[PATCHSET RFC 0/437] Kill off old fops ->read() and ->write()

* [PATCHSET RFC 0/437] Kill off old fops ->read() and ->write()
@ 2024-04-11 15:12 Jens Axboe
  2024-04-11 15:12 ` [PATCH 001/437] fs: split do_loop_readv_writev() into separate read/write side helpers Jens Axboe
                   ` (437 more replies)
  0 siblings, 438 replies; 451+ messages in thread
From: Jens Axboe @ 2024-04-11 15:12 UTC (permalink / raw)
  To: linux-kernel

Hi,

This patchset will obviously be split, commit messages updated, and
specific driver patches targeted to where they belong. But I figured
it'd be useful to blast out the full set at least once for reference,
and then I'll continue down the right path for the next one.

Subject line says it all, really. 10 years ago we added ->read_iter()
and ->write_iter() to struct file_operations. These are great, as they
pass in an iov_iter rather than a user buffer + length, and they also
take a struct kiocb rather than just a file. Since then we've had two
paths for any read or write - one legacy one that can't do per-IO hints
like "This read should be non-blocking", they strictly only work with
O_NONBLOCK on the file, and a newer one that supports everything the
old path does and a bunch more. We've had a few issues with the
iov_iter based path being slower, but those have basically been
resolved with solutions like ITER_UBUF to optimize the single segment
case that is often the fast path.

There are basically three parts to this series:

1) Add generic helpers that we need to convert drivers.
2) Convert any use of fops->read() and ->write()
3) Kill off old cruft.
3a) Profit.

Notes:

- Part 1 adds FOPS_READ_ITER_HELPER() and FOPS_WRITE_ITER_HELPER() to
  ease conversion of some drivers, as those just wrap the existing
  read or write function with vfs_{read,write}_iter(). Where possible
  this has been avoided and a clean implementation been done. However,
  due to lack of man power, I didn't dig super deep in some spots. It's
  my hope that drivers with active developers/maintainers will take it
  a step further and help get their driver fully converted.

- This is based on my 'read_iter' branch that adds one helper and
  converts timerfd/userfaultfd/signalfd. This branch is queued for
  6.10.

- I'm sure there are a few spots that I haven't converted just yet
  because I've missed them. If you see any, please let me know and
  I'll take care of it.

- The kernel builds allyesconfig/allmodconfig on (at least) the
  following architectures: x86-64, arm64, sparc64, s390, powerpc.
  With the above caveat that there may still be old crufty drivers
  somewhere in the tree that are missing a conversion, it should be
  fairly complete.

- Resulting kernel boots just fine, tested on x86-64 and arm64.
  Caveat emptor if you want to test it, however!

- As you may be able to tell, diffstat looks promising. The lines
  removed will continue to go up with removal of FOPS_*() wrappers.
  There are currently about 150 read side wrappers and 200 write side
  wrappers.

- I haven't done detailed analysis of text/bss sizes just yet, but
  preliminary looks show about a 100K reduction in kernel image size
  for my standard test box build.

Please have a look! A continually rebased branch for these patches can
be found here:

https://git.kernel.dk/cgit/linux/log/?h=rw_iter

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 fs/pstore/inode.c                             |  13 +-
 fs/pstore/pmsg.c                              |   3 +-
 fs/qnx4/dir.c                                 |   2 +-
 fs/qnx6/dir.c                                 |   2 +-
 fs/read_write.c                               |  74 ++-
 fs/reiserfs/dir.c                             |   2 +-
 fs/romfs/super.c                              |   2 +-
 fs/smb/client/cifsfs.c                        |   2 +-
 fs/squashfs/dir.c                             |   2 +-
 fs/sysv/dir.c                                 |   2 +-
 fs/tracefs/event_inode.c                      |   2 +-
 fs/tracefs/inode.c                            |  12 +-
 fs/ubifs/debug.c                              |  57 +-
 fs/ubifs/dir.c                                |   2 +-
 fs/udf/dir.c                                  |   2 +-
 fs/ufs/dir.c                                  |   2 +-
 fs/vboxsf/dir.c                               |   2 +-
 fs/xfs/scrub/stats.c                          |  27 +-
 fs/xfs/xfs_file.c                             |   2 +-
 fs/zonefs/super.c                             |   2 +-
 include/drm/drm_accel.h                       |   2 +-
 include/drm/drm_file.h                        |   3 +-
 include/drm/drm_gem.h                         |   2 +-
 include/drm/drm_gem_dma_helper.h              |   2 +-
 include/linux/debugfs.h                       |  55 +-
 include/linux/fs.h                            |  48 +-
 include/linux/ftrace.h                        |  11 +-
 include/linux/kstrtox.h                       |  33 +-
 include/linux/nsc_gpio.h                      |   8 +-
 include/linux/seq_file.h                      |   8 +-
 include/linux/string.h                        |   4 +
 include/linux/string_helpers.h                |   3 +-
 include/linux/uio.h                           |   3 +
 include/linux/user_namespace.h                |  10 +-
 include/misc/cxl.h                            |   3 +-
 include/net/cfg80211.h                        |  24 +-
 io_uring/rw.c                                 |  70 ---
 ipc/mqueue.c                                  |  10 +-
 kernel/bpf/bpf_iter.c                         |  14 +-
 kernel/bpf/inode.c                            |   2 +-
 kernel/bpf/syscall.c                          |  18 +-
 kernel/dma/debug.c                            |  15 +-
 kernel/events/core.c                          |   3 +-
 kernel/fail_function.c                        |  10 +-
 kernel/gcov/fs.c                              |  23 +-
 kernel/irq/debugfs.c                          |  12 +-
 kernel/kcsan/debugfs.c                        |  10 +-
 kernel/kprobes.c                              |  15 +-
 kernel/locking/lock_events.c                  |  18 +-
 kernel/locking/lock_events.h                  |   4 +-
 kernel/locking/qspinlock_stat.h               |   7 +-
 kernel/module/stats.c                         |   8 +-
 kernel/module/tracking.c                      |   2 +-
 kernel/power/qos.c                            |  21 +-
 kernel/power/user.c                           |  28 +-
 kernel/printk/printk.c                        |  12 +-
 kernel/relay.c                                |  20 +-
 kernel/sched/debug.c                          |  53 +-
 kernel/time/posix-clock.c                     |   3 +-
 kernel/time/test_udelay.c                     |  10 +-
 kernel/trace/blktrace.c                       |  19 +-
 kernel/trace/ftrace.c                         |  68 ++-
 kernel/trace/rv/rv.c                          |  58 +-
 kernel/trace/rv/rv_reactors.c                 |  32 +-
 kernel/trace/trace.c                          | 386 ++++++--------
 kernel/trace/trace_dynevent.c                 |   5 +-
 kernel/trace/trace_events.c                   | 116 ++--
 kernel/trace/trace_events_hist.c              |   4 +-
 kernel/trace/trace_events_inject.c            |  19 +-
 kernel/trace/trace_events_synth.c             |   5 +-
 kernel/trace/trace_events_trigger.c           |  22 +-
 kernel/trace/trace_events_user.c              |  17 +-
 kernel/trace/trace_functions_graph.c          |  20 +-
 kernel/trace/trace_hwlat.c                    |  20 +-
 kernel/trace/trace_kprobe.c                   |   7 +-
 kernel/trace/trace_osnoise.c                  |  42 +-
 kernel/trace/trace_printk.c                   |   2 +-
 kernel/trace/trace_recursion_record.c         |  10 +-
 kernel/trace/trace_sched_switch.c             |  21 +-
 kernel/trace/trace_stack.c                    |  27 +-
 kernel/trace/trace_stat.c                     |   2 +-
 kernel/trace/trace_uprobe.c                   |   7 +-
 kernel/user_namespace.c                       |  39 +-
 lib/dynamic_debug.c                           |   5 +-
 lib/kstrtox.c                                 |  46 +-
 lib/kunit/debugfs.c                           |  13 +-
 lib/string_helpers.c                          |  14 +-
 lib/test_firmware.c                           |  10 +-
 lib/xz/xz_dec_test.c                          |   9 +-
 mm/damon/dbgfs.c                              |  84 +--
 mm/huge_memory.c                              |  10 +-
 mm/kmemleak.c                                 |   5 +-
 mm/page_owner.c                               |   5 +-
 mm/shrinker_debug.c                           |  12 +-
 mm/slub.c                                     |   2 +-
 mm/util.c                                     |  57 ++
 mm/vmscan.c                                   |  14 +-
 net/6lowpan/debugfs.c                         |  14 +-
 net/bluetooth/6lowpan.c                       |  12 +-
 net/bluetooth/hci_debugfs.c                   | 150 +++---
 net/bluetooth/selftest.c                      |   9 +-
 net/bluetooth/smp.c                           |   9 +-
 net/core/datagram.c                           |  10 +-
 net/l2tp/l2tp_debugfs.c                       |   2 +-
 net/mac80211/debugfs.c                        | 185 +++----
 net/mac80211/debugfs.h                        |   4 +-
 net/mac80211/debugfs_key.c                    |  81 ++-
 net/mac80211/debugfs_netdev.c                 | 126 ++---
 net/mac80211/debugfs_sta.c                    | 146 +++--
 net/mac80211/rate.c                           |  10 +-
 net/mac80211/rc80211_minstrel_ht_debugfs.c    |  11 +-
 net/rfkill/core.c                             |  22 +-
 net/sunrpc/cache.c                            |  14 +-
 net/sunrpc/debugfs.c                          |   4 +-
 net/sunrpc/rpc_pipe.c                         |   8 +-
 net/wireless/debugfs.c                        |  57 +-
 samples/vfio-mdev/mtty.c                      |  30 +-
 security/apparmor/apparmorfs.c                |  55 +-
 security/inode.c                              |   9 +-
 security/integrity/evm/evm_secfs.c            |  60 +--
 security/integrity/ima/ima_fs.c               |  41 +-
 security/landlock/syscalls.c                  |  15 +-
 security/lockdown/lockdown.c                  |  10 +-
 security/safesetid/securityfs.c               |  14 +-
 security/selinux/selinuxfs.c                  | 168 +++---
 security/smack/smackfs.c                      | 281 +++++-----
 security/tomoyo/securityfs_if.c               |  21 +-
 sound/core/compress_offload.c                 |   7 +-
 sound/core/control.c                          |  14 +-
 sound/core/hwdep.c                            |   6 +-
 sound/core/init.c                             |  10 +-
 sound/core/jack.c                             |  83 ++-
 sound/core/oss/pcm_oss.c                      |   6 +-
 sound/core/pcm_native.c                       |  22 +-
 sound/core/rawmidi.c                          |   6 +-
 sound/core/seq/oss/seq_oss.c                  |  11 +-
 sound/core/seq/seq_clientmgr.c                |   8 +-
 sound/core/timer.c                            |  23 +-
 sound/drivers/pcmtest.c                       |  36 +-
 sound/oss/dmasound/dmasound_core.c            |   8 +-
 sound/soc/fsl/imx-audmux.c                    |  11 +-
 sound/soc/intel/avs/debugfs.c                 |  69 +--
 sound/soc/intel/avs/pcm.c                     |   9 +-
 sound/soc/intel/skylake/skl-debug.c           |  19 +-
 sound/soc/soc-dapm.c                          |  21 +-
 sound/soc/soc-pcm.c                           |  10 +-
 sound/soc/sof/debug.c                         |  34 +-
 sound/soc/sof/ipc3-dtrace.c                   |  17 +-
 sound/soc/sof/ipc4-mtrace.c                   |  17 +-
 sound/soc/sof/ipc4-telemetry.c                |  14 +-
 sound/soc/sof/sof-client-ipc-flood-test.c     |  19 +-
 .../soc/sof/sof-client-ipc-kernel-injector.c  |  15 +-
 sound/soc/sof/sof-client-ipc-msg-injector.c   |  67 ++-
 sound/soc/sof/sof-client-probes.c             |  31 +-
 virt/kvm/kvm_main.c                           |  10 +-
 859 files changed, 11379 insertions(+), 12492 deletions(-)

-- 
Jens Axboe

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