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Btrfs: don't count I/O statistic read errors for missing devices 

It is normal behaviour of the low level btrfs function btrfs_map_bio()
to complete a bio with -EIO if the device is missing, instead of just
preventing the bio creation in an earlier step.
This used to cause I/O statistic read error increments and annoying
printk_ratelimited messages. This commit fixes the issue.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Reported-by: Carey Underwood <cwillu@cwillu.com>
This commit is contained in:
Stefan Behrens 2012-06-14 16:42:31 +02:00 committed by Chris Mason
parent d42244a0d3
commit 597a60fade
1 changed files with 12 additions and 10 deletions
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22
fs/btrfs/volumes.c
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@ -4061,16 +4061,18 @@ static void btrfs_end_bio(struct bio *bio, int err)
BUG_ON(stripe_index >= bbio->num_stripes);
dev = bbio->stripes[stripe_index].dev;
if (bio->bi_rw & WRITE)
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_WRITE_ERRS);
else
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_READ_ERRS);
if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH)
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_FLUSH_ERRS);
btrfs_dev_stat_print_on_error(dev);
if (dev->bdev) {
if (bio->bi_rw & WRITE)
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_WRITE_ERRS);
else
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_READ_ERRS);
if ((bio->bi_rw & WRITE_FLUSH) == WRITE_FLUSH)
btrfs_dev_stat_inc(dev,
BTRFS_DEV_STAT_FLUSH_ERRS);
btrfs_dev_stat_print_on_error(dev);
}
}
}