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Linux 6.4 compat: iter_iov() function now used to get old iov member 

The iov_iter->iov member is now iov_iter->__iov and must be accessed via
the accessor function iter_iov(). Create a wrapper that is conditionally
compiled to use the access method appropriate for the target kernel
version.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #15100
This commit is contained in:
Coleman Kane 2023-07-23 01:34:29 -04:00 committed by Tony Hutter
parent 7c0618bdb7
commit feb0fa6b38
3 changed files with 32 additions and 5 deletions
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23
config/kernel-vfs-iov_iter.m4
View File

@ -93,6 +93,14 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
struct iov_iter iter = { 0 };
__attribute__((unused)) enum iter_type i = iov_iter_type(&iter);
])
ZFS_LINUX_TEST_SRC([iter_iov], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
__attribute__((unused)) const struct iovec *iov = iter_iov(&iter);
])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
@ -201,4 +209,19 @@ AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
AC_DEFINE(HAVE_VFS_IOV_ITER, 1,
[All required iov_iter interfaces are available])
])
dnl #
dnl # Kernel 6.5 introduces the iter_iov() function that returns the
dnl # __iov member of an iov_iter*. The iov member was renamed to this
dnl # __iov member, and is intended to be accessed via the helper
dnl # function now.
dnl #
AC_MSG_CHECKING([whether iter_iov() is available])
ZFS_LINUX_TEST_RESULT([iter_iov], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ITER_IOV, 1,
[iter_iov() is available])
],[
AC_MSG_RESULT(no)
])
])

6
include/os/linux/spl/sys/uio.h
View File

@ -146,4 +146,10 @@ zfs_uio_iov_iter_init(zfs_uio_t *uio, struct iov_iter *iter, offset_t offset,
}
#endif
#if defined(HAVE_ITER_IOV)
#define zfs_uio_iter_iov(iter) iter_iov((iter))
#else
#define zfs_uio_iter_iov(iter) (iter)->iov
#endif
#endif /* SPL_UIO_H */

8
module/os/linux/zfs/zpl_file.c
View File

@ -293,17 +293,15 @@ 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,
#elif defined(HAVE_IOV_ITER_TYPE)
zfs_uio_iovec_init(uio, zfs_uio_iter_iov(to), 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,
zfs_uio_iovec_init(uio, zfs_uio_iter_iov(to), to->nr_segs, pos,
to->type & ITER_KVEC ? UIO_SYSSPACE : UIO_USERSPACE,
count, skip);
#endif
#endif
}
static ssize_t