2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.13 1995-11-30 17:00:50 adam
8 * Several bug fixes. Commit system runs now.
10 * Revision 1.12 1995/11/24 17:26:11 quinn
11 * Mostly about making some ISAM stuff in the config file optional.
13 * Revision 1.11 1995/11/13 09:32:43 quinn
16 * Revision 1.10 1995/09/04 12:33:22 adam
17 * Various cleanup. YAZ util used instead.
19 * Revision 1.9 1994/11/04 14:26:39 quinn
22 * Revision 1.8 1994/10/05 16:56:42 quinn
25 * Revision 1.7 1994/09/19 14:12:37 quinn
28 * Revision 1.6 1994/09/14 13:10:15 quinn
29 * Corrected some bugs in the init-phase
31 * Revision 1.5 1994/09/12 08:01:51 quinn
34 * Revision 1.4 1994/09/01 14:51:07 quinn
35 * Allowed mf_write to write beyond eof+1.
37 * Revision 1.3 1994/08/24 09:37:17 quinn
38 * Changed reaction to read return values.
40 * Revision 1.2 1994/08/23 14:50:48 quinn
43 * Revision 1.1 1994/08/23 14:41:33 quinn
44 * First functional version.
50 * TODO: The size estimates in init may not be accurate due to
51 * only partially written final blocks.
54 #include <sys/types.h>
65 static MFile_area_struct *open_areas = 0;
66 static MFile_area_struct *default_area = 0;
68 static int scan_areadef(MFile_area ma, const char *name)
71 * If no definition is given, use current directory, unlimited.
73 const char *ad = res_get_def(common_resource, name, ".:-1b");
74 int offset = 0, rs, size, multi, rd;
75 char dirname[FILENAME_MAX+1], unit;
76 mf_dir **dp = &ma->dirs, *dir = *dp;
80 logf (LOG_FATAL, "Could not find resource '%s'", name);
85 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
90 logf (LOG_FATAL, "Illegal directory description: %s", ad + offset);
95 case 'B': case 'b': multi = 1; break;
96 case 'K': case 'k': multi = 1024; break;
97 case 'M': case 'm': multi = 1048576; break;
99 logf (LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
102 *dp = dir = xmalloc(sizeof(mf_dir));
104 strcpy(dir->name, dirname);
105 dir->max_bytes = dir->avail_bytes = size * multi;
112 static int file_position(MFile mf, int pos, int offset)
114 int off = 0, c = mf->cur_file, ps;
116 if ((c > 0 && pos <= mf->files[c-1].top) ||
117 (c < mf->no_files -1 && pos > mf->files[c].top))
120 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
122 off += mf->files[c].blocks;
125 assert(c < mf->no_files);
128 off = c ? (mf->files[c-1].top + 1) : 0;
129 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
130 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
132 if (!mf->wr && errno == ENOENT && off == 0)
134 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
137 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
140 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
147 static int cmp_part_file(const void *p1, const void *p2)
149 return ((part_file *)p1)->number - ((part_file *)p2)->number;
153 * Create a new area, cotaining metafiles in directories.
154 * Find the part-files in each directory, and inventory the existing metafiles.
156 MFile_area mf_init(const char *name)
158 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
161 part_file *part_f = 0;
165 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
167 logf (LOG_DEBUG, "mf_init(%s)", name);
168 for (mp = open_areas; mp; mp = mp->next)
169 if (!strcmp(name, mp->name))
171 strcpy(ma->name, name);
172 ma->next = open_areas;
176 if (scan_areadef(ma, name) < 0)
178 logf (LOG_FATAL, "Failed to access description of '%s'", name);
181 /* look at each directory */
182 for (dirp = ma->dirs; dirp; dirp = dirp->next)
184 if (!(dd = opendir(dirp->name)))
186 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
189 /* look at each file */
190 while ((dent = readdir(dd)))
192 if (*dent->d_name == '.')
194 if (sscanf(dent->d_name, "%[^.].mf.%d", metaname, &number) != 2)
196 logf (LOG_DEBUG, "bf: %s is not a part-file.", dent->d_name);
199 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
202 if (!strcmp(meta_f->name, metaname))
204 part_f = &meta_f->files[meta_f->no_files++];
211 meta_f = xmalloc(sizeof(*meta_f));
213 meta_f->next = ma->mfiles;
215 meta_f->cur_file = -1;
217 strcpy(meta_f->name, metaname);
218 part_f = &meta_f->files[0];
219 meta_f->no_files = 1;
221 part_f->number = number;
224 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
225 part_f->path = xstrdup(tmpnam);
227 if ((fd = open(part_f->path, O_RDONLY)) < 0)
229 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
233 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
235 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
240 if (dirp->max_bytes >= 0)
241 dirp->avail_bytes -= part_f->bytes;
245 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
247 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
249 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
257 * If !ma, Use MF_DEFAULT_AREA.
259 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
261 struct meta_file *new;
263 char tmp[FILENAME_MAX+1];
266 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
267 wflag ? "RW" : "RDONLY");
270 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
272 logf (LOG_FATAL, "Failed to open default area.");
277 for (new = ma->mfiles; new; new = new->next)
278 if (!strcmp(name, new->name))
285 new = xmalloc(sizeof(*new));
286 strcpy(new->name, name);
287 /* allocate one, empty file */
289 new->files[0].bytes = new->files[0].blocks = 0;
290 new->files[0].top = -1;
291 new->files[0].number = 0;
292 new->files[0].fd = -1;
293 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
294 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
295 new->min_bytes_creat; dp = dp->next);
298 logf (LOG_FATAL, "Insufficient space for new mfile.");
301 new->files[0].dir = dp;
302 sprintf(tmp, "%s/%s.mf.%d", dp->name, new->name, 0);
303 new->files[0].path = xstrdup(tmp);
308 for (i = 0; i < new->no_files; i++)
310 if (new->files[i].bytes % block_size)
311 new->files[i].bytes += block_size - new->files[i].bytes %
313 new->files[i].blocks = new->files[i].bytes / block_size;
317 new->blocksize = block_size;
318 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
323 for (i = 0; i < new->no_files; i++)
325 new->files[i].blocks = new->files[i].bytes / new->blocksize;
326 if (i == new->no_files)
327 new->files[i].top = -1;
329 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
330 : (new->files[i].blocks - 1);
338 int mf_close(MFile mf)
342 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
344 for (i = 0; i < mf->no_files; i++)
345 if (mf->files[i].fd >= 0)
347 close(mf->files[i].fd);
348 mf->files[i].fd = -1;
355 * Read one block from a metafile. Interface mirrors bfile.
357 int mf_read(MFile mf, int no, int offset, int num, void *buf)
361 if ((rd = file_position(mf, no, offset)) < 0)
366 toread = num ? num : mf->blocksize;
367 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
369 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
370 mf->files[mf->cur_file].path);
373 else if (rd < toread)
382 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
384 int ps, nblocks, towrite;
386 char tmp[FILENAME_MAX+1];
387 unsigned char dummych = '\xff';
389 if ((ps = file_position(mf, no, offset)) < 0)
391 /* file needs to grow */
392 while (ps >= mf->files[mf->cur_file].blocks)
394 logf (LOG_DEBUG, "File grows");
395 /* file overflow - allocate new file */
396 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
397 (ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
398 mf->files[mf->cur_file].dir->avail_bytes)
401 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
404 logf (LOG_DEBUG, "Capping off file %s at pos %d",
405 mf->files[mf->cur_file].path, nblocks);
406 if ((ps = file_position(mf,
407 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
408 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
410 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
412 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
415 mf->files[mf->cur_file].blocks += nblocks;
416 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
417 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
421 logf (LOG_DEBUG, "Creating new file.");
422 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
423 dp->avail_bytes < mf->min_bytes_creat; dp = dp->next);
426 logf (LOG_FATAL, "Cannot allocate more space for %s",
430 mf->files[mf->cur_file].top = (mf->cur_file ?
431 mf->files[mf->cur_file-1].top : -1) +
432 mf->files[mf->cur_file].blocks;
433 mf->files[++(mf->cur_file)].top = -1;
434 mf->files[mf->cur_file].dir = dp;
435 mf->files[mf->cur_file].number =
436 mf->files[mf->cur_file-1].number + 1;
437 mf->files[mf->cur_file].blocks =
438 mf->files[mf->cur_file].bytes = 0;
439 mf->files[mf->cur_file].fd = -1;
440 sprintf(tmp, "%s/%s.mf.%d", dp->name, mf->name,
441 mf->files[mf->cur_file].number);
442 mf->files[mf->cur_file].path = xstrdup(tmp);
444 /* open new file and position at beginning */
445 if ((ps = file_position(mf, no, offset)) < 0)
450 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
451 mf->files[mf->cur_file].blocks += nblocks;
452 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
453 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
454 mf->files[mf->cur_file].dir->avail_bytes -=
455 nblocks * mf->blocksize;
458 towrite = num ? num : mf->blocksize;
459 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
461 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
468 * Destroy a metafile, unlinking component files. File must be open.
470 int mf_unlink(MFile mf)
477 * Unlink the file by name, rather than MFile-handle. File should be closed.
479 int mf_unlink_name(MFile_area ma, const char *name)