source: rtems/cpukit/libfs/src/dosfs/fat.h @ 0ec9bbc

5
Last change on this file since 0ec9bbc was fae59c9, checked in by Sebastian Huber <sebastian.huber@…>, on 09/06/17 at 08:12:06

dosfs: Support a cluster size of 64KiB

Close #3003.

  • Property mode set to 100644
File size: 18.9 KB
Line 
1/**
2 * @file
3 *
4 * @brief Constants/Data Structures/Prototypes on a Volume with FAT Filesystem
5 *
6 * @ingroup libfs_dosfs
7 *
8 * Constants/Data Structures/Prototypes for Low-Level
9 * Operations on a Volume with FAT Filesystem
10 */
11
12/*
13 *
14 *  Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
15 *  Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru>
16 *
17 *  The license and distribution terms for this file may be
18 *  found in the file LICENSE in this distribution or at
19 *  http://www.rtems.org/license/LICENSE.
20 */
21
22#ifndef __DOSFS_FAT_H__
23#define __DOSFS_FAT_H__
24
25#include <sys/param.h>
26#include <sys/endian.h>
27#include <string.h>
28
29#include <rtems/seterr.h>
30
31#include <errno.h>
32#include <rtems/bdbuf.h>
33
34/**
35 *  @defgroup libfs_dosfs FAT FileSystem
36 *
37 *  @ingroup libfs
38 */
39/**@{*/
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44#ifndef RC_OK
45#define RC_OK 0
46#endif
47
48/*
49 * Remember that all FAT file system on disk data structure is
50 * "little endian"!
51 * (derived from linux)
52 */
53/*
54 * Conversion from and to little-endian byte order. (no-op on i386/i486)
55 *
56 * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
57 * BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
58 */
59#define CF_LE_W(v) le16toh(v)
60#define CF_LE_L(v) le32toh(v)
61#define CT_LE_W(v) htole16(v)
62#define CT_LE_L(v) htole32(v)
63
64#define FAT_HASH_SIZE   2
65#define FAT_HASH_MODULE FAT_HASH_SIZE
66
67
68#define FAT_SECTOR512_SIZE     512 /* sector size (bytes) */
69#define FAT_SECTOR512_BITS       9 /* log2(SECTOR_SIZE) */
70
71/* maximum + 1 number of clusters for FAT12 */
72#define FAT_FAT12_MAX_CLN      4085
73
74/* maximum + 1 number of clusters for FAT16 */
75#define FAT_FAT16_MAX_CLN      65525
76
77#define FAT_FAT12              0x01
78#define FAT_FAT16              0x02
79#define FAT_FAT32              0x04
80
81#define FAT_UNDEFINED_VALUE     (uint32_t)0xFFFFFFFF
82
83#define FAT_FAT12_EOC          0x0FF8
84#define FAT_FAT16_EOC          0xFFF8
85#define FAT_FAT32_EOC          (uint32_t)0x0FFFFFF8
86
87#define FAT_FAT12_FREE         0x0000
88#define FAT_FAT16_FREE         0x0000
89#define FAT_FAT32_FREE         0x00000000
90
91#define FAT_GENFAT_EOC         (uint32_t)0xFFFFFFFF
92#define FAT_GENFAT_FREE        (uint32_t)0x00000000
93
94#define FAT_FAT12_SHIFT        0x04
95
96#define FAT_FAT12_MASK         0x00000FFF
97#define FAT_FAT16_MASK         0x0000FFFF
98#define FAT_FAT32_MASK         (uint32_t)0x0FFFFFFF
99
100#define FAT_MAX_BPB_SIZE       90
101#define FAT_TOTAL_MBR_SIZE    512
102
103/* size of useful information in FSInfo sector */
104#define FAT_USEFUL_INFO_SIZE   12
105
106#define FAT_GET_ADDR(x, ofs)       ((uint8_t *)(x) + (ofs))
107
108#define FAT_GET_VAL8(x, ofs)       (uint8_t)(*((uint8_t *)(x) + (ofs)))
109
110#define FAT_GET_VAL16(x, ofs)                               \
111    (uint16_t)( (*((uint8_t *)(x) + (ofs))) |           \
112                  ((*((uint8_t *)(x) + (ofs) + 1)) << 8) )
113
114#define FAT_GET_VAL32(x, ofs)                                             \
115    (uint32_t)( (uint32_t)(*((uint8_t *)(x) + (ofs))) |             \
116                  ((uint32_t)(*((uint8_t *)(x) + (ofs) + 1)) << 8)  | \
117                  ((uint32_t)(*((uint8_t *)(x) + (ofs) + 2)) << 16) | \
118                  ((uint32_t)(*((uint8_t *)(x) + (ofs) + 3)) << 24) )
119
120#define FAT_SET_VAL8(x, ofs,val)                    \
121                 (*((uint8_t *)(x)+(ofs))=(uint8_t)(val))
122
123#define FAT_SET_VAL16(x, ofs,val) do {              \
124                 FAT_SET_VAL8((x),(ofs),(val));     \
125                 FAT_SET_VAL8((x),(ofs)+1,(val)>>8);\
126                 } while (0)
127
128#define FAT_SET_VAL32(x, ofs,val) do {               \
129                 uint32_t val1 = val;                \
130                 FAT_SET_VAL16((x),(ofs),(val1)&0xffff);\
131                 FAT_SET_VAL16((x),(ofs)+2,(val1)>>16);\
132                 } while (0)
133
134/* macros to access boot sector fields */
135#define FAT_GET_BR_JMPBOOT(x)                FAT_GET_VAL8( x,  0)
136#define FAT_SET_BR_JMPBOOT(x,val)            FAT_SET_VAL8( x,  0,val)
137
138#define FAT_GET_ADDR_BR_OEMNAME(x)           FAT_GET_ADDR( x,  3)
139#define FAT_BR_OEMNAME_SIZE              (8)
140
141#define FAT_GET_BR_BYTES_PER_SECTOR(x)       FAT_GET_VAL16(x, 11)
142#define FAT_SET_BR_BYTES_PER_SECTOR(x,val)   FAT_SET_VAL16(x, 11,val)
143
144#define FAT_GET_BR_SECTORS_PER_CLUSTER(x)    FAT_GET_VAL8( x, 13)
145#define FAT_SET_BR_SECTORS_PER_CLUSTER(x,val)FAT_SET_VAL8( x, 13,val)
146
147#define FAT_GET_BR_RESERVED_SECTORS_NUM(x)   FAT_GET_VAL16(x, 14)
148#define FAT_SET_BR_RESERVED_SECTORS_NUM(x,val) FAT_SET_VAL16(x, 14,val)
149
150#define FAT_GET_BR_FAT_NUM(x)                FAT_GET_VAL8( x, 16)
151#define FAT_SET_BR_FAT_NUM(x,val)            FAT_SET_VAL8( x, 16,val)
152
153#define FAT_GET_BR_FILES_PER_ROOT_DIR(x)     FAT_GET_VAL16(x, 17)
154#define FAT_SET_BR_FILES_PER_ROOT_DIR(x,val) FAT_SET_VAL16(x, 17,val)
155
156#define FAT_GET_BR_TOTAL_SECTORS_NUM16(x)    FAT_GET_VAL16(x, 19)
157#define FAT_SET_BR_TOTAL_SECTORS_NUM16(x,val)FAT_SET_VAL16(x, 19,val)
158
159#define FAT_GET_BR_MEDIA(x)                  FAT_GET_VAL8( x, 21)
160#define FAT_SET_BR_MEDIA(x,val)              FAT_SET_VAL8( x, 21,val)
161
162#define FAT_GET_BR_SECTORS_PER_FAT(x)        FAT_GET_VAL16(x, 22)
163#define FAT_SET_BR_SECTORS_PER_FAT(x,val)    FAT_SET_VAL16(x, 22,val)
164
165#define FAT_GET_BR_SECTORS_PER_TRACK(x)      FAT_GET_VAL16(x, 24)
166#define FAT_SET_BR_SECTORS_PER_TRACK(x,val)  FAT_SET_VAL16(x, 24,val)
167
168#define FAT_GET_BR_NUMBER_OF_HEADS(x)        FAT_GET_VAL16(x, 26)
169#define FAT_SET_BR_NUMBER_OF_HEADS(x,val)    FAT_SET_VAL16(x, 26,val)
170
171#define FAT_GET_BR_HIDDEN_SECTORS(x)         FAT_GET_VAL32(x, 28)
172#define FAT_SET_BR_HIDDEN_SECTORS(x,val)     FAT_SET_VAL32(x, 28,val)
173
174#define FAT_GET_BR_TOTAL_SECTORS_NUM32(x)    FAT_GET_VAL32(x, 32)
175#define FAT_SET_BR_TOTAL_SECTORS_NUM32(x,val) FAT_SET_VAL32(x, 32,val)
176  /* --- start of FAT12/16 specific fields */
177#define FAT_GET_BR_DRVNUM(x)                 FAT_GET_VAL8( x, 36)
178#define FAT_SET_BR_DRVNUM(x,val)             FAT_SET_VAL8( x, 36,val)
179
180#define FAT_GET_BR_RSVD1(x)                  FAT_GET_VAL8( x, 37)
181#define FAT_SET_BR_RSVD1(x,val)              FAT_SET_VAL8( x, 37,val)
182
183#define FAT_GET_BR_BOOTSIG(x)                FAT_GET_VAL8( x, 38)
184#define FAT_SET_BR_BOOTSIG(x,val)            FAT_SET_VAL8( x, 38,val)
185#define FAT_BR_BOOTSIG_VAL               (0x29)
186
187#define FAT_GET_BR_VOLID(x)                  FAT_GET_VAL32(x, 39)
188#define FAT_SET_BR_VOLID(x,val)              FAT_SET_VAL32(x, 39,val)
189
190#define FAT_GET_ADDR_BR_VOLLAB(x)            FAT_GET_ADDR (x, 43)
191#define FAT_BR_VOLLAB_SIZE               (11)
192
193#define FAT_GET_ADDR_BR_FILSYSTYPE(x)        FAT_GET_ADDR (x, 54)
194#define FAT_BR_FILSYSTYPE_SIZE           (8)
195  /* --- end of FAT12/16 specific fields */
196  /* --- start of FAT32 specific fields */
197#define FAT_GET_BR_SECTORS_PER_FAT32(x)      FAT_GET_VAL32(x, 36)
198#define FAT_SET_BR_SECTORS_PER_FAT32(x,val)  FAT_SET_VAL32(x, 36,val)
199
200#define FAT_GET_BR_EXT_FLAGS(x)              FAT_GET_VAL16(x, 40)
201#define FAT_SET_BR_EXT_FLAGS(x,val)          FAT_SET_VAL16(x, 40,val)
202
203#define FAT_GET_BR_FSVER(x)                  FAT_GET_VAL16(x, 42)
204#define FAT_SET_BR_FSVER(x,val)              FAT_SET_VAL16(x, 42,val)
205
206#define FAT_GET_BR_FAT32_ROOT_CLUSTER(x)     FAT_GET_VAL32(x, 44)
207#define FAT_SET_BR_FAT32_ROOT_CLUSTER(x,val) FAT_SET_VAL32(x, 44,val)
208
209#define FAT_GET_BR_FAT32_FS_INFO_SECTOR(x)   FAT_GET_VAL16(x, 48)
210#define FAT_SET_BR_FAT32_FS_INFO_SECTOR(x,val) FAT_SET_VAL16(x, 48,val)
211
212#define FAT_GET_BR_FAT32_BK_BOOT_SECTOR(x)   FAT_GET_VAL16(x, 50)
213#define FAT_SET_BR_FAT32_BK_BOOT_SECTOR(x,val)  FAT_SET_VAL16(x, 50,val)
214
215#define FAT_GET_ADDR_BR_FAT32_RESERVED(x)    FAT_GET_ADDR (x, 52)
216#define FAT_BR_FAT32_RESERVED_SIZE       (12)
217
218#define FAT_GET_BR_FAT32_DRVNUM(x)           FAT_GET_VAL8( x, 64)
219#define FAT_SET_BR_FAT32_DRVNUM(x,val)       FAT_SET_VAL8( x, 64,val)
220
221#define FAT_GET_BR_FAT32_RSVD1(x)            FAT_GET_VAL8( x, 65)
222#define FAT_SET_BR_FAT32_RSVD1(x,val)        FAT_SET_VAL8( x, 65,val)
223
224#define FAT_GET_BR_FAT32_BOOTSIG(x)          FAT_GET_VAL8( x, 66)
225#define FAT_SET_BR_FAT32_BOOTSIG(x,val)      FAT_SET_VAL8( x, 66,val)
226#define FAT_BR_FAT32_BOOTSIG_VAL         (0x29)
227
228#define FAT_GET_BR_FAT32_VOLID(x)            FAT_GET_VAL32(x, 67)
229#define FAT_SET_BR_FAT32_VOLID(x,val)        FAT_SET_VAL32(x, 67,val)
230
231#define FAT_GET_ADDR_BR_FAT32_VOLLAB(x)      FAT_GET_ADDR (x, 71)
232#define FAT_BR_FAT32_VOLLAB_SIZE         (11)
233
234#define FAT_GET_ADDR_BR_FAT32_FILSYSTYPE(x)  FAT_GET_ADDR (x, 82)
235#define FAT_BR_FAT32_FILSYSTYPE_SIZE     (8)
236  /* --- end of FAT32 specific fields */
237
238#define FAT_GET_BR_SIGNATURE(x)              FAT_GET_VAL16(x,510)
239#define FAT_SET_BR_SIGNATURE(x,val)          FAT_SET_VAL16(x,510,val)
240#define FAT_BR_SIGNATURE_VAL                (0xAA55)
241
242  /*
243   * FAT32 FSINFO description
244   */
245#define FAT_GET_FSINFO_LEAD_SIGNATURE(x)      FAT_GET_VAL32(x,  0)
246#define FAT_SET_FSINFO_LEAD_SIGNATURE(x,val)  FAT_SET_VAL32(x,  0,val)
247#define FAT_FSINFO_LEAD_SIGNATURE_VALUE   (0x41615252)
248
249#define FAT_GET_FSINFO_STRUC_SIGNATURE(x)     FAT_GET_VAL32(x,484)
250#define FAT_SET_FSINFO_STRUC_SIGNATURE(x,val) FAT_SET_VAL32(x,484,val)
251#define FAT_FSINFO_STRUC_SIGNATURE_VALUE  (0x61417272)
252
253#define FAT_GET_FSINFO_TRAIL_SIGNATURE(x)     FAT_GET_VAL32(x,508)
254#define FAT_SET_FSINFO_TRAIL_SIGNATURE(x,val) FAT_SET_VAL32(x,508,val)
255#define FAT_FSINFO_TRAIL_SIGNATURE_VALUE  (0xAA550000)
256/*
257 * I read FSInfo sector from offset 484 to access the information, so offsets
258 * of these fields a relative
259 */
260#define FAT_GET_FSINFO_FREE_CLUSTER_COUNT(x)      FAT_GET_VAL32(x, 4)
261#define FAT_SET_FSINFO_FREE_CLUSTER_COUNT(x,val)  FAT_SET_VAL32(x, 4,val)
262#define FAT_GET_FSINFO_NEXT_FREE_CLUSTER(x)       FAT_GET_VAL32(x, 8)
263#define FAT_SET_FSINFO_NEXT_FREE_CLUSTER(x,val)   FAT_SET_VAL32(x, 8,val)
264
265#define FAT_FSI_INFO                         484
266#define FAT_FSINFO_STRUCT_OFFSET             488
267#define FAT_FSINFO_FREE_CLUSTER_COUNT_OFFSET (FAT_FSINFO_STRUCT_OFFSET+0)
268
269#define FAT_FSINFO_NEXT_FREE_CLUSTER_OFFSET  (FAT_FSINFO_STRUCT_OFFSET+4)
270
271#define FAT_RSRVD_CLN                        0x02
272
273#define FAT_FSI_LEADSIG_SIZE                 0x04
274
275#define FAT_TOTAL_FSINFO_SIZE               512
276
277#define MS_BYTES_PER_CLUSTER_LIMIT           0x10000    /* 64K */
278#define MS_BYTES_PER_CLUSTER_LIMIT_FAT12     0x1000     /*  4K */
279
280#define FAT_BR_EXT_FLAGS_MIRROR              0x0080
281
282#define FAT_BR_EXT_FLAGS_FAT_NUM             0x000F
283
284#define FAT_BR_MEDIA_FIXED                  0xf8
285
286#define FAT_DIRENTRY_SIZE          32
287
288#define FAT_DIRENTRIES_PER_SEC512  16
289
290/*
291 * Volume descriptor
292 * Description of the volume the FAT filesystem is located on - generally
293 * the fields of the structure correspond to Boot Sector and BPB Structure
294 * fields
295 */
296typedef struct fat_vol_s
297{
298    uint16_t           bps;            /* bytes per sector */
299    uint8_t            sec_log2;       /* log2 of bps */
300    uint8_t            sec_mul;        /* log2 of 512bts sectors number per sector */
301    uint8_t            spc;            /* sectors per cluster */
302    uint8_t            spc_log2;       /* log2 of spc */
303    uint32_t           bpc;            /* bytes per cluster */
304    uint8_t            bpc_log2;       /* log2 of bytes per cluster */
305    uint8_t            sectors_per_block;    /* sectors per bdbuf block */
306    uint32_t           bytes_per_block;      /* number of bytes for the bduf block device handling */
307    uint8_t            bytes_per_block_log2; /* log2 of bytes_per_block */
308    uint8_t            fats;           /* number of FATs */
309    uint8_t            type;           /* FAT type */
310    uint32_t           mask;
311    uint32_t           eoc_val;
312    uint16_t           fat_loc;        /* FAT start */
313    uint32_t           fat_length;     /* sectors per FAT */
314    uint32_t           rdir_loc;       /* root directory start */
315    uint16_t           rdir_entrs;     /* files per root directory */
316    uint32_t           rdir_secs;      /* sectors per root directory */
317    uint32_t           rdir_size;      /* root directory size in bytes */
318    uint32_t           tot_secs;       /* total count of sectors */
319    uint32_t           data_fsec;      /* first data sector */
320    uint32_t           data_cls;       /* count of data clusters */
321    uint32_t           rdir_cl;        /* first cluster of the root directory */
322    uint16_t           info_sec;       /* FSInfo Sector Structure location */
323    uint32_t           free_cls;       /* last known free clusters count */
324    uint32_t           free_cls_in_fs_info; /* last known free clusters count
325                                               in FS info sector */
326    uint32_t           next_cl;        /* next free cluster number */
327    uint32_t           next_cl_in_fs_info; /* next free cluster number in FS
328                                              info sector */
329    uint8_t            mirror;         /* mirroring enabla/disable */
330    uint32_t           afat_loc;       /* active FAT location */
331    uint8_t            afat;           /* the number of active FAT */
332    int                fd;             /* the disk device file descriptor */
333    rtems_disk_device *dd;             /* disk device (see libblock) */
334    void              *private_data;   /* reserved */
335} fat_vol_t;
336
337
338typedef struct fat_cache_s
339{
340    uint32_t            blk_num;
341    bool                modified;
342    uint8_t             state;
343    rtems_bdbuf_buffer *buf;
344} fat_cache_t;
345
346/*
347 * This structure identifies the instance of the filesystem on the FAT
348 * ("fat-file") level.
349 */
350typedef struct fat_fs_info_s
351{
352    fat_vol_t            vol;           /* volume descriptor */
353    rtems_chain_control *vhash;         /* "vhash" of fat-file descriptors */
354    rtems_chain_control *rhash;         /* "rhash" of fat-file descriptors */
355    char                *uino;          /* array of unique ino numbers */
356    uint32_t             index;
357    uint32_t             uino_pool_size; /* size */
358    uint32_t             uino_base;
359    fat_cache_t          c;             /* cache */
360    uint8_t             *sec_buf; /* just placeholder for anything */
361} fat_fs_info_t;
362
363/*
364 * FAT position is a the cluster and the offset into the
365 * cluster.
366 */
367typedef struct fat_pos_s
368{
369    uint32_t   cln;
370    uint32_t   ofs;
371} fat_pos_t;
372
373/*
374 * If the name we looking for is file we store not only first data cluster
375 * number, but and cluster number and offset for directory entry for this
376 * name. We also add the LFN start offset so we can delete it the whole
377 * file name. We can then use this to delete the file.
378 */
379typedef struct fat_dir_pos_s
380{
381    fat_pos_t  sname;
382    fat_pos_t  lname;
383} fat_dir_pos_t;
384
385/*
386 * Set the long name entries to this value for a short file name.
387 */
388#define FAT_FILE_SHORT_NAME (0xffffffff)
389
390#define FAT_FAT_OFFSET(fat_type, cln)                  \
391    ((fat_type) & FAT_FAT12 ? ((cln) + ((cln) >> 1)) : \
392     (fat_type) & FAT_FAT16 ? ((cln) << 1)           : \
393     ((cln) << 2))
394
395#define FAT_CLUSTER_IS_ODD(n)  ((n) & 0x0001)
396
397#define FAT12_SHIFT      0x4    /* half of a byte */
398
399/* initial size of array of unique ino */
400#define FAT_UINO_POOL_INIT_SIZE  0x100
401
402/* cache support */
403#define FAT_CACHE_EMPTY   0x0
404#define FAT_CACHE_ACTUAL  0x1
405
406#define FAT_OP_TYPE_READ  0x1
407#define FAT_OP_TYPE_GET   0x2
408
409static inline void
410fat_dir_pos_init(
411    fat_dir_pos_t *dir_pos
412    )
413{
414  dir_pos->sname.cln = 0;
415  dir_pos->sname.ofs = 0;
416  dir_pos->lname.cln = FAT_FILE_SHORT_NAME;
417  dir_pos->lname.ofs = FAT_FILE_SHORT_NAME;
418}
419
420static inline uint32_t
421fat_cluster_num_to_sector_num(
422    const fat_fs_info_t *fs_info,
423    uint32_t             cln
424    )
425{
426    if ( (cln == 0) && (fs_info->vol.type & (FAT_FAT12 | FAT_FAT16)) )
427        return fs_info->vol.rdir_loc;
428
429    return (((cln - FAT_RSRVD_CLN) << fs_info->vol.spc_log2) +
430            fs_info->vol.data_fsec);
431}
432
433static inline uint32_t
434fat_cluster_num_to_sector512_num(
435    const fat_fs_info_t *fs_info,
436    uint32_t             cln
437    )
438{
439    if (cln == 1)
440        return 1;
441
442    return (fat_cluster_num_to_sector_num(fs_info, cln) <<
443            fs_info->vol.sec_mul);
444}
445
446static inline uint32_t
447 fat_block_num_to_cluster_num (const fat_fs_info_t *fs_info,
448                               const uint32_t block_number)
449{
450  return block_number >> (fs_info->vol.bpc_log2 - fs_info->vol.bytes_per_block_log2);
451}
452
453static inline uint32_t
454 fat_block_num_to_sector_num (const fat_fs_info_t *fs_info,
455                              const uint32_t block_number)
456{
457  return block_number << (fs_info->vol.bytes_per_block_log2 - fs_info->vol.sec_log2);
458}
459
460static inline uint32_t
461 fat_sector_num_to_block_num (const fat_fs_info_t *fs_info,
462                              const uint32_t sector_number)
463{
464  return sector_number >> (fs_info->vol.bytes_per_block_log2 - fs_info->vol.sec_log2);
465}
466
467static inline uint32_t
468 fat_sector_offset_to_block_offset (const fat_fs_info_t *fs_info,
469                                    const uint32_t sector,
470                                    const uint32_t sector_offset)
471{
472  return sector_offset +
473           ((sector -
474              fat_block_num_to_sector_num (fs_info,
475                  fat_sector_num_to_block_num (fs_info, sector)))
476            << fs_info->vol.sec_log2);
477}
478
479static inline void
480fat_buf_mark_modified(fat_fs_info_t *fs_info)
481{
482    fs_info->c.modified = true;
483}
484
485int
486fat_buf_access(fat_fs_info_t  *fs_info,
487               uint32_t        sec_num,
488               int             op_type,
489               uint8_t       **sec_buf);
490
491int
492fat_buf_release(fat_fs_info_t *fs_info);
493
494ssize_t
495_fat_block_read(fat_fs_info_t                        *fs_info,
496                uint32_t                              start,
497                uint32_t                              offset,
498                uint32_t                              count,
499                void                                 *buff);
500
501ssize_t
502fat_cluster_write(fat_fs_info_t                    *fs_info,
503                    uint32_t                          start_cln,
504                    uint32_t                          offset,
505                    uint32_t                          count,
506                    const void                       *buff);
507
508ssize_t
509fat_sector_write(fat_fs_info_t                        *fs_info,
510                 uint32_t                              start,
511                 uint32_t                              offset,
512                 uint32_t                              count,
513                 const void                           *buff);
514
515ssize_t
516fat_cluster_set(fat_fs_info_t                        *fs_info,
517                  uint32_t                              start,
518                  uint32_t                              offset,
519                  uint32_t                              count,
520                  uint8_t                               pattern);
521
522
523int
524fat_init_volume_info(fat_fs_info_t *fs_info, const char *device);
525
526int
527fat_init_clusters_chain(fat_fs_info_t                        *fs_info,
528                        uint32_t                              start_cln);
529
530int
531fat_shutdown_drive(fat_fs_info_t *fs_info);
532
533
534uint32_t
535fat_get_unique_ino(fat_fs_info_t *fs_info);
536
537bool
538fat_ino_is_unique(fat_fs_info_t                        *fs_info,
539                  uint32_t                              ino);
540
541void
542fat_free_unique_ino(fat_fs_info_t                        *fs_info,
543                    uint32_t                              ino);
544
545int
546fat_sync(fat_fs_info_t *fs_info);
547
548#ifdef __cplusplus
549}
550#endif
551/**@}*/
552#endif /* __DOSFS_FAT_H__ */
Note: See TracBrowser for help on using the repository browser.