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Btrfs: Allocator fix variety pack

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* Force chunk allocation when find_free_extent has to do a full scan
* Record the max key at the start of defrag so it doesn't run forever
* Block groups might not be contiguous, make a forward search for the
  next block group in extent-tree.c
* Get rid of extra checks for total fs size
* Fix relocate_one_reference to avoid relocating the same file data block
  twice when referenced by an older transaction
* Use the open device count when allocating chunks so that we don't
  try to allocate from devices that don't exist

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-05-24 14:04:53 -04:00
parent 515dc3228c
commit 0ef3e66b67
5 changed files with 213 additions and 101 deletions
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17
fs/btrfs/tree-defrag.c
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@@ -198,6 +198,13 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
goto out;
}
if (root->defrag_progress.objectid == 0) {
u32 nritems;
nritems = btrfs_header_nritems(root->node);
root->defrag_max.objectid = 0;
/* from above we know this is not a leaf */
btrfs_node_key_to_cpu(root->node, &root->defrag_max,
nritems - 1);
extent_buffer_get(root->node);
ret = btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
BUG_ON(ret);
@@ -254,6 +261,16 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
out:
if (path)
btrfs_free_path(path);
if (ret == -EAGAIN) {
if (root->defrag_max.objectid > root->defrag_progress.objectid)
goto done;
if (root->defrag_max.type > root->defrag_progress.type)
goto done;
if (root->defrag_max.offset > root->defrag_progress.offset)
goto done;
ret = 0;
}
done:
if (ret != -EAGAIN) {
memset(&root->defrag_progress, 0,
sizeof(root->defrag_progress));