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-rw-r--r--fs/ocfs2/suballoc.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 8a286f54dca1..64f2c50a1c37 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1380,6 +1380,14 @@ static inline int ocfs2_block_group_set_bits(handle_t *handle,
}
le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
+ if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
+ ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
+ " count %u but claims %u are freed. num_bits %d",
+ (unsigned long long)le64_to_cpu(bg->bg_blkno),
+ le16_to_cpu(bg->bg_bits),
+ le16_to_cpu(bg->bg_free_bits_count), num_bits);
+ return -EROFS;
+ }
while(num_bits--)
ocfs2_set_bit(bit_off++, bitmap);
@@ -2419,6 +2427,14 @@ static int ocfs2_block_group_clear_bits(handle_t *handle,
(unsigned long *) undo_bg->bg_bitmap);
}
le16_add_cpu(&bg->bg_free_bits_count, num_bits);
+ if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
+ ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
+ " count %u but claims %u are freed. num_bits %d",
+ (unsigned long long)le64_to_cpu(bg->bg_blkno),
+ le16_to_cpu(bg->bg_bits),
+ le16_to_cpu(bg->bg_free_bits_count), num_bits);
+ return -EROFS;
+ }
if (undo_fn)
jbd_unlock_bh_state(group_bh);