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Commit c0da3748 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
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dm raid1: implement mirror_flush 



Implement flush callee. It uses dm_io to send zero-size barrier synchronously
and concurrently to all the mirror legs.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 076010e2

drivers/md/dm-raid1.c

+36 −1
Original line number Diff line number Diff line
@@ -237,6 +237,40 @@ static void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) 
	schedule_work(&ms->trigger_event);

}



static int mirror_flush(struct dm_target *ti)

{

	struct mirror_set *ms = ti->private;

	unsigned long error_bits;



	unsigned int i;

	struct dm_io_region io[ms->nr_mirrors];

	struct mirror *m;

	struct dm_io_request io_req = {

		.bi_rw = WRITE_BARRIER,

		.mem.type = DM_IO_KMEM,

		.mem.ptr.bvec = NULL,

		.client = ms->io_client,

	};



	for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) {

		io[i].bdev = m->dev->bdev;

		io[i].sector = 0;

		io[i].count = 0;

	}



	error_bits = -1;

	dm_io(&io_req, ms->nr_mirrors, io, &error_bits);

	if (unlikely(error_bits != 0)) {

		for (i = 0; i < ms->nr_mirrors; i++)

			if (test_bit(i, &error_bits))

				fail_mirror(ms->mirror + i,

					    DM_RAID1_WRITE_ERROR);

		return -EIO;

	}



	return 0;

}



/*-----------------------------------------------------------------

 * Recovery.

 *
@@ -896,7 +930,8 @@ static struct dm_dirty_log *create_dirty_log(struct dm_target *ti, 
		return NULL;

	}



	dl = dm_dirty_log_create(argv[0], ti, NULL, param_count, argv + 2);

	dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count,

				 argv + 2);

	if (!dl) {

		ti->error = "Error creating mirror dirty log";

		return NULL;