2 * Ported to Linux's Second Extended File System as part of the
3 * dump and restore backup suit
4 * Remy Card <card@Linux.EU.Org>, 1994-1997
5 * Stelian Pop <stelian@popies.net>, 1999-2000
6 * Stelian Pop <stelian@popies.net> - AlcĂ´ve <www.alcove.com>, 2000-2002
10 * Copyright (c) 1980, 1991, 1993
11 * The Regents of the University of California. All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 static const char rcsid
[] =
40 "$Id: tape.c,v 1.93 2011/05/20 09:52:19 stelian Exp $";
44 #include <compatlfs.h>
50 #include <compaterr.h>
61 #include <sys/types.h>
63 #include <sys/ioctl.h>
64 #include <sys/mount.h> /* for definition of BLKFLSBUF */
65 #ifndef BLKFLSBUF /* last resort... */
66 #define BLKFLSBUF _IO(0x12, 97) /* Flush buffer cache. */
70 #include <sys/param.h>
71 #include <sys/socket.h>
75 #ifdef HAVE_EXT2FS_EXT2_FS_H
76 #include <ext2fs/ext2_fs.h>
78 #include <linux/ext2_fs.h>
80 #include <ext2fs/ext2fs.h>
82 #include <bsdcompat.h>
84 #include <sys/vnode.h>
87 #include <ufs/inode.h>
89 #include <ufs/ufs/dinode.h>
90 #include <ufs/ffs/fs.h>
91 #endif /* __linux__ */
93 #include <protocols/dumprestore.h>
97 #endif /* HAVE_ZLIB */
101 #endif /* HAVE_BZLIB */
105 #endif /* HAVE_LZO */
109 int writesize
; /* size of malloc()ed buffer for tape */
110 long lastspclrec
= -1; /* tape block number of last written header */
111 int trecno
= 0; /* next record to write in current block */
112 extern long *blocksperfiles
; /* number of blocks per output file(s) */
113 long blocksperfiles_current
; /* current position in blocksperfiles */
114 long blocksthisvol
; /* number of blocks on current output file */
115 extern int ntrec
; /* blocking factor on tape */
116 extern int cartridge
;
120 long long tapea_bytes
= 0; /* bytes_written at start of current volume */
121 static int magtapeout
; /* output is really a tape */
123 static ssize_t dump_atomic_read
__P((int, char *, size_t));
124 static ssize_t dump_atomic_write
__P((int, const char *, size_t));
126 static void doslave
__P((int, int, int));
128 static void doslave
__P((int, int));
130 static void enslave
__P((void));
131 static void flushtape
__P((void));
132 static void killall
__P((void));
133 static void rollforward
__P((void));
135 static int GetTapePos
__P((long long *));
136 static int MkTapeString
__P((struct s_spcl
*, long long));
137 #define FILESQFAPOS 20
141 * Concurrent dump mods (Caltech) - disk block reading and tape writing
142 * are exported to several slave processes. While one slave writes the
143 * tape, the others read disk blocks; they pass control of the tape in
144 * a ring via signals. The parent process traverses the filesystem and
145 * sends writeheader()'s and lists of daddr's to the slaves via pipes.
146 * The following structure defines the instruction packets sent to slaves.
154 struct slave_results
{
155 ssize_t unclen
; /* uncompressed length */
156 ssize_t clen
; /* compressed length */
159 #define SLAVES 3 /* 1 slave writing, 1 reading, 1 for slack */
161 int tapea
; /* header number at start of this chunk */
162 int count
; /* count to next header (used for TS_TAPE */
164 int inode
; /* inode that we are currently dealing with */
165 int fd
; /* FD for this slave */
166 int pid
; /* PID for this slave */
167 int sent
; /* 1 == we've sent this slave requests */
168 int firstrec
; /* record number of this block */
169 char (*tblock
)[TP_BSIZE
]; /* buffer for data blocks */
170 struct req
*req
; /* buffer for requests */
174 char (*nextblock
)[TP_BSIZE
];
176 static time_t tstart_volume
; /* time of volume start */
177 static int tapea_volume
; /* value of spcl.c_tapea at volume start */
179 int master
; /* pid of master, for sending error signals */
180 int tenths
; /* length of tape overhead per block written */
181 static int caught
; /* have we caught the signal to proceed? */
182 static int ready
; /* have we reached the lock point without having */
183 /* received the SIGUSR2 signal from the prev slave? */
184 static sigjmp_buf jmpbuf
; /* where to jump to if we are ready when the */
185 /* SIGUSR2 arrives from the previous slave */
187 static int gtperr
= 0;
191 * Determine if we can use Linux' clone system call. If so, call it
192 * with the CLONE_IO flag so that all processes will share the same I/O
193 * context, allowing the I/O schedulers to make better scheduling decisions.
196 /* first, pull in the header files that define sys_clone and CLONE_IO */
203 /* If either is not present, fall back on the fork behaviour */
204 #if ! defined(SYS_clone) || ! defined (CLONE_IO)
205 #define fork_clone_io fork
206 #else /* SYS_clone */
207 /* CLONE_IO is available, determine which version of sys_clone to use */
208 #include <linux/version.h>
210 * Kernel 2.5.49 introduced two extra parameters to the clone system call.
211 * Neither is useful in our case, so this is easy to handle.
213 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,49)
215 * Parameters of the sys_clone syscall are
216 * clone_flags, child_stack, parent_tidptr, child_tidptr
217 * on all architectures except s390 and s390x
218 * s390* have child_stack, clone_flags, parent_tidptr, child_tidptr
220 #if defined(__s390__) || defined(__s390x__)
221 #define CLONE_ARGS 0, SIGCHLD|CLONE_IO, NULL, NULL
223 #define CLONE_ARGS SIGCHLD|CLONE_IO, 0, NULL, NULL
226 #define CLONE_ARGS SIGCHLD|CLONE_IO, 0
227 #endif /* LINUX_VERSION_CODE */
228 pid_t
fork_clone_io(void);
229 #endif /* SYS_clone */
230 #else /* __linux__ not defined */
231 #define fork_clone_io fork
232 #endif /* __linux__ */
237 int pgoff
= getpagesize() - 1;
241 writesize
= ntrec
* TP_BSIZE
;
242 reqsiz
= (ntrec
+ 1) * sizeof(struct req
);
244 * CDC 92181's and 92185's make 0.8" gaps in 1600-bpi start/stop mode
245 * (see DEC TU80 User's Guide). The shorter gaps of 6250-bpi require
246 * repositioning after stopping, i.e, streaming mode, where the gap is
247 * variable, 0.30" to 0.45". The gap is maximal when the tape stops.
249 if (!blocksperfiles
&& !unlimited
)
250 tenths
= (cartridge
? 16 : density
== 625 ? 5 : 8);
256 * Allocate tape buffer contiguous with the array of instruction
257 * packets, so flushtape() can write them together with one write().
258 * Align tape buffer on page boundary to speed up tape write().
260 for (i
= 0; i
<= SLAVES
; i
++) {
262 malloc((unsigned)(reqsiz
+ writesize
+ pgoff
+ TP_BSIZE
));
265 slaves
[i
].tblock
= (char (*)[TP_BSIZE
])
267 (((long)&buf
[reqsiz
] + pgoff
) &~ pgoff
);
269 (((long)&buf
[ntrec
+ 1] + pgoff
) &~ pgoff
);
271 slaves
[i
].req
= (struct req
*)slaves
[i
].tblock
- ntrec
- 1;
277 nextblock
= slp
->tblock
;
282 writerec(const void *dp
, int isspcl
)
285 slp
->req
[trecno
].dblk
= (ext2_loff_t
)0;
286 slp
->req
[trecno
].count
= 1;
287 /* XXX post increment triggers an egcs-1.1.2-12 bug on alpha/sparc */
288 *(union u_spcl
*)(*(nextblock
)) = *(union u_spcl
*)dp
;
290 /* Need to write it to the archive file */
291 if (! AfileActive
&& isspcl
&& (spcl
.c_type
== TS_END
))
293 if (AfileActive
&& Afile
>= 0 && !(spcl
.c_flags
& DR_EXTATTRIBUTES
)) {
294 /* When we dump an inode which is not a directory,
295 * it means we ended the archive contents */
296 if (isspcl
&& (spcl
.c_type
== TS_INODE
) &&
297 ((spcl
.c_dinode
.di_mode
& S_IFMT
) != IFDIR
))
301 tmp
= *(union u_spcl
*)dp
;
302 /* Write the record, _uncompressed_ */
304 tmp
.s_spcl
.c_flags
&= ~DR_COMPRESSED
;
307 if (write(Afile
, &tmp
, TP_BSIZE
) != TP_BSIZE
)
308 msg("error writing archive file: %s\n",
315 lastspclrec
= spcl
.c_tapea
;
323 dumpblock(blk_t blkno
, int size
)
328 dblkno
= fsbtodb(sblock
, blkno
);
329 tpblks
= size
>> tp_bshift
;
330 while ((avail
= MIN(tpblks
, ntrec
- trecno
)) > 0) {
331 slp
->req
[trecno
].dblk
= dblkno
;
332 slp
->req
[trecno
].count
= avail
;
334 spcl
.c_tapea
+= avail
;
337 dblkno
+= avail
<< (tp_bshift
- dev_bshift
);
349 msg("write error on %s: %s\n", tape
, strerror(errnum
));
350 quit("Cannot recover\n");
353 msg("write error %d blocks into volume %d: %s\n",
354 blocksthisvol
, tapeno
, strerror(errnum
));
355 broadcast("DUMP WRITE ERROR!\n");
356 if (query("Do you want to rewrite this volume?")) {
357 msg("Closing this volume. Prepare to restart with new media;\n");
358 msg("this dump volume will be rewritten.\n");
364 if (query("Do you want to start the next tape?"))
370 sigpipe(UNUSED(int signo
))
373 quit("Broken pipe\n");
378 * Update xferrate stats
387 ttaken
= tnow
- tstart_volume
;
388 blocks
= spcl
.c_tapea
- tapea_volume
;
389 msg("Volume %d completed at: %s", tapeno
, ctime(&tnow
));
391 msg("Volume %d %ld blocks (%.2fMB)\n", tapeno
,
392 blocks
, ((double)blocks
* TP_BSIZE
/ 1048576));
394 long volkb
= (bytes_written
- tapea_bytes
) / 1024;
395 long txfrate
= volkb
/ ttaken
;
396 msg("Volume %d took %d:%02d:%02d\n", tapeno
,
397 ttaken
/ 3600, (ttaken
% 3600) / 60, ttaken
% 60);
398 msg("Volume %d transfer rate: %ld kB/s\n", tapeno
,
402 double rate
= .0005 + (double) blocks
/ (double) volkb
;
403 msg("Volume %d %ldkB uncompressed, %ldkB compressed,"
405 tapeno
, blocks
, volkb
, rate
);
412 mktimeest(time_t tnow
)
414 static char msgbuf
[128];
419 if (blockswritten
< 500)
421 if (blockswritten
> tapesize
)
422 tapesize
= blockswritten
;
423 deltat
= tstart_writing
- tnow
+ (1.0 * (tnow
- tstart_writing
))
424 / blockswritten
* tapesize
;
425 if (tnow
> tstart_volume
)
426 (void)snprintf(msgbuf
, sizeof(msgbuf
),
427 "%3.2f%% done at %ld kB/s, finished in %d:%02d\n",
428 (blockswritten
* 100.0) / tapesize
,
429 (spcl
.c_tapea
- tapea_volume
) / (tnow
- tstart_volume
),
430 (int)(deltat
/ 3600), (int)((deltat
% 3600) / 60));
432 (void)snprintf(msgbuf
, sizeof(msgbuf
),
433 "%3.2f%% done, finished in %d:%02d\n",
434 (blockswritten
* 100.0) / tapesize
,
435 (int)(deltat
/ 3600), (int)((deltat
% 3600) / 60));
443 * information message upon receipt of SIGINFO
446 statussig(int notused
)
448 int save_errno
= errno
;
451 buf
= mktimeest(time(NULL
));
453 write(STDERR_FILENO
, buf
, strlen(buf
));
463 struct slave_results returned
;
465 int siz
= (char *)nextblock
- (char *)slp
->req
;
467 /* make sure returned has sane values in case we don't read
468 * them from the slave in this pass */
469 returned
.unclen
= returned
.clen
= writesize
;
471 slp
->req
[trecno
].count
= 0; /* Sentinel */
473 if (dump_atomic_write( slp
->fd
, (char *)slp
->req
, siz
) != siz
)
474 quit("error writing command pipe: %s\n", strerror(errno
));
475 slp
->sent
= 1; /* we sent a request, read the response later */
477 lastfirstrec
= slp
->firstrec
;
479 if (++slp
>= &slaves
[SLAVES
])
482 /* Read results back from next slave */
484 if (dump_atomic_read( slp
->fd
, (char *)&returned
, sizeof returned
)
485 != sizeof returned
) {
486 perror(" DUMP: error reading command pipe in master");
489 got
= returned
.unclen
;
490 bytes_written
+= returned
.clen
;
491 if (returned
.unclen
== returned
.clen
)
495 /* Check for errors or end of tape */
497 /* Check for errors */
501 msg("End of tape detected\n");
504 * Drain the results, don't care what the values were.
505 * If we read them here then trewind won't...
507 for (i
= 0; i
< SLAVES
; i
++) {
508 if (slaves
[i
].sent
) {
509 if (dump_atomic_read( slaves
[i
].fd
,
510 (char *)&returned
, sizeof returned
)
511 != sizeof returned
) {
512 perror(" DUMP: error reading command pipe in master");
526 if (spcl
.c_type
== TS_CLRI
|| spcl
.c_type
== TS_BITS
)
529 if (spcl
.c_type
!= TS_END
) {
530 for (i
= 0; i
< spcl
.c_count
; i
++)
531 if (spcl
.c_addr
[i
] != 0)
535 slp
->count
= lastspclrec
+ blks
+ 1 - spcl
.c_tapea
;
536 slp
->tapea
= spcl
.c_tapea
;
537 slp
->firstrec
= lastfirstrec
+ ntrec
;
539 nextblock
= slp
->tblock
;
541 asize
+= tenths
+ returned
.clen
/ density
;
542 blockswritten
+= ntrec
;
543 blocksthisvol
+= ntrec
;
544 if (!pipeout
&& !unlimited
) {
545 if (blocksperfiles
&& blocksperfiles
[blocksperfiles_current
]) {
546 if ( compressed
? (bytes_written
- tapea_bytes
+ SLAVES
* (writesize
+ sizeof(struct tapebuf
))) >= (((long long)blocksperfiles
[blocksperfiles_current
]) * 1024)
547 : blocksthisvol
>= blocksperfiles
[blocksperfiles_current
] ) {
552 else if (asize
> tsize
) {
565 struct slave_results returned
;
567 for (f
= 0; f
< SLAVES
; f
++) {
569 * Drain the results, but unlike EOT we DO (or should) care
570 * what the return values were, since if we detect EOT after
571 * we think we've written the last blocks to the tape anyway,
572 * we have to replay those blocks with rollforward.
574 * fixme: punt for now.
576 if (slaves
[f
].sent
) {
577 if (dump_atomic_read( slaves
[f
].fd
, (char *)&returned
, sizeof returned
)
578 != sizeof returned
) {
579 perror(" DUMP: error reading command pipe in master");
582 got
= returned
.unclen
;
583 bytes_written
+= returned
.clen
;
584 if (returned
.unclen
== returned
.clen
)
592 msg("EOT detected in last 2 tape records!\n");
593 msg("Use a longer tape, decrease the size estimate\n");
594 quit("or use no size estimate at all.\n");
597 (void) close(slaves
[f
].fd
);
599 while (wait((int *)NULL
) >= 0) /* wait for any signals from slaves */
604 msg("Closing %s\n", tape
);
609 while (rmtopen(tape
, O_RDONLY
) < 0)
616 (void) close(tapefd
);
618 while ((f
= OPEN(tape
, O_RDONLY
)) < 0)
634 msg("Launching %s\n", eot_script
);
635 eot_code
= system_command(eot_script
, tape
, tapeno
);
637 if (eot_code
!= 0 && eot_code
!= 1) {
638 msg("Dump aborted by the end of tape script\n");
643 if (nexttape
|| Mflag
)
646 msg("Change Volumes: Mount volume #%d\n", tapeno
+1);
647 broadcast("CHANGE DUMP VOLUMES!\7\7\n");
649 while (!query("Is the new volume mounted and ready to go?"))
650 if (query("Do you want to abort?")) {
659 struct req
*p
, *q
= NULL
, *prev
;
661 int i
, size
, savedtapea
, got
;
662 union u_spcl
*ntb
, *otb
;
663 struct slave_results returned
;
668 tslp
= &slaves
[SLAVES
];
669 ntb
= (union u_spcl
*)tslp
->tblock
[1];
671 /* make sure returned has sane values in case we don't read
672 * them from the slave in this pass */
673 returned
.unclen
= returned
.clen
= writesize
;
676 * Each of the N slaves should have requests that need to
677 * be replayed on the next tape. Use the extra slave buffers
678 * (slaves[SLAVES]) to construct request lists to be sent to
679 * each slave in turn.
681 for (i
= 0; i
< SLAVES
; i
++) {
683 otb
= (union u_spcl
*)slp
->tblock
;
686 * For each request in the current slave, copy it to tslp.
690 for (p
= slp
->req
; p
->count
> 0; p
+= p
->count
) {
693 *ntb
++ = *otb
++; /* copy the datablock also */
698 quit("rollforward: protocol botch");
710 nextblock
= tslp
->tblock
;
711 savedtapea
= spcl
.c_tapea
;
712 spcl
.c_tapea
= slp
->tapea
;
714 spcl
.c_tapea
= savedtapea
;
715 lastspclrec
= savedtapea
- 1;
717 size
= (char *)ntb
- (char *)q
;
718 if (dump_atomic_write( slp
->fd
, (char *)q
, size
) != size
) {
719 perror(" DUMP: error writing command pipe");
724 lastfirstrec
= slp
->firstrec
;
726 if (++slp
>= &slaves
[SLAVES
])
731 if (prev
->dblk
!= 0) {
733 * If the last one was a disk block, make the
734 * first of this one be the last bit of that disk
737 q
->dblk
= prev
->dblk
+
738 prev
->count
* (TP_BSIZE
/ DEV_BSIZE
);
739 ntb
= (union u_spcl
*)tslp
->tblock
;
742 * It wasn't a disk block. Copy the data to its
743 * new location in the buffer.
746 *((union u_spcl
*)tslp
->tblock
) = *ntb
;
747 ntb
= (union u_spcl
*)tslp
->tblock
[1];
751 nextblock
= slp
->tblock
;
754 /* XXX post increment triggers an egcs-1.1.2-12 bug on alpha/sparc */
755 *(union u_spcl
*)(*nextblock
) = *(union u_spcl
*)tslp
->tblock
;
762 * Clear the first slaves' response. One hopes that it
763 * worked ok, otherwise the tape is much too short!
766 if (dump_atomic_read( slp
->fd
, (char *)&returned
, sizeof returned
)
767 != sizeof returned
) {
768 perror(" DUMP: error reading command pipe in master");
771 got
= returned
.unclen
;
772 bytes_written
+= returned
.clen
;
773 if (returned
.clen
== returned
.unclen
)
781 quit("EOT detected at start of the tape!\n");
787 if (spcl
.c_type
!= TS_END
) {
788 for (i
= 0; i
< spcl
.c_count
; i
++)
789 if (spcl
.c_addr
[i
] != 0)
793 slp
->firstrec
= lastfirstrec
+ ntrec
;
794 slp
->count
= lastspclrec
+ blks
+ 1 - spcl
.c_tapea
;
796 asize
+= tenths
+ returned
.clen
/ density
;
797 blockswritten
+= ntrec
;
798 blocksthisvol
+= ntrec
;
803 #if defined(SYS_clone) && defined(CLONE_IO)
807 return syscall(SYS_clone
, CLONE_ARGS
);
813 * We implement taking and restoring checkpoints on the tape level.
814 * When each tape is opened, a new process is created by forking; this
815 * saves all of the necessary context in the parent. The child
816 * continues the dump; the parent waits around, saving the context.
817 * If the child returns X_REWRITE, then it had problems writing that tape;
818 * this causes the parent to fork again, duplicating the context, and
819 * everything continues as if nothing had happened.
822 startnewtape(int top
)
833 sigaddset(&sigs
, SIGINT
);
834 sigprocmask(SIG_BLOCK
, &sigs
, NULL
);
835 #else /* __linux__ */
837 void (*interrupt_save
)();
839 sig_t interrupt_save
;
841 interrupt_save
= signal(SIGINT
, SIG_IGN
);
842 #endif /* __linux__ */
844 parentpid
= getpid();
845 tapea_volume
= spcl
.c_tapea
;
846 tapea_bytes
= bytes_written
;
847 tstart_volume
= time(NULL
);
851 sigprocmask(SIG_UNBLOCK
, &sigs
, NULL
);
853 (void)signal(SIGINT
, interrupt_save
);
856 * All signals are inherited...
858 childpid
= fork_clone_io();
860 msg("Context save fork fails in parent %d\n", parentpid
);
866 * save the context by waiting
867 * until the child doing all of the work returns.
868 * don't catch the interrupt
871 sigprocmask(SIG_BLOCK
, &sigs
, NULL
);
873 signal(SIGINT
, SIG_IGN
);
876 msg("Tape: %d; parent process: %d child process %d\n",
877 tapeno
+1, parentpid
, childpid
);
879 while ((waitpid
= wait(&status
)) != childpid
)
880 if (waitpid
!= rshpid
)
881 msg("Parent %d waiting for child %d has another child %d return\n",
882 parentpid
, childpid
, waitpid
);
884 msg("Child %d returns LOB status %o\n",
885 childpid
, status
&0xFF);
887 status
= (status
>> 8) & 0xFF;
891 msg("Child %d finishes X_FINOK\n", childpid
);
894 msg("Child %d finishes X_ABORT\n", childpid
);
897 msg("Child %d finishes X_REWRITE\n", childpid
);
900 msg("Child %d finishes unknown %d\n",
911 goto restore_check_point
;
913 msg("Bad return code from dump: %d\n", status
);
917 } else { /* we are the child; just continue */
919 sleep(4); /* allow time for parent's message to get out */
920 msg("Child on Tape %d has parent %d, my pid = %d\n",
921 tapeno
+1, parentpid
, getpid());
924 * If we have a name like "/dev/rmt0,/dev/rmt1",
925 * use the name before the comma first, and save
926 * the remaining names for subsequent volumes.
928 tapeno
++; /* current tape sequence */
930 snprintf(tape
, MAXPATHLEN
, "%s%03d", tapeprefix
, tapeno
);
931 tape
[MAXPATHLEN
- 1] = '\0';
932 msg("Dumping volume %d on %s\n", tapeno
, tape
);
934 else if (nexttape
|| strchr(tapeprefix
, ',')) {
935 if (nexttape
&& *nexttape
)
936 tapeprefix
= nexttape
;
937 if ((p
= strchr(tapeprefix
, ',')) != NULL
) {
942 strncpy(tape
, tapeprefix
, MAXPATHLEN
);
943 tape
[MAXPATHLEN
- 1] = '\0';
944 msg("Dumping volume %d on %s\n", tapeno
, tape
);
946 if (blocksperfiles
&& blocksperfiles_current
< *blocksperfiles
)
947 blocksperfiles_current
++;
949 while ((tapefd
= (host
? rmtopen(tape
, O_WRONLY
|O_CREAT
|O_TRUNC
) : pipeout
?
951 OPEN(tape
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0666))) < 0)
953 while ((tapefd
= (pipeout
? fileno(stdout
) :
954 OPEN(tape
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0666))) < 0)
957 msg("Cannot open output \"%s\": %s\n", tape
,
959 if (!query("Do you want to retry the open?"))
966 struct mtget mt_stat
;
967 magtapeout
= ioctl(tapefd
, MTIOCGET
, (char *)&mt_stat
) == 0;
969 msg("Output is to %s\n",
970 magtapeout ? "tape" : "file/pipe");
974 enslave(); /* Share open tape file descriptor with slaves */
979 newtape
++; /* new tape signal */
980 spcl
.c_count
= slp
->count
;
982 * measure firstrec in TP_BSIZE units since restore doesn't
983 * know the correct ntrec value...
985 spcl
.c_firstrec
= slp
->firstrec
;
987 spcl
.c_type
= TS_TAPE
;
988 spcl
.c_flags
|= DR_NEWHEADER
;
989 spcl
.c_ntrec
= ntrec
;
991 spcl
.c_flags
|= DR_COMPRESSED
;
992 writeheader((dump_ino_t
)slp
->inode
);
993 spcl
.c_flags
&=~ DR_NEWHEADER
;
994 msg("Volume %d started with block %ld at: %s", tapeno
,
995 spcl
.c_tapea
, ctime(&tstart_volume
));
997 msg("Volume %d begins with blocks from inode %d\n",
999 if (tapeno
< (int)TP_NINOS
)
1000 volinfo
[tapeno
] = slp
->inode
;
1005 dumpabort(UNUSED(int signo
))
1008 if (master
!= 0 && master
!= getpid())
1009 /* Signals master to call dumpabort */
1010 (void) kill(master
, SIGTERM
);
1013 msg("The ENTIRE dump is aborted.\n");
1026 msg("pid = %d exits with status %d\n", getpid(), status
);
1032 * proceed - handler for SIGUSR2, used to synchronize IO between the slaves.
1035 proceed(UNUSED(int signo
))
1038 siglongjmp(jmpbuf
, 1);
1046 #ifdef LINUX_FORK_BUG
1054 { struct sigaction sa
;
1055 memset(&sa
, 0, sizeof sa
);
1056 sigemptyset(&sa
.sa_mask
);
1057 sa
.sa_handler
= dumpabort
;
1058 sigaction(SIGTERM
, &sa
, NULL
); /* Slave sends SIGTERM on dumpabort() */
1059 sa
.sa_handler
= sigpipe
;
1060 sigaction(SIGPIPE
, &sa
, NULL
);
1061 sa
.sa_handler
= proceed
;
1062 sa
.sa_flags
= SA_RESTART
;
1063 sigaction(SIGUSR2
, &sa
, NULL
); /* Slave sends SIGUSR2 to next slave */
1066 for (i
= 0; i
< SLAVES
; i
++) {
1067 if (i
== slp
- &slaves
[0]) {
1073 if (socketpair(AF_UNIX
, SOCK_STREAM
, 0, cmd
) < 0 ||
1074 (slaves
[i
].pid
= fork_clone_io()) < 0)
1075 quit("too many slaves, %d (recompile smaller): %s\n",
1076 i
, strerror(errno
));
1078 slaves
[i
].fd
= cmd
[1];
1080 if (slaves
[i
].pid
== 0) { /* Slave starts up here */
1082 for (j
= 0; j
<= i
; j
++)
1083 (void) close(slaves
[j
].fd
);
1085 sigaddset(&sigs
, SIGINT
); /* Master handles this */
1086 #if defined(SIGINFO)
1087 sigaddset(&sigs
, SIGINFO
);
1089 sigprocmask(SIG_BLOCK
, &sigs
, NULL
);
1091 #ifdef LINUX_FORK_BUG
1092 if (dump_atomic_write( cmd
[0], (char *) &i
, sizeof i
)
1094 quit("master/slave protocol botched 3\n");
1100 (slaves
[i
].pid
== slp
->pid
));
1107 #ifdef LINUX_FORK_BUG
1109 * Wait for all slaves to _actually_ start to circumvent a bug in
1110 * Linux kernels >= 2.1.3 where a signal sent to a child that hasn't
1111 * returned from fork() causes a SEGV in the child process
1113 for (i
= 0; i
< SLAVES
; i
++)
1114 if (dump_atomic_read( slaves
[i
].fd
, (char *) &j
, sizeof j
) != sizeof j
)
1115 quit("master/slave protocol botched 4\n");
1118 for (i
= 0; i
< SLAVES
; i
++)
1119 (void) dump_atomic_write( slaves
[i
].fd
,
1120 (char *) &slaves
[(i
+ 1) % SLAVES
].pid
,
1121 sizeof slaves
[0].pid
);
1131 for (i
= 0; i
< SLAVES
; i
++)
1132 if (slaves
[i
].pid
> 0) {
1133 (void) kill(slaves
[i
].pid
, SIGKILL
);
1139 * Synchronization - each process waits for a SIGUSR2 from the
1140 * previous process before writing to the tape, and sends SIGUSR2
1141 * to the next process when the tape write completes. On tape errors
1142 * a SIGUSR1 is sent to the master which then terminates all of the
1154 volatile int wrote
= 0, size
, eot_count
, bufsize
;
1155 char * volatile buffer
;
1156 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1157 struct tapebuf
* volatile comp_buf
= NULL
;
1159 volatile int do_compress
= !first
;
1160 unsigned long worklen
;
1162 lzo_align_t __LZO_MMODEL
*LZO_WorkMem
;
1164 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1165 struct slave_results returns
;
1170 long long curtapepos
;
1171 union u_spcl
*uspclptr
;
1172 struct s_spcl
*spclptr
;
1173 /* long maxntrecs = 300000000 / (ntrec * 1024); last tested: 50 000 000 */
1174 long maxntrecs
= 50000; /* every 50MB */
1175 long cntntrecs
= maxntrecs
;
1176 #endif /* USE_QFA */
1180 sigaddset(&set
, SIGUSR2
);
1181 sigprocmask(SIG_BLOCK
, &set
, NULL
);
1185 * Need our own seek pointer.
1187 (void) close(diskfd
);
1188 if ((diskfd
= OPEN(disk
, O_RDONLY
)) < 0)
1189 quit("slave couldn't reopen disk: %s\n", strerror(errno
));
1192 (void)ioctl(diskfd
, BLKFLSBUF
, 0);
1195 retval
= dump_fs_open(disk
, &fs
);
1197 quit("slave couldn't reopen disk: %s\n", error_message(retval
));
1198 #endif /* __linux__ */
1201 * Need the pid of the next slave in the loop...
1203 if ((nread
= dump_atomic_read( cmd
, (char *)&nextslave
, sizeof nextslave
))
1204 != sizeof nextslave
) {
1205 quit("master/slave protocol botched - didn't get pid of next slave.\n");
1208 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1209 /* if we're doing a compressed dump, allocate the compress buffer */
1211 int bsiz
= sizeof(struct tapebuf
) + writesize
;
1212 /* Add extra space to deal with compression enlarging the buffer */
1213 if (TP_BSIZE
> writesize
/16 + 67)
1216 bsiz
+= writesize
/16 + 67;
1217 comp_buf
= malloc(bsiz
);
1218 if (comp_buf
== NULL
)
1219 quit("couldn't allocate a compress buffer.\n");
1220 if (zipflag
== COMPRESS_ZLIB
)
1221 comp_buf
->flags
= COMPRESS_ZLIB
;
1222 else if (zipflag
== COMPRESS_BZLIB
)
1223 comp_buf
->flags
= COMPRESS_BZLIB
;
1224 else if (zipflag
== COMPRESS_LZO
) {
1225 comp_buf
->flags
= COMPRESS_LZO
;
1226 if (lzo_init() != LZO_E_OK
) quit("lzo_init failed\n");
1228 quit("internal error - unknown compression method: %d\n", zipflag
);
1231 LZO_WorkMem
= malloc(LZO1X_1_MEM_COMPRESS
);
1233 quit("couldn't allocate a compress buffer.\n");
1235 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1238 * Get list of blocks to dump, read the blocks into tape buffer
1240 while ((nread
= dump_atomic_read( cmd
, (char *)slp
->req
, reqsiz
)) == reqsiz
) {
1241 struct req
*p
= slp
->req
;
1243 for (trecno
= 0; trecno
< ntrec
;
1244 trecno
+= p
->count
, p
+= p
->count
) {
1245 if (p
->dblk
) { /* read a disk block */
1246 bread(p
->dblk
, slp
->tblock
[trecno
],
1247 p
->count
* TP_BSIZE
);
1248 } else { /* read record from pipe */
1249 if (p
->count
!= 1 || dump_atomic_read( cmd
,
1250 (char *)slp
->tblock
[trecno
],
1251 TP_BSIZE
) != TP_BSIZE
)
1252 quit("master/slave protocol botched.\n");
1256 /* Try to write the data... */
1260 buffer
= (char *) slp
->tblock
[0]; /* set write pointer */
1261 bufsize
= writesize
; /* length to write */
1262 returns
.clen
= returns
.unclen
= bufsize
;
1264 #if defined(HAVE_ZLIB) || defined(HAVE_BZLIB) || defined(HAVE_LZO)
1266 * When writing a compressed dump, each block except
1267 * the first one on each tape is written
1268 * from struct tapebuf with an 4 byte prefix
1269 * followed by the data. This can be less than
1270 * writesize. Restore, on a short read, can compare the
1271 * length read to the compressed length in the header
1272 * to verify that the read was good. Blocks which don't
1273 * compress well are written uncompressed.
1274 * The first block written by each slave is not compressed
1275 * and does not have a prefix.
1278 if (compressed
&& do_compress
) {
1279 comp_buf
->length
= bufsize
;
1280 worklen
= TP_BSIZE
+ writesize
;
1283 if (zipflag
== COMPRESS_ZLIB
) {
1284 compresult
= compress2(comp_buf
->buf
,
1286 (char *)slp
->tblock
[0],
1289 if (compresult
== Z_OK
)
1294 #endif /* HAVE_ZLIB */
1296 if (zipflag
== COMPRESS_BZLIB
) {
1297 unsigned int worklen2
= worklen
;
1298 compresult
= BZ2_bzBuffToBuffCompress(
1301 (char *)slp
->tblock
[0],
1306 if (compresult
== BZ_OK
)
1312 #endif /* HAVE_BZLIB */
1314 if (zipflag
== COMPRESS_LZO
) {
1315 lzo_uint worklen2
= worklen
;
1316 compresult
= lzo1x_1_compress((char *)slp
->tblock
[0],writesize
,
1321 if (compresult
== LZO_E_OK
)
1326 #endif /* HAVE_LZO */
1327 if (compresult
&& worklen
<= ((unsigned long)writesize
- 16)) {
1328 /* write the compressed buffer */
1329 comp_buf
->length
= worklen
;
1330 comp_buf
->compressed
= 1;
1331 buffer
= (char *) comp_buf
;
1332 returns
.clen
= bufsize
= worklen
+ sizeof(struct tapebuf
);
1335 /* write the data uncompressed */
1336 comp_buf
->length
= writesize
;
1337 comp_buf
->compressed
= 0;
1338 buffer
= (char *) comp_buf
;
1339 returns
.clen
= bufsize
= writesize
+ sizeof(struct tapebuf
);
1340 returns
.unclen
= returns
.clen
;
1341 memcpy(comp_buf
->buf
, (char *)slp
->tblock
[0], writesize
);
1344 /* compress the remaining blocks if we're compressing */
1345 do_compress
= compressed
;
1346 #endif /* HAVE_ZLIB || HAVE_BZLIB || HAVE_LZO */
1348 if (sigsetjmp(jmpbuf
, 1) == 0) {
1357 if (gTapeposfd
>= 0) {
1361 for (i
= 0; (i
< ntrec
) && !foundone
; ++i
) {
1362 uspclptr
= (union u_spcl
*)&slp
->tblock
[i
];
1363 spclptr
= &uspclptr
->s_spcl
;
1364 if ((spclptr
->c_magic
== NFS_MAGIC
) &&
1365 (spclptr
->c_type
== TS_INODE
) &&
1366 (spclptr
->c_date
== gThisDumpDate
) &&
1367 !(spclptr
->c_dinode
.di_mode
& S_IFDIR
) &&
1368 !(spclptr
->c_flags
& DR_EXTATTRIBUTES
)
1371 /* if (cntntrecs >= maxntrecs) { only write every maxntrecs amount of data */
1374 gtperr
= GetTapePos(&curtapepos
);
1375 /* if an error occured previously don't
1379 msg("inode %ld at tapepos %ld\n", spclptr
->c_inumber
, curtapepos
);
1381 gtperr
= MkTapeString(spclptr
, curtapepos
);
1387 #endif /* USE_QFA */
1389 while (eot_count
< 10 && size
< bufsize
) {
1392 wrote
= rmtwrite(buffer
+ size
, bufsize
- size
);
1395 wrote
= write(tapefd
, buffer
+ size
, bufsize
- size
);
1397 printf("slave %d wrote %d\n", slave_number
, wrote
);
1399 if (wrote
< 0 && errno
!= ENOSPC
)
1401 if (wrote
== 0 || (wrote
< 0 && errno
== ENOSPC
))
1408 if (size
!= bufsize
)
1409 printf("slave %d only wrote %d out of %d bytes and gave up.\n",
1410 slave_number
, size
, bufsize
);
1414 * Handle ENOSPC as an EOT condition.
1416 if (wrote
< 0 && errno
== ENOSPC
) {
1422 returns
.clen
= returns
.unclen
= 0;
1425 * pass errno back to master for special handling
1428 returns
.unclen
= -errno
;
1431 * pass size of data and size of write back to master
1432 * (for EOT handling)
1434 (void) dump_atomic_write( cmd
, (char *)&returns
, sizeof returns
);
1437 * Signal the next slave to go.
1439 (void) kill(nextslave
, SIGUSR2
);
1441 if (gTapeposfd
>= 0) {
1444 #endif /* USE_QFA */
1447 quit("error reading command pipe: %s\n", strerror(errno
));
1451 * Since a read from a pipe may not return all we asked for,
1452 * or a write may not write all we ask if we get a signal,
1453 * loop until the count is satisfied (or error).
1456 dump_atomic_read(int fd
, char *buf
, size_t count
)
1458 int got
, need
= count
;
1461 while ((got
= read(fd
, buf
, need
)) > 0 && (need
-= got
) > 0)
1463 } while (got
== -1 && errno
== EINTR
);
1464 return (got
< 0 ? got
: (ssize_t
)count
- need
);
1468 * Since a read from a pipe may not return all we asked for,
1469 * or a write may not write all we ask if we get a signal,
1470 * loop until the count is satisfied (or error).
1473 dump_atomic_write(int fd
, const char *buf
, size_t count
)
1475 int got
, need
= count
;
1478 while ((got
= write(fd
, buf
, need
)) > 0 && (need
-= got
) > 0)
1480 } while (got
== -1 && errno
== EINTR
);
1481 return (got
< 0 ? got
: (ssize_t
)count
- need
);
1492 buf.mt_op = MTSETDRVBUFFER;
1493 buf.mt_count = MT_ST_BOOLEANS | MT_ST_SCSI2LOGICAL;
1494 if (ioctl(tapefd, MTIOCTOP, &buf) == -1) {
1496 msg("[%ld] error: %d (setting logical)\n",
1497 (unsigned long)getpid(), err);
1504 #define LSEEK_GET_TAPEPOS 10
1505 #define LSEEK_GO2_TAPEPOS 11
1507 * read the current tape position
1510 GetTapePos(long long *pos
)
1516 *pos
= (long long) rmtseek((OFF_T
)0, (int)LSEEK_GET_TAPEPOS
);
1525 err
= (ioctl(tapefd
, MTIOCPOS
, &mtpos
) < 0);
1526 *pos
= (long long)mtpos
;
1529 *pos
= LSEEK(tapefd
, 0, SEEK_CUR
);
1535 msg("[%ld] error: %d (getting tapepos: %lld)\n", getpid(),
1543 MkTapeString(struct s_spcl
*spclptr
, long long curtapepos
)
1548 msg("inode %ld at tapepos %lld\n", spclptr
->c_inumber
, curtapepos
);
1551 snprintf(gTps
, sizeof(gTps
), "%ld\t%d\t%lld\n",
1552 (unsigned long)spclptr
->c_inumber
,
1555 gTps
[sizeof(gTps
) - 1] = '\0';
1556 if (write(gTapeposfd
, gTps
, strlen(gTps
)) != (ssize_t
)strlen(gTps
)) {
1558 warn("error writing tapepos file. (error %d)\n", errno
);
1562 #endif /* USE_QFA */