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authorChris Mason <clm@fb.com>2015-05-19 18:54:41 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-06-22 17:03:37 -0700
commite8b62da46bb19a5e9e72de77dc36c1d5c5c50ab1 (patch)
parent1e24644ae5af0b11a9153c0b6d981c215d7c3585 (diff)
Btrfs: fix regression in raid level conversion
commit 153c35b6cccc0c72de9fae06c8e2c8b2c47d79d4 upstream. 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 <clm@fb.com> Tested-by: Dave Sterba <dsterba@suse.cz> Reported-by: Holger Hoffstaette <holger.hoffstaette@googlemail.com> [adapted for stable kernel branch, v4.0.5] Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 18 insertions, 0 deletions
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,
+ /*
+ * 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)