c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2024-11-17 10:01:01 +03:00
Code Issues Packages Projects Releases Wiki Activity
a10e552b99
mirror_zfs/config/kernel.m4
Brian Atkinson a10e552b99
Adding Direct IO Support 
Adding O_DIRECT support to ZFS to bypass the ARC for writes/reads.

O_DIRECT support in ZFS will always ensure there is coherency between
buffered and O_DIRECT IO requests. This ensures that all IO requests,
whether buffered or direct, will see the same file contents at all
times. Just as in other FS's , O_DIRECT does not imply O_SYNC. While
data is written directly to VDEV disks, metadata will not be synced
until the associated  TXG is synced.
For both O_DIRECT read and write request the offset and request sizes,
at a minimum, must be PAGE_SIZE aligned. In the event they are not,
then EINVAL is returned unless the direct property is set to always (see
below).

For O_DIRECT writes:
The request also must be block aligned (recordsize) or the write
request will take the normal (buffered) write path. In the event that
request is block aligned and a cached copy of the buffer in the ARC,
then it will be discarded from the ARC forcing all further reads to
retrieve the data from disk.

For O_DIRECT reads:
The only alignment restrictions are PAGE_SIZE alignment. In the event
that the requested data is in buffered (in the ARC) it will just be
copied from the ARC into the user buffer.

For both O_DIRECT writes and reads the O_DIRECT flag will be ignored in
the event that file contents are mmap'ed. In this case, all requests
that are at least PAGE_SIZE aligned will just fall back to the buffered
paths. If the request however is not PAGE_SIZE aligned, EINVAL will
be returned as always regardless if the file's contents are mmap'ed.

Since O_DIRECT writes go through the normal ZIO pipeline, the
following operations are supported just as with normal buffered writes:
Checksum
Compression
Encryption
Erasure Coding
There is one caveat for the data integrity of O_DIRECT writes that is
distinct for each of the OS's supported by ZFS.
FreeBSD - FreeBSD is able to place user pages under write protection so
          any data in the user buffers and written directly down to the
	  VDEV disks is guaranteed to not change. There is no concern
	  with data integrity and O_DIRECT writes.
Linux - Linux is not able to place anonymous user pages under write
        protection. Because of this, if the user decides to manipulate
	the page contents while the write operation is occurring, data
	integrity can not be guaranteed. However, there is a module
	parameter `zfs_vdev_direct_write_verify` that controls the
	if a O_DIRECT writes that can occur to a top-level VDEV before
	a checksum verify is run before the contents of the I/O buffer
        are committed to disk. In the event of a checksum verification
	failure the write will return EIO. The number of O_DIRECT write
	checksum verification errors can be observed by doing
	`zpool status -d`, which will list all verification errors that
	have occurred on a top-level VDEV. Along with `zpool status`, a
	ZED event will be issues as `dio_verify` when a checksum
	verification error occurs.

ZVOLs and dedup is not currently supported with Direct I/O.

A new dataset property `direct` has been added with the following 3
allowable values:
disabled - Accepts O_DIRECT flag, but silently ignores it and treats
	   the request as a buffered IO request.
standard - Follows the alignment restrictions  outlined above for
	   write/read IO requests when the O_DIRECT flag is used.
always   - Treats every write/read IO request as though it passed
           O_DIRECT and will do O_DIRECT if the alignment restrictions
	   are met otherwise will redirect through the ARC. This
	   property will not allow a request to fail.

There is also a module parameter zfs_dio_enabled that can be used to
force all reads and writes through the ARC. By setting this module
parameter to 0, it mimics as if the  direct dataset property is set to
disabled.

Reviewed-by: Brian Behlendorf <behlendorf@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Atkinson <batkinson@lanl.gov>
Co-authored-by: Mark Maybee <mark.maybee@delphix.com>
Co-authored-by: Matt Macy <mmacy@FreeBSD.org>
Co-authored-by: Brian Behlendorf <behlendorf@llnl.gov>
Closes #10018
2024-09-14 13:47:59 -07:00

1061 lines
30 KiB
Plaintext
Raw Blame History

dnl #
dnl # Default ZFS kernel configuration
dnl #
AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
AM_COND_IF([BUILD_LINUX], [
dnl # Setup the kernel build environment.
ZFS_AC_KERNEL
ZFS_AC_QAT
dnl # Sanity checks for module building and CONFIG_* defines
ZFS_AC_KERNEL_CONFIG_DEFINED
ZFS_AC_MODULE_SYMVERS
dnl # Sequential ZFS_LINUX_TRY_COMPILE tests
ZFS_AC_KERNEL_FPU_HEADER
ZFS_AC_KERNEL_OBJTOOL_HEADER
ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T
ZFS_AC_KERNEL_MISC_MINOR
ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
dnl # Parallel ZFS_LINUX_TEST_SRC / ZFS_LINUX_TEST_RESULT tests
ZFS_AC_KERNEL_TEST_SRC
ZFS_AC_KERNEL_TEST_RESULT
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
KERNEL_MAKE="$KERNEL_MAKE O=$LINUX_OBJ"
])
AC_SUBST(KERNEL_MAKE)
])
])
dnl #
dnl # Generate and compile all of the kernel API test cases to determine
dnl # which interfaces are available. By invoking the kernel build system
dnl # only once the compilation can be done in parallel significantly
dnl # speeding up the process.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_TYPES
ZFS_AC_KERNEL_SRC_OBJTOOL
ZFS_AC_KERNEL_SRC_GLOBAL_PAGE_STATE
ZFS_AC_KERNEL_SRC_ACCESS_OK_TYPE
ZFS_AC_KERNEL_SRC_PDE_DATA
ZFS_AC_KERNEL_SRC_FALLOCATE
ZFS_AC_KERNEL_SRC_FADVISE
ZFS_AC_KERNEL_SRC_GENERIC_FADVISE
ZFS_AC_KERNEL_SRC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
ZFS_AC_KERNEL_SRC_RWSEM
ZFS_AC_KERNEL_SRC_SCHED
ZFS_AC_KERNEL_SRC_USLEEP_RANGE
ZFS_AC_KERNEL_SRC_KMEM_CACHE
ZFS_AC_KERNEL_SRC_KVMALLOC
ZFS_AC_KERNEL_SRC_VMALLOC_PAGE_KERNEL
ZFS_AC_KERNEL_SRC_WAIT
ZFS_AC_KERNEL_SRC_INODE_TIMES
ZFS_AC_KERNEL_SRC_INODE_LOCK
ZFS_AC_KERNEL_SRC_GROUP_INFO_GID
ZFS_AC_KERNEL_SRC_RW
ZFS_AC_KERNEL_SRC_TIMER_SETUP
ZFS_AC_KERNEL_SRC_SUPER_USER_NS
ZFS_AC_KERNEL_SRC_PROC_OPERATIONS
ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS
ZFS_AC_KERNEL_SRC_BIO
ZFS_AC_KERNEL_SRC_BLKDEV
ZFS_AC_KERNEL_SRC_BLK_QUEUE
ZFS_AC_KERNEL_SRC_GENHD_FLAGS
ZFS_AC_KERNEL_SRC_REVALIDATE_DISK
ZFS_AC_KERNEL_SRC_GET_DISK_RO
ZFS_AC_KERNEL_SRC_GENERIC_READLINK_GLOBAL
ZFS_AC_KERNEL_SRC_DISCARD_GRANULARITY
ZFS_AC_KERNEL_SRC_INODE_OWNER_OR_CAPABLE
ZFS_AC_KERNEL_SRC_XATTR
ZFS_AC_KERNEL_SRC_ACL
ZFS_AC_KERNEL_SRC_INODE_SETATTR
ZFS_AC_KERNEL_SRC_INODE_GETATTR
ZFS_AC_KERNEL_SRC_INODE_SET_FLAGS
ZFS_AC_KERNEL_SRC_INODE_SET_IVERSION
ZFS_AC_KERNEL_SRC_SHOW_OPTIONS
ZFS_AC_KERNEL_SRC_FILE_INODE
ZFS_AC_KERNEL_SRC_FILE_DENTRY
ZFS_AC_KERNEL_SRC_FILEMAP
ZFS_AC_KERNEL_SRC_FSYNC
ZFS_AC_KERNEL_SRC_AIO_FSYNC
ZFS_AC_KERNEL_SRC_EVICT_INODE
ZFS_AC_KERNEL_SRC_DIRTY_INODE
ZFS_AC_KERNEL_SRC_SHRINKER
ZFS_AC_KERNEL_SRC_MKDIR
ZFS_AC_KERNEL_SRC_LOOKUP_FLAGS
ZFS_AC_KERNEL_SRC_CREATE
ZFS_AC_KERNEL_SRC_PERMISSION
ZFS_AC_KERNEL_SRC_GET_LINK
ZFS_AC_KERNEL_SRC_PUT_LINK
ZFS_AC_KERNEL_SRC_TMPFILE
ZFS_AC_KERNEL_SRC_AUTOMOUNT
ZFS_AC_KERNEL_SRC_ENCODE_FH_WITH_INODE
ZFS_AC_KERNEL_SRC_COMMIT_METADATA
ZFS_AC_KERNEL_SRC_CLEAR_INODE
ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
ZFS_AC_KERNEL_SRC_DENTRY
ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U
ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
ZFS_AC_KERNEL_SRC_SECURITY_INODE
ZFS_AC_KERNEL_SRC_FST_MOUNT
ZFS_AC_KERNEL_SRC_BDI
ZFS_AC_KERNEL_SRC_SET_NLINK
ZFS_AC_KERNEL_SRC_SGET
ZFS_AC_KERNEL_SRC_LSEEK_EXECUTE
ZFS_AC_KERNEL_SRC_VFS_FILEMAP_DIRTY_FOLIO
ZFS_AC_KERNEL_SRC_VFS_READ_FOLIO
ZFS_AC_KERNEL_SRC_VFS_GETATTR
ZFS_AC_KERNEL_SRC_VFS_FSYNC_2ARGS
ZFS_AC_KERNEL_SRC_VFS_ITERATE
ZFS_AC_KERNEL_SRC_GET_USER_PAGES
ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO
ZFS_AC_KERNEL_SRC_VFS_READPAGES
ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_SRC_VFS_RW_ITERATE
ZFS_AC_KERNEL_SRC_VFS_GENERIC_WRITE_CHECKS
ZFS_AC_KERNEL_SRC_VFS_IOV_ITER
ZFS_AC_KERNEL_SRC_VFS_COPY_FILE_RANGE
ZFS_AC_KERNEL_SRC_VFS_GENERIC_COPY_FILE_RANGE
ZFS_AC_KERNEL_SRC_VFS_SPLICE_COPY_FILE_RANGE
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_KMAP_LOCAL_PAGE
ZFS_AC_KERNEL_SRC_FOLLOW_DOWN_ONE
ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN
ZFS_AC_KERNEL_SRC_GENERIC_IO_ACCT
ZFS_AC_KERNEL_SRC_FPU
ZFS_AC_KERNEL_SRC_FMODE_T
ZFS_AC_KERNEL_SRC_KUIDGID_T
ZFS_AC_KERNEL_SRC_KUID_HELPERS
ZFS_AC_KERNEL_SRC_RENAME
ZFS_AC_KERNEL_SRC_CURRENT_TIME
ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES
ZFS_AC_KERNEL_SRC_IN_COMPAT_SYSCALL
ZFS_AC_KERNEL_SRC_KTIME
ZFS_AC_KERNEL_SRC_TOTALRAM_PAGES_FUNC
ZFS_AC_KERNEL_SRC_TOTALHIGH_PAGES
ZFS_AC_KERNEL_SRC_KSTRTOUL
ZFS_AC_KERNEL_SRC_PERCPU
ZFS_AC_KERNEL_SRC_CPU_HOTPLUG
ZFS_AC_KERNEL_SRC_GENERIC_FILLATTR
ZFS_AC_KERNEL_SRC_MKNOD
ZFS_AC_KERNEL_SRC_SYMLINK
ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS
ZFS_AC_KERNEL_SRC_SIGNAL_STOP
ZFS_AC_KERNEL_SRC_SIGINFO
ZFS_AC_KERNEL_SRC_SYSFS
ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_SRC_STRLCPY
ZFS_AC_KERNEL_SRC_STRSCPY
ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT
ZFS_AC_KERNEL_SRC_ADD_DISK
ZFS_AC_KERNEL_SRC_KTHREAD
ZFS_AC_KERNEL_SRC_ZERO_PAGE
ZFS_AC_KERNEL_SRC___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_SRC_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
ZFS_AC_KERNEL_SRC_IDMAP_NO_USERNS
ZFS_AC_KERNEL_SRC_IATTR_VFSID
ZFS_AC_KERNEL_SRC_FILEMAP
ZFS_AC_KERNEL_SRC_WRITEPAGE_T
ZFS_AC_KERNEL_SRC_RECLAIMED
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_SZ
ZFS_AC_KERNEL_SRC_PROC_HANDLER_CTL_TABLE_CONST
ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ
ZFS_AC_KERNEL_SRC_SYNC_BDEV
ZFS_AC_KERNEL_SRC_MM_PAGE_SIZE
ZFS_AC_KERNEL_SRC_MM_PAGE_MAPPING
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE
;;
riscv*)
ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE
;;
esac
AC_MSG_CHECKING([for available kernel interfaces])
ZFS_LINUX_TEST_COMPILE_ALL([kabi])
AC_MSG_RESULT([done])
])
dnl #
dnl # Check results of kernel interface tests.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_TYPES
ZFS_AC_KERNEL_ACCESS_OK_TYPE
ZFS_AC_KERNEL_GLOBAL_PAGE_STATE
ZFS_AC_KERNEL_OBJTOOL
ZFS_AC_KERNEL_PDE_DATA
ZFS_AC_KERNEL_FALLOCATE
ZFS_AC_KERNEL_FADVISE
ZFS_AC_KERNEL_GENERIC_FADVISE
ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
ZFS_AC_KERNEL_RWSEM
ZFS_AC_KERNEL_SCHED
ZFS_AC_KERNEL_USLEEP_RANGE
ZFS_AC_KERNEL_KMEM_CACHE
ZFS_AC_KERNEL_KVMALLOC
ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
ZFS_AC_KERNEL_WAIT
ZFS_AC_KERNEL_INODE_TIMES
ZFS_AC_KERNEL_INODE_LOCK
ZFS_AC_KERNEL_GROUP_INFO_GID
ZFS_AC_KERNEL_RW
ZFS_AC_KERNEL_TIMER_SETUP
ZFS_AC_KERNEL_SUPER_USER_NS
ZFS_AC_KERNEL_PROC_OPERATIONS
ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS
ZFS_AC_KERNEL_BIO
ZFS_AC_KERNEL_BLKDEV
ZFS_AC_KERNEL_BLK_QUEUE
ZFS_AC_KERNEL_GENHD_FLAGS
ZFS_AC_KERNEL_REVALIDATE_DISK
ZFS_AC_KERNEL_GET_DISK_RO
ZFS_AC_KERNEL_GENERIC_READLINK_GLOBAL
ZFS_AC_KERNEL_DISCARD_GRANULARITY
ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
ZFS_AC_KERNEL_XATTR
ZFS_AC_KERNEL_ACL
ZFS_AC_KERNEL_INODE_SETATTR
ZFS_AC_KERNEL_INODE_GETATTR
ZFS_AC_KERNEL_INODE_SET_FLAGS
ZFS_AC_KERNEL_INODE_SET_IVERSION
ZFS_AC_KERNEL_SHOW_OPTIONS
ZFS_AC_KERNEL_FILE_INODE
ZFS_AC_KERNEL_FILE_DENTRY
ZFS_AC_KERNEL_FILEMAP
ZFS_AC_KERNEL_FSYNC
ZFS_AC_KERNEL_AIO_FSYNC
ZFS_AC_KERNEL_EVICT_INODE
ZFS_AC_KERNEL_DIRTY_INODE
ZFS_AC_KERNEL_SHRINKER
ZFS_AC_KERNEL_MKDIR
ZFS_AC_KERNEL_LOOKUP_FLAGS
ZFS_AC_KERNEL_CREATE
ZFS_AC_KERNEL_PERMISSION
ZFS_AC_KERNEL_GET_LINK
ZFS_AC_KERNEL_PUT_LINK
ZFS_AC_KERNEL_TMPFILE
ZFS_AC_KERNEL_AUTOMOUNT
ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
ZFS_AC_KERNEL_COMMIT_METADATA
ZFS_AC_KERNEL_CLEAR_INODE
ZFS_AC_KERNEL_SETATTR_PREPARE
ZFS_AC_KERNEL_INSERT_INODE_LOCKED
ZFS_AC_KERNEL_DENTRY
ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
ZFS_AC_KERNEL_TRUNCATE_SETSIZE
ZFS_AC_KERNEL_SECURITY_INODE
ZFS_AC_KERNEL_FST_MOUNT
ZFS_AC_KERNEL_BDI
ZFS_AC_KERNEL_SET_NLINK
ZFS_AC_KERNEL_SGET
ZFS_AC_KERNEL_LSEEK_EXECUTE
ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
ZFS_AC_KERNEL_VFS_READ_FOLIO
ZFS_AC_KERNEL_VFS_GETATTR
ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
ZFS_AC_KERNEL_VFS_ITERATE
ZFS_AC_KERNEL_GET_USER_PAGES
ZFS_AC_KERNEL_VFS_DIRECT_IO
ZFS_AC_KERNEL_VFS_READPAGES
ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_VFS_RW_ITERATE
ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
ZFS_AC_KERNEL_VFS_IOV_ITER
ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE
ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE
ZFS_AC_KERNEL_VFS_SPLICE_COPY_FILE_RANGE
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_KMAP_LOCAL_PAGE
ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
ZFS_AC_KERNEL_MAKE_REQUEST_FN
ZFS_AC_KERNEL_GENERIC_IO_ACCT
ZFS_AC_KERNEL_FPU
ZFS_AC_KERNEL_FMODE_T
ZFS_AC_KERNEL_KUIDGID_T
ZFS_AC_KERNEL_KUID_HELPERS
ZFS_AC_KERNEL_RENAME
ZFS_AC_KERNEL_CURRENT_TIME
ZFS_AC_KERNEL_USERNS_CAPABILITIES
ZFS_AC_KERNEL_IN_COMPAT_SYSCALL
ZFS_AC_KERNEL_KTIME
ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
ZFS_AC_KERNEL_TOTALHIGH_PAGES
ZFS_AC_KERNEL_KSTRTOUL
ZFS_AC_KERNEL_PERCPU
ZFS_AC_KERNEL_CPU_HOTPLUG
ZFS_AC_KERNEL_GENERIC_FILLATTR
ZFS_AC_KERNEL_MKNOD
ZFS_AC_KERNEL_SYMLINK
ZFS_AC_KERNEL_BIO_MAX_SEGS
ZFS_AC_KERNEL_SIGNAL_STOP
ZFS_AC_KERNEL_SIGINFO
ZFS_AC_KERNEL_SYSFS
ZFS_AC_KERNEL_SET_SPECIAL_STATE
ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_STRLCPY
ZFS_AC_KERNEL_STRSCPY
ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
ZFS_AC_KERNEL_ADD_DISK
ZFS_AC_KERNEL_KTHREAD
ZFS_AC_KERNEL_ZERO_PAGE
ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_IDMAP_MNT_API
ZFS_AC_KERNEL_IDMAP_NO_USERNS
ZFS_AC_KERNEL_IATTR_VFSID
ZFS_AC_KERNEL_FILEMAP
ZFS_AC_KERNEL_WRITEPAGE_T
ZFS_AC_KERNEL_RECLAIMED
ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_REGISTER_SYSCTL_SZ
ZFS_AC_KERNEL_PROC_HANDLER_CTL_TABLE_CONST
ZFS_AC_KERNEL_COPY_SPLICE_READ
ZFS_AC_KERNEL_SYNC_BDEV
ZFS_AC_KERNEL_MM_PAGE_SIZE
ZFS_AC_KERNEL_MM_PAGE_MAPPING
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE
ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
;;
riscv*)
ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE
;;
esac
])
dnl #
dnl # Detect name used for Module.symvers file in kernel
dnl #
AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
modpost=$LINUX/scripts/Makefile.modpost
AC_MSG_CHECKING([kernel file name for module symbols])
AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
AS_IF([grep -q Modules.symvers $modpost], [
LINUX_SYMBOLS=Modules.symvers
], [
LINUX_SYMBOLS=Module.symvers
])
AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
AC_MSG_ERROR([
*** Please make sure the kernel devel package for your distribution
*** is installed. If you are building with a custom kernel, make sure
*** the kernel is configured, built, and the '--with-linux=PATH'
*** configure option refers to the location of the kernel source.
])
])
], [
LINUX_SYMBOLS=NONE
])
AC_MSG_RESULT($LINUX_SYMBOLS)
AC_SUBST(LINUX_SYMBOLS)
])
dnl #
dnl # Detect the kernel to be built against
dnl #
dnl # Most modern Linux distributions have separate locations for bare
dnl # source (source) and prebuilt (build) files. Additionally, there are
dnl # `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)`
dnl # pointing to them. The directory search order is now:
dnl #
dnl # - `configure` command line values if both `--with-linux` and
dnl # `--with-linux-obj` were defined
dnl #
dnl # - If only `--with-linux` was defined, `--with-linux-obj` is assumed
dnl # to have the same value as `--with-linux`
dnl #
dnl # - If neither `--with-linux` nor `--with-linux-obj` were defined
dnl # autodetection is used:
dnl #
dnl # - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist.
dnl #
dnl # - If only `/lib/modules/$(uname -r)/build` exists, it is assumed
dnl # to be both source and build directory.
dnl #
dnl # - The first directory in `/lib/modules` with the highest version
dnl # number according to `sort -V` which contains both `source` and
dnl # `build` symlinks/directories. If module directory contains only
dnl # `build` component, it is assumed to be both source and build
dnl # directory.
dnl #
dnl # - Last resort: the first directory matching `/usr/src/kernels/*`
dnl # and `/usr/src/linux-*` with the highest version number according
dnl # to `sort -V` is assumed to be both source and build directory.
dnl #
AC_DEFUN([ZFS_AC_KERNEL], [
AC_ARG_WITH([linux],
AS_HELP_STRING([--with-linux=PATH],
[Path to kernel source]),
[kernelsrc="$withval"])
AC_ARG_WITH(linux-obj,
AS_HELP_STRING([--with-linux-obj=PATH],
[Path to kernel build objects]),
[kernelbuild="$withval"])
AC_MSG_CHECKING([kernel source and build directories])
AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [
kernelbuild="$kernelsrc"
], [test -z "$kernelsrc"], [
AS_IF([test -e "/lib/modules/$(uname -r)/source" && \
test -e "/lib/modules/$(uname -r)/build"], [
src="/lib/modules/$(uname -r)/source"
build="/lib/modules/$(uname -r)/build"
], [test -e "/lib/modules/$(uname -r)/build"], [
build="/lib/modules/$(uname -r)/build"
src="$build"
], [
src=
for d in $(ls -1d /lib/modules/* 2>/dev/null | sort -Vr); do
if test -e "$d/source" && test -e "$d/build"; then
src="$d/source"
build="$d/build"
break
fi
if test -e "$d/build"; then
src="$d/build"
build="$d/build"
break
fi
done
# the least reliable method
if test -z "$src"; then
src=$(ls -1d /usr/src/kernels/* /usr/src/linux-* \
2>/dev/null | grep -v obj | sort -Vr | head -1)
build="$src"
fi
])
AS_IF([test -n "$src" && test -e "$src"], [
kernelsrc=$(readlink -e "$src")
], [
kernelsrc="[Not found]"
])
AS_IF([test -n "$build" && test -e "$build"], [
kernelbuild=$(readlink -e "$build")
], [
kernelbuild="[Not found]"
])
], [
AS_IF([test "$kernelsrc" = "NONE"], [
kernsrcver=NONE
])
withlinux=yes
])
AC_MSG_RESULT([done])
AC_MSG_CHECKING([kernel source directory])
AC_MSG_RESULT([$kernelsrc])
AC_MSG_CHECKING([kernel build directory])
AC_MSG_RESULT([$kernelbuild])
AS_IF([test ! -d "$kernelsrc" || test ! -d "$kernelbuild"], [
AC_MSG_ERROR([
*** Please make sure the kernel devel package for your distribution
*** is installed and then try again. If that fails, you can specify the
*** location of the kernel source and build with the '--with-linux=PATH' and
*** '--with-linux-obj=PATH' options respectively.])
])
AC_MSG_CHECKING([kernel source version])
utsrelease1=$kernelbuild/include/linux/version.h
utsrelease2=$kernelbuild/include/linux/utsrelease.h
utsrelease3=$kernelbuild/include/generated/utsrelease.h
AS_IF([test -r $utsrelease1 && grep -qF UTS_RELEASE $utsrelease1], [
utsrelease=$utsrelease1
], [test -r $utsrelease2 && grep -qF UTS_RELEASE $utsrelease2], [
utsrelease=$utsrelease2
], [test -r $utsrelease3 && grep -qF UTS_RELEASE $utsrelease3], [
utsrelease=$utsrelease3
])
AS_IF([test -n "$utsrelease"], [
kernsrcver=$($AWK '/UTS_RELEASE/ { gsub(/"/, "", $[3]); print $[3] }' $utsrelease)
AS_IF([test -z "$kernsrcver"], [
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([
*** Cannot determine kernel version.
])
])
], [
AC_MSG_RESULT([Not found])
if test "x$enable_linux_builtin" != xyes; then
AC_MSG_ERROR([
*** Cannot find UTS_RELEASE definition.
])
else
AC_MSG_ERROR([
*** Cannot find UTS_RELEASE definition.
*** Please run 'make prepare' inside the kernel source tree.])
fi
])
AC_MSG_RESULT([$kernsrcver])
AS_VERSION_COMPARE([$kernsrcver], [$ZFS_META_KVER_MIN], [
AC_MSG_ERROR([
*** Cannot build against kernel version $kernsrcver.
*** The minimum supported kernel version is $ZFS_META_KVER_MIN.
])
])
LINUX=${kernelsrc}
LINUX_OBJ=${kernelbuild}
LINUX_VERSION=${kernsrcver}
AC_SUBST(LINUX)
AC_SUBST(LINUX_OBJ)
AC_SUBST(LINUX_VERSION)
])
dnl #
dnl # Detect the QAT module to be built against, QAT provides hardware
dnl # acceleration for data compression:
dnl #
dnl # https://01.org/intel-quickassist-technology
dnl #
dnl # 1) Download and install QAT driver from the above link
dnl # 2) Start QAT driver in your system:
dnl # service qat_service start
dnl # 3) Enable QAT in ZFS, e.g.:
dnl # ./configure --with-qat=<qat-driver-path>/QAT1.6
dnl # make
dnl # 4) Set GZIP compression in ZFS dataset:
dnl # zfs set compression = gzip <dataset>
dnl #
dnl # Then the data written to this ZFS pool is compressed by QAT accelerator
dnl # automatically, and de-compressed by QAT when read from the pool.
dnl #
dnl # 1) Get QAT hardware statistics with:
dnl # cat /proc/icp_dh895xcc_dev/qat
dnl # 2) To disable QAT:
dnl # insmod zfs.ko zfs_qat_disable=1
dnl #
AC_DEFUN([ZFS_AC_QAT], [
AC_ARG_WITH([qat],
AS_HELP_STRING([--with-qat=PATH],
[Path to qat source]),
AS_IF([test "$withval" = "yes"],
AC_MSG_ERROR([--with-qat=PATH requires a PATH]),
[qatsrc="$withval"]))
AC_ARG_WITH([qat-obj],
AS_HELP_STRING([--with-qat-obj=PATH],
[Path to qat build objects]),
[qatbuild="$withval"])
AS_IF([test ! -z "${qatsrc}"], [
AC_MSG_CHECKING([qat source directory])
AC_MSG_RESULT([$qatsrc])
QAT_SRC="${qatsrc}/quickassist"
AS_IF([ test ! -e "$QAT_SRC/include/cpa.h"], [
AC_MSG_ERROR([
*** Please make sure the qat driver package is installed
*** and specify the location of the qat source with the
*** '--with-qat=PATH' option then try again. Failed to
*** find cpa.h in:
${QAT_SRC}/include])
])
])
AS_IF([test ! -z "${qatsrc}"], [
AC_MSG_CHECKING([qat build directory])
AS_IF([test -z "$qatbuild"], [
qatbuild="${qatsrc}/build"
])
AC_MSG_RESULT([$qatbuild])
QAT_OBJ=${qatbuild}
AS_IF([ ! test -e "$QAT_OBJ/icp_qa_al.ko" && ! test -e "$QAT_OBJ/qat_api.ko"], [
AC_MSG_ERROR([
*** Please make sure the qat driver is installed then try again.
*** Failed to find icp_qa_al.ko or qat_api.ko in:
$QAT_OBJ])
])
AC_SUBST(QAT_SRC)
AC_SUBST(QAT_OBJ)
AC_DEFINE(HAVE_QAT, 1,
[qat is enabled and existed])
])
dnl #
dnl # Detect the name used for the QAT Module.symvers file.
dnl #
AS_IF([test ! -z "${qatsrc}"], [
AC_MSG_CHECKING([qat file for module symbols])
QAT_SYMBOLS=$QAT_SRC/lookaside/access_layer/src/Module.symvers
AS_IF([test -r $QAT_SYMBOLS], [
AC_MSG_RESULT([$QAT_SYMBOLS])
AC_SUBST(QAT_SYMBOLS)
],[
AC_MSG_ERROR([
*** Please make sure the qat driver is installed then try again.
*** Failed to find Module.symvers in:
$QAT_SYMBOLS
])
])
])
])
dnl #
dnl # ZFS_LINUX_CONFTEST_H
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
test -d build/$2 || mkdir -p build/$2
cat - <<_ACEOF >build/$2/$2.h
$1
_ACEOF
])
dnl #
dnl # ZFS_LINUX_CONFTEST_C
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
test -d build/$2 || mkdir -p build/$2
cat confdefs.h - <<_ACEOF >build/$2/$2.c
$1
_ACEOF
])
dnl #
dnl # ZFS_LINUX_CONFTEST_MAKEFILE
dnl #
dnl # $1 - test case name
dnl # $2 - add to top-level Makefile
dnl # $3 - additional build flags
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST_MAKEFILE], [
test -d build || mkdir -p build
test -d build/$1 || mkdir -p build/$1
file=build/$1/Makefile
dnl # Example command line to manually build source.
cat - <<_ACEOF >$file
# Example command line to manually build source
# make modules -C $LINUX_OBJ $ARCH_UM M=$PWD/build/$1
ccflags-y := -Werror $FRAME_LARGER_THAN
_ACEOF
dnl # Additional custom CFLAGS as requested.
m4_ifval($3, [echo "ccflags-y += $3" >>$file], [])
dnl # Test case source
echo "obj-m := $1.o" >>$file
AS_IF([test "x$2" = "xyes"], [echo "obj-m += $1/" >>build/Makefile], [])
])
dnl #
dnl # ZFS_LINUX_TEST_PROGRAM(C)([PROLOGUE], [BODY])
dnl #
m4_define([ZFS_LINUX_TEST_PROGRAM], [
#include <linux/module.h>
$1
int
main (void)
{
$2
;
return 0;
}
MODULE_DESCRIPTION("conftest");
MODULE_AUTHOR(ZFS_META_AUTHOR);
MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE);
MODULE_LICENSE($3);
])
dnl #
dnl # ZFS_LINUX_TEST_REMOVE
dnl #
dnl # Removes the specified test source and results.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_REMOVE], [
test -d build/$1 && rm -Rf build/$1
test -f build/Makefile && sed '/$1/d' build/Makefile
])
dnl #
dnl # ZFS_LINUX_COMPILE
dnl #
dnl # $1 - build dir
dnl # $2 - test command
dnl # $3 - pass command
dnl # $4 - fail command
dnl # $5 - set KBUILD_MODPOST_NOFINAL='yes'
dnl # $6 - set KBUILD_MODPOST_WARN='yes'
dnl #
dnl # Used internally by ZFS_LINUX_TEST_{COMPILE,MODPOST}
dnl #
AC_DEFUN([ZFS_LINUX_COMPILE], [
AC_ARG_VAR([KERNEL_CC], [C compiler for
building kernel modules])
AC_ARG_VAR([KERNEL_LD], [Linker for
building kernel modules])
AC_ARG_VAR([KERNEL_LLVM], [Binary option to
build kernel modules with LLVM/CLANG toolchain])
AC_TRY_COMMAND([
KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
-C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
])
dnl #
dnl # ZFS_LINUX_TEST_COMPILE
dnl #
dnl # Perform a full compile excluding the final modpost phase.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_COMPILE], [
ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
mv $2/Makefile $2/Makefile.compile.$1
mv $2/build.log $2/build.log.$1
],[
AC_MSG_ERROR([
*** Unable to compile test source to determine kernel interfaces.])
], [yes], [])
])
dnl #
dnl # ZFS_LINUX_TEST_MODPOST
dnl #
dnl # Perform a full compile including the modpost phase. This may
dnl # be an incremental build if the objects have already been built.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_MODPOST], [
ZFS_LINUX_COMPILE([$2], [test -f $2/build.log], [
mv $2/Makefile $2/Makefile.modpost.$1
cat $2/build.log >>build/build.log.$1
],[
AC_MSG_ERROR([
*** Unable to modpost test source to determine kernel interfaces.])
], [], [yes])
])
dnl #
dnl # Perform the compilation of the test cases in two phases.
dnl #
dnl # Phase 1) attempt to build the object files for all of the tests
dnl # defined by the ZFS_LINUX_TEST_SRC macro. But do not
dnl # perform the final modpost stage.
dnl #
dnl # Phase 2) disable all tests which failed the initial compilation,
dnl # then invoke the final modpost step for the remaining tests.
dnl #
dnl # This allows us efficiently build the test cases in parallel while
dnl # remaining resilient to build failures which are expected when
dnl # detecting the available kernel interfaces.
dnl #
dnl # The maximum allowed parallelism can be controlled by setting the
dnl # TEST_JOBS environment variable. Otherwise, it default to $(nproc).
dnl #
AC_DEFUN([ZFS_LINUX_TEST_COMPILE_ALL], [
dnl # Phase 1 - Compilation only, final linking is skipped.
ZFS_LINUX_TEST_COMPILE([$1], [build])
dnl #
dnl # Phase 2 - When building external modules disable test cases
dnl # which failed to compile and invoke modpost to verify the
dnl # final linking.
dnl #
dnl # Test names suffixed with '_license' call modpost independently
dnl # to ensure that a single incompatibility does not result in the
dnl # modpost phase exiting early. This check is not performed on
dnl # every symbol since the majority are compatible and doing so
dnl # would significantly slow down this phase.
dnl #
dnl # When configuring for builtin (--enable-linux-builtin)
dnl # fake the linking step artificially create the expected .ko
dnl # files for tests which did compile. This is required for
dnl # kernels which do not have loadable module support or have
dnl # not yet been built.
dnl #
AS_IF([test "x$enable_linux_builtin" = "xno"], [
for dir in $(awk '/^obj-m/ { print [$]3 }' \
build/Makefile.compile.$1); do
name=${dir%/}
AS_IF([test -f build/$name/$name.o], [
AS_IF([test "${name##*_}" = "license"], [
ZFS_LINUX_TEST_MODPOST([$1],
[build/$name])
echo "obj-n += $dir" >>build/Makefile
], [
echo "obj-m += $dir" >>build/Makefile
])
], [
echo "obj-n += $dir" >>build/Makefile
])
done
ZFS_LINUX_TEST_MODPOST([$1], [build])
], [
for dir in $(awk '/^obj-m/ { print [$]3 }' \
build/Makefile.compile.$1); do
name=${dir%/}
AS_IF([test -f build/$name/$name.o], [
touch build/$name/$name.ko
])
done
])
])
dnl #
dnl # ZFS_LINUX_TEST_SRC
dnl #
dnl # $1 - name
dnl # $2 - global
dnl # $3 - source
dnl # $4 - extra cflags
dnl # $5 - check license-compatibility
dnl #
dnl # Check if the test source is buildable at all and then if it is
dnl # license compatible.
dnl #
dnl # N.B because all of the test cases are compiled in parallel they
dnl # must never depend on the results of previous tests. Each test
dnl # needs to be entirely independent.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_SRC], [
ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM([[$2]], [[$3]],
[["Dual BSD/GPL"]])], [$1])
ZFS_LINUX_CONFTEST_MAKEFILE([$1], [yes], [$4])
AS_IF([ test -n "$5" ], [
ZFS_LINUX_CONFTEST_C([ZFS_LINUX_TEST_PROGRAM(
[[$2]], [[$3]], [[$5]])], [$1_license])
ZFS_LINUX_CONFTEST_MAKEFILE([$1_license], [yes], [$4])
])
])
dnl #
dnl # ZFS_LINUX_TEST_RESULT
dnl #
dnl # $1 - name of a test source (ZFS_LINUX_TEST_SRC)
dnl # $2 - run on success (valid .ko generated)
dnl # $3 - run on failure (unable to compile)
dnl #
AC_DEFUN([ZFS_LINUX_TEST_RESULT], [
AS_IF([test -d build/$1], [
AS_IF([test -f build/$1/$1.ko], [$2], [$3])
], [
AC_MSG_ERROR([
*** No matching source for the "$1" test, check that
*** both the test source and result macros refer to the same name.
])
])
])
dnl #
dnl # ZFS_LINUX_TEST_ERROR
dnl #
dnl # Generic error message which can be used when none of the expected
dnl # kernel interfaces were detected.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_ERROR], [
AC_MSG_ERROR([
*** None of the expected "$1" interfaces were detected.
*** This may be because your kernel version is newer than what is
*** supported, or you are using a patched custom kernel with
*** incompatible modifications.
***
*** ZFS Version: $ZFS_META_ALIAS
*** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
])
])
dnl #
dnl # ZFS_LINUX_TEST_RESULT_SYMBOL
dnl #
dnl # Like ZFS_LINUX_TEST_RESULT except ZFS_CHECK_SYMBOL_EXPORT is called to
dnl # verify symbol exports, unless --enable-linux-builtin was provided to
dnl # configure.
dnl #
AC_DEFUN([ZFS_LINUX_TEST_RESULT_SYMBOL], [
AS_IF([ ! test -f build/$1/$1.ko], [
$5
], [
AS_IF([test "x$enable_linux_builtin" != "xyes"], [
ZFS_CHECK_SYMBOL_EXPORT([$2], [$3], [$4], [$5])
], [
$4
])
])
])
dnl #
dnl # ZFS_LINUX_COMPILE_IFELSE
dnl #
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
ZFS_LINUX_TEST_REMOVE([conftest])
m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1], [conftest])])
m4_ifvaln([$5], [ZFS_LINUX_CONFTEST_H([$5], [conftest])],
[ZFS_LINUX_CONFTEST_H([], [conftest])])
ZFS_LINUX_CONFTEST_MAKEFILE([conftest], [no],
[m4_ifvaln([$5], [-I$PWD/build/conftest], [])])
ZFS_LINUX_COMPILE([build/conftest], [$2], [$3], [$4], [], [])
])
dnl #
dnl # ZFS_LINUX_TRY_COMPILE
dnl #
dnl # $1 - global
dnl # $2 - source
dnl # $3 - run on success (valid .ko generated)
dnl # $4 - run on failure (unable to compile)
dnl #
dnl # When configuring as builtin (--enable-linux-builtin) for kernels
dnl # without loadable module support (CONFIG_MODULES=n) only the object
dnl # file is created. See ZFS_LINUX_TEST_COMPILE_ALL for details.
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE], [
AS_IF([test "x$enable_linux_builtin" = "xyes"], [
ZFS_LINUX_COMPILE_IFELSE(
[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
[[ZFS_META_LICENSE]])],
[test -f build/conftest/conftest.o], [$3], [$4])
], [
ZFS_LINUX_COMPILE_IFELSE(
[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
[[ZFS_META_LICENSE]])],
[test -f build/conftest/conftest.ko], [$3], [$4])
])
])
dnl #
dnl # ZFS_CHECK_SYMBOL_EXPORT
dnl #
dnl # Check if a symbol is exported on not by consulting the symbols
dnl # file, or optionally the source code.
dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
rc=$?
if test $rc -ne 0; then
export=0
for file in $2; do
grep -q -E "EXPORT_SYMBOL.*($1)" \
"$LINUX/$file" 2>/dev/null
rc=$?
if test $rc -eq 0; then
export=1
break;
fi
done
if test $export -eq 0; then :
$4
else :
$3
fi
else :
$3
fi
])
dnl #
dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
dnl #
dnl # Like ZFS_LINUX_TRY_COMPILER except ZFS_CHECK_SYMBOL_EXPORT is called
dnl # to verify symbol exports, unless --enable-linux-builtin was provided
dnl # to configure.
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
if test $rc -ne 0; then :
$6
else
if test "x$enable_linux_builtin" != xyes; then
ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
fi
if test $rc -ne 0; then :
$6
else :
$5
fi
fi
])
dnl #
dnl # ZFS_LINUX_TRY_COMPILE_HEADER
dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
dnl # provided via the fifth parameter
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER], [
AS_IF([test "x$enable_linux_builtin" = "xyes"], [
ZFS_LINUX_COMPILE_IFELSE(
[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
[[ZFS_META_LICENSE]])],
[test -f build/conftest/conftest.o], [$3], [$4], [$5])
], [
ZFS_LINUX_COMPILE_IFELSE(
[ZFS_LINUX_TEST_PROGRAM([[$1]], [[$2]],
[[ZFS_META_LICENSE]])],
[test -f build/conftest/conftest.ko], [$3], [$4], [$5])
])
])
dnl #
dnl # AS_VERSION_COMPARE_LE
dnl # like AS_VERSION_COMPARE_LE, but runs $3 if (and only if) $1 <= $2
dnl # AS_VERSION_COMPARE_LE (version-1, version-2, [action-if-less-or-equal], [action-if-greater])
dnl #
AC_DEFUN([AS_VERSION_COMPARE_LE], [
AS_VERSION_COMPARE([$1], [$2], [$3], [$3], [$4])
])
dnl #
dnl # ZFS_LINUX_REQUIRE_API
dnl # like ZFS_LINUX_TEST_ERROR, except only fails if the kernel is
dnl # at least some specified version.
dnl #
AC_DEFUN([ZFS_LINUX_REQUIRE_API], [
AS_VERSION_COMPARE_LE([$2], [$kernsrcver], [
AC_MSG_ERROR([
*** None of the expected "$1" interfaces were detected. This
*** interface is expected for kernels version "$2" and above.
*** This may be because your kernel version is newer than what is
*** supported, or you are using a patched custom kernel with
*** incompatible modifications. Newer kernels may have incompatible
*** APIs.
***
*** ZFS Version: $ZFS_META_ALIAS
*** Compatible Kernels: $ZFS_META_KVER_MIN - $ZFS_META_KVER_MAX
])
], [
AC_MSG_RESULT(no)
])
])
Reference in New Issue View Git Blame Copy Permalink