From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D616FC433EF for ; Wed, 29 Jun 2022 13:07:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233707AbiF2NHU (ORCPT ); Wed, 29 Jun 2022 09:07:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39240 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233709AbiF2NHR (ORCPT ); Wed, 29 Jun 2022 09:07:17 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CC972E9DD for ; Wed, 29 Jun 2022 06:07:11 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A3A54B82477 for ; Wed, 29 Jun 2022 13:07:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DBC3C34114; Wed, 29 Jun 2022 13:07:08 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="VnbF8BGD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1656508026; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=zaoftG1oOck9I7dul0J3l13B1c7KGuasF0GaoB5PXy8=; b=VnbF8BGDU/5z5f3VUgKNNKY1qiPMBSgbhv6EOyk4HbrI4P+HAin/ALx0WaDYd/NlEkXY9E Zkds2pg750bLlsa3h1WiEwJOsRsCcrdvrdv92tEo8dHV2N/DuhPEXHMajog3CYOMqUI4eB 2ST1Xl6+R0uO89GL5+GT/f9rQpGfO0o= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id ec0e30b7 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Wed, 29 Jun 2022 13:07:06 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Cc: "Jason A. Donenfeld" Subject: [PATCH v3 0/7] cleanup llseek and splice Date: Wed, 29 Jun 2022 15:06:55 +0200 Message-Id: <20220629130702.954310-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. With FMODE_LSEEK as good information, the series is able to adjust internal pipe splicing to use that. It is then able to remove no_llseek entirely, and make all checks use FMODE_LSEEK and all invocations use vfs_llseek. Along the way the series also fixes related bugs in ksmbd, dma-buf, and vfio. Changes v2->v3: - Do `if (!a) return -error; return 0;` rather than `if (a) return 0; return -error;` for Christophe. - Drop the ksmbd patch, because Steve already sent it up to Linus. - Accumuate various acks. Jason A. Donenfeld (7): fs: do not set no_llseek in fops fs: clear or set FMODE_LSEEK based on llseek function fs: check FMODE_LSEEK to control internal pipe splicing fs: do not compare against ->llseek fs: remove no_llseek 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 | 4 +--- 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/coredump.c | 4 ++-- 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/nsfs.c | 1 - fs/open.c | 2 ++ fs/overlayfs/copy_up.c | 3 +-- fs/pipe.c | 1 - fs/read_write.c | 17 +++-------------- fs/splice.c | 10 ++++------ fs/ubifs/debug.c | 2 -- include/linux/debugfs.h | 1 - include/linux/fs.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 - 226 files changed, 16 insertions(+), 302 deletions(-) -- 2.35.1