Btrfs: fix a bug of writting free space cache during balance
Here is the whole story: 1) A free space cache consists of two parts: o free space cache inode, which is special becase it's stored in root tree. o free space info, which is stored as the above inode's file data. But we only build up another new inode and does not flush its free space info onto disk when we _clear and setup_ free space cache, and this ends up with that the block group cache's cache_state remains DC_SETUP instead of DC_WRITTEN. And holding DC_SETUP means that we will not truncate this free space cache inode, which means the disk offset of its file extent will remain _unchanged_ at least until next transaction finishes committing itself. 2) We can set a block group readonly when we relocate the block group. However, if the readonly block group covers the disk offset where our free space cache inode is going to write, it will force the free space cache inode into cow_file_range() and it'll end up hitting a BUG_ON. 3) Due to the above analysis, we fix this bug by adding the missing dirty flag. 4) However, it's not over, there is still another case, nospace_cache. With nospace_cache, we do not want to set dirty flag, instead we just truncate free space cache inode and bail out with setting cache state DC_WRITTEN. We can benifit from it since it saves us another 'pre-allocation' part which usually costs a lot. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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1 changed files with 21 additions and 3 deletions
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@ -2903,8 +2903,13 @@ static int cache_save_setup(struct btrfs_block_group_cache *block_group,
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}
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spin_lock(&block_group->lock);
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if (block_group->cached != BTRFS_CACHE_FINISHED) {
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/* We're not cached, don't bother trying to write stuff out */
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if (block_group->cached != BTRFS_CACHE_FINISHED ||
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!btrfs_test_opt(root, SPACE_CACHE)) {
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/*
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* don't bother trying to write stuff out _if_
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* a) we're not cached,
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* b) we're with nospace_cache mount option.
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*/
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dcs = BTRFS_DC_WRITTEN;
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spin_unlock(&block_group->lock);
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goto out_put;
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@ -7614,8 +7619,21 @@ int btrfs_read_block_groups(struct btrfs_root *root)
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INIT_LIST_HEAD(&cache->list);
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INIT_LIST_HEAD(&cache->cluster_list);
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if (need_clear)
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if (need_clear) {
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/*
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* When we mount with old space cache, we need to
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* set BTRFS_DC_CLEAR and set dirty flag.
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*
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* a) Setting 'BTRFS_DC_CLEAR' makes sure that we
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* truncate the old free space cache inode and
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* setup a new one.
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* b) Setting 'dirty flag' makes sure that we flush
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* the new space cache info onto disk.
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*/
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cache->disk_cache_state = BTRFS_DC_CLEAR;
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if (btrfs_test_opt(root, SPACE_CACHE))
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cache->dirty = 1;
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}
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read_extent_buffer(leaf, &cache->item,
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btrfs_item_ptr_offset(leaf, path->slots[0]),
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