1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/hpfs/super.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * mounting, unmounting, error handling
8 */
9
10 #include "hpfs_fn.h"
11 #include <linux/module.h>
12 #include <linux/fs_context.h>
13 #include <linux/fs_parser.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/magic.h>
17 #include <linux/sched.h>
18 #include <linux/bitmap.h>
19 #include <linux/slab.h>
20 #include <linux/seq_file.h>
21
22 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
23
mark_dirty(struct super_block * s,int remount)24 static void mark_dirty(struct super_block *s, int remount)
25 {
26 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
27 struct buffer_head *bh;
28 struct hpfs_spare_block *sb;
29 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
30 sb->dirty = 1;
31 sb->old_wrote = 0;
32 mark_buffer_dirty(bh);
33 sync_dirty_buffer(bh);
34 brelse(bh);
35 }
36 }
37 }
38
39 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
40 were errors) */
41
unmark_dirty(struct super_block * s)42 static void unmark_dirty(struct super_block *s)
43 {
44 struct buffer_head *bh;
45 struct hpfs_spare_block *sb;
46 if (sb_rdonly(s)) return;
47 sync_blockdev(s->s_bdev);
48 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
49 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
50 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
51 mark_buffer_dirty(bh);
52 sync_dirty_buffer(bh);
53 brelse(bh);
54 }
55 }
56
57 /* Filesystem error... */
hpfs_error(struct super_block * s,const char * fmt,...)58 void hpfs_error(struct super_block *s, const char *fmt, ...)
59 {
60 struct va_format vaf;
61 va_list args;
62
63 va_start(args, fmt);
64
65 vaf.fmt = fmt;
66 vaf.va = &args;
67
68 pr_err("filesystem error: %pV", &vaf);
69
70 va_end(args);
71
72 if (!hpfs_sb(s)->sb_was_error) {
73 if (hpfs_sb(s)->sb_err == 2) {
74 pr_cont("; crashing the system because you wanted it\n");
75 mark_dirty(s, 0);
76 panic("HPFS panic");
77 } else if (hpfs_sb(s)->sb_err == 1) {
78 if (sb_rdonly(s))
79 pr_cont("; already mounted read-only\n");
80 else {
81 pr_cont("; remounting read-only\n");
82 mark_dirty(s, 0);
83 s->s_flags |= SB_RDONLY;
84 }
85 } else if (sb_rdonly(s))
86 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
87 else
88 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
89 } else
90 pr_cont("\n");
91 hpfs_sb(s)->sb_was_error = 1;
92 }
93
94 /*
95 * A little trick to detect cycles in many hpfs structures and don't let the
96 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
97 *
98 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
99 * nested each in other, chkdsk locked up happilly.
100 */
101
hpfs_stop_cycles(struct super_block * s,int key,int * c1,int * c2,char * msg)102 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
103 char *msg)
104 {
105 if (*c2 && *c1 == key) {
106 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
107 return 1;
108 }
109 (*c2)++;
110 if (!((*c2 - 1) & *c2)) *c1 = key;
111 return 0;
112 }
113
free_sbi(struct hpfs_sb_info * sbi)114 static void free_sbi(struct hpfs_sb_info *sbi)
115 {
116 kfree(sbi->sb_cp_table);
117 kfree(sbi->sb_bmp_dir);
118 kfree(sbi);
119 }
120
lazy_free_sbi(struct rcu_head * rcu)121 static void lazy_free_sbi(struct rcu_head *rcu)
122 {
123 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
124 }
125
hpfs_put_super(struct super_block * s)126 static void hpfs_put_super(struct super_block *s)
127 {
128 hpfs_lock(s);
129 unmark_dirty(s);
130 hpfs_unlock(s);
131 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
132 }
133
hpfs_count_one_bitmap(struct super_block * s,secno secno)134 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
135 {
136 struct quad_buffer_head qbh;
137 unsigned long *bits;
138 unsigned count;
139
140 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
141 if (!bits)
142 return (unsigned)-1;
143 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
144 hpfs_brelse4(&qbh);
145 return count;
146 }
147
count_bitmaps(struct super_block * s)148 static unsigned count_bitmaps(struct super_block *s)
149 {
150 unsigned n, count, n_bands;
151 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
152 count = 0;
153 for (n = 0; n < COUNT_RD_AHEAD; n++) {
154 hpfs_prefetch_bitmap(s, n);
155 }
156 for (n = 0; n < n_bands; n++) {
157 unsigned c;
158 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
159 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
160 if (c != (unsigned)-1)
161 count += c;
162 }
163 return count;
164 }
165
hpfs_get_free_dnodes(struct super_block * s)166 unsigned hpfs_get_free_dnodes(struct super_block *s)
167 {
168 struct hpfs_sb_info *sbi = hpfs_sb(s);
169 if (sbi->sb_n_free_dnodes == (unsigned)-1) {
170 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
171 if (c == (unsigned)-1)
172 return 0;
173 sbi->sb_n_free_dnodes = c;
174 }
175 return sbi->sb_n_free_dnodes;
176 }
177
hpfs_statfs(struct dentry * dentry,struct kstatfs * buf)178 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
179 {
180 struct super_block *s = dentry->d_sb;
181 struct hpfs_sb_info *sbi = hpfs_sb(s);
182 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
183
184 hpfs_lock(s);
185
186 if (sbi->sb_n_free == (unsigned)-1)
187 sbi->sb_n_free = count_bitmaps(s);
188
189 buf->f_type = s->s_magic;
190 buf->f_bsize = 512;
191 buf->f_blocks = sbi->sb_fs_size;
192 buf->f_bfree = sbi->sb_n_free;
193 buf->f_bavail = sbi->sb_n_free;
194 buf->f_files = sbi->sb_dirband_size / 4;
195 buf->f_ffree = hpfs_get_free_dnodes(s);
196 buf->f_fsid = u64_to_fsid(id);
197 buf->f_namelen = 254;
198
199 hpfs_unlock(s);
200
201 return 0;
202 }
203
204
hpfs_ioctl(struct file * file,unsigned cmd,unsigned long arg)205 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
206 {
207 switch (cmd) {
208 case FITRIM: {
209 struct fstrim_range range;
210 secno n_trimmed;
211 int r;
212 if (!capable(CAP_SYS_ADMIN))
213 return -EPERM;
214 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
215 return -EFAULT;
216 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
217 if (r)
218 return r;
219 range.len = (u64)n_trimmed << 9;
220 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
221 return -EFAULT;
222 return 0;
223 }
224 default: {
225 return -ENOIOCTLCMD;
226 }
227 }
228 }
229
230
231 static struct kmem_cache * hpfs_inode_cachep;
232
hpfs_alloc_inode(struct super_block * sb)233 static struct inode *hpfs_alloc_inode(struct super_block *sb)
234 {
235 struct hpfs_inode_info *ei;
236 ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS);
237 if (!ei)
238 return NULL;
239 return &ei->vfs_inode;
240 }
241
hpfs_free_inode(struct inode * inode)242 static void hpfs_free_inode(struct inode *inode)
243 {
244 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
245 }
246
init_once(void * foo)247 static void init_once(void *foo)
248 {
249 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
250
251 inode_init_once(&ei->vfs_inode);
252 }
253
init_inodecache(void)254 static int init_inodecache(void)
255 {
256 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
257 sizeof(struct hpfs_inode_info),
258 0, (SLAB_RECLAIM_ACCOUNT|
259 SLAB_ACCOUNT),
260 init_once);
261 if (hpfs_inode_cachep == NULL)
262 return -ENOMEM;
263 return 0;
264 }
265
destroy_inodecache(void)266 static void destroy_inodecache(void)
267 {
268 /*
269 * Make sure all delayed rcu free inodes are flushed before we
270 * destroy cache.
271 */
272 rcu_barrier();
273 kmem_cache_destroy(hpfs_inode_cachep);
274 }
275
276 enum {
277 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case,
278 Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift,
279 };
280
281 static const struct constant_table hpfs_param_case[] = {
282 {"asis", 0},
283 {"lower", 1},
284 {}
285 };
286
287 static const struct constant_table hpfs_param_check[] = {
288 {"none", 0},
289 {"normal", 1},
290 {"strict", 2},
291 {}
292 };
293
294 static const struct constant_table hpfs_param_err[] = {
295 {"continue", 0},
296 {"remount-ro", 1},
297 {"panic", 2},
298 {}
299 };
300
301 static const struct constant_table hpfs_param_eas[] = {
302 {"no", 0},
303 {"ro", 1},
304 {"rw", 2},
305 {}
306 };
307
308 static const struct constant_table hpfs_param_chkdsk[] = {
309 {"no", 0},
310 {"errors", 1},
311 {"always", 2},
312 {}
313 };
314
315 static const struct fs_parameter_spec hpfs_param_spec[] = {
316 fsparam_flag ("help", Opt_help),
317 fsparam_uid ("uid", Opt_uid),
318 fsparam_gid ("gid", Opt_gid),
319 fsparam_u32oct ("umask", Opt_umask),
320 fsparam_enum ("case", Opt_case, hpfs_param_case),
321 fsparam_enum ("check", Opt_check, hpfs_param_check),
322 fsparam_enum ("errors", Opt_err, hpfs_param_err),
323 fsparam_enum ("eas", Opt_eas, hpfs_param_eas),
324 fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk),
325 fsparam_s32 ("timeshift", Opt_timeshift),
326 {}
327 };
328
329 struct hpfs_fc_context {
330 kuid_t uid;
331 kgid_t gid;
332 umode_t umask;
333 int lowercase;
334 int eas;
335 int chk;
336 int errs;
337 int chkdsk;
338 int timeshift;
339 };
340
hpfs_help(void)341 static inline void hpfs_help(void)
342 {
343 pr_info("\n\
344 HPFS filesystem options:\n\
345 help do not mount and display this text\n\
346 uid=xxx set uid of files that don't have uid specified in eas\n\
347 gid=xxx set gid of files that don't have gid specified in eas\n\
348 umask=xxx set mode of files that don't have mode specified in eas\n\
349 case=lower lowercase all files\n\
350 case=asis do not lowercase files (default)\n\
351 check=none no fs checks - kernel may crash on corrupted filesystem\n\
352 check=normal do some checks - it should not crash (default)\n\
353 check=strict do extra time-consuming checks, used for debugging\n\
354 errors=continue continue on errors\n\
355 errors=remount-ro remount read-only if errors found (default)\n\
356 errors=panic panic on errors\n\
357 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
358 chkdsk=errors mark fs dirty if errors found (default)\n\
359 chkdsk=always always mark fs dirty - used for debugging\n\
360 eas=no ignore extended attributes\n\
361 eas=ro read but do not write extended attributes\n\
362 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
363 timeshift=nnn add nnn seconds to file times\n\
364 \n");
365 }
366
hpfs_parse_param(struct fs_context * fc,struct fs_parameter * param)367 static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
368 {
369 struct hpfs_fc_context *ctx = fc->fs_private;
370 struct fs_parse_result result;
371 int opt;
372
373 opt = fs_parse(fc, hpfs_param_spec, param, &result);
374 if (opt < 0)
375 return opt;
376
377 switch (opt) {
378 case Opt_help:
379 hpfs_help();
380 return -EINVAL;
381 case Opt_uid:
382 ctx->uid = result.uid;
383 break;
384 case Opt_gid:
385 ctx->gid = result.gid;
386 break;
387 case Opt_umask:
388 ctx->umask = result.uint_32;
389 break;
390 case Opt_case:
391 ctx->lowercase = result.uint_32;
392 break;
393 case Opt_check:
394 ctx->chk = result.uint_32;
395 break;
396 case Opt_err:
397 ctx->errs = result.uint_32;
398 break;
399 case Opt_eas:
400 ctx->eas = result.uint_32;
401 break;
402 case Opt_chkdsk:
403 ctx->chkdsk = result.uint_32;
404 break;
405 case Opt_timeshift:
406 {
407 char *rhs = param->string;
408 int timeshift;
409
410 if (kstrtoint(rhs, 0, ×hift))
411 return -EINVAL;
412 ctx->timeshift = timeshift;
413 break;
414 }
415 default:
416 return -EINVAL;
417 }
418
419 return 0;
420 }
421
hpfs_reconfigure(struct fs_context * fc)422 static int hpfs_reconfigure(struct fs_context *fc)
423 {
424 struct hpfs_fc_context *ctx = fc->fs_private;
425 struct super_block *s = fc->root->d_sb;
426 struct hpfs_sb_info *sbi = hpfs_sb(s);
427
428 sync_filesystem(s);
429
430 fc->sb_flags |= SB_NOATIME;
431
432 hpfs_lock(s);
433
434 if (ctx->timeshift != sbi->sb_timeshift) {
435 pr_err("timeshift can't be changed using remount.\n");
436 goto out_err;
437 }
438
439 unmark_dirty(s);
440
441 sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid;
442 sbi->sb_mode = 0777 & ~ctx->umask;
443 sbi->sb_lowercase = ctx->lowercase;
444 sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk;
445 sbi->sb_chkdsk = ctx->chkdsk;
446 sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift;
447
448 if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1);
449
450 hpfs_unlock(s);
451 return 0;
452
453 out_err:
454 hpfs_unlock(s);
455 return -EINVAL;
456 }
457
hpfs_show_options(struct seq_file * seq,struct dentry * root)458 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
459 {
460 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
461
462 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
463 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
464 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
465 if (sbi->sb_lowercase)
466 seq_printf(seq, ",case=lower");
467 if (!sbi->sb_chk)
468 seq_printf(seq, ",check=none");
469 if (sbi->sb_chk == 2)
470 seq_printf(seq, ",check=strict");
471 if (!sbi->sb_err)
472 seq_printf(seq, ",errors=continue");
473 if (sbi->sb_err == 2)
474 seq_printf(seq, ",errors=panic");
475 if (!sbi->sb_chkdsk)
476 seq_printf(seq, ",chkdsk=no");
477 if (sbi->sb_chkdsk == 2)
478 seq_printf(seq, ",chkdsk=always");
479 if (!sbi->sb_eas)
480 seq_printf(seq, ",eas=no");
481 if (sbi->sb_eas == 1)
482 seq_printf(seq, ",eas=ro");
483 if (sbi->sb_timeshift)
484 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
485 return 0;
486 }
487
488 /* Super operations */
489
490 static const struct super_operations hpfs_sops =
491 {
492 .alloc_inode = hpfs_alloc_inode,
493 .free_inode = hpfs_free_inode,
494 .evict_inode = hpfs_evict_inode,
495 .put_super = hpfs_put_super,
496 .statfs = hpfs_statfs,
497 .show_options = hpfs_show_options,
498 };
499
hpfs_fill_super(struct super_block * s,struct fs_context * fc)500 static int hpfs_fill_super(struct super_block *s, struct fs_context *fc)
501 {
502 struct hpfs_fc_context *ctx = fc->fs_private;
503 struct buffer_head *bh0, *bh1, *bh2;
504 struct hpfs_boot_block *bootblock;
505 struct hpfs_super_block *superblock;
506 struct hpfs_spare_block *spareblock;
507 struct hpfs_sb_info *sbi;
508 struct inode *root;
509 int silent = fc->sb_flags & SB_SILENT;
510
511 dnode_secno root_dno;
512 struct hpfs_dirent *de = NULL;
513 struct quad_buffer_head qbh;
514
515 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
516 if (!sbi) {
517 return -ENOMEM;
518 }
519 s->s_fs_info = sbi;
520
521 mutex_init(&sbi->hpfs_mutex);
522 hpfs_lock(s);
523
524 /*sbi->sb_mounting = 1;*/
525 sb_set_blocksize(s, 512);
526 sbi->sb_fs_size = -1;
527 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
528 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
529 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
530
531 /* Check magics */
532 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
533 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
534 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
535 if (!silent)
536 pr_err("Bad magic ... probably not HPFS\n");
537 goto bail4;
538 }
539
540 /* Check version */
541 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
542 pr_err("Bad version %d,%d. Mount readonly to go around\n",
543 (int)superblock->version, (int)superblock->funcversion);
544 pr_err("please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
545 goto bail4;
546 }
547
548 s->s_flags |= SB_NOATIME;
549
550 /* Fill superblock stuff */
551 s->s_magic = HPFS_SUPER_MAGIC;
552 s->s_op = &hpfs_sops;
553 set_default_d_op(s, &hpfs_dentry_operations);
554 s->s_time_min = local_to_gmt(s, 0);
555 s->s_time_max = local_to_gmt(s, U32_MAX);
556
557 sbi->sb_root = le32_to_cpu(superblock->root);
558 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
559 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
560 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
561 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
562 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
563 sbi->sb_uid = ctx->uid;
564 sbi->sb_gid = ctx->gid;
565 sbi->sb_mode = 0777 & ~ctx->umask;
566 sbi->sb_n_free = -1;
567 sbi->sb_n_free_dnodes = -1;
568 sbi->sb_lowercase = ctx->lowercase;
569 sbi->sb_eas = ctx->eas;
570 sbi->sb_chk = ctx->chk;
571 sbi->sb_chkdsk = ctx->chkdsk;
572 sbi->sb_err = ctx->errs;
573 sbi->sb_timeshift = ctx->timeshift;
574 sbi->sb_was_error = 0;
575 sbi->sb_cp_table = NULL;
576 sbi->sb_c_bitmap = -1;
577 sbi->sb_max_fwd_alloc = 0xffffff;
578
579 if (sbi->sb_fs_size >= 0x80000000) {
580 hpfs_error(s, "invalid size in superblock: %08x",
581 (unsigned)sbi->sb_fs_size);
582 goto bail4;
583 }
584
585 if (spareblock->n_spares_used)
586 hpfs_load_hotfix_map(s, spareblock);
587
588 /* Load bitmap directory */
589 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
590 goto bail4;
591
592 /* Check for general fs errors*/
593 if (spareblock->dirty && !spareblock->old_wrote) {
594 if (sbi->sb_err == 2) {
595 pr_err("Improperly stopped, not mounted\n");
596 goto bail4;
597 }
598 hpfs_error(s, "improperly stopped");
599 }
600
601 if (!sb_rdonly(s)) {
602 spareblock->dirty = 1;
603 spareblock->old_wrote = 0;
604 mark_buffer_dirty(bh2);
605 }
606
607 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
608 if (sbi->sb_err >= 2) {
609 pr_err("Spare dnodes used, try chkdsk\n");
610 mark_dirty(s, 0);
611 goto bail4;
612 }
613 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
614 if (sbi->sb_err == 0)
615 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
616 }
617 if (sbi->sb_chk) {
618 unsigned a;
619 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
620 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
621 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
622 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
623 goto bail4;
624 }
625 a = sbi->sb_dirband_size;
626 sbi->sb_dirband_size = 0;
627 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
628 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
629 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
630 mark_dirty(s, 0);
631 goto bail4;
632 }
633 sbi->sb_dirband_size = a;
634 } else
635 pr_err("You really don't want any checks? You are crazy...\n");
636
637 /* Load code page table */
638 if (le32_to_cpu(spareblock->n_code_pages))
639 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
640 pr_err("code page support is disabled\n");
641
642 brelse(bh2);
643 brelse(bh1);
644 brelse(bh0);
645
646 root = iget_locked(s, sbi->sb_root);
647 if (!root)
648 goto bail0;
649 hpfs_init_inode(root);
650 hpfs_read_inode(root);
651 unlock_new_inode(root);
652 s->s_root = d_make_root(root);
653 if (!s->s_root)
654 goto bail0;
655
656 /*
657 * find the root directory's . pointer & finish filling in the inode
658 */
659
660 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
661 if (root_dno)
662 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
663 if (!de)
664 hpfs_error(s, "unable to find root dir");
665 else {
666 inode_set_atime(root,
667 local_to_gmt(s, le32_to_cpu(de->read_date)),
668 0);
669 inode_set_mtime(root,
670 local_to_gmt(s, le32_to_cpu(de->write_date)),
671 0);
672 inode_set_ctime(root,
673 local_to_gmt(s, le32_to_cpu(de->creation_date)),
674 0);
675 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
676 hpfs_i(root)->i_parent_dir = root->i_ino;
677 if (root->i_size == -1)
678 root->i_size = 2048;
679 if (root->i_blocks == -1)
680 root->i_blocks = 5;
681 hpfs_brelse4(&qbh);
682 }
683 hpfs_unlock(s);
684 return 0;
685
686 bail4: brelse(bh2);
687 bail3: brelse(bh1);
688 bail2: brelse(bh0);
689 bail1:
690 bail0:
691 hpfs_unlock(s);
692 free_sbi(sbi);
693 return -EINVAL;
694 }
695
hpfs_get_tree(struct fs_context * fc)696 static int hpfs_get_tree(struct fs_context *fc)
697 {
698 return get_tree_bdev(fc, hpfs_fill_super);
699 }
700
hpfs_free_fc(struct fs_context * fc)701 static void hpfs_free_fc(struct fs_context *fc)
702 {
703 kfree(fc->fs_private);
704 }
705
706 static const struct fs_context_operations hpfs_fc_context_ops = {
707 .parse_param = hpfs_parse_param,
708 .get_tree = hpfs_get_tree,
709 .reconfigure = hpfs_reconfigure,
710 .free = hpfs_free_fc,
711 };
712
hpfs_init_fs_context(struct fs_context * fc)713 static int hpfs_init_fs_context(struct fs_context *fc)
714 {
715 struct hpfs_fc_context *ctx;
716
717 ctx = kzalloc(sizeof(struct hpfs_fc_context), GFP_KERNEL);
718 if (!ctx)
719 return -ENOMEM;
720
721 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
722 struct super_block *sb = fc->root->d_sb;
723 struct hpfs_sb_info *sbi = hpfs_sb(sb);
724
725 ctx->uid = sbi->sb_uid;
726 ctx->gid = sbi->sb_gid;
727 ctx->umask = 0777 & ~sbi->sb_mode;
728 ctx->lowercase = sbi->sb_lowercase;
729 ctx->eas = sbi->sb_eas;
730 ctx->chk = sbi->sb_chk;
731 ctx->chkdsk = sbi->sb_chkdsk;
732 ctx->errs = sbi->sb_err;
733 ctx->timeshift = sbi->sb_timeshift;
734
735 } else {
736 ctx->uid = current_uid();
737 ctx->gid = current_gid();
738 ctx->umask = current_umask();
739 ctx->lowercase = 0;
740 ctx->eas = 2;
741 ctx->chk = 1;
742 ctx->errs = 1;
743 ctx->chkdsk = 1;
744 ctx->timeshift = 0;
745 }
746
747 fc->fs_private = ctx;
748 fc->ops = &hpfs_fc_context_ops;
749
750 return 0;
751 };
752
753 static struct file_system_type hpfs_fs_type = {
754 .owner = THIS_MODULE,
755 .name = "hpfs",
756 .kill_sb = kill_block_super,
757 .fs_flags = FS_REQUIRES_DEV,
758 .init_fs_context = hpfs_init_fs_context,
759 .parameters = hpfs_param_spec,
760 };
761 MODULE_ALIAS_FS("hpfs");
762
init_hpfs_fs(void)763 static int __init init_hpfs_fs(void)
764 {
765 int err = init_inodecache();
766 if (err)
767 goto out1;
768 err = register_filesystem(&hpfs_fs_type);
769 if (err)
770 goto out;
771 return 0;
772 out:
773 destroy_inodecache();
774 out1:
775 return err;
776 }
777
exit_hpfs_fs(void)778 static void __exit exit_hpfs_fs(void)
779 {
780 unregister_filesystem(&hpfs_fs_type);
781 destroy_inodecache();
782 }
783
784 module_init(init_hpfs_fs)
785 module_exit(exit_hpfs_fs)
786 MODULE_DESCRIPTION("OS/2 HPFS file system support");
787 MODULE_LICENSE("GPL");
788