bc5273fd8f
resides on. Fix the special case of the filesystem fragment size not evenly dividing the size of the provider. Fixing the general case probably requires better superblock validation (left as an exercise to the reader).
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 2002, 2003 Gordon Tetlow
|
|
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <ufs/ufs/dinode.h>
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
#include <geom/geom.h>
|
|
#include <geom/label/g_label.h>
|
|
|
|
#define G_LABEL_UFS_DIR "ufs"
|
|
|
|
static const int superblocks[] = SBLOCKSEARCH;
|
|
|
|
static void
|
|
g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size)
|
|
{
|
|
struct g_provider *pp;
|
|
int error, sb, superblock;
|
|
struct fs *fs;
|
|
|
|
g_topology_assert_not();
|
|
pp = cp->provider;
|
|
label[0] = '\0';
|
|
/*
|
|
* Walk through the standard places that superblocks hide and look
|
|
* for UFS magic. If we find magic, then check that the size in the
|
|
* superblock corresponds to the size of the underlying provider.
|
|
* Finally, look for a volume label and create an appropriate
|
|
* provider based on that.
|
|
*/
|
|
for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
|
|
/*
|
|
* Take care not to issue an invalid I/O request. The
|
|
* offset and size of the superblock candidate must be
|
|
* multiples of the provider's sector size, otherwise an
|
|
* FFS can't exist on the provider anyway.
|
|
*/
|
|
if (superblock % cp->provider->sectorsize != 0 ||
|
|
SBLOCKSIZE % cp->provider->sectorsize != 0)
|
|
continue;
|
|
|
|
fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE,
|
|
&error);
|
|
if (fs == NULL || error != 0)
|
|
continue;
|
|
/* Check for magic and make sure things are the right size */
|
|
if (fs->fs_magic == FS_UFS1_MAGIC) {
|
|
G_LABEL_DEBUG(1, "UFS1 file system detected on %s.",
|
|
pp->name);
|
|
if (fs->fs_old_size * fs->fs_fsize !=
|
|
(int32_t)pp->mediasize) {
|
|
g_free(fs);
|
|
continue;
|
|
}
|
|
} else if (fs->fs_magic == FS_UFS2_MAGIC) {
|
|
G_LABEL_DEBUG(1, "UFS2 file system detected on %s.",
|
|
pp->name);
|
|
if (fs->fs_fsize <= 0 ||
|
|
pp->mediasize / fs->fs_fsize != fs->fs_size) {
|
|
g_free(fs);
|
|
continue;
|
|
}
|
|
} else {
|
|
g_free(fs);
|
|
continue;
|
|
}
|
|
/* Check for volume label */
|
|
if (fs->fs_volname[0] == '\0') {
|
|
g_free(fs);
|
|
continue;
|
|
}
|
|
strlcpy(label, fs->fs_volname, size);
|
|
g_free(fs);
|
|
break;
|
|
}
|
|
}
|
|
|
|
const struct g_label_desc g_label_ufs = {
|
|
.ld_taste = g_label_ufs_taste,
|
|
.ld_dir = G_LABEL_UFS_DIR
|
|
};
|