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minix/usr.sbin/mkfs.mfs/mkfs.c
Qi Yong 61f6e2f5f0 fix some comment typo's 
Change-Id: Ic9f4333613abb858bfc28f72685424557cf2cd40
2013-05-26 14:12:54 +00:00

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/* mkfs - make the MINIX filesystem Authors: Tanenbaum et al. */
/* Authors: Andy Tanenbaum, Paul Ogilvie, Frans Meulenbroeks, Bruce Evans */
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/stat.h>
#if defined(__minix)
#include <minix/minlib.h>
#include <minix/partition.h>
#include <minix/u64.h>
#include <sys/ioctl.h>
#elif defined(__linux__)
#include <mntent.h>
#endif
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
/* Definition of the file system layout: */
#include "const.h"
#include "type.h"
#include "mfsdir.h"
#include "super.h"
#define INODE_MAP START_BLOCK
/* inode zone indexes pointing to single and double indirect zones */
#define S_INDIRECT_IDX (NR_DZONES)
#define D_INDIRECT_IDX (NR_DZONES+1)
#define MAX_TOKENS 10
#define LINE_LEN 200
/* XXX why do we not use 0 / SU_ID ? */
#define BIN 2
#define BINGRP 2
#if !defined(__minix)
#define mul64u(a,b) ((uint64_t)(a) * (b))
#define lseek64(a,b,c,d) lseek(a,b,c)
#endif
/* some Minix specific types that do not conflict with Posix */
#ifndef block_t
typedef uint32_t block_t; /* block number */
#endif
#ifndef zone_t
typedef uint32_t zone_t; /* zone number */
#endif
#ifndef bit_t
typedef uint32_t bit_t; /* bit number in a bit map */
#endif
#ifndef bitchunk_t
typedef uint32_t bitchunk_t; /* collection of bits in a bitmap */
#endif
struct fs_size {
ino_t inocount; /* amount of inodes */
zone_t zonecount; /* amount of zones */
block_t blockcount; /* amount of blocks */
};
extern char *optarg;
extern int optind;
block_t nrblocks;
int zone_per_block, zone_shift = 0;
zone_t next_zone, zoff, nr_indirzones;
int inodes_per_block, indir_per_block, indir_per_zone;
unsigned int zone_size;
ino_t nrinodes, inode_offset, next_inode;
int lct = 0, fd, print = 0;
int simple = 0, dflag = 0, verbose = 0;
int donttest; /* skip test if it fits on medium */
char *progname;
time_t current_time;
char *zero;
unsigned char *umap_array; /* bit map tells if block read yet */
size_t umap_array_elements;
block_t zone_map; /* where is zone map? (depends on # inodes) */
#ifndef MFS_STATIC_BLOCK_SIZE
size_t block_size;
#else
#define block_size MFS_STATIC_BLOCK_SIZE
#endif
FILE *proto;
int main(int argc, char **argv);
void detect_fs_size(struct fs_size * fssize);
void sizeup_dir(struct fs_size * fssize);
block_t sizeup(char *device);
static int bitmapsize(bit_t nr_bits, size_t blk_size);
void super(zone_t zones, ino_t inodes);
void rootdir(ino_t inode);
void enter_symlink(ino_t inode, char *link);
int dir_try_enter(zone_t z, ino_t child, char const *name);
void eat_dir(ino_t parent);
void eat_file(ino_t inode, int f);
void enter_dir(ino_t parent, char const *name, ino_t child);
void add_zone(ino_t n, zone_t z, size_t bytes, time_t cur_time);
void incr_link(ino_t n);
void incr_size(ino_t n, size_t count);
static ino_t alloc_inode(int mode, int usrid, int grpid);
static zone_t alloc_zone(void);
void insert_bit(block_t block, bit_t bit);
int mode_con(char *p);
void get_line(char line[LINE_LEN], char *parse[MAX_TOKENS]);
void check_mtab(const char *devname);
time_t file_time(int f);
__dead void pexit(char const *s, ...) __printflike(1,2);
void *alloc_block(void);
void print_fs(void);
int read_and_set(block_t n);
void special(char *string);
__dead void usage(void);
void get_block(block_t n, void *buf);
void get_super_block(void *buf);
void put_block(block_t n, void *buf);
/*================================================================
* mkfs - make filesystem
*===============================================================*/
int
main(int argc, char *argv[])
{
int nread, mode, usrid, grpid, ch, extra_space_percent;
block_t blocks, maxblocks, bblocks;
ino_t inodes, root_inum;
char *token[MAX_TOKENS], line[LINE_LEN], *sfx;
struct fs_size fssize;
progname = argv[0];
/* Process switches. */
blocks = 0;
inodes = 0;
bblocks = 0;
#ifndef MFS_STATIC_BLOCK_SIZE
block_size = 0;
#endif
zone_shift = 0;
extra_space_percent = 0;
while ((ch = getopt(argc, argv, "B:b:di:ltvx:z:")) != EOF)
switch (ch) {
#ifndef MFS_STATIC_BLOCK_SIZE
case 'B':
block_size = strtoul(optarg, &sfx, 0);
switch(*sfx) {
case 'b': case 'B': /* bytes; NetBSD-compatible */
case '\0': break;
case 'K':
case 'k': block_size*=1024; break;
case 's': block_size*=SECTOR_SIZE; break;
default: usage();
}
break;
#else
case 'B':
if (block_size != strtoul(optarg, (char **) NULL, 0))
errx(4, "block size must be exactly %d bytes",
MFS_STATIC_BLOCK_SIZE);
break;
(void)sfx; /* shut up warnings about unused variable...*/
#endif
case 'b':
blocks = bblocks = strtoul(optarg, (char **) NULL, 0);
break;
case 'd':
dflag = 1;
break;
case 'i':
inodes = strtoul(optarg, (char **) NULL, 0);
break;
case 'l': print = 1; break;
case 't': donttest = 1; break;
case 'v': ++verbose; break;
case 'x': extra_space_percent = atoi(optarg); break;
case 'z': zone_shift = atoi(optarg); break;
default: usage();
}
if (argc == optind) usage();
/* Get the current time, set it to the mod time of the binary of
* mkfs itself when the -d flag is used. The 'current' time is put into
* the i_mtimes of all the files. This -d feature is useful when
* producing a set of file systems, and one wants all the times to be
* identical. First you set the time of the mkfs binary to what you
* want, then go.
*/
current_time = time((time_t *) 0); /* time mkfs is being run */
if(dflag) {
struct stat statbuf;
if (stat(progname, &statbuf)) {
perror("stat of itself");
} else current_time = statbuf.st_mtime;
}
/* Percentage of extra size must be nonnegative.
* It can legitimately be bigger than 100 but has to make some sort of sense.
*/
if(extra_space_percent < 0 || extra_space_percent > 2000) usage();
#ifdef DEFAULT_BLOCK_SIZE
if(!block_size) block_size = DEFAULT_BLOCK_SIZE;
#endif
if (block_size % SECTOR_SIZE)
errx(4, "block size must be multiple of sector (%d bytes)", SECTOR_SIZE);
#ifdef MIN_BLOCK_SIZE
if (block_size < MIN_BLOCK_SIZE)
errx(4, "block size must be at least %d bytes", MIN_BLOCK_SIZE);
#endif
#ifdef MAX_BLOCK_SIZE
if (block_size > MAX_BLOCK_SIZE)
errx(4, "block size must be at most %d bytes", MAX_BLOCK_SIZE);
#endif
if(block_size%INODE_SIZE)
errx(4, "block size must be a multiple of inode size (%d bytes)", INODE_SIZE);
if(zone_shift < 0 || zone_shift > 14)
errx(4, "zone_shift must be a small non-negative integer");
zone_per_block = 1 << zone_shift; /* nr of blocks per zone */
inodes_per_block = INODES_PER_BLOCK(block_size);
indir_per_block = INDIRECTS(block_size);
indir_per_zone = INDIRECTS(block_size) << zone_shift;
/* number of file zones we can address directly and with a single indirect*/
nr_indirzones = NR_DZONES + indir_per_zone;
zone_size = block_size << zone_shift;
/* Checks for an overflow: only with very big block size */
if (zone_size <= 0)
errx(4, "Zones are too big for this program; smaller -B or -z, please!");
/* now that the block size is known, do buffer allocations where
* possible.
*/
zero = alloc_block();
/* Determine the size of the device if not specified as -b or proto. */
maxblocks = sizeup(argv[optind]);
if (bblocks != 0 && bblocks > maxblocks){
errx(4, "Given size -b %d exeeds device capacity(%d)\n", bblocks, maxblocks);
}
if (argc - optind == 1 && bblocks == 0) {
blocks = maxblocks;
/* blocks == 0 is checked later, but leads to a funny way of
* reporting a 0-sized device (displays usage).
*/
if(blocks < 1) {
errx(1, "zero size device.");
}
}
/* The remaining args must be 'special proto', or just 'special' if the
* no. of blocks has already been specified.
*/
if (argc - optind != 2 && (argc - optind != 1 || blocks == 0)) usage();
if (maxblocks && blocks > maxblocks) {
errx(1, "%s: number of blocks too large for device.", argv[optind]);
}
/* Check special. */
check_mtab(argv[optind]);
/* Check and start processing proto. */
optarg = argv[++optind];
if (optind < argc && (proto = fopen(optarg, "r")) != NULL) {
/* Prototype file is readable. */
lct = 1;
get_line(line, token); /* skip boot block info */
/* Read the line with the block and inode counts. */
get_line(line, token);
if (bblocks == 0){
blocks = strtol(token[0], (char **) NULL, 10);
} else {
if(bblocks < strtol(token[0], (char **) NULL, 10)) {
errx(1, "%s: number of blocks given as parameter(%d)"
" is too small for given proto file(%d).",
argv[optind], bblocks,
strtol(token[0], (char **) NULL, 10));
};
}
inodes = strtol(token[1], (char **) NULL, 10);
/* Process mode line for root directory. */
get_line(line, token);
mode = mode_con(token[0]);
usrid = atoi(token[1]);
grpid = atoi(token[2]);
if(blocks <= 0 && inodes <= 0){
detect_fs_size(&fssize);
blocks = fssize.blockcount;
inodes = fssize.inocount;
blocks += blocks*extra_space_percent/100;
inodes += inodes*extra_space_percent/100;
/* XXX is it OK to write on stdout? Use warn() instead? Also consider using verbose */
printf("dynamically sized filesystem: %u blocks, %u inodes\n",
(unsigned int) blocks, (unsigned int) inodes);
}
} else {
lct = 0;
if (optind < argc) {
/* Maybe the prototype file is just a size. Check. */
blocks = strtoul(optarg, (char **) NULL, 0);
if (blocks == 0) errx(2, "Can't open prototype file");
}
/* Make simple file system of the given size, using defaults. */
mode = 040777;
usrid = BIN;
grpid = BINGRP;
simple = 1;
}
if (inodes == 0) {
long long kb = ((unsigned long long)blocks*block_size) / 1024;
inodes = kb / 2;
if (kb >= 100000) inodes = kb / 4;
if (kb >= 1000000) inodes = kb / 6;
if (kb >= 10000000) inodes = kb / 8;
if (kb >= 100000000) inodes = kb / 10;
if (kb >= 1000000000) inodes = kb / 12;
/* XXX check overflow: with very large number of blocks, this results in insanely large number of inodes */
/* XXX check underflow (if/when ino_t is signed), else the message below will look strange */
/* round up to fill inode block */
inodes += inodes_per_block - 1;
inodes = inodes / inodes_per_block * inodes_per_block;
}
if (blocks < 5) errx(1, "Block count too small");
if (inodes < 1) errx(1, "Inode count too small");
nrblocks = blocks;
nrinodes = inodes;
umap_array_elements = 1 + blocks/8;
if(!(umap_array = malloc(umap_array_elements)))
err(1, "can't allocate block bitmap (%u bytes).",
(unsigned)umap_array_elements);
/* Open special. */
special(argv[--optind]);
if (!donttest) {
uint16_t *testb;
ssize_t w;
testb = alloc_block();
/* Try writing the last block of partition or diskette. */
if(lseek64(fd, mul64u(blocks - 1, block_size), SEEK_SET, NULL) < 0) {
err(1, "couldn't seek to last block to test size (1)");
}
testb[0] = 0x3245;
testb[1] = 0x11FF;
testb[block_size/2-1] = 0x1F2F;
if ((w=write(fd, testb, block_size)) != block_size)
err(1, "File system is too big for minor device (write1 %d/%u)",
w, block_size);
sync(); /* flush write, so if error next read fails */
if(lseek64(fd, mul64u(blocks - 1, block_size), SEEK_SET, NULL) < 0) {
err(1, "couldn't seek to last block to test size (2)");
}
testb[0] = 0;
testb[1] = 0;
testb[block_size/2-1] = 0;
nread = read(fd, testb, block_size);
if (nread != block_size || testb[0] != 0x3245 || testb[1] != 0x11FF ||
testb[block_size/2-1] != 0x1F2F) {
warn("nread = %d\n", nread);
warnx("testb = 0x%x 0x%x 0x%x\n",
testb[0], testb[1], testb[block_size-1]);
errx(1, "File system is too big for minor device (read)");
}
lseek64(fd, mul64u(blocks - 1, block_size), SEEK_SET, NULL);
testb[0] = 0;
testb[1] = 0;
testb[block_size/2-1] = 0;
if (write(fd, testb, block_size) != block_size)
err(1, "File system is too big for minor device (write2)");
lseek(fd, 0L, SEEK_SET);
free(testb);
}
/* Make the file-system */
put_block(BOOT_BLOCK, zero); /* Write a null boot block. */
put_block(BOOT_BLOCK+1, zero); /* Write another null block. */
super(nrblocks >> zone_shift, inodes);
root_inum = alloc_inode(mode, usrid, grpid);
rootdir(root_inum);
if (simple == 0) eat_dir(root_inum);
if (print) print_fs();
else if (verbose > 1) {
if (zone_shift)
fprintf(stderr, "%d inodes used. %u zones (%u blocks) used.\n",
(int)next_inode-1, next_zone, next_zone*zone_per_block);
else
fprintf(stderr, "%d inodes used. %u zones used.\n",
(int)next_inode-1, next_zone);
}
return(0);
/* NOTREACHED */
} /* end main */
/*================================================================
* detect_fs_size - determine image size dynamically
*===============================================================*/
void
detect_fs_size(struct fs_size * fssize)
{
int prev_lct = lct;
off_t point = ftell(proto);
block_t initb;
zone_t initz;
fssize->inocount = 1; /* root directory node */
fssize->zonecount = 0;
fssize->blockcount = 0;
sizeup_dir(fssize);
initb = bitmapsize(1 + fssize->inocount, block_size);
initb += bitmapsize(fssize->zonecount, block_size);
initb += START_BLOCK;
initb += (fssize->inocount + inodes_per_block - 1) / inodes_per_block;
initz = (initb + zone_per_block - 1) >> zone_shift;
fssize->blockcount = initb+ fssize->zonecount;
lct = prev_lct;
fseek(proto, point, SEEK_SET);
}
void
sizeup_dir(struct fs_size * fssize)
{
char *token[MAX_TOKENS], *p;
char line[LINE_LEN];
FILE *f;
off_t size;
int dir_entries = 2;
zone_t dir_zones = 0, fzones, indirects;
while (1) {
get_line(line, token);
p = token[0];
if (*p == '$') {
dir_zones = (dir_entries / (NR_DIR_ENTRIES(block_size) * zone_per_block));
if(dir_entries % (NR_DIR_ENTRIES(block_size) * zone_per_block))
dir_zones++;
if(dir_zones > NR_DZONES)
dir_zones++; /* Max single indir */
fssize->zonecount += dir_zones;
return;
}
p = token[1];
fssize->inocount++;
dir_entries++;
if (*p == 'd') {
sizeup_dir(fssize);
} else if (*p == 'b' || *p == 'c') {
} else if (*p == 's') {
fssize->zonecount++; /* Symlink contents is always stored a block */
} else {
if ((f = fopen(token[4], "rb")) == NULL) {
pexit("dynamic size detection failed: can't open %s",
token[4]);
} else if (fseek(f, 0, SEEK_END) < 0) {
pexit("dynamic size detection failed: seek to end of %s",
token[4]);
} else if ( (size = ftell(f)) == (off_t)(-1)) {
pexit("dynamic size detection failed: can't tell size of %s",
token[4]);
} else {
fclose(f);
fzones = roundup(size, zone_size) / zone_size;
indirects = 0;
/* XXX overflow? fzones is u32, size is potentially 64-bit */
if (fzones > NR_DZONES)
indirects++; /* single indirect needed */
if (fzones > nr_indirzones) {
/* Each further group of 'indir_per_zone'
* needs one supplementary indirect zone:
*/
indirects += roundup(fzones - nr_indirzones,
indir_per_zone) / indir_per_zone;
indirects++; /* + double indirect needed!*/
}
fssize->zonecount += fzones + indirects;
}
}
}
}
/*================================================================
* sizeup - determine device size
*===============================================================*/
block_t
sizeup(char * device)
{
block_t d;
#if defined(__minix)
u64_t bytes, resize;
u32_t rem;
#else
off_t size;
#endif
if ((fd = open(device, O_RDONLY)) == -1) {
if (errno != ENOENT)
perror("sizeup open");
return 0;
}
#if defined(__minix)
if(minix_sizeup(device, &bytes) < 0) {
perror("sizeup");
return 0;
}
d = div64u(bytes, block_size);
rem = rem64u(bytes, block_size);
resize = add64u(mul64u(d, block_size), rem);
if(cmp64(resize, bytes) != 0) {
/* Assume block_t is unsigned */
d = (block_t)(-1ul);
fprintf(stderr, "%s: truncating FS at %lu blocks\n",
progname, (unsigned long)d);
}
#else
size = lseek(fd, 0, SEEK_END);
if (size == (off_t) -1)
err(1, "cannot get device size fd=%d: %s", fd, device);
/* Assume block_t is unsigned */
if (size / block_size > (block_t)(-1ul)) {
d = (block_t)(-1ul);
fprintf(stderr, "%s: truncating FS at %lu blocks\n",
progname, (unsigned long)d);
} else
d = size / block_size;
#endif
return d;
}
/*
* copied from fslib
*/
static int
bitmapsize(bit_t nr_bits, size_t blk_size)
{
block_t nr_blocks;
nr_blocks = nr_bits / FS_BITS_PER_BLOCK(blk_size);
if (nr_blocks * FS_BITS_PER_BLOCK(blk_size) < nr_bits)
++nr_blocks;
return(nr_blocks);
}
/*================================================================
* super - construct a superblock
*===============================================================*/
void
super(zone_t zones, ino_t inodes)
{
block_t inodeblks, initblks, i;
unsigned long nb;
long long ind_per_zone, zo;
void *buf;
struct super_block *sup;
sup = buf = alloc_block();
#ifdef MFSFLAG_CLEAN
/* The assumption is that mkfs will create a clean FS. */
sup->s_flags = MFSFLAG_CLEAN;
#endif
sup->s_ninodes = inodes;
/* Check for overflow; cannot happen on V3 file systems */
if(inodes != sup->s_ninodes)
errx(1, "Too much inodes for that version of Minix FS.");
sup->s_nzones = 0; /* not used in V2 - 0 forces errors early */
sup->s_zones = zones;
/* Check for overflow; can only happen on V1 file systems */
if(zones != sup->s_zones)
errx(1, "Too much zones (blocks) for that version of Minix FS.");
#ifndef MFS_STATIC_BLOCK_SIZE
#define BIGGERBLOCKS "Please try a larger block size for an FS of this size."
#else
#define BIGGERBLOCKS "Please use MinixFS V3 for an FS of this size."
#endif
sup->s_imap_blocks = nb = bitmapsize(1 + inodes, block_size);
/* Checks for an overflow: nb is uint32_t while s_imap_blocks is of type
* int16_t */
if(sup->s_imap_blocks != nb) {
errx(1, "too many inode bitmap blocks.\n" BIGGERBLOCKS);
}
sup->s_zmap_blocks = nb = bitmapsize(zones, block_size);
/* Idem here check for overflow */
if(nb != sup->s_zmap_blocks) {
errx(1, "too many block bitmap blocks.\n" BIGGERBLOCKS);
}
inode_offset = START_BLOCK + sup->s_imap_blocks + sup->s_zmap_blocks;
inodeblks = (inodes + inodes_per_block - 1) / inodes_per_block;
initblks = inode_offset + inodeblks;
sup->s_firstdatazone_old = nb =
(initblks + (1 << zone_shift) - 1) >> zone_shift;
if(nb >= zones) errx(1, "bit maps too large");
if(nb != sup->s_firstdatazone_old) {
/* The field is too small to store the value. Fortunately, the value
* can be computed from other fields. We set the on-disk field to zero
* to indicate that it must not be used. Eventually, we can always set
* the on-disk field to zero, and stop using it.
*/
sup->s_firstdatazone_old = 0;
}
sup->s_firstdatazone = nb;
zoff = sup->s_firstdatazone - 1;
sup->s_log_zone_size = zone_shift;
sup->s_magic = SUPER_MAGIC;
#ifdef MFS_SUPER_BLOCK_SIZE
sup->s_block_size = block_size;
/* Check for overflow */
if(block_size != sup->MFS_SUPER_BLOCK_SIZE)
errx(1, "block_size too large.");
sup->s_disk_version = 0;
#endif
ind_per_zone = (long long) indir_per_zone;
zo = NR_DZONES + ind_per_zone + ind_per_zone*ind_per_zone;
#ifndef MAX_MAX_SIZE
#define MAX_MAX_SIZE (INT32_MAX)
#endif
if(MAX_MAX_SIZE/block_size < zo) {
sup->s_max_size = MAX_MAX_SIZE;
}
else {
sup->s_max_size = zo * block_size;
}
if (verbose>1) {
fprintf(stderr, "Super block values:\n"
"\tnumber of inodes\t%12d\n"
"\tnumber of zones \t%12d\n"
"\tinode bit map blocks\t%12d\n"
"\tzone bit map blocks\t%12d\n"
"\tfirst data zone \t%12d\n"
"\tblocks per zone shift\t%12d\n"
"\tmaximum file size\t%12d\n"
"\tmagic number\t\t%#12X\n",
sup->s_ninodes, sup->s_zones,
sup->s_imap_blocks, sup->s_zmap_blocks, sup->s_firstdatazone,
sup->s_log_zone_size, sup->s_max_size, sup->s_magic);
#ifdef MFS_SUPER_BLOCK_SIZE
fprintf(stderr, "\tblock size\t\t%12d\n", sup->s_block_size);
#endif
}
if (lseek(fd, (off_t) SUPER_BLOCK_BYTES, SEEK_SET) == (off_t) -1)
err(1, "super() couldn't seek");
if (write(fd, buf, SUPER_BLOCK_BYTES) != SUPER_BLOCK_BYTES)
err(1, "super() couldn't write");
/* Clear maps and inodes. */
for (i = START_BLOCK; i < initblks; i++) put_block((block_t) i, zero);
next_zone = sup->s_firstdatazone;
next_inode = 1;
zone_map = INODE_MAP + sup->s_imap_blocks;
insert_bit(zone_map, 0); /* bit zero must always be allocated */
insert_bit((block_t) INODE_MAP, 0); /* inode zero not used but
* must be allocated */
free(buf);
}
/*================================================================
* rootdir - install the root directory
*===============================================================*/
void
rootdir(ino_t inode)
{
zone_t z;
z = alloc_zone();
add_zone(inode, z, 2 * sizeof(struct direct), current_time);
enter_dir(inode, ".", inode);
enter_dir(inode, "..", inode);
incr_link(inode);
incr_link(inode);
}
void
enter_symlink(ino_t inode, char *lnk)
{
zone_t z;
size_t len;
char *buf;
buf = alloc_block();
z = alloc_zone();
len = strlen(lnk);
if (len >= block_size)
pexit("symlink too long, max length is %u", (unsigned)block_size - 1);
strcpy(buf, lnk);
put_block((z << zone_shift), buf);
add_zone(inode, z, len, current_time);
free(buf);
}
/*================================================================
* eat_dir - recursively install directory
*===============================================================*/
void
eat_dir(ino_t parent)
{
/* Read prototype lines and set up directory. Recurse if need be. */
char *token[MAX_TOKENS], *p;
char line[LINE_LEN];
int mode, usrid, grpid, maj, min, f;
ino_t n;
zone_t z;
size_t size;
while (1) {
get_line(line, token);
p = token[0];
if (*p == '$') return;
p = token[1];
mode = mode_con(p);
usrid = atoi(token[2]);
grpid = atoi(token[3]);
n = alloc_inode(mode, usrid, grpid);
/* Enter name in directory and update directory's size. */
enter_dir(parent, token[0], n);
incr_size(parent, sizeof(struct direct));
/* Check to see if file is directory or special. */
incr_link(n);
if (*p == 'd') {
/* This is a directory. */
z = alloc_zone(); /* zone for new directory */
add_zone(n, z, 2 * sizeof(struct direct), current_time);
enter_dir(n, ".", n);
enter_dir(n, "..", parent);
incr_link(parent);
incr_link(n);
eat_dir(n);
} else if (*p == 'b' || *p == 'c') {
/* Special file. */
maj = atoi(token[4]);
min = atoi(token[5]);
size = 0;
if (token[6]) size = atoi(token[6]);
size = block_size * size;
add_zone(n, (zone_t) (makedev(maj,min)), size, current_time);
} else if (*p == 's') {
enter_symlink(n, token[4]);
} else {
/* Regular file. Go read it. */
if ((f = open(token[4], O_RDONLY)) < 0) {
fprintf(stderr, "%s: Can't open %s: %s\n",
progname, token[4], strerror(errno));
} else {
eat_file(n, f);
}
}
}
}
/*================================================================
* eat_file - copy file to MINIX
*===============================================================*/
/* Zonesize >= blocksize */
void
eat_file(ino_t inode, int f)
{
int ct = 0, i, j;
zone_t z = 0;
char *buf;
time_t timeval;
buf = alloc_block();
do {
for (i = 0, j = 0; i < zone_per_block; i++, j += ct) {
memset(buf, 0, block_size);
if ((ct = read(f, buf, block_size)) > 0) {
if (i == 0) z = alloc_zone();
put_block((z << zone_shift) + i, buf);
}
}
timeval = (dflag ? current_time : file_time(f));
if (ct) add_zone(inode, z, (size_t) j, timeval);
} while (ct == block_size);
close(f);
free(buf);
}
int
dir_try_enter(zone_t z, ino_t child, char const *name)
{
struct direct *dir_entry = alloc_block();
int r = 0;
block_t b;
int i, l;
b = z << zone_shift;
for (l = 0; l < zone_per_block; l++, b++) {
get_block(b, dir_entry);
for (i = 0; i < NR_DIR_ENTRIES(block_size); i++)
if (!dir_entry[i].d_ino)
break;
if(i < NR_DIR_ENTRIES(block_size)) {
r = 1;
dir_entry[i].d_ino = child;
assert(sizeof(dir_entry[i].d_name) == MFS_DIRSIZ);
if (verbose && strlen(name) > MFS_DIRSIZ)
fprintf(stderr, "File name %s is too long, truncated\n", name);
strncpy(dir_entry[i].d_name, name, MFS_DIRSIZ);
put_block(b, dir_entry);
break;
}
}
free(dir_entry);
return r;
}
/*================================================================
* directory & inode management assist group
*===============================================================*/
void
enter_dir(ino_t parent, char const *name, ino_t child)
{
/* Enter child in parent directory */
/* Works for dir > 1 block and zone > block */
unsigned int k;
block_t b, indir;
zone_t z;
int off;
struct inode *ino;
struct inode *inoblock = alloc_block();
zone_t *indirblock = alloc_block();
assert(!(block_size % sizeof(struct direct)));
/* Obtain the inode structure */
b = ((parent - 1) / inodes_per_block) + inode_offset;
off = (parent - 1) % inodes_per_block;
get_block(b, inoblock);
ino = inoblock + off;
for (k = 0; k < NR_DZONES; k++) {
z = ino->i_zone[k];
if (z == 0) {
z = alloc_zone();
ino->i_zone[k] = z;
}
if(dir_try_enter(z, child, __UNCONST(name))) {
put_block(b, inoblock);
free(inoblock);
free(indirblock);
return;
}
}
/* no space in directory using just direct blocks; try indirect */
if (ino->i_zone[S_INDIRECT_IDX] == 0)
ino->i_zone[S_INDIRECT_IDX] = alloc_zone();
indir = ino->i_zone[S_INDIRECT_IDX] << zone_shift;
--indir; /* Compensate for ++indir below */
for(k = 0; k < (indir_per_zone); k++) {
if (k % indir_per_block == 0)
get_block(++indir, indirblock);
z = indirblock[k % indir_per_block];
if(!z) {
z = indirblock[k % indir_per_block] = alloc_zone();
put_block(indir, indirblock);
}
if(dir_try_enter(z, child, __UNCONST(name))) {
put_block(b, inoblock);
free(inoblock);
free(indirblock);
return;
}
}
pexit("Directory-inode %u beyond single indirect blocks. Could not enter %s",
(unsigned)parent, name);
}
void
add_zone(ino_t n, zone_t z, size_t bytes, time_t mtime)
{
/* Add zone z to inode n. The file has grown by 'bytes' bytes. */
int off, i, j;
block_t b;
zone_t indir, dindir;
struct inode *p, *inode;
zone_t *blk, *dblk;
assert(inodes_per_block*sizeof(*inode) == block_size);
if(!(inode = alloc_block()))
err(1, "Couldn't allocate block of inodes");
b = ((n - 1) / inodes_per_block) + inode_offset;
off = (n - 1) % inodes_per_block;
get_block(b, inode);
p = &inode[off];
p->i_size += bytes;
p->i_mtime = mtime;
#ifndef MFS_INODE_ONLY_MTIME /* V1 file systems did not have them... */
p->i_atime = p->i_ctime = current_time;
#endif
for (i = 0; i < NR_DZONES; i++)
if (p->i_zone[i] == 0) {
p->i_zone[i] = z;
put_block(b, inode);
free(inode);
return;
}
assert(indir_per_block*sizeof(*blk) == block_size);
if(!(blk = alloc_block()))
err(1, "Couldn't allocate indirect block");
/* File has grown beyond a small file. */
if (p->i_zone[S_INDIRECT_IDX] == 0)
p->i_zone[S_INDIRECT_IDX] = alloc_zone();
indir = p->i_zone[S_INDIRECT_IDX] << zone_shift;
put_block(b, inode);
--indir; /* Compensate for ++indir below */
for (i = 0; i < (indir_per_zone); i++) {
if (i % indir_per_block == 0)
get_block(++indir, blk);
if (blk[i % indir_per_block] == 0) {
blk[i] = z;
put_block(indir, blk);
free(blk);
free(inode);
return;
}
}
/* File has grown beyond single indirect; we need a double indirect */
assert(indir_per_block*sizeof(*dblk) == block_size);
if(!(dblk = alloc_block()))
err(1, "Couldn't allocate double indirect block");
if (p->i_zone[D_INDIRECT_IDX] == 0)
p->i_zone[D_INDIRECT_IDX] = alloc_zone();
dindir = p->i_zone[D_INDIRECT_IDX] << zone_shift;
put_block(b, inode);
--dindir; /* Compensate for ++indir below */
for (j = 0; j < (indir_per_zone); j++) {
if (j % indir_per_block == 0)
get_block(++dindir, dblk);
if (dblk[j % indir_per_block] == 0)
dblk[j % indir_per_block] = alloc_zone();
indir = dblk[j % indir_per_block] << zone_shift;
--indir; /* Compensate for ++indir below */
for (i = 0; i < (indir_per_zone); i++) {
if (i % indir_per_block == 0)
get_block(++indir, blk);
if (blk[i % indir_per_block] == 0) {
blk[i] = z;
put_block(dindir, dblk);
put_block(indir, blk);
free(dblk);
free(blk);
free(inode);
return;
}
}
}
pexit("File has grown beyond double indirect");
}
/* Increment the link count to inode n */
void
incr_link(ino_t n)
{
int off;
static int enter = 0;
static struct inode *inodes = NULL;
block_t b;
if (enter++) pexit("internal error: recursive call to incr_link()");
b = ((n - 1) / inodes_per_block) + inode_offset;
off = (n - 1) % inodes_per_block;
{
assert(sizeof(*inodes) * inodes_per_block == block_size);
if(!inodes && !(inodes = alloc_block()))
err(1, "couldn't allocate a block of inodes");
get_block(b, inodes);
inodes[off].i_nlinks++;
/* Check overflow (particularly on V1)... */
if (inodes[off].i_nlinks <= 0)
pexit("Too many links to a directory");
put_block(b, inodes);
}
enter = 0;
}
/* Increment the file-size in inode n */
void
incr_size(ino_t n, size_t count)
{
block_t b;
int off;
b = ((n - 1) / inodes_per_block) + inode_offset;
off = (n - 1) % inodes_per_block;
{
struct inode *inodes;
assert(inodes_per_block * sizeof(*inodes) == block_size);
if(!(inodes = alloc_block()))
err(1, "couldn't allocate a block of inodes");
get_block(b, inodes);
/* Check overflow; avoid compiler spurious warnings */
if (inodes[off].i_size+(int)count < inodes[off].i_size ||
inodes[off].i_size > MAX_MAX_SIZE-(int)count)
pexit("File has become too big to be handled by MFS");
inodes[off].i_size += count;
put_block(b, inodes);
free(inodes);
}
}
/*================================================================
* allocation assist group
*===============================================================*/
static ino_t
alloc_inode(int mode, int usrid, int grpid)
{
ino_t num;
int off;
block_t b;
struct inode *inodes;
num = next_inode++;
if (num > nrinodes) {
pexit("File system does not have enough inodes (only %d)", nrinodes);
}
b = ((num - 1) / inodes_per_block) + inode_offset;
off = (num - 1) % inodes_per_block;
assert(inodes_per_block * sizeof(*inodes) == block_size);
if(!(inodes = alloc_block()))
err(1, "couldn't allocate a block of inodes");
get_block(b, inodes);
if (inodes[off].i_mode) {
pexit("allocation new inode %d with non-zero mode - this cannot happen",
num);
}
inodes[off].i_mode = mode;
inodes[off].i_uid = usrid;
inodes[off].i_gid = grpid;
if (verbose && (inodes[off].i_uid != usrid || inodes[off].i_gid != grpid))
fprintf(stderr, "Uid/gid %d.%d do not fit within inode, truncated\n", usrid, grpid);
put_block(b, inodes);
free(inodes);
/* Set the bit in the bit map. */
insert_bit((block_t) INODE_MAP, num);
return(num);
}
/* Allocate a new zone */
static zone_t
alloc_zone(void)
{
/* Works for zone > block */
block_t b;
int i;
zone_t z;
z = next_zone++;
b = z << zone_shift;
if (b > nrblocks - zone_per_block)
pexit("File system not big enough for all the files");
for (i = 0; i < zone_per_block; i++)
put_block(b + i, zero); /* give an empty zone */
insert_bit(zone_map, z - zoff);
return z;
}
/* Insert one bit into the bitmap */
void
insert_bit(block_t map, bit_t bit)
{
int boff, w, s;
unsigned int bits_per_block;
block_t map_block;
bitchunk_t *buf;
buf = alloc_block();
bits_per_block = FS_BITS_PER_BLOCK(block_size);
map_block = map + bit / bits_per_block;
if (map_block >= inode_offset)
pexit("insertbit invades inodes area - this cannot happen");
boff = bit % bits_per_block;
assert(boff >=0);
assert(boff < FS_BITS_PER_BLOCK(block_size));
get_block(map_block, buf);
w = boff / FS_BITCHUNK_BITS;
s = boff % FS_BITCHUNK_BITS;
buf[w] |= (1 << s);
put_block(map_block, buf);
free(buf);
}
/*================================================================
* proto-file processing assist group
*===============================================================*/
int mode_con(char *p)
{
/* Convert string to mode */
int o1, o2, o3, mode;
char c1, c2, c3;
c1 = *p++;
c2 = *p++;
c3 = *p++;
o1 = *p++ - '0';
o2 = *p++ - '0';
o3 = *p++ - '0';
mode = (o1 << 6) | (o2 << 3) | o3;
if (c1 == 'd') mode |= S_IFDIR;
if (c1 == 'b') mode |= S_IFBLK;
if (c1 == 'c') mode |= S_IFCHR;
if (c1 == 's') mode |= S_IFLNK;
if (c1 == 'l') mode |= S_IFLNK; /* just to be somewhat ls-compatible*/
/* XXX note: some other mkfs programs consider L to create hardlinks */
if (c1 == '-') mode |= S_IFREG;
if (c2 == 'u') mode |= S_ISUID;
if (c3 == 'g') mode |= S_ISGID;
/* XXX There are no way to encode S_ISVTX */
return(mode);
}
void
get_line(char line[LINE_LEN], char *parse[MAX_TOKENS])
{
/* Read a line and break it up in tokens */
int k;
char c, *p;
int d;
for (k = 0; k < MAX_TOKENS; k++) parse[k] = 0;
memset(line, 0, LINE_LEN);
k = 0;
p = line;
while (1) {
if (++k > LINE_LEN) pexit("Line too long");
d = fgetc(proto);
if (d == EOF) pexit("Unexpected end-of-file");
*p = d;
if (*p == ' ' || *p == '\t') *p = 0;
if (*p == '\n') {
lct++;
*p++ = 0;
*p = '\n';
break;
}
p++;
}
k = 0;
p = line;
while (1) {
c = *p++;
if (c == '\n') return;
if (c == 0) continue;
parse[k++] = p - 1;
do {
c = *p++;
} while (c != 0 && c != '\n');
}
}
/*================================================================
* other stuff
*===============================================================*/
/*
* Check to see if the special file named 'device' is mounted.
*/
void
check_mtab(const char *device) /* /dev/hd1 or whatever */
{
#if defined(__minix)
int n, r;
struct stat sb;
char dev[PATH_MAX], mount_point[PATH_MAX],
type[MNTNAMELEN], flags[MNTFLAGLEN];
r= stat(device, &sb);
if (r == -1)
{
if (errno == ENOENT)
return; /* Does not exist, and therefore not mounted. */
err(1, "stat %s failed", device);
}
if (!S_ISBLK(sb.st_mode))
{
/* Not a block device and therefore not mounted. */
return;
}
if (load_mtab(__UNCONST("mkfs")) < 0) return;
while (1) {
n = get_mtab_entry(dev, mount_point, type, flags);
if (n < 0) return;
if (strcmp(device, dev) == 0) {
/* Can't mkfs on top of a mounted file system. */
errx(1, "%s is mounted on %s", device, mount_point);
}
}
#elif defined(__linux__)
/* XXX: this code is copyright Theodore T'so and distributed under the GPLv2. Rewrite.
*/
struct mntent *mnt;
struct stat st_buf;
dev_t file_dev=0, file_rdev=0;
ino_t file_ino=0;
FILE *f;
int fd;
char *mtab_file = "/proc/mounts";
if ((f = setmntent (mtab_file, "r")) == NULL)
goto error;
if (stat(device, &st_buf) == 0) {
if (S_ISBLK(st_buf.st_mode)) {
file_rdev = st_buf.st_rdev;
} else {
file_dev = st_buf.st_dev;
file_ino = st_buf.st_ino;
}
}
while ((mnt = getmntent (f)) != NULL) {
if (strcmp(device, mnt->mnt_fsname) == 0)
break;
if (stat(mnt->mnt_fsname, &st_buf) == 0) {
if (S_ISBLK(st_buf.st_mode)) {
if (file_rdev && (file_rdev == st_buf.st_rdev))
break;
} else {
if (file_dev && ((file_dev == st_buf.st_dev) &&
(file_ino == st_buf.st_ino)))
break;
}
}
}
if (mnt == NULL) {
/*
* Do an extra check to see if this is the root device. We
* can't trust /etc/mtab, and /proc/mounts will only list
* /dev/root for the root filesystem. Argh. Instead we
* check if the given device has the same major/minor number
* as the device that the root directory is on.
*/
if (file_rdev && stat("/", &st_buf) == 0) {
if (st_buf.st_dev == file_rdev) {
goto is_root;
}
}
goto test_busy;
}
/* Validate the entry in case /etc/mtab is out of date */
/*
* We need to be paranoid, because some broken distributions
* (read: Slackware) don't initialize /etc/mtab before checking
* all of the non-root filesystems on the disk.
*/
if (stat(mnt->mnt_dir, &st_buf) < 0) {
if (errno == ENOENT) {
goto test_busy;
}
goto error;
}
if (file_rdev && (st_buf.st_dev != file_rdev)) {
goto error;
}
fprintf(stderr, "Device %s is mounted, exiting\n", device);
exit(-1);
/*
* Check to see if we're referring to the root filesystem.
* If so, do a manual check to see if we can open /etc/mtab
* read/write, since if the root is mounted read/only, the
* contents of /etc/mtab may not be accurate.
*/
if (!strcmp(mnt->mnt_dir, "/")) {
is_root:
fprintf(stderr, "Device %s is mounted as root file system!\n",
device);
exit(-1);
}
test_busy:
endmntent (f);
if ((stat(device, &st_buf) != 0) ||
!S_ISBLK(st_buf.st_mode))
return;
fd = open(device, O_RDONLY | O_EXCL);
if (fd < 0) {
if (errno == EBUSY) {
fprintf(stderr, "Device %s is used by the system\n", device);
exit(-1);
}
} else
close(fd);
return;
error:
endmntent (f);
fprintf(stderr, "Error while checking if device %s is mounted\n", device);
exit(-1);
#else
(void) device; /* shut up warnings about unused variable... */
#endif
}
time_t
file_time(int f)
{
struct stat statbuf;
if (!fstat(f, &statbuf))
return current_time;
if (statbuf.st_mtime<0 || statbuf.st_mtime>(uint32_t)(-1))
return current_time;
return(statbuf.st_mtime);
}
__dead void
pexit(char const * s, ...)
{
va_list va;
va_start(va, s);
vwarn(s, va);
va_end(va);
if (lct != 0)
warnx("Line %d being processed when error detected.\n", lct);
exit(2);
}
void *
alloc_block(void)
{
void *buf;
if(!(buf = malloc(block_size))) {
err(1, "couldn't allocate filesystem buffer");
}
memset(buf, 0, block_size);
return buf;
}
void
print_fs(void)
{
int i, j;
ino_t k;
struct inode *inode2;
unsigned short *usbuf;
block_t b;
struct direct *dir;
assert(inodes_per_block * sizeof(*inode2) == block_size);
if(!(inode2 = alloc_block()))
err(1, "couldn't allocate a block of inodes");
assert(NR_DIR_ENTRIES(block_size)*sizeof(*dir) == block_size);
if(!(dir = alloc_block()))
err(1, "couldn't allocate a block of directory entries");
usbuf = alloc_block();
get_super_block(usbuf);
printf("\nSuperblock: ");
for (i = 0; i < 8; i++) printf("%06ho ", usbuf[i]);
printf("\n ");
for (i = 0; i < 8; i++) printf("%#04hX ", usbuf[i]);
printf("\n ");
for (i = 8; i < 15; i++) printf("%06ho ", usbuf[i]);
printf("\n ");
for (i = 8; i < 15; i++) printf("%#04hX ", usbuf[i]);
get_block((block_t) INODE_MAP, usbuf);
printf("...\nInode map: ");
for (i = 0; i < 9; i++) printf("%06ho ", usbuf[i]);
get_block((block_t) zone_map, usbuf);
printf("...\nZone map: ");
for (i = 0; i < 9; i++) printf("%06ho ", usbuf[i]);
printf("...\n");
free(usbuf);
usbuf = NULL;
k = 0;
for (b = inode_offset; k < nrinodes; b++) {
get_block(b, inode2);
for (i = 0; i < inodes_per_block; i++) {
k = inodes_per_block * (int) (b - inode_offset) + i + 1;
/* Lint but OK */
if (k > nrinodes) break;
{
if (inode2[i].i_mode != 0) {
printf("Inode %3u: mode=", (unsigned)k);
printf("%06o", (unsigned)inode2[i].i_mode);
printf(" uid=%2d gid=%2d size=",
(int)inode2[i].i_uid, (int)inode2[i].i_gid);
printf("%6ld", (long)inode2[i].i_size);
printf(" zone[0]=%u\n", (unsigned)inode2[i].i_zone[0]);
}
if ((inode2[i].i_mode & S_IFMT) == S_IFDIR) {
/* This is a directory */
get_block(inode2[i].i_zone[0] << zone_shift, dir);
for (j = 0; j < NR_DIR_ENTRIES(block_size); j++)
if (dir[j].d_ino)
printf("\tInode %2u: %s\n",
(unsigned)dir[j].d_ino,
dir[j].d_name);
}
}
}
}
if (zone_shift)
printf("%d inodes used. %u zones (%u blocks) used.\n",
(int)next_inode-1, next_zone, next_zone*zone_per_block);
else
printf("%d inodes used. %u zones used.\n", (int)next_inode-1, next_zone);
free(dir);
free(inode2);
}
/*
* The first time a block is read, it returns all 0s, unless there has
* been a write. This routine checks to see if a block has been accessed.
*/
int
read_and_set(block_t n)
{
int w, s, mask, r;
w = n / 8;
assert(n < nrblocks);
if(w >= umap_array_elements) {
errx(1, "umap array too small - this can't happen");
}
s = n % 8;
mask = 1 << s;
r = (umap_array[w] & mask ? 1 : 0);
umap_array[w] |= mask;
return(r);
}
__dead void
usage(void)
{
fprintf(stderr, "Usage: %s [-dltv] [-b blocks] [-i inodes] [-z zone_shift]\n"
"\t[-x extra] [-B blocksize] special [proto]\n",
progname);
exit(4);
}
void
special(char * string)
{
fd = creat(string, 0777);
close(fd);
fd = open(string, O_RDWR);
if (fd < 0) err(1, "Can't open special file %s", string);
}
/* Read a block. */
void
get_block(block_t n, void *buf)
{
ssize_t k;
/* First access returns a zero block */
if (read_and_set(n) == 0) {
memcpy(buf, zero, block_size);
return;
}
if (lseek64(fd, mul64u(n, block_size), SEEK_SET, NULL) == (off_t)(-1))
pexit("get_block couldn't seek");
k = read(fd, buf, block_size);
if (k != block_size)
pexit("get_block couldn't read block #%u", (unsigned)n);
}
/* Read the super block. */
void
get_super_block(void *buf)
{
ssize_t k;
if(lseek(fd, (off_t) SUPER_BLOCK_BYTES, SEEK_SET) == (off_t) -1)
err(1, "seek for superblock failed");
k = read(fd, buf, SUPER_BLOCK_BYTES);
if (k != SUPER_BLOCK_BYTES)
err(1, "get_super_block couldn't read super block");
}
/* Write a block. */
void
put_block(block_t n, void *buf)
{
(void) read_and_set(n);
if (lseek64(fd, mul64u(n, block_size), SEEK_SET, NULL) == (off_t) -1)
pexit("put_block couldn't seek");
if (write(fd, buf, block_size)!= block_size)
pexit("put_block couldn't write block #%u", (unsigned)n);
}
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