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freebsd-dev/sbin/fsck_ffs/pass1.c
Kirk McKusick a3628327e7 Ensure that files with no allocated blocks are trimmed to zero length. 
UFS does not allow files to end with a hole; it requires that the
last block of a file be allocated. As fsck_ffs(8) initially scans
each allocated inode, it tracks the last allocated block in the
inode. It then checks that the inode's size falls in the last
allocated block. If the last allocated block falls before the size,
a `file size beyond end of allocated file' warning is issued and
the file is shortened to reference the last allocated block (to avoid
having it reference a hole at its end). If the last allocated block
falls after the size, a `partially truncated file' warning is issued
and all blocks following the block referenced by the size are freed.

Because of an incorrect unsigned comparison, this test was failing
to handle files with no allocated blocks but non-zero size (which
should have had their size reset to zero). Once that was fixed the
test started incorrectly complaining about short symbolic links
that place the link path in the inode rather than in a disk block.
Because these symbolic links have a non-zero size, but no allocated
blocks, fsck_ffs wanted to zero out their size. This patch has to
detect and avoid changing the size of such symbolic links.

Reported by:  Chuck Silvers
Tested by:    Chuck Silvers
MFC after:    1 week
Sponsored by: Netflix
2021-05-11 14:52:26 -07:00

590 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE 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[] = "@(#)pass1.c 8.6 (Berkeley) 4/28/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include "fsck.h"
static ufs2_daddr_t badblk;
static ufs2_daddr_t dupblk;
static ino_t lastino; /* last inode in use */
static int checkinode(ino_t inumber, struct inodesc *, int rebuildcg);
void
pass1(void)
{
struct inostat *info;
struct inodesc idesc;
struct bufarea *cgbp;
struct cg *cgp;
ino_t inumber, inosused, mininos;
ufs2_daddr_t i, cgd;
u_int8_t *cp;
int c, rebuildcg;
badblk = dupblk = lastino = 0;
/*
* Set file system reserved blocks in used block map.
*/
for (c = 0; c < sblock.fs_ncg; c++) {
cgd = cgdmin(&sblock, c);
if (c == 0) {
i = cgbase(&sblock, c);
} else
i = cgsblock(&sblock, c);
for (; i < cgd; i++)
setbmap(i);
}
i = sblock.fs_csaddr;
cgd = i + howmany(sblock.fs_cssize, sblock.fs_fsize);
for (; i < cgd; i++)
setbmap(i);
/*
* Find all allocated blocks.
*/
memset(&idesc, 0, sizeof(struct inodesc));
idesc.id_func = pass1check;
n_files = n_blks = 0;
for (c = 0; c < sblock.fs_ncg; c++) {
inumber = c * sblock.fs_ipg;
cgbp = cglookup(c);
cgp = cgbp->b_un.b_cg;
rebuildcg = 0;
if (!check_cgmagic(c, cgbp, 1))
rebuildcg = 1;
if (!rebuildcg && sblock.fs_magic == FS_UFS2_MAGIC) {
inosused = cgp->cg_initediblk;
if (inosused > sblock.fs_ipg) {
pfatal("Too many initialized inodes (%ju > %d) "
"in cylinder group %d\nReset to %d\n",
(uintmax_t)inosused, sblock.fs_ipg, c,
sblock.fs_ipg);
inosused = sblock.fs_ipg;
}
} else {
inosused = sblock.fs_ipg;
}
if (got_siginfo) {
printf("%s: phase 1: 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 p1 %d%%", cdevname,
c * 100 / sblock.fs_ncg);
got_sigalarm = 0;
}
/*
* If we are using soft updates, then we can trust the
* cylinder group inode allocation maps to tell us which
* inodes are allocated. We will scan the used inode map
* to find the inodes that are really in use, and then
* read only those inodes in from disk.
*/
if ((preen || inoopt) && usedsoftdep && !rebuildcg) {
cp = &cg_inosused(cgp)[(inosused - 1) / CHAR_BIT];
for ( ; inosused != 0; cp--) {
if (*cp == 0) {
if (inosused > CHAR_BIT)
inosused -= CHAR_BIT;
else
inosused = 0;
continue;
}
for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
if (*cp & i)
break;
inosused--;
}
break;
}
}
/*
* Allocate inoinfo structures for the allocated inodes.
*/
inostathead[c].il_numalloced = inosused;
if (inosused == 0) {
inostathead[c].il_stat = NULL;
continue;
}
info = Calloc((unsigned)inosused, sizeof(struct inostat));
if (info == NULL)
errx(EEXIT, "cannot alloc %u bytes for inoinfo",
(unsigned)(sizeof(struct inostat) * inosused));
inostathead[c].il_stat = info;
/*
* Scan the allocated inodes.
*/
setinodebuf(c, inosused);
for (i = 0; i < inosused; i++, inumber++) {
if (inumber < UFS_ROOTINO) {
(void)getnextinode(inumber, rebuildcg);
continue;
}
/*
* NULL return indicates probable end of allocated
* inodes during cylinder group rebuild attempt.
* We always keep trying until we get to the minimum
* valid number for this cylinder group.
*/
if (checkinode(inumber, &idesc, rebuildcg) == 0 &&
i > cgp->cg_initediblk)
break;
}
/*
* This optimization speeds up future runs of fsck
* by trimming down the number of inodes in cylinder
* groups that formerly had many inodes but now have
* fewer in use.
*/
mininos = roundup(inosused + INOPB(&sblock), INOPB(&sblock));
if (inoopt && !preen && !rebuildcg &&
sblock.fs_magic == FS_UFS2_MAGIC &&
cgp->cg_initediblk > 2 * INOPB(&sblock) &&
mininos < cgp->cg_initediblk) {
i = cgp->cg_initediblk;
if (mininos < 2 * INOPB(&sblock))
cgp->cg_initediblk = 2 * INOPB(&sblock);
else
cgp->cg_initediblk = mininos;
pwarn("CYLINDER GROUP %d: RESET FROM %ju TO %d %s\n",
c, i, cgp->cg_initediblk, "VALID INODES");
cgdirty(cgbp);
}
if (inosused < sblock.fs_ipg)
continue;
lastino += 1;
if (lastino < (c * sblock.fs_ipg))
inosused = 0;
else
inosused = lastino - (c * sblock.fs_ipg);
if (rebuildcg && inosused > cgp->cg_initediblk &&
sblock.fs_magic == FS_UFS2_MAGIC) {
cgp->cg_initediblk = roundup(inosused, INOPB(&sblock));
pwarn("CYLINDER GROUP %d: FOUND %d VALID INODES\n", c,
cgp->cg_initediblk);
}
/*
* If we were not able to determine in advance which inodes
* were in use, then reduce the size of the inoinfo structure
* to the size necessary to describe the inodes that we
* really found.
*/
if (inumber == lastino)
continue;
inostathead[c].il_numalloced = inosused;
if (inosused == 0) {
free(inostathead[c].il_stat);
inostathead[c].il_stat = NULL;
continue;
}
info = Calloc((unsigned)inosused, sizeof(struct inostat));
if (info == NULL)
errx(EEXIT, "cannot alloc %u bytes for inoinfo",
(unsigned)(sizeof(struct inostat) * inosused));
memmove(info, inostathead[c].il_stat, inosused * sizeof(*info));
free(inostathead[c].il_stat);
inostathead[c].il_stat = info;
}
freeinodebuf();
}
static int
checkinode(ino_t inumber, struct inodesc *idesc, int rebuildcg)
{
struct inode ip;
union dinode *dp;
off_t kernmaxfilesize;
ufs2_daddr_t ndb;
mode_t mode;
intmax_t size, fixsize;
int j, ret, offset;
if ((dp = getnextinode(inumber, rebuildcg)) == NULL)
goto unknown;
mode = DIP(dp, di_mode) & IFMT;
if (mode == 0) {
if ((sblock.fs_magic == FS_UFS1_MAGIC &&
(memcmp(dp->dp1.di_db, zino.dp1.di_db,
UFS_NDADDR * sizeof(ufs1_daddr_t)) ||
memcmp(dp->dp1.di_ib, zino.dp1.di_ib,
UFS_NIADDR * sizeof(ufs1_daddr_t)) ||
dp->dp1.di_mode || dp->dp1.di_size)) ||
(sblock.fs_magic == FS_UFS2_MAGIC &&
(memcmp(dp->dp2.di_db, zino.dp2.di_db,
UFS_NDADDR * sizeof(ufs2_daddr_t)) ||
memcmp(dp->dp2.di_ib, zino.dp2.di_ib,
UFS_NIADDR * sizeof(ufs2_daddr_t)) ||
dp->dp2.di_mode || dp->dp2.di_size))) {
pfatal("PARTIALLY ALLOCATED INODE I=%lu",
(u_long)inumber);
if (reply("CLEAR") == 1) {
ginode(inumber, &ip);
clearinode(ip.i_dp);
inodirty(&ip);
irelse(&ip);
}
}
inoinfo(inumber)->ino_state = USTATE;
return (1);
}
lastino = inumber;
/* This should match the file size limit in ffs_mountfs(). */
if (sblock.fs_magic == FS_UFS1_MAGIC)
kernmaxfilesize = (off_t)0x40000000 * sblock.fs_bsize - 1;
else
kernmaxfilesize = sblock.fs_maxfilesize;
if (DIP(dp, di_size) > kernmaxfilesize ||
DIP(dp, di_size) > sblock.fs_maxfilesize ||
(mode == IFDIR && DIP(dp, di_size) > MAXDIRSIZE)) {
if (debug)
printf("bad size %ju:", (uintmax_t)DIP(dp, di_size));
goto unknown;
}
if (!preen && mode == IFMT && reply("HOLD BAD BLOCK") == 1) {
ginode(inumber, &ip);
dp = ip.i_dp;
DIP_SET(dp, di_size, sblock.fs_fsize);
DIP_SET(dp, di_mode, IFREG|0600);
inodirty(&ip);
irelse(&ip);
}
if ((mode == IFBLK || mode == IFCHR || mode == IFIFO ||
mode == IFSOCK) && DIP(dp, di_size) != 0) {
if (debug)
printf("bad special-file size %ju:",
(uintmax_t)DIP(dp, di_size));
goto unknown;
}
if ((mode == IFBLK || mode == IFCHR) &&
(dev_t)DIP(dp, di_rdev) == NODEV) {
if (debug)
printf("bad special-file rdev NODEV:");
goto unknown;
}
ndb = howmany(DIP(dp, di_size), sblock.fs_bsize);
if (ndb < 0) {
if (debug)
printf("bad size %ju ndb %ju:",
(uintmax_t)DIP(dp, di_size), (uintmax_t)ndb);
goto unknown;
}
if (mode == IFBLK || mode == IFCHR)
ndb++;
if (mode == IFLNK) {
/*
* Fake ndb value so direct/indirect block checks below
* will detect any garbage after symlink string.
*/
if (DIP(dp, di_size) < (off_t)sblock.fs_maxsymlinklen) {
if (sblock.fs_magic == FS_UFS1_MAGIC)
ndb = howmany(DIP(dp, di_size),
sizeof(ufs1_daddr_t));
else
ndb = howmany(DIP(dp, di_size),
sizeof(ufs2_daddr_t));
if (ndb > UFS_NDADDR) {
j = ndb - UFS_NDADDR;
for (ndb = 1; j > 1; j--)
ndb *= NINDIR(&sblock);
ndb += UFS_NDADDR;
}
}
}
for (j = ndb; ndb < UFS_NDADDR && j < UFS_NDADDR; j++)
if (DIP(dp, di_db[j]) != 0) {
if (debug)
printf("bad direct addr[%d]: %ju\n", j,
(uintmax_t)DIP(dp, di_db[j]));
goto unknown;
}
for (j = 0, ndb -= UFS_NDADDR; ndb > 0; j++)
ndb /= NINDIR(&sblock);
for (; j < UFS_NIADDR; j++)
if (DIP(dp, di_ib[j]) != 0) {
if (debug)
printf("bad indirect addr: %ju\n",
(uintmax_t)DIP(dp, di_ib[j]));
goto unknown;
}
if (ftypeok(dp) == 0)
goto unknown;
n_files++;
inoinfo(inumber)->ino_linkcnt = DIP(dp, di_nlink);
if (mode == IFDIR) {
if (DIP(dp, di_size) == 0)
inoinfo(inumber)->ino_state = DCLEAR;
else if (DIP(dp, di_nlink) <= 0)
inoinfo(inumber)->ino_state = DZLINK;
else
inoinfo(inumber)->ino_state = DSTATE;
cacheino(dp, inumber);
countdirs++;
} else if (DIP(dp, di_nlink) <= 0)
inoinfo(inumber)->ino_state = FZLINK;
else
inoinfo(inumber)->ino_state = FSTATE;
inoinfo(inumber)->ino_type = IFTODT(mode);
badblk = dupblk = 0;
idesc->id_number = inumber;
if (DIP(dp, di_flags) & SF_SNAPSHOT)
inoinfo(inumber)->ino_idtype = SNAP;
else
inoinfo(inumber)->ino_idtype = ADDR;
idesc->id_type = inoinfo(inumber)->ino_idtype;
(void)ckinode(dp, idesc);
if (sblock.fs_magic == FS_UFS2_MAGIC && dp->dp2.di_extsize > 0) {
ndb = howmany(dp->dp2.di_extsize, sblock.fs_bsize);
for (j = 0; j < UFS_NXADDR; j++) {
if (--ndb == 0 &&
(offset = blkoff(&sblock, dp->dp2.di_extsize)) != 0)
idesc->id_numfrags = numfrags(&sblock,
fragroundup(&sblock, offset));
else
idesc->id_numfrags = sblock.fs_frag;
if (dp->dp2.di_extb[j] == 0)
continue;
idesc->id_blkno = dp->dp2.di_extb[j];
ret = (*idesc->id_func)(idesc);
if (ret & STOP)
break;
}
}
if (sblock.fs_magic == FS_UFS2_MAGIC)
eascan(idesc, &dp->dp2);
idesc->id_entryno *= btodb(sblock.fs_fsize);
if (DIP(dp, di_blocks) != idesc->id_entryno) {
pwarn("INCORRECT BLOCK COUNT I=%lu (%ju should be %ju)",
(u_long)inumber, (uintmax_t)DIP(dp, di_blocks),
(uintmax_t)idesc->id_entryno);
if (preen)
printf(" (CORRECTED)\n");
else if (reply("CORRECT") == 0)
return (1);
if (bkgrdflag == 0) {
ginode(inumber, &ip);
DIP_SET(ip.i_dp, di_blocks, idesc->id_entryno);
inodirty(&ip);
irelse(&ip);
} else {
cmd.value = idesc->id_number;
cmd.size = idesc->id_entryno - DIP(dp, di_blocks);
if (debug)
printf("adjblkcnt ino %ju amount %lld\n",
(uintmax_t)cmd.value, (long long)cmd.size);
if (sysctl(adjblkcnt, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST INODE BLOCK COUNT", cmd.value);
}
}
/*
* UFS does not allow files to end with a hole; it requires that
* the last block of a file be allocated. The last allocated block
* in a file is tracked in id_lballoc. Here, we check for a size
* past the last allocated block of the file and if that is found,
* shorten the file to reference the last allocated block to avoid
* having it reference a hole at its end.
*
* Soft updates will always ensure that the file size is correct
* for files that contain only direct block pointers. However
* soft updates does not roll back sizes for files with indirect
* blocks that it has set to unallocated because their contents
* have not yet been written to disk. Hence, the file can appear
* to have a hole at its end because the block pointer has been
* rolled back to zero. Thus finding a hole at the end of a file
* that is located in an indirect block receives only a warning
* while finding a hole at the end of a file in a direct block
* receives a fatal error message.
*/
size = DIP(dp, di_size);
if (idesc->id_lballoc < lblkno(&sblock, size - 1) &&
/* exclude embedded symbolic links */
((mode != IFLNK) || size >= sblock.fs_maxsymlinklen)) {
fixsize = lblktosize(&sblock, idesc->id_lballoc + 1);
if (size > UFS_NDADDR * sblock.fs_bsize)
pwarn("INODE %lu: FILE SIZE %ju BEYOND END OF "
"ALLOCATED FILE, SIZE SHOULD BE %ju",
(u_long)inumber, size, fixsize);
else
pfatal("INODE %lu: FILE SIZE %ju BEYOND END OF "
"ALLOCATED FILE, SIZE SHOULD BE %ju",
(u_long)inumber, size, fixsize);
if (preen)
printf(" (ADJUSTED)\n");
else if (reply("ADJUST") == 0)
return (1);
if (bkgrdflag == 0) {
ginode(inumber, &ip);
DIP_SET(ip.i_dp, di_size, fixsize);
inodirty(&ip);
irelse(&ip);
} else {
cmd.value = idesc->id_number;
cmd.size = fixsize;
if (debug)
printf("setsize ino %ju size set to %ju\n",
(uintmax_t)cmd.value, (uintmax_t)cmd.size);
if (sysctl(setsize, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("SET INODE SIZE", cmd.value);
}
}
return (1);
unknown:
pfatal("UNKNOWN FILE TYPE I=%lu", (u_long)inumber);
inoinfo(inumber)->ino_state = FCLEAR;
if (reply("CLEAR") == 1) {
inoinfo(inumber)->ino_state = USTATE;
ginode(inumber, &ip);
clearinode(ip.i_dp);
inodirty(&ip);
irelse(&ip);
}
return (1);
}
int
pass1check(struct inodesc *idesc)
{
int res = KEEPON;
int anyout, nfrags;
ufs2_daddr_t blkno = idesc->id_blkno;
struct dups *dlp;
struct dups *new;
if (idesc->id_type == SNAP) {
if (blkno == BLK_NOCOPY)
return (KEEPON);
if (idesc->id_number == cursnapshot) {
if (blkno == blkstofrags(&sblock, idesc->id_lbn))
return (KEEPON);
if (blkno == BLK_SNAP) {
blkno = blkstofrags(&sblock, idesc->id_lbn);
idesc->id_entryno -= idesc->id_numfrags;
}
} else {
if (blkno == BLK_SNAP)
return (KEEPON);
}
}
if ((anyout = chkrange(blkno, idesc->id_numfrags)) != 0) {
blkerror(idesc->id_number, "BAD", blkno);
if (badblk++ >= MAXBAD) {
pwarn("EXCESSIVE BAD BLKS I=%lu",
(u_long)idesc->id_number);
if (preen)
printf(" (SKIPPING)\n");
else if (reply("CONTINUE") == 0) {
ckfini(0);
exit(EEXIT);
}
rerun = 1;
return (STOP);
}
}
for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
if (anyout && chkrange(blkno, 1)) {
res = SKIP;
} else if (!testbmap(blkno)) {
n_blks++;
setbmap(blkno);
} else {
blkerror(idesc->id_number, "DUP", blkno);
if (dupblk++ >= MAXDUP) {
pwarn("EXCESSIVE DUP BLKS I=%lu",
(u_long)idesc->id_number);
if (preen)
printf(" (SKIPPING)\n");
else if (reply("CONTINUE") == 0) {
ckfini(0);
exit(EEXIT);
}
rerun = 1;
return (STOP);
}
new = (struct dups *)Malloc(sizeof(struct dups));
if (new == NULL) {
pfatal("DUP TABLE OVERFLOW.");
if (reply("CONTINUE") == 0) {
ckfini(0);
exit(EEXIT);
}
rerun = 1;
return (STOP);
}
new->dup = blkno;
if (muldup == NULL) {
duplist = muldup = new;
new->next = NULL;
} else {
new->next = muldup->next;
muldup->next = new;
}
for (dlp = duplist; dlp != muldup; dlp = dlp->next)
if (dlp->dup == blkno)
break;
if (dlp == muldup && dlp->dup != blkno)
muldup = new;
}
/*
* count the number of blocks found in id_entryno
*/
idesc->id_entryno++;
}
if (idesc->id_level == 0 && idesc->id_lballoc < idesc->id_lbn)
idesc->id_lballoc = idesc->id_lbn;
return (res);
}
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