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3348,7 +3348,6 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
bio = r10_bio->devs[i].bio;
bio_reset(bio);
- bio->bi_error = -EIO;
rcu_read_lock();
rdev = rcu_dereference(conf->mirrors[d].rdev);
if (rdev == NULL || test_bit(Faulty, &rdev->flags)) {
@@ -3392,7 +3391,6 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
/* Need to set up for writing to the replacement */
bio = r10_bio->devs[i].repl_bio;
bio_reset(bio);
- bio->bi_error = -EIO;
sector = r10_bio->devs[i].addr;
bio->bi_next = biolist;
@@ -3435,14 +3433,15 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
len = (max_sector - sector_nr) << 9;
if (len == 0)
break;
+ /* borrow .bi_error as pre-allocated page index */
for (bio= biolist ; bio ; bio=bio->bi_next) {
struct bio *bio2;
- page = mdev_get_page_from_bio(bio, bio->bi_vcnt);
+ page = mdev_get_page_from_bio(bio, bio->bi_error++);
if (bio_add_page(bio, page, len, 0))
continue;
/* stop here */
- mdev_put_page_to_bio(bio, bio->bi_vcnt, page);
+ mdev_put_page_to_bio(bio, --bio->bi_error, page);
for (bio2 = biolist;
bio2 && bio2 != bio;
bio2 = bio2->bi_next) {
@@ -3456,6 +3455,13 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
sector_nr += len>>9;
} while (biolist->bi_vcnt < RESYNC_PAGES);
bio_full:
+ /* return .bi_error back to bio, and set resync's as -EIO */
+ for (bio= biolist ; bio ; bio=bio->bi_next)
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ bio->bi_error = -EIO;
+ else
+ bio->bi_error = 0;
+
r10_bio->sectors = nr_sectors;
while (biolist) {
--
2.7.4
next prev parent reply other threads:[~2017-02-16 11:51 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-16 11:45 [PATCH 00/17] md: cleanup on direct access to bvec table Ming Lei
2017-02-16 11:45 ` [PATCH 01/17] block: introduce bio_segments_all() Ming Lei
2017-02-16 11:45 ` [PATCH 02/17] block: introduce bio_remove_last_page() Ming Lei
2017-02-16 12:08 ` Johannes Thumshirn
2017-02-16 13:30 ` Ming Lei
2017-02-16 13:40 ` Johannes Thumshirn
2017-02-16 13:59 ` Ming Lei
2017-02-16 14:10 ` Johannes Thumshirn
2017-02-16 11:45 ` [PATCH 03/17] md: raid1/raid10: use bio_remove_last_page() Ming Lei
2017-02-16 11:45 ` [PATCH 04/17] md: introduce helpers for dealing with fetch/store preallocated pages in bio Ming Lei
2017-02-16 11:45 ` [PATCH 05/17] md: raid1/raid10: use the introduced helpers Ming Lei
2017-02-16 11:45 ` Ming Lei [this message]
2017-02-16 11:45 ` [PATCH 07/17] md: raid1/raid10: don't use .bi_vcnt to check if all pages are added Ming Lei
2017-02-16 11:45 ` [PATCH 08/17] md: raid1: simplify r1buf_pool_free() Ming Lei
2017-02-16 11:45 ` [PATCH 09/17] md: raid1/raid10: use bio helper in *_pool_free Ming Lei
2017-02-16 11:45 ` [PATCH 10/17] md: raid1: remove direct access to bvec table in fix_sync_read_error Ming Lei
2017-02-16 11:45 ` [PATCH 11/17] md: raid1: use bio helper in process_checks() Ming Lei
2017-02-16 11:45 ` [PATCH 12/17] md: raid1: avoid direct access to bvec table " Ming Lei
2017-02-17 8:33 ` kbuild test robot
2017-02-16 11:45 ` [PATCH 13/17] md: raid1: use bio_segments_all() Ming Lei
2017-02-16 12:35 ` Johannes Thumshirn
2017-02-16 13:32 ` Ming Lei
2017-02-16 13:34 ` Johannes Thumshirn
2017-02-16 13:38 ` Ming Lei
2017-02-16 11:45 ` [PATCH 14/17] md: raid10: avoid direct access to bvec table in sync_request_write() Ming Lei
2017-02-16 11:45 ` [PATCH 15/17] md: raid10: avoid direct access to bvec table in fix_recovery_read_error Ming Lei
2017-02-16 11:45 ` [PATCH 16/17] md: raid10: avoid direct access to bvec table in reshape_request Ming Lei
2017-02-16 11:45 ` [PATCH 17/17] md: raid10: avoid direct access to bvec table in handle_reshape_read_error Ming Lei
2017-02-16 22:16 ` [PATCH 00/17] md: cleanup on direct access to bvec table Shaohua Li
2017-02-17 1:25 ` Ming Lei
2017-02-17 4:16 ` Shaohua Li
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