e1237b285b
This class is used for detecting volume labels on file systems: UFS, MSDOSFS (FAT12, FAT16, FAT32) and ISO9660. It also provide native labelization (there is no need for file system). g_label_ufs.c is based on geom_vol_ffs from Gordon Tetlow. g_label_msdos.c and g_label_iso9660.c are probably hacks, I just found where volume labels are stored and I use those offsets here, but with this class it should be easy to do it as it should be done by someone who know how. Implementing volume labels detection for other file systems also should be trivial. New providers are created in those directories: /dev/ufs/ (UFS1, UFS2) /dev/msdosfs/ (FAT12, FAT16, FAT32) /dev/iso9660/ (ISO9660) /dev/label/ (native labels, configured with glabel(8)) Manual page cleanups and some comments inside were submitted by Simon L. Nielsen, who was, as always, very helpful. Thanks!
103 lines
3.1 KiB
C
103 lines
3.1 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/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 error, 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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/*
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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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fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE,
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&error);
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if (fs == NULL || error != 0)
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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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G_LABEL_DEBUG(1, "UFS1 file system detected on %s.",
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pp->name);
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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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G_LABEL_DEBUG(1, "UFS2 file system detected on %s.",
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pp->name);
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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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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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