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_final(&inode->i_data); 30 if (!inode->i_nlink) { 31 inode->i_size = 0; 32 minix_truncate(inode); 33 } 34 invalidate_inode_buffers(inode); 35 clear_inode(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 = 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 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|SLAB_ACCOUNT), 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 /* 104 * Make sure all delayed rcu free inodes are flushed before we 105 * destroy cache. 106 */ 107 rcu_barrier(); 108 kmem_cache_destroy(minix_inode_cachep); 109 } 110 111 static const struct super_operations minix_sops = { 112 .alloc_inode = minix_alloc_inode, 113 .destroy_inode = minix_destroy_inode, 114 .write_inode = minix_write_inode, 115 .evict_inode = minix_evict_inode, 116 .put_super = minix_put_super, 117 .statfs = minix_statfs, 118 .remount_fs = minix_remount, 119 }; 120 121 static int minix_remount (struct super_block * sb, int * flags, char * data) 122 { 123 struct minix_sb_info * sbi = minix_sb(sb); 124 struct minix_super_block * ms; 125 126 sync_filesystem(sb); 127 ms = sbi->s_ms; 128 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 129 return 0; 130 if (*flags & MS_RDONLY) { 131 if (ms->s_state & MINIX_VALID_FS || 132 !(sbi->s_mount_state & MINIX_VALID_FS)) 133 return 0; 134 /* Mounting a rw partition read-only. */ 135 if (sbi->s_version != MINIX_V3) 136 ms->s_state = sbi->s_mount_state; 137 mark_buffer_dirty(sbi->s_sbh); 138 } else { 139 /* Mount a partition which is read-only, read-write. */ 140 if (sbi->s_version != MINIX_V3) { 141 sbi->s_mount_state = ms->s_state; 142 ms->s_state &= ~MINIX_VALID_FS; 143 } else { 144 sbi->s_mount_state = MINIX_VALID_FS; 145 } 146 mark_buffer_dirty(sbi->s_sbh); 147 148 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 149 printk("MINIX-fs warning: remounting unchecked fs, " 150 "running fsck is recommended\n"); 151 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 152 printk("MINIX-fs warning: remounting fs with errors, " 153 "running fsck is recommended\n"); 154 } 155 return 0; 156 } 157 158 static int minix_fill_super(struct super_block *s, void *data, int silent) 159 { 160 struct buffer_head *bh; 161 struct buffer_head **map; 162 struct minix_super_block *ms; 163 struct minix3_super_block *m3s = NULL; 164 unsigned long i, block; 165 struct inode *root_inode; 166 struct minix_sb_info *sbi; 167 int ret = -EINVAL; 168 169 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 170 if (!sbi) 171 return -ENOMEM; 172 s->s_fs_info = sbi; 173 174 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 175 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 176 177 if (!sb_set_blocksize(s, BLOCK_SIZE)) 178 goto out_bad_hblock; 179 180 if (!(bh = sb_bread(s, 1))) 181 goto out_bad_sb; 182 183 ms = (struct minix_super_block *) bh->b_data; 184 sbi->s_ms = ms; 185 sbi->s_sbh = bh; 186 sbi->s_mount_state = ms->s_state; 187 sbi->s_ninodes = ms->s_ninodes; 188 sbi->s_nzones = ms->s_nzones; 189 sbi->s_imap_blocks = ms->s_imap_blocks; 190 sbi->s_zmap_blocks = ms->s_zmap_blocks; 191 sbi->s_firstdatazone = ms->s_firstdatazone; 192 sbi->s_log_zone_size = ms->s_log_zone_size; 193 sbi->s_max_size = ms->s_max_size; 194 s->s_magic = ms->s_magic; 195 if (s->s_magic == MINIX_SUPER_MAGIC) { 196 sbi->s_version = MINIX_V1; 197 sbi->s_dirsize = 16; 198 sbi->s_namelen = 14; 199 s->s_max_links = MINIX_LINK_MAX; 200 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 201 sbi->s_version = MINIX_V1; 202 sbi->s_dirsize = 32; 203 sbi->s_namelen = 30; 204 s->s_max_links = MINIX_LINK_MAX; 205 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 206 sbi->s_version = MINIX_V2; 207 sbi->s_nzones = ms->s_zones; 208 sbi->s_dirsize = 16; 209 sbi->s_namelen = 14; 210 s->s_max_links = MINIX2_LINK_MAX; 211 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 212 sbi->s_version = MINIX_V2; 213 sbi->s_nzones = ms->s_zones; 214 sbi->s_dirsize = 32; 215 sbi->s_namelen = 30; 216 s->s_max_links = MINIX2_LINK_MAX; 217 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 218 m3s = (struct minix3_super_block *) bh->b_data; 219 s->s_magic = m3s->s_magic; 220 sbi->s_imap_blocks = m3s->s_imap_blocks; 221 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 222 sbi->s_firstdatazone = m3s->s_firstdatazone; 223 sbi->s_log_zone_size = m3s->s_log_zone_size; 224 sbi->s_max_size = m3s->s_max_size; 225 sbi->s_ninodes = m3s->s_ninodes; 226 sbi->s_nzones = m3s->s_zones; 227 sbi->s_dirsize = 64; 228 sbi->s_namelen = 60; 229 sbi->s_version = MINIX_V3; 230 sbi->s_mount_state = MINIX_VALID_FS; 231 sb_set_blocksize(s, m3s->s_blocksize); 232 s->s_max_links = MINIX2_LINK_MAX; 233 } else 234 goto out_no_fs; 235 236 /* 237 * Allocate the buffer map to keep the superblock small. 238 */ 239 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) 240 goto out_illegal_sb; 241 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 242 map = kzalloc(i, GFP_KERNEL); 243 if (!map) 244 goto out_no_map; 245 sbi->s_imap = &map[0]; 246 sbi->s_zmap = &map[sbi->s_imap_blocks]; 247 248 block=2; 249 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 250 if (!(sbi->s_imap[i]=sb_bread(s, block))) 251 goto out_no_bitmap; 252 block++; 253 } 254 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 255 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 256 goto out_no_bitmap; 257 block++; 258 } 259 260 minix_set_bit(0,sbi->s_imap[0]->b_data); 261 minix_set_bit(0,sbi->s_zmap[0]->b_data); 262 263 /* Apparently minix can create filesystems that allocate more blocks for 264 * the bitmaps than needed. We simply ignore that, but verify it didn't 265 * create one with not enough blocks and bail out if so. 266 */ 267 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 268 if (sbi->s_imap_blocks < block) { 269 printk("MINIX-fs: file system does not have enough " 270 "imap blocks allocated. Refusing to mount.\n"); 271 goto out_no_bitmap; 272 } 273 274 block = minix_blocks_needed( 275 (sbi->s_nzones - sbi->s_firstdatazone + 1), 276 s->s_blocksize); 277 if (sbi->s_zmap_blocks < block) { 278 printk("MINIX-fs: file system does not have enough " 279 "zmap blocks allocated. Refusing to mount.\n"); 280 goto out_no_bitmap; 281 } 282 283 /* set up enough so that it can read an inode */ 284 s->s_op = &minix_sops; 285 root_inode = minix_iget(s, MINIX_ROOT_INO); 286 if (IS_ERR(root_inode)) { 287 ret = PTR_ERR(root_inode); 288 goto out_no_root; 289 } 290 291 ret = -ENOMEM; 292 s->s_root = d_make_root(root_inode); 293 if (!s->s_root) 294 goto out_no_root; 295 296 if (!(s->s_flags & MS_RDONLY)) { 297 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 298 ms->s_state &= ~MINIX_VALID_FS; 299 mark_buffer_dirty(bh); 300 } 301 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 302 printk("MINIX-fs: mounting unchecked file system, " 303 "running fsck is recommended\n"); 304 else if (sbi->s_mount_state & MINIX_ERROR_FS) 305 printk("MINIX-fs: mounting file system with errors, " 306 "running fsck is recommended\n"); 307 308 return 0; 309 310 out_no_root: 311 if (!silent) 312 printk("MINIX-fs: get root inode failed\n"); 313 goto out_freemap; 314 315 out_no_bitmap: 316 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 317 out_freemap: 318 for (i = 0; i < sbi->s_imap_blocks; i++) 319 brelse(sbi->s_imap[i]); 320 for (i = 0; i < sbi->s_zmap_blocks; i++) 321 brelse(sbi->s_zmap[i]); 322 kfree(sbi->s_imap); 323 goto out_release; 324 325 out_no_map: 326 ret = -ENOMEM; 327 if (!silent) 328 printk("MINIX-fs: can't allocate map\n"); 329 goto out_release; 330 331 out_illegal_sb: 332 if (!silent) 333 printk("MINIX-fs: bad superblock\n"); 334 goto out_release; 335 336 out_no_fs: 337 if (!silent) 338 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 339 "on device %s.\n", s->s_id); 340 out_release: 341 brelse(bh); 342 goto out; 343 344 out_bad_hblock: 345 printk("MINIX-fs: blocksize too small for device\n"); 346 goto out; 347 348 out_bad_sb: 349 printk("MINIX-fs: unable to read superblock\n"); 350 out: 351 s->s_fs_info = NULL; 352 kfree(sbi); 353 return ret; 354 } 355 356 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 357 { 358 struct super_block *sb = dentry->d_sb; 359 struct minix_sb_info *sbi = minix_sb(sb); 360 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 361 buf->f_type = sb->s_magic; 362 buf->f_bsize = sb->s_blocksize; 363 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 364 buf->f_bfree = minix_count_free_blocks(sb); 365 buf->f_bavail = buf->f_bfree; 366 buf->f_files = sbi->s_ninodes; 367 buf->f_ffree = minix_count_free_inodes(sb); 368 buf->f_namelen = sbi->s_namelen; 369 buf->f_fsid.val[0] = (u32)id; 370 buf->f_fsid.val[1] = (u32)(id >> 32); 371 372 return 0; 373 } 374 375 static int minix_get_block(struct inode *inode, sector_t block, 376 struct buffer_head *bh_result, int create) 377 { 378 if (INODE_VERSION(inode) == MINIX_V1) 379 return V1_minix_get_block(inode, block, bh_result, create); 380 else 381 return V2_minix_get_block(inode, block, bh_result, create); 382 } 383 384 static int minix_writepage(struct page *page, struct writeback_control *wbc) 385 { 386 return block_write_full_page(page, minix_get_block, wbc); 387 } 388 389 static int minix_readpage(struct file *file, struct page *page) 390 { 391 return block_read_full_page(page,minix_get_block); 392 } 393 394 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 395 { 396 return __block_write_begin(page, pos, len, minix_get_block); 397 } 398 399 static void minix_write_failed(struct address_space *mapping, loff_t to) 400 { 401 struct inode *inode = mapping->host; 402 403 if (to > inode->i_size) { 404 truncate_pagecache(inode, inode->i_size); 405 minix_truncate(inode); 406 } 407 } 408 409 static int minix_write_begin(struct file *file, struct address_space *mapping, 410 loff_t pos, unsigned len, unsigned flags, 411 struct page **pagep, void **fsdata) 412 { 413 int ret; 414 415 ret = block_write_begin(mapping, pos, len, flags, pagep, 416 minix_get_block); 417 if (unlikely(ret)) 418 minix_write_failed(mapping, pos + len); 419 420 return ret; 421 } 422 423 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 424 { 425 return generic_block_bmap(mapping,block,minix_get_block); 426 } 427 428 static const struct address_space_operations minix_aops = { 429 .readpage = minix_readpage, 430 .writepage = minix_writepage, 431 .write_begin = minix_write_begin, 432 .write_end = generic_write_end, 433 .bmap = minix_bmap 434 }; 435 436 static const struct inode_operations minix_symlink_inode_operations = { 437 .get_link = page_get_link, 438 .getattr = minix_getattr, 439 }; 440 441 void minix_set_inode(struct inode *inode, dev_t rdev) 442 { 443 if (S_ISREG(inode->i_mode)) { 444 inode->i_op = &minix_file_inode_operations; 445 inode->i_fop = &minix_file_operations; 446 inode->i_mapping->a_ops = &minix_aops; 447 } else if (S_ISDIR(inode->i_mode)) { 448 inode->i_op = &minix_dir_inode_operations; 449 inode->i_fop = &minix_dir_operations; 450 inode->i_mapping->a_ops = &minix_aops; 451 } else if (S_ISLNK(inode->i_mode)) { 452 inode->i_op = &minix_symlink_inode_operations; 453 inode_nohighmem(inode); 454 inode->i_mapping->a_ops = &minix_aops; 455 } else 456 init_special_inode(inode, inode->i_mode, rdev); 457 } 458 459 /* 460 * The minix V1 function to read an inode. 461 */ 462 static struct inode *V1_minix_iget(struct inode *inode) 463 { 464 struct buffer_head * bh; 465 struct minix_inode * raw_inode; 466 struct minix_inode_info *minix_inode = minix_i(inode); 467 int i; 468 469 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 470 if (!raw_inode) { 471 iget_failed(inode); 472 return ERR_PTR(-EIO); 473 } 474 inode->i_mode = raw_inode->i_mode; 475 i_uid_write(inode, raw_inode->i_uid); 476 i_gid_write(inode, raw_inode->i_gid); 477 set_nlink(inode, raw_inode->i_nlinks); 478 inode->i_size = raw_inode->i_size; 479 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; 480 inode->i_mtime.tv_nsec = 0; 481 inode->i_atime.tv_nsec = 0; 482 inode->i_ctime.tv_nsec = 0; 483 inode->i_blocks = 0; 484 for (i = 0; i < 9; i++) 485 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 486 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 487 brelse(bh); 488 unlock_new_inode(inode); 489 return inode; 490 } 491 492 /* 493 * The minix V2 function to read an inode. 494 */ 495 static struct inode *V2_minix_iget(struct inode *inode) 496 { 497 struct buffer_head * bh; 498 struct minix2_inode * raw_inode; 499 struct minix_inode_info *minix_inode = minix_i(inode); 500 int i; 501 502 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 503 if (!raw_inode) { 504 iget_failed(inode); 505 return ERR_PTR(-EIO); 506 } 507 inode->i_mode = raw_inode->i_mode; 508 i_uid_write(inode, raw_inode->i_uid); 509 i_gid_write(inode, raw_inode->i_gid); 510 set_nlink(inode, raw_inode->i_nlinks); 511 inode->i_size = raw_inode->i_size; 512 inode->i_mtime.tv_sec = raw_inode->i_mtime; 513 inode->i_atime.tv_sec = raw_inode->i_atime; 514 inode->i_ctime.tv_sec = raw_inode->i_ctime; 515 inode->i_mtime.tv_nsec = 0; 516 inode->i_atime.tv_nsec = 0; 517 inode->i_ctime.tv_nsec = 0; 518 inode->i_blocks = 0; 519 for (i = 0; i < 10; i++) 520 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 521 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 522 brelse(bh); 523 unlock_new_inode(inode); 524 return inode; 525 } 526 527 /* 528 * The global function to read an inode. 529 */ 530 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 531 { 532 struct inode *inode; 533 534 inode = iget_locked(sb, ino); 535 if (!inode) 536 return ERR_PTR(-ENOMEM); 537 if (!(inode->i_state & I_NEW)) 538 return inode; 539 540 if (INODE_VERSION(inode) == MINIX_V1) 541 return V1_minix_iget(inode); 542 else 543 return V2_minix_iget(inode); 544 } 545 546 /* 547 * The minix V1 function to synchronize an inode. 548 */ 549 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 550 { 551 struct buffer_head * bh; 552 struct minix_inode * raw_inode; 553 struct minix_inode_info *minix_inode = minix_i(inode); 554 int i; 555 556 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 557 if (!raw_inode) 558 return NULL; 559 raw_inode->i_mode = inode->i_mode; 560 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 561 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 562 raw_inode->i_nlinks = inode->i_nlink; 563 raw_inode->i_size = inode->i_size; 564 raw_inode->i_time = inode->i_mtime.tv_sec; 565 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 566 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 567 else for (i = 0; i < 9; i++) 568 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 569 mark_buffer_dirty(bh); 570 return bh; 571 } 572 573 /* 574 * The minix V2 function to synchronize an inode. 575 */ 576 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 577 { 578 struct buffer_head * bh; 579 struct minix2_inode * raw_inode; 580 struct minix_inode_info *minix_inode = minix_i(inode); 581 int i; 582 583 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 584 if (!raw_inode) 585 return NULL; 586 raw_inode->i_mode = inode->i_mode; 587 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 588 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 589 raw_inode->i_nlinks = inode->i_nlink; 590 raw_inode->i_size = inode->i_size; 591 raw_inode->i_mtime = inode->i_mtime.tv_sec; 592 raw_inode->i_atime = inode->i_atime.tv_sec; 593 raw_inode->i_ctime = inode->i_ctime.tv_sec; 594 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 595 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 596 else for (i = 0; i < 10; i++) 597 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 598 mark_buffer_dirty(bh); 599 return bh; 600 } 601 602 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 603 { 604 int err = 0; 605 struct buffer_head *bh; 606 607 if (INODE_VERSION(inode) == MINIX_V1) 608 bh = V1_minix_update_inode(inode); 609 else 610 bh = V2_minix_update_inode(inode); 611 if (!bh) 612 return -EIO; 613 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 614 sync_dirty_buffer(bh); 615 if (buffer_req(bh) && !buffer_uptodate(bh)) { 616 printk("IO error syncing minix inode [%s:%08lx]\n", 617 inode->i_sb->s_id, inode->i_ino); 618 err = -EIO; 619 } 620 } 621 brelse (bh); 622 return err; 623 } 624 625 int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 626 { 627 struct super_block *sb = dentry->d_sb; 628 generic_fillattr(d_inode(dentry), stat); 629 if (INODE_VERSION(d_inode(dentry)) == MINIX_V1) 630 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 631 else 632 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 633 stat->blksize = sb->s_blocksize; 634 return 0; 635 } 636 637 /* 638 * The function that is called for file truncation. 639 */ 640 void minix_truncate(struct inode * inode) 641 { 642 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 643 return; 644 if (INODE_VERSION(inode) == MINIX_V1) 645 V1_minix_truncate(inode); 646 else 647 V2_minix_truncate(inode); 648 } 649 650 static struct dentry *minix_mount(struct file_system_type *fs_type, 651 int flags, const char *dev_name, void *data) 652 { 653 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); 654 } 655 656 static struct file_system_type minix_fs_type = { 657 .owner = THIS_MODULE, 658 .name = "minix", 659 .mount = minix_mount, 660 .kill_sb = kill_block_super, 661 .fs_flags = FS_REQUIRES_DEV, 662 }; 663 MODULE_ALIAS_FS("minix"); 664 665 static int __init init_minix_fs(void) 666 { 667 int err = init_inodecache(); 668 if (err) 669 goto out1; 670 err = register_filesystem(&minix_fs_type); 671 if (err) 672 goto out; 673 return 0; 674 out: 675 destroy_inodecache(); 676 out1: 677 return err; 678 } 679 680 static void __exit exit_minix_fs(void) 681 { 682 unregister_filesystem(&minix_fs_type); 683 destroy_inodecache(); 684 } 685 686 module_init(init_minix_fs) 687 module_exit(exit_minix_fs) 688 MODULE_LICENSE("GPL"); 689 690