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Add the `L' option to dump to notify it that it is dumping a
live filesystem. To obtain a consistent dump image, dump takes a snapshot of the filesystem and then does a dump of the snapshot. The snapshot is removed when the dump is complete. Also add an operator warning that the `L' option should be used if dump is run on a live filesystem without the `L' option being specified. The alternative would be to silently use a snapshot any time that a live filesystem is dumped, but this change in dump semantics seemed too drastic at this time. Sponsored by: DARPA & NAI Labs. Approved by: re
This commit is contained in:
Kirk McKusick
parent
0cb652d925
commit
194a666749
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=107559
@ -42,7 +42,7 @@
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.Nd file system backup
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.Sh SYNOPSIS
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.Nm
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.Op Fl 0123456789acknSu
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.Op Fl 0123456789ackLnSu
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.Op Fl B Ar records
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.Op Fl b Ar blocksize
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.Op Fl D Ar dumpdates
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@ -194,6 +194,15 @@ Use Kerberos authentication to talk to remote tape servers. (Only
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available if this option was enabled when
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.Nm
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was compiled.)
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.It Fl L
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This option is to notify
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.Nm
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that it is dumping a live filesystem.
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To obtain a consistent dump image,
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.Nm
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takes a snapshot of the filesystem and
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then does a dump of the snapshot.
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The snapshot is removed when the dump is complete.
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.It Fl n
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Whenever
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.Nm
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@ -48,15 +48,18 @@ static const char rcsid[] =
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/mount.h>
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#include <sys/disklabel.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ffs/fs.h>
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#include <protocols/dumprestore.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fstab.h>
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#include <inttypes.h>
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@ -72,6 +75,7 @@ static const char rcsid[] =
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#include "pathnames.h"
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int notify = 0; /* notify operator flag */
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int snapdump = 0; /* dumping live filesystem, so use snapshot */
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int blockswritten = 0; /* number of blocks written on current tape */
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int tapeno = 0; /* current tape number */
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int density = 0; /* density in bytes/0.1" " <- this is for hilit19 */
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@ -87,6 +91,7 @@ char *host = NULL; /* remote host (if any) */
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*/
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static int sblock_try[] = SBLOCKSEARCH;
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static char *getmntpt(char *, int *);
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static long numarg(const char *, long, long);
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static void obsolete(int *, char **[]);
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static void usage(void) __dead2;
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@ -98,9 +103,9 @@ main(int argc, char *argv[])
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ino_t ino;
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int dirty;
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union dinode *dp;
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struct fstab *dt;
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char *map;
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int ch, mode;
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struct fstab *dt;
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char *map, *mntpt;
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int ch, mode, mntflags;
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int i, anydirskipped, bflag = 0, Tflag = 0, honorlevel = 1;
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int just_estimate = 0;
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ino_t maxino;
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@ -122,9 +127,9 @@ main(int argc, char *argv[])
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obsolete(&argc, &argv);
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#ifdef KERBEROS
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#define optstring "0123456789aB:b:cd:f:h:kns:ST:uWwD:"
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#define optstring "0123456789aB:b:cd:f:h:kLns:ST:uWwD:"
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#else
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#define optstring "0123456789aB:b:cd:f:h:ns:ST:uWwD:"
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#define optstring "0123456789aB:b:cd:f:h:Lns:ST:uWwD:"
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#endif
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while ((ch = getopt(argc, argv, optstring)) != -1)
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#undef optstring
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@ -177,6 +182,10 @@ main(int argc, char *argv[])
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break;
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#endif
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case 'L':
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snapdump = 1;
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break;
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case 'n': /* notify operators */
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notify = 1;
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break;
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@ -309,12 +318,53 @@ main(int argc, char *argv[])
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}
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spcl.c_dev[NAMELEN-1]='\0';
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spcl.c_filesys[NAMELEN-1]='\0';
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if ((mntpt = getmntpt(disk, &mntflags)) != 0) {
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if (snapdump == 0) {
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msg("WARNING: %s\n",
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"should use -L when dumping live filesystems!");
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} else {
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struct ufs_args args;
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char snapname[BUFSIZ];
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snprintf(snapname, sizeof snapname, "%s/.dump_snapshot",
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mntpt);
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args.fspec = snapname;
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while (mount("ffs", mntpt,
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mntflags | MNT_UPDATE | MNT_SNAPSHOT,
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&args) < 0) {
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if (errno == EEXIST && unlink(snapname) == 0)
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continue;
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errx(X_STARTUP, "Cannot create %s: %s\n",
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snapname, strerror(errno));
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}
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if ((diskfd = open(snapname, O_RDONLY)) < 0) {
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unlink(snapname);
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errx(X_STARTUP, "Cannot open %s: %s\n",
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snapname, strerror(errno));
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}
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unlink(snapname);
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if (fstat(diskfd, &sb) != 0)
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err(X_STARTUP, "%s: stat", snapname);
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spcl.c_date = _time_to_time64(sb.st_mtime);
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}
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} else if (snapdump != 0) {
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msg("WARNING: Cannot use -L on an unmounted filesystem.\n");
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snapdump = 0;
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}
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if (snapdump == 0) {
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if ((diskfd = open(disk, O_RDONLY)) < 0)
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err(X_STARTUP, "Cannot open %s", disk);
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if (fstat(diskfd, &sb) != 0)
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err(X_STARTUP, "%s: stat", disk);
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if (S_ISDIR(sb.st_mode))
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errx(X_STARTUP, "%s: unknown file system", disk);
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}
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(void)strcpy(spcl.c_label, "none");
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(void)gethostname(spcl.c_host, NAMELEN);
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spcl.c_level = level - '0';
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spcl.c_type = TS_TAPE;
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if (!Tflag)
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getdumptime(); /* /etc/dumpdates snarfed */
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if (spcl.c_date == 0) {
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tmsg = "the epoch\n";
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@ -323,6 +373,9 @@ main(int argc, char *argv[])
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tmsg = ctime(&t);
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}
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msg("Date of this level %c dump: %s", level, tmsg);
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if (!Tflag)
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getdumptime(); /* /etc/dumpdates snarfed */
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if (spcl.c_ddate == 0) {
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tmsg = "the epoch\n";
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} else {
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@ -330,7 +383,8 @@ main(int argc, char *argv[])
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tmsg = ctime(&t);
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}
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msg("Date of last level %c dump: %s", lastlevel, tmsg);
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msg("Dumping %s ", disk);
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msg("Dumping %s%s ", snapdump ? "snapshot of ": "", disk);
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if (dt != NULL)
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msgtail("(%s) ", dt->fs_file);
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if (host)
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@ -338,12 +392,6 @@ main(int argc, char *argv[])
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else
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msgtail("to %s\n", tape);
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if ((diskfd = open(disk, O_RDONLY)) < 0)
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err(X_STARTUP, "Cannot open %s", disk);
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if (fstat(diskfd, &sb) != 0)
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err(X_STARTUP, "%s: stat", disk);
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if (S_ISDIR(sb.st_mode))
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errx(X_STARTUP, "%s: unknown file system", disk);
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sync();
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sblock = (struct fs *)sblock_buf;
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for (i = 0; sblock_try[i] != -1; i++) {
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@ -530,6 +578,25 @@ usage(void)
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exit(X_STARTUP);
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}
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/*
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* Check to see if a disk is currently mounted.
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*/
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static char *
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getmntpt(char *name, int *mntflagsp)
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{
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long mntsize, i;
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struct statfs *mntbuf;
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mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
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for (i = 0; i < mntsize; i++) {
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if (!strcmp(mntbuf[i].f_mntfromname, name)) {
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*mntflagsp = mntbuf[i].f_flags;
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return (mntbuf[i].f_mntonname);
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}
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}
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return (0);
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}
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/*
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* Pick up a numeric argument. It must be nonnegative and in the given
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* range (except that a vmax of 0 means unlimited).
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