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Btrfs: fix raid code for removing missing drives

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When btrfs is mounted in degraded mode, it has some internal structures
to track the missing devices.  This missing device is setup as readonly,
but the mapping code can get upset when we try to write to it.

This changes the mapping code to return -EIO instead of oops when we try
to write to the readonly device.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2010-10-28 15:30:42 -04:00
parent 19fe0a8b78
commit 18e503d695
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/volumes.c
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@ -3034,8 +3034,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
}
bio->bi_sector = multi->stripes[dev_nr].physical >> 9;
dev = multi->stripes[dev_nr].dev;
BUG_ON(rw == WRITE && !dev->writeable);
if (dev && dev->bdev) {
if (dev && dev->bdev && (rw != WRITE || dev->writeable)) {
bio->bi_bdev = dev->bdev;
if (async_submit)
schedule_bio(root, dev, rw, bio);