2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.2 1994-08-23 14:50:48 quinn
10 * Revision 1.1 1994/08/23 14:41:33 quinn
11 * First functional version.
15 #include <sys/types.h>
25 static MFile_area_struct *open_areas = 0;
26 static MFile_area_struct *default_area = 0;
28 static int scan_areadef(MFile_area ma, const char *name)
30 const char *ad = res_get(common_resource, name);
31 int offset = 0, rs, size, multi, rd;
32 char dirname[FILENAME_MAX+1], unit;
33 mf_dir **dp = &ma->dirs, *dir = *dp;
37 log(LOG_FATAL, "Could not find resource '%s'", name);
42 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
47 log(LOG_FATAL, "Illegal directory description: %s", ad + offset);
52 case 'B': case 'b': multi = 1; break;
53 case 'K': case 'k': multi = 1024; break;
54 case 'M': case 'm': multi = 1048576; break;
56 log(LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
59 *dp = dir = xmalloc(sizeof(mf_dir));
61 strcpy(dir->name, dirname);
62 dir->max_bytes = dir->avail_bytes = size * multi;
69 static int file_position(MFile mf, int pos)
71 int off = 0, c = mf->cur_file, ps;
73 if ((c > 0 && pos <= mf->files[c-1].top) ||
74 (c < mf->no_files -1 && pos > mf->files[c].top))
77 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
79 off += mf->files[c].blocks;
82 assert(c < mf->no_files);
85 off = c ? (mf->files[c-1].top + 1) : 0;
86 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
87 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
89 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
92 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize, SEEK_SET) < 0)
94 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
101 static int cmp_part_file(const void *p1, const void *p2)
103 return ((part_file *)p1)->number - ((part_file *)p2)->number;
107 * Create a new area, cotaining metafiles in directories.
108 * Find the part-files in each directory, and inventory the existing metafiles.
110 MFile_area mf_init(const char *name)
112 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
119 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
121 for (mp = open_areas; mp; mp = mp->next)
122 if (!strcmp(name, mp->name))
124 strcpy(ma->name, name);
125 ma->next = open_areas;
129 if (scan_areadef(ma, name) < 0)
131 log(LOG_FATAL, "Failed to access description of '%s'", name);
134 /* look at each directory */
135 for (dirp = ma->dirs; dirp; dirp = dirp->next)
137 if (!(dd = opendir(dirp->name)))
139 log(LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
142 /* look at each file */
143 while ((dent = readdir(dd)))
145 if (*dent->d_name == '.')
147 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
149 log(LOG_FATAL, "Failed to resolve part-name %s", dent->d_name);
152 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
155 if (!strcmp(meta_f->name, metaname))
157 part_f = &meta_f->files[meta_f->no_files++];
164 meta_f = xmalloc(sizeof(*meta_f));
166 meta_f->next = ma->mfiles;
168 meta_f->cur_file = -1;
170 strcpy(meta_f->name, metaname);
171 part_f = &meta_f->files[0];
172 meta_f->no_files = 1;
174 part_f->number = number;
177 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
178 part_f->path = xstrdup(tmpnam);
180 if ((fd = open(part_f->path, O_RDONLY)) < 0)
182 log(LOG_FATAL|LOG_ERRNO, "Failed to access %s", dent->d_name);
185 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
187 log(LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", dent->d_name);
191 dirp->avail_bytes -= part_f->bytes;
195 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
197 log(LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
199 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
207 * If !ma, Use MF_DEFAULT_AREA.
209 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
211 struct meta_file *new;
213 char tmp[FILENAME_MAX+1];
218 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
220 log(LOG_FATAL, "Failed to open default area.");
225 for (new = ma->mfiles; new; new = new->next)
226 if (!strcmp(name, new->name))
233 new = xmalloc(sizeof(*new));
234 strcpy(new->name, name);
235 /* allocate one, empty file */
237 new->files[0].bytes = new->files[0].blocks = 0;
238 new->files[0].top = -1;
239 new->files[0].number = 0;
240 new->files[0].fd = -1;
241 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
242 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
246 log(LOG_FATAL, "Insufficient space for new mfile.");
249 new->files[0].dir = dp;
250 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
251 new->files[0].path = xstrdup(tmp);
258 new->blocksize = block_size;
259 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
264 for (i = 0; i < new->no_files; i++)
266 new->files[i].blocks = new->files[i].bytes / new->blocksize;
267 if (i == new->no_files)
268 new->files[i].top = -1;
270 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
271 : (new->files[i].blocks - 1);
279 int mf_close(MFile mf)
284 for (i = 0; i < mf->no_files; i++)
285 if (mf->files[i].fd >= 0)
286 close(mf->files[i].fd);
292 * Read one block from a metafile. Interface mirrors bfile.
294 int mf_read(MFile mf, int no, int offset, int num, void *buf)
296 if (file_position(mf, no) < 0)
298 if (read(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
300 log(LOG_FATAL|LOG_ERRNO, "Read failed");
309 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
313 char tmp[FILENAME_MAX+1];
315 if ((ps = file_position(mf, no)) < 0)
317 assert(ps <= mf->files[mf->cur_file].blocks);
319 if (ps == mf->files[mf->cur_file].blocks)
321 assert(mf->cur_file == mf->no_files - 1);
322 /* create new file */
323 if (mf->files[mf->cur_file].dir->avail_bytes <
326 log(LOG_DEBUG, "Creating new file.");
327 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
331 log(LOG_FATAL, "Cannot allocate more space for %s", mf->name);
334 mf->files[mf->cur_file].top = no - 1;
335 mf->files[++(mf->cur_file)].top = -1;
336 mf->files[mf->cur_file].dir = dp;
337 mf->files[mf->cur_file].number =
338 mf->files[mf->cur_file-1].number + 1;
339 mf->files[mf->cur_file].blocks =
340 mf->files[mf->cur_file].bytes = 0;
341 mf->files[mf->cur_file].fd = -1;
342 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
343 mf->files[mf->cur_file].number);
344 mf->files[mf->cur_file].path = xstrdup(tmp);
346 /* open new file and position at beginning */
347 if (file_position(mf, no) < 0)
350 mf->files[mf->cur_file].blocks++;
351 mf->files[mf->cur_file].bytes += mf->blocksize;
352 mf->files[mf->cur_file].dir->avail_bytes -= mf->blocksize;
354 if (write(mf->files[mf->cur_file].fd, buf, mf->blocksize) < mf->blocksize)
356 log(LOG_FATAL|LOG_ERRNO, "Write failed");
363 * Destroy a metafile, unlinking component files. File must be open.
365 int mf_unlink(MFile mf)
372 * Unlink the file by name, rather than MFile-handle. File should be closed.
374 int mf_unlink_name(MFile_area ma, const char *name)