2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.15 1995-12-08 16:21:14 adam
8 * Work on commit/update.
10 * Revision 1.14 1995/12/05 13:12:37 quinn
13 * Revision 1.13 1995/11/30 17:00:50 adam
14 * Several bug fixes. Commit system runs now.
16 * Revision 1.12 1995/11/24 17:26:11 quinn
17 * Mostly about making some ISAM stuff in the config file optional.
19 * Revision 1.11 1995/11/13 09:32:43 quinn
22 * Revision 1.10 1995/09/04 12:33:22 adam
23 * Various cleanup. YAZ util used instead.
25 * Revision 1.9 1994/11/04 14:26:39 quinn
28 * Revision 1.8 1994/10/05 16:56:42 quinn
31 * Revision 1.7 1994/09/19 14:12:37 quinn
34 * Revision 1.6 1994/09/14 13:10:15 quinn
35 * Corrected some bugs in the init-phase
37 * Revision 1.5 1994/09/12 08:01:51 quinn
40 * Revision 1.4 1994/09/01 14:51:07 quinn
41 * Allowed mf_write to write beyond eof+1.
43 * Revision 1.3 1994/08/24 09:37:17 quinn
44 * Changed reaction to read return values.
46 * Revision 1.2 1994/08/23 14:50:48 quinn
49 * Revision 1.1 1994/08/23 14:41:33 quinn
50 * First functional version.
56 * TODO: The size estimates in init may not be accurate due to
57 * only partially written final blocks.
60 #include <sys/types.h>
72 static MFile_area_struct *open_areas = 0;
73 static MFile_area_struct *default_area = 0;
75 static int scan_areadef(MFile_area ma, const char *name)
78 * If no definition is given, use current directory, unlimited.
80 const char *ad = res_get_def(common_resource, name, ".:-1b");
81 int offset = 0, rs, size, multi, rd;
82 char dirname[FILENAME_MAX+1], unit;
83 mf_dir **dp = &ma->dirs, *dir = *dp;
87 logf (LOG_FATAL, "Could not find resource '%s'", name);
92 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
97 logf (LOG_FATAL, "Illegal directory description: %s", ad + offset);
102 case 'B': case 'b': multi = 1; break;
103 case 'K': case 'k': multi = 1024; break;
104 case 'M': case 'm': multi = 1048576; break;
106 logf (LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
109 *dp = dir = xmalloc(sizeof(mf_dir));
111 strcpy(dir->name, dirname);
112 dir->max_bytes = dir->avail_bytes = size * multi;
119 static int file_position(MFile mf, int pos, int offset)
121 int off = 0, c = mf->cur_file, ps;
123 if ((c > 0 && pos <= mf->files[c-1].top) ||
124 (c < mf->no_files -1 && pos > mf->files[c].top))
127 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
129 off += mf->files[c].blocks;
132 assert(c < mf->no_files);
135 off = c ? (mf->files[c-1].top + 1) : 0;
136 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
137 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
139 if (!mf->wr && errno == ENOENT && off == 0)
141 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
144 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
147 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
154 static int cmp_part_file(const void *p1, const void *p2)
156 return ((part_file *)p1)->number - ((part_file *)p2)->number;
160 * Create a new area, cotaining metafiles in directories.
161 * Find the part-files in each directory, and inventory the existing metafiles.
163 MFile_area mf_init(const char *name)
165 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
168 part_file *part_f = 0;
172 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
174 logf (LOG_DEBUG, "mf_init(%s)", name);
175 for (mp = open_areas; mp; mp = mp->next)
176 if (!strcmp(name, mp->name))
178 ma = xmalloc(sizeof(MFile_area_struct));
179 strcpy(ma->name, name);
180 ma->next = open_areas;
184 if (scan_areadef(ma, name) < 0)
186 logf (LOG_FATAL, "Failed to access description of '%s'", name);
189 /* look at each directory */
190 for (dirp = ma->dirs; dirp; dirp = dirp->next)
192 if (!(dd = opendir(dirp->name)))
194 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
197 /* look at each file */
198 while ((dent = readdir(dd)))
200 if (*dent->d_name == '.')
202 if (sscanf(dent->d_name, "%[^.].mf.%d", metaname, &number) != 2)
204 logf (LOG_DEBUG, "bf: %s is not a part-file.", dent->d_name);
207 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
210 if (!strcmp(meta_f->name, metaname))
212 part_f = &meta_f->files[meta_f->no_files++];
219 meta_f = xmalloc(sizeof(*meta_f));
221 meta_f->next = ma->mfiles;
223 meta_f->cur_file = -1;
225 strcpy(meta_f->name, metaname);
226 part_f = &meta_f->files[0];
227 meta_f->no_files = 1;
229 part_f->number = number;
232 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
233 part_f->path = xstrdup(tmpnam);
235 if ((fd = open(part_f->path, O_RDONLY)) < 0)
237 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
241 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
243 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
248 if (dirp->max_bytes >= 0)
249 dirp->avail_bytes -= part_f->bytes;
253 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
255 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
257 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
265 * If !ma, Use MF_DEFAULT_AREA.
267 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
269 struct meta_file *new;
271 char tmp[FILENAME_MAX+1];
274 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
275 wflag ? "RW" : "RDONLY");
278 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
280 logf (LOG_FATAL, "Failed to open default area.");
285 for (new = ma->mfiles; new; new = new->next)
286 if (!strcmp(name, new->name))
293 new = xmalloc(sizeof(*new));
294 strcpy(new->name, name);
295 /* allocate one, empty file */
297 new->files[0].bytes = new->files[0].blocks = 0;
298 new->files[0].top = -1;
299 new->files[0].number = 0;
300 new->files[0].fd = -1;
301 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
302 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
303 new->min_bytes_creat; dp = dp->next);
306 logf (LOG_FATAL, "Insufficient space for new mfile.");
309 new->files[0].dir = dp;
310 sprintf(tmp, "%s/%s.mf.%d", dp->name, new->name, 0);
311 new->files[0].path = xstrdup(tmp);
316 for (i = 0; i < new->no_files; i++)
318 if (new->files[i].bytes % block_size)
319 new->files[i].bytes += block_size - new->files[i].bytes %
321 new->files[i].blocks = new->files[i].bytes / block_size;
325 new->blocksize = block_size;
326 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
331 for (i = 0; i < new->no_files; i++)
333 new->files[i].blocks = new->files[i].bytes / new->blocksize;
334 if (i == new->no_files)
335 new->files[i].top = -1;
337 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
338 : (new->files[i].blocks - 1);
346 int mf_close(MFile mf)
350 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
352 for (i = 0; i < mf->no_files; i++)
353 if (mf->files[i].fd >= 0)
355 close(mf->files[i].fd);
356 mf->files[i].fd = -1;
363 * Read one block from a metafile. Interface mirrors bfile.
365 int mf_read(MFile mf, int no, int offset, int num, void *buf)
369 if ((rd = file_position(mf, no, offset)) < 0)
374 toread = num ? num : mf->blocksize;
375 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
377 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
378 mf->files[mf->cur_file].path);
381 else if (rd < toread)
390 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
392 int ps, nblocks, towrite;
394 char tmp[FILENAME_MAX+1];
395 unsigned char dummych = '\xff';
397 if ((ps = file_position(mf, no, offset)) < 0)
399 /* file needs to grow */
400 while (ps >= mf->files[mf->cur_file].blocks)
402 logf (LOG_DEBUG, "File grows");
403 /* file overflow - allocate new file */
404 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
405 (ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
406 mf->files[mf->cur_file].dir->avail_bytes)
409 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
412 logf (LOG_DEBUG, "Capping off file %s at pos %d",
413 mf->files[mf->cur_file].path, nblocks);
414 if ((ps = file_position(mf,
415 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
416 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
418 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
420 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
423 mf->files[mf->cur_file].blocks += nblocks;
424 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
425 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
429 logf (LOG_DEBUG, "Creating new file.");
430 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
431 dp->avail_bytes < mf->min_bytes_creat; dp = dp->next);
434 logf (LOG_FATAL, "Cannot allocate more space for %s",
438 mf->files[mf->cur_file].top = (mf->cur_file ?
439 mf->files[mf->cur_file-1].top : -1) +
440 mf->files[mf->cur_file].blocks;
441 mf->files[++(mf->cur_file)].top = -1;
442 mf->files[mf->cur_file].dir = dp;
443 mf->files[mf->cur_file].number =
444 mf->files[mf->cur_file-1].number + 1;
445 mf->files[mf->cur_file].blocks =
446 mf->files[mf->cur_file].bytes = 0;
447 mf->files[mf->cur_file].fd = -1;
448 sprintf(tmp, "%s/%s.mf.%d", dp->name, mf->name,
449 mf->files[mf->cur_file].number);
450 mf->files[mf->cur_file].path = xstrdup(tmp);
452 /* open new file and position at beginning */
453 if ((ps = file_position(mf, no, offset)) < 0)
458 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
459 mf->files[mf->cur_file].blocks += nblocks;
460 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
461 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
462 mf->files[mf->cur_file].dir->avail_bytes -=
463 nblocks * mf->blocksize;
466 towrite = num ? num : mf->blocksize;
467 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
469 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
476 * Destroy a metafile, unlinking component files. File must be open.
478 int mf_unlink(MFile mf)
485 * Unlink the file by name, rather than MFile-handle. File should be closed.
487 int mf_unlink_name(MFile_area ma, const char *name)