The patch titled
md: factor out part of raid10d into a separate function.
has been added to the -mm tree. Its filename is
md-factor-out-part-of-raid10d-into-a-separate-function.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: md: factor out part of raid10d into a separate function.
From: NeilBrown <neilb@xxxxxxx>
raid10d has toooo many nested block, so take the fix_read_error functionality
out into a separate function.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/raid10.c | 213 ++++++++++++++++++++++--------------------
1 file changed, 115 insertions(+), 98 deletions(-)
diff -puN drivers/md/raid10.c~md-factor-out-part-of-raid10d-into-a-separate-function drivers/md/raid10.c
--- a/drivers/md/raid10.c~md-factor-out-part-of-raid10d-into-a-separate-function
+++ a/drivers/md/raid10.c
@@ -1350,9 +1350,119 @@ static void recovery_request_write(mddev
*
* 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;
_
Patches currently in -mm which might be from neilb@xxxxxxx are
ext3-avoid-triggering-ext3_error-on-bad-nfs-file-handle.patch
knfsd-fix-stale-file-handle-problem-with-subtree_checking.patch
knfsd-knfsd-add-some-missing-newlines-in-printks.patch
knfsd-knfsd-remove-an-unused-variable-from-e_show.patch
knfsd-knfsd-remove-an-unused-variable-from-auth_unix_lookup.patch
knfsd-add-a-callback-for-when-last-rpc-thread-finishes.patch
knfsd-add-a-callback-for-when-last-rpc-thread-finishes-tidy.patch
knfsd-be-more-selective-in-which-sockets-lockd-listens-on.patch
knfsd-remove-nfsd_versbits-as-intermediate-storage-for-desired-versions.patch
knfsd-separate-out-some-parts-of-nfsd_svc-which-start-nfs-servers.patch
knfsd-separate-out-some-parts-of-nfsd_svc-which-start-nfs-servers-tweaks.patch
knfsd-define-new-nfsdfs-file-portlist-contains-list-of-ports.patch
knfsd-define-new-nfsdfs-file-portlist-contains-list-of-ports-tidy.patch
knfsd-define-new-nfsdfs-file-portlist-contains-list-of-ports-fix.patch
knfsd-allow-sockets-to-be-passed-to-nfsd-via-portlist.patch
knfsd-use-seq_start_token-instead-of-hardcoded-magic-void1.patch
knfsd-have-ext2-reject-file-handles-with-bad-inode-numbers-early.patch
knfsd-have-ext2-reject-file-handles-with-bad-inode-numbers-early-tidy.patch
knfsd-make-ext3-reject-filehandles-referring-to-invalid-inode-numbers.patch
knfsd-make-ext3-reject-filehandles-referring-to-invalid-inode-numbers-tidy.patch
knfsd-drop-serv-option-to-svc_recv-and-svc_process.patch
knfsd-drop-serv-option-to-svc_recv-and-svc_process-nfs-callback-fix-nfs-callback-fix.patch
knfsd-check-return-value-of-lockd_up-in-write_ports.patch
knfsd-move-makesock-failed-warning-into-make_socks.patch
knfsd-correctly-handle-error-condition-from-lockd_up.patch
knfsd-move-tempsock-aging-to-a-timer.patch
knfsd-move-tempsock-aging-to-a-timer-tidy.patch
knfsd-convert-sk_inuse-to-atomic_t.patch
knfsd-use-new-lock-for-svc_sock-deferred-list.patch
knfsd-convert-sk_reserved-to-atomic_t.patch
knfsd-test-and-set-sk_busy-atomically.patch
knfsd-split-svc_serv-into-pools.patch
knfsd-add-svc_get.patch
knfsd-add-svc_set_num_threads.patch
knfsd-use-svc_set_num_threads-to-manage-threads-in-knfsd.patch
knfsd-make-rpc-threads-pools-numa-aware.patch
knfsd-allow-admin-to-set-nthreads-per-node.patch
md-the-scheduled-removal-of-the-start_array-ioctl-for-md.patch
md-fix-a-comment-that-is-wrong-in-raid5h.patch
md-factor-out-part-of-raid1d-into-a-separate-function.patch
md-factor-out-part-of-raid10d-into-a-separate-function.patch
md-replace-magic-numbers-in-sb_dirty-with-well-defined-bit-flags.patch
md-remove-the-working_disks-and-failed_disks-from-raid5-state-data.patch
md-remove-working_disks-from-raid10-state.patch
md-remove-working_disks-from-raid1-state-data.patch
md-improve-locking-around-error-handling.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
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