428 lines
12 KiB
C
428 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2007-2009 Google Inc. and Amit Singh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Copyright (C) 2005 Csaba Henk.
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* All rights reserved.
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*
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* Copyright (c) 2019 The FreeBSD Foundation
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*
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* Portions of this software were developed by BFF Storage Systems, LLC under
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* sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FUSE_IPC_H_
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#define _FUSE_IPC_H_
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#include <sys/param.h>
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#include <sys/refcount.h>
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enum fuse_data_cache_mode {
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FUSE_CACHE_UC,
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FUSE_CACHE_WT,
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FUSE_CACHE_WB,
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};
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struct fuse_iov {
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void *base;
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size_t len;
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size_t allocated_size;
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int credit;
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};
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void fiov_init(struct fuse_iov *fiov, size_t size);
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void fiov_teardown(struct fuse_iov *fiov);
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void fiov_refresh(struct fuse_iov *fiov);
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void fiov_adjust(struct fuse_iov *fiov, size_t size);
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#define FUSE_DIMALLOC(fiov, spc1, spc2, amnt) do { \
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fiov_adjust(fiov, (sizeof(*(spc1)) + (amnt))); \
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(spc1) = (fiov)->base; \
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(spc2) = (char *)(fiov)->base + (sizeof(*(spc1))); \
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} while (0)
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#define FU_AT_LEAST(siz) max((siz), 160)
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#define FUSE_ASSERT_AW_DONE(ftick) \
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KASSERT((ftick)->tk_aw_link.tqe_next == NULL && \
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(ftick)->tk_aw_link.tqe_prev == NULL, \
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("FUSE: ticket still on answer delivery list %p", (ftick)))
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#define FUSE_ASSERT_MS_DONE(ftick) \
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KASSERT((ftick)->tk_ms_link.stqe_next == NULL, \
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("FUSE: ticket still on message list %p", (ftick)))
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struct fuse_ticket;
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struct fuse_data;
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typedef int fuse_handler_t(struct fuse_ticket *ftick, struct uio *uio);
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struct fuse_ticket {
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/* fields giving the identity of the ticket */
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uint64_t tk_unique;
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struct fuse_data *tk_data;
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int tk_flag;
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u_int tk_refcount;
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/*
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* If this ticket's operation has been interrupted, this will hold the
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* unique value of the FUSE_INTERRUPT operation. Otherwise, it will be
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* 0.
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*/
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uint64_t irq_unique;
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/* fields for initiating an upgoing message */
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struct fuse_iov tk_ms_fiov;
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void *tk_ms_bufdata;
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size_t tk_ms_bufsize;
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enum { FT_M_FIOV, FT_M_BUF } tk_ms_type;
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STAILQ_ENTRY(fuse_ticket) tk_ms_link;
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/* fields for handling answers coming from userspace */
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struct fuse_iov tk_aw_fiov;
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void *tk_aw_bufdata;
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size_t tk_aw_bufsize;
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enum { FT_A_FIOV, FT_A_BUF } tk_aw_type;
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struct fuse_out_header tk_aw_ohead;
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int tk_aw_errno;
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struct mtx tk_aw_mtx;
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fuse_handler_t *tk_aw_handler;
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TAILQ_ENTRY(fuse_ticket) tk_aw_link;
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};
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#define FT_ANSW 0x01 /* request of ticket has already been answered */
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#define FT_DIRTY 0x04 /* ticket has been used */
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static inline struct fuse_iov *
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fticket_resp(struct fuse_ticket *ftick)
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{
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return (&ftick->tk_aw_fiov);
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}
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static inline bool
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fticket_answered(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_aw_mtx, MA_OWNED);
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return (ftick->tk_flag & FT_ANSW);
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}
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static inline void
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fticket_set_answered(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_aw_mtx, MA_OWNED);
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ftick->tk_flag |= FT_ANSW;
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}
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static inline struct fuse_in_header*
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fticket_in_header(struct fuse_ticket *ftick)
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{
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return (struct fuse_in_header *)(ftick->tk_ms_fiov.base);
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}
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static inline enum fuse_opcode
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fticket_opcode(struct fuse_ticket *ftick)
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{
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return fticket_in_header(ftick)->opcode;
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}
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int fticket_pull(struct fuse_ticket *ftick, struct uio *uio);
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/*
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* The data representing a FUSE session.
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*/
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struct fuse_data {
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struct cdev *fdev;
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struct mount *mp;
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struct vnode *vroot;
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struct ucred *daemoncred;
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int dataflags;
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int ref;
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struct mtx ms_mtx;
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STAILQ_HEAD(, fuse_ticket) ms_head;
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int ms_count;
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struct mtx aw_mtx;
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TAILQ_HEAD(, fuse_ticket) aw_head;
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/*
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* Holds the next value of the FUSE operation unique value.
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* Also, serves as a wakeup channel to prevent any operations from
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* being created before INIT completes.
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*/
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u_long ticketer;
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struct sx rename_lock;
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uint32_t fuse_libabi_major;
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uint32_t fuse_libabi_minor;
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uint32_t max_readahead_blocks;
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uint32_t max_write;
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uint32_t max_read;
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uint32_t subtype;
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char volname[MAXPATHLEN];
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struct selinfo ks_rsel;
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int daemon_timeout;
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unsigned time_gran;
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uint64_t notimpl;
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uint64_t mnt_flag;
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enum fuse_data_cache_mode cache_mode;
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};
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#define FSESS_DEAD 0x0001 /* session is to be closed */
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#define FSESS_INITED 0x0004 /* session has been inited */
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#define FSESS_DAEMON_CAN_SPY 0x0010 /* let non-owners access this fs */
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/* (and being observed by the daemon) */
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#define FSESS_PUSH_SYMLINKS_IN 0x0020 /* prefix absolute symlinks with mp */
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#define FSESS_DEFAULT_PERMISSIONS 0x0040 /* kernel does permission checking */
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#define FSESS_ASYNC_READ 0x1000 /* allow multiple reads of some file */
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#define FSESS_POSIX_LOCKS 0x2000 /* daemon supports POSIX locks */
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#define FSESS_EXPORT_SUPPORT 0x10000 /* daemon supports NFS-style lookups */
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#define FSESS_MNTOPTS_MASK ( \
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FSESS_DAEMON_CAN_SPY | FSESS_PUSH_SYMLINKS_IN | \
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FSESS_DEFAULT_PERMISSIONS)
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extern int fuse_data_cache_mode;
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static inline struct fuse_data *
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fuse_get_mpdata(struct mount *mp)
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{
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return mp->mnt_data;
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}
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static inline bool
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fsess_isimpl(struct mount *mp, int opcode)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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return ((data->notimpl & (1ULL << opcode)) == 0);
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}
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static inline void
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fsess_set_notimpl(struct mount *mp, int opcode)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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data->notimpl |= (1ULL << opcode);
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}
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static inline bool
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fsess_opt_datacache(struct mount *mp)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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return (data->cache_mode != FUSE_CACHE_UC);
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}
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static inline bool
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fsess_opt_mmap(struct mount *mp)
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{
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return (fsess_opt_datacache(mp));
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}
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static inline bool
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fsess_opt_writeback(struct mount *mp)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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return (data->cache_mode == FUSE_CACHE_WB);
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}
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/* Insert a new upgoing message */
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static inline void
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fuse_ms_push(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED);
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refcount_acquire(&ftick->tk_refcount);
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STAILQ_INSERT_TAIL(&ftick->tk_data->ms_head, ftick, tk_ms_link);
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ftick->tk_data->ms_count++;
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}
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/* Insert a new upgoing message to the front of the queue */
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static inline void
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fuse_ms_push_head(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_data->ms_mtx, MA_OWNED);
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refcount_acquire(&ftick->tk_refcount);
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STAILQ_INSERT_HEAD(&ftick->tk_data->ms_head, ftick, tk_ms_link);
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ftick->tk_data->ms_count++;
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}
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static inline struct fuse_ticket *
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fuse_ms_pop(struct fuse_data *data)
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{
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struct fuse_ticket *ftick = NULL;
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mtx_assert(&data->ms_mtx, MA_OWNED);
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if ((ftick = STAILQ_FIRST(&data->ms_head))) {
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STAILQ_REMOVE_HEAD(&data->ms_head, tk_ms_link);
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data->ms_count--;
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#ifdef INVARIANTS
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MPASS(data->ms_count >= 0);
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ftick->tk_ms_link.stqe_next = NULL;
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#endif
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}
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return (ftick);
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}
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static inline void
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fuse_aw_push(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED);
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refcount_acquire(&ftick->tk_refcount);
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TAILQ_INSERT_TAIL(&ftick->tk_data->aw_head, ftick, tk_aw_link);
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}
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static inline void
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fuse_aw_remove(struct fuse_ticket *ftick)
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{
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mtx_assert(&ftick->tk_data->aw_mtx, MA_OWNED);
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TAILQ_REMOVE(&ftick->tk_data->aw_head, ftick, tk_aw_link);
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#ifdef INVARIANTS
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ftick->tk_aw_link.tqe_next = NULL;
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ftick->tk_aw_link.tqe_prev = NULL;
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#endif
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}
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static inline struct fuse_ticket *
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fuse_aw_pop(struct fuse_data *data)
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{
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struct fuse_ticket *ftick;
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mtx_assert(&data->aw_mtx, MA_OWNED);
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if ((ftick = TAILQ_FIRST(&data->aw_head)) != NULL)
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fuse_aw_remove(ftick);
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return (ftick);
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}
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struct fuse_ticket *fuse_ticket_fetch(struct fuse_data *data);
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int fuse_ticket_drop(struct fuse_ticket *ftick);
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void fuse_insert_callback(struct fuse_ticket *ftick, fuse_handler_t *handler);
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void fuse_insert_message(struct fuse_ticket *ftick, bool irq);
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static inline bool
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fuse_libabi_geq(struct fuse_data *data, uint32_t abi_maj, uint32_t abi_min)
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{
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return (data->fuse_libabi_major > abi_maj ||
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(data->fuse_libabi_major == abi_maj &&
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data->fuse_libabi_minor >= abi_min));
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}
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struct fuse_data *fdata_alloc(struct cdev *dev, struct ucred *cred);
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void fdata_trydestroy(struct fuse_data *data);
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void fdata_set_dead(struct fuse_data *data);
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static inline bool
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fdata_get_dead(struct fuse_data *data)
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{
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return (data->dataflags & FSESS_DEAD);
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}
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struct fuse_dispatcher {
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struct fuse_ticket *tick;
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struct fuse_in_header *finh;
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void *indata;
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size_t iosize;
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uint64_t nodeid;
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int answ_stat;
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void *answ;
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};
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static inline void
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fdisp_init(struct fuse_dispatcher *fdisp, size_t iosize)
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{
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fdisp->iosize = iosize;
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fdisp->tick = NULL;
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}
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static inline void
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fdisp_destroy(struct fuse_dispatcher *fdisp)
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{
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fuse_ticket_drop(fdisp->tick);
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#ifdef INVARIANTS
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fdisp->tick = NULL;
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#endif
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}
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void fdisp_refresh(struct fuse_dispatcher *fdip);
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void fdisp_make(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct mount *mp, uint64_t nid, struct thread *td, struct ucred *cred);
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void fdisp_make_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct vnode *vp, struct thread *td, struct ucred *cred);
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void fdisp_refresh_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct vnode *vp, struct thread *td, struct ucred *cred);
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int fdisp_wait_answ(struct fuse_dispatcher *fdip);
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static inline int
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fdisp_simple_putget_vp(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct vnode *vp, struct thread *td, struct ucred *cred)
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{
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fdisp_make_vp(fdip, op, vp, td, cred);
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return (fdisp_wait_answ(fdip));
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}
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#endif /* _FUSE_IPC_H_ */
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