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* refs/heads/tmp-cd1eb9f: Revert "net: qrtr: Stop rx_worker before freeing node" Linux 4.19.77 drm/amd/display: Restore backlight brightness after system resume mm/compaction.c: clear total_{migrate,free}_scanned before scanning a new zone fuse: fix deadlock with aio poll and fuse_iqueue::waitq.lock md/raid0: avoid RAID0 data corruption due to layout confusion. CIFS: Fix oplock handling for SMB 2.1+ protocols CIFS: fix max ea value size i2c: riic: Clear NACK in tend isr hwrng: core - don't wait on add_early_randomness() quota: fix wrong condition in is_quota_modification() ext4: fix punch hole for inline_data file systems ext4: fix warning inside ext4_convert_unwritten_extents_endio /dev/mem: Bail out upon SIGKILL. cfg80211: Purge frame registrations on iftype change md: only call set_in_sync() when it is expected to succeed. md: don't report active array_state until after revalidate_disk() completes. md/raid6: Set R5_ReadError when there is read failure on parity disk Btrfs: fix race setting up and completing qgroup rescan workers btrfs: qgroup: Fix reserved data space leak if we have multiple reserve calls btrfs: qgroup: Fix the wrong target io_tree when freeing reserved data space btrfs: Relinquish CPUs in btrfs_compare_trees Btrfs: fix use-after-free when using the tree modification log btrfs: fix allocation of free space cache v1 bitmap pages ovl: filter of trusted xattr results in audit ovl: Fix dereferencing possible ERR_PTR() smb3: allow disabling requesting leases block: fix null pointer dereference in blk_mq_rq_timed_out() i40e: check __I40E_VF_DISABLE bit in i40e_sync_filters_subtask memcg, kmem: do not fail __GFP_NOFAIL charges memcg, oom: don't require __GFP_FS when invoking memcg OOM killer gfs2: clear buf_in_tr when ending a transaction in sweep_bh_for_rgrps efifb: BGRT: Improve efifb_bgrt_sanity_check regulator: Defer init completion for a while after late_initcall alarmtimer: Use EOPNOTSUPP instead of ENOTSUPP arm64: dts: rockchip: limit clock rate of MMC controllers for RK3328 arm64: tlb: Ensure we execute an ISB following walk cache invalidation Revert "arm64: Remove unnecessary ISBs from set_{pte,pmd,pud}" ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up ARM: samsung: Fix system restart on S3C6410 ASoC: Intel: Fix use of potentially uninitialized variable ASoC: Intel: Skylake: Use correct function to access iomem space ASoC: Intel: NHLT: Fix debug print format binfmt_elf: Do not move brk for INTERP-less ET_EXEC media: don't drop front-end reference count for ->detach media: sn9c20x: Add MSI MS-1039 laptop to flip_dmi_table KVM: x86: Manually calculate reserved bits when loading PDPTRS KVM: x86: set ctxt->have_exception in x86_decode_insn() KVM: x86: always stop emulation on page fault parisc: Disable HP HSC-PCI Cards to prevent kernel crash fuse: fix missing unlock_page in fuse_writepage() powerpc/imc: Dont create debugfs files for cpu-less nodes scsi: implement .cleanup_rq callback blk-mq: add callback of .cleanup_rq ALSA: hda/realtek - PCI quirk for Medion E4254 ceph: use ceph_evict_inode to cleanup inode's resource Revert "ceph: use ceph_evict_inode to cleanup inode's resource" randstruct: Check member structs in is_pure_ops_struct() IB/hfi1: Define variables as unsigned long to fix KASAN warning IB/mlx5: Free mpi in mp_slave mode printk: Do not lose last line in kmsg buffer dump scsi: qla2xxx: Fix Relogin to prevent modifying scan_state flag scsi: scsi_dh_rdac: zero cdb in send_mode_select() ALSA: firewire-tascam: check intermediate state of clock status and retry ALSA: firewire-tascam: handle error code when getting current source of clock iwlwifi: fw: don't send GEO_TX_POWER_LIMIT command to FW version 36 PM / devfreq: passive: fix compiler warning media: omap3isp: Set device on omap3isp subdevs btrfs: extent-tree: Make sure we only allocate extents from block groups with the same type iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems ALSA: hda/realtek - Blacklist PC beep for Lenovo ThinkCentre M73/93 media: ttusb-dec: Fix info-leak in ttusb_dec_send_command() drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2) ALSA: hda - Drop unsol event handler for Intel HDMI codecs e1000e: add workaround for possible stalled packet libertas: Add missing sentinel at end of if_usb.c fw_table raid5: don't increment read_errors on EILSEQ return mmc: dw_mmc: Re-store SDIO IRQs mask at system resume mmc: core: Add helper function to indicate if SDIO IRQs is enabled mmc: sdhci: Fix incorrect switch to HS mode mmc: core: Clarify sdio_irq_pending flag for MMC_CAP2_SDIO_IRQ_NOTHREAD raid5: don't set STRIPE_HANDLE to stripe which is in batch list ASoC: dmaengine: Make the pcm->name equal to pcm->id if the name is not set platform/x86: intel_pmc_core: Do not ioremap RAM x86/cpu: Add Tiger Lake to Intel family s390/crypto: xts-aes-s390 fix extra run-time crypto self tests finding kprobes: Prohibit probing on BUG() and WARN() address dmaengine: ti: edma: Do not reset reserved paRAM slots md/raid1: fail run raid1 array when active disk less than one hwmon: (acpi_power_meter) Change log level for 'unsafe software power cap' closures: fix a race on wakeup from closure_sync ACPI / PCI: fix acpi_pci_irq_enable() memory leak ACPI: custom_method: fix memory leaks ARM: dts: exynos: Mark LDO10 as always-on on Peach Pit/Pi Chromebooks libtraceevent: Change users plugin directory iommu/iova: Avoid false sharing on fq_timer_on libata/ahci: Drop PCS quirk for Denverton and beyond iommu/amd: Silence warnings under memory pressure ALSA: firewire-motu: add support for MOTU 4pre nvme-multipath: fix ana log nsid lookup when nsid is not found nvmet: fix data units read and written counters in SMART log x86/mm/pti: Handle unaligned address gracefully in pti_clone_pagetable() ASoC: fsl_ssi: Fix clock control issue in master mode x86/mm/pti: Do not invoke PTI functions when PTI is disabled arm64: kpti: ensure patched kernel text is fetched from PoU x86/apic/vector: Warn when vector space exhaustion breaks affinity sched/cpufreq: Align trace event behavior of fast switching ACPI / CPPC: do not require the _PSD method ASoC: es8316: fix headphone mixer volume table media: ov9650: add a sanity check perf trace beauty ioctl: Fix off-by-one error in cmd->string table media: saa7134: fix terminology around saa7134_i2c_eeprom_md7134_gate() media: cpia2_usb: fix memory leaks media: saa7146: add cleanup in hexium_attach() media: cec-notifier: clear cec_adap in cec_notifier_unregister PM / devfreq: exynos-bus: Correct clock enable sequence PM / devfreq: passive: Use non-devm notifiers EDAC/amd64: Decode syndrome before translating address EDAC/amd64: Recognize DRAM device type ECC capability libperf: Fix alignment trap with xyarray contents in 'perf stat' media: dvb-core: fix a memory leak bug posix-cpu-timers: Sanitize bogus WARNONS media: dvb-frontends: use ida for pll number media: mceusb: fix (eliminate) TX IR signal length limit nbd: add missing config put led: triggers: Fix a memory leak bug ASoC: sun4i-i2s: Don't use the oversample to calculate BCLK tools headers: Fixup bitsperlong per arch includes ASoC: uniphier: Fix double reset assersion when transitioning to suspend state media: hdpvr: add terminating 0 at end of string media: radio/si470x: kill urb on error ARM: dts: imx7-colibri: disable HS400 ARM: dts: imx7d: cl-som-imx7: make ethernet work again m68k: Prevent some compiler warnings in Coldfire builds net: lpc-enet: fix printk format strings media: imx: mipi csi-2: Don't fail if initial state times-out media: omap3isp: Don't set streaming state on random subdevs media: i2c: ov5645: Fix power sequence media: vsp1: fix memory leak of dl on error return path perf record: Support aarch64 random socket_id assignment dmaengine: iop-adma: use correct printk format strings media: rc: imon: Allow iMON RC protocol for ffdc 7e device media: em28xx: modules workqueue not inited for 2nd device media: fdp1: Reduce FCP not found message level to debug media: mtk-mdp: fix reference count on old device tree perf test vfs_getname: Disable ~/.perfconfig to get default output perf config: Honour $PERF_CONFIG env var to specify alternate .perfconfig media: gspca: zero usb_buf on error idle: Prevent late-arriving interrupts from disrupting offline sched/fair: Use rq_lock/unlock in online_fair_sched_group firmware: arm_scmi: Check if platform has released shmem before using efi: cper: print AER info of PCIe fatal error EDAC, pnd2: Fix ioremap() size in dnv_rd_reg() loop: Add LOOP_SET_DIRECT_IO to compat ioctl ACPI / processor: don't print errors for processorIDs == 0xff media: media/platform: fsl-viu.c: fix build for MICROBLAZE md: don't set In_sync if array is frozen md: don't call spare_active in md_reap_sync_thread if all member devices can't work md/raid1: end bio when the device faulty arm64/prefetch: fix a -Wtype-limits warning ASoC: rsnd: don't call clk_get_rate() under atomic context EDAC/altera: Use the proper type for the IRQ status bits ia64:unwind: fix double free for mod->arch.init_unw_table ALSA: usb-audio: Skip bSynchAddress endpoint check if it is invalid base: soc: Export soc_device_register/unregister APIs media: iguanair: add sanity checks EDAC/mc: Fix grain_bits calculation ALSA: i2c: ak4xxx-adda: Fix a possible null pointer dereference in build_adc_controls() ALSA: hda - Show the fatal CORB/RIRB error more clearly x86/apic: Soft disable APIC before initializing it x86/reboot: Always use NMI fallback when shutdown via reboot vector IPI fails sched/deadline: Fix bandwidth accounting at all levels after offline migration x86/apic: Make apic_pending_intr_clear() more robust sched/core: Fix CPU controller for !RT_GROUP_SCHED sched/fair: Fix imbalance due to CPU affinity time/tick-broadcast: Fix tick_broadcast_offline() lockdep complaint media: i2c: ov5640: Check for devm_gpiod_get_optional() error media: hdpvr: Add device num check and handling media: exynos4-is: fix leaked of_node references media: mtk-cir: lower de-glitch counter for rc-mm protocol media: dib0700: fix link error for dibx000_i2c_set_speed leds: leds-lp5562 allow firmware files up to the maximum length dmaengine: bcm2835: Print error in case setting DMA mask fails firmware: qcom_scm: Use proper types for dma mappings ASoC: sgtl5000: Fix charge pump source assignment ASoC: sgtl5000: Fix of unmute outputs on probe ASoC: tlv320aic31xx: suppress error message for EPROBE_DEFER regulator: lm363x: Fix off-by-one n_voltages for lm3632 ldo_vpos/ldo_vneg ALSA: hda: Flush interrupts on disabling nfp: flower: prevent memory leak in nfp_flower_spawn_phy_reprs nfc: enforce CAP_NET_RAW for raw sockets ieee802154: enforce CAP_NET_RAW for raw sockets ax25: enforce CAP_NET_RAW for raw sockets appletalk: enforce CAP_NET_RAW for raw sockets mISDN: enforce CAP_NET_RAW for raw sockets net/mlx5: Add device ID of upcoming BlueField-2 tcp: better handle TCP_USER_TIMEOUT in SYN_SENT state net: sched: fix possible crash in tcf_action_destroy() usbnet: sanity checking of packet sizes and device mtu usbnet: ignore endpoints with invalid wMaxPacketSize skge: fix checksum byte order sch_netem: fix a divide by zero in tabledist() ppp: Fix memory leak in ppp_write openvswitch: change type of UPCALL_PID attribute to NLA_UNSPEC nfp: flower: fix memory leak in nfp_flower_spawn_vnic_reprs net_sched: add max len check for TCA_KIND net/sched: act_sample: don't push mac header on ip6gre ingress net: qrtr: Stop rx_worker before freeing node net/phy: fix DP83865 10 Mbps HDX loopback disable function macsec: drop skb sk before calling gro_cells_receive cdc_ncm: fix divide-by-zero caused by invalid wMaxPacketSize arcnet: provide a buffer big enough to actually receive packets ANDROID: properly export new symbols with _GPL tag Conflicts: kernel/sched/cpufreq_schedutil.c mm/compaction.c Change-Id: I3f2cc4a1421480479b9040aa5eefe7e17437021d Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>
1001 lines
24 KiB
C
1001 lines
24 KiB
C
/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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*/
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#ifndef _FS_FUSE_I_H
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#define _FS_FUSE_I_H
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#include <linux/fuse.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/backing-dev.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/rbtree.h>
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#include <linux/poll.h>
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#include <linux/workqueue.h>
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#include <linux/kref.h>
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#include <linux/xattr.h>
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#include <linux/pid_namespace.h>
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#include <linux/refcount.h>
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#include <linux/user_namespace.h>
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/** Max number of pages that can be used in a single read request */
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#define FUSE_MAX_PAGES_PER_REQ 32
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/** Bias for fi->writectr, meaning new writepages must not be sent */
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#define FUSE_NOWRITE INT_MIN
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/** It could be as large as PATH_MAX, but would that have any uses? */
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#define FUSE_NAME_MAX 1024
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/** Number of dentries for each connection in the control filesystem */
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#define FUSE_CTL_NUM_DENTRIES 5
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/** Number of page pointers embedded in fuse_req */
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#define FUSE_REQ_INLINE_PAGES 1
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/** List of active connections */
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extern struct list_head fuse_conn_list;
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/** Global mutex protecting fuse_conn_list and the control filesystem */
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extern struct mutex fuse_mutex;
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/** Module parameters */
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extern unsigned max_user_bgreq;
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extern unsigned max_user_congthresh;
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/* One forget request */
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struct fuse_forget_link {
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struct fuse_forget_one forget_one;
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struct fuse_forget_link *next;
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};
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/** FUSE inode */
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struct fuse_inode {
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/** Inode data */
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struct inode inode;
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/** Unique ID, which identifies the inode between userspace
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* and kernel */
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u64 nodeid;
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/** Number of lookups on this inode */
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u64 nlookup;
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/** The request used for sending the FORGET message */
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struct fuse_forget_link *forget;
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/** Time in jiffies until the file attributes are valid */
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u64 i_time;
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/** The sticky bit in inode->i_mode may have been removed, so
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preserve the original mode */
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umode_t orig_i_mode;
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/** 64 bit inode number */
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u64 orig_ino;
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/** Version of last attribute change */
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u64 attr_version;
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/** Files usable in writepage. Protected by fc->lock */
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struct list_head write_files;
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/** Writepages pending on truncate or fsync */
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struct list_head queued_writes;
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/** Number of sent writes, a negative bias (FUSE_NOWRITE)
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* means more writes are blocked */
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int writectr;
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/** Waitq for writepage completion */
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wait_queue_head_t page_waitq;
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/** List of writepage requestst (pending or sent) */
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struct list_head writepages;
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/** Miscellaneous bits describing inode state */
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unsigned long state;
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/** Lock for serializing lookup and readdir for back compatibility*/
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struct mutex mutex;
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};
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/** FUSE inode state bits */
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enum {
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/** Advise readdirplus */
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FUSE_I_ADVISE_RDPLUS,
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/** Initialized with readdirplus */
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FUSE_I_INIT_RDPLUS,
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/** An operation changing file size is in progress */
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FUSE_I_SIZE_UNSTABLE,
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};
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struct fuse_conn;
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/** FUSE specific file data */
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struct fuse_file {
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/** Fuse connection for this file */
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struct fuse_conn *fc;
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/** Request reserved for flush and release */
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struct fuse_req *reserved_req;
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/** Kernel file handle guaranteed to be unique */
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u64 kh;
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/** File handle used by userspace */
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u64 fh;
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/** Node id of this file */
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u64 nodeid;
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/** Refcount */
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refcount_t count;
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/** FOPEN_* flags returned by open */
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u32 open_flags;
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/** Entry on inode's write_files list */
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struct list_head write_entry;
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/** RB node to be linked on fuse_conn->polled_files */
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struct rb_node polled_node;
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/** Wait queue head for poll */
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wait_queue_head_t poll_wait;
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/** Has flock been performed on this file? */
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bool flock:1;
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};
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/** One input argument of a request */
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struct fuse_in_arg {
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unsigned size;
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const void *value;
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};
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/** The request input */
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struct fuse_in {
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/** The request header */
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struct fuse_in_header h;
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/** True if the data for the last argument is in req->pages */
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unsigned argpages:1;
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/** Number of arguments */
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unsigned numargs;
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/** Array of arguments */
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struct fuse_in_arg args[3];
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};
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/** One output argument of a request */
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struct fuse_arg {
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unsigned size;
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void *value;
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};
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/** The request output */
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struct fuse_out {
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/** Header returned from userspace */
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struct fuse_out_header h;
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/*
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* The following bitfields are not changed during the request
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* processing
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*/
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/** Last argument is variable length (can be shorter than
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arg->size) */
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unsigned argvar:1;
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/** Last argument is a list of pages to copy data to */
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unsigned argpages:1;
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/** Zero partially or not copied pages */
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unsigned page_zeroing:1;
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/** Pages may be replaced with new ones */
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unsigned page_replace:1;
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/** Number or arguments */
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unsigned numargs;
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/** Array of arguments */
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struct fuse_arg args[2];
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};
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/** FUSE page descriptor */
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struct fuse_page_desc {
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unsigned int length;
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unsigned int offset;
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};
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struct fuse_args {
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struct {
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struct {
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uint32_t opcode;
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uint64_t nodeid;
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} h;
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unsigned numargs;
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struct fuse_in_arg args[3];
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} in;
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struct {
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unsigned argvar:1;
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unsigned numargs;
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struct fuse_arg args[2];
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} out;
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};
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#define FUSE_ARGS(args) struct fuse_args args = {}
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/** The request IO state (for asynchronous processing) */
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struct fuse_io_priv {
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struct kref refcnt;
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int async;
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spinlock_t lock;
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unsigned reqs;
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ssize_t bytes;
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size_t size;
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__u64 offset;
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bool write;
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bool should_dirty;
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int err;
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struct kiocb *iocb;
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struct completion *done;
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bool blocking;
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};
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#define FUSE_IO_PRIV_SYNC(i) \
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{ \
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.refcnt = KREF_INIT(1), \
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.async = 0, \
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.iocb = i, \
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}
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/**
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* Request flags
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*
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* FR_ISREPLY: set if the request has reply
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* FR_FORCE: force sending of the request even if interrupted
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* FR_BACKGROUND: request is sent in the background
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* FR_WAITING: request is counted as "waiting"
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* FR_ABORTED: the request was aborted
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* FR_INTERRUPTED: the request has been interrupted
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* FR_LOCKED: data is being copied to/from the request
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* FR_PENDING: request is not yet in userspace
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* FR_SENT: request is in userspace, waiting for an answer
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* FR_FINISHED: request is finished
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* FR_PRIVATE: request is on private list
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*/
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enum fuse_req_flag {
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FR_ISREPLY,
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FR_FORCE,
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FR_BACKGROUND,
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FR_WAITING,
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FR_ABORTED,
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FR_INTERRUPTED,
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FR_LOCKED,
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FR_PENDING,
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FR_SENT,
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FR_FINISHED,
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FR_PRIVATE,
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};
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/**
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* A request to the client
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*
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* .waitq.lock protects the following fields:
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* - FR_ABORTED
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* - FR_LOCKED (may also be modified under fc->lock, tested under both)
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*/
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struct fuse_req {
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/** This can be on either pending processing or io lists in
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fuse_conn */
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struct list_head list;
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/** Entry on the interrupts list */
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struct list_head intr_entry;
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/** refcount */
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refcount_t count;
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/** Unique ID for the interrupt request */
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u64 intr_unique;
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/* Request flags, updated with test/set/clear_bit() */
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unsigned long flags;
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/** The request input */
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struct fuse_in in;
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/** The request output */
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struct fuse_out out;
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/** Used to wake up the task waiting for completion of request*/
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wait_queue_head_t waitq;
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/** Data for asynchronous requests */
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union {
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struct {
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struct fuse_release_in in;
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struct inode *inode;
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} release;
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struct fuse_init_in init_in;
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struct fuse_init_out init_out;
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struct cuse_init_in cuse_init_in;
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struct {
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struct fuse_read_in in;
|
|
u64 attr_ver;
|
|
} read;
|
|
struct {
|
|
struct fuse_write_in in;
|
|
struct fuse_write_out out;
|
|
struct fuse_req *next;
|
|
} write;
|
|
struct fuse_notify_retrieve_in retrieve_in;
|
|
} misc;
|
|
|
|
/** page vector */
|
|
struct page **pages;
|
|
|
|
/** page-descriptor vector */
|
|
struct fuse_page_desc *page_descs;
|
|
|
|
/** size of the 'pages' array */
|
|
unsigned max_pages;
|
|
|
|
/** inline page vector */
|
|
struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
|
|
|
|
/** inline page-descriptor vector */
|
|
struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
|
|
|
|
/** number of pages in vector */
|
|
unsigned num_pages;
|
|
|
|
/** File used in the request (or NULL) */
|
|
struct fuse_file *ff;
|
|
|
|
/** Inode used in the request or NULL */
|
|
struct inode *inode;
|
|
|
|
/** Path used for completing d_canonical_path */
|
|
struct path *canonical_path;
|
|
|
|
/** AIO control block */
|
|
struct fuse_io_priv *io;
|
|
|
|
/** Link on fi->writepages */
|
|
struct list_head writepages_entry;
|
|
|
|
/** Request completion callback */
|
|
void (*end)(struct fuse_conn *, struct fuse_req *);
|
|
|
|
/** Request is stolen from fuse_file->reserved_req */
|
|
struct file *stolen_file;
|
|
};
|
|
|
|
struct fuse_iqueue {
|
|
/** Connection established */
|
|
unsigned connected;
|
|
|
|
/** Lock protecting accesses to members of this structure */
|
|
spinlock_t lock;
|
|
|
|
/** Readers of the connection are waiting on this */
|
|
wait_queue_head_t waitq;
|
|
|
|
/** The next unique request id */
|
|
u64 reqctr;
|
|
|
|
/** The list of pending requests */
|
|
struct list_head pending;
|
|
|
|
/** Pending interrupts */
|
|
struct list_head interrupts;
|
|
|
|
/** Queue of pending forgets */
|
|
struct fuse_forget_link forget_list_head;
|
|
struct fuse_forget_link *forget_list_tail;
|
|
|
|
/** Batching of FORGET requests (positive indicates FORGET batch) */
|
|
int forget_batch;
|
|
|
|
/** O_ASYNC requests */
|
|
struct fasync_struct *fasync;
|
|
};
|
|
|
|
struct fuse_pqueue {
|
|
/** Connection established */
|
|
unsigned connected;
|
|
|
|
/** Lock protecting accessess to members of this structure */
|
|
spinlock_t lock;
|
|
|
|
/** The list of requests being processed */
|
|
struct list_head processing;
|
|
|
|
/** The list of requests under I/O */
|
|
struct list_head io;
|
|
};
|
|
|
|
/**
|
|
* Fuse device instance
|
|
*/
|
|
struct fuse_dev {
|
|
/** Fuse connection for this device */
|
|
struct fuse_conn *fc;
|
|
|
|
/** Processing queue */
|
|
struct fuse_pqueue pq;
|
|
|
|
/** list entry on fc->devices */
|
|
struct list_head entry;
|
|
};
|
|
|
|
/**
|
|
* A Fuse connection.
|
|
*
|
|
* This structure is created, when the filesystem is mounted, and is
|
|
* destroyed, when the client device is closed and the filesystem is
|
|
* unmounted.
|
|
*/
|
|
struct fuse_conn {
|
|
/** Lock protecting accessess to members of this structure */
|
|
spinlock_t lock;
|
|
|
|
/** Refcount */
|
|
refcount_t count;
|
|
|
|
/** Number of fuse_dev's */
|
|
atomic_t dev_count;
|
|
|
|
struct rcu_head rcu;
|
|
|
|
/** The user id for this mount */
|
|
kuid_t user_id;
|
|
|
|
/** The group id for this mount */
|
|
kgid_t group_id;
|
|
|
|
/** The pid namespace for this mount */
|
|
struct pid_namespace *pid_ns;
|
|
|
|
/** The user namespace for this mount */
|
|
struct user_namespace *user_ns;
|
|
|
|
/** Maximum read size */
|
|
unsigned max_read;
|
|
|
|
/** Maximum write size */
|
|
unsigned max_write;
|
|
|
|
/** Input queue */
|
|
struct fuse_iqueue iq;
|
|
|
|
/** The next unique kernel file handle */
|
|
u64 khctr;
|
|
|
|
/** rbtree of fuse_files waiting for poll events indexed by ph */
|
|
struct rb_root polled_files;
|
|
|
|
/** Maximum number of outstanding background requests */
|
|
unsigned max_background;
|
|
|
|
/** Number of background requests at which congestion starts */
|
|
unsigned congestion_threshold;
|
|
|
|
/** Number of requests currently in the background */
|
|
unsigned num_background;
|
|
|
|
/** Number of background requests currently queued for userspace */
|
|
unsigned active_background;
|
|
|
|
/** The list of background requests set aside for later queuing */
|
|
struct list_head bg_queue;
|
|
|
|
/** Flag indicating that INIT reply has been received. Allocating
|
|
* any fuse request will be suspended until the flag is set */
|
|
int initialized;
|
|
|
|
/** Flag indicating if connection is blocked. This will be
|
|
the case before the INIT reply is received, and if there
|
|
are too many outstading backgrounds requests */
|
|
int blocked;
|
|
|
|
/** waitq for blocked connection */
|
|
wait_queue_head_t blocked_waitq;
|
|
|
|
/** waitq for reserved requests */
|
|
wait_queue_head_t reserved_req_waitq;
|
|
|
|
/** Connection established, cleared on umount, connection
|
|
abort and device release */
|
|
unsigned connected;
|
|
|
|
/** Connection aborted via sysfs */
|
|
bool aborted;
|
|
|
|
/** Connection failed (version mismatch). Cannot race with
|
|
setting other bitfields since it is only set once in INIT
|
|
reply, before any other request, and never cleared */
|
|
unsigned conn_error:1;
|
|
|
|
/** Connection successful. Only set in INIT */
|
|
unsigned conn_init:1;
|
|
|
|
/** Do readpages asynchronously? Only set in INIT */
|
|
unsigned async_read:1;
|
|
|
|
/** Return an unique read error after abort. Only set in INIT */
|
|
unsigned abort_err:1;
|
|
|
|
/** Do not send separate SETATTR request before open(O_TRUNC) */
|
|
unsigned atomic_o_trunc:1;
|
|
|
|
/** Filesystem supports NFS exporting. Only set in INIT */
|
|
unsigned export_support:1;
|
|
|
|
/** write-back cache policy (default is write-through) */
|
|
unsigned writeback_cache:1;
|
|
|
|
/** allow parallel lookups and readdir (default is serialized) */
|
|
unsigned parallel_dirops:1;
|
|
|
|
/** handle fs handles killing suid/sgid/cap on write/chown/trunc */
|
|
unsigned handle_killpriv:1;
|
|
|
|
/*
|
|
* The following bitfields are only for optimization purposes
|
|
* and hence races in setting them will not cause malfunction
|
|
*/
|
|
|
|
/** Is open/release not implemented by fs? */
|
|
unsigned no_open:1;
|
|
|
|
/** Is fsync not implemented by fs? */
|
|
unsigned no_fsync:1;
|
|
|
|
/** Is fsyncdir not implemented by fs? */
|
|
unsigned no_fsyncdir:1;
|
|
|
|
/** Is flush not implemented by fs? */
|
|
unsigned no_flush:1;
|
|
|
|
/** Is setxattr not implemented by fs? */
|
|
unsigned no_setxattr:1;
|
|
|
|
/** Is getxattr not implemented by fs? */
|
|
unsigned no_getxattr:1;
|
|
|
|
/** Is listxattr not implemented by fs? */
|
|
unsigned no_listxattr:1;
|
|
|
|
/** Is removexattr not implemented by fs? */
|
|
unsigned no_removexattr:1;
|
|
|
|
/** Are posix file locking primitives not implemented by fs? */
|
|
unsigned no_lock:1;
|
|
|
|
/** Is access not implemented by fs? */
|
|
unsigned no_access:1;
|
|
|
|
/** Is create not implemented by fs? */
|
|
unsigned no_create:1;
|
|
|
|
/** Is interrupt not implemented by fs? */
|
|
unsigned no_interrupt:1;
|
|
|
|
/** Is bmap not implemented by fs? */
|
|
unsigned no_bmap:1;
|
|
|
|
/** Is poll not implemented by fs? */
|
|
unsigned no_poll:1;
|
|
|
|
/** Do multi-page cached writes */
|
|
unsigned big_writes:1;
|
|
|
|
/** Don't apply umask to creation modes */
|
|
unsigned dont_mask:1;
|
|
|
|
/** Are BSD file locking primitives not implemented by fs? */
|
|
unsigned no_flock:1;
|
|
|
|
/** Is fallocate not implemented by fs? */
|
|
unsigned no_fallocate:1;
|
|
|
|
/** Is rename with flags implemented by fs? */
|
|
unsigned no_rename2:1;
|
|
|
|
/** Use enhanced/automatic page cache invalidation. */
|
|
unsigned auto_inval_data:1;
|
|
|
|
/** Does the filesystem support readdirplus? */
|
|
unsigned do_readdirplus:1;
|
|
|
|
/** Does the filesystem want adaptive readdirplus? */
|
|
unsigned readdirplus_auto:1;
|
|
|
|
/** Does the filesystem support asynchronous direct-IO submission? */
|
|
unsigned async_dio:1;
|
|
|
|
/** Is lseek not implemented by fs? */
|
|
unsigned no_lseek:1;
|
|
|
|
/** Does the filesystem support posix acls? */
|
|
unsigned posix_acl:1;
|
|
|
|
/** Check permissions based on the file mode or not? */
|
|
unsigned default_permissions:1;
|
|
|
|
/** Allow other than the mounter user to access the filesystem ? */
|
|
unsigned allow_other:1;
|
|
|
|
/** The number of requests waiting for completion */
|
|
atomic_t num_waiting;
|
|
|
|
/** Negotiated minor version */
|
|
unsigned minor;
|
|
|
|
/** Entry on the fuse_conn_list */
|
|
struct list_head entry;
|
|
|
|
/** Device ID from super block */
|
|
dev_t dev;
|
|
|
|
/** Dentries in the control filesystem */
|
|
struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
|
|
|
|
/** number of dentries used in the above array */
|
|
int ctl_ndents;
|
|
|
|
/** Key for lock owner ID scrambling */
|
|
u32 scramble_key[4];
|
|
|
|
/** Reserved request for the DESTROY message */
|
|
struct fuse_req *destroy_req;
|
|
|
|
/** Version counter for attribute changes */
|
|
u64 attr_version;
|
|
|
|
/** Called on final put */
|
|
void (*release)(struct fuse_conn *);
|
|
|
|
/** Super block for this connection. */
|
|
struct super_block *sb;
|
|
|
|
/** Read/write semaphore to hold when accessing sb. */
|
|
struct rw_semaphore killsb;
|
|
|
|
/** List of device instances belonging to this connection */
|
|
struct list_head devices;
|
|
};
|
|
|
|
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
|
|
{
|
|
return get_fuse_conn_super(inode->i_sb);
|
|
}
|
|
|
|
static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct fuse_inode, inode);
|
|
}
|
|
|
|
static inline u64 get_node_id(struct inode *inode)
|
|
{
|
|
return get_fuse_inode(inode)->nodeid;
|
|
}
|
|
|
|
/** Device operations */
|
|
extern const struct file_operations fuse_dev_operations;
|
|
|
|
extern const struct dentry_operations fuse_dentry_operations;
|
|
extern const struct dentry_operations fuse_root_dentry_operations;
|
|
|
|
/**
|
|
* Inode to nodeid comparison.
|
|
*/
|
|
int fuse_inode_eq(struct inode *inode, void *_nodeidp);
|
|
|
|
/**
|
|
* Get a filled in inode
|
|
*/
|
|
struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
|
|
int generation, struct fuse_attr *attr,
|
|
u64 attr_valid, u64 attr_version);
|
|
|
|
int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
|
|
struct fuse_entry_out *outarg, struct inode **inode);
|
|
|
|
/**
|
|
* Send FORGET command
|
|
*/
|
|
void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
|
|
u64 nodeid, u64 nlookup);
|
|
|
|
struct fuse_forget_link *fuse_alloc_forget(void);
|
|
|
|
/* Used by READDIRPLUS */
|
|
void fuse_force_forget(struct file *file, u64 nodeid);
|
|
|
|
/**
|
|
* Initialize READ or READDIR request
|
|
*/
|
|
void fuse_read_fill(struct fuse_req *req, struct file *file,
|
|
loff_t pos, size_t count, int opcode);
|
|
|
|
/**
|
|
* Send OPEN or OPENDIR request
|
|
*/
|
|
int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
|
|
|
|
struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
|
|
void fuse_file_free(struct fuse_file *ff);
|
|
void fuse_finish_open(struct inode *inode, struct file *file);
|
|
|
|
void fuse_sync_release(struct fuse_file *ff, int flags);
|
|
|
|
/**
|
|
* Send RELEASE or RELEASEDIR request
|
|
*/
|
|
void fuse_release_common(struct file *file, bool isdir);
|
|
|
|
/**
|
|
* Send FSYNC or FSYNCDIR request
|
|
*/
|
|
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
|
|
int datasync, int isdir);
|
|
|
|
/**
|
|
* Notify poll wakeup
|
|
*/
|
|
int fuse_notify_poll_wakeup(struct fuse_conn *fc,
|
|
struct fuse_notify_poll_wakeup_out *outarg);
|
|
|
|
/**
|
|
* Initialize file operations on a regular file
|
|
*/
|
|
void fuse_init_file_inode(struct inode *inode);
|
|
|
|
/**
|
|
* Initialize inode operations on regular files and special files
|
|
*/
|
|
void fuse_init_common(struct inode *inode);
|
|
|
|
/**
|
|
* Initialize inode and file operations on a directory
|
|
*/
|
|
void fuse_init_dir(struct inode *inode);
|
|
|
|
/**
|
|
* Initialize inode operations on a symlink
|
|
*/
|
|
void fuse_init_symlink(struct inode *inode);
|
|
|
|
/**
|
|
* Change attributes of an inode
|
|
*/
|
|
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
|
|
u64 attr_valid, u64 attr_version);
|
|
|
|
void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
|
|
u64 attr_valid);
|
|
|
|
/**
|
|
* Initialize the client device
|
|
*/
|
|
int fuse_dev_init(void);
|
|
|
|
/**
|
|
* Cleanup the client device
|
|
*/
|
|
void fuse_dev_cleanup(void);
|
|
|
|
int fuse_ctl_init(void);
|
|
void __exit fuse_ctl_cleanup(void);
|
|
|
|
/**
|
|
* Allocate a request
|
|
*/
|
|
struct fuse_req *fuse_request_alloc(unsigned npages);
|
|
|
|
struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
|
|
|
|
/**
|
|
* Free a request
|
|
*/
|
|
void fuse_request_free(struct fuse_req *req);
|
|
|
|
/**
|
|
* Get a request, may fail with -ENOMEM,
|
|
* caller should specify # elements in req->pages[] explicitly
|
|
*/
|
|
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
|
|
struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
|
|
unsigned npages);
|
|
|
|
/*
|
|
* Increment reference count on request
|
|
*/
|
|
void __fuse_get_request(struct fuse_req *req);
|
|
|
|
/**
|
|
* Gets a requests for a file operation, always succeeds
|
|
*/
|
|
struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
|
|
struct file *file);
|
|
|
|
/**
|
|
* Decrement reference count of a request. If count goes to zero free
|
|
* the request.
|
|
*/
|
|
void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
|
|
|
|
/**
|
|
* Send a request (synchronous)
|
|
*/
|
|
void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
|
|
|
|
/**
|
|
* Simple request sending that does request allocation and freeing
|
|
*/
|
|
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
|
|
|
|
/**
|
|
* Send a request in the background
|
|
*/
|
|
void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
|
|
|
|
void fuse_request_send_background_locked(struct fuse_conn *fc,
|
|
struct fuse_req *req);
|
|
|
|
/* Abort all requests */
|
|
void fuse_abort_conn(struct fuse_conn *fc, bool is_abort);
|
|
void fuse_wait_aborted(struct fuse_conn *fc);
|
|
|
|
/**
|
|
* Invalidate inode attributes
|
|
*/
|
|
void fuse_invalidate_attr(struct inode *inode);
|
|
|
|
void fuse_invalidate_entry_cache(struct dentry *entry);
|
|
|
|
void fuse_invalidate_atime(struct inode *inode);
|
|
|
|
/**
|
|
* Acquire reference to fuse_conn
|
|
*/
|
|
struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
|
|
|
|
/**
|
|
* Initialize fuse_conn
|
|
*/
|
|
void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns);
|
|
|
|
/**
|
|
* Release reference to fuse_conn
|
|
*/
|
|
void fuse_conn_put(struct fuse_conn *fc);
|
|
|
|
struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
|
|
void fuse_dev_free(struct fuse_dev *fud);
|
|
|
|
/**
|
|
* Add connection to control filesystem
|
|
*/
|
|
int fuse_ctl_add_conn(struct fuse_conn *fc);
|
|
|
|
/**
|
|
* Remove connection from control filesystem
|
|
*/
|
|
void fuse_ctl_remove_conn(struct fuse_conn *fc);
|
|
|
|
/**
|
|
* Is file type valid?
|
|
*/
|
|
int fuse_valid_type(int m);
|
|
|
|
/**
|
|
* Is current process allowed to perform filesystem operation?
|
|
*/
|
|
int fuse_allow_current_process(struct fuse_conn *fc);
|
|
|
|
u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
|
|
|
|
void fuse_update_ctime(struct inode *inode);
|
|
|
|
int fuse_update_attributes(struct inode *inode, struct file *file);
|
|
|
|
void fuse_flush_writepages(struct inode *inode);
|
|
|
|
void fuse_set_nowrite(struct inode *inode);
|
|
void fuse_release_nowrite(struct inode *inode);
|
|
|
|
u64 fuse_get_attr_version(struct fuse_conn *fc);
|
|
|
|
/**
|
|
* File-system tells the kernel to invalidate cache for the given node id.
|
|
*/
|
|
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
|
|
loff_t offset, loff_t len);
|
|
|
|
/**
|
|
* File-system tells the kernel to invalidate parent attributes and
|
|
* the dentry matching parent/name.
|
|
*
|
|
* If the child_nodeid is non-zero and:
|
|
* - matches the inode number for the dentry matching parent/name,
|
|
* - is not a mount point
|
|
* - is a file or oan empty directory
|
|
* then the dentry is unhashed (d_delete()).
|
|
*/
|
|
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
|
|
u64 child_nodeid, struct qstr *name);
|
|
|
|
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
|
|
bool isdir);
|
|
|
|
/**
|
|
* fuse_direct_io() flags
|
|
*/
|
|
|
|
/** If set, it is WRITE; otherwise - READ */
|
|
#define FUSE_DIO_WRITE (1 << 0)
|
|
|
|
/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
|
|
#define FUSE_DIO_CUSE (1 << 1)
|
|
|
|
ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
|
|
loff_t *ppos, int flags);
|
|
long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
|
|
unsigned int flags);
|
|
long fuse_ioctl_common(struct file *file, unsigned int cmd,
|
|
unsigned long arg, unsigned int flags);
|
|
__poll_t fuse_file_poll(struct file *file, poll_table *wait);
|
|
int fuse_dev_release(struct inode *inode, struct file *file);
|
|
|
|
bool fuse_write_update_size(struct inode *inode, loff_t pos);
|
|
|
|
int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
|
|
int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
|
|
|
|
int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
|
|
struct file *file);
|
|
|
|
void fuse_set_initialized(struct fuse_conn *fc);
|
|
|
|
void fuse_unlock_inode(struct inode *inode, bool locked);
|
|
bool fuse_lock_inode(struct inode *inode);
|
|
|
|
int fuse_setxattr(struct inode *inode, const char *name, const void *value,
|
|
size_t size, int flags);
|
|
ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
|
|
size_t size);
|
|
ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
|
|
int fuse_removexattr(struct inode *inode, const char *name);
|
|
extern const struct xattr_handler *fuse_xattr_handlers[];
|
|
extern const struct xattr_handler *fuse_acl_xattr_handlers[];
|
|
extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
|
|
|
|
struct posix_acl;
|
|
struct posix_acl *fuse_get_acl(struct inode *inode, int type);
|
|
int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
|
|
|
|
#endif /* _FS_FUSE_I_H */
|