2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.19 1996-05-01 07:16:30 quinn
10 * Revision 1.18 1996/04/09 06:47:30 adam
11 * Function scan_areadef doesn't use sscanf (%n fails on this Linux).
13 * Revision 1.17 1996/03/20 13:29:11 quinn
16 * Revision 1.16 1995/12/12 15:57:57 adam
17 * Implemented mf_unlink. cf_unlink uses mf_unlink.
19 * Revision 1.15 1995/12/08 16:21:14 adam
20 * Work on commit/update.
22 * Revision 1.14 1995/12/05 13:12:37 quinn
25 * Revision 1.13 1995/11/30 17:00:50 adam
26 * Several bug fixes. Commit system runs now.
28 * Revision 1.12 1995/11/24 17:26:11 quinn
29 * Mostly about making some ISAM stuff in the config file optional.
31 * Revision 1.11 1995/11/13 09:32:43 quinn
34 * Revision 1.10 1995/09/04 12:33:22 adam
35 * Various cleanup. YAZ util used instead.
37 * Revision 1.9 1994/11/04 14:26:39 quinn
40 * Revision 1.8 1994/10/05 16:56:42 quinn
43 * Revision 1.7 1994/09/19 14:12:37 quinn
46 * Revision 1.6 1994/09/14 13:10:15 quinn
47 * Corrected some bugs in the init-phase
49 * Revision 1.5 1994/09/12 08:01:51 quinn
52 * Revision 1.4 1994/09/01 14:51:07 quinn
53 * Allowed mf_write to write beyond eof+1.
55 * Revision 1.3 1994/08/24 09:37:17 quinn
56 * Changed reaction to read return values.
58 * Revision 1.2 1994/08/23 14:50:48 quinn
61 * Revision 1.1 1994/08/23 14:41:33 quinn
62 * First functional version.
68 * TODO: The size estimates in init may not be accurate due to
69 * only partially written final blocks.
72 #include <sys/types.h>
84 static MFile_area_struct *open_areas = 0;
85 static MFile_area_struct *default_area = 0;
87 static int scan_areadef(MFile_area ma, const char *name)
90 * If no definition is given, use current directory, unlimited.
92 const char *ad = res_get_def(common_resource, name, ".:-1b");
93 char dirname[FILENAME_MAX+1];
94 mf_dir **dp = &ma->dirs, *dir = *dp;
98 logf (LOG_FATAL, "Could not find resource '%s'", name);
103 const char *ad0 = ad;
104 int i = 0, fact = 1, multi, size = 0;
106 while (*ad == ' ' || *ad == '\t')
110 while (*ad && *ad != ':')
112 if (i < FILENAME_MAX)
119 logf (LOG_FATAL, "Missing colon after path: %s", ad0);
124 logf (LOG_FATAL, "Empty path: %s", ad0);
127 while (*ad == ' ' || *ad == '\t')
137 if (*ad <= '0' || *ad >= '9')
139 logf (LOG_FATAL, "Missing size after path: %s", ad0);
143 while (*ad >= '0' && *ad <= '9')
144 size = size*10 + (*ad++ - '0');
147 case 'B': case 'b': multi = 1; break;
148 case 'K': case 'k': multi = 1024; break;
149 case 'M': case 'm': multi = 1048576; break;
151 logf (LOG_FATAL, "Missing unit: %s", ad0);
154 logf (LOG_FATAL, "Illegal unit: %c in %s", *ad, ad0);
158 *dp = dir = xmalloc(sizeof(mf_dir));
160 strcpy(dir->name, dirname);
161 dir->max_bytes = dir->avail_bytes = fact * size * multi;
167 static int file_position(MFile mf, int pos, int offset)
169 int off = 0, c = mf->cur_file, ps;
171 if ((c > 0 && pos <= mf->files[c-1].top) ||
172 (c < mf->no_files -1 && pos > mf->files[c].top))
175 while (c + 1 < mf->no_files && mf->files[c].top < pos)
177 off += mf->files[c].blocks;
180 assert(c < mf->no_files);
183 off = c ? (mf->files[c-1].top + 1) : 0;
184 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
185 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
187 if (!mf->wr && errno == ENOENT && off == 0)
189 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
192 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
195 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
202 static int cmp_part_file(const void *p1, const void *p2)
204 return ((part_file *)p1)->number - ((part_file *)p2)->number;
208 * Create a new area, cotaining metafiles in directories.
209 * Find the part-files in each directory, and inventory the existing metafiles.
211 MFile_area mf_init(const char *name)
213 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
216 part_file *part_f = 0;
220 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
222 logf (LOG_DEBUG, "mf_init(%s)", name);
223 for (mp = open_areas; mp; mp = mp->next)
224 if (!strcmp(name, mp->name))
226 ma = xmalloc(sizeof(MFile_area_struct));
227 strcpy(ma->name, name);
228 ma->next = open_areas;
232 if (scan_areadef(ma, name) < 0)
234 logf (LOG_FATAL, "Failed to access description of '%s'", name);
237 /* look at each directory */
238 for (dirp = ma->dirs; dirp; dirp = dirp->next)
240 if (!(dd = opendir(dirp->name)))
242 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
245 /* look at each file */
246 while ((dent = readdir(dd)))
248 if (*dent->d_name == '.')
250 if (sscanf(dent->d_name, "%[^.].mf.%d", metaname, &number) != 2)
252 logf (LOG_DEBUG, "bf: %s is not a part-file.", dent->d_name);
255 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
258 if (!strcmp(meta_f->name, metaname))
260 part_f = &meta_f->files[meta_f->no_files++];
267 meta_f = xmalloc(sizeof(*meta_f));
269 meta_f->next = ma->mfiles;
271 meta_f->cur_file = -1;
273 strcpy(meta_f->name, metaname);
274 part_f = &meta_f->files[0];
275 meta_f->no_files = 1;
277 part_f->number = number;
280 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
281 part_f->path = xstrdup(tmpnam);
283 if ((fd = open(part_f->path, O_RDONLY)) < 0)
285 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
289 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
291 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
296 if (dirp->max_bytes >= 0)
297 dirp->avail_bytes -= part_f->bytes;
301 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
303 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
305 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
313 * If !ma, Use MF_DEFAULT_AREA.
315 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
317 struct meta_file *new;
319 char tmp[FILENAME_MAX+1];
322 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
323 wflag ? "RW" : "RDONLY");
326 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
328 logf (LOG_FATAL, "Failed to open default area.");
333 for (new = ma->mfiles; new; new = new->next)
334 if (!strcmp(name, new->name))
341 new = xmalloc(sizeof(*new));
342 strcpy(new->name, name);
343 /* allocate one, empty file */
345 new->files[0].bytes = new->files[0].blocks = 0;
346 new->files[0].top = -1;
347 new->files[0].number = 0;
348 new->files[0].fd = -1;
349 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
350 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
351 new->min_bytes_creat; dp = dp->next);
354 logf (LOG_FATAL, "Insufficient space for new mfile.");
357 new->files[0].dir = dp;
358 sprintf(tmp, "%s/%s.mf.%d", dp->name, new->name, 0);
359 new->files[0].path = xstrdup(tmp);
364 for (i = 0; i < new->no_files; i++)
366 if (new->files[i].bytes % block_size)
367 new->files[i].bytes += block_size - new->files[i].bytes %
369 new->files[i].blocks = new->files[i].bytes / block_size;
373 new->blocksize = block_size;
374 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
379 for (i = 0; i < new->no_files; i++)
381 new->files[i].blocks = new->files[i].bytes / new->blocksize;
382 if (i == new->no_files - 1)
383 new->files[i].top = -1;
385 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
386 : (new->files[i].blocks - 1);
394 int mf_close(MFile mf)
398 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
400 for (i = 0; i < mf->no_files; i++)
401 if (mf->files[i].fd >= 0)
403 close(mf->files[i].fd);
404 mf->files[i].fd = -1;
411 * Read one block from a metafile. Interface mirrors bfile.
413 int mf_read(MFile mf, int no, int offset, int num, void *buf)
417 if ((rd = file_position(mf, no, offset)) < 0)
422 toread = num ? num : mf->blocksize;
423 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
425 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
426 mf->files[mf->cur_file].path);
429 else if (rd < toread)
438 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
440 int ps, nblocks, towrite;
442 char tmp[FILENAME_MAX+1];
443 unsigned char dummych = '\xff';
445 if ((ps = file_position(mf, no, offset)) < 0)
447 /* file needs to grow */
448 while (ps >= mf->files[mf->cur_file].blocks)
450 /* file overflow - allocate new file */
451 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
452 (ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
453 mf->files[mf->cur_file].dir->avail_bytes)
456 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
459 logf (LOG_DEBUG, "Capping off file %s at pos %d",
460 mf->files[mf->cur_file].path, nblocks);
461 if ((ps = file_position(mf,
462 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
463 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
465 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
467 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
470 mf->files[mf->cur_file].blocks += nblocks;
471 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
472 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
476 logf (LOG_DEBUG, "Creating new file.");
477 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
478 dp->avail_bytes < mf->min_bytes_creat; dp = dp->next);
481 logf (LOG_FATAL, "Cannot allocate more space for %s",
485 mf->files[mf->cur_file].top = (mf->cur_file ?
486 mf->files[mf->cur_file-1].top : -1) +
487 mf->files[mf->cur_file].blocks;
488 mf->files[++(mf->cur_file)].top = -1;
489 mf->files[mf->cur_file].dir = dp;
490 mf->files[mf->cur_file].number =
491 mf->files[mf->cur_file-1].number + 1;
492 mf->files[mf->cur_file].blocks =
493 mf->files[mf->cur_file].bytes = 0;
494 mf->files[mf->cur_file].fd = -1;
495 sprintf(tmp, "%s/%s.mf.%d", dp->name, mf->name,
496 mf->files[mf->cur_file].number);
497 mf->files[mf->cur_file].path = xstrdup(tmp);
499 /* open new file and position at beginning */
500 if ((ps = file_position(mf, no, offset)) < 0)
505 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
506 mf->files[mf->cur_file].blocks += nblocks;
507 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
508 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
509 mf->files[mf->cur_file].dir->avail_bytes -=
510 nblocks * mf->blocksize;
513 towrite = num ? num : mf->blocksize;
514 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
516 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
523 * Destroy a metafile, unlinking component files. File must be open.
525 int mf_unlink(MFile mf)
529 for (i = 0; i < mf->no_files; i++)
530 unlink (mf->files[i].path);
535 * Unlink the file by name, rather than MFile-handle. File should be closed.
537 int mf_unlink_name(MFile_area ma, const char *name)