/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2014 * The President and Fellows of Harvard College. * * 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. 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 UNIVERSITY 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 UNIVERSITY 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. */ #include <sys/types.h> #include <stdint.h> #include <string.h> #include <assert.h> #include <limits.h> #include <err.h> #include "support.h" #include "kern/sfs.h" #ifdef HOST #include <netinet/in.h> // for arpa/inet.h #include <arpa/inet.h> // for ntohl #include "hostcompat.h" #define SWAP64(x) ntohll(x) #define SWAP32(x) ntohl(x) #define SWAP16(x) ntohs(x) #else #define SWAP64(x) (x) #define SWAP32(x) (x) #define SWAP16(x) (x) #endif #include "disk.h" /* Maximum size of freemap we support */ #define MAXFREEMAPBLOCKS 32 /* Free block bitmap */ static char freemapbuf[MAXFREEMAPBLOCKS * SFS_BLOCKSIZE]; /* * Assert that the on-disk data structures are correctly sized. */ static void check(void) { assert(sizeof(struct sfs_superblock)==SFS_BLOCKSIZE); assert(sizeof(struct sfs_dinode)==SFS_BLOCKSIZE); assert(SFS_BLOCKSIZE % sizeof(struct sfs_direntry) == 0); } /* * Mark a block allocated. */ static void allocblock(uint32_t block) { uint32_t mapbyte = block/CHAR_BIT; unsigned char mask = (1<<(block % CHAR_BIT)); assert((freemapbuf[mapbyte] & mask) == 0); freemapbuf[mapbyte] |= mask; } /* * Initialize the free block bitmap. */ static void initfreemap(uint32_t fsblocks) { uint32_t freemapbits = SFS_FREEMAPBITS(fsblocks); uint32_t freemapblocks = SFS_FREEMAPBLOCKS(fsblocks); uint32_t i; if (freemapblocks > MAXFREEMAPBLOCKS) { errx(1, "Filesystem too large -- " "increase MAXFREEMAPBLOCKS and recompile"); } /* mark the superblock and root inode in use */ allocblock(SFS_SUPER_BLOCK); allocblock(SFS_ROOTDIR_INO); /* the freemap blocks must be in use */ for (i=0; i<freemapblocks; i++) { allocblock(SFS_FREEMAP_START + i); } /* all blocks in the freemap but past the volume end are "in use" */ for (i=fsblocks; i<freemapbits; i++) { allocblock(i); } } /* * Initialize and write out the superblock. */ static void writesuper(const char *volname, uint32_t nblocks) { struct sfs_superblock sb; /* The cast is required on some outdated host systems. */ bzero((void *)&sb, sizeof(sb)); if (strlen(volname) >= SFS_VOLNAME_SIZE) { errx(1, "Volume name %s too long", volname); } /* Initialize the superblock structure */ sb.sb_magic = SWAP32(SFS_MAGIC); sb.sb_nblocks = SWAP32(nblocks); strcpy(sb.sb_volname, volname); /* and write it out. */ diskwrite(&sb, SFS_SUPER_BLOCK); } /* * Write out the free block bitmap. */ static void writefreemap(uint32_t fsblocks) { uint32_t freemapblocks; char *ptr; uint32_t i; /* Write out each of the blocks in the free block bitmap. */ freemapblocks = SFS_FREEMAPBLOCKS(fsblocks); for (i=0; i<freemapblocks; i++) { ptr = freemapbuf + i*SFS_BLOCKSIZE; diskwrite(ptr, SFS_FREEMAP_START+i); } } /* * Write out the root directory inode. */ static void writerootdir(void) { struct sfs_dinode sfi; /* Initialize the dinode */ bzero((void *)&sfi, sizeof(sfi)); sfi.sfi_size = SWAP32(0); sfi.sfi_type = SWAP16(SFS_TYPE_DIR); sfi.sfi_linkcount = SWAP16(1); /* Write it out */ diskwrite(&sfi, SFS_ROOTDIR_INO); } /* * Main. */ int main(int argc, char **argv) { uint32_t size, blocksize; char *volname, *s; #ifdef HOST hostcompat_init(argc, argv); #endif if (argc!=3) { errx(1, "Usage: mksfs device/diskfile volume-name"); } check(); volname = argv[2]; /* Remove one trailing colon from volname, if present */ s = strchr(volname, ':'); if (s != NULL) { if (strlen(s)!=1) { errx(1, "Illegal volume name %s", volname); } *s = 0; } /* Don't allow slashes */ s = strchr(volname, '/'); if (s != NULL) { errx(1, "Illegal volume name %s", volname); } opendisk(argv[1]); blocksize = diskblocksize(); if (blocksize!=SFS_BLOCKSIZE) { errx(1, "Device has wrong blocksize %u (should be %u)\n", blocksize, SFS_BLOCKSIZE); } size = diskblocks(); /* Write out the on-disk structures */ initfreemap(size); writesuper(volname, size); writefreemap(size); writerootdir(); closedisk(); return 0; }