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 if (!sb_set_blocksize(s, m3s->s_blocksize)) 296 goto out_release; 297 s->s_max_links = MINIX2_LINK_MAX; 298 } else 299 goto out_no_fs; 300 301 if (!minix_check_superblock(s)) 302 goto out_illegal_sb; 303 304 /* 305 * Allocate the buffer map to keep the superblock small. 306 */ 307 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 308 map = kzalloc(i, GFP_KERNEL); 309 if (!map) 310 goto out_no_map; 311 sbi->s_imap = &map[0]; 312 sbi->s_zmap = &map[sbi->s_imap_blocks]; 313 314 block=2; 315 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 316 if (!(sbi->s_imap[i]=sb_bread(s, block))) 317 goto out_no_bitmap; 318 block++; 319 } 320 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 321 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 322 goto out_no_bitmap; 323 block++; 324 } 325 326 minix_set_bit(0,sbi->s_imap[0]->b_data); 327 minix_set_bit(0,sbi->s_zmap[0]->b_data); 328 329 /* set up enough so that it can read an inode */ 330 s->s_op = &minix_sops; 331 s->s_time_min = 0; 332 s->s_time_max = U32_MAX; 333 root_inode = minix_iget(s, MINIX_ROOT_INO); 334 if (IS_ERR(root_inode)) { 335 ret = PTR_ERR(root_inode); 336 goto out_no_root; 337 } 338 339 ret = -ENOMEM; 340 s->s_root = d_make_root(root_inode); 341 if (!s->s_root) 342 goto out_no_root; 343 344 if (!sb_rdonly(s)) { 345 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 346 ms->s_state &= ~MINIX_VALID_FS; 347 mark_buffer_dirty(bh); 348 } 349 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 350 printk("MINIX-fs: mounting unchecked file system, " 351 "running fsck is recommended\n"); 352 else if (sbi->s_mount_state & MINIX_ERROR_FS) 353 printk("MINIX-fs: mounting file system with errors, " 354 "running fsck is recommended\n"); 355 356 return 0; 357 358 out_no_root: 359 if (!silent) 360 printk("MINIX-fs: get root inode failed\n"); 361 goto out_freemap; 362 363 out_no_bitmap: 364 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 365 out_freemap: 366 for (i = 0; i < sbi->s_imap_blocks; i++) 367 brelse(sbi->s_imap[i]); 368 for (i = 0; i < sbi->s_zmap_blocks; i++) 369 brelse(sbi->s_zmap[i]); 370 kfree(sbi->s_imap); 371 goto out_release; 372 373 out_no_map: 374 ret = -ENOMEM; 375 if (!silent) 376 printk("MINIX-fs: can't allocate map\n"); 377 goto out_release; 378 379 out_illegal_sb: 380 if (!silent) 381 printk("MINIX-fs: bad superblock\n"); 382 goto out_release; 383 384 out_no_fs: 385 if (!silent) 386 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 387 "on device %s.\n", s->s_id); 388 out_release: 389 brelse(bh); 390 goto out; 391 392 out_bad_hblock: 393 printk("MINIX-fs: blocksize too small for device\n"); 394 goto out; 395 396 out_bad_sb: 397 printk("MINIX-fs: unable to read superblock\n"); 398 out: 399 s->s_fs_info = NULL; 400 kfree(sbi); 401 return ret; 402 } 403 404 static int minix_get_tree(struct fs_context *fc) 405 { 406 return get_tree_bdev(fc, minix_fill_super); 407 } 408 409 static const struct fs_context_operations minix_context_ops = { 410 .get_tree = minix_get_tree, 411 .reconfigure = minix_reconfigure, 412 }; 413 414 static int minix_init_fs_context(struct fs_context *fc) 415 { 416 fc->ops = &minix_context_ops; 417 418 return 0; 419 } 420 421 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 422 { 423 struct super_block *sb = dentry->d_sb; 424 struct minix_sb_info *sbi = minix_sb(sb); 425 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 426 buf->f_type = sb->s_magic; 427 buf->f_bsize = sb->s_blocksize; 428 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 429 buf->f_bfree = minix_count_free_blocks(sb); 430 buf->f_bavail = buf->f_bfree; 431 buf->f_files = sbi->s_ninodes; 432 buf->f_ffree = minix_count_free_inodes(sb); 433 buf->f_namelen = sbi->s_namelen; 434 buf->f_fsid = u64_to_fsid(id); 435 436 return 0; 437 } 438 439 static int minix_get_block(struct inode *inode, sector_t block, 440 struct buffer_head *bh_result, int create) 441 { 442 if (INODE_VERSION(inode) == MINIX_V1) 443 return V1_minix_get_block(inode, block, bh_result, create); 444 else 445 return V2_minix_get_block(inode, block, bh_result, create); 446 } 447 448 static int minix_writepages(struct address_space *mapping, 449 struct writeback_control *wbc) 450 { 451 return mpage_writepages(mapping, wbc, minix_get_block); 452 } 453 454 static int minix_read_folio(struct file *file, struct folio *folio) 455 { 456 return block_read_full_folio(folio, minix_get_block); 457 } 458 459 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len) 460 { 461 return __block_write_begin(folio, pos, len, minix_get_block); 462 } 463 464 static void minix_write_failed(struct address_space *mapping, loff_t to) 465 { 466 struct inode *inode = mapping->host; 467 468 if (to > inode->i_size) { 469 truncate_pagecache(inode, inode->i_size); 470 minix_truncate(inode); 471 } 472 } 473 474 static int minix_write_begin(const struct kiocb *iocb, 475 struct address_space *mapping, 476 loff_t pos, unsigned len, 477 struct folio **foliop, void **fsdata) 478 { 479 int ret; 480 481 ret = block_write_begin(mapping, pos, len, foliop, minix_get_block); 482 if (unlikely(ret)) 483 minix_write_failed(mapping, pos + len); 484 485 return ret; 486 } 487 488 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 489 { 490 return generic_block_bmap(mapping,block,minix_get_block); 491 } 492 493 static const struct address_space_operations minix_aops = { 494 .dirty_folio = block_dirty_folio, 495 .invalidate_folio = block_invalidate_folio, 496 .read_folio = minix_read_folio, 497 .writepages = minix_writepages, 498 .write_begin = minix_write_begin, 499 .write_end = generic_write_end, 500 .migrate_folio = buffer_migrate_folio, 501 .bmap = minix_bmap, 502 .direct_IO = noop_direct_IO 503 }; 504 505 static const struct inode_operations minix_symlink_inode_operations = { 506 .get_link = page_get_link, 507 .getattr = minix_getattr, 508 }; 509 510 void minix_set_inode(struct inode *inode, dev_t rdev) 511 { 512 if (S_ISREG(inode->i_mode)) { 513 inode->i_op = &minix_file_inode_operations; 514 inode->i_fop = &minix_file_operations; 515 inode->i_mapping->a_ops = &minix_aops; 516 } else if (S_ISDIR(inode->i_mode)) { 517 inode->i_op = &minix_dir_inode_operations; 518 inode->i_fop = &minix_dir_operations; 519 inode->i_mapping->a_ops = &minix_aops; 520 } else if (S_ISLNK(inode->i_mode)) { 521 inode->i_op = &minix_symlink_inode_operations; 522 inode_nohighmem(inode); 523 inode->i_mapping->a_ops = &minix_aops; 524 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 525 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 526 init_special_inode(inode, inode->i_mode, rdev); 527 } else { 528 printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %llu.\n", 529 inode->i_mode, inode->i_ino); 530 make_bad_inode(inode); 531 } 532 } 533 534 /* 535 * The minix V1 function to read an inode. 536 */ 537 static struct inode *V1_minix_iget(struct inode *inode) 538 { 539 struct buffer_head * bh; 540 struct minix_inode * raw_inode; 541 struct minix_inode_info *minix_inode = minix_i(inode); 542 int i; 543 544 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 545 if (!raw_inode) { 546 iget_failed(inode); 547 return ERR_PTR(-EIO); 548 } 549 if (raw_inode->i_nlinks == 0) { 550 printk("MINIX-fs: deleted inode referenced: %llu\n", 551 inode->i_ino); 552 brelse(bh); 553 iget_failed(inode); 554 return ERR_PTR(-ESTALE); 555 } 556 inode->i_mode = raw_inode->i_mode; 557 i_uid_write(inode, raw_inode->i_uid); 558 i_gid_write(inode, raw_inode->i_gid); 559 set_nlink(inode, raw_inode->i_nlinks); 560 inode->i_size = raw_inode->i_size; 561 inode_set_mtime_to_ts(inode, 562 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0))); 563 inode->i_blocks = 0; 564 for (i = 0; i < 9; i++) 565 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 566 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 567 brelse(bh); 568 unlock_new_inode(inode); 569 return inode; 570 } 571 572 /* 573 * The minix V2 function to read an inode. 574 */ 575 static struct inode *V2_minix_iget(struct inode *inode) 576 { 577 struct buffer_head * bh; 578 struct minix2_inode * raw_inode; 579 struct minix_inode_info *minix_inode = minix_i(inode); 580 int i; 581 582 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 583 if (!raw_inode) { 584 iget_failed(inode); 585 return ERR_PTR(-EIO); 586 } 587 if (raw_inode->i_nlinks == 0) { 588 printk("MINIX-fs: deleted inode referenced: %llu\n", 589 inode->i_ino); 590 brelse(bh); 591 iget_failed(inode); 592 return ERR_PTR(-ESTALE); 593 } 594 inode->i_mode = raw_inode->i_mode; 595 i_uid_write(inode, raw_inode->i_uid); 596 i_gid_write(inode, raw_inode->i_gid); 597 set_nlink(inode, raw_inode->i_nlinks); 598 inode->i_size = raw_inode->i_size; 599 inode_set_mtime(inode, raw_inode->i_mtime, 0); 600 inode_set_atime(inode, raw_inode->i_atime, 0); 601 inode_set_ctime(inode, raw_inode->i_ctime, 0); 602 inode->i_blocks = 0; 603 for (i = 0; i < 10; i++) 604 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 605 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 606 brelse(bh); 607 unlock_new_inode(inode); 608 return inode; 609 } 610 611 /* 612 * The global function to read an inode. 613 */ 614 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 615 { 616 struct inode *inode; 617 618 inode = iget_locked(sb, ino); 619 if (!inode) 620 return ERR_PTR(-ENOMEM); 621 if (!(inode_state_read_once(inode) & I_NEW)) 622 return inode; 623 624 if (INODE_VERSION(inode) == MINIX_V1) 625 return V1_minix_iget(inode); 626 else 627 return V2_minix_iget(inode); 628 } 629 630 /* 631 * The minix V1 function to synchronize an inode. 632 */ 633 static struct buffer_head * V1_minix_update_inode(struct inode * inode) 634 { 635 struct buffer_head * bh; 636 struct minix_inode * raw_inode; 637 struct minix_inode_info *minix_inode = minix_i(inode); 638 int i; 639 640 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 641 if (!raw_inode) 642 return NULL; 643 raw_inode->i_mode = inode->i_mode; 644 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 645 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 646 raw_inode->i_nlinks = inode->i_nlink; 647 raw_inode->i_size = inode->i_size; 648 raw_inode->i_time = inode_get_mtime_sec(inode); 649 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 650 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 651 else for (i = 0; i < 9; i++) 652 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 653 mark_buffer_dirty(bh); 654 return bh; 655 } 656 657 /* 658 * The minix V2 function to synchronize an inode. 659 */ 660 static struct buffer_head * V2_minix_update_inode(struct inode * inode) 661 { 662 struct buffer_head * bh; 663 struct minix2_inode * raw_inode; 664 struct minix_inode_info *minix_inode = minix_i(inode); 665 int i; 666 667 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 668 if (!raw_inode) 669 return NULL; 670 raw_inode->i_mode = inode->i_mode; 671 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 672 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 673 raw_inode->i_nlinks = inode->i_nlink; 674 raw_inode->i_size = inode->i_size; 675 raw_inode->i_mtime = inode_get_mtime_sec(inode); 676 raw_inode->i_atime = inode_get_atime_sec(inode); 677 raw_inode->i_ctime = inode_get_ctime_sec(inode); 678 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 679 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 680 else for (i = 0; i < 10; i++) 681 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 682 mark_buffer_dirty(bh); 683 return bh; 684 } 685 686 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 687 { 688 int err = 0; 689 struct buffer_head *bh; 690 691 if (INODE_VERSION(inode) == MINIX_V1) 692 bh = V1_minix_update_inode(inode); 693 else 694 bh = V2_minix_update_inode(inode); 695 if (!bh) 696 return -EIO; 697 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 698 sync_dirty_buffer(bh); 699 if (buffer_req(bh) && !buffer_uptodate(bh)) { 700 printk("IO error syncing minix inode [%s:%08llx]\n", 701 inode->i_sb->s_id, inode->i_ino); 702 err = -EIO; 703 } 704 } 705 brelse (bh); 706 return err; 707 } 708 709 int minix_getattr(struct mnt_idmap *idmap, const struct path *path, 710 struct kstat *stat, u32 request_mask, unsigned int flags) 711 { 712 struct super_block *sb = path->dentry->d_sb; 713 struct inode *inode = d_inode(path->dentry); 714 715 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 716 if (INODE_VERSION(inode) == MINIX_V1) 717 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 718 else 719 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 720 stat->blksize = sb->s_blocksize; 721 return 0; 722 } 723 724 /* 725 * The function that is called for file truncation. 726 */ 727 void minix_truncate(struct inode * inode) 728 { 729 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 730 return; 731 if (INODE_VERSION(inode) == MINIX_V1) 732 V1_minix_truncate(inode); 733 else 734 V2_minix_truncate(inode); 735 } 736 737 static struct file_system_type minix_fs_type = { 738 .owner = THIS_MODULE, 739 .name = "minix", 740 .kill_sb = kill_block_super, 741 .fs_flags = FS_REQUIRES_DEV, 742 .init_fs_context = minix_init_fs_context, 743 }; 744 MODULE_ALIAS_FS("minix"); 745 746 static int __init init_minix_fs(void) 747 { 748 int err = init_inodecache(); 749 if (err) 750 goto out1; 751 err = register_filesystem(&minix_fs_type); 752 if (err) 753 goto out; 754 return 0; 755 out: 756 destroy_inodecache(); 757 out1: 758 return err; 759 } 760 761 static void __exit exit_minix_fs(void) 762 { 763 unregister_filesystem(&minix_fs_type); 764 destroy_inodecache(); 765 } 766 767 module_init(init_minix_fs) 768 module_exit(exit_minix_fs) 769 MODULE_DESCRIPTION("Minix file system"); 770 MODULE_LICENSE("GPL"); 771 772