155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/*-
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* Copyright (c) 2002, 2003 Gordon Tetlow
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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 AUTHOR 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 AUTHOR 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/errno.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 <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.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/geom_slice.h>
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#define VOL_FFS_CLASS_NAME "VOL_FFS"
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static int superblocks[] = SBLOCKSEARCH;
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struct g_vol_ffs_softc {
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char * vol;
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};
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static int
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g_vol_ffs_start(struct bio *bp __unused)
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{
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return(0);
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}
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static struct g_geom *
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g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_vol_ffs_softc *ms;
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int sb, superblock;
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struct fs *fs;
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g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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/*
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* XXX This is a really weak way to make sure we don't recurse.
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* Probably ought to use BIO_GETATTR to check for this.
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*/
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if (flags == G_TF_NORMAL &&
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!strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
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return (NULL);
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gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
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if (gp == NULL)
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return (NULL);
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g_topology_unlock();
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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
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* offset and size of the superblock candidate must be
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* multiples of the provider's sector size, otherwise an
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* FFS can't exist on the provider anyway.
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*/
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if (superblock % cp->provider->sectorsize != 0 ||
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SBLOCKSIZE % cp->provider->sectorsize != 0)
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continue;
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fs = (struct fs *) g_read_data(cp, superblock,
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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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if (fs->fs_old_size * fs->fs_fsize !=
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(int32_t) pp->mediasize) {
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g_free(fs);
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continue;
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}
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} else if (fs->fs_magic == FS_UFS2_MAGIC) {
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if (fs->fs_size * fs->fs_fsize !=
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(int64_t) pp->mediasize) {
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g_free(fs);
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continue;
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}
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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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/* 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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/* XXX We need to check for namespace conflicts. */
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/* XXX How do you handle a mirror set? */
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/* XXX We don't validate the volume name. */
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g_topology_lock();
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/* Alright, we have a label and a volume name, reconfig. */
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g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
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pp->mediasize, pp->sectorsize, "vol/%s",
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fs->fs_volname);
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g_free(fs);
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g_topology_unlock();
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break;
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}
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g_topology_lock();
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g_access(cp, -1, 0, 0);
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if (LIST_EMPTY(&gp->provider)) {
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g_slice_spoiled(cp);
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return (NULL);
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}
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return (gp);
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}
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static struct g_class g_vol_ffs_class = {
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.name = VOL_FFS_CLASS_NAME,
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.version = G_VERSION,
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.taste = g_vol_ffs_taste,
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};
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DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);
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