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Btrfs: cache the extent tree preallocation

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-06-19 15:50:51 -04:00
committed by David Woodhouse
parent 63c992fd0b
commit 85e55b13e4
1 changed files with 12 additions and 2 deletions
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14
fs/btrfs/extent-tree.c
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@@ -741,7 +741,6 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
BUG_ON(ret); BUG_ON(ret);
} }
extent_root->fs_info->extent_tree_insert_nr = 0; extent_root->fs_info->extent_tree_insert_nr = 0;
extent_root->fs_info->extent_tree_prealloc_nr = 0;
return 0; return 0;
} }
@@ -951,6 +950,18 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
num_blocks = 1; num_blocks = 1;
total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3; total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3;
} }
if (fill_prealloc) {
u64 first;
int nr = info->extent_tree_prealloc_nr;
first = info->extent_tree_prealloc[nr - 1];
if (info->extent_tree_prealloc_nr >= total_needed &&
first >= search_start) {
ins->objectid = info->extent_tree_prealloc[0];
ins->offset = 1;
return 0;
}
info->extent_tree_prealloc_nr = 0;
}
if (search_end == (u64)-1) if (search_end == (u64)-1)
search_end = btrfs_super_total_blocks(info->disk_super); search_end = btrfs_super_total_blocks(info->disk_super);
if (hint_block) { if (hint_block) {
@@ -1107,7 +1118,6 @@ check_pending:
if (ins->objectid + num_blocks > first && if (ins->objectid + num_blocks > first &&
ins->objectid <= info->extent_tree_prealloc[0]) { ins->objectid <= info->extent_tree_prealloc[0]) {
search_start = info->extent_tree_prealloc[0] + 1; search_start = info->extent_tree_prealloc[0] + 1;
WARN_ON(!full_scan);
goto new_group; goto new_group;
} }
} }