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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43 #include <sys/types.h>
45 #include <sys/mount.h>
50 #include "libhammer.h"
53 libhammer_find_pfs_mount(uuid_t *unique_uuid)
55 struct hammer_ioc_pseudofs_rw pfs;
56 struct hammer_pseudofs_data pfsd;
57 struct statfs *mntbuf;
67 /* Do not continue if there are no mounted filesystems */
68 mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
72 mntbufsize = mntsize * sizeof(struct statfs);
73 mntbuf = _libhammer_malloc(mntbufsize);
75 mntsize = getfsstat(mntbuf, (long)mntbufsize, MNT_NOWAIT);
76 curmount = mntsize - 1;
79 * Iterate all the mounted points looking for the PFS passed to
82 while(curmount >= 0) {
83 struct statfs *mnt = &mntbuf[curmount];
85 * Discard any non null(5) or hammer(5) filesystems as synthetic
86 * filesystems like procfs(5) could accept ioctl calls and thus
87 * produce bogus results.
89 if ((strcmp("hammer", mnt->f_fstypename) != 0) &&
90 (strcmp("null", mnt->f_fstypename) != 0)) {
94 bzero(&pfs, sizeof(pfs));
95 bzero(&pfsd, sizeof(pfsd));
98 pfs.bytes = sizeof(struct hammer_pseudofs_data);
99 fd = open(mnt->f_mntonname, O_RDONLY);
100 if (fd < 0 || (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0)) {
106 memcpy(&uuid, &pfs.ondisk->unique_uuid, sizeof(uuid));
107 if (uuid_compare(unique_uuid, &uuid, NULL) == 0) {
108 retval = strdup(mnt->f_mntonname);
122 * Find out the path that can be used to open(2) a PFS
123 * when it is not mounted. It allocates *path so the
124 * caller is in charge of freeing it up.
127 libhammer_pfs_canonical_path(char * mtpt, libhammer_pfsinfo_t pip, char **path)
132 assert(mtpt != NULL);
134 if ((statfs(mtpt, &st) < 0) ||
135 ((strcmp("hammer", st.f_fstypename) != 0) &&
136 (strcmp("null", st.f_fstypename) != 0))) {
142 asprintf(path, "%s/@@-1:%.5d", mtpt,
145 asprintf(path, "%s/@@0x%016jx:%.5d", mtpt,
146 pip->end_tid, pip->pfs_id);
151 * Allocate len bytes of memory and return the pointer.
152 * It'll exit in the case no memory could be allocated.
154 * To be used only by the library itself.
157 _libhammer_malloc(size_t len)
161 m = calloc(len, sizeof(char));
163 errx(1, "Failed to allocate %zd bytes", len);