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freebsd-skq/sbin/growfs/growfs.c
delphij db5542d7fa Use arc4random() instead of random(). 
MFC after:	2 weeks
2013-04-15 05:39:21 +00:00

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/*
* Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
* Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christoph Herrmann and Thomas-Henning von Kamptz, Munich and Frankfurt.
*
* Portions of this software were developed by Edward Tomasz Napierala
* under sponsorship from the FreeBSD Foundation.
*
* 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 acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors, as well as Christoph
* Herrmann and Thomas-Henning von Kamptz.
* 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.
*
* $TSHeader: src/sbin/growfs/growfs.c,v 1.5 2000/12/12 19:31:00 tomsoft Exp $
*
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz\n\
Copyright (c) 1980, 1989, 1993 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/disk.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <stdio.h>
#include <paths.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <fstab.h>
#include <inttypes.h>
#include <limits.h>
#include <mntopts.h>
#include <paths.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <libutil.h>
#include "debug.h"
#ifdef FS_DEBUG
int _dbg_lvl_ = (DL_INFO); /* DL_TRC */
#endif /* FS_DEBUG */
static union {
struct fs fs;
char pad[SBLOCKSIZE];
} fsun1, fsun2;
#define sblock fsun1.fs /* the new superblock */
#define osblock fsun2.fs /* the old superblock */
/*
* Possible superblock locations ordered from most to least likely.
*/
static int sblock_try[] = SBLOCKSEARCH;
static ufs2_daddr_t sblockloc;
static union {
struct cg cg;
char pad[MAXBSIZE];
} cgun1, cgun2;
#define acg cgun1.cg /* a cylinder cgroup (new) */
#define aocg cgun2.cg /* an old cylinder group */
static struct csum *fscs; /* cylinder summary */
static void growfs(int, int, unsigned int);
static void rdfs(ufs2_daddr_t, size_t, void *, int);
static void wtfs(ufs2_daddr_t, size_t, void *, int, unsigned int);
static int charsperline(void);
static void usage(void);
static int isblock(struct fs *, unsigned char *, int);
static void clrblock(struct fs *, unsigned char *, int);
static void setblock(struct fs *, unsigned char *, int);
static void initcg(int, time_t, int, unsigned int);
static void updjcg(int, time_t, int, int, unsigned int);
static void updcsloc(time_t, int, int, unsigned int);
static void frag_adjust(ufs2_daddr_t, int);
static void updclst(int);
static void mount_reload(const struct statfs *stfs);
/*
* Here we actually start growing the file system. We basically read the
* cylinder summary from the first cylinder group as we want to update
* this on the fly during our various operations. First we handle the
* changes in the former last cylinder group. Afterwards we create all new
* cylinder groups. Now we handle the cylinder group containing the
* cylinder summary which might result in a relocation of the whole
* structure. In the end we write back the updated cylinder summary, the
* new superblock, and slightly patched versions of the super block
* copies.
*/
static void
growfs(int fsi, int fso, unsigned int Nflag)
{
DBG_FUNC("growfs")
time_t modtime;
uint cylno;
int i, j, width;
char tmpbuf[100];
DBG_ENTER;
time(&modtime);
/*
* Get the cylinder summary into the memory.
*/
fscs = (struct csum *)calloc((size_t)1, (size_t)sblock.fs_cssize);
if (fscs == NULL)
errx(1, "calloc failed");
for (i = 0; i < osblock.fs_cssize; i += osblock.fs_bsize) {
rdfs(fsbtodb(&osblock, osblock.fs_csaddr +
numfrags(&osblock, i)), (size_t)MIN(osblock.fs_cssize - i,
osblock.fs_bsize), (void *)(((char *)fscs) + i), fsi);
}
#ifdef FS_DEBUG
{
struct csum *dbg_csp;
int dbg_csc;
char dbg_line[80];
dbg_csp = fscs;
for (dbg_csc = 0; dbg_csc < osblock.fs_ncg; dbg_csc++) {
snprintf(dbg_line, sizeof(dbg_line),
"%d. old csum in old location", dbg_csc);
DBG_DUMP_CSUM(&osblock, dbg_line, dbg_csp++);
}
}
#endif /* FS_DEBUG */
DBG_PRINT0("fscs read\n");
/*
* Do all needed changes in the former last cylinder group.
*/
updjcg(osblock.fs_ncg - 1, modtime, fsi, fso, Nflag);
/*
* Dump out summary information about file system.
*/
#ifdef FS_DEBUG
#define B2MBFACTOR (1 / (1024.0 * 1024.0))
printf("growfs: %.1fMB (%jd sectors) block size %d, fragment size %d\n",
(float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
(intmax_t)fsbtodb(&sblock, sblock.fs_size), sblock.fs_bsize,
sblock.fs_fsize);
printf("\tusing %d cylinder groups of %.2fMB, %d blks, %d inodes.\n",
sblock.fs_ncg, (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
sblock.fs_fpg / sblock.fs_frag, sblock.fs_ipg);
if (sblock.fs_flags & FS_DOSOFTDEP)
printf("\twith soft updates\n");
#undef B2MBFACTOR
#endif /* FS_DEBUG */
/*
* Now build the cylinders group blocks and
* then print out indices of cylinder groups.
*/
printf("super-block backups (for fsck -b #) at:\n");
i = 0;
width = charsperline();
/*
* Iterate for only the new cylinder groups.
*/
for (cylno = osblock.fs_ncg; cylno < sblock.fs_ncg; cylno++) {
initcg(cylno, modtime, fso, Nflag);
j = sprintf(tmpbuf, " %jd%s",
(intmax_t)fsbtodb(&sblock, cgsblock(&sblock, cylno)),
cylno < (sblock.fs_ncg - 1) ? "," : "" );
if (i + j >= width) {
printf("\n");
i = 0;
}
i += j;
printf("%s", tmpbuf);
fflush(stdout);
}
printf("\n");
/*
* Do all needed changes in the first cylinder group.
* allocate blocks in new location
*/
updcsloc(modtime, fsi, fso, Nflag);
/*
* Now write the cylinder summary back to disk.
*/
for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize) {
wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)),
(size_t)MIN(sblock.fs_cssize - i, sblock.fs_bsize),
(void *)(((char *)fscs) + i), fso, Nflag);
}
DBG_PRINT0("fscs written\n");
#ifdef FS_DEBUG
{
struct csum *dbg_csp;
int dbg_csc;
char dbg_line[80];
dbg_csp = fscs;
for (dbg_csc = 0; dbg_csc < sblock.fs_ncg; dbg_csc++) {
snprintf(dbg_line, sizeof(dbg_line),
"%d. new csum in new location", dbg_csc);
DBG_DUMP_CSUM(&sblock, dbg_line, dbg_csp++);
}
}
#endif /* FS_DEBUG */
/*
* Now write the new superblock back to disk.
*/
sblock.fs_time = modtime;
wtfs(sblockloc, (size_t)SBLOCKSIZE, (void *)&sblock, fso, Nflag);
DBG_PRINT0("sblock written\n");
DBG_DUMP_FS(&sblock, "new initial sblock");
/*
* Clean up the dynamic fields in our superblock copies.
*/
sblock.fs_fmod = 0;
sblock.fs_clean = 1;
sblock.fs_ronly = 0;
sblock.fs_cgrotor = 0;
sblock.fs_state = 0;
memset((void *)&sblock.fs_fsmnt, 0, sizeof(sblock.fs_fsmnt));
sblock.fs_flags &= FS_DOSOFTDEP;
/*
* XXX
* The following fields are currently distributed from the superblock
* to the copies:
* fs_minfree
* fs_rotdelay
* fs_maxcontig
* fs_maxbpg
* fs_minfree,
* fs_optim
* fs_flags regarding SOFTPDATES
*
* We probably should rather change the summary for the cylinder group
* statistics here to the value of what would be in there, if the file
* system were created initially with the new size. Therefor we still
* need to find an easy way of calculating that.
* Possibly we can try to read the first superblock copy and apply the
* "diffed" stats between the old and new superblock by still copying
* certain parameters onto that.
*/
/*
* Write out the duplicate super blocks.
*/
for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)),
(size_t)SBLOCKSIZE, (void *)&sblock, fso, Nflag);
}
DBG_PRINT0("sblock copies written\n");
DBG_DUMP_FS(&sblock, "new other sblocks");
DBG_LEAVE;
return;
}
/*
* This creates a new cylinder group structure, for more details please see
* the source of newfs(8), as this function is taken over almost unchanged.
* As this is never called for the first cylinder group, the special
* provisions for that case are removed here.
*/
static void
initcg(int cylno, time_t modtime, int fso, unsigned int Nflag)
{
DBG_FUNC("initcg")
static caddr_t iobuf;
long blkno, start;
ino_t ino;
ufs2_daddr_t i, cbase, dmax;
struct ufs1_dinode *dp1;
struct csum *cs;
uint j, d, dupper, dlower;
if (iobuf == NULL && (iobuf = malloc(sblock.fs_bsize * 3)) == NULL)
errx(37, "panic: cannot allocate I/O buffer");
/*
* Determine block bounds for cylinder group.
* Allow space for super block summary information in first
* cylinder group.
*/
cbase = cgbase(&sblock, cylno);
dmax = cbase + sblock.fs_fpg;
if (dmax > sblock.fs_size)
dmax = sblock.fs_size;
dlower = cgsblock(&sblock, cylno) - cbase;
dupper = cgdmin(&sblock, cylno) - cbase;
if (cylno == 0) /* XXX fscs may be relocated */
dupper += howmany(sblock.fs_cssize, sblock.fs_fsize);
cs = &fscs[cylno];
memset(&acg, 0, sblock.fs_cgsize);
acg.cg_time = modtime;
acg.cg_magic = CG_MAGIC;
acg.cg_cgx = cylno;
acg.cg_niblk = sblock.fs_ipg;
acg.cg_initediblk = sblock.fs_ipg < 2 * INOPB(&sblock) ?
sblock.fs_ipg : 2 * INOPB(&sblock);
acg.cg_ndblk = dmax - cbase;
if (sblock.fs_contigsumsize > 0)
acg.cg_nclusterblks = acg.cg_ndblk / sblock.fs_frag;
start = &acg.cg_space[0] - (u_char *)(&acg.cg_firstfield);
if (sblock.fs_magic == FS_UFS2_MAGIC) {
acg.cg_iusedoff = start;
} else {
acg.cg_old_ncyl = sblock.fs_old_cpg;
acg.cg_old_time = acg.cg_time;
acg.cg_time = 0;
acg.cg_old_niblk = acg.cg_niblk;
acg.cg_niblk = 0;
acg.cg_initediblk = 0;
acg.cg_old_btotoff = start;
acg.cg_old_boff = acg.cg_old_btotoff +
sblock.fs_old_cpg * sizeof(int32_t);
acg.cg_iusedoff = acg.cg_old_boff +
sblock.fs_old_cpg * sizeof(u_int16_t);
}
acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
acg.cg_nextfreeoff = acg.cg_freeoff + howmany(sblock.fs_fpg, CHAR_BIT);
if (sblock.fs_contigsumsize > 0) {
acg.cg_clustersumoff =
roundup(acg.cg_nextfreeoff, sizeof(u_int32_t));
acg.cg_clustersumoff -= sizeof(u_int32_t);
acg.cg_clusteroff = acg.cg_clustersumoff +
(sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
acg.cg_nextfreeoff = acg.cg_clusteroff +
howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
}
if (acg.cg_nextfreeoff > (unsigned)sblock.fs_cgsize) {
/*
* This should never happen as we would have had that panic
* already on file system creation
*/
errx(37, "panic: cylinder group too big");
}
acg.cg_cs.cs_nifree += sblock.fs_ipg;
if (cylno == 0)
for (ino = 0; ino < ROOTINO; ino++) {
setbit(cg_inosused(&acg), ino);
acg.cg_cs.cs_nifree--;
}
/*
* For the old file system, we have to initialize all the inodes.
*/
if (sblock.fs_magic == FS_UFS1_MAGIC) {
bzero(iobuf, sblock.fs_bsize);
for (i = 0; i < sblock.fs_ipg / INOPF(&sblock);
i += sblock.fs_frag) {
dp1 = (struct ufs1_dinode *)(void *)iobuf;
for (j = 0; j < INOPB(&sblock); j++) {
dp1->di_gen = arc4random();
dp1++;
}
wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i),
sblock.fs_bsize, iobuf, fso, Nflag);
}
}
if (cylno > 0) {
/*
* In cylno 0, beginning space is reserved
* for boot and super blocks.
*/
for (d = 0; d < dlower; d += sblock.fs_frag) {
blkno = d / sblock.fs_frag;
setblock(&sblock, cg_blksfree(&acg), blkno);
if (sblock.fs_contigsumsize > 0)
setbit(cg_clustersfree(&acg), blkno);
acg.cg_cs.cs_nbfree++;
}
sblock.fs_dsize += dlower;
}
sblock.fs_dsize += acg.cg_ndblk - dupper;
if ((i = dupper % sblock.fs_frag)) {
acg.cg_frsum[sblock.fs_frag - i]++;
for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) {
setbit(cg_blksfree(&acg), dupper);
acg.cg_cs.cs_nffree++;
}
}
for (d = dupper; d + sblock.fs_frag <= acg.cg_ndblk;
d += sblock.fs_frag) {
blkno = d / sblock.fs_frag;
setblock(&sblock, cg_blksfree(&acg), blkno);
if (sblock.fs_contigsumsize > 0)
setbit(cg_clustersfree(&acg), blkno);
acg.cg_cs.cs_nbfree++;
}
if (d < acg.cg_ndblk) {
acg.cg_frsum[acg.cg_ndblk - d]++;
for (; d < acg.cg_ndblk; d++) {
setbit(cg_blksfree(&acg), d);
acg.cg_cs.cs_nffree++;
}
}
if (sblock.fs_contigsumsize > 0) {
int32_t *sump = cg_clustersum(&acg);
u_char *mapp = cg_clustersfree(&acg);
int map = *mapp++;
int bit = 1;
int run = 0;
for (i = 0; i < acg.cg_nclusterblks; i++) {
if ((map & bit) != 0)
run++;
else if (run != 0) {
if (run > sblock.fs_contigsumsize)
run = sblock.fs_contigsumsize;
sump[run]++;
run = 0;
}
if ((i & (CHAR_BIT - 1)) != CHAR_BIT - 1)
bit <<= 1;
else {
map = *mapp++;
bit = 1;
}
}
if (run != 0) {
if (run > sblock.fs_contigsumsize)
run = sblock.fs_contigsumsize;
sump[run]++;
}
}
sblock.fs_cstotal.cs_ndir += acg.cg_cs.cs_ndir;
sblock.fs_cstotal.cs_nffree += acg.cg_cs.cs_nffree;
sblock.fs_cstotal.cs_nbfree += acg.cg_cs.cs_nbfree;
sblock.fs_cstotal.cs_nifree += acg.cg_cs.cs_nifree;
*cs = acg.cg_cs;
memcpy(iobuf, &acg, sblock.fs_cgsize);
memset(iobuf + sblock.fs_cgsize, '\0',
sblock.fs_bsize * 3 - sblock.fs_cgsize);
wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)),
sblock.fs_bsize * 3, iobuf, fso, Nflag);
DBG_DUMP_CG(&sblock, "new cg", &acg);
DBG_LEAVE;
return;
}
/*
* Here we add or subtract (sign +1/-1) the available fragments in a given
* block to or from the fragment statistics. By subtracting before and adding
* after an operation on the free frag map we can easy update the fragment
* statistic, which seems to be otherwise a rather complex operation.
*/
static void
frag_adjust(ufs2_daddr_t frag, int sign)
{
DBG_FUNC("frag_adjust")
int fragsize;
int f;
DBG_ENTER;
fragsize = 0;
/*
* Here frag only needs to point to any fragment in the block we want
* to examine.
*/
for (f = rounddown(frag, sblock.fs_frag);
f < roundup(frag + 1, sblock.fs_frag); f++) {
/*
* Count contiguous free fragments.
*/
if (isset(cg_blksfree(&acg), f)) {
fragsize++;
} else {
if (fragsize && fragsize < sblock.fs_frag) {
/*
* We found something in between.
*/
acg.cg_frsum[fragsize] += sign;
DBG_PRINT2("frag_adjust [%d]+=%d\n",
fragsize, sign);
}
fragsize = 0;
}
}
if (fragsize && fragsize < sblock.fs_frag) {
/*
* We found something.
*/
acg.cg_frsum[fragsize] += sign;
DBG_PRINT2("frag_adjust [%d]+=%d\n", fragsize, sign);
}
DBG_PRINT2("frag_adjust [[%d]]+=%d\n", fragsize, sign);
DBG_LEAVE;
return;
}
/*
* Here we do all needed work for the former last cylinder group. It has to be
* changed in any case, even if the file system ended exactly on the end of
* this group, as there is some slightly inconsistent handling of the number
* of cylinders in the cylinder group. We start again by reading the cylinder
* group from disk. If the last block was not fully available, we first handle
* the missing fragments, then we handle all new full blocks in that file
* system and finally we handle the new last fragmented block in the file
* system. We again have to handle the fragment statistics rotational layout
* tables and cluster summary during all those operations.
*/
static void
updjcg(int cylno, time_t modtime, int fsi, int fso, unsigned int Nflag)
{
DBG_FUNC("updjcg")
ufs2_daddr_t cbase, dmax, dupper;
struct csum *cs;
int i, k;
int j = 0;
DBG_ENTER;
/*
* Read the former last (joining) cylinder group from disk, and make
* a copy.
*/
rdfs(fsbtodb(&osblock, cgtod(&osblock, cylno)),
(size_t)osblock.fs_cgsize, (void *)&aocg, fsi);
DBG_PRINT0("jcg read\n");
DBG_DUMP_CG(&sblock, "old joining cg", &aocg);
memcpy((void *)&cgun1, (void *)&cgun2, sizeof(cgun2));
/*
* If the cylinder group had already its new final size almost
* nothing is to be done ... except:
* For some reason the value of cg_ncyl in the last cylinder group has
* to be zero instead of fs_cpg. As this is now no longer the last
* cylinder group we have to change that value now to fs_cpg.
*/
if (cgbase(&osblock, cylno + 1) == osblock.fs_size) {
if (sblock.fs_magic == FS_UFS1_MAGIC)
acg.cg_old_ncyl = sblock.fs_old_cpg;
wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("jcg written\n");
DBG_DUMP_CG(&sblock, "new joining cg", &acg);
DBG_LEAVE;
return;
}
/*
* Set up some variables needed later.
*/
cbase = cgbase(&sblock, cylno);
dmax = cbase + sblock.fs_fpg;
if (dmax > sblock.fs_size)
dmax = sblock.fs_size;
dupper = cgdmin(&sblock, cylno) - cbase;
if (cylno == 0) /* XXX fscs may be relocated */
dupper += howmany(sblock.fs_cssize, sblock.fs_fsize);
/*
* Set pointer to the cylinder summary for our cylinder group.
*/
cs = fscs + cylno;
/*
* Touch the cylinder group, update all fields in the cylinder group as
* needed, update the free space in the superblock.
*/
acg.cg_time = modtime;
if ((unsigned)cylno == sblock.fs_ncg - 1) {
/*
* This is still the last cylinder group.
*/
if (sblock.fs_magic == FS_UFS1_MAGIC)
acg.cg_old_ncyl =
sblock.fs_old_ncyl % sblock.fs_old_cpg;
} else {
acg.cg_old_ncyl = sblock.fs_old_cpg;
}
DBG_PRINT2("jcg dbg: %d %u", cylno, sblock.fs_ncg);
#ifdef FS_DEBUG
if (sblock.fs_magic == FS_UFS1_MAGIC)
DBG_PRINT2("%d %u", acg.cg_old_ncyl, sblock.fs_old_cpg);
#endif
DBG_PRINT0("\n");
acg.cg_ndblk = dmax - cbase;
sblock.fs_dsize += acg.cg_ndblk - aocg.cg_ndblk;
if (sblock.fs_contigsumsize > 0)
acg.cg_nclusterblks = acg.cg_ndblk / sblock.fs_frag;
/*
* Now we have to update the free fragment bitmap for our new free
* space. There again we have to handle the fragmentation and also
* the rotational layout tables and the cluster summary. This is
* also done per fragment for the first new block if the old file
* system end was not on a block boundary, per fragment for the new
* last block if the new file system end is not on a block boundary,
* and per block for all space in between.
*
* Handle the first new block here if it was partially available
* before.
*/
if (osblock.fs_size % sblock.fs_frag) {
if (roundup(osblock.fs_size, sblock.fs_frag) <=
sblock.fs_size) {
/*
* The new space is enough to fill at least this
* block
*/
j = 0;
for (i = roundup(osblock.fs_size - cbase,
sblock.fs_frag) - 1; i >= osblock.fs_size - cbase;
i--) {
setbit(cg_blksfree(&acg), i);
acg.cg_cs.cs_nffree++;
j++;
}
/*
* Check if the fragment just created could join an
* already existing fragment at the former end of the
* file system.
*/
if (isblock(&sblock, cg_blksfree(&acg),
((osblock.fs_size - cgbase(&sblock, cylno)) /
sblock.fs_frag))) {
/*
* The block is now completely available.
*/
DBG_PRINT0("block was\n");
acg.cg_frsum[osblock.fs_size % sblock.fs_frag]--;
acg.cg_cs.cs_nbfree++;
acg.cg_cs.cs_nffree -= sblock.fs_frag;
k = rounddown(osblock.fs_size - cbase,
sblock.fs_frag);
updclst((osblock.fs_size - cbase) /
sblock.fs_frag);
} else {
/*
* Lets rejoin a possible partially growed
* fragment.
*/
k = 0;
while (isset(cg_blksfree(&acg), i) &&
(i >= rounddown(osblock.fs_size - cbase,
sblock.fs_frag))) {
i--;
k++;
}
if (k)
acg.cg_frsum[k]--;
acg.cg_frsum[k + j]++;
}
} else {
/*
* We only grow by some fragments within this last
* block.
*/
for (i = sblock.fs_size - cbase - 1;
i >= osblock.fs_size - cbase; i--) {
setbit(cg_blksfree(&acg), i);
acg.cg_cs.cs_nffree++;
j++;
}
/*
* Lets rejoin a possible partially growed fragment.
*/
k = 0;
while (isset(cg_blksfree(&acg), i) &&
(i >= rounddown(osblock.fs_size - cbase,
sblock.fs_frag))) {
i--;
k++;
}
if (k)
acg.cg_frsum[k]--;
acg.cg_frsum[k + j]++;
}
}
/*
* Handle all new complete blocks here.
*/
for (i = roundup(osblock.fs_size - cbase, sblock.fs_frag);
i + sblock.fs_frag <= dmax - cbase; /* XXX <= or only < ? */
i += sblock.fs_frag) {
j = i / sblock.fs_frag;
setblock(&sblock, cg_blksfree(&acg), j);
updclst(j);
acg.cg_cs.cs_nbfree++;
}
/*
* Handle the last new block if there are stll some new fragments left.
* Here we don't have to bother about the cluster summary or the even
* the rotational layout table.
*/
if (i < (dmax - cbase)) {
acg.cg_frsum[dmax - cbase - i]++;
for (; i < dmax - cbase; i++) {
setbit(cg_blksfree(&acg), i);
acg.cg_cs.cs_nffree++;
}
}
sblock.fs_cstotal.cs_nffree +=
(acg.cg_cs.cs_nffree - aocg.cg_cs.cs_nffree);
sblock.fs_cstotal.cs_nbfree +=
(acg.cg_cs.cs_nbfree - aocg.cg_cs.cs_nbfree);
/*
* The following statistics are not changed here:
* sblock.fs_cstotal.cs_ndir
* sblock.fs_cstotal.cs_nifree
* As the statistics for this cylinder group are ready, copy it to
* the summary information array.
*/
*cs = acg.cg_cs;
/*
* Write the updated "joining" cylinder group back to disk.
*/
wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)), (size_t)sblock.fs_cgsize,
(void *)&acg, fso, Nflag);
DBG_PRINT0("jcg written\n");
DBG_DUMP_CG(&sblock, "new joining cg", &acg);
DBG_LEAVE;
return;
}
/*
* Here we update the location of the cylinder summary. We have two possible
* ways of growing the cylinder summary:
* (1) We can try to grow the summary in the current location, and relocate
* possibly used blocks within the current cylinder group.
* (2) Alternatively we can relocate the whole cylinder summary to the first
* new completely empty cylinder group. Once the cylinder summary is no
* longer in the beginning of the first cylinder group you should never
* use a version of fsck which is not aware of the possibility to have
* this structure in a non standard place.
* Option (2) is considered to be less intrusive to the structure of the file-
* system, so that's the one being used.
*/
static void
updcsloc(time_t modtime, int fsi, int fso, unsigned int Nflag)
{
DBG_FUNC("updcsloc")
struct csum *cs;
int ocscg, ncscg;
ufs2_daddr_t d;
int lcs = 0;
int block;
DBG_ENTER;
if (howmany(sblock.fs_cssize, sblock.fs_fsize) ==
howmany(osblock.fs_cssize, osblock.fs_fsize)) {
/*
* No new fragment needed.
*/
DBG_LEAVE;
return;
}
ocscg = dtog(&osblock, osblock.fs_csaddr);
cs = fscs + ocscg;
/*
* Read original cylinder group from disk, and make a copy.
* XXX If Nflag is set in some very rare cases we now miss
* some changes done in updjcg by reading the unmodified
* block from disk.
*/
rdfs(fsbtodb(&osblock, cgtod(&osblock, ocscg)),
(size_t)osblock.fs_cgsize, (void *)&aocg, fsi);
DBG_PRINT0("oscg read\n");
DBG_DUMP_CG(&sblock, "old summary cg", &aocg);
memcpy((void *)&cgun1, (void *)&cgun2, sizeof(cgun2));
/*
* Touch the cylinder group, set up local variables needed later
* and update the superblock.
*/
acg.cg_time = modtime;
/*
* XXX In the case of having active snapshots we may need much more
* blocks for the copy on write. We need each block twice, and
* also up to 8*3 blocks for indirect blocks for all possible
* references.
*/
/*
* There is not enough space in the old cylinder group to
* relocate all blocks as needed, so we relocate the whole
* cylinder group summary to a new group. We try to use the
* first complete new cylinder group just created. Within the
* cylinder group we align the area immediately after the
* cylinder group information location in order to be as
* close as possible to the original implementation of ffs.
*
* First we have to make sure we'll find enough space in the
* new cylinder group. If not, then we currently give up.
* We start with freeing everything which was used by the
* fragments of the old cylinder summary in the current group.
* Now we write back the group meta data, read in the needed
* meta data from the new cylinder group, and start allocating
* within that group. Here we can assume, the group to be
* completely empty. Which makes the handling of fragments and
* clusters a lot easier.
*/
DBG_TRC;
if (sblock.fs_ncg - osblock.fs_ncg < 2)
errx(2, "panic: not enough space");
/*
* Point "d" to the first fragment not used by the cylinder
* summary.
*/
d = osblock.fs_csaddr + (osblock.fs_cssize / osblock.fs_fsize);
/*
* Set up last cluster size ("lcs") already here. Calculate
* the size for the trailing cluster just behind where "d"
* points to.
*/
if (sblock.fs_contigsumsize > 0) {
for (block = howmany(d % sblock.fs_fpg, sblock.fs_frag),
lcs = 0; lcs < sblock.fs_contigsumsize; block++, lcs++) {
if (isclr(cg_clustersfree(&acg), block))
break;
}
}
/*
* Point "d" to the last frag used by the cylinder summary.
*/
d--;
DBG_PRINT1("d=%jd\n", (intmax_t)d);
if ((d + 1) % sblock.fs_frag) {
/*
* The end of the cylinder summary is not a complete
* block.
*/
DBG_TRC;
frag_adjust(d % sblock.fs_fpg, -1);
for (; (d + 1) % sblock.fs_frag; d--) {
DBG_PRINT1("d=%jd\n", (intmax_t)d);
setbit(cg_blksfree(&acg), d % sblock.fs_fpg);
acg.cg_cs.cs_nffree++;
sblock.fs_cstotal.cs_nffree++;
}
/*
* Point "d" to the last fragment of the last
* (incomplete) block of the cylinder summary.
*/
d++;
frag_adjust(d % sblock.fs_fpg, 1);
if (isblock(&sblock, cg_blksfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag)) {
DBG_PRINT1("d=%jd\n", (intmax_t)d);
acg.cg_cs.cs_nffree -= sblock.fs_frag;
acg.cg_cs.cs_nbfree++;
sblock.fs_cstotal.cs_nffree -= sblock.fs_frag;
sblock.fs_cstotal.cs_nbfree++;
if (sblock.fs_contigsumsize > 0) {
setbit(cg_clustersfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
if (lcs < sblock.fs_contigsumsize) {
if (lcs)
cg_clustersum(&acg)[lcs]--;
lcs++;
cg_clustersum(&acg)[lcs]++;
}
}
}
/*
* Point "d" to the first fragment of the block before
* the last incomplete block.
*/
d--;
}
DBG_PRINT1("d=%jd\n", (intmax_t)d);
for (d = rounddown(d, sblock.fs_frag); d >= osblock.fs_csaddr;
d -= sblock.fs_frag) {
DBG_TRC;
DBG_PRINT1("d=%jd\n", (intmax_t)d);
setblock(&sblock, cg_blksfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
acg.cg_cs.cs_nbfree++;
sblock.fs_cstotal.cs_nbfree++;
if (sblock.fs_contigsumsize > 0) {
setbit(cg_clustersfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
/*
* The last cluster size is already set up.
*/
if (lcs < sblock.fs_contigsumsize) {
if (lcs)
cg_clustersum(&acg)[lcs]--;
lcs++;
cg_clustersum(&acg)[lcs]++;
}
}
}
*cs = acg.cg_cs;
/*
* Now write the former cylinder group containing the cylinder
* summary back to disk.
*/
wtfs(fsbtodb(&sblock, cgtod(&sblock, ocscg)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("oscg written\n");
DBG_DUMP_CG(&sblock, "old summary cg", &acg);
/*
* Find the beginning of the new cylinder group containing the
* cylinder summary.
*/
sblock.fs_csaddr = cgdmin(&sblock, osblock.fs_ncg);
ncscg = dtog(&sblock, sblock.fs_csaddr);
cs = fscs + ncscg;
/*
* If Nflag is specified, we would now read random data instead
* of an empty cg structure from disk. So we can't simulate that
* part for now.
*/
if (Nflag) {
DBG_PRINT0("nscg update skipped\n");
DBG_LEAVE;
return;
}
/*
* Read the future cylinder group containing the cylinder
* summary from disk, and make a copy.
*/
rdfs(fsbtodb(&sblock, cgtod(&sblock, ncscg)),
(size_t)sblock.fs_cgsize, (void *)&aocg, fsi);
DBG_PRINT0("nscg read\n");
DBG_DUMP_CG(&sblock, "new summary cg", &aocg);
memcpy((void *)&cgun1, (void *)&cgun2, sizeof(cgun2));
/*
* Allocate all complete blocks used by the new cylinder
* summary.
*/
for (d = sblock.fs_csaddr; d + sblock.fs_frag <=
sblock.fs_csaddr + (sblock.fs_cssize / sblock.fs_fsize);
d += sblock.fs_frag) {
clrblock(&sblock, cg_blksfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
acg.cg_cs.cs_nbfree--;
sblock.fs_cstotal.cs_nbfree--;
if (sblock.fs_contigsumsize > 0) {
clrbit(cg_clustersfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
}
}
/*
* Allocate all fragments used by the cylinder summary in the
* last block.
*/
if (d < sblock.fs_csaddr + (sblock.fs_cssize / sblock.fs_fsize)) {
for (; d - sblock.fs_csaddr <
sblock.fs_cssize/sblock.fs_fsize; d++) {
clrbit(cg_blksfree(&acg), d % sblock.fs_fpg);
acg.cg_cs.cs_nffree--;
sblock.fs_cstotal.cs_nffree--;
}
acg.cg_cs.cs_nbfree--;
acg.cg_cs.cs_nffree += sblock.fs_frag;
sblock.fs_cstotal.cs_nbfree--;
sblock.fs_cstotal.cs_nffree += sblock.fs_frag;
if (sblock.fs_contigsumsize > 0)
clrbit(cg_clustersfree(&acg),
(d % sblock.fs_fpg) / sblock.fs_frag);
frag_adjust(d % sblock.fs_fpg, 1);
}
/*
* XXX Handle the cluster statistics here in the case this
* cylinder group is now almost full, and the remaining
* space is less then the maximum cluster size. This is
* probably not needed, as you would hardly find a file
* system which has only MAXCSBUFS+FS_MAXCONTIG of free
* space right behind the cylinder group information in
* any new cylinder group.
*/
/*
* Update our statistics in the cylinder summary.
*/
*cs = acg.cg_cs;
/*
* Write the new cylinder group containing the cylinder summary
* back to disk.
*/
wtfs(fsbtodb(&sblock, cgtod(&sblock, ncscg)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("nscg written\n");
DBG_DUMP_CG(&sblock, "new summary cg", &acg);
DBG_LEAVE;
return;
}
/*
* Here we read some block(s) from disk.
*/
static void
rdfs(ufs2_daddr_t bno, size_t size, void *bf, int fsi)
{
DBG_FUNC("rdfs")
ssize_t n;
DBG_ENTER;
if (bno < 0)
err(32, "rdfs: attempting to read negative block number");
if (lseek(fsi, (off_t)bno * DEV_BSIZE, 0) < 0)
err(33, "rdfs: seek error: %jd", (intmax_t)bno);
n = read(fsi, bf, size);
if (n != (ssize_t)size)
err(34, "rdfs: read error: %jd", (intmax_t)bno);
DBG_LEAVE;
return;
}
/*
* Here we write some block(s) to disk.
*/
static void
wtfs(ufs2_daddr_t bno, size_t size, void *bf, int fso, unsigned int Nflag)
{
DBG_FUNC("wtfs")
ssize_t n;
DBG_ENTER;
if (Nflag) {
DBG_LEAVE;
return;
}
if (lseek(fso, (off_t)bno * DEV_BSIZE, SEEK_SET) < 0)
err(35, "wtfs: seek error: %ld", (long)bno);
n = write(fso, bf, size);
if (n != (ssize_t)size)
err(36, "wtfs: write error: %ld", (long)bno);
DBG_LEAVE;
return;
}
/*
* Here we check if all frags of a block are free. For more details again
* please see the source of newfs(8), as this function is taken over almost
* unchanged.
*/
static int
isblock(struct fs *fs, unsigned char *cp, int h)
{
DBG_FUNC("isblock")
unsigned char mask;
DBG_ENTER;
switch (fs->fs_frag) {
case 8:
DBG_LEAVE;
return (cp[h] == 0xff);
case 4:
mask = 0x0f << ((h & 0x1) << 2);
DBG_LEAVE;
return ((cp[h >> 1] & mask) == mask);
case 2:
mask = 0x03 << ((h & 0x3) << 1);
DBG_LEAVE;
return ((cp[h >> 2] & mask) == mask);
case 1:
mask = 0x01 << (h & 0x7);
DBG_LEAVE;
return ((cp[h >> 3] & mask) == mask);
default:
fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag);
DBG_LEAVE;
return (0);
}
}
/*
* Here we allocate a complete block in the block map. For more details again
* please see the source of newfs(8), as this function is taken over almost
* unchanged.
*/
static void
clrblock(struct fs *fs, unsigned char *cp, int h)
{
DBG_FUNC("clrblock")
DBG_ENTER;
switch ((fs)->fs_frag) {
case 8:
cp[h] = 0;
break;
case 4:
cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
break;
case 2:
cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
break;
case 1:
cp[h >> 3] &= ~(0x01 << (h & 0x7));
break;
default:
warnx("clrblock bad fs_frag %d", fs->fs_frag);
break;
}
DBG_LEAVE;
return;
}
/*
* Here we free a complete block in the free block map. For more details again
* please see the source of newfs(8), as this function is taken over almost
* unchanged.
*/
static void
setblock(struct fs *fs, unsigned char *cp, int h)
{
DBG_FUNC("setblock")
DBG_ENTER;
switch (fs->fs_frag) {
case 8:
cp[h] = 0xff;
break;
case 4:
cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
break;
case 2:
cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
break;
case 1:
cp[h >> 3] |= (0x01 << (h & 0x7));
break;
default:
warnx("setblock bad fs_frag %d", fs->fs_frag);
break;
}
DBG_LEAVE;
return;
}
/*
* Figure out how many lines our current terminal has. For more details again
* please see the source of newfs(8), as this function is taken over almost
* unchanged.
*/
static int
charsperline(void)
{
DBG_FUNC("charsperline")
int columns;
char *cp;
struct winsize ws;
DBG_ENTER;
columns = 0;
if (ioctl(0, TIOCGWINSZ, &ws) != -1)
columns = ws.ws_col;
if (columns == 0 && (cp = getenv("COLUMNS")))
columns = atoi(cp);
if (columns == 0)
columns = 80; /* last resort */
DBG_LEAVE;
return (columns);
}
static int
is_dev(const char *name)
{
struct stat devstat;
if (stat(name, &devstat) != 0)
return (0);
if (!S_ISCHR(devstat.st_mode))
return (0);
return (1);
}
/*
* Return mountpoint on which the device is currently mounted.
*/
static const struct statfs *
dev_to_statfs(const char *dev)
{
struct stat devstat, mntdevstat;
struct statfs *mntbuf, *statfsp;
char device[MAXPATHLEN];
char *mntdevname;
int i, mntsize;
/*
* First check the mounted filesystems.
*/
if (stat(dev, &devstat) != 0)
return (NULL);
if (!S_ISCHR(devstat.st_mode) && !S_ISBLK(devstat.st_mode))
return (NULL);
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
mntdevname = statfsp->f_mntfromname;
if (*mntdevname != '/') {
strcpy(device, _PATH_DEV);
strcat(device, mntdevname);
mntdevname = device;
}
if (stat(mntdevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
return (NULL);
}
static const char *
mountpoint_to_dev(const char *mountpoint)
{
struct statfs *mntbuf, *statfsp;
struct fstab *fs;
int i, mntsize;
/*
* First check the mounted filesystems.
*/
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
if (strcmp(statfsp->f_mntonname, mountpoint) == 0)
return (statfsp->f_mntfromname);
}
/*
* Check the fstab.
*/
fs = getfsfile(mountpoint);
if (fs != NULL)
return (fs->fs_spec);
return (NULL);
}
static const char *
getdev(const char *name)
{
static char device[MAXPATHLEN];
const char *cp, *dev;
if (is_dev(name))
return (name);
cp = strrchr(name, '/');
if (cp == 0) {
snprintf(device, sizeof(device), "%s%s", _PATH_DEV, name);
if (is_dev(device))
return (device);
}
dev = mountpoint_to_dev(name);
if (dev != NULL && is_dev(dev))
return (dev);
return (NULL);
}
/*
* growfs(8) is a utility which allows to increase the size of an existing
* ufs file system. Currently this can only be done on unmounted file system.
* It recognizes some command line options to specify the new desired size,
* and it does some basic checkings. The old file system size is determined
* and after some more checks like we can really access the new last block
* on the disk etc. we calculate the new parameters for the superblock. After
* having done this we just call growfs() which will do the work.
* We still have to provide support for snapshots. Therefore we first have to
* understand what data structures are always replicated in the snapshot on
* creation, for all other blocks we touch during our procedure, we have to
* keep the old blocks unchanged somewhere available for the snapshots. If we
* are lucky, then we only have to handle our blocks to be relocated in that
* way.
* Also we have to consider in what order we actually update the critical
* data structures of the file system to make sure, that in case of a disaster
* fsck(8) is still able to restore any lost data.
* The foreseen last step then will be to provide for growing even mounted
* file systems. There we have to extend the mount() system call to provide
* userland access to the file system locking facility.
*/
int
main(int argc, char **argv)
{
DBG_FUNC("main")
const char *device;
const struct statfs *statfsp;
uint64_t size = 0;
off_t mediasize;
int error, i, j, fsi, fso, ch, Nflag = 0, yflag = 0;
char *p, reply[5], oldsizebuf[6], newsizebuf[6];
void *testbuf;
DBG_ENTER;
while ((ch = getopt(argc, argv, "Ns:vy")) != -1) {
switch(ch) {
case 'N':
Nflag = 1;
break;
case 's':
size = (off_t)strtoumax(optarg, &p, 0);
if (p == NULL || *p == '\0')
size *= DEV_BSIZE;
else if (*p == 'b' || *p == 'B')
; /* do nothing */
else if (*p == 'k' || *p == 'K')
size <<= 10;
else if (*p == 'm' || *p == 'M')
size <<= 20;
else if (*p == 'g' || *p == 'G')
size <<= 30;
else if (*p == 't' || *p == 'T') {
size <<= 30;
size <<= 10;
} else
errx(1, "unknown suffix on -s argument");
break;
case 'v': /* for compatibility to newfs */
break;
case 'y':
yflag = 1;
break;
case '?':
/* FALLTHROUGH */
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
/*
* Now try to guess the device name.
*/
device = getdev(*argv);
if (device == NULL)
errx(1, "cannot find special device for %s", *argv);
statfsp = dev_to_statfs(device);
fsi = open(device, O_RDONLY);
if (fsi < 0)
err(1, "%s", device);
/*
* Try to guess the slice size if not specified.
*/
if (ioctl(fsi, DIOCGMEDIASIZE, &mediasize) == -1)
err(1,"DIOCGMEDIASIZE");
/*
* Check if that partition is suitable for growing a file system.
*/
if (mediasize < 1)
errx(1, "partition is unavailable");
/*
* Read the current superblock, and take a backup.
*/
for (i = 0; sblock_try[i] != -1; i++) {
sblockloc = sblock_try[i] / DEV_BSIZE;
rdfs(sblockloc, (size_t)SBLOCKSIZE, (void *)&(osblock), fsi);
if ((osblock.fs_magic == FS_UFS1_MAGIC ||
(osblock.fs_magic == FS_UFS2_MAGIC &&
osblock.fs_sblockloc == sblock_try[i])) &&
osblock.fs_bsize <= MAXBSIZE &&
osblock.fs_bsize >= (int32_t) sizeof(struct fs))
break;
}
if (sblock_try[i] == -1)
errx(1, "superblock not recognized");
memcpy((void *)&fsun1, (void *)&fsun2, sizeof(fsun2));
DBG_OPEN("/tmp/growfs.debug"); /* already here we need a superblock */
DBG_DUMP_FS(&sblock, "old sblock");
/*
* Determine size to grow to. Default to the device size.
*/
if (size == 0)
size = mediasize;
else {
if (size > (uint64_t)mediasize) {
humanize_number(oldsizebuf, sizeof(oldsizebuf), size,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
humanize_number(newsizebuf, sizeof(newsizebuf),
mediasize,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
errx(1, "requested size %s is larger "
"than the available %s", oldsizebuf, newsizebuf);
}
}
/*
* Make sure the new size is a multiple of fs_fsize; /dev/ufssuspend
* only supports fragment-aligned IO requests.
*/
size -= size % osblock.fs_fsize;
if (size <= (uint64_t)(osblock.fs_size * osblock.fs_fsize)) {
humanize_number(oldsizebuf, sizeof(oldsizebuf),
osblock.fs_size * osblock.fs_fsize,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
humanize_number(newsizebuf, sizeof(newsizebuf), size,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
errx(1, "requested size %s is not larger than the current "
"filesystem size %s", newsizebuf, oldsizebuf);
}
sblock.fs_size = dbtofsb(&osblock, size / DEV_BSIZE);
sblock.fs_providersize = dbtofsb(&osblock, mediasize / DEV_BSIZE);
/*
* Are we really growing?
*/
if (osblock.fs_size >= sblock.fs_size) {
errx(1, "we are not growing (%jd->%jd)",
(intmax_t)osblock.fs_size, (intmax_t)sblock.fs_size);
}
/*
* Check if we find an active snapshot.
*/
if (yflag == 0) {
for (j = 0; j < FSMAXSNAP; j++) {
if (sblock.fs_snapinum[j]) {
errx(1, "active snapshot found in file system; "
"please remove all snapshots before "
"using growfs");
}
if (!sblock.fs_snapinum[j]) /* list is dense */
break;
}
}
if (yflag == 0 && Nflag == 0) {
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) == 0)
printf("Device is mounted read-write; resizing will "
"result in temporary write suspension for %s.\n",
statfsp->f_mntonname);
printf("It's strongly recommended to make a backup "
"before growing the file system.\n"
"OK to grow filesystem on %s", device);
if (statfsp != NULL)
printf(", mounted on %s,", statfsp->f_mntonname);
humanize_number(oldsizebuf, sizeof(oldsizebuf),
osblock.fs_size * osblock.fs_fsize,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
humanize_number(newsizebuf, sizeof(newsizebuf),
sblock.fs_size * sblock.fs_fsize,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
printf(" from %s to %s? [Yes/No] ", oldsizebuf, newsizebuf);
fflush(stdout);
fgets(reply, (int)sizeof(reply), stdin);
if (strcmp(reply, "Yes\n")){
printf("\nNothing done\n");
exit (0);
}
}
/*
* Try to access our device for writing. If it's not mounted,
* or mounted read-only, simply open it; otherwise, use UFS
* suspension mechanism.
*/
if (Nflag) {
fso = -1;
} else {
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) == 0) {
fso = open(_PATH_UFSSUSPEND, O_RDWR);
if (fso == -1)
err(1, "unable to open %s", _PATH_UFSSUSPEND);
error = ioctl(fso, UFSSUSPEND, &statfsp->f_fsid);
if (error != 0)
err(1, "UFSSUSPEND");
} else {
fso = open(device, O_WRONLY);
if (fso < 0)
err(1, "%s", device);
}
}
/*
* Try to access our new last block in the file system.
*/
testbuf = malloc(sblock.fs_fsize);
if (testbuf == NULL)
err(1, "malloc");
rdfs((ufs2_daddr_t)((size - sblock.fs_fsize) / DEV_BSIZE),
sblock.fs_fsize, testbuf, fsi);
wtfs((ufs2_daddr_t)((size - sblock.fs_fsize) / DEV_BSIZE),
sblock.fs_fsize, testbuf, fso, Nflag);
free(testbuf);
/*
* Now calculate new superblock values and check for reasonable
* bound for new file system size:
* fs_size: is derived from user input
* fs_dsize: should get updated in the routines creating or
* updating the cylinder groups on the fly
* fs_cstotal: should get updated in the routines creating or
* updating the cylinder groups
*/
/*
* Update the number of cylinders and cylinder groups in the file system.
*/
if (sblock.fs_magic == FS_UFS1_MAGIC) {
sblock.fs_old_ncyl =
sblock.fs_size * sblock.fs_old_nspf / sblock.fs_old_spc;
if (sblock.fs_size * sblock.fs_old_nspf >
sblock.fs_old_ncyl * sblock.fs_old_spc)
sblock.fs_old_ncyl++;
}
sblock.fs_ncg = howmany(sblock.fs_size, sblock.fs_fpg);
/*
* Allocate last cylinder group only if there is enough room
* for at least one data block.
*/
if (sblock.fs_size % sblock.fs_fpg != 0 &&
sblock.fs_size <= cgdmin(&sblock, sblock.fs_ncg - 1)) {
humanize_number(oldsizebuf, sizeof(oldsizebuf),
(sblock.fs_size % sblock.fs_fpg) * sblock.fs_fsize,
"B", HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
warnx("no room to allocate last cylinder group; "
"leaving %s unused", oldsizebuf);
sblock.fs_ncg--;
if (sblock.fs_magic == FS_UFS1_MAGIC)
sblock.fs_old_ncyl = sblock.fs_ncg * sblock.fs_old_cpg;
sblock.fs_size = sblock.fs_ncg * sblock.fs_fpg;
}
/*
* Update the space for the cylinder group summary information in the
* respective cylinder group data area.
*/
sblock.fs_cssize =
fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));
if (osblock.fs_size >= sblock.fs_size)
errx(1, "not enough new space");
DBG_PRINT0("sblock calculated\n");
/*
* Ok, everything prepared, so now let's do the tricks.
*/
growfs(fsi, fso, Nflag);
close(fsi);
if (fso > -1) {
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) == 0) {
error = ioctl(fso, UFSRESUME);
if (error != 0)
err(1, "UFSRESUME");
}
error = close(fso);
if (error != 0)
err(1, "close");
if (statfsp != NULL && (statfsp->f_flags & MNT_RDONLY) != 0)
mount_reload(statfsp);
}
DBG_CLOSE;
DBG_LEAVE;
return (0);
}
/*
* Dump a line of usage.
*/
static void
usage(void)
{
DBG_FUNC("usage")
DBG_ENTER;
fprintf(stderr, "usage: growfs [-Ny] [-s size] special | filesystem\n");
DBG_LEAVE;
exit(1);
}
/*
* This updates most parameters and the bitmap related to cluster. We have to
* assume that sblock, osblock, acg are set up.
*/
static void
updclst(int block)
{
DBG_FUNC("updclst")
static int lcs = 0;
DBG_ENTER;
if (sblock.fs_contigsumsize < 1) /* no clustering */
return;
/*
* update cluster allocation map
*/
setbit(cg_clustersfree(&acg), block);
/*
* update cluster summary table
*/
if (!lcs) {
/*
* calculate size for the trailing cluster
*/
for (block--; lcs < sblock.fs_contigsumsize; block--, lcs++ ) {
if (isclr(cg_clustersfree(&acg), block))
break;
}
}
if (lcs < sblock.fs_contigsumsize) {
if (lcs)
cg_clustersum(&acg)[lcs]--;
lcs++;
cg_clustersum(&acg)[lcs]++;
}
DBG_LEAVE;
return;
}
static void
mount_reload(const struct statfs *stfs)
{
char errmsg[255];
struct iovec *iov;
int iovlen;
iov = NULL;
iovlen = 0;
*errmsg = '\0';
build_iovec(&iov, &iovlen, "fstype", __DECONST(char *, "ffs"), 4);
build_iovec(&iov, &iovlen, "fspath", __DECONST(char *, stfs->f_mntonname), (size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "reload", NULL, 0);
if (nmount(iov, iovlen, stfs->f_flags) < 0) {
errmsg[sizeof(errmsg) - 1] = '\0';
err(9, "%s: cannot reload filesystem%s%s", stfs->f_mntonname,
*errmsg != '\0' ? ": " : "", errmsg);
}
}
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