Commit | Line | Data |
---|---|---|
b6407c9d | 1 | static char *sccsid = "@(#)tape.c 1.5 (Berkeley) %G%"; |
ae4b153c BJ |
2 | #include "dump.h" |
3 | ||
f5bba473 KM |
4 | char tblock[NTREC][TP_BSIZE]; |
5 | int trecno = 0; | |
ae4b153c BJ |
6 | |
7 | taprec(dp) | |
b6407c9d | 8 | char *dp; |
ae4b153c BJ |
9 | { |
10 | register i; | |
11 | ||
b6407c9d | 12 | for (i=0; i < TP_BSIZE; i++) |
ae4b153c | 13 | tblock[trecno][i] = *dp++; |
ae4b153c BJ |
14 | trecno++; |
15 | spcl.c_tapea++; | |
16 | if(trecno >= NTREC) | |
17 | flusht(); | |
18 | } | |
19 | ||
f5bba473 KM |
20 | dmpblk(blkno, size) |
21 | daddr_t blkno; | |
22 | int size; | |
ae4b153c | 23 | { |
b6407c9d | 24 | int avail, tpblks, dblkno; |
f5bba473 | 25 | |
b6407c9d | 26 | if (size % TP_BSIZE != 0) |
f5bba473 KM |
27 | msg("bad size to dmpblk: %d\n", size); |
28 | avail = NTREC - trecno; | |
b6407c9d KM |
29 | dblkno = fsbtodb(sblock, blkno); |
30 | for (tpblks = size / TP_BSIZE; tpblks > avail; ) { | |
31 | bread(dblkno, tblock[trecno], TP_BSIZE * avail); | |
f5bba473 KM |
32 | trecno += avail; |
33 | spcl.c_tapea += avail; | |
34 | flusht(); | |
b6407c9d KM |
35 | dblkno += avail * (TP_BSIZE / DEV_BSIZE); |
36 | tpblks -= avail; | |
f5bba473 KM |
37 | avail = NTREC - trecno; |
38 | } | |
b6407c9d KM |
39 | bread(dblkno, tblock[trecno], TP_BSIZE * tpblks); |
40 | trecno += tpblks; | |
41 | spcl.c_tapea += tpblks; | |
ae4b153c BJ |
42 | if(trecno >= NTREC) |
43 | flusht(); | |
44 | } | |
45 | ||
46 | int nogripe = 0; | |
47 | ||
48 | flusht() | |
49 | { | |
50 | register i, si; | |
51 | daddr_t d; | |
52 | ||
ae4b153c BJ |
53 | trecno = 0; |
54 | if (write(to, tblock[0], sizeof(tblock)) != sizeof(tblock) ){ | |
55 | msg("Tape write error on tape %d\n", tapeno); | |
56 | broadcast("TAPE ERROR!\n"); | |
57 | if (query("Do you want to restart?")){ | |
58 | msg("This tape will rewind. After it is rewound,\n"); | |
59 | msg("replace the faulty tape with a new one;\n"); | |
ed7c701e | 60 | msg("this dump volume will be rewritten.\n"); |
ae4b153c BJ |
61 | /* |
62 | * Temporarily change the tapeno identification | |
63 | */ | |
64 | tapeno--; | |
65 | nogripe = 1; | |
66 | close_rewind(); | |
67 | nogripe = 0; | |
68 | tapeno++; | |
69 | Exit(X_REWRITE); | |
70 | } else { | |
71 | dumpabort(); | |
72 | /*NOTREACHED*/ | |
73 | } | |
74 | } | |
75 | ||
76 | asize += sizeof(tblock)/density; | |
77 | asize += 7; | |
78 | blockswritten += NTREC; | |
79 | if (asize > tsize) { | |
80 | close_rewind(); | |
81 | otape(); | |
82 | } | |
83 | timeest(); | |
84 | } | |
85 | ||
86 | rewind() | |
87 | { | |
88 | int secs; | |
be3f486f | 89 | int f; |
ae4b153c BJ |
90 | #ifdef DEBUG |
91 | msg("Waiting 10 seconds to rewind.\n"); | |
92 | sleep(10); | |
93 | #else | |
94 | /* | |
95 | * It takes about 3 minutes, 25secs to rewind 2300' of tape | |
96 | */ | |
be3f486f BJ |
97 | msg("Tape rewinding\n", secs); |
98 | close(to); | |
99 | while ((f = open(tape, 0)) < 0) | |
100 | sleep (10); | |
101 | close(f); | |
ae4b153c BJ |
102 | #endif |
103 | } | |
104 | ||
105 | close_rewind() | |
106 | { | |
107 | close(to); | |
108 | if (!nogripe){ | |
109 | rewind(); | |
110 | msg("Change Tapes: Mount tape #%d\n", tapeno+1); | |
111 | broadcast("CHANGE TAPES!\7\7\n"); | |
112 | } | |
113 | do{ | |
114 | if (query ("Is the new tape mounted and ready to go?")) | |
115 | break; | |
116 | if (query ("Do you want to abort?")){ | |
117 | dumpabort(); | |
118 | /*NOTREACHED*/ | |
119 | } | |
120 | } while (1); | |
121 | } | |
122 | ||
123 | /* | |
124 | * We implement taking and restoring checkpoints on | |
125 | * the tape level. | |
126 | * When each tape is opened, a new process is created by forking; this | |
127 | * saves all of the necessary context in the parent. The child | |
128 | * continues the dump; the parent waits around, saving the context. | |
129 | * If the child returns X_REWRITE, then it had problems writing that tape; | |
130 | * this causes the parent to fork again, duplicating the context, and | |
131 | * everything continues as if nothing had happened. | |
132 | */ | |
133 | ||
134 | otape() | |
135 | { | |
136 | int parentpid; | |
137 | int childpid; | |
138 | int status; | |
139 | int waitpid; | |
140 | int sig_ign_parent(); | |
141 | int interrupt(); | |
142 | ||
143 | /* | |
144 | * Force the tape to be closed | |
145 | */ | |
146 | close(to); | |
147 | parentpid = getpid(); | |
148 | ||
149 | restore_check_point: | |
150 | signal(SIGINT, interrupt); | |
151 | /* | |
152 | * All signals are inherited... | |
153 | */ | |
154 | childpid = fork(); | |
155 | if (childpid < 0){ | |
156 | msg("Context save fork fails in parent %d\n", parentpid); | |
157 | Exit(X_ABORT); | |
158 | } | |
159 | if (childpid != 0){ | |
160 | /* | |
161 | * PARENT: | |
162 | * save the context by waiting | |
163 | * until the child doing all of the work returns. | |
164 | * don't catch the interrupt | |
165 | */ | |
166 | signal(SIGINT, SIG_IGN); | |
167 | #ifdef TDEBUG | |
168 | msg("Tape: %d; parent process: %d child process %d\n", | |
169 | tapeno+1, parentpid, childpid); | |
170 | #endif TDEBUG | |
171 | for (;;){ | |
172 | waitpid = wait(&status); | |
173 | if (waitpid != childpid){ | |
174 | msg("Parent %d waiting for child %d has another child %d return\n", | |
175 | parentpid, childpid, waitpid); | |
176 | } else | |
177 | break; | |
178 | } | |
179 | if (status & 0xFF){ | |
180 | msg("Child %d returns LOB status %o\n", | |
181 | childpid, status&0xFF); | |
182 | } | |
183 | status = (status >> 8) & 0xFF; | |
184 | #ifdef TDEBUG | |
185 | switch(status){ | |
186 | case X_FINOK: | |
187 | msg("Child %d finishes X_FINOK\n", childpid); | |
188 | break; | |
189 | case X_ABORT: | |
190 | msg("Child %d finishes X_ABORT\n", childpid); | |
191 | break; | |
192 | case X_REWRITE: | |
193 | msg("Child %d finishes X_REWRITE\n", childpid); | |
194 | break; | |
195 | default: | |
196 | msg("Child %d finishes unknown %d\n", childpid,status); | |
197 | break; | |
198 | } | |
199 | #endif TDEBUG | |
200 | switch(status){ | |
201 | case X_FINOK: | |
202 | Exit(X_FINOK); | |
203 | case X_ABORT: | |
204 | Exit(X_ABORT); | |
205 | case X_REWRITE: | |
206 | goto restore_check_point; | |
207 | default: | |
208 | msg("Bad return code from dump: %d\n", status); | |
209 | Exit(X_ABORT); | |
210 | } | |
211 | /*NOTREACHED*/ | |
212 | } else { /* we are the child; just continue */ | |
213 | #ifdef TDEBUG | |
214 | sleep(4); /* allow time for parent's message to get out */ | |
215 | msg("Child on Tape %d has parent %d, my pid = %d\n", | |
216 | tapeno+1, parentpid, getpid()); | |
217 | #endif | |
218 | do{ | |
219 | to = creat(tape, 0666); | |
220 | if (to < 0) { | |
221 | if (!query("Cannot open tape. Do you want to retry the open?")) | |
222 | dumpabort(); | |
223 | } else break; | |
224 | } while (1); | |
225 | ||
226 | asize = 0; | |
227 | tapeno++; /* current tape sequence */ | |
228 | newtape++; /* new tape signal */ | |
229 | spcl.c_volume++; | |
230 | spcl.c_type = TS_TAPE; | |
231 | spclrec(); | |
232 | if (tapeno > 1) | |
233 | msg("Tape %d begins with blocks from ino %d\n", | |
234 | tapeno, ino); | |
235 | } | |
236 | } | |
237 | ||
238 | /* | |
239 | * The parent still catches interrupts, but does nothing with them | |
240 | */ | |
241 | sig_ign_parent() | |
242 | { | |
243 | msg("Waiting parent receives interrupt\n"); | |
244 | signal(SIGINT, sig_ign_parent); | |
245 | } | |
246 | ||
247 | dumpabort() | |
248 | { | |
ed7c701e | 249 | msg("The ENTIRE dump is aborted.\n"); |
ae4b153c BJ |
250 | Exit(X_ABORT); |
251 | } | |
252 | ||
253 | Exit(status) | |
254 | { | |
255 | #ifdef TDEBUG | |
256 | msg("pid = %d exits with status %d\n", getpid(), status); | |
257 | #endif TDEBUG | |
ed7c701e | 258 | exit(status); |
ae4b153c | 259 | } |