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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
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25
config/kernel-filemap-splice-read.m4
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25
config/kernel-filemap-splice-read.m4
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@ -0,0 +1,25 @@
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AC_DEFUN([ZFS_AC_KERNEL_SRC_FILEMAP_SPLICE_READ], [
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dnl #
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dnl # Kernel 6.5 - generic_file_splice_read was removed in favor
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dnl # of filemap_splice_read for the .splice_read member of the
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dnl # file_operations struct.
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dnl #
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ZFS_LINUX_TEST_SRC([has_filemap_splice_read], [
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#include <linux/fs.h>
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struct file_operations fops __attribute__((unused)) = {
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.splice_read = filemap_splice_read,
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};
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],[])
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])
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AC_DEFUN([ZFS_AC_KERNEL_FILEMAP_SPLICE_READ], [
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AC_MSG_CHECKING([whether filemap_splice_read() exists])
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ZFS_LINUX_TEST_RESULT([has_filemap_splice_read], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_FILEMAP_SPLICE_READ, 1,
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[filemap_splice_read exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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@ -6,8 +6,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
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#include <linux/fs.h>
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#include <linux/uio.h>
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],[
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int type __attribute__ ((unused)) =
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ITER_IOVEC | ITER_KVEC | ITER_BVEC | ITER_PIPE;
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int type __attribute__ ((unused)) = ITER_KVEC;
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])
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ZFS_LINUX_TEST_SRC([iov_iter_advance], [
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@ -161,6 +161,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
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ZFS_AC_KERNEL_SRC_WRITEPAGE_T
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ZFS_AC_KERNEL_SRC_RECLAIMED
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ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
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ZFS_AC_KERNEL_SRC_FILEMAP_SPLICE_READ
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case "$host_cpu" in
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powerpc*)
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ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
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@ -301,6 +302,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
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ZFS_AC_KERNEL_WRITEPAGE_T
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ZFS_AC_KERNEL_RECLAIMED
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ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
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ZFS_AC_KERNEL_FILEMAP_SPLICE_READ
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case "$host_cpu" in
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powerpc*)
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ZFS_AC_KERNEL_CPU_HAS_FEATURE
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@ -1323,7 +1323,11 @@ const struct file_operations zpl_file_operations = {
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.read_iter = zpl_iter_read,
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.write_iter = zpl_iter_write,
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#ifdef HAVE_VFS_IOV_ITER
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#ifdef HAVE_FILEMAP_SPLICE_READ
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.splice_read = filemap_splice_read,
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#else
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.splice_read = generic_file_splice_read,
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#endif
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.splice_write = iter_file_splice_write,
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#endif
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#else
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