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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 && fs->fs_fsize > 0 &&
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pp->mediasize / fs->fs_fsize == fs->fs_old_size) {
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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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