[U-Boot] [PATCH]: FFS/UFS filesystems support
Stanislav Sedov
stas at FreeBSD.org
Mon Nov 3 13:54:48 CET 2008
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Sun, 02 Nov 2008 16:30:57 +0100
Wolfgang Denk <wd at denx.de> mentioned:
>
> Please send plain text, no fancy MIME multipart stuff.
>
Ok, I was not aware of this policy.
There's a new version of the patch. I've also changed the
license to GPL where possible.
Thanks!
Signed-off-by: Stanislav Sedov <stas at FreeBSD.org>
diff -r 83d0dd6dceee Makefile
- --- a/Makefile Mon Nov 03 10:32:53 2008 +0300
+++ b/Makefile Mon Nov 03 15:49:29 2008 +0300
@@ -214,8 +214,9 @@
LIBS += cpu/ixp/npe/libnpe.a
endif
LIBS += lib_$(ARCH)/lib$(ARCH).a
- -LIBS += fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a \
- - fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a
+LIBS += fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/ffs/libffs.a \
+ fs/jffs2/libjffs2.a fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a \
+ fs/yaffs2/libyaffs2.a
LIBS += net/libnet.a
LIBS += disk/libdisk.a
LIBS += drivers/bios_emulator/libatibiosemu.a
diff -r 83d0dd6dceee common/Makefile
- --- a/common/Makefile Mon Nov 03 10:32:53 2008 +0300
+++ b/common/Makefile Mon Nov 03 15:49:29 2008 +0300
@@ -88,6 +88,7 @@
COBJS-$(CONFIG_CMD_FDC)$(CONFIG_CMD_FDOS) += cmd_fdc.o
COBJS-$(CONFIG_OF_LIBFDT) += cmd_fdt.o fdt_support.o
COBJS-$(CONFIG_CMD_FDOS) += cmd_fdos.o
+COBJS-$(CONFIG_CMD_FFS) += cmd_ffs.o
COBJS-$(CONFIG_CMD_FLASH) += cmd_flash.o
ifdef CONFIG_FPGA
COBJS-y += fpga.o
diff -r 83d0dd6dceee common/cmd_ffs.c
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/common/cmd_ffs.c Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,212 @@
+/*-
+ * Copyright (c) 2008 Deglitch Networks http://www.deglitch.com/
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * FFS/UFS filesystem driver.
+ * Author: Stanislav Sedov <stas at FreeBSD.org>
+ */
+#include <common.h>
+#include <part.h>
+#include <config.h>
+#include <command.h>
+#include <image.h>
+#include <asm/byteorder.h>
+#include <ffs.h>
+#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
+#include <usb.h>
+#endif
+
+#if !defined(CONFIG_DOS_PARTITION) && !defined(CONFIG_EFI_PARTITION)
+#error DOS or EFI partition support must be selected
+#endif
+
+int
+ffs_parse_device_spec(char *iface, const char *str,
+ block_dev_desc_t **desc, long *dev, long *part)
+{
+ char *ep, *p;
+
+ *dev = simple_strtoul(str, &ep, 16);
+ if ((*ep != '\0' && *ep != ':') || *str == '\0') {
+ printf("Error: invalid device number: %s\n", str);
+ return (1);
+ }
+
+ *desc = get_dev(iface, *dev);
+ if (*desc == NULL) {
+ printf("Error: block device %ld on %s is not supported\n",
+ *dev, iface);
+ return (1);
+ }
+
+ if (*ep) {
+ p = ++ep;
+ *part = simple_strtoul(p, &ep, 16);
+ if (p == '\0' || *ep != '\0') {
+ printf("Error: invalid partition number %s\n", p);
+ return (1);
+ }
+ } else {
+ *part = 0; /* Whole disk. */
+ }
+ return (0);
+}
+
+int
+do_ffs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ char *filename;
+ long dev, part;
+ block_dev_desc_t *dev_desc;
+ int error;
+
+ if (argc < 3) {
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return (1);
+ }
+
+ error = ffs_parse_device_spec(argv[1], argv[2], &dev_desc, &dev, &part);
+ if (error != 0)
+ return (error);
+
+ filename = argc == 4 ? argv[3] : "/";
+ error = ffs_probe(dev_desc, part);
+ if (error != 0) {
+ printf("Error: could not mount %ld dev %ld part on %s: %d\n",
+ dev, part, argv[1], error);
+ return (1);
+ }
+
+ error = ffs_ls(dev_desc, part, filename);
+ if (error != 0) {
+ printf("Error: ffs_ls: %d\n", error);
+ return (1);
+ }
+ return (0);
+}
+
+int
+do_ffs_load(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ char *filename;
+ long dev, part;
+ unsigned long addr, length;
+ block_dev_desc_t *dev_desc;
+ char buf[12];
+ unsigned long count;
+ char *str, *ep;
+ int error;
+
+ if (argc >= 4) { /* loadaddr is given. */
+ addr = simple_strtoul(argv[3], &ep, 16);
+ if (*ep != '\0' || *argv[3] == '\0') {
+ printf("Error: invalid load address: %s\n", argv[3]);
+ return (1);
+ }
+ } else {
+ str = getenv("loadaddr");
+ if (str != NULL) {
+ addr = simple_strtoul(str, &ep, 16);
+ if (*ep != '\0' || *argv[3] == '\0') {
+ printf("Error: invalid load address: %s\n",
+ argv[3]);
+ return (1);
+ }
+ } else {
+ addr = CONFIG_SYS_LOAD_ADDR;
+ }
+ }
+
+ if (argc >= 5) /* filename is given. */
+ filename = argv[4];
+ else
+ filename = getenv("bootfile");
+ if (filename == NULL || filename == '\0') {
+ printf("Error: no filename to load\n");
+ return (1);
+ }
+
+ if (argc == 6) { /* count is given. */
+ count = simple_strtoul(argv[5], &ep, 16);
+ if (*ep != '\0' || *argv[5] == '\0') {
+ printf("Error: invalid count specification: %s\n",
+ argv[5]);
+ return (1);
+ }
+ } else {
+ count = 0;
+ }
+
+ if (argc < 3 || argc > 6) { /* Catch up on errors. */
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return (1);
+ }
+
+ error = ffs_parse_device_spec(argv[1], argv[2], &dev_desc, &dev, &part);
+ if (error != 0)
+ return (error);
+
+ error = ffs_probe(dev_desc, part);
+ if (error != 0) {
+ printf("Error: could not mount %ld dev %ld part on %s: %d\n",
+ dev, part, argv[1], error);
+ return (1);
+ }
+
+ error = ffs_getfilelength(dev_desc, part, filename, &length);
+ if (error != 0) {
+ printf("Error: file not found: %s\n", filename);
+ return (1);
+ }
+ if ((count < length) && (count != 0))
+ length = count;
+
+ error = ffs_read(dev_desc, part, filename, (char *)addr, length);
+ if (error != 0) {
+ printf("Error reading %ld bytes from %s", length, filename);
+ return (1);
+ }
+
+ load_addr = addr; /* Update load address. */
+ sprintf(buf, "%lX", length);
+ setenv("filesize", buf); /* Update filesize. */
+
+ return (length);
+}
+
+
+/*
+ * U-boot drop-in's.
+ */
+
+U_BOOT_CMD(
+ ffsls, 4, 1, do_ffs_ls,
+ "ffsls - list files in a directory (default /)\n",
+ "<interface> <dev[:part]> [directory]\n"
+ " - list directory of device 'dev' partition 'part' at 'interface'\n"
+);
+
+U_BOOT_CMD(
+ ffsload, 6, 0, do_ffs_load,
+ "ffsload - load binary file from a FFS filesystem\n",
+ "<interface> <dev[:part]> [addr] [filename] [bytes]\n"
+ " - load binary file from device 'dev' partition 'part'\n"
+ " at 'interface' to address 'addr'\n"
+);
diff -r 83d0dd6dceee fs/Makefile
- --- a/fs/Makefile Mon Nov 03 10:32:53 2008 +0300
+++ b/fs/Makefile Mon Nov 03 15:49:29 2008 +0300
@@ -26,6 +26,7 @@
subdirs-$(CONFIG_CMD_EXT2) += ext2
subdirs-$(CONFIG_CMD_FAT) += fat
subdirs-$(CONFIG_CMD_FDOS) += fdos
+subdirs-$(CONFIG_CMD_FFS) += ffs
subdirs-$(CONFIG_CMD_JFFS2) += jffs2
subdirs-$(CONFIG_CMD_REISER) += reiserfs
subdirs-$(CONFIG_YAFFS2) += yaffs2
diff -r 83d0dd6dceee fs/ffs/Makefile
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fs/ffs/Makefile Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,52 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+#
+# (C) Copyright 2003
+# Pavel Bartusek, Sysgo Real-Time Solutions AG, pba at sysgo.de
+#
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)libffs.a
+
+AOBJS =
+COBJS = ffs.o
+
+SRCS := $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(AOBJS) $(COBJS))
+
+#CPPFLAGS +=
+
+all: $(LIB) $(AOBJS)
+
+$(LIB): $(obj).depend $(OBJS)
+ $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff -r 83d0dd6dceee fs/ffs/ffs.c
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fs/ffs/ffs.c Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,670 @@
+/*-
+ * Copyright (c) 2008 Stanislav Sedov <stas at FreeBSD.org>.
+ * All rights reserved.
+ * Copyright (c) 2002 McAfee, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by Marshall
+ * Kirk McKusick and McAfee Research,, the Security Research Division of
+ * McAfee, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as
+ * part of the DARPA CHATS research program
+ *
+ * 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.
+ *
+ * Copyright (c) 1998 Robert Nordier
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are freely
+ * permitted provided that the above copyright notice and this
+ * paragraph and the following disclaimer are duplicated in all
+ * such forms.
+ *
+ * This software is provided "AS IS" and without any express or
+ * implied warranties, including, without limitation, the implied
+ * warranties of merchantability and fitness for a particular
+ * purpose.
+ */
+
+#include <common.h>
+#include <config.h>
+
+#if defined(CONFIG_CMD_FFS)
+#include <ffs_dinode.h>
+#include <ffs_fs.h>
+#include <ffs.h>
+#include <malloc.h>
+
+/*
+ * We use 4k `virtual' blocks for filesystem data, whatever the actual
+ * filesystem block size. FFS blocks are always a multiple of 4k.
+ */
+#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
+#define DEV_BSIZE (1<<DEV_BSHIFT)
+#define VBLKSHIFT 12
+#define VBLKSIZE (1 << VBLKSHIFT)
+#define VBLKMASK (VBLKSIZE - 1)
+#define DBPERVBLK (VBLKSIZE / DEV_BSIZE)
+#define INDIRPERVBLK(fs) (NINDIR(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
+#define IPERVBLK(fs) (INOPB(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
+#define INO_TO_VBA(fs, ipervblk, x) \
+ (fsbtodb(fs, cgimin(fs, ino_to_cg(fs, x))) + \
+ (((x) % (fs)->fs_ipg) / (ipervblk) * DBPERVBLK))
+#define INO_TO_VBO(ipervblk, x) ((x) % ipervblk)
+#define FS_TO_VBA(fs, fsb, off) (fsbtodb(fs, fsb) + \
+ ((off) / VBLKSIZE) * DBPERVBLK)
+#define FS_TO_VBO(fs, fsb, off) ((off) & VBLKMASK)
+#define DIP(node, field) ((node)->ver == 1 ? (node)->inode1.field : \
+ (node)->inode2.field)
+
+
+/*
+ * File types
+ */
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+
+#define MAXBSIZE 65536
+
+struct dirent {
+ uint32_t d_fileno; /* file number of entry */
+ uint16_t d_reclen; /* length of this record */
+ uint8_t d_type; /* file type, see below */
+ uint8_t d_namlen; /* length of string in d_name */
+#define MAXNAMLEN 255
+ char d_name[MAXNAMLEN + 1]; /* name must be no longer */
+};
+typedef struct {
+ struct fs fs;
+ block_dev_desc_t *dev;
+ long part;
+ uint8_t ver;
+} ffs_mount_t;
+typedef struct {
+ union {
+ struct ufs1_dinode inode1;
+ struct ufs2_dinode inode2;
+ };
+ ffs_mount_t *mount;
+ uint8_t ver;
+} ffs_node_t;
+
+/*
+ * Convert between stat structure types and directory types.
+ */
+#define IFTODT(mode) (((mode) & 0170000) >> 12)
+#define DTTOIF(dirtype) ((dirtype) << 12)
+
+static ino_t lookup(ffs_mount_t *mount, const char *path);
+static ssize_t fsread(ffs_mount_t *mount, ffs_node_t *node, void *buf,
+ size_t len, uint32_t off);
+static int ffs_open(ffs_mount_t *mount, ino_t ino, ffs_node_t *node);
+
+static int
+dskread(block_dev_desc_t *desc, long part, void *buf, unsigned lba,
+ unsigned int nblk)
+{
+ disk_partition_t pinfo;
+ int error;
+
+ if (part == 0) {
+ pinfo.start = 0;
+ pinfo.size = desc->lba;
+ pinfo.blksz = desc->blksz;
+ } else {
+ error = get_partition_info(desc, part, &pinfo);
+ if (error != 0)
+ return (error);
+ }
+ if (lba >= pinfo.size) {
+ printf("Error: reading outside the partition size\n");
+ return (1);
+ }
+ error = desc->block_read(desc->dev, pinfo.start + lba, nblk, buf);
+ if (error != nblk) {
+ printf("Error: not all blocks read: wanted %d got %d\n", nblk,
+ error);
+ return (1);
+ }
+ return (0);
+}
+
+static int
+fsfind(ffs_mount_t *mount, const char *name, ino_t *ino)
+{
+ char buf[DEV_BSIZE];
+ struct dirent *d;
+ char *s;
+ ssize_t n;
+ uint32_t off;
+ ffs_node_t *node = NULL;
+ int error;
+
+ node = (ffs_node_t *)malloc(sizeof(*node));
+ if (node == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*node));
+ return (0);
+ }
+ error = ffs_open(mount, *ino, node);
+ if (error != 0) {
+ printf("Error: could not read inode.\n");
+ free(node);
+ return (0);
+ }
+ off = 0;
+ while ((n = fsread(mount, node, buf, DEV_BSIZE, off)) > 0) {
+ for (s = buf; s < buf + DEV_BSIZE;) {
+ d = (void *)s;
+ if (!strcmp(name, d->d_name)) {
+ *ino = d->d_fileno;
+ free(node);
+ return (d->d_type);
+ }
+ s += d->d_reclen;
+ }
+ off += n;
+ }
+ free(node);
+ return (0);
+}
+
+static ino_t
+lookup(ffs_mount_t *mount, const char *path)
+{
+ char name[MAXNAMLEN + 1];
+ const char *s;
+ ino_t ino;
+ ssize_t n;
+ int dt;
+
+ ino = ROOTINO;
+ dt = DT_DIR;
+ name[0] = '/';
+ name[1] = '\0';
+ for (;;) {
+ if (*path == '/')
+ path++;
+ if (!*path)
+ break;
+ for (s = path; *s && *s != '/'; s++);
+ n = s - path;
+ if (n > MAXNAMLEN)
+ return (0);
+ memcpy(name, path, n);
+ name[n] = 0;
+ if (dt != DT_DIR) {
+ printf("%s: not a directory.\n", name);
+ return (0);
+ }
+ if ((dt = fsfind(mount, name, &ino)) <= 0)
+ break;
+ path = s;
+ }
+ return (ino);
+}
+
+/*
+ * Possible superblock locations ordered from most to least likely.
+ */
+static int sblocksearch[] = SBLOCKSEARCH;
+
+static int
+ffs_mount(block_dev_desc_t *desc, long part, ffs_mount_t *mount)
+{
+ int i;
+ struct fs *buf;
+ int error;
+
+ assert(mount != NULL);
+ buf = (struct fs *)malloc(SBLOCKSIZE);
+ if (buf == NULL) {
+ printf("Error: allocating buffer of size %d failed.\n",
+ SBLOCKSIZE);
+ return (-1);
+ }
+
+ /*
+ * Try to read the superblock.
+ */
+ for (i = 0; sblocksearch[i] != -1; i++) {
+ error = dskread(desc, part, buf, sblocksearch[i] / DEV_BSIZE,
+ SBLOCKSIZE / DEV_BSIZE);
+ if (error != 0) {
+ printf("Error reading superblock.\n");
+ free(buf);
+ return (-1);
+ }
+ /* Check for correct block size. */
+ if (buf->fs_bsize > MAXBSIZE ||
+ buf->fs_bsize < sizeof(struct fs))
+ continue;
+ /* Check for magic. */
+ if (buf->fs_magic == FS_UFS1_MAGIC) {
+ mount->ver = 1;
+ break;
+ }
+ if (buf->fs_magic == FS_UFS2_MAGIC &&
+ buf->fs_sblockloc == sblocksearch[i]) {
+ mount->ver = 2;
+ break;
+ }
+ }
+ if (sblocksearch[i] == -1) {
+ printf("UFS superblock was not found.\n");
+ free(buf);
+ return(-1);
+ }
+ mount->dev = desc;
+ mount->part = part;
+ memcpy(&mount->fs, buf, sizeof(struct fs));
+ free(buf);
+ return (0);
+}
+
+static int
+ffs_open(ffs_mount_t *mount, ino_t ino, ffs_node_t *node)
+{
+ size_t ipervblk, i_off, len;
+ struct fs *fs;
+ char *blkbuf;
+ int error;
+
+ assert(node != NULL);
+ assert(ino != 0);
+ fs = &mount->fs;
+
+ blkbuf = (char *)malloc(VBLKSIZE);
+ if (blkbuf == NULL) {
+ printf("Error: allocating buffer of size %d failed.\n",
+ VBLKSIZE);
+ return (-1);
+ }
+
+ /*
+ * Read the inode requested.
+ */
+ ipervblk = IPERVBLK(fs);
+ error = dskread(mount->dev, mount->part, blkbuf,
+ INO_TO_VBA(fs, ipervblk, ino), DBPERVBLK);
+ if (error != 0) {
+ printf("Error reading inode.\n");
+ free(blkbuf);
+ return (-1);
+ }
+ node->mount = mount;
+ node->ver = mount->ver;
+ i_off = INO_TO_VBO(ipervblk, ino);
+ if (mount->ver == 1) {
+ len = sizeof(struct ufs1_dinode);
+ memcpy(&node->inode1, blkbuf + i_off * len, len);
+ } else {
+ len = sizeof(struct ufs2_dinode);
+ memcpy(&node->inode2, blkbuf + i_off * len, len);
+ }
+ free(blkbuf);
+ return (0);
+}
+
+static ssize_t
+fsread(ffs_mount_t *mount, ffs_node_t *node, void *buf, size_t len,
+ uint32_t off)
+{
+ char *blkbuf = NULL;
+ void *indbuf = NULL;
+ size_t left, size, f_off, vboff;
+ ufs_lbn_t f_lbn;
+ ufs2_daddr_t addr, vbaddr;
+ int i, n;
+ int error;
+ int indirpervblk;
+ struct fs *fs;
+
+ assert(mount != NULL);
+ assert(node != NULL);
+
+ /*
+ * Allocate work memory.
+ */
+ blkbuf = (char *)malloc(VBLKSIZE);
+ indbuf = malloc(VBLKSIZE);
+ if (blkbuf == NULL || indbuf == NULL) {
+ printf("Error: allocating buffers of size %d failed.\n",
+ VBLKSIZE);
+ error = -1;
+ goto fail;
+ }
+
+ fs = &mount->fs;
+ size = DIP(node, di_size);
+ n = size - off;
+ if (len > n)
+ len = n;
+ left = len;
+ while (left > 0) {
+ f_lbn = lblkno(fs, off); /* Block number of the file. */
+ f_off = blkoff(fs, off); /* Offset in the file block. */
+
+ /*
+ * Get the address of the block requested.
+ */
+ if (f_lbn < NDADDR) {
+ addr = DIP(node, di_db[f_lbn]);
+ } else if (f_lbn < NDADDR + NINDIR(fs)) {
+ /*
+ * Try to read the block map table.
+ */
+ indirpervblk = INDIRPERVBLK(fs);
+ addr = DIP(node, di_ib[0]);
+ vbaddr = fsbtodb(fs, addr) + /* Block map address. */
+ (f_lbn - NDADDR) / (indirpervblk * DBPERVBLK);
+ error = dskread(mount->dev, mount->part, indbuf,
+ vbaddr, DBPERVBLK);
+ if (error != 0) {
+ printf("Error reading indirect block map.\n");
+ error = -1;
+ goto fail;
+ }
+ /* Offset in the table. */
+ i = (f_lbn - NDADDR) & (indirpervblk - 1);
+ if (fs->fs_magic == FS_UFS1_MAGIC)
+ addr = ((ufs1_daddr_t *)indbuf)[i];
+ else
+ addr = ((ufs2_daddr_t *)indbuf)[i];
+ } else {
+ printf("Error: double-indirect blocks are not"
+ " supported (yet).");
+ goto fail;
+ }
+
+ /*
+ * Read the block itself.
+ */
+ vbaddr = fsbtodb(fs, addr) + (f_off >> VBLKSHIFT) * DBPERVBLK;
+ vboff = f_off & VBLKMASK;
+ i = sblksize(fs, size, f_lbn) - (f_off & ~VBLKMASK);
+ if (i > VBLKSIZE)
+ i = VBLKSIZE;
+ error = dskread(mount->dev, mount->part, blkbuf, vbaddr,
+ i >> DEV_BSHIFT);
+ if (error != 0) {
+ printf("Error reading data block.\n");
+ error = -1;
+ goto fail;
+ }
+ i -= vboff;
+ if (i > left)
+ i = left;
+ memcpy(buf, blkbuf + vboff, i);
+ buf += i;
+ off += i;
+ left -= i;
+ }
+ error = len;
+
+fail:
+ if (blkbuf != NULL)
+ free(blkbuf);
+ if (indbuf != NULL)
+ free(indbuf);
+ return (error);
+}
+
+int
+ffs_probe(block_dev_desc_t *desc, long part)
+{
+ ffs_mount_t *mount = NULL;
+ int error;
+
+ mount = (ffs_mount_t *)malloc(sizeof(*mount));
+ if (mount == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*mount));
+ return (1);
+ }
+
+ /*
+ * Try to mount the fs.
+ */
+ error = ffs_mount(desc, part, mount);
+ free(mount);
+ return (error);
+}
+
+int
+ffs_getfilelength(block_dev_desc_t *desc, long part, const char *filename,
+ unsigned long *len)
+{
+ ffs_mount_t *mount = NULL;
+ ffs_node_t *node = NULL;
+ ino_t ino;
+ int error;
+
+ mount = (ffs_mount_t *)malloc(sizeof(*mount));
+ if (mount == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*mount));
+ return (1);
+ }
+
+ /*
+ * Try to mount the fs.
+ */
+ error = ffs_mount(desc, part, mount);
+ if (error != 0) {
+ printf("Error: could not mount the filesystem.\n");
+ goto fail;
+ }
+
+ ino = lookup(mount, filename);
+ if (ino == 0) {
+ error = 1;
+ goto fail;
+ }
+
+ /*
+ * Open the file.
+ */
+ node = (ffs_node_t *)malloc(sizeof(*node));
+ if (node == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*node));
+ error = 1;
+ goto fail;
+ }
+ error = ffs_open(mount, ino, node);
+ if (error != 0)
+ printf("Error: could not read inode.\n");
+ else
+ *len = DIP(node, di_size);
+fail:
+ if (mount != NULL)
+ free(mount);
+ return (error);
+}
+
+int
+ffs_ls(block_dev_desc_t *desc, long part, const char *filename)
+{
+ char buf[DEV_BSIZE];
+ struct dirent *d;
+ char *s;
+ ssize_t n;
+ ino_t ino;
+ uint32_t off;
+ ffs_mount_t *mount = NULL;
+ ffs_node_t *node = NULL, *fnode = NULL;
+ int error;
+
+ if (*filename == '\0') {
+ printf("Error: empty filename\n");
+ return (1);
+ }
+
+ mount = (ffs_mount_t *)malloc(sizeof(*mount));
+ if (mount == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*mount));
+ return (1);
+ }
+
+ /*
+ * Try to mount the fs.
+ */
+ error = ffs_mount(desc, part, mount);
+ if (error != 0) {
+ printf("Error: could not mount the filesystem.\n");
+ error = 1;
+ goto fail;
+ }
+
+ /*
+ * Try to locate the file.
+ */
+ ino = lookup(mount, filename);
+ if (ino == 0) {
+ printf("Error: not found\n");
+ error = 1;
+ goto fail;
+ }
+
+ /*
+ * Open the directory file and read it.
+ */
+ node = (ffs_node_t *)malloc(sizeof(*node));
+ fnode = (ffs_node_t *)malloc(sizeof(*fnode));
+ if (node == NULL || fnode == NULL) {
+ printf("Error: allocating %ld bytes failed.\n",
+ 2 * sizeof(*node));
+ error = 1;
+ goto fail;
+ }
+ error = ffs_open(mount, ino, node);
+ if (error != 0) {
+ printf("Error: could not read inode.\n");
+ error = 1;
+ goto fail;
+ }
+
+ off = 0;
+ printf("%-8s%-15s%s\n", "INODE", "SIZE", "NAME");
+ while ((n = fsread(mount, node, buf, DEV_BSIZE, off)) > 0) {
+ for (s = buf; s < buf + DEV_BSIZE;) {
+ d = (void *)s;
+ s += d->d_reclen;
+ error = ffs_open(mount, d->d_fileno, fnode);
+ if (error != 0) {
+ printf("Error: could not open file %s\n",
+ d->d_name);
+ continue;
+ }
+ printf("%-8d%-15d%s", d->d_fileno,
+ (int)DIP(fnode, di_size), d->d_name);
+ if (d->d_type == DT_DIR)
+ printf("/");
+ printf("\n");
+ }
+ off += n;
+ }
+ printf("\n");
+ error = 0;
+fail:
+ if (node != NULL)
+ free(node);
+ if (fnode != NULL)
+ free(fnode);
+ if (mount != NULL)
+ free(mount);
+ return (error);
+}
+
+int
+ffs_read(block_dev_desc_t *desc, long part, const char *filename, char *addr,
+ unsigned long len)
+{
+ ino_t ino;
+ int error;
+ ffs_mount_t *mount = NULL;
+ ffs_node_t *node = NULL;
+
+ if (*filename == '\0') {
+ printf("Error: empty filename\n");
+ return (1);
+ }
+
+ mount = (ffs_mount_t *)malloc(sizeof(*mount));
+ if (mount == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*mount));
+ return (1);
+ }
+
+ /*
+ * Try to mount the fs.
+ */
+ error = ffs_mount(desc, part, mount);
+ if (error != 0) {
+ printf("Error: could not mount the filesystem.\n");
+ error = 1;
+ goto fail;
+ }
+
+ /*
+ * Try to locate the file.
+ */
+ ino = lookup(mount, filename);
+ if (ino == 0) {
+ printf("Error: not found\n");
+ error = 1;
+ goto fail;
+ }
+
+ /*
+ * Open the file and read it.
+ */
+ node = (ffs_node_t *)malloc(sizeof(*node));
+ if (node == NULL) {
+ printf("Error: allocating %ld bytes failed.\n", sizeof(*node));
+ error = 1;
+ goto fail;
+ }
+ error = ffs_open(mount, ino, node);
+ if (error != 0) {
+ printf("Error: could not read inode.\n");
+ error = 1;
+ goto fail;
+ }
+ error = fsread(mount, node, addr, len, 0);
+ if (error != len) {
+ printf("Error: not all data read: wanted %ld got %d\n", len,
+ error);
+ error = 1;
+ } else
+ error = 0;
+fail:
+ if (node != NULL)
+ free(node);
+ if (mount != NULL)
+ free(mount);
+ return (error);
+}
+#endif
diff -r 83d0dd6dceee include/ffs.h
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/ffs.h Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,32 @@
+/*-
+ * Copyright (c) 2008 Deglitch Networks http://www.deglitch.com/
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * Author: Stanislav Sedov <stas at FreeBSD.org>
+ */
+#ifndef _FFS_H_
+#define _FFS_H_
+int ffs_probe(block_dev_desc_t *desc, long part);
+int ffs_ls(block_dev_desc_t *desc, long part, const char *filename);
+int ffs_read(block_dev_desc_t *desc, long part, const char *filename,
+ char *addr, unsigned long len);
+int ffs_getfilelength(block_dev_desc_t *desc, long part,
+ const char *filename, unsigned long *len);
+#endif /* !_FFS_H_ */
diff -r 83d0dd6dceee include/ffs_dinode.h
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/ffs_dinode.h Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,191 @@
+/*-
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by Marshall
+ * Kirk McKusick and Network Associates Laboratories, the Security
+ * Research Division of Network Associates, Inc. under DARPA/SPAWAR
+ * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
+ * research program
+ *
+ * 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.
+ *
+ * Copyright (c) 1982, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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.
+ * 3. The names of the authors may not be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * 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.
+ *
+ * @(#)dinode.h 8.3 (Berkeley) 1/21/94
+ * $FreeBSD: src/sys/ufs/ufs/dinode.h,v 1.17 2006/05/21 21:55:29 maxim Exp $
+ */
+
+#ifndef _UFS_UFS_DINODE_H_
+#define _UFS_UFS_DINODE_H_
+
+/*
+ * The root inode is the root of the filesystem. Inode 0 can't be used for
+ * normal purposes and historically bad blocks were linked to inode 1, thus
+ * the root inode is 2. (Inode 1 is no longer used for this purpose, however
+ * numerous dump tapes make this assumption, so we are stuck with it).
+ */
+#define ROOTINO ((ino_t)2)
+
+/*
+ * The Whiteout inode# is a dummy non-zero inode number which will
+ * never be allocated to a real file. It is used as a place holder
+ * in the directory entry which has been tagged as a DT_WHT entry.
+ * See the comments about ROOTINO above.
+ */
+#define WINO ((ino_t)1)
+
+/*
+ * The size of physical and logical block numbers and time fields in UFS.
+ */
+typedef int32_t ufs1_daddr_t;
+typedef int64_t ufs2_daddr_t;
+typedef int64_t ufs_lbn_t;
+typedef int64_t ufs_time_t;
+
+/* File permissions. */
+#define IEXEC 0000100 /* Executable. */
+#define IWRITE 0000200 /* Writeable. */
+#define IREAD 0000400 /* Readable. */
+#define ISVTX 0001000 /* Sticky bit. */
+#define ISGID 0002000 /* Set-gid. */
+#define ISUID 0004000 /* Set-uid. */
+
+/* File types. */
+#define IFMT 0170000 /* Mask of file type. */
+#define IFIFO 0010000 /* Named pipe (fifo). */
+#define IFCHR 0020000 /* Character device. */
+#define IFDIR 0040000 /* Directory file. */
+#define IFBLK 0060000 /* Block device. */
+#define IFREG 0100000 /* Regular file. */
+#define IFLNK 0120000 /* Symbolic link. */
+#define IFSOCK 0140000 /* UNIX domain socket. */
+#define IFWHT 0160000 /* Whiteout. */
+
+/*
+ * A dinode contains all the meta-data associated with a UFS2 file.
+ * This structure defines the on-disk format of a dinode. Since
+ * this structure describes an on-disk structure, all its fields
+ * are defined by types with precise widths.
+ */
+
+#define NXADDR 2 /* External addresses in inode. */
+#define NDADDR 12 /* Direct addresses in inode. */
+#define NIADDR 3 /* Indirect addresses in inode. */
+
+struct ufs2_dinode {
+ u_int16_t di_mode; /* 0: IFMT, permissions; see below. */
+ int16_t di_nlink; /* 2: File link count. */
+ u_int32_t di_uid; /* 4: File owner. */
+ u_int32_t di_gid; /* 8: File group. */
+ u_int32_t di_blksize; /* 12: Inode blocksize. */
+ u_int64_t di_size; /* 16: File byte count. */
+ u_int64_t di_blocks; /* 24: Blocks actually held. */
+ ufs_time_t di_atime; /* 32: Last access time. */
+ ufs_time_t di_mtime; /* 40: Last modified time. */
+ ufs_time_t di_ctime; /* 48: Last inode change time. */
+ ufs_time_t di_birthtime; /* 56: Inode creation time. */
+ int32_t di_mtimensec; /* 64: Last modified time. */
+ int32_t di_atimensec; /* 68: Last access time. */
+ int32_t di_ctimensec; /* 72: Last inode change time. */
+ int32_t di_birthnsec; /* 76: Inode creation time. */
+ int32_t di_gen; /* 80: Generation number. */
+ u_int32_t di_kernflags; /* 84: Kernel flags. */
+ u_int32_t di_flags; /* 88: Status flags (chflags). */
+ int32_t di_extsize; /* 92: External attributes block. */
+ ufs2_daddr_t di_extb[NXADDR];/* 96: External attributes block. */
+ ufs2_daddr_t di_db[NDADDR]; /* 112: Direct disk blocks. */
+ ufs2_daddr_t di_ib[NIADDR]; /* 208: Indirect disk blocks. */
+ int64_t di_spare[3]; /* 232: Reserved; currently unused */
+};
+
+/*
+ * The di_db fields may be overlaid with other information for
+ * file types that do not have associated disk storage. Block
+ * and character devices overlay the first data block with their
+ * dev_t value. Short symbolic links place their path in the
+ * di_db area.
+ */
+#define di_rdev di_db[0]
+
+/*
+ * A UFS1 dinode contains all the meta-data associated with a UFS1 file.
+ * This structure defines the on-disk format of a UFS1 dinode. Since
+ * this structure describes an on-disk structure, all its fields
+ * are defined by types with precise widths.
+ */
+struct ufs1_dinode {
+ u_int16_t di_mode; /* 0: IFMT, permissions; see below. */
+ int16_t di_nlink; /* 2: File link count. */
+ union {
+ u_int16_t oldids[2]; /* 4: Ffs: old user and group ids. */
+ } di_u;
+ u_int64_t di_size; /* 8: File byte count. */
+ int32_t di_atime; /* 16: Last access time. */
+ int32_t di_atimensec; /* 20: Last access time. */
+ int32_t di_mtime; /* 24: Last modified time. */
+ int32_t di_mtimensec; /* 28: Last modified time. */
+ int32_t di_ctime; /* 32: Last inode change time. */
+ int32_t di_ctimensec; /* 36: Last inode change time. */
+ ufs1_daddr_t di_db[NDADDR]; /* 40: Direct disk blocks. */
+ ufs1_daddr_t di_ib[NIADDR]; /* 88: Indirect disk blocks. */
+ u_int32_t di_flags; /* 100: Status flags (chflags). */
+ int32_t di_blocks; /* 104: Blocks actually held. */
+ int32_t di_gen; /* 108: Generation number. */
+ u_int32_t di_uid; /* 112: File owner. */
+ u_int32_t di_gid; /* 116: File group. */
+ int32_t di_spare[2]; /* 120: Reserved; currently unused */
+};
+#define di_ogid di_u.oldids[1]
+#define di_ouid di_u.oldids[0]
+
+#endif /* _UFS_UFS_DINODE_H_ */
diff -r 83d0dd6dceee include/ffs_fs.h
- --- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/ffs_fs.h Mon Nov 03 15:49:29 2008 +0300
@@ -0,0 +1,616 @@
+/*-
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. 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.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ * @(#)fs.h 8.13 (Berkeley) 3/21/95
+ * $FreeBSD: src/sys/ufs/ffs/fs.h,v 1.49 2006/10/31 21:48:53 pjd Exp $
+ */
+
+#ifndef _UFS_FFS_FS_H_
+#define _UFS_FFS_FS_H_
+
+/*
+ * Each disk drive contains some number of filesystems.
+ * A filesystem consists of a number of cylinder groups.
+ * Each cylinder group has inodes and data.
+ *
+ * A filesystem is described by its super-block, which in turn
+ * describes the cylinder groups. The super-block is critical
+ * data and is replicated in each cylinder group to protect against
+ * catastrophic loss. This is done at `newfs' time and the critical
+ * super-block data does not change, so the copies need not be
+ * referenced further unless disaster strikes.
+ *
+ * For filesystem fs, the offsets of the various blocks of interest
+ * are given in the super block as:
+ * [fs->fs_sblkno] Super-block
+ * [fs->fs_cblkno] Cylinder group block
+ * [fs->fs_iblkno] Inode blocks
+ * [fs->fs_dblkno] Data blocks
+ * The beginning of cylinder group cg in fs, is given by
+ * the ``cgbase(fs, cg)'' macro.
+ *
+ * Depending on the architecture and the media, the superblock may
+ * reside in any one of four places. For tiny media where every block
+ * counts, it is placed at the very front of the partition. Historically,
+ * UFS1 placed it 8K from the front to leave room for the disk label and
+ * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
+ * room for the disk label and a bigger bootstrap, and for really piggy
+ * systems we check at 256K from the front if the first three fail. In
+ * all cases the size of the superblock will be SBLOCKSIZE. All values are
+ * given in byte-offset form, so they do not imply a sector size. The
+ * SBLOCKSEARCH specifies the order in which the locations should be searched.
+ */
+#define SBLOCK_FLOPPY 0
+#define SBLOCK_UFS1 8192
+#define SBLOCK_UFS2 65536
+#define SBLOCK_PIGGY 262144
+#define SBLOCKSIZE 8192
+#define SBLOCKSEARCH \
+ { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
+
+/*
+ * Max number of fragments per block. This value is NOT tweakable.
+ */
+#define MAXFRAG 8
+
+/*
+ * Addresses stored in inodes are capable of addressing fragments
+ * of `blocks'. File system blocks of at most size MAXBSIZE can
+ * be optionally broken into 2, 4, or 8 pieces, each of which is
+ * addressable; these pieces may be DEV_BSIZE, or some multiple of
+ * a DEV_BSIZE unit.
+ *
+ * Large files consist of exclusively large data blocks. To avoid
+ * undue wasted disk space, the last data block of a small file may be
+ * allocated as only as many fragments of a large block as are
+ * necessary. The filesystem format retains only a single pointer
+ * to such a fragment, which is a piece of a single large block that
+ * has been divided. The size of such a fragment is determinable from
+ * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
+ *
+ * The filesystem records space availability at the fragment level;
+ * to determine block availability, aligned fragments are examined.
+ */
+
+/*
+ * MINBSIZE is the smallest allowable block size.
+ * In order to insure that it is possible to create files of size
+ * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
+ * MINBSIZE must be big enough to hold a cylinder group block,
+ * thus changes to (struct cg) must keep its size within MINBSIZE.
+ * Note that super blocks are always of size SBSIZE,
+ * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
+ */
+#define MINBSIZE 4096
+
+/*
+ * The path name on which the filesystem is mounted is maintained
+ * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
+ * the super block for this name.
+ */
+#define MAXMNTLEN 468
+
+/*
+ * The volume name for this filesystem is maintained in fs_volname.
+ * MAXVOLLEN defines the length of the buffer allocated.
+ */
+#define MAXVOLLEN 32
+
+/*
+ * There is a 128-byte region in the superblock reserved for in-core
+ * pointers to summary information. Originally this included an array
+ * of pointers to blocks of struct csum; now there are just a few
+ * pointers and the remaining space is padded with fs_ocsp[].
+ *
+ * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
+ * is taken away to point to a contiguous array of struct csum for
+ * all cylinder groups; a second (fs_maxcluster) points to an array
+ * of cluster sizes that is computed as cylinder groups are inspected,
+ * and the third points to an array that tracks the creation of new
+ * directories. A fourth pointer, fs_active, is used when creating
+ * snapshots; it points to a bitmap of cylinder groups for which the
+ * free-block bitmap has changed since the snapshot operation began.
+ */
+#define NOCSPTRS ((128 / sizeof(void *)) - 4)
+
+/*
+ * A summary of contiguous blocks of various sizes is maintained
+ * in each cylinder group. Normally this is set by the initial
+ * value of fs_maxcontig. To conserve space, a maximum summary size
+ * is set by FS_MAXCONTIG.
+ */
+#define FS_MAXCONTIG 16
+
+/*
+ * MINFREE gives the minimum acceptable percentage of filesystem
+ * blocks which may be free. If the freelist drops below this level
+ * only the superuser may continue to allocate blocks. This may
+ * be set to 0 if no reserve of free blocks is deemed necessary,
+ * however throughput drops by fifty percent if the filesystem
+ * is run at between 95% and 100% full; thus the minimum default
+ * value of fs_minfree is 5%. However, to get good clustering
+ * performance, 10% is a better choice. hence we use 10% as our
+ * default value. With 10% free space, fragmentation is not a
+ * problem, so we choose to optimize for time.
+ */
+#define MINFREE 8
+#define DEFAULTOPT FS_OPTTIME
+
+/*
+ * Grigoriy Orlov <gluk at ptci.ru> has done some extensive work to fine
+ * tune the layout preferences for directories within a filesystem.
+ * His algorithm can be tuned by adjusting the following parameters
+ * which tell the system the average file size and the average number
+ * of files per directory. These defaults are well selected for typical
+ * filesystems, but may need to be tuned for odd cases like filesystems
+ * being used for squid caches or news spools.
+ */
+#define AVFILESIZ 16384 /* expected average file size */
+#define AFPDIR 64 /* expected number of files per directory */
+
+/*
+ * The maximum number of snapshot nodes that can be associated
+ * with each filesystem. This limit affects only the number of
+ * snapshot files that can be recorded within the superblock so
+ * that they can be found when the filesystem is mounted. However,
+ * maintaining too many will slow the filesystem performance, so
+ * having this limit is a good idea.
+ */
+#define FSMAXSNAP 20
+
+/*
+ * Used to identify special blocks in snapshots:
+ *
+ * BLK_NOCOPY - A block that was unallocated at the time the snapshot
+ * was taken, hence does not need to be copied when written.
+ * BLK_SNAP - A block held by another snapshot that is not needed by this
+ * snapshot. When the other snapshot is freed, the BLK_SNAP entries
+ * are converted to BLK_NOCOPY. These are needed to allow fsck to
+ * identify blocks that are in use by other snapshots (which are
+ * expunged from this snapshot).
+ */
+#define BLK_NOCOPY ((ufs2_daddr_t)(1))
+#define BLK_SNAP ((ufs2_daddr_t)(2))
+
+/*
+ * Sysctl values for the fast filesystem.
+ */
+#define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
+#define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
+#define FFS_BLK_FREE 3 /* free range of blocks in map */
+#define FFS_DIR_FREE 4 /* free specified dir inodes in map */
+#define FFS_FILE_FREE 5 /* free specified file inodes in map */
+#define FFS_SET_FLAGS 6 /* set filesystem flags */
+#define FFS_ADJ_NDIR 7 /* adjust number of directories */
+#define FFS_ADJ_NBFREE 8 /* adjust number of free blocks */
+#define FFS_ADJ_NIFREE 9 /* adjust number of free inodes */
+#define FFS_ADJ_NFFREE 10 /* adjust number of free frags */
+#define FFS_ADJ_NUMCLUSTERS 11 /* adjust number of free clusters */
+#define FFS_MAXID 12 /* number of valid ffs ids */
+
+/*
+ * Command structure passed in to the filesystem to adjust filesystem values.
+ */
+#define FFS_CMD_VERSION 0x19790518 /* version ID */
+struct fsck_cmd {
+ int32_t version; /* version of command structure */
+ int32_t handle; /* reference to filesystem to be changed */
+ int64_t value; /* inode or block number to be affected */
+ int64_t size; /* amount or range to be adjusted */
+ int64_t spare; /* reserved for future use */
+};
+
+/*
+ * Per cylinder group information; summarized in blocks allocated
+ * from first cylinder group data blocks. These blocks have to be
+ * read in from fs_csaddr (size fs_cssize) in addition to the
+ * super block.
+ */
+struct csum {
+ int32_t cs_ndir; /* number of directories */
+ int32_t cs_nbfree; /* number of free blocks */
+ int32_t cs_nifree; /* number of free inodes */
+ int32_t cs_nffree; /* number of free frags */
+};
+struct csum_total {
+ int64_t cs_ndir; /* number of directories */
+ int64_t cs_nbfree; /* number of free blocks */
+ int64_t cs_nifree; /* number of free inodes */
+ int64_t cs_nffree; /* number of free frags */
+ int64_t cs_numclusters; /* number of free clusters */
+ int64_t cs_spare[3]; /* future expansion */
+};
+
+/*
+ * Super block for an FFS filesystem.
+ */
+struct fs {
+ int32_t fs_firstfield; /* historic filesystem linked list, */
+ int32_t fs_unused_1; /* used for incore super blocks */
+ int32_t fs_sblkno; /* offset of super-block in filesys */
+ int32_t fs_cblkno; /* offset of cyl-block in filesys */
+ int32_t fs_iblkno; /* offset of inode-blocks in filesys */
+ int32_t fs_dblkno; /* offset of first data after cg */
+ int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
+ int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
+ int32_t fs_old_time; /* last time written */
+ int32_t fs_old_size; /* number of blocks in fs */
+ int32_t fs_old_dsize; /* number of data blocks in fs */
+ int32_t fs_ncg; /* number of cylinder groups */
+ int32_t fs_bsize; /* size of basic blocks in fs */
+ int32_t fs_fsize; /* size of frag blocks in fs */
+ int32_t fs_frag; /* number of frags in a block in fs */
+/* these are configuration parameters */
+ int32_t fs_minfree; /* minimum percentage of free blocks */
+ int32_t fs_old_rotdelay; /* num of ms for optimal next block */
+ int32_t fs_old_rps; /* disk revolutions per second */
+/* these fields can be computed from the others */
+ int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
+ int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
+ int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
+ int32_t fs_fshift; /* ``numfrags'' calc number of frags */
+/* these are configuration parameters */
+ int32_t fs_maxcontig; /* max number of contiguous blks */
+ int32_t fs_maxbpg; /* max number of blks per cyl group */
+/* these fields can be computed from the others */
+ int32_t fs_fragshift; /* block to frag shift */
+ int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
+ int32_t fs_sbsize; /* actual size of super block */
+ int32_t fs_spare1[2]; /* old fs_csmask */
+ /* old fs_csshift */
+ int32_t fs_nindir; /* value of NINDIR */
+ int32_t fs_inopb; /* value of INOPB */
+ int32_t fs_old_nspf; /* value of NSPF */
+/* yet another configuration parameter */
+ int32_t fs_optim; /* optimization preference, see below */
+ int32_t fs_old_npsect; /* # sectors/track including spares */
+ int32_t fs_old_interleave; /* hardware sector interleave */
+ int32_t fs_old_trackskew; /* sector 0 skew, per track */
+ int32_t fs_id[2]; /* unique filesystem id */
+/* sizes determined by number of cylinder groups and their sizes */
+ int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */
+ int32_t fs_cssize; /* size of cyl grp summary area */
+ int32_t fs_cgsize; /* cylinder group size */
+ int32_t fs_spare2; /* old fs_ntrak */
+ int32_t fs_old_nsect; /* sectors per track */
+ int32_t fs_old_spc; /* sectors per cylinder */
+ int32_t fs_old_ncyl; /* cylinders in filesystem */
+ int32_t fs_old_cpg; /* cylinders per group */
+ int32_t fs_ipg; /* inodes per group */
+ int32_t fs_fpg; /* blocks per group * fs_frag */
+/* this data must be re-computed after crashes */
+ struct csum fs_old_cstotal; /* cylinder summary information */
+/* these fields are cleared at mount time */
+ int8_t fs_fmod; /* super block modified flag */
+ int8_t fs_clean; /* filesystem is clean flag */
+ int8_t fs_ronly; /* mounted read-only flag */
+ int8_t fs_old_flags; /* old FS_ flags */
+ u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
+ u_char fs_volname[MAXVOLLEN]; /* volume name */
+ u_int64_t fs_swuid; /* system-wide uid */
+ int32_t fs_pad; /* due to alignment of fs_swuid */
+/* these fields retain the current block allocation info */
+ int32_t fs_cgrotor; /* last cg searched */
+ void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
+ u_int8_t *fs_contigdirs; /* (u) # of contig. allocated dirs */
+ struct csum *fs_csp; /* (u) cg summary info buffer */
+ int32_t *fs_maxcluster; /* (u) max cluster in each cyl group */
+ u_int *fs_active; /* (u) used by snapshots to track fs */
+ int32_t fs_old_cpc; /* cyl per cycle in postbl */
+ int32_t fs_maxbsize; /* maximum blocking factor permitted */
+ int64_t fs_unrefs; /* number of unreferenced inodes */
+ int64_t fs_sparecon64[16]; /* old rotation block list head */
+ int64_t fs_sblockloc; /* byte offset of standard superblock */
+ struct csum_total fs_cstotal; /* (u) cylinder summary information */
+ ufs_time_t fs_time; /* last time written */
+ int64_t fs_size; /* number of blocks in fs */
+ int64_t fs_dsize; /* number of data blocks in fs */
+ ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
+ int64_t fs_pendingblocks; /* (u) blocks being freed */
+ int32_t fs_pendinginodes; /* (u) inodes being freed */
+ int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
+ int32_t fs_avgfilesize; /* expected average file size */
+ int32_t fs_avgfpdir; /* expected # of files per directory */
+ int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
+ int32_t fs_sparecon32[26]; /* reserved for future constants */
+ int32_t fs_flags; /* see FS_ flags below */
+ int32_t fs_contigsumsize; /* size of cluster summary array */
+ int32_t fs_maxsymlinklen; /* max length of an internal symlink */
+ int32_t fs_old_inodefmt; /* format of on-disk inodes */
+ u_int64_t fs_maxfilesize; /* maximum representable file size */
+ int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
+ int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
+ int32_t fs_state; /* validate fs_clean field */
+ int32_t fs_old_postblformat; /* format of positional layout tables */
+ int32_t fs_old_nrpos; /* number of rotational positions */
+ int32_t fs_spare5[2]; /* old fs_postbloff */
+ /* old fs_rotbloff */
+ int32_t fs_magic; /* magic number */
+};
+
+/* Sanity checking. */
+#ifdef CTASSERT
+CTASSERT(sizeof(struct fs) == 1376);
+#endif
+
+/*
+ * Filesystem identification
+ */
+#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */
+#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */
+#define FS_BAD_MAGIC 0x19960408 /* UFS incomplete newfs magic number */
+#define FS_OKAY 0x7c269d38 /* superblock checksum */
+#define FS_42INODEFMT -1 /* 4.2BSD inode format */
+#define FS_44INODEFMT 2 /* 4.4BSD inode format */
+
+/*
+ * Preference for optimization.
+ */
+#define FS_OPTTIME 0 /* minimize allocation time */
+#define FS_OPTSPACE 1 /* minimize disk fragmentation */
+
+/*
+ * Filesystem flags.
+ *
+ * The FS_UNCLEAN flag is set by the kernel when the filesystem was
+ * mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates
+ * that the filesystem should be managed by the soft updates code.
+ * Note that the FS_NEEDSFSCK flag is set and cleared only by the
+ * fsck utility. It is set when background fsck finds an unexpected
+ * inconsistency which requires a traditional foreground fsck to be
+ * run. Such inconsistencies should only be found after an uncorrectable
+ * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
+ * it has successfully cleaned up the filesystem. The kernel uses this
+ * flag to enforce that inconsistent filesystems be mounted read-only.
+ * The FS_INDEXDIRS flag when set indicates that the kernel maintains
+ * on-disk auxiliary indexes (such as B-trees) for speeding directory
+ * accesses. Kernels that do not support auxiliary indicies clear the
+ * flag to indicate that the indicies need to be rebuilt (by fsck) before
+ * they can be used.
+ *
+ * FS_ACLS indicates that ACLs are administratively enabled for the
+ * file system, so they should be loaded from extended attributes,
+ * observed for access control purposes, and be administered by object
+ * owners. FS_MULTILABEL indicates that the TrustedBSD MAC Framework
+ * should attempt to back MAC labels into extended attributes on the
+ * file system rather than maintain a single mount label for all
+ * objects.
+ */
+#define FS_UNCLEAN 0x01 /* filesystem not clean at mount */
+#define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
+#define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
+#define FS_INDEXDIRS 0x08 /* kernel supports indexed directories */
+#define FS_ACLS 0x10 /* file system has ACLs enabled */
+#define FS_MULTILABEL 0x20 /* file system is MAC multi-label */
+#define FS_GJOURNAL 0x40 /* gjournaled file system */
+#define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
+
+/*
+ * Macros to access bits in the fs_active array.
+ */
+#define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))])
+#define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int))))
+#define ACTIVESET(fs, cg) do { \
+ if ((fs)->fs_active) \
+ ACTIVECGNUM((fs), (cg)) |= ACTIVECGOFF((cg)); \
+} while (0)
+#define ACTIVECLEAR(fs, cg) do { \
+ if ((fs)->fs_active) \
+ ACTIVECGNUM((fs), (cg)) &= ~ACTIVECGOFF((cg)); \
+} while (0)
+
+/*
+ * The size of a cylinder group is calculated by CGSIZE. The maximum size
+ * is limited by the fact that cylinder groups are at most one block.
+ * Its size is derived from the size of the maps maintained in the
+ * cylinder group and the (struct cg) size.
+ */
+#define CGSIZE(fs) \
+ /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
+ /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
+ /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \
+ /* inode map */ howmany((fs)->fs_ipg, NBBY) + \
+ /* block map */ howmany((fs)->fs_fpg, NBBY) +\
+ /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
+ /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
+ /* cluster map */ howmany(fragstoblks(fs, (fs)->fs_fpg), NBBY)))
+
+/*
+ * The minimal number of cylinder groups that should be created.
+ */
+#define MINCYLGRPS 4
+
+/*
+ * Convert cylinder group to base address of its global summary info.
+ */
+#define fs_cs(fs, indx) fs_csp[indx]
+
+/*
+ * Cylinder group block for a filesystem.
+ */
+#define CG_MAGIC 0x090255
+struct cg {
+ int32_t cg_firstfield; /* historic cyl groups linked list */
+ int32_t cg_magic; /* magic number */
+ int32_t cg_old_time; /* time last written */
+ int32_t cg_cgx; /* we are the cgx'th cylinder group */
+ int16_t cg_old_ncyl; /* number of cyl's this cg */
+ int16_t cg_old_niblk; /* number of inode blocks this cg */
+ int32_t cg_ndblk; /* number of data blocks this cg */
+ struct csum cg_cs; /* cylinder summary information */
+ int32_t cg_rotor; /* position of last used block */
+ int32_t cg_frotor; /* position of last used frag */
+ int32_t cg_irotor; /* position of last used inode */
+ int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
+ int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
+ int32_t cg_old_boff; /* (u_int16) free block positions */
+ int32_t cg_iusedoff; /* (u_int8) used inode map */
+ int32_t cg_freeoff; /* (u_int8) free block map */
+ int32_t cg_nextfreeoff; /* (u_int8) next available space */
+ int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
+ int32_t cg_clusteroff; /* (u_int8) free cluster map */
+ int32_t cg_nclusterblks; /* number of clusters this cg */
+ int32_t cg_niblk; /* number of inode blocks this cg */
+ int32_t cg_initediblk; /* last initialized inode */
+ int32_t cg_unrefs; /* number of unreferenced inodes */
+ int32_t cg_sparecon32[2]; /* reserved for future use */
+ ufs_time_t cg_time; /* time last written */
+ int64_t cg_sparecon64[3]; /* reserved for future use */
+ u_int8_t cg_space[1]; /* space for cylinder group maps */
+/* actually longer */
+};
+
+/*
+ * Macros for access to cylinder group array structures
+ */
+#define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC)
+#define cg_inosused(cgp) \
+ ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff))
+#define cg_blksfree(cgp) \
+ ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff))
+#define cg_clustersfree(cgp) \
+ ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff))
+#define cg_clustersum(cgp) \
+ ((int32_t *)((uintptr_t)(cgp) + (cgp)->cg_clustersumoff))
+
+/*
+ * Turn filesystem block numbers into disk block addresses.
+ * This maps filesystem blocks to device size blocks.
+ */
+#define fsbtodb(fs, b) ((daddr_t)(b) << (fs)->fs_fsbtodb)
+#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
+
+/*
+ * Cylinder group macros to locate things in cylinder groups.
+ * They calc filesystem addresses of cylinder group data structures.
+ */
+#define cgbase(fs, c) (((ufs2_daddr_t)(fs)->fs_fpg) * (c))
+#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
+#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
+#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
+#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
+#define cgstart(fs, c) \
+ ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \
+ (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))))
+
+/*
+ * Macros for handling inode numbers:
+ * inode number to filesystem block offset.
+ * inode number to cylinder group number.
+ * inode number to filesystem block address.
+ */
+#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
+#define ino_to_fsba(fs, x) \
+ ((ufs2_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
+ (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
+#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
+
+/*
+ * Give cylinder group number for a filesystem block.
+ * Give cylinder group block number for a filesystem block.
+ */
+#define dtog(fs, d) ((d) / (fs)->fs_fpg)
+#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
+
+/*
+ * Extract the bits for a block from a map.
+ * Compute the cylinder and rotational position of a cyl block addr.
+ */
+#define blkmap(fs, map, loc) \
+ (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
+
+/*
+ * The following macros optimize certain frequently calculated
+ * quantities by using shifts and masks in place of divisions
+ * modulos and multiplications.
+ */
+#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
+ ((loc) & (fs)->fs_qbmask)
+#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
+ ((loc) & (fs)->fs_qfmask)
+#define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \
+ (((off_t)(frag)) << (fs)->fs_fshift)
+#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
+ (((off_t)(blk)) << (fs)->fs_bshift)
+/* Use this only when `blk' is known to be small, e.g., < NDADDR. */
+#define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
+ ((blk) << (fs)->fs_bshift)
+#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
+ ((loc) >> (fs)->fs_bshift)
+#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
+ ((loc) >> (fs)->fs_fshift)
+#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
+ (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
+#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
+ (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
+#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
+ ((frags) >> (fs)->fs_fragshift)
+#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
+ ((blks) << (fs)->fs_fragshift)
+#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
+ ((fsb) & ((fs)->fs_frag - 1))
+#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
+ ((fsb) & ~((fs)->fs_frag - 1))
+
+/*
+ * Determine the number of available frags given a
+ * percentage to hold in reserve.
+ */
+#define freespace(fs, percentreserved) \
+ (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
+ (fs)->fs_cstotal.cs_nffree - \
+ (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
+
+/*
+ * Determining the size of a file block in the filesystem.
+ */
+#define blksize(fs, ip, lbn) \
+ (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
+ ? (fs)->fs_bsize \
+ : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
+#define sblksize(fs, size, lbn) \
+ (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
+ ? (fs)->fs_bsize \
+ : (fragroundup(fs, blkoff(fs, (size)))))
+
+
+/*
+ * Number of inodes in a secondary storage block/fragment.
+ */
+#define INOPB(fs) ((fs)->fs_inopb)
+#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
+
+/*
+ * Number of indirects in a filesystem block.
+ */
+#define NINDIR(fs) ((fs)->fs_nindir)
+
+extern int inside[], around[];
+extern u_char *fragtbl[];
+
+#endif
- --
Stanislav Sedov
ST4096-RIPE
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