Re: [PATCH 2/3] generic/436: round up bufsz to nearest filesystem blksz

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

On Mon, May 06, 2024 at 05:01:18PM +0200, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@samsung.com>
> 
> SEEK_HOLE and SEEK_DATA work in filesystem block size granularity. So
> while filling up the buffer for test 13 - 16, round up the bufsz to the
> closest filesystem blksz.
> 
> As we only allowed blocksizes lower than the pagesize, this was never an
> issue and it always aligned. Once we have blocksize > pagesize, this
> assumption will break.
> 
> Fixes the test for LBS configuration.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
> ---
>  src/seek_sanity_test.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/src/seek_sanity_test.c b/src/seek_sanity_test.c
> index 48b3ccc0..bc30f77c 100644
> --- a/src/seek_sanity_test.c
> +++ b/src/seek_sanity_test.c
> @@ -541,7 +541,7 @@ static int test16(int fd, int testnum)
>  {
>  	int ret = 0;
>  	char *buf = NULL;
> -	int bufsz = sysconf(_SC_PAGE_SIZE);
> +	int bufsz = roundup(sysconf(_SC_PAGE_SIZE) * 14, alloc_size);

Why is the page size multiplied by 14?

--D

>  	int filsz = 4 << 20;
>  
>  	if (!unwritten_extents) {
> @@ -591,7 +591,7 @@ static int test15(int fd, int testnum)
>  {
>  	int ret = 0;
>  	char *buf = NULL;
> -	int bufsz = sysconf(_SC_PAGE_SIZE);
> +	int bufsz = roundup(sysconf(_SC_PAGE_SIZE) * 14, alloc_size);
>  	int filsz = 4 << 20;
>  
>  	if (!unwritten_extents) {
> @@ -643,7 +643,7 @@ static int test14(int fd, int testnum)
>  {
>  	int ret = 0;
>  	char *buf = NULL;
> -	int bufsz = sysconf(_SC_PAGE_SIZE) * 14;
> +	int bufsz = roundup(sysconf(_SC_PAGE_SIZE) * 14, alloc_size);
>  	int filsz = 4 << 20;
>  
>  	if (!unwritten_extents) {
> @@ -692,7 +692,7 @@ static int test13(int fd, int testnum)
>  {
>  	int ret = 0;
>  	char *buf = NULL;
> -	int bufsz = sysconf(_SC_PAGE_SIZE) * 14;
> +	int bufsz = roundup(sysconf(_SC_PAGE_SIZE) * 14, alloc_size);
>  	int filsz = 4 << 20;
>  
>  	if (!unwritten_extents) {
> -- 
> 2.34.1
>