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authorChris Mason <chris.mason@oracle.com>2011-02-16 13:57:04 -0500
committerChris Mason <chris.mason@oracle.com>2011-02-16 15:28:47 -0500
commitc87f08ca44e83b2c8d28f63f9c33f3a270a04bbe (patch)
tree05cebe37380861a89faaea50c1ccb360ffb0f975 /fs/btrfs/extent-tree.c
parent91435650c233b93e0da389db74f4b2c11c5ad2d4 (diff)
downloadop-kernel-dev-c87f08ca44e83b2c8d28f63f9c33f3a270a04bbe.zip
op-kernel-dev-c87f08ca44e83b2c8d28f63f9c33f3a270a04bbe.tar.gz
Btrfs: allow balance to explicitly allocate chunks as it relocates
Btrfs device shrinking and balancing ends up reallocating all the blocks in order to allow COW to move them to new destinations. It is somewhat awkward in terms of ENOSPC because most of the enospc code is built around the idea that some operation on a reference counted tree triggers allocations in the non-reference counted trees. This commit changes the balancing code to deal with enospc by trying to allocate a new chunk. If that allocation succeeds, we go ahead and retry whatever failed due to enospc. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d375fc0..100e409 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8066,6 +8066,13 @@ out:
return ret;
}
+int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 type)
+{
+ u64 alloc_flags = get_alloc_profile(root, type);
+ return do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1);
+}
+
/*
* helper to account the unused space of all the readonly block group in the
* list. takes mirrors into account.
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