diff options
| -rw-r--r-- | sys/geom/geom_vol_ffs.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/sys/geom/geom_vol_ffs.c b/sys/geom/geom_vol_ffs.c new file mode 100644 index 000000000000..7c9a114358ef --- /dev/null +++ b/sys/geom/geom_vol_ffs.c @@ -0,0 +1,146 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/errno.h> +#ifndef _KERNEL +#include <stdio.h> +#include <string.h> +#include <signal.h> +#include <sys/param.h> +#include <stdlib.h> +#include <err.h> +#else +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/bio.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#endif + +#include <ufs/ufs/dinode.h> +#include <ufs/ffs/fs.h> + +#include <geom/geom.h> +#include <geom/geom_slice.h> + +#define VOL_FFS_CLASS_NAME "VOL_FFS" + +static int superblocks[] = SBLOCKSEARCH; + +struct g_vol_ffs_softc { + char * vol; +}; + +static int +g_vol_ffs_start(struct bio *bp __unused) +{ + return(0); +} + +static struct g_geom * +g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags) +{ + struct g_geom *gp; + struct g_consumer *cp; + struct g_vol_ffs_softc *ms; + int error, sb, superblock; + struct fs *fs; + + g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name); + g_topology_assert(); + + if (flags == G_TF_NORMAL && + !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME)) + return (NULL); + + gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start); + if (gp == NULL) + return (NULL); + g_topology_unlock(); + /* + * 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 /dev + * entry based on that. + */ + for (sb=0; (superblock = superblocks[sb]) != -1; sb++) { + 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) { + if (fs->fs_old_size * fs->fs_fsize != + (int32_t) pp->mediasize) { + g_free(fs); + continue; + } + } else if (fs->fs_magic == FS_UFS2_MAGIC) { + if (fs->fs_size * fs->fs_fsize != + (int64_t) pp->mediasize) { + g_free(fs); + continue; + } + } else { + g_free(fs); + continue; + } + /* Check for volume label */ + if (fs->fs_volname[0] == '\0') { + g_free(fs); + continue; + } + g_topology_lock(); + /* Alright, we have a label and a volume name, reconfig. */ + g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0, + pp->mediasize, pp->sectorsize, "vol/%s", + fs->fs_volname); + g_free(fs); + g_topology_unlock(); + break; + } + g_topology_lock(); + g_access_rel(cp, -1, 0, 0); + if (LIST_EMPTY(&gp->provider)) { + g_std_spoiled(cp); + return (NULL); + } + return (gp); +} + +static struct g_class g_vol_ffs_class = { + VOL_FFS_CLASS_NAME, + g_vol_ffs_taste, + NULL, + G_CLASS_INITIALIZER +}; + +DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs); |