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69 theseven 1 
/***************************************************************************
2 
 *             __________               __   ___.
3 
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
4 
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
5 
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
6 
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
7 
 *                     \/            \/     \/    \/            \/
8 
 * $Id: file.c 26191 2010-05-20 12:59:12Z funman $
9 
 *
10 
 * Copyright (C) 2002 by Björn Stenberg
11 
 *
12 
 * This program is free software; you can redistribute it and/or
13 
 * modify it under the terms of the GNU General Public License
14 
 * as published by the Free Software Foundation; either version 2
15 
 * of the License, or (at your option) any later version.
16 
 *
17 
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 
 * KIND, either express or implied.
19 
 *
20 
 ****************************************************************************/
21 
#include "global.h"
114 theseven 22 
#include "libc/include/errno.h"
23 
#include "libc/include/string.h"
69 theseven 24 
#include "file.h"
25 
#include "fat.h"
26 
#include "dir.h"
27 
#include "util.h"
429 theseven 28 
#include "thread.h"
69 theseven 29 
 
30 
/*
31 
  These functions provide a roughly POSIX-compatible file IO API.
32 
 
33 
  Since the fat32 driver only manages sectors, we maintain a one-sector
34 
  cache for each open file. This way we can provide byte access without
35 
  having to re-read the sector each time.
36 
  The penalty is the RAM used for the cache and slightly more complex code.
37 
*/
38 
 
39 
struct filedesc {
433 theseven 40 
    unsigned char cache[SECTOR_SIZE];
69 theseven 41 
    int cacheoffset; /* invariant: 0 <= cacheoffset <= SECTOR_SIZE */
42 
    long fileoffset;
43 
    long size;
44 
    int attr;
45 
    struct fat_file fatfile;
433 theseven 46 
    struct filedesc* next;
47 
    struct scheduler_thread* process;
69 theseven 48 
    bool write;
49 
    bool dirty;
50 
    bool trunc;
433 theseven 51 
};
69 theseven 52 
 
433 theseven 53 
static struct mutex file_mutex;
54 
static struct filedesc* openfiles;
69 theseven 55 
 
56 
static int flush_cache(int fd);
57 
 
58 
int file_creat(const char *pathname)
59 
{
60 
    return open(pathname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
61 
}
62 
 
63 
static int open_internal(const char* pathname, int flags, bool use_cache)
64 
{
65 
    DIR* dir;
66 
    struct dirent* entry;
67 
    char pathnamecopy[MAX_PATH];
68 
    char* name;
433 theseven 69 
    struct filedesc* file;
69 theseven 70 
    int rc;
71 
 
72 
    DEBUGF("open(\"%s\",%d)",pathname,flags);
73 
 
74 
    if ( pathname[0] != '/' ) {
75 
        DEBUGF("'%s' is not an absolute path.", pathname);
76 
        DEBUGF("Only absolute pathnames supported at the moment");
77 
        errno = EINVAL;
78 
        return -1;
79 
    }
80 
 
433 theseven 81 
    file = (struct filedesc*)memalign(0x10, sizeof(struct filedesc));
82 
    if (!file)
83 
    {
69 theseven 84 
        errno = EMFILE;
85 
        return -2;
86 
    }
87 
    memset(file, 0, sizeof(struct filedesc));
433 theseven 88 
    file->process = current_thread;
69 theseven 89 
    if (flags & (O_RDWR | O_WRONLY)) {
90 
        file->write = true;
91 
 
92 
        if (flags & O_TRUNC)
93 
            file->trunc = true;
94 
    }
95 
 
96 
    strlcpy(pathnamecopy, pathname, sizeof(pathnamecopy));
97 
 
98 
    /* locate filename */
99 
    name=strrchr(pathnamecopy+1,'/');
100 
    if ( name ) {
101 
        *name = 0;
102 
        dir = opendir(pathnamecopy);
103 
        *name = '/';
104 
        name++;
105 
    }
106 
    else {
107 
        dir = opendir("/");
108 
        name = pathnamecopy+1;
109 
    }
110 
    if (!dir) {
111 
        DEBUGF("Failed opening dir");
112 
        errno = EIO;
433 theseven 113 
        free(file);
69 theseven 114 
        return -4;
115 
    }
116 
 
117 
    if(name[0] == 0) {
118 
        DEBUGF("Empty file name");
119 
        errno = EINVAL;
433 theseven 120 
        free(file);
69 theseven 121 
        closedir(dir);
122 
        return -5;
123 
    }
124 
 
125 
    /* scan dir for name */
126 
    while ((entry = readdir(dir))) {
127 
        if ( !strcasecmp(name, entry->d_name) ) {
128 
            fat_open(IF_MV2(dir->fatdir.file.volume,)
129 
                     entry->startcluster,
130 
                     &(file->fatfile),
131 
                     &(dir->fatdir));
132 
            file->size = file->trunc ? 0 : entry->size;
133 
            file->attr = entry->attribute;
134 
            break;
135 
        }
136 
    }
137 
 
138 
    if ( !entry ) {
139 
        DEBUGF("Didn't find file %s",name);
140 
        if ( file->write && (flags & O_CREAT) ) {
141 
            rc = fat_create_file(name,
142 
                                 &(file->fatfile),
143 
                                 &(dir->fatdir));
144 
            if (rc < 0) {
145 
                DEBUGF("Couldn't create %s in %s",name,pathnamecopy);
146 
                errno = EIO;
433 theseven 147 
                free(file);
69 theseven 148 
                closedir(dir);
149 
                return rc * 10 - 6;
150 
            }
151 
            file->size = 0;
152 
            file->attr = 0;
153 
        }
154 
        else {
155 
            DEBUGF("Couldn't find %s in %s",name,pathnamecopy);
156 
            errno = ENOENT;
433 theseven 157 
            free(file);
69 theseven 158 
            closedir(dir);
159 
            return -7;
160 
        }
161 
    } else {
162 
        if(file->write && (file->attr & FAT_ATTR_DIRECTORY)) {
163 
            errno = EISDIR;
433 theseven 164 
            free(file);
69 theseven 165 
            closedir(dir);
166 
            return -8;
167 
        }
168 
    }
169 
    closedir(dir);
170 
 
171 
    file->cacheoffset = -1;
172 
    file->fileoffset = 0;
173 
 
174 
    if (file->write && (flags & O_APPEND)) {
433 theseven 175 
        rc = lseek((int)file,0,SEEK_END);
69 theseven 176 
        if (rc < 0 )
433 theseven 177 
        {
178 
            free(file);
69 theseven 179 
            return rc * 10 - 9;
433 theseven 180 
        }
69 theseven 181 
    }
182 
 
433 theseven 183 
    mutex_lock(&file_mutex, TIMEOUT_BLOCK);
184 
    file->next = openfiles;
185 
    openfiles = file;
186 
    mutex_unlock(&file_mutex);
187 
 
188 
    return (int)file;
69 theseven 189 
}
190 
 
191 
int file_open(const char* pathname, int flags)
192 
{
193 
    /* By default, use the dircache if available. */
194 
    return open_internal(pathname, flags, true);
195 
}
196 
 
197 
int close(int fd)
198 
{
199 
    int rc = 0;
433 theseven 200 
    struct filedesc* f = (struct filedesc*)fd;
69 theseven 201 
    DEBUGF("close(%d)", fd);
433 theseven 202 
    if (!f)
203 
    {
69 theseven 204 
        errno = EBADF;
205 
        return -2;
206 
    }
433 theseven 207 
    if (f->write)
208 
    {
69 theseven 209 
        rc = fsync(fd);
210 
        if (rc < 0)
211 
            return rc * 10 - 3;
212 
    }
433 theseven 213 
    mutex_lock(&file_mutex, TIMEOUT_BLOCK);
214 
    if (openfiles == f) openfiles = openfiles->next;
215 
    else
216 
        for (f = openfiles; f; f = f->next)
217 
            if ((int)(f->next) == fd)
218 
                f->next = f->next->next;
219 
    mutex_unlock(&file_mutex);
220 
    free((void*)fd);
69 theseven 221 
    return 0;
222 
}
223 
 
224 
int close_all_of_process(struct scheduler_thread* process)
225 
{
433 theseven 226 
    struct filedesc* f;
227 
    struct filedesc* prev;
69 theseven 228 
    int closed = 0;
433 theseven 229 
    mutex_lock(&file_mutex, TIMEOUT_BLOCK);
230 
    while (openfiles && openfiles->process == process)
69 theseven 231 
    {
433 theseven 232 
        prev = openfiles;
233 
        openfiles = openfiles->next;
234 
        if (openfiles->write) fsync((int)openfiles);
235 
        free(prev);
236 
        closed++;
237 
    }
238 
    for (f = openfiles; f; f = f->next)
460 theseven 239 
        while (f->next && f->next->process == process)
69 theseven 240 
        {
460 theseven 241 
            prev = f->next;
242 
            f->next = f->next->next;
243 
            free(prev);
69 theseven 244 
            closed++;
245 
        }
433 theseven 246 
    mutex_unlock(&file_mutex);
69 theseven 247 
    return closed; /* return how many we did */
248 
}
249 
 
250 
int fsync(int fd)
251 
{
433 theseven 252 
    struct filedesc* file = (struct filedesc*)fd;
69 theseven 253 
    int rc = 0;
254 
 
255 
    DEBUGF("fsync(%d)", fd);
256 
 
433 theseven 257 
    if (!file) {
69 theseven 258 
        errno = EBADF;
259 
        return -2;
260 
    }
261 
    if (file->write) {
262 
        /* flush sector cache */
263 
        if ( file->dirty ) {
264 
            rc = flush_cache(fd);
265 
            if (rc < 0)
266 
            {
267 
                /* when failing, try to close the file anyway */
268 
                fat_closewrite(&(file->fatfile), file->size, file->attr);
269 
                return rc * 10 - 3;
270 
            }
271 
        }
272 
 
273 
        /* truncate? */
274 
        if (file->trunc) {
275 
            rc = ftruncate(fd, file->size);
276 
            if (rc < 0)
277 
            {
278 
                /* when failing, try to close the file anyway */
279 
                fat_closewrite(&(file->fatfile), file->size, file->attr);
280 
                return rc * 10 - 4;
281 
            }
282 
        }
283 
 
284 
        /* tie up all loose ends */
285 
        rc = fat_closewrite(&(file->fatfile), file->size, file->attr);
286 
        if (rc < 0)
287 
            return rc * 10 - 5;
288 
    }
289 
    return 0;
290 
}
291 
 
292 
int remove(const char* name)
293 
{
294 
    int rc;
295 
    struct filedesc* file;
296 
    /* Can't use dircache now, because we need to access the fat structures. */
297 
    int fd = open_internal(name, O_WRONLY, false);
298 
    if ( fd < 0 )
299 
        return fd * 10 - 1;
300 
 
301 
    file = &openfiles[fd];
302 
    rc = fat_remove(&(file->fatfile));
303 
    if ( rc < 0 ) {
304 
        DEBUGF("Failed removing file: %d", rc);
305 
        errno = EIO;
306 
        return rc * 10 - 3;
307 
    }
308 
 
309 
    file->size = 0;
310 
 
311 
    rc = close(fd);
312 
    if (rc<0)
313 
        return rc * 10 - 4;
314 
 
315 
    return 0;
316 
}
317 
 
318 
int rename(const char* path, const char* newpath)
319 
{
320 
    int rc, fd;
321 
    DIR* dir;
322 
    char* nameptr;
323 
    char* dirptr;
324 
    struct filedesc* file;
325 
    char newpath2[MAX_PATH];
326 
 
327 
    /* verify new path does not already exist */
328 
    /* If it is a directory, errno == EISDIR if the name exists */
329 
    fd = open(newpath, O_RDONLY);
330 
    if ( fd >= 0 || errno == EISDIR) {
331 
        close(fd);
332 
        errno = EBUSY;
333 
        return -1;
334 
    }
335 
    close(fd);
336 
 
337 
    fd = open_internal(path, O_RDONLY, false);
338 
    if ( fd < 0 ) {
339 
        errno = EIO;
340 
        return fd * 10 - 2;
341 
    }
342 
 
343 
    /* extract new file name */
344 
    nameptr = strrchr(newpath,'/');
345 
    if (nameptr)
346 
        nameptr++;
347 
    else {
348 
        close(fd);
349 
        return - 3;
350 
    }
351 
 
352 
    /* Extract new path */
353 
    strcpy(newpath2, newpath);
354 
 
355 
    dirptr = strrchr(newpath2,'/');
356 
    if(dirptr)
357 
        *dirptr = 0;
358 
    else {
359 
        close(fd);
360 
        return - 4;
361 
    }
362 
 
363 
    dirptr = newpath2;
364 
 
365 
    if(strlen(dirptr) == 0) {
366 
        dirptr = "/";
367 
    }
368 
 
369 
    dir = opendir(dirptr);
370 
    if(!dir) {
371 
        close(fd);
372 
        return - 5;
373 
    }
374 
 
433 theseven 375 
    file = (struct filedesc*)fd;
69 theseven 376 
 
377 
    rc = fat_rename(&file->fatfile, &dir->fatdir, nameptr,
378 
                    file->size, file->attr);
379 
#ifdef HAVE_MULTIVOLUME
380 
    if ( rc == -1) {
381 
        close(fd);
382 
        closedir(dir);
383 
        DEBUGF("Failed renaming file across volumnes: %d", rc);
384 
        errno = EXDEV;
385 
        return -6;
386 
    }
387 
#endif
388 
    if ( rc < 0 ) {
389 
        close(fd);
390 
        closedir(dir);
391 
        DEBUGF("Failed renaming file: %d", rc);
392 
        errno = EIO;
393 
        return rc * 10 - 7;
394 
    }
395 
 
396 
    rc = close(fd);
397 
    if (rc<0) {
398 
        closedir(dir);
399 
        errno = EIO;
400 
        return rc * 10 - 8;
401 
    }
402 
 
403 
    rc = closedir(dir);
404 
    if (rc<0) {
405 
        errno = EIO;
406 
        return rc * 10 - 9;
407 
    }
408 
 
409 
    return 0;
410 
}
411 
 
412 
int ftruncate(int fd, off_t size)
413 
{
414 
    int rc, sector;
433 theseven 415 
    struct filedesc* file = (struct filedesc*)fd;
69 theseven 416 
 
417 
    sector = size / SECTOR_SIZE;
418 
    if (size % SECTOR_SIZE)
419 
        sector++;
420 
 
421 
    rc = fat_seek(&(file->fatfile), sector);
422 
    if (rc < 0) {
423 
        errno = EIO;
424 
        return rc * 10 - 1;
425 
    }
426 
 
427 
    rc = fat_truncate(&(file->fatfile));
428 
    if (rc < 0) {
429 
        errno = EIO;
430 
        return rc * 10 - 2;
431 
    }
432 
 
433 
    file->size = size;
434 
 
435 
    return 0;
436 
}
437 
 
438 
static int flush_cache(int fd)
439 
{
440 
    int rc;
433 theseven 441 
    struct filedesc* file = (struct filedesc*)fd;
69 theseven 442 
    long sector = file->fileoffset / SECTOR_SIZE;
443 
 
444 
    DEBUGF("Flushing dirty sector cache");
445 
 
446 
    /* make sure we are on correct sector */
447 
    rc = fat_seek(&(file->fatfile), sector);
448 
    if ( rc < 0 )
449 
        return rc * 10 - 3;
450 
 
451 
    rc = fat_readwrite(&(file->fatfile), 1, file->cache, true );
452 
 
453 
    if ( rc < 0 ) {
454 
        if(file->fatfile.eof)
455 
            errno = ENOSPC;
456 
 
457 
        return rc * 10 - 2;
458 
    }
459 
 
460 
    file->dirty = false;
461 
 
462 
    return 0;
463 
}
464 
 
465 
static int readwrite(int fd, void* buf, long count, bool write)
466 
{
467 
    long sectors;
120 theseven 468 
    long i;
69 theseven 469 
    long nread=0;
470 
    struct filedesc* file;
120 theseven 471 
    int rc, rc2;
69 theseven 472 
 
433 theseven 473 
    file = (struct filedesc*)fd;
69 theseven 474 
 
433 theseven 475 
    if (!file) {
69 theseven 476 
        errno = EBADF;
477 
        return -1;
478 
    }
479 
 
480 
    if(file->attr & FAT_ATTR_DIRECTORY) {
481 
        errno = EISDIR;
482 
        return -1;
483 
    }
484 
 
485 
    DEBUGF( "readwrite(%d,%lx,%ld,%s)",
486 
             fd,(long)buf,count,write?"write":"read");
487 
 
488 
    /* attempt to read past EOF? */
489 
    if (!write && count > file->size - file->fileoffset)
490 
        count = file->size - file->fileoffset;
491 
 
492 
    /* any head bytes? */
493 
    if ( file->cacheoffset != -1 ) {
494 
        int offs = file->cacheoffset;
495 
        int headbytes = MIN(count, SECTOR_SIZE - offs);
496 
 
497 
        if (write) {
498 
            memcpy( file->cache + offs, buf, headbytes );
499 
            file->dirty = true;
500 
        }
501 
        else {
502 
            memcpy( buf, file->cache + offs, headbytes );
503 
        }
504 
 
505 
        if (offs + headbytes == SECTOR_SIZE) {
506 
            if (file->dirty) {
507 
                rc = flush_cache(fd);
508 
                if ( rc < 0 ) {
509 
                    errno = EIO;
510 
                    return rc * 10 - 2;
511 
                }
512 
            }
513 
            file->cacheoffset = -1;
514 
        }
515 
        else {
516 
            file->cacheoffset += headbytes;
517 
        }
518 
 
519 
        nread = headbytes;
520 
        count -= headbytes;
521 
    }
522 
 
523 
    /* If the buffer has been modified, either it has been flushed already
524 
     * (if (offs+headbytes == SECTOR_SIZE)...) or does not need to be (no
525 
     * more data to follow in this call). Do NOT flush here. */
526 
 
527 
    /* read/write whole sectors right into/from the supplied buffer */
528 
    sectors = count / SECTOR_SIZE;
120 theseven 529 
    rc = 0;
69 theseven 530 
    if ( sectors ) {
70 theseven 531 
        if (((uint32_t)buf + nread) & (CACHEALIGN_SIZE - 1))
120 theseven 532 
            for (i = 0; i < sectors; i++)
533 
            {
534 
                if (write) memcpy(file->cache, buf+nread+i*SECTOR_SIZE, SECTOR_SIZE);
535 
                rc2 = fat_readwrite(&(file->fatfile), 1, file->cache, write );
536 
                if (rc2 < 0)
537 
                {
538 
                    rc = rc2;
539 
                    break;
540 
                }
541 
                else rc += rc2;
542 
                if (!write) memcpy(buf+nread+i*SECTOR_SIZE, file->cache, SECTOR_SIZE);
543 
            }
69 theseven 544 
        else rc = fat_readwrite(&(file->fatfile), sectors, (unsigned char*)buf+nread, write );
545 
        if ( rc < 0 ) {
546 
            DEBUGF("Failed read/writing %ld sectors",sectors);
547 
            errno = EIO;
548 
            if(write && file->fatfile.eof) {
549 
                DEBUGF("No space left on device");
550 
                errno = ENOSPC;
551 
            } else {
552 
                file->fileoffset += nread;
553 
            }
554 
            file->cacheoffset = -1;
555 
            /* adjust file size to length written */
556 
            if ( write && file->fileoffset > file->size )
557 
            {
558 
                file->size = file->fileoffset;
559 
            }
560 
            return nread ? nread : rc * 10 - 4;
561 
        }
562 
        else {
563 
            if ( rc > 0 ) {
564 
                nread += rc * SECTOR_SIZE;
565 
                count -= sectors * SECTOR_SIZE;
566 
 
567 
                /* if eof, skip tail bytes */
568 
                if ( rc < sectors )
569 
                    count = 0;
570 
            }
571 
            else {
572 
                /* eof */
573 
                count=0;
574 
            }
575 
 
576 
            file->cacheoffset = -1;
577 
        }
578 
    }
579 
 
580 
    /* any tail bytes? */
581 
    if ( count ) {
582 
        if (write) {
583 
            if ( file->fileoffset + nread < file->size ) {
584 
                /* sector is only partially filled. copy-back from disk */
585 
                DEBUGF("Copy-back tail cache");
586 
                rc = fat_readwrite(&(file->fatfile), 1, file->cache, false );
587 
                if ( rc < 0 ) {
588 
                    DEBUGF("Failed writing");
589 
                    errno = EIO;
590 
                    file->fileoffset += nread;
591 
                    file->cacheoffset = -1;
592 
                    /* adjust file size to length written */
593 
                    if ( file->fileoffset > file->size )
594 
                    {
595 
                        file->size = file->fileoffset;
596 
                    }
597 
                    return nread ? nread : rc * 10 - 5;
598 
                }
599 
                /* seek back one sector to put file position right */
600 
                rc = fat_seek(&(file->fatfile),
601 
                              (file->fileoffset + nread) /
602 
                              SECTOR_SIZE);
603 
                if ( rc < 0 ) {
604 
                    DEBUGF("fat_seek() failed");
605 
                    errno = EIO;
606 
                    file->fileoffset += nread;
607 
                    file->cacheoffset = -1;
608 
                    /* adjust file size to length written */
609 
                    if ( file->fileoffset > file->size )
610 
                    {
611 
                        file->size = file->fileoffset;
612 
                    }
613 
                    return nread ? nread : rc * 10 - 6;
614 
                }
615 
            }
616 
            memcpy( file->cache, (unsigned char*)buf + nread, count );
617 
            file->dirty = true;
618 
        }
619 
        else {
620 
            rc = fat_readwrite(&(file->fatfile), 1, file->cache,false);
621 
            if (rc < 1 ) {
622 
                DEBUGF("Failed caching sector");
623 
                errno = EIO;
624 
                file->fileoffset += nread;
625 
                file->cacheoffset = -1;
626 
                return nread ? nread : rc * 10 - 7;
627 
            }
628 
            memcpy( (unsigned char*)buf + nread, file->cache, count );
629 
        }
630 
 
631 
        nread += count;
632 
        file->cacheoffset = count;
633 
    }
634 
 
635 
    file->fileoffset += nread;
636 
    DEBUGF("fileoffset: %ld", file->fileoffset);
637 
 
638 
    /* adjust file size to length written */
639 
    if ( write && file->fileoffset > file->size )
640 
    {
641 
        file->size = file->fileoffset;
642 
    }
643 
 
644 
    return nread;
645 
}
646 
 
647 
ssize_t write(int fd, const void* buf, size_t count)
648 
{
433 theseven 649 
    if (!((struct filedesc*)fd)->write) {
69 theseven 650 
        errno = EACCES;
651 
        return -1;
652 
    }
653 
    return readwrite(fd, (void *)buf, count, true);
654 
}
655 
 
656 
ssize_t read(int fd, void* buf, size_t count)
657 
{
658 
    return readwrite(fd, buf, count, false);
659 
}
660 
 
661 
 
662 
off_t lseek(int fd, off_t offset, int whence)
663 
{
664 
    off_t pos;
665 
    long newsector;
666 
    long oldsector;
667 
    int sectoroffset;
668 
    int rc;
433 theseven 669 
    struct filedesc* file = (struct filedesc*)fd;
69 theseven 670 
 
671 
    DEBUGF("lseek(%d,%ld,%d)",fd,offset,whence);
672 
 
433 theseven 673 
    if (!file) {
69 theseven 674 
        errno = EBADF;
675 
        return -1;
676 
    }
677 
 
678 
    switch ( whence ) {
679 
        case SEEK_SET:
680 
            pos = offset;
681 
            break;
682 
 
683 
        case SEEK_CUR:
684 
            pos = file->fileoffset + offset;
685 
            break;
686 
 
687 
        case SEEK_END:
688 
            pos = file->size + offset;
689 
            break;
690 
 
691 
        default:
692 
            errno = EINVAL;
693 
            return -2;
694 
    }
695 
    if ((pos < 0) || (pos > file->size)) {
696 
        errno = EINVAL;
697 
        return -3;
698 
    }
699 
 
700 
    /* new sector? */
701 
    newsector = pos / SECTOR_SIZE;
702 
    oldsector = file->fileoffset / SECTOR_SIZE;
703 
    sectoroffset = pos % SECTOR_SIZE;
704 
 
705 
    if ( (newsector != oldsector) ||
706 
         ((file->cacheoffset==-1) && sectoroffset) ) {
707 
 
708 
        if ( newsector != oldsector ) {
709 
            if (file->dirty) {
710 
                rc = flush_cache(fd);
711 
                if (rc < 0)
712 
                    return rc * 10 - 5;
713 
            }
714 
 
715 
            rc = fat_seek(&(file->fatfile), newsector);
716 
            if ( rc < 0 ) {
717 
                errno = EIO;
718 
                return rc * 10 - 4;
719 
            }
720 
        }
721 
        if ( sectoroffset ) {
722 
            rc = fat_readwrite(&(file->fatfile), 1, file->cache ,false);
723 
            if ( rc < 0 ) {
724 
                errno = EIO;
725 
                return rc * 10 - 6;
726 
            }
727 
            file->cacheoffset = sectoroffset;
728 
        }
729 
        else
730 
            file->cacheoffset = -1;
731 
    }
732 
    else
733 
        if ( file->cacheoffset != -1 )
734 
            file->cacheoffset = sectoroffset;
735 
 
736 
    file->fileoffset = pos;
737 
 
738 
    return pos;
739 
}
740 
 
741 
off_t filesize(int fd)
742 
{
433 theseven 743 
    struct filedesc* file = (struct filedesc*)fd;
69 theseven 744 
 
433 theseven 745 
    if (!file) {
69 theseven 746 
        errno = EBADF;
747 
        return -1;
748 
    }
749 
 
750 
    return file->size;
751 
}
752 
 
753 
 
754 
#ifdef HAVE_HOTSWAP
755 
/* release all file handles on a given volume "by force", to avoid leaks */
756 
int release_files(int volume)
757 
{
433 theseven 758 
    struct filedesc* prev;
69 theseven 759 
    int closed = 0;
433 theseven 760 
    mutex_lock(&file_mutex, TIMEOUT_BLOCK);
761 
#ifdef HAVE_MULTIVOLUME
762 
    struct filedesc* f;
763 
    while (openfiles && openfiles->fatfile.volume == volume)
69 theseven 764 
    {
433 theseven 765 
        prev = openfiles;
766 
        openfiles = openfiles->next;
767 
        free(prev);
768 
        closed++;
769 
    }
770 
    for (f = openfiles; f; f = f->next)
460 theseven 771 
        while (f->next && f->next->fatfile.volume == volume)
69 theseven 772 
        {
460 theseven 773 
            prev = f->next;
774 
            f->next = f->next->next;
775 
            free(prev);
69 theseven 776 
            closed++;
777 
        }
433 theseven 778 
#else
779 
    (void)volume;
780 
    while (openfiles)
781 
    {
782 
        prev = openfiles;
783 
        openfiles = openfiles->next;
784 
        free(prev);
785 
        closed++;
786 
    }
787 
#endif
788 
    mutex_unlock(&file_mutex);
69 theseven 789 
    return closed; /* return how many we did */
790 
}
791 
#endif /* #ifdef HAVE_HOTSWAP */