2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.4 1994-09-01 14:51:07 quinn
8 * Allowed mf_write to write beyond eof+1.
10 * Revision 1.3 1994/08/24 09:37:17 quinn
11 * Changed reaction to read return values.
13 * Revision 1.2 1994/08/23 14:50:48 quinn
16 * Revision 1.1 1994/08/23 14:41:33 quinn
17 * First functional version.
21 #include <sys/types.h>
31 static MFile_area_struct *open_areas = 0;
32 static MFile_area_struct *default_area = 0;
34 static int scan_areadef(MFile_area ma, const char *name)
36 const char *ad = res_get(common_resource, name);
37 int offset = 0, rs, size, multi, rd;
38 char dirname[FILENAME_MAX+1], unit;
39 mf_dir **dp = &ma->dirs, *dir = *dp;
43 log(LOG_FATAL, "Could not find resource '%s'", name);
48 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
53 log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
58 case 'B': case 'b': multi = 1; break;
59 case 'K': case 'k': multi = 1024; break;
60 case 'M': case 'm': multi = 1048576; break;
62 log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
65 *dp = dir = xmalloc(sizeof(mf_dir));
67 strcpy(dir->name, dirname);
68 dir->max_bytes = dir->avail_bytes = size * multi;
75 static int file_position(MFile mf, int pos)
77 int off = 0, c = mf->cur_file, ps;
79 if ((c > 0 && pos <= mf->files[c-1].top) ||
80 (c < mf->no_files -1 && pos > mf->files[c].top))
83 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
85 off += mf->files[c].blocks;
88 assert(c < mf->no_files);
91 off = c ? (mf->files[c-1].top + 1) : 0;
92 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
93 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
95 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
98 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
100 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
107 static int cmp_part_file(const void *p1, const void *p2)
109 return ((part_file *)p1)->number - ((part_file *)p2)->number;
113 * Create a new area, cotaining metafiles in directories.
114 * Find the part-files in each directory, and inventory the existing metafiles.
116 MFile_area mf_init(const char *name)
118 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
125 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
127 for (mp = open_areas; mp; mp = mp->next)
128 if (!strcmp(name, mp->name))
130 strcpy(ma->name, name);
131 ma->next = open_areas;
135 if (scan_areadef(ma, name) < 0)
137 log(LOG_FATAL, "Failed to access description of '%s'", name);
140 /* look at each directory */
141 for (dirp = ma->dirs; dirp; dirp = dirp->next)
143 if (!(dd = opendir(dirp->name)))
145 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
148 /* look at each file */
149 while ((dent = readdir(dd)))
151 if (*dent->d_name == '.')
153 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
155 log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
158 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
161 if (!strcmp(meta_f->name, metaname))
163 part_f = &meta_f->files[meta_f->no_files++];
170 meta_f = xmalloc(sizeof(*meta_f));
172 meta_f->next = ma->mfiles;
174 meta_f->cur_file = -1;
176 strcpy(meta_f->name, metaname);
177 part_f = &meta_f->files[0];
178 meta_f->no_files = 1;
180 part_f->number = number;
183 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
184 part_f->path = xstrdup(tmpnam);
186 if ((fd = open(part_f->path, O_RDONLY)) < 0)
188 log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
191 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
193 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
197 dirp->avail_bytes -= part_f->bytes;
201 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
203 log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
205 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
213 * If !ma, Use MF_DEFAULT_AREA.
215 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
217 struct meta_file *new;
219 char tmp[FILENAME_MAX+1];
224 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
226 log(LOG_FATAL, "Failed to open default area.");
231 for (new = ma->mfiles; new; new = new->next)
232 if (!strcmp(name, new->name))
239 new = xmalloc(sizeof(*new));
240 strcpy(new->name, name);
241 /* allocate one, empty file */
243 new->files[0].bytes = new->files[0].blocks = 0;
244 new->files[0].top = -1;
245 new->files[0].number = 0;
246 new->files[0].fd = -1;
247 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
248 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
252 log(LOG_FATAL, "Insufficient space for new mfile.");
255 new->files[0].dir = dp;
256 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
257 new->files[0].path = xstrdup(tmp);
264 new->blocksize = block_size;
265 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
270 for (i = 0; i < new->no_files; i++)
272 new->files[i].blocks = new->files[i].bytes / new->blocksize;
273 if (i == new->no_files)
274 new->files[i].top = -1;
276 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
277 : (new->files[i].blocks - 1);
285 int mf_close(MFile mf)
290 for (i = 0; i < mf->no_files; i++)
291 if (mf->files[i].fd >= 0)
292 close(mf->files[i].fd);
298 * Read one block from a metafile. Interface mirrors bfile.
300 int mf_read(MFile mf, int no, int offset, int num, void *buf)
304 if (file_position(mf, no) < 0)
306 if ((rd = read(mf->files[mf->cur_file].fd, buf, mf->blocksize)) < 0)
308 log(LOG_FATAL|LOG_ERRNO, "Read failed");
311 else if (rd < mf->blocksize)
320 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
324 char tmp[FILENAME_MAX+1];
325 unsigned char dummych = '\xff';
327 if ((ps = file_position(mf, no)) < 0)
329 /* file needs to grow */
330 while (ps >= mf->files[mf->cur_file].blocks)
332 log(LOG_DEBUG, "File grows");
333 /* file overflow - allocate new file */
334 if ((ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
335 mf->files[mf->cur_file].dir->avail_bytes)
338 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
341 log(LOG_DEBUG, "Capping off file %s at pos %d",
342 mf->files[mf->cur_file].path, nblocks);
343 if ((ps = file_position(mf,
344 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
345 mf->files[mf->cur_file].blocks + nblocks)) < 0)
347 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
349 log(LOG_ERRNO|LOG_FATAL, "write dummy");
352 mf->files[mf->cur_file].blocks += nblocks;
353 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
354 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
358 log(LOG_DEBUG, "Creating new file.");
359 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
363 log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
366 mf->files[mf->cur_file].top = (mf->cur_file ?
367 mf->files[mf->cur_file-1].top : -1) +
368 mf->files[mf->cur_file].blocks;
369 mf->files[++(mf->cur_file)].top = -1;
370 mf->files[mf->cur_file].dir = dp;
371 mf->files[mf->cur_file].number =
372 mf->files[mf->cur_file-1].number + 1;
373 mf->files[mf->cur_file].blocks =
374 mf->files[mf->cur_file].bytes = 0;
375 mf->files[mf->cur_file].fd = -1;
376 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
377 mf->files[mf->cur_file].number);
378 mf->files[mf->cur_file].path = xstrdup(tmp);
380 /* open new file and position at beginning */
381 if ((ps = file_position(mf, no)) < 0)
386 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
387 mf->files[mf->cur_file].blocks += nblocks;
388 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
389 mf->files[mf->cur_file].dir->avail_bytes -= nblocks * mf->blocksize;
392 if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
394 log(LOG_FATAL|LOG_ERRNO, "Write failed");
401 * Destroy a metafile, unlinking component files. File must be open.
403 int mf_unlink(MFile mf)
410 * Unlink the file by name, rather than MFile-handle. File should be closed.
412 int mf_unlink_name(MFile_area ma, const char *name)