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-rw-r--r--include/linux/msdos_fs.h281
1 files changed, 2 insertions, 279 deletions
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
index ba63858056c7..e0a9b207920d 100644
--- a/include/linux/msdos_fs.h
+++ b/include/linux/msdos_fs.h
@@ -46,11 +46,6 @@
46#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ 46#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
47#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) 47#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
48 48
49/* valid file mode bits */
50#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
51/* Convert attribute bits and a mask to the UNIX mode. */
52#define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
53
54#define MSDOS_NAME 11 /* maximum name length */ 49#define MSDOS_NAME 11 /* maximum name length */
55#define MSDOS_LONGNAME 256 /* maximum name length */ 50#define MSDOS_LONGNAME 256 /* maximum name length */
56#define MSDOS_SLOTS 21 /* max # of slots for short and long names */ 51#define MSDOS_SLOTS 21 /* max # of slots for short and long names */
@@ -167,282 +162,10 @@ struct msdos_dir_slot {
167}; 162};
168 163
169#ifdef __KERNEL__ 164#ifdef __KERNEL__
170
171#include <linux/buffer_head.h>
172#include <linux/string.h>
173#include <linux/nls.h>
174#include <linux/fs.h>
175#include <linux/mutex.h>
176
177/*
178 * vfat shortname flags
179 */
180#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
181#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
182#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
183#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
184#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
185
186struct fat_mount_options {
187 uid_t fs_uid;
188 gid_t fs_gid;
189 unsigned short fs_fmask;
190 unsigned short fs_dmask;
191 unsigned short codepage; /* Codepage for shortname conversions */
192 char *iocharset; /* Charset used for filename input/display */
193 unsigned short shortname; /* flags for shortname display/create rule */
194 unsigned char name_check; /* r = relaxed, n = normal, s = strict */
195 unsigned short allow_utime;/* permission for setting the [am]time */
196 unsigned quiet:1, /* set = fake successful chmods and chowns */
197 showexec:1, /* set = only set x bit for com/exe/bat */
198 sys_immutable:1, /* set = system files are immutable */
199 dotsOK:1, /* set = hidden and system files are named '.filename' */
200 isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
201 utf8:1, /* Use of UTF-8 character set (Default) */
202 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
203 numtail:1, /* Does first alias have a numeric '~1' type tail? */
204 flush:1, /* write things quickly */
205 nocase:1, /* Does this need case conversion? 0=need case conversion*/
206 usefree:1, /* Use free_clusters for FAT32 */
207 tz_utc:1; /* Filesystem timestamps are in UTC */
208};
209
210#define FAT_HASH_BITS 8
211#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
212#define FAT_HASH_MASK (FAT_HASH_SIZE-1)
213
214/*
215 * MS-DOS file system in-core superblock data
216 */
217struct msdos_sb_info {
218 unsigned short sec_per_clus; /* sectors/cluster */
219 unsigned short cluster_bits; /* log2(cluster_size) */
220 unsigned int cluster_size; /* cluster size */
221 unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
222 unsigned short fat_start;
223 unsigned long fat_length; /* FAT start & length (sec.) */
224 unsigned long dir_start;
225 unsigned short dir_entries; /* root dir start & entries */
226 unsigned long data_start; /* first data sector */
227 unsigned long max_cluster; /* maximum cluster number */
228 unsigned long root_cluster; /* first cluster of the root directory */
229 unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
230 struct mutex fat_lock;
231 unsigned int prev_free; /* previously allocated cluster number */
232 unsigned int free_clusters; /* -1 if undefined */
233 unsigned int free_clus_valid; /* is free_clusters valid? */
234 struct fat_mount_options options;
235 struct nls_table *nls_disk; /* Codepage used on disk */
236 struct nls_table *nls_io; /* Charset used for input and display */
237 const void *dir_ops; /* Opaque; default directory operations */
238 int dir_per_block; /* dir entries per block */
239 int dir_per_block_bits; /* log2(dir_per_block) */
240
241 int fatent_shift;
242 struct fatent_operations *fatent_ops;
243
244 spinlock_t inode_hash_lock;
245 struct hlist_head inode_hashtable[FAT_HASH_SIZE];
246};
247
248#define FAT_CACHE_VALID 0 /* special case for valid cache */
249
250/*
251 * MS-DOS file system inode data in memory
252 */
253struct msdos_inode_info {
254 spinlock_t cache_lru_lock;
255 struct list_head cache_lru;
256 int nr_caches;
257 /* for avoiding the race between fat_free() and fat_get_cluster() */
258 unsigned int cache_valid_id;
259
260 loff_t mmu_private;
261 int i_start; /* first cluster or 0 */
262 int i_logstart; /* logical first cluster */
263 int i_attrs; /* unused attribute bits */
264 loff_t i_pos; /* on-disk position of directory entry or 0 */
265 struct hlist_node i_fat_hash; /* hash by i_location */
266 struct inode vfs_inode;
267};
268
269struct fat_slot_info {
270 loff_t i_pos; /* on-disk position of directory entry */
271 loff_t slot_off; /* offset for slot or de start */
272 int nr_slots; /* number of slots + 1(de) in filename */
273 struct msdos_dir_entry *de;
274 struct buffer_head *bh;
275};
276
277static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
278{
279 return sb->s_fs_info;
280}
281
282static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
283{
284 return container_of(inode, struct msdos_inode_info, vfs_inode);
285}
286
287/* Return the FAT attribute byte for this inode */
288static inline u8 fat_attr(struct inode *inode)
289{
290 return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
291 (S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |
292 MSDOS_I(inode)->i_attrs;
293}
294
295static inline unsigned char fat_checksum(const __u8 *name)
296{
297 unsigned char s = name[0];
298 s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
299 s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
300 s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
301 s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
302 s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
303 return s;
304}
305
306static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
307{
308 return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
309 + sbi->data_start;
310}
311
312static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
313{
314#ifdef __BIG_ENDIAN
315 while (len--) {
316 *dst++ = src[0] | (src[1] << 8);
317 src += 2;
318 }
319#else
320 memcpy(dst, src, len * 2);
321#endif
322}
323
324static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
325{
326#ifdef __BIG_ENDIAN
327 while (len--) {
328 dst[0] = *src & 0x00FF;
329 dst[1] = (*src & 0xFF00) >> 8;
330 dst += 2;
331 src++;
332 }
333#else
334 memcpy(dst, src, len * 2);
335#endif
336}
337
338/* media of boot sector */ 165/* media of boot sector */
339static inline int fat_valid_media(u8 media) 166static inline int fat_valid_media(u8 media)
340{ 167{
341 return 0xf8 <= media || media == 0xf0; 168 return 0xf8 <= media || media == 0xf0;
342} 169}
343 170#endif /* !__KERNEL__ */
344/* fat/cache.c */ 171#endif /* !_LINUX_MSDOS_FS_H */
345extern void fat_cache_inval_inode(struct inode *inode);
346extern int fat_get_cluster(struct inode *inode, int cluster,
347 int *fclus, int *dclus);
348extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
349 unsigned long *mapped_blocks);
350
351/* fat/dir.c */
352extern const struct file_operations fat_dir_operations;
353extern int fat_search_long(struct inode *inode, const unsigned char *name,
354 int name_len, struct fat_slot_info *sinfo);
355extern int fat_dir_empty(struct inode *dir);
356extern int fat_subdirs(struct inode *dir);
357extern int fat_scan(struct inode *dir, const unsigned char *name,
358 struct fat_slot_info *sinfo);
359extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
360 struct msdos_dir_entry **de, loff_t *i_pos);
361extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
362extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
363 struct fat_slot_info *sinfo);
364extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
365
366/* fat/fatent.c */
367struct fat_entry {
368 int entry;
369 union {
370 u8 *ent12_p[2];
371 __le16 *ent16_p;
372 __le32 *ent32_p;
373 } u;
374 int nr_bhs;
375 struct buffer_head *bhs[2];
376};
377
378static inline void fatent_init(struct fat_entry *fatent)
379{
380 fatent->nr_bhs = 0;
381 fatent->entry = 0;
382 fatent->u.ent32_p = NULL;
383 fatent->bhs[0] = fatent->bhs[1] = NULL;
384}
385
386static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
387{
388 fatent->entry = entry;
389 fatent->u.ent32_p = NULL;
390}
391
392static inline void fatent_brelse(struct fat_entry *fatent)
393{
394 int i;
395 fatent->u.ent32_p = NULL;
396 for (i = 0; i < fatent->nr_bhs; i++)
397 brelse(fatent->bhs[i]);
398 fatent->nr_bhs = 0;
399 fatent->bhs[0] = fatent->bhs[1] = NULL;
400}
401
402extern void fat_ent_access_init(struct super_block *sb);
403extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
404 int entry);
405extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
406 int new, int wait);
407extern int fat_alloc_clusters(struct inode *inode, int *cluster,
408 int nr_cluster);
409extern int fat_free_clusters(struct inode *inode, int cluster);
410extern int fat_count_free_clusters(struct super_block *sb);
411
412/* fat/file.c */
413extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
414 unsigned int cmd, unsigned long arg);
415extern const struct file_operations fat_file_operations;
416extern const struct inode_operations fat_file_inode_operations;
417extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
418extern void fat_truncate(struct inode *inode);
419extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
420 struct kstat *stat);
421
422/* fat/inode.c */
423extern void fat_attach(struct inode *inode, loff_t i_pos);
424extern void fat_detach(struct inode *inode);
425extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
426extern struct inode *fat_build_inode(struct super_block *sb,
427 struct msdos_dir_entry *de, loff_t i_pos);
428extern int fat_sync_inode(struct inode *inode);
429extern int fat_fill_super(struct super_block *sb, void *data, int silent,
430 const struct inode_operations *fs_dir_inode_ops, int isvfat);
431
432extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
433 struct inode *i2);
434/* fat/misc.c */
435extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
436extern void fat_clusters_flush(struct super_block *sb);
437extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
438extern int date_dos2unix(unsigned short time, unsigned short date, int tz_utc);
439extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date,
440 int tz_utc);
441extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
442
443int fat_cache_init(void);
444void fat_cache_destroy(void);
445
446#endif /* __KERNEL__ */
447
448#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-26 17:02:05 -0500