2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.1 1994-08-23 14:41:33 quinn
8 * First functional version.
12 #include <sys/types.h>
22 static MFile_area_struct *open_areas = 0;
23 static MFile_area_struct *default_area = 0;
25 static int scan_areadef(MFile_area ma, const char *name)
27 const char *ad = res_get(common_resource, name);
28 int offset = 0, rs, size, multi, rd;
29 char dirname[FILENAME_MAX+1], unit;
30 mf_dir **dp = &ma->dirs, *dir = *dp;
34 log(LOG_FATAL, "Could not find resource '%s'", name);
39 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
44 log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
49 case 'B': case 'b': multi = 1; break;
50 case 'K': case 'k': multi = 1024; break;
51 case 'M': case 'm': multi = 1048576; break;
53 log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
56 *dp = dir = xmalloc(sizeof(mf_dir));
58 strcpy(dir->name, dirname);
59 dir->max_bytes = dir->avail_bytes = size * multi;
66 static int file_position(MFile mf, int pos)
68 int off = 0, c = mf->cur_file, ps;
70 if ((c > 0 && pos <= mf->files[c-1].top) ||
71 (c < mf->no_files -1 && pos > mf->files[c].top))
74 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
76 off += mf->files[c].blocks;
79 assert(c < mf->no_files);
82 off = c ? (mf->files[c-1].top + 1) : 0;
83 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
84 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
86 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
89 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
91 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
98 static int cmp_part_file(const void *p1, const void *p2)
100 return ((part_file *)p1)->number - ((part_file *)p2)->number;
104 * Create a new area, cotaining metafiles in directories.
105 * Find the part-files in each directory, and inventory the existing metafiles.
107 MFile_area mf_init(const char *name)
109 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
116 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
118 for (mp = open_areas; mp; mp = mp->next)
119 if (!strcmp(name, mp->name))
121 strcpy(ma->name, name);
122 ma->next = open_areas;
126 if (scan_areadef(ma, name) < 0)
128 log(LOG_FATAL, "Failed to access description of '%s'", name);
131 /* look at each directory */
132 for (dirp = ma->dirs; dirp; dirp = dirp->next)
134 if (!(dd = opendir(dirp->name)))
136 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
139 /* look at each file */
140 while ((dent = readdir(dd)))
142 if (*dent->d_name == '.')
144 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
146 log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
149 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
152 if (!strcmp(meta_f->name, metaname))
154 part_f = &meta_f->files[meta_f->no_files++];
161 meta_f = xmalloc(sizeof(*meta_f));
163 meta_f->next = ma->mfiles;
165 meta_f->cur_file = -1;
167 strcpy(meta_f->name, metaname);
168 part_f = &meta_f->files[0];
169 meta_f->no_files = 1;
171 part_f->number = number;
174 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
175 part_f->path = xstrdup(tmpnam);
177 if ((fd = open(part_f->path, O_RDONLY)) < 0)
179 log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
182 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
184 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
188 dirp->avail_bytes -= part_f->bytes;
192 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
194 log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
196 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
204 * If !ma, Use MF_DEFAULT_AREA.
206 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
208 struct meta_file *new;
210 char tmp[FILENAME_MAX+1];
215 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
217 log(LOG_FATAL, "Failed to open default area.");
222 for (new = ma->mfiles; new; new = new->next)
223 if (!strcmp(name, new->name))
230 new = xmalloc(sizeof(*new));
231 strcpy(new->name, name);
232 /* allocate one, empty file */
234 new->files[0].bytes = new->files[0].blocks = 0;
235 new->files[0].top = -1;
236 new->files[0].number = 0;
237 new->files[0].fd = -1;
238 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
239 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
243 log(LOG_FATAL, "Insufficient space for new mfile.");
246 new->files[0].dir = dp;
247 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
248 new->files[0].path = xstrdup(tmp);
251 new->blocksize = block_size;
252 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
256 for (i = 0; i < new->no_files; i++)
258 new->files[i].blocks = new->files[i].bytes / new->blocksize;
259 if (i == new->no_files)
260 new->files[i].top = -1;
262 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
263 : (new->files[i].blocks - 1);
271 int mf_close(MFile mf)
278 * Read one block from a metafile. Interface mirrors bfile.
280 int mf_read(MFile mf, int no, int offset, int num, void *buf)
282 if (file_position(mf, no) < 0)
284 if (read(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
286 log(LOG_FATAL|LOG_ERRNO, "Read failed");
295 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
299 char tmp[FILENAME_MAX+1];
301 if ((ps = file_position(mf, no)) < 0)
303 assert(ps <= mf->files[mf->cur_file].blocks);
305 if (ps == mf->files[mf->cur_file].blocks)
307 assert(mf->cur_file == mf->no_files - 1);
308 /* create new file */
309 if (mf->files[mf->cur_file].dir->avail_bytes <
312 log(LOG_DEBUG, "Creating new file.");
313 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
317 log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
320 mf->files[mf->cur_file].top = no - 1;
321 mf->files[++(mf->cur_file)].top = -1;
322 mf->files[mf->cur_file].dir = dp;
323 mf->files[mf->cur_file].number =
324 mf->files[mf->cur_file-1].number + 1;
325 mf->files[mf->cur_file].blocks =
326 mf->files[mf->cur_file].bytes = 0;
327 mf->files[mf->cur_file].fd = -1;
328 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
329 mf->files[mf->cur_file].number);
330 mf->files[mf->cur_file].path = xstrdup(tmp);
332 /* open new file and position at beginning */
333 if (file_position(mf, no) < 0)
336 mf->files[mf->cur_file].blocks++;
337 mf->files[mf->cur_file].bytes += mf->blocksize;
338 mf->files[mf->cur_file].dir->avail_bytes -= mf->blocksize;
340 if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
342 log(LOG_FATAL|LOG_ERRNO, "Write failed");
349 * Destroy a metafile, unlinking component files. File must be open.
351 int mf_unlink(MFile mf)
358 * Unlink the file by name, rather than MFile-handle. File should be closed.
360 int mf_unlink_name(MFile_area ma, const char *name)