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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / fs / fat / prince-fat / fat-cache-atomic / inode.c
blob328adf46ea8c613174217e6a20fc43fa69463cb8
1 /*
2 * linux/fs/fat/inode.c
3 *
4 * Written 1992,1993 by Werner Almesberger
5 * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
6 * Rewritten for the constant inumbers support by Al Viro
7 *
8 * Fixes:
9 *
10 * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
11 */
12
13 #include <linux/module.h>
14 #include <linux/time.h>
15 #include <linux/slab.h>
16 #include <linux/smp_lock.h>
17 #include <linux/seq_file.h>
18 #include <linux/msdos_fs.h>
19 #include <linux/pagemap.h>
20 #include <linux/buffer_head.h>
21 #include <linux/mount.h>
22 #include <linux/vfs.h>
23 #include <linux/parser.h>
24 #include <asm/unaligned.h>
25
26 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
27 /* if user don't select VFAT, this is undefined. */
28 #define CONFIG_FAT_DEFAULT_IOCHARSET ""
29 #endif
30
31 static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
32 static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
33
34 /*
35 * New FAT inode stuff. We do the following:
36 * a) i_ino is constant and has nothing with on-disk location.
37 * b) FAT manages its own cache of directory entries.
38 * c) *This* cache is indexed by on-disk location.
39 * d) inode has an associated directory entry, all right, but
40 * it may be unhashed.
41 * e) currently entries are stored within struct inode. That should
42 * change.
43 * f) we deal with races in the following way:
44 * 1. readdir() and lookup() do FAT-dir-cache lookup.
45 * 2. rename() unhashes the F-d-c entry and rehashes it in
46 * a new place.
47 * 3. unlink() and rmdir() unhash F-d-c entry.
48 * 4. fat_write_inode() checks whether the thing is unhashed.
49 * If it is we silently return. If it isn't we do bread(),
50 * check if the location is still valid and retry if it
51 * isn't. Otherwise we do changes.
52 * 5. Spinlock is used to protect hash/unhash/location check/lookup
53 * 6. fat_clear_inode() unhashes the F-d-c entry.
54 * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
55 * and consider negative result as cache miss.
56 */
57
58 #define FAT_HASH_BITS 8
59 #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
60 #define FAT_HASH_MASK (FAT_HASH_SIZE-1)
61 static struct list_head fat_inode_hashtable[FAT_HASH_SIZE];
62 static spinlock_t fat_inode_lock = SPIN_LOCK_UNLOCKED;
63
64 void fat_hash_init(void)
65 {
66 int i;
67 for(i = 0; i < FAT_HASH_SIZE; i++) {
68 INIT_LIST_HEAD(&fat_inode_hashtable[i]);
69 }
70 }
71
72 static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos)
73 {
74 unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb;
75 tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2);
76 return tmp & FAT_HASH_MASK;
77 }
78
79 void fat_attach(struct inode *inode, loff_t i_pos)
80 {
81 spin_lock(&fat_inode_lock);
82 MSDOS_I(inode)->i_pos = i_pos;
83 list_add(&MSDOS_I(inode)->i_fat_hash,
84 fat_inode_hashtable + fat_hash(inode->i_sb, i_pos));
85 spin_unlock(&fat_inode_lock);
86 }
87
88 void fat_detach(struct inode *inode)
89 {
90 spin_lock(&fat_inode_lock);
91 MSDOS_I(inode)->i_pos = 0;
92 list_del_init(&MSDOS_I(inode)->i_fat_hash);
93 spin_unlock(&fat_inode_lock);
94 }
95
96 struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
97 {
98 struct list_head *p = fat_inode_hashtable + fat_hash(sb, i_pos);
99 struct list_head *walk;
100 struct msdos_inode_info *i;
101 struct inode *inode = NULL;
102
103 spin_lock(&fat_inode_lock);
104 list_for_each(walk, p) {
105 i = list_entry(walk, struct msdos_inode_info, i_fat_hash);
106 if (i->vfs_inode.i_sb != sb)
107 continue;
108 if (i->i_pos != i_pos)
109 continue;
110 inode = igrab(&i->vfs_inode);
111 if (inode)
112 break;
113 }
114 spin_unlock(&fat_inode_lock);
115 return inode;
116 }
117
118 static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de);
119
120 struct inode *fat_build_inode(struct super_block *sb,
121 struct msdos_dir_entry *de, loff_t i_pos, int *res)
122 {
123 struct inode *inode;
124 *res = 0;
125 inode = fat_iget(sb, i_pos);
126 if (inode)
127 goto out;
128 inode = new_inode(sb);
129 *res = -ENOMEM;
130 if (!inode)
131 goto out;
132 inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
133 inode->i_version = 1;
134 *res = fat_fill_inode(inode, de);
135 if (*res < 0) {
136 iput(inode);
137 inode = NULL;
138 goto out;
139 }
140 fat_attach(inode, i_pos);
141 insert_inode_hash(inode);
142 out:
143 return inode;
144 }
145
146 void fat_delete_inode(struct inode *inode)
147 {
148 if (!is_bad_inode(inode)) {
149 inode->i_size = 0;
150 fat_truncate(inode);
151 }
152 clear_inode(inode);
153 }
154
155 void fat_clear_inode(struct inode *inode)
156 {
157 if (is_bad_inode(inode))
158 return;
159 lock_kernel();
160 spin_lock(&fat_inode_lock);
161 fat_cache_inval_inode(inode);
162 list_del_init(&MSDOS_I(inode)->i_fat_hash);
163 spin_unlock(&fat_inode_lock);
164 unlock_kernel();
165 }
166
167 void fat_put_super(struct super_block *sb)
168 {
169 struct msdos_sb_info *sbi = MSDOS_SB(sb);
170
171 if (!(sb->s_flags & MS_RDONLY))
172 fat_clusters_flush(sb);
173
174 if (sbi->nls_disk) {
175 unload_nls(sbi->nls_disk);
176 sbi->nls_disk = NULL;
177 sbi->options.codepage = fat_default_codepage;
178 }
179 if (sbi->nls_io) {
180 unload_nls(sbi->nls_io);
181 sbi->nls_io = NULL;
182 }
183 if (sbi->options.iocharset != fat_default_iocharset) {
184 kfree(sbi->options.iocharset);
185 sbi->options.iocharset = fat_default_iocharset;
186 }
187
188 sb->s_fs_info = NULL;
189 kfree(sbi);
190 }
191
192 static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
193 {
194 struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb);
195 struct fat_mount_options *opts = &sbi->options;
196 int isvfat = opts->isvfat;
197
198 if (opts->fs_uid != 0)
199 seq_printf(m, ",uid=%u", opts->fs_uid);
200 if (opts->fs_gid != 0)
201 seq_printf(m, ",gid=%u", opts->fs_gid);
202 seq_printf(m, ",fmask=%04o", opts->fs_fmask);
203 seq_printf(m, ",dmask=%04o", opts->fs_dmask);
204 if (sbi->nls_disk && opts->codepage != fat_default_codepage)
205 seq_printf(m, ",codepage=%s", sbi->nls_disk->charset);
206 if (isvfat) {
207 if (sbi->nls_io &&
208 strcmp(opts->iocharset, fat_default_iocharset))
209 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
210
211 switch (opts->shortname) {
212 case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95:
213 seq_puts(m, ",shortname=win95");
214 break;
215 case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT:
216 seq_puts(m, ",shortname=winnt");
217 break;
218 case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95:
219 seq_puts(m, ",shortname=mixed");
220 break;
221 case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95:
222 /* seq_puts(m, ",shortname=lower"); */
223 break;
224 default:
225 seq_puts(m, ",shortname=unknown");
226 break;
227 }
228 }
229 if (opts->name_check != 'n')
230 seq_printf(m, ",check=%c", opts->name_check);
231 if (opts->quiet)
232 seq_puts(m, ",quiet");
233 if (opts->showexec)
234 seq_puts(m, ",showexec");
235 if (opts->sys_immutable)
236 seq_puts(m, ",sys_immutable");
237 if (!isvfat) {
238 if (opts->dotsOK)
239 seq_puts(m, ",dotsOK=yes");
240 if (opts->nocase)
241 seq_puts(m, ",nocase");
242 } else {
243 if (opts->utf8)
244 seq_puts(m, ",utf8");
245 if (opts->unicode_xlate)
246 seq_puts(m, ",uni_xlate");
247 if (!opts->numtail)
248 seq_puts(m, ",nonumtail");
249 }
250
251 return 0;
252 }
253
254 enum {
255 Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
256 Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_nocase,
257 Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable,
258 Opt_dots, Opt_nodots,
259 Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
260 Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
261 Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
262 Opt_obsolate, Opt_err,
263 };
264
265 static match_table_t fat_tokens = {
266 {Opt_check_r, "check=relaxed"},
267 {Opt_check_s, "check=strict"},
268 {Opt_check_n, "check=normal"},
269 {Opt_check_r, "check=r"},
270 {Opt_check_s, "check=s"},
271 {Opt_check_n, "check=n"},
272 {Opt_uid, "uid=%u"},
273 {Opt_gid, "gid=%u"},
274 {Opt_umask, "umask=%o"},
275 {Opt_dmask, "dmask=%o"},
276 {Opt_fmask, "fmask=%o"},
277 {Opt_codepage, "codepage=%u"},
278 {Opt_nocase, "nocase"},
279 {Opt_quiet, "quiet"},
280 {Opt_showexec, "showexec"},
281 {Opt_debug, "debug"},
282 {Opt_immutable, "sys_immutable"},
283 {Opt_obsolate, "conv=binary"},
284 {Opt_obsolate, "conv=text"},
285 {Opt_obsolate, "conv=auto"},
286 {Opt_obsolate, "conv=b"},
287 {Opt_obsolate, "conv=t"},
288 {Opt_obsolate, "conv=a"},
289 {Opt_obsolate, "fat=%u"},
290 {Opt_obsolate, "blocksize=%u"},
291 {Opt_obsolate, "cvf_format=%20s"},
292 {Opt_obsolate, "cvf_options=%100s"},
293 {Opt_obsolate, "posix"},
294 {Opt_err, NULL}
295 };
296 static match_table_t msdos_tokens = {
297 {Opt_nodots, "nodots"},
298 {Opt_nodots, "dotsOK=no"},
299 {Opt_dots, "dots"},
300 {Opt_dots, "dotsOK=yes"},
301 {Opt_err, NULL}
302 };
303 static match_table_t vfat_tokens = {
304 {Opt_charset, "iocharset=%s"},
305 {Opt_shortname_lower, "shortname=lower"},
306 {Opt_shortname_win95, "shortname=win95"},
307 {Opt_shortname_winnt, "shortname=winnt"},
308 {Opt_shortname_mixed, "shortname=mixed"},
309 {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
310 {Opt_utf8_no, "utf8=no"},
311 {Opt_utf8_no, "utf8=false"},
312 {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
313 {Opt_utf8_yes, "utf8=yes"},
314 {Opt_utf8_yes, "utf8=true"},
315 {Opt_utf8_yes, "utf8"},
316 {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
317 {Opt_uni_xl_no, "uni_xlate=no"},
318 {Opt_uni_xl_no, "uni_xlate=false"},
319 {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
320 {Opt_uni_xl_yes, "uni_xlate=yes"},
321 {Opt_uni_xl_yes, "uni_xlate=true"},
322 {Opt_uni_xl_yes, "uni_xlate"},
323 {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
324 {Opt_nonumtail_no, "nonumtail=no"},
325 {Opt_nonumtail_no, "nonumtail=false"},
326 {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
327 {Opt_nonumtail_yes, "nonumtail=yes"},
328 {Opt_nonumtail_yes, "nonumtail=true"},
329 {Opt_nonumtail_yes, "nonumtail"},
330 {Opt_err, NULL}
331 };
332
333 static int parse_options(char *options, int is_vfat, int *debug,
334 struct fat_mount_options *opts)
335 {
336 char *p;
337 substring_t args[MAX_OPT_ARGS];
338 int option;
339 char *iocharset;
340
341 opts->isvfat = is_vfat;
342
343 opts->fs_uid = current->uid;
344 opts->fs_gid = current->gid;
345 opts->fs_fmask = opts->fs_dmask = current->fs->umask;
346 opts->codepage = fat_default_codepage;
347 opts->iocharset = fat_default_iocharset;
348 if (is_vfat)
349 opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95;
350 else
351 opts->shortname = 0;
352 opts->name_check = 'n';
353 opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
354 opts->utf8 = opts->unicode_xlate = 0;
355 opts->numtail = 1;
356 opts->nocase = 0;
357 *debug = 0;
358
359 if (!options)
360 return 0;
361
362 while ((p = strsep(&options, ",")) != NULL) {
363 int token;
364 if (!*p)
365 continue;
366
367 token = match_token(p, fat_tokens, args);
368 if (token == Opt_err) {
369 if (is_vfat)
370 token = match_token(p, vfat_tokens, args);
371 else
372 token = match_token(p, msdos_tokens, args);
373 }
374 switch (token) {
375 case Opt_check_s:
376 opts->name_check = 's';
377 break;
378 case Opt_check_r:
379 opts->name_check = 'r';
380 break;
381 case Opt_check_n:
382 opts->name_check = 'n';
383 break;
384 case Opt_nocase:
385 if (!is_vfat)
386 opts->nocase = 1;
387 else {
388 /* for backward compatibility */
389 opts->shortname = VFAT_SFN_DISPLAY_WIN95
390 | VFAT_SFN_CREATE_WIN95;
391 }
392 break;
393 case Opt_quiet:
394 opts->quiet = 1;
395 break;
396 case Opt_showexec:
397 opts->showexec = 1;
398 break;
399 case Opt_debug:
400 *debug = 1;
401 break;
402 case Opt_immutable:
403 opts->sys_immutable = 1;
404 break;
405 case Opt_uid:
406 if (match_int(&args[0], &option))
407 return 0;
408 opts->fs_uid = option;
409 break;
410 case Opt_gid:
411 if (match_int(&args[0], &option))
412 return 0;
413 opts->fs_gid = option;
414 break;
415 case Opt_umask:
416 if (match_octal(&args[0], &option))
417 return 0;
418 opts->fs_fmask = opts->fs_dmask = option;
419 break;
420 case Opt_dmask:
421 if (match_octal(&args[0], &option))
422 return 0;
423 opts->fs_dmask = option;
424 break;
425 case Opt_fmask:
426 if (match_octal(&args[0], &option))
427 return 0;
428 opts->fs_fmask = option;
429 break;
430 case Opt_codepage:
431 if (match_int(&args[0], &option))
432 return 0;
433 opts->codepage = option;
434 break;
435
436 /* msdos specific */
437 case Opt_dots:
438 opts->dotsOK = 1;
439 break;
440 case Opt_nodots:
441 opts->dotsOK = 0;
442 break;
443
444 /* vfat specific */
445 case Opt_charset:
446 if (opts->iocharset != fat_default_iocharset)
447 kfree(opts->iocharset);
448 iocharset = match_strdup(&args[0]);
449 if (!iocharset)
450 return -ENOMEM;
451 opts->iocharset = iocharset;
452 break;
453 case Opt_shortname_lower:
454 opts->shortname = VFAT_SFN_DISPLAY_LOWER
455 | VFAT_SFN_CREATE_WIN95;
456 break;
457 case Opt_shortname_win95:
458 opts->shortname = VFAT_SFN_DISPLAY_WIN95
459 | VFAT_SFN_CREATE_WIN95;
460 break;
461 case Opt_shortname_winnt:
462 opts->shortname = VFAT_SFN_DISPLAY_WINNT
463 | VFAT_SFN_CREATE_WINNT;
464 break;
465 case Opt_shortname_mixed:
466 opts->shortname = VFAT_SFN_DISPLAY_WINNT
467 | VFAT_SFN_CREATE_WIN95;
468 break;
469 case Opt_utf8_no: /* 0 or no or false */
470 opts->utf8 = 0;
471 break;
472 case Opt_utf8_yes: /* empty or 1 or yes or true */
473 opts->utf8 = 1;
474 break;
475 case Opt_uni_xl_no: /* 0 or no or false */
476 opts->unicode_xlate = 0;
477 break;
478 case Opt_uni_xl_yes: /* empty or 1 or yes or true */
479 opts->unicode_xlate = 1;
480 break;
481 case Opt_nonumtail_no: /* 0 or no or false */
482 opts->numtail = 1; /* negated option */
483 break;
484 case Opt_nonumtail_yes: /* empty or 1 or yes or true */
485 opts->numtail = 0; /* negated option */
486 break;
487
488 /* obsolete mount options */
489 case Opt_obsolate:
490 printk(KERN_INFO "FAT: \"%s\" option is obsolete, "
491 "not supported now\n", p);
492 break;
493 /* unknown option */
494 default:
495 printk(KERN_ERR "FAT: Unrecognized mount option \"%s\" "
496 "or missing value\n", p);
497 return -EINVAL;
498 }
499 }
500 /* UTF8 doesn't provide FAT semantics */
501 if (!strcmp(opts->iocharset, "utf8")) {
502 printk(KERN_ERR "FAT: utf8 is not a recommended IO charset"
503 " for FAT filesystems, filesystem will be case sensitive!\n");
504 }
505
506 if (opts->unicode_xlate)
507 opts->utf8 = 0;
508
509 return 0;
510 }
511
512 static int fat_calc_dir_size(struct inode *inode)
513 {
514 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
515 int ret, fclus, dclus;
516
517 inode->i_size = 0;
518 if (MSDOS_I(inode)->i_start == 0)
519 return 0;
520
521 ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
522 if (ret < 0)
523 return ret;
524 inode->i_size = (fclus + 1) << sbi->cluster_bits;
525
526 return 0;
527 }
528
529 static int fat_read_root(struct inode *inode)
530 {
531 struct super_block *sb = inode->i_sb;
532 struct msdos_sb_info *sbi = MSDOS_SB(sb);
533 int error;
534
535 MSDOS_I(inode)->file_cluster = MSDOS_I(inode)->disk_cluster = 0;
536 MSDOS_I(inode)->i_pos = 0;
537 inode->i_uid = sbi->options.fs_uid;
538 inode->i_gid = sbi->options.fs_gid;
539 inode->i_version++;
540 inode->i_generation = 0;
541 inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
542 inode->i_op = sbi->dir_ops;
543 inode->i_fop = &fat_dir_operations;
544 if (sbi->fat_bits == 32) {
545 MSDOS_I(inode)->i_start = sbi->root_cluster;
546 error = fat_calc_dir_size(inode);
547 if (error < 0)
548 return error;
549 } else {
550 MSDOS_I(inode)->i_start = 0;
551 inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
552 }
553 inode->i_blksize = sbi->cluster_size;
554 inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
555 & ~((loff_t)sbi->cluster_size - 1)) >> 9;
556 MSDOS_I(inode)->i_logstart = 0;
557 MSDOS_I(inode)->mmu_private = inode->i_size;
558
559 MSDOS_I(inode)->i_attrs = 0;
560 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
561 inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
562 MSDOS_I(inode)->i_ctime_ms = 0;
563 inode->i_nlink = fat_subdirs(inode)+2;
564
565 return 0;
566 }
567
568 /*
569 * a FAT file handle with fhtype 3 is
570 * 0/ i_ino - for fast, reliable lookup if still in the cache
571 * 1/ i_generation - to see if i_ino is still valid
572 * bit 0 == 0 iff directory
573 * 2/ i_pos(8-39) - if ino has changed, but still in cache
574 * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
575 * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
576 *
577 * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
578 * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
579 * of i_logstart is used to store the directory entry offset.
580 */
581
582 static struct dentry *
583 fat_decode_fh(struct super_block *sb, __u32 *fh, int len, int fhtype,
584 int (*acceptable)(void *context, struct dentry *de),
585 void *context)
586 {
587 if (fhtype != 3)
588 return ERR_PTR(-ESTALE);
589 if (len < 5)
590 return ERR_PTR(-ESTALE);
591
592 return sb->s_export_op->find_exported_dentry(sb, fh, NULL, acceptable, context);
593 }
594
595 static struct dentry *fat_get_dentry(struct super_block *sb, void *inump)
596 {
597 struct inode *inode = NULL;
598 struct dentry *result;
599 __u32 *fh = inump;
600
601 inode = iget(sb, fh[0]);
602 if (!inode || is_bad_inode(inode) || inode->i_generation != fh[1]) {
603 if (inode)
604 iput(inode);
605 inode = NULL;
606 }
607 if (!inode) {
608 loff_t i_pos;
609 int i_logstart = fh[3] & 0x0fffffff;
610
611 i_pos = (loff_t)fh[2] << 8;
612 i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28);
613
614 /* try 2 - see if i_pos is in F-d-c
615 * require i_logstart to be the same
616 * Will fail if you truncate and then re-write
617 */
618
619 inode = fat_iget(sb, i_pos);
620 if (inode && MSDOS_I(inode)->i_logstart != i_logstart) {
621 iput(inode);
622 inode = NULL;
623 }
624 }
625 if (!inode) {
626 /* For now, do nothing
627 * What we could do is:
628 * follow the file starting at fh[4], and record
629 * the ".." entry, and the name of the fh[2] entry.
630 * The follow the ".." file finding the next step up.
631 * This way we build a path to the root of
632 * the tree. If this works, we lookup the path and so
633 * get this inode into the cache.
634 * Finally try the fat_iget lookup again
635 * If that fails, then weare totally out of luck
636 * But all that is for another day
637 */
638 }
639 if (!inode)
640 return ERR_PTR(-ESTALE);
641
642
643 /* now to find a dentry.
644 * If possible, get a well-connected one
645 */
646 result = d_alloc_anon(inode);
647 if (result == NULL) {
648 iput(inode);
649 return ERR_PTR(-ENOMEM);
650 }
651 result->d_op = sb->s_root->d_op;
652 return result;
653 }
654
655 static int
656 fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
657 {
658 int len = *lenp;
659 struct inode *inode = de->d_inode;
660 u32 ipos_h, ipos_m, ipos_l;
661
662 if (len < 5)
663 return 255; /* no room */
664
665 ipos_h = MSDOS_I(inode)->i_pos >> 8;
666 ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24;
667 ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28;
668 *lenp = 5;
669 fh[0] = inode->i_ino;
670 fh[1] = inode->i_generation;
671 fh[2] = ipos_h;
672 fh[3] = ipos_m | MSDOS_I(inode)->i_logstart;
673 spin_lock(&de->d_lock);
674 fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart;
675 spin_unlock(&de->d_lock);
676 return 3;
677 }
678
679 static struct dentry *fat_get_parent(struct dentry *child)
680 {
681 struct buffer_head *bh=NULL;
682 struct msdos_dir_entry *de = NULL;
683 struct dentry *parent = NULL;
684 int res;
685 loff_t i_pos = 0;
686 struct inode *inode;
687
688 lock_kernel();
689 res = fat_scan(child->d_inode, MSDOS_DOTDOT, &bh, &de, &i_pos);
690
691 if (res < 0)
692 goto out;
693 inode = fat_build_inode(child->d_sb, de, i_pos, &res);
694 if (res)
695 goto out;
696 if (!inode)
697 res = -EACCES;
698 else {
699 parent = d_alloc_anon(inode);
700 if (!parent) {
701 iput(inode);
702 res = -ENOMEM;
703 }
704 }
705
706 out:
707 if(bh)
708 brelse(bh);
709 unlock_kernel();
710 if (res)
711 return ERR_PTR(res);
712 else
713 return parent;
714 }
715
716 static kmem_cache_t *fat_inode_cachep;
717
718 /*====prince mark
719 #define SLAB_NOFS GFP_NOFS
720 #define SLAB_NOIO GFP_NOIO
721 #define SLAB_ATOMIC GFP_ATOMIC
722 #define SLAB_USER GFP_USER
723 #define SLAB_KERNEL GFP_KERNEL
724 #define SLAB_DMA GFP_DMA
725 ================*/
726
727 static struct inode *fat_alloc_inode(struct super_block *sb)
728 {
729 struct msdos_inode_info *ei;
730 /*===prince mark
731 ei = (struct msdos_inode_info *)kmem_cache_alloc(fat_inode_cachep, SLAB_KERNEL);
732 ===============*/
733 //prince change add
734 ei = (struct msdos_inode_info *)kmem_cache_alloc(fat_inode_cachep, SLAB_ATOMIC);
735 //prince change add
736 if (!ei)
737 return NULL;
738 return &ei->vfs_inode;
739 }
740
741 static void fat_destroy_inode(struct inode *inode)
742 {
743 kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
744 }
745
746 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
747 {
748 struct msdos_inode_info *ei = (struct msdos_inode_info *) foo;
749
750 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
751 SLAB_CTOR_CONSTRUCTOR) {
752 INIT_LIST_HEAD(&ei->i_fat_hash);
753 inode_init_once(&ei->vfs_inode);
754 }
755 }
756
757 int __init fat_init_inodecache(void)
758 {
759 fat_inode_cachep = kmem_cache_create("fat_inode_cache",
760 sizeof(struct msdos_inode_info),
761 0, SLAB_RECLAIM_ACCOUNT,
762 init_once, NULL);
763 if (fat_inode_cachep == NULL)
764 return -ENOMEM;
765 return 0;
766 }
767
768 void __exit fat_destroy_inodecache(void)
769 {
770 if (kmem_cache_destroy(fat_inode_cachep))
771 printk(KERN_INFO "fat_inode_cache: not all structures were freed\n");
772 }
773
774 static int fat_remount(struct super_block *sb, int *flags, char *data)
775 {
776 *flags |= MS_NODIRATIME;
777 return 0;
778 }
779
780 static struct super_operations fat_sops = {
781 .alloc_inode = fat_alloc_inode,
782 .destroy_inode = fat_destroy_inode,
783 .write_inode = fat_write_inode,
784 .delete_inode = fat_delete_inode,
785 .put_super = fat_put_super,
786 .statfs = fat_statfs,
787 .clear_inode = fat_clear_inode,
788 .remount_fs = fat_remount,
789
790 .read_inode = make_bad_inode,
791
792 .show_options = fat_show_options,
793 };
794
795 static struct export_operations fat_export_ops = {
796 .decode_fh = fat_decode_fh,
797 .encode_fh = fat_encode_fh,
798 .get_dentry = fat_get_dentry,
799 .get_parent = fat_get_parent,
800 };
801
802 /*
803 * Read the super block of an MS-DOS FS.
804 */
805 int fat_fill_super(struct super_block *sb, void *data, int silent,
806 struct inode_operations *fs_dir_inode_ops, int isvfat)
807 {
808 struct inode *root_inode = NULL;
809 struct buffer_head *bh;
810 struct fat_boot_sector *b;
811 struct msdos_sb_info *sbi;
812 u16 logical_sector_size;
813 u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors;
814 int debug, first;
815 unsigned int media;
816 long error;
817 char buf[50];
818
819 sbi = kmalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
820 if (!sbi)
821 return -ENOMEM;
822 sb->s_fs_info = sbi;
823 memset(sbi, 0, sizeof(struct msdos_sb_info));
824
825 sb->s_flags |= MS_NODIRATIME;
826 sb->s_magic = MSDOS_SUPER_MAGIC;
827 sb->s_op = &fat_sops;
828 sb->s_export_op = &fat_export_ops;
829 sbi->dir_ops = fs_dir_inode_ops;
830
831 error = parse_options(data, isvfat, &debug, &sbi->options);
832 if (error)
833 goto out_fail;
834
835 fat_cache_init(sb);
836 /* set up enough so that it can read an inode */
837 init_MUTEX(&sbi->fat_lock);
838
839 error = -EIO;
840 sb_min_blocksize(sb, 512);
841 bh = sb_bread(sb, 0);
842 if (bh == NULL) {
843 printk(KERN_ERR "FAT: unable to read boot sector\n");
844 goto out_fail;
845 }
846
847 b = (struct fat_boot_sector *) bh->b_data;
848 if (!b->reserved) {
849 if (!silent)
850 printk(KERN_ERR "FAT: bogus number of reserved sectors\n");
851 brelse(bh);
852 goto out_invalid;
853 }
854 if (!b->fats) {
855 if (!silent)
856 printk(KERN_ERR "FAT: bogus number of FAT structure\n");
857 brelse(bh);
858 goto out_invalid;
859 }
860
861 /*
862 * Earlier we checked here that b->secs_track and b->head are nonzero,
863 * but it turns out valid FAT filesystems can have zero there.
864 */
865
866 media = b->media;
867 if (!FAT_VALID_MEDIA(media)) {
868 if (!silent)
869 printk(KERN_ERR "FAT: invalid media value (0x%02x)\n",
870 media);
871 brelse(bh);
872 goto out_invalid;
873 }
874 logical_sector_size = CF_LE_W(get_unaligned((__le16 *)&b->sector_size));
875 if (!logical_sector_size
876 || (logical_sector_size & (logical_sector_size - 1))
877 || (logical_sector_size < 512)
878 || (PAGE_CACHE_SIZE < logical_sector_size)) {
879 if (!silent)
880 printk(KERN_ERR "FAT: bogus logical sector size %u\n",
881 logical_sector_size);
882 brelse(bh);
883 goto out_invalid;
884 }
885 sbi->sec_per_clus = b->sec_per_clus;
886 if (!sbi->sec_per_clus
887 || (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) {
888 if (!silent)
889 printk(KERN_ERR "FAT: bogus sectors per cluster %u\n",
890 sbi->sec_per_clus);
891 brelse(bh);
892 goto out_invalid;
893 }
894
895 if (logical_sector_size < sb->s_blocksize) {
896 printk(KERN_ERR "FAT: logical sector size too small for device"
897 " (logical sector size = %u)\n", logical_sector_size);
898 brelse(bh);
899 goto out_fail;
900 }
901 if (logical_sector_size > sb->s_blocksize) {
902 brelse(bh);
903
904 if (!sb_set_blocksize(sb, logical_sector_size)) {
905 printk(KERN_ERR "FAT: unable to set blocksize %u\n",
906 logical_sector_size);
907 goto out_fail;
908 }
909 bh = sb_bread(sb, 0);
910 if (bh == NULL) {
911 printk(KERN_ERR "FAT: unable to read boot sector"
912 " (logical sector size = %lu)\n",
913 sb->s_blocksize);
914 goto out_fail;
915 }
916 b = (struct fat_boot_sector *) bh->b_data;
917 }
918
919 sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
920 sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
921 sbi->fats = b->fats;
922 sbi->fat_bits = 0; /* Don't know yet */
923 sbi->fat_start = CF_LE_W(b->reserved);
924 sbi->fat_length = CF_LE_W(b->fat_length);
925 sbi->root_cluster = 0;
926 sbi->free_clusters = -1; /* Don't know yet */
927 sbi->prev_free = -1;
928
929 if (!sbi->fat_length && b->fat32_length) {
930 struct fat_boot_fsinfo *fsinfo;
931 struct buffer_head *fsinfo_bh;
932
933 /* Must be FAT32 */
934 sbi->fat_bits = 32;
935 sbi->fat_length = CF_LE_L(b->fat32_length);
936 sbi->root_cluster = CF_LE_L(b->root_cluster);
937
938 sb->s_maxbytes = 0xffffffff;
939
940 /* MC - if info_sector is 0, don't multiply by 0 */
941 sbi->fsinfo_sector = CF_LE_W(b->info_sector);
942 if (sbi->fsinfo_sector == 0)
943 sbi->fsinfo_sector = 1;
944
945 fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector);
946 if (fsinfo_bh == NULL) {
947 printk(KERN_ERR "FAT: bread failed, FSINFO block"
948 " (sector = %lu)\n", sbi->fsinfo_sector);
949 brelse(bh);
950 goto out_fail;
951 }
952
953 fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data;
954 if (!IS_FSINFO(fsinfo)) {
955 printk(KERN_WARNING
956 "FAT: Did not find valid FSINFO signature.\n"
957 " Found signature1 0x%08x signature2 0x%08x"
958 " (sector = %lu)\n",
959 CF_LE_L(fsinfo->signature1),
960 CF_LE_L(fsinfo->signature2),
961 sbi->fsinfo_sector);
962 } else {
963 sbi->free_clusters = CF_LE_L(fsinfo->free_clusters);
964 sbi->prev_free = CF_LE_L(fsinfo->next_cluster);
965 }
966
967 brelse(fsinfo_bh);
968 }
969
970 sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
971 sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
972
973 sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length;
974 sbi->dir_entries = CF_LE_W(get_unaligned((__le16 *)&b->dir_entries));
975 if (sbi->dir_entries & (sbi->dir_per_block - 1)) {
976 if (!silent)
977 printk(KERN_ERR "FAT: bogus directroy-entries per block"
978 " (%u)\n", sbi->dir_entries);
979 brelse(bh);
980 goto out_invalid;
981 }
982
983 rootdir_sectors = sbi->dir_entries
984 * sizeof(struct msdos_dir_entry) / sb->s_blocksize;
985 sbi->data_start = sbi->dir_start + rootdir_sectors;
986 total_sectors = CF_LE_W(get_unaligned((__le16 *)&b->sectors));
987 if (total_sectors == 0)
988 total_sectors = CF_LE_L(b->total_sect);
989
990 total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus;
991
992 if (sbi->fat_bits != 32)
993 sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12;
994
995 /* check that FAT table does not overflow */
996 fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
997 total_clusters = min(total_clusters, fat_clusters - 2);
998 if (total_clusters > MAX_FAT(sb)) {
999 if (!silent)
1000 printk(KERN_ERR "FAT: count of clusters too big (%u)\n",
1001 total_clusters);
1002 brelse(bh);
1003 goto out_invalid;
1004 }
1005
1006 sbi->clusters = total_clusters;
1007
1008 brelse(bh);
1009
1010 /* validity check of FAT */
1011 first = __fat_access(sb, 0, -1);
1012 if (first < 0) {
1013 error = first;
1014 goto out_fail;
1015 }
1016 if (FAT_FIRST_ENT(sb, media) == first) {
1017 /* all is as it should be */
1018 } else if (media == 0xf8 && FAT_FIRST_ENT(sb, 0xfe) == first) {
1019 /* bad, reported on pc9800 */
1020 } else if (media == 0xf0 && FAT_FIRST_ENT(sb, 0xf8) == first) {
1021 /* bad, reported with a MO disk on win95/me */
1022 } else if (first == 0) {
1023 /* bad, reported with a SmartMedia card */
1024 } else {
1025 if (!silent)
1026 printk(KERN_ERR "FAT: invalid first entry of FAT "
1027 "(0x%x != 0x%x)\n",
1028 FAT_FIRST_ENT(sb, media), first);
1029 goto out_invalid;
1030 }
1031
1032 error = -EINVAL;
1033 sprintf(buf, "cp%d", sbi->options.codepage);
1034 sbi->nls_disk = load_nls(buf);
1035 if (!sbi->nls_disk) {
1036 printk(KERN_ERR "FAT: codepage %s not found\n", buf);
1037 goto out_fail;
1038 }
1039
1040 /* FIXME: utf8 is using iocharset for upper/lower conversion */
1041 if (sbi->options.isvfat) {
1042 sbi->nls_io = load_nls(sbi->options.iocharset);
1043 if (!sbi->nls_io) {
1044 printk(KERN_ERR "FAT: IO charset %s not found\n",
1045 sbi->options.iocharset);
1046 goto out_fail;
1047 }
1048 }
1049
1050 error = -ENOMEM;
1051 root_inode = new_inode(sb);
1052 if (!root_inode)
1053 goto out_fail;
1054 root_inode->i_ino = MSDOS_ROOT_INO;
1055 root_inode->i_version = 1;
1056 error = fat_read_root(root_inode);
1057 if (error < 0)
1058 goto out_fail;
1059 error = -ENOMEM;
1060 insert_inode_hash(root_inode);
1061 sb->s_root = d_alloc_root(root_inode);
1062 if (!sb->s_root) {
1063 printk(KERN_ERR "FAT: get root inode failed\n");
1064 goto out_fail;
1065 }
1066
1067 return 0;
1068
1069 out_invalid:
1070 error = -EINVAL;
1071 if (!silent)
1072 printk(KERN_INFO "VFS: Can't find a valid FAT filesystem"
1073 " on dev %s.\n", sb->s_id);
1074
1075 out_fail:
1076 if (root_inode)
1077 iput(root_inode);
1078 if (sbi->nls_io)
1079 unload_nls(sbi->nls_io);
1080 if (sbi->nls_disk)
1081 unload_nls(sbi->nls_disk);
1082 if (sbi->options.iocharset != fat_default_iocharset)
1083 kfree(sbi->options.iocharset);
1084 sb->s_fs_info = NULL;
1085 kfree(sbi);
1086 return error;
1087 }
1088
1089 int fat_statfs(struct super_block *sb, struct kstatfs *buf)
1090 {
1091 int free, nr, ret;
1092
1093 if (MSDOS_SB(sb)->free_clusters != -1)
1094 free = MSDOS_SB(sb)->free_clusters;
1095 else {
1096 lock_fat(sb);
1097 if (MSDOS_SB(sb)->free_clusters != -1)
1098 free = MSDOS_SB(sb)->free_clusters;
1099 else {
1100 free = 0;
1101 for (nr = 2; nr < MSDOS_SB(sb)->clusters + 2; nr++) {
1102 ret = fat_access(sb, nr, -1);
1103 if (ret < 0) {
1104 unlock_fat(sb);
1105 return ret;
1106 } else if (ret == FAT_ENT_FREE)
1107 free++;
1108 }
1109 MSDOS_SB(sb)->free_clusters = free;
1110 }
1111 unlock_fat(sb);
1112 }
1113
1114 buf->f_type = sb->s_magic;
1115 buf->f_bsize = MSDOS_SB(sb)->cluster_size;
1116 buf->f_blocks = MSDOS_SB(sb)->clusters;
1117 buf->f_bfree = free;
1118 buf->f_bavail = free;
1119 buf->f_namelen = MSDOS_SB(sb)->options.isvfat ? 260 : 12;
1120
1121 return 0;
1122 }
1123
1124 static int is_exec(unsigned char *extension)
1125 {
1126 unsigned char *exe_extensions = "EXECOMBAT", *walk;
1127
1128 for (walk = exe_extensions; *walk; walk += 3)
1129 if (!strncmp(extension, walk, 3))
1130 return 1;
1131 return 0;
1132 }
1133
1134 static int fat_writepage(struct page *page, struct writeback_control *wbc)
1135 {
1136 return block_write_full_page(page,fat_get_block, wbc);
1137 }
1138 static int fat_readpage(struct file *file, struct page *page)
1139 {
1140 return block_read_full_page(page,fat_get_block);
1141 }
1142
1143 static int
1144 fat_prepare_write(struct file *file, struct page *page,
1145 unsigned from, unsigned to)
1146 {
1147 kmap(page);
1148 return cont_prepare_write(page,from,to,fat_get_block,
1149 &MSDOS_I(page->mapping->host)->mmu_private);
1150 }
1151
1152 static int
1153 fat_commit_write(struct file *file, struct page *page,
1154 unsigned from, unsigned to)
1155 {
1156 kunmap(page);
1157 return generic_commit_write(file, page, from, to);
1158 }
1159
1160 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
1161 {
1162 return generic_block_bmap(mapping,block,fat_get_block);
1163 }
1164 static struct address_space_operations fat_aops = {
1165 .readpage = fat_readpage,
1166 .writepage = fat_writepage,
1167 .sync_page = block_sync_page,
1168 .prepare_write = fat_prepare_write,
1169 .commit_write = fat_commit_write,
1170 .bmap = _fat_bmap
1171 };
1172
1173 /* doesn't deal with root inode */
1174 static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
1175 {
1176 struct super_block *sb = inode->i_sb;
1177 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1178 int error;
1179
1180 MSDOS_I(inode)->file_cluster = MSDOS_I(inode)->disk_cluster = 0;
1181 MSDOS_I(inode)->i_pos = 0;
1182 inode->i_uid = sbi->options.fs_uid;
1183 inode->i_gid = sbi->options.fs_gid;
1184 inode->i_version++;
1185 inode->i_generation = get_seconds();
1186
1187 if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
1188 inode->i_generation &= ~1;
1189 inode->i_mode = MSDOS_MKMODE(de->attr,
1190 S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
1191 inode->i_op = sbi->dir_ops;
1192 inode->i_fop = &fat_dir_operations;
1193
1194 MSDOS_I(inode)->i_start = CF_LE_W(de->start);
1195 if (sbi->fat_bits == 32)
1196 MSDOS_I(inode)->i_start |= (CF_LE_W(de->starthi) << 16);
1197
1198 MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
1199 error = fat_calc_dir_size(inode);
1200 if (error < 0)
1201 return error;
1202 MSDOS_I(inode)->mmu_private = inode->i_size;
1203
1204 inode->i_nlink = fat_subdirs(inode);
1205 } else { /* not a directory */
1206 inode->i_generation |= 1;
1207 inode->i_mode = MSDOS_MKMODE(de->attr,
1208 ((sbi->options.showexec &&
1209 !is_exec(de->ext))
1210 ? S_IRUGO|S_IWUGO : S_IRWXUGO)
1211 & ~sbi->options.fs_fmask) | S_IFREG;
1212 MSDOS_I(inode)->i_start = CF_LE_W(de->start);
1213 if (sbi->fat_bits == 32)
1214 MSDOS_I(inode)->i_start |= (CF_LE_W(de->starthi) << 16);
1215
1216 MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
1217 inode->i_size = CF_LE_L(de->size);
1218 inode->i_op = &fat_file_inode_operations;
1219 inode->i_fop = &fat_file_operations;
1220 inode->i_mapping->a_ops = &fat_aops;
1221 MSDOS_I(inode)->mmu_private = inode->i_size;
1222 }
1223 if(de->attr & ATTR_SYS)
1224 if (sbi->options.sys_immutable)
1225 inode->i_flags |= S_IMMUTABLE;
1226 MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
1227 /* this is as close to the truth as we can get ... */
1228 inode->i_blksize = sbi->cluster_size;
1229 inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
1230 & ~((loff_t)sbi->cluster_size - 1)) >> 9;
1231 inode->i_mtime.tv_sec = inode->i_atime.tv_sec =
1232 date_dos2unix(CF_LE_W(de->time),CF_LE_W(de->date));
1233 inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = 0;
1234 inode->i_ctime.tv_sec =
1235 MSDOS_SB(sb)->options.isvfat
1236 ? date_dos2unix(CF_LE_W(de->ctime),CF_LE_W(de->cdate))
1237 : inode->i_mtime.tv_sec;
1238 inode->i_ctime.tv_nsec = de->ctime_ms * 1000000;
1239 MSDOS_I(inode)->i_ctime_ms = de->ctime_ms;
1240
1241 return 0;
1242 }
1243
1244 int fat_write_inode(struct inode *inode, int wait)
1245 {
1246 struct super_block *sb = inode->i_sb;
1247 struct buffer_head *bh;
1248 struct msdos_dir_entry *raw_entry;
1249 loff_t i_pos;
1250
1251 retry:
1252 i_pos = MSDOS_I(inode)->i_pos;
1253 if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) {
1254 return 0;
1255 }
1256 lock_kernel();
1257 if (!(bh = sb_bread(sb, i_pos >> MSDOS_SB(sb)->dir_per_block_bits))) {
1258 printk(KERN_ERR "FAT: unable to read inode block "
1259 "for updating (i_pos %lld)\n", i_pos);
1260 unlock_kernel();
1261 return -EIO;
1262 }
1263 spin_lock(&fat_inode_lock);
1264 if (i_pos != MSDOS_I(inode)->i_pos) {
1265 spin_unlock(&fat_inode_lock);
1266 brelse(bh);
1267 unlock_kernel();
1268 goto retry;
1269 }
1270
1271 raw_entry = &((struct msdos_dir_entry *) (bh->b_data))
1272 [i_pos & (MSDOS_SB(sb)->dir_per_block - 1)];
1273 if (S_ISDIR(inode->i_mode)) {
1274 raw_entry->attr = ATTR_DIR;
1275 raw_entry->size = 0;
1276 }
1277 else {
1278 raw_entry->attr = ATTR_NONE;
1279 raw_entry->size = CT_LE_L(inode->i_size);
1280 }
1281 raw_entry->attr |= MSDOS_MKATTR(inode->i_mode) |
1282 MSDOS_I(inode)->i_attrs;
1283 raw_entry->start = CT_LE_W(MSDOS_I(inode)->i_logstart);
1284 raw_entry->starthi = CT_LE_W(MSDOS_I(inode)->i_logstart >> 16);
1285 fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date);
1286 if (MSDOS_SB(sb)->options.isvfat) {
1287 fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate);
1288 raw_entry->ctime_ms = MSDOS_I(inode)->i_ctime_ms; /* use i_ctime.tv_nsec? */
1289 }
1290 spin_unlock(&fat_inode_lock);
1291 mark_buffer_dirty(bh);
1292 brelse(bh);
1293 unlock_kernel();
1294 return 0;
1295 }
1296
1297
1298 int fat_notify_change(struct dentry * dentry, struct iattr * attr)
1299 {
1300 struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
1301 struct inode *inode = dentry->d_inode;
1302 int mask, error = 0;
1303
1304 lock_kernel();
1305
1306 /* FAT cannot truncate to a longer file */
1307 if (attr->ia_valid & ATTR_SIZE) {
1308 if (attr->ia_size > inode->i_size) {
1309 error = -EPERM;
1310 goto out;
1311 }
1312 }
1313
1314 error = inode_change_ok(inode, attr);
1315 if (error) {
1316 if (sbi->options.quiet)
1317 error = 0;
1318 goto out;
1319 }
1320
1321 if (((attr->ia_valid & ATTR_UID) &&
1322 (attr->ia_uid != sbi->options.fs_uid)) ||
1323 ((attr->ia_valid & ATTR_GID) &&
1324 (attr->ia_gid != sbi->options.fs_gid)) ||
1325 ((attr->ia_valid & ATTR_MODE) &&
1326 (attr->ia_mode & ~MSDOS_VALID_MODE)))
1327 error = -EPERM;
1328
1329 if (error) {
1330 if (sbi->options.quiet)
1331 error = 0;
1332 goto out;
1333 }
1334 error = inode_setattr(inode, attr);
1335 if (error)
1336 goto out;
1337
1338 if (S_ISDIR(inode->i_mode))
1339 mask = sbi->options.fs_dmask;
1340 else
1341 mask = sbi->options.fs_fmask;
1342 inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
1343 out:
1344 unlock_kernel();
1345 return error;
1346 }
1347 MODULE_LICENSE("GPL");
MOXA 2.6.9 from sdlinux-moxaart.tgz