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Linux 5.16: type member of iov_iter renamed iter_type 

The iov_iter->type member was renamed iov_iter->iter_type. However,
while looking into this, realized that in 2018 a iov_iter_type(*iov)
accessor function was introduced. So if that is present, use it,
otherwise fall back to trying the existing behavior of directly
accessing type from iov_iter.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #12819
This commit is contained in:
Coleman Kane 2021-12-02 23:25:08 -05:00 committed by Brian Behlendorf
parent 435a451e5c
commit f6e22561d2
2 changed files with 28 additions and 0 deletions
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22
config/kernel-vfs-iov_iter.m4
View File

@ -74,6 +74,14 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
bytes = copy_from_iter((void *)&buf, size, &iter);
])
ZFS_LINUX_TEST_SRC([iov_iter_type], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
__attribute__((unused)) enum iter_type i = iov_iter_type(&iter);
])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
@ -149,6 +157,20 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
enable_vfs_iov_iter="no"
])
dnl #
dnl # This checks for iov_iter_type() in linux/uio.h. It is not
dnl # required, however, and the module will compiled without it
dnl # using direct access of the member attribute
dnl #
AC_MSG_CHECKING([whether iov_iter_type() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_type], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_TYPE, 1,
[iov_iter_type() is available])
],[
AC_MSG_RESULT(no)
])
dnl #
dnl # As of the 4.9 kernel support is provided for iovecs, kvecs,
dnl # bvecs and pipes in the iov_iter structure. As long as the

6
module/os/linux/zfs/zpl_file.c
View File

@ -250,11 +250,17 @@ zpl_uio_init(zfs_uio_t *uio, struct kiocb *kiocb, struct iov_iter *to,
{
#if defined(HAVE_VFS_IOV_ITER)
zfs_uio_iov_iter_init(uio, to, pos, count, skip);
#else
#ifdef HAVE_IOV_ITER_TYPE
zfs_uio_iovec_init(uio, to->iov, to->nr_segs, pos,
iov_iter_type(to) & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
count, skip);
#else
zfs_uio_iovec_init(uio, to->iov, to->nr_segs, pos,
to->type & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
count, skip);
#endif
#endif
}
static ssize_t