Commit | Line | Data |
---|---|---|
be3f486f | 1 | static char *sccsid = "@(#)tape.c 1.3 (Berkeley) %G%"; |
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) ){ | |
60 | msg("Tape write error on tape %d\n", tapeno); | |
61 | broadcast("TAPE ERROR!\n"); | |
62 | if (query("Do you want to restart?")){ | |
63 | msg("This tape will rewind. After it is rewound,\n"); | |
64 | msg("replace the faulty tape with a new one;\n"); | |
ed7c701e | 65 | msg("this dump volume will be rewritten.\n"); |
ae4b153c BJ |
66 | /* |
67 | * Temporarily change the tapeno identification | |
68 | */ | |
69 | tapeno--; | |
70 | nogripe = 1; | |
71 | close_rewind(); | |
72 | nogripe = 0; | |
73 | tapeno++; | |
74 | Exit(X_REWRITE); | |
75 | } else { | |
76 | dumpabort(); | |
77 | /*NOTREACHED*/ | |
78 | } | |
79 | } | |
80 | ||
81 | asize += sizeof(tblock)/density; | |
82 | asize += 7; | |
83 | blockswritten += NTREC; | |
84 | if (asize > tsize) { | |
85 | close_rewind(); | |
86 | otape(); | |
87 | } | |
88 | timeest(); | |
89 | } | |
90 | ||
91 | rewind() | |
92 | { | |
93 | int secs; | |
be3f486f | 94 | int f; |
ae4b153c BJ |
95 | #ifdef DEBUG |
96 | msg("Waiting 10 seconds to rewind.\n"); | |
97 | sleep(10); | |
98 | #else | |
99 | /* | |
100 | * It takes about 3 minutes, 25secs to rewind 2300' of tape | |
101 | */ | |
be3f486f BJ |
102 | msg("Tape rewinding\n", secs); |
103 | close(to); | |
104 | while ((f = open(tape, 0)) < 0) | |
105 | sleep (10); | |
106 | close(f); | |
ae4b153c BJ |
107 | #endif |
108 | } | |
109 | ||
110 | close_rewind() | |
111 | { | |
112 | close(to); | |
113 | if (!nogripe){ | |
114 | rewind(); | |
115 | msg("Change Tapes: Mount tape #%d\n", tapeno+1); | |
116 | broadcast("CHANGE TAPES!\7\7\n"); | |
117 | } | |
118 | do{ | |
119 | if (query ("Is the new tape mounted and ready to go?")) | |
120 | break; | |
121 | if (query ("Do you want to abort?")){ | |
122 | dumpabort(); | |
123 | /*NOTREACHED*/ | |
124 | } | |
125 | } while (1); | |
126 | } | |
127 | ||
128 | /* | |
129 | * We implement taking and restoring checkpoints on | |
130 | * the tape level. | |
131 | * When each tape is opened, a new process is created by forking; this | |
132 | * saves all of the necessary context in the parent. The child | |
133 | * continues the dump; the parent waits around, saving the context. | |
134 | * If the child returns X_REWRITE, then it had problems writing that tape; | |
135 | * this causes the parent to fork again, duplicating the context, and | |
136 | * everything continues as if nothing had happened. | |
137 | */ | |
138 | ||
139 | otape() | |
140 | { | |
141 | int parentpid; | |
142 | int childpid; | |
143 | int status; | |
144 | int waitpid; | |
145 | int sig_ign_parent(); | |
146 | int interrupt(); | |
147 | ||
148 | /* | |
149 | * Force the tape to be closed | |
150 | */ | |
151 | close(to); | |
152 | parentpid = getpid(); | |
153 | ||
154 | restore_check_point: | |
155 | signal(SIGINT, interrupt); | |
156 | /* | |
157 | * All signals are inherited... | |
158 | */ | |
159 | childpid = fork(); | |
160 | if (childpid < 0){ | |
161 | msg("Context save fork fails in parent %d\n", parentpid); | |
162 | Exit(X_ABORT); | |
163 | } | |
164 | if (childpid != 0){ | |
165 | /* | |
166 | * PARENT: | |
167 | * save the context by waiting | |
168 | * until the child doing all of the work returns. | |
169 | * don't catch the interrupt | |
170 | */ | |
171 | signal(SIGINT, SIG_IGN); | |
172 | #ifdef TDEBUG | |
173 | msg("Tape: %d; parent process: %d child process %d\n", | |
174 | tapeno+1, parentpid, childpid); | |
175 | #endif TDEBUG | |
176 | for (;;){ | |
177 | waitpid = wait(&status); | |
178 | if (waitpid != childpid){ | |
179 | msg("Parent %d waiting for child %d has another child %d return\n", | |
180 | parentpid, childpid, waitpid); | |
181 | } else | |
182 | break; | |
183 | } | |
184 | if (status & 0xFF){ | |
185 | msg("Child %d returns LOB status %o\n", | |
186 | childpid, status&0xFF); | |
187 | } | |
188 | status = (status >> 8) & 0xFF; | |
189 | #ifdef TDEBUG | |
190 | switch(status){ | |
191 | case X_FINOK: | |
192 | msg("Child %d finishes X_FINOK\n", childpid); | |
193 | break; | |
194 | case X_ABORT: | |
195 | msg("Child %d finishes X_ABORT\n", childpid); | |
196 | break; | |
197 | case X_REWRITE: | |
198 | msg("Child %d finishes X_REWRITE\n", childpid); | |
199 | break; | |
200 | default: | |
201 | msg("Child %d finishes unknown %d\n", childpid,status); | |
202 | break; | |
203 | } | |
204 | #endif TDEBUG | |
205 | switch(status){ | |
206 | case X_FINOK: | |
207 | Exit(X_FINOK); | |
208 | case X_ABORT: | |
209 | Exit(X_ABORT); | |
210 | case X_REWRITE: | |
211 | goto restore_check_point; | |
212 | default: | |
213 | msg("Bad return code from dump: %d\n", status); | |
214 | Exit(X_ABORT); | |
215 | } | |
216 | /*NOTREACHED*/ | |
217 | } else { /* we are the child; just continue */ | |
218 | #ifdef TDEBUG | |
219 | sleep(4); /* allow time for parent's message to get out */ | |
220 | msg("Child on Tape %d has parent %d, my pid = %d\n", | |
221 | tapeno+1, parentpid, getpid()); | |
222 | #endif | |
223 | do{ | |
224 | to = creat(tape, 0666); | |
225 | if (to < 0) { | |
226 | if (!query("Cannot open tape. Do you want to retry the open?")) | |
227 | dumpabort(); | |
228 | } else break; | |
229 | } while (1); | |
230 | ||
231 | asize = 0; | |
232 | tapeno++; /* current tape sequence */ | |
233 | newtape++; /* new tape signal */ | |
234 | spcl.c_volume++; | |
235 | spcl.c_type = TS_TAPE; | |
236 | spclrec(); | |
237 | if (tapeno > 1) | |
238 | msg("Tape %d begins with blocks from ino %d\n", | |
239 | tapeno, ino); | |
240 | } | |
241 | } | |
242 | ||
243 | /* | |
244 | * The parent still catches interrupts, but does nothing with them | |
245 | */ | |
246 | sig_ign_parent() | |
247 | { | |
248 | msg("Waiting parent receives interrupt\n"); | |
249 | signal(SIGINT, sig_ign_parent); | |
250 | } | |
251 | ||
252 | dumpabort() | |
253 | { | |
ed7c701e | 254 | msg("The ENTIRE dump is aborted.\n"); |
ae4b153c BJ |
255 | Exit(X_ABORT); |
256 | } | |
257 | ||
258 | Exit(status) | |
259 | { | |
260 | #ifdef TDEBUG | |
261 | msg("pid = %d exits with status %d\n", getpid(), status); | |
262 | #endif TDEBUG | |
ed7c701e | 263 | exit(status); |
ae4b153c | 264 | } |