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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-12-10 23:52:00 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-10 23:52:00 +0000 |
| commit | 20a34a8ecc7d03eaa5054f58169ebff12f5f1f8c (patch) | |
| tree | 87dd9a93e2bd11c8917d9c4bb000c3acb85723c8 /drivers/md/dm-log.c | |
| parent | b09acf1aa79462bdacfe6744b469a17722a52702 (diff) | |
| download | linux-3.10-20a34a8ecc7d03eaa5054f58169ebff12f5f1f8c.tar.gz linux-3.10-20a34a8ecc7d03eaa5054f58169ebff12f5f1f8c.tar.bz2 linux-3.10-20a34a8ecc7d03eaa5054f58169ebff12f5f1f8c.zip | |
dm log: add flush_header function
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>
Diffstat (limited to 'drivers/md/dm-log.c')
| -rw-r--r-- | drivers/md/dm-log.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c index 31dc33df95c..6b23631db5b 100644 --- a/drivers/md/dm-log.c +++ b/drivers/md/dm-log.c @@ -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; } |