From 4a351e751731e1358c7ec71b18478bbd9ebdde08 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 12 Oct 2018 15:32:33 -0400 Subject: [PATCH] btrfs: set max_extent_size properly commit ad22cf6ea47fa20fbe11ac324a0a15c0a9a4a2a9 upstream. We can't use entry->bytes if our entry is a bitmap entry, we need to use entry->max_extent_size in that case. Fix up all the logic to make this consistent. CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/free-space-cache.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 82450978d00d..44097546c7ca 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1772,6 +1772,13 @@ static int search_bitmap(struct btrfs_free_space_ctl *ctl, return -1; } +static inline u64 get_max_extent_size(struct btrfs_free_space *entry) +{ + if (entry->bitmap) + return entry->max_extent_size; + return entry->bytes; +} + /* Cache the size of the max extent in bytes */ static struct btrfs_free_space * find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, @@ -1793,8 +1800,8 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, for (node = &entry->offset_index; node; node = rb_next(node)) { entry = rb_entry(node, struct btrfs_free_space, offset_index); if (entry->bytes < *bytes) { - if (entry->bytes > *max_extent_size) - *max_extent_size = entry->bytes; + *max_extent_size = max(get_max_extent_size(entry), + *max_extent_size); continue; } @@ -1812,8 +1819,8 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, } if (entry->bytes < *bytes + align_off) { - if (entry->bytes > *max_extent_size) - *max_extent_size = entry->bytes; + *max_extent_size = max(get_max_extent_size(entry), + *max_extent_size); continue; } @@ -1825,8 +1832,10 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, *offset = tmp; *bytes = size; return entry; - } else if (size > *max_extent_size) { - *max_extent_size = size; + } else { + *max_extent_size = + max(get_max_extent_size(entry), + *max_extent_size); } continue; } @@ -2686,8 +2695,8 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, err = search_bitmap(ctl, entry, &search_start, &search_bytes, true); if (err) { - if (search_bytes > *max_extent_size) - *max_extent_size = search_bytes; + *max_extent_size = max(get_max_extent_size(entry), + *max_extent_size); return 0; } @@ -2724,8 +2733,9 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, entry = rb_entry(node, struct btrfs_free_space, offset_index); while (1) { - if (entry->bytes < bytes && entry->bytes > *max_extent_size) - *max_extent_size = entry->bytes; + if (entry->bytes < bytes) + *max_extent_size = max(get_max_extent_size(entry), + *max_extent_size); if (entry->bytes < bytes || (!entry->bitmap && entry->offset < min_start)) { -- 2.11.0