Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hpfs/super.c |
| 3 | * |
| 4 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 |
| 5 | * |
| 6 | * mounting, unmounting, error handling |
| 7 | */ |
| 8 | |
| 9 | #include "hpfs_fn.h" |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/parser.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/statfs.h> |
Jeff Garzik | e18fa70 | 2006-09-24 11:13:19 -0400 | [diff] [blame] | 14 | #include <linux/magic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ |
| 17 | |
| 18 | static void mark_dirty(struct super_block *s) |
| 19 | { |
| 20 | if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) { |
| 21 | struct buffer_head *bh; |
| 22 | struct hpfs_spare_block *sb; |
| 23 | if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { |
| 24 | sb->dirty = 1; |
| 25 | sb->old_wrote = 0; |
| 26 | mark_buffer_dirty(bh); |
| 27 | brelse(bh); |
| 28 | } |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there |
| 33 | were errors) */ |
| 34 | |
| 35 | static void unmark_dirty(struct super_block *s) |
| 36 | { |
| 37 | struct buffer_head *bh; |
| 38 | struct hpfs_spare_block *sb; |
| 39 | if (s->s_flags & MS_RDONLY) return; |
| 40 | if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { |
| 41 | sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; |
| 42 | sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; |
| 43 | mark_buffer_dirty(bh); |
| 44 | brelse(bh); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | /* Filesystem error... */ |
Alexey Dobriyan | 352d94d | 2006-12-06 20:37:04 -0800 | [diff] [blame] | 49 | static char err_buf[1024]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Alexey Dobriyan | 352d94d | 2006-12-06 20:37:04 -0800 | [diff] [blame] | 51 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
Alexey Dobriyan | 352d94d | 2006-12-06 20:37:04 -0800 | [diff] [blame] | 53 | va_list args; |
| 54 | |
| 55 | va_start(args, fmt); |
| 56 | vsnprintf(err_buf, sizeof(err_buf), fmt, args); |
| 57 | va_end(args); |
| 58 | |
| 59 | printk("HPFS: filesystem error: %s", err_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | if (!hpfs_sb(s)->sb_was_error) { |
| 61 | if (hpfs_sb(s)->sb_err == 2) { |
| 62 | printk("; crashing the system because you wanted it\n"); |
| 63 | mark_dirty(s); |
| 64 | panic("HPFS panic"); |
| 65 | } else if (hpfs_sb(s)->sb_err == 1) { |
| 66 | if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n"); |
| 67 | else { |
| 68 | printk("; remounting read-only\n"); |
| 69 | mark_dirty(s); |
| 70 | s->s_flags |= MS_RDONLY; |
| 71 | } |
| 72 | } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n"); |
| 73 | else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); |
| 74 | } else printk("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | hpfs_sb(s)->sb_was_error = 1; |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * A little trick to detect cycles in many hpfs structures and don't let the |
| 80 | * kernel crash on corrupted filesystem. When first called, set c2 to 0. |
| 81 | * |
| 82 | * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories |
| 83 | * nested each in other, chkdsk locked up happilly. |
| 84 | */ |
| 85 | |
| 86 | int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, |
| 87 | char *msg) |
| 88 | { |
| 89 | if (*c2 && *c1 == key) { |
| 90 | hpfs_error(s, "cycle detected on key %08x in %s", key, msg); |
| 91 | return 1; |
| 92 | } |
| 93 | (*c2)++; |
| 94 | if (!((*c2 - 1) & *c2)) *c1 = key; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static void hpfs_put_super(struct super_block *s) |
| 99 | { |
| 100 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 101 | kfree(sbi->sb_cp_table); |
| 102 | kfree(sbi->sb_bmp_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | unmark_dirty(s); |
| 104 | s->s_fs_info = NULL; |
| 105 | kfree(sbi); |
| 106 | } |
| 107 | |
| 108 | unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) |
| 109 | { |
| 110 | struct quad_buffer_head qbh; |
| 111 | unsigned *bits; |
| 112 | unsigned i, count; |
| 113 | if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0; |
| 114 | count = 0; |
| 115 | for (i = 0; i < 2048 / sizeof(unsigned); i++) { |
| 116 | unsigned b; |
| 117 | if (!bits[i]) continue; |
| 118 | for (b = bits[i]; b; b>>=1) count += b & 1; |
| 119 | } |
| 120 | hpfs_brelse4(&qbh); |
| 121 | return count; |
| 122 | } |
| 123 | |
| 124 | static unsigned count_bitmaps(struct super_block *s) |
| 125 | { |
| 126 | unsigned n, count, n_bands; |
| 127 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; |
| 128 | count = 0; |
| 129 | for (n = 0; n < n_bands; n++) |
| 130 | count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]); |
| 131 | return count; |
| 132 | } |
| 133 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 134 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 136 | struct super_block *s = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
| 138 | lock_kernel(); |
| 139 | |
| 140 | /*if (sbi->sb_n_free == -1) {*/ |
| 141 | sbi->sb_n_free = count_bitmaps(s); |
| 142 | sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); |
| 143 | /*}*/ |
| 144 | buf->f_type = s->s_magic; |
| 145 | buf->f_bsize = 512; |
| 146 | buf->f_blocks = sbi->sb_fs_size; |
| 147 | buf->f_bfree = sbi->sb_n_free; |
| 148 | buf->f_bavail = sbi->sb_n_free; |
| 149 | buf->f_files = sbi->sb_dirband_size / 4; |
| 150 | buf->f_ffree = sbi->sb_n_free_dnodes; |
| 151 | buf->f_namelen = 254; |
| 152 | |
| 153 | unlock_kernel(); |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 158 | static struct kmem_cache * hpfs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | static struct inode *hpfs_alloc_inode(struct super_block *sb) |
| 161 | { |
| 162 | struct hpfs_inode_info *ei; |
Christoph Lameter | e6b4f8d | 2006-12-06 20:33:14 -0800 | [diff] [blame] | 163 | ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | if (!ei) |
| 165 | return NULL; |
| 166 | ei->vfs_inode.i_version = 1; |
| 167 | return &ei->vfs_inode; |
| 168 | } |
| 169 | |
| 170 | static void hpfs_destroy_inode(struct inode *inode) |
| 171 | { |
| 172 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
| 173 | } |
| 174 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 175 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
| 177 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; |
| 178 | |
| 179 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 180 | SLAB_CTOR_CONSTRUCTOR) { |
Ingo Molnar | 7bf6d78 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 181 | mutex_init(&ei->i_mutex); |
| 182 | mutex_init(&ei->i_parent_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | inode_init_once(&ei->vfs_inode); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static int init_inodecache(void) |
| 188 | { |
| 189 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", |
| 190 | sizeof(struct hpfs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 191 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 192 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | init_once, NULL); |
| 194 | if (hpfs_inode_cachep == NULL) |
| 195 | return -ENOMEM; |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static void destroy_inodecache(void) |
| 200 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 201 | kmem_cache_destroy(hpfs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | /* |
| 205 | * A tiny parser for option strings, stolen from dosfs. |
| 206 | * Stolen again from read-only hpfs. |
| 207 | * And updated for table-driven option parsing. |
| 208 | */ |
| 209 | |
| 210 | enum { |
| 211 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, |
| 212 | Opt_conv_binary, Opt_conv_text, Opt_conv_auto, |
| 213 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
| 214 | Opt_err_cont, Opt_err_ro, Opt_err_panic, |
| 215 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, |
| 216 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, |
| 217 | Opt_timeshift, Opt_err, |
| 218 | }; |
| 219 | |
| 220 | static match_table_t tokens = { |
| 221 | {Opt_help, "help"}, |
| 222 | {Opt_uid, "uid=%u"}, |
| 223 | {Opt_gid, "gid=%u"}, |
| 224 | {Opt_umask, "umask=%o"}, |
| 225 | {Opt_case_lower, "case=lower"}, |
| 226 | {Opt_case_asis, "case=asis"}, |
| 227 | {Opt_conv_binary, "conv=binary"}, |
| 228 | {Opt_conv_text, "conv=text"}, |
| 229 | {Opt_conv_auto, "conv=auto"}, |
| 230 | {Opt_check_none, "check=none"}, |
| 231 | {Opt_check_normal, "check=normal"}, |
| 232 | {Opt_check_strict, "check=strict"}, |
| 233 | {Opt_err_cont, "errors=continue"}, |
| 234 | {Opt_err_ro, "errors=remount-ro"}, |
| 235 | {Opt_err_panic, "errors=panic"}, |
| 236 | {Opt_eas_no, "eas=no"}, |
| 237 | {Opt_eas_ro, "eas=ro"}, |
| 238 | {Opt_eas_rw, "eas=rw"}, |
| 239 | {Opt_chkdsk_no, "chkdsk=no"}, |
| 240 | {Opt_chkdsk_errors, "chkdsk=errors"}, |
| 241 | {Opt_chkdsk_always, "chkdsk=always"}, |
| 242 | {Opt_timeshift, "timeshift=%d"}, |
| 243 | {Opt_err, NULL}, |
| 244 | }; |
| 245 | |
| 246 | static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask, |
| 247 | int *lowercase, int *conv, int *eas, int *chk, int *errs, |
| 248 | int *chkdsk, int *timeshift) |
| 249 | { |
| 250 | char *p; |
| 251 | int option; |
| 252 | |
| 253 | if (!opts) |
| 254 | return 1; |
| 255 | |
| 256 | /*printk("Parsing opts: '%s'\n",opts);*/ |
| 257 | |
| 258 | while ((p = strsep(&opts, ",")) != NULL) { |
| 259 | substring_t args[MAX_OPT_ARGS]; |
| 260 | int token; |
| 261 | if (!*p) |
| 262 | continue; |
| 263 | |
| 264 | token = match_token(p, tokens, args); |
| 265 | switch (token) { |
| 266 | case Opt_help: |
| 267 | return 2; |
| 268 | case Opt_uid: |
| 269 | if (match_int(args, &option)) |
| 270 | return 0; |
| 271 | *uid = option; |
| 272 | break; |
| 273 | case Opt_gid: |
| 274 | if (match_int(args, &option)) |
| 275 | return 0; |
| 276 | *gid = option; |
| 277 | break; |
| 278 | case Opt_umask: |
| 279 | if (match_octal(args, &option)) |
| 280 | return 0; |
| 281 | *umask = option; |
| 282 | break; |
| 283 | case Opt_case_lower: |
| 284 | *lowercase = 1; |
| 285 | break; |
| 286 | case Opt_case_asis: |
| 287 | *lowercase = 0; |
| 288 | break; |
| 289 | case Opt_conv_binary: |
| 290 | *conv = CONV_BINARY; |
| 291 | break; |
| 292 | case Opt_conv_text: |
| 293 | *conv = CONV_TEXT; |
| 294 | break; |
| 295 | case Opt_conv_auto: |
| 296 | *conv = CONV_AUTO; |
| 297 | break; |
| 298 | case Opt_check_none: |
| 299 | *chk = 0; |
| 300 | break; |
| 301 | case Opt_check_normal: |
| 302 | *chk = 1; |
| 303 | break; |
| 304 | case Opt_check_strict: |
| 305 | *chk = 2; |
| 306 | break; |
| 307 | case Opt_err_cont: |
| 308 | *errs = 0; |
| 309 | break; |
| 310 | case Opt_err_ro: |
| 311 | *errs = 1; |
| 312 | break; |
| 313 | case Opt_err_panic: |
| 314 | *errs = 2; |
| 315 | break; |
| 316 | case Opt_eas_no: |
| 317 | *eas = 0; |
| 318 | break; |
| 319 | case Opt_eas_ro: |
| 320 | *eas = 1; |
| 321 | break; |
| 322 | case Opt_eas_rw: |
| 323 | *eas = 2; |
| 324 | break; |
| 325 | case Opt_chkdsk_no: |
| 326 | *chkdsk = 0; |
| 327 | break; |
| 328 | case Opt_chkdsk_errors: |
| 329 | *chkdsk = 1; |
| 330 | break; |
| 331 | case Opt_chkdsk_always: |
| 332 | *chkdsk = 2; |
| 333 | break; |
| 334 | case Opt_timeshift: |
| 335 | { |
| 336 | int m = 1; |
| 337 | char *rhs = args[0].from; |
| 338 | if (!rhs || !*rhs) |
| 339 | return 0; |
| 340 | if (*rhs == '-') m = -1; |
| 341 | if (*rhs == '+' || *rhs == '-') rhs++; |
| 342 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; |
| 343 | if (*rhs) |
| 344 | return 0; |
| 345 | break; |
| 346 | } |
| 347 | default: |
| 348 | return 0; |
| 349 | } |
| 350 | } |
| 351 | return 1; |
| 352 | } |
| 353 | |
| 354 | static inline void hpfs_help(void) |
| 355 | { |
| 356 | printk("\n\ |
| 357 | HPFS filesystem options:\n\ |
| 358 | help do not mount and display this text\n\ |
| 359 | uid=xxx set uid of files that don't have uid specified in eas\n\ |
| 360 | gid=xxx set gid of files that don't have gid specified in eas\n\ |
| 361 | umask=xxx set mode of files that don't have mode specified in eas\n\ |
| 362 | case=lower lowercase all files\n\ |
| 363 | case=asis do not lowercase files (default)\n\ |
| 364 | conv=binary do not convert CR/LF -> LF (default)\n\ |
| 365 | conv=auto convert only files with known text extensions\n\ |
| 366 | conv=text convert all files\n\ |
| 367 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
| 368 | check=normal do some checks - it should not crash (default)\n\ |
| 369 | check=strict do extra time-consuming checks, used for debugging\n\ |
| 370 | errors=continue continue on errors\n\ |
| 371 | errors=remount-ro remount read-only if errors found (default)\n\ |
| 372 | errors=panic panic on errors\n\ |
| 373 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ |
| 374 | chkdsk=errors mark fs dirty if errors found (default)\n\ |
| 375 | chkdsk=always always mark fs dirty - used for debugging\n\ |
| 376 | eas=no ignore extended attributes\n\ |
| 377 | eas=ro read but do not write extended attributes\n\ |
| 378 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ |
| 379 | timeshift=nnn add nnn seconds to file times\n\ |
| 380 | \n"); |
| 381 | } |
| 382 | |
| 383 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) |
| 384 | { |
| 385 | uid_t uid; |
| 386 | gid_t gid; |
| 387 | umode_t umask; |
| 388 | int lowercase, conv, eas, chk, errs, chkdsk, timeshift; |
| 389 | int o; |
| 390 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
| 391 | |
| 392 | *flags |= MS_NOATIME; |
| 393 | |
| 394 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
| 395 | umask = 0777 & ~sbi->sb_mode; |
| 396 | lowercase = sbi->sb_lowercase; conv = sbi->sb_conv; |
| 397 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
| 398 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; |
| 399 | |
| 400 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv, |
| 401 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
| 402 | printk("HPFS: bad mount options.\n"); |
| 403 | return 1; |
| 404 | } |
| 405 | if (o == 2) { |
| 406 | hpfs_help(); |
| 407 | return 1; |
| 408 | } |
| 409 | if (timeshift != sbi->sb_timeshift) { |
| 410 | printk("HPFS: timeshift can't be changed using remount.\n"); |
| 411 | return 1; |
| 412 | } |
| 413 | |
| 414 | unmark_dirty(s); |
| 415 | |
| 416 | sbi->sb_uid = uid; sbi->sb_gid = gid; |
| 417 | sbi->sb_mode = 0777 & ~umask; |
| 418 | sbi->sb_lowercase = lowercase; sbi->sb_conv = conv; |
| 419 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
| 420 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; |
| 421 | |
| 422 | if (!(*flags & MS_RDONLY)) mark_dirty(s); |
| 423 | |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | /* Super operations */ |
| 428 | |
| 429 | static struct super_operations hpfs_sops = |
| 430 | { |
| 431 | .alloc_inode = hpfs_alloc_inode, |
| 432 | .destroy_inode = hpfs_destroy_inode, |
| 433 | .delete_inode = hpfs_delete_inode, |
| 434 | .put_super = hpfs_put_super, |
| 435 | .statfs = hpfs_statfs, |
| 436 | .remount_fs = hpfs_remount_fs, |
| 437 | }; |
| 438 | |
| 439 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) |
| 440 | { |
| 441 | struct buffer_head *bh0, *bh1, *bh2; |
| 442 | struct hpfs_boot_block *bootblock; |
| 443 | struct hpfs_super_block *superblock; |
| 444 | struct hpfs_spare_block *spareblock; |
| 445 | struct hpfs_sb_info *sbi; |
| 446 | struct inode *root; |
| 447 | |
| 448 | uid_t uid; |
| 449 | gid_t gid; |
| 450 | umode_t umask; |
| 451 | int lowercase, conv, eas, chk, errs, chkdsk, timeshift; |
| 452 | |
| 453 | dnode_secno root_dno; |
| 454 | struct hpfs_dirent *de = NULL; |
| 455 | struct quad_buffer_head qbh; |
| 456 | |
| 457 | int o; |
| 458 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 459 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (!sbi) |
| 461 | return -ENOMEM; |
| 462 | s->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | sbi->sb_bmp_dir = NULL; |
| 465 | sbi->sb_cp_table = NULL; |
| 466 | |
| 467 | init_MUTEX(&sbi->hpfs_creation_de); |
| 468 | |
| 469 | uid = current->uid; |
| 470 | gid = current->gid; |
| 471 | umask = current->fs->umask; |
| 472 | lowercase = 0; |
| 473 | conv = CONV_BINARY; |
| 474 | eas = 2; |
| 475 | chk = 1; |
| 476 | errs = 1; |
| 477 | chkdsk = 1; |
| 478 | timeshift = 0; |
| 479 | |
| 480 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv, |
| 481 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
| 482 | printk("HPFS: bad mount options.\n"); |
| 483 | goto bail0; |
| 484 | } |
| 485 | if (o==2) { |
| 486 | hpfs_help(); |
| 487 | goto bail0; |
| 488 | } |
| 489 | |
| 490 | /*sbi->sb_mounting = 1;*/ |
| 491 | sb_set_blocksize(s, 512); |
| 492 | sbi->sb_fs_size = -1; |
| 493 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; |
| 494 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; |
| 495 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; |
| 496 | |
| 497 | /* Check magics */ |
| 498 | if (/*bootblock->magic != BB_MAGIC |
| 499 | ||*/ superblock->magic != SB_MAGIC |
| 500 | || spareblock->magic != SP_MAGIC) { |
| 501 | if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); |
| 502 | goto bail4; |
| 503 | } |
| 504 | |
| 505 | /* Check version */ |
| 506 | if (!(s->s_flags & MS_RDONLY) && |
| 507 | superblock->funcversion != 2 && superblock->funcversion != 3) { |
| 508 | printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", |
| 509 | (int)superblock->version, (int)superblock->funcversion); |
| 510 | printk("HPFS: 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"); |
| 511 | goto bail4; |
| 512 | } |
| 513 | |
| 514 | s->s_flags |= MS_NOATIME; |
| 515 | |
| 516 | /* Fill superblock stuff */ |
| 517 | s->s_magic = HPFS_SUPER_MAGIC; |
| 518 | s->s_op = &hpfs_sops; |
| 519 | |
| 520 | sbi->sb_root = superblock->root; |
| 521 | sbi->sb_fs_size = superblock->n_sectors; |
| 522 | sbi->sb_bitmaps = superblock->bitmaps; |
| 523 | sbi->sb_dirband_start = superblock->dir_band_start; |
| 524 | sbi->sb_dirband_size = superblock->n_dir_band; |
| 525 | sbi->sb_dmap = superblock->dir_band_bitmap; |
| 526 | sbi->sb_uid = uid; |
| 527 | sbi->sb_gid = gid; |
| 528 | sbi->sb_mode = 0777 & ~umask; |
| 529 | sbi->sb_n_free = -1; |
| 530 | sbi->sb_n_free_dnodes = -1; |
| 531 | sbi->sb_lowercase = lowercase; |
| 532 | sbi->sb_conv = conv; |
| 533 | sbi->sb_eas = eas; |
| 534 | sbi->sb_chk = chk; |
| 535 | sbi->sb_chkdsk = chkdsk; |
| 536 | sbi->sb_err = errs; |
| 537 | sbi->sb_timeshift = timeshift; |
| 538 | sbi->sb_was_error = 0; |
| 539 | sbi->sb_cp_table = NULL; |
| 540 | sbi->sb_c_bitmap = -1; |
| 541 | sbi->sb_max_fwd_alloc = 0xffffff; |
| 542 | |
| 543 | /* Load bitmap directory */ |
| 544 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps))) |
| 545 | goto bail4; |
| 546 | |
| 547 | /* Check for general fs errors*/ |
| 548 | if (spareblock->dirty && !spareblock->old_wrote) { |
| 549 | if (errs == 2) { |
| 550 | printk("HPFS: Improperly stopped, not mounted\n"); |
| 551 | goto bail4; |
| 552 | } |
| 553 | hpfs_error(s, "improperly stopped"); |
| 554 | } |
| 555 | |
| 556 | if (!(s->s_flags & MS_RDONLY)) { |
| 557 | spareblock->dirty = 1; |
| 558 | spareblock->old_wrote = 0; |
| 559 | mark_buffer_dirty(bh2); |
| 560 | } |
| 561 | |
| 562 | if (spareblock->hotfixes_used || spareblock->n_spares_used) { |
| 563 | if (errs >= 2) { |
| 564 | printk("HPFS: Hotfixes not supported here, try chkdsk\n"); |
| 565 | mark_dirty(s); |
| 566 | goto bail4; |
| 567 | } |
| 568 | hpfs_error(s, "hotfixes not supported here, try chkdsk"); |
| 569 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); |
| 570 | else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); |
| 571 | } |
| 572 | if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) { |
| 573 | if (errs >= 2) { |
| 574 | printk("HPFS: Spare dnodes used, try chkdsk\n"); |
| 575 | mark_dirty(s); |
| 576 | goto bail4; |
| 577 | } |
| 578 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); |
| 579 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
| 580 | } |
| 581 | if (chk) { |
| 582 | unsigned a; |
| 583 | if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band || |
| 584 | superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) { |
| 585 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
| 586 | superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band); |
| 587 | goto bail4; |
| 588 | } |
| 589 | a = sbi->sb_dirband_size; |
| 590 | sbi->sb_dirband_size = 0; |
| 591 | if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") || |
| 592 | hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") || |
| 593 | hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) { |
| 594 | mark_dirty(s); |
| 595 | goto bail4; |
| 596 | } |
| 597 | sbi->sb_dirband_size = a; |
| 598 | } else printk("HPFS: You really don't want any checks? You are crazy...\n"); |
| 599 | |
| 600 | /* Load code page table */ |
| 601 | if (spareblock->n_code_pages) |
| 602 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir))) |
| 603 | printk("HPFS: Warning: code page support is disabled\n"); |
| 604 | |
| 605 | brelse(bh2); |
| 606 | brelse(bh1); |
| 607 | brelse(bh0); |
| 608 | |
| 609 | root = iget_locked(s, sbi->sb_root); |
| 610 | if (!root) |
| 611 | goto bail0; |
| 612 | hpfs_init_inode(root); |
| 613 | hpfs_read_inode(root); |
| 614 | unlock_new_inode(root); |
| 615 | s->s_root = d_alloc_root(root); |
| 616 | if (!s->s_root) { |
| 617 | iput(root); |
| 618 | goto bail0; |
| 619 | } |
| 620 | hpfs_set_dentry_operations(s->s_root); |
| 621 | |
| 622 | /* |
| 623 | * find the root directory's . pointer & finish filling in the inode |
| 624 | */ |
| 625 | |
| 626 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); |
| 627 | if (root_dno) |
| 628 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); |
| 629 | if (!de) |
| 630 | hpfs_error(s, "unable to find root dir"); |
| 631 | else { |
| 632 | root->i_atime.tv_sec = local_to_gmt(s, de->read_date); |
| 633 | root->i_atime.tv_nsec = 0; |
| 634 | root->i_mtime.tv_sec = local_to_gmt(s, de->write_date); |
| 635 | root->i_mtime.tv_nsec = 0; |
| 636 | root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date); |
| 637 | root->i_ctime.tv_nsec = 0; |
| 638 | hpfs_i(root)->i_ea_size = de->ea_size; |
| 639 | hpfs_i(root)->i_parent_dir = root->i_ino; |
| 640 | if (root->i_size == -1) |
| 641 | root->i_size = 2048; |
| 642 | if (root->i_blocks == -1) |
| 643 | root->i_blocks = 5; |
| 644 | hpfs_brelse4(&qbh); |
| 645 | } |
| 646 | return 0; |
| 647 | |
| 648 | bail4: brelse(bh2); |
| 649 | bail3: brelse(bh1); |
| 650 | bail2: brelse(bh0); |
| 651 | bail1: |
| 652 | bail0: |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 653 | kfree(sbi->sb_bmp_dir); |
| 654 | kfree(sbi->sb_cp_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | s->s_fs_info = NULL; |
| 656 | kfree(sbi); |
| 657 | return -EINVAL; |
| 658 | } |
| 659 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 660 | static int hpfs_get_sb(struct file_system_type *fs_type, |
| 661 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 663 | return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super, |
| 664 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | static struct file_system_type hpfs_fs_type = { |
| 668 | .owner = THIS_MODULE, |
| 669 | .name = "hpfs", |
| 670 | .get_sb = hpfs_get_sb, |
| 671 | .kill_sb = kill_block_super, |
| 672 | .fs_flags = FS_REQUIRES_DEV, |
| 673 | }; |
| 674 | |
| 675 | static int __init init_hpfs_fs(void) |
| 676 | { |
| 677 | int err = init_inodecache(); |
| 678 | if (err) |
| 679 | goto out1; |
| 680 | err = register_filesystem(&hpfs_fs_type); |
| 681 | if (err) |
| 682 | goto out; |
| 683 | return 0; |
| 684 | out: |
| 685 | destroy_inodecache(); |
| 686 | out1: |
| 687 | return err; |
| 688 | } |
| 689 | |
| 690 | static void __exit exit_hpfs_fs(void) |
| 691 | { |
| 692 | unregister_filesystem(&hpfs_fs_type); |
| 693 | destroy_inodecache(); |
| 694 | } |
| 695 | |
| 696 | module_init(init_hpfs_fs) |
| 697 | module_exit(exit_hpfs_fs) |
| 698 | MODULE_LICENSE("GPL"); |