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 #include <linux/fs_context.h> 24 25 static int minix_write_inode(struct inode *inode, 26 struct writeback_control *wbc); 27 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 28 29 void __minix_error_inode(struct inode *inode, const char *function, 30 unsigned int line, const char *fmt, ...) 31 { 32 struct va_format vaf; 33 va_list args; 34 35 va_start(args, fmt); 36 vaf.fmt = fmt; 37 vaf.va = &args; 38 printk(KERN_CRIT "minix-fs error (device %s): %s:%d: " 39 "inode #%llu: comm %s: %pV\n", 40 inode->i_sb->s_id, function, line, inode->i_ino, 41 current->comm, &vaf); 42 va_end(args); 43 } 44 45 static void minix_evict_inode(struct inode *inode) 46 { 47 truncate_inode_pages_final(&inode->i_data); 48 if (!inode->i_nlink) { 49 inode->i_size = 0; 50 minix_truncate(inode); 51 } else { 52 mmb_sync(&minix_i(inode)->i_metadata_bhs); 53 } 54 mmb_invalidate(&minix_i(inode)->i_metadata_bhs); 55 clear_inode(inode); 56 if (!inode->i_nlink) 57 minix_free_inode(inode); 58 } 59 60 static void minix_put_super(struct super_block *sb) 61 { 62 int i; 63 struct minix_sb_info *sbi = minix_sb(sb); 64 65 if (!sb_rdonly(sb)) { 66 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 67 sbi->s_ms->s_state = sbi->s_mount_state; 68 mark_buffer_dirty(sbi->s_sbh); 69 } 70 for (i = 0; i < sbi->s_imap_blocks; i++) 71 brelse(sbi->s_imap[i]); 72 for (i = 0; i < sbi->s_zmap_blocks; i++) 73 brelse(sbi->s_zmap[i]); 74 brelse (sbi->s_sbh); 75 kfree(sbi->s_imap); 76 sb->s_fs_info = NULL; 77 kfree(sbi); 78 } 79 80 static struct kmem_cache * minix_inode_cachep; 81 82 static struct inode *minix_alloc_inode(struct super_block *sb) 83 { 84 struct minix_inode_info *ei; 85 ei = alloc_inode_sb(sb, minix_inode_cachep, GFP_KERNEL); 86 if (!ei) 87 return NULL; 88 mmb_init(&ei->i_metadata_bhs, &ei->vfs_inode.i_data); 89 90 return &ei->vfs_inode; 91 } 92 93 static void minix_free_in_core_inode(struct inode *inode) 94 { 95 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 96 } 97 98 static void init_once(void *foo) 99 { 100 struct minix_inode_info *ei = (struct minix_inode_info *) foo; 101 102 inode_init_once(&ei->vfs_inode); 103 } 104 105 static int __init init_inodecache(void) 106 { 107 minix_inode_cachep = kmem_cache_create("minix_inode_cache", 108 sizeof(struct minix_inode_info), 109 0, (SLAB_RECLAIM_ACCOUNT| 110 SLAB_ACCOUNT), 111 init_once); 112 if (minix_inode_cachep == NULL) 113 return -ENOMEM; 114 return 0; 115 } 116 117 static void destroy_inodecache(void) 118 { 119 /* 120 * Make sure all delayed rcu free inodes are flushed before we 121 * destroy cache. 122 */ 123 rcu_barrier(); 124 kmem_cache_destroy(minix_inode_cachep); 125 } 126 127 static const struct super_operations minix_sops = { 128 .alloc_inode = minix_alloc_inode, 129 .free_inode = minix_free_in_core_inode, 130 .write_inode = minix_write_inode, 131 .evict_inode = minix_evict_inode, 132 .put_super = minix_put_super, 133 .statfs = minix_statfs, 134 }; 135 136 static int minix_reconfigure(struct fs_context *fc) 137 { 138 struct minix_super_block * ms; 139 struct super_block *sb = fc->root->d_sb; 140 struct minix_sb_info * sbi = sb->s_fs_info; 141 142 sync_filesystem(sb); 143 ms = sbi->s_ms; 144 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 145 return 0; 146 if (fc->sb_flags & SB_RDONLY) { 147 if (ms->s_state & MINIX_VALID_FS || 148 !(sbi->s_mount_state & MINIX_VALID_FS)) 149 return 0; 150 /* Mounting a rw partition read-only. */ 151 if (sbi->s_version != MINIX_V3) 152 ms->s_state = sbi->s_mount_state; 153 mark_buffer_dirty(sbi->s_sbh); 154 } else { 155 /* Mount a partition which is read-only, read-write. */ 156 if (sbi->s_version != MINIX_V3) { 157 sbi->s_mount_state = ms->s_state; 158 ms->s_state &= ~MINIX_VALID_FS; 159 } else { 160 sbi->s_mount_state = MINIX_VALID_FS; 161 } 162 mark_buffer_dirty(sbi->s_sbh); 163 164 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 165 printk("MINIX-fs warning: remounting unchecked fs, " 166 "running fsck is recommended\n"); 167 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 168 printk("MINIX-fs warning: remounting fs with errors, " 169 "running fsck is recommended\n"); 170 } 171 return 0; 172 } 173 174 static bool minix_check_superblock(struct super_block *sb) 175 { 176 struct minix_sb_info *sbi = minix_sb(sb); 177 unsigned long block; 178 179 if (sbi->s_log_zone_size != 0) { 180 printk("minix-fs error: zone size must equal block size. " 181 "s_log_zone_size > 0 is not supported.\n"); 182 return false; 183 } 184 185 if (sbi->s_ninodes < 1 || sbi->s_firstdatazone <= 4 || 186 sbi->s_firstdatazone >= sbi->s_nzones) 187 return false; 188 189 /* Apparently minix can create filesystems that allocate more blocks for 190 * the bitmaps than needed. We simply ignore that, but verify it didn't 191 * create one with not enough blocks and bail out if so. 192 */ 193 block = minix_blocks_needed(sbi->s_ninodes, sb->s_blocksize); 194 if (sbi->s_imap_blocks < block) { 195 printk("MINIX-fs: file system does not have enough " 196 "imap blocks allocated. Refusing to mount.\n"); 197 return false; 198 } 199 200 block = minix_blocks_needed( 201 (sbi->s_nzones - sbi->s_firstdatazone + 1), 202 sb->s_blocksize); 203 if (sbi->s_zmap_blocks < block) { 204 printk("MINIX-fs: file system does not have enough " 205 "zmap blocks allocated. Refusing to mount.\n"); 206 return false; 207 } 208 209 /* 210 * s_max_size must not exceed the block mapping limitation. This check 211 * is only needed for V1 filesystems, since V2/V3 support an extra level 212 * of indirect blocks which places the limit well above U32_MAX. 213 */ 214 if (sbi->s_version == MINIX_V1 && 215 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) 216 return false; 217 218 return true; 219 } 220 221 static int minix_fill_super(struct super_block *s, struct fs_context *fc) 222 { 223 struct buffer_head *bh; 224 struct buffer_head **map; 225 struct minix_super_block *ms; 226 struct minix3_super_block *m3s = NULL; 227 unsigned long i, block; 228 struct inode *root_inode; 229 struct minix_sb_info *sbi; 230 int ret = -EINVAL; 231 int silent = fc->sb_flags & SB_SILENT; 232 233 sbi = kzalloc_obj(struct minix_sb_info); 234 if (!sbi) 235 return -ENOMEM; 236 s->s_fs_info = sbi; 237 238 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 239 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 240 241 if (!sb_set_blocksize(s, BLOCK_SIZE)) 242 goto out_bad_hblock; 243 244 if (!(bh = sb_bread(s, 1))) 245 goto out_bad_sb; 246 247 ms = (struct minix_super_block *) bh->b_data; 248 sbi->s_ms = ms; 249 sbi->s_sbh = bh; 250 sbi->s_mount_state = ms->s_state; 251 sbi->s_ninodes = ms->s_ninodes; 252 sbi->s_nzones = ms->s_nzones; 253 sbi->s_imap_blocks = ms->s_imap_blocks; 254 sbi->s_zmap_blocks = ms->s_zmap_blocks; 255 sbi->s_firstdatazone = ms->s_firstdatazone; 256 sbi->s_log_zone_size = ms->s_log_zone_size; 257 s->s_maxbytes = ms->s_max_size; 258 s->s_magic = ms->s_magic; 259 if (s->s_magic == MINIX_SUPER_MAGIC) { 260 sbi->s_version = MINIX_V1; 261 sbi->s_dirsize = 16; 262 sbi->s_namelen = 14; 263 s->s_max_links = MINIX_LINK_MAX; 264 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 265 sbi->s_version = MINIX_V1; 266 sbi->s_dirsize = 32; 267 sbi->s_namelen = 30; 268 s->s_max_links = MINIX_LINK_MAX; 269 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 270 sbi->s_version = MINIX_V2; 271 sbi->s_nzones = ms->s_zones; 272 sbi->s_dirsize = 16; 273 sbi->s_namelen = 14; 274 s->s_max_links = MINIX2_LINK_MAX; 275 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 276 sbi->s_version = MINIX_V2; 277 sbi->s_nzones = ms->s_zones; 278 sbi->s_dirsize = 32; 279 sbi->s_namelen = 30; 280 s->s_max_links = MINIX2_LINK_MAX; 281 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 282 m3s = (struct minix3_super_block *) bh->b_data; 283 s->s_magic = m3s->s_magic; 284 sbi->s_imap_blocks = m3s->s_imap_blocks; 285 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 286 sbi->s_firstdatazone = m3s->s_firstdatazone; 287 sbi->s_log_zone_size = m3s->s_log_zone_size; 288 s->s_maxbytes = m3s->s_max_size; 289 sbi->s_ninodes = m3s->s_ninodes; 290 sbi->s_nzones = m3s->s_zones; 291 sbi->s_dirsize = 64; 292 sbi->s_namelen = 60; 293 sbi->s_version = MINIX_V3; 294 sbi->s_mount_state = MINIX_VALID_FS; 295 sb_set_blocksize(s, m3s->s_blocksize); 296 s->s_max_links = MINIX2_LINK_MAX; 297 } else 298 goto out_no_fs; 299 300 if (!minix_check_superblock(s)) 301 goto out_illegal_sb; 302 303 /* 304 * Allocate the buffer map to keep the superblock small. 305 */ 306 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 307 map = kzalloc(i, GFP_KERNEL); 308 if (!map) 309 goto out_no_map; 310 sbi->s_imap = &map[0]; 311 sbi->s_zmap = &map[sbi->s_imap_blocks]; 312 313 block=2; 314 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 315 if (!(sbi->s_imap[i]=sb_bread(s, block))) 316 goto out_no_bitmap; 317 block++; 318 } 319 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 320 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 321 goto out_no_bitmap; 322 block++; 323 } 324 325 minix_set_bit(0,sbi->s_imap[0]->b_data); 326 minix_set_bit(0,sbi->s_zmap[0]->b_data); 327 328 /* set up enough so that it can read an inode */ 329 s->s_op = &minix_sops; 330 s->s_time_min = 0; 331 s->s_time_max = U32_MAX; 332 root_inode = minix_iget(s, MINIX_ROOT_INO); 333 if (IS_ERR(root_inode)) { 334 ret = PTR_ERR(root_inode); 335 goto out_no_root; 336 } 337 338 ret = -ENOMEM; 339 s->s_root = d_make_root(root_inode); 340 if (!s->s_root) 341 goto out_no_root; 342 343 if (!sb_rdonly(s)) { 344 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 345 ms->s_state &= ~MINIX_VALID_FS; 346 mark_buffer_dirty(bh); 347 } 348 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 349 printk("MINIX-fs: mounting unchecked file system, " 350 "running fsck is recommended\n"); 351 else if (sbi->s_mount_state & MINIX_ERROR_FS) 352 printk("MINIX-fs: mounting file system with errors, " 353 "running fsck is recommended\n"); 354 355 return 0; 356 357 out_no_root: 358 if (!silent) 359 printk("MINIX-fs: get root inode failed\n"); 360 goto out_freemap; 361 362 out_no_bitmap: 363 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 364 out_freemap: 365 for (i = 0; i < sbi->s_imap_blocks; i++) 366 brelse(sbi->s_imap[i]); 367 for (i = 0; i < sbi->s_zmap_blocks; i++) 368 brelse(sbi->s_zmap[i]); 369 kfree(sbi->s_imap); 370 goto out_release; 371 372 out_no_map: 373 ret = -ENOMEM; 374 if (!silent) 375 printk("MINIX-fs: can't allocate map\n"); 376 goto out_release; 377 378 out_illegal_sb: 379 if (!silent) 380 printk("MINIX-fs: bad superblock\n"); 381 goto out_release; 382 383 out_no_fs: 384 if (!silent) 385 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 386 "on device %s.\n", s->s_id); 387 out_release: 388 brelse(bh); 389 goto out; 390 391 out_bad_hblock: 392 printk("MINIX-fs: blocksize too small for device\n"); 393 goto out; 394 395 out_bad_sb: 396 printk("MINIX-fs: unable to read superblock\n"); 397 out: 398 s->s_fs_info = NULL; 399 kfree(sbi); 400 return ret; 401 } 402 403 static int minix_get_tree(struct fs_context *fc) 404 { 405 return get_tree_bdev(fc, minix_fill_super); 406 } 407 408 static const struct fs_context_operations minix_context_ops = { 409 .get_tree = minix_get_tree, 410 .reconfigure = minix_reconfigure, 411 }; 412 413 static int minix_init_fs_context(struct fs_context *fc) 414 { 415 fc->ops = &minix_context_ops; 416 417 return 0; 418 } 419 420 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 421 { 422 struct super_block *sb = dentry->d_sb; 423 struct minix_sb_info *sbi = minix_sb(sb); 424 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 425 buf->f_type = sb->s_magic; 426 buf->f_bsize = sb->s_blocksize; 427 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 428 buf->f_bfree = minix_count_free_blocks(sb); 429 buf->f_bavail = buf->f_bfree; 430 buf->f_files = sbi->s_ninodes; 431 buf->f_ffree = minix_count_free_inodes(sb); 432 buf->f_namelen = sbi->s_namelen; 433 buf->f_fsid = u64_to_fsid(id); 434 435 return 0; 436 } 437 438 static int minix_get_block(struct inode *inode, sector_t block, 439 struct buffer_head *bh_result, int create) 440 { 441 if (INODE_VERSION(inode) == MINIX_V1) 442 return V1_minix_get_block(inode, block, bh_result, create); 443 else 444 return V2_minix_get_block(inode, block, bh_result, create); 445 } 446 447 static int minix_writepages(struct address_space *mapping, 448 struct writeback_control *wbc) 449 { 450 return mpage_writepages(mapping, wbc, minix_get_block); 451 } 452 453 static int minix_read_folio(struct file *file, struct folio *folio) 454 { 455 return block_read_full_folio(folio, minix_get_block); 456 } 457 458 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len) 459 { 460 return __block_write_begin(folio, pos, len, minix_get_block); 461 } 462 463 static void minix_write_failed(struct address_space *mapping, loff_t to) 464 { 465 struct inode *inode = mapping->host; 466 467 if (to > inode->i_size) { 468 truncate_pagecache(inode, inode->i_size); 469 minix_truncate(inode); 470 } 471 } 472 473 static int minix_write_begin(const struct kiocb *iocb, 474 struct address_space *mapping, 475 loff_t pos, unsigned len, 476 struct folio **foliop, void **fsdata) 477 { 478 int ret; 479 480 ret = block_write_begin(mapping, pos, len, foliop, minix_get_block); 481 if (unlikely(ret)) 482 minix_write_failed(mapping, pos + len); 483 484 return ret; 485 } 486 487 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 488 { 489 return generic_block_bmap(mapping,block,minix_get_block); 490 } 491 492 static const struct address_space_operations minix_aops = { 493 .dirty_folio = block_dirty_folio, 494 .invalidate_folio = block_invalidate_folio, 495 .read_folio = minix_read_folio, 496 .writepages = minix_writepages, 497 .write_begin = minix_write_begin, 498 .write_end = generic_write_end, 499 .migrate_folio = buffer_migrate_folio, 500 .bmap = minix_bmap, 501 .direct_IO = noop_direct_IO 502 }; 503 504 static const struct inode_operations minix_symlink_inode_operations = { 505 .get_link = page_get_link, 506 .getattr = minix_getattr, 507 }; 508 509 void minix_set_inode(struct inode *inode, dev_t rdev) 510 { 511 if (S_ISREG(inode->i_mode)) { 512 inode->i_op = &minix_file_inode_operations; 513 inode->i_fop = &minix_file_operations; 514 inode->i_mapping->a_ops = &minix_aops; 515 } else if (S_ISDIR(inode->i_mode)) { 516 inode->i_op = &minix_dir_inode_operations; 517 inode->i_fop = &minix_dir_operations; 518 inode->i_mapping->a_ops = &minix_aops; 519 } else if (S_ISLNK(inode->i_mode)) { 520 inode->i_op = &minix_symlink_inode_operations; 521 inode_nohighmem(inode); 522 inode->i_mapping->a_ops = &minix_aops; 523 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 524 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 525 init_special_inode(inode, inode->i_mode, rdev); 526 } else { 527 printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %llu.\n", 528 inode->i_mode, inode->i_ino); 529 make_bad_inode(inode); 530 } 531 } 532 533 /* 534 * The minix V1 function to read an inode. 535 */ 536 static struct inode *V1_minix_iget(struct inode *inode) 537 { 538 struct buffer_head * bh; 539 struct minix_inode * raw_inode; 540 struct minix_inode_info *minix_inode = minix_i(inode); 541 int i; 542 543 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 544 if (!raw_inode) { 545 iget_failed(inode); 546 return ERR_PTR(-EIO); 547 } 548 if (raw_inode->i_nlinks == 0) { 549 printk("MINIX-fs: deleted inode referenced: %llu\n", 550 inode->i_ino); 551 brelse(bh); 552 iget_failed(inode); 553 return ERR_PTR(-ESTALE); 554 } 555 inode->i_mode = raw_inode->i_mode; 556 i_uid_write(inode, raw_inode->i_uid); 557 i_gid_write(inode, raw_inode->i_gid); 558 set_nlink(inode, raw_inode->i_nlinks); 559 inode->i_size = raw_inode->i_size; 560 inode_set_mtime_to_ts(inode, 561 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0))); 562 inode->i_blocks = 0; 563 for (i = 0; i < 9; i++) 564 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 565 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 566 brelse(bh); 567 unlock_new_inode(inode); 568 return inode; 569 } 570 571 /* 572 * The minix V2 function to read an inode. 573 */ 574 static struct inode *V2_minix_iget(struct inode *inode) 575 { 576 struct buffer_head * bh; 577 struct minix2_inode * raw_inode; 578 struct minix_inode_info *minix_inode = minix_i(inode); 579 int i; 580 581 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 582 if (!raw_inode) { 583 iget_failed(inode); 584 return ERR_PTR(-EIO); 585 } 586 if (raw_inode->i_nlinks == 0) { 587 printk("MINIX-fs: deleted inode referenced: %llu\n", 588 inode->i_ino); 589 brelse(bh); 590 iget_failed(inode); 591 return ERR_PTR(-ESTALE); 592 } 593 inode->i_mode = raw_inode->i_mode; 594 i_uid_write(inode, raw_inode->i_uid); 595 i_gid_write(inode, raw_inode->i_gid); 596 set_nlink(inode, raw_inode->i_nlinks); 597 inode->i_size = raw_inode->i_size; 598 inode_set_mtime(inode, raw_inode->i_mtime, 0); 599 inode_set_atime(inode, raw_inode->i_atime, 0); 600 inode_set_ctime(inode, raw_inode->i_ctime, 0); 601 inode->i_blocks = 0; 602 for (i = 0; i < 10; i++) 603 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 604 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 605 brelse(bh); 606 unlock_new_inode(inode); 607 return inode; 608 } 609 610 /* 611 * The global function to read an inode. 612 */ 613 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 614 { 615 struct inode *inode; 616 617 inode = iget_locked(sb, ino); 618 if (!inode) 619 return ERR_PTR(-ENOMEM); 620 if (!(inode_state_read_once(inode) & I_NEW)) 621 return inode; 622 623 if (INODE_VERSION(inode) == MINIX_V1) 624 return V1_minix_iget(inode); 625 else 626 return V2_minix_iget(inode); 627 } 628 629 /* 630 * The minix V1 function to synchronize an inode. 631 */ 632 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 633 { 634 struct buffer_head * bh; 635 struct minix_inode * raw_inode; 636 struct minix_inode_info *minix_inode = minix_i(inode); 637 int i; 638 639 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 640 if (!raw_inode) 641 return NULL; 642 raw_inode->i_mode = inode->i_mode; 643 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 644 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 645 raw_inode->i_nlinks = inode->i_nlink; 646 raw_inode->i_size = inode->i_size; 647 raw_inode->i_time = inode_get_mtime_sec(inode); 648 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 649 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 650 else for (i = 0; i < 9; i++) 651 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 652 mark_buffer_dirty(bh); 653 return bh; 654 } 655 656 /* 657 * The minix V2 function to synchronize an inode. 658 */ 659 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 660 { 661 struct buffer_head * bh; 662 struct minix2_inode * raw_inode; 663 struct minix_inode_info *minix_inode = minix_i(inode); 664 int i; 665 666 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 667 if (!raw_inode) 668 return NULL; 669 raw_inode->i_mode = inode->i_mode; 670 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 671 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 672 raw_inode->i_nlinks = inode->i_nlink; 673 raw_inode->i_size = inode->i_size; 674 raw_inode->i_mtime = inode_get_mtime_sec(inode); 675 raw_inode->i_atime = inode_get_atime_sec(inode); 676 raw_inode->i_ctime = inode_get_ctime_sec(inode); 677 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 678 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 679 else for (i = 0; i < 10; i++) 680 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 681 mark_buffer_dirty(bh); 682 return bh; 683 } 684 685 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 686 { 687 int err = 0; 688 struct buffer_head *bh; 689 690 if (INODE_VERSION(inode) == MINIX_V1) 691 bh = V1_minix_update_inode(inode); 692 else 693 bh = V2_minix_update_inode(inode); 694 if (!bh) 695 return -EIO; 696 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 697 sync_dirty_buffer(bh); 698 if (buffer_req(bh) && !buffer_uptodate(bh)) { 699 printk("IO error syncing minix inode [%s:%08llx]\n", 700 inode->i_sb->s_id, inode->i_ino); 701 err = -EIO; 702 } 703 } 704 brelse (bh); 705 return err; 706 } 707 708 int minix_getattr(struct mnt_idmap *idmap, const struct path *path, 709 struct kstat *stat, u32 request_mask, unsigned int flags) 710 { 711 struct super_block *sb = path->dentry->d_sb; 712 struct inode *inode = d_inode(path->dentry); 713 714 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 715 if (INODE_VERSION(inode) == MINIX_V1) 716 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 717 else 718 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 719 stat->blksize = sb->s_blocksize; 720 return 0; 721 } 722 723 /* 724 * The function that is called for file truncation. 725 */ 726 void minix_truncate(struct inode * inode) 727 { 728 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 729 return; 730 if (INODE_VERSION(inode) == MINIX_V1) 731 V1_minix_truncate(inode); 732 else 733 V2_minix_truncate(inode); 734 } 735 736 static struct file_system_type minix_fs_type = { 737 .owner = THIS_MODULE, 738 .name = "minix", 739 .kill_sb = kill_block_super, 740 .fs_flags = FS_REQUIRES_DEV, 741 .init_fs_context = minix_init_fs_context, 742 }; 743 MODULE_ALIAS_FS("minix"); 744 745 static int __init init_minix_fs(void) 746 { 747 int err = init_inodecache(); 748 if (err) 749 goto out1; 750 err = register_filesystem(&minix_fs_type); 751 if (err) 752 goto out; 753 return 0; 754 out: 755 destroy_inodecache(); 756 out1: 757 return err; 758 } 759 760 static void __exit exit_minix_fs(void) 761 { 762 unregister_filesystem(&minix_fs_type); 763 destroy_inodecache(); 764 } 765 766 module_init(init_minix_fs) 767 module_exit(exit_minix_fs) 768 MODULE_DESCRIPTION("Minix file system"); 769 MODULE_LICENSE("GPL"); 770 771