On Tue, Oct 10, 2017 at 05:58:00AM -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 | 43 ++++++++++++++++++++++++++++++-------------
> m4/package_libcdev.m4 | 16 ++++++++++++++++
> 5 files changed, 52 insertions(+), 13 deletions(-)
>
Looks Ok to me:
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> diff --git a/configure.ac b/configure.ac
> index 4161c3b4..2320e3e3 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -132,6 +132,7 @@ AC_HAVE_GETMNTENT
> AC_HAVE_GETMNTINFO
> AC_HAVE_FALLOCATE
> AC_HAVE_FIEMAP
> +AC_HAVE_PWRITEV2
> AC_HAVE_PREADV
> AC_HAVE_COPY_FILE_RANGE
> AC_HAVE_SYNC_FILE_RANGE
> diff --git a/include/builddefs.in b/include/builddefs.in
> index ec630bd9..cd58ea8e 100644
> --- a/include/builddefs.in
> +++ b/include/builddefs.in
> @@ -103,6 +103,7 @@ HAVE_GETMNTINFO = @have_getmntinfo@
> HAVE_FALLOCATE = @have_fallocate@
> HAVE_FIEMAP = @have_fiemap@
> HAVE_PREADV = @have_preadv@
> +HAVE_PWRITEV2 = @have_pwritev2@
> HAVE_COPY_FILE_RANGE = @have_copy_file_range@
> HAVE_SYNC_FILE_RANGE = @have_sync_file_range@
> HAVE_SYNCFS = @have_syncfs@
> diff --git a/io/Makefile b/io/Makefile
> index 47b0a669..050d6bd0 100644
> --- a/io/Makefile
> +++ b/io/Makefile
> @@ -90,6 +90,10 @@ ifeq ($(HAVE_PREADV),yes)
> LCFLAGS += -DHAVE_PREADV -DHAVE_PWRITEV
> endif
>
> +ifeq ($(HAVE_PWRITEV2),yes)
> +LCFLAGS += -DHAVE_PWRITEV2
> +endif
> +
> ifeq ($(HAVE_READDIR),yes)
> CFILES += readdir.c
> LCFLAGS += -DHAVE_READDIR
> diff --git a/io/pwrite.c b/io/pwrite.c
> index 1c5dfca1..5ceb26c7 100644
> --- a/io/pwrite.c
> +++ b/io/pwrite.c
> @@ -62,7 +62,8 @@ do_pwritev(
> int fd,
> off64_t offset,
> ssize_t count,
> - ssize_t buffer_size)
> + ssize_t buffer_size,
> + int pwritev2_flags)
> {
> int vecs = 0;
> ssize_t oldlen = 0;
> @@ -81,7 +82,14 @@ do_pwritev(
> } else {
> vecs = vectors;
> }
> +#ifdef HAVE_PWRITEV2
> + if (pwritev2_flags)
> + bytes = pwritev2(fd, iov, vectors, offset, pwritev2_flags);
> + else
> + bytes = pwritev(fd, iov, vectors, offset);
> +#else
> bytes = pwritev(fd, iov, vectors, offset);
> +#endif
>
> /* restore trimmed iov */
> if (oldlen)
> @@ -98,12 +106,13 @@ do_pwrite(
> int fd,
> off64_t offset,
> ssize_t count,
> - ssize_t buffer_size)
> + ssize_t buffer_size,
> + int pwritev2_flags)
> {
> if (!vectors)
> return pwrite(fd, buffer, min(count, buffer_size), offset);
>
> - return do_pwritev(fd, offset, count, buffer_size);
> + return do_pwritev(fd, offset, count, buffer_size, pwritev2_flags);
> }
>
> static int
> @@ -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 +143,8 @@ write_random(
> buffersize;
> else
> off = offset;
> - bytes = do_pwrite(file->fd, off, buffersize, buffersize);
> + bytes = do_pwrite(file->fd, off, buffersize, buffersize,
> + pwritev2_flags);
> if (bytes == 0)
> break;
> if (bytes < 0) {
> @@ -153,7 +164,8 @@ 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 +183,8 @@ 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 +202,8 @@ 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 +226,8 @@ 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 +239,7 @@ 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 +273,7 @@ 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 +381,14 @@ 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)
> #
> --
> 2.14.2
>
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