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NetBSD/sbin/newfs_lfs/lfs.c

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/* $NetBSD: lfs.c,v 1.20 2000/10/11 21:02:05 he 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 1.20 2000/10/11 21:02:05 he Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#define FSTYPENAMES
#include <sys/disklabel.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/dinode.h>
#include <ufs/lfs/lfs.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "config.h"
#include "extern.h"
extern int Nflag; /* Don't write anything */
daddr_t *ifib = NULL; /* Ifile single indirect block (lbn -NDADDR) */
/*
* 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_dlfs */
/* dlfs_magic */ LFS_MAGIC,
/* dlfs_version */ LFS_VERSION,
/* dlfs_size */ 0,
/* dlfs_ssize */ DFL_LFSSEG/DFL_LFSBLOCK,
/* dlfs_dsize */ 0,
/* dlfs_bsize */ DFL_LFSBLOCK,
/* dlfs_fsize */ DFL_LFSFRAG,
/* dlfs_frag */ DFL_LFSBLOCK/DFL_LFSFRAG,
/* dlfs_free */ LFS_FIRST_INUM,
/* dlfs_bfree */ 0,
/* dlfs_nfiles */ 0,
/* dlfs_avail */ 0,
/* dlfs_uinodes */ 0,
/* dlfs_idaddr */ 0,
/* dlfs_ifile */ LFS_IFILE_INUM,
/* dlfs_lastseg */ 0,
/* dlfs_nextseg */ 0,
/* dlfs_curseg */ 0,
/* dlfs_offset */ 0,
/* dlfs_lastpseg */ 0,
/* dlfs_tstamp */ 0,
/* dlfs_minfree */ MINFREE,
/* dlfs_maxfilesize */ 0,
/* dlfs_dbpseg */ DFL_LFSSEG/DEV_BSIZE,
/* dlfs_inopb */ DFL_LFSBLOCK/sizeof(struct dinode),
/* dlfs_ifpb */ DFL_LFSBLOCK/sizeof(IFILE),
/* dlfs_sepb */ DFL_LFSBLOCK/sizeof(SEGUSE),
/* dlfs_nindir */ DFL_LFSBLOCK/sizeof(daddr_t),
/* dlfs_nseg */ 0,
/* dlfs_nspf */ 0,
/* dlfs_cleansz */ 0,
/* dlfs_segtabsz */ 0,
/* dlfs_segmask */ DFL_LFSSEG_MASK,
/* dlfs_segshift */ DFL_LFSSEG_SHIFT,
/* dlfs_bshift */ DFL_LFSBLOCK_SHIFT,
/* dlfs_ffshift */ DFL_LFS_FFSHIFT,
/* dlfs_fbshift */ DFL_LFS_FBSHIFT,
/* dlfs_bmask */ DFL_LFSBLOCK_MASK,
/* dlfs_ffmask */ DFL_LFS_FFMASK,
/* dlfs_fbmask */ DFL_LFS_FBMASK,
/* dlfs_fsbtodb */ 0,
/* dlfs_sushift */ 0,
/* dlfs_maxsymlinklen */ MAXSYMLINKLEN,
/* dlfs_sboffs */ { 0 },
/* dlfs_nclean */ 0,
/* dlfs_fsmnt */ { 0 },
/* dlfs_clean */ 0,
/* dlfs_dmeta */ 0,
/* dlfs_minfreeseg */ 0,
/* dlfs_pad */ { 0 },
/* dlfs_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_ronly */ 0,
/* lfs_flags */ 0
};
#define UMASK 0755
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, minfreeseg)
int fd;
struct disklabel *lp;
struct partition *partp;
int minfree;
int block_size;
int frag_size;
int seg_size;
int minfreeseg;
{
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 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 */
ufs_daddr_t *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;
off_t off; /* Offset at which to write */
int sb_interval; /* number of segs between super blocks */
off_t seg_seek; /* Seek offset for a segment */
int ssize; /* Segment size */
int sum_size; /* Size of the summary block */
int warned_segtoobig=0;
lfsp = &lfs_default;
/* If partition is not an LFS partition, warn that that is the case */
if(partp->p_fstype != FS_BSDLFS) {
fatal("partition label indicated fs type \"%s\", expected \"%s\"",
fstypenames[partp->p_fstype], fstypenames[FS_BSDLFS]);
}
if (!(bsize = block_size))
if (!(bsize = partp->p_fsize * partp->p_frag))
bsize = DFL_LFSBLOCK;
if (!(fsize = frag_size))
if (!(fsize = partp->p_fsize))
fsize = DFL_LFSFRAG;
if (!(ssize = seg_size))
if (partp->p_sgs == 0 ||
!(ssize = (partp->p_fsize * partp->p_frag) << partp->p_sgs))
{
ssize = DFL_LFSSEG;
}
/* Sanity check: fsize<=bsize<ssize */
if (fsize > bsize) {
/* Only complain if fsize was explicitly set */
if(frag_size)
fatal("fragment size must be <= block size %d", bsize);
fsize = bsize;
}
if (bsize >= ssize) {
/* Only fatal if ssize was explicitly set */
if(seg_size)
fatal("block size must be < segment size");
warnx("%s: disklabel segment size (%d) too small, using default (%d)",
progname, ssize, DFL_LFSSEG);
ssize = DFL_LFSSEG;
}
tryagain:
/* 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;
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_nclean = lfsp->lfs_nseg - 1;
lfsp->lfs_maxfilesize = maxtable[lfsp->lfs_bshift] << lfsp->lfs_bshift;
if (minfreeseg == 0)
lfsp->lfs_minfreeseg = lfsp->lfs_nseg / DFL_MIN_FREE_SEGS;
else
lfsp->lfs_minfreeseg = minfreeseg;
if (lfsp->lfs_minfreeseg < MIN_FREE_SEGS)
lfsp->lfs_minfreeseg = MIN_FREE_SEGS;
if(lfsp->lfs_nseg < lfsp->lfs_minfreeseg + 1
|| lfsp->lfs_nseg < LFS_MIN_SBINTERVAL + 1)
{
if(seg_size == 0 && ssize > (bsize<<1)) {
if(!warned_segtoobig) {
fprintf(stderr,"Segment size %d is too large; trying smaller sizes.\n", ssize);
if (ssize == (bsize << 16)) {
fprintf(stderr, "(Did you perhaps accidentally leave \"16\" in the disklabel's sgs field?)\n");
}
}
++warned_segtoobig;
ssize >>= 1;
goto tryagain;
}
fatal("Could not allocate enough segments with segment size %d and block size %d;\nplease decrease the segment size.\n",
ssize, lfsp->lfs_bsize);
}
printf("%.1fMB in %d segments of size %d\n",
(lfsp->lfs_nseg * (double)ssize) / 1048576.0,
lfsp->lfs_nseg, ssize);
/*
* The number of free blocks is set from the number of segments
* times the segment size - lfs_minfreesegs (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, and half a block per segment that can't
* be written due to fragmentation.
*/
lfsp->lfs_dsize = (lfsp->lfs_nseg - lfsp->lfs_minfreeseg) *
fsbtodb(lfsp, lfsp->lfs_ssize);
lfsp->lfs_bfree = lfsp->lfs_dsize;
lfsp->lfs_bfree -= fsbtodb(lfsp, lfsp->lfs_nseg / 2);
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;
/* To start, one inode block and one segsum are dirty metadata */
lfsp->lfs_dmeta = 1 + fsbtodb(lfsp, 1);
/*
* 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] = btodb(LFS_LABELPAD);
lfsp->lfs_dsize -= btodb(LFS_SBPAD);
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;
lfsp->lfs_dsize -= btodb(LFS_SBPAD);
}
/* We need >= 2 superblocks */
if(lfsp->lfs_sboffs[1] == 0x0) {
fatal("Could not assign a disk adress for the second superblock.\nPlease decrease the segment size.\n");
}
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 = ((lfsp->lfs_segtabsz + lfsp->lfs_cleansz + 1) <<
lfsp->lfs_bshift) +
2 * roundup(DIRBLKSIZ,lfsp->lfs_fsize) +
3 * DINODE_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 -= btodb(LFS_SUMMARY_SIZE);
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;
j = 1;
for (segp = segtable + 1, i = 1; i < lfsp->lfs_nseg; i++, segp++) {
if ((i % sb_interval) == 0 && j < LFS_MAXNUMSB) {
segp->su_flags = SEGUSE_SUPERBLOCK;
lfsp->lfs_bfree -= (LFS_SBPAD / lp->d_secsize);
++j;
} else
segp->su_flags = 0;
segp->su_lastmod = 0;
segp->su_nbytes = 0;
segp->su_ninos = 0;
segp->su_nsums = 0;
}
/*
* Initialize dynamic accounting.
*/
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;
/* 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)<<lfsp->lfs_fbshift,
sb_addr, lfsp);
dip->di_mode = IFREG|IREAD|IWRITE;
dip->di_flags = SF_IMMUTABLE; /* XXX KS */
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, howmany(DIRBLKSIZ,lfsp->lfs_fsize), sb_addr, lfsp);
dip->di_mode = IFDIR | UMASK;
dip->di_size = DIRBLKSIZ;
dip->di_blocks = howmany(roundup(DIRBLKSIZ,lfsp->lfs_fsize),DEV_BSIZE);
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, howmany(DIRBLKSIZ,lfsp->lfs_fsize), sb_addr, lfsp);
dip->di_mode = IFDIR | UMASK;
dip->di_size = DIRBLKSIZ;
dip->di_blocks = howmany(roundup(DIRBLKSIZ,lfsp->lfs_fsize),DEV_BSIZE);
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 */
/* Adjust blocks_used to take indirect block into account */
if(ifib) {
++blocks_used;
segtable[0].su_nbytes += lfsp->lfs_bsize;
}
/* 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);
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;
/* XXX KS - write the single indirect block */
if(ifib) {
*dp++ = ((u_long *)ifib)[0];
put(fd, off, ifib, 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];
dip = ((struct dinode *)dpagep) + 1;
put(fd, off, ipagep, dblksize(lfsp,dip,0));
off += dblksize(lfsp,dip,0);
memset(ipagep, 0, lfsp->lfs_bsize);
make_dir(ipagep, lfs_lf_dir,
sizeof(lfs_lf_dir) / sizeof(struct direct));
*dp++ = ((u_long *)ipagep)[0];
dip = ((struct dinode *)dpagep) + 2;
put(fd, off, ipagep, dblksize(lfsp,dip,0));
off += dblksize(lfsp,dip,0);
/* Write Superblock */
lfsp->lfs_offset = off / lp->d_secsize;
lfsp->lfs_avail = lfsp->lfs_dsize -
(fsbtodb(lfsp, lfsp->lfs_ssize) - btodb(LFS_SBPAD) -
(sntoda(lfsp, 1) - lfsp->lfs_offset));
lfsp->lfs_bfree = lfsp->lfs_avail; /* XXX */
/* Slop for an imperfect cleaner */
lfsp->lfs_avail += (lfsp->lfs_minfreeseg / 2) *
fsbtodb(lfsp, lfsp->lfs_ssize);
lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs));
put(fd, (off_t)LFS_LABELPAD, &(lfsp->lfs_dlfs), sizeof(struct dlfs));
/*
* Finally, calculate all the fields for the summary structure
* and write it.
*/
memset(&summary,0,sizeof(summary));
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) + 2*sizeof(daddr_t) +
(lfsp->lfs_cleansz + lfsp->lfs_segtabsz) * sizeof(ufs_daddr_t);
#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_size > NDADDR)
block_array_size++;
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;
if (block_array_size > NDADDR)
block_array[block_array_size-1] = -NDADDR;
/* 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(ufs_daddr_t));
sump += sizeof(FINFO) - sizeof(ufs_daddr_t);
memmove(sump, block_array, sizeof(ufs_daddr_t) * file_info.fi_nblocks);
sump += sizeof(ufs_daddr_t) * file_info.fi_nblocks;
/* Now, add the root directory */
dip = ((struct dinode *)dpagep) + 1;
file_info.fi_nblocks = 1;
file_info.fi_version = 1;
file_info.fi_ino = ROOTINO;
file_info.fi_blocks[0] = 0;
file_info.fi_lastlength = dblksize(lfsp, dip, 0);
memmove(sump, &file_info, sizeof(FINFO));
sump += sizeof(FINFO);
/* Now, add the lost and found */
dip = ((struct dinode *)dpagep) + 2;
file_info.fi_ino = LOSTFOUNDINO;
file_info.fi_lastlength = dblksize(lfsp, dip, 0);
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, (off_t)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;
free(dpagep);
/* Now write the summary block for the next partial so it's invalid */
sp->ss_sumsum =
cksum(&sp->ss_datasum, LFS_SUMMARY_SIZE - sizeof(sp->ss_sumsum));
put(fd, off, sp, LFS_SUMMARY_SIZE);
/* Now, write the rest of the superblocks */
lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs));
printf("super-block backups (for fsck -b #) at:\n");
for (i = 0; i < LFS_MAXNUMSB; i++) {
seg_addr = lfsp->lfs_sboffs[i];
printf("%d%s ", seg_addr, (i == LFS_MAXNUMSB - 1 ? "" : ","));
/* Leave the time stamp on the alt sb, zero the rest */
if(i == 2) {
lfsp->lfs_tstamp = 0;
lfsp->lfs_cksum = lfs_sb_cksum(&(lfsp->lfs_dlfs));
}
seg_seek = (off_t)seg_addr * lp->d_secsize;
put(fd, seg_seek, &(lfsp->lfs_dlfs), sizeof(struct dlfs));
}
printf("\n");
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 (Nflag)
return;
if (lseek(fd, off, SEEK_SET) < 0)
fatal("%s: seek: %s", special, strerror(errno));
if ((wbytes = write(fd, p, len)) < 0)
fatal("%s: write: %s", special, strerror(errno));
if (wbytes != len)
fatal("%s: short write (%d, not %ld)",
special, wbytes, (u_long) len);
}
/*
* Create the root directory for this file system and the lost+found
* directory.
*/
static daddr_t
make_dinode(ino, dip, nfrags, saddr, lfsp)
ino_t ino; /* inode we're creating */
struct dinode *dip; /* disk inode */
int nfrags; /* number of frags in file */
daddr_t saddr; /* starting block address */
struct lfs *lfsp; /* superblock */
{
int db_per_fb, i;
int nblocks;
nblocks = howmany(nfrags, lfsp->lfs_frag);
if(nblocks >= NDADDR)
nfrags = roundup(nfrags, lfsp->lfs_frag);
dip->di_nlink = 1;
dip->di_blocks = fragstodb(lfsp, nfrags);
dip->di_size = (nfrags << lfsp->lfs_ffshift);
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;
db_per_fb = 1 << lfsp->lfs_fsbtodb;
#if 0
if (NDADDR < nblocks)
fatal("File ino=%d requires more than the number of direct blocks; please increase block or segment size.",ino);
#else
if (NDADDR+NINDIR(lfsp) < nblocks) {
fatal("File ino=%d requires more blocks than can be accommodated with a single indirect block; please increase segment or block size.",ino);
} else if (NDADDR < nblocks) {
fprintf(stderr,"Using %d single indirect block(s) for inode %d\n",
(nblocks-NDADDR)/NINDIR(lfsp) + 1, ino);
dip->di_blocks += db_per_fb;
}
#endif
/* Assign the block addresses for the ifile */
for (i = 0; i < MIN(nblocks,NDADDR); i++, saddr += db_per_fb) {
dip->di_db[i] = saddr;
}
if (nfrags & lfsp->lfs_fbmask) {
/* Last block is a fragment */
saddr -= db_per_fb - fragstodb(lfsp, nfrags & lfsp->lfs_fbmask);
}
/* XXX We are only called with nblocks > 1 for Ifile */
if(ino == LFS_IFILE_INUM && nblocks > NDADDR) {
ifib = (daddr_t *)malloc(lfsp->lfs_bsize);
memset(ifib,0,lfsp->lfs_bsize);
for (i = 0; i < nblocks-NDADDR; i++, saddr += db_per_fb)
ifib[i] = saddr;
dip->di_ib[0] = saddr;
saddr += db_per_fb;
}
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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