zfs/lib/libspl
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
..
asm-generic Fix atomic_clear_long_excl wrong return 2020-07-06 11:46:17 -07:00
asm-i386 Changes to make openzfs build within FreeBSD buildworld 2020-07-31 21:30:31 -07:00
asm-x86_64 Fixes for make dist 2020-06-26 14:20:02 -07:00
include Linux 5.10 compat: use iov_iter in uio structure 2020-12-18 08:48:26 -08:00
os FreeBSD: Improve libzfs_error_init messages 2020-10-13 09:38:40 -07:00
Makefile.am libspl: Provide platform-specific zone implementations 2020-08-31 19:43:30 -07:00
assert.c Move libspl_assertf into .c file 2020-07-10 14:25:24 -07:00
list.c Fixing gang ABD child removal race condition 2020-07-14 11:04:35 -07:00
mkdirp.c Fix typos in lib/ 2019-09-02 17:53:27 -07:00
page.c ABD optimized page allocation code 2016-11-29 14:34:33 -08:00
strlcat.c Check for strlcat and strlcpy 2018-12-11 16:01:41 -08:00
strlcpy.c Check for strlcat and strlcpy 2018-12-11 16:01:41 -08:00
timestamp.c Always use "%lld" for formatting time_ts 2020-05-28 10:29:58 -07:00