Commit | Line | Data |
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0f4556f1 | 1 | static char *sccsid = "@(#)dumptape.c 1.3 (Berkeley) 4/28/83"; |
ae4b153c BJ |
2 | #include "dump.h" |
3 | ||
4 | char tblock[NTREC][BSIZE]; | |
5 | daddr_t tdaddr[NTREC]; | |
6 | int trecno; | |
7 | ||
8 | taprec(dp) | |
9 | char *dp; | |
10 | { | |
11 | register i; | |
12 | ||
13 | for(i=0; i<BSIZE; i++) | |
14 | tblock[trecno][i] = *dp++; | |
15 | tdaddr[trecno] = 0; | |
16 | trecno++; | |
17 | spcl.c_tapea++; | |
18 | if(trecno >= NTREC) | |
19 | flusht(); | |
20 | } | |
21 | ||
22 | tapsrec(d) | |
23 | daddr_t d; | |
24 | { | |
25 | ||
26 | if(d == 0) | |
27 | return; | |
28 | tdaddr[trecno] = d; | |
29 | trecno++; | |
30 | spcl.c_tapea++; | |
31 | if(trecno >= NTREC) | |
32 | flusht(); | |
33 | } | |
34 | ||
35 | int nogripe = 0; | |
36 | ||
37 | flusht() | |
38 | { | |
39 | register i, si; | |
40 | daddr_t d; | |
41 | ||
42 | while(trecno < NTREC) | |
43 | tdaddr[trecno++] = 1; | |
44 | ||
45 | loop: | |
46 | d = 0; | |
47 | for(i=0; i<NTREC; i++) | |
48 | if(tdaddr[i] != 0) | |
49 | if(d == 0 || tdaddr[i] < d) { | |
50 | si = i; | |
51 | d = tdaddr[i]; | |
52 | } | |
53 | if(d != 0) { | |
54 | bread(d, tblock[si], BSIZE); | |
55 | tdaddr[si] = 0; | |
56 | goto loop; | |
57 | } | |
58 | trecno = 0; | |
59 | if (write(to, tblock[0], sizeof(tblock)) != sizeof(tblock) ){ | |
2a729b17 KM |
60 | if (pipeout) { |
61 | msg("Tape write error on %s\n", tape); | |
62 | msg("Cannot recover\n"); | |
63 | dumpabort(); | |
64 | /*NOTREACHED*/ | |
65 | } | |
ae4b153c BJ |
66 | msg("Tape write error on tape %d\n", tapeno); |
67 | broadcast("TAPE ERROR!\n"); | |
68 | if (query("Do you want to restart?")){ | |
69 | msg("This tape will rewind. After it is rewound,\n"); | |
70 | msg("replace the faulty tape with a new one;\n"); | |
ed7c701e | 71 | msg("this dump volume will be rewritten.\n"); |
ae4b153c BJ |
72 | /* |
73 | * Temporarily change the tapeno identification | |
74 | */ | |
75 | tapeno--; | |
76 | nogripe = 1; | |
77 | close_rewind(); | |
78 | nogripe = 0; | |
79 | tapeno++; | |
80 | Exit(X_REWRITE); | |
81 | } else { | |
82 | dumpabort(); | |
83 | /*NOTREACHED*/ | |
84 | } | |
85 | } | |
86 | ||
87 | asize += sizeof(tblock)/density; | |
88 | asize += 7; | |
89 | blockswritten += NTREC; | |
2a729b17 | 90 | if (!pipeout && asize > tsize) { |
ae4b153c BJ |
91 | close_rewind(); |
92 | otape(); | |
93 | } | |
94 | timeest(); | |
95 | } | |
96 | ||
97 | rewind() | |
98 | { | |
99 | int secs; | |
100 | #ifdef DEBUG | |
101 | msg("Waiting 10 seconds to rewind.\n"); | |
102 | sleep(10); | |
103 | #else | |
104 | /* | |
105 | * It takes about 3 minutes, 25secs to rewind 2300' of tape | |
106 | */ | |
107 | secs = (( (60*3) + 25)*asize)/(2300L*12L*10L); | |
108 | msg("Waiting %d seconds to rewind.\n", secs); | |
109 | sleep(secs); | |
110 | #endif | |
111 | } | |
112 | ||
113 | close_rewind() | |
114 | { | |
2a729b17 KM |
115 | if (pipeout) |
116 | return; | |
ae4b153c BJ |
117 | close(to); |
118 | if (!nogripe){ | |
119 | rewind(); | |
120 | msg("Change Tapes: Mount tape #%d\n", tapeno+1); | |
121 | broadcast("CHANGE TAPES!\7\7\n"); | |
122 | } | |
123 | do{ | |
124 | if (query ("Is the new tape mounted and ready to go?")) | |
125 | break; | |
126 | if (query ("Do you want to abort?")){ | |
127 | dumpabort(); | |
128 | /*NOTREACHED*/ | |
129 | } | |
130 | } while (1); | |
131 | } | |
132 | ||
133 | /* | |
134 | * We implement taking and restoring checkpoints on | |
135 | * the tape level. | |
136 | * When each tape is opened, a new process is created by forking; this | |
137 | * saves all of the necessary context in the parent. The child | |
138 | * continues the dump; the parent waits around, saving the context. | |
139 | * If the child returns X_REWRITE, then it had problems writing that tape; | |
140 | * this causes the parent to fork again, duplicating the context, and | |
141 | * everything continues as if nothing had happened. | |
142 | */ | |
143 | ||
144 | otape() | |
145 | { | |
146 | int parentpid; | |
147 | int childpid; | |
148 | int status; | |
149 | int waitpid; | |
150 | int sig_ign_parent(); | |
151 | int interrupt(); | |
152 | ||
153 | /* | |
154 | * Force the tape to be closed | |
155 | */ | |
2a729b17 KM |
156 | if (!pipeout) |
157 | close(to); | |
ae4b153c BJ |
158 | parentpid = getpid(); |
159 | ||
160 | restore_check_point: | |
161 | signal(SIGINT, interrupt); | |
162 | /* | |
163 | * All signals are inherited... | |
164 | */ | |
165 | childpid = fork(); | |
166 | if (childpid < 0){ | |
167 | msg("Context save fork fails in parent %d\n", parentpid); | |
168 | Exit(X_ABORT); | |
169 | } | |
170 | if (childpid != 0){ | |
171 | /* | |
172 | * PARENT: | |
173 | * save the context by waiting | |
174 | * until the child doing all of the work returns. | |
175 | * don't catch the interrupt | |
176 | */ | |
177 | signal(SIGINT, SIG_IGN); | |
178 | #ifdef TDEBUG | |
179 | msg("Tape: %d; parent process: %d child process %d\n", | |
180 | tapeno+1, parentpid, childpid); | |
181 | #endif TDEBUG | |
182 | for (;;){ | |
183 | waitpid = wait(&status); | |
184 | if (waitpid != childpid){ | |
185 | msg("Parent %d waiting for child %d has another child %d return\n", | |
186 | parentpid, childpid, waitpid); | |
187 | } else | |
188 | break; | |
189 | } | |
190 | if (status & 0xFF){ | |
191 | msg("Child %d returns LOB status %o\n", | |
192 | childpid, status&0xFF); | |
193 | } | |
194 | status = (status >> 8) & 0xFF; | |
195 | #ifdef TDEBUG | |
196 | switch(status){ | |
197 | case X_FINOK: | |
198 | msg("Child %d finishes X_FINOK\n", childpid); | |
199 | break; | |
200 | case X_ABORT: | |
201 | msg("Child %d finishes X_ABORT\n", childpid); | |
202 | break; | |
203 | case X_REWRITE: | |
204 | msg("Child %d finishes X_REWRITE\n", childpid); | |
205 | break; | |
206 | default: | |
207 | msg("Child %d finishes unknown %d\n", childpid,status); | |
208 | break; | |
209 | } | |
210 | #endif TDEBUG | |
211 | switch(status){ | |
212 | case X_FINOK: | |
213 | Exit(X_FINOK); | |
214 | case X_ABORT: | |
215 | Exit(X_ABORT); | |
216 | case X_REWRITE: | |
217 | goto restore_check_point; | |
218 | default: | |
219 | msg("Bad return code from dump: %d\n", status); | |
220 | Exit(X_ABORT); | |
221 | } | |
222 | /*NOTREACHED*/ | |
223 | } else { /* we are the child; just continue */ | |
224 | #ifdef TDEBUG | |
225 | sleep(4); /* allow time for parent's message to get out */ | |
226 | msg("Child on Tape %d has parent %d, my pid = %d\n", | |
227 | tapeno+1, parentpid, getpid()); | |
228 | #endif | |
229 | do{ | |
2a729b17 KM |
230 | if (pipeout) |
231 | to = 1; | |
232 | else | |
233 | to = creat(tape, 0666); | |
ae4b153c BJ |
234 | if (to < 0) { |
235 | if (!query("Cannot open tape. Do you want to retry the open?")) | |
236 | dumpabort(); | |
237 | } else break; | |
238 | } while (1); | |
239 | ||
240 | asize = 0; | |
241 | tapeno++; /* current tape sequence */ | |
242 | newtape++; /* new tape signal */ | |
243 | spcl.c_volume++; | |
244 | spcl.c_type = TS_TAPE; | |
245 | spclrec(); | |
246 | if (tapeno > 1) | |
247 | msg("Tape %d begins with blocks from ino %d\n", | |
248 | tapeno, ino); | |
249 | } | |
250 | } | |
251 | ||
252 | /* | |
253 | * The parent still catches interrupts, but does nothing with them | |
254 | */ | |
255 | sig_ign_parent() | |
256 | { | |
257 | msg("Waiting parent receives interrupt\n"); | |
258 | signal(SIGINT, sig_ign_parent); | |
259 | } | |
260 | ||
261 | dumpabort() | |
262 | { | |
ed7c701e | 263 | msg("The ENTIRE dump is aborted.\n"); |
ae4b153c BJ |
264 | Exit(X_ABORT); |
265 | } | |
266 | ||
267 | Exit(status) | |
268 | { | |
269 | #ifdef TDEBUG | |
270 | msg("pid = %d exits with status %d\n", getpid(), status); | |
271 | #endif TDEBUG | |
ed7c701e | 272 | exit(status); |
ae4b153c | 273 | } |