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1 /*-
2  * ----------------------------------------------------------------------------
3  * "THE BEER-WARE LICENSE" (Revision 42):
4  * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
5  * can do whatever you want with this stuff. If we meet some day, and you think
6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
7  * ----------------------------------------------------------------------------
8  *
9  * $FreeBSD$
10  */
11 #include <sys/param.h>
12 #include <sys/queue.h>
13 #include <sys/disk.h>
14 #include <sys/stat.h>
15
16 #include <err.h>
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <signal.h>
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <time.h>
25 #include <unistd.h>
26
27 volatile sig_atomic_t aborting = 0;
28 static size_t bigsize = 1024 * 1024;
29 static size_t medsize;
30 static size_t minsize = 512;
31
32 struct lump {
33         off_t                   start;
34         off_t                   len;
35         int                     state;
36         TAILQ_ENTRY(lump)       list;
37 };
38
39 static TAILQ_HEAD(, lump) lumps = TAILQ_HEAD_INITIALIZER(lumps);
40
41 static void
42 new_lump(off_t start, off_t len, int state)
43 {
44         struct lump *lp;
45
46         lp = malloc(sizeof *lp);
47         if (lp == NULL)
48                 err(1, "Malloc failed");
49         lp->start = start;
50         lp->len = len;
51         lp->state = state;
52         TAILQ_INSERT_TAIL(&lumps, lp, list);
53 }
54
55 static struct lump *lp;
56 static char *wworklist = NULL;
57 static char *rworklist = NULL;
58
59
60 #define PRINT_HEADER \
61         printf("%13s %7s %13s %5s %13s %13s %9s\n", \
62                 "start", "size", "block-len", "state", "done", "remaining", "% done")
63
64 #define PRINT_STATUS(start, i, len, state, d, t) \
65         printf("\r%13jd %7zu %13jd %5d %13jd %13jd %9.5f", \
66                 (intmax_t)start, \
67                 i,  \
68                 (intmax_t)len, \
69                 state, \
70                 (intmax_t)d, \
71                 (intmax_t)(t - d), \
72                 100*(double)d/(double)t)
73
74 /* Save the worklist if -w was given */
75 static void
76 save_worklist(void)
77 {
78         FILE *file;
79         struct lump *llp;
80
81         if (wworklist != NULL) {
82                 (void)fprintf(stderr, "\nSaving worklist ...");
83                 fflush(stderr);
84
85                 file = fopen(wworklist, "w");
86                 if (file == NULL)
87                         err(1, "Error opening file %s", wworklist);
88
89                 TAILQ_FOREACH(llp, &lumps, list)
90                         fprintf(file, "%jd %jd %d\n",
91                             (intmax_t)llp->start, (intmax_t)llp->len,
92                             llp->state);
93                 fclose(file);
94                 (void)fprintf(stderr, " done.\n");
95         }
96 }
97
98 /* Read the worklist if -r was given */
99 static off_t
100 read_worklist(off_t t)
101 {
102         off_t s, l, d;
103         int state, lines;
104         FILE *file;
105
106         (void)fprintf(stderr, "Reading worklist ...");
107         fflush(stderr);
108         file = fopen(rworklist, "r");
109         if (file == NULL)
110                 err(1, "Error opening file %s", rworklist);
111
112         lines = 0;
113         d = t;
114         for (;;) {
115                 ++lines;
116                 if (3 != fscanf(file, "%jd %jd %d\n", &s, &l, &state)) {
117                         if (!feof(file))
118                                 err(1, "Error parsing file %s at line %d",
119                                     rworklist, lines);
120                         else
121                                 break;
122                 }
123                 new_lump(s, l, state);
124                 d -= l;
125         }
126         (void)fprintf(stderr, " done.\n");
127         /*
128          * Return the number of bytes already read
129          * (at least not in worklist).
130          */
131         return (d);
132 }
133
134 static void
135 usage(void)
136 {
137         (void)fprintf(stderr, "usage: recoverdisk [-b bigsize] [-r readlist] "
138             "[-s interval] [-w writelist] source [destination]\n");
139         exit(1);
140 }
141
142 static void
143 sighandler(__unused int sig)
144 {
145
146         aborting = 1;
147 }
148
149 int
150 main(int argc, char * const argv[])
151 {
152         int ch;
153         int fdr, fdw;
154         off_t t, d, start, len;
155         size_t i, j;
156         int error, state;
157         u_char *buf;
158         u_int sectorsize;
159         time_t t1, t2;
160         struct stat sb;
161         u_int n, snapshot = 60;
162
163         while ((ch = getopt(argc, argv, "b:r:w:s:")) != -1) {
164                 switch (ch) {
165                 case 'b':
166                         bigsize = strtoul(optarg, NULL, 0);
167                         break;
168                 case 'r':
169                         rworklist = strdup(optarg);
170                         if (rworklist == NULL)
171                                 err(1, "Cannot allocate enough memory");
172                         break;
173                 case 's':
174                         snapshot = strtoul(optarg, NULL, 0);
175                         break;
176                 case 'w':
177                         wworklist = strdup(optarg);
178                         if (wworklist == NULL)
179                                 err(1, "Cannot allocate enough memory");
180                         break;
181                 default:
182                         usage();
183                         /* NOTREACHED */
184                 }
185         }
186         argc -= optind;
187         argv += optind;
188
189         if (argc < 1 || argc > 2)
190                 usage();
191
192         fdr = open(argv[0], O_RDONLY);
193         if (fdr < 0)
194                 err(1, "Cannot open read descriptor %s", argv[0]);
195
196         error = fstat(fdr, &sb);
197         if (error < 0)
198                 err(1, "fstat failed");
199         if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
200                 error = ioctl(fdr, DIOCGSECTORSIZE, &sectorsize);
201                 if (error < 0)
202                         err(1, "DIOCGSECTORSIZE failed");
203
204                 minsize = sectorsize;
205                 bigsize = (bigsize / sectorsize) * sectorsize;
206
207                 error = ioctl(fdr, DIOCGMEDIASIZE, &t);
208                 if (error < 0)
209                         err(1, "DIOCGMEDIASIZE failed");
210         } else {
211                 t = sb.st_size;
212         }
213
214         if (bigsize < minsize)
215                 bigsize = minsize;
216
217         for (ch = 0; (bigsize >> ch) > minsize; ch++)
218                 continue;
219         medsize = bigsize >> (ch / 2);
220         medsize = (medsize / minsize) * minsize;
221
222         fprintf(stderr, "Bigsize = %zu, medsize = %zu, minsize = %zu\n",
223             bigsize, medsize, minsize);
224
225         buf = malloc(bigsize);
226         if (buf == NULL)
227                 err(1, "Cannot allocate %zu bytes buffer", bigsize);
228
229         if (argc > 1) {
230                 fdw = open(argv[1], O_WRONLY | O_CREAT, DEFFILEMODE);
231                 if (fdw < 0)
232                         err(1, "Cannot open write descriptor %s", argv[1]);
233                 if (ftruncate(fdw, t) < 0)
234                         err(1, "Cannot truncate output %s to %jd bytes",
235                             argv[1], (intmax_t)t);
236         } else
237                 fdw = -1;
238
239         if (rworklist != NULL) {
240                 d = read_worklist(t);
241         } else {
242                 new_lump(0, t, 0);
243                 d = 0;
244         }
245         if (wworklist != NULL)
246                 signal(SIGINT, sighandler);
247
248         t1 = 0;
249         start = len = i = state = 0;
250         PRINT_HEADER;
251         n = 0;
252         for (;;) {
253                 lp = TAILQ_FIRST(&lumps);
254                 if (lp == NULL)
255                         break;
256                 while (lp->len > 0 && !aborting) {
257                         /* These are only copied for printing stats */
258                         start = lp->start;
259                         len = lp->len;
260                         state = lp->state;
261
262                         i = MIN(lp->len, (off_t)bigsize);
263                         if (lp->state == 1)
264                                 i = MIN(lp->len, (off_t)medsize);
265                         if (lp->state > 1)
266                                 i = MIN(lp->len, (off_t)minsize);
267                         time(&t2);
268                         if (t1 != t2 || lp->len < (off_t)bigsize) {
269                                 PRINT_STATUS(start, i, len, state, d, t);
270                                 t1 = t2;
271                                 if (++n == snapshot) {
272                                         save_worklist();
273                                         n = 0;
274                                 }
275                         }
276                         if (i == 0) {
277                                 errx(1, "BOGUS i %10jd", (intmax_t)i);
278                         }
279                         fflush(stdout);
280                         j = pread(fdr, buf, i, lp->start);
281                         if (j == i) {
282                                 d += i;
283                                 if (fdw >= 0)
284                                         j = pwrite(fdw, buf, i, lp->start);
285                                 else
286                                         j = i;
287                                 if (j != i)
288                                         printf("\nWrite error at %jd/%zu\n",
289                                             lp->start, i);
290                                 lp->start += i;
291                                 lp->len -= i;
292                                 continue;
293                         }
294                         printf("\n%jd %zu failed (%s)\n",
295                             lp->start, i, strerror(errno));
296                         if (errno == EINVAL) {
297                                 printf("read() size too big? Try with -b 131072");
298                                 aborting = 1;
299                         }
300                         if (errno == ENXIO)
301                                 aborting = 1;
302                         new_lump(lp->start, i, lp->state + 1);
303                         lp->start += i;
304                         lp->len -= i;
305                 }
306                 if (aborting) {
307                         save_worklist();
308                         return (0);
309                 }
310                 TAILQ_REMOVE(&lumps, lp, list);
311                 free(lp);
312         }
313         PRINT_STATUS(start, i, len, state, d, t);
314         save_worklist();
315         printf("\nCompleted\n");
316         return (0);
317 }