From: NeilBrown Date: Tue, 3 Oct 2006 08:15:45 +0000 (-0700) Subject: [PATCH] md: factor out part of raid10d into a separate function. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6814d5368d68341ec6b5e4ecd10ea5947130775a;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] md: factor out part of raid10d into a separate function. raid10d has toooo many nested block, so take the fix_read_error functionality out into a separate function. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 016ddb831c9..7bf5ce281c4 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1350,9 +1350,119 @@ static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio) * * 1. Retries failed read operations on working mirrors. * 2. Updates the raid superblock when problems encounter. - * 3. Performs writes following reads for array syncronising. + * 3. Performs writes following reads for array synchronising. */ +static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio) +{ + int sect = 0; /* Offset from r10_bio->sector */ + int sectors = r10_bio->sectors; + mdk_rdev_t*rdev; + while(sectors) { + int s = sectors; + int sl = r10_bio->read_slot; + int success = 0; + int start; + + if (s > (PAGE_SIZE>>9)) + s = PAGE_SIZE >> 9; + + rcu_read_lock(); + do { + int d = r10_bio->devs[sl].devnum; + rdev = rcu_dereference(conf->mirrors[d].rdev); + if (rdev && + test_bit(In_sync, &rdev->flags)) { + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + success = sync_page_io(rdev->bdev, + r10_bio->devs[sl].addr + + sect + rdev->data_offset, + s<<9, + conf->tmppage, READ); + rdev_dec_pending(rdev, mddev); + rcu_read_lock(); + if (success) + break; + } + sl++; + if (sl == conf->copies) + sl = 0; + } while (!success && sl != r10_bio->read_slot); + rcu_read_unlock(); + + if (!success) { + /* Cannot read from anywhere -- bye bye array */ + int dn = r10_bio->devs[r10_bio->read_slot].devnum; + md_error(mddev, conf->mirrors[dn].rdev); + break; + } + + start = sl; + /* write it back and re-read */ + rcu_read_lock(); + while (sl != r10_bio->read_slot) { + int d; + if (sl==0) + sl = conf->copies; + sl--; + d = r10_bio->devs[sl].devnum; + rdev = rcu_dereference(conf->mirrors[d].rdev); + if (rdev && + test_bit(In_sync, &rdev->flags)) { + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + atomic_add(s, &rdev->corrected_errors); + if (sync_page_io(rdev->bdev, + r10_bio->devs[sl].addr + + sect + rdev->data_offset, + s<<9, conf->tmppage, WRITE) + == 0) + /* Well, this device is dead */ + md_error(mddev, rdev); + rdev_dec_pending(rdev, mddev); + rcu_read_lock(); + } + } + sl = start; + while (sl != r10_bio->read_slot) { + int d; + if (sl==0) + sl = conf->copies; + sl--; + d = r10_bio->devs[sl].devnum; + rdev = rcu_dereference(conf->mirrors[d].rdev); + if (rdev && + test_bit(In_sync, &rdev->flags)) { + char b[BDEVNAME_SIZE]; + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + if (sync_page_io(rdev->bdev, + r10_bio->devs[sl].addr + + sect + rdev->data_offset, + s<<9, conf->tmppage, READ) == 0) + /* Well, this device is dead */ + md_error(mddev, rdev); + else + printk(KERN_INFO + "raid10:%s: read error corrected" + " (%d sectors at %llu on %s)\n", + mdname(mddev), s, + (unsigned long long)sect+ + rdev->data_offset, + bdevname(rdev->bdev, b)); + + rdev_dec_pending(rdev, mddev); + rcu_read_lock(); + } + } + rcu_read_unlock(); + + sectors -= s; + sect += s; + } +} + static void raid10d(mddev_t *mddev) { r10bio_t *r10_bio; @@ -1413,105 +1523,12 @@ static void raid10d(mddev_t *mddev) * This is all done synchronously while the array is * frozen. */ - int sect = 0; /* Offset from r10_bio->sector */ - int sectors = r10_bio->sectors; - freeze_array(conf); - if (mddev->ro == 0) while(sectors) { - int s = sectors; - int sl = r10_bio->read_slot; - int success = 0; - - if (s > (PAGE_SIZE>>9)) - s = PAGE_SIZE >> 9; - - rcu_read_lock(); - do { - int d = r10_bio->devs[sl].devnum; - rdev = rcu_dereference(conf->mirrors[d].rdev); - if (rdev && - test_bit(In_sync, &rdev->flags)) { - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - success = sync_page_io(rdev->bdev, - r10_bio->devs[sl].addr + - sect + rdev->data_offset, - s<<9, - conf->tmppage, READ); - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - if (success) - break; - } - sl++; - if (sl == conf->copies) - sl = 0; - } while (!success && sl != r10_bio->read_slot); - rcu_read_unlock(); - - if (success) { - int start = sl; - /* write it back and re-read */ - rcu_read_lock(); - while (sl != r10_bio->read_slot) { - int d; - if (sl==0) - sl = conf->copies; - sl--; - d = r10_bio->devs[sl].devnum; - rdev = rcu_dereference(conf->mirrors[d].rdev); - if (rdev && - test_bit(In_sync, &rdev->flags)) { - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - atomic_add(s, &rdev->corrected_errors); - if (sync_page_io(rdev->bdev, - r10_bio->devs[sl].addr + - sect + rdev->data_offset, - s<<9, conf->tmppage, WRITE) == 0) - /* Well, this device is dead */ - md_error(mddev, rdev); - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - sl = start; - while (sl != r10_bio->read_slot) { - int d; - if (sl==0) - sl = conf->copies; - sl--; - d = r10_bio->devs[sl].devnum; - rdev = rcu_dereference(conf->mirrors[d].rdev); - if (rdev && - test_bit(In_sync, &rdev->flags)) { - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - if (sync_page_io(rdev->bdev, - r10_bio->devs[sl].addr + - sect + rdev->data_offset, - s<<9, conf->tmppage, READ) == 0) - /* Well, this device is dead */ - md_error(mddev, rdev); - else - printk(KERN_INFO "raid10:%s: read error corrected (%d sectors at %llu on %s)\n", - mdname(mddev), s, (unsigned long long)(sect+rdev->data_offset), bdevname(rdev->bdev, b)); - - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - rcu_read_unlock(); - } else { - /* Cannot read from anywhere -- bye bye array */ - md_error(mddev, conf->mirrors[r10_bio->devs[r10_bio->read_slot].devnum].rdev); - break; - } - sectors -= s; - sect += s; + if (mddev->ro == 0) { + freeze_array(conf); + fix_read_error(conf, mddev, r10_bio); + unfreeze_array(conf); } - unfreeze_array(conf); - bio = r10_bio->devs[r10_bio->read_slot].bio; r10_bio->devs[r10_bio->read_slot].bio = mddev->ro ? IO_BLOCKED : NULL;