99c889fc7d
sysinstall(8) still bogusly puts first partition at offset 0 instead of 16, so glabel/ufs will find file system on slice instead of partition. Before sysinstall is fixed, we must keep this code, which means that we wont't be able to detect UFS file systems created with 'newfs -s ...'. PS. bsdlabel(8) creates partitions properly. MFC after: 3 days
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*-
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* Copyright (c) 2002, 2003 Gordon Tetlow
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* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <geom/geom.h>
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#include <geom/label/g_label.h>
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#define G_LABEL_UFS_DIR "ufs"
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static const int superblocks[] = SBLOCKSEARCH;
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static void
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g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size)
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{
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struct g_provider *pp;
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int sb, superblock;
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struct fs *fs;
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g_topology_assert_not();
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pp = cp->provider;
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label[0] = '\0';
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if (SBLOCKSIZE % cp->provider->sectorsize != 0)
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return;
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/*
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* Walk through the standard places that superblocks hide and look
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* for UFS magic. If we find magic, then check that the size in the
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* superblock corresponds to the size of the underlying provider.
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* Finally, look for a volume label and create an appropriate
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* provider based on that.
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*/
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for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
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/*
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* Take care not to issue an invalid I/O request. The offset of
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* the superblock candidate must be multiples of the provider's
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* sector size, otherwise an FFS can't exist on the provider
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* anyway.
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*/
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if (superblock % cp->provider->sectorsize != 0)
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continue;
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fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, NULL);
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if (fs == NULL)
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continue;
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/* Check for magic and make sure things are the right size */
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if (fs->fs_magic == FS_UFS1_MAGIC &&
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fs->fs_old_size * fs->fs_fsize == (int32_t)pp->mediasize) {
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/* Valid UFS1. */
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} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
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pp->mediasize / fs->fs_fsize == fs->fs_size) {
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/* Valid UFS2. */
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} else {
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g_free(fs);
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continue;
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}
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if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 ||
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fs->fs_bsize < MINBSIZE ||
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fs->fs_bsize < sizeof(struct fs)) {
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g_free(fs);
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continue;
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}
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G_LABEL_DEBUG(1, "%s file system detected on %s.",
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fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
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/* Check for volume label */
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if (fs->fs_volname[0] == '\0') {
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g_free(fs);
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continue;
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}
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strlcpy(label, fs->fs_volname, size);
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g_free(fs);
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break;
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}
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}
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const struct g_label_desc g_label_ufs = {
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.ld_taste = g_label_ufs_taste,
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.ld_dir = G_LABEL_UFS_DIR
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};
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