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Btrfs: enforce metadata allocation clustering

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The allocator uses the last allocation as a starting point for metadata
allocations, and tries to allocate in clusters of at least 256k.

If the search for a free block fails to find the expected block, this patch
forces a new cluster to be found in the free list.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-11-06 21:48:27 -05:00
parent 771ed689d2
commit 3b7885bf96
2 changed files with 17 additions and 7 deletions
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17
fs/btrfs/extent-tree.c
View file

@ -2195,6 +2195,23 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
if (search_start + num_bytes > end)
goto new_group;
if (last_ptr && *last_ptr && search_start != *last_ptr) {
total_needed += empty_cluster;
*last_ptr = 0;
/*
* if search_start is still in this block group
* then we just re-search this block group
*/
if (search_start >= start &&
search_start < end) {
mutex_unlock(&block_group->alloc_mutex);
continue;
}
/* else we go to the next block group */
goto new_group;
}
if (exclude_nr > 0 &&
(search_start + num_bytes > exclude_start &&
search_start < exclude_start + exclude_nr)) {

7
fs/btrfs/extent_io.c
View file

@ -2494,13 +2494,6 @@ retry:
index = 0;
goto retry;
}
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
mapping->writeback_index = index;
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1;
if (wbc->range_cont)
wbc->range_start = index << PAGE_CACHE_SHIFT;
return ret;
}
EXPORT_SYMBOL(extent_write_cache_pages);