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 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 = (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 /* 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 ms = sbi->s_ms; 127 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 128 return 0; 129 if (*flags & MS_RDONLY) { 130 if (ms->s_state & MINIX_VALID_FS || 131 !(sbi->s_mount_state & MINIX_VALID_FS)) 132 return 0; 133 /* Mounting a rw partition read-only. */ 134 if (sbi->s_version != MINIX_V3) 135 ms->s_state = sbi->s_mount_state; 136 mark_buffer_dirty(sbi->s_sbh); 137 } else { 138 /* Mount a partition which is read-only, read-write. */ 139 if (sbi->s_version != MINIX_V3) { 140 sbi->s_mount_state = ms->s_state; 141 ms->s_state &= ~MINIX_VALID_FS; 142 } else { 143 sbi->s_mount_state = MINIX_VALID_FS; 144 } 145 mark_buffer_dirty(sbi->s_sbh); 146 147 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 148 printk("MINIX-fs warning: remounting unchecked fs, " 149 "running fsck is recommended\n"); 150 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 151 printk("MINIX-fs warning: remounting fs with errors, " 152 "running fsck is recommended\n"); 153 } 154 return 0; 155 } 156 157 static int minix_fill_super(struct super_block *s, void *data, int silent) 158 { 159 struct buffer_head *bh; 160 struct buffer_head **map; 161 struct minix_super_block *ms; 162 struct minix3_super_block *m3s = NULL; 163 unsigned long i, block; 164 struct inode *root_inode; 165 struct minix_sb_info *sbi; 166 int ret = -EINVAL; 167 168 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 169 if (!sbi) 170 return -ENOMEM; 171 s->s_fs_info = sbi; 172 173 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 174 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 175 176 if (!sb_set_blocksize(s, BLOCK_SIZE)) 177 goto out_bad_hblock; 178 179 if (!(bh = sb_bread(s, 1))) 180 goto out_bad_sb; 181 182 ms = (struct minix_super_block *) bh->b_data; 183 sbi->s_ms = ms; 184 sbi->s_sbh = bh; 185 sbi->s_mount_state = ms->s_state; 186 sbi->s_ninodes = ms->s_ninodes; 187 sbi->s_nzones = ms->s_nzones; 188 sbi->s_imap_blocks = ms->s_imap_blocks; 189 sbi->s_zmap_blocks = ms->s_zmap_blocks; 190 sbi->s_firstdatazone = ms->s_firstdatazone; 191 sbi->s_log_zone_size = ms->s_log_zone_size; 192 sbi->s_max_size = ms->s_max_size; 193 s->s_magic = ms->s_magic; 194 if (s->s_magic == MINIX_SUPER_MAGIC) { 195 sbi->s_version = MINIX_V1; 196 sbi->s_dirsize = 16; 197 sbi->s_namelen = 14; 198 s->s_max_links = MINIX_LINK_MAX; 199 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 200 sbi->s_version = MINIX_V1; 201 sbi->s_dirsize = 32; 202 sbi->s_namelen = 30; 203 s->s_max_links = MINIX_LINK_MAX; 204 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 205 sbi->s_version = MINIX_V2; 206 sbi->s_nzones = ms->s_zones; 207 sbi->s_dirsize = 16; 208 sbi->s_namelen = 14; 209 s->s_max_links = MINIX2_LINK_MAX; 210 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 211 sbi->s_version = MINIX_V2; 212 sbi->s_nzones = ms->s_zones; 213 sbi->s_dirsize = 32; 214 sbi->s_namelen = 30; 215 s->s_max_links = MINIX2_LINK_MAX; 216 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 217 m3s = (struct minix3_super_block *) bh->b_data; 218 s->s_magic = m3s->s_magic; 219 sbi->s_imap_blocks = m3s->s_imap_blocks; 220 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 221 sbi->s_firstdatazone = m3s->s_firstdatazone; 222 sbi->s_log_zone_size = m3s->s_log_zone_size; 223 sbi->s_max_size = m3s->s_max_size; 224 sbi->s_ninodes = m3s->s_ninodes; 225 sbi->s_nzones = m3s->s_zones; 226 sbi->s_dirsize = 64; 227 sbi->s_namelen = 60; 228 sbi->s_version = MINIX_V3; 229 sbi->s_mount_state = MINIX_VALID_FS; 230 sb_set_blocksize(s, m3s->s_blocksize); 231 s->s_max_links = MINIX2_LINK_MAX; 232 } else 233 goto out_no_fs; 234 235 /* 236 * Allocate the buffer map to keep the superblock small. 237 */ 238 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) 239 goto out_illegal_sb; 240 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 241 map = kzalloc(i, GFP_KERNEL); 242 if (!map) 243 goto out_no_map; 244 sbi->s_imap = &map[0]; 245 sbi->s_zmap = &map[sbi->s_imap_blocks]; 246 247 block=2; 248 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 249 if (!(sbi->s_imap[i]=sb_bread(s, block))) 250 goto out_no_bitmap; 251 block++; 252 } 253 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 254 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 255 goto out_no_bitmap; 256 block++; 257 } 258 259 minix_set_bit(0,sbi->s_imap[0]->b_data); 260 minix_set_bit(0,sbi->s_zmap[0]->b_data); 261 262 /* Apparently minix can create filesystems that allocate more blocks for 263 * the bitmaps than needed. We simply ignore that, but verify it didn't 264 * create one with not enough blocks and bail out if so. 265 */ 266 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 267 if (sbi->s_imap_blocks < block) { 268 printk("MINIX-fs: file system does not have enough " 269 "imap blocks allocated. Refusing to mount\n"); 270 goto out_no_bitmap; 271 } 272 273 block = minix_blocks_needed( 274 (sbi->s_nzones - (sbi->s_firstdatazone + 1)), 275 s->s_blocksize); 276 if (sbi->s_zmap_blocks < block) { 277 printk("MINIX-fs: file system does not have enough " 278 "zmap blocks allocated. Refusing to mount.\n"); 279 goto out_no_bitmap; 280 } 281 282 /* set up enough so that it can read an inode */ 283 s->s_op = &minix_sops; 284 root_inode = minix_iget(s, MINIX_ROOT_INO); 285 if (IS_ERR(root_inode)) { 286 ret = PTR_ERR(root_inode); 287 goto out_no_root; 288 } 289 290 ret = -ENOMEM; 291 s->s_root = d_make_root(root_inode); 292 if (!s->s_root) 293 goto out_no_root; 294 295 if (!(s->s_flags & MS_RDONLY)) { 296 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 297 ms->s_state &= ~MINIX_VALID_FS; 298 mark_buffer_dirty(bh); 299 } 300 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 301 printk("MINIX-fs: mounting unchecked file system, " 302 "running fsck is recommended\n"); 303 else if (sbi->s_mount_state & MINIX_ERROR_FS) 304 printk("MINIX-fs: mounting file system with errors, " 305 "running fsck is recommended\n"); 306 307 return 0; 308 309 out_no_root: 310 if (!silent) 311 printk("MINIX-fs: get root inode failed\n"); 312 goto out_freemap; 313 314 out_no_bitmap: 315 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 316 out_freemap: 317 for (i = 0; i < sbi->s_imap_blocks; i++) 318 brelse(sbi->s_imap[i]); 319 for (i = 0; i < sbi->s_zmap_blocks; i++) 320 brelse(sbi->s_zmap[i]); 321 kfree(sbi->s_imap); 322 goto out_release; 323 324 out_no_map: 325 ret = -ENOMEM; 326 if (!silent) 327 printk("MINIX-fs: can't allocate map\n"); 328 goto out_release; 329 330 out_illegal_sb: 331 if (!silent) 332 printk("MINIX-fs: bad superblock\n"); 333 goto out_release; 334 335 out_no_fs: 336 if (!silent) 337 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 338 "on device %s.\n", s->s_id); 339 out_release: 340 brelse(bh); 341 goto out; 342 343 out_bad_hblock: 344 printk("MINIX-fs: blocksize too small for device\n"); 345 goto out; 346 347 out_bad_sb: 348 printk("MINIX-fs: unable to read superblock\n"); 349 out: 350 s->s_fs_info = NULL; 351 kfree(sbi); 352 return ret; 353 } 354 355 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 356 { 357 struct super_block *sb = dentry->d_sb; 358 struct minix_sb_info *sbi = minix_sb(sb); 359 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 360 buf->f_type = sb->s_magic; 361 buf->f_bsize = sb->s_blocksize; 362 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 363 buf->f_bfree = minix_count_free_blocks(sb); 364 buf->f_bavail = buf->f_bfree; 365 buf->f_files = sbi->s_ninodes; 366 buf->f_ffree = minix_count_free_inodes(sb); 367 buf->f_namelen = sbi->s_namelen; 368 buf->f_fsid.val[0] = (u32)id; 369 buf->f_fsid.val[1] = (u32)(id >> 32); 370 371 return 0; 372 } 373 374 static int minix_get_block(struct inode *inode, sector_t block, 375 struct buffer_head *bh_result, int create) 376 { 377 if (INODE_VERSION(inode) == MINIX_V1) 378 return V1_minix_get_block(inode, block, bh_result, create); 379 else 380 return V2_minix_get_block(inode, block, bh_result, create); 381 } 382 383 static int minix_writepage(struct page *page, struct writeback_control *wbc) 384 { 385 return block_write_full_page(page, minix_get_block, wbc); 386 } 387 388 static int minix_readpage(struct file *file, struct page *page) 389 { 390 return block_read_full_page(page,minix_get_block); 391 } 392 393 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 394 { 395 return __block_write_begin(page, pos, len, minix_get_block); 396 } 397 398 static void minix_write_failed(struct address_space *mapping, loff_t to) 399 { 400 struct inode *inode = mapping->host; 401 402 if (to > inode->i_size) { 403 truncate_pagecache(inode, to, inode->i_size); 404 minix_truncate(inode); 405 } 406 } 407 408 static int minix_write_begin(struct file *file, struct address_space *mapping, 409 loff_t pos, unsigned len, unsigned flags, 410 struct page **pagep, void **fsdata) 411 { 412 int ret; 413 414 ret = block_write_begin(mapping, pos, len, flags, pagep, 415 minix_get_block); 416 if (unlikely(ret)) 417 minix_write_failed(mapping, pos + len); 418 419 return ret; 420 } 421 422 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 423 { 424 return generic_block_bmap(mapping,block,minix_get_block); 425 } 426 427 static const struct address_space_operations minix_aops = { 428 .readpage = minix_readpage, 429 .writepage = minix_writepage, 430 .write_begin = minix_write_begin, 431 .write_end = generic_write_end, 432 .bmap = minix_bmap 433 }; 434 435 static const struct inode_operations minix_symlink_inode_operations = { 436 .readlink = generic_readlink, 437 .follow_link = page_follow_link_light, 438 .put_link = page_put_link, 439 .getattr = minix_getattr, 440 }; 441 442 void minix_set_inode(struct inode *inode, dev_t rdev) 443 { 444 if (S_ISREG(inode->i_mode)) { 445 inode->i_op = &minix_file_inode_operations; 446 inode->i_fop = &minix_file_operations; 447 inode->i_mapping->a_ops = &minix_aops; 448 } else if (S_ISDIR(inode->i_mode)) { 449 inode->i_op = &minix_dir_inode_operations; 450 inode->i_fop = &minix_dir_operations; 451 inode->i_mapping->a_ops = &minix_aops; 452 } else if (S_ISLNK(inode->i_mode)) { 453 inode->i_op = &minix_symlink_inode_operations; 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(dentry->d_inode, stat); 629 if (INODE_VERSION(dentry->d_inode) == 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