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/mpage.h> 21 #include <linux/vfs.h> 22 #include <linux/writeback.h> 23 24 static int minix_write_inode(struct inode *inode, 25 struct writeback_control *wbc); 26 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 27 static int minix_remount (struct super_block * sb, int * flags, char * data); 28 29 static void minix_evict_inode(struct inode *inode) 30 { 31 truncate_inode_pages_final(&inode->i_data); 32 if (!inode->i_nlink) { 33 inode->i_size = 0; 34 minix_truncate(inode); 35 } 36 invalidate_inode_buffers(inode); 37 clear_inode(inode); 38 if (!inode->i_nlink) 39 minix_free_inode(inode); 40 } 41 42 static void minix_put_super(struct super_block *sb) 43 { 44 int i; 45 struct minix_sb_info *sbi = minix_sb(sb); 46 47 if (!sb_rdonly(sb)) { 48 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 49 sbi->s_ms->s_state = sbi->s_mount_state; 50 mark_buffer_dirty(sbi->s_sbh); 51 } 52 for (i = 0; i < sbi->s_imap_blocks; i++) 53 brelse(sbi->s_imap[i]); 54 for (i = 0; i < sbi->s_zmap_blocks; i++) 55 brelse(sbi->s_zmap[i]); 56 brelse (sbi->s_sbh); 57 kfree(sbi->s_imap); 58 sb->s_fs_info = NULL; 59 kfree(sbi); 60 } 61 62 static struct kmem_cache * minix_inode_cachep; 63 64 static struct inode *minix_alloc_inode(struct super_block *sb) 65 { 66 struct minix_inode_info *ei; 67 ei = alloc_inode_sb(sb, minix_inode_cachep, GFP_KERNEL); 68 if (!ei) 69 return NULL; 70 return &ei->vfs_inode; 71 } 72 73 static void minix_free_in_core_inode(struct inode *inode) 74 { 75 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 76 } 77 78 static void init_once(void *foo) 79 { 80 struct minix_inode_info *ei = (struct minix_inode_info *) foo; 81 82 inode_init_once(&ei->vfs_inode); 83 } 84 85 static int __init init_inodecache(void) 86 { 87 minix_inode_cachep = kmem_cache_create("minix_inode_cache", 88 sizeof(struct minix_inode_info), 89 0, (SLAB_RECLAIM_ACCOUNT| 90 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 91 init_once); 92 if (minix_inode_cachep == NULL) 93 return -ENOMEM; 94 return 0; 95 } 96 97 static void destroy_inodecache(void) 98 { 99 /* 100 * Make sure all delayed rcu free inodes are flushed before we 101 * destroy cache. 102 */ 103 rcu_barrier(); 104 kmem_cache_destroy(minix_inode_cachep); 105 } 106 107 static const struct super_operations minix_sops = { 108 .alloc_inode = minix_alloc_inode, 109 .free_inode = minix_free_in_core_inode, 110 .write_inode = minix_write_inode, 111 .evict_inode = minix_evict_inode, 112 .put_super = minix_put_super, 113 .statfs = minix_statfs, 114 .remount_fs = minix_remount, 115 }; 116 117 static int minix_remount (struct super_block * sb, int * flags, char * data) 118 { 119 struct minix_sb_info * sbi = minix_sb(sb); 120 struct minix_super_block * ms; 121 122 sync_filesystem(sb); 123 ms = sbi->s_ms; 124 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 125 return 0; 126 if (*flags & SB_RDONLY) { 127 if (ms->s_state & MINIX_VALID_FS || 128 !(sbi->s_mount_state & MINIX_VALID_FS)) 129 return 0; 130 /* Mounting a rw partition read-only. */ 131 if (sbi->s_version != MINIX_V3) 132 ms->s_state = sbi->s_mount_state; 133 mark_buffer_dirty(sbi->s_sbh); 134 } else { 135 /* Mount a partition which is read-only, read-write. */ 136 if (sbi->s_version != MINIX_V3) { 137 sbi->s_mount_state = ms->s_state; 138 ms->s_state &= ~MINIX_VALID_FS; 139 } else { 140 sbi->s_mount_state = MINIX_VALID_FS; 141 } 142 mark_buffer_dirty(sbi->s_sbh); 143 144 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 145 printk("MINIX-fs warning: remounting unchecked fs, " 146 "running fsck is recommended\n"); 147 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 148 printk("MINIX-fs warning: remounting fs with errors, " 149 "running fsck is recommended\n"); 150 } 151 return 0; 152 } 153 154 static bool minix_check_superblock(struct super_block *sb) 155 { 156 struct minix_sb_info *sbi = minix_sb(sb); 157 158 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) 159 return false; 160 161 /* 162 * s_max_size must not exceed the block mapping limitation. This check 163 * is only needed for V1 filesystems, since V2/V3 support an extra level 164 * of indirect blocks which places the limit well above U32_MAX. 165 */ 166 if (sbi->s_version == MINIX_V1 && 167 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) 168 return false; 169 170 return true; 171 } 172 173 static int minix_fill_super(struct super_block *s, void *data, int silent) 174 { 175 struct buffer_head *bh; 176 struct buffer_head **map; 177 struct minix_super_block *ms; 178 struct minix3_super_block *m3s = NULL; 179 unsigned long i, block; 180 struct inode *root_inode; 181 struct minix_sb_info *sbi; 182 int ret = -EINVAL; 183 184 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 185 if (!sbi) 186 return -ENOMEM; 187 s->s_fs_info = sbi; 188 189 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 190 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 191 192 if (!sb_set_blocksize(s, BLOCK_SIZE)) 193 goto out_bad_hblock; 194 195 if (!(bh = sb_bread(s, 1))) 196 goto out_bad_sb; 197 198 ms = (struct minix_super_block *) bh->b_data; 199 sbi->s_ms = ms; 200 sbi->s_sbh = bh; 201 sbi->s_mount_state = ms->s_state; 202 sbi->s_ninodes = ms->s_ninodes; 203 sbi->s_nzones = ms->s_nzones; 204 sbi->s_imap_blocks = ms->s_imap_blocks; 205 sbi->s_zmap_blocks = ms->s_zmap_blocks; 206 sbi->s_firstdatazone = ms->s_firstdatazone; 207 sbi->s_log_zone_size = ms->s_log_zone_size; 208 s->s_maxbytes = ms->s_max_size; 209 s->s_magic = ms->s_magic; 210 if (s->s_magic == MINIX_SUPER_MAGIC) { 211 sbi->s_version = MINIX_V1; 212 sbi->s_dirsize = 16; 213 sbi->s_namelen = 14; 214 s->s_max_links = MINIX_LINK_MAX; 215 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 216 sbi->s_version = MINIX_V1; 217 sbi->s_dirsize = 32; 218 sbi->s_namelen = 30; 219 s->s_max_links = MINIX_LINK_MAX; 220 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 221 sbi->s_version = MINIX_V2; 222 sbi->s_nzones = ms->s_zones; 223 sbi->s_dirsize = 16; 224 sbi->s_namelen = 14; 225 s->s_max_links = MINIX2_LINK_MAX; 226 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 227 sbi->s_version = MINIX_V2; 228 sbi->s_nzones = ms->s_zones; 229 sbi->s_dirsize = 32; 230 sbi->s_namelen = 30; 231 s->s_max_links = MINIX2_LINK_MAX; 232 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 233 m3s = (struct minix3_super_block *) bh->b_data; 234 s->s_magic = m3s->s_magic; 235 sbi->s_imap_blocks = m3s->s_imap_blocks; 236 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 237 sbi->s_firstdatazone = m3s->s_firstdatazone; 238 sbi->s_log_zone_size = m3s->s_log_zone_size; 239 s->s_maxbytes = m3s->s_max_size; 240 sbi->s_ninodes = m3s->s_ninodes; 241 sbi->s_nzones = m3s->s_zones; 242 sbi->s_dirsize = 64; 243 sbi->s_namelen = 60; 244 sbi->s_version = MINIX_V3; 245 sbi->s_mount_state = MINIX_VALID_FS; 246 sb_set_blocksize(s, m3s->s_blocksize); 247 s->s_max_links = MINIX2_LINK_MAX; 248 } else 249 goto out_no_fs; 250 251 if (!minix_check_superblock(s)) 252 goto out_illegal_sb; 253 254 /* 255 * Allocate the buffer map to keep the superblock small. 256 */ 257 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 258 map = kzalloc(i, GFP_KERNEL); 259 if (!map) 260 goto out_no_map; 261 sbi->s_imap = &map[0]; 262 sbi->s_zmap = &map[sbi->s_imap_blocks]; 263 264 block=2; 265 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 266 if (!(sbi->s_imap[i]=sb_bread(s, block))) 267 goto out_no_bitmap; 268 block++; 269 } 270 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 271 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 272 goto out_no_bitmap; 273 block++; 274 } 275 276 minix_set_bit(0,sbi->s_imap[0]->b_data); 277 minix_set_bit(0,sbi->s_zmap[0]->b_data); 278 279 /* Apparently minix can create filesystems that allocate more blocks for 280 * the bitmaps than needed. We simply ignore that, but verify it didn't 281 * create one with not enough blocks and bail out if so. 282 */ 283 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 284 if (sbi->s_imap_blocks < block) { 285 printk("MINIX-fs: file system does not have enough " 286 "imap blocks allocated. Refusing to mount.\n"); 287 goto out_no_bitmap; 288 } 289 290 block = minix_blocks_needed( 291 (sbi->s_nzones - sbi->s_firstdatazone + 1), 292 s->s_blocksize); 293 if (sbi->s_zmap_blocks < block) { 294 printk("MINIX-fs: file system does not have enough " 295 "zmap blocks allocated. Refusing to mount.\n"); 296 goto out_no_bitmap; 297 } 298 299 /* set up enough so that it can read an inode */ 300 s->s_op = &minix_sops; 301 s->s_time_min = 0; 302 s->s_time_max = U32_MAX; 303 root_inode = minix_iget(s, MINIX_ROOT_INO); 304 if (IS_ERR(root_inode)) { 305 ret = PTR_ERR(root_inode); 306 goto out_no_root; 307 } 308 309 ret = -ENOMEM; 310 s->s_root = d_make_root(root_inode); 311 if (!s->s_root) 312 goto out_no_root; 313 314 if (!sb_rdonly(s)) { 315 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 316 ms->s_state &= ~MINIX_VALID_FS; 317 mark_buffer_dirty(bh); 318 } 319 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 320 printk("MINIX-fs: mounting unchecked file system, " 321 "running fsck is recommended\n"); 322 else if (sbi->s_mount_state & MINIX_ERROR_FS) 323 printk("MINIX-fs: mounting file system with errors, " 324 "running fsck is recommended\n"); 325 326 return 0; 327 328 out_no_root: 329 if (!silent) 330 printk("MINIX-fs: get root inode failed\n"); 331 goto out_freemap; 332 333 out_no_bitmap: 334 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 335 out_freemap: 336 for (i = 0; i < sbi->s_imap_blocks; i++) 337 brelse(sbi->s_imap[i]); 338 for (i = 0; i < sbi->s_zmap_blocks; i++) 339 brelse(sbi->s_zmap[i]); 340 kfree(sbi->s_imap); 341 goto out_release; 342 343 out_no_map: 344 ret = -ENOMEM; 345 if (!silent) 346 printk("MINIX-fs: can't allocate map\n"); 347 goto out_release; 348 349 out_illegal_sb: 350 if (!silent) 351 printk("MINIX-fs: bad superblock\n"); 352 goto out_release; 353 354 out_no_fs: 355 if (!silent) 356 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 357 "on device %s.\n", s->s_id); 358 out_release: 359 brelse(bh); 360 goto out; 361 362 out_bad_hblock: 363 printk("MINIX-fs: blocksize too small for device\n"); 364 goto out; 365 366 out_bad_sb: 367 printk("MINIX-fs: unable to read superblock\n"); 368 out: 369 s->s_fs_info = NULL; 370 kfree(sbi); 371 return ret; 372 } 373 374 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 375 { 376 struct super_block *sb = dentry->d_sb; 377 struct minix_sb_info *sbi = minix_sb(sb); 378 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 379 buf->f_type = sb->s_magic; 380 buf->f_bsize = sb->s_blocksize; 381 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 382 buf->f_bfree = minix_count_free_blocks(sb); 383 buf->f_bavail = buf->f_bfree; 384 buf->f_files = sbi->s_ninodes; 385 buf->f_ffree = minix_count_free_inodes(sb); 386 buf->f_namelen = sbi->s_namelen; 387 buf->f_fsid = u64_to_fsid(id); 388 389 return 0; 390 } 391 392 static int minix_get_block(struct inode *inode, sector_t block, 393 struct buffer_head *bh_result, int create) 394 { 395 if (INODE_VERSION(inode) == MINIX_V1) 396 return V1_minix_get_block(inode, block, bh_result, create); 397 else 398 return V2_minix_get_block(inode, block, bh_result, create); 399 } 400 401 static int minix_writepages(struct address_space *mapping, 402 struct writeback_control *wbc) 403 { 404 return mpage_writepages(mapping, wbc, minix_get_block); 405 } 406 407 static int minix_read_folio(struct file *file, struct folio *folio) 408 { 409 return block_read_full_folio(folio, minix_get_block); 410 } 411 412 int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 413 { 414 return __block_write_begin(page, pos, len, minix_get_block); 415 } 416 417 static void minix_write_failed(struct address_space *mapping, loff_t to) 418 { 419 struct inode *inode = mapping->host; 420 421 if (to > inode->i_size) { 422 truncate_pagecache(inode, inode->i_size); 423 minix_truncate(inode); 424 } 425 } 426 427 static int minix_write_begin(struct file *file, struct address_space *mapping, 428 loff_t pos, unsigned len, 429 struct page **pagep, void **fsdata) 430 { 431 int ret; 432 433 ret = block_write_begin(mapping, pos, len, pagep, minix_get_block); 434 if (unlikely(ret)) 435 minix_write_failed(mapping, pos + len); 436 437 return ret; 438 } 439 440 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 441 { 442 return generic_block_bmap(mapping,block,minix_get_block); 443 } 444 445 static const struct address_space_operations minix_aops = { 446 .dirty_folio = block_dirty_folio, 447 .invalidate_folio = block_invalidate_folio, 448 .read_folio = minix_read_folio, 449 .writepages = minix_writepages, 450 .write_begin = minix_write_begin, 451 .write_end = generic_write_end, 452 .migrate_folio = buffer_migrate_folio, 453 .bmap = minix_bmap, 454 .direct_IO = noop_direct_IO 455 }; 456 457 static const struct inode_operations minix_symlink_inode_operations = { 458 .get_link = page_get_link, 459 .getattr = minix_getattr, 460 }; 461 462 void minix_set_inode(struct inode *inode, dev_t rdev) 463 { 464 if (S_ISREG(inode->i_mode)) { 465 inode->i_op = &minix_file_inode_operations; 466 inode->i_fop = &minix_file_operations; 467 inode->i_mapping->a_ops = &minix_aops; 468 } else if (S_ISDIR(inode->i_mode)) { 469 inode->i_op = &minix_dir_inode_operations; 470 inode->i_fop = &minix_dir_operations; 471 inode->i_mapping->a_ops = &minix_aops; 472 } else if (S_ISLNK(inode->i_mode)) { 473 inode->i_op = &minix_symlink_inode_operations; 474 inode_nohighmem(inode); 475 inode->i_mapping->a_ops = &minix_aops; 476 } else 477 init_special_inode(inode, inode->i_mode, rdev); 478 } 479 480 /* 481 * The minix V1 function to read an inode. 482 */ 483 static struct inode *V1_minix_iget(struct inode *inode) 484 { 485 struct buffer_head * bh; 486 struct minix_inode * raw_inode; 487 struct minix_inode_info *minix_inode = minix_i(inode); 488 int i; 489 490 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 491 if (!raw_inode) { 492 iget_failed(inode); 493 return ERR_PTR(-EIO); 494 } 495 if (raw_inode->i_nlinks == 0) { 496 printk("MINIX-fs: deleted inode referenced: %lu\n", 497 inode->i_ino); 498 brelse(bh); 499 iget_failed(inode); 500 return ERR_PTR(-ESTALE); 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_set_mtime_to_ts(inode, 508 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0))); 509 inode->i_blocks = 0; 510 for (i = 0; i < 9; i++) 511 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 512 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 513 brelse(bh); 514 unlock_new_inode(inode); 515 return inode; 516 } 517 518 /* 519 * The minix V2 function to read an inode. 520 */ 521 static struct inode *V2_minix_iget(struct inode *inode) 522 { 523 struct buffer_head * bh; 524 struct minix2_inode * raw_inode; 525 struct minix_inode_info *minix_inode = minix_i(inode); 526 int i; 527 528 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 529 if (!raw_inode) { 530 iget_failed(inode); 531 return ERR_PTR(-EIO); 532 } 533 if (raw_inode->i_nlinks == 0) { 534 printk("MINIX-fs: deleted inode referenced: %lu\n", 535 inode->i_ino); 536 brelse(bh); 537 iget_failed(inode); 538 return ERR_PTR(-ESTALE); 539 } 540 inode->i_mode = raw_inode->i_mode; 541 i_uid_write(inode, raw_inode->i_uid); 542 i_gid_write(inode, raw_inode->i_gid); 543 set_nlink(inode, raw_inode->i_nlinks); 544 inode->i_size = raw_inode->i_size; 545 inode_set_mtime(inode, raw_inode->i_mtime, 0); 546 inode_set_atime(inode, raw_inode->i_atime, 0); 547 inode_set_ctime(inode, raw_inode->i_ctime, 0); 548 inode->i_blocks = 0; 549 for (i = 0; i < 10; i++) 550 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 551 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 552 brelse(bh); 553 unlock_new_inode(inode); 554 return inode; 555 } 556 557 /* 558 * The global function to read an inode. 559 */ 560 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 561 { 562 struct inode *inode; 563 564 inode = iget_locked(sb, ino); 565 if (!inode) 566 return ERR_PTR(-ENOMEM); 567 if (!(inode->i_state & I_NEW)) 568 return inode; 569 570 if (INODE_VERSION(inode) == MINIX_V1) 571 return V1_minix_iget(inode); 572 else 573 return V2_minix_iget(inode); 574 } 575 576 /* 577 * The minix V1 function to synchronize an inode. 578 */ 579 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 580 { 581 struct buffer_head * bh; 582 struct minix_inode * raw_inode; 583 struct minix_inode_info *minix_inode = minix_i(inode); 584 int i; 585 586 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 587 if (!raw_inode) 588 return NULL; 589 raw_inode->i_mode = inode->i_mode; 590 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 591 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 592 raw_inode->i_nlinks = inode->i_nlink; 593 raw_inode->i_size = inode->i_size; 594 raw_inode->i_time = inode_get_mtime_sec(inode); 595 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 596 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 597 else for (i = 0; i < 9; i++) 598 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 599 mark_buffer_dirty(bh); 600 return bh; 601 } 602 603 /* 604 * The minix V2 function to synchronize an inode. 605 */ 606 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 607 { 608 struct buffer_head * bh; 609 struct minix2_inode * raw_inode; 610 struct minix_inode_info *minix_inode = minix_i(inode); 611 int i; 612 613 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 614 if (!raw_inode) 615 return NULL; 616 raw_inode->i_mode = inode->i_mode; 617 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 618 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 619 raw_inode->i_nlinks = inode->i_nlink; 620 raw_inode->i_size = inode->i_size; 621 raw_inode->i_mtime = inode_get_mtime_sec(inode); 622 raw_inode->i_atime = inode_get_atime_sec(inode); 623 raw_inode->i_ctime = inode_get_ctime_sec(inode); 624 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 625 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 626 else for (i = 0; i < 10; i++) 627 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 628 mark_buffer_dirty(bh); 629 return bh; 630 } 631 632 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 633 { 634 int err = 0; 635 struct buffer_head *bh; 636 637 if (INODE_VERSION(inode) == MINIX_V1) 638 bh = V1_minix_update_inode(inode); 639 else 640 bh = V2_minix_update_inode(inode); 641 if (!bh) 642 return -EIO; 643 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 644 sync_dirty_buffer(bh); 645 if (buffer_req(bh) && !buffer_uptodate(bh)) { 646 printk("IO error syncing minix inode [%s:%08lx]\n", 647 inode->i_sb->s_id, inode->i_ino); 648 err = -EIO; 649 } 650 } 651 brelse (bh); 652 return err; 653 } 654 655 int minix_getattr(struct mnt_idmap *idmap, const struct path *path, 656 struct kstat *stat, u32 request_mask, unsigned int flags) 657 { 658 struct super_block *sb = path->dentry->d_sb; 659 struct inode *inode = d_inode(path->dentry); 660 661 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 662 if (INODE_VERSION(inode) == MINIX_V1) 663 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 664 else 665 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 666 stat->blksize = sb->s_blocksize; 667 return 0; 668 } 669 670 /* 671 * The function that is called for file truncation. 672 */ 673 void minix_truncate(struct inode * inode) 674 { 675 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 676 return; 677 if (INODE_VERSION(inode) == MINIX_V1) 678 V1_minix_truncate(inode); 679 else 680 V2_minix_truncate(inode); 681 } 682 683 static struct dentry *minix_mount(struct file_system_type *fs_type, 684 int flags, const char *dev_name, void *data) 685 { 686 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); 687 } 688 689 static struct file_system_type minix_fs_type = { 690 .owner = THIS_MODULE, 691 .name = "minix", 692 .mount = minix_mount, 693 .kill_sb = kill_block_super, 694 .fs_flags = FS_REQUIRES_DEV, 695 }; 696 MODULE_ALIAS_FS("minix"); 697 698 static int __init init_minix_fs(void) 699 { 700 int err = init_inodecache(); 701 if (err) 702 goto out1; 703 err = register_filesystem(&minix_fs_type); 704 if (err) 705 goto out; 706 return 0; 707 out: 708 destroy_inodecache(); 709 out1: 710 return err; 711 } 712 713 static void __exit exit_minix_fs(void) 714 { 715 unregister_filesystem(&minix_fs_type); 716 destroy_inodecache(); 717 } 718 719 module_init(init_minix_fs) 720 module_exit(exit_minix_fs) 721 MODULE_LICENSE("GPL"); 722 723