sanchayanmaity/minix
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
minix/usr.sbin/mkfs.mfs/mkfs.c
Thomas Veerman ac7451d11b mkfs.mfs: __dead and __UNCONST are unknown on Linux 
Including nbtool_config.h takes care of that deficiency when cross
compiling.
2012-11-26 16:18:32 +00:00

1460 lines
35 KiB
C
Raw Blame History

/* mkfs - make the MINIX filesystem Authors: Tanenbaum et al. */
/* Authors: Andy Tanenbaum, Paul Ogilvie, Frans Meulenbroeks, Bruce Evans
*
* This program can make version 1, 2 and 3 file systems, as follows:
* mkfs /dev/fd0 1200 # Version 3 (default)
* mkfs -1 /dev/fd0 360 # Version 1
*
* Note that the version 1 and 2 file systems produced by this program are not
* compatible with the original version 1 and 2 file system layout.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdint.h>
#include "const.h"
#include "type.h"
#include "mfsdir.h"
#if defined(__minix)
#include <minix/partition.h>
#include <minix/u64.h>
#include <minix/minlib.h>
#include <sys/ioctl.h>
#endif
#include <dirent.h>
#undef EXTERN
#define EXTERN /* get rid of EXTERN by making it null */
#include "super.h"
#ifndef max
#define max(a,b) ((a) > (b) ? (a) : (b))
#endif
#define INODE_MAP 2
#define MAX_TOKENS 10
#define LINE_LEN 200
#define BIN 2
#define BINGRP 2
#define BIT_MAP_SHIFT 13
#define INODE_MAX ((unsigned) 65535)
#define SECTOR_SIZE 512
#if !defined(__minix)
#define mul64u(a,b) ((a) * (b))
#define lseek64(a,b,c,d) lseek(a,b,c)
#ifdef __linux__
#include <mntent.h>
#endif
#endif
#if !defined(__minix)
typedef uint32_t block_t;
typedef uint32_t zone_t;
#endif
extern char *optarg;
extern int optind;
int next_zone, next_inode, zoff;
block_t nrblocks;
int inode_offset, lct = 0, disk, fd, print = 0, file = 0;
unsigned int nrinodes;
int override = 0, simple = 0, dflag;
int donttest; /* skip test if it fits on medium */
char *progname;
uint32_t current_time, bin_time;
char *zero, *lastp;
char *umap_array; /* bit map tells if block read yet */
int umap_array_elements = 0;
block_t zone_map; /* where is zone map? (depends on # inodes) */
int inodes_per_block;
size_t block_size;
int extra_space_percent;
FILE *proto;
#if defined(__NBSD_LIBC) || !defined(__minix)
#define getline _mkfs_getline
#endif
int main(int argc, char **argv);
block_t sizeup(char *device);
void super(zone_t zones, ino_t inodes);
void rootdir(ino_t inode);
int dir_try_enter(zone_t z, ino_t child, char *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 enter_symlink(ino_t inode, char *link);
d2_inode *get_inoblock(ino_t i, block_t *blockno, d2_inode **ino);
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 add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time);
void add_z_1(ino_t n, zone_t z, size_t bytes, uint32_t cur_time);
void add_z_2(ino_t n, zone_t z, size_t bytes, uint32_t cur_time);
void incr_link(ino_t n);
void insert_bit(block_t block, int bit);
int mode_con(char *p);
void getline(char line[LINE_LEN], char *parse[MAX_TOKENS]);
void check_mtab(char *devname);
uint32_t file_time(int f);
__dead void pexit(char const *s);
void copy(char *from, char *to, size_t count);
void print_fs(void);
int read_and_set(block_t n);
void special(char *string);
void get_block(block_t n, char *buf);
void get_super_block(char *buf);
void put_block(block_t n, char *buf);
void mx_read(int blocknr, char *buf);
void mx_write(int blocknr, char *buf);
void dexit(char *s, int sectnum, int err);
__dead void usage(void);
void *alloc_block(void);
ino_t inocount;
zone_t zonecount;
block_t blockcount;
void detect_fs_size(void);
void sizeup_dir(void);
void detect_size(void);
void size_dir(void);
static int bitmapsize(uint32_t nr_bits, size_t block_size);
/*================================================================
* mkfs - make filesystem
*===============================================================*/
int main(argc, argv)
int argc;
char *argv[];
{
int nread, mode, usrid, grpid, ch;
block_t blocks, maxblocks;
size_t i;
ino_t root_inum;
ino_t inodes;
zone_t zones;
char *token[MAX_TOKENS], line[LINE_LEN];
struct stat statbuf;
/* Get two times, the current time and the mod time of the binary of
* mkfs itself. When the -d flag is used, the later time is put into
* the i_mtimes of all the files. This 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 */
stat(argv[0], &statbuf);
bin_time = statbuf.st_mtime; /* time when mkfs binary was last modified */
/* Process switches. */
progname = argv[0];
blocks = 0;
i = 0;
inodes_per_block = 0;
block_size = 0;
extra_space_percent = 0;
while ((ch = getopt(argc, argv, "b:di:lotB:x:")) != EOF)
switch (ch) {
case 'b':
blocks = strtoul(optarg, (char **) NULL, 0);
break;
case 'd':
dflag = 1;
current_time = bin_time;
break;
case 'i':
i = strtoul(optarg, (char **) NULL, 0);
break;
case 'l': print = 1; break;
case 'o': override = 1; break;
case 't': donttest = 1; break;
case 'B': block_size = atoi(optarg); break;
case 'x': extra_space_percent = atoi(optarg); break;
default: usage();
}
if (argc == optind) usage();
/* 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();
{
if(!block_size) block_size = _MAX_BLOCK_SIZE; /* V3 default block size */
if(block_size%SECTOR_SIZE || block_size < _MIN_BLOCK_SIZE) {
fprintf(stderr, "block size must be multiple of sector (%d) "
"and at least %d bytes\n",
SECTOR_SIZE, _MIN_BLOCK_SIZE);
pexit("specified block size illegal");
}
if(block_size%V2_INODE_SIZE) {
fprintf(stderr, "block size must be a multiple of inode size (%d bytes)\n",
V2_INODE_SIZE);
pexit("specified block size illegal");
}
}
if(!inodes_per_block)
inodes_per_block = V2_INODES_PER_BLOCK(block_size);
/* now that the block size is known, do buffer allocations where
* possible.
*/
zero = alloc_block();
bzero(zero, block_size);
/* Determine the size of the device if not specified as -b or proto. */
maxblocks = sizeup(argv[optind]);
if (argc - optind == 1 && blocks == 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) {
fprintf(stderr, "%s: zero size device.\n", progname);
return 1;
}
}
/* 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 (blocks > maxblocks) {
fprintf(stderr, "%s: %s: number of blocks too large for device.\n",
progname, argv[optind]);
return 1;
}
/* 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;
getline(line, token); /* skip boot block info */
/* Read the line with the block and inode counts. */
getline(line, token);
blocks = atol(token[0]);
inodes = atoi(token[1]);
/* Process mode line for root directory. */
getline(line, token);
mode = mode_con(token[0]);
usrid = atoi(token[1]);
grpid = atoi(token[2]);
if(blocks <= 0 && inodes <= 0){
detect_fs_size();
blocks = blockcount;
inodes = inocount;
blocks += blocks*extra_space_percent/100;
inodes += inodes*extra_space_percent/100;
printf("dynamically sized filesystem: %d blocks, %d inodes\n", 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) pexit("Can't open prototype file");
}
if (i == 0) {
#if defined(__minix)
uint32_t kb = div64u(mul64u(blocks, block_size), 1024);
#else
uint32_t kb = ((unsigned long long) blocks * block_size) / 1024;
#endif
i = kb / 2;
if (kb >= 100000) i = kb / 4;
/* round up to fill inode block */
i += inodes_per_block - 1;
i = i / inodes_per_block * inodes_per_block;
}
if (blocks < 5) pexit("Block count too small");
if (i < 1) pexit("Inode count too small");
inodes = (ino_t) i;
/* Make simple file system of the given size, using defaults. */
mode = 040777;
usrid = BIN;
grpid = BINGRP;
simple = 1;
}
nrblocks = blocks;
nrinodes = inodes;
{
size_t bytes;
bytes = 1 + blocks/8;
if(!(umap_array = malloc(bytes))) {
fprintf(stderr, "mkfs: can't allocate block bitmap (%u bytes).\n",
bytes);
exit(1);
}
umap_array_elements = bytes;
}
/* Open special. */
special(argv[--optind]);
if (!donttest) {
short *testb;
ssize_t w;
testb = (short *) alloc_block();
/* Try writing the last block of partition or diskette. */
if(lseek64(fd, mul64u(blocks - 1, block_size), SEEK_SET, NULL) < 0) {
pexit("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, (char *) testb, block_size)) != block_size) {
if(w < 0) perror("write");
printf("%d/%u\n", w, block_size);
pexit("File system is too big for minor device (write)");
}
sync(); /* flush write, so if error next read fails */
if(lseek64(fd, mul64u(blocks - 1, block_size), SEEK_SET, NULL) < 0) {
pexit("couldn't seek to last block to test size (2)");
}
testb[0] = 0;
testb[1] = 0;
nread = read(fd, (char *) testb, block_size);
if (nread != block_size || testb[0] != 0x3245 || testb[1] != 0x11FF ||
testb[block_size/2-1] != 0x1F2F) {
if(nread < 0) perror("read");
printf("nread = %d\n", nread);
printf("testb = 0x%x 0x%x 0x%x\n", testb[0], testb[1], testb[block_size-1]);
pexit("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;
if (write(fd, (char *) testb, block_size) != block_size)
pexit("File system is too big for minor device (write2)");
lseek(fd, 0L, SEEK_SET);
free(testb);
}
/* Make the file-system */
put_block((block_t) 0, zero); /* Write a null boot block. */
zones = nrblocks;
super(zones, inodes);
root_inum = alloc_inode(mode, usrid, grpid);
rootdir(root_inum);
if (simple == 0) eat_dir(root_inum);
if (print) print_fs();
return(0);
/* NOTREACHED */
} /* end main */
/*================================================================
* detect_fs_size - determine image size dynamically
*===============================================================*/
void detect_fs_size()
{
uint32_t point = ftell(proto);
inocount = 1; /* root directory node */
zonecount = 0;
blockcount = 0;
sizeup_dir();
uint32_t initb;
initb = bitmapsize((uint32_t) (1 + inocount), block_size);
initb += bitmapsize((uint32_t) zonecount, block_size);
initb += START_BLOCK;
initb += (inocount + inodes_per_block - 1) / inodes_per_block;
blockcount = initb+zonecount;
fseek(proto, point, SEEK_SET);
}
void sizeup_dir()
{
char *token[MAX_TOKENS], *p;
char line[LINE_LEN];
FILE *f;
size_t size;
int dir_entries = 2;
zone_t dir_zones = 0;
zone_t nr_dzones;
nr_dzones = V2_NR_DZONES;
while (1) {
getline(line, token);
p = token[0];
if (*p == '$') {
dir_zones = (dir_entries / (NR_DIR_ENTRIES(block_size)));
if(dir_entries % (NR_DIR_ENTRIES(block_size)))
dir_zones++;
if(dir_zones > nr_dzones)
dir_zones++; /* Max single indir */
zonecount += dir_zones;
return;
}
p = token[1];
inocount++;
dir_entries++;
if (*p == 'd') {
sizeup_dir();
} else if (*p == 'b' || *p == 'c') {
} else if (*p == 's') {
zonecount++; /* Symlink contents is always stored a block */
} else {
if ((f = fopen(token[4], "r")) == NULL) {
fprintf(stderr, "%s: Can't open %s: %s\n",
progname, token[4], strerror(errno));
pexit("dynamic size detection failed");
} else {
if (fseek(f, 0, SEEK_END) < 0) {
fprintf(stderr, "%s: Can't seek to end of %s\n",
progname, token[4]);
pexit("dynamic size detection failed");
}
size = ftell(f);
fclose(f);
zone_t fzones= (size / block_size);
if (size % block_size)
fzones++;
if (fzones > nr_dzones)
fzones++; /* Assumes files fit within single indirect */
zonecount += fzones;
}
}
}
}
/*================================================================
* sizeup - determine device size
*===============================================================*/
block_t sizeup(device)
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) {
d = ULONG_MAX;
fprintf(stderr, "mkfs: truncating FS at %u blocks\n", d);
}
#else
size = lseek(fd, 0, SEEK_END);
if (size == (off_t) -1) {
fprintf(stderr, "Cannot get device size fd=%d\n", fd);
exit(-1);
}
d = size / block_size;
#endif
return d;
}
/*
* copied from fslib
*/
static int bitmapsize(uint32_t nr_bits, size_t blk_size)
{
block_t nr_blocks;
nr_blocks = (int) (nr_bits / FS_BITS_PER_BLOCK(blk_size));
if (((uint32_t) nr_blocks * FS_BITS_PER_BLOCK(blk_size)) < nr_bits)
++nr_blocks;
return(nr_blocks);
}
/*================================================================
* super - construct a superblock
*===============================================================*/
void super(zones, inodes)
zone_t zones;
ino_t inodes;
{
unsigned int i;
int inodeblks;
int initblks;
uint32_t nb;
zone_t v2sq;
zone_t zo;
struct super_block *sup;
char *buf, *cp;
buf = alloc_block();
for (cp = buf; cp < &buf[block_size]; cp++) *cp = 0;
sup = (struct super_block *) buf; /* lint - might use a union */
/* The assumption is that mkfs will create a clean FS. */
sup->s_flags = MFSFLAG_CLEAN;
sup->s_ninodes = inodes;
sup->s_nzones = 0; /* not used in V2 - 0 forces errors early */
sup->s_zones = zones;
#define BIGGERBLOCKS "Please try a larger block size for an FS of this size.\n"
sup->s_imap_blocks = nb = bitmapsize((uint32_t) (1 + inodes), block_size);
if(sup->s_imap_blocks != nb) {
fprintf(stderr, "mkfs: too many inode bitmap blocks.\n" BIGGERBLOCKS);
exit(1);
}
sup->s_zmap_blocks = nb = bitmapsize((uint32_t) zones, block_size);
if(nb != sup->s_zmap_blocks) {
fprintf(stderr, "mkfs: too many block bitmap blocks.\n" BIGGERBLOCKS);
exit(1);
}
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;
if(nb >= zones) pexit("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 = 0;
{
v2sq = (zone_t) V2_INDIRECTS(block_size) * V2_INDIRECTS(block_size);
zo = V2_NR_DZONES + (zone_t) V2_INDIRECTS(block_size) + v2sq;
{
sup->s_magic = SUPER_V3;
sup->s_block_size = block_size;
sup->s_disk_version = 0;
#define MAX_MAX_SIZE (INT_MAX)
if(MAX_MAX_SIZE/block_size < zo) {
sup->s_max_size = (int32_t) MAX_MAX_SIZE;
}
else {
sup->s_max_size = zo * block_size;
}
}
}
if (lseek(fd, (off_t) _STATIC_BLOCK_SIZE, SEEK_SET) == (off_t) -1) {
pexit("super() couldn't seek");
}
if (write(fd, buf, _STATIC_BLOCK_SIZE) != _STATIC_BLOCK_SIZE) {
pexit("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(inode)
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 *link)
{
zone_t z;
char *buf;
buf = alloc_block();
z = alloc_zone();
strcpy(buf, link);
put_block(z, buf);
add_zone(inode, z, (size_t) strlen(link), current_time);
free(buf);
}
/*================================================================
* eat_dir - recursively install directory
*===============================================================*/
void eat_dir(parent)
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) {
getline(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(inode, f)
ino_t inode;
int f;
{
int ct, k;
zone_t z;
char *buf;
uint32_t timeval;
buf = alloc_block();
do {
for (k = 0; k < block_size; k++) buf[k] = 0;
if ((ct = read(f, buf, block_size)) > 0) {
z = alloc_zone();
put_block(z, buf);
}
timeval = (dflag ? current_time : file_time(f));
if (ct) add_zone(inode, z, (size_t) ct, timeval);
} while (ct == block_size);
close(f);
free(buf);
}
d2_inode *get_inoblock(ino_t i, block_t *blockno, d2_inode **ino)
{
int off;
d2_inode *inoblock = alloc_block();
*blockno = ((i - 1) / inodes_per_block) + inode_offset;
off = (i - 1) % inodes_per_block;
get_block(*blockno, (char *) inoblock);
*ino = inoblock + off;
return inoblock;
}
int dir_try_enter(zone_t z, ino_t child, char *name)
{
char *p1, *p2;
struct direct *dir_entry = alloc_block();
int r = 0;
int i;
get_block(z, (char *) dir_entry);
for (i = 0; i < NR_DIR_ENTRIES(block_size); i++)
if (!dir_entry[i].mfs_d_ino)
break;
if(i < NR_DIR_ENTRIES(block_size)) {
int j;
r = 1;
dir_entry[i].mfs_d_ino = child;
p1 = name;
p2 = dir_entry[i].mfs_d_name;
j = sizeof(dir_entry[i].mfs_d_name);
assert(j == 60);
while (j--) {
*p2++ = *p1;
if (*p1 != 0) p1++;
}
}
put_block(z, (char *) dir_entry);
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;
zone_t z;
zone_t *indirblock = alloc_block();
d2_inode *ino;
d2_inode *inoblock = get_inoblock(parent, &b, &ino);
assert(!(block_size % sizeof(struct direct)));
for (k = 0; k < V2_NR_DZONES; k++) {
z = ino->d2_zone[k];
if (z == 0) {
z = alloc_zone();
ino->d2_zone[k] = z;
}
if(dir_try_enter(z, child, __UNCONST(name))) {
put_block(b, (char *) inoblock);
free(inoblock);
free(indirblock);
return;
}
}
/* no space in directory using just direct blocks; try indirect */
if (ino->d2_zone[V2_NR_DZONES] == 0)
ino->d2_zone[V2_NR_DZONES] = alloc_zone();
get_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock);
for(k = 0; k < V2_INDIRECTS(block_size); k++) {
z = indirblock[k];
if(!z) z = indirblock[k] = alloc_zone();
if(dir_try_enter(z, child, __UNCONST(name))) {
put_block(b, (char *) inoblock);
put_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock);
free(inoblock);
free(indirblock);
return;
}
}
printf("Directory-inode %lu beyond direct blocks. Could not enter %s\n",
parent, name);
pexit("Halt");
}
void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time)
{
/* Add zone z to inode n. The file has grown by 'bytes' bytes. */
int off, i;
block_t b;
zone_t indir;
zone_t *blk;
d2_inode *p;
d2_inode *inode;
if(!(blk = malloc(V2_INDIRECTS(block_size)*sizeof(*blk))))
pexit("Couldn't allocate indirect block");
if(!(inode = malloc(V2_INODES_PER_BLOCK(block_size)*sizeof(*inode))))
pexit("Couldn't allocate block of inodes");
b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset;
off = (n - 1) % V2_INODES_PER_BLOCK(block_size);
get_block(b, (char *) inode);
p = &inode[off];
p->d2_size += bytes;
p->d2_mtime = cur_time;
for (i = 0; i < V2_NR_DZONES; i++)
if (p->d2_zone[i] == 0) {
p->d2_zone[i] = z;
put_block(b, (char *) inode);
free(blk);
free(inode);
return;
}
put_block(b, (char *) inode);
/* File has grown beyond a small file. */
if (p->d2_zone[V2_NR_DZONES] == 0) p->d2_zone[V2_NR_DZONES] = alloc_zone();
indir = p->d2_zone[V2_NR_DZONES];
put_block(b, (char *) inode);
b = indir;
get_block(b, (char *) blk);
for (i = 0; i < V2_INDIRECTS(block_size); i++)
if (blk[i] == 0) {
blk[i] = z;
put_block(b, (char *) blk);
free(blk);
free(inode);
return;
}
pexit("File has grown beyond single indirect");
}
void incr_link(n)
ino_t n;
{
/* Increment the link count to inode n */
int off;
static int enter = 0;
block_t b;
if(enter) exit(1);
b = ((n - 1) / inodes_per_block) + inode_offset;
off = (n - 1) % inodes_per_block;
{
static d2_inode *inode2 = NULL;
int s;
s = sizeof(*inode2) * V2_INODES_PER_BLOCK(block_size);
if(!inode2 && !(inode2 = malloc(s)))
pexit("couldn't allocate a block of inodes");
get_block(b, (char *) inode2);
inode2[off].d2_nlinks++;
put_block(b, (char *) inode2);
}
enter = 0;
}
void incr_size(n, count)
ino_t n;
size_t count;
{
/* Increment the file-size in inode n */
block_t b;
int off;
b = ((n - 1) / inodes_per_block) + inode_offset;
off = (n - 1) % inodes_per_block;
{
d2_inode *inode2;
if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size) * sizeof(*inode2))))
pexit("couldn't allocate a block of inodes");
get_block(b, (char *) inode2);
inode2[off].d2_size += count;
put_block(b, (char *) inode2);
free(inode2);
}
}
/*================================================================
* allocation assist group
*===============================================================*/
static ino_t alloc_inode(mode, usrid, grpid)
int mode, usrid, grpid;
{
ino_t num;
int off;
block_t b;
num = next_inode++;
if (num > nrinodes) {
fprintf(stderr, "have %d inodoes\n", nrinodes);
pexit("File system does not have enough inodes");
}
b = ((num - 1) / inodes_per_block) + inode_offset;
off = (num - 1) % inodes_per_block;
{
d2_inode *inode2;
if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size) * sizeof(*inode2))))
pexit("couldn't allocate a block of inodes");
get_block(b, (char *) inode2);
inode2[off].d2_mode = mode;
inode2[off].d2_uid = usrid;
inode2[off].d2_gid = grpid;
put_block(b, (char *) inode2);
free(inode2);
}
/* Set the bit in the bit map. */
/* DEBUG FIXME. This assumes the bit is in the first inode map block. */
insert_bit((block_t) INODE_MAP, (int) num);
return(num);
}
static zone_t alloc_zone()
{
/* Allocate a new zone */
/* Works for zone > block */
block_t b;
zone_t z;
z = next_zone++;
b = z;
if ((b + 1) > nrblocks)
pexit("File system not big enough for all the files");
put_block(b, zero); /* give an empty zone */
/* DEBUG FIXME. This assumes the bit is in the first zone map block. */
insert_bit(zone_map, (int) (z - zoff)); /* lint, NOT OK because
* z hasn't been broken
* up into block +
* offset yet. */
return(z);
}
void insert_bit(block, bit)
block_t block;
int bit;
{
/* Insert 'count' bits in the bitmap */
int w, s;
#if defined(__minix)
bitchunk_t *buf;
#else
uint32_t *buf;
#endif
#if defined(__minix)
buf = (bitchunk_t *) alloc_block();
#else
buf = (uint32_t *) alloc_block();
#endif
get_block(block, (char *) buf);
#if defined(__minix)
w = bit / (8 * sizeof(bitchunk_t));
s = bit % (8 * sizeof(bitchunk_t));
#else
w = bit / (8 * sizeof(uint32_t));
s = bit % (8 * sizeof(uint32_t));
#endif
buf[w] |= (1 << s);
put_block(block, (char *) buf);
free(buf);
}
/*================================================================
* proto-file processing assist group
*===============================================================*/
int mode_con(p)
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 == '-') mode |= S_IFREG;
if (c2 == 'u') mode |= S_ISUID;
if (c3 == 'g') mode |= S_ISGID;
return(mode);
}
void getline(line, parse)
char *parse[MAX_TOKENS];
char line[LINE_LEN];
{
/* 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;
for (k = 0; k < LINE_LEN; k++) line[k] = 0;
k = 0;
parse[0] = 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 == '\n') lct++;
if (*p == ' ' || *p == '\t') *p = 0;
if (*p == '\n') {
*p++ = 0;
*p = '\n';
break;
}
p++;
}
k = 0;
p = line;
lastp = 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
*===============================================================*/
void check_mtab(device)
char *device; /* /dev/hd1 or whatever */
{
/* Check to see if the special file named in s is mounted. */
#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. */
fprintf(stderr, "%s: stat %s failed: %s\n",
progname, device, strerror(errno));
exit(1);
}
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. */
fprintf(stderr, "%s: %s is mounted on %s\n",
progname, device, mount_point);
exit(1);
}
}
#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);
#endif
}
uint32_t file_time(f)
int f;
{
struct stat statbuf;
fstat(f, &statbuf);
return(statbuf.st_mtime);
}
__dead void pexit(char const * s)
{
fprintf(stderr, "%s: %s\n", progname, s);
if (lct != 0)
fprintf(stderr, "Line %d being processed when error detected.\n", lct);
exit(2);
}
void copy(from, to, count)
char *from, *to;
size_t count;
{
while (count--) *to++ = *from++;
}
void *alloc_block()
{
char *buf;
if(!(buf = malloc(block_size))) {
pexit("couldn't allocate filesystem buffer");
}
bzero(buf, block_size);
return buf;
}
void print_fs()
{
int i, j;
ino_t k;
d2_inode *inode2;
unsigned short *usbuf;
block_t b;
struct direct *dir;
if(!(inode2 = malloc(V2_INODES_PER_BLOCK(block_size) * sizeof(*inode2))))
pexit("couldn't allocate a block of inodes");
if(!(dir = malloc(NR_DIR_ENTRIES(block_size)*sizeof(*dir))))
pexit("malloc of directory entry failed");
usbuf = (unsigned short *) alloc_block();
get_super_block((char *) usbuf);
printf("\nSuperblock: ");
for (i = 0; i < 8; i++) printf("%06o ", usbuf[i]);
get_block((block_t) 2, (char *) usbuf);
printf("...\nInode map: ");
for (i = 0; i < 9; i++) printf("%06o ", usbuf[i]);
get_block((block_t) 3, (char *) usbuf);
printf("...\nZone map: ");
for (i = 0; i < 9; i++) printf("%06o ", usbuf[i]);
printf("...\n");
free(usbuf);
usbuf = NULL;
k = 0;
for (b = inode_offset; k < nrinodes; b++) {
get_block(b, (char *) 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].d2_mode != 0) {
printf("Inode %2lu: mode=", k);
printf("%06o", inode2[i].d2_mode);
printf(" uid=%2d gid=%2d size=",
inode2[i].d2_uid, inode2[i].d2_gid);
printf("%6d", inode2[i].d2_size);
printf(" zone[0]=%u\n", inode2[i].d2_zone[0]);
}
if ((inode2[i].d2_mode & S_IFMT) == S_IFDIR) {
/* This is a directory */
get_block(inode2[i].d2_zone[0], (char *) dir);
for (j = 0; j < NR_DIR_ENTRIES(block_size); j++)
if (dir[j].mfs_d_ino)
printf("\tInode %2u: %s\n", dir[j].mfs_d_ino, dir[j].mfs_d_name);
}
}
}
}
printf("%d inodes used. %d zones used.\n", next_inode - 1, next_zone);
free(dir);
free(inode2);
}
int read_and_set(n)
block_t n;
{
/* 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 w, s, mask, r;
w = n / 8;
if(w >= umap_array_elements) {
pexit("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()
{
fprintf(stderr,
"Usage: %s [-12dlot] [-b blocks] [-i inodes]\n"
"\t[-x extra] [-B blocksize] special [proto]\n",
progname);
exit(1);
}
void special(string)
char *string;
{
fd = creat(string, 0777);
close(fd);
fd = open(string, O_RDWR);
if (fd < 0) pexit("Can't open special file");
}
void get_block(n, buf)
block_t n;
char *buf;
{
/* Read a block. */
int k;
/* First access returns a zero block */
if (read_and_set(n) == 0) {
copy(zero, buf, block_size);
return;
}
lseek64(fd, mul64u(n, block_size), SEEK_SET, NULL);
k = read(fd, buf, block_size);
if (k != block_size) {
pexit("get_block couldn't read");
}
}
void get_super_block(buf)
char *buf;
{
/* Read a block. */
int k;
if(lseek(fd, (off_t) SUPER_BLOCK_BYTES, SEEK_SET) < 0) {
perror("lseek");
pexit("seek failed");
}
k = read(fd, buf, _STATIC_BLOCK_SIZE);
if (k != _STATIC_BLOCK_SIZE) {
pexit("get_super_block couldn't read");
}
}
void put_block(n, buf)
block_t n;
char *buf;
{
/* Write a block. */
(void) read_and_set(n);
/* XXX - check other lseeks too. */
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");
}
}
Reference in a new issue View git blame Copy permalink