ext4: lock block groups when initializing

[mirror_ubuntu-zesty-kernel.git] / fs / ext4 / mballoc.c

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8d141a25bbeece7ce4a3894374810daaa52cd4aa..4258d3289a6f82a506f31e42f15605de4336504f 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -787,13 +787,16 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                if (bh_uptodate_or_lock(bh[i]))
                        continue;
 
+               spin_lock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
                if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
                        ext4_init_block_bitmap(sb, bh[i],
                                                first_group + i, desc);
                        set_buffer_uptodate(bh[i]);
                        unlock_buffer(bh[i]);
+                       spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
                        continue;
                }
+               spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i));
                get_bh(bh[i]);
                bh[i]->b_end_io = end_buffer_read_sync;
                submit_bh(READ, bh[i]);