2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.14 1995-12-05 13:12:37 quinn
10 * Revision 1.13 1995/11/30 17:00:50 adam
11 * Several bug fixes. Commit system runs now.
13 * Revision 1.12 1995/11/24 17:26:11 quinn
14 * Mostly about making some ISAM stuff in the config file optional.
16 * Revision 1.11 1995/11/13 09:32:43 quinn
19 * Revision 1.10 1995/09/04 12:33:22 adam
20 * Various cleanup. YAZ util used instead.
22 * Revision 1.9 1994/11/04 14:26:39 quinn
25 * Revision 1.8 1994/10/05 16:56:42 quinn
28 * Revision 1.7 1994/09/19 14:12:37 quinn
31 * Revision 1.6 1994/09/14 13:10:15 quinn
32 * Corrected some bugs in the init-phase
34 * Revision 1.5 1994/09/12 08:01:51 quinn
37 * Revision 1.4 1994/09/01 14:51:07 quinn
38 * Allowed mf_write to write beyond eof+1.
40 * Revision 1.3 1994/08/24 09:37:17 quinn
41 * Changed reaction to read return values.
43 * Revision 1.2 1994/08/23 14:50:48 quinn
46 * Revision 1.1 1994/08/23 14:41:33 quinn
47 * First functional version.
53 * TODO: The size estimates in init may not be accurate due to
54 * only partially written final blocks.
57 #include <sys/types.h>
69 static MFile_area_struct *open_areas = 0;
70 static MFile_area_struct *default_area = 0;
72 static int scan_areadef(MFile_area ma, const char *name)
75 * If no definition is given, use current directory, unlimited.
77 const char *ad = res_get_def(common_resource, name, ".:-1b");
78 int offset = 0, rs, size, multi, rd;
79 char dirname[FILENAME_MAX+1], unit;
80 mf_dir **dp = &ma->dirs, *dir = *dp;
84 logf (LOG_FATAL, "Could not find resource '%s'", name);
89 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
94 logf (LOG_FATAL, "Illegal directory description: %s", ad + offset);
99 case 'B': case 'b': multi = 1; break;
100 case 'K': case 'k': multi = 1024; break;
101 case 'M': case 'm': multi = 1048576; break;
103 logf (LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
106 *dp = dir = xmalloc(sizeof(mf_dir));
108 strcpy(dir->name, dirname);
109 dir->max_bytes = dir->avail_bytes = size * multi;
116 static int file_position(MFile mf, int pos, int offset)
118 int off = 0, c = mf->cur_file, ps;
120 if ((c > 0 && pos <= mf->files[c-1].top) ||
121 (c < mf->no_files -1 && pos > mf->files[c].top))
124 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
126 off += mf->files[c].blocks;
129 assert(c < mf->no_files);
132 off = c ? (mf->files[c-1].top + 1) : 0;
133 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
134 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
136 if (!mf->wr && errno == ENOENT && off == 0)
138 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
141 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
144 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
151 static int cmp_part_file(const void *p1, const void *p2)
153 return ((part_file *)p1)->number - ((part_file *)p2)->number;
157 * Create a new area, cotaining metafiles in directories.
158 * Find the part-files in each directory, and inventory the existing metafiles.
160 MFile_area mf_init(const char *name)
162 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
165 part_file *part_f = 0;
169 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
171 logf (LOG_DEBUG, "mf_init(%s)", name);
172 for (mp = open_areas; mp; mp = mp->next)
173 if (!strcmp(name, mp->name))
175 strcpy(ma->name, name);
176 ma->next = open_areas;
180 if (scan_areadef(ma, name) < 0)
182 logf (LOG_FATAL, "Failed to access description of '%s'", name);
185 /* look at each directory */
186 for (dirp = ma->dirs; dirp; dirp = dirp->next)
188 if (!(dd = opendir(dirp->name)))
190 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
193 /* look at each file */
194 while ((dent = readdir(dd)))
196 if (*dent->d_name == '.')
198 if (sscanf(dent->d_name, "%[^.].mf.%d", metaname, &number) != 2)
200 logf (LOG_DEBUG, "bf: %s is not a part-file.", dent->d_name);
203 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
206 if (!strcmp(meta_f->name, metaname))
208 part_f = &meta_f->files[meta_f->no_files++];
215 meta_f = xmalloc(sizeof(*meta_f));
217 meta_f->next = ma->mfiles;
219 meta_f->cur_file = -1;
221 strcpy(meta_f->name, metaname);
222 part_f = &meta_f->files[0];
223 meta_f->no_files = 1;
225 part_f->number = number;
228 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
229 part_f->path = xstrdup(tmpnam);
231 if ((fd = open(part_f->path, O_RDONLY)) < 0)
233 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
237 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
239 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
244 if (dirp->max_bytes >= 0)
245 dirp->avail_bytes -= part_f->bytes;
249 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
251 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
253 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
261 * If !ma, Use MF_DEFAULT_AREA.
263 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
265 struct meta_file *new;
267 char tmp[FILENAME_MAX+1];
270 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
271 wflag ? "RW" : "RDONLY");
274 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
276 logf (LOG_FATAL, "Failed to open default area.");
281 for (new = ma->mfiles; new; new = new->next)
282 if (!strcmp(name, new->name))
289 new = xmalloc(sizeof(*new));
290 strcpy(new->name, name);
291 /* allocate one, empty file */
293 new->files[0].bytes = new->files[0].blocks = 0;
294 new->files[0].top = -1;
295 new->files[0].number = 0;
296 new->files[0].fd = -1;
297 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
298 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
299 new->min_bytes_creat; dp = dp->next);
302 logf (LOG_FATAL, "Insufficient space for new mfile.");
305 new->files[0].dir = dp;
306 sprintf(tmp, "%s/%s.mf.%d", dp->name, new->name, 0);
307 new->files[0].path = xstrdup(tmp);
312 for (i = 0; i < new->no_files; i++)
314 if (new->files[i].bytes % block_size)
315 new->files[i].bytes += block_size - new->files[i].bytes %
317 new->files[i].blocks = new->files[i].bytes / block_size;
321 new->blocksize = block_size;
322 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
327 for (i = 0; i < new->no_files; i++)
329 new->files[i].blocks = new->files[i].bytes / new->blocksize;
330 if (i == new->no_files)
331 new->files[i].top = -1;
333 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
334 : (new->files[i].blocks - 1);
342 int mf_close(MFile mf)
346 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
348 for (i = 0; i < mf->no_files; i++)
349 if (mf->files[i].fd >= 0)
351 close(mf->files[i].fd);
352 mf->files[i].fd = -1;
359 * Read one block from a metafile. Interface mirrors bfile.
361 int mf_read(MFile mf, int no, int offset, int num, void *buf)
365 if ((rd = file_position(mf, no, offset)) < 0)
370 toread = num ? num : mf->blocksize;
371 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
373 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
374 mf->files[mf->cur_file].path);
377 else if (rd < toread)
386 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
388 int ps, nblocks, towrite;
390 char tmp[FILENAME_MAX+1];
391 unsigned char dummych = '\xff';
393 if ((ps = file_position(mf, no, offset)) < 0)
395 /* file needs to grow */
396 while (ps >= mf->files[mf->cur_file].blocks)
398 logf (LOG_DEBUG, "File grows");
399 /* file overflow - allocate new file */
400 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
401 (ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
402 mf->files[mf->cur_file].dir->avail_bytes)
405 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
408 logf (LOG_DEBUG, "Capping off file %s at pos %d",
409 mf->files[mf->cur_file].path, nblocks);
410 if ((ps = file_position(mf,
411 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
412 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
414 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
416 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
419 mf->files[mf->cur_file].blocks += nblocks;
420 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
421 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
425 logf (LOG_DEBUG, "Creating new file.");
426 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
427 dp->avail_bytes < mf->min_bytes_creat; dp = dp->next);
430 logf (LOG_FATAL, "Cannot allocate more space for %s",
434 mf->files[mf->cur_file].top = (mf->cur_file ?
435 mf->files[mf->cur_file-1].top : -1) +
436 mf->files[mf->cur_file].blocks;
437 mf->files[++(mf->cur_file)].top = -1;
438 mf->files[mf->cur_file].dir = dp;
439 mf->files[mf->cur_file].number =
440 mf->files[mf->cur_file-1].number + 1;
441 mf->files[mf->cur_file].blocks =
442 mf->files[mf->cur_file].bytes = 0;
443 mf->files[mf->cur_file].fd = -1;
444 sprintf(tmp, "%s/%s.mf.%d", dp->name, mf->name,
445 mf->files[mf->cur_file].number);
446 mf->files[mf->cur_file].path = xstrdup(tmp);
448 /* open new file and position at beginning */
449 if ((ps = file_position(mf, no, offset)) < 0)
454 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
455 mf->files[mf->cur_file].blocks += nblocks;
456 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
457 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
458 mf->files[mf->cur_file].dir->avail_bytes -=
459 nblocks * mf->blocksize;
462 towrite = num ? num : mf->blocksize;
463 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
465 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
472 * Destroy a metafile, unlinking component files. File must be open.
474 int mf_unlink(MFile mf)
481 * Unlink the file by name, rather than MFile-handle. File should be closed.
483 int mf_unlink_name(MFile_area ma, const char *name)