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freebsd-dev/sbin/fsck_ffs/main.c
Kirk McKusick 460ed6106c Add support for managing UFS/FFS snapshots to fsck_ffs(8). 
The kernel handles the managment of UFS/FFS snapshots. Since UFS/FFS
updates filesystem data (rather than always writing changes to new
locations like ZFS), the kernel must check every filesystem write
to see if the block being written is part of a snapshot. If it is
part of a snapshot, then the kernel must make a copy of the old
block value into a newly allocated block for the snapshot before
allowing the write to be done. Similarly, if a block is being freed,
the kernel must check to see if it is part of a snapshot and let
the snapshot claim the block rather than freeing it for future use.
When a snapshot is freed, its blocks need to be offered to older
snapshots and freed only if no older snapshots wish to claim them.

When snapshots were added to UFS/FFS they were integrated into soft
updates and just a small part of the management of snapshots needed
to be added to fsck_ffs(8) as soft updates minimized the set of
snapshot changes that might need correction. When journaling was
added to soft updates a much more complete knowledge of snapshots
needed to be added to fsck_ffs(8) for it to be able to properly
handle the filesystem changes that a journal rollback needs to do
(specifically the freeing and allocation of blocks). Since this
functionality was unavailable, the use of snapshots was disabled
when running with journaled soft updates.

This set of changes imports the kernel code for the management of
snapshots to fsck_ffs(8). With this code in place it will become
possible to enable snapshots when running with journalled soft
updates. The most immediate benefit will be the ability to use
snapshots to take consistent filesystem dumps on live filesystems.
Future work will be done to update fsck_ffs(8) to be able to use
snapshots to run in background on live filesystems running with
journaled soft updates.

Reviewed by:  kib
Tested by:    Peter Holm
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36491
2022-11-09 10:46:31 -08:00

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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("$FreeBSD$");
#define IN_RTLD /* So we pickup the P_OSREL defines */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/disklabel.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <inttypes.h>
#include <libufs.h>
#include <mntopts.h>
#include <paths.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include "fsck.h"
static int restarts;
static void usage(void) __dead2;
static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
static int checkfilesys(char *filesys);
static int setup_bkgrdchk(struct statfs *mntp, int sbrdfailed, char **filesys);
static int chkdoreload(struct statfs *mntp);
static struct statfs *getmntpt(const char *);
int
main(int argc, char *argv[])
{
int ch;
struct rlimit rlimit;
struct itimerval itimerval;
int fsret;
int ret = 0;
sync();
skipclean = 1;
inoopt = 0;
while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) {
switch (ch) {
case 'b':
skipclean = 0;
bflag = argtoimax('b', "number", optarg, 10);
printf("Alternate super block location: %jd\n", bflag);
break;
case 'B':
bkgrdflag = 1;
break;
case 'c':
skipclean = 0;
cvtlevel = argtoimax('c', "conversion level", optarg,
10);
if (cvtlevel < 3)
errx(EEXIT, "cannot do level %d conversion",
cvtlevel);
break;
case 'd':
debug++;
break;
case 'E':
Eflag++;
break;
case 'f':
skipclean = 0;
break;
case 'F':
bkgrdcheck = 1;
break;
case 'm':
lfmode = argtoimax('m', "mode", optarg, 8);
if (lfmode &~ 07777)
errx(EEXIT, "bad mode to -m: %o", lfmode);
printf("** lost+found creation mode %o\n", lfmode);
break;
case 'n':
nflag++;
yflag = 0;
break;
case 'p':
preen++;
/*FALLTHROUGH*/
case 'C':
ckclean++;
break;
case 'R':
wantrestart = 1;
break;
case 'r':
inoopt++;
break;
case 'S':
surrender = 1;
break;
case 'y':
yflag++;
nflag = 0;
break;
case 'Z':
Zflag++;
break;
case 'z':
zflag++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (!argc)
usage();
if (bkgrdflag && cvtlevel > 0) {
pfatal("CANNOT CONVERT A SNAPSHOT\n");
exit(EEXIT);
}
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
(void)signal(SIGINT, catch);
if (ckclean)
(void)signal(SIGQUIT, catchquit);
signal(SIGINFO, infohandler);
if (bkgrdflag) {
signal(SIGALRM, alarmhandler);
itimerval.it_interval.tv_sec = 5;
itimerval.it_interval.tv_usec = 0;
itimerval.it_value.tv_sec = 5;
itimerval.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &itimerval, NULL);
}
/*
* Push up our allowed memory limit so we can cope
* with huge file systems.
*/
if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
rlimit.rlim_cur = rlimit.rlim_max;
(void)setrlimit(RLIMIT_DATA, &rlimit);
}
while (argc > 0) {
if ((fsret = checkfilesys(*argv)) == ERESTART)
continue;
ret |= fsret;
argc--;
argv++;
}
if (returntosingle)
ret = 2;
exit(ret);
}
static intmax_t
argtoimax(int flag, const char *req, const char *str, int base)
{
char *cp;
intmax_t ret;
ret = strtoimax(str, &cp, base);
if (cp == str || *cp)
errx(EEXIT, "-%c flag requires a %s", flag, req);
return (ret);
}
/*
* Check the specified file system.
*/
/* ARGSUSED */
static int
checkfilesys(char *filesys)
{
ufs2_daddr_t n_ffree, n_bfree;
struct dups *dp;
struct statfs *mntp;
intmax_t blks, files;
size_t size;
int sbreadfailed, ofsmodified;
fsutilinit();
fsckinit();
cdevname = filesys;
if (debug && ckclean)
pwarn("starting\n");
/*
* Make best effort to get the disk name. Check first to see
* if it is listed among the mounted file systems. Failing that
* check to see if it is listed in /etc/fstab.
*/
mntp = getmntpt(filesys);
if (mntp != NULL)
filesys = mntp->f_mntfromname;
else
filesys = blockcheck(filesys);
/*
* If -F flag specified, check to see whether a background check
* is possible and needed. If possible and needed, exit with
* status zero. Otherwise exit with status non-zero. A non-zero
* exit status will cause a foreground check to be run.
*/
sblock_init();
sbreadfailed = 0;
if (openfilesys(filesys) == 0 || readsb() == 0)
sbreadfailed = 1;
if (bkgrdcheck) {
if (sbreadfailed)
exit(3); /* Cannot read superblock */
/* Earlier background failed or journaled */
if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
exit(4);
if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
exit(5); /* Not running soft updates */
size = MIBSIZE;
if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
exit(6); /* Lacks kernel support */
if ((mntp == NULL && sblock.fs_clean == 1) ||
(mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
exit(7); /* Filesystem clean, report it now */
exit(0);
}
if (ckclean && skipclean) {
/*
* If file system is gjournaled, check it here.
*/
if (sbreadfailed)
exit(3); /* Cannot read superblock */
if (bkgrdflag == 0 &&
(nflag || (fswritefd = open(filesys, O_WRONLY)) < 0)) {
fswritefd = -1;
if (preen)
pfatal("NO WRITE ACCESS");
printf(" (NO WRITE)");
}
if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
if (sblock.fs_clean == 1) {
pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
exit(0);
}
if ((sblock.fs_flags &
(FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
bufinit();
gjournal_check(filesys);
if (chkdoreload(mntp) == 0)
exit(0);
exit(4);
} else {
pfatal("FULL FSCK NEEDED, CANNOT RUN FAST "
"FSCK\n");
}
}
close(fswritefd);
fswritefd = -1;
}
if (bkgrdflag) {
switch (setup_bkgrdchk(mntp, sbreadfailed, &filesys)) {
case -1: /* filesystem clean */
goto clean;
case 0: /* cannot do background, give up */
exit(EEXIT);
case 1: /* doing background check, preen rules apply */
preen = 1;
break;
}
}
switch (setup(filesys)) {
case 0:
if (preen)
pfatal("CAN'T CHECK FILE SYSTEM.");
return (EEXIT);
case -1:
clean:
pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
(intmax_t)sblock.fs_cstotal.cs_nffree,
(intmax_t)sblock.fs_cstotal.cs_nbfree,
sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
return (0);
}
/*
* Determine if we can and should do journal recovery.
*/
if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
sujrecovery = 1;
if (suj_check(filesys) == 0) {
printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
if (chkdoreload(mntp) == 0)
exit(0);
exit(4);
}
sujrecovery = 0;
printf("** Skipping journal, falling through to full fsck\n\n");
}
if (fswritefd != -1) {
/*
* Write the superblock so we don't try to recover the
* journal on another pass. If this is the only change
* to the filesystem, we do not want it to be called
* out as modified.
*/
sblock.fs_mtime = time(NULL);
sbdirty();
ofsmodified = fsmodified;
flush(fswritefd, &sblk);
fsmodified = ofsmodified;
}
}
/*
* If the filesystem was run on an old kernel that did not
* support check hashes, clear the check-hash flags so that
* we do not try to verify them.
*/
if ((sblock.fs_flags & FS_METACKHASH) == 0)
sblock.fs_metackhash = 0;
/*
* If we are running on a kernel that can provide check hashes
* that are not yet enabled for the filesystem and we are
* running manually without the -y flag, offer to add any
* supported check hashes that are not already enabled.
*/
ckhashadd = 0;
if (preen == 0 && yflag == 0 && sblock.fs_magic != FS_UFS1_MAGIC &&
fswritefd != -1 && getosreldate() >= P_OSREL_CK_CYLGRP) {
if ((sblock.fs_metackhash & CK_CYLGRP) == 0 &&
reply("ADD CYLINDER GROUP CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_CYLGRP;
sblock.fs_metackhash |= CK_CYLGRP;
}
if ((sblock.fs_metackhash & CK_SUPERBLOCK) == 0 &&
getosreldate() >= P_OSREL_CK_SUPERBLOCK &&
reply("ADD SUPERBLOCK CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_SUPERBLOCK;
sblock.fs_metackhash |= CK_SUPERBLOCK;
}
if ((sblock.fs_metackhash & CK_INODE) == 0 &&
getosreldate() >= P_OSREL_CK_INODE &&
reply("ADD INODE CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_INODE;
sblock.fs_metackhash |= CK_INODE;
}
#ifdef notyet
if ((sblock.fs_metackhash & CK_INDIR) == 0 &&
getosreldate() >= P_OSREL_CK_INDIR &&
reply("ADD INDIRECT BLOCK CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_INDIR;
sblock.fs_metackhash |= CK_INDIR;
}
if ((sblock.fs_metackhash & CK_DIR) == 0 &&
getosreldate() >= P_OSREL_CK_DIR &&
reply("ADD DIRECTORY CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_DIR;
sblock.fs_metackhash |= CK_DIR;
}
#endif /* notyet */
if (ckhashadd != 0) {
sblock.fs_flags |= FS_METACKHASH;
sbdirty();
}
}
/*
* Cleared if any questions answered no. Used to decide if
* the superblock should be marked clean.
*/
resolved = 1;
/*
* 1: scan inodes tallying blocks used
*/
if (preen == 0) {
printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
printf("** Root file system\n");
printf("** Phase 1 - Check Blocks and Sizes\n");
}
clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
pass1();
IOstats("Pass1");
/*
* 1b: locate first references to duplicates, if any
*/
if (duplist) {
if (preen || usedsoftdep)
pfatal("INTERNAL ERROR: DUPS WITH %s%s%s",
preen ? "-p" : "",
(preen && usedsoftdep) ? " AND " : "",
usedsoftdep ? "SOFTUPDATES" : "");
printf("** Phase 1b - Rescan For More DUPS\n");
pass1b();
IOstats("Pass1b");
}
/*
* 2: traverse directories from root to mark all connected directories
*/
if (preen == 0)
printf("** Phase 2 - Check Pathnames\n");
pass2();
IOstats("Pass2");
/*
* 3: scan inodes looking for disconnected directories
*/
if (preen == 0)
printf("** Phase 3 - Check Connectivity\n");
pass3();
IOstats("Pass3");
/*
* 4: scan inodes looking for disconnected files; check reference counts
*/
if (preen == 0)
printf("** Phase 4 - Check Reference Counts\n");
pass4();
IOstats("Pass4");
/*
* 5: check and repair resource counts in cylinder groups
*/
if (preen == 0)
printf("** Phase 5 - Check Cyl groups\n");
snapflush(std_checkblkavail);
pass5();
IOstats("Pass5");
/*
* print out summary statistics
*/
n_ffree = sblock.fs_cstotal.cs_nffree;
n_bfree = sblock.fs_cstotal.cs_nbfree;
files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
blks = n_blks +
sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
if (bkgrdflag && (files > 0 || blks > 0)) {
countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
countdirs, files - countdirs, blks);
}
pwarn("%ld files, %jd used, %ju free ",
(long)n_files, (intmax_t)n_blks,
(uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
(uintmax_t)n_ffree, (uintmax_t)n_bfree,
n_ffree * 100.0 / sblock.fs_dsize);
if (debug) {
if (files < 0)
printf("%jd inodes missing\n", -files);
if (blks < 0)
printf("%jd blocks missing\n", -blks);
if (duplist != NULL) {
printf("The following duplicate blocks remain:");
for (dp = duplist; dp; dp = dp->next)
printf(" %jd,", (intmax_t)dp->dup);
printf("\n");
}
}
duplist = (struct dups *)0;
muldup = (struct dups *)0;
inocleanup();
if (fsmodified) {
sblock.fs_time = time(NULL);
sbdirty();
}
if (cvtlevel && (sblk.b_flags & B_DIRTY) != 0) {
/*
* Write out the duplicate super blocks
*/
if (sbput(fswritefd, &sblock, sblock.fs_ncg) == 0)
fsmodified = 1;
}
if (rerun)
resolved = 0;
/*
* Check to see if the file system is mounted read-write.
*/
if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
resolved = 0;
ckfini(resolved);
if (fsmodified && !preen)
printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
if (rerun) {
if (wantrestart && (restarts++ < 10) &&
(preen || reply("RESTART")))
return (ERESTART);
printf("\n***** PLEASE RERUN FSCK *****\n");
}
if (chkdoreload(mntp) != 0) {
if (!fsmodified)
return (0);
if (!preen)
printf("\n***** REBOOT NOW *****\n");
sync();
return (4);
}
return (rerun ? ERERUN : 0);
}
/*
* If we are to do a background check:
* Get the mount point information of the file system
* If already clean, return -1
* Check that kernel supports background fsck
* Find or create the snapshot directory
* Create the snapshot file
* Open snapshot
* If anything fails print reason and return 0 which exits
*/
static int
setup_bkgrdchk(struct statfs *mntp, int sbreadfailed, char **filesys)
{
struct stat snapdir;
struct group *grp;
struct iovec *iov;
char errmsg[255];
int iovlen;
size_t size;
/* Get the mount point information of the file system */
if (mntp == NULL) {
pwarn("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if ((mntp->f_flags & MNT_RDONLY) != 0) {
pwarn("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
pwarn("NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if (sbreadfailed) {
pwarn("SUPERBLOCK READ FAILED, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if ((sblock.fs_flags & FS_NEEDSFSCK) != 0) {
pwarn("FULL FSCK NEEDED, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if ((sblock.fs_flags & FS_SUJ) != 0) {
pwarn("JOURNALED FILESYSTEM, CANNOT RUN IN BACKGROUND\n");
return (0);
}
if (skipclean && ckclean &&
(sblock.fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK)) == 0) {
/*
* file system is clean;
* skip snapshot and report it clean
*/
pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
return (-1);
}
/* Check that kernel supports background fsck */
size = MIBSIZE;
if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
sysctlnametomib("vfs.ffs.setsize", setsize, &size) < 0 ||
sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
pwarn("KERNEL LACKS BACKGROUND FSCK SUPPORT\n");
return (0);
}
/*
* When kernel lacks runtime bgfsck superblock summary
* adjustment functionality, it does not mean we can not
* continue, as old kernels will recompute the summary at
* mount time. However, it will be an unexpected softupdates
* inconsistency if it turns out that the summary is still
* incorrect. Set a flag so subsequent operation can know this.
*/
bkgrdsumadj = 1;
if (sysctlnametomib("vfs.ffs.adjndir", adjndir, &size) < 0 ||
sysctlnametomib("vfs.ffs.adjnbfree", adjnbfree, &size) < 0 ||
sysctlnametomib("vfs.ffs.adjnifree", adjnifree, &size) < 0 ||
sysctlnametomib("vfs.ffs.adjnffree", adjnffree, &size) < 0 ||
sysctlnametomib("vfs.ffs.adjnumclusters", adjnumclusters,
&size) < 0) {
bkgrdsumadj = 0;
pwarn("KERNEL LACKS RUNTIME SUPERBLOCK SUMMARY ADJUSTMENT "
"SUPPORT\n");
}
/* Find or create the snapshot directory */
snprintf(snapname, sizeof snapname, "%s/.snap",
mntp->f_mntonname);
if (stat(snapname, &snapdir) < 0) {
if (errno != ENOENT) {
pwarn("CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT "
"RUN IN BACKGROUND\n", snapname, strerror(errno));
return (0);
}
if ((grp = getgrnam("operator")) == NULL ||
mkdir(snapname, 0770) < 0 ||
chown(snapname, -1, grp->gr_gid) < 0 ||
chmod(snapname, 0770) < 0) {
pwarn("CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, "
"CANNOT RUN IN BACKGROUND\n", snapname,
strerror(errno));
return (0);
}
} else if (!S_ISDIR(snapdir.st_mode)) {
pwarn("%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
snapname);
return (0);
}
/* Create the snapshot file */
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
snprintf(snapname, sizeof snapname, "%s/.snap/fsck_snapshot",
mntp->f_mntonname);
build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
build_iovec(&iov, &iovlen, "from", snapname, (size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname, (size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
/* Create snapshot, removing old snapshot if it exists */
while (nmount(iov, iovlen, mntp->f_flags) < 0) {
if (errno == EEXIST && unlink(snapname) == 0)
continue;
pwarn("CANNOT CREATE SNAPSHOT %s: %s %s\n", snapname,
strerror(errno), errmsg);
return (0);
}
/* Open snapshot */
if (openfilesys(snapname) == 0) {
unlink(snapname);
pwarn("CANNOT OPEN SNAPSHOT %s: %s, CANNOT RUN IN "
"BACKGROUND\n", snapname, strerror(errno));
return (0);
}
free(sblock.fs_csp);
free(sblock.fs_si);
havesb = 0;
*filesys = snapname;
cmd.version = FFS_CMD_VERSION;
cmd.handle = fsreadfd;
return (1);
}
static int
chkdoreload(struct statfs *mntp)
{
struct iovec *iov;
int iovlen;
char errmsg[255];
if (mntp == NULL)
return (0);
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
/*
* We modified a mounted file system. Do a mount update on
* it unless it is read-write, so we can continue using it
* as safely as possible.
*/
if (mntp->f_flags & MNT_RDONLY) {
build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
(size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->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);
/*
* XX: We need the following line until we clean up
* nmount parsing of root mounts and NFS root mounts.
*/
build_iovec(&iov, &iovlen, "ro", NULL, 0);
if (nmount(iov, iovlen, mntp->f_flags) == 0) {
return (0);
}
pwarn("mount reload of '%s' failed: %s %s\n\n",
mntp->f_mntonname, strerror(errno), errmsg);
return (1);
}
return (0);
}
/*
* Get the mount point information for name.
*/
static struct statfs *
getmntpt(const char *name)
{
struct stat devstat, mntdevstat;
char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
char *ddevname;
struct statfs *mntbuf, *statfsp;
int i, mntsize, isdev;
if (stat(name, &devstat) != 0)
return (NULL);
if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
isdev = 1;
else
isdev = 0;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
ddevname = statfsp->f_mntfromname;
if (*ddevname != '/') {
if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
sizeof(statfsp->f_mntfromname))
continue;
strcpy(device, _PATH_DEV);
strcat(device, ddevname);
strcpy(statfsp->f_mntfromname, device);
}
if (isdev == 0) {
if (strcmp(name, statfsp->f_mntonname))
continue;
return (statfsp);
}
if (stat(ddevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
statfsp = NULL;
return (statfsp);
}
static void
usage(void)
{
(void) fprintf(stderr,
"usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
getprogname());
exit(1);
}
void
infohandler(int sig __unused)
{
got_siginfo = 1;
}
void
alarmhandler(int sig __unused)
{
got_sigalarm = 1;
}
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