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dm raid1: implement mirror_flush

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

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-12-10 23:52:02 +00:00 committed by Alasdair G Kergon
parent 076010e2e6
commit c0da3748b9
1 changed files with 36 additions and 1 deletions
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37
drivers/md/dm-raid1.c
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@ -237,6 +237,40 @@ out:
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;