1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/minix/inode.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 * 7 * Copyright (C) 1996 Gertjan van Wingerde 8 * Minix V2 fs support. 9 * 10 * Modified for 680x0 by Andreas Schwab 11 * Updated to filesystem version 3 by Daniel Aragones 12 */ 13 14 #include <linux/module.h> 15 #include "minix.h" 16 #include <linux/buffer_head.h> 17 #include <linux/slab.h> 18 #include <linux/init.h> 19 #include <linux/highuid.h> 20 #include <linux/vfs.h> 21 #include <linux/writeback.h> 22 23 static int minix_write_inode(struct inode *inode, 24 struct writeback_control *wbc); 25 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 26 static int minix_remount (struct super_block * sb, int * flags, char * data); 27 28 static void minix_evict_inode(struct inode *inode) 29 { 30 truncate_inode_pages_final(&inode->i_data); 31 if (!inode->i_nlink) { 32 inode->i_size = 0; 33 minix_truncate(inode); 34 } 35 invalidate_inode_buffers(inode); 36 clear_inode(inode); 37 if (!inode->i_nlink) 38 minix_free_inode(inode); 39 } 40 41 static void minix_put_super(struct super_block *sb) 42 { 43 int i; 44 struct minix_sb_info *sbi = minix_sb(sb); 45 46 if (!sb_rdonly(sb)) { 47 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 48 sbi->s_ms->s_state = sbi->s_mount_state; 49 mark_buffer_dirty(sbi->s_sbh); 50 } 51 for (i = 0; i < sbi->s_imap_blocks; i++) 52 brelse(sbi->s_imap[i]); 53 for (i = 0; i < sbi->s_zmap_blocks; i++) 54 brelse(sbi->s_zmap[i]); 55 brelse (sbi->s_sbh); 56 kfree(sbi->s_imap); 57 sb->s_fs_info = NULL; 58 kfree(sbi); 59 } 60 61 static struct kmem_cache * minix_inode_cachep; 62 63 static struct inode *minix_alloc_inode(struct super_block *sb) 64 { 65 struct minix_inode_info *ei; 66 ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); 67 if (!ei) 68 return NULL; 69 return &ei->vfs_inode; 70 } 71 72 static void minix_free_in_core_inode(struct inode *inode) 73 { 74 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 75 } 76 77 static void init_once(void *foo) 78 { 79 struct minix_inode_info *ei = (struct minix_inode_info *) foo; 80 81 inode_init_once(&ei->vfs_inode); 82 } 83 84 static int __init init_inodecache(void) 85 { 86 minix_inode_cachep = kmem_cache_create("minix_inode_cache", 87 sizeof(struct minix_inode_info), 88 0, (SLAB_RECLAIM_ACCOUNT| 89 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 90 init_once); 91 if (minix_inode_cachep == NULL) 92 return -ENOMEM; 93 return 0; 94 } 95 96 static void destroy_inodecache(void) 97 { 98 /* 99 * Make sure all delayed rcu free inodes are flushed before we 100 * destroy cache. 101 */ 102 rcu_barrier(); 103 kmem_cache_destroy(minix_inode_cachep); 104 } 105 106 static const struct super_operations minix_sops = { 107 .alloc_inode = minix_alloc_inode, 108 .free_inode = minix_free_in_core_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 sync_filesystem(sb); 122 ms = sbi->s_ms; 123 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 124 return 0; 125 if (*flags & SB_RDONLY) { 126 if (ms->s_state & MINIX_VALID_FS || 127 !(sbi->s_mount_state & MINIX_VALID_FS)) 128 return 0; 129 /* Mounting a rw partition read-only. */ 130 if (sbi->s_version != MINIX_V3) 131 ms->s_state = sbi->s_mount_state; 132 mark_buffer_dirty(sbi->s_sbh); 133 } else { 134 /* Mount a partition which is read-only, read-write. */ 135 if (sbi->s_version != MINIX_V3) { 136 sbi->s_mount_state = ms->s_state; 137 ms->s_state &= ~MINIX_VALID_FS; 138 } else { 139 sbi->s_mount_state = MINIX_VALID_FS; 140 } 141 mark_buffer_dirty(sbi->s_sbh); 142 143 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 144 printk("MINIX-fs warning: remounting unchecked fs, " 145 "running fsck is recommended\n"); 146 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 147 printk("MINIX-fs warning: remounting fs with errors, " 148 "running fsck is recommended\n"); 149 } 150 return 0; 151 } 152 153 static int minix_fill_super(struct super_block *s, void *data, int silent) 154 { 155 struct buffer_head *bh; 156 struct buffer_head **map; 157 struct minix_super_block *ms; 158 struct minix3_super_block *m3s = NULL; 159 unsigned long i, block; 160 struct inode *root_inode; 161 struct minix_sb_info *sbi; 162 int ret = -EINVAL; 163 164 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 165 if (!sbi) 166 return -ENOMEM; 167 s->s_fs_info = sbi; 168 169 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 170 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 171 172 if (!sb_set_blocksize(s, BLOCK_SIZE)) 173 goto out_bad_hblock; 174 175 if (!(bh = sb_bread(s, 1))) 176 goto out_bad_sb; 177 178 ms = (struct minix_super_block *) bh->b_data; 179 sbi->s_ms = ms; 180 sbi->s_sbh = bh; 181 sbi->s_mount_state = ms->s_state; 182 sbi->s_ninodes = ms->s_ninodes; 183 sbi->s_nzones = ms->s_nzones; 184 sbi->s_imap_blocks = ms->s_imap_blocks; 185 sbi->s_zmap_blocks = ms->s_zmap_blocks; 186 sbi->s_firstdatazone = ms->s_firstdatazone; 187 sbi->s_log_zone_size = ms->s_log_zone_size; 188 sbi->s_max_size = ms->s_max_size; 189 s->s_magic = ms->s_magic; 190 if (s->s_magic == MINIX_SUPER_MAGIC) { 191 sbi->s_version = MINIX_V1; 192 sbi->s_dirsize = 16; 193 sbi->s_namelen = 14; 194 s->s_max_links = MINIX_LINK_MAX; 195 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 196 sbi->s_version = MINIX_V1; 197 sbi->s_dirsize = 32; 198 sbi->s_namelen = 30; 199 s->s_max_links = MINIX_LINK_MAX; 200 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 201 sbi->s_version = MINIX_V2; 202 sbi->s_nzones = ms->s_zones; 203 sbi->s_dirsize = 16; 204 sbi->s_namelen = 14; 205 s->s_max_links = MINIX2_LINK_MAX; 206 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 207 sbi->s_version = MINIX_V2; 208 sbi->s_nzones = ms->s_zones; 209 sbi->s_dirsize = 32; 210 sbi->s_namelen = 30; 211 s->s_max_links = MINIX2_LINK_MAX; 212 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 213 m3s = (struct minix3_super_block *) bh->b_data; 214 s->s_magic = m3s->s_magic; 215 sbi->s_imap_blocks = m3s->s_imap_blocks; 216 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 217 sbi->s_firstdatazone = m3s->s_firstdatazone; 218 sbi->s_log_zone_size = m3s->s_log_zone_size; 219 sbi->s_max_size = m3s->s_max_size; 220 sbi->s_ninodes = m3s->s_ninodes; 221 sbi->s_nzones = m3s->s_zones; 222 sbi->s_dirsize = 64; 223 sbi->s_namelen = 60; 224 sbi->s_version = MINIX_V3; 225 sbi->s_mount_state = MINIX_VALID_FS; 226 sb_set_blocksize(s, m3s->s_blocksize); 227 s->s_max_links = MINIX2_LINK_MAX; 228 } else 229 goto out_no_fs; 230 231 /* 232 * Allocate the buffer map to keep the superblock small. 233 */ 234 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) 235 goto out_illegal_sb; 236 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 237 map = kzalloc(i, GFP_KERNEL); 238 if (!map) 239 goto out_no_map; 240 sbi->s_imap = &map[0]; 241 sbi->s_zmap = &map[sbi->s_imap_blocks]; 242 243 block=2; 244 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 245 if (!(sbi->s_imap[i]=sb_bread(s, block))) 246 goto out_no_bitmap; 247 block++; 248 } 249 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 250 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 251 goto out_no_bitmap; 252 block++; 253 } 254 255 minix_set_bit(0,sbi->s_imap[0]->b_data); 256 minix_set_bit(0,sbi->s_zmap[0]->b_data); 257 258 /* Apparently minix can create filesystems that allocate more blocks for 259 * the bitmaps than needed. We simply ignore that, but verify it didn't 260 * create one with not enough blocks and bail out if so. 261 */ 262 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 263 if (sbi->s_imap_blocks < block) { 264 printk("MINIX-fs: file system does not have enough " 265 "imap blocks allocated. Refusing to mount.\n"); 266 goto out_no_bitmap; 267 } 268 269 block = minix_blocks_needed( 270 (sbi->s_nzones - sbi->s_firstdatazone + 1), 271 s->s_blocksize); 272 if (sbi->s_zmap_blocks < block) { 273 printk("MINIX-fs: file system does not have enough " 274 "zmap blocks allocated. Refusing to mount.\n"); 275 goto out_no_bitmap; 276 } 277 278 /* set up enough so that it can read an inode */ 279 s->s_op = &minix_sops; 280 root_inode = minix_iget(s, MINIX_ROOT_INO); 281 if (IS_ERR(root_inode)) { 282 ret = PTR_ERR(root_inode); 283 goto out_no_root; 284 } 285 286 ret = -ENOMEM; 287 s->s_root = d_make_root(root_inode); 288 if (!s->s_root) 289 goto out_no_root; 290 291 if (!sb_rdonly(s)) { 292 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 293 ms->s_state &= ~MINIX_VALID_FS; 294 mark_buffer_dirty(bh); 295 } 296 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 297 printk("MINIX-fs: mounting unchecked file system, " 298 "running fsck is recommended\n"); 299 else if (sbi->s_mount_state & MINIX_ERROR_FS) 300 printk("MINIX-fs: mounting file system with errors, " 301 "running fsck is recommended\n"); 302 303 return 0; 304 305 out_no_root: 306 if (!silent) 307 printk("MINIX-fs: get root inode failed\n"); 308 goto out_freemap; 309 310 out_no_bitmap: 311 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 312 out_freemap: 313 for (i = 0; i < sbi->s_imap_blocks; i++) 314 brelse(sbi->s_imap[i]); 315 for (i = 0; i < sbi->s_zmap_blocks; i++) 316 brelse(sbi->s_zmap[i]); 317 kfree(sbi->s_imap); 318 goto out_release; 319 320 out_no_map: 321 ret = -ENOMEM; 322 if (!silent) 323 printk("MINIX-fs: can't allocate map\n"); 324 goto out_release; 325 326 out_illegal_sb: 327 if (!silent) 328 printk("MINIX-fs: bad superblock\n"); 329 goto out_release; 330 331 out_no_fs: 332 if (!silent) 333 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 334 "on device %s.\n", s->s_id); 335 out_release: 336 brelse(bh); 337 goto out; 338 339 out_bad_hblock: 340 printk("MINIX-fs: blocksize too small for device\n"); 341 goto out; 342 343 out_bad_sb: 344 printk("MINIX-fs: unable to read superblock\n"); 345 out: 346 s->s_fs_info = NULL; 347 kfree(sbi); 348 return ret; 349 } 350 351 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 352 { 353 struct super_block *sb = dentry->d_sb; 354 struct minix_sb_info *sbi = minix_sb(sb); 355 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 356 buf->f_type = sb->s_magic; 357 buf->f_bsize = sb->s_blocksize; 358 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 359 buf->f_bfree = minix_count_free_blocks(sb); 360 buf->f_bavail = buf->f_bfree; 361 buf->f_files = sbi->s_ninodes; 362 buf->f_ffree = minix_count_free_inodes(sb); 363 buf->f_namelen = sbi->s_namelen; 364 buf->f_fsid.val[0] = (u32)id; 365 buf->f_fsid.val[1] = (u32)(id >> 32); 366 367 return 0; 368 } 369 370 static int minix_get_block(struct inode *inode, sector_t block, 371 struct buffer_head *bh_result, int create) 372 { 373 if (INODE_VERSION(inode) == MINIX_V1) 374 return V1_minix_get_block(inode, block, bh_result, create); 375 else 376 return V2_minix_get_block(inode, block, bh_result, create); 377 } 378 379 static int minix_writepage(struct page *page, struct writeback_control *wbc) 380 { 381 return block_write_full_page(page, minix_get_block, wbc); 382 } 383 384 static int minix_readpage(struct file *file, struct page *page) 385 { 386 return block_read_full_page(page,minix_get_block); 387 } 388 389 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 390 { 391 return __block_write_begin(page, pos, len, minix_get_block); 392 } 393 394 static void minix_write_failed(struct address_space *mapping, loff_t to) 395 { 396 struct inode *inode = mapping->host; 397 398 if (to > inode->i_size) { 399 truncate_pagecache(inode, inode->i_size); 400 minix_truncate(inode); 401 } 402 } 403 404 static int minix_write_begin(struct file *file, struct address_space *mapping, 405 loff_t pos, unsigned len, unsigned flags, 406 struct page **pagep, void **fsdata) 407 { 408 int ret; 409 410 ret = block_write_begin(mapping, pos, len, flags, pagep, 411 minix_get_block); 412 if (unlikely(ret)) 413 minix_write_failed(mapping, pos + len); 414 415 return ret; 416 } 417 418 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 419 { 420 return generic_block_bmap(mapping,block,minix_get_block); 421 } 422 423 static const struct address_space_operations minix_aops = { 424 .readpage = minix_readpage, 425 .writepage = minix_writepage, 426 .write_begin = minix_write_begin, 427 .write_end = generic_write_end, 428 .bmap = minix_bmap 429 }; 430 431 static const struct inode_operations minix_symlink_inode_operations = { 432 .get_link = page_get_link, 433 .getattr = minix_getattr, 434 }; 435 436 void minix_set_inode(struct inode *inode, dev_t rdev) 437 { 438 if (S_ISREG(inode->i_mode)) { 439 inode->i_op = &minix_file_inode_operations; 440 inode->i_fop = &minix_file_operations; 441 inode->i_mapping->a_ops = &minix_aops; 442 } else if (S_ISDIR(inode->i_mode)) { 443 inode->i_op = &minix_dir_inode_operations; 444 inode->i_fop = &minix_dir_operations; 445 inode->i_mapping->a_ops = &minix_aops; 446 } else if (S_ISLNK(inode->i_mode)) { 447 inode->i_op = &minix_symlink_inode_operations; 448 inode_nohighmem(inode); 449 inode->i_mapping->a_ops = &minix_aops; 450 } else 451 init_special_inode(inode, inode->i_mode, rdev); 452 } 453 454 /* 455 * The minix V1 function to read an inode. 456 */ 457 static struct inode *V1_minix_iget(struct inode *inode) 458 { 459 struct buffer_head * bh; 460 struct minix_inode * raw_inode; 461 struct minix_inode_info *minix_inode = minix_i(inode); 462 int i; 463 464 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 465 if (!raw_inode) { 466 iget_failed(inode); 467 return ERR_PTR(-EIO); 468 } 469 inode->i_mode = raw_inode->i_mode; 470 i_uid_write(inode, raw_inode->i_uid); 471 i_gid_write(inode, raw_inode->i_gid); 472 set_nlink(inode, raw_inode->i_nlinks); 473 inode->i_size = raw_inode->i_size; 474 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; 475 inode->i_mtime.tv_nsec = 0; 476 inode->i_atime.tv_nsec = 0; 477 inode->i_ctime.tv_nsec = 0; 478 inode->i_blocks = 0; 479 for (i = 0; i < 9; i++) 480 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 481 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 482 brelse(bh); 483 unlock_new_inode(inode); 484 return inode; 485 } 486 487 /* 488 * The minix V2 function to read an inode. 489 */ 490 static struct inode *V2_minix_iget(struct inode *inode) 491 { 492 struct buffer_head * bh; 493 struct minix2_inode * raw_inode; 494 struct minix_inode_info *minix_inode = minix_i(inode); 495 int i; 496 497 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 498 if (!raw_inode) { 499 iget_failed(inode); 500 return ERR_PTR(-EIO); 501 } 502 inode->i_mode = raw_inode->i_mode; 503 i_uid_write(inode, raw_inode->i_uid); 504 i_gid_write(inode, raw_inode->i_gid); 505 set_nlink(inode, raw_inode->i_nlinks); 506 inode->i_size = raw_inode->i_size; 507 inode->i_mtime.tv_sec = raw_inode->i_mtime; 508 inode->i_atime.tv_sec = raw_inode->i_atime; 509 inode->i_ctime.tv_sec = raw_inode->i_ctime; 510 inode->i_mtime.tv_nsec = 0; 511 inode->i_atime.tv_nsec = 0; 512 inode->i_ctime.tv_nsec = 0; 513 inode->i_blocks = 0; 514 for (i = 0; i < 10; i++) 515 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 516 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 517 brelse(bh); 518 unlock_new_inode(inode); 519 return inode; 520 } 521 522 /* 523 * The global function to read an inode. 524 */ 525 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 526 { 527 struct inode *inode; 528 529 inode = iget_locked(sb, ino); 530 if (!inode) 531 return ERR_PTR(-ENOMEM); 532 if (!(inode->i_state & I_NEW)) 533 return inode; 534 535 if (INODE_VERSION(inode) == MINIX_V1) 536 return V1_minix_iget(inode); 537 else 538 return V2_minix_iget(inode); 539 } 540 541 /* 542 * The minix V1 function to synchronize an inode. 543 */ 544 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 545 { 546 struct buffer_head * bh; 547 struct minix_inode * raw_inode; 548 struct minix_inode_info *minix_inode = minix_i(inode); 549 int i; 550 551 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 552 if (!raw_inode) 553 return NULL; 554 raw_inode->i_mode = inode->i_mode; 555 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 556 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 557 raw_inode->i_nlinks = inode->i_nlink; 558 raw_inode->i_size = inode->i_size; 559 raw_inode->i_time = inode->i_mtime.tv_sec; 560 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 561 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 562 else for (i = 0; i < 9; i++) 563 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 564 mark_buffer_dirty(bh); 565 return bh; 566 } 567 568 /* 569 * The minix V2 function to synchronize an inode. 570 */ 571 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 572 { 573 struct buffer_head * bh; 574 struct minix2_inode * raw_inode; 575 struct minix_inode_info *minix_inode = minix_i(inode); 576 int i; 577 578 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 579 if (!raw_inode) 580 return NULL; 581 raw_inode->i_mode = inode->i_mode; 582 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 583 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 584 raw_inode->i_nlinks = inode->i_nlink; 585 raw_inode->i_size = inode->i_size; 586 raw_inode->i_mtime = inode->i_mtime.tv_sec; 587 raw_inode->i_atime = inode->i_atime.tv_sec; 588 raw_inode->i_ctime = inode->i_ctime.tv_sec; 589 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 590 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 591 else for (i = 0; i < 10; i++) 592 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 593 mark_buffer_dirty(bh); 594 return bh; 595 } 596 597 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 598 { 599 int err = 0; 600 struct buffer_head *bh; 601 602 if (INODE_VERSION(inode) == MINIX_V1) 603 bh = V1_minix_update_inode(inode); 604 else 605 bh = V2_minix_update_inode(inode); 606 if (!bh) 607 return -EIO; 608 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 609 sync_dirty_buffer(bh); 610 if (buffer_req(bh) && !buffer_uptodate(bh)) { 611 printk("IO error syncing minix inode [%s:%08lx]\n", 612 inode->i_sb->s_id, inode->i_ino); 613 err = -EIO; 614 } 615 } 616 brelse (bh); 617 return err; 618 } 619 620 int minix_getattr(const struct path *path, struct kstat *stat, 621 u32 request_mask, unsigned int flags) 622 { 623 struct super_block *sb = path->dentry->d_sb; 624 struct inode *inode = d_inode(path->dentry); 625 626 generic_fillattr(inode, stat); 627 if (INODE_VERSION(inode) == MINIX_V1) 628 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 629 else 630 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 631 stat->blksize = sb->s_blocksize; 632 return 0; 633 } 634 635 /* 636 * The function that is called for file truncation. 637 */ 638 void minix_truncate(struct inode * inode) 639 { 640 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 641 return; 642 if (INODE_VERSION(inode) == MINIX_V1) 643 V1_minix_truncate(inode); 644 else 645 V2_minix_truncate(inode); 646 } 647 648 static struct dentry *minix_mount(struct file_system_type *fs_type, 649 int flags, const char *dev_name, void *data) 650 { 651 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); 652 } 653 654 static struct file_system_type minix_fs_type = { 655 .owner = THIS_MODULE, 656 .name = "minix", 657 .mount = minix_mount, 658 .kill_sb = kill_block_super, 659 .fs_flags = FS_REQUIRES_DEV, 660 }; 661 MODULE_ALIAS_FS("minix"); 662 663 static int __init init_minix_fs(void) 664 { 665 int err = init_inodecache(); 666 if (err) 667 goto out1; 668 err = register_filesystem(&minix_fs_type); 669 if (err) 670 goto out; 671 return 0; 672 out: 673 destroy_inodecache(); 674 out1: 675 return err; 676 } 677 678 static void __exit exit_minix_fs(void) 679 { 680 unregister_filesystem(&minix_fs_type); 681 destroy_inodecache(); 682 } 683 684 module_init(init_minix_fs) 685 module_exit(exit_minix_fs) 686 MODULE_LICENSE("GPL"); 687 688