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Brian Behlendorf 1c2358c12a
Linux 5.10 compat: use iov_iter in uio structure 
As of the 5.10 kernel the generic splice compatibility code has been
removed.  All filesystems are now responsible for registering a
->splice_read and ->splice_write callback to support this operation.

The good news is the VFS provided generic_file_splice_read() and
iter_file_splice_write() callbacks can be used provided the ->iter_read
and ->iter_write callback support pipes.  However, this is currently
not the case and only iovecs and bvecs (not pipes) are ever attached
to the uio structure.

This commit changes that by allowing full iov_iter structures to be
attached to uios.  Ever since the 4.9 kernel the iov_iter structure
has supported iovecs, kvecs, bvevs, and pipes so it's desirable to
pass the entire thing when possible.  In conjunction with this the
uio helper functions (i.e uiomove(), uiocopy(), etc) have been
updated to understand the new UIO_ITER type.

Note that using the kernel provided uio_iter interfaces allowed the
existing Linux specific uio handling code to be simplified.  When
there's no longer a need to support kernel's older than 4.9, then
it will be possible to remove the iovec and bvec members from the
uio structure and always use a uio_iter.  Until then we need to
maintain all of the existing types for older kernels.

Some additional refactoring and cleanup was included in this change:

- Added checks to configure to detect available iov_iter interfaces.
  Some are available all the way back to the 3.10 kernel and are used
  when available.  In particular, uio_prefaultpages() now always uses
  iov_iter_fault_in_readable() which is available for all supported
  kernels.

- The unused UIO_USERISPACE type has been removed.  It is no longer
  needed now that the uio_seg enum is platform specific.

- Moved zfs_uio.c from the zcommon.ko module to the Linux specific
  platform code for the zfs.ko module.  This gets it out of libzfs
  where it was never needed and keeps this Linux specific code out
  of the common sources.

- Removed unnecessary O_APPEND handling from zfs_iter_write(), this
  is redundant and O_APPEND is already handled in zfs_write();

Reviewed-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #11351
 		2020-12-18 08:48:26 -08:00
..
.gitignore Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
Abigail.am Library ABI tracking with abigail 2020-11-17 09:18:52 -08:00
Rules.am Prefix zfs internal endian checks with _ZFS 2020-07-28 13:02:49 -07:00
Substfiles.am Centralize variable substitution 2020-07-14 17:33:44 -07:00
always-arch.m4 Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
always-compiler-options.m4 Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
always-python.m4 Centralize variable substitution 2020-07-14 17:33:44 -07:00
always-pyzfs.m4 Python config cleanup 2019-06-13 13:15:46 -07:00
always-sed.m4 Add compatibility for busybox mktemp 2020-12-03 10:01:16 -08:00
always-system.m4 OpenZFS restructuring - move platform specific headers 2019-09-05 09:34:54 -07:00
ax_code_coverage.m4 Import ZStandard v1.4.5 2020-08-20 10:30:06 -07:00
ax_python_devel.m4 Adopt pyzfs from ClusterHQ 2018-05-01 10:33:35 -07:00
ax_restore_flags.m4 config: better libtirpc detection 2019-03-02 16:19:05 -08:00
ax_save_flags.m4 config: better libtirpc detection 2019-03-02 16:19:05 -08:00
config.awk Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
config.rpath Add config.rpath for AM_GNU_GETTEXT 2020-07-10 14:26:12 -07:00
deb.am Add compatibility for busybox mktemp 2020-12-03 10:01:16 -08:00
find_system_library.m4 Spruce up pkg-config files for libzfs/libzfs_core 2020-09-04 11:11:18 -07:00
gettext.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
host-cpu-c-abi.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
iconv.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
intlmacosx.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
kernel-access-ok-type.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-acl.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-aio-fsync.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-automount.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-bdi.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-bio.m4 blkg_tryget config test: initialize struct 2020-10-13 16:36:36 -07:00
kernel-blk-queue.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-blkdev.m4 Linux 5.10 compat: check_disk_change() removed 2020-11-02 22:01:19 +00:00
kernel-block-device-operations.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-clear-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-commit-metadata.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-config-defined.m4 Fix CONFIG_DEBUG_LOCK_ALLOC configure check 2020-09-28 16:42:54 -07:00
kernel-current-time.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-declare-event-class.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-dentry-operations.m4 Partially revert 5a6ac4c 2019-11-18 13:05:56 -08:00
kernel-dirty-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-discard-granularity.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-encode-fh-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-evict-inode.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-fallocate.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-file-dentry.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-file-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-fmode-t.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-follow-down-one.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-fpu.m4 Linux 4.14, 4.19, 5.0+ compat: SIMD save/restore 2019-10-24 10:17:33 -07:00
kernel-fst-mount.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-fsync.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-generic_io_acct.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-generic_readlink.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-get-disk-and-module.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-get-disk-ro.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-get-link.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-global_page_state.m4 Linux 5.9 compat: NR_SLAB_RECLAIMABLE 2020-08-29 20:57:45 -07:00
kernel-group-info.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-hotplug.m4 Implement memory and CPU hotplug 2020-12-10 14:09:23 -08:00
kernel-in-compat-syscall.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-create.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-inode-getattr.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-lock.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-lookup.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-inode-set-flags.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-set-iversion.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-times.m4 config/kernel-inode-times: initialize timespec 2020-05-04 15:25:48 -07:00
kernel-insert-inode-locked.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-is_owner_or_cap.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kmap-atomic-args.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kmem-cache.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kmem.m4 Linux 5.8 compat: __vmalloc() 2020-06-08 16:32:02 -07:00
kernel-kstrtoul.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-ktime.m4 Linux 5.6 compat: ktime_get_raw_ts64() 2020-02-27 09:30:45 -08:00
kernel-kuid-helpers.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kuidgid.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-lseek-execute.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-make-request-fn.m4 Linux 5.9 compat: make_request_fn replaced with submit_bio interface 2020-08-11 13:37:33 -07:00
kernel-misc-minor.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-mkdir-umode-t.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-mod-param.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-objtool.m4 Linux 5.10 compat: frame.h renamed objtool.h 2020-11-02 22:01:10 +00:00
kernel-pde-data.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-percpu.m4 Linux 5.10 compat: percpu_ref added data member 2020-11-02 22:01:19 +00:00
kernel-proc-operations.m4 Linux 5.6 compat: struct proc_ops 2020-02-07 11:03:53 -08:00
kernel-put-link.m4 Fix typos 2020-06-09 21:24:09 -07:00
kernel-rename.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-revalidate-disk-size.m4 Linux 5.10 compat: revalidate_disk_size() added 2020-11-02 22:01:19 +00:00
kernel-rw.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-rwsem.m4 Delete rw_semaphore.wait_lock configure check 2020-12-09 21:22:54 -08:00
kernel-sched.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-security-inode-init.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-set-nlink.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-setattr-prepare.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-sget-args.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-show-options.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-shrink.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-super-userns.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-timer.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-tmpfile.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-totalhigh_pages.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-totalram-pages-func.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-truncate-setsize.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-userns-capabilities.m4 Linux 4.10 compat: has_capability() 2020-07-19 09:56:21 -07:00
kernel-usleep_range.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-vfs-direct_IO.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-vfs-fsync.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-vfs-getattr.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-vfs-iov_iter.m4 Linux 5.10 compat: use iov_iter in uio structure 2020-12-18 08:48:26 -08:00
kernel-vfs-iterate.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-vfs-rw-iterate.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-wait.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-xattr-handler.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-zlib.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel.m4 Linux 5.10 compat: use iov_iter in uio structure 2020-12-18 08:48:26 -08:00
lib-ld.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
lib-link.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
lib-prefix.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
mount-helper.m4 The mount helper mount.zfs MUST be in /sbin (not '$sbindir'). 2015-05-18 16:54:36 -07:00
nls.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
pkg.m4 Fix typos in config/ 2019-08-30 09:40:30 -07:00
po.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
progtest.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
rpm.am config/zfs-build.m4: never define _initramfs in RPM_DEFINE_UTIL 2020-09-12 08:22:07 -07:00
tgz.am Make RPM_DEFINE_KMOD conditional on CONFIG_KERNEL 2020-07-14 17:32:21 -07:00
toolchain-simd.m4 Add FreeBSD support to OpenZFS 2020-04-14 11:36:28 -07:00
user-clock_gettime.m4 Clean up lib dependencies 2020-07-10 14:26:00 -07:00
user-dracut.m4 Accept udev and dracut paths specified by ./configure 2014-06-11 16:32:57 -07:00
user-gettext.m4 Add config.rpath for AM_GNU_GETTEXT 2020-07-10 14:26:12 -07:00
user-libaio.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libblkid.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libcrypto.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libexec.m4 Tunable directory for zfs runtime scripts 2018-06-07 09:59:59 -07:00
user-libtirpc.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libudev.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libuuid.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-makedev.m4 glibc 2.5 compat: use correct header for makedev() et al. 2017-03-31 09:32:00 -07:00
user-pam.m4 Use correct prefix for share/pam-configs 2020-07-30 09:09:46 -07:00
user-runstatedir.m4 Add defs for makefile installation dir vars 2014-03-31 16:11:13 -07:00
user-systemd.m4 Fix systemd spec file macros 2018-11-11 18:06:36 -08:00
user-sysvinit.m4 Add systemd unit files for ZFS startup 2014-02-05 12:25:30 -08:00
user-udev.m4 Accept udev and dracut paths specified by ./configure 2014-06-11 16:32:57 -07:00
user-zlib.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user.m4 Clean up lib dependencies 2020-07-10 14:26:00 -07:00
zfs-build.m4 config/zfs-build.m4: never define _initramfs in RPM_DEFINE_UTIL 2020-09-12 08:22:07 -07:00
zfs-meta.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00