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Btrfs: Optimize tree log block allocations

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Since tree log blocks get freed every transaction, they never really
need to be written to disk.  This skips the step where we update
metadata to record they were allocated.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-09-11 15:54:42 -04:00
parent 3a5f1d458a
commit d00aff0013
3 changed files with 23 additions and 21 deletions
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19
fs/btrfs/extent-tree.c
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@@ -1872,8 +1872,15 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
return 0;
}
/* if metadata always pin */
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID)
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
/* btrfs_free_reserved_extent */
set_extent_dirty(&root->fs_info->free_space_cache,
bytenr, bytenr + num_bytes - 1, GFP_NOFS);
return 0;
}
pin = 1;
}
/* if data pin when any transaction has committed this */
if (ref_generation != trans->transid)
@@ -2361,11 +2368,13 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
min_alloc_size, empty_size, hint_byte,
search_end, ins, data);
BUG_ON(ret);
ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid,
ref_generation, owner,
owner_offset, ins);
BUG_ON(ret);
if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid,
ref_generation, owner,
owner_offset, ins);
BUG_ON(ret);
}
maybe_unlock_mutex(root);
return ret;
}