2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.16 1995-12-12 15:57:57 adam
8 * Implemented mf_unlink. cf_unlink uses mf_unlink.
10 * Revision 1.15 1995/12/08 16:21:14 adam
11 * Work on commit/update.
13 * Revision 1.14 1995/12/05 13:12:37 quinn
16 * Revision 1.13 1995/11/30 17:00:50 adam
17 * Several bug fixes. Commit system runs now.
19 * Revision 1.12 1995/11/24 17:26:11 quinn
20 * Mostly about making some ISAM stuff in the config file optional.
22 * Revision 1.11 1995/11/13 09:32:43 quinn
25 * Revision 1.10 1995/09/04 12:33:22 adam
26 * Various cleanup. YAZ util used instead.
28 * Revision 1.9 1994/11/04 14:26:39 quinn
31 * Revision 1.8 1994/10/05 16:56:42 quinn
34 * Revision 1.7 1994/09/19 14:12:37 quinn
37 * Revision 1.6 1994/09/14 13:10:15 quinn
38 * Corrected some bugs in the init-phase
40 * Revision 1.5 1994/09/12 08:01:51 quinn
43 * Revision 1.4 1994/09/01 14:51:07 quinn
44 * Allowed mf_write to write beyond eof+1.
46 * Revision 1.3 1994/08/24 09:37:17 quinn
47 * Changed reaction to read return values.
49 * Revision 1.2 1994/08/23 14:50:48 quinn
52 * Revision 1.1 1994/08/23 14:41:33 quinn
53 * First functional version.
59 * TODO: The size estimates in init may not be accurate due to
60 * only partially written final blocks.
63 #include <sys/types.h>
75 static MFile_area_struct *open_areas = 0;
76 static MFile_area_struct *default_area = 0;
78 static int scan_areadef(MFile_area ma, const char *name)
81 * If no definition is given, use current directory, unlimited.
83 const char *ad = res_get_def(common_resource, name, ".:-1b");
84 int offset = 0, rs, size, multi, rd;
85 char dirname[FILENAME_MAX+1], unit;
86 mf_dir **dp = &ma->dirs, *dir = *dp;
90 logf (LOG_FATAL, "Could not find resource '%s'", name);
95 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
100 logf (LOG_FATAL, "Illegal directory description: %s", ad + offset);
105 case 'B': case 'b': multi = 1; break;
106 case 'K': case 'k': multi = 1024; break;
107 case 'M': case 'm': multi = 1048576; break;
109 logf (LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
112 *dp = dir = xmalloc(sizeof(mf_dir));
114 strcpy(dir->name, dirname);
115 dir->max_bytes = dir->avail_bytes = size * multi;
122 static int file_position(MFile mf, int pos, int offset)
124 int off = 0, c = mf->cur_file, ps;
126 if ((c > 0 && pos <= mf->files[c-1].top) ||
127 (c < mf->no_files -1 && pos > mf->files[c].top))
130 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
132 off += mf->files[c].blocks;
135 assert(c < mf->no_files);
138 off = c ? (mf->files[c-1].top + 1) : 0;
139 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
140 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
142 if (!mf->wr && errno == ENOENT && off == 0)
144 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
147 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
150 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
157 static int cmp_part_file(const void *p1, const void *p2)
159 return ((part_file *)p1)->number - ((part_file *)p2)->number;
163 * Create a new area, cotaining metafiles in directories.
164 * Find the part-files in each directory, and inventory the existing metafiles.
166 MFile_area mf_init(const char *name)
168 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
171 part_file *part_f = 0;
175 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
177 logf (LOG_DEBUG, "mf_init(%s)", name);
178 for (mp = open_areas; mp; mp = mp->next)
179 if (!strcmp(name, mp->name))
181 ma = xmalloc(sizeof(MFile_area_struct));
182 strcpy(ma->name, name);
183 ma->next = open_areas;
187 if (scan_areadef(ma, name) < 0)
189 logf (LOG_FATAL, "Failed to access description of '%s'", name);
192 /* look at each directory */
193 for (dirp = ma->dirs; dirp; dirp = dirp->next)
195 if (!(dd = opendir(dirp->name)))
197 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
200 /* look at each file */
201 while ((dent = readdir(dd)))
203 if (*dent->d_name == '.')
205 if (sscanf(dent->d_name, "%[^.].mf.%d", metaname, &number) != 2)
207 logf (LOG_DEBUG, "bf: %s is not a part-file.", dent->d_name);
210 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
213 if (!strcmp(meta_f->name, metaname))
215 part_f = &meta_f->files[meta_f->no_files++];
222 meta_f = xmalloc(sizeof(*meta_f));
224 meta_f->next = ma->mfiles;
226 meta_f->cur_file = -1;
228 strcpy(meta_f->name, metaname);
229 part_f = &meta_f->files[0];
230 meta_f->no_files = 1;
232 part_f->number = number;
235 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
236 part_f->path = xstrdup(tmpnam);
238 if ((fd = open(part_f->path, O_RDONLY)) < 0)
240 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
244 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
246 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
251 if (dirp->max_bytes >= 0)
252 dirp->avail_bytes -= part_f->bytes;
256 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
258 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
260 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
268 * If !ma, Use MF_DEFAULT_AREA.
270 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
272 struct meta_file *new;
274 char tmp[FILENAME_MAX+1];
277 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
278 wflag ? "RW" : "RDONLY");
281 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
283 logf (LOG_FATAL, "Failed to open default area.");
288 for (new = ma->mfiles; new; new = new->next)
289 if (!strcmp(name, new->name))
296 new = xmalloc(sizeof(*new));
297 strcpy(new->name, name);
298 /* allocate one, empty file */
300 new->files[0].bytes = new->files[0].blocks = 0;
301 new->files[0].top = -1;
302 new->files[0].number = 0;
303 new->files[0].fd = -1;
304 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
305 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
306 new->min_bytes_creat; dp = dp->next);
309 logf (LOG_FATAL, "Insufficient space for new mfile.");
312 new->files[0].dir = dp;
313 sprintf(tmp, "%s/%s.mf.%d", dp->name, new->name, 0);
314 new->files[0].path = xstrdup(tmp);
319 for (i = 0; i < new->no_files; i++)
321 if (new->files[i].bytes % block_size)
322 new->files[i].bytes += block_size - new->files[i].bytes %
324 new->files[i].blocks = new->files[i].bytes / block_size;
328 new->blocksize = block_size;
329 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
334 for (i = 0; i < new->no_files; i++)
336 new->files[i].blocks = new->files[i].bytes / new->blocksize;
337 if (i == new->no_files)
338 new->files[i].top = -1;
340 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
341 : (new->files[i].blocks - 1);
349 int mf_close(MFile mf)
353 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
355 for (i = 0; i < mf->no_files; i++)
356 if (mf->files[i].fd >= 0)
358 close(mf->files[i].fd);
359 mf->files[i].fd = -1;
366 * Read one block from a metafile. Interface mirrors bfile.
368 int mf_read(MFile mf, int no, int offset, int num, void *buf)
372 if ((rd = file_position(mf, no, offset)) < 0)
377 toread = num ? num : mf->blocksize;
378 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
380 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
381 mf->files[mf->cur_file].path);
384 else if (rd < toread)
393 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
395 int ps, nblocks, towrite;
397 char tmp[FILENAME_MAX+1];
398 unsigned char dummych = '\xff';
400 if ((ps = file_position(mf, no, offset)) < 0)
402 /* file needs to grow */
403 while (ps >= mf->files[mf->cur_file].blocks)
405 logf (LOG_DEBUG, "File grows");
406 /* file overflow - allocate new file */
407 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
408 (ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
409 mf->files[mf->cur_file].dir->avail_bytes)
412 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
415 logf (LOG_DEBUG, "Capping off file %s at pos %d",
416 mf->files[mf->cur_file].path, nblocks);
417 if ((ps = file_position(mf,
418 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
419 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
421 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
423 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
426 mf->files[mf->cur_file].blocks += nblocks;
427 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
428 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
432 logf (LOG_DEBUG, "Creating new file.");
433 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
434 dp->avail_bytes < mf->min_bytes_creat; dp = dp->next);
437 logf (LOG_FATAL, "Cannot allocate more space for %s",
441 mf->files[mf->cur_file].top = (mf->cur_file ?
442 mf->files[mf->cur_file-1].top : -1) +
443 mf->files[mf->cur_file].blocks;
444 mf->files[++(mf->cur_file)].top = -1;
445 mf->files[mf->cur_file].dir = dp;
446 mf->files[mf->cur_file].number =
447 mf->files[mf->cur_file-1].number + 1;
448 mf->files[mf->cur_file].blocks =
449 mf->files[mf->cur_file].bytes = 0;
450 mf->files[mf->cur_file].fd = -1;
451 sprintf(tmp, "%s/%s.mf.%d", dp->name, mf->name,
452 mf->files[mf->cur_file].number);
453 mf->files[mf->cur_file].path = xstrdup(tmp);
455 /* open new file and position at beginning */
456 if ((ps = file_position(mf, no, offset)) < 0)
461 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
462 mf->files[mf->cur_file].blocks += nblocks;
463 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
464 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
465 mf->files[mf->cur_file].dir->avail_bytes -=
466 nblocks * mf->blocksize;
469 towrite = num ? num : mf->blocksize;
470 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
472 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
479 * Destroy a metafile, unlinking component files. File must be open.
481 int mf_unlink(MFile mf)
485 for (i = 0; i < mf->no_files; i++)
486 unlink (mf->files[i].path);
491 * Unlink the file by name, rather than MFile-handle. File should be closed.
493 int mf_unlink_name(MFile_area ma, const char *name)