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