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btrfs: don't use ctl->free_space for max_extent_size 

max_extent_size is supposed to be the largest contiguous range for the
space info, and ctl->free_space is the total free space in the block
group.  We need to keep track of these separately and _only_ use the
max_free_space if we don't have a max_extent_size, as that means our
original request was too large to search any of the block groups for and
therefore wouldn't have a max_extent_size set.

CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2018-10-11 15:54:09 -04:00 committed by David Sterba
parent ad22cf6ea4
commit fb5c39d7a8
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/extent-tree.c
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@ -7257,6 +7257,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group = NULL;
u64 search_start = 0;
u64 max_extent_size = 0;
u64 max_free_space = 0;
u64 empty_cluster = 0;
struct btrfs_space_info *space_info;
int loop = 0;
@ -7552,8 +7553,8 @@ unclustered_alloc:
spin_lock(&ctl->tree_lock);
if (ctl->free_space <
num_bytes + empty_cluster + empty_size) {
if (ctl->free_space > max_extent_size)
max_extent_size = ctl->free_space;
max_free_space = max(max_free_space,
ctl->free_space);
spin_unlock(&ctl->tree_lock);
goto loop;
}
@ -7720,6 +7721,8 @@ loop:
}
out:
if (ret == -ENOSPC) {
if (!max_extent_size)
max_extent_size = max_free_space;
spin_lock(&space_info->lock);
space_info->max_extent_size = max_extent_size;
spin_unlock(&space_info->lock);