2 * Copyright (C) 1994-2002, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
6 * $Id: mfile.c,v 1.45 2002-07-09 10:05:31 adam Exp $
11 * TODO: The size estimates in init may not be accurate due to
12 * only partially written final blocks.
15 #include <sys/types.h>
29 #include <zebra-lock.h>
33 static int scan_areadef(MFile_area ma, const char *ad, const char *base)
36 * If no definition is given, use current directory, unlimited.
38 char dirname[FILENAME_MAX+1];
39 mf_dir **dp = &ma->dirs, *dir = *dp;
46 int i = 0, fact = 1, multi;
49 while (*ad == ' ' || *ad == '\t')
53 if (!yaz_is_abspath(ad) && base)
55 strcpy (dirname, base);
61 if (*ad == ':' && strchr ("+-0123456789", ad[1]))
70 logf (LOG_WARN, "Missing colon after path: %s", ad0);
75 logf (LOG_WARN, "Empty path: %s", ad0);
78 while (*ad == ' ' || *ad == '\t')
88 if (*ad < '0' || *ad > '9')
90 logf (LOG_FATAL, "Missing size after path: %s", ad0);
94 while (*ad >= '0' && *ad <= '9')
95 size = size*10 + (*ad++ - '0');
98 case 'B': case 'b': multi = 1; break;
99 case 'K': case 'k': multi = 1024; break;
100 case 'M': case 'm': multi = 1048576; break;
101 case 'G': case 'g': multi = 1073741824; break;
103 logf (LOG_FATAL, "Missing unit: %s", ad0);
106 logf (LOG_FATAL, "Illegal unit: %c in %s", *ad, ad0);
110 *dp = dir = (mf_dir *) xmalloc(sizeof(mf_dir));
112 strcpy(dir->name, dirname);
113 dir->max_bytes = dir->avail_bytes = fact * size * multi;
119 static int file_position(MFile mf, int pos, int offset)
121 int off = 0, c = mf->cur_file, ps;
123 if ((c > 0 && pos <= mf->files[c-1].top) ||
124 (c < mf->no_files -1 && pos > mf->files[c].top))
127 while (c + 1 < mf->no_files && mf->files[c].top < pos)
129 off += mf->files[c].blocks;
132 assert(c < mf->no_files);
135 off = c ? (mf->files[c-1].top + 1) : 0;
136 if (mf->files[c].fd < 0)
138 if ((mf->files[c].fd = open(mf->files[c].path,
140 (O_BINARY|O_RDWR|O_CREAT) :
141 (O_BINARY|O_RDONLY), 0666)) < 0)
143 if (!mf->wr && errno == ENOENT && off == 0)
145 logf (LOG_WARN|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
149 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
152 logf (LOG_WARN|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
159 static int cmp_part_file(const void *p1, const void *p2)
161 return ((part_file *)p1)->number - ((part_file *)p2)->number;
165 * Create a new area, cotaining metafiles in directories.
166 * Find the part-files in each directory, and inventory the existing metafiles.
168 MFile_area mf_init(const char *name, const char *spec, const char *base)
170 MFile_area ma = (MFile_area) xmalloc(sizeof(*ma));
173 part_file *part_f = 0;
177 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
179 logf (LOG_DEBUG, "mf_init(%s)", name);
180 strcpy(ma->name, name);
183 if (scan_areadef(ma, spec, base) < 0)
185 logf (LOG_WARN, "Failed to access description of '%s'", name);
188 /* look at each directory */
189 for (dirp = ma->dirs; dirp; dirp = dirp->next)
191 if (!(dd = opendir(dirp->name)))
193 logf (LOG_WARN|LOG_ERRNO, "Failed to open directory %s",
197 /* look at each file */
198 while ((dent = readdir(dd)))
200 int len = strlen(dent->d_name);
201 const char *cp = strrchr (dent->d_name, '-');
202 if (strchr (".-", *dent->d_name))
204 if (len < 5 || !cp || strcmp (dent->d_name + len - 3, ".mf"))
207 memcpy (metaname, dent->d_name, cp - dent->d_name);
208 metaname[ cp - dent->d_name] = '\0';
210 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
213 if (!strcmp(meta_f->name, metaname))
215 part_f = &meta_f->files[meta_f->no_files++];
222 meta_f = (meta_file *) xmalloc(sizeof(*meta_f));
223 zebra_mutex_init (&meta_f->mutex);
225 meta_f->next = ma->mfiles;
227 meta_f->cur_file = -1;
229 strcpy(meta_f->name, metaname);
230 part_f = &meta_f->files[0];
231 meta_f->no_files = 1;
233 part_f->number = number;
236 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
237 part_f->path = xstrdup(tmpnam);
239 if ((fd = open(part_f->path, O_BINARY|O_RDONLY)) < 0)
241 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
245 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
247 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
252 if (dirp->max_bytes >= 0)
253 dirp->avail_bytes -= part_f->bytes;
257 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
259 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
261 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
267 void mf_destroy(MFile_area ma)
285 meta_file *m = meta_f;
287 for (i = 0; i<m->no_files; i++)
289 xfree (m->files[i].path);
291 zebra_mutex_destroy (&meta_f->mutex);
292 meta_f = meta_f->next;
298 void mf_reset(MFile_area ma)
308 meta_file *m = meta_f;
311 for (i = 0; i<m->no_files; i++)
313 unlink (m->files[i].path);
314 xfree (m->files[i].path);
316 meta_f = meta_f->next;
324 * If !ma, Use MF_DEFAULT_AREA.
326 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
330 char tmp[FILENAME_MAX+1];
333 logf(LOG_DEBUG, "mf_open(%s bs=%d, %s)", name, block_size,
334 wflag ? "RW" : "RDONLY");
336 for (mnew = ma->mfiles; mnew; mnew = mnew->next)
337 if (!strcmp(name, mnew->name))
346 mnew = (meta_file *) xmalloc(sizeof(*mnew));
347 strcpy(mnew->name, name);
348 /* allocate one, empty file */
349 zebra_mutex_init (&mnew->mutex);
351 mnew->files[0].bytes = 0;
352 mnew->files[0].blocks = 0;
353 mnew->files[0].top = -1;
354 mnew->files[0].number = 0;
355 mnew->files[0].fd = -1;
356 mnew->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
357 for (dp = ma->dirs; dp && dp->max_bytes >= 0 && dp->avail_bytes <
358 mnew->min_bytes_creat; dp = dp->next);
361 logf (LOG_FATAL, "Insufficient space for new mfile.");
364 mnew->files[0].dir = dp;
365 sprintf(tmp, "%s/%s-%d.mf", dp->name, mnew->name, 0);
366 mnew->files[0].path = xstrdup(tmp);
368 mnew->next = ma->mfiles;
373 for (i = 0; i < mnew->no_files; i++)
375 if (mnew->files[i].bytes % block_size)
376 mnew->files[i].bytes += block_size - mnew->files[i].bytes %
378 mnew->files[i].blocks = mnew->files[i].bytes / block_size;
382 mnew->blocksize = block_size;
383 mnew->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
388 for (i = 0; i < mnew->no_files; i++)
390 mnew->files[i].blocks = mnew->files[i].bytes / mnew->blocksize;
391 if (i == mnew->no_files - 1)
392 mnew->files[i].top = -1;
395 i ? (mnew->files[i-1].top + mnew->files[i].blocks)
396 : (mnew->files[i].blocks - 1);
404 int mf_close(MFile mf)
408 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
410 for (i = 0; i < mf->no_files; i++)
411 if (mf->files[i].fd >= 0)
413 close(mf->files[i].fd);
414 mf->files[i].fd = -1;
421 * Read one block from a metafile. Interface mirrors bfile.
423 int mf_read(MFile mf, int no, int offset, int nbytes, void *buf)
427 zebra_mutex_lock (&mf->mutex);
428 if ((rd = file_position(mf, no, offset)) < 0)
432 zebra_mutex_unlock (&mf->mutex);
437 yaz_log (LOG_FATAL, "mf_read %s internal error", mf->name);
441 toread = nbytes ? nbytes : mf->blocksize;
442 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
444 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
445 mf->files[mf->cur_file].path);
448 zebra_mutex_unlock (&mf->mutex);
458 int mf_write(MFile mf, int no, int offset, int nbytes, const void *buf)
460 int ps, nblocks, towrite;
462 char tmp[FILENAME_MAX+1];
463 unsigned char dummych = '\xff';
465 zebra_mutex_lock (&mf->mutex);
466 if ((ps = file_position(mf, no, offset)) < 0)
468 yaz_log (LOG_FATAL, "mf_write %s internal error (1)", mf->name);
471 /* file needs to grow */
472 while (ps >= mf->files[mf->cur_file].blocks)
474 off_t needed = (ps - mf->files[mf->cur_file].blocks + 1) *
476 /* file overflow - allocate new file */
477 if (mf->files[mf->cur_file].dir->max_bytes >= 0 &&
478 needed > mf->files[mf->cur_file].dir->avail_bytes)
481 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
484 logf (LOG_DEBUG, "Capping off file %s at pos %d",
485 mf->files[mf->cur_file].path, nblocks);
486 if ((ps = file_position(mf,
487 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
488 mf->files[mf->cur_file].blocks + nblocks - 1, 0)) < 0)
490 yaz_log (LOG_FATAL, "mf_write %s internal error (2)",
494 logf (LOG_DEBUG, "ps = %d", ps);
495 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
497 logf (LOG_ERRNO|LOG_FATAL, "mf_write %s internal error (3)",
501 mf->files[mf->cur_file].blocks += nblocks;
502 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
503 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
507 logf (LOG_DEBUG, "Creating new file.");
508 for (dp = mf->ma->dirs; dp && dp->max_bytes >= 0 &&
509 dp->avail_bytes < needed; dp = dp->next);
512 logf (LOG_FATAL, "Cannot allocate more space for %s",
516 mf->files[mf->cur_file].top = (mf->cur_file ?
517 mf->files[mf->cur_file-1].top : -1) +
518 mf->files[mf->cur_file].blocks;
519 mf->files[++(mf->cur_file)].top = -1;
520 mf->files[mf->cur_file].dir = dp;
521 mf->files[mf->cur_file].number =
522 mf->files[mf->cur_file-1].number + 1;
523 mf->files[mf->cur_file].blocks =
524 mf->files[mf->cur_file].bytes = 0;
525 mf->files[mf->cur_file].fd = -1;
526 sprintf(tmp, "%s/%s-%d.mf", dp->name, mf->name,
527 mf->files[mf->cur_file].number);
528 mf->files[mf->cur_file].path = xstrdup(tmp);
530 /* open new file and position at beginning */
531 if ((ps = file_position(mf, no, offset)) < 0)
533 yaz_log (LOG_FATAL, "mf_write %s internal error (4)",
540 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
541 mf->files[mf->cur_file].blocks += nblocks;
542 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
543 if (mf->files[mf->cur_file].dir->max_bytes >= 0)
544 mf->files[mf->cur_file].dir->avail_bytes -=
545 nblocks * mf->blocksize;
548 towrite = nbytes ? nbytes : mf->blocksize;
549 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
551 logf (LOG_FATAL|LOG_ERRNO, "Write failed for file %s part %d",
552 mf->name, mf->cur_file);
555 zebra_mutex_unlock (&mf->mutex);
560 * Destroy a metafile, unlinking component files. File must be open.
562 int mf_unlink(MFile mf)
566 for (i = 0; i < mf->no_files; i++)
567 unlink (mf->files[i].path);
572 * Unlink the file by name, rather than MFile-handle. File should be closed.
574 int mf_unlink_name(MFile_area ma, const char *name)