From: Chris Mason <c...@fb.com>
Commit 2f0810880f082fa8ba66ab2c33b02e4ff9770a5e changed
btrfs_set_block_group_ro to avoid trying to allocate new chunks with the
new raid profile during conversion. This fixed failures when there was
no space on the drive to allocate a new chunk, but the metadata
reserves were sufficient to continue the conversion.
But this ended up causing a regression when the drive had plenty of
space to allocate new chunks, mostly because reduce_alloc_profile isn't
using the new raid profile.
Fixing btrfs_reduce_alloc_profile is a bigger patch. For now, do a
partial revert of 2f0810880, and don't error out if we hit ENOSPC.
Signed-off-by: Chris Mason <c...@fb.com>
Tested-by: Dave Sterba <dste...@suse.cz>
Reported-by: Holger Hoffstaette <holger.hoffstae...@googlemail.com>
[adapted for stable kernel branch, v4.0.5]
Signed-off-by: David Sterba <dste...@suse.cz>
---
fs/btrfs/extent-tree.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 8b33da6ec3dd..63be2a96ed6a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8535,6 +8535,24 @@ int btrfs_set_block_group_ro(struct btrfs_root *root,
trans = btrfs_join_transaction(root);
if (IS_ERR(trans))
return PTR_ERR(trans);
+ /*
+ * if we are changing raid levels, try to allocate a corresponding
+ * block group with the new raid level.
+ */
+ alloc_flags = update_block_group_flags(root, cache->flags);
+ if (alloc_flags != cache->flags) {
+ ret = do_chunk_alloc(trans, root, alloc_flags,
+ CHUNK_ALLOC_FORCE);
+ /*
+ * ENOSPC is allowed here, we may have enough space
+ * already allocated at the new raid level to
+ * carry on
+ */
+ if (ret == -ENOSPC)
+ ret = 0;
+ if (ret < 0)
+ goto out;
+ }
ret = set_block_group_ro(cache, 0);
if (!ret)
--
2.1.3
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