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fuseprivate.c
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fuseprivate.c
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/*
* Copyright (c) 2014 Dave Vasilevsky <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "fuseprivate.h"
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "nonstd.h"
int sqfs_listxattr(sqfs *fs, sqfs_inode *inode, char *buf, size_t *size) {
sqfs_xattr x;
size_t count = 0;
if (sqfs_xattr_open(fs, inode, &x))
return -EIO;
while (x.remain) {
size_t n;
if (sqfs_xattr_read(&x))
return EIO;
n = sqfs_xattr_name_size(&x);
count += n + 1;
if (buf) {
if (count > *size)
return ERANGE;
if (sqfs_xattr_name(&x, buf, true))
return EIO;
buf += n;
*buf++ = '\0';
}
}
*size = count;
return 0;
}
void sqfs_minimal_fuse_usage() {
fprintf(stderr, "\nSelection of FUSE options:\n");
fprintf(stderr," -h --help print help\n");
fprintf(stderr," -V --version print version\n");
fprintf(stderr," -d -o debug enable debug output (implies -f)\n");
fprintf(stderr," -f foreground operation\n");
}
void sqfs_usage(char *progname, bool fuse_usage, bool ll_usage) {
fprintf(stderr, "%s (c) 2012 Dave Vasilevsky\n\n", PACKAGE_STRING);
fprintf(stderr, "Usage: %s [options] ARCHIVE MOUNTPOINT\n",
progname ? progname : PACKAGE_NAME);
fprintf(stderr, "\n%s options:\n", progname);
fprintf(stderr, " -o offset=N offset N bytes into ARCHIVE to mount\n");
fprintf(stderr, " -o subdir=PATH mount subdirectory PATH of ARCHIVE\n");
if (ll_usage) {
fprintf(stderr, " -o timeout=N idle N seconds for automatic unmount\n");
fprintf(stderr, " -o uid=N set file owner to uid N\n");
fprintf(stderr, " -o gid=N set file group to gid N\n");
}
if (fuse_usage) {
if (ll_usage) {
#ifdef SQFS_MULTITHREADED
#if FUSE_USE_VERSION >= 30
fprintf(stderr, "\nFUSE options:\n");
fuse_cmdline_help();
#else
struct fuse_args args = FUSE_ARGS_INIT(0, NULL);
fuse_opt_add_arg(&args, ""); /* progname */
fuse_opt_add_arg(&args, "-ho");
fprintf(stderr, "\n");
fuse_parse_cmdline(&args, NULL, NULL, NULL);
#endif
#else
/* Skip the multithreaded options */
sqfs_minimal_fuse_usage();
#endif
} else {
/* Standard FUSE help includes confusing
* multi-threaded options so don't use it
*/
sqfs_minimal_fuse_usage();
fprintf(stderr," -o allow_other allow access by other users\n");
fprintf(stderr," -o allow_root allow access by the superuser\n");
}
}
exit(-2);
}
int sqfs_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs) {
sqfs_opts *opts = (sqfs_opts*)data;
if (key == FUSE_OPT_KEY_NONOPT) {
if (opts->mountpoint) {
return -1; /* Too many args */
} else if (opts->image) {
opts->mountpoint = 1;
return 1;
} else {
opts->image = arg;
return 0;
}
} else if (key == FUSE_OPT_KEY_OPT) {
if (strncmp(arg, "-h", 2) == 0 || strncmp(arg, "--h", 3) == 0)
return -1;
}
return 1; /* Keep */
}
int sqfs_statfs(sqfs *sq, struct statvfs *st) {
struct squashfs_super_block *sb = &sq->sb;
st->f_bsize = sb->block_size;
st->f_frsize = sb->block_size;
st->f_blocks = ((sb->bytes_used - 1) >> sb->block_log) + 1;
st->f_bfree = 0;
st->f_bavail = 0;
st->f_files = sb->inodes;
st->f_ffree = 0;
st->f_favail = 0;
st->f_namemax = SQUASHFS_NAME_LEN;
return 0;
}