8eecd9ce05
Enable write clustering in fusefs whenever cache mode is set to writeback and the "async" mount option is used. With default values for MAXPHYS, DFLTPHYS, and the fuse max_write mount parameter, that means sequential writes will now be written 128KB at a time instead of 64KB. Also, add a regression test for PR 238565, a panic during unmount that probably affects UFS, ext2, and msdosfs as well as fusefs. PR: 238565 Sponsored by: The FreeBSD Foundation
487 lines
12 KiB
C
487 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Jean-Sebastien Pedron
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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 THE 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 THE 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/uio.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <getopt.h>
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#include <limits.h>
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#include <osreldate.h>
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#include <paths.h>
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#include "mntopts.h"
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#ifndef FUSE4BSD_VERSION
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#define FUSE4BSD_VERSION "0.3.9-pre1"
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#endif
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void __usage_short(void);
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void usage(void);
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void helpmsg(void);
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void showversion(void);
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static struct mntopt mopts[] = {
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#define ALTF_PRIVATE 0x01
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{ "private", 0, ALTF_PRIVATE, 1 },
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{ "neglect_shares", 0, 0x02, 1 },
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{ "push_symlinks_in", 0, 0x04, 1 },
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{ "allow_other", 0, 0x08, 1 },
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{ "default_permissions", 0, 0x10, 1 },
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#define ALTF_MAXREAD 0x20
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{ "max_read=", 0, ALTF_MAXREAD, 1 },
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#define ALTF_SUBTYPE 0x40
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{ "subtype=", 0, ALTF_SUBTYPE, 1 },
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/*
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* MOPT_AUTOMOUNTED, included by MOPT_STDOPTS, does not fit into
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* the 'flags' argument to nmount(2). We have to abuse altflags
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* to pass it, as string, via iovec.
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*/
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#define ALTF_AUTOMOUNTED 0x100
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{ "automounted", 0, ALTF_AUTOMOUNTED, 1 },
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/* Linux specific options, we silently ignore them */
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{ "fsname=", 0, 0x00, 1 },
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{ "fd=", 0, 0x00, 1 },
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{ "rootmode=", 0, 0x00, 1 },
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{ "user_id=", 0, 0x00, 1 },
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{ "group_id=", 0, 0x00, 1 },
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{ "large_read", 0, 0x00, 1 },
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/* "nonempty", just the first two chars are stripped off during parsing */
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{ "nempty", 0, 0x00, 1 },
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{ "async", 0, MNT_ASYNC, 0},
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{ "noasync", 1, MNT_ASYNC, 0},
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MOPT_STDOPTS,
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MOPT_END
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};
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struct mntval {
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int mv_flag;
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void *mv_value;
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int mv_len;
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};
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static struct mntval mvals[] = {
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{ ALTF_MAXREAD, NULL, 0 },
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{ ALTF_SUBTYPE, NULL, 0 },
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{ 0, NULL, 0 }
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};
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#define DEFAULT_MOUNT_FLAGS ALTF_PRIVATE
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int
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main(int argc, char *argv[])
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{
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struct iovec *iov;
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int mntflags, iovlen, verbose = 0;
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char *dev = NULL, *dir = NULL, mntpath[MAXPATHLEN];
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char *devo = NULL, *diro = NULL;
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char ndev[128], fdstr[15];
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int i, done = 0, reject_allow_other = 0, safe_level = 0;
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int altflags = DEFAULT_MOUNT_FLAGS;
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int __altflags = DEFAULT_MOUNT_FLAGS;
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int ch = 0;
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struct mntopt *mo;
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struct mntval *mv;
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static struct option longopts[] = {
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{"reject-allow_other", no_argument, NULL, 'A'},
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{"safe", no_argument, NULL, 'S'},
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{"daemon", required_argument, NULL, 'D'},
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{"daemon_opts", required_argument, NULL, 'O'},
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{"special", required_argument, NULL, 's'},
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{"mountpath", required_argument, NULL, 'm'},
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{"version", no_argument, NULL, 'V'},
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{"help", no_argument, NULL, 'h'},
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{0,0,0,0}
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};
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int pid = 0;
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int fd = -1, fdx;
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char *ep;
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char *daemon_str = NULL, *daemon_opts = NULL;
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/*
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* We want a parsing routine which is not sensitive to
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* the position of args/opts; it should extract the
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* first two args and stop at the beginning of the rest.
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* (This makes it easier to call mount_fusefs from external
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* utils than it is with a strict "util flags args" syntax.)
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*/
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iov = NULL;
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iovlen = 0;
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mntflags = 0;
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/* All in all, I feel it more robust this way... */
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unsetenv("POSIXLY_CORRECT");
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if (getenv("MOUNT_FUSEFS_IGNORE_UNKNOWN"))
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getmnt_silent = 1;
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if (getenv("MOUNT_FUSEFS_VERBOSE"))
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verbose = 1;
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do {
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for (i = 0; i < 3; i++) {
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if (optind < argc && argv[optind][0] != '-') {
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if (dir) {
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done = 1;
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break;
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}
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if (dev)
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dir = argv[optind];
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else
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dev = argv[optind];
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optind++;
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}
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}
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switch(ch) {
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case 'A':
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reject_allow_other = 1;
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break;
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case 'S':
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safe_level = 1;
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break;
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case 'D':
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if (daemon_str)
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errx(1, "daemon specified inconsistently");
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daemon_str = optarg;
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break;
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case 'O':
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if (daemon_opts)
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errx(1, "daemon opts specified inconsistently");
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daemon_opts = optarg;
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break;
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case 'o':
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getmntopts(optarg, mopts, &mntflags, &altflags);
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for (mv = mvals; mv->mv_flag; ++mv) {
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if (! (altflags & mv->mv_flag))
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continue;
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for (mo = mopts; mo->m_flag; ++mo) {
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char *p, *q;
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if (mo->m_flag != mv->mv_flag)
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continue;
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p = strstr(optarg, mo->m_option);
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if (p) {
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p += strlen(mo->m_option);
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q = p;
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while (*q != '\0' && *q != ',')
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q++;
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mv->mv_len = q - p + 1;
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mv->mv_value = malloc(mv->mv_len);
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memcpy(mv->mv_value, p, mv->mv_len - 1);
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((char *)mv->mv_value)[mv->mv_len - 1] = '\0';
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break;
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}
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}
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}
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break;
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case 's':
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if (devo)
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errx(1, "special specified inconsistently");
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devo = optarg;
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break;
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case 'm':
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if (diro)
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errx(1, "mount path specified inconsistently");
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diro = optarg;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'h':
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helpmsg();
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break;
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case 'V':
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showversion();
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break;
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case '\0':
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break;
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case '?':
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default:
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usage();
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}
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if (done)
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break;
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} while ((ch = getopt_long(argc, argv, "AvVho:SD:O:s:m:", longopts, NULL)) != -1);
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argc -= optind;
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argv += optind;
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if (devo) {
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if (dev)
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errx(1, "special specified inconsistently");
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dev = devo;
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} else if (diro)
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errx(1, "if mountpoint is given via an option, special should also be given via an option");
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if (diro) {
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if (dir)
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errx(1, "mount path specified inconsistently");
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dir = diro;
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}
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if ((! dev) && argc > 0) {
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dev = *argv++;
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argc--;
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}
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if ((! dir) && argc > 0) {
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dir = *argv++;
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argc--;
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}
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if (! (dev && dir))
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errx(1, "missing special and/or mountpoint");
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for (mo = mopts; mo->m_flag; ++mo) {
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if (altflags & mo->m_flag) {
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int iov_done = 0;
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if (reject_allow_other &&
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strcmp(mo->m_option, "allow_other") == 0)
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/*
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* reject_allow_other is stronger than a
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* negative of allow_other: if this is set,
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* allow_other is blocked, period.
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*/
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errx(1, "\"allow_other\" usage is banned by respective option");
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for (mv = mvals; mv->mv_flag; ++mv) {
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if (mo->m_flag != mv->mv_flag)
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continue;
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if (mv->mv_value) {
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build_iovec(&iov, &iovlen, mo->m_option, mv->mv_value, mv->mv_len);
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iov_done = 1;
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break;
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}
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}
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if (! iov_done)
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build_iovec(&iov, &iovlen, mo->m_option,
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__DECONST(void *, ""), -1);
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}
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if (__altflags & mo->m_flag) {
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char *uscore_opt;
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if (asprintf(&uscore_opt, "__%s", mo->m_option) == -1)
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err(1, "failed to allocate memory");
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build_iovec(&iov, &iovlen, uscore_opt,
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__DECONST(void *, ""), -1);
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free(uscore_opt);
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}
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}
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if (getenv("MOUNT_FUSEFS_SAFE"))
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safe_level = 1;
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if (safe_level > 0 && (argc > 0 || daemon_str || daemon_opts))
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errx(1, "safe mode, spawning daemon not allowed");
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if ((argc > 0 && (daemon_str || daemon_opts)) ||
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(daemon_opts && ! daemon_str))
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errx(1, "daemon specified inconsistently");
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/*
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* Resolve the mountpoint with realpath(3) and remove unnecessary
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* slashes from the devicename if there are any.
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*/
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if (checkpath(dir, mntpath) != 0)
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err(1, "%s", mntpath);
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(void)rmslashes(dev, dev);
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if (strcmp(dev, "auto") == 0)
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dev = __DECONST(char *, "/dev/fuse");
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if (strcmp(dev, "/dev/fuse") == 0) {
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if (! (argc > 0 || daemon_str)) {
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fprintf(stderr, "Please also specify the fuse daemon to run when mounting via the multiplexer!\n");
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usage();
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}
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if ((fd = open(dev, O_RDWR)) < 0)
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err(1, "failed to open fuse device");
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} else {
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fdx = strtol(dev, &ep, 10);
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if (*ep == '\0')
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fd = fdx;
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}
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/* Identifying device */
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if (fd >= 0) {
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struct stat sbuf;
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char *ndevbas, *lep;
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if (fstat(fd, &sbuf) == -1)
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err(1, "cannot stat device file descriptor");
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strcpy(ndev, _PATH_DEV);
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ndevbas = ndev + strlen(_PATH_DEV);
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devname_r(sbuf.st_rdev, S_IFCHR, ndevbas,
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sizeof(ndev) - strlen(_PATH_DEV));
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if (strncmp(ndevbas, "fuse", 4))
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errx(1, "mounting inappropriate device");
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strtol(ndevbas + 4, &lep, 10);
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if (*lep != '\0')
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errx(1, "mounting inappropriate device");
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dev = ndev;
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}
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if (argc > 0 || daemon_str) {
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char *fds;
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if (fd < 0 && (fd = open(dev, O_RDWR)) < 0)
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err(1, "failed to open fuse device");
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if (asprintf(&fds, "%d", fd) == -1)
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err(1, "failed to allocate memory");
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setenv("FUSE_DEV_FD", fds, 1);
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free(fds);
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setenv("FUSE_NO_MOUNT", "1", 1);
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if (daemon_str) {
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char *bgdaemon;
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int len;
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if (! daemon_opts)
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daemon_opts = __DECONST(char *, "");
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len = strlen(daemon_str) + 1 + strlen(daemon_opts) +
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2 + 1;
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bgdaemon = calloc(1, len);
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if (! bgdaemon)
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err(1, "failed to allocate memory");
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strlcpy(bgdaemon, daemon_str, len);
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strlcat(bgdaemon, " ", len);
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strlcat(bgdaemon, daemon_opts, len);
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strlcat(bgdaemon, " &", len);
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if (system(bgdaemon))
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err(1, "failed to call fuse daemon");
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} else {
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if ((pid = fork()) < 0)
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err(1, "failed to fork for fuse daemon");
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if (pid == 0) {
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execvp(argv[0], argv);
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err(1, "failed to exec fuse daemon");
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}
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}
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}
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/* Prepare the options vector for nmount(). build_iovec() is declared
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* in mntopts.h. */
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sprintf(fdstr, "%d", fd);
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build_iovec(&iov, &iovlen, "fstype", __DECONST(void *, "fusefs"), -1);
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build_iovec(&iov, &iovlen, "fspath", mntpath, -1);
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build_iovec(&iov, &iovlen, "from", dev, -1);
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build_iovec(&iov, &iovlen, "fd", fdstr, -1);
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if (verbose)
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fprintf(stderr, "mounting fuse daemon on device %s\n", dev);
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if (nmount(iov, iovlen, mntflags) < 0)
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err(EX_OSERR, "%s on %s", dev, mntpath);
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exit(0);
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}
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void
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__usage_short(void) {
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fprintf(stderr,
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"usage:\n%s [-A|-S|-v|-V|-h|-D daemon|-O args|-s special|-m node|-o option...] special node [daemon args...]\n\n",
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getprogname());
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}
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void
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usage(void)
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{
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struct mntopt *mo;
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__usage_short();
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fprintf(stderr, "known options:\n");
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for (mo = mopts; mo->m_flag; ++mo)
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fprintf(stderr, "\t%s\n", mo->m_option);
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fprintf(stderr, "\n(use -h for a detailed description of these options)\n");
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exit(EX_USAGE);
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}
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void
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helpmsg(void)
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{
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if (! getenv("MOUNT_FUSEFS_CALL_BY_LIB")) {
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__usage_short();
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fprintf(stderr, "description of options:\n");
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}
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/*
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* The main use case of this function is giving info embedded in general
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* FUSE lib help output. Therefore the style and the content of the output
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* tries to fit there as much as possible.
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*/
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fprintf(stderr,
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" -o allow_other allow access to other users\n"
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/* " -o nonempty allow mounts over non-empty file/dir\n" */
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" -o default_permissions enable permission checking by kernel\n"
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/*
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" -o fsname=NAME set filesystem name\n"
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" -o large_read issue large read requests (2.4 only)\n"
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*/
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" -o subtype=NAME set filesystem type\n"
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" -o max_read=N set maximum size of read requests\n"
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" -o noprivate allow secondary mounting of the filesystem\n"
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" -o neglect_shares don't report EBUSY when unmount attempted\n"
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" in presence of secondary mounts\n"
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" -o push_symlinks_in prefix absolute symlinks with mountpoint\n"
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);
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exit(EX_USAGE);
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}
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void
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showversion(void)
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{
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puts("mount_fusefs [fuse4bsd] version: " FUSE4BSD_VERSION);
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exit(EX_USAGE);
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}
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