2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.3 1994-08-24 09:37:17 quinn
8 * Changed reaction to read return values.
10 * Revision 1.2 1994/08/23 14:50:48 quinn
13 * Revision 1.1 1994/08/23 14:41:33 quinn
14 * First functional version.
18 #include <sys/types.h>
28 static MFile_area_struct *open_areas = 0;
29 static MFile_area_struct *default_area = 0;
31 static int scan_areadef(MFile_area ma, const char *name)
33 const char *ad = res_get(common_resource, name);
34 int offset = 0, rs, size, multi, rd;
35 char dirname[FILENAME_MAX+1], unit;
36 mf_dir **dp = &ma->dirs, *dir = *dp;
40 log(LOG_FATAL, "Could not find resource '%s'", name);
45 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
50 log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
55 case 'B': case 'b': multi = 1; break;
56 case 'K': case 'k': multi = 1024; break;
57 case 'M': case 'm': multi = 1048576; break;
59 log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
62 *dp = dir = xmalloc(sizeof(mf_dir));
64 strcpy(dir->name, dirname);
65 dir->max_bytes = dir->avail_bytes = size * multi;
72 static int file_position(MFile mf, int pos)
74 int off = 0, c = mf->cur_file, ps;
76 if ((c > 0 && pos <= mf->files[c-1].top) ||
77 (c < mf->no_files -1 && pos > mf->files[c].top))
80 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
82 off += mf->files[c].blocks;
85 assert(c < mf->no_files);
88 off = c ? (mf->files[c-1].top + 1) : 0;
89 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
90 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
92 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
95 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
97 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
104 static int cmp_part_file(const void *p1, const void *p2)
106 return ((part_file *)p1)->number - ((part_file *)p2)->number;
110 * Create a new area, cotaining metafiles in directories.
111 * Find the part-files in each directory, and inventory the existing metafiles.
113 MFile_area mf_init(const char *name)
115 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
122 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
124 for (mp = open_areas; mp; mp = mp->next)
125 if (!strcmp(name, mp->name))
127 strcpy(ma->name, name);
128 ma->next = open_areas;
132 if (scan_areadef(ma, name) < 0)
134 log(LOG_FATAL, "Failed to access description of '%s'", name);
137 /* look at each directory */
138 for (dirp = ma->dirs; dirp; dirp = dirp->next)
140 if (!(dd = opendir(dirp->name)))
142 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
145 /* look at each file */
146 while ((dent = readdir(dd)))
148 if (*dent->d_name == '.')
150 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
152 log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
155 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
158 if (!strcmp(meta_f->name, metaname))
160 part_f = &meta_f->files[meta_f->no_files++];
167 meta_f = xmalloc(sizeof(*meta_f));
169 meta_f->next = ma->mfiles;
171 meta_f->cur_file = -1;
173 strcpy(meta_f->name, metaname);
174 part_f = &meta_f->files[0];
175 meta_f->no_files = 1;
177 part_f->number = number;
180 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
181 part_f->path = xstrdup(tmpnam);
183 if ((fd = open(part_f->path, O_RDONLY)) < 0)
185 log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
188 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
190 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
194 dirp->avail_bytes -= part_f->bytes;
198 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
200 log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
202 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
210 * If !ma, Use MF_DEFAULT_AREA.
212 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
214 struct meta_file *new;
216 char tmp[FILENAME_MAX+1];
221 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
223 log(LOG_FATAL, "Failed to open default area.");
228 for (new = ma->mfiles; new; new = new->next)
229 if (!strcmp(name, new->name))
236 new = xmalloc(sizeof(*new));
237 strcpy(new->name, name);
238 /* allocate one, empty file */
240 new->files[0].bytes = new->files[0].blocks = 0;
241 new->files[0].top = -1;
242 new->files[0].number = 0;
243 new->files[0].fd = -1;
244 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
245 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
249 log(LOG_FATAL, "Insufficient space for new mfile.");
252 new->files[0].dir = dp;
253 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
254 new->files[0].path = xstrdup(tmp);
261 new->blocksize = block_size;
262 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
267 for (i = 0; i < new->no_files; i++)
269 new->files[i].blocks = new->files[i].bytes / new->blocksize;
270 if (i == new->no_files)
271 new->files[i].top = -1;
273 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
274 : (new->files[i].blocks - 1);
282 int mf_close(MFile mf)
287 for (i = 0; i < mf->no_files; i++)
288 if (mf->files[i].fd >= 0)
289 close(mf->files[i].fd);
295 * Read one block from a metafile. Interface mirrors bfile.
297 int mf_read(MFile mf, int no, int offset, int num, void *buf)
301 if (file_position(mf, no) < 0)
303 if ((rd = read(mf->files[mf->cur_file].fd, buf, mf->blocksize)) < 0)
305 log(LOG_FATAL|LOG_ERRNO, "Read failed");
308 else if (rd < mf->blocksize)
317 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
321 char tmp[FILENAME_MAX+1];
323 if ((ps = file_position(mf, no)) < 0)
325 assert(ps <= mf->files[mf->cur_file].blocks);
327 if (ps == mf->files[mf->cur_file].blocks)
329 assert(mf->cur_file == mf->no_files - 1);
330 /* create new file */
331 if (mf->files[mf->cur_file].dir->avail_bytes <
334 log(LOG_DEBUG, "Creating new file.");
335 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
339 log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
342 mf->files[mf->cur_file].top = no - 1;
343 mf->files[++(mf->cur_file)].top = -1;
344 mf->files[mf->cur_file].dir = dp;
345 mf->files[mf->cur_file].number =
346 mf->files[mf->cur_file-1].number + 1;
347 mf->files[mf->cur_file].blocks =
348 mf->files[mf->cur_file].bytes = 0;
349 mf->files[mf->cur_file].fd = -1;
350 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
351 mf->files[mf->cur_file].number);
352 mf->files[mf->cur_file].path = xstrdup(tmp);
354 /* open new file and position at beginning */
355 if (file_position(mf, no) < 0)
358 mf->files[mf->cur_file].blocks++;
359 mf->files[mf->cur_file].bytes += mf->blocksize;
360 mf->files[mf->cur_file].dir->avail_bytes -= mf->blocksize;
362 if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
364 log(LOG_FATAL|LOG_ERRNO, "Write failed");
371 * Destroy a metafile, unlinking component files. File must be open.
373 int mf_unlink(MFile mf)
380 * Unlink the file by name, rather than MFile-handle. File should be closed.
382 int mf_unlink_name(MFile_area ma, const char *name)