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linux: implement filesystem-side copy/clone functions for EL7

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Redhat have backported copy_file_range and clone_file_range to the EL7
kernel using an "extended file operations" wrapper structure. This
connects all that up to let cloning work there too.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kay Pedersen <mail@mkwg.de>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-By: OpenDrives Inc.
Sponsored-By: Klara Inc.
Closes #15050
This commit is contained in:
Rob Norris
2023-06-25 20:50:19 +10:00
committed by Brian Behlendorf
parent 9927f219f1
commit 6b0a4be5fe
7 changed files with 90 additions and 8 deletions
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config/kernel-vfs-extended-file_range.m4
+50
View File
@@ -0,0 +1,50 @@
dnl #
dnl # EL7 have backported copy_file_range and clone_file_range and
dnl # added them to an "extended" file_operations struct.
dnl #
dnl # We're testing for both functions in one here, because they will only
dnl # ever appear together and we don't want to match a similar method in
dnl # some future vendor kernel.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND], [
ZFS_LINUX_TEST_SRC([vfs_file_operations_extend], [
#include <linux/fs.h>
static ssize_t test_copy_file_range(struct file *src_file,
loff_t src_off, struct file *dst_file, loff_t dst_off,
size_t len, unsigned int flags) {
(void) src_file; (void) src_off;
(void) dst_file; (void) dst_off;
(void) len; (void) flags;
return (0);
}
static int test_clone_file_range(struct file *src_file,
loff_t src_off, struct file *dst_file, loff_t dst_off,
u64 len) {
(void) src_file; (void) src_off;
(void) dst_file; (void) dst_off;
(void) len;
return (0);
}
static const struct file_operations_extend
fops __attribute__ ((unused)) = {
.kabi_fops = {},
.copy_file_range = test_copy_file_range,
.clone_file_range = test_clone_file_range,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND], [
AC_MSG_CHECKING([whether file_operations_extend takes \
.copy_file_range() and .clone_file_range()])
ZFS_LINUX_TEST_RESULT([vfs_file_operations_extend], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_FILE_OPERATIONS_EXTEND, 1,
[file_operations_extend takes .copy_file_range()
and .clone_file_range()])
],[
AC_MSG_RESULT([no])
])
])
config/kernel.m4
+2
View File
@@ -121,6 +121,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_VFS_REMAP_FILE_RANGE
ZFS_AC_KERNEL_SRC_VFS_CLONE_FILE_RANGE
ZFS_AC_KERNEL_SRC_VFS_DEDUPE_FILE_RANGE
ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND
ZFS_AC_KERNEL_SRC_KMAP_ATOMIC_ARGS
ZFS_AC_KERNEL_SRC_FOLLOW_DOWN_ONE
ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN
@@ -259,6 +260,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE
ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE
ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE
ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND
ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
ZFS_AC_KERNEL_MAKE_REQUEST_FN