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btrfs: wait part of the write_dev_flush() can be separated out

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Submit and wait parts of write_dev_flush() can be split into two
separate functions for better readability.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-06-13 17:05:41 +08:00 committed by David Sterba
parent cea7c8bf77
commit 4fc6441aac
1 changed files with 31 additions and 28 deletions
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59
fs/btrfs/disk-io.c
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@ -3488,37 +3488,16 @@ static void btrfs_end_empty_barrier(struct bio *bio)
}
/*
* trigger flushes for one the devices. If you pass wait == 0, the flushes are
* sent down. With wait == 1, it waits for the previous flush.
*
* any device where the flush fails with eopnotsupp are flagged as not-barrier
* capable
* Submit a flush request to the device if it supports it. Error handling is
* done in the waiting counterpart.
*/
static int write_dev_flush(struct btrfs_device *device, int wait)
static void write_dev_flush(struct btrfs_device *device)
{
struct request_queue *q = bdev_get_queue(device->bdev);
struct bio *bio;
int ret = 0;
if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
return 0;
if (wait) {
bio = device->flush_bio;
wait_for_completion(&device->flush_wait);
if (bio->bi_error) {
ret = bio->bi_error;
btrfs_dev_stat_inc_and_print(device,
BTRFS_DEV_STAT_FLUSH_ERRS);
}
/* drop the reference from the wait == 0 run */
bio_put(bio);
device->flush_bio = NULL;
return ret;
}
return;
/*
* one reference for us, and we leave it for the
@ -3535,8 +3514,32 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
bio_get(bio);
btrfsic_submit_bio(bio);
}
return 0;
/*
* If the flush bio has been submitted by write_dev_flush, wait for it.
*/
static int wait_dev_flush(struct btrfs_device *device)
{
int ret = 0;
struct bio *bio = device->flush_bio;
if (!bio)
return 0;
wait_for_completion(&device->flush_wait);
if (bio->bi_error) {
ret = bio->bi_error;
btrfs_dev_stat_inc_and_print(device,
BTRFS_DEV_STAT_FLUSH_ERRS);
}
/* drop the reference from the wait == 0 run */
bio_put(bio);
device->flush_bio = NULL;
return ret;
}
static int check_barrier_error(struct btrfs_fs_devices *fsdevs)
@ -3577,7 +3580,7 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
if (!dev->in_fs_metadata || !dev->writeable)
continue;
write_dev_flush(dev, 0);
write_dev_flush(dev);
dev->last_flush_error = 0;
}
@ -3592,7 +3595,7 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
if (!dev->in_fs_metadata || !dev->writeable)
continue;
ret = write_dev_flush(dev, 1);
ret = wait_dev_flush(dev);
if (ret) {
dev->last_flush_error = ret;
errors_wait++;