On Fri, Sep 29, 2017 at 08:00:33AM -0500, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
>
> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
> ---
> configure.ac | 1 +
> include/builddefs.in | 1 +
> io/Makefile | 4 ++++
> io/pwrite.c | 39 ++++++++++++++++++++++++++-------------
> m4/package_libcdev.m4 | 16 ++++++++++++++++
> 5 files changed, 48 insertions(+), 13 deletions(-)
>
...
> diff --git a/io/pwrite.c b/io/pwrite.c
> index 1c5dfca1..e7d411bb 100644
> --- a/io/pwrite.c
> +++ b/io/pwrite.c
...
> @@ -111,7 +120,8 @@ write_random(
> off64_t offset,
> long long count,
> unsigned int seed,
> - long long *total)
> + long long *total,
> + int pwritev2_flags)
> {
> off64_t off, range;
> ssize_t bytes;
> @@ -133,7 +143,7 @@ write_random(
> buffersize;
> else
> off = offset;
> - bytes = do_pwrite(file->fd, off, buffersize, buffersize);
> + bytes = do_pwrite(file->fd, off, buffersize, buffersize, pwritev2_flags);
Looks like a couple or so long lines here and below. We usually wrap
lines at 80 chars. Otherwise this seems fine to me.
Brian
> if (bytes == 0)
> break;
> if (bytes < 0) {
> @@ -153,7 +163,8 @@ static int
> write_backward(
> off64_t offset,
> long long *count,
> - long long *total)
> + long long *total,
> + int pwritev2_flags)
> {
> off64_t end, off = offset;
> ssize_t bytes = 0, bytes_requested;
> @@ -171,7 +182,7 @@ write_backward(
> if ((bytes_requested = (off % buffersize))) {
> bytes_requested = min(cnt, bytes_requested);
> off -= bytes_requested;
> - bytes = do_pwrite(file->fd, off, bytes_requested, buffersize);
> + bytes = do_pwrite(file->fd, off, bytes_requested, buffersize, pwritev2_flags);
> if (bytes == 0)
> return ops;
> if (bytes < 0) {
> @@ -189,7 +200,7 @@ write_backward(
> while (cnt > end) {
> bytes_requested = min(cnt, buffersize);
> off -= bytes_requested;
> - bytes = do_pwrite(file->fd, off, cnt, buffersize);
> + bytes = do_pwrite(file->fd, off, cnt, buffersize, pwritev2_flags);
> if (bytes == 0)
> break;
> if (bytes < 0) {
> @@ -212,7 +223,8 @@ write_buffer(
> size_t bs,
> int fd,
> off64_t skip,
> - long long *total)
> + long long *total,
> + int pwritev2_flags)
> {
> ssize_t bytes;
> long long bar = min(bs, count);
> @@ -224,7 +236,7 @@ write_buffer(
> if (read_buffer(fd, skip + *total, bs, &bar, 0, 1) < 0)
> break;
> }
> - bytes = do_pwrite(file->fd, offset, count, bar);
> + bytes = do_pwrite(file->fd, offset, count, bar, pwritev2_flags);
> if (bytes == 0)
> break;
> if (bytes < 0) {
> @@ -258,6 +270,7 @@ pwrite_f(
> int Cflag, qflag, uflag, dflag, wflag, Wflag;
> int direction = IO_FORWARD;
> int c, fd = -1;
> + int pwritev2_flags = 0;
>
> Cflag = qflag = uflag = dflag = wflag = Wflag = 0;
> init_cvtnum(&fsblocksize, &fssectsize);
> @@ -365,13 +378,13 @@ pwrite_f(
> case IO_RANDOM:
> if (!zeed) /* srandom seed */
> zeed = time(NULL);
> - c = write_random(offset, count, zeed, &total);
> + c = write_random(offset, count, zeed, &total, pwritev2_flags);
> break;
> case IO_FORWARD:
> - c = write_buffer(offset, count, bsize, fd, skip, &total);
> + c = write_buffer(offset, count, bsize, fd, skip, &total, pwritev2_flags);
> break;
> case IO_BACKWARD:
> - c = write_backward(offset, &count, &total);
> + c = write_backward(offset, &count, &total, pwritev2_flags);
> break;
> default:
> total = 0;
> diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
> index fa5b6397..48da0783 100644
> --- a/m4/package_libcdev.m4
> +++ b/m4/package_libcdev.m4
> @@ -146,6 +146,22 @@ AC_DEFUN([AC_HAVE_PREADV],
> AC_SUBST(have_preadv)
> ])
>
> +#
> +# Check if we have a pwritev2 libc call (Linux)
> +#
> +AC_DEFUN([AC_HAVE_PWRITEV2],
> + [ AC_MSG_CHECKING([for pwritev2])
> + AC_TRY_LINK([
> +#define _BSD_SOURCE
> +#include <sys/uio.h>
> + ], [
> + pwritev2(0, 0, 0, 0, 0);
> + ], have_pwritev2=yes
> + AC_MSG_RESULT(yes),
> + AC_MSG_RESULT(no))
> + AC_SUBST(have_pwritev2)
> + ])
> +
> #
> # Check if we have a copy_file_range system call (Linux)
> #
> --
> 2.14.1
>
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