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Linux 6.5 compat: replace generic_file_splice_read with filemap_splice_read 

The generic_file_splice_read function was removed in Linux 6.5 in favor
of filemap_splice_read. Add an autoconf test for filemap_splice_read and
use it if it is found as the handler for .splice_read in the
file_operations struct. Additionally, ITER_PIPE was removed in 6.5. This
change removes the ITER_* macros that OpenZFS doesn't use from being
tested in config/kernel-vfs-iov_iter.m4. The removal of ITER_PIPE was
causing the test to fail, which also affected the code responsible for
setting the .splice_read handler, above. That behavior caused run-time
panics on Linux 6.5.

Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #15155
This commit is contained in:
Coleman Kane 2023-08-07 18:47:46 -04:00 committed by GitHub
parent fdb8fff916
commit 36261c8238
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 32 additions and 2 deletions
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25
config/kernel-filemap-splice-read.m4 Normal file
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@ -0,0 +1,25 @@
AC_DEFUN([ZFS_AC_KERNEL_SRC_FILEMAP_SPLICE_READ], [
dnl #
dnl # Kernel 6.5 - generic_file_splice_read was removed in favor
dnl # of filemap_splice_read for the .splice_read member of the
dnl # file_operations struct.
dnl #
ZFS_LINUX_TEST_SRC([has_filemap_splice_read], [
#include <linux/fs.h>
struct file_operations fops __attribute__((unused)) = {
.splice_read = filemap_splice_read,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_FILEMAP_SPLICE_READ], [
AC_MSG_CHECKING([whether filemap_splice_read() exists])
ZFS_LINUX_TEST_RESULT([has_filemap_splice_read], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FILEMAP_SPLICE_READ, 1,
[filemap_splice_read exists])
],[
AC_MSG_RESULT(no)
])
])

3
config/kernel-vfs-iov_iter.m4
View File

@ -6,8 +6,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
int type __attribute__ ((unused)) =
ITER_IOVEC | ITER_KVEC | ITER_BVEC | ITER_PIPE;
int type __attribute__ ((unused)) = ITER_KVEC;
])
ZFS_LINUX_TEST_SRC([iov_iter_advance], [

2
config/kernel.m4
View File

@ -161,6 +161,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_WRITEPAGE_T
ZFS_AC_KERNEL_SRC_RECLAIMED
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_SRC_FILEMAP_SPLICE_READ
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@ -301,6 +302,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_WRITEPAGE_T
ZFS_AC_KERNEL_RECLAIMED
ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_FILEMAP_SPLICE_READ
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE

4
module/os/linux/zfs/zpl_file.c
View File

@ -1323,7 +1323,11 @@ const struct file_operations zpl_file_operations = {
.read_iter = zpl_iter_read,
.write_iter = zpl_iter_write,
#ifdef HAVE_VFS_IOV_ITER
#ifdef HAVE_FILEMAP_SPLICE_READ
.splice_read = filemap_splice_read,
#else
.splice_read = generic_file_splice_read,
#endif
.splice_write = iter_file_splice_write,
#endif
#else