2 * Copyright (c) 2011 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 * by Antonio Huete <tuxillo@quantumachine.net>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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41 #include <sys/mount.h>
46 #include "libhammer.h"
49 libhammer_find_pfs_mount(uuid_t *unique_uuid)
51 struct hammer_ioc_pseudofs_rw pfs;
52 struct hammer_pseudofs_data pfsd;
53 struct statfs *mntbuf;
63 /* Do not continue if there are no mounted filesystems */
64 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
68 mntbufsize = mntsize * sizeof(struct statfs);
69 mntbuf = _libhammer_malloc(mntbufsize);
71 mntsize = getfsstat(mntbuf, (long)mntbufsize, MNT_NOWAIT);
72 curmount = mntsize - 1;
75 * Iterate all the mounted points looking for the PFS passed to
78 while(curmount >= 0) {
79 struct statfs *mnt = &mntbuf[curmount];
81 * Discard any non null(5) or hammer(5) filesystems as synthetic
82 * filesystems like procfs(5) could accept ioctl calls and thus
83 * produce bogus results.
85 if ((strcmp("hammer", mnt->f_fstypename) != 0) &&
86 (strcmp("null", mnt->f_fstypename) != 0)) {
90 bzero(&pfs, sizeof(pfs));
91 bzero(&pfsd, sizeof(pfsd));
94 pfs.bytes = sizeof(struct hammer_pseudofs_data);
95 fd = open(mnt->f_mntonname, O_RDONLY);
96 if (fd < 0 || (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0)) {
102 memcpy(&uuid, &pfs.ondisk->unique_uuid, sizeof(uuid));
103 if (uuid_compare(unique_uuid, &uuid, NULL) == 0) {
104 retval = strdup(mnt->f_mntonname);
118 * Allocate len bytes of memory and return the pointer.
119 * It'll exit in the case no memory could be allocated.
121 * To be used only by the library itself.
124 _libhammer_malloc(size_t len)
128 m = calloc(len, sizeof(char));
130 errx(1, "Failed to allocate %zd bytes", len);