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_sync_inode_metadata(struct inode *inode, 28 struct writeback_control *wbc); 29 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 30 31 void __minix_error_inode(struct inode *inode, const char *function, 32 unsigned int line, const char *fmt, ...) 33 { 34 struct va_format vaf; 35 va_list args; 36 37 va_start(args, fmt); 38 vaf.fmt = fmt; 39 vaf.va = &args; 40 printk(KERN_CRIT "minix-fs error (device %s): %s:%d: " 41 "inode #%llu: comm %s: %pV\n", 42 inode->i_sb->s_id, function, line, inode->i_ino, 43 current->comm, &vaf); 44 va_end(args); 45 } 46 47 static void minix_evict_inode(struct inode *inode) 48 { 49 truncate_inode_pages_final(&inode->i_data); 50 if (!inode->i_nlink) { 51 inode->i_size = 0; 52 minix_truncate(inode); 53 } else { 54 mmb_sync(&minix_i(inode)->i_metadata_bhs); 55 } 56 mmb_invalidate(&minix_i(inode)->i_metadata_bhs); 57 clear_inode(inode); 58 if (!inode->i_nlink) 59 minix_free_inode(inode); 60 } 61 62 static void minix_put_super(struct super_block *sb) 63 { 64 int i; 65 struct minix_sb_info *sbi = minix_sb(sb); 66 67 if (!sb_rdonly(sb)) { 68 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 69 sbi->s_ms->s_state = sbi->s_mount_state; 70 mark_buffer_dirty(sbi->s_sbh); 71 } 72 for (i = 0; i < sbi->s_imap_blocks; i++) 73 brelse(sbi->s_imap[i]); 74 for (i = 0; i < sbi->s_zmap_blocks; i++) 75 brelse(sbi->s_zmap[i]); 76 brelse (sbi->s_sbh); 77 kfree(sbi->s_imap); 78 sb->s_fs_info = NULL; 79 kfree(sbi); 80 } 81 82 static struct kmem_cache * minix_inode_cachep; 83 84 static struct inode *minix_alloc_inode(struct super_block *sb) 85 { 86 struct minix_inode_info *ei; 87 ei = alloc_inode_sb(sb, minix_inode_cachep, GFP_KERNEL); 88 if (!ei) 89 return NULL; 90 mmb_init(&ei->i_metadata_bhs, &ei->vfs_inode.i_data); 91 92 return &ei->vfs_inode; 93 } 94 95 static void minix_free_in_core_inode(struct inode *inode) 96 { 97 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 98 } 99 100 static void init_once(void *foo) 101 { 102 struct minix_inode_info *ei = (struct minix_inode_info *) foo; 103 104 inode_init_once(&ei->vfs_inode); 105 } 106 107 static int __init init_inodecache(void) 108 { 109 minix_inode_cachep = kmem_cache_create("minix_inode_cache", 110 sizeof(struct minix_inode_info), 111 0, (SLAB_RECLAIM_ACCOUNT| 112 SLAB_ACCOUNT), 113 init_once); 114 if (minix_inode_cachep == NULL) 115 return -ENOMEM; 116 return 0; 117 } 118 119 static void destroy_inodecache(void) 120 { 121 /* 122 * Make sure all delayed rcu free inodes are flushed before we 123 * destroy cache. 124 */ 125 rcu_barrier(); 126 kmem_cache_destroy(minix_inode_cachep); 127 } 128 129 static const struct super_operations minix_sops = { 130 .alloc_inode = minix_alloc_inode, 131 .free_inode = minix_free_in_core_inode, 132 .write_inode = minix_write_inode, 133 .sync_inode_metadata = minix_sync_inode_metadata, 134 .evict_inode = minix_evict_inode, 135 .put_super = minix_put_super, 136 .statfs = minix_statfs, 137 }; 138 139 static int minix_reconfigure(struct fs_context *fc) 140 { 141 struct minix_super_block * ms; 142 struct super_block *sb = fc->root->d_sb; 143 struct minix_sb_info * sbi = sb->s_fs_info; 144 145 sync_filesystem(sb); 146 ms = sbi->s_ms; 147 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 148 return 0; 149 if (fc->sb_flags & SB_RDONLY) { 150 if (ms->s_state & MINIX_VALID_FS || 151 !(sbi->s_mount_state & MINIX_VALID_FS)) 152 return 0; 153 /* Mounting a rw partition read-only. */ 154 if (sbi->s_version != MINIX_V3) 155 ms->s_state = sbi->s_mount_state; 156 mark_buffer_dirty(sbi->s_sbh); 157 } else { 158 /* Mount a partition which is read-only, read-write. */ 159 if (sbi->s_version != MINIX_V3) { 160 sbi->s_mount_state = ms->s_state; 161 ms->s_state &= ~MINIX_VALID_FS; 162 } else { 163 sbi->s_mount_state = MINIX_VALID_FS; 164 } 165 mark_buffer_dirty(sbi->s_sbh); 166 167 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 168 printk("MINIX-fs warning: remounting unchecked fs, " 169 "running fsck is recommended\n"); 170 else if ((sbi->s_mount_state & MINIX_ERROR_FS)) 171 printk("MINIX-fs warning: remounting fs with errors, " 172 "running fsck is recommended\n"); 173 } 174 return 0; 175 } 176 177 static bool minix_check_superblock(struct super_block *sb) 178 { 179 struct minix_sb_info *sbi = minix_sb(sb); 180 unsigned long block; 181 182 if (sbi->s_log_zone_size != 0) { 183 printk("minix-fs error: zone size must equal block size. " 184 "s_log_zone_size > 0 is not supported.\n"); 185 return false; 186 } 187 188 if (sbi->s_ninodes < 1 || sbi->s_firstdatazone <= 4 || 189 sbi->s_firstdatazone >= sbi->s_nzones) 190 return false; 191 192 /* Apparently minix can create filesystems that allocate more blocks for 193 * the bitmaps than needed. We simply ignore that, but verify it didn't 194 * create one with not enough blocks and bail out if so. 195 */ 196 block = minix_blocks_needed(sbi->s_ninodes, sb->s_blocksize); 197 if (sbi->s_imap_blocks < block) { 198 printk("MINIX-fs: file system does not have enough " 199 "imap blocks allocated. Refusing to mount.\n"); 200 return false; 201 } 202 203 block = minix_blocks_needed( 204 (sbi->s_nzones - sbi->s_firstdatazone + 1), 205 sb->s_blocksize); 206 if (sbi->s_zmap_blocks < block) { 207 printk("MINIX-fs: file system does not have enough " 208 "zmap blocks allocated. Refusing to mount.\n"); 209 return false; 210 } 211 212 /* 213 * s_max_size must not exceed the block mapping limitation. This check 214 * is only needed for V1 filesystems, since V2/V3 support an extra level 215 * of indirect blocks which places the limit well above U32_MAX. 216 */ 217 if (sbi->s_version == MINIX_V1 && 218 sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) 219 return false; 220 221 return true; 222 } 223 224 static int minix_fill_super(struct super_block *s, struct fs_context *fc) 225 { 226 struct buffer_head *bh; 227 struct buffer_head **map; 228 struct minix_super_block *ms; 229 struct minix3_super_block *m3s = NULL; 230 unsigned long i, block; 231 struct inode *root_inode; 232 struct minix_sb_info *sbi; 233 int ret = -EINVAL; 234 int silent = fc->sb_flags & SB_SILENT; 235 236 sbi = kzalloc_obj(struct minix_sb_info); 237 if (!sbi) 238 return -ENOMEM; 239 s->s_fs_info = sbi; 240 241 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 242 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 243 244 if (!sb_set_blocksize(s, BLOCK_SIZE)) 245 goto out_bad_hblock; 246 247 if (!(bh = sb_bread(s, 1))) 248 goto out_bad_sb; 249 250 ms = (struct minix_super_block *) bh->b_data; 251 sbi->s_ms = ms; 252 sbi->s_sbh = bh; 253 sbi->s_mount_state = ms->s_state; 254 sbi->s_ninodes = ms->s_ninodes; 255 sbi->s_nzones = ms->s_nzones; 256 sbi->s_imap_blocks = ms->s_imap_blocks; 257 sbi->s_zmap_blocks = ms->s_zmap_blocks; 258 sbi->s_firstdatazone = ms->s_firstdatazone; 259 sbi->s_log_zone_size = ms->s_log_zone_size; 260 s->s_maxbytes = ms->s_max_size; 261 s->s_magic = ms->s_magic; 262 if (s->s_magic == MINIX_SUPER_MAGIC) { 263 sbi->s_version = MINIX_V1; 264 sbi->s_dirsize = 16; 265 sbi->s_namelen = 14; 266 s->s_max_links = MINIX_LINK_MAX; 267 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 268 sbi->s_version = MINIX_V1; 269 sbi->s_dirsize = 32; 270 sbi->s_namelen = 30; 271 s->s_max_links = MINIX_LINK_MAX; 272 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 273 sbi->s_version = MINIX_V2; 274 sbi->s_nzones = ms->s_zones; 275 sbi->s_dirsize = 16; 276 sbi->s_namelen = 14; 277 s->s_max_links = MINIX2_LINK_MAX; 278 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 279 sbi->s_version = MINIX_V2; 280 sbi->s_nzones = ms->s_zones; 281 sbi->s_dirsize = 32; 282 sbi->s_namelen = 30; 283 s->s_max_links = MINIX2_LINK_MAX; 284 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 285 m3s = (struct minix3_super_block *) bh->b_data; 286 s->s_magic = m3s->s_magic; 287 sbi->s_imap_blocks = m3s->s_imap_blocks; 288 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 289 sbi->s_firstdatazone = m3s->s_firstdatazone; 290 sbi->s_log_zone_size = m3s->s_log_zone_size; 291 s->s_maxbytes = m3s->s_max_size; 292 sbi->s_ninodes = m3s->s_ninodes; 293 sbi->s_nzones = m3s->s_zones; 294 sbi->s_dirsize = 64; 295 sbi->s_namelen = 60; 296 sbi->s_version = MINIX_V3; 297 sbi->s_mount_state = MINIX_VALID_FS; 298 if (!sb_set_blocksize(s, m3s->s_blocksize)) 299 goto out_release; 300 s->s_max_links = MINIX2_LINK_MAX; 301 } else 302 goto out_no_fs; 303 304 if (!minix_check_superblock(s)) 305 goto out_illegal_sb; 306 307 /* 308 * Allocate the buffer map to keep the superblock small. 309 */ 310 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 311 map = kzalloc(i, GFP_KERNEL); 312 if (!map) 313 goto out_no_map; 314 sbi->s_imap = &map[0]; 315 sbi->s_zmap = &map[sbi->s_imap_blocks]; 316 317 block=2; 318 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 319 if (!(sbi->s_imap[i]=sb_bread(s, block))) 320 goto out_no_bitmap; 321 block++; 322 } 323 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 324 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 325 goto out_no_bitmap; 326 block++; 327 } 328 329 minix_set_bit(0,sbi->s_imap[0]->b_data); 330 minix_set_bit(0,sbi->s_zmap[0]->b_data); 331 332 /* set up enough so that it can read an inode */ 333 s->s_op = &minix_sops; 334 s->s_time_min = 0; 335 s->s_time_max = U32_MAX; 336 root_inode = minix_iget(s, MINIX_ROOT_INO); 337 if (IS_ERR(root_inode)) { 338 ret = PTR_ERR(root_inode); 339 goto out_no_root; 340 } 341 342 ret = -ENOMEM; 343 s->s_root = d_make_root(root_inode); 344 if (!s->s_root) 345 goto out_no_root; 346 347 if (!sb_rdonly(s)) { 348 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 349 ms->s_state &= ~MINIX_VALID_FS; 350 mark_buffer_dirty(bh); 351 } 352 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 353 printk("MINIX-fs: mounting unchecked file system, " 354 "running fsck is recommended\n"); 355 else if (sbi->s_mount_state & MINIX_ERROR_FS) 356 printk("MINIX-fs: mounting file system with errors, " 357 "running fsck is recommended\n"); 358 359 return 0; 360 361 out_no_root: 362 if (!silent) 363 printk("MINIX-fs: get root inode failed\n"); 364 goto out_freemap; 365 366 out_no_bitmap: 367 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 368 out_freemap: 369 for (i = 0; i < sbi->s_imap_blocks; i++) 370 brelse(sbi->s_imap[i]); 371 for (i = 0; i < sbi->s_zmap_blocks; i++) 372 brelse(sbi->s_zmap[i]); 373 kfree(sbi->s_imap); 374 goto out_release; 375 376 out_no_map: 377 ret = -ENOMEM; 378 if (!silent) 379 printk("MINIX-fs: can't allocate map\n"); 380 goto out_release; 381 382 out_illegal_sb: 383 if (!silent) 384 printk("MINIX-fs: bad superblock\n"); 385 goto out_release; 386 387 out_no_fs: 388 if (!silent) 389 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 390 "on device %s.\n", s->s_id); 391 out_release: 392 brelse(bh); 393 goto out; 394 395 out_bad_hblock: 396 printk("MINIX-fs: blocksize too small for device\n"); 397 goto out; 398 399 out_bad_sb: 400 printk("MINIX-fs: unable to read superblock\n"); 401 out: 402 s->s_fs_info = NULL; 403 kfree(sbi); 404 return ret; 405 } 406 407 static int minix_get_tree(struct fs_context *fc) 408 { 409 return get_tree_bdev(fc, minix_fill_super); 410 } 411 412 static const struct fs_context_operations minix_context_ops = { 413 .get_tree = minix_get_tree, 414 .reconfigure = minix_reconfigure, 415 }; 416 417 static int minix_init_fs_context(struct fs_context *fc) 418 { 419 fc->ops = &minix_context_ops; 420 421 return 0; 422 } 423 424 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 425 { 426 struct super_block *sb = dentry->d_sb; 427 struct minix_sb_info *sbi = minix_sb(sb); 428 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 429 buf->f_type = sb->s_magic; 430 buf->f_bsize = sb->s_blocksize; 431 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 432 buf->f_bfree = minix_count_free_blocks(sb); 433 buf->f_bavail = buf->f_bfree; 434 buf->f_files = sbi->s_ninodes; 435 buf->f_ffree = minix_count_free_inodes(sb); 436 buf->f_namelen = sbi->s_namelen; 437 buf->f_fsid = u64_to_fsid(id); 438 439 return 0; 440 } 441 442 static int minix_get_block(struct inode *inode, sector_t block, 443 struct buffer_head *bh_result, int create) 444 { 445 if (INODE_VERSION(inode) == MINIX_V1) 446 return V1_minix_get_block(inode, block, bh_result, create); 447 else 448 return V2_minix_get_block(inode, block, bh_result, create); 449 } 450 451 static int minix_writepages(struct address_space *mapping, 452 struct writeback_control *wbc) 453 { 454 return mpage_writepages(mapping, wbc, minix_get_block); 455 } 456 457 static int minix_read_folio(struct file *file, struct folio *folio) 458 { 459 return block_read_full_folio(folio, minix_get_block); 460 } 461 462 int minix_prepare_chunk(struct folio *folio, loff_t pos, unsigned len) 463 { 464 return __block_write_begin(folio, pos, len, minix_get_block); 465 } 466 467 static void minix_write_failed(struct address_space *mapping, loff_t to) 468 { 469 struct inode *inode = mapping->host; 470 471 if (to > inode->i_size) { 472 truncate_pagecache(inode, inode->i_size); 473 minix_truncate(inode); 474 } 475 } 476 477 static int minix_write_begin(const struct kiocb *iocb, 478 struct address_space *mapping, 479 loff_t pos, unsigned len, 480 struct folio **foliop, void **fsdata) 481 { 482 int ret; 483 484 ret = block_write_begin(mapping, pos, len, foliop, minix_get_block); 485 if (unlikely(ret)) 486 minix_write_failed(mapping, pos + len); 487 488 return ret; 489 } 490 491 static sector_t minix_bmap(struct address_space *mapping, sector_t block) 492 { 493 return generic_block_bmap(mapping,block,minix_get_block); 494 } 495 496 static const struct address_space_operations minix_aops = { 497 .dirty_folio = block_dirty_folio, 498 .invalidate_folio = block_invalidate_folio, 499 .read_folio = minix_read_folio, 500 .writepages = minix_writepages, 501 .write_begin = minix_write_begin, 502 .write_end = generic_write_end, 503 .migrate_folio = buffer_migrate_folio, 504 .bmap = minix_bmap, 505 .direct_IO = noop_direct_IO 506 }; 507 508 static const struct inode_operations minix_symlink_inode_operations = { 509 .get_link = page_get_link, 510 .getattr = minix_getattr, 511 }; 512 513 void minix_set_inode(struct inode *inode, dev_t rdev) 514 { 515 if (S_ISREG(inode->i_mode)) { 516 inode->i_op = &minix_file_inode_operations; 517 inode->i_fop = &minix_file_operations; 518 inode->i_mapping->a_ops = &minix_aops; 519 } else if (S_ISDIR(inode->i_mode)) { 520 inode->i_op = &minix_dir_inode_operations; 521 inode->i_fop = &minix_dir_operations; 522 inode->i_mapping->a_ops = &minix_aops; 523 } else if (S_ISLNK(inode->i_mode)) { 524 inode->i_op = &minix_symlink_inode_operations; 525 inode_nohighmem(inode); 526 inode->i_mapping->a_ops = &minix_aops; 527 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 528 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 529 init_special_inode(inode, inode->i_mode, rdev); 530 } else { 531 printk(KERN_DEBUG "MINIX-fs: Invalid file type 0%04o for inode %llu.\n", 532 inode->i_mode, inode->i_ino); 533 make_bad_inode(inode); 534 } 535 } 536 537 /* 538 * The minix V1 function to read an inode. 539 */ 540 static struct inode *V1_minix_iget(struct inode *inode) 541 { 542 struct buffer_head * bh; 543 struct minix_inode * raw_inode; 544 struct minix_inode_info *minix_inode = minix_i(inode); 545 int i; 546 547 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 548 if (!raw_inode) { 549 iget_failed(inode); 550 return ERR_PTR(-EIO); 551 } 552 if (raw_inode->i_nlinks == 0) { 553 printk("MINIX-fs: deleted inode referenced: %llu\n", 554 inode->i_ino); 555 brelse(bh); 556 iget_failed(inode); 557 return ERR_PTR(-ESTALE); 558 } 559 inode->i_mode = raw_inode->i_mode; 560 i_uid_write(inode, raw_inode->i_uid); 561 i_gid_write(inode, raw_inode->i_gid); 562 set_nlink(inode, raw_inode->i_nlinks); 563 inode->i_size = raw_inode->i_size; 564 inode_set_mtime_to_ts(inode, 565 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0))); 566 inode->i_blocks = 0; 567 for (i = 0; i < 9; i++) 568 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 569 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 570 brelse(bh); 571 unlock_new_inode(inode); 572 return inode; 573 } 574 575 /* 576 * The minix V2 function to read an inode. 577 */ 578 static struct inode *V2_minix_iget(struct inode *inode) 579 { 580 struct buffer_head * bh; 581 struct minix2_inode * raw_inode; 582 struct minix_inode_info *minix_inode = minix_i(inode); 583 int i; 584 585 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 586 if (!raw_inode) { 587 iget_failed(inode); 588 return ERR_PTR(-EIO); 589 } 590 if (raw_inode->i_nlinks == 0) { 591 printk("MINIX-fs: deleted inode referenced: %llu\n", 592 inode->i_ino); 593 brelse(bh); 594 iget_failed(inode); 595 return ERR_PTR(-ESTALE); 596 } 597 inode->i_mode = raw_inode->i_mode; 598 i_uid_write(inode, raw_inode->i_uid); 599 i_gid_write(inode, raw_inode->i_gid); 600 set_nlink(inode, raw_inode->i_nlinks); 601 inode->i_size = raw_inode->i_size; 602 inode_set_mtime(inode, raw_inode->i_mtime, 0); 603 inode_set_atime(inode, raw_inode->i_atime, 0); 604 inode_set_ctime(inode, raw_inode->i_ctime, 0); 605 inode->i_blocks = 0; 606 for (i = 0; i < 10; i++) 607 minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; 608 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 609 brelse(bh); 610 unlock_new_inode(inode); 611 return inode; 612 } 613 614 /* 615 * The global function to read an inode. 616 */ 617 struct inode *minix_iget(struct super_block *sb, unsigned long ino) 618 { 619 struct inode *inode; 620 621 inode = iget_locked(sb, ino); 622 if (!inode) 623 return ERR_PTR(-ENOMEM); 624 if (!(inode_state_read_once(inode) & I_NEW)) 625 return inode; 626 627 if (INODE_VERSION(inode) == MINIX_V1) 628 return V1_minix_iget(inode); 629 else 630 return V2_minix_iget(inode); 631 } 632 633 /* 634 * The minix V1 function to synchronize an inode. 635 */ 636 static int V1_minix_update_inode(struct inode * inode) 637 { 638 struct buffer_head * bh; 639 struct minix_inode * raw_inode; 640 struct minix_inode_info *minix_inode = minix_i(inode); 641 int i; 642 643 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 644 if (!raw_inode) 645 return -EIO; 646 raw_inode->i_mode = inode->i_mode; 647 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 648 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 649 raw_inode->i_nlinks = inode->i_nlink; 650 raw_inode->i_size = inode->i_size; 651 raw_inode->i_time = inode_get_mtime_sec(inode); 652 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 653 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 654 else for (i = 0; i < 9; i++) 655 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 656 mark_buffer_dirty(bh); 657 brelse(bh); 658 set_inode_metadata_writeback(inode); 659 return 0; 660 } 661 662 /* 663 * The minix V2 function to synchronize an inode. 664 */ 665 static int V2_minix_update_inode(struct inode * inode) 666 { 667 struct buffer_head * bh; 668 struct minix2_inode * raw_inode; 669 struct minix_inode_info *minix_inode = minix_i(inode); 670 int i; 671 672 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 673 if (!raw_inode) 674 return -EIO; 675 raw_inode->i_mode = inode->i_mode; 676 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 677 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 678 raw_inode->i_nlinks = inode->i_nlink; 679 raw_inode->i_size = inode->i_size; 680 raw_inode->i_mtime = inode_get_mtime_sec(inode); 681 raw_inode->i_atime = inode_get_atime_sec(inode); 682 raw_inode->i_ctime = inode_get_ctime_sec(inode); 683 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 684 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 685 else for (i = 0; i < 10; i++) 686 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 687 mark_buffer_dirty(bh); 688 brelse(bh); 689 set_inode_metadata_writeback(inode); 690 return 0; 691 } 692 693 static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 694 { 695 if (INODE_VERSION(inode) == MINIX_V1) 696 return V1_minix_update_inode(inode); 697 return V2_minix_update_inode(inode); 698 } 699 700 static int minix_sync_inode_metadata(struct inode *inode, 701 struct writeback_control *wbc) 702 { 703 int err = 0; 704 struct buffer_head *bh; 705 void *raw_inode; 706 707 if (INODE_VERSION(inode) == MINIX_V1) 708 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 709 else 710 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 711 if (!raw_inode) 712 return -EIO; 713 err = mmb_sync(&minix_i(inode)->i_metadata_bhs); 714 if (err) 715 goto out; 716 sync_dirty_buffer(bh); 717 if (buffer_write_io_error(bh)) { 718 printk("IO error syncing minix inode [%s:%08llx]\n", 719 inode->i_sb->s_id, inode->i_ino); 720 err = -EIO; 721 } 722 out: 723 brelse(bh); 724 return err; 725 } 726 727 int minix_getattr(struct mnt_idmap *idmap, const struct path *path, 728 struct kstat *stat, u32 request_mask, unsigned int flags) 729 { 730 struct super_block *sb = path->dentry->d_sb; 731 struct inode *inode = d_inode(path->dentry); 732 733 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 734 if (INODE_VERSION(inode) == MINIX_V1) 735 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 736 else 737 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 738 stat->blksize = sb->s_blocksize; 739 return 0; 740 } 741 742 /* 743 * The function that is called for file truncation. 744 */ 745 void minix_truncate(struct inode * inode) 746 { 747 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 748 return; 749 if (INODE_VERSION(inode) == MINIX_V1) 750 V1_minix_truncate(inode); 751 else 752 V2_minix_truncate(inode); 753 } 754 755 static struct file_system_type minix_fs_type = { 756 .owner = THIS_MODULE, 757 .name = "minix", 758 .kill_sb = kill_block_super, 759 .fs_flags = FS_REQUIRES_DEV, 760 .init_fs_context = minix_init_fs_context, 761 }; 762 MODULE_ALIAS_FS("minix"); 763 764 static int __init init_minix_fs(void) 765 { 766 int err = init_inodecache(); 767 if (err) 768 goto out1; 769 err = register_filesystem(&minix_fs_type); 770 if (err) 771 goto out; 772 return 0; 773 out: 774 destroy_inodecache(); 775 out1: 776 return err; 777 } 778 779 static void __exit exit_minix_fs(void) 780 { 781 unregister_filesystem(&minix_fs_type); 782 destroy_inodecache(); 783 } 784 785 module_init(init_minix_fs) 786 module_exit(exit_minix_fs) 787 MODULE_DESCRIPTION("Minix file system"); 788 MODULE_LICENSE("GPL"); 789 790