Merge tag 'for-6.5/block-2023-06-23' of git://git.kernel.dk/linux

Pull block updates from Jens Axboe:

 - NVMe pull request via Keith:
      - Various cleanups all around (Irvin, Chaitanya, Christophe)
      - Better struct packing (Christophe JAILLET)
      - Reduce controller error logs for optional commands (Keith)
      - Support for >=64KiB block sizes (Daniel Gomez)
      - Fabrics fixes and code organization (Max, Chaitanya, Daniel
        Wagner)

 - bcache updates via Coly:
      - Fix a race at init time (Mingzhe Zou)
      - Misc fixes and cleanups (Andrea, Thomas, Zheng, Ye)

 - use page pinning in the block layer for dio (David)

 - convert old block dio code to page pinning (David, Christoph)

 - cleanups for pktcdvd (Andy)

 - cleanups for rnbd (Guoqing)

 - use the unchecked __bio_add_page() for the initial single page
   additions (Johannes)

 - fix overflows in the Amiga partition handling code (Michael)

 - improve mq-deadline zoned device support (Bart)

 - keep passthrough requests out of the IO schedulers (Christoph, Ming)

 - improve support for flush requests, making them less special to deal
   with (Christoph)

 - add bdev holder ops and shutdown methods (Christoph)

 - fix the name_to_dev_t() situation and use cases (Christoph)

 - decouple the block open flags from fmode_t (Christoph)

 - ublk updates and cleanups, including adding user copy support (Ming)

 - BFQ sanity checking (Bart)

 - convert brd from radix to xarray (Pankaj)

 - constify various structures (Thomas, Ivan)

 - more fine grained persistent reservation ioctl capability checks
   (Jingbo)

 - misc fixes and cleanups (Arnd, Azeem, Demi, Ed, Hengqi, Hou, Jan,
   Jordy, Li, Min, Yu, Zhong, Waiman)

* tag 'for-6.5/block-2023-06-23' of git://git.kernel.dk/linux: (266 commits)
  scsi/sg: don't grab scsi host module reference
  ext4: Fix warning in blkdev_put()
  block: don't return -EINVAL for not found names in devt_from_devname
  cdrom: Fix spectre-v1 gadget
  block: Improve kernel-doc headers
  blk-mq: don't insert passthrough request into sw queue
  bsg: make bsg_class a static const structure
  ublk: make ublk_chr_class a static const structure
  aoe: make aoe_class a static const structure
  block/rnbd: make all 'class' structures const
  block: fix the exclusive open mask in disk_scan_partitions
  block: add overflow checks for Amiga partition support
  block: change all __u32 annotations to __be32 in affs_hardblocks.h
  block: fix signed int overflow in Amiga partition support
  block: add capacity validation in bdev_add_partition()
  block: fine-granular CAP_SYS_ADMIN for Persistent Reservation
  block: disallow Persistent Reservation on partitions
  reiserfs: fix blkdev_put() warning from release_journal_dev()
  block: fix wrong mode for blkdev_get_by_dev() from disk_scan_partitions()
  block: document the holder argument to blkdev_get_by_path
  ...

1 files changed, 60 insertions, 8 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 9ea285fbc4a6..6615abf54d3f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5966,6 +5966,19 @@ out:
 	return ret;
 }
 
+static bool reshape_inprogress(struct mddev *mddev)
+{
+	return test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
+	       test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
+	       !test_bit(MD_RECOVERY_DONE, &mddev->recovery) &&
+	       !test_bit(MD_RECOVERY_INTR, &mddev->recovery);
+}
+
+static bool reshape_disabled(struct mddev *mddev)
+{
+	return is_md_suspended(mddev) || !md_is_rdwr(mddev);
+}
+
 static enum stripe_result make_stripe_request(struct mddev *mddev,
 		struct r5conf *conf, struct stripe_request_ctx *ctx,
 		sector_t logical_sector, struct bio *bi)
@@ -5997,7 +6010,8 @@ static enum stripe_result make_stripe_request(struct mddev *mddev,
 			if (ahead_of_reshape(mddev, logical_sector,
 					     conf->reshape_safe)) {
 				spin_unlock_irq(&conf->device_lock);
-				return STRIPE_SCHEDULE_AND_RETRY;
+				ret = STRIPE_SCHEDULE_AND_RETRY;
+				goto out;
 			}
 		}
 		spin_unlock_irq(&conf->device_lock);
@@ -6076,6 +6090,15 @@ static enum stripe_result make_stripe_request(struct mddev *mddev,
 
 out_release:
 	raid5_release_stripe(sh);
+out:
+	if (ret == STRIPE_SCHEDULE_AND_RETRY && !reshape_inprogress(mddev) &&
+	    reshape_disabled(mddev)) {
+		bi->bi_status = BLK_STS_IOERR;
+		ret = STRIPE_FAIL;
+		pr_err("md/raid456:%s: io failed across reshape position while reshape can't make progress.\n",
+		       mdname(mddev));
+	}
+
 	return ret;
 }
 
@@ -7708,7 +7731,8 @@ static struct r5conf *setup_conf(struct mddev *mddev)
 	}
 
 	sprintf(pers_name, "raid%d", mddev->new_level);
-	conf->thread = md_register_thread(raid5d, mddev, pers_name);
+	rcu_assign_pointer(conf->thread,
+			   md_register_thread(raid5d, mddev, pers_name));
 	if (!conf->thread) {
 		pr_warn("md/raid:%s: couldn't allocate thread.\n",
 			mdname(mddev));
@@ -7931,8 +7955,8 @@ static int raid5_run(struct mddev *mddev)
 	}
 
 	conf->min_offset_diff = min_offset_diff;
-	mddev->thread = conf->thread;
-	conf->thread = NULL;
+	rcu_assign_pointer(mddev->thread, conf->thread);
+	rcu_assign_pointer(conf->thread, NULL);
 	mddev->private = conf;
 
 	for (i = 0; i < conf->raid_disks && conf->previous_raid_disks;
@@ -8029,8 +8053,8 @@ static int raid5_run(struct mddev *mddev)
 		clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
 		set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
 		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-		mddev->sync_thread = md_register_thread(md_do_sync, mddev,
-							"reshape");
+		rcu_assign_pointer(mddev->sync_thread,
+			md_register_thread(md_do_sync, mddev, "reshape"));
 		if (!mddev->sync_thread)
 			goto abort;
 	}
@@ -8377,6 +8401,7 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
 		p = conf->disks + disk;
 		tmp = rdev_mdlock_deref(mddev, p->rdev);
 		if (test_bit(WantReplacement, &tmp->flags) &&
+		    mddev->reshape_position == MaxSector &&
 		    p->replacement == NULL) {
 			clear_bit(In_sync, &rdev->flags);
 			set_bit(Replacement, &rdev->flags);
@@ -8500,6 +8525,7 @@ static int raid5_start_reshape(struct mddev *mddev)
 	struct r5conf *conf = mddev->private;
 	struct md_rdev *rdev;
 	int spares = 0;
+	int i;
 	unsigned long flags;
 
 	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
@@ -8511,6 +8537,13 @@ static int raid5_start_reshape(struct mddev *mddev)
 	if (has_failed(conf))
 		return -EINVAL;
 
+	/* raid5 can't handle concurrent reshape and recovery */
+	if (mddev->recovery_cp < MaxSector)
+		return -EBUSY;
+	for (i = 0; i < conf->raid_disks; i++)
+		if (rdev_mdlock_deref(mddev, conf->disks[i].replacement))
+			return -EBUSY;
+
 	rdev_for_each(rdev, mddev) {
 		if (!test_bit(In_sync, &rdev->flags)
 		    && !test_bit(Faulty, &rdev->flags))
@@ -8607,8 +8640,8 @@ static int raid5_start_reshape(struct mddev *mddev)
 	clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
 	set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
 	set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-	mddev->sync_thread = md_register_thread(md_do_sync, mddev,
-						"reshape");
+	rcu_assign_pointer(mddev->sync_thread,
+			   md_register_thread(md_do_sync, mddev, "reshape"));
 	if (!mddev->sync_thread) {
 		mddev->recovery = 0;
 		spin_lock_irq(&conf->device_lock);
@@ -9043,6 +9076,22 @@ static int raid5_start(struct mddev *mddev)
 	return r5l_start(conf->log);
 }
 
+static void raid5_prepare_suspend(struct mddev *mddev)
+{
+	struct r5conf *conf = mddev->private;
+
+	wait_event(mddev->sb_wait, !reshape_inprogress(mddev) ||
+				    percpu_ref_is_zero(&mddev->active_io));
+	if (percpu_ref_is_zero(&mddev->active_io))
+		return;
+
+	/*
+	 * Reshape is not in progress, and array is suspended, io that is
+	 * waiting for reshpape can never be done.
+	 */
+	wake_up(&conf->wait_for_overlap);
+}
+
 static struct md_personality raid6_personality =
 {
 	.name		= "raid6",
@@ -9063,6 +9112,7 @@ static struct md_personality raid6_personality =
 	.check_reshape	= raid6_check_reshape,
 	.start_reshape  = raid5_start_reshape,
 	.finish_reshape = raid5_finish_reshape,
+	.prepare_suspend = raid5_prepare_suspend,
 	.quiesce	= raid5_quiesce,
 	.takeover	= raid6_takeover,
 	.change_consistency_policy = raid5_change_consistency_policy,
@@ -9087,6 +9137,7 @@ static struct md_personality raid5_personality =
 	.check_reshape	= raid5_check_reshape,
 	.start_reshape  = raid5_start_reshape,
 	.finish_reshape = raid5_finish_reshape,
+	.prepare_suspend = raid5_prepare_suspend,
 	.quiesce	= raid5_quiesce,
 	.takeover	= raid5_takeover,
 	.change_consistency_policy = raid5_change_consistency_policy,
@@ -9112,6 +9163,7 @@ static struct md_personality raid4_personality =
 	.check_reshape	= raid5_check_reshape,
 	.start_reshape  = raid5_start_reshape,
 	.finish_reshape = raid5_finish_reshape,
+	.prepare_suspend = raid5_prepare_suspend,
 	.quiesce	= raid5_quiesce,
 	.takeover	= raid4_takeover,
 	.change_consistency_policy = raid5_change_consistency_policy,