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 25static int minix_write_inode(struct inode *inode, 26 struct writeback_control *wbc); 27static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); 28 29static 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 42static 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 62static struct kmem_cache * minix_inode_cachep; 63 64static 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 73static void minix_free_in_core_inode(struct inode *inode) 74{ 75 kmem_cache_free(minix_inode_cachep, minix_i(inode)); 76} 77 78static 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 85static 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_ACCOUNT), 91 init_once); 92 if (minix_inode_cachep == NULL) 93 return -ENOMEM; 94 return 0; 95} 96 97static 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 107static 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}; 115 116static int minix_reconfigure(struct fs_context *fc) 117{ 118 struct minix_super_block * ms; 119 struct super_block *sb = fc->root->d_sb; 120 struct minix_sb_info * sbi = sb->s_fs_info; 121 122 sync_filesystem(sb); 123 ms = sbi->s_ms; 124 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 125 return 0; 126 if (fc->sb_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 154static 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 173static int minix_fill_super(struct super_block *s, struct fs_context *fc) 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 int silent = fc->sb_flags & SB_SILENT; 184 185 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); 186 if (!sbi) 187 return -ENOMEM; 188 s->s_fs_info = sbi; 189 190 BUILD_BUG_ON(32 != sizeof (struct minix_inode)); 191 BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); 192 193 if (!sb_set_blocksize(s, BLOCK_SIZE)) 194 goto out_bad_hblock; 195 196 if (!(bh = sb_bread(s, 1))) 197 goto out_bad_sb; 198 199 ms = (struct minix_super_block *) bh->b_data; 200 sbi->s_ms = ms; 201 sbi->s_sbh = bh; 202 sbi->s_mount_state = ms->s_state; 203 sbi->s_ninodes = ms->s_ninodes; 204 sbi->s_nzones = ms->s_nzones; 205 sbi->s_imap_blocks = ms->s_imap_blocks; 206 sbi->s_zmap_blocks = ms->s_zmap_blocks; 207 sbi->s_firstdatazone = ms->s_firstdatazone; 208 sbi->s_log_zone_size = ms->s_log_zone_size; 209 s->s_maxbytes = ms->s_max_size; 210 s->s_magic = ms->s_magic; 211 if (s->s_magic == MINIX_SUPER_MAGIC) { 212 sbi->s_version = MINIX_V1; 213 sbi->s_dirsize = 16; 214 sbi->s_namelen = 14; 215 s->s_max_links = MINIX_LINK_MAX; 216 } else if (s->s_magic == MINIX_SUPER_MAGIC2) { 217 sbi->s_version = MINIX_V1; 218 sbi->s_dirsize = 32; 219 sbi->s_namelen = 30; 220 s->s_max_links = MINIX_LINK_MAX; 221 } else if (s->s_magic == MINIX2_SUPER_MAGIC) { 222 sbi->s_version = MINIX_V2; 223 sbi->s_nzones = ms->s_zones; 224 sbi->s_dirsize = 16; 225 sbi->s_namelen = 14; 226 s->s_max_links = MINIX2_LINK_MAX; 227 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { 228 sbi->s_version = MINIX_V2; 229 sbi->s_nzones = ms->s_zones; 230 sbi->s_dirsize = 32; 231 sbi->s_namelen = 30; 232 s->s_max_links = MINIX2_LINK_MAX; 233 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { 234 m3s = (struct minix3_super_block *) bh->b_data; 235 s->s_magic = m3s->s_magic; 236 sbi->s_imap_blocks = m3s->s_imap_blocks; 237 sbi->s_zmap_blocks = m3s->s_zmap_blocks; 238 sbi->s_firstdatazone = m3s->s_firstdatazone; 239 sbi->s_log_zone_size = m3s->s_log_zone_size; 240 s->s_maxbytes = m3s->s_max_size; 241 sbi->s_ninodes = m3s->s_ninodes; 242 sbi->s_nzones = m3s->s_zones; 243 sbi->s_dirsize = 64; 244 sbi->s_namelen = 60; 245 sbi->s_version = MINIX_V3; 246 sbi->s_mount_state = MINIX_VALID_FS; 247 sb_set_blocksize(s, m3s->s_blocksize); 248 s->s_max_links = MINIX2_LINK_MAX; 249 } else 250 goto out_no_fs; 251 252 if (!minix_check_superblock(s)) 253 goto out_illegal_sb; 254 255 /* 256 * Allocate the buffer map to keep the superblock small. 257 */ 258 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); 259 map = kzalloc(i, GFP_KERNEL); 260 if (!map) 261 goto out_no_map; 262 sbi->s_imap = &map[0]; 263 sbi->s_zmap = &map[sbi->s_imap_blocks]; 264 265 block=2; 266 for (i=0 ; i < sbi->s_imap_blocks ; i++) { 267 if (!(sbi->s_imap[i]=sb_bread(s, block))) 268 goto out_no_bitmap; 269 block++; 270 } 271 for (i=0 ; i < sbi->s_zmap_blocks ; i++) { 272 if (!(sbi->s_zmap[i]=sb_bread(s, block))) 273 goto out_no_bitmap; 274 block++; 275 } 276 277 minix_set_bit(0,sbi->s_imap[0]->b_data); 278 minix_set_bit(0,sbi->s_zmap[0]->b_data); 279 280 /* Apparently minix can create filesystems that allocate more blocks for 281 * the bitmaps than needed. We simply ignore that, but verify it didn't 282 * create one with not enough blocks and bail out if so. 283 */ 284 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); 285 if (sbi->s_imap_blocks < block) { 286 printk("MINIX-fs: file system does not have enough " 287 "imap blocks allocated. Refusing to mount.\n"); 288 goto out_no_bitmap; 289 } 290 291 block = minix_blocks_needed( 292 (sbi->s_nzones - sbi->s_firstdatazone + 1), 293 s->s_blocksize); 294 if (sbi->s_zmap_blocks < block) { 295 printk("MINIX-fs: file system does not have enough " 296 "zmap blocks allocated. Refusing to mount.\n"); 297 goto out_no_bitmap; 298 } 299 300 /* set up enough so that it can read an inode */ 301 s->s_op = &minix_sops; 302 s->s_time_min = 0; 303 s->s_time_max = U32_MAX; 304 root_inode = minix_iget(s, MINIX_ROOT_INO); 305 if (IS_ERR(root_inode)) { 306 ret = PTR_ERR(root_inode); 307 goto out_no_root; 308 } 309 310 ret = -ENOMEM; 311 s->s_root = d_make_root(root_inode); 312 if (!s->s_root) 313 goto out_no_root; 314 315 if (!sb_rdonly(s)) { 316 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ 317 ms->s_state &= ~MINIX_VALID_FS; 318 mark_buffer_dirty(bh); 319 } 320 if (!(sbi->s_mount_state & MINIX_VALID_FS)) 321 printk("MINIX-fs: mounting unchecked file system, " 322 "running fsck is recommended\n"); 323 else if (sbi->s_mount_state & MINIX_ERROR_FS) 324 printk("MINIX-fs: mounting file system with errors, " 325 "running fsck is recommended\n"); 326 327 return 0; 328 329out_no_root: 330 if (!silent) 331 printk("MINIX-fs: get root inode failed\n"); 332 goto out_freemap; 333 334out_no_bitmap: 335 printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); 336out_freemap: 337 for (i = 0; i < sbi->s_imap_blocks; i++) 338 brelse(sbi->s_imap[i]); 339 for (i = 0; i < sbi->s_zmap_blocks; i++) 340 brelse(sbi->s_zmap[i]); 341 kfree(sbi->s_imap); 342 goto out_release; 343 344out_no_map: 345 ret = -ENOMEM; 346 if (!silent) 347 printk("MINIX-fs: can't allocate map\n"); 348 goto out_release; 349 350out_illegal_sb: 351 if (!silent) 352 printk("MINIX-fs: bad superblock\n"); 353 goto out_release; 354 355out_no_fs: 356 if (!silent) 357 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " 358 "on device %s.\n", s->s_id); 359out_release: 360 brelse(bh); 361 goto out; 362 363out_bad_hblock: 364 printk("MINIX-fs: blocksize too small for device\n"); 365 goto out; 366 367out_bad_sb: 368 printk("MINIX-fs: unable to read superblock\n"); 369out: 370 s->s_fs_info = NULL; 371 kfree(sbi); 372 return ret; 373} 374 375static int minix_get_tree(struct fs_context *fc) 376{ 377 return get_tree_bdev(fc, minix_fill_super); 378} 379 380static const struct fs_context_operations minix_context_ops = { 381 .get_tree = minix_get_tree, 382 .reconfigure = minix_reconfigure, 383}; 384 385static int minix_init_fs_context(struct fs_context *fc) 386{ 387 fc->ops = &minix_context_ops; 388 389 return 0; 390} 391 392static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) 393{ 394 struct super_block *sb = dentry->d_sb; 395 struct minix_sb_info *sbi = minix_sb(sb); 396 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 397 buf->f_type = sb->s_magic; 398 buf->f_bsize = sb->s_blocksize; 399 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; 400 buf->f_bfree = minix_count_free_blocks(sb); 401 buf->f_bavail = buf->f_bfree; 402 buf->f_files = sbi->s_ninodes; 403 buf->f_ffree = minix_count_free_inodes(sb); 404 buf->f_namelen = sbi->s_namelen; 405 buf->f_fsid = u64_to_fsid(id); 406 407 return 0; 408} 409 410static int minix_get_block(struct inode *inode, sector_t block, 411 struct buffer_head *bh_result, int create) 412{ 413 if (INODE_VERSION(inode) == MINIX_V1) 414 return V1_minix_get_block(inode, block, bh_result, create); 415 else 416 return V2_minix_get_block(inode, block, bh_result, create); 417} 418 419static int minix_writepages(struct address_space *mapping, 420 struct writeback_control *wbc) 421{ 422 return mpage_writepages(mapping, wbc, minix_get_block); 423} 424 425static int minix_read_folio(struct file *file, struct folio *folio) 426{ 427 return block_read_full_folio(folio, minix_get_block); 428} 429 430int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) 431{ 432 return __block_write_begin(page, pos, len, minix_get_block); 433} 434 435static void minix_write_failed(struct address_space *mapping, loff_t to) 436{ 437 struct inode *inode = mapping->host; 438 439 if (to > inode->i_size) { 440 truncate_pagecache(inode, inode->i_size); 441 minix_truncate(inode); 442 } 443} 444 445static int minix_write_begin(struct file *file, struct address_space *mapping, 446 loff_t pos, unsigned len, 447 struct page **pagep, void **fsdata) 448{ 449 int ret; 450 451 ret = block_write_begin(mapping, pos, len, pagep, minix_get_block); 452 if (unlikely(ret)) 453 minix_write_failed(mapping, pos + len); 454 455 return ret; 456} 457 458static sector_t minix_bmap(struct address_space *mapping, sector_t block) 459{ 460 return generic_block_bmap(mapping,block,minix_get_block); 461} 462 463static const struct address_space_operations minix_aops = { 464 .dirty_folio = block_dirty_folio, 465 .invalidate_folio = block_invalidate_folio, 466 .read_folio = minix_read_folio, 467 .writepages = minix_writepages, 468 .write_begin = minix_write_begin, 469 .write_end = generic_write_end, 470 .migrate_folio = buffer_migrate_folio, 471 .bmap = minix_bmap, 472 .direct_IO = noop_direct_IO 473}; 474 475static const struct inode_operations minix_symlink_inode_operations = { 476 .get_link = page_get_link, 477 .getattr = minix_getattr, 478}; 479 480void minix_set_inode(struct inode *inode, dev_t rdev) 481{ 482 if (S_ISREG(inode->i_mode)) { 483 inode->i_op = &minix_file_inode_operations; 484 inode->i_fop = &minix_file_operations; 485 inode->i_mapping->a_ops = &minix_aops; 486 } else if (S_ISDIR(inode->i_mode)) { 487 inode->i_op = &minix_dir_inode_operations; 488 inode->i_fop = &minix_dir_operations; 489 inode->i_mapping->a_ops = &minix_aops; 490 } else if (S_ISLNK(inode->i_mode)) { 491 inode->i_op = &minix_symlink_inode_operations; 492 inode_nohighmem(inode); 493 inode->i_mapping->a_ops = &minix_aops; 494 } else 495 init_special_inode(inode, inode->i_mode, rdev); 496} 497 498/* 499 * The minix V1 function to read an inode. 500 */ 501static struct inode *V1_minix_iget(struct inode *inode) 502{ 503 struct buffer_head * bh; 504 struct minix_inode * raw_inode; 505 struct minix_inode_info *minix_inode = minix_i(inode); 506 int i; 507 508 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 509 if (!raw_inode) { 510 iget_failed(inode); 511 return ERR_PTR(-EIO); 512 } 513 if (raw_inode->i_nlinks == 0) { 514 printk("MINIX-fs: deleted inode referenced: %lu\n", 515 inode->i_ino); 516 brelse(bh); 517 iget_failed(inode); 518 return ERR_PTR(-ESTALE); 519 } 520 inode->i_mode = raw_inode->i_mode; 521 i_uid_write(inode, raw_inode->i_uid); 522 i_gid_write(inode, raw_inode->i_gid); 523 set_nlink(inode, raw_inode->i_nlinks); 524 inode->i_size = raw_inode->i_size; 525 inode_set_mtime_to_ts(inode, 526 inode_set_atime_to_ts(inode, inode_set_ctime(inode, raw_inode->i_time, 0))); 527 inode->i_blocks = 0; 528 for (i = 0; i < 9; i++) 529 minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; 530 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); 531 brelse(bh); 532 unlock_new_inode(inode); 533 return inode; 534} 535 536/* 537 * The minix V2 function to read an inode. 538 */ 539static struct inode *V2_minix_iget(struct inode *inode) 540{ 541 struct buffer_head * bh; 542 struct minix2_inode * raw_inode; 543 struct minix_inode_info *minix_inode = minix_i(inode); 544 int i; 545 546 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 547 if (!raw_inode) { 548 iget_failed(inode); 549 return ERR_PTR(-EIO); 550 } 551 if (raw_inode->i_nlinks == 0) { 552 printk("MINIX-fs: deleted inode referenced: %lu\n", 553 inode->i_ino); 554 brelse(bh); 555 iget_failed(inode); 556 return ERR_PTR(-ESTALE); 557 } 558 inode->i_mode = raw_inode->i_mode; 559 i_uid_write(inode, raw_inode->i_uid); 560 i_gid_write(inode, raw_inode->i_gid); 561 set_nlink(inode, raw_inode->i_nlinks); 562 inode->i_size = raw_inode->i_size; 563 inode_set_mtime(inode, raw_inode->i_mtime, 0); 564 inode_set_atime(inode, raw_inode->i_atime, 0); 565 inode_set_ctime(inode, raw_inode->i_ctime, 0); 566 inode->i_blocks = 0; 567 for (i = 0; i < 10; i++) 568 minix_inode->u.i2_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 global function to read an inode. 577 */ 578struct inode *minix_iget(struct super_block *sb, unsigned long ino) 579{ 580 struct inode *inode; 581 582 inode = iget_locked(sb, ino); 583 if (!inode) 584 return ERR_PTR(-ENOMEM); 585 if (!(inode->i_state & I_NEW)) 586 return inode; 587 588 if (INODE_VERSION(inode) == MINIX_V1) 589 return V1_minix_iget(inode); 590 else 591 return V2_minix_iget(inode); 592} 593 594/* 595 * The minix V1 function to synchronize an inode. 596 */ 597static struct buffer_head * V1_minix_update_inode(struct inode * inode) 598{ 599 struct buffer_head * bh; 600 struct minix_inode * raw_inode; 601 struct minix_inode_info *minix_inode = minix_i(inode); 602 int i; 603 604 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); 605 if (!raw_inode) 606 return NULL; 607 raw_inode->i_mode = inode->i_mode; 608 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 609 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 610 raw_inode->i_nlinks = inode->i_nlink; 611 raw_inode->i_size = inode->i_size; 612 raw_inode->i_time = inode_get_mtime_sec(inode); 613 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 614 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 615 else for (i = 0; i < 9; i++) 616 raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; 617 mark_buffer_dirty(bh); 618 return bh; 619} 620 621/* 622 * The minix V2 function to synchronize an inode. 623 */ 624static struct buffer_head * V2_minix_update_inode(struct inode * inode) 625{ 626 struct buffer_head * bh; 627 struct minix2_inode * raw_inode; 628 struct minix_inode_info *minix_inode = minix_i(inode); 629 int i; 630 631 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); 632 if (!raw_inode) 633 return NULL; 634 raw_inode->i_mode = inode->i_mode; 635 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); 636 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); 637 raw_inode->i_nlinks = inode->i_nlink; 638 raw_inode->i_size = inode->i_size; 639 raw_inode->i_mtime = inode_get_mtime_sec(inode); 640 raw_inode->i_atime = inode_get_atime_sec(inode); 641 raw_inode->i_ctime = inode_get_ctime_sec(inode); 642 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 643 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); 644 else for (i = 0; i < 10; i++) 645 raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; 646 mark_buffer_dirty(bh); 647 return bh; 648} 649 650static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) 651{ 652 int err = 0; 653 struct buffer_head *bh; 654 655 if (INODE_VERSION(inode) == MINIX_V1) 656 bh = V1_minix_update_inode(inode); 657 else 658 bh = V2_minix_update_inode(inode); 659 if (!bh) 660 return -EIO; 661 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { 662 sync_dirty_buffer(bh); 663 if (buffer_req(bh) && !buffer_uptodate(bh)) { 664 printk("IO error syncing minix inode [%s:%08lx]\n", 665 inode->i_sb->s_id, inode->i_ino); 666 err = -EIO; 667 } 668 } 669 brelse (bh); 670 return err; 671} 672 673int minix_getattr(struct mnt_idmap *idmap, const struct path *path, 674 struct kstat *stat, u32 request_mask, unsigned int flags) 675{ 676 struct super_block *sb = path->dentry->d_sb; 677 struct inode *inode = d_inode(path->dentry); 678 679 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 680 if (INODE_VERSION(inode) == MINIX_V1) 681 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); 682 else 683 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); 684 stat->blksize = sb->s_blocksize; 685 return 0; 686} 687 688/* 689 * The function that is called for file truncation. 690 */ 691void minix_truncate(struct inode * inode) 692{ 693 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 694 return; 695 if (INODE_VERSION(inode) == MINIX_V1) 696 V1_minix_truncate(inode); 697 else 698 V2_minix_truncate(inode); 699} 700 701static struct file_system_type minix_fs_type = { 702 .owner = THIS_MODULE, 703 .name = "minix", 704 .kill_sb = kill_block_super, 705 .fs_flags = FS_REQUIRES_DEV, 706 .init_fs_context = minix_init_fs_context, 707}; 708MODULE_ALIAS_FS("minix"); 709 710static int __init init_minix_fs(void) 711{ 712 int err = init_inodecache(); 713 if (err) 714 goto out1; 715 err = register_filesystem(&minix_fs_type); 716 if (err) 717 goto out; 718 return 0; 719out: 720 destroy_inodecache(); 721out1: 722 return err; 723} 724 725static void __exit exit_minix_fs(void) 726{ 727 unregister_filesystem(&minix_fs_type); 728 destroy_inodecache(); 729} 730 731module_init(init_minix_fs) 732module_exit(exit_minix_fs) 733MODULE_LICENSE("GPL"); 734 735