Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
| 2 | * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project. |
| 3 | * |
Anton Altaparmakov | c002f42 | 2005-02-03 12:02:56 +0000 | [diff] [blame] | 4 | * Copyright (c) 2001-2005 Anton Altaparmakov |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program/include file is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as published |
| 8 | * by the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program/include file is distributed in the hope that it will be |
| 12 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program (in the main directory of the Linux-NTFS |
| 18 | * distribution in the file COPYING); if not, write to the Free Software |
| 19 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/buffer_head.h> |
| 24 | #include <linux/smp_lock.h> |
| 25 | #include <linux/quotaops.h> |
| 26 | #include <linux/mount.h> |
| 27 | |
| 28 | #include "aops.h" |
| 29 | #include "dir.h" |
| 30 | #include "debug.h" |
| 31 | #include "inode.h" |
| 32 | #include "attrib.h" |
| 33 | #include "malloc.h" |
| 34 | #include "mft.h" |
| 35 | #include "time.h" |
| 36 | #include "ntfs.h" |
| 37 | |
| 38 | /** |
| 39 | * ntfs_test_inode - compare two (possibly fake) inodes for equality |
| 40 | * @vi: vfs inode which to test |
| 41 | * @na: ntfs attribute which is being tested with |
| 42 | * |
| 43 | * Compare the ntfs attribute embedded in the ntfs specific part of the vfs |
| 44 | * inode @vi for equality with the ntfs attribute @na. |
| 45 | * |
| 46 | * If searching for the normal file/directory inode, set @na->type to AT_UNUSED. |
| 47 | * @na->name and @na->name_len are then ignored. |
| 48 | * |
| 49 | * Return 1 if the attributes match and 0 if not. |
| 50 | * |
| 51 | * NOTE: This function runs with the inode_lock spin lock held so it is not |
| 52 | * allowed to sleep. |
| 53 | */ |
| 54 | int ntfs_test_inode(struct inode *vi, ntfs_attr *na) |
| 55 | { |
| 56 | ntfs_inode *ni; |
| 57 | |
| 58 | if (vi->i_ino != na->mft_no) |
| 59 | return 0; |
| 60 | ni = NTFS_I(vi); |
| 61 | /* If !NInoAttr(ni), @vi is a normal file or directory inode. */ |
| 62 | if (likely(!NInoAttr(ni))) { |
| 63 | /* If not looking for a normal inode this is a mismatch. */ |
| 64 | if (unlikely(na->type != AT_UNUSED)) |
| 65 | return 0; |
| 66 | } else { |
| 67 | /* A fake inode describing an attribute. */ |
| 68 | if (ni->type != na->type) |
| 69 | return 0; |
| 70 | if (ni->name_len != na->name_len) |
| 71 | return 0; |
| 72 | if (na->name_len && memcmp(ni->name, na->name, |
| 73 | na->name_len * sizeof(ntfschar))) |
| 74 | return 0; |
| 75 | } |
| 76 | /* Match! */ |
| 77 | return 1; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * ntfs_init_locked_inode - initialize an inode |
| 82 | * @vi: vfs inode to initialize |
| 83 | * @na: ntfs attribute which to initialize @vi to |
| 84 | * |
| 85 | * Initialize the vfs inode @vi with the values from the ntfs attribute @na in |
| 86 | * order to enable ntfs_test_inode() to do its work. |
| 87 | * |
| 88 | * If initializing the normal file/directory inode, set @na->type to AT_UNUSED. |
| 89 | * In that case, @na->name and @na->name_len should be set to NULL and 0, |
| 90 | * respectively. Although that is not strictly necessary as |
| 91 | * ntfs_read_inode_locked() will fill them in later. |
| 92 | * |
| 93 | * Return 0 on success and -errno on error. |
| 94 | * |
| 95 | * NOTE: This function runs with the inode_lock spin lock held so it is not |
| 96 | * allowed to sleep. (Hence the GFP_ATOMIC allocation.) |
| 97 | */ |
| 98 | static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na) |
| 99 | { |
| 100 | ntfs_inode *ni = NTFS_I(vi); |
| 101 | |
| 102 | vi->i_ino = na->mft_no; |
| 103 | |
| 104 | ni->type = na->type; |
| 105 | if (na->type == AT_INDEX_ALLOCATION) |
| 106 | NInoSetMstProtected(ni); |
| 107 | |
| 108 | ni->name = na->name; |
| 109 | ni->name_len = na->name_len; |
| 110 | |
| 111 | /* If initializing a normal inode, we are done. */ |
| 112 | if (likely(na->type == AT_UNUSED)) { |
| 113 | BUG_ON(na->name); |
| 114 | BUG_ON(na->name_len); |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | /* It is a fake inode. */ |
| 119 | NInoSetAttr(ni); |
| 120 | |
| 121 | /* |
| 122 | * We have I30 global constant as an optimization as it is the name |
| 123 | * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC |
| 124 | * allocation but that is ok. And most attributes are unnamed anyway, |
| 125 | * thus the fraction of named attributes with name != I30 is actually |
| 126 | * absolutely tiny. |
| 127 | */ |
| 128 | if (na->name_len && na->name != I30) { |
| 129 | unsigned int i; |
| 130 | |
| 131 | BUG_ON(!na->name); |
| 132 | i = na->name_len * sizeof(ntfschar); |
| 133 | ni->name = (ntfschar*)kmalloc(i + sizeof(ntfschar), GFP_ATOMIC); |
| 134 | if (!ni->name) |
| 135 | return -ENOMEM; |
| 136 | memcpy(ni->name, na->name, i); |
| 137 | ni->name[i] = 0; |
| 138 | } |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | typedef int (*set_t)(struct inode *, void *); |
| 143 | static int ntfs_read_locked_inode(struct inode *vi); |
| 144 | static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi); |
| 145 | static int ntfs_read_locked_index_inode(struct inode *base_vi, |
| 146 | struct inode *vi); |
| 147 | |
| 148 | /** |
| 149 | * ntfs_iget - obtain a struct inode corresponding to a specific normal inode |
| 150 | * @sb: super block of mounted volume |
| 151 | * @mft_no: mft record number / inode number to obtain |
| 152 | * |
| 153 | * Obtain the struct inode corresponding to a specific normal inode (i.e. a |
| 154 | * file or directory). |
| 155 | * |
| 156 | * If the inode is in the cache, it is just returned with an increased |
| 157 | * reference count. Otherwise, a new struct inode is allocated and initialized, |
| 158 | * and finally ntfs_read_locked_inode() is called to read in the inode and |
| 159 | * fill in the remainder of the inode structure. |
| 160 | * |
| 161 | * Return the struct inode on success. Check the return value with IS_ERR() and |
| 162 | * if true, the function failed and the error code is obtained from PTR_ERR(). |
| 163 | */ |
| 164 | struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no) |
| 165 | { |
| 166 | struct inode *vi; |
| 167 | ntfs_attr na; |
| 168 | int err; |
| 169 | |
| 170 | na.mft_no = mft_no; |
| 171 | na.type = AT_UNUSED; |
| 172 | na.name = NULL; |
| 173 | na.name_len = 0; |
| 174 | |
| 175 | vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode, |
| 176 | (set_t)ntfs_init_locked_inode, &na); |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 177 | if (unlikely(!vi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | return ERR_PTR(-ENOMEM); |
| 179 | |
| 180 | err = 0; |
| 181 | |
| 182 | /* If this is a freshly allocated inode, need to read it now. */ |
| 183 | if (vi->i_state & I_NEW) { |
| 184 | err = ntfs_read_locked_inode(vi); |
| 185 | unlock_new_inode(vi); |
| 186 | } |
| 187 | /* |
| 188 | * There is no point in keeping bad inodes around if the failure was |
| 189 | * due to ENOMEM. We want to be able to retry again later. |
| 190 | */ |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 191 | if (unlikely(err == -ENOMEM)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | iput(vi); |
| 193 | vi = ERR_PTR(err); |
| 194 | } |
| 195 | return vi; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * ntfs_attr_iget - obtain a struct inode corresponding to an attribute |
| 200 | * @base_vi: vfs base inode containing the attribute |
| 201 | * @type: attribute type |
| 202 | * @name: Unicode name of the attribute (NULL if unnamed) |
| 203 | * @name_len: length of @name in Unicode characters (0 if unnamed) |
| 204 | * |
| 205 | * Obtain the (fake) struct inode corresponding to the attribute specified by |
| 206 | * @type, @name, and @name_len, which is present in the base mft record |
| 207 | * specified by the vfs inode @base_vi. |
| 208 | * |
| 209 | * If the attribute inode is in the cache, it is just returned with an |
| 210 | * increased reference count. Otherwise, a new struct inode is allocated and |
| 211 | * initialized, and finally ntfs_read_locked_attr_inode() is called to read the |
| 212 | * attribute and fill in the inode structure. |
| 213 | * |
| 214 | * Note, for index allocation attributes, you need to use ntfs_index_iget() |
| 215 | * instead of ntfs_attr_iget() as working with indices is a lot more complex. |
| 216 | * |
| 217 | * Return the struct inode of the attribute inode on success. Check the return |
| 218 | * value with IS_ERR() and if true, the function failed and the error code is |
| 219 | * obtained from PTR_ERR(). |
| 220 | */ |
| 221 | struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type, |
| 222 | ntfschar *name, u32 name_len) |
| 223 | { |
| 224 | struct inode *vi; |
| 225 | ntfs_attr na; |
| 226 | int err; |
| 227 | |
| 228 | /* Make sure no one calls ntfs_attr_iget() for indices. */ |
| 229 | BUG_ON(type == AT_INDEX_ALLOCATION); |
| 230 | |
| 231 | na.mft_no = base_vi->i_ino; |
| 232 | na.type = type; |
| 233 | na.name = name; |
| 234 | na.name_len = name_len; |
| 235 | |
| 236 | vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode, |
| 237 | (set_t)ntfs_init_locked_inode, &na); |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 238 | if (unlikely(!vi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | return ERR_PTR(-ENOMEM); |
| 240 | |
| 241 | err = 0; |
| 242 | |
| 243 | /* If this is a freshly allocated inode, need to read it now. */ |
| 244 | if (vi->i_state & I_NEW) { |
| 245 | err = ntfs_read_locked_attr_inode(base_vi, vi); |
| 246 | unlock_new_inode(vi); |
| 247 | } |
| 248 | /* |
| 249 | * There is no point in keeping bad attribute inodes around. This also |
| 250 | * simplifies things in that we never need to check for bad attribute |
| 251 | * inodes elsewhere. |
| 252 | */ |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 253 | if (unlikely(err)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | iput(vi); |
| 255 | vi = ERR_PTR(err); |
| 256 | } |
| 257 | return vi; |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * ntfs_index_iget - obtain a struct inode corresponding to an index |
| 262 | * @base_vi: vfs base inode containing the index related attributes |
| 263 | * @name: Unicode name of the index |
| 264 | * @name_len: length of @name in Unicode characters |
| 265 | * |
| 266 | * Obtain the (fake) struct inode corresponding to the index specified by @name |
| 267 | * and @name_len, which is present in the base mft record specified by the vfs |
| 268 | * inode @base_vi. |
| 269 | * |
| 270 | * If the index inode is in the cache, it is just returned with an increased |
| 271 | * reference count. Otherwise, a new struct inode is allocated and |
| 272 | * initialized, and finally ntfs_read_locked_index_inode() is called to read |
| 273 | * the index related attributes and fill in the inode structure. |
| 274 | * |
| 275 | * Return the struct inode of the index inode on success. Check the return |
| 276 | * value with IS_ERR() and if true, the function failed and the error code is |
| 277 | * obtained from PTR_ERR(). |
| 278 | */ |
| 279 | struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name, |
| 280 | u32 name_len) |
| 281 | { |
| 282 | struct inode *vi; |
| 283 | ntfs_attr na; |
| 284 | int err; |
| 285 | |
| 286 | na.mft_no = base_vi->i_ino; |
| 287 | na.type = AT_INDEX_ALLOCATION; |
| 288 | na.name = name; |
| 289 | na.name_len = name_len; |
| 290 | |
| 291 | vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode, |
| 292 | (set_t)ntfs_init_locked_inode, &na); |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 293 | if (unlikely(!vi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | return ERR_PTR(-ENOMEM); |
| 295 | |
| 296 | err = 0; |
| 297 | |
| 298 | /* If this is a freshly allocated inode, need to read it now. */ |
| 299 | if (vi->i_state & I_NEW) { |
| 300 | err = ntfs_read_locked_index_inode(base_vi, vi); |
| 301 | unlock_new_inode(vi); |
| 302 | } |
| 303 | /* |
| 304 | * There is no point in keeping bad index inodes around. This also |
| 305 | * simplifies things in that we never need to check for bad index |
| 306 | * inodes elsewhere. |
| 307 | */ |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 308 | if (unlikely(err)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | iput(vi); |
| 310 | vi = ERR_PTR(err); |
| 311 | } |
| 312 | return vi; |
| 313 | } |
| 314 | |
| 315 | struct inode *ntfs_alloc_big_inode(struct super_block *sb) |
| 316 | { |
| 317 | ntfs_inode *ni; |
| 318 | |
| 319 | ntfs_debug("Entering."); |
Pekka Enberg | 2fb21db | 2005-05-25 21:15:34 +0300 | [diff] [blame] | 320 | ni = kmem_cache_alloc(ntfs_big_inode_cache, SLAB_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | if (likely(ni != NULL)) { |
| 322 | ni->state = 0; |
| 323 | return VFS_I(ni); |
| 324 | } |
| 325 | ntfs_error(sb, "Allocation of NTFS big inode structure failed."); |
| 326 | return NULL; |
| 327 | } |
| 328 | |
| 329 | void ntfs_destroy_big_inode(struct inode *inode) |
| 330 | { |
| 331 | ntfs_inode *ni = NTFS_I(inode); |
| 332 | |
| 333 | ntfs_debug("Entering."); |
| 334 | BUG_ON(ni->page); |
| 335 | if (!atomic_dec_and_test(&ni->count)) |
| 336 | BUG(); |
| 337 | kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode)); |
| 338 | } |
| 339 | |
| 340 | static inline ntfs_inode *ntfs_alloc_extent_inode(void) |
| 341 | { |
| 342 | ntfs_inode *ni; |
| 343 | |
| 344 | ntfs_debug("Entering."); |
Pekka Enberg | 2fb21db | 2005-05-25 21:15:34 +0300 | [diff] [blame] | 345 | ni = kmem_cache_alloc(ntfs_inode_cache, SLAB_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (likely(ni != NULL)) { |
| 347 | ni->state = 0; |
| 348 | return ni; |
| 349 | } |
| 350 | ntfs_error(NULL, "Allocation of NTFS inode structure failed."); |
| 351 | return NULL; |
| 352 | } |
| 353 | |
| 354 | static void ntfs_destroy_extent_inode(ntfs_inode *ni) |
| 355 | { |
| 356 | ntfs_debug("Entering."); |
| 357 | BUG_ON(ni->page); |
| 358 | if (!atomic_dec_and_test(&ni->count)) |
| 359 | BUG(); |
| 360 | kmem_cache_free(ntfs_inode_cache, ni); |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * __ntfs_init_inode - initialize ntfs specific part of an inode |
| 365 | * @sb: super block of mounted volume |
| 366 | * @ni: freshly allocated ntfs inode which to initialize |
| 367 | * |
| 368 | * Initialize an ntfs inode to defaults. |
| 369 | * |
| 370 | * NOTE: ni->mft_no, ni->state, ni->type, ni->name, and ni->name_len are left |
| 371 | * untouched. Make sure to initialize them elsewhere. |
| 372 | * |
| 373 | * Return zero on success and -ENOMEM on error. |
| 374 | */ |
| 375 | void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni) |
| 376 | { |
| 377 | ntfs_debug("Entering."); |
Anton Altaparmakov | 3676367 | 2004-11-18 13:46:45 +0000 | [diff] [blame] | 378 | rwlock_init(&ni->size_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | ni->initialized_size = ni->allocated_size = 0; |
| 380 | ni->seq_no = 0; |
| 381 | atomic_set(&ni->count, 1); |
| 382 | ni->vol = NTFS_SB(sb); |
| 383 | ntfs_init_runlist(&ni->runlist); |
| 384 | init_MUTEX(&ni->mrec_lock); |
| 385 | ni->page = NULL; |
| 386 | ni->page_ofs = 0; |
| 387 | ni->attr_list_size = 0; |
| 388 | ni->attr_list = NULL; |
| 389 | ntfs_init_runlist(&ni->attr_list_rl); |
| 390 | ni->itype.index.bmp_ino = NULL; |
| 391 | ni->itype.index.block_size = 0; |
| 392 | ni->itype.index.vcn_size = 0; |
| 393 | ni->itype.index.collation_rule = 0; |
| 394 | ni->itype.index.block_size_bits = 0; |
| 395 | ni->itype.index.vcn_size_bits = 0; |
| 396 | init_MUTEX(&ni->extent_lock); |
| 397 | ni->nr_extents = 0; |
| 398 | ni->ext.base_ntfs_ino = NULL; |
| 399 | } |
| 400 | |
| 401 | inline ntfs_inode *ntfs_new_extent_inode(struct super_block *sb, |
| 402 | unsigned long mft_no) |
| 403 | { |
| 404 | ntfs_inode *ni = ntfs_alloc_extent_inode(); |
| 405 | |
| 406 | ntfs_debug("Entering."); |
| 407 | if (likely(ni != NULL)) { |
| 408 | __ntfs_init_inode(sb, ni); |
| 409 | ni->mft_no = mft_no; |
| 410 | ni->type = AT_UNUSED; |
| 411 | ni->name = NULL; |
| 412 | ni->name_len = 0; |
| 413 | } |
| 414 | return ni; |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * ntfs_is_extended_system_file - check if a file is in the $Extend directory |
| 419 | * @ctx: initialized attribute search context |
| 420 | * |
| 421 | * Search all file name attributes in the inode described by the attribute |
| 422 | * search context @ctx and check if any of the names are in the $Extend system |
| 423 | * directory. |
| 424 | * |
| 425 | * Return values: |
| 426 | * 1: file is in $Extend directory |
| 427 | * 0: file is not in $Extend directory |
| 428 | * -errno: failed to determine if the file is in the $Extend directory |
| 429 | */ |
| 430 | static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx) |
| 431 | { |
| 432 | int nr_links, err; |
| 433 | |
| 434 | /* Restart search. */ |
| 435 | ntfs_attr_reinit_search_ctx(ctx); |
| 436 | |
| 437 | /* Get number of hard links. */ |
| 438 | nr_links = le16_to_cpu(ctx->mrec->link_count); |
| 439 | |
| 440 | /* Loop through all hard links. */ |
| 441 | while (!(err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0, |
| 442 | ctx))) { |
| 443 | FILE_NAME_ATTR *file_name_attr; |
| 444 | ATTR_RECORD *attr = ctx->attr; |
| 445 | u8 *p, *p2; |
| 446 | |
| 447 | nr_links--; |
| 448 | /* |
| 449 | * Maximum sanity checking as we are called on an inode that |
| 450 | * we suspect might be corrupt. |
| 451 | */ |
| 452 | p = (u8*)attr + le32_to_cpu(attr->length); |
| 453 | if (p < (u8*)ctx->mrec || (u8*)p > (u8*)ctx->mrec + |
| 454 | le32_to_cpu(ctx->mrec->bytes_in_use)) { |
| 455 | err_corrupt_attr: |
| 456 | ntfs_error(ctx->ntfs_ino->vol->sb, "Corrupt file name " |
| 457 | "attribute. You should run chkdsk."); |
| 458 | return -EIO; |
| 459 | } |
| 460 | if (attr->non_resident) { |
| 461 | ntfs_error(ctx->ntfs_ino->vol->sb, "Non-resident file " |
| 462 | "name. You should run chkdsk."); |
| 463 | return -EIO; |
| 464 | } |
| 465 | if (attr->flags) { |
| 466 | ntfs_error(ctx->ntfs_ino->vol->sb, "File name with " |
| 467 | "invalid flags. You should run " |
| 468 | "chkdsk."); |
| 469 | return -EIO; |
| 470 | } |
| 471 | if (!(attr->data.resident.flags & RESIDENT_ATTR_IS_INDEXED)) { |
| 472 | ntfs_error(ctx->ntfs_ino->vol->sb, "Unindexed file " |
| 473 | "name. You should run chkdsk."); |
| 474 | return -EIO; |
| 475 | } |
| 476 | file_name_attr = (FILE_NAME_ATTR*)((u8*)attr + |
| 477 | le16_to_cpu(attr->data.resident.value_offset)); |
| 478 | p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length); |
| 479 | if (p2 < (u8*)attr || p2 > p) |
| 480 | goto err_corrupt_attr; |
| 481 | /* This attribute is ok, but is it in the $Extend directory? */ |
| 482 | if (MREF_LE(file_name_attr->parent_directory) == FILE_Extend) |
| 483 | return 1; /* YES, it's an extended system file. */ |
| 484 | } |
| 485 | if (unlikely(err != -ENOENT)) |
| 486 | return err; |
| 487 | if (unlikely(nr_links)) { |
| 488 | ntfs_error(ctx->ntfs_ino->vol->sb, "Inode hard link count " |
| 489 | "doesn't match number of name attributes. You " |
| 490 | "should run chkdsk."); |
| 491 | return -EIO; |
| 492 | } |
| 493 | return 0; /* NO, it is not an extended system file. */ |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * ntfs_read_locked_inode - read an inode from its device |
| 498 | * @vi: inode to read |
| 499 | * |
| 500 | * ntfs_read_locked_inode() is called from ntfs_iget() to read the inode |
| 501 | * described by @vi into memory from the device. |
| 502 | * |
| 503 | * The only fields in @vi that we need to/can look at when the function is |
| 504 | * called are i_sb, pointing to the mounted device's super block, and i_ino, |
| 505 | * the number of the inode to load. |
| 506 | * |
| 507 | * ntfs_read_locked_inode() maps, pins and locks the mft record number i_ino |
| 508 | * for reading and sets up the necessary @vi fields as well as initializing |
| 509 | * the ntfs inode. |
| 510 | * |
| 511 | * Q: What locks are held when the function is called? |
| 512 | * A: i_state has I_LOCK set, hence the inode is locked, also |
| 513 | * i_count is set to 1, so it is not going to go away |
| 514 | * i_flags is set to 0 and we have no business touching it. Only an ioctl() |
| 515 | * is allowed to write to them. We should of course be honouring them but |
| 516 | * we need to do that using the IS_* macros defined in include/linux/fs.h. |
| 517 | * In any case ntfs_read_locked_inode() has nothing to do with i_flags. |
| 518 | * |
| 519 | * Return 0 on success and -errno on error. In the error case, the inode will |
| 520 | * have had make_bad_inode() executed on it. |
| 521 | */ |
| 522 | static int ntfs_read_locked_inode(struct inode *vi) |
| 523 | { |
| 524 | ntfs_volume *vol = NTFS_SB(vi->i_sb); |
| 525 | ntfs_inode *ni; |
| 526 | MFT_RECORD *m; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 527 | ATTR_RECORD *a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | STANDARD_INFORMATION *si; |
| 529 | ntfs_attr_search_ctx *ctx; |
| 530 | int err = 0; |
| 531 | |
| 532 | ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino); |
| 533 | |
| 534 | /* Setup the generic vfs inode parts now. */ |
| 535 | |
| 536 | /* This is the optimal IO size (for stat), not the fs block size. */ |
| 537 | vi->i_blksize = PAGE_CACHE_SIZE; |
| 538 | /* |
| 539 | * This is for checking whether an inode has changed w.r.t. a file so |
| 540 | * that the file can be updated if necessary (compare with f_version). |
| 541 | */ |
| 542 | vi->i_version = 1; |
| 543 | |
| 544 | vi->i_uid = vol->uid; |
| 545 | vi->i_gid = vol->gid; |
| 546 | vi->i_mode = 0; |
| 547 | |
| 548 | /* |
| 549 | * Initialize the ntfs specific part of @vi special casing |
| 550 | * FILE_MFT which we need to do at mount time. |
| 551 | */ |
| 552 | if (vi->i_ino != FILE_MFT) |
| 553 | ntfs_init_big_inode(vi); |
| 554 | ni = NTFS_I(vi); |
| 555 | |
| 556 | m = map_mft_record(ni); |
| 557 | if (IS_ERR(m)) { |
| 558 | err = PTR_ERR(m); |
| 559 | goto err_out; |
| 560 | } |
| 561 | ctx = ntfs_attr_get_search_ctx(ni, m); |
| 562 | if (!ctx) { |
| 563 | err = -ENOMEM; |
| 564 | goto unm_err_out; |
| 565 | } |
| 566 | |
| 567 | if (!(m->flags & MFT_RECORD_IN_USE)) { |
| 568 | ntfs_error(vi->i_sb, "Inode is not in use!"); |
| 569 | goto unm_err_out; |
| 570 | } |
| 571 | if (m->base_mft_record) { |
| 572 | ntfs_error(vi->i_sb, "Inode is an extent inode!"); |
| 573 | goto unm_err_out; |
| 574 | } |
| 575 | |
| 576 | /* Transfer information from mft record into vfs and ntfs inodes. */ |
| 577 | vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number); |
| 578 | |
| 579 | /* |
| 580 | * FIXME: Keep in mind that link_count is two for files which have both |
| 581 | * a long file name and a short file name as separate entries, so if |
| 582 | * we are hiding short file names this will be too high. Either we need |
| 583 | * to account for the short file names by subtracting them or we need |
| 584 | * to make sure we delete files even though i_nlink is not zero which |
| 585 | * might be tricky due to vfs interactions. Need to think about this |
| 586 | * some more when implementing the unlink command. |
| 587 | */ |
| 588 | vi->i_nlink = le16_to_cpu(m->link_count); |
| 589 | /* |
| 590 | * FIXME: Reparse points can have the directory bit set even though |
| 591 | * they would be S_IFLNK. Need to deal with this further below when we |
| 592 | * implement reparse points / symbolic links but it will do for now. |
| 593 | * Also if not a directory, it could be something else, rather than |
| 594 | * a regular file. But again, will do for now. |
| 595 | */ |
| 596 | /* Everyone gets all permissions. */ |
| 597 | vi->i_mode |= S_IRWXUGO; |
| 598 | /* If read-only, noone gets write permissions. */ |
| 599 | if (IS_RDONLY(vi)) |
| 600 | vi->i_mode &= ~S_IWUGO; |
| 601 | if (m->flags & MFT_RECORD_IS_DIRECTORY) { |
| 602 | vi->i_mode |= S_IFDIR; |
| 603 | /* |
| 604 | * Apply the directory permissions mask set in the mount |
| 605 | * options. |
| 606 | */ |
| 607 | vi->i_mode &= ~vol->dmask; |
| 608 | /* Things break without this kludge! */ |
| 609 | if (vi->i_nlink > 1) |
| 610 | vi->i_nlink = 1; |
| 611 | } else { |
| 612 | vi->i_mode |= S_IFREG; |
| 613 | /* Apply the file permissions mask set in the mount options. */ |
| 614 | vi->i_mode &= ~vol->fmask; |
| 615 | } |
| 616 | /* |
| 617 | * Find the standard information attribute in the mft record. At this |
| 618 | * stage we haven't setup the attribute list stuff yet, so this could |
| 619 | * in fact fail if the standard information is in an extent record, but |
| 620 | * I don't think this actually ever happens. |
| 621 | */ |
| 622 | err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, 0, 0, NULL, 0, |
| 623 | ctx); |
| 624 | if (unlikely(err)) { |
| 625 | if (err == -ENOENT) { |
| 626 | /* |
| 627 | * TODO: We should be performing a hot fix here (if the |
| 628 | * recover mount option is set) by creating a new |
| 629 | * attribute. |
| 630 | */ |
| 631 | ntfs_error(vi->i_sb, "$STANDARD_INFORMATION attribute " |
| 632 | "is missing."); |
| 633 | } |
| 634 | goto unm_err_out; |
| 635 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 636 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | /* Get the standard information attribute value. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 638 | si = (STANDARD_INFORMATION*)((u8*)a + |
| 639 | le16_to_cpu(a->data.resident.value_offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
| 641 | /* Transfer information from the standard information into vi. */ |
| 642 | /* |
| 643 | * Note: The i_?times do not quite map perfectly onto the NTFS times, |
| 644 | * but they are close enough, and in the end it doesn't really matter |
| 645 | * that much... |
| 646 | */ |
| 647 | /* |
| 648 | * mtime is the last change of the data within the file. Not changed |
| 649 | * when only metadata is changed, e.g. a rename doesn't affect mtime. |
| 650 | */ |
| 651 | vi->i_mtime = ntfs2utc(si->last_data_change_time); |
| 652 | /* |
| 653 | * ctime is the last change of the metadata of the file. This obviously |
| 654 | * always changes, when mtime is changed. ctime can be changed on its |
| 655 | * own, mtime is then not changed, e.g. when a file is renamed. |
| 656 | */ |
| 657 | vi->i_ctime = ntfs2utc(si->last_mft_change_time); |
| 658 | /* |
| 659 | * Last access to the data within the file. Not changed during a rename |
| 660 | * for example but changed whenever the file is written to. |
| 661 | */ |
| 662 | vi->i_atime = ntfs2utc(si->last_access_time); |
| 663 | |
| 664 | /* Find the attribute list attribute if present. */ |
| 665 | ntfs_attr_reinit_search_ctx(ctx); |
| 666 | err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx); |
| 667 | if (err) { |
| 668 | if (unlikely(err != -ENOENT)) { |
| 669 | ntfs_error(vi->i_sb, "Failed to lookup attribute list " |
| 670 | "attribute."); |
| 671 | goto unm_err_out; |
| 672 | } |
| 673 | } else /* if (!err) */ { |
| 674 | if (vi->i_ino == FILE_MFT) |
| 675 | goto skip_attr_list_load; |
| 676 | ntfs_debug("Attribute list found in inode 0x%lx.", vi->i_ino); |
| 677 | NInoSetAttrList(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 678 | a = ctx->attr; |
| 679 | if (a->flags & ATTR_IS_ENCRYPTED || |
| 680 | a->flags & ATTR_COMPRESSION_MASK || |
| 681 | a->flags & ATTR_IS_SPARSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | ntfs_error(vi->i_sb, "Attribute list attribute is " |
| 683 | "compressed/encrypted/sparse."); |
| 684 | goto unm_err_out; |
| 685 | } |
| 686 | /* Now allocate memory for the attribute list. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 687 | ni->attr_list_size = (u32)ntfs_attr_size(a); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size); |
| 689 | if (!ni->attr_list) { |
| 690 | ntfs_error(vi->i_sb, "Not enough memory to allocate " |
| 691 | "buffer for attribute list."); |
| 692 | err = -ENOMEM; |
| 693 | goto unm_err_out; |
| 694 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 695 | if (a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | NInoSetAttrListNonResident(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 697 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | ntfs_error(vi->i_sb, "Attribute list has non " |
| 699 | "zero lowest_vcn."); |
| 700 | goto unm_err_out; |
| 701 | } |
| 702 | /* |
| 703 | * Setup the runlist. No need for locking as we have |
| 704 | * exclusive access to the inode at this time. |
| 705 | */ |
| 706 | ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol, |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 707 | a, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | if (IS_ERR(ni->attr_list_rl.rl)) { |
| 709 | err = PTR_ERR(ni->attr_list_rl.rl); |
| 710 | ni->attr_list_rl.rl = NULL; |
| 711 | ntfs_error(vi->i_sb, "Mapping pairs " |
| 712 | "decompression failed."); |
| 713 | goto unm_err_out; |
| 714 | } |
| 715 | /* Now load the attribute list. */ |
| 716 | if ((err = load_attribute_list(vol, &ni->attr_list_rl, |
| 717 | ni->attr_list, ni->attr_list_size, |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 718 | sle64_to_cpu(a->data.non_resident. |
| 719 | initialized_size)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | ntfs_error(vi->i_sb, "Failed to load " |
| 721 | "attribute list attribute."); |
| 722 | goto unm_err_out; |
| 723 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 724 | } else /* if (!a->non_resident) */ { |
| 725 | if ((u8*)a + le16_to_cpu(a->data.resident.value_offset) |
| 726 | + le32_to_cpu( |
| 727 | a->data.resident.value_length) > |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | (u8*)ctx->mrec + vol->mft_record_size) { |
| 729 | ntfs_error(vi->i_sb, "Corrupt attribute list " |
| 730 | "in inode."); |
| 731 | goto unm_err_out; |
| 732 | } |
| 733 | /* Now copy the attribute list. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 734 | memcpy(ni->attr_list, (u8*)a + le16_to_cpu( |
| 735 | a->data.resident.value_offset), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | le32_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 737 | a->data.resident.value_length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
| 739 | } |
| 740 | skip_attr_list_load: |
| 741 | /* |
| 742 | * If an attribute list is present we now have the attribute list value |
| 743 | * in ntfs_ino->attr_list and it is ntfs_ino->attr_list_size bytes. |
| 744 | */ |
| 745 | if (S_ISDIR(vi->i_mode)) { |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 746 | loff_t bvi_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | struct inode *bvi; |
| 748 | ntfs_inode *bni; |
| 749 | INDEX_ROOT *ir; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 750 | u8 *ir_end, *index_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | /* It is a directory, find index root attribute. */ |
| 753 | ntfs_attr_reinit_search_ctx(ctx); |
| 754 | err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE, |
| 755 | 0, NULL, 0, ctx); |
| 756 | if (unlikely(err)) { |
| 757 | if (err == -ENOENT) { |
| 758 | // FIXME: File is corrupt! Hot-fix with empty |
| 759 | // index root attribute if recovery option is |
| 760 | // set. |
| 761 | ntfs_error(vi->i_sb, "$INDEX_ROOT attribute " |
| 762 | "is missing."); |
| 763 | } |
| 764 | goto unm_err_out; |
| 765 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 766 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | /* Set up the state. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 768 | if (unlikely(a->non_resident)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | ntfs_error(vol->sb, "$INDEX_ROOT attribute is not " |
| 770 | "resident."); |
| 771 | goto unm_err_out; |
| 772 | } |
| 773 | /* Ensure the attribute name is placed before the value. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 774 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 775 | le16_to_cpu(a->data.resident.value_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | ntfs_error(vol->sb, "$INDEX_ROOT attribute name is " |
| 777 | "placed after the attribute value."); |
| 778 | goto unm_err_out; |
| 779 | } |
| 780 | /* |
| 781 | * Compressed/encrypted index root just means that the newly |
| 782 | * created files in that directory should be created compressed/ |
| 783 | * encrypted. However index root cannot be both compressed and |
| 784 | * encrypted. |
| 785 | */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 786 | if (a->flags & ATTR_COMPRESSION_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | NInoSetCompressed(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 788 | if (a->flags & ATTR_IS_ENCRYPTED) { |
| 789 | if (a->flags & ATTR_COMPRESSION_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | ntfs_error(vi->i_sb, "Found encrypted and " |
| 791 | "compressed attribute."); |
| 792 | goto unm_err_out; |
| 793 | } |
| 794 | NInoSetEncrypted(ni); |
| 795 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 796 | if (a->flags & ATTR_IS_SPARSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | NInoSetSparse(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 798 | ir = (INDEX_ROOT*)((u8*)a + |
| 799 | le16_to_cpu(a->data.resident.value_offset)); |
| 800 | ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length); |
| 801 | if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is " |
| 803 | "corrupt."); |
| 804 | goto unm_err_out; |
| 805 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 806 | index_end = (u8*)&ir->index + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | le32_to_cpu(ir->index.index_length); |
| 808 | if (index_end > ir_end) { |
| 809 | ntfs_error(vi->i_sb, "Directory index is corrupt."); |
| 810 | goto unm_err_out; |
| 811 | } |
| 812 | if (ir->type != AT_FILE_NAME) { |
| 813 | ntfs_error(vi->i_sb, "Indexed attribute is not " |
| 814 | "$FILE_NAME."); |
| 815 | goto unm_err_out; |
| 816 | } |
| 817 | if (ir->collation_rule != COLLATION_FILE_NAME) { |
| 818 | ntfs_error(vi->i_sb, "Index collation rule is not " |
| 819 | "COLLATION_FILE_NAME."); |
| 820 | goto unm_err_out; |
| 821 | } |
| 822 | ni->itype.index.collation_rule = ir->collation_rule; |
| 823 | ni->itype.index.block_size = le32_to_cpu(ir->index_block_size); |
| 824 | if (ni->itype.index.block_size & |
| 825 | (ni->itype.index.block_size - 1)) { |
| 826 | ntfs_error(vi->i_sb, "Index block size (%u) is not a " |
| 827 | "power of two.", |
| 828 | ni->itype.index.block_size); |
| 829 | goto unm_err_out; |
| 830 | } |
| 831 | if (ni->itype.index.block_size > PAGE_CACHE_SIZE) { |
| 832 | ntfs_error(vi->i_sb, "Index block size (%u) > " |
| 833 | "PAGE_CACHE_SIZE (%ld) is not " |
| 834 | "supported. Sorry.", |
| 835 | ni->itype.index.block_size, |
| 836 | PAGE_CACHE_SIZE); |
| 837 | err = -EOPNOTSUPP; |
| 838 | goto unm_err_out; |
| 839 | } |
| 840 | if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) { |
| 841 | ntfs_error(vi->i_sb, "Index block size (%u) < " |
| 842 | "NTFS_BLOCK_SIZE (%i) is not " |
| 843 | "supported. Sorry.", |
| 844 | ni->itype.index.block_size, |
| 845 | NTFS_BLOCK_SIZE); |
| 846 | err = -EOPNOTSUPP; |
| 847 | goto unm_err_out; |
| 848 | } |
| 849 | ni->itype.index.block_size_bits = |
| 850 | ffs(ni->itype.index.block_size) - 1; |
| 851 | /* Determine the size of a vcn in the directory index. */ |
| 852 | if (vol->cluster_size <= ni->itype.index.block_size) { |
| 853 | ni->itype.index.vcn_size = vol->cluster_size; |
| 854 | ni->itype.index.vcn_size_bits = vol->cluster_size_bits; |
| 855 | } else { |
| 856 | ni->itype.index.vcn_size = vol->sector_size; |
| 857 | ni->itype.index.vcn_size_bits = vol->sector_size_bits; |
| 858 | } |
| 859 | |
| 860 | /* Setup the index allocation attribute, even if not present. */ |
| 861 | NInoSetMstProtected(ni); |
| 862 | ni->type = AT_INDEX_ALLOCATION; |
| 863 | ni->name = I30; |
| 864 | ni->name_len = 4; |
| 865 | |
| 866 | if (!(ir->index.flags & LARGE_INDEX)) { |
| 867 | /* No index allocation. */ |
| 868 | vi->i_size = ni->initialized_size = |
| 869 | ni->allocated_size = 0; |
| 870 | /* We are done with the mft record, so we release it. */ |
| 871 | ntfs_attr_put_search_ctx(ctx); |
| 872 | unmap_mft_record(ni); |
| 873 | m = NULL; |
| 874 | ctx = NULL; |
| 875 | goto skip_large_dir_stuff; |
| 876 | } /* LARGE_INDEX: Index allocation present. Setup state. */ |
| 877 | NInoSetIndexAllocPresent(ni); |
| 878 | /* Find index allocation attribute. */ |
| 879 | ntfs_attr_reinit_search_ctx(ctx); |
| 880 | err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4, |
| 881 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 882 | if (unlikely(err)) { |
| 883 | if (err == -ENOENT) |
| 884 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION " |
| 885 | "attribute is not present but " |
| 886 | "$INDEX_ROOT indicated it is."); |
| 887 | else |
| 888 | ntfs_error(vi->i_sb, "Failed to lookup " |
| 889 | "$INDEX_ALLOCATION " |
| 890 | "attribute."); |
| 891 | goto unm_err_out; |
| 892 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 893 | a = ctx->attr; |
| 894 | if (!a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute " |
| 896 | "is resident."); |
| 897 | goto unm_err_out; |
| 898 | } |
| 899 | /* |
| 900 | * Ensure the attribute name is placed before the mapping pairs |
| 901 | * array. |
| 902 | */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 903 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 904 | le16_to_cpu( |
| 905 | a->data.non_resident.mapping_pairs_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name " |
| 907 | "is placed after the mapping pairs " |
| 908 | "array."); |
| 909 | goto unm_err_out; |
| 910 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 911 | if (a->flags & ATTR_IS_ENCRYPTED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute " |
| 913 | "is encrypted."); |
| 914 | goto unm_err_out; |
| 915 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 916 | if (a->flags & ATTR_IS_SPARSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute " |
| 918 | "is sparse."); |
| 919 | goto unm_err_out; |
| 920 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 921 | if (a->flags & ATTR_COMPRESSION_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute " |
| 923 | "is compressed."); |
| 924 | goto unm_err_out; |
| 925 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 926 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | ntfs_error(vi->i_sb, "First extent of " |
| 928 | "$INDEX_ALLOCATION attribute has non " |
| 929 | "zero lowest_vcn."); |
| 930 | goto unm_err_out; |
| 931 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 932 | vi->i_size = sle64_to_cpu(a->data.non_resident.data_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | ni->initialized_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 934 | a->data.non_resident.initialized_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | ni->allocated_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 936 | a->data.non_resident.allocated_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | /* |
| 938 | * We are done with the mft record, so we release it. Otherwise |
| 939 | * we would deadlock in ntfs_attr_iget(). |
| 940 | */ |
| 941 | ntfs_attr_put_search_ctx(ctx); |
| 942 | unmap_mft_record(ni); |
| 943 | m = NULL; |
| 944 | ctx = NULL; |
| 945 | /* Get the index bitmap attribute inode. */ |
| 946 | bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4); |
| 947 | if (IS_ERR(bvi)) { |
| 948 | ntfs_error(vi->i_sb, "Failed to get bitmap attribute."); |
| 949 | err = PTR_ERR(bvi); |
| 950 | goto unm_err_out; |
| 951 | } |
| 952 | ni->itype.index.bmp_ino = bvi; |
| 953 | bni = NTFS_I(bvi); |
| 954 | if (NInoCompressed(bni) || NInoEncrypted(bni) || |
| 955 | NInoSparse(bni)) { |
| 956 | ntfs_error(vi->i_sb, "$BITMAP attribute is compressed " |
| 957 | "and/or encrypted and/or sparse."); |
| 958 | goto unm_err_out; |
| 959 | } |
| 960 | /* Consistency check bitmap size vs. index allocation size. */ |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 961 | bvi_size = i_size_read(bvi); |
| 962 | if ((bvi_size << 3) < (vi->i_size >> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | ni->itype.index.block_size_bits)) { |
| 964 | ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) " |
| 965 | "for index allocation (0x%llx).", |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 966 | bvi_size << 3, vi->i_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | goto unm_err_out; |
| 968 | } |
| 969 | skip_large_dir_stuff: |
| 970 | /* Setup the operations for this inode. */ |
| 971 | vi->i_op = &ntfs_dir_inode_ops; |
| 972 | vi->i_fop = &ntfs_dir_ops; |
| 973 | } else { |
| 974 | /* It is a file. */ |
| 975 | ntfs_attr_reinit_search_ctx(ctx); |
| 976 | |
| 977 | /* Setup the data attribute, even if not present. */ |
| 978 | ni->type = AT_DATA; |
| 979 | ni->name = NULL; |
| 980 | ni->name_len = 0; |
| 981 | |
| 982 | /* Find first extent of the unnamed data attribute. */ |
| 983 | err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx); |
| 984 | if (unlikely(err)) { |
| 985 | vi->i_size = ni->initialized_size = |
| 986 | ni->allocated_size = 0; |
| 987 | if (err != -ENOENT) { |
| 988 | ntfs_error(vi->i_sb, "Failed to lookup $DATA " |
| 989 | "attribute."); |
| 990 | goto unm_err_out; |
| 991 | } |
| 992 | /* |
| 993 | * FILE_Secure does not have an unnamed $DATA |
| 994 | * attribute, so we special case it here. |
| 995 | */ |
| 996 | if (vi->i_ino == FILE_Secure) |
| 997 | goto no_data_attr_special_case; |
| 998 | /* |
| 999 | * Most if not all the system files in the $Extend |
| 1000 | * system directory do not have unnamed data |
| 1001 | * attributes so we need to check if the parent |
| 1002 | * directory of the file is FILE_Extend and if it is |
| 1003 | * ignore this error. To do this we need to get the |
| 1004 | * name of this inode from the mft record as the name |
| 1005 | * contains the back reference to the parent directory. |
| 1006 | */ |
| 1007 | if (ntfs_is_extended_system_file(ctx) > 0) |
| 1008 | goto no_data_attr_special_case; |
| 1009 | // FIXME: File is corrupt! Hot-fix with empty data |
| 1010 | // attribute if recovery option is set. |
| 1011 | ntfs_error(vi->i_sb, "$DATA attribute is missing."); |
| 1012 | goto unm_err_out; |
| 1013 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1014 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | /* Setup the state. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1016 | if (a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | NInoSetNonResident(ni); |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1018 | if (a->flags & (ATTR_COMPRESSION_MASK | |
| 1019 | ATTR_IS_SPARSE)) { |
| 1020 | if (a->flags & ATTR_COMPRESSION_MASK) { |
| 1021 | NInoSetCompressed(ni); |
| 1022 | if (vol->cluster_size > 4096) { |
| 1023 | ntfs_error(vi->i_sb, "Found " |
| 1024 | "compressed data but " |
| 1025 | "compression is " |
| 1026 | "disabled due to " |
| 1027 | "cluster size (%i) > " |
| 1028 | "4kiB.", |
| 1029 | vol->cluster_size); |
| 1030 | goto unm_err_out; |
| 1031 | } |
| 1032 | if ((a->flags & ATTR_COMPRESSION_MASK) |
| 1033 | != ATTR_IS_COMPRESSED) { |
| 1034 | ntfs_error(vi->i_sb, "Found " |
| 1035 | "unknown compression " |
| 1036 | "method or corrupt " |
| 1037 | "file."); |
| 1038 | goto unm_err_out; |
| 1039 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | } |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1041 | if (a->flags & ATTR_IS_SPARSE) |
| 1042 | NInoSetSparse(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1043 | if (a->data.non_resident.compression_unit != |
| 1044 | 4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | ntfs_error(vi->i_sb, "Found " |
| 1046 | "nonstandard compression unit " |
| 1047 | "(%u instead of 4). Cannot " |
| 1048 | "handle this.", |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1049 | a->data.non_resident. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | compression_unit); |
| 1051 | err = -EOPNOTSUPP; |
| 1052 | goto unm_err_out; |
| 1053 | } |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1054 | ni->itype.compressed.block_clusters = 1U << |
| 1055 | a->data.non_resident. |
| 1056 | compression_unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | ni->itype.compressed.block_size = 1U << ( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1058 | a->data.non_resident. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | compression_unit + |
| 1060 | vol->cluster_size_bits); |
| 1061 | ni->itype.compressed.block_size_bits = ffs( |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1062 | ni->itype.compressed. |
| 1063 | block_size) - 1; |
| 1064 | ni->itype.compressed.size = sle64_to_cpu( |
| 1065 | a->data.non_resident. |
| 1066 | compressed_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1068 | if (a->flags & ATTR_IS_ENCRYPTED) { |
| 1069 | if (a->flags & ATTR_COMPRESSION_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | ntfs_error(vi->i_sb, "Found encrypted " |
| 1071 | "and compressed data."); |
| 1072 | goto unm_err_out; |
| 1073 | } |
| 1074 | NInoSetEncrypted(ni); |
| 1075 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1076 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | ntfs_error(vi->i_sb, "First extent of $DATA " |
| 1078 | "attribute has non zero " |
| 1079 | "lowest_vcn."); |
| 1080 | goto unm_err_out; |
| 1081 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | vi->i_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1083 | a->data.non_resident.data_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | ni->initialized_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1085 | a->data.non_resident.initialized_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | ni->allocated_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1087 | a->data.non_resident.allocated_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | } else { /* Resident attribute. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1089 | vi->i_size = ni->initialized_size = le32_to_cpu( |
| 1090 | a->data.resident.value_length); |
| 1091 | ni->allocated_size = le32_to_cpu(a->length) - |
| 1092 | le16_to_cpu( |
| 1093 | a->data.resident.value_offset); |
| 1094 | if (vi->i_size > ni->allocated_size) { |
| 1095 | ntfs_error(vi->i_sb, "Resident data attribute " |
| 1096 | "is corrupt (size exceeds " |
| 1097 | "allocation)."); |
| 1098 | goto unm_err_out; |
| 1099 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | no_data_attr_special_case: |
| 1102 | /* We are done with the mft record, so we release it. */ |
| 1103 | ntfs_attr_put_search_ctx(ctx); |
| 1104 | unmap_mft_record(ni); |
| 1105 | m = NULL; |
| 1106 | ctx = NULL; |
| 1107 | /* Setup the operations for this inode. */ |
| 1108 | vi->i_op = &ntfs_file_inode_ops; |
| 1109 | vi->i_fop = &ntfs_file_ops; |
| 1110 | } |
| 1111 | if (NInoMstProtected(ni)) |
| 1112 | vi->i_mapping->a_ops = &ntfs_mst_aops; |
| 1113 | else |
| 1114 | vi->i_mapping->a_ops = &ntfs_aops; |
| 1115 | /* |
| 1116 | * The number of 512-byte blocks used on disk (for stat). This is in so |
| 1117 | * far inaccurate as it doesn't account for any named streams or other |
| 1118 | * special non-resident attributes, but that is how Windows works, too, |
| 1119 | * so we are at least consistent with Windows, if not entirely |
| 1120 | * consistent with the Linux Way. Doing it the Linux Way would cause a |
| 1121 | * significant slowdown as it would involve iterating over all |
| 1122 | * attributes in the mft record and adding the allocated/compressed |
| 1123 | * sizes of all non-resident attributes present to give us the Linux |
| 1124 | * correct size that should go into i_blocks (after division by 512). |
| 1125 | */ |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1126 | if (S_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | vi->i_blocks = ni->itype.compressed.size >> 9; |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1128 | else |
| 1129 | vi->i_blocks = ni->allocated_size >> 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | ntfs_debug("Done."); |
| 1131 | return 0; |
| 1132 | |
| 1133 | unm_err_out: |
| 1134 | if (!err) |
| 1135 | err = -EIO; |
| 1136 | if (ctx) |
| 1137 | ntfs_attr_put_search_ctx(ctx); |
| 1138 | if (m) |
| 1139 | unmap_mft_record(ni); |
| 1140 | err_out: |
| 1141 | ntfs_error(vol->sb, "Failed with error code %i. Marking corrupt " |
| 1142 | "inode 0x%lx as bad. Run chkdsk.", err, vi->i_ino); |
| 1143 | make_bad_inode(vi); |
| 1144 | if (err != -EOPNOTSUPP && err != -ENOMEM) |
| 1145 | NVolSetErrors(vol); |
| 1146 | return err; |
| 1147 | } |
| 1148 | |
| 1149 | /** |
| 1150 | * ntfs_read_locked_attr_inode - read an attribute inode from its base inode |
| 1151 | * @base_vi: base inode |
| 1152 | * @vi: attribute inode to read |
| 1153 | * |
| 1154 | * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the |
| 1155 | * attribute inode described by @vi into memory from the base mft record |
| 1156 | * described by @base_ni. |
| 1157 | * |
| 1158 | * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for |
| 1159 | * reading and looks up the attribute described by @vi before setting up the |
| 1160 | * necessary fields in @vi as well as initializing the ntfs inode. |
| 1161 | * |
| 1162 | * Q: What locks are held when the function is called? |
| 1163 | * A: i_state has I_LOCK set, hence the inode is locked, also |
| 1164 | * i_count is set to 1, so it is not going to go away |
| 1165 | * |
| 1166 | * Return 0 on success and -errno on error. In the error case, the inode will |
| 1167 | * have had make_bad_inode() executed on it. |
| 1168 | */ |
| 1169 | static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi) |
| 1170 | { |
| 1171 | ntfs_volume *vol = NTFS_SB(vi->i_sb); |
| 1172 | ntfs_inode *ni, *base_ni; |
| 1173 | MFT_RECORD *m; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1174 | ATTR_RECORD *a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | ntfs_attr_search_ctx *ctx; |
| 1176 | int err = 0; |
| 1177 | |
| 1178 | ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino); |
| 1179 | |
| 1180 | ntfs_init_big_inode(vi); |
| 1181 | |
| 1182 | ni = NTFS_I(vi); |
| 1183 | base_ni = NTFS_I(base_vi); |
| 1184 | |
| 1185 | /* Just mirror the values from the base inode. */ |
| 1186 | vi->i_blksize = base_vi->i_blksize; |
| 1187 | vi->i_version = base_vi->i_version; |
| 1188 | vi->i_uid = base_vi->i_uid; |
| 1189 | vi->i_gid = base_vi->i_gid; |
| 1190 | vi->i_nlink = base_vi->i_nlink; |
| 1191 | vi->i_mtime = base_vi->i_mtime; |
| 1192 | vi->i_ctime = base_vi->i_ctime; |
| 1193 | vi->i_atime = base_vi->i_atime; |
| 1194 | vi->i_generation = ni->seq_no = base_ni->seq_no; |
| 1195 | |
| 1196 | /* Set inode type to zero but preserve permissions. */ |
| 1197 | vi->i_mode = base_vi->i_mode & ~S_IFMT; |
| 1198 | |
| 1199 | m = map_mft_record(base_ni); |
| 1200 | if (IS_ERR(m)) { |
| 1201 | err = PTR_ERR(m); |
| 1202 | goto err_out; |
| 1203 | } |
| 1204 | ctx = ntfs_attr_get_search_ctx(base_ni, m); |
| 1205 | if (!ctx) { |
| 1206 | err = -ENOMEM; |
| 1207 | goto unm_err_out; |
| 1208 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | /* Find the attribute. */ |
| 1210 | err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len, |
| 1211 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 1212 | if (unlikely(err)) |
| 1213 | goto unm_err_out; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1214 | a = ctx->attr; |
| 1215 | if (!a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | /* Ensure the attribute name is placed before the value. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1217 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 1218 | le16_to_cpu(a->data.resident.value_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | ntfs_error(vol->sb, "Attribute name is placed after " |
| 1220 | "the attribute value."); |
| 1221 | goto unm_err_out; |
| 1222 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1223 | if (NInoMstProtected(ni) || a->flags) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | ntfs_error(vi->i_sb, "Found mst protected attribute " |
| 1225 | "or attribute with non-zero flags but " |
| 1226 | "the attribute is resident. Please " |
| 1227 | "report you saw this message to " |
| 1228 | "linux-ntfs-dev@lists.sourceforge.net"); |
| 1229 | goto unm_err_out; |
| 1230 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1231 | vi->i_size = ni->initialized_size = le32_to_cpu( |
| 1232 | a->data.resident.value_length); |
| 1233 | ni->allocated_size = le32_to_cpu(a->length) - |
| 1234 | le16_to_cpu(a->data.resident.value_offset); |
| 1235 | if (vi->i_size > ni->allocated_size) { |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1236 | ntfs_error(vi->i_sb, "Resident attribute is corrupt " |
| 1237 | "(size exceeds allocation)."); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1238 | goto unm_err_out; |
| 1239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } else { |
| 1241 | NInoSetNonResident(ni); |
| 1242 | /* |
| 1243 | * Ensure the attribute name is placed before the mapping pairs |
| 1244 | * array. |
| 1245 | */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1246 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 1247 | le16_to_cpu( |
| 1248 | a->data.non_resident.mapping_pairs_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | ntfs_error(vol->sb, "Attribute name is placed after " |
| 1250 | "the mapping pairs array."); |
| 1251 | goto unm_err_out; |
| 1252 | } |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1253 | if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) { |
| 1254 | if (a->flags & ATTR_COMPRESSION_MASK) { |
| 1255 | NInoSetCompressed(ni); |
| 1256 | if ((ni->type != AT_DATA) || (ni->type == |
| 1257 | AT_DATA && ni->name_len)) { |
| 1258 | ntfs_error(vi->i_sb, "Found compressed " |
| 1259 | "non-data or named " |
| 1260 | "data attribute. " |
| 1261 | "Please report you " |
| 1262 | "saw this message to " |
| 1263 | "linux-ntfs-dev@lists." |
| 1264 | "sourceforge.net"); |
| 1265 | goto unm_err_out; |
| 1266 | } |
| 1267 | if (vol->cluster_size > 4096) { |
| 1268 | ntfs_error(vi->i_sb, "Found compressed " |
| 1269 | "attribute but " |
| 1270 | "compression is " |
| 1271 | "disabled due to " |
| 1272 | "cluster size (%i) > " |
| 1273 | "4kiB.", |
| 1274 | vol->cluster_size); |
| 1275 | goto unm_err_out; |
| 1276 | } |
| 1277 | if ((a->flags & ATTR_COMPRESSION_MASK) != |
| 1278 | ATTR_IS_COMPRESSED) { |
| 1279 | ntfs_error(vi->i_sb, "Found unknown " |
| 1280 | "compression method."); |
| 1281 | goto unm_err_out; |
| 1282 | } |
| 1283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | if (NInoMstProtected(ni)) { |
| 1285 | ntfs_error(vi->i_sb, "Found mst protected " |
| 1286 | "attribute but the attribute " |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1287 | "is %s. Please report you " |
| 1288 | "saw this message to " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | "linux-ntfs-dev@lists." |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1290 | "sourceforge.net", |
| 1291 | NInoCompressed(ni) ? |
| 1292 | "compressed" : "sparse"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | goto unm_err_out; |
| 1294 | } |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1295 | if (a->flags & ATTR_IS_SPARSE) |
| 1296 | NInoSetSparse(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1297 | if (a->data.non_resident.compression_unit != 4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | ntfs_error(vi->i_sb, "Found nonstandard " |
| 1299 | "compression unit (%u instead " |
| 1300 | "of 4). Cannot handle this.", |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1301 | a->data.non_resident. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | compression_unit); |
| 1303 | err = -EOPNOTSUPP; |
| 1304 | goto unm_err_out; |
| 1305 | } |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1306 | ni->itype.compressed.block_clusters = 1U << |
| 1307 | a->data.non_resident.compression_unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | ni->itype.compressed.block_size = 1U << ( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1309 | a->data.non_resident.compression_unit + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | vol->cluster_size_bits); |
| 1311 | ni->itype.compressed.block_size_bits = ffs( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1312 | ni->itype.compressed.block_size) - 1; |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1313 | ni->itype.compressed.size = sle64_to_cpu( |
| 1314 | a->data.non_resident.compressed_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1316 | if (a->flags & ATTR_IS_ENCRYPTED) { |
| 1317 | if (a->flags & ATTR_COMPRESSION_MASK) { |
| 1318 | ntfs_error(vi->i_sb, "Found encrypted and " |
| 1319 | "compressed data."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | goto unm_err_out; |
| 1321 | } |
| 1322 | if (NInoMstProtected(ni)) { |
| 1323 | ntfs_error(vi->i_sb, "Found mst protected " |
| 1324 | "attribute but the attribute " |
| 1325 | "is encrypted. Please report " |
| 1326 | "you saw this message to " |
| 1327 | "linux-ntfs-dev@lists." |
| 1328 | "sourceforge.net"); |
| 1329 | goto unm_err_out; |
| 1330 | } |
| 1331 | NInoSetEncrypted(ni); |
| 1332 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1333 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | ntfs_error(vi->i_sb, "First extent of attribute has " |
| 1335 | "non-zero lowest_vcn."); |
| 1336 | goto unm_err_out; |
| 1337 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1338 | vi->i_size = sle64_to_cpu(a->data.non_resident.data_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | ni->initialized_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1340 | a->data.non_resident.initialized_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | ni->allocated_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1342 | a->data.non_resident.allocated_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | /* Setup the operations for this attribute inode. */ |
| 1345 | vi->i_op = NULL; |
| 1346 | vi->i_fop = NULL; |
| 1347 | if (NInoMstProtected(ni)) |
| 1348 | vi->i_mapping->a_ops = &ntfs_mst_aops; |
| 1349 | else |
| 1350 | vi->i_mapping->a_ops = &ntfs_aops; |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1351 | if (NInoCompressed(ni) || NInoSparse(ni)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | vi->i_blocks = ni->itype.compressed.size >> 9; |
Anton Altaparmakov | 9451f85 | 2005-03-03 14:43:43 +0000 | [diff] [blame] | 1353 | else |
| 1354 | vi->i_blocks = ni->allocated_size >> 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | /* |
| 1356 | * Make sure the base inode doesn't go away and attach it to the |
| 1357 | * attribute inode. |
| 1358 | */ |
| 1359 | igrab(base_vi); |
| 1360 | ni->ext.base_ntfs_ino = base_ni; |
| 1361 | ni->nr_extents = -1; |
| 1362 | |
| 1363 | ntfs_attr_put_search_ctx(ctx); |
| 1364 | unmap_mft_record(base_ni); |
| 1365 | |
| 1366 | ntfs_debug("Done."); |
| 1367 | return 0; |
| 1368 | |
| 1369 | unm_err_out: |
| 1370 | if (!err) |
| 1371 | err = -EIO; |
| 1372 | if (ctx) |
| 1373 | ntfs_attr_put_search_ctx(ctx); |
| 1374 | unmap_mft_record(base_ni); |
| 1375 | err_out: |
| 1376 | ntfs_error(vol->sb, "Failed with error code %i while reading attribute " |
| 1377 | "inode (mft_no 0x%lx, type 0x%x, name_len %i). " |
| 1378 | "Marking corrupt inode and base inode 0x%lx as bad. " |
| 1379 | "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len, |
| 1380 | base_vi->i_ino); |
| 1381 | make_bad_inode(vi); |
| 1382 | make_bad_inode(base_vi); |
| 1383 | if (err != -ENOMEM) |
| 1384 | NVolSetErrors(vol); |
| 1385 | return err; |
| 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * ntfs_read_locked_index_inode - read an index inode from its base inode |
| 1390 | * @base_vi: base inode |
| 1391 | * @vi: index inode to read |
| 1392 | * |
| 1393 | * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the |
| 1394 | * index inode described by @vi into memory from the base mft record described |
| 1395 | * by @base_ni. |
| 1396 | * |
| 1397 | * ntfs_read_locked_index_inode() maps, pins and locks the base inode for |
| 1398 | * reading and looks up the attributes relating to the index described by @vi |
| 1399 | * before setting up the necessary fields in @vi as well as initializing the |
| 1400 | * ntfs inode. |
| 1401 | * |
| 1402 | * Note, index inodes are essentially attribute inodes (NInoAttr() is true) |
| 1403 | * with the attribute type set to AT_INDEX_ALLOCATION. Apart from that, they |
| 1404 | * are setup like directory inodes since directories are a special case of |
| 1405 | * indices ao they need to be treated in much the same way. Most importantly, |
| 1406 | * for small indices the index allocation attribute might not actually exist. |
| 1407 | * However, the index root attribute always exists but this does not need to |
| 1408 | * have an inode associated with it and this is why we define a new inode type |
| 1409 | * index. Also, like for directories, we need to have an attribute inode for |
| 1410 | * the bitmap attribute corresponding to the index allocation attribute and we |
| 1411 | * can store this in the appropriate field of the inode, just like we do for |
| 1412 | * normal directory inodes. |
| 1413 | * |
| 1414 | * Q: What locks are held when the function is called? |
| 1415 | * A: i_state has I_LOCK set, hence the inode is locked, also |
| 1416 | * i_count is set to 1, so it is not going to go away |
| 1417 | * |
| 1418 | * Return 0 on success and -errno on error. In the error case, the inode will |
| 1419 | * have had make_bad_inode() executed on it. |
| 1420 | */ |
| 1421 | static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi) |
| 1422 | { |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 1423 | loff_t bvi_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | ntfs_volume *vol = NTFS_SB(vi->i_sb); |
| 1425 | ntfs_inode *ni, *base_ni, *bni; |
| 1426 | struct inode *bvi; |
| 1427 | MFT_RECORD *m; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1428 | ATTR_RECORD *a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | ntfs_attr_search_ctx *ctx; |
| 1430 | INDEX_ROOT *ir; |
| 1431 | u8 *ir_end, *index_end; |
| 1432 | int err = 0; |
| 1433 | |
| 1434 | ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino); |
| 1435 | ntfs_init_big_inode(vi); |
| 1436 | ni = NTFS_I(vi); |
| 1437 | base_ni = NTFS_I(base_vi); |
| 1438 | /* Just mirror the values from the base inode. */ |
| 1439 | vi->i_blksize = base_vi->i_blksize; |
| 1440 | vi->i_version = base_vi->i_version; |
| 1441 | vi->i_uid = base_vi->i_uid; |
| 1442 | vi->i_gid = base_vi->i_gid; |
| 1443 | vi->i_nlink = base_vi->i_nlink; |
| 1444 | vi->i_mtime = base_vi->i_mtime; |
| 1445 | vi->i_ctime = base_vi->i_ctime; |
| 1446 | vi->i_atime = base_vi->i_atime; |
| 1447 | vi->i_generation = ni->seq_no = base_ni->seq_no; |
| 1448 | /* Set inode type to zero but preserve permissions. */ |
| 1449 | vi->i_mode = base_vi->i_mode & ~S_IFMT; |
| 1450 | /* Map the mft record for the base inode. */ |
| 1451 | m = map_mft_record(base_ni); |
| 1452 | if (IS_ERR(m)) { |
| 1453 | err = PTR_ERR(m); |
| 1454 | goto err_out; |
| 1455 | } |
| 1456 | ctx = ntfs_attr_get_search_ctx(base_ni, m); |
| 1457 | if (!ctx) { |
| 1458 | err = -ENOMEM; |
| 1459 | goto unm_err_out; |
| 1460 | } |
| 1461 | /* Find the index root attribute. */ |
| 1462 | err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len, |
| 1463 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 1464 | if (unlikely(err)) { |
| 1465 | if (err == -ENOENT) |
| 1466 | ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is " |
| 1467 | "missing."); |
| 1468 | goto unm_err_out; |
| 1469 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1470 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | /* Set up the state. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1472 | if (unlikely(a->non_resident)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident."); |
| 1474 | goto unm_err_out; |
| 1475 | } |
| 1476 | /* Ensure the attribute name is placed before the value. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1477 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 1478 | le16_to_cpu(a->data.resident.value_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed " |
| 1480 | "after the attribute value."); |
| 1481 | goto unm_err_out; |
| 1482 | } |
| 1483 | /* Compressed/encrypted/sparse index root is not allowed. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1484 | if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | ATTR_IS_SPARSE)) { |
| 1486 | ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index " |
| 1487 | "root attribute."); |
| 1488 | goto unm_err_out; |
| 1489 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1490 | ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset)); |
| 1491 | ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) { |
| 1493 | ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt."); |
| 1494 | goto unm_err_out; |
| 1495 | } |
| 1496 | index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length); |
| 1497 | if (index_end > ir_end) { |
| 1498 | ntfs_error(vi->i_sb, "Index is corrupt."); |
| 1499 | goto unm_err_out; |
| 1500 | } |
| 1501 | if (ir->type) { |
| 1502 | ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).", |
| 1503 | le32_to_cpu(ir->type)); |
| 1504 | goto unm_err_out; |
| 1505 | } |
| 1506 | ni->itype.index.collation_rule = ir->collation_rule; |
| 1507 | ntfs_debug("Index collation rule is 0x%x.", |
| 1508 | le32_to_cpu(ir->collation_rule)); |
| 1509 | ni->itype.index.block_size = le32_to_cpu(ir->index_block_size); |
| 1510 | if (ni->itype.index.block_size & (ni->itype.index.block_size - 1)) { |
| 1511 | ntfs_error(vi->i_sb, "Index block size (%u) is not a power of " |
| 1512 | "two.", ni->itype.index.block_size); |
| 1513 | goto unm_err_out; |
| 1514 | } |
| 1515 | if (ni->itype.index.block_size > PAGE_CACHE_SIZE) { |
| 1516 | ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE " |
| 1517 | "(%ld) is not supported. Sorry.", |
| 1518 | ni->itype.index.block_size, PAGE_CACHE_SIZE); |
| 1519 | err = -EOPNOTSUPP; |
| 1520 | goto unm_err_out; |
| 1521 | } |
| 1522 | if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) { |
| 1523 | ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE " |
| 1524 | "(%i) is not supported. Sorry.", |
| 1525 | ni->itype.index.block_size, NTFS_BLOCK_SIZE); |
| 1526 | err = -EOPNOTSUPP; |
| 1527 | goto unm_err_out; |
| 1528 | } |
| 1529 | ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1; |
| 1530 | /* Determine the size of a vcn in the index. */ |
| 1531 | if (vol->cluster_size <= ni->itype.index.block_size) { |
| 1532 | ni->itype.index.vcn_size = vol->cluster_size; |
| 1533 | ni->itype.index.vcn_size_bits = vol->cluster_size_bits; |
| 1534 | } else { |
| 1535 | ni->itype.index.vcn_size = vol->sector_size; |
| 1536 | ni->itype.index.vcn_size_bits = vol->sector_size_bits; |
| 1537 | } |
| 1538 | /* Check for presence of index allocation attribute. */ |
| 1539 | if (!(ir->index.flags & LARGE_INDEX)) { |
| 1540 | /* No index allocation. */ |
| 1541 | vi->i_size = ni->initialized_size = ni->allocated_size = 0; |
| 1542 | /* We are done with the mft record, so we release it. */ |
| 1543 | ntfs_attr_put_search_ctx(ctx); |
| 1544 | unmap_mft_record(base_ni); |
| 1545 | m = NULL; |
| 1546 | ctx = NULL; |
| 1547 | goto skip_large_index_stuff; |
| 1548 | } /* LARGE_INDEX: Index allocation present. Setup state. */ |
| 1549 | NInoSetIndexAllocPresent(ni); |
| 1550 | /* Find index allocation attribute. */ |
| 1551 | ntfs_attr_reinit_search_ctx(ctx); |
| 1552 | err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len, |
| 1553 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 1554 | if (unlikely(err)) { |
| 1555 | if (err == -ENOENT) |
| 1556 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is " |
| 1557 | "not present but $INDEX_ROOT " |
| 1558 | "indicated it is."); |
| 1559 | else |
| 1560 | ntfs_error(vi->i_sb, "Failed to lookup " |
| 1561 | "$INDEX_ALLOCATION attribute."); |
| 1562 | goto unm_err_out; |
| 1563 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1564 | if (!a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is " |
| 1566 | "resident."); |
| 1567 | goto unm_err_out; |
| 1568 | } |
| 1569 | /* |
| 1570 | * Ensure the attribute name is placed before the mapping pairs array. |
| 1571 | */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1572 | if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >= |
| 1573 | le16_to_cpu( |
| 1574 | a->data.non_resident.mapping_pairs_offset)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is " |
| 1576 | "placed after the mapping pairs array."); |
| 1577 | goto unm_err_out; |
| 1578 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1579 | if (a->flags & ATTR_IS_ENCRYPTED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is " |
| 1581 | "encrypted."); |
| 1582 | goto unm_err_out; |
| 1583 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1584 | if (a->flags & ATTR_IS_SPARSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse."); |
| 1586 | goto unm_err_out; |
| 1587 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1588 | if (a->flags & ATTR_COMPRESSION_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is " |
| 1590 | "compressed."); |
| 1591 | goto unm_err_out; |
| 1592 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1593 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION " |
| 1595 | "attribute has non zero lowest_vcn."); |
| 1596 | goto unm_err_out; |
| 1597 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1598 | vi->i_size = sle64_to_cpu(a->data.non_resident.data_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | ni->initialized_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1600 | a->data.non_resident.initialized_size); |
| 1601 | ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | /* |
| 1603 | * We are done with the mft record, so we release it. Otherwise |
| 1604 | * we would deadlock in ntfs_attr_iget(). |
| 1605 | */ |
| 1606 | ntfs_attr_put_search_ctx(ctx); |
| 1607 | unmap_mft_record(base_ni); |
| 1608 | m = NULL; |
| 1609 | ctx = NULL; |
| 1610 | /* Get the index bitmap attribute inode. */ |
| 1611 | bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len); |
| 1612 | if (IS_ERR(bvi)) { |
| 1613 | ntfs_error(vi->i_sb, "Failed to get bitmap attribute."); |
| 1614 | err = PTR_ERR(bvi); |
| 1615 | goto unm_err_out; |
| 1616 | } |
| 1617 | bni = NTFS_I(bvi); |
| 1618 | if (NInoCompressed(bni) || NInoEncrypted(bni) || |
| 1619 | NInoSparse(bni)) { |
| 1620 | ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or " |
| 1621 | "encrypted and/or sparse."); |
| 1622 | goto iput_unm_err_out; |
| 1623 | } |
| 1624 | /* Consistency check bitmap size vs. index allocation size. */ |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 1625 | bvi_size = i_size_read(bvi); |
| 1626 | if ((bvi_size << 3) < (vi->i_size >> ni->itype.index.block_size_bits)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for " |
Anton Altaparmakov | f50f3ac | 2004-11-19 22:16:00 +0000 | [diff] [blame] | 1628 | "index allocation (0x%llx).", bvi_size << 3, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | vi->i_size); |
| 1630 | goto iput_unm_err_out; |
| 1631 | } |
| 1632 | ni->itype.index.bmp_ino = bvi; |
| 1633 | skip_large_index_stuff: |
| 1634 | /* Setup the operations for this index inode. */ |
| 1635 | vi->i_op = NULL; |
| 1636 | vi->i_fop = NULL; |
| 1637 | vi->i_mapping->a_ops = &ntfs_mst_aops; |
| 1638 | vi->i_blocks = ni->allocated_size >> 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | /* |
| 1640 | * Make sure the base inode doesn't go away and attach it to the |
| 1641 | * index inode. |
| 1642 | */ |
| 1643 | igrab(base_vi); |
| 1644 | ni->ext.base_ntfs_ino = base_ni; |
| 1645 | ni->nr_extents = -1; |
| 1646 | |
| 1647 | ntfs_debug("Done."); |
| 1648 | return 0; |
| 1649 | |
| 1650 | iput_unm_err_out: |
| 1651 | iput(bvi); |
| 1652 | unm_err_out: |
| 1653 | if (!err) |
| 1654 | err = -EIO; |
| 1655 | if (ctx) |
| 1656 | ntfs_attr_put_search_ctx(ctx); |
| 1657 | if (m) |
| 1658 | unmap_mft_record(base_ni); |
| 1659 | err_out: |
| 1660 | ntfs_error(vi->i_sb, "Failed with error code %i while reading index " |
| 1661 | "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino, |
| 1662 | ni->name_len); |
| 1663 | make_bad_inode(vi); |
| 1664 | if (err != -EOPNOTSUPP && err != -ENOMEM) |
| 1665 | NVolSetErrors(vol); |
| 1666 | return err; |
| 1667 | } |
| 1668 | |
| 1669 | /** |
| 1670 | * ntfs_read_inode_mount - special read_inode for mount time use only |
| 1671 | * @vi: inode to read |
| 1672 | * |
| 1673 | * Read inode FILE_MFT at mount time, only called with super_block lock |
| 1674 | * held from within the read_super() code path. |
| 1675 | * |
| 1676 | * This function exists because when it is called the page cache for $MFT/$DATA |
| 1677 | * is not initialized and hence we cannot get at the contents of mft records |
| 1678 | * by calling map_mft_record*(). |
| 1679 | * |
| 1680 | * Further it needs to cope with the circular references problem, i.e. cannot |
| 1681 | * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because |
| 1682 | * we do not know where the other extent mft records are yet and again, because |
| 1683 | * we cannot call map_mft_record*() yet. Obviously this applies only when an |
| 1684 | * attribute list is actually present in $MFT inode. |
| 1685 | * |
| 1686 | * We solve these problems by starting with the $DATA attribute before anything |
| 1687 | * else and iterating using ntfs_attr_lookup($DATA) over all extents. As each |
| 1688 | * extent is found, we ntfs_mapping_pairs_decompress() including the implied |
| 1689 | * ntfs_runlists_merge(). Each step of the iteration necessarily provides |
| 1690 | * sufficient information for the next step to complete. |
| 1691 | * |
| 1692 | * This should work but there are two possible pit falls (see inline comments |
| 1693 | * below), but only time will tell if they are real pits or just smoke... |
| 1694 | */ |
| 1695 | int ntfs_read_inode_mount(struct inode *vi) |
| 1696 | { |
| 1697 | VCN next_vcn, last_vcn, highest_vcn; |
| 1698 | s64 block; |
| 1699 | struct super_block *sb = vi->i_sb; |
| 1700 | ntfs_volume *vol = NTFS_SB(sb); |
| 1701 | struct buffer_head *bh; |
| 1702 | ntfs_inode *ni; |
| 1703 | MFT_RECORD *m = NULL; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1704 | ATTR_RECORD *a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | ntfs_attr_search_ctx *ctx; |
| 1706 | unsigned int i, nr_blocks; |
| 1707 | int err; |
| 1708 | |
| 1709 | ntfs_debug("Entering."); |
| 1710 | |
| 1711 | /* Initialize the ntfs specific part of @vi. */ |
| 1712 | ntfs_init_big_inode(vi); |
| 1713 | |
| 1714 | ni = NTFS_I(vi); |
| 1715 | |
| 1716 | /* Setup the data attribute. It is special as it is mst protected. */ |
| 1717 | NInoSetNonResident(ni); |
| 1718 | NInoSetMstProtected(ni); |
Anton Altaparmakov | c002f42 | 2005-02-03 12:02:56 +0000 | [diff] [blame] | 1719 | NInoSetSparseDisabled(ni); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | ni->type = AT_DATA; |
| 1721 | ni->name = NULL; |
| 1722 | ni->name_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | /* |
| 1724 | * This sets up our little cheat allowing us to reuse the async read io |
| 1725 | * completion handler for directories. |
| 1726 | */ |
| 1727 | ni->itype.index.block_size = vol->mft_record_size; |
| 1728 | ni->itype.index.block_size_bits = vol->mft_record_size_bits; |
| 1729 | |
| 1730 | /* Very important! Needed to be able to call map_mft_record*(). */ |
| 1731 | vol->mft_ino = vi; |
| 1732 | |
| 1733 | /* Allocate enough memory to read the first mft record. */ |
| 1734 | if (vol->mft_record_size > 64 * 1024) { |
| 1735 | ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).", |
| 1736 | vol->mft_record_size); |
| 1737 | goto err_out; |
| 1738 | } |
| 1739 | i = vol->mft_record_size; |
| 1740 | if (i < sb->s_blocksize) |
| 1741 | i = sb->s_blocksize; |
| 1742 | m = (MFT_RECORD*)ntfs_malloc_nofs(i); |
| 1743 | if (!m) { |
| 1744 | ntfs_error(sb, "Failed to allocate buffer for $MFT record 0."); |
| 1745 | goto err_out; |
| 1746 | } |
| 1747 | |
| 1748 | /* Determine the first block of the $MFT/$DATA attribute. */ |
| 1749 | block = vol->mft_lcn << vol->cluster_size_bits >> |
| 1750 | sb->s_blocksize_bits; |
| 1751 | nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits; |
| 1752 | if (!nr_blocks) |
| 1753 | nr_blocks = 1; |
| 1754 | |
| 1755 | /* Load $MFT/$DATA's first mft record. */ |
| 1756 | for (i = 0; i < nr_blocks; i++) { |
| 1757 | bh = sb_bread(sb, block++); |
| 1758 | if (!bh) { |
| 1759 | ntfs_error(sb, "Device read failed."); |
| 1760 | goto err_out; |
| 1761 | } |
| 1762 | memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data, |
| 1763 | sb->s_blocksize); |
| 1764 | brelse(bh); |
| 1765 | } |
| 1766 | |
| 1767 | /* Apply the mst fixups. */ |
| 1768 | if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) { |
| 1769 | /* FIXME: Try to use the $MFTMirr now. */ |
| 1770 | ntfs_error(sb, "MST fixup failed. $MFT is corrupt."); |
| 1771 | goto err_out; |
| 1772 | } |
| 1773 | |
| 1774 | /* Need this to sanity check attribute list references to $MFT. */ |
| 1775 | vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number); |
| 1776 | |
| 1777 | /* Provides readpage() and sync_page() for map_mft_record(). */ |
| 1778 | vi->i_mapping->a_ops = &ntfs_mst_aops; |
| 1779 | |
| 1780 | ctx = ntfs_attr_get_search_ctx(ni, m); |
| 1781 | if (!ctx) { |
| 1782 | err = -ENOMEM; |
| 1783 | goto err_out; |
| 1784 | } |
| 1785 | |
| 1786 | /* Find the attribute list attribute if present. */ |
| 1787 | err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx); |
| 1788 | if (err) { |
| 1789 | if (unlikely(err != -ENOENT)) { |
| 1790 | ntfs_error(sb, "Failed to lookup attribute list " |
| 1791 | "attribute. You should run chkdsk."); |
| 1792 | goto put_err_out; |
| 1793 | } |
| 1794 | } else /* if (!err) */ { |
| 1795 | ATTR_LIST_ENTRY *al_entry, *next_al_entry; |
| 1796 | u8 *al_end; |
| 1797 | |
| 1798 | ntfs_debug("Attribute list attribute found in $MFT."); |
| 1799 | NInoSetAttrList(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1800 | a = ctx->attr; |
| 1801 | if (a->flags & ATTR_IS_ENCRYPTED || |
| 1802 | a->flags & ATTR_COMPRESSION_MASK || |
| 1803 | a->flags & ATTR_IS_SPARSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | ntfs_error(sb, "Attribute list attribute is " |
| 1805 | "compressed/encrypted/sparse. Not " |
| 1806 | "allowed. $MFT is corrupt. You should " |
| 1807 | "run chkdsk."); |
| 1808 | goto put_err_out; |
| 1809 | } |
| 1810 | /* Now allocate memory for the attribute list. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1811 | ni->attr_list_size = (u32)ntfs_attr_size(a); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size); |
| 1813 | if (!ni->attr_list) { |
| 1814 | ntfs_error(sb, "Not enough memory to allocate buffer " |
| 1815 | "for attribute list."); |
| 1816 | goto put_err_out; |
| 1817 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1818 | if (a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | NInoSetAttrListNonResident(ni); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1820 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | ntfs_error(sb, "Attribute list has non zero " |
| 1822 | "lowest_vcn. $MFT is corrupt. " |
| 1823 | "You should run chkdsk."); |
| 1824 | goto put_err_out; |
| 1825 | } |
| 1826 | /* Setup the runlist. */ |
| 1827 | ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol, |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1828 | a, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | if (IS_ERR(ni->attr_list_rl.rl)) { |
| 1830 | err = PTR_ERR(ni->attr_list_rl.rl); |
| 1831 | ni->attr_list_rl.rl = NULL; |
| 1832 | ntfs_error(sb, "Mapping pairs decompression " |
| 1833 | "failed with error code %i.", |
| 1834 | -err); |
| 1835 | goto put_err_out; |
| 1836 | } |
| 1837 | /* Now load the attribute list. */ |
| 1838 | if ((err = load_attribute_list(vol, &ni->attr_list_rl, |
| 1839 | ni->attr_list, ni->attr_list_size, |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1840 | sle64_to_cpu(a->data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | non_resident.initialized_size)))) { |
| 1842 | ntfs_error(sb, "Failed to load attribute list " |
| 1843 | "attribute with error code %i.", |
| 1844 | -err); |
| 1845 | goto put_err_out; |
| 1846 | } |
| 1847 | } else /* if (!ctx.attr->non_resident) */ { |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1848 | if ((u8*)a + le16_to_cpu( |
| 1849 | a->data.resident.value_offset) + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | le32_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1851 | a->data.resident.value_length) > |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | (u8*)ctx->mrec + vol->mft_record_size) { |
| 1853 | ntfs_error(sb, "Corrupt attribute list " |
| 1854 | "attribute."); |
| 1855 | goto put_err_out; |
| 1856 | } |
| 1857 | /* Now copy the attribute list. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1858 | memcpy(ni->attr_list, (u8*)a + le16_to_cpu( |
| 1859 | a->data.resident.value_offset), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | le32_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1861 | a->data.resident.value_length)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | } |
| 1863 | /* The attribute list is now setup in memory. */ |
| 1864 | /* |
| 1865 | * FIXME: I don't know if this case is actually possible. |
| 1866 | * According to logic it is not possible but I have seen too |
| 1867 | * many weird things in MS software to rely on logic... Thus we |
| 1868 | * perform a manual search and make sure the first $MFT/$DATA |
| 1869 | * extent is in the base inode. If it is not we abort with an |
| 1870 | * error and if we ever see a report of this error we will need |
| 1871 | * to do some magic in order to have the necessary mft record |
| 1872 | * loaded and in the right place in the page cache. But |
| 1873 | * hopefully logic will prevail and this never happens... |
| 1874 | */ |
| 1875 | al_entry = (ATTR_LIST_ENTRY*)ni->attr_list; |
| 1876 | al_end = (u8*)al_entry + ni->attr_list_size; |
| 1877 | for (;; al_entry = next_al_entry) { |
| 1878 | /* Out of bounds check. */ |
| 1879 | if ((u8*)al_entry < ni->attr_list || |
| 1880 | (u8*)al_entry > al_end) |
| 1881 | goto em_put_err_out; |
| 1882 | /* Catch the end of the attribute list. */ |
| 1883 | if ((u8*)al_entry == al_end) |
| 1884 | goto em_put_err_out; |
| 1885 | if (!al_entry->length) |
| 1886 | goto em_put_err_out; |
| 1887 | if ((u8*)al_entry + 6 > al_end || (u8*)al_entry + |
| 1888 | le16_to_cpu(al_entry->length) > al_end) |
| 1889 | goto em_put_err_out; |
| 1890 | next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry + |
| 1891 | le16_to_cpu(al_entry->length)); |
| 1892 | if (le32_to_cpu(al_entry->type) > |
| 1893 | const_le32_to_cpu(AT_DATA)) |
| 1894 | goto em_put_err_out; |
| 1895 | if (AT_DATA != al_entry->type) |
| 1896 | continue; |
| 1897 | /* We want an unnamed attribute. */ |
| 1898 | if (al_entry->name_length) |
| 1899 | goto em_put_err_out; |
| 1900 | /* Want the first entry, i.e. lowest_vcn == 0. */ |
| 1901 | if (al_entry->lowest_vcn) |
| 1902 | goto em_put_err_out; |
| 1903 | /* First entry has to be in the base mft record. */ |
| 1904 | if (MREF_LE(al_entry->mft_reference) != vi->i_ino) { |
| 1905 | /* MFT references do not match, logic fails. */ |
| 1906 | ntfs_error(sb, "BUG: The first $DATA extent " |
| 1907 | "of $MFT is not in the base " |
| 1908 | "mft record. Please report " |
| 1909 | "you saw this message to " |
| 1910 | "linux-ntfs-dev@lists." |
| 1911 | "sourceforge.net"); |
| 1912 | goto put_err_out; |
| 1913 | } else { |
| 1914 | /* Sequence numbers must match. */ |
| 1915 | if (MSEQNO_LE(al_entry->mft_reference) != |
| 1916 | ni->seq_no) |
| 1917 | goto em_put_err_out; |
| 1918 | /* Got it. All is ok. We can stop now. */ |
| 1919 | break; |
| 1920 | } |
| 1921 | } |
| 1922 | } |
| 1923 | |
| 1924 | ntfs_attr_reinit_search_ctx(ctx); |
| 1925 | |
| 1926 | /* Now load all attribute extents. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1927 | a = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | next_vcn = last_vcn = highest_vcn = 0; |
| 1929 | while (!(err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, next_vcn, NULL, 0, |
| 1930 | ctx))) { |
| 1931 | runlist_element *nrl; |
| 1932 | |
| 1933 | /* Cache the current attribute. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1934 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | /* $MFT must be non-resident. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1936 | if (!a->non_resident) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | ntfs_error(sb, "$MFT must be non-resident but a " |
| 1938 | "resident extent was found. $MFT is " |
| 1939 | "corrupt. Run chkdsk."); |
| 1940 | goto put_err_out; |
| 1941 | } |
| 1942 | /* $MFT must be uncompressed and unencrypted. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1943 | if (a->flags & ATTR_COMPRESSION_MASK || |
| 1944 | a->flags & ATTR_IS_ENCRYPTED || |
| 1945 | a->flags & ATTR_IS_SPARSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | ntfs_error(sb, "$MFT must be uncompressed, " |
| 1947 | "non-sparse, and unencrypted but a " |
| 1948 | "compressed/sparse/encrypted extent " |
| 1949 | "was found. $MFT is corrupt. Run " |
| 1950 | "chkdsk."); |
| 1951 | goto put_err_out; |
| 1952 | } |
| 1953 | /* |
| 1954 | * Decompress the mapping pairs array of this extent and merge |
| 1955 | * the result into the existing runlist. No need for locking |
| 1956 | * as we have exclusive access to the inode at this time and we |
| 1957 | * are a mount in progress task, too. |
| 1958 | */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1959 | nrl = ntfs_mapping_pairs_decompress(vol, a, ni->runlist.rl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | if (IS_ERR(nrl)) { |
| 1961 | ntfs_error(sb, "ntfs_mapping_pairs_decompress() " |
| 1962 | "failed with error code %ld. $MFT is " |
| 1963 | "corrupt.", PTR_ERR(nrl)); |
| 1964 | goto put_err_out; |
| 1965 | } |
| 1966 | ni->runlist.rl = nrl; |
| 1967 | |
| 1968 | /* Are we in the first extent? */ |
| 1969 | if (!next_vcn) { |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1970 | if (a->data.non_resident.lowest_vcn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | ntfs_error(sb, "First extent of $DATA " |
| 1972 | "attribute has non zero " |
| 1973 | "lowest_vcn. $MFT is corrupt. " |
| 1974 | "You should run chkdsk."); |
| 1975 | goto put_err_out; |
| 1976 | } |
| 1977 | /* Get the last vcn in the $DATA attribute. */ |
| 1978 | last_vcn = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1979 | a->data.non_resident.allocated_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | >> vol->cluster_size_bits; |
| 1981 | /* Fill in the inode size. */ |
| 1982 | vi->i_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1983 | a->data.non_resident.data_size); |
| 1984 | ni->initialized_size = sle64_to_cpu( |
| 1985 | a->data.non_resident.initialized_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | ni->allocated_size = sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 1987 | a->data.non_resident.allocated_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | /* |
| 1989 | * Verify the number of mft records does not exceed |
| 1990 | * 2^32 - 1. |
| 1991 | */ |
| 1992 | if ((vi->i_size >> vol->mft_record_size_bits) >= |
| 1993 | (1ULL << 32)) { |
| 1994 | ntfs_error(sb, "$MFT is too big! Aborting."); |
| 1995 | goto put_err_out; |
| 1996 | } |
| 1997 | /* |
| 1998 | * We have got the first extent of the runlist for |
| 1999 | * $MFT which means it is now relatively safe to call |
| 2000 | * the normal ntfs_read_inode() function. |
| 2001 | * Complete reading the inode, this will actually |
| 2002 | * re-read the mft record for $MFT, this time entering |
| 2003 | * it into the page cache with which we complete the |
| 2004 | * kick start of the volume. It should be safe to do |
| 2005 | * this now as the first extent of $MFT/$DATA is |
| 2006 | * already known and we would hope that we don't need |
| 2007 | * further extents in order to find the other |
| 2008 | * attributes belonging to $MFT. Only time will tell if |
| 2009 | * this is really the case. If not we will have to play |
| 2010 | * magic at this point, possibly duplicating a lot of |
| 2011 | * ntfs_read_inode() at this point. We will need to |
| 2012 | * ensure we do enough of its work to be able to call |
| 2013 | * ntfs_read_inode() on extents of $MFT/$DATA. But lets |
| 2014 | * hope this never happens... |
| 2015 | */ |
| 2016 | ntfs_read_locked_inode(vi); |
| 2017 | if (is_bad_inode(vi)) { |
| 2018 | ntfs_error(sb, "ntfs_read_inode() of $MFT " |
| 2019 | "failed. BUG or corrupt $MFT. " |
| 2020 | "Run chkdsk and if no errors " |
| 2021 | "are found, please report you " |
| 2022 | "saw this message to " |
| 2023 | "linux-ntfs-dev@lists." |
| 2024 | "sourceforge.net"); |
| 2025 | ntfs_attr_put_search_ctx(ctx); |
| 2026 | /* Revert to the safe super operations. */ |
| 2027 | ntfs_free(m); |
| 2028 | return -1; |
| 2029 | } |
| 2030 | /* |
| 2031 | * Re-initialize some specifics about $MFT's inode as |
| 2032 | * ntfs_read_inode() will have set up the default ones. |
| 2033 | */ |
| 2034 | /* Set uid and gid to root. */ |
| 2035 | vi->i_uid = vi->i_gid = 0; |
| 2036 | /* Regular file. No access for anyone. */ |
| 2037 | vi->i_mode = S_IFREG; |
| 2038 | /* No VFS initiated operations allowed for $MFT. */ |
| 2039 | vi->i_op = &ntfs_empty_inode_ops; |
| 2040 | vi->i_fop = &ntfs_empty_file_ops; |
| 2041 | } |
| 2042 | |
| 2043 | /* Get the lowest vcn for the next extent. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2044 | highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | next_vcn = highest_vcn + 1; |
| 2046 | |
| 2047 | /* Only one extent or error, which we catch below. */ |
| 2048 | if (next_vcn <= 0) |
| 2049 | break; |
| 2050 | |
| 2051 | /* Avoid endless loops due to corruption. */ |
| 2052 | if (next_vcn < sle64_to_cpu( |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2053 | a->data.non_resident.lowest_vcn)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | ntfs_error(sb, "$MFT has corrupt attribute list " |
| 2055 | "attribute. Run chkdsk."); |
| 2056 | goto put_err_out; |
| 2057 | } |
| 2058 | } |
| 2059 | if (err != -ENOENT) { |
| 2060 | ntfs_error(sb, "Failed to lookup $MFT/$DATA attribute extent. " |
| 2061 | "$MFT is corrupt. Run chkdsk."); |
| 2062 | goto put_err_out; |
| 2063 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2064 | if (!a) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | ntfs_error(sb, "$MFT/$DATA attribute not found. $MFT is " |
| 2066 | "corrupt. Run chkdsk."); |
| 2067 | goto put_err_out; |
| 2068 | } |
| 2069 | if (highest_vcn && highest_vcn != last_vcn - 1) { |
| 2070 | ntfs_error(sb, "Failed to load the complete runlist for " |
| 2071 | "$MFT/$DATA. Driver bug or corrupt $MFT. " |
| 2072 | "Run chkdsk."); |
| 2073 | ntfs_debug("highest_vcn = 0x%llx, last_vcn - 1 = 0x%llx", |
| 2074 | (unsigned long long)highest_vcn, |
| 2075 | (unsigned long long)last_vcn - 1); |
| 2076 | goto put_err_out; |
| 2077 | } |
| 2078 | ntfs_attr_put_search_ctx(ctx); |
| 2079 | ntfs_debug("Done."); |
| 2080 | ntfs_free(m); |
| 2081 | return 0; |
| 2082 | |
| 2083 | em_put_err_out: |
| 2084 | ntfs_error(sb, "Couldn't find first extent of $DATA attribute in " |
| 2085 | "attribute list. $MFT is corrupt. Run chkdsk."); |
| 2086 | put_err_out: |
| 2087 | ntfs_attr_put_search_ctx(ctx); |
| 2088 | err_out: |
| 2089 | ntfs_error(sb, "Failed. Marking inode as bad."); |
| 2090 | make_bad_inode(vi); |
| 2091 | ntfs_free(m); |
| 2092 | return -1; |
| 2093 | } |
| 2094 | |
| 2095 | /** |
| 2096 | * ntfs_put_inode - handler for when the inode reference count is decremented |
| 2097 | * @vi: vfs inode |
| 2098 | * |
| 2099 | * The VFS calls ntfs_put_inode() every time the inode reference count (i_count) |
| 2100 | * is about to be decremented (but before the decrement itself. |
| 2101 | * |
| 2102 | * If the inode @vi is a directory with two references, one of which is being |
| 2103 | * dropped, we need to put the attribute inode for the directory index bitmap, |
| 2104 | * if it is present, otherwise the directory inode would remain pinned for |
| 2105 | * ever. |
| 2106 | */ |
| 2107 | void ntfs_put_inode(struct inode *vi) |
| 2108 | { |
| 2109 | if (S_ISDIR(vi->i_mode) && atomic_read(&vi->i_count) == 2) { |
| 2110 | ntfs_inode *ni = NTFS_I(vi); |
| 2111 | if (NInoIndexAllocPresent(ni)) { |
| 2112 | struct inode *bvi = NULL; |
| 2113 | down(&vi->i_sem); |
| 2114 | if (atomic_read(&vi->i_count) == 2) { |
| 2115 | bvi = ni->itype.index.bmp_ino; |
| 2116 | if (bvi) |
| 2117 | ni->itype.index.bmp_ino = NULL; |
| 2118 | } |
| 2119 | up(&vi->i_sem); |
| 2120 | if (bvi) |
| 2121 | iput(bvi); |
| 2122 | } |
| 2123 | } |
| 2124 | } |
| 2125 | |
| 2126 | static void __ntfs_clear_inode(ntfs_inode *ni) |
| 2127 | { |
| 2128 | /* Free all alocated memory. */ |
| 2129 | down_write(&ni->runlist.lock); |
| 2130 | if (ni->runlist.rl) { |
| 2131 | ntfs_free(ni->runlist.rl); |
| 2132 | ni->runlist.rl = NULL; |
| 2133 | } |
| 2134 | up_write(&ni->runlist.lock); |
| 2135 | |
| 2136 | if (ni->attr_list) { |
| 2137 | ntfs_free(ni->attr_list); |
| 2138 | ni->attr_list = NULL; |
| 2139 | } |
| 2140 | |
| 2141 | down_write(&ni->attr_list_rl.lock); |
| 2142 | if (ni->attr_list_rl.rl) { |
| 2143 | ntfs_free(ni->attr_list_rl.rl); |
| 2144 | ni->attr_list_rl.rl = NULL; |
| 2145 | } |
| 2146 | up_write(&ni->attr_list_rl.lock); |
| 2147 | |
| 2148 | if (ni->name_len && ni->name != I30) { |
| 2149 | /* Catch bugs... */ |
| 2150 | BUG_ON(!ni->name); |
| 2151 | kfree(ni->name); |
| 2152 | } |
| 2153 | } |
| 2154 | |
| 2155 | void ntfs_clear_extent_inode(ntfs_inode *ni) |
| 2156 | { |
| 2157 | ntfs_debug("Entering for inode 0x%lx.", ni->mft_no); |
| 2158 | |
| 2159 | BUG_ON(NInoAttr(ni)); |
| 2160 | BUG_ON(ni->nr_extents != -1); |
| 2161 | |
| 2162 | #ifdef NTFS_RW |
| 2163 | if (NInoDirty(ni)) { |
| 2164 | if (!is_bad_inode(VFS_I(ni->ext.base_ntfs_ino))) |
| 2165 | ntfs_error(ni->vol->sb, "Clearing dirty extent inode! " |
| 2166 | "Losing data! This is a BUG!!!"); |
| 2167 | // FIXME: Do something!!! |
| 2168 | } |
| 2169 | #endif /* NTFS_RW */ |
| 2170 | |
| 2171 | __ntfs_clear_inode(ni); |
| 2172 | |
| 2173 | /* Bye, bye... */ |
| 2174 | ntfs_destroy_extent_inode(ni); |
| 2175 | } |
| 2176 | |
| 2177 | /** |
| 2178 | * ntfs_clear_big_inode - clean up the ntfs specific part of an inode |
| 2179 | * @vi: vfs inode pending annihilation |
| 2180 | * |
| 2181 | * When the VFS is going to remove an inode from memory, ntfs_clear_big_inode() |
| 2182 | * is called, which deallocates all memory belonging to the NTFS specific part |
| 2183 | * of the inode and returns. |
| 2184 | * |
| 2185 | * If the MFT record is dirty, we commit it before doing anything else. |
| 2186 | */ |
| 2187 | void ntfs_clear_big_inode(struct inode *vi) |
| 2188 | { |
| 2189 | ntfs_inode *ni = NTFS_I(vi); |
| 2190 | |
| 2191 | /* |
| 2192 | * If the inode @vi is an index inode we need to put the attribute |
| 2193 | * inode for the index bitmap, if it is present, otherwise the index |
| 2194 | * inode would disappear and the attribute inode for the index bitmap |
| 2195 | * would no longer be referenced from anywhere and thus it would remain |
| 2196 | * pinned for ever. |
| 2197 | */ |
| 2198 | if (NInoAttr(ni) && (ni->type == AT_INDEX_ALLOCATION) && |
| 2199 | NInoIndexAllocPresent(ni) && ni->itype.index.bmp_ino) { |
| 2200 | iput(ni->itype.index.bmp_ino); |
| 2201 | ni->itype.index.bmp_ino = NULL; |
| 2202 | } |
| 2203 | #ifdef NTFS_RW |
| 2204 | if (NInoDirty(ni)) { |
| 2205 | BOOL was_bad = (is_bad_inode(vi)); |
| 2206 | |
| 2207 | /* Committing the inode also commits all extent inodes. */ |
| 2208 | ntfs_commit_inode(vi); |
| 2209 | |
| 2210 | if (!was_bad && (is_bad_inode(vi) || NInoDirty(ni))) { |
| 2211 | ntfs_error(vi->i_sb, "Failed to commit dirty inode " |
| 2212 | "0x%lx. Losing data!", vi->i_ino); |
| 2213 | // FIXME: Do something!!! |
| 2214 | } |
| 2215 | } |
| 2216 | #endif /* NTFS_RW */ |
| 2217 | |
| 2218 | /* No need to lock at this stage as no one else has a reference. */ |
| 2219 | if (ni->nr_extents > 0) { |
| 2220 | int i; |
| 2221 | |
| 2222 | for (i = 0; i < ni->nr_extents; i++) |
| 2223 | ntfs_clear_extent_inode(ni->ext.extent_ntfs_inos[i]); |
| 2224 | kfree(ni->ext.extent_ntfs_inos); |
| 2225 | } |
| 2226 | |
| 2227 | __ntfs_clear_inode(ni); |
| 2228 | |
| 2229 | if (NInoAttr(ni)) { |
| 2230 | /* Release the base inode if we are holding it. */ |
| 2231 | if (ni->nr_extents == -1) { |
| 2232 | iput(VFS_I(ni->ext.base_ntfs_ino)); |
| 2233 | ni->nr_extents = 0; |
| 2234 | ni->ext.base_ntfs_ino = NULL; |
| 2235 | } |
| 2236 | } |
| 2237 | return; |
| 2238 | } |
| 2239 | |
| 2240 | /** |
| 2241 | * ntfs_show_options - show mount options in /proc/mounts |
| 2242 | * @sf: seq_file in which to write our mount options |
| 2243 | * @mnt: vfs mount whose mount options to display |
| 2244 | * |
| 2245 | * Called by the VFS once for each mounted ntfs volume when someone reads |
| 2246 | * /proc/mounts in order to display the NTFS specific mount options of each |
| 2247 | * mount. The mount options of the vfs mount @mnt are written to the seq file |
| 2248 | * @sf and success is returned. |
| 2249 | */ |
| 2250 | int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt) |
| 2251 | { |
| 2252 | ntfs_volume *vol = NTFS_SB(mnt->mnt_sb); |
| 2253 | int i; |
| 2254 | |
| 2255 | seq_printf(sf, ",uid=%i", vol->uid); |
| 2256 | seq_printf(sf, ",gid=%i", vol->gid); |
| 2257 | if (vol->fmask == vol->dmask) |
| 2258 | seq_printf(sf, ",umask=0%o", vol->fmask); |
| 2259 | else { |
| 2260 | seq_printf(sf, ",fmask=0%o", vol->fmask); |
| 2261 | seq_printf(sf, ",dmask=0%o", vol->dmask); |
| 2262 | } |
| 2263 | seq_printf(sf, ",nls=%s", vol->nls_map->charset); |
| 2264 | if (NVolCaseSensitive(vol)) |
| 2265 | seq_printf(sf, ",case_sensitive"); |
| 2266 | if (NVolShowSystemFiles(vol)) |
| 2267 | seq_printf(sf, ",show_sys_files"); |
Anton Altaparmakov | c002f42 | 2005-02-03 12:02:56 +0000 | [diff] [blame] | 2268 | if (!NVolSparseEnabled(vol)) |
| 2269 | seq_printf(sf, ",disable_sparse"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | for (i = 0; on_errors_arr[i].val; i++) { |
| 2271 | if (on_errors_arr[i].val & vol->on_errors) |
| 2272 | seq_printf(sf, ",errors=%s", on_errors_arr[i].str); |
| 2273 | } |
| 2274 | seq_printf(sf, ",mft_zone_multiplier=%i", vol->mft_zone_multiplier); |
| 2275 | return 0; |
| 2276 | } |
| 2277 | |
| 2278 | #ifdef NTFS_RW |
| 2279 | |
| 2280 | /** |
| 2281 | * ntfs_truncate - called when the i_size of an ntfs inode is changed |
| 2282 | * @vi: inode for which the i_size was changed |
| 2283 | * |
| 2284 | * We do not support i_size changes yet. |
| 2285 | * |
| 2286 | * The kernel guarantees that @vi is a regular file (S_ISREG() is true) and |
| 2287 | * that the change is allowed. |
| 2288 | * |
| 2289 | * This implies for us that @vi is a file inode rather than a directory, index, |
| 2290 | * or attribute inode as well as that @vi is a base inode. |
| 2291 | * |
| 2292 | * Returns 0 on success or -errno on error. |
| 2293 | * |
| 2294 | * Called with ->i_sem held. In all but one case ->i_alloc_sem is held for |
| 2295 | * writing. The only case where ->i_alloc_sem is not held is |
| 2296 | * mm/filemap.c::generic_file_buffered_write() where vmtruncate() is called |
| 2297 | * with the current i_size as the offset which means that it is a noop as far |
| 2298 | * as ntfs_truncate() is concerned. |
| 2299 | */ |
| 2300 | int ntfs_truncate(struct inode *vi) |
| 2301 | { |
| 2302 | ntfs_inode *ni = NTFS_I(vi); |
| 2303 | ntfs_volume *vol = ni->vol; |
| 2304 | ntfs_attr_search_ctx *ctx; |
| 2305 | MFT_RECORD *m; |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2306 | ATTR_RECORD *a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | const char *te = " Leaving file length out of sync with i_size."; |
| 2308 | int err; |
| 2309 | |
| 2310 | ntfs_debug("Entering for inode 0x%lx.", vi->i_ino); |
| 2311 | BUG_ON(NInoAttr(ni)); |
| 2312 | BUG_ON(ni->nr_extents < 0); |
| 2313 | m = map_mft_record(ni); |
| 2314 | if (IS_ERR(m)) { |
| 2315 | err = PTR_ERR(m); |
| 2316 | ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx " |
| 2317 | "(error code %d).%s", vi->i_ino, err, te); |
| 2318 | ctx = NULL; |
| 2319 | m = NULL; |
| 2320 | goto err_out; |
| 2321 | } |
| 2322 | ctx = ntfs_attr_get_search_ctx(ni, m); |
| 2323 | if (unlikely(!ctx)) { |
| 2324 | ntfs_error(vi->i_sb, "Failed to allocate a search context for " |
| 2325 | "inode 0x%lx (not enough memory).%s", |
| 2326 | vi->i_ino, te); |
| 2327 | err = -ENOMEM; |
| 2328 | goto err_out; |
| 2329 | } |
| 2330 | err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len, |
| 2331 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 2332 | if (unlikely(err)) { |
| 2333 | if (err == -ENOENT) |
| 2334 | ntfs_error(vi->i_sb, "Open attribute is missing from " |
| 2335 | "mft record. Inode 0x%lx is corrupt. " |
| 2336 | "Run chkdsk.", vi->i_ino); |
| 2337 | else |
| 2338 | ntfs_error(vi->i_sb, "Failed to lookup attribute in " |
| 2339 | "inode 0x%lx (error code %d).", |
| 2340 | vi->i_ino, err); |
| 2341 | goto err_out; |
| 2342 | } |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2343 | a = ctx->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | /* If the size has not changed there is nothing to do. */ |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2345 | if (ntfs_attr_size(a) == i_size_read(vi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | goto done; |
| 2347 | // TODO: Implement the truncate... |
| 2348 | ntfs_error(vi->i_sb, "Inode size has changed but this is not " |
| 2349 | "implemented yet. Resetting inode size to old value. " |
| 2350 | " This is most likely a bug in the ntfs driver!"); |
Anton Altaparmakov | 5ae9fcf | 2005-03-02 17:03:24 +0000 | [diff] [blame] | 2351 | i_size_write(vi, ntfs_attr_size(a)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | done: |
| 2353 | ntfs_attr_put_search_ctx(ctx); |
| 2354 | unmap_mft_record(ni); |
| 2355 | NInoClearTruncateFailed(ni); |
| 2356 | ntfs_debug("Done."); |
| 2357 | return 0; |
| 2358 | err_out: |
| 2359 | if (err != -ENOMEM) { |
| 2360 | NVolSetErrors(vol); |
| 2361 | make_bad_inode(vi); |
| 2362 | } |
| 2363 | if (ctx) |
| 2364 | ntfs_attr_put_search_ctx(ctx); |
| 2365 | if (m) |
| 2366 | unmap_mft_record(ni); |
| 2367 | NInoSetTruncateFailed(ni); |
| 2368 | return err; |
| 2369 | } |
| 2370 | |
| 2371 | /** |
| 2372 | * ntfs_truncate_vfs - wrapper for ntfs_truncate() that has no return value |
| 2373 | * @vi: inode for which the i_size was changed |
| 2374 | * |
| 2375 | * Wrapper for ntfs_truncate() that has no return value. |
| 2376 | * |
| 2377 | * See ntfs_truncate() description above for details. |
| 2378 | */ |
| 2379 | void ntfs_truncate_vfs(struct inode *vi) { |
| 2380 | ntfs_truncate(vi); |
| 2381 | } |
| 2382 | |
| 2383 | /** |
| 2384 | * ntfs_setattr - called from notify_change() when an attribute is being changed |
| 2385 | * @dentry: dentry whose attributes to change |
| 2386 | * @attr: structure describing the attributes and the changes |
| 2387 | * |
| 2388 | * We have to trap VFS attempts to truncate the file described by @dentry as |
| 2389 | * soon as possible, because we do not implement changes in i_size yet. So we |
| 2390 | * abort all i_size changes here. |
| 2391 | * |
| 2392 | * We also abort all changes of user, group, and mode as we do not implement |
| 2393 | * the NTFS ACLs yet. |
| 2394 | * |
| 2395 | * Called with ->i_sem held. For the ATTR_SIZE (i.e. ->truncate) case, also |
| 2396 | * called with ->i_alloc_sem held for writing. |
| 2397 | * |
| 2398 | * Basically this is a copy of generic notify_change() and inode_setattr() |
| 2399 | * functionality, except we intercept and abort changes in i_size. |
| 2400 | */ |
| 2401 | int ntfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 2402 | { |
| 2403 | struct inode *vi = dentry->d_inode; |
| 2404 | int err; |
| 2405 | unsigned int ia_valid = attr->ia_valid; |
| 2406 | |
| 2407 | err = inode_change_ok(vi, attr); |
| 2408 | if (err) |
| 2409 | return err; |
| 2410 | |
| 2411 | /* We do not support NTFS ACLs yet. */ |
| 2412 | if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) { |
| 2413 | ntfs_warning(vi->i_sb, "Changes in user/group/mode are not " |
| 2414 | "supported yet, ignoring."); |
| 2415 | err = -EOPNOTSUPP; |
| 2416 | goto out; |
| 2417 | } |
| 2418 | |
| 2419 | if (ia_valid & ATTR_SIZE) { |
| 2420 | if (attr->ia_size != i_size_read(vi)) { |
| 2421 | ntfs_warning(vi->i_sb, "Changes in inode size are not " |
| 2422 | "supported yet, ignoring."); |
| 2423 | err = -EOPNOTSUPP; |
| 2424 | // TODO: Implement... |
| 2425 | // err = vmtruncate(vi, attr->ia_size); |
| 2426 | if (err || ia_valid == ATTR_SIZE) |
| 2427 | goto out; |
| 2428 | } else { |
| 2429 | /* |
| 2430 | * We skipped the truncate but must still update |
| 2431 | * timestamps. |
| 2432 | */ |
Anton Altaparmakov | 1c7d469 | 2005-09-08 21:15:09 +0100 | [diff] [blame^] | 2433 | ia_valid |= ATTR_MTIME | ATTR_CTIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | } |
| 2435 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | if (ia_valid & ATTR_ATIME) |
Anton Altaparmakov | 1c7d469 | 2005-09-08 21:15:09 +0100 | [diff] [blame^] | 2437 | vi->i_atime = timespec_trunc(attr->ia_atime, |
| 2438 | vi->i_sb->s_time_gran); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2439 | if (ia_valid & ATTR_MTIME) |
Anton Altaparmakov | 1c7d469 | 2005-09-08 21:15:09 +0100 | [diff] [blame^] | 2440 | vi->i_mtime = timespec_trunc(attr->ia_mtime, |
| 2441 | vi->i_sb->s_time_gran); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | if (ia_valid & ATTR_CTIME) |
Anton Altaparmakov | 1c7d469 | 2005-09-08 21:15:09 +0100 | [diff] [blame^] | 2443 | vi->i_ctime = timespec_trunc(attr->ia_ctime, |
| 2444 | vi->i_sb->s_time_gran); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | mark_inode_dirty(vi); |
| 2446 | out: |
| 2447 | return err; |
| 2448 | } |
| 2449 | |
| 2450 | /** |
| 2451 | * ntfs_write_inode - write out a dirty inode |
| 2452 | * @vi: inode to write out |
| 2453 | * @sync: if true, write out synchronously |
| 2454 | * |
| 2455 | * Write out a dirty inode to disk including any extent inodes if present. |
| 2456 | * |
| 2457 | * If @sync is true, commit the inode to disk and wait for io completion. This |
| 2458 | * is done using write_mft_record(). |
| 2459 | * |
| 2460 | * If @sync is false, just schedule the write to happen but do not wait for i/o |
| 2461 | * completion. In 2.6 kernels, scheduling usually happens just by virtue of |
| 2462 | * marking the page (and in this case mft record) dirty but we do not implement |
| 2463 | * this yet as write_mft_record() largely ignores the @sync parameter and |
| 2464 | * always performs synchronous writes. |
| 2465 | * |
| 2466 | * Return 0 on success and -errno on error. |
| 2467 | */ |
| 2468 | int ntfs_write_inode(struct inode *vi, int sync) |
| 2469 | { |
| 2470 | sle64 nt; |
| 2471 | ntfs_inode *ni = NTFS_I(vi); |
| 2472 | ntfs_attr_search_ctx *ctx; |
| 2473 | MFT_RECORD *m; |
| 2474 | STANDARD_INFORMATION *si; |
| 2475 | int err = 0; |
| 2476 | BOOL modified = FALSE; |
| 2477 | |
| 2478 | ntfs_debug("Entering for %sinode 0x%lx.", NInoAttr(ni) ? "attr " : "", |
| 2479 | vi->i_ino); |
| 2480 | /* |
| 2481 | * Dirty attribute inodes are written via their real inodes so just |
| 2482 | * clean them here. Access time updates are taken care off when the |
| 2483 | * real inode is written. |
| 2484 | */ |
| 2485 | if (NInoAttr(ni)) { |
| 2486 | NInoClearDirty(ni); |
| 2487 | ntfs_debug("Done."); |
| 2488 | return 0; |
| 2489 | } |
| 2490 | /* Map, pin, and lock the mft record belonging to the inode. */ |
| 2491 | m = map_mft_record(ni); |
| 2492 | if (IS_ERR(m)) { |
| 2493 | err = PTR_ERR(m); |
| 2494 | goto err_out; |
| 2495 | } |
| 2496 | /* Update the access times in the standard information attribute. */ |
| 2497 | ctx = ntfs_attr_get_search_ctx(ni, m); |
| 2498 | if (unlikely(!ctx)) { |
| 2499 | err = -ENOMEM; |
| 2500 | goto unm_err_out; |
| 2501 | } |
| 2502 | err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, |
| 2503 | CASE_SENSITIVE, 0, NULL, 0, ctx); |
| 2504 | if (unlikely(err)) { |
| 2505 | ntfs_attr_put_search_ctx(ctx); |
| 2506 | goto unm_err_out; |
| 2507 | } |
| 2508 | si = (STANDARD_INFORMATION*)((u8*)ctx->attr + |
| 2509 | le16_to_cpu(ctx->attr->data.resident.value_offset)); |
| 2510 | /* Update the access times if they have changed. */ |
| 2511 | nt = utc2ntfs(vi->i_mtime); |
| 2512 | if (si->last_data_change_time != nt) { |
| 2513 | ntfs_debug("Updating mtime for inode 0x%lx: old = 0x%llx, " |
Randy Dunlap | 8907547 | 2005-03-03 11:19:53 +0000 | [diff] [blame] | 2514 | "new = 0x%llx", vi->i_ino, (long long) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | sle64_to_cpu(si->last_data_change_time), |
Randy Dunlap | 8907547 | 2005-03-03 11:19:53 +0000 | [diff] [blame] | 2516 | (long long)sle64_to_cpu(nt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | si->last_data_change_time = nt; |
| 2518 | modified = TRUE; |
| 2519 | } |
| 2520 | nt = utc2ntfs(vi->i_ctime); |
| 2521 | if (si->last_mft_change_time != nt) { |
| 2522 | ntfs_debug("Updating ctime for inode 0x%lx: old = 0x%llx, " |
Randy Dunlap | 8907547 | 2005-03-03 11:19:53 +0000 | [diff] [blame] | 2523 | "new = 0x%llx", vi->i_ino, (long long) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | sle64_to_cpu(si->last_mft_change_time), |
Randy Dunlap | 8907547 | 2005-03-03 11:19:53 +0000 | [diff] [blame] | 2525 | (long long)sle64_to_cpu(nt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | si->last_mft_change_time = nt; |
| 2527 | modified = TRUE; |
| 2528 | } |
| 2529 | nt = utc2ntfs(vi->i_atime); |
| 2530 | if (si->last_access_time != nt) { |
| 2531 | ntfs_debug("Updating atime for inode 0x%lx: old = 0x%llx, " |
| 2532 | "new = 0x%llx", vi->i_ino, |
Randy Dunlap | 8907547 | 2005-03-03 11:19:53 +0000 | [diff] [blame] | 2533 | (long long)sle64_to_cpu(si->last_access_time), |
| 2534 | (long long)sle64_to_cpu(nt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | si->last_access_time = nt; |
| 2536 | modified = TRUE; |
| 2537 | } |
| 2538 | /* |
| 2539 | * If we just modified the standard information attribute we need to |
| 2540 | * mark the mft record it is in dirty. We do this manually so that |
| 2541 | * mark_inode_dirty() is not called which would redirty the inode and |
| 2542 | * hence result in an infinite loop of trying to write the inode. |
| 2543 | * There is no need to mark the base inode nor the base mft record |
| 2544 | * dirty, since we are going to write this mft record below in any case |
| 2545 | * and the base mft record may actually not have been modified so it |
| 2546 | * might not need to be written out. |
| 2547 | * NOTE: It is not a problem when the inode for $MFT itself is being |
| 2548 | * written out as mark_ntfs_record_dirty() will only set I_DIRTY_PAGES |
| 2549 | * on the $MFT inode and hence ntfs_write_inode() will not be |
| 2550 | * re-invoked because of it which in turn is ok since the dirtied mft |
| 2551 | * record will be cleaned and written out to disk below, i.e. before |
| 2552 | * this function returns. |
| 2553 | */ |
| 2554 | if (modified && !NInoTestSetDirty(ctx->ntfs_ino)) |
| 2555 | mark_ntfs_record_dirty(ctx->ntfs_ino->page, |
| 2556 | ctx->ntfs_ino->page_ofs); |
| 2557 | ntfs_attr_put_search_ctx(ctx); |
| 2558 | /* Now the access times are updated, write the base mft record. */ |
| 2559 | if (NInoDirty(ni)) |
| 2560 | err = write_mft_record(ni, m, sync); |
| 2561 | /* Write all attached extent mft records. */ |
| 2562 | down(&ni->extent_lock); |
| 2563 | if (ni->nr_extents > 0) { |
| 2564 | ntfs_inode **extent_nis = ni->ext.extent_ntfs_inos; |
| 2565 | int i; |
| 2566 | |
| 2567 | ntfs_debug("Writing %i extent inodes.", ni->nr_extents); |
| 2568 | for (i = 0; i < ni->nr_extents; i++) { |
| 2569 | ntfs_inode *tni = extent_nis[i]; |
| 2570 | |
| 2571 | if (NInoDirty(tni)) { |
| 2572 | MFT_RECORD *tm = map_mft_record(tni); |
| 2573 | int ret; |
| 2574 | |
| 2575 | if (IS_ERR(tm)) { |
| 2576 | if (!err || err == -ENOMEM) |
| 2577 | err = PTR_ERR(tm); |
| 2578 | continue; |
| 2579 | } |
| 2580 | ret = write_mft_record(tni, tm, sync); |
| 2581 | unmap_mft_record(tni); |
| 2582 | if (unlikely(ret)) { |
| 2583 | if (!err || err == -ENOMEM) |
| 2584 | err = ret; |
| 2585 | } |
| 2586 | } |
| 2587 | } |
| 2588 | } |
| 2589 | up(&ni->extent_lock); |
| 2590 | unmap_mft_record(ni); |
| 2591 | if (unlikely(err)) |
| 2592 | goto err_out; |
| 2593 | ntfs_debug("Done."); |
| 2594 | return 0; |
| 2595 | unm_err_out: |
| 2596 | unmap_mft_record(ni); |
| 2597 | err_out: |
| 2598 | if (err == -ENOMEM) { |
| 2599 | ntfs_warning(vi->i_sb, "Not enough memory to write inode. " |
| 2600 | "Marking the inode dirty again, so the VFS " |
| 2601 | "retries later."); |
| 2602 | mark_inode_dirty(vi); |
| 2603 | } else { |
| 2604 | ntfs_error(vi->i_sb, "Failed (error code %i): Marking inode " |
| 2605 | "as bad. You should run chkdsk.", -err); |
| 2606 | make_bad_inode(vi); |
| 2607 | NVolSetErrors(ni->vol); |
| 2608 | } |
| 2609 | return err; |
| 2610 | } |
| 2611 | |
| 2612 | #endif /* NTFS_RW */ |