4.4-stable review patch. If anyone has any objections, please let me know.
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From: Josef Bacik jbacik@fb.com
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 jbacik@fb.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/btrfs/free-space-cache.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-)
--- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1784,6 +1784,13 @@ static int search_bitmap(struct btrfs_fr 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, @@ -1805,8 +1812,8 @@ find_free_space(struct btrfs_free_space_ 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; }
@@ -1824,8 +1831,8 @@ find_free_space(struct btrfs_free_space_ }
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; }
@@ -1837,8 +1844,10 @@ find_free_space(struct btrfs_free_space_ *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; } @@ -2696,8 +2705,8 @@ static u64 btrfs_alloc_from_bitmap(struc
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; }
@@ -2734,8 +2743,9 @@ u64 btrfs_alloc_from_cluster(struct btrf
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)) {