1 /* 2 * linux/fs/minix/inode.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * 6 * Copyright (C) 1996 Gertjan van Wingerde 7 * Minix V2 fs support. 8 * 9 * Modified for 680x0 by Andreas Schwab 10 * Updated to filesystem version 3 by Daniel Aragones 11 */ 12 13 #include <linux/module.h> 14 #include "minix.h" 15 #include <linux/buffer_head.h> 16 #include <linux/slab.h> 17 #include <linux/init.h> 18 #include <linux/highuid.h> 19 #include <linux/vfs.h> 20 #include <linux/writeback.h> 21 22 static int minix_write_inode(struct inode *inode, 23 struct writeback_control *wbc); 24 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 25 static int minix_remount (struct super_block * sb, int * flags, char * data); 26 27 static void minix_evict_inode(struct inode *inode) 28 { 29 truncate_inode_pages(&inode->i_data, 0); 30 if (!inode->i_nlink) { 31 inode->i_size = 0; 32 minix_truncate(inode); 33 } 34 invalidate_inode_buffers(inode); 35 end_writeback(inode); 36 if (!inode->i_nlink) 37 minix_free_inode(inode); 38 } 39 40 static void minix_put_super(struct super_block *sb) 41 { 42 int i; 43 struct minix_sb_info *sbi = minix_sb(sb); 44 45 if (!(sb->s_flags & MS_RDONLY)) { 46 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 47 sbi->s_ms->s_state = sbi->s_mount_state; 48 mark_buffer_dirty(sbi->s_sbh); 49 } 50 for (i = 0; i < sbi->s_imap_blocks; i++) 51 brelse(sbi->s_imap[i]); 52 for (i = 0; i < sbi->s_zmap_blocks; i++) 53 brelse(sbi->s_zmap[i]); 54 brelse (sbi->s_sbh); 55 kfree(sbi->s_imap); 56 sb->s_fs_info = NULL; 57 kfree(sbi); 58 } 59 60 static struct kmem_cache * minix_inode_cachep; 61 62 static struct inode *minix_alloc_inode(struct super_block *sb) 63 { 64 struct minix_inode_info *ei; 65 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); 66 if (!ei) 67 return NULL; 68 return &ei->vfs_inode; 69 } 70 71 static void minix_i_callback(struct rcu_head *head) 72 { 73 struct inode *inode = container_of(head, struct inode, i_rcu); 74 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 75 } 76 77 static void minix_destroy_inode(struct inode *inode) 78 { 79 call_rcu(&inode->i_rcu, minix_i_callback); 80 } 81 82 static void init_once(void *foo) 83 { 84 struct minix_inode_info *ei = (struct minix_inode_info *) foo; 85 86 inode_init_once(&ei->vfs_inode); 87 } 88 89 static int init_inodecache(void) 90 { 91 minix_inode_cachep = kmem_cache_create("minix_inode_cache", 92 sizeof(struct minix_inode_info), 93 0, (SLAB_RECLAIM_ACCOUNT| 94 SLAB_MEM_SPREAD), 95 init_once); 96 if (minix_inode_cachep == NULL) 97 return -ENOMEM; 98 return 0; 99 } 100 101 static void destroy_inodecache(void) 102 { 103 kmem_cache_destroy(minix_inode_cachep); 104 } 105 106 static const struct super_operations minix_sops = { 107 .alloc_inode = minix_alloc_inode, 108 .destroy_inode = minix_destroy_inode, 109 .write_inode = minix_write_inode, 110 .evict_inode = minix_evict_inode, 111 .put_super = minix_put_super, 112 .statfs = minix_statfs, 113 .remount_fs = minix_remount, 114 }; 115 116 static int minix_remount (struct super_block * sb, int * flags, char * data) 117 { 118 struct minix_sb_info * sbi = minix_sb(sb); 119 struct minix_super_block * ms; 120 121 ms = sbi->s_ms; 122 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 123 return 0; 124 if (*flags & MS_RDONLY) { 125 if (ms->s_state & MINIX_VALID_FS || 126 !(sbi->s_mount_state & MINIX_VALID_FS)) 127 return 0; 128 /* Mounting a rw partition read-only. */ 129 if (sbi->s_version != MINIX_V3) 130 ms->s_state = sbi->s_mount_state; 131 mark_buffer_dirty(sbi->s_sbh); 132 } else { 133 /* Mount a partition which is read-only, read-write. */ 134 if (sbi->s_version != MINIX_V3) { 135 sbi->s_mount_state = ms->s_state; 136 ms->s_state &= ~MINIX_VALID_FS; 137 } else { 138 sbi->s_mount_state = MINIX_VALID_FS; 139 } 140 mark_buffer_dirty(sbi->s_sbh); 141 142 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 143 printk("MINIX-fs warning: remounting unchecked fs, " 144 "running fsck is recommended\n"); 145 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 146 printk("MINIX-fs warning: remounting fs with errors, " 147 "running fsck is recommended\n"); 148 } 149 return 0; 150 } 151 152 static int minix_fill_super(struct super_block *s, void *data, int silent) 153 { 154 struct buffer_head *bh; 155 struct buffer_head **map; 156 struct minix_super_block *ms; 157 struct minix3_super_block *m3s = NULL; 158 unsigned long i, block; 159 struct inode *root_inode; 160 struct minix_sb_info *sbi; 161 int ret = -EINVAL; 162 163 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 164 if (!sbi) 165 return -ENOMEM; 166 s->s_fs_info = sbi; 167 168 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 169 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 170 171 if (!sb_set_blocksize(s, BLOCK_SIZE)) 172 goto out_bad_hblock; 173 174 if (!(bh = sb_bread(s, 1))) 175 goto out_bad_sb; 176 177 ms = (struct minix_super_block *) bh->b_data; 178 sbi->s_ms = ms; 179 sbi->s_sbh = bh; 180 sbi->s_mount_state = ms->s_state; 181 sbi->s_ninodes = ms->s_ninodes; 182 sbi->s_nzones = ms->s_nzones; 183 sbi->s_imap_blocks = ms->s_imap_blocks; 184 sbi->s_zmap_blocks = ms->s_zmap_blocks; 185 sbi->s_firstdatazone = ms->s_firstdatazone; 186 sbi->s_log_zone_size = ms->s_log_zone_size; 187 sbi->s_max_size = ms->s_max_size; 188 s->s_magic = ms->s_magic; 189 if (s->s_magic == MINIX_SUPER_MAGIC) { 190 sbi->s_version = MINIX_V1; 191 sbi->s_dirsize = 16; 192 sbi->s_namelen = 14; 193 sbi->s_link_max = MINIX_LINK_MAX; 194 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 195 sbi->s_version = MINIX_V1; 196 sbi->s_dirsize = 32; 197 sbi->s_namelen = 30; 198 sbi->s_link_max = MINIX_LINK_MAX; 199 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 200 sbi->s_version = MINIX_V2; 201 sbi->s_nzones = ms->s_zones; 202 sbi->s_dirsize = 16; 203 sbi->s_namelen = 14; 204 sbi->s_link_max = MINIX2_LINK_MAX; 205 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 206 sbi->s_version = MINIX_V2; 207 sbi->s_nzones = ms->s_zones; 208 sbi->s_dirsize = 32; 209 sbi->s_namelen = 30; 210 sbi->s_link_max = MINIX2_LINK_MAX; 211 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 212 m3s = (struct minix3_super_block *) bh->b_data; 213 s->s_magic = m3s->s_magic; 214 sbi->s_imap_blocks = m3s->s_imap_blocks; 215 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 216 sbi->s_firstdatazone = m3s->s_firstdatazone; 217 sbi->s_log_zone_size = m3s->s_log_zone_size; 218 sbi->s_max_size = m3s->s_max_size; 219 sbi->s_ninodes = m3s->s_ninodes; 220 sbi->s_nzones = m3s->s_zones; 221 sbi->s_dirsize = 64; 222 sbi->s_namelen = 60; 223 sbi->s_version = MINIX_V3; 224 sbi->s_link_max = MINIX2_LINK_MAX; 225 sbi->s_mount_state = MINIX_VALID_FS; 226 sb_set_blocksize(s, m3s->s_blocksize); 227 } else 228 goto out_no_fs; 229 230 /* 231 * Allocate the buffer map to keep the superblock small. 232 */ 233 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) 234 goto out_illegal_sb; 235 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 236 map = kzalloc(i, GFP_KERNEL); 237 if (!map) 238 goto out_no_map; 239 sbi->s_imap = &map[0]; 240 sbi->s_zmap = &map[sbi->s_imap_blocks]; 241 242 block=2; 243 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 244 if (!(sbi->s_imap[i]=sb_bread(s, block))) 245 goto out_no_bitmap; 246 block++; 247 } 248 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 249 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 250 goto out_no_bitmap; 251 block++; 252 } 253 254 minix_set_bit(0,sbi->s_imap[0]->b_data); 255 minix_set_bit(0,sbi->s_zmap[0]->b_data); 256 257 /* set up enough so that it can read an inode */ 258 s->s_op = &minix_sops; 259 root_inode = minix_iget(s, MINIX_ROOT_INO); 260 if (IS_ERR(root_inode)) { 261 ret = PTR_ERR(root_inode); 262 goto out_no_root; 263 } 264 265 /* Apparently minix can create filesystems that allocate more blocks for 266 * the bitmaps than needed. We simply ignore that, but verify it didn't 267 * create one with not enough blocks and bail out if so. 268 */ 269 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 270 if (sbi->s_imap_blocks < block) { 271 printk("MINIX-fs: file system does not have enough " 272 "imap blocks allocated. Refusing to mount\n"); 273 goto out_iput; 274 } 275 276 block = minix_blocks_needed( 277 (sbi->s_nzones - (sbi->s_firstdatazone + 1)), 278 s->s_blocksize); 279 if (sbi->s_zmap_blocks < block) { 280 printk("MINIX-fs: file system does not have enough " 281 "zmap blocks allocated. Refusing to mount.\n"); 282 goto out_iput; 283 } 284 285 ret = -ENOMEM; 286 s->s_root = d_alloc_root(root_inode); 287 if (!s->s_root) 288 goto out_iput; 289 290 if (!(s->s_flags & MS_RDONLY)) { 291 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 292 ms->s_state &= ~MINIX_VALID_FS; 293 mark_buffer_dirty(bh); 294 } 295 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 296 printk("MINIX-fs: mounting unchecked file system, " 297 "running fsck is recommended\n"); 298 else if (sbi->s_mount_state & MINIX_ERROR_FS) 299 printk("MINIX-fs: mounting file system with errors, " 300 "running fsck is recommended\n"); 301 302 return 0; 303 304 out_iput: 305 iput(root_inode); 306 goto out_freemap; 307 308 out_no_root: 309 if (!silent) 310 printk("MINIX-fs: get root inode failed\n"); 311 goto out_freemap; 312 313 out_no_bitmap: 314 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 315 out_freemap: 316 for (i = 0; i < sbi->s_imap_blocks; i++) 317 brelse(sbi->s_imap[i]); 318 for (i = 0; i < sbi->s_zmap_blocks; i++) 319 brelse(sbi->s_zmap[i]); 320 kfree(sbi->s_imap); 321 goto out_release; 322 323 out_no_map: 324 ret = -ENOMEM; 325 if (!silent) 326 printk("MINIX-fs: can't allocate map\n"); 327 goto out_release; 328 329 out_illegal_sb: 330 if (!silent) 331 printk("MINIX-fs: bad superblock\n"); 332 goto out_release; 333 334 out_no_fs: 335 if (!silent) 336 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 337 "on device %s.\n", s->s_id); 338 out_release: 339 brelse(bh); 340 goto out; 341 342 out_bad_hblock: 343 printk("MINIX-fs: blocksize too small for device\n"); 344 goto out; 345 346 out_bad_sb: 347 printk("MINIX-fs: unable to read superblock\n"); 348 out: 349 s->s_fs_info = NULL; 350 kfree(sbi); 351 return ret; 352 } 353 354 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 355 { 356 struct super_block *sb = dentry->d_sb; 357 struct minix_sb_info *sbi = minix_sb(sb); 358 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 359 buf->f_type = sb->s_magic; 360 buf->f_bsize = sb->s_blocksize; 361 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 362 buf->f_bfree = minix_count_free_blocks(sb); 363 buf->f_bavail = buf->f_bfree; 364 buf->f_files = sbi->s_ninodes; 365 buf->f_ffree = minix_count_free_inodes(sb); 366 buf->f_namelen = sbi->s_namelen; 367 buf->f_fsid.val[0] = (u32)id; 368 buf->f_fsid.val[1] = (u32)(id >> 32); 369 370 return 0; 371 } 372 373 static int minix_get_block(struct inode *inode, sector_t block, 374 struct buffer_head *bh_result, int create) 375 { 376 if (INODE_VERSION(inode) == MINIX_V1) 377 return V1_minix_get_block(inode, block, bh_result, create); 378 else 379 return V2_minix_get_block(inode, block, bh_result, create); 380 } 381 382 static int minix_writepage(struct page *page, struct writeback_control *wbc) 383 { 384 return block_write_full_page(page, minix_get_block, wbc); 385 } 386 387 static int minix_readpage(struct file *file, struct page *page) 388 { 389 return block_read_full_page(page,minix_get_block); 390 } 391 392 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 393 { 394 return __block_write_begin(page, pos, len, minix_get_block); 395 } 396 397 static int minix_write_begin(struct file *file, struct address_space *mapping, 398 loff_t pos, unsigned len, unsigned flags, 399 struct page **pagep, void **fsdata) 400 { 401 int ret; 402 403 ret = block_write_begin(mapping, pos, len, flags, pagep, 404 minix_get_block); 405 if (unlikely(ret)) { 406 loff_t isize = mapping->host->i_size; 407 if (pos + len > isize) 408 vmtruncate(mapping->host, isize); 409 } 410 411 return ret; 412 } 413 414 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 415 { 416 return generic_block_bmap(mapping,block,minix_get_block); 417 } 418 419 static const struct address_space_operations minix_aops = { 420 .readpage = minix_readpage, 421 .writepage = minix_writepage, 422 .write_begin = minix_write_begin, 423 .write_end = generic_write_end, 424 .bmap = minix_bmap 425 }; 426 427 static const struct inode_operations minix_symlink_inode_operations = { 428 .readlink = generic_readlink, 429 .follow_link = page_follow_link_light, 430 .put_link = page_put_link, 431 .getattr = minix_getattr, 432 }; 433 434 void minix_set_inode(struct inode *inode, dev_t rdev) 435 { 436 if (S_ISREG(inode->i_mode)) { 437 inode->i_op = &minix_file_inode_operations; 438 inode->i_fop = &minix_file_operations; 439 inode->i_mapping->a_ops = &minix_aops; 440 } else if (S_ISDIR(inode->i_mode)) { 441 inode->i_op = &minix_dir_inode_operations; 442 inode->i_fop = &minix_dir_operations; 443 inode->i_mapping->a_ops = &minix_aops; 444 } else if (S_ISLNK(inode->i_mode)) { 445 inode->i_op = &minix_symlink_inode_operations; 446 inode->i_mapping->a_ops = &minix_aops; 447 } else 448 init_special_inode(inode, inode->i_mode, rdev); 449 } 450 451 /* 452 * The minix V1 function to read an inode. 453 */ 454 static struct inode *V1_minix_iget(struct inode *inode) 455 { 456 struct buffer_head * bh; 457 struct minix_inode * raw_inode; 458 struct minix_inode_info *minix_inode = minix_i(inode); 459 int i; 460 461 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 462 if (!raw_inode) { 463 iget_failed(inode); 464 return ERR_PTR(-EIO); 465 } 466 inode->i_mode = raw_inode->i_mode; 467 inode->i_uid = (uid_t)raw_inode->i_uid; 468 inode->i_gid = (gid_t)raw_inode->i_gid; 469 set_nlink(inode, raw_inode->i_nlinks); 470 inode->i_size = raw_inode->i_size; 471 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; 472 inode->i_mtime.tv_nsec = 0; 473 inode->i_atime.tv_nsec = 0; 474 inode->i_ctime.tv_nsec = 0; 475 inode->i_blocks = 0; 476 for (i = 0; i < 9; i++) 477 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 478 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 479 brelse(bh); 480 unlock_new_inode(inode); 481 return inode; 482 } 483 484 /* 485 * The minix V2 function to read an inode. 486 */ 487 static struct inode *V2_minix_iget(struct inode *inode) 488 { 489 struct buffer_head * bh; 490 struct minix2_inode * raw_inode; 491 struct minix_inode_info *minix_inode = minix_i(inode); 492 int i; 493 494 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 495 if (!raw_inode) { 496 iget_failed(inode); 497 return ERR_PTR(-EIO); 498 } 499 inode->i_mode = raw_inode->i_mode; 500 inode->i_uid = (uid_t)raw_inode->i_uid; 501 inode->i_gid = (gid_t)raw_inode->i_gid; 502 set_nlink(inode, raw_inode->i_nlinks); 503 inode->i_size = raw_inode->i_size; 504 inode->i_mtime.tv_sec = raw_inode->i_mtime; 505 inode->i_atime.tv_sec = raw_inode->i_atime; 506 inode->i_ctime.tv_sec = raw_inode->i_ctime; 507 inode->i_mtime.tv_nsec = 0; 508 inode->i_atime.tv_nsec = 0; 509 inode->i_ctime.tv_nsec = 0; 510 inode->i_blocks = 0; 511 for (i = 0; i < 10; i++) 512 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 513 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 514 brelse(bh); 515 unlock_new_inode(inode); 516 return inode; 517 } 518 519 /* 520 * The global function to read an inode. 521 */ 522 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 523 { 524 struct inode *inode; 525 526 inode = iget_locked(sb, ino); 527 if (!inode) 528 return ERR_PTR(-ENOMEM); 529 if (!(inode->i_state & I_NEW)) 530 return inode; 531 532 if (INODE_VERSION(inode) == MINIX_V1) 533 return V1_minix_iget(inode); 534 else 535 return V2_minix_iget(inode); 536 } 537 538 /* 539 * The minix V1 function to synchronize an inode. 540 */ 541 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 542 { 543 struct buffer_head * bh; 544 struct minix_inode * raw_inode; 545 struct minix_inode_info *minix_inode = minix_i(inode); 546 int i; 547 548 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 549 if (!raw_inode) 550 return NULL; 551 raw_inode->i_mode = inode->i_mode; 552 raw_inode->i_uid = fs_high2lowuid(inode->i_uid); 553 raw_inode->i_gid = fs_high2lowgid(inode->i_gid); 554 raw_inode->i_nlinks = inode->i_nlink; 555 raw_inode->i_size = inode->i_size; 556 raw_inode->i_time = inode->i_mtime.tv_sec; 557 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 558 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 559 else for (i = 0; i < 9; i++) 560 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 561 mark_buffer_dirty(bh); 562 return bh; 563 } 564 565 /* 566 * The minix V2 function to synchronize an inode. 567 */ 568 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 569 { 570 struct buffer_head * bh; 571 struct minix2_inode * raw_inode; 572 struct minix_inode_info *minix_inode = minix_i(inode); 573 int i; 574 575 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 576 if (!raw_inode) 577 return NULL; 578 raw_inode->i_mode = inode->i_mode; 579 raw_inode->i_uid = fs_high2lowuid(inode->i_uid); 580 raw_inode->i_gid = fs_high2lowgid(inode->i_gid); 581 raw_inode->i_nlinks = inode->i_nlink; 582 raw_inode->i_size = inode->i_size; 583 raw_inode->i_mtime = inode->i_mtime.tv_sec; 584 raw_inode->i_atime = inode->i_atime.tv_sec; 585 raw_inode->i_ctime = inode->i_ctime.tv_sec; 586 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 587 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 588 else for (i = 0; i < 10; i++) 589 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 590 mark_buffer_dirty(bh); 591 return bh; 592 } 593 594 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 595 { 596 int err = 0; 597 struct buffer_head *bh; 598 599 if (INODE_VERSION(inode) == MINIX_V1) 600 bh = V1_minix_update_inode(inode); 601 else 602 bh = V2_minix_update_inode(inode); 603 if (!bh) 604 return -EIO; 605 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 606 sync_dirty_buffer(bh); 607 if (buffer_req(bh) && !buffer_uptodate(bh)) { 608 printk("IO error syncing minix inode [%s:%08lx]\n", 609 inode->i_sb->s_id, inode->i_ino); 610 err = -EIO; 611 } 612 } 613 brelse (bh); 614 return err; 615 } 616 617 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 618 { 619 struct super_block *sb = dentry->d_sb; 620 generic_fillattr(dentry->d_inode, stat); 621 if (INODE_VERSION(dentry->d_inode) == MINIX_V1) 622 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 623 else 624 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 625 stat->blksize = sb->s_blocksize; 626 return 0; 627 } 628 629 /* 630 * The function that is called for file truncation. 631 */ 632 void minix_truncate(struct inode * inode) 633 { 634 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 635 return; 636 if (INODE_VERSION(inode) == MINIX_V1) 637 V1_minix_truncate(inode); 638 else 639 V2_minix_truncate(inode); 640 } 641 642 static struct dentry *minix_mount(struct file_system_type *fs_type, 643 int flags, const char *dev_name, void *data) 644 { 645 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); 646 } 647 648 static struct file_system_type minix_fs_type = { 649 .owner = THIS_MODULE, 650 .name = "minix", 651 .mount = minix_mount, 652 .kill_sb = kill_block_super, 653 .fs_flags = FS_REQUIRES_DEV, 654 }; 655 656 static int __init init_minix_fs(void) 657 { 658 int err = init_inodecache(); 659 if (err) 660 goto out1; 661 err = register_filesystem(&minix_fs_type); 662 if (err) 663 goto out; 664 return 0; 665 out: 666 destroy_inodecache(); 667 out1: 668 return err; 669 } 670 671 static void __exit exit_minix_fs(void) 672 { 673 unregister_filesystem(&minix_fs_type); 674 destroy_inodecache(); 675 } 676 677 module_init(init_minix_fs) 678 module_exit(exit_minix_fs) 679 MODULE_LICENSE("GPL"); 680 681