diff options
Diffstat (limited to 'lib/libufs/sblock.c')
| -rw-r--r-- | lib/libufs/sblock.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/lib/libufs/sblock.c b/lib/libufs/sblock.c new file mode 100644 index 0000000..d6bec3e --- /dev/null +++ b/lib/libufs/sblock.c @@ -0,0 +1,169 @@ +/* + * Copyright (c) 2002 Juli Mallett. All rights reserved. + * + * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the + * FreeBSD project. Redistribution and use in source and binary forms, with + * or without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistribution of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistribution 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 ``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 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/mount.h> +#include <sys/disklabel.h> +#include <sys/stat.h> + +#include <ufs/ufs/ufsmount.h> +#include <ufs/ufs/dinode.h> +#include <ufs/ffs/fs.h> + +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> + +#include <libufs.h> + +static int superblocks[] = SBLOCKSEARCH; + +int +sbread(struct uufsd *disk) +{ + uint8_t block[MAXBSIZE]; + struct fs *fs; + int sb, superblock; + int i, size, blks; + uint8_t *space; + + ERROR(disk, NULL); + + fs = &disk->d_fs; + superblock = superblocks[0]; + + for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { + if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) { + ERROR(disk, "non-existent or truncated superblock"); + return (-1); + } + if (fs->fs_magic == FS_UFS1_MAGIC) + disk->d_ufs = 1; + if (fs->fs_magic == FS_UFS2_MAGIC && + fs->fs_sblockloc == superblock) + disk->d_ufs = 2; + if (fs->fs_bsize <= MAXBSIZE && + (size_t)fs->fs_bsize >= sizeof(*fs)) { + if (disk->d_ufs) + break; + } + disk->d_ufs = 0; + } + if (superblock == -1 || disk->d_ufs == 0) { + /* + * Other error cases will result in errno being set, here we + * must set it to indicate no superblock could be found with + * which to associate this disk/filesystem. + */ + ERROR(disk, "no usable known superblock found"); + errno = ENOENT; + return (-1); + } + disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1); + disk->d_sblock = superblock / disk->d_bsize; + /* + * Read in the superblock summary information. + */ + size = fs->fs_cssize; + blks = howmany(size, fs->fs_fsize); + size += fs->fs_ncg * sizeof(int32_t); + space = malloc(size); + if (space == NULL) { + ERROR(disk, "failed to allocate space for summary information"); + return (-1); + } + fs->fs_csp = (struct csum *)space; + for (i = 0; i < blks; i += fs->fs_frag) { + size = fs->fs_bsize; + if (i + fs->fs_frag > blks) + size = (blks - i) * fs->fs_fsize; + if (bread(disk, fsbtodb(fs, fs->fs_csaddr + i), block, size) + == -1) { + ERROR(disk, "Failed to read sb summary information"); + free(fs->fs_csp); + return (-1); + } + bcopy(block, space, size); + space += size; + } + fs->fs_maxcluster = (uint32_t *)space; + disk->d_sbcsum = fs->fs_csp; + + return (0); +} + +int +sbwrite(struct uufsd *disk, int all) +{ + struct fs *fs; + int blks, size; + uint8_t *space; + unsigned i; + + ERROR(disk, NULL); + + fs = &disk->d_fs; + + if (!disk->d_sblock) { + disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize; + } + + if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) { + ERROR(disk, "failed to write superblock"); + return (-1); + } + /* + * Write superblock summary information. + */ + blks = howmany(fs->fs_cssize, fs->fs_fsize); + space = (uint8_t *)disk->d_sbcsum; + for (i = 0; i < blks; i += fs->fs_frag) { + size = fs->fs_bsize; + if (i + fs->fs_frag > blks) + size = (blks - i) * fs->fs_fsize; + if (bwrite(disk, fsbtodb(fs, fs->fs_csaddr + i), space, size) + == -1) { + ERROR(disk, "Failed to write sb summary information"); + return (-1); + } + space += size; + } + if (all) { + for (i = 0; i < fs->fs_ncg; i++) + if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)), + fs, SBLOCKSIZE) == -1) { + ERROR(disk, "failed to update a superblock"); + return (-1); + } + } + return (0); +} |
