51369649b0
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
426 lines
13 KiB
C
426 lines
13 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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* 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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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) \
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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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/* 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__
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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__
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int
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fticket_answered(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "-> ftick=%p\n", ftick);
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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__
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void
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fticket_set_answered(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "-> ftick=%p\n", ftick);
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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__
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enum fuse_opcode
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fticket_opcode(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "-> ftick=%p\n", ftick);
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return (((struct fuse_in_header *)(ftick->tk_ms_fiov.base))->opcode);
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}
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int fticket_pull(struct fuse_ticket *ftick, struct uio *uio);
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enum mountpri { FM_NOMOUNTED, FM_PRIMARY, FM_SECONDARY };
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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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struct mtx aw_mtx;
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TAILQ_HEAD(, fuse_ticket) aw_head;
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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_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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uint64_t notimpl;
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};
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#define FSESS_DEAD 0x0001 /* session is to be closed */
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#define FSESS_UNUSED0 0x0002 /* unused */
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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_NO_ATTRCACHE 0x0080 /* no attribute caching */
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#define FSESS_NO_READAHEAD 0x0100 /* no readaheads */
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#define FSESS_NO_DATACACHE 0x0200 /* disable buffer cache */
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#define FSESS_NO_NAMECACHE 0x0400 /* disable name cache */
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#define FSESS_NO_MMAP 0x0800 /* disable mmap */
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#define FSESS_BROKENIO 0x1000 /* fix broken io */
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extern int fuse_data_cache_enable;
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extern int fuse_data_cache_invalidate;
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extern int fuse_mmap_enable;
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extern int fuse_sync_resize;
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extern int fuse_fix_broken_io;
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static __inline__
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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 int
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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 int
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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 (fuse_data_cache_enable ||
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(data->dataflags & FSESS_NO_DATACACHE) == 0);
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}
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static __inline int
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fsess_opt_mmap(struct mount *mp)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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if (!(fuse_mmap_enable && fuse_data_cache_enable))
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return 0;
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return ((data->dataflags & (FSESS_NO_DATACACHE | FSESS_NO_MMAP)) == 0);
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}
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static __inline int
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fsess_opt_brokenio(struct mount *mp)
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{
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struct fuse_data *data = fuse_get_mpdata(mp);
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return (fuse_fix_broken_io || (data->dataflags & FSESS_BROKENIO));
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}
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static __inline__
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void
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fuse_ms_push(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "ftick=%p refcount=%d\n",
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ftick, ftick->tk_refcount + 1);
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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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}
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static __inline__
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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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#ifdef INVARIANTS
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ftick->tk_ms_link.stqe_next = NULL;
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#endif
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}
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DEBUGX(FUSE_DEBUG_IPC, "ftick=%p refcount=%d\n",
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ftick, ftick ? ftick->tk_refcount : -1);
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return ftick;
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}
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static __inline__
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void
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fuse_aw_push(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "ftick=%p refcount=%d\n",
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ftick, ftick->tk_refcount + 1);
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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__
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void
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fuse_aw_remove(struct fuse_ticket *ftick)
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{
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DEBUGX(FUSE_DEBUG_IPC, "ftick=%p refcount=%d\n",
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ftick, ftick->tk_refcount);
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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__
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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 = NULL;
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mtx_assert(&data->aw_mtx, MA_OWNED);
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if ((ftick = TAILQ_FIRST(&data->aw_head))) {
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fuse_aw_remove(ftick);
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}
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DEBUGX(FUSE_DEBUG_IPC, "ftick=%p refcount=%d\n",
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ftick, ftick ? ftick->tk_refcount : -1);
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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);
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static __inline__
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int
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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 && 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__
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int
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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__
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void
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fdisp_init(struct fuse_dispatcher *fdisp, size_t iosize)
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{
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DEBUGX(FUSE_DEBUG_IPC, "-> fdisp=%p, iosize=%zx\n", fdisp, iosize);
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fdisp->iosize = iosize;
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fdisp->tick = NULL;
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}
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static __inline__
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void
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fdisp_destroy(struct fuse_dispatcher *fdisp)
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{
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DEBUGX(FUSE_DEBUG_IPC, "-> fdisp=%p, ftick=%p\n", fdisp, fdisp->tick);
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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_make(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct mount *mp, uint64_t nid, struct thread *td,
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struct ucred *cred);
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void fdisp_make_pid(struct fuse_dispatcher *fdip, enum fuse_opcode op,
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struct mount *mp, uint64_t nid, pid_t pid,
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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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int fdisp_wait_answ(struct fuse_dispatcher *fdip);
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static __inline__
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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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DEBUGX(FUSE_DEBUG_IPC, "-> fdip=%p, opcode=%d, vp=%p\n", fdip, op, vp);
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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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