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,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 #include <sys/types.h>
45 #include <sys/mount.h>
49 #include "libhammer.h"
52 libhammer_find_pfs_mount(uuid_t
*unique_uuid
)
54 struct hammer_ioc_pseudofs_rw pfs
;
55 struct hammer_pseudofs_data pfsd
;
56 struct statfs
*mntbuf
;
66 /* Do not continue if there are no mounted filesystems */
67 mntsize
= getfsstat(NULL
, 0, MNT_NOWAIT
);
71 mntbufsize
= mntsize
* sizeof(struct statfs
);
72 mntbuf
= _libhammer_malloc(mntbufsize
);
74 mntsize
= getfsstat(mntbuf
, (long)mntbufsize
, MNT_NOWAIT
);
75 curmount
= mntsize
- 1;
78 * Iterate all the mounted points looking for the PFS passed to
81 while(curmount
>= 0) {
82 struct statfs
*mnt
= &mntbuf
[curmount
];
84 * Discard any non null(5) or hammer(5) filesystems as synthetic
85 * filesystems like procfs(5) could accept ioctl calls and thus
86 * produce bogus results.
88 if ((strcmp("hammer", mnt
->f_fstypename
) != 0) &&
89 (strcmp("null", mnt
->f_fstypename
) != 0)) {
93 bzero(&pfs
, sizeof(pfs
));
94 bzero(&pfsd
, sizeof(pfsd
));
97 pfs
.bytes
= sizeof(struct hammer_pseudofs_data
);
98 fd
= open(mnt
->f_mntonname
, O_RDONLY
);
99 if (fd
< 0 || (ioctl(fd
, HAMMERIOC_GET_PSEUDOFS
, &pfs
) < 0)) {
105 memcpy(&uuid
, &pfs
.ondisk
->unique_uuid
, sizeof(uuid
));
106 if (uuid_compare(unique_uuid
, &uuid
, NULL
) == 0) {
107 retval
= strdup(mnt
->f_mntonname
);
121 * Find out the path that can be used to open(2) a PFS
122 * when it is not mounted. It allocates *path so the
123 * caller is in charge of freeing it up.
126 libhammer_pfs_canonical_path(char * mtpt
, libhammer_pfsinfo_t pip
, char **path
)
131 assert(mtpt
!= NULL
);
133 if ((statfs(mtpt
, &st
) < 0) ||
134 ((strcmp("hammer", st
.f_fstypename
) != 0) &&
135 (strcmp("null", st
.f_fstypename
) != 0))) {
141 asprintf(path
, "%s/@@-1:%.5d", mtpt
,
144 asprintf(path
, "%s/@@0x%016jx:%.5d", mtpt
,
145 pip
->end_tid
, pip
->pfs_id
);
150 * Allocate len bytes of memory and return the pointer.
151 * It'll exit in the case no memory could be allocated.
153 * To be used only by the library itself.
156 _libhammer_malloc(size_t len
)
160 m
= calloc(len
, sizeof(char));
162 errx(1, "Failed to allocate %zd bytes", len
);