f5f4199c10
These patches extend FUSE to be able to act as a stacked filesystem. This allows pure passthrough, where the fuse file system simply reflects the lower filesystem, and also allows optional pre and post filtering in BPF and/or the userspace daemon as needed. This can dramatically reduce or even eliminate transitions to and from userspace. See https://lwn.net/Articles/915717/ Note that this patch set has been extensively tested in common-android13-5.10 This is a squash of these changes cherry-picked from common-android13-5.10 ANDROID: fuse-bpf: Make compile and pass test ANDROID: fuse-bpf: set error_in to ENOENT in negative lookup ANDROID: fuse-bpf: Add ability to run ranges of tests to fuse_test ANDROID: fuse-bpf: Add test for lookup postfilter ANDROID: fuse-bpf: readddir postfilter fixes ANDROID: fix kernelci error in fs/fuse/dir.c ANDROID: fuse-bpf: Fix RCU/reference issue ANDROID: fuse-bpf: Always call revalidate for backing ANDROID: fuse-bpf: Adjust backing handle funcs ANDROID: fuse-bpf: Fix revalidate error path and backing handling ANDROID: fuse-bpf: Fix use of get_fuse_inode ANDROID: fuse: Don't use readdirplus w/ nodeid 0 ANDROID: fuse-bpf: Introduce readdirplus test case for fuse bpf ANDROID: fuse-bpf: Make sure force_again flag is false by default ANDROID: fuse-bpf: Make inodes with backing_fd reachable for regular FUSE fuse_iget Revert "ANDROID: fuse-bpf: use target instead of parent inode to execute backing revalidate" ANDROID: fuse-bpf: use target instead of parent inode to execute backing revalidate ANDROID: fuse-bpf: Fix misuse of args.out_args ANDROID: fuse-bpf: Fix non-fusebpf build ANDROID: fuse-bpf: Use fuse_bpf_args in uapi ANDROID: fuse-bpf: Fix read_iter ANDROID: fuse-bpf: Use cache and refcount ANDROID: fuse-bpf: Rename iocb_fuse to iocb_orig ANDROID: fuse-bpf: Fix fixattr in rename ANDROID: fuse-bpf: Fix readdir ANDROID: fuse-bpf: Fix lseek return value for offset 0 ANDROID: fuse-bpf: fix read_iter and write_iter ANDROID: fuse-bpf: fix special devices ANDROID: fuse-bpf: support FUSE_LSEEK ANDROID: fuse-bpf: Add support for FUSE_COPY_FILE_RANGE ANDROID: fuse-bpf: Report errors to finalize ANDROID: fuse-bpf: Avoid reusing uint64_t for file ANDROID: fuse-bpf: Fix CONFIG_FUSE_BPF typo in FUSE_FSYNCDIR ANDROID: fuse-bpf: Move fd operations to be synchronous ANDROID: fuse-bpf: Invalidate if lower is unhashed ANDROID: fuse-bpf: Move bpf earlier in fuse_permission ANDROID: fuse-bpf: Update attributes on file write ANDROID: fuse: allow mounting with no userspace daemon ANDROID: fuse-bpf: Support FUSE_STATFS ANDROID: fuse-bpf: Fix filldir ANDROID: fuse-bpf: fix fuse_create_open_finalize ANDROID: fuse: add bpf support for removexattr ANDROID: fuse-bpf: Fix truncate ANDROID: fuse-bpf: Support inotify ANDROID: fuse-bpf: Make compile with CONFIG_FUSE but no CONFIG_FUSE_BPF ANDROID: fuse-bpf: Fix perms on readdir ANDROID: fuse: Fix umasking in backing ANDROID: fs/fuse: Backing move returns EXDEV if TO not backed ANDROID: bpf-fuse: Fix Setattr ANDROID: fuse-bpf: Check if mkdir dentry setup ANDROID: fuse-bpf: Close backing fds in fuse_dentry_revalidate ANDROID: fuse-bpf: Close backing-fd on both paths ANDROID: fuse-bpf: Partial fix for mmap'd files ANDROID: fuse-bpf: Restore a missing const ANDROID: Add fuse-bpf self tests ANDROID: Add FUSE_BPF to gki_defconfig ANDROID: fuse-bpf v1 ANDROID: fuse: Move functions in preparation for fuse-bpf Bug: 202785178 Test: test_fuse passes on linux. On cuttlefish, atest android.scopedstorage.cts.host.ScopedStorageHostTest passes with fuse-bpf enabled and disabled Change-Id: Idb099c281f9b39ff2c46fa3ebc63e508758416ee Signed-off-by: Paul Lawrence <paullawrence@google.com> Signed-off-by: Daniel Rosenberg <drosen@google.com>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause WITH Linux-syscall-note */
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/* Copyright (c) 2022 Google LLC */
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#ifndef _LINUX_ANDROID_FUSE_H
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#define _LINUX_ANDROID_FUSE_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#else
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#include <stdint.h>
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#endif
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#define FUSE_ACTION_KEEP 0
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#define FUSE_ACTION_REMOVE 1
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#define FUSE_ACTION_REPLACE 2
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struct fuse_entry_bpf_out {
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uint64_t backing_action;
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uint64_t backing_fd;
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uint64_t bpf_action;
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uint64_t bpf_fd;
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};
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struct fuse_entry_bpf {
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struct fuse_entry_bpf_out out;
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struct file *backing_file;
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struct file *bpf_file;
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};
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struct fuse_read_out {
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uint64_t offset;
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uint32_t again;
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uint32_t padding;
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};
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struct fuse_in_postfilter_header {
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uint32_t len;
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uint32_t opcode;
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uint64_t unique;
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uint64_t nodeid;
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uint32_t uid;
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uint32_t gid;
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uint32_t pid;
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uint32_t error_in;
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};
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/*
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* Fuse BPF Args
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*
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* Used to communicate with bpf programs to allow checking or altering certain values.
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* The end_offset allows the bpf verifier to check boundaries statically. This reflects
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* the ends of the buffer. size shows the length that was actually used.
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*
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*/
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/** One input argument of a request */
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struct fuse_bpf_in_arg {
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uint32_t size;
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const void *value;
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const void *end_offset;
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};
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/** One output argument of a request */
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struct fuse_bpf_arg {
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uint32_t size;
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void *value;
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void *end_offset;
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};
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#define FUSE_MAX_IN_ARGS 5
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#define FUSE_MAX_OUT_ARGS 3
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#define FUSE_BPF_FORCE (1 << 0)
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#define FUSE_BPF_OUT_ARGVAR (1 << 6)
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struct fuse_bpf_args {
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uint64_t nodeid;
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uint32_t opcode;
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uint32_t error_in;
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uint32_t in_numargs;
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uint32_t out_numargs;
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uint32_t flags;
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struct fuse_bpf_in_arg in_args[FUSE_MAX_IN_ARGS];
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struct fuse_bpf_arg out_args[FUSE_MAX_OUT_ARGS];
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};
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#define FUSE_BPF_USER_FILTER 1
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#define FUSE_BPF_BACKING 2
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#define FUSE_BPF_POST_FILTER 4
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#define FUSE_OPCODE_FILTER 0x0ffff
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#define FUSE_PREFILTER 0x10000
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#define FUSE_POSTFILTER 0x20000
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struct bpf_prog *fuse_get_bpf_prog(struct file *file);
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#endif /* _LINUX_ANDROID_FUSE_H */
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