On 15.02.2018 06:30, Anand Jain wrote:
> Use ASSERT to report logical error in cow_file_range(), also move
> it a bit closer to when the num_bytes is derived.
>
> Signed-off-by: Anand Jain
> ---
> fs/btrfs/inode.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 4b156e191592..5648c4425f1e 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -976,6 +976,8 @@ static noinline int cow_file_range(struct inode *inode,
>
> num_bytes = ALIGN(end - start + 1, blocksize);
> num_bytes = max(blocksize, num_bytes);
> + ASSERT(!(num_bytes >
> + btrfs_super_total_bytes(fs_info->super_copy)));
The gist of the assert is to see if the range we want to cow is not
larger than the actual filesystem size. So just write it like:
ASSERT(numbytes <= btrfs_super_total_bytes(fs_info->super_copy))
It's a lot easier to grok.
>
> inode_should_defrag(BTRFS_I(inode), start, end, num_bytes, SZ_64K);
>
> @@ -1006,9 +1008,6 @@ static noinline int cow_file_range(struct inode *inode,
> }
> }
>
> - BUG_ON(num_bytes >
> -btrfs_super_total_bytes(fs_info->super_copy));
> -
> alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
> btrfs_drop_extent_cache(BTRFS_I(inode), start,
> start + num_bytes - 1, 0);
>
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