Merge tag 'md-3.8' of git://neil.brown.name/md

Pull md update from Neil Brown:
 "Mostly just little fixes.  Probably biggest part is AVX accelerated
  RAID6 calculations."

* tag 'md-3.8' of git://neil.brown.name/md:
  md/raid5: add blktrace calls
  md/raid5: use async_tx_quiesce() instead of open-coding it.
  md: Use ->curr_resync as last completed request when cleanly aborting resync.
  lib/raid6: build proper files on corresponding arch
  lib/raid6: Add AVX2 optimized gen_syndrome functions
  lib/raid6: Add AVX2 optimized recovery functions
  md: Update checkpoint of resync/recovery based on time.
  md:Add place to update ->recovery_cp.
  md.c: re-indent various 'switch' statements.
  md: close race between removing and adding a device.
  md: removed unused variable in calc_sb_1_csm.

3 files changed, 171 insertions, 130 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4843b004c55..3db3d1b271f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1414,12 +1414,11 @@ static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
         unsigned long long newcsum;
         int size = 256 + le32_to_cpu(sb->max_dev)*2;
         __le32 *isuper = (__le32*)sb;
-        int i;
 
         disk_csum = sb->sb_csum;
         sb->sb_csum = 0;
         newcsum = 0;
-        for (i=0; size>=4; size -= 4 )
+        for (; size >= 4; size -= 4)
                 newcsum += le32_to_cpu(*isuper++);
 
         if (size == 2)
@@ -4753,6 +4752,8 @@ md_attr_store(struct kobject *kobj, struct attribute *attr,
         }
         mddev_get(mddev);
         spin_unlock(&all_mddevs_lock);
+        if (entry->store == new_dev_store)
+                flush_workqueue(md_misc_wq);
         rv = mddev_lock(mddev);
         if (!rv) {
                 rv = entry->store(mddev, page, length);
@@ -6346,24 +6347,23 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
          * Commands dealing with the RAID driver but not any
          * particular array:
          */
-        switch (cmd)
-        {
-                case RAID_VERSION:
-                        err = get_version(argp);
-                        goto done;
+        switch (cmd) {
+        case RAID_VERSION:
+                err = get_version(argp);
+                goto done;
 
-                case PRINT_RAID_DEBUG:
-                        err = 0;
-                        md_print_devices();
-                        goto done;
+        case PRINT_RAID_DEBUG:
+                err = 0;
+                md_print_devices();
+                goto done;
 
 #ifndef MODULE
-                case RAID_AUTORUN:
-                        err = 0;
-                        autostart_arrays(arg);
-                        goto done;
+        case RAID_AUTORUN:
+                err = 0;
+                autostart_arrays(arg);
+                goto done;
 #endif
-                default:;
+        default:;
         }
 
         /*
@@ -6398,6 +6398,10 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
                 goto abort;
         }
 
+        if (cmd == ADD_NEW_DISK)
+                /* need to ensure md_delayed_delete() has completed */
+                flush_workqueue(md_misc_wq);
+
         err = mddev_lock(mddev);
         if (err) {
                 printk(KERN_INFO 
@@ -6406,50 +6410,44 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
                 goto abort;
         }
 
-        switch (cmd)
-        {
-                case SET_ARRAY_INFO:
-                        {
-                                mdu_array_info_t info;
-                                if (!arg)
-                                        memset(&info, 0, sizeof(info));
-                                else if (copy_from_user(&info, argp, sizeof(info))) {
-                                        err = -EFAULT;
-                                        goto abort_unlock;
-                                }
-                                if (mddev->pers) {
-                                        err = update_array_info(mddev, &info);
-                                        if (err) {
-                                                printk(KERN_WARNING "md: couldn't update"
-                                                       " array info. %d\n", err);
-                                                goto abort_unlock;
-                                        }
-                                        goto done_unlock;
-                                }
-                                if (!list_empty(&mddev->disks)) {
-                                        printk(KERN_WARNING
-                                               "md: array %s already has disks!\n",
-                                               mdname(mddev));
-                                        err = -EBUSY;
-                                        goto abort_unlock;
-                                }
-                                if (mddev->raid_disks) {
-                                        printk(KERN_WARNING
-                                               "md: array %s already initialised!\n",
-                                               mdname(mddev));
-                                        err = -EBUSY;
-                                        goto abort_unlock;
-                                }
-                                err = set_array_info(mddev, &info);
-                                if (err) {
-                                        printk(KERN_WARNING "md: couldn't set"
-                                               " array info. %d\n", err);
-                                        goto abort_unlock;
-                                }
+        if (cmd == SET_ARRAY_INFO) {
+                mdu_array_info_t info;
+                if (!arg)
+                        memset(&info, 0, sizeof(info));
+                else if (copy_from_user(&info, argp, sizeof(info))) {
+                        err = -EFAULT;
+                        goto abort_unlock;
+                }
+                if (mddev->pers) {
+                        err = update_array_info(mddev, &info);
+                        if (err) {
+                                printk(KERN_WARNING "md: couldn't update"
+                                       " array info. %d\n", err);
+                                goto abort_unlock;
                         }
                         goto done_unlock;
-
-                default:;
+                }
+                if (!list_empty(&mddev->disks)) {
+                        printk(KERN_WARNING
+                               "md: array %s already has disks!\n",
+                               mdname(mddev));
+                        err = -EBUSY;
+                        goto abort_unlock;
+                }
+                if (mddev->raid_disks) {
+                        printk(KERN_WARNING
+                               "md: array %s already initialised!\n",
+                               mdname(mddev));
+                        err = -EBUSY;
+                        goto abort_unlock;
+                }
+                err = set_array_info(mddev, &info);
+                if (err) {
+                        printk(KERN_WARNING "md: couldn't set"
+                               " array info. %d\n", err);
+                        goto abort_unlock;
+                }
+                goto done_unlock;
         }
 
         /*
@@ -6468,52 +6466,51 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
         /*
          * Commands even a read-only array can execute:
          */
-        switch (cmd)
-        {
-                case GET_BITMAP_FILE:
-                        err = get_bitmap_file(mddev, argp);
-                        goto done_unlock;
+        switch (cmd) {
+        case GET_BITMAP_FILE:
+                err = get_bitmap_file(mddev, argp);
+                goto done_unlock;
 
-                case RESTART_ARRAY_RW:
-                        err = restart_array(mddev);
-                        goto done_unlock;
+        case RESTART_ARRAY_RW:
+                err = restart_array(mddev);
+                goto done_unlock;
 
-                case STOP_ARRAY:
-                        err = do_md_stop(mddev, 0, bdev);
-                        goto done_unlock;
+        case STOP_ARRAY:
+                err = do_md_stop(mddev, 0, bdev);
+                goto done_unlock;
 
-                case STOP_ARRAY_RO:
-                        err = md_set_readonly(mddev, bdev);
-                        goto done_unlock;
+        case STOP_ARRAY_RO:
+                err = md_set_readonly(mddev, bdev);
+                goto done_unlock;
 
-                case BLKROSET:
-                        if (get_user(ro, (int __user *)(arg))) {
-                                err = -EFAULT;
-                                goto done_unlock;
-                        }
-                        err = -EINVAL;
+        case BLKROSET:
+                if (get_user(ro, (int __user *)(arg))) {
+                        err = -EFAULT;
+                        goto done_unlock;
+                }
+                err = -EINVAL;
 
-                        /* if the bdev is going readonly the value of mddev->ro
-                         * does not matter, no writes are coming
-                         */
-                        if (ro)
-                                goto done_unlock;
+                /* if the bdev is going readonly the value of mddev->ro
+                 * does not matter, no writes are coming
+                 */
+                if (ro)
+                        goto done_unlock;
 
-                        /* are we are already prepared for writes? */
-                        if (mddev->ro != 1)
-                                goto done_unlock;
+                /* are we are already prepared for writes? */
+                if (mddev->ro != 1)
+                        goto done_unlock;
 
-                        /* transitioning to readauto need only happen for
-                         * arrays that call md_write_start
-                         */
-                        if (mddev->pers) {
-                                err = restart_array(mddev);
-                                if (err == 0) {
-                                        mddev->ro = 2;
-                                        set_disk_ro(mddev->gendisk, 0);
-                                }
+                /* transitioning to readauto need only happen for
+                 * arrays that call md_write_start
+                 */
+                if (mddev->pers) {
+                        err = restart_array(mddev);
+                        if (err == 0) {
+                                mddev->ro = 2;
+                                set_disk_ro(mddev->gendisk, 0);
                         }
-                        goto done_unlock;
+                }
+                goto done_unlock;
         }
 
         /*
@@ -6535,37 +6532,36 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
                 }
         }
 
-        switch (cmd)
+        switch (cmd) {
+        case ADD_NEW_DISK:
         {
-                case ADD_NEW_DISK:
-                {
-                        mdu_disk_info_t info;
-                        if (copy_from_user(&info, argp, sizeof(info)))
-                                err = -EFAULT;
-                        else
-                                err = add_new_disk(mddev, &info);
-                        goto done_unlock;
-                }
+                mdu_disk_info_t info;
+                if (copy_from_user(&info, argp, sizeof(info)))
+                        err = -EFAULT;
+                else
+                        err = add_new_disk(mddev, &info);
+                goto done_unlock;
+        }
 
-                case HOT_REMOVE_DISK:
-                        err = hot_remove_disk(mddev, new_decode_dev(arg));
-                        goto done_unlock;
+        case HOT_REMOVE_DISK:
+                err = hot_remove_disk(mddev, new_decode_dev(arg));
+                goto done_unlock;
 
-                case HOT_ADD_DISK:
-                        err = hot_add_disk(mddev, new_decode_dev(arg));
-                        goto done_unlock;
+        case HOT_ADD_DISK:
+                err = hot_add_disk(mddev, new_decode_dev(arg));
+                goto done_unlock;
 
-                case RUN_ARRAY:
-                        err = do_md_run(mddev);
-                        goto done_unlock;
+        case RUN_ARRAY:
+                err = do_md_run(mddev);
+                goto done_unlock;
 
-                case SET_BITMAP_FILE:
-                        err = set_bitmap_file(mddev, (int)arg);
-                        goto done_unlock;
+        case SET_BITMAP_FILE:
+                err = set_bitmap_file(mddev, (int)arg);
+                goto done_unlock;
 
-                default:
-                        err = -EINVAL;
-                        goto abort_unlock;
+        default:
+                err = -EINVAL;
+                goto abort_unlock;
         }
 
 done_unlock:
@@ -7184,6 +7180,7 @@ void md_done_sync(struct mddev *mddev, int blocks, int ok)
         wake_up(&mddev->recovery_wait);
         if (!ok) {
                 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+                set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
                 md_wakeup_thread(mddev->thread);
                 // stop recovery, signal do_sync ....
         }
@@ -7281,6 +7278,7 @@ EXPORT_SYMBOL_GPL(md_allow_write);
 
 #define SYNC_MARKS      10
 #define SYNC_MARK_STEP  (3*HZ)
+#define UPDATE_FREQUENCY (5*60*HZ)
 void md_do_sync(struct md_thread *thread)
 {
         struct mddev *mddev = thread->mddev;
@@ -7289,6 +7287,7 @@ void md_do_sync(struct md_thread *thread)
                  window;
         sector_t max_sectors,j, io_sectors;
         unsigned long mark[SYNC_MARKS];
+        unsigned long update_time;
         sector_t mark_cnt[SYNC_MARKS];
         int last_mark,m;
         struct list_head *tmp;
@@ -7448,6 +7447,7 @@ void md_do_sync(struct md_thread *thread)
         mddev->curr_resync_completed = j;
         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
         md_new_event(mddev);
+        update_time = jiffies;
 
         blk_start_plug(&plug);
         while (j < max_sectors) {
@@ -7459,6 +7459,7 @@ void md_do_sync(struct md_thread *thread)
                     ((mddev->curr_resync > mddev->curr_resync_completed &&
                       (mddev->curr_resync - mddev->curr_resync_completed)
                       > (max_sectors >> 4)) ||
+                     time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
                      (j - mddev->curr_resync_completed)*2
                      >= mddev->resync_max - mddev->curr_resync_completed
                             )) {
@@ -7466,6 +7467,10 @@ void md_do_sync(struct md_thread *thread)
                         wait_event(mddev->recovery_wait,
                                    atomic_read(&mddev->recovery_active) == 0);
                         mddev->curr_resync_completed = j;
+                        if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
+                            j > mddev->recovery_cp)
+                                mddev->recovery_cp = j;
+                        update_time = jiffies;
                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
                         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
                 }
@@ -7570,8 +7575,13 @@ void md_do_sync(struct md_thread *thread)
                                         printk(KERN_INFO
                                                "md: checkpointing %s of %s.\n",
                                                desc, mdname(mddev));
-                                        mddev->recovery_cp =
-                                                mddev->curr_resync_completed;
+                                        if (test_bit(MD_RECOVERY_ERROR,
+                                                &mddev->recovery))
+                                                mddev->recovery_cp =
+                                                        mddev->curr_resync_completed;
+                                        else
+                                                mddev->recovery_cp =
+                                                        mddev->curr_resync;
                                 }
                         } else
                                 mddev->recovery_cp = MaxSector;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1e2fc3d9c74..eca59c3074e 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -307,6 +307,7 @@ struct mddev {
          * REQUEST:  user-space has requested a sync (used with SYNC)
          * CHECK:    user-space request for check-only, no repair
          * RESHAPE:  A reshape is happening
+         * ERROR:    sync-action interrupted because io-error
          *
          * If neither SYNC or RESHAPE are set, then it is a recovery.
          */
@@ -320,6 +321,7 @@ struct mddev {
 #define MD_RECOVERY_CHECK       7
 #define MD_RECOVERY_RESHAPE     8
 #define MD_RECOVERY_FROZEN      9
+#define MD_RECOVERY_ERROR       10
 
         unsigned long                   recovery;
         /* If a RAID personality determines that recovery (of a particular
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 8d8555bf3e1..19d77a02663 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -53,6 +53,8 @@
 #include <linux/cpu.h>
 #include <linux/slab.h>
 #include <linux/ratelimit.h>
+#include <trace/events/block.h>
+
 #include "md.h"
 #include "raid5.h"
 #include "raid0.h"
@@ -182,6 +184,8 @@ static void return_io(struct bio *return_bi)
                 return_bi = bi->bi_next;
                 bi->bi_next = NULL;
                 bi->bi_size = 0;
+                trace_block_bio_complete(bdev_get_queue(bi->bi_bdev),
+                                         bi, 0);
                 bio_endio(bi, 0);
                 bi = return_bi;
         }
@@ -670,6 +674,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
                         bi->bi_next = NULL;
                         if (rrdev)
                                 set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
+                        trace_block_bio_remap(bdev_get_queue(bi->bi_bdev),
+                                              bi, disk_devt(conf->mddev->gendisk),
+                                              sh->dev[i].sector);
                         generic_make_request(bi);
                 }
                 if (rrdev) {
@@ -697,6 +704,9 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
                         rbi->bi_io_vec[0].bv_offset = 0;
                         rbi->bi_size = STRIPE_SIZE;
                         rbi->bi_next = NULL;
+                        trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev),
+                                              rbi, disk_devt(conf->mddev->gendisk),
+                                              sh->dev[i].sector);
                         generic_make_request(rbi);
                 }
                 if (!rdev && !rrdev) {
@@ -2853,8 +2863,10 @@ static void handle_stripe_dirtying(struct r5conf *conf,
         pr_debug("for sector %llu, rmw=%d rcw=%d\n",
                 (unsigned long long)sh->sector, rmw, rcw);
         set_bit(STRIPE_HANDLE, &sh->state);
-        if (rmw < rcw && rmw > 0)
+        if (rmw < rcw && rmw > 0) {
                 /* prefer read-modify-write, but need to get some data */
+                blk_add_trace_msg(conf->mddev->queue, "raid5 rmw %llu %d",
+                                  (unsigned long long)sh->sector, rmw);
                 for (i = disks; i--; ) {
                         struct r5dev *dev = &sh->dev[i];
                         if ((dev->towrite || i == sh->pd_idx) &&
@@ -2865,7 +2877,7 @@ static void handle_stripe_dirtying(struct r5conf *conf,
                                 if (
                                   test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) {
                                         pr_debug("Read_old block "
-                                                "%d for r-m-w\n", i);
+                                                 "%d for r-m-w\n", i);
                                         set_bit(R5_LOCKED, &dev->flags);
                                         set_bit(R5_Wantread, &dev->flags);
                                         s->locked++;
@@ -2875,8 +2887,10 @@ static void handle_stripe_dirtying(struct r5conf *conf,
                                 }
                         }
                 }
+        }
         if (rcw <= rmw && rcw > 0) {
                 /* want reconstruct write, but need to get some data */
+                int qread =0;
                 rcw = 0;
                 for (i = disks; i--; ) {
                         struct r5dev *dev = &sh->dev[i];
@@ -2895,12 +2909,17 @@ static void handle_stripe_dirtying(struct r5conf *conf,
                                         set_bit(R5_LOCKED, &dev->flags);
                                         set_bit(R5_Wantread, &dev->flags);
                                         s->locked++;
+                                        qread++;
                                 } else {
                                         set_bit(STRIPE_DELAYED, &sh->state);
                                         set_bit(STRIPE_HANDLE, &sh->state);
                                 }
                         }
                 }
+                if (rcw)
+                        blk_add_trace_msg(conf->mddev->queue, "raid5 rcw %llu %d %d %d",
+                                          (unsigned long long)sh->sector,
+                                          rcw, qread, test_bit(STRIPE_DELAYED, &sh->state));
         }
         /* now if nothing is locked, and if we have enough data,
          * we can start a write request
@@ -3222,10 +3241,7 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
 
                 }
         /* done submitting copies, wait for them to complete */
-        if (tx) {
-                async_tx_ack(tx);
-                dma_wait_for_async_tx(tx);
-        }
+        async_tx_quiesce(&tx);
 }
 
 /*
@@ -3901,6 +3917,8 @@ static void raid5_align_endio(struct bio *bi, int error)
         rdev_dec_pending(rdev, conf->mddev);
 
         if (!error && uptodate) {
+                trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev),
+                                         raid_bi, 0);
                 bio_endio(raid_bi, 0);
                 if (atomic_dec_and_test(&conf->active_aligned_reads))
                         wake_up(&conf->wait_for_stripe);
@@ -4005,6 +4023,9 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
                 atomic_inc(&conf->active_aligned_reads);
                 spin_unlock_irq(&conf->device_lock);
 
+                trace_block_bio_remap(bdev_get_queue(align_bi->bi_bdev),
+                                      align_bi, disk_devt(mddev->gendisk),
+                                      raid_bio->bi_sector);
                 generic_make_request(align_bi);
                 return 1;
         } else {
@@ -4079,6 +4100,7 @@ static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule)
         struct stripe_head *sh;
         struct mddev *mddev = cb->cb.data;
         struct r5conf *conf = mddev->private;
+        int cnt = 0;
 
         if (cb->list.next && !list_empty(&cb->list)) {
                 spin_lock_irq(&conf->device_lock);
@@ -4093,9 +4115,11 @@ static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule)
                         smp_mb__before_clear_bit();
                         clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state);
                         __release_stripe(conf, sh);
+                        cnt++;
                 }
                 spin_unlock_irq(&conf->device_lock);
         }
+        trace_block_unplug(mddev->queue, cnt, !from_schedule);
         kfree(cb);
 }
 
@@ -4353,6 +4377,8 @@ static void make_request(struct mddev *mddev, struct bio * bi)
                 if ( rw == WRITE )
                         md_write_end(mddev);
 
+                trace_block_bio_complete(bdev_get_queue(bi->bi_bdev),
+                                         bi, 0);
                 bio_endio(bi, 0);
         }
 }
@@ -4729,8 +4755,11 @@ static int  retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
                 handled++;
         }
         remaining = raid5_dec_bi_active_stripes(raid_bio);
-        if (remaining == 0)
+        if (remaining == 0) {
+                trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev),
+                                         raid_bio, 0);
                 bio_endio(raid_bio, 0);
+        }
         if (atomic_dec_and_test(&conf->active_aligned_reads))
                 wake_up(&conf->wait_for_stripe);
         return handled;