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Commit 46bed2b5 authored by Jonathan Brassow's avatar Jonathan Brassow Committed by Alasdair G Kergon
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dm raid: add write_mostly parameter 



Add the write_mostly parameter to RAID1 dm-raid tables.

This allows the user to set the WriteMostly flag on a RAID1 device that
should normally be avoided for read I/O.

Signed-off-by: default avatarJonathan Brassow <jbrassow@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent c1084561

Documentation/device-mapper/dm-raid.txt

+3 −1
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ The target is named "raid" and it accepts the following parameters: 


	[min_recovery_rate <kB/sec/disk>]  Throttle RAID initialization

	[max_recovery_rate <kB/sec/disk>]  Throttle RAID initialization

	[write_mostly <idx>]		   Drive index is write-mostly

	[max_write_behind <sectors>]       See '-write-behind=' (man mdadm)

	[stripe_cache <sectors>]           Stripe cache size (higher RAIDs only)

	[region_size <sectors>]
@@ -87,9 +88,10 @@ Example tables 
        5 - 8:17 - 8:33 - 8:49 - 8:65 - 8:81



'dmsetup table' displays the table used to construct the mapping.

The optional parameters will always be printed in the order listed

The optional parameters are always printed in the order listed

above with "sync" or "nosync" always output ahead of the other

arguments, regardless of the order used when originally loading the table.

Arguments that can be repeated are ordered by value.



'dmsetup status' yields information on the state and health of the

array.

drivers/md/dm-raid.c

+25 −1
Original line number Diff line number Diff line
@@ -308,6 +308,7 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size) 
 *    [daemon_sleep <ms>]		Time between bitmap daemon work to clear bits

 *    [min_recovery_rate <kB/sec/disk>]	Throttle RAID initialization

 *    [max_recovery_rate <kB/sec/disk>]	Throttle RAID initialization

 *    [write_mostly <idx>]		Indicate a write mostly drive via index

 *    [max_write_behind <sectors>]	See '-write-behind=' (man mdadm)

 *    [stripe_cache <sectors>]		Stripe cache size for higher RAIDs

 *    [region_size <sectors>]           Defines granularity of bitmap
@@ -376,7 +377,21 @@ static int parse_raid_params(struct raid_set *rs, char **argv, 
			clear_bit(In_sync, &rs->dev[value].rdev.flags);

			rs->dev[value].rdev.recovery_offset = 0;

			rs->print_flags |= DMPF_REBUILD;

		} else if (!strcasecmp(key, "write_mostly")) {

			if (rs->raid_type->level != 1) {

				rs->ti->error = "write_mostly option is only valid for RAID1";

				return -EINVAL;

			}

			if (value > rs->md.raid_disks) {

				rs->ti->error = "Invalid write_mostly drive index given";

				return -EINVAL;

			}

			set_bit(WriteMostly, &rs->dev[value].rdev.flags);

		} else if (!strcasecmp(key, "max_write_behind")) {

			if (rs->raid_type->level != 1) {

				rs->ti->error = "max_write_behind option is only valid for RAID1";

				return -EINVAL;

			}

			rs->print_flags |= DMPF_MAX_WRITE_BEHIND;



			/*
@@ -621,11 +636,15 @@ static int raid_status(struct dm_target *ti, status_type_t type, 
		break;

	case STATUSTYPE_TABLE:

		/* The string you would use to construct this array */

		for (i = 0; i < rs->md.raid_disks; i++)

		for (i = 0; i < rs->md.raid_disks; i++) {

			if ((rs->print_flags & DMPF_REBUILD) &&

			    rs->dev[i].data_dev &&

			    !test_bit(In_sync, &rs->dev[i].rdev.flags))

				raid_param_cnt += 2; /* for rebuilds */

			if (rs->dev[i].data_dev &&

			    test_bit(WriteMostly, &rs->dev[i].rdev.flags))

				raid_param_cnt += 2;

		}



		raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2);

		if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))
@@ -656,6 +675,11 @@ static int raid_status(struct dm_target *ti, status_type_t type, 
		if (rs->print_flags & DMPF_MAX_RECOVERY_RATE)

			DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);



		for (i = 0; i < rs->md.raid_disks; i++)

			if (rs->dev[i].data_dev &&

			    test_bit(WriteMostly, &rs->dev[i].rdev.flags))

				DMEMIT(" write_mostly %u", i);



		if (rs->print_flags & DMPF_MAX_WRITE_BEHIND)

			DMEMIT(" max_write_behind %lu",

			       rs->md.bitmap_info.max_write_behind);