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freebsd-skq/sbin/fsck_ffs/globs.c
Kirk McKusick ac4b20a0a7 After a crash, a file that extends into indirect blocks may end up 
shorter than its size resulting in a hole as its final block (which
is a violation of the invarients of the UFS filesystem).

Soft updates will always ensure that the file size is correct when
writing inodes to disk 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 when its inode was written to disk. Thus,
fsck_ffs calculates the last allocated block in the file. For files
that extend into indirect blocks, fsck_ffs checks for a size past
the last allocated block of the file and if that is found, shortens
the file to reference the last allocated block thus avoiding having
it reference a hole at its end.

Submitted by: Chuck Silvers <chs@netflix.com>
Tested by:    Chuck Silvers <chs@netflix.com>
MFC after:    1 week
Sponsored by: Netflix
2019-02-25 21:58:19 +00:00

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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 copyright[] =
"@(#) Copyright (c) 1980, 1986, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/14/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <string.h>
#include "fsck.h"
long readcnt[BT_NUMBUFTYPES];
long totalreadcnt[BT_NUMBUFTYPES];
struct timespec readtime[BT_NUMBUFTYPES];
struct timespec totalreadtime[BT_NUMBUFTYPES];
struct timespec startprog;
struct bufarea sblk; /* file system superblock */
struct bufarea *pdirbp; /* current directory contents */
struct bufarea *pbp; /* current inode block */
ino_t cursnapshot;
long dirhash, inplast;
unsigned long numdirs, listmax;
long countdirs; /* number of directories we actually found */
int adjrefcnt[MIBSIZE]; /* MIB command to adjust inode reference cnt */
int adjblkcnt[MIBSIZE]; /* MIB command to adjust inode block count */
int setsize[MIBSIZE]; /* MIB command to set inode size */
int adjndir[MIBSIZE]; /* MIB command to adjust number of directories */
int adjnbfree[MIBSIZE]; /* MIB command to adjust number of free blocks */
int adjnifree[MIBSIZE]; /* MIB command to adjust number of free inodes */
int adjnffree[MIBSIZE]; /* MIB command to adjust number of free frags */
int adjnumclusters[MIBSIZE]; /* MIB command to adjust number of free clusters */
int freefiles[MIBSIZE]; /* MIB command to free a set of files */
int freedirs[MIBSIZE]; /* MIB command to free a set of directories */
int freeblks[MIBSIZE]; /* MIB command to free a set of data blocks */
struct fsck_cmd cmd; /* sysctl file system update commands */
char snapname[BUFSIZ]; /* when doing snapshots, the name of the file */
char *cdevname; /* name of device being checked */
long dev_bsize; /* computed value of DEV_BSIZE */
long secsize; /* actual disk sector size */
u_int real_dev_bsize; /* actual disk sector size, not overridden */
char nflag; /* assume a no response */
char yflag; /* assume a yes response */
int bkgrdflag; /* use a snapshot to run on an active system */
off_t bflag; /* location of alternate super block */
int debug; /* output debugging info */
int Eflag; /* delete empty data blocks */
int Zflag; /* zero empty data blocks */
int inoopt; /* trim out unused inodes */
char ckclean; /* only do work if not cleanly unmounted */
int cvtlevel; /* convert to newer file system format */
int ckhashadd; /* check hashes to be added */
int bkgrdcheck; /* determine if background check is possible */
int bkgrdsumadj; /* whether the kernel have ability to adjust superblock summary */
char usedsoftdep; /* just fix soft dependency inconsistencies */
char preen; /* just fix normal inconsistencies */
char rerun; /* rerun fsck. Only used in non-preen mode */
int returntosingle; /* 1 => return to single user mode on exit */
char resolved; /* cleared if unresolved changes => not clean */
char havesb; /* superblock has been read */
char skipclean; /* skip clean file systems if preening */
int fsmodified; /* 1 => write done to file system */
int fsreadfd; /* file descriptor for reading file system */
int fswritefd; /* file descriptor for writing file system */
int surrender; /* Give up if reads fail */
int wantrestart; /* Restart fsck on early termination */
ufs2_daddr_t maxfsblock; /* number of blocks in the file system */
char *blockmap; /* ptr to primary blk allocation map */
ino_t maxino; /* number of inodes in file system */
ino_t lfdir; /* lost & found directory inode number */
const char *lfname; /* lost & found directory name */
int lfmode; /* lost & found directory creation mode */
ufs2_daddr_t n_blks; /* number of blocks in use */
ino_t n_files; /* number of files in use */
volatile sig_atomic_t got_siginfo; /* received a SIGINFO */
volatile sig_atomic_t got_sigalarm; /* received a SIGALRM */
struct ufs1_dinode ufs1_zino;
struct ufs2_dinode ufs2_zino;
void
fsckinit(void)
{
bzero(readcnt, sizeof(long) * BT_NUMBUFTYPES);
bzero(totalreadcnt, sizeof(long) * BT_NUMBUFTYPES);
bzero(readtime, sizeof(struct timespec) * BT_NUMBUFTYPES);
bzero(totalreadtime, sizeof(struct timespec) * BT_NUMBUFTYPES);
bzero(&startprog, sizeof(struct timespec));
bzero(&sblk, sizeof(struct bufarea));
pdirbp = NULL;
pbp = NULL;
cursnapshot = 0;
listmax = numdirs = dirhash = inplast = 0;
countdirs = 0;
bzero(adjrefcnt, sizeof(int) * MIBSIZE);
bzero(adjblkcnt, sizeof(int) * MIBSIZE);
bzero(setsize, sizeof(int) * MIBSIZE);
bzero(adjndir, sizeof(int) * MIBSIZE);
bzero(adjnbfree, sizeof(int) * MIBSIZE);
bzero(adjnifree, sizeof(int) * MIBSIZE);
bzero(adjnffree, sizeof(int) * MIBSIZE);
bzero(adjnumclusters, sizeof(int) * MIBSIZE);
bzero(freefiles, sizeof(int) * MIBSIZE);
bzero(freedirs, sizeof(int) * MIBSIZE);
bzero(freeblks, sizeof(int) * MIBSIZE);
bzero(&cmd, sizeof(struct fsck_cmd));
bzero(snapname, sizeof(char) * BUFSIZ);
cdevname = NULL;
dev_bsize = 0;
secsize = 0;
real_dev_bsize = 0;
bkgrdsumadj = 0;
usedsoftdep = 0;
rerun = 0;
returntosingle = 0;
resolved = 0;
havesb = 0;
fsmodified = 0;
fsreadfd = 0;
fswritefd = 0;
maxfsblock = 0;
blockmap = NULL;
maxino = 0;
lfdir = 0;
lfname = "lost+found";
lfmode = 0700;
n_blks = 0;
n_files = 0;
got_siginfo = 0;
got_sigalarm = 0;
bzero(&ufs1_zino, sizeof(struct ufs1_dinode));
bzero(&ufs2_zino, sizeof(struct ufs2_dinode));
}
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