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Message-Id: <20220624165631.2124632-1-Jason@zx2c4.com>
Date:   Fri, 24 Jun 2022 18:56:25 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
        Jens Axboe <axboe@...nel.dk>, linux-fsdevel@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 0/6] cleanup llseek and splice

The goal of this patchset is to enable splicing to internal pipes for
select chardevs where it makes sense to do so. In the process, however,
it was revealed that many regular files are problematic here. The key
insight is that splicing to internal pipes is okay so long as the splice
operation is rewindable. That means these devices need to be llseekable.

So the series first tries to make llseek a bit tamer, fixing up the
long-standing tension between llseek==NULL vs llseek==no_llseek vs
~FMODE_LSEEK.

Along the way the series also fixes related bugs in ksmbd, dma-buf, and
vfio.

Finally, with FMODE_LSEEK as good information, the series is able to
adjust internal pipe splicing to use that.

Jason A. Donenfeld (6):
  ksmbd: use vfs_llseek instead of dereferencing NULL
  fs: do not set no_llseek in fops
  fs: clear FMODE_LSEEK if no llseek function
  fs: check FMODE_LSEEK to control internal pipe splicing
  dma-buf: remove useless FMODE_LSEEK flag
  vfio: do not set FMODE_LSEEK flag

 .../watchdog/convert_drivers_to_kernel_api.rst  |  1 -
 arch/parisc/kernel/perf.c                       |  1 -
 arch/powerpc/kernel/eeh.c                       |  4 ----
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c       |  1 -
 arch/powerpc/platforms/cell/spufs/file.c        | 17 -----------------
 arch/powerpc/platforms/powernv/eeh-powernv.c    |  1 -
 arch/powerpc/platforms/pseries/dtl.c            |  1 -
 arch/s390/hypfs/hypfs_dbfs.c                    |  1 -
 arch/s390/hypfs/inode.c                         |  1 -
 arch/s390/kernel/debug.c                        |  1 -
 arch/s390/kernel/perf_cpum_cf.c                 |  1 -
 arch/s390/kernel/sysinfo.c                      |  1 -
 arch/s390/pci/pci_clp.c                         |  1 -
 arch/um/drivers/harddog_kern.c                  |  1 -
 arch/um/drivers/hostaudio_kern.c                |  2 --
 arch/x86/kernel/cpu/mce/dev-mcelog.c            |  1 -
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c       |  1 -
 drivers/acpi/apei/erst-dbg.c                    |  1 -
 drivers/auxdisplay/charlcd.c                    |  1 -
 drivers/block/mtip32xx/mtip32xx.c               |  3 ---
 drivers/block/pktcdvd.c                         |  1 -
 drivers/bluetooth/hci_vhci.c                    |  1 -
 drivers/bus/moxtet.c                            |  2 --
 drivers/char/agp/frontend.c                     |  1 -
 drivers/char/applicom.c                         |  1 -
 drivers/char/ds1620.c                           |  1 -
 drivers/char/dtlk.c                             |  1 -
 drivers/char/hpet.c                             |  1 -
 drivers/char/ipmi/ipmi_watchdog.c               |  1 -
 drivers/char/pc8736x_gpio.c                     |  1 -
 drivers/char/pcmcia/cm4000_cs.c                 |  1 -
 drivers/char/pcmcia/cm4040_cs.c                 |  1 -
 drivers/char/pcmcia/scr24x_cs.c                 |  1 -
 drivers/char/ppdev.c                            |  1 -
 drivers/char/scx200_gpio.c                      |  1 -
 drivers/char/sonypi.c                           |  1 -
 drivers/char/tb0219.c                           |  1 -
 drivers/char/tpm/tpm-dev.c                      |  1 -
 drivers/char/tpm/tpm_vtpm_proxy.c               |  1 -
 drivers/char/tpm/tpmrm-dev.c                    |  1 -
 drivers/char/virtio_console.c                   |  1 -
 drivers/counter/counter-chrdev.c                |  1 -
 drivers/dma-buf/dma-buf.c                       |  1 -
 drivers/firewire/core-cdev.c                    |  1 -
 drivers/firmware/efi/capsule-loader.c           |  1 -
 drivers/firmware/efi/test/efi_test.c            |  1 -
 drivers/firmware/turris-mox-rwtm.c              |  1 -
 drivers/gnss/core.c                             |  1 -
 drivers/gpio/gpio-mockup.c                      |  1 -
 drivers/gpio/gpiolib-cdev.c                     |  1 -
 drivers/gpu/drm/drm_file.c                      |  1 -
 drivers/gpu/drm/i915/i915_perf.c                |  1 -
 drivers/gpu/drm/msm/msm_perf.c                  |  1 -
 drivers/gpu/drm/msm/msm_rd.c                    |  1 -
 drivers/hid/uhid.c                              |  1 -
 drivers/hwmon/asus_atk0110.c                    |  1 -
 drivers/hwmon/fschmd.c                          |  1 -
 drivers/hwmon/w83793.c                          |  1 -
 drivers/hwtracing/coresight/coresight-etb10.c   |  1 -
 .../hwtracing/coresight/coresight-tmc-core.c    |  1 -
 drivers/hwtracing/intel_th/msu.c                |  1 -
 drivers/hwtracing/stm/core.c                    |  1 -
 drivers/i2c/i2c-dev.c                           |  1 -
 drivers/infiniband/core/ucma.c                  |  1 -
 drivers/infiniband/core/user_mad.c              |  2 --
 drivers/infiniband/core/uverbs_main.c           |  4 ----
 drivers/infiniband/hw/hfi1/fault.c              |  1 -
 drivers/infiniband/hw/mlx5/devx.c               |  2 --
 drivers/input/evdev.c                           |  1 -
 drivers/input/joydev.c                          |  1 -
 drivers/input/keyboard/applespi.c               |  1 -
 drivers/input/misc/uinput.c                     |  1 -
 drivers/input/serio/userio.c                    |  1 -
 drivers/isdn/capi/capi.c                        |  1 -
 drivers/isdn/mISDN/timerdev.c                   |  1 -
 drivers/leds/uleds.c                            |  1 -
 drivers/macintosh/adb.c                         |  1 -
 drivers/macintosh/smu.c                         |  1 -
 drivers/media/cec/core/cec-api.c                |  1 -
 drivers/media/mc/mc-devnode.c                   |  1 -
 drivers/media/rc/lirc_dev.c                     |  1 -
 drivers/media/usb/uvc/uvc_debugfs.c             |  1 -
 drivers/media/v4l2-core/v4l2-dev.c              |  1 -
 drivers/message/fusion/mptctl.c                 |  1 -
 drivers/misc/lis3lv02d/lis3lv02d.c              |  1 -
 drivers/misc/mei/main.c                         |  1 -
 drivers/misc/phantom.c                          |  1 -
 drivers/mmc/core/block.c                        |  1 -
 drivers/mtd/ubi/cdev.c                          |  2 --
 drivers/mtd/ubi/debug.c                         |  1 -
 drivers/net/netdevsim/fib.c                     |  1 -
 drivers/net/tap.c                               |  1 -
 drivers/net/tun.c                               |  1 -
 .../wireless/broadcom/brcm80211/brcmfmac/core.c |  1 -
 drivers/net/wireless/intel/iwlwifi/mvm/d3.c     |  1 -
 drivers/pinctrl/pinmux.c                        |  1 -
 drivers/platform/chrome/cros_ec_debugfs.c       |  1 -
 drivers/platform/chrome/wilco_ec/debugfs.c      |  1 -
 drivers/platform/chrome/wilco_ec/event.c        |  1 -
 drivers/platform/chrome/wilco_ec/telemetry.c    |  1 -
 .../platform/surface/surface_aggregator_cdev.c  |  1 -
 drivers/platform/surface/surface_dtx.c          |  1 -
 drivers/pps/pps.c                               |  1 -
 drivers/rtc/dev.c                               |  1 -
 drivers/rtc/rtc-m41t80.c                        |  1 -
 drivers/s390/char/fs3270.c                      |  1 -
 drivers/s390/char/sclp_ctl.c                    |  1 -
 drivers/s390/char/tape_char.c                   |  1 -
 drivers/s390/char/uvdevice.c                    |  1 -
 drivers/s390/char/vmcp.c                        |  1 -
 drivers/s390/char/vmlogrdr.c                    |  1 -
 drivers/s390/char/zcore.c                       |  2 --
 drivers/s390/cio/chsc_sch.c                     |  1 -
 drivers/s390/cio/css.c                          |  1 -
 drivers/s390/crypto/pkey_api.c                  |  1 -
 drivers/s390/crypto/zcrypt_api.c                |  1 -
 drivers/sbus/char/openprom.c                    |  1 -
 drivers/sbus/char/uctrl.c                       |  1 -
 drivers/scsi/sg.c                               |  1 -
 drivers/spi/spidev.c                            |  1 -
 drivers/staging/pi433/pi433_if.c                |  1 -
 .../intel/int340x_thermal/acpi_thermal_rel.c    |  1 -
 drivers/tty/tty_io.c                            |  3 ---
 drivers/usb/gadget/function/f_fs.c              |  2 --
 drivers/usb/gadget/legacy/inode.c               |  2 --
 drivers/usb/gadget/legacy/raw_gadget.c          |  1 -
 drivers/usb/gadget/udc/atmel_usba_udc.c         |  1 -
 drivers/usb/misc/ftdi-elan.c                    |  1 -
 drivers/usb/misc/ldusb.c                        |  1 -
 drivers/usb/mon/mon_bin.c                       |  1 -
 drivers/usb/mon/mon_stat.c                      |  1 -
 drivers/usb/mon/mon_text.c                      |  2 --
 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c  |  2 --
 drivers/vfio/pci/mlx5/main.c                    |  2 --
 drivers/vfio/vfio.c                             |  2 +-
 drivers/watchdog/acquirewdt.c                   |  1 -
 drivers/watchdog/advantechwdt.c                 |  1 -
 drivers/watchdog/alim1535_wdt.c                 |  1 -
 drivers/watchdog/alim7101_wdt.c                 |  1 -
 drivers/watchdog/ar7_wdt.c                      |  1 -
 drivers/watchdog/at91rm9200_wdt.c               |  1 -
 drivers/watchdog/ath79_wdt.c                    |  1 -
 drivers/watchdog/cpu5wdt.c                      |  1 -
 drivers/watchdog/cpwd.c                         |  1 -
 drivers/watchdog/eurotechwdt.c                  |  1 -
 drivers/watchdog/gef_wdt.c                      |  1 -
 drivers/watchdog/geodewdt.c                     |  1 -
 drivers/watchdog/ib700wdt.c                     |  1 -
 drivers/watchdog/ibmasr.c                       |  1 -
 drivers/watchdog/indydog.c                      |  1 -
 drivers/watchdog/it8712f_wdt.c                  |  1 -
 drivers/watchdog/m54xx_wdt.c                    |  1 -
 drivers/watchdog/machzwd.c                      |  1 -
 drivers/watchdog/mixcomwd.c                     |  1 -
 drivers/watchdog/mtx-1_wdt.c                    |  1 -
 drivers/watchdog/nv_tco.c                       |  1 -
 drivers/watchdog/pc87413_wdt.c                  |  1 -
 drivers/watchdog/pcwd.c                         |  2 --
 drivers/watchdog/pcwd_pci.c                     |  2 --
 drivers/watchdog/pcwd_usb.c                     |  2 --
 drivers/watchdog/pika_wdt.c                     |  1 -
 drivers/watchdog/rc32434_wdt.c                  |  1 -
 drivers/watchdog/rdc321x_wdt.c                  |  1 -
 drivers/watchdog/riowd.c                        |  1 -
 drivers/watchdog/sa1100_wdt.c                   |  1 -
 drivers/watchdog/sb_wdog.c                      |  1 -
 drivers/watchdog/sbc60xxwdt.c                   |  1 -
 drivers/watchdog/sbc7240_wdt.c                  |  1 -
 drivers/watchdog/sbc8360.c                      |  1 -
 drivers/watchdog/sbc_epx_c3.c                   |  1 -
 drivers/watchdog/sbc_fitpc2_wdt.c               |  1 -
 drivers/watchdog/sc1200wdt.c                    |  1 -
 drivers/watchdog/sc520_wdt.c                    |  1 -
 drivers/watchdog/sch311x_wdt.c                  |  1 -
 drivers/watchdog/scx200_wdt.c                   |  1 -
 drivers/watchdog/smsc37b787_wdt.c               |  1 -
 drivers/watchdog/w83877f_wdt.c                  |  1 -
 drivers/watchdog/w83977f_wdt.c                  |  1 -
 drivers/watchdog/wafer5823wdt.c                 |  1 -
 drivers/watchdog/wdrtas.c                       |  2 --
 drivers/watchdog/wdt.c                          |  2 --
 drivers/watchdog/wdt285.c                       |  1 -
 drivers/watchdog/wdt977.c                       |  1 -
 drivers/watchdog/wdt_pci.c                      |  2 --
 drivers/xen/evtchn.c                            |  1 -
 drivers/xen/mcelog.c                            |  1 -
 drivers/xen/xenbus/xenbus_dev_frontend.c        |  1 -
 fs/debugfs/file.c                               |  1 -
 fs/dlm/debug_fs.c                               |  1 -
 fs/efivarfs/file.c                              |  1 -
 fs/file_table.c                                 |  2 ++
 fs/fsopen.c                                     |  1 -
 fs/fuse/control.c                               |  4 ----
 fs/fuse/dev.c                                   |  1 -
 fs/ksmbd/vfs.c                                  |  4 ++--
 fs/nsfs.c                                       |  1 -
 fs/open.c                                       |  2 ++
 fs/pipe.c                                       |  1 -
 fs/splice.c                                     | 10 ++++------
 fs/ubifs/debug.c                                |  2 --
 include/linux/debugfs.h                         |  1 -
 kernel/bpf/bpf_iter.c                           |  1 -
 kernel/events/core.c                            |  1 -
 kernel/power/user.c                             |  1 -
 kernel/relay.c                                  |  1 -
 kernel/time/posix-clock.c                       |  1 -
 kernel/trace/trace.c                            |  3 ---
 mm/huge_memory.c                                |  1 -
 net/mac80211/rc80211_minstrel_ht_debugfs.c      |  2 --
 net/rfkill/core.c                               |  1 -
 net/socket.c                                    |  1 -
 net/sunrpc/cache.c                              |  4 ----
 net/sunrpc/rpc_pipe.c                           |  1 -
 scripts/coccinelle/api/stream_open.cocci        |  1 -
 sound/core/control.c                            |  1 -
 sound/core/oss/mixer_oss.c                      |  1 -
 sound/core/oss/pcm_oss.c                        |  1 -
 sound/core/pcm_native.c                         |  2 --
 sound/core/rawmidi.c                            |  1 -
 sound/core/seq/seq_clientmgr.c                  |  1 -
 sound/core/timer.c                              |  1 -
 sound/oss/dmasound/dmasound_core.c              |  3 ---
 virt/kvm/kvm_main.c                             |  1 -
 223 files changed, 11 insertions(+), 283 deletions(-)

-- 
2.35.1

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