From 4e9fd004a7d00c04b5ee687bac053089106aa700 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 7 Nov 2008 18:17:11 -0500 Subject: [PATCH] Btrfs: Fix more false enospc errors and an oops from empty clustering In comes cases the empty cluster was added twice to the total number of bytes the allocator was trying to find. With empty clustering on, the hint byte was sometimes outside of the block group. Add an extra goto to find the correct block group. Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 0d73a53c67633..b92e92c29e3b6 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2152,11 +2152,13 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans, } search_start = max(search_start, first_logical_byte(root, 0)); search_start = max(search_start, hint_byte); - total_needed += empty_size; - if (search_start != last_wanted) + if (last_wanted && search_start != last_wanted) { last_wanted = 0; + empty_size += empty_cluster; + } + total_needed += empty_size; block_group = btrfs_lookup_block_group(root->fs_info, search_start); if (!block_group) block_group = btrfs_lookup_first_block_group(root->fs_info, @@ -2171,7 +2173,9 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans, * group thats not of the proper type, while looping this * should never happen */ - WARN_ON(!block_group); + if (!block_group) + goto new_group_no_lock; + mutex_lock(&block_group->alloc_mutex); if (unlikely(!block_group_bits(block_group, data))) goto new_group; @@ -2248,12 +2252,13 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans, break; } new_group: + mutex_unlock(&block_group->alloc_mutex); +new_group_no_lock: last_wanted = 0; - if (loop > 0) { + if (!allowed_chunk_alloc && loop > 0) { total_needed -= empty_cluster; empty_cluster = 0; } - mutex_unlock(&block_group->alloc_mutex); /* * Here's how this works. * loop == 0: we were searching a block group via a hint @@ -2271,6 +2276,10 @@ new_group: cur = head->next; loop++; } else if (loop == 1 && cur == head) { + + total_needed -= empty_cluster; + empty_cluster = 0; + if (allowed_chunk_alloc && !chunk_alloc_done) { up_read(&space_info->groups_sem); ret = do_chunk_alloc(trans, root, num_bytes + -- 2.39.5