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Btrfs: do not mark the chunk as readonly if in degraded mode

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If a RAID setup has chunks that span multiple disks, and one of those
disks has failed, btrfs_chunk_readonly will return 1 since one of the
disks in that chunk's stripes is dead and therefore not writeable.  So
instead if we are in degraded mode, return 0 so we can go ahead and
allocate stuff.  Without this patch all of the block groups in a RAID1
setup will end up read-only, which will mean we can't add new disks to
the array since we won't be able to make allocations.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik 2010-01-27 02:07:59 +00:00 • committed by Chris Mason
commit f48b90756b
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/volumes.c
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@ -2538,6 +2538,11 @@ int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
if (!em) if (!em)
return 1; return 1;
if (btrfs_test_opt(root, DEGRADED)) {
free_extent_map(em);
return 0;
}
map = (struct map_lookup *)em->bdev; map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) { for (i = 0; i < map->num_stripes; i++) {
if (!map->stripes[i].dev->writeable) { if (!map->stripes[i].dev->writeable) {