1 /* $Id: bfile.c,v 1.44 2005-06-14 20:28:53 adam Exp $
2 Copyright (C) 1995-2005
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with Zebra; see the file LICENSE.zebra. If not, write to the
19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
35 #include <yaz/xmalloc.h>
36 #include <idzebra/util.h>
37 #include <idzebra/bfile.h>
44 Zebra_lock_rdwr rdwr_lock;
45 struct CFile_struct *cf;
56 struct BFiles_struct {
57 MFile_area commit_area;
58 MFile_area_struct *register_area;
63 BFiles bfs_create (const char *spec, const char *base)
65 BFiles bfs = (BFiles) xmalloc (sizeof(*bfs));
66 bfs->commit_area = NULL;
70 bfs->base = xstrdup (base);
71 bfs->register_area = mf_init("register", spec, base);
72 if (!bfs->register_area)
80 void bfs_destroy (BFiles bfs)
84 xfree (bfs->cache_fname);
86 mf_destroy (bfs->commit_area);
87 mf_destroy (bfs->register_area);
91 static FILE *open_cache (BFiles bfs, const char *flags)
95 file = fopen (bfs->cache_fname, flags);
99 static void unlink_cache (BFiles bfs)
101 unlink (bfs->cache_fname);
104 ZEBRA_RES bf_cache (BFiles bfs, const char *spec)
108 yaz_log (YLOG_LOG, "enabling shadow spec=%s", spec);
109 if (!bfs->commit_area)
110 bfs->commit_area = mf_init ("shadow", spec, bfs->base);
111 if (bfs->commit_area)
113 bfs->cache_fname = xmalloc (strlen(bfs->commit_area->dirs->name)+
115 strcpy (bfs->cache_fname, bfs->commit_area->dirs->name);
116 strcat (bfs->cache_fname, "/cache");
117 yaz_log (YLOG_LOG, "cache_fname = %s", bfs->cache_fname);
121 yaz_log(YLOG_WARN, "shadow could not be enabled");
126 bfs->commit_area = NULL;
130 int bf_close (BFile bf)
132 zebra_lock_rdwr_destroy (&bf->rdwr_lock);
136 xfree(bf->alloc_buf);
142 #define HEADER_SIZE 256
144 BFile bf_xopen(BFiles bfs, const char *name, int block_size, int wrflag,
145 const char *magic, int *read_version,
146 const char **more_info)
153 BFile bf = bf_open(bfs, name, block_size, wrflag);
157 /* HEADER_SIZE is considered enough for our header */
158 if (bf->alloc_buf_size < HEADER_SIZE)
159 bf->alloc_buf_size = HEADER_SIZE;
161 bf->alloc_buf_size = bf->block_size;
163 hbuf = bf->alloc_buf = xmalloc(bf->alloc_buf_size);
165 /* fill-in default values */
167 bf->root_block = bf->last_block = HEADER_SIZE / bf->block_size + 1;
168 bf->magic = xstrdup(magic);
170 if (!bf_read(bf, pos, 0, 0, hbuf + pos * bf->block_size))
173 bf->header_dirty = 1;
176 while(hbuf[pos * bf->block_size + i] != '\0')
178 if (i == bf->block_size)
179 { /* end of block at pos reached .. */
180 if (bf->alloc_buf_size < (pos+1) * bf->block_size)
182 /* not room for all in alloc_buf_size */
183 yaz_log(YLOG_WARN, "bad header for %s (3)", magic);
187 /* read next block in header */
189 if (!bf_read(bf, pos, 0, 0, hbuf + pos * bf->block_size))
191 yaz_log(YLOG_WARN, "missing header block %s (4)", magic);
195 i = 0; /* pos within block is reset */
200 if (sscanf(hbuf, "%39s %d " ZINT_FORMAT " " ZINT_FORMAT "%n",
201 read_magic, read_version, &bf->last_block,
202 &bf->free_list, &l) < 4 && l) /* if %n is counted, it's 5 */
204 yaz_log(YLOG_WARN, "bad header for %s (1)", magic);
208 if (strcmp(read_magic, magic))
210 yaz_log(YLOG_WARN, "bad header for %s (2)", magic);
215 *more_info = hbuf + l;
219 int bf_xclose (BFile bf, int version, const char *more_info)
221 if (bf->header_dirty)
224 assert(bf->alloc_buf);
226 sprintf(bf->alloc_buf, "%s %d " ZINT_FORMAT " " ZINT_FORMAT " ",
227 bf->magic, version, bf->last_block, bf->free_list);
229 strcat(bf->alloc_buf, more_info);
232 bf_write(bf, pos, 0, 0, bf->alloc_buf + pos * bf->block_size);
234 if (pos * bf->block_size > strlen(bf->alloc_buf))
241 BFile bf_open (BFiles bfs, const char *name, int block_size, int wflag)
243 BFile bf = (BFile) xmalloc(sizeof(struct BFile_struct));
247 bf->block_size = block_size;
248 bf->header_dirty = 0;
249 if (bfs->commit_area)
253 bf->mf = mf_open (bfs->register_area, name, block_size, 0);
254 bf->cf = cf_open (bf->mf, bfs->commit_area, name, block_size,
260 outf = open_cache(bfs, "ab");
263 yaz_log(YLOG_FATAL|YLOG_ERRNO, "open %s", bfs->cache_fname);
266 fprintf(outf, "%s %d\n", name, block_size);
272 bf->mf = mf_open(bfs->register_area, name, block_size, wflag);
277 yaz_log(YLOG_FATAL, "mf_open failed for %s", name);
281 zebra_lock_rdwr_init(&bf->rdwr_lock);
285 int bf_read (BFile bf, zint no, int offset, int nbytes, void *buf)
289 zebra_lock_rdwr_rlock (&bf->rdwr_lock);
292 if ((r = cf_read (bf->cf, no, offset, nbytes, buf)) == -1)
293 r = mf_read (bf->mf, no, offset, nbytes, buf);
296 r = mf_read (bf->mf, no, offset, nbytes, buf);
297 zebra_lock_rdwr_runlock (&bf->rdwr_lock);
301 int bf_write (BFile bf, zint no, int offset, int nbytes, const void *buf)
304 zebra_lock_rdwr_wlock (&bf->rdwr_lock);
306 r = cf_write (bf->cf, no, offset, nbytes, buf);
308 r = mf_write (bf->mf, no, offset, nbytes, buf);
309 zebra_lock_rdwr_wunlock (&bf->rdwr_lock);
313 int bf_commitExists (BFiles bfs)
317 inf = open_cache (bfs, "rb");
326 void bf_reset (BFiles bfs)
330 mf_reset (bfs->commit_area);
331 mf_reset (bfs->register_area);
334 void bf_commitExec (BFiles bfs)
343 assert (bfs->commit_area);
344 if (!(inf = open_cache (bfs, "rb")))
346 yaz_log (YLOG_LOG, "No commit file");
349 while (fscanf (inf, "%s %d", path, &block_size) == 2)
351 mf = mf_open (bfs->register_area, path, block_size, 1);
352 cf = cf_open (mf, bfs->commit_area, path, block_size, 0, &first_time);
362 void bf_commitClean (BFiles bfs, const char *spec)
372 if (!bfs->commit_area)
374 bf_cache (bfs, spec);
378 if (!(inf = open_cache (bfs, "rb")))
380 while (fscanf (inf, "%s %d", path, &block_size) == 2)
382 mf = mf_open (bfs->register_area, path, block_size, 0);
383 cf = cf_open (mf, bfs->commit_area, path, block_size, 1, &firstTime);
394 int bf_alloc(BFile bf, int no, zint *blocks)
397 assert(bf->alloc_buf);
398 bf->header_dirty = 1;
399 for (i = 0; i < no; i++)
402 blocks[i] = bf->last_block++;
406 const char *cp = buf;
407 memset(buf, '\0', sizeof(buf));
409 blocks[i] = bf->free_list;
410 if (!bf_read(bf, bf->free_list, 0, sizeof(buf), buf))
412 yaz_log(YLOG_WARN, "Bad freelist entry " ZINT_FORMAT,
416 zebra_zint_decode(&cp, &bf->free_list);
422 int bf_free(BFile bf, int no, const zint *blocks)
425 assert(bf->alloc_buf);
426 bf->header_dirty = 1;
427 for (i = 0; i < no; i++)
431 memset(buf, '\0', sizeof(buf));
432 zebra_zint_encode(&cp, bf->free_list);
433 bf->free_list = blocks[i];
434 bf_write(bf, bf->free_list, 0, sizeof(buf), buf);