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dm log: add flush_header function

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Introduce flush_header and use it to flush the log device.

Note that we don't have to flush if all the regions transition
from "dirty" to "clean" state.

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 23:52:00 +00:00 committed by Alasdair G Kergon
parent b09acf1aa7
commit 20a34a8ecc
1 changed files with 22 additions and 1 deletions
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23
drivers/md/dm-log.c
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@ -288,6 +288,19 @@ static int rw_header(struct log_c *lc, int rw)
return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
}
static int flush_header(struct log_c *lc)
{
struct dm_io_region null_location = {
.bdev = lc->header_location.bdev,
.sector = 0,
.count = 0,
};
lc->io_req.bi_rw = WRITE_BARRIER;
return dm_io(&lc->io_req, 1, &null_location, NULL);
}
static int read_header(struct log_c *log)
{
int r;
@ -616,6 +629,8 @@ static int disk_resume(struct dm_dirty_log *log)
/* write the new header */
r = rw_header(lc, WRITE);
if (!r)
r = flush_header(lc);
if (r) {
DMWARN("%s: Failed to write header on dirty region log device",
lc->log_dev->name);
@ -669,7 +684,13 @@ static int disk_flush(struct dm_dirty_log *log)
if (r)
fail_log_device(lc);
else {
lc->touched_dirtied = 0;
if (lc->touched_dirtied) {
r = flush_header(lc);
if (r)
fail_log_device(lc);
else
lc->touched_dirtied = 0;
}
lc->touched_cleaned = 0;
}