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btrfs: write_dev_flush does not return ENOMEM anymore 

Since commit "btrfs: btrfs_io_bio_alloc never fails, skip error handling"
write_dev_flush will not return ENOMEM in the sending part. We do not
need to check for it in the callers.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ updated changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-06-13 17:32:29 +08:00 committed by David Sterba
parent 170607ebd9
commit 12b9bf0b94
1 changed files with 5 additions and 33 deletions
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38
fs/btrfs/disk-io.c
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@ -3505,13 +3505,6 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
if (wait) {
bio = device->flush_bio;
if (!bio)
/*
* This means the alloc has failed with ENOMEM, however
* here we return 0, as its not a device error.
*/
return 0;
wait_for_completion(&device->flush_wait);
if (bio->bi_error) {
@ -3548,25 +3541,16 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
static int check_barrier_error(struct btrfs_fs_devices *fsdevs)
{
int submit_flush_error = 0;
int dev_flush_error = 0;
struct btrfs_device *dev;
int tolerance;
list_for_each_entry_rcu(dev, &fsdevs->devices, dev_list) {
if (!dev->bdev) {
submit_flush_error++;
dev_flush_error++;
continue;
}
if (dev->last_flush_error == -ENOMEM)
submit_flush_error++;
if (dev->last_flush_error && dev->last_flush_error != -ENOMEM)
if (!dev->bdev || dev->last_flush_error)
dev_flush_error++;
}
tolerance = fsdevs->fs_info->num_tolerated_disk_barrier_failures;
if (submit_flush_error > tolerance || dev_flush_error > tolerance)
if (dev_flush_error >
fsdevs->fs_info->num_tolerated_disk_barrier_failures)
return -EIO;
return 0;
@ -3596,10 +3580,8 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
if (!dev->in_fs_metadata || !dev->writeable)
continue;
ret = write_dev_flush(dev, 0);
if (ret)
errors_send++;
dev->last_flush_error = ret;
write_dev_flush(dev, 0);
dev->last_flush_error = 0;
}
/* wait for all the barriers */
@ -3620,16 +3602,6 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
}
}
/*
* Try hard in case of flush. Lets say, in RAID1 we have
* the following situation
* dev1: EIO dev2: ENOMEM
* this is not a fatal error as we hope to recover from
* ENOMEM in the next attempt to flush.
* But the following is considered as fatal
* dev1: ENOMEM dev2: ENOMEM
* dev1: bdev == NULL dev2: ENOMEM
*/
if (errors_send || errors_wait) {
/*
* At some point we need the status of all disks