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e8f10fd55c
freebsd/sbin/fsck_ffs/pass5.c
Xin LI c0ed8991fb Make background fsck based summary adjustments actually work by 
initializing the sysctl mibs data before actually using them.

The original patchset (which is the actual version that is running
on my testboxes) have checked whether all of these sysctls and
refuses to do background fsck if we don't have them.  Kirk has
pointed out that refusing running fsck on old kernels is pointless,
as old kernels will recompute the summary at mount time, so I
have removed these checks.

Unfortunatelly, as the checks will initialize the mib values of
those sysctl's, and which are vital for the runtime summary
adjustment to work, we can not simply remove the check, which
will lead to problem when running background fsck over a dirty
volume.  Add these checks in a different way: give a warning rather
than refusing to work, and complain if the functionality is not
available when adjustments are necessary.

Noticed by:	A power failure at my lab
Pointy hat:	me
MFC After:	3 days
2005-03-07 08:42:49 +00:00

533 lines
15 KiB
C
Raw Blame History

/*
* Copyright (c) 1980, 1986, 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.
* 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.
*/
#if 0
#ifndef lint
static const char sccsid[] = "@(#)pass5.c 8.9 (Berkeley) 4/28/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/sysctl.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <inttypes.h>
#include <limits.h>
#include <string.h>
#include "fsck.h"
static void check_maps(u_char *, u_char *, int, int, const char *, int *, int, int);
void
pass5(void)
{
int c, i, j, blk, frags, basesize, mapsize;
int inomapsize, blkmapsize;
struct fs *fs = &sblock;
struct cg *cg = &cgrp;
ufs2_daddr_t d, dbase, dmax;
int excessdirs, rewritecg = 0;
struct csum *cs;
struct csum_total cstotal;
struct inodesc idesc[3];
char buf[MAXBSIZE];
struct cg *newcg = (struct cg *)buf;
inoinfo(WINO)->ino_state = USTATE;
memset(newcg, 0, (size_t)fs->fs_cgsize);
newcg->cg_niblk = fs->fs_ipg;
if (cvtlevel >= 3) {
if (fs->fs_maxcontig < 2 && fs->fs_contigsumsize > 0) {
if (preen)
pwarn("DELETING CLUSTERING MAPS\n");
if (preen || reply("DELETE CLUSTERING MAPS")) {
fs->fs_contigsumsize = 0;
rewritecg = 1;
sbdirty();
}
}
if (fs->fs_maxcontig > 1) {
const char *doit = 0;
if (fs->fs_contigsumsize < 1) {
doit = "CREAT";
} else if (fs->fs_contigsumsize < fs->fs_maxcontig &&
fs->fs_contigsumsize < FS_MAXCONTIG) {
doit = "EXPAND";
}
if (doit) {
i = fs->fs_contigsumsize;
fs->fs_contigsumsize =
MIN(fs->fs_maxcontig, FS_MAXCONTIG);
if (CGSIZE(fs) > (u_int)fs->fs_bsize) {
pwarn("CANNOT %s CLUSTER MAPS\n", doit);
fs->fs_contigsumsize = i;
} else if (preen ||
reply("CREATE CLUSTER MAPS")) {
if (preen)
pwarn("%sING CLUSTER MAPS\n",
doit);
fs->fs_cgsize =
fragroundup(fs, CGSIZE(fs));
rewritecg = 1;
sbdirty();
}
}
}
}
basesize = &newcg->cg_space[0] - (u_char *)(&newcg->cg_firstfield);
if (sblock.fs_magic == FS_UFS2_MAGIC) {
newcg->cg_iusedoff = basesize;
} else {
/*
* We reserve the space for the old rotation summary
* tables for the benefit of old kernels, but do not
* maintain them in modern kernels. In time, they can
* go away.
*/
newcg->cg_old_btotoff = basesize;
newcg->cg_old_boff = newcg->cg_old_btotoff +
fs->fs_old_cpg * sizeof(int32_t);
newcg->cg_iusedoff = newcg->cg_old_boff +
fs->fs_old_cpg * fs->fs_old_nrpos * sizeof(u_int16_t);
memset(&newcg->cg_space[0], 0, newcg->cg_iusedoff - basesize);
}
inomapsize = howmany(fs->fs_ipg, CHAR_BIT);
newcg->cg_freeoff = newcg->cg_iusedoff + inomapsize;
blkmapsize = howmany(fs->fs_fpg, CHAR_BIT);
newcg->cg_nextfreeoff = newcg->cg_freeoff + blkmapsize;
if (fs->fs_contigsumsize > 0) {
newcg->cg_clustersumoff = newcg->cg_nextfreeoff -
sizeof(u_int32_t);
newcg->cg_clustersumoff =
roundup(newcg->cg_clustersumoff, sizeof(u_int32_t));
newcg->cg_clusteroff = newcg->cg_clustersumoff +
(fs->fs_contigsumsize + 1) * sizeof(u_int32_t);
newcg->cg_nextfreeoff = newcg->cg_clusteroff +
howmany(fragstoblks(fs, fs->fs_fpg), CHAR_BIT);
}
newcg->cg_magic = CG_MAGIC;
mapsize = newcg->cg_nextfreeoff - newcg->cg_iusedoff;
memset(&idesc[0], 0, sizeof idesc);
for (i = 0; i < 3; i++)
idesc[i].id_type = ADDR;
memset(&cstotal, 0, sizeof(struct csum_total));
dmax = blknum(fs, fs->fs_size + fs->fs_frag - 1);
for (d = fs->fs_size; d < dmax; d++)
setbmap(d);
for (c = 0; c < fs->fs_ncg; c++) {
if (got_siginfo) {
printf("%s: phase 5: cyl group %d of %d (%d%%)\n",
cdevname, c, sblock.fs_ncg,
c * 100 / sblock.fs_ncg);
got_siginfo = 0;
}
if (got_sigalarm) {
setproctitle("%s p5 %d%%", cdevname,
c * 100 / sblock.fs_ncg);
got_sigalarm = 0;
}
getblk(&cgblk, cgtod(fs, c), fs->fs_cgsize);
if (!cg_chkmagic(cg))
pfatal("CG %d: BAD MAGIC NUMBER\n", c);
newcg->cg_time = cg->cg_time;
newcg->cg_old_time = cg->cg_old_time;
newcg->cg_cgx = c;
dbase = cgbase(fs, c);
dmax = dbase + fs->fs_fpg;
if (dmax > fs->fs_size)
dmax = fs->fs_size;
newcg->cg_ndblk = dmax - dbase;
if (fs->fs_magic == FS_UFS1_MAGIC) {
if (c == fs->fs_ncg - 1)
newcg->cg_old_ncyl = howmany(newcg->cg_ndblk,
fs->fs_fpg / fs->fs_old_cpg);
else
newcg->cg_old_ncyl = fs->fs_old_cpg;
newcg->cg_old_niblk = fs->fs_ipg;
newcg->cg_niblk = 0;
}
if (fs->fs_contigsumsize > 0)
newcg->cg_nclusterblks = newcg->cg_ndblk / fs->fs_frag;
newcg->cg_cs.cs_ndir = 0;
newcg->cg_cs.cs_nffree = 0;
newcg->cg_cs.cs_nbfree = 0;
newcg->cg_cs.cs_nifree = fs->fs_ipg;
if (cg->cg_rotor >= 0 && cg->cg_rotor < newcg->cg_ndblk)
newcg->cg_rotor = cg->cg_rotor;
else
newcg->cg_rotor = 0;
if (cg->cg_frotor >= 0 && cg->cg_frotor < newcg->cg_ndblk)
newcg->cg_frotor = cg->cg_frotor;
else
newcg->cg_frotor = 0;
if (cg->cg_irotor >= 0 && cg->cg_irotor < fs->fs_ipg)
newcg->cg_irotor = cg->cg_irotor;
else
newcg->cg_irotor = 0;
if (fs->fs_magic == FS_UFS1_MAGIC) {
newcg->cg_initediblk = 0;
} else {
if ((unsigned)cg->cg_initediblk > fs->fs_ipg)
newcg->cg_initediblk = fs->fs_ipg;
else
newcg->cg_initediblk = cg->cg_initediblk;
}
memset(&newcg->cg_frsum[0], 0, sizeof newcg->cg_frsum);
memset(cg_inosused(newcg), 0, (size_t)(mapsize));
j = fs->fs_ipg * c;
for (i = 0; i < inostathead[c].il_numalloced; j++, i++) {
switch (inoinfo(j)->ino_state) {
case USTATE:
break;
case DSTATE:
case DCLEAR:
case DFOUND:
case DZLINK:
newcg->cg_cs.cs_ndir++;
/* FALLTHROUGH */
case FSTATE:
case FCLEAR:
case FZLINK:
newcg->cg_cs.cs_nifree--;
setbit(cg_inosused(newcg), i);
break;
default:
if (j < (int)ROOTINO)
break;
errx(EEXIT, "BAD STATE %d FOR INODE I=%d",
inoinfo(j)->ino_state, j);
}
}
if (c == 0)
for (i = 0; i < (int)ROOTINO; i++) {
setbit(cg_inosused(newcg), i);
newcg->cg_cs.cs_nifree--;
}
for (i = 0, d = dbase;
d < dmax;
d += fs->fs_frag, i += fs->fs_frag) {
frags = 0;
for (j = 0; j < fs->fs_frag; j++) {
if (testbmap(d + j))
continue;
setbit(cg_blksfree(newcg), i + j);
frags++;
}
if (frags == fs->fs_frag) {
newcg->cg_cs.cs_nbfree++;
if (fs->fs_contigsumsize > 0)
setbit(cg_clustersfree(newcg),
i / fs->fs_frag);
} else if (frags > 0) {
newcg->cg_cs.cs_nffree += frags;
blk = blkmap(fs, cg_blksfree(newcg), i);
ffs_fragacct(fs, blk, newcg->cg_frsum, 1);
}
}
if (fs->fs_contigsumsize > 0) {
int32_t *sump = cg_clustersum(newcg);
u_char *mapp = cg_clustersfree(newcg);
int map = *mapp++;
int bit = 1;
int run = 0;
for (i = 0; i < newcg->cg_nclusterblks; i++) {
if ((map & bit) != 0) {
run++;
} else if (run != 0) {
if (run > fs->fs_contigsumsize)
run = fs->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 > fs->fs_contigsumsize)
run = fs->fs_contigsumsize;
sump[run]++;
}
}
cstotal.cs_nffree += newcg->cg_cs.cs_nffree;
cstotal.cs_nbfree += newcg->cg_cs.cs_nbfree;
cstotal.cs_nifree += newcg->cg_cs.cs_nifree;
cstotal.cs_ndir += newcg->cg_cs.cs_ndir;
cs = &fs->fs_cs(fs, c);
if (cursnapshot == 0 &&
memcmp(&newcg->cg_cs, cs, sizeof *cs) != 0 &&
dofix(&idesc[0], "FREE BLK COUNT(S) WRONG IN SUPERBLK")) {
memmove(cs, &newcg->cg_cs, sizeof *cs);
sbdirty();
}
if (rewritecg) {
memmove(cg, newcg, (size_t)fs->fs_cgsize);
cgdirty();
continue;
}
if (cursnapshot == 0 &&
memcmp(newcg, cg, basesize) != 0 &&
dofix(&idesc[2], "SUMMARY INFORMATION BAD")) {
memmove(cg, newcg, (size_t)basesize);
cgdirty();
}
if (bkgrdflag != 0 || usedsoftdep || debug) {
excessdirs = cg->cg_cs.cs_ndir - newcg->cg_cs.cs_ndir;
if (excessdirs < 0) {
pfatal("LOST %d DIRECTORIES\n", -excessdirs);
excessdirs = 0;
}
if (excessdirs > 0)
check_maps(cg_inosused(newcg), cg_inosused(cg),
inomapsize, cg->cg_cgx * fs->fs_ipg, "DIR",
freedirs, 0, excessdirs);
check_maps(cg_inosused(newcg), cg_inosused(cg),
inomapsize, cg->cg_cgx * fs->fs_ipg, "FILE",
freefiles, excessdirs, fs->fs_ipg);
check_maps(cg_blksfree(cg), cg_blksfree(newcg),
blkmapsize, cg->cg_cgx * fs->fs_fpg, "FRAG",
freeblks, 0, fs->fs_fpg);
}
if (cursnapshot == 0 &&
memcmp(cg_inosused(newcg), cg_inosused(cg), mapsize) != 0 &&
dofix(&idesc[1], "BLK(S) MISSING IN BIT MAPS")) {
memmove(cg_inosused(cg), cg_inosused(newcg),
(size_t)mapsize);
cgdirty();
}
}
if (cursnapshot == 0 &&
memcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal) != 0
&& dofix(&idesc[0], "SUMMARY BLK COUNT(S) WRONG IN SUPERBLK")) {
memmove(&fs->fs_cstotal, &cstotal, sizeof cstotal);
fs->fs_ronly = 0;
fs->fs_fmod = 0;
sbdirty();
}
/*
* When doing background fsck on a snapshot, figure out whether
* the superblock summary is inaccurate and correct it when
* necessary.
*/
if (cursnapshot != 0) {
cmd.size = 1;
cmd.value = cstotal.cs_ndir - fs->fs_cstotal.cs_ndir;
if (cmd.value != 0) {
if (debug)
printf("adjndir by %+" PRIi64 "\n", cmd.value);
if (bkgrdsumadj == 0 || sysctl(adjndir, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST NUMBER OF DIRECTORIES", cmd.value);
}
cmd.value = cstotal.cs_nbfree - fs->fs_cstotal.cs_nbfree;
if (cmd.value != 0) {
if (debug)
printf("adjnbfree by %+" PRIi64 "\n", cmd.value);
if (bkgrdsumadj == 0 || sysctl(adjnbfree, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST NUMBER OF FREE BLOCKS", cmd.value);
}
cmd.value = cstotal.cs_nifree - fs->fs_cstotal.cs_nifree;
if (cmd.value != 0) {
if (debug)
printf("adjnifree by %+" PRIi64 "\n", cmd.value);
if (bkgrdsumadj == 0 || sysctl(adjnifree, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST NUMBER OF FREE INODES", cmd.value);
}
cmd.value = cstotal.cs_nffree - fs->fs_cstotal.cs_nffree;
if (cmd.value != 0) {
if (debug)
printf("adjnffree by %+" PRIi64 "\n", cmd.value);
if (bkgrdsumadj == 0 || sysctl(adjnffree, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST NUMBER OF FREE FRAGS", cmd.value);
}
cmd.value = cstotal.cs_numclusters - fs->fs_cstotal.cs_numclusters;
if (cmd.value != 0) {
if (debug)
printf("adjnumclusters by %+" PRIi64 "\n", cmd.value);
if (bkgrdsumadj == 0 || sysctl(adjnumclusters, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST NUMBER OF FREE CLUSTERS", cmd.value);
}
}
}
static void
check_maps(
u_char *map1, /* map of claimed allocations */
u_char *map2, /* map of determined allocations */
int mapsize, /* size of above two maps */
int startvalue, /* resource value for first element in map */
const char *name, /* name of resource found in maps */
int *opcode, /* sysctl opcode to free resource */
int skip, /* number of entries to skip before starting to free */
int limit) /* limit on number of entries to free */
{
# define BUFSIZE 16
char buf[BUFSIZE];
long i, j, k, l, m, n, size;
int astart, aend, ustart, uend;
void (*msg)(const char *fmt, ...);
if (bkgrdflag)
msg = pfatal;
else
msg = pwarn;
astart = ustart = aend = uend = -1;
for (i = 0; i < mapsize; i++) {
j = *map1++;
k = *map2++;
if (j == k)
continue;
for (m = 0, l = 1; m < CHAR_BIT; m++, l <<= 1) {
if ((j & l) == (k & l))
continue;
n = startvalue + i * CHAR_BIT + m;
if ((j & l) != 0) {
if (astart == -1) {
astart = aend = n;
continue;
}
if (aend + 1 == n) {
aend = n;
continue;
}
if (astart == aend)
(*msg)("ALLOCATED %s %d MARKED FREE\n",
name, astart);
else
(*msg)("%s %sS %d-%d MARKED FREE\n",
"ALLOCATED", name, astart, aend);
astart = aend = n;
} else {
if (ustart == -1) {
ustart = uend = n;
continue;
}
if (uend + 1 == n) {
uend = n;
continue;
}
size = uend - ustart + 1;
if (size <= skip) {
skip -= size;
ustart = uend = n;
continue;
}
if (skip > 0) {
ustart += skip;
size -= skip;
skip = 0;
}
if (size > limit)
size = limit;
if (debug && size == 1)
pwarn("%s %s %d MARKED USED\n",
"UNALLOCATED", name, ustart);
else if (debug)
pwarn("%s %sS %d-%ld MARKED USED\n",
"UNALLOCATED", name, ustart,
ustart + size - 1);
if (bkgrdflag != 0) {
cmd.value = ustart;
cmd.size = size;
if (sysctl(opcode, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1) {
snprintf(buf, BUFSIZE,
"FREE %s", name);
rwerror(buf, cmd.value);
}
}
limit -= size;
if (limit <= 0)
return;
ustart = uend = n;
}
}
}
if (astart != -1) {
if (astart == aend)
(*msg)("ALLOCATED %s %d MARKED FREE\n", name, astart);
else
(*msg)("ALLOCATED %sS %d-%d MARKED FREE\n",
name, astart, aend);
}
if (ustart != -1) {
size = uend - ustart + 1;
if (size <= skip)
return;
if (skip > 0) {
ustart += skip;
size -= skip;
}
if (size > limit)
size = limit;
if (debug) {
if (size == 1)
pwarn("UNALLOCATED %s %d MARKED USED\n",
name, ustart);
else
pwarn("UNALLOCATED %sS %d-%ld MARKED USED\n",
name, ustart, ustart + size - 1);
}
if (bkgrdflag != 0) {
cmd.value = ustart;
cmd.size = size;
if (sysctl(opcode, MIBSIZE, 0, 0, &cmd,
sizeof cmd) == -1) {
snprintf(buf, BUFSIZE, "FREE %s", name);
rwerror(buf, cmd.value);
}
}
}
}
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