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NetBSD/sbin/newlfs/lfs.c

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/* $NetBSD: lfs.c,v 1.14 1998/04/01 16:24:34 kleink Exp $ */
/*-
* Copyright (c) 1991, 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)lfs.c 8.5 (Berkeley) 5/24/95";
#else
__RCSID("$NetBSD: lfs.c,v 1.14 1998/04/01 16:24:34 kleink Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/dinode.h>
#include <ufs/lfs/lfs.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "config.h"
#include "extern.h"
/*
* This table is indexed by the log base 2 of the block size.
* It returns the maximum file size allowed in a file system
* with the specified block size. For block sizes smaller than
* 8K, the size is limited by tha maximum number of blocks that
* can be reached by triply indirect blocks:
* NDADDR + INOPB(bsize) + INOPB(bsize)^2 + INOPB(bsize)^3
* For block size of 8K or larger, the file size is limited by the
* number of blocks that can be represented in the file system. Since
* we use negative block numbers to represent indirect blocks, we can
* have a maximum of 2^31 blocks.
*/
u_quad_t maxtable[] = {
/* 1 */ -1,
/* 2 */ -1,
/* 4 */ -1,
/* 8 */ -1,
/* 16 */ -1,
/* 32 */ -1,
/* 64 */ -1,
/* 128 */ -1,
/* 256 */ -1,
/* 512 */ NDADDR + 128 + 128 * 128 + 128 * 128 * 128,
/* 1024 */ NDADDR + 256 + 256 * 256 + 256 * 256 * 256,
/* 2048 */ NDADDR + 512 + 512 * 512 + 512 * 512 * 512,
/* 4096 */ NDADDR + 1024 + 1024 * 1024 + 1024 * 1024 * 1024,
/* 8192 */ 1 << 31,
/* 16 K */ 1 << 31,
/* 32 K */ 1 << 31,
};
static struct lfs lfs_default = {
/* lfs_magic */ LFS_MAGIC,
/* lfs_version */ LFS_VERSION,
/* lfs_size */ 0,
/* lfs_ssize */ DFL_LFSSEG/DFL_LFSBLOCK,
/* lfs_dsize */ 0,
/* lfs_bsize */ DFL_LFSBLOCK,
/* lfs_fsize */ DFL_LFSFRAG,
/* lfs_frag */ 1,
/* lfs_free */ LFS_FIRST_INUM,
/* lfs_bfree */ 0,
/* lfs_nfiles */ 0,
/* lfs_avail */ 0,
/* lfs_uinodes */ 0,
/* lfs_idaddr */ 0,
/* lfs_ifile */ LFS_IFILE_INUM,
/* lfs_lastseg */ 0,
/* lfs_nextseg */ 0,
/* lfs_curseg */ 0,
/* lfs_offset */ 0,
/* lfs_lastpseg */ 0,
/* lfs_tstamp */ 0,
/* lfs_minfree */ MINFREE,
/* lfs_maxfilesize */ 0,
/* lfs_dbpseg */ DFL_LFSSEG/DEV_BSIZE,
/* lfs_inopb */ DFL_LFSBLOCK/sizeof(struct dinode),
/* lfs_ifpb */ DFL_LFSBLOCK/sizeof(IFILE),
/* lfs_sepb */ DFL_LFSBLOCK/sizeof(SEGUSE),
/* lfs_nindir */ DFL_LFSBLOCK/sizeof(daddr_t),
/* lfs_nseg */ 0,
/* lfs_nspf */ 0,
/* lfs_cleansz */ 0,
/* lfs_segtabsz */ 0,
/* lfs_segmask */ DFL_LFSSEG_MASK,
/* lfs_segshift */ DFL_LFSSEG_SHIFT,
/* lfs_bmask */ DFL_LFSBLOCK_MASK,
/* lfs_bshift */ DFL_LFSBLOCK_SHIFT,
/* lfs_ffmask */ DFL_LFS_FFMASK,
/* lfs_ffshift */ DFL_LFS_FFSHIFT,
/* lfs_fbmask */ DFL_LFS_FBMASK,
/* lfs_fbshift */ DFL_LFS_FBSHIFT,
/* lfs_fsbtodb */ 0,
/* lfs_sushift */ 0,
/* lfs_maxsymlinklen */ MAXSYMLINKLEN,
/* lfs_sboffs */ { 0 },
/* lfs_cksum */ 0,
/* lfs_sp */ NULL,
/* lfs_ivnode */ NULL,
/* lfs_seglock */ 0,
/* lfs_lockpid */ 0,
/* lfs_iocount */ 0,
/* lfs_writer */ 0,
/* lfs_dirops */ 0,
/* lfs_doifile */ 0,
/* lfs_nactive */ 0,
/* lfs_fmod */ 0,
/* lfs_clean */ 0,
/* lfs_ronly */ 0,
/* lfs_flags */ 0,
/* lfs_fsmnt */ { 0 },
/* lfs_pad */ { 0 },
};
struct direct lfs_root_dir[] = {
{ ROOTINO, sizeof(struct direct), DT_DIR, 1, "."},
{ ROOTINO, sizeof(struct direct), DT_DIR, 2, ".."},
{ LFS_IFILE_INUM, sizeof(struct direct), DT_REG, 5, "ifile"},
{ LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 10, "lost+found"},
};
struct direct lfs_lf_dir[] = {
{ LOSTFOUNDINO, sizeof(struct direct), DT_DIR, 1, "." },
{ ROOTINO, sizeof(struct direct), DT_DIR, 2, ".." },
};
static daddr_t make_dinode
__P((ino_t, struct dinode *, int, daddr_t, struct lfs *));
static void make_dir __P(( void *, struct direct *, int));
static void put __P((int, off_t, void *, size_t));
int
make_lfs(fd, lp, partp, minfree, block_size, frag_size, seg_size)
int fd;
struct disklabel *lp;
struct partition *partp;
int minfree;
int block_size;
int frag_size;
int seg_size;
{
struct dinode *dip; /* Pointer to a disk inode */
struct dinode *dpagep; /* Pointer to page of disk inodes */
CLEANERINFO *cleaninfo; /* Segment cleaner information table */
FINFO file_info; /* File info structure in summary blocks */
IFILE *ifile; /* Pointer to array of ifile structures */
IFILE *ip; /* Pointer to array of ifile structures */
struct lfs *lfsp; /* Superblock */
SEGUSE *segp; /* Segment usage table */
SEGUSE *segtable; /* Segment usage table */
SEGSUM summary; /* Segment summary structure */
SEGSUM *sp; /* Segment summary pointer */
daddr_t last_sb_addr; /* Address of superblocks */
daddr_t last_addr; /* Previous segment address */
daddr_t sb_addr; /* Address of superblocks */
daddr_t seg_addr; /* Address of current segment */
char *ipagep; /* Pointer to the page we use to write stuff */
char *sump; /* Used to copy stuff into segment buffer */
u_long *block_array; /* Array of logical block nos to put in sum */
u_long blocks_used; /* Number of blocks in first segment */
u_long *dp; /* Used to computed checksum on data */
u_long *datasump; /* Used to computed checksum on data */
int block_array_size; /* How many entries in block array */
int bsize; /* Block size */
int fsize; /* Fragment size */
int db_per_fb; /* Disk blocks per file block */
int i, j;
int off; /* Offset at which to write */
int sb_interval; /* number of segs between super blocks */
int seg_seek; /* Seek offset for a segment */
int ssize; /* Segment size */
int sum_size; /* Size of the summary block */
lfsp = &lfs_default;
if (!(bsize = block_size))
bsize = DFL_LFSBLOCK;
if (!(fsize = frag_size))
fsize = DFL_LFSFRAG;
if (!(ssize = seg_size))
ssize = DFL_LFSSEG;
/* Modify parts of superblock overridden by command line arguments */
if (bsize != DFL_LFSBLOCK || fsize != DFL_LFSFRAG) {
lfsp->lfs_bshift = log2(bsize);
if (1 << lfsp->lfs_bshift != bsize)
fatal("%d: block size not a power of 2", bsize);
lfsp->lfs_bsize = bsize;
lfsp->lfs_fsize = fsize;
lfsp->lfs_bmask = bsize - 1;
lfsp->lfs_inopb = bsize / sizeof(struct dinode);
lfsp->lfs_ffmask = fsize - 1;
lfsp->lfs_ffshift = log2(fsize);
if (1 << lfsp->lfs_ffshift != fsize)
fatal("%d: frag size not a power of 2", fsize);
lfsp->lfs_frag = numfrags(lfsp, bsize);
lfsp->lfs_fbmask = lfsp->lfs_frag - 1;
lfsp->lfs_fbshift = log2(lfsp->lfs_frag);
/* MIS -- should I round to power of 2 */
lfsp->lfs_ifpb = bsize / sizeof(IFILE);
lfsp->lfs_sepb = bsize / sizeof(SEGUSE);
lfsp->lfs_nindir = bsize / sizeof(daddr_t);
}
if (ssize != DFL_LFSSEG) {
lfsp->lfs_segshift = log2(ssize);
if (1 << lfsp->lfs_segshift != ssize)
fatal("%d: segment size not power of 2", ssize);
lfsp->lfs_ssize = ssize;
lfsp->lfs_segmask = ssize - 1;
lfsp->lfs_dbpseg = ssize / DEV_BSIZE;
}
lfsp->lfs_ssize = ssize >> lfsp->lfs_bshift;
if (minfree)
lfsp->lfs_minfree = minfree;
/*
* Fill in parts of superblock that can be computed from file system
* size, disk geometry and current time.
*/
db_per_fb = bsize/lp->d_secsize;
lfsp->lfs_fsbtodb = log2(db_per_fb);
lfsp->lfs_sushift = log2(lfsp->lfs_sepb);
lfsp->lfs_size = partp->p_size >> lfsp->lfs_fsbtodb;
lfsp->lfs_dsize = lfsp->lfs_size - (LFS_LABELPAD >> lfsp->lfs_bshift);
lfsp->lfs_nseg = lfsp->lfs_dsize / lfsp->lfs_ssize;
lfsp->lfs_maxfilesize = maxtable[lfsp->lfs_bshift] << lfsp->lfs_bshift;
/*
* The number of free blocks is set from the number of segments times
* the segment size - 2 (that we never write because we need to make
* sure the cleaner can run). Then we'll subtract off the room for the
* superblocks ifile entries and segment usage table.
*/
lfsp->lfs_dsize = fsbtodb(lfsp, (lfsp->lfs_nseg - 2) * lfsp->lfs_ssize);
lfsp->lfs_bfree = lfsp->lfs_dsize;
lfsp->lfs_segtabsz = SEGTABSIZE_SU(lfsp);
lfsp->lfs_cleansz = CLEANSIZE_SU(lfsp);
if ((lfsp->lfs_tstamp = time(NULL)) == -1)
fatal("time: %s", strerror(errno));
if ((sb_interval = lfsp->lfs_nseg / LFS_MAXNUMSB) < LFS_MIN_SBINTERVAL)
sb_interval = LFS_MIN_SBINTERVAL;
/*
* Now, lay out the file system. We need to figure out where
* the superblocks go, initialize the checkpoint information
* for the first two superblocks, initialize the segment usage
* information, put the segusage information in the ifile, create
* the first block of IFILE structures, and link all the IFILE
* structures into a free list.
*/
/* Figure out where the superblocks are going to live */
lfsp->lfs_sboffs[0] = LFS_LABELPAD/lp->d_secsize;
for (i = 1; i < LFS_MAXNUMSB; i++) {
sb_addr = ((i * sb_interval) <<
(lfsp->lfs_segshift - lfsp->lfs_bshift + lfsp->lfs_fsbtodb))
+ lfsp->lfs_sboffs[0];
if (sb_addr > partp->p_size)
break;
lfsp->lfs_sboffs[i] = sb_addr;
}
last_sb_addr = lfsp->lfs_sboffs[i - 1];
lfsp->lfs_lastseg = lfsp->lfs_sboffs[0];
lfsp->lfs_nextseg =
lfsp->lfs_sboffs[1] ? lfsp->lfs_sboffs[1] : lfsp->lfs_sboffs[0];
lfsp->lfs_curseg = lfsp->lfs_lastseg;
/*
* Initialize the segment usage table. The first segment will
* contain the superblock, the cleanerinfo (cleansz), the segusage
* table * (segtabsz), 1 block's worth of IFILE entries, the root
* directory, the lost+found directory and one block's worth of
* inodes (containing the ifile, root, and l+f inodes).
*/
if (!(cleaninfo = malloc(lfsp->lfs_cleansz << lfsp->lfs_bshift)))
fatal("%s", strerror(errno));
cleaninfo->clean = lfsp->lfs_nseg - 1;
cleaninfo->dirty = 1;
if (!(segtable = malloc(lfsp->lfs_segtabsz << lfsp->lfs_bshift)))
fatal("%s", strerror(errno));
segp = segtable;
blocks_used = lfsp->lfs_segtabsz + lfsp->lfs_cleansz + 4;
segp->su_nbytes = ((blocks_used - 1) << lfsp->lfs_bshift) +
3 * sizeof(struct dinode) + LFS_SUMMARY_SIZE;
segp->su_lastmod = lfsp->lfs_tstamp;
segp->su_nsums = 1; /* 1 summary blocks */
segp->su_ninos = 1; /* 1 inode block */
segp->su_flags = SEGUSE_SUPERBLOCK | SEGUSE_DIRTY;
lfsp->lfs_bfree -= LFS_SUMMARY_SIZE / lp->d_secsize;
lfsp->lfs_bfree -=
fsbtodb(lfsp, lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 4);
/*
* Now figure out the address of the ifile inode. The inode block
* appears immediately after the segment summary.
*/
lfsp->lfs_idaddr = (LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE) /
lp->d_secsize;
for (segp = segtable + 1, i = 1; i < lfsp->lfs_nseg; i++, segp++) {
if ((i % sb_interval) == 0) {
segp->su_flags = SEGUSE_SUPERBLOCK;
lfsp->lfs_bfree -= (LFS_SBPAD / lp->d_secsize);
} else
segp->su_flags = 0;
segp->su_lastmod = 0;
segp->su_nbytes = 0;
segp->su_ninos = 0;
segp->su_nsums = 0;
}
/*
* Initialize dynamic accounting. The blocks available for
* writing are the bfree blocks minus 1 segment summary for
* each segment since you can't write any new data without
* creating a segment summary - 2 segments that the cleaner
* needs.
*/
lfsp->lfs_avail = lfsp->lfs_bfree - lfsp->lfs_nseg -
fsbtodb(lfsp, 2 * lfsp->lfs_ssize);
lfsp->lfs_uinodes = 0;
/*
* Ready to start writing segments. The first segment is different
* because it contains the segment usage table and the ifile inode
* as well as a superblock. For the rest of the segments, set the
* time stamp to be 0 so that the first segment is the most recent.
* For each segment that is supposed to contain a copy of the super
* block, initialize its first few blocks and its segment summary
* to indicate this.
*/
lfsp->lfs_nfiles = LFS_FIRST_INUM - 1;
lfsp->lfs_cksum =
cksum(lfsp, sizeof(struct lfs) - sizeof(lfsp->lfs_cksum));
/* Now create a block of disk inodes */
if (!(dpagep = malloc(lfsp->lfs_bsize)))
fatal("%s", strerror(errno));
dip = (struct dinode *)dpagep;
memset(dip, 0, lfsp->lfs_bsize);
/* Create a block of IFILE structures. */
if (!(ipagep = (char *)malloc(lfsp->lfs_bsize)))
fatal("%s", strerror(errno));
ifile = (IFILE *)ipagep;
/*
* Initialize IFILE. It is the next block following the
* block of inodes (whose address has been calculated in
* lfsp->lfs_idaddr;
*/
sb_addr = lfsp->lfs_idaddr + lfsp->lfs_bsize / lp->d_secsize;
sb_addr = make_dinode(LFS_IFILE_INUM, dip,
lfsp->lfs_cleansz + lfsp->lfs_segtabsz+1, sb_addr, lfsp);
dip->di_mode = IFREG|IREAD|IWRITE;
ip = &ifile[LFS_IFILE_INUM];
ip->if_version = 1;
ip->if_daddr = lfsp->lfs_idaddr;
/* Initialize the ROOT Directory */
sb_addr = make_dinode(ROOTINO, ++dip, 1, sb_addr, lfsp);
dip->di_mode = IFDIR|IREAD|IWRITE|IEXEC;
dip->di_size = DIRBLKSIZ;
dip->di_nlink = 3;
ip = &ifile[ROOTINO];
ip->if_version = 1;
ip->if_daddr = lfsp->lfs_idaddr;
/* Initialize the lost+found Directory */
sb_addr = make_dinode(LOSTFOUNDINO, ++dip, 1, sb_addr, lfsp);
dip->di_mode = IFDIR|IREAD|IWRITE|IEXEC;
dip->di_size = DIRBLKSIZ;
dip->di_nlink = 2;
ip = &ifile[LOSTFOUNDINO];
ip->if_version = 1;
ip->if_daddr = lfsp->lfs_idaddr;
/* Make all the other dinodes invalid */
for (i = INOPB(lfsp)-3, dip++; i; i--, dip++)
dip->di_inumber = LFS_UNUSED_INUM;
/* Link remaining IFILE entries in free list */
for (ip = &ifile[LFS_FIRST_INUM], i = LFS_FIRST_INUM;
i < lfsp->lfs_ifpb; ++ip) {
ip->if_version = 1;
ip->if_daddr = LFS_UNUSED_DADDR;
ip->if_nextfree = ++i;
}
ifile[lfsp->lfs_ifpb - 1].if_nextfree = LFS_UNUSED_INUM;
/* Now, write the segment */
/* Compute a checksum across all the data you're writing */
dp = datasump = malloc (blocks_used * sizeof(u_long));
*dp++ = ((u_long *)dpagep)[0]; /* inode block */
for (i = 0; i < lfsp->lfs_cleansz; i++)
*dp++ = ((u_long *)cleaninfo)[(i << lfsp->lfs_bshift) /
sizeof(u_long)]; /* Cleaner info */
for (i = 0; i < lfsp->lfs_segtabsz; i++)
*dp++ = ((u_long *)segtable)[(i << lfsp->lfs_bshift) /
sizeof(u_long)]; /* Segusage table */
*dp++ = ((u_long *)ifile)[0]; /* Ifile */
/* Still need the root and l+f bytes; get them later */
/* Write out the inode block */
off = LFS_LABELPAD + LFS_SBPAD + LFS_SUMMARY_SIZE;
put(fd, off, dpagep, lfsp->lfs_bsize);
free(dpagep);
off += lfsp->lfs_bsize;
/* Write out the ifile */
put(fd, off, cleaninfo, lfsp->lfs_cleansz << lfsp->lfs_bshift);
off += (lfsp->lfs_cleansz << lfsp->lfs_bshift);
(void)free(cleaninfo);
put(fd, off, segtable, lfsp->lfs_segtabsz << lfsp->lfs_bshift);
off += (lfsp->lfs_segtabsz << lfsp->lfs_bshift);
(void)free(segtable);
put(fd, off, ifile, lfsp->lfs_bsize);
off += lfsp->lfs_bsize;
/*
* use ipagep for space for writing out other stuff. It used to
* contain the ifile, but we're done with it.
*/
/* Write out the root and lost and found directories */
memset(ipagep, 0, lfsp->lfs_bsize);
make_dir(ipagep, lfs_root_dir,
sizeof(lfs_root_dir) / sizeof(struct direct));
*dp++ = ((u_long *)ipagep)[0];
put(fd, off, ipagep, lfsp->lfs_bsize);
off += lfsp->lfs_bsize;
memset(ipagep, 0, lfsp->lfs_bsize);
make_dir(ipagep, lfs_lf_dir,
sizeof(lfs_lf_dir) / sizeof(struct direct));
*dp++ = ((u_long *)ipagep)[0];
put(fd, off, ipagep, lfsp->lfs_bsize);
/* Write Supberblock */
lfsp->lfs_offset = (off + lfsp->lfs_bsize) / lp->d_secsize;
put(fd, LFS_LABELPAD, lfsp, sizeof(struct lfs));
/*
* Finally, calculate all the fields for the summary structure
* and write it.
*/
summary.ss_next = lfsp->lfs_nextseg;
summary.ss_create = lfsp->lfs_tstamp;
summary.ss_nfinfo = 3;
summary.ss_ninos = 3;
summary.ss_magic = SS_MAGIC;
summary.ss_datasum = cksum(datasump, sizeof(u_long) * blocks_used);
/*
* Make sure that we don't overflow a summary block. We have to
* record: FINFO structures for ifile, root, and l+f. The number
* of blocks recorded for the ifile is determined by the size of
* the cleaner info and the segments usage table. There is room
* for one block included in sizeof(FINFO) so we don't need to add
* any extra space for the ROOT and L+F, and one block of the ifile
* is already counted. Finally, we leave room for 1 inode block
* address.
*/
sum_size = 3*sizeof(FINFO) + sizeof(SEGSUM) + sizeof(daddr_t) +
(lfsp->lfs_cleansz + lfsp->lfs_segtabsz) * sizeof(u_long);
#define SUMERR \
"Multiple summary blocks in segment 1 not yet implemented\nsummary is %d bytes."
if (sum_size > LFS_SUMMARY_SIZE)
fatal(SUMERR, sum_size);
block_array_size = lfsp->lfs_cleansz + lfsp->lfs_segtabsz + 1;
if (!(block_array = malloc(block_array_size *sizeof(int))))
fatal("%s: %s", special, strerror(errno));
/* fill in the array */
for (i = 0; i < block_array_size; i++)
block_array[i] = i;
/* copy into segment */
sump = ipagep;
memcpy(sump, &summary, sizeof(SEGSUM));
sump += sizeof(SEGSUM);
/* Now, add the ifile */
file_info.fi_nblocks = block_array_size;
file_info.fi_version = 1;
file_info.fi_lastlength = lfsp->lfs_bsize;
file_info.fi_ino = LFS_IFILE_INUM;
memmove(sump, &file_info, sizeof(FINFO) - sizeof(u_long));
sump += sizeof(FINFO) - sizeof(u_long);
memmove(sump, block_array, sizeof(u_long) * file_info.fi_nblocks);
sump += sizeof(u_long) * file_info.fi_nblocks;
/* Now, add the root directory */
file_info.fi_nblocks = 1;
file_info.fi_version = 1;
file_info.fi_ino = ROOTINO;
file_info.fi_blocks[0] = 0;
memmove(sump, &file_info, sizeof(FINFO));
sump += sizeof(FINFO);
/* Now, add the lost and found */
file_info.fi_ino = LOSTFOUNDINO;
memmove(sump, &file_info, sizeof(FINFO));
((daddr_t *)ipagep)[LFS_SUMMARY_SIZE / sizeof(daddr_t) - 1] =
lfsp->lfs_idaddr;
((SEGSUM *)ipagep)->ss_sumsum = cksum(ipagep+sizeof(summary.ss_sumsum),
LFS_SUMMARY_SIZE - sizeof(summary.ss_sumsum));
put(fd, LFS_LABELPAD + LFS_SBPAD, ipagep, LFS_SUMMARY_SIZE);
sp = (SEGSUM *)ipagep;
sp->ss_create = 0;
sp->ss_nfinfo = 0;
sp->ss_ninos = 0;
sp->ss_datasum = 0;
sp->ss_magic = SS_MAGIC;
/* Now write the summary block for the next partial so it's invalid */
lfsp->lfs_tstamp = 0;
off += lfsp->lfs_bsize;
sp->ss_sumsum =
cksum(&sp->ss_datasum, LFS_SUMMARY_SIZE - sizeof(sp->ss_sumsum));
put(fd, off, sp, LFS_SUMMARY_SIZE);
/* Now, write rest of segments containing superblocks */
lfsp->lfs_cksum =
cksum(lfsp, sizeof(struct lfs) - sizeof(lfsp->lfs_cksum));
for (seg_addr = last_addr = lfsp->lfs_sboffs[0], j = 1, i = 1;
i < lfsp->lfs_nseg; i++) {
seg_addr += lfsp->lfs_ssize << lfsp->lfs_fsbtodb;
sp->ss_next = last_addr;
last_addr = seg_addr;
seg_seek = seg_addr * lp->d_secsize;
if (seg_addr == lfsp->lfs_sboffs[j]) {
if (j < (LFS_MAXNUMSB - 2))
j++;
put(fd, seg_seek, lfsp, sizeof(struct lfs));
seg_seek += LFS_SBPAD;
}
/* Summary */
sp->ss_sumsum = cksum(&sp->ss_datasum,
LFS_SUMMARY_SIZE - sizeof(sp->ss_sumsum));
put(fd, seg_seek, sp, LFS_SUMMARY_SIZE);
}
free(ipagep);
close(fd);
return (0);
}
static void
put(fd, off, p, len)
int fd;
off_t off;
void *p;
size_t len;
{
int wbytes;
if (lseek(fd, off, SEEK_SET) < 0)
fatal("%s: %s", special, strerror(errno));
if ((wbytes = write(fd, p, len)) < 0)
fatal("%s: %s", special, strerror(errno));
if (wbytes != len)
fatal("%s: short write (%d, not %d)", special, wbytes, len);
}
/*
* Create the root directory for this file system and the lost+found
* directory.
*/
static daddr_t
make_dinode(ino, dip, nblocks, saddr, lfsp)
ino_t ino; /* inode we're creating */
struct dinode *dip; /* disk inode */
int nblocks; /* number of blocks in file */
daddr_t saddr; /* starting block address */
struct lfs *lfsp; /* superblock */
{
int db_per_fb, i;
dip->di_nlink = 1;
dip->di_blocks = nblocks << lfsp->lfs_fsbtodb;
dip->di_size = (nblocks << lfsp->lfs_bshift);
dip->di_atime = dip->di_mtime = dip->di_ctime = lfsp->lfs_tstamp;
dip->di_atimensec = dip->di_mtimensec = dip->di_ctimensec = 0;
dip->di_inumber = ino;
#define SEGERR \
"File requires more than the number of direct blocks; increase block or segment size."
if (NDADDR < nblocks)
fatal("%s", SEGERR);
/* Assign the block addresses for the ifile */
db_per_fb = 1 << lfsp->lfs_fsbtodb;
for (i = 0; i < nblocks; i++, saddr += db_per_fb)
dip->di_db[i] = saddr;
return (saddr);
}
/*
* Construct a set of directory entries in "bufp". We assume that all the
* entries in protodir fir in the first DIRBLKSIZ.
*/
static void
make_dir(bufp, protodir, entries)
void *bufp;
struct direct *protodir;
int entries;
{
char *cp;
int i, spcleft;
spcleft = DIRBLKSIZ;
for (cp = bufp, i = 0; i < entries - 1; i++) {
protodir[i].d_reclen = DIRSIZ(NEWDIRFMT, &protodir[i], 0);
memmove(cp, &protodir[i], protodir[i].d_reclen);
cp += protodir[i].d_reclen;
if ((spcleft -= protodir[i].d_reclen) < 0)
fatal("%s: %s", special, "directory too big");
}
protodir[i].d_reclen = spcleft;
memmove(cp, &protodir[i], DIRSIZ(NEWDIRFMT, &protodir[i], 0));
}
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