Re: [PATCH v2 2/4] fsx: factor out a file size update helper

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Aug 28, 2024 at 02:15:32PM -0400, Brian Foster wrote:
> In preparation for support for eof page pollution, factor out a file
> size update helper. This updates the internally tracked file size
> based on the upcoming operation and zeroes the appropriate range in
> the good buffer for extending operations.
> 
> Signed-off-by: Brian Foster <bfoster@redhat.com>

Looks like a straightforward hoist now.
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  ltp/fsx.c | 49 +++++++++++++++++++++----------------------------
>  1 file changed, 21 insertions(+), 28 deletions(-)
> 
> diff --git a/ltp/fsx.c b/ltp/fsx.c
> index c5727cff..4a9be0e1 100644
> --- a/ltp/fsx.c
> +++ b/ltp/fsx.c
> @@ -983,6 +983,17 @@ gendata(char *original_buf, char *good_buf, unsigned offset, unsigned size)
>  	}
>  }
>  
> +/*
> + * Helper to update the tracked file size. If the offset begins beyond current
> + * EOF, zero the range from EOF to offset in the good buffer.
> + */
> +void
> +update_file_size(unsigned offset, unsigned size)
> +{
> +	if (offset > file_size)
> +		memset(good_buf + file_size, '\0', offset - file_size);
> +	file_size = offset + size;
> +}
>  
>  void
>  dowrite(unsigned offset, unsigned size)
> @@ -1003,10 +1014,8 @@ dowrite(unsigned offset, unsigned size)
>  	log4(OP_WRITE, offset, size, FL_NONE);
>  
>  	gendata(original_buf, good_buf, offset, size);
> -	if (file_size < offset + size) {
> -		if (file_size < offset)
> -			memset(good_buf + file_size, '\0', offset - file_size);
> -		file_size = offset + size;
> +	if (offset + size > file_size) {
> +		update_file_size(offset, size);
>  		if (lite) {
>  			warn("Lite file size bug in fsx!");
>  			report_failure(149);
> @@ -1070,10 +1079,8 @@ domapwrite(unsigned offset, unsigned size)
>  	log4(OP_MAPWRITE, offset, size, FL_NONE);
>  
>  	gendata(original_buf, good_buf, offset, size);
> -	if (file_size < offset + size) {
> -		if (file_size < offset)
> -			memset(good_buf + file_size, '\0', offset - file_size);
> -		file_size = offset + size;
> +	if (offset + size > file_size) {
> +		update_file_size(offset, size);
>  		if (lite) {
>  			warn("Lite file size bug in fsx!");
>  			report_failure(200);
> @@ -1136,9 +1143,7 @@ dotruncate(unsigned size)
>  
>  	log4(OP_TRUNCATE, 0, size, FL_NONE);
>  
> -	if (size > file_size)
> -		memset(good_buf + file_size, '\0', size - file_size);
> -	file_size = size;
> +	update_file_size(size, 0);
>  
>  	if (testcalls <= simulatedopcount)
>  		return;
> @@ -1247,16 +1252,8 @@ do_zero_range(unsigned offset, unsigned length, int keep_size)
>  	log4(OP_ZERO_RANGE, offset, length,
>  	     keep_size ? FL_KEEP_SIZE : FL_NONE);
>  
> -	if (!keep_size && end_offset > file_size) {
> -		/*
> -		 * If there's a gap between the old file size and the offset of
> -		 * the zero range operation, fill the gap with zeroes.
> -		 */
> -		if (offset > file_size)
> -			memset(good_buf + file_size, '\0', offset - file_size);
> -
> -		file_size = end_offset;
> -	}
> +	if (!keep_size && end_offset > file_size)
> +		update_file_size(offset, length);
>  
>  	if (testcalls <= simulatedopcount)
>  		return;
> @@ -1538,10 +1535,8 @@ do_clone_range(unsigned offset, unsigned length, unsigned dest)
>  
>  	log5(OP_CLONE_RANGE, offset, length, dest, FL_NONE);
>  
> -	if (dest > file_size)
> -		memset(good_buf + file_size, '\0', dest - file_size);
>  	if (dest + length > file_size)
> -		file_size = dest + length;
> +		update_file_size(dest, length);
>  
>  	if (testcalls <= simulatedopcount)
>  		return;
> @@ -1757,10 +1752,8 @@ do_copy_range(unsigned offset, unsigned length, unsigned dest)
>  
>  	log5(OP_COPY_RANGE, offset, length, dest, FL_NONE);
>  
> -	if (dest > file_size)
> -		memset(good_buf + file_size, '\0', dest - file_size);
>  	if (dest + length > file_size)
> -		file_size = dest + length;
> +		update_file_size(dest, length);
>  
>  	if (testcalls <= simulatedopcount)
>  		return;
> @@ -1848,7 +1841,7 @@ do_preallocate(unsigned offset, unsigned length, int keep_size)
>  
>  	if (end_offset > file_size) {
>  		memset(good_buf + file_size, '\0', end_offset - file_size);
> -		file_size = end_offset;
> +		update_file_size(offset, length);
>  	}
>  
>  	if (testcalls <= simulatedopcount)
> -- 
> 2.45.0
> 
>