build - Fix modifying operation to /usr/obj during installworld.
[dragonfly.git] / lib / libfsid / hammer.c
blob2eedf47839fd701f7945da03c94ea324926ffabc
1 /*
2 * Copyright (c) 2010 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
35 #include "libfsid.h"
37 #include <vfs/hammer/hammer_disk.h>
39 static char buffer[HAMMER_BUFSIZE];
41 fsid_t
42 hammer_probe(const char *dev)
44 static struct hammer_volume_ondisk *fs;
46 if (fsid_dev_read(dev, 0L, sizeof(buffer), buffer) != 0)
47 return FSID_UNKNOWN;
49 fs = (struct hammer_volume_ondisk *)&buffer;
51 if (fs->vol_signature != HAMMER_FSBUF_VOLUME)
52 return FSID_UNKNOWN;
54 return FSID_HAMMER;
57 char *
58 hammer_volname(const char *dev)
60 static struct hammer_volume_ondisk *fs;
62 if (fsid_dev_read(dev, 0L, sizeof(buffer), buffer) != 0)
63 return NULL;
65 fs = (struct hammer_volume_ondisk *)&buffer;
67 if (fs->vol_signature != HAMMER_FSBUF_VOLUME ||
68 fs->vol_label[0] == '\0')
69 return NULL;
71 fs->vol_label[sizeof(fs->vol_label) - 1] = '\0';
73 return fs->vol_label;