Merge tag 'for-4.12/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - A major update for DM cache that reduces the latency for deciding
   whether blocks should migrate to/from the cache. The bio-prison-v2
   interface supports this improvement by enabling direct dispatch of
   work to workqueues rather than having to delay the actual work
   dispatch to the DM cache core. So the dm-cache policies are much more
   nimble by being able to drive IO as they see fit. One immediate
   benefit from the improved latency is a cache that should be much more
   adaptive to changing workloads.

 - Add a new DM integrity target that emulates a block device that has
   additional per-sector tags that can be used for storing integrity
   information.

 - Add a new authenticated encryption feature to the DM crypt target
   that builds on the capabilities provided by the DM integrity target.

 - Add MD interface for switching the raid4/5/6 journal mode and update
   the DM raid target to use it to enable aid4/5/6 journal write-back
   support.

 - Switch the DM verity target over to using the asynchronous hash
   crypto API (this helps work better with architectures that have
   access to off-CPU algorithm providers, which should reduce CPU
   utilization).

 - Various request-based DM and DM multipath fixes and improvements from
   Bart and Christoph.

 - A DM thinp target fix for a bio structure leak that occurs for each
   discard IFF discard passdown is enabled.

 - A fix for a possible deadlock in DM bufio and a fix to re-check the
   new buffer allocation watermark in the face of competing admin
   changes to the 'max_cache_size_bytes' tunable.

 - A couple DM core cleanups.

* tag 'for-4.12/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (50 commits)
  dm bufio: check new buffer allocation watermark every 30 seconds
  dm bufio: avoid a possible ABBA deadlock
  dm mpath: make it easier to detect unintended I/O request flushes
  dm mpath: cleanup QUEUE_IF_NO_PATH bit manipulation by introducing assign_bit()
  dm mpath: micro-optimize the hot path relative to MPATHF_QUEUE_IF_NO_PATH
  dm: introduce enum dm_queue_mode to cleanup related code
  dm mpath: verify __pg_init_all_paths locking assumptions at runtime
  dm: verify suspend_locking assumptions at runtime
  dm block manager: remove an unused argument from dm_block_manager_create()
  dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue()
  dm mpath: delay requeuing while path initialization is in progress
  dm mpath: avoid that path removal can trigger an infinite loop
  dm mpath: split and rename activate_path() to prepare for its expanded use
  dm ioctl: prevent stack leak in dm ioctl call
  dm integrity: use previously calculated log2 of sectors_per_block
  dm integrity: use hex2bin instead of open-coded variant
  dm crypt: replace custom implementation of hex2bin()
  dm crypt: remove obsolete references to per-CPU state
  dm verity: switch to using asynchronous hash crypto API
  dm crypt: use WQ_HIGHPRI for the IO and crypt workqueues
  ...

1 files changed, 122 insertions, 42 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 2dae3e5b851c..7d893228c40f 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2010-2011 Neil Brown
- * Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2010-2017 Red Hat, Inc. All rights reserved.
  *
  * This file is released under the GPL.
  */
@@ -79,7 +79,10 @@ struct raid_dev {
 #define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
 
 /* New for v1.10.0 */
-#define __CTR_FLAG_JOURNAL_DEV		15 /* 2 */ /* Only with raid4/5/6! */
+#define __CTR_FLAG_JOURNAL_DEV		15 /* 2 */ /* Only with raid4/5/6 (journal device)! */
+
+/* New for v1.11.1 */
+#define __CTR_FLAG_JOURNAL_MODE		16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */
 
 /*
  * Flags for rs->ctr_flags field.
@@ -100,6 +103,7 @@ struct raid_dev {
 #define CTR_FLAG_DATA_OFFSET		(1 << __CTR_FLAG_DATA_OFFSET)
 #define CTR_FLAG_RAID10_USE_NEAR_SETS	(1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
 #define CTR_FLAG_JOURNAL_DEV		(1 << __CTR_FLAG_JOURNAL_DEV)
+#define CTR_FLAG_JOURNAL_MODE		(1 << __CTR_FLAG_JOURNAL_MODE)
 
 #define RESUME_STAY_FROZEN_FLAGS (CTR_FLAG_DELTA_DISKS | CTR_FLAG_DATA_OFFSET)
 
@@ -175,7 +179,8 @@ struct raid_dev {
 				 CTR_FLAG_REGION_SIZE | \
 				 CTR_FLAG_DELTA_DISKS | \
 				 CTR_FLAG_DATA_OFFSET | \
-				 CTR_FLAG_JOURNAL_DEV)
+				 CTR_FLAG_JOURNAL_DEV | \
+				 CTR_FLAG_JOURNAL_MODE)
 
 #define RAID6_VALID_FLAGS	(CTR_FLAG_SYNC | \
 				 CTR_FLAG_REBUILD | \
@@ -186,7 +191,8 @@ struct raid_dev {
 				 CTR_FLAG_REGION_SIZE | \
 				 CTR_FLAG_DELTA_DISKS | \
 				 CTR_FLAG_DATA_OFFSET | \
-				 CTR_FLAG_JOURNAL_DEV)
+				 CTR_FLAG_JOURNAL_DEV | \
+				 CTR_FLAG_JOURNAL_MODE)
 /* ...valid options definitions per raid level */
 
 /*
@@ -239,6 +245,7 @@ struct raid_set {
 	struct journal_dev {
 		struct dm_dev *dev;
 		struct md_rdev rdev;
+		int mode;
 	} journal_dev;
 
 	struct raid_dev dev[0];
@@ -326,6 +333,7 @@ static struct arg_name_flag {
 	{ CTR_FLAG_DELTA_DISKS, "delta_disks"},
 	{ CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
 	{ CTR_FLAG_JOURNAL_DEV, "journal_dev" },
+	{ CTR_FLAG_JOURNAL_MODE, "journal_mode" },
 };
 
 /* Return argument name string for given @flag */
@@ -344,6 +352,39 @@ static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
 	return NULL;
 }
 
+/* Define correlation of raid456 journal cache modes and dm-raid target line parameters */
+static struct {
+	const int mode;
+	const char *param;
+} _raid456_journal_mode[] = {
+	{ R5C_JOURNAL_MODE_WRITE_THROUGH , "writethrough" },
+	{ R5C_JOURNAL_MODE_WRITE_BACK    , "writeback" }
+};
+
+/* Return MD raid4/5/6 journal mode for dm @journal_mode one */
+static int dm_raid_journal_mode_to_md(const char *mode)
+{
+	int m = ARRAY_SIZE(_raid456_journal_mode);
+
+	while (m--)
+		if (!strcasecmp(mode, _raid456_journal_mode[m].param))
+			return _raid456_journal_mode[m].mode;
+
+	return -EINVAL;
+}
+
+/* Return dm-raid raid4/5/6 journal mode string for @mode */
+static const char *md_journal_mode_to_dm_raid(const int mode)
+{
+	int m = ARRAY_SIZE(_raid456_journal_mode);
+
+	while (m--)
+		if (mode == _raid456_journal_mode[m].mode)
+			return _raid456_journal_mode[m].param;
+
+	return "unknown";
+}
+
 /*
  * Bool helpers to test for various raid levels of a raid set.
  * It's level as reported by the superblock rather than
@@ -1183,7 +1224,7 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
 			continue;
 		}
 
-		/* "journal_dev dev" */
+		/* "journal_dev <dev>" */
 		if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) {
 			int r;
 			struct md_rdev *jdev;
@@ -1211,10 +1252,32 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
 				rs->ti->error = "No space for raid4/5/6 journal";
 				return -ENOSPC;
 			}
+			rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
 			set_bit(Journal, &jdev->flags);
 			continue;
 		}
 
+		/* "journal_mode <mode>" ("journal_dev" mandatory!) */
+		if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) {
+			int r;
+
+			if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
+				rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'";
+				return -EINVAL;
+			}
+			if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
+				rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed";
+				return -EINVAL;
+			}
+			r = dm_raid_journal_mode_to_md(arg);
+			if (r < 0) {
+				rs->ti->error = "Invalid 'journal_mode' argument";
+				return r;
+			}
+			rs->journal_dev.mode = r;
+			continue;
+		}
+
 		/*
 		 * Parameters with number values from here on.
 		 */
@@ -3076,6 +3139,16 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	rs->callbacks.congested_fn = raid_is_congested;
 	dm_table_add_target_callbacks(ti->table, &rs->callbacks);
 
+	/* If raid4/5/6 journal mode explictely requested (only possible with journal dev) -> set it */
+	if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
+		r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
+		if (r) {
+			ti->error = "Failed to set raid4/5/6 journal mode";
+			mddev_unlock(&rs->md);
+			goto bad_journal_mode_set;
+		}
+	}
+
 	mddev_suspend(&rs->md);
 
 	/* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
@@ -3109,6 +3182,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	mddev_unlock(&rs->md);
 	return 0;
 
+bad_journal_mode_set:
 bad_stripe_cache:
 bad_check_reshape:
 	md_stop(&rs->md);
@@ -3180,18 +3254,18 @@ static const char *decipher_sync_action(struct mddev *mddev)
  * Status characters:
  *
  *  'D' = Dead/Failed raid set component or raid4/5/6 journal device
- *  'a' = Alive but not in-sync
- *  'A' = Alive and in-sync raid set component or alive raid4/5/6 journal device
+ *  'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device
+ *  'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
  *  '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
  */
-static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync)
+static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev, bool array_in_sync)
 {
 	if (!rdev->bdev)
 		return "-";
 	else if (test_bit(Faulty, &rdev->flags))
 		return "D";
 	else if (test_bit(Journal, &rdev->flags))
-		return "A";
+		return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
 	else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
 		return "a";
 	else
@@ -3315,7 +3389,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
 
 		/* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
 		for (i = 0; i < rs->raid_disks; i++)
-			DMEMIT(__raid_dev_status(&rs->dev[i].rdev, array_in_sync));
+			DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev, array_in_sync));
 
 		/*
 		 * In-sync/Reshape ratio:
@@ -3366,7 +3440,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
 		 * v1.10.0+:
 		 */
 		DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
-			      __raid_dev_status(&rs->journal_dev.rdev, 0) : "-");
+			      __raid_dev_status(rs, &rs->journal_dev.rdev, 0) : "-");
 		break;
 
 	case STATUSTYPE_TABLE:
@@ -3381,39 +3455,30 @@ static void raid_status(struct dm_target *ti, status_type_t type,
 				  write_mostly_params +
 				  hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
 				  hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2 +
-				  (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? 2 : 0);
+				  (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? 2 : 0) +
+				  (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags) ? 2 : 0);
+
 		/* Emit table line */
+		/* This has to be in the documented order for userspace! */
 		DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
-		if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
-			DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
-					 raid10_md_layout_to_format(mddev->layout));
-		if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
-			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
-					 raid10_md_layout_to_copies(mddev->layout));
-		if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
-			DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
 		if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
 			DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
-		if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
-			DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
-					   (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
-		if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
-			DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
-					   (unsigned long long) rs->data_offset);
-		if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
-			DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
-					  mddev->bitmap_info.daemon_sleep);
-		if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
-			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
-					 max(rs->delta_disks, mddev->delta_disks));
-		if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
-			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
-					 max_nr_stripes);
+		if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
+			DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
 		if (rebuild_disks)
 			for (i = 0; i < rs->raid_disks; i++)
 				if (test_bit(rs->dev[i].rdev.raid_disk, (void *) rs->rebuild_disks))
 					DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
 							 rs->dev[i].rdev.raid_disk);
+		if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
+			DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
+					  mddev->bitmap_info.daemon_sleep);
+		if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
+			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
+					 mddev->sync_speed_min);
+		if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
+			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
+					 mddev->sync_speed_max);
 		if (write_mostly_params)
 			for (i = 0; i < rs->raid_disks; i++)
 				if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
@@ -3422,15 +3487,30 @@ static void raid_status(struct dm_target *ti, status_type_t type,
 		if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
 			DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
 					  mddev->bitmap_info.max_write_behind);
-		if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
-			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
-					 mddev->sync_speed_max);
-		if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
-			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
-					 mddev->sync_speed_min);
+		if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
+			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
+					 max_nr_stripes);
+		if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
+			DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
+					   (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
+		if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
+			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
+					 raid10_md_layout_to_copies(mddev->layout));
+		if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
+			DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
+					 raid10_md_layout_to_format(mddev->layout));
+		if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
+			DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
+					 max(rs->delta_disks, mddev->delta_disks));
+		if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
+			DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
+					   (unsigned long long) rs->data_offset);
 		if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags))
 			DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV),
 					__get_dev_name(rs->journal_dev.dev));
+		if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags))
+			DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE),
+					 md_journal_mode_to_dm_raid(rs->journal_dev.mode));
 		DMEMIT(" %d", rs->raid_disks);
 		for (i = 0; i < rs->raid_disks; i++)
 			DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
@@ -3791,7 +3871,7 @@ static void raid_resume(struct dm_target *ti)
 
 static struct target_type raid_target = {
 	.name = "raid",
-	.version = {1, 10, 1},
+	.version = {1, 11, 1},
 	.module = THIS_MODULE,
 	.ctr = raid_ctr,
 	.dtr = raid_dtr,