2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.5 1994-09-12 08:01:51 quinn
10 * Revision 1.4 1994/09/01 14:51:07 quinn
11 * Allowed mf_write to write beyond eof+1.
13 * Revision 1.3 1994/08/24 09:37:17 quinn
14 * Changed reaction to read return values.
16 * Revision 1.2 1994/08/23 14:50:48 quinn
19 * Revision 1.1 1994/08/23 14:41:33 quinn
20 * First functional version.
24 #include <sys/types.h>
34 static MFile_area_struct *open_areas = 0;
35 static MFile_area_struct *default_area = 0;
37 static int scan_areadef(MFile_area ma, const char *name)
39 const char *ad = res_get(common_resource, name);
40 int offset = 0, rs, size, multi, rd;
41 char dirname[FILENAME_MAX+1], unit;
42 mf_dir **dp = &ma->dirs, *dir = *dp;
46 log(LOG_FATAL, "Could not find resource '%s'", name);
51 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
56 log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
61 case 'B': case 'b': multi = 1; break;
62 case 'K': case 'k': multi = 1024; break;
63 case 'M': case 'm': multi = 1048576; break;
65 log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
68 *dp = dir = xmalloc(sizeof(mf_dir));
70 strcpy(dir->name, dirname);
71 dir->max_bytes = dir->avail_bytes = size * multi;
78 static int file_position(MFile mf, int pos)
80 int off = 0, c = mf->cur_file, ps;
82 if ((c > 0 && pos <= mf->files[c-1].top) ||
83 (c < mf->no_files -1 && pos > mf->files[c].top))
86 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
88 off += mf->files[c].blocks;
91 assert(c < mf->no_files);
94 off = c ? (mf->files[c-1].top + 1) : 0;
95 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
96 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
98 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
101 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
103 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
110 static int cmp_part_file(const void *p1, const void *p2)
112 return ((part_file *)p1)->number - ((part_file *)p2)->number;
116 * Create a new area, cotaining metafiles in directories.
117 * Find the part-files in each directory, and inventory the existing metafiles.
119 MFile_area mf_init(const char *name)
121 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
128 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
130 log(LOG_DEBUG, "mf_init(%s)", name);
131 for (mp = open_areas; mp; mp = mp->next)
132 if (!strcmp(name, mp->name))
134 strcpy(ma->name, name);
135 ma->next = open_areas;
139 if (scan_areadef(ma, name) < 0)
141 log(LOG_FATAL, "Failed to access description of '%s'", name);
144 /* look at each directory */
145 for (dirp = ma->dirs; dirp; dirp = dirp->next)
147 if (!(dd = opendir(dirp->name)))
149 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
152 /* look at each file */
153 while ((dent = readdir(dd)))
155 if (*dent->d_name == '.')
157 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
159 log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
162 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
165 if (!strcmp(meta_f->name, metaname))
167 part_f = &meta_f->files[meta_f->no_files++];
174 meta_f = xmalloc(sizeof(*meta_f));
176 meta_f->next = ma->mfiles;
178 meta_f->cur_file = -1;
180 strcpy(meta_f->name, metaname);
181 part_f = &meta_f->files[0];
182 meta_f->no_files = 1;
184 part_f->number = number;
187 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
188 part_f->path = xstrdup(tmpnam);
190 if ((fd = open(part_f->path, O_RDONLY)) < 0)
192 log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
195 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
197 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
201 dirp->avail_bytes -= part_f->bytes;
205 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
207 log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
209 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
217 * If !ma, Use MF_DEFAULT_AREA.
219 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
221 struct meta_file *new;
223 char tmp[FILENAME_MAX+1];
226 log(LOG_LOG, "mf_open(%s)", name);
229 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
231 log(LOG_FATAL, "Failed to open default area.");
236 for (new = ma->mfiles; new; new = new->next)
237 if (!strcmp(name, new->name))
244 new = xmalloc(sizeof(*new));
245 strcpy(new->name, name);
246 /* allocate one, empty file */
248 new->files[0].bytes = new->files[0].blocks = 0;
249 new->files[0].top = -1;
250 new->files[0].number = 0;
251 new->files[0].fd = -1;
252 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
253 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
257 log(LOG_FATAL, "Insufficient space for new mfile.");
260 new->files[0].dir = dp;
261 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
262 new->files[0].path = xstrdup(tmp);
269 new->blocksize = block_size;
270 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
275 for (i = 0; i < new->no_files; i++)
277 new->files[i].blocks = new->files[i].bytes / new->blocksize;
278 if (i == new->no_files)
279 new->files[i].top = -1;
281 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
282 : (new->files[i].blocks - 1);
290 int mf_close(MFile mf)
295 for (i = 0; i < mf->no_files; i++)
296 if (mf->files[i].fd >= 0)
297 close(mf->files[i].fd);
303 * Read one block from a metafile. Interface mirrors bfile.
305 int mf_read(MFile mf, int no, int offset, int num, void *buf)
309 if (file_position(mf, no) < 0)
311 if ((rd = read(mf->files[mf->cur_file].fd, buf, mf->blocksize)) < 0)
313 log(LOG_FATAL|LOG_ERRNO, "Read failed");
316 else if (rd < mf->blocksize)
325 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
329 char tmp[FILENAME_MAX+1];
330 unsigned char dummych = '\xff';
332 if ((ps = file_position(mf, no)) < 0)
334 /* file needs to grow */
335 while (ps >= mf->files[mf->cur_file].blocks)
337 log(LOG_DEBUG, "File grows");
338 /* file overflow - allocate new file */
339 if ((ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
340 mf->files[mf->cur_file].dir->avail_bytes)
343 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
346 log(LOG_DEBUG, "Capping off file %s at pos %d",
347 mf->files[mf->cur_file].path, nblocks);
348 if ((ps = file_position(mf,
349 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
350 mf->files[mf->cur_file].blocks + nblocks)) < 0)
352 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
354 log(LOG_ERRNO|LOG_FATAL, "write dummy");
357 mf->files[mf->cur_file].blocks += nblocks;
358 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
359 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
363 log(LOG_DEBUG, "Creating new file.");
364 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
368 log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
371 mf->files[mf->cur_file].top = (mf->cur_file ?
372 mf->files[mf->cur_file-1].top : -1) +
373 mf->files[mf->cur_file].blocks;
374 mf->files[++(mf->cur_file)].top = -1;
375 mf->files[mf->cur_file].dir = dp;
376 mf->files[mf->cur_file].number =
377 mf->files[mf->cur_file-1].number + 1;
378 mf->files[mf->cur_file].blocks =
379 mf->files[mf->cur_file].bytes = 0;
380 mf->files[mf->cur_file].fd = -1;
381 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
382 mf->files[mf->cur_file].number);
383 mf->files[mf->cur_file].path = xstrdup(tmp);
385 /* open new file and position at beginning */
386 if ((ps = file_position(mf, no)) < 0)
391 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
392 mf->files[mf->cur_file].blocks += nblocks;
393 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
394 mf->files[mf->cur_file].dir->avail_bytes -= nblocks * mf->blocksize;
397 if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
399 log(LOG_FATAL|LOG_ERRNO, "Write failed");
406 * Destroy a metafile, unlinking component files. File must be open.
408 int mf_unlink(MFile mf)
415 * Unlink the file by name, rather than MFile-handle. File should be closed.
417 int mf_unlink_name(MFile_area ma, const char *name)