| 1 | /* |
| 2 | * inode.c |
| 3 | * |
| 4 | * PURPOSE |
| 5 | * Inode handling routines for the OSTA-UDF(tm) filesystem. |
| 6 | * |
| 7 | * COPYRIGHT |
| 8 | * This file is distributed under the terms of the GNU General Public |
| 9 | * License (GPL). Copies of the GPL can be obtained from: |
| 10 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| 11 | * Each contributing author retains all rights to their own work. |
| 12 | * |
| 13 | * (C) 1998 Dave Boynton |
| 14 | * (C) 1998-2004 Ben Fennema |
| 15 | * (C) 1999-2000 Stelias Computing Inc |
| 16 | * |
| 17 | * HISTORY |
| 18 | * |
| 19 | * 10/04/98 dgb Added rudimentary directory functions |
| 20 | * 10/07/98 Fully working udf_block_map! It works! |
| 21 | * 11/25/98 bmap altered to better support extents |
| 22 | * 12/06/98 blf partition support in udf_iget, udf_block_map |
| 23 | * and udf_read_inode |
| 24 | * 12/12/98 rewrote udf_block_map to handle next extents and descs across |
| 25 | * block boundaries (which is not actually allowed) |
| 26 | * 12/20/98 added support for strategy 4096 |
| 27 | * 03/07/99 rewrote udf_block_map (again) |
| 28 | * New funcs, inode_bmap, udf_next_aext |
| 29 | * 04/19/99 Support for writing device EA's for major/minor # |
| 30 | */ |
| 31 | |
| 32 | #include "udfdecl.h" |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/pagemap.h> |
| 36 | #include <linux/buffer_head.h> |
| 37 | #include <linux/writeback.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/crc-itu-t.h> |
| 40 | #include <linux/mpage.h> |
| 41 | #include <linux/aio.h> |
| 42 | |
| 43 | #include "udf_i.h" |
| 44 | #include "udf_sb.h" |
| 45 | |
| 46 | MODULE_AUTHOR("Ben Fennema"); |
| 47 | MODULE_DESCRIPTION("Universal Disk Format Filesystem"); |
| 48 | MODULE_LICENSE("GPL"); |
| 49 | |
| 50 | #define EXTENT_MERGE_SIZE 5 |
| 51 | |
| 52 | static umode_t udf_convert_permissions(struct fileEntry *); |
| 53 | static int udf_update_inode(struct inode *, int); |
| 54 | static void udf_fill_inode(struct inode *, struct buffer_head *); |
| 55 | static int udf_sync_inode(struct inode *inode); |
| 56 | static int udf_alloc_i_data(struct inode *inode, size_t size); |
| 57 | static sector_t inode_getblk(struct inode *, sector_t, int *, int *); |
| 58 | static int8_t udf_insert_aext(struct inode *, struct extent_position, |
| 59 | struct kernel_lb_addr, uint32_t); |
| 60 | static void udf_split_extents(struct inode *, int *, int, int, |
| 61 | struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); |
| 62 | static void udf_prealloc_extents(struct inode *, int, int, |
| 63 | struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); |
| 64 | static void udf_merge_extents(struct inode *, |
| 65 | struct kernel_long_ad[EXTENT_MERGE_SIZE], int *); |
| 66 | static void udf_update_extents(struct inode *, |
| 67 | struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int, |
| 68 | struct extent_position *); |
| 69 | static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int); |
| 70 | |
| 71 | static void __udf_clear_extent_cache(struct inode *inode) |
| 72 | { |
| 73 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 74 | |
| 75 | if (iinfo->cached_extent.lstart != -1) { |
| 76 | brelse(iinfo->cached_extent.epos.bh); |
| 77 | iinfo->cached_extent.lstart = -1; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | /* Invalidate extent cache */ |
| 82 | static void udf_clear_extent_cache(struct inode *inode) |
| 83 | { |
| 84 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 85 | |
| 86 | spin_lock(&iinfo->i_extent_cache_lock); |
| 87 | __udf_clear_extent_cache(inode); |
| 88 | spin_unlock(&iinfo->i_extent_cache_lock); |
| 89 | } |
| 90 | |
| 91 | /* Return contents of extent cache */ |
| 92 | static int udf_read_extent_cache(struct inode *inode, loff_t bcount, |
| 93 | loff_t *lbcount, struct extent_position *pos) |
| 94 | { |
| 95 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 96 | int ret = 0; |
| 97 | |
| 98 | spin_lock(&iinfo->i_extent_cache_lock); |
| 99 | if ((iinfo->cached_extent.lstart <= bcount) && |
| 100 | (iinfo->cached_extent.lstart != -1)) { |
| 101 | /* Cache hit */ |
| 102 | *lbcount = iinfo->cached_extent.lstart; |
| 103 | memcpy(pos, &iinfo->cached_extent.epos, |
| 104 | sizeof(struct extent_position)); |
| 105 | if (pos->bh) |
| 106 | get_bh(pos->bh); |
| 107 | ret = 1; |
| 108 | } |
| 109 | spin_unlock(&iinfo->i_extent_cache_lock); |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | /* Add extent to extent cache */ |
| 114 | static void udf_update_extent_cache(struct inode *inode, loff_t estart, |
| 115 | struct extent_position *pos, int next_epos) |
| 116 | { |
| 117 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 118 | |
| 119 | spin_lock(&iinfo->i_extent_cache_lock); |
| 120 | /* Invalidate previously cached extent */ |
| 121 | __udf_clear_extent_cache(inode); |
| 122 | if (pos->bh) |
| 123 | get_bh(pos->bh); |
| 124 | memcpy(&iinfo->cached_extent.epos, pos, |
| 125 | sizeof(struct extent_position)); |
| 126 | iinfo->cached_extent.lstart = estart; |
| 127 | if (next_epos) |
| 128 | switch (iinfo->i_alloc_type) { |
| 129 | case ICBTAG_FLAG_AD_SHORT: |
| 130 | iinfo->cached_extent.epos.offset -= |
| 131 | sizeof(struct short_ad); |
| 132 | break; |
| 133 | case ICBTAG_FLAG_AD_LONG: |
| 134 | iinfo->cached_extent.epos.offset -= |
| 135 | sizeof(struct long_ad); |
| 136 | } |
| 137 | spin_unlock(&iinfo->i_extent_cache_lock); |
| 138 | } |
| 139 | |
| 140 | void udf_evict_inode(struct inode *inode) |
| 141 | { |
| 142 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 143 | int want_delete = 0; |
| 144 | |
| 145 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
| 146 | want_delete = 1; |
| 147 | udf_setsize(inode, 0); |
| 148 | udf_update_inode(inode, IS_SYNC(inode)); |
| 149 | } |
| 150 | truncate_inode_pages_final(&inode->i_data); |
| 151 | invalidate_inode_buffers(inode); |
| 152 | clear_inode(inode); |
| 153 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && |
| 154 | inode->i_size != iinfo->i_lenExtents) { |
| 155 | udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n", |
| 156 | inode->i_ino, inode->i_mode, |
| 157 | (unsigned long long)inode->i_size, |
| 158 | (unsigned long long)iinfo->i_lenExtents); |
| 159 | } |
| 160 | kfree(iinfo->i_ext.i_data); |
| 161 | iinfo->i_ext.i_data = NULL; |
| 162 | udf_clear_extent_cache(inode); |
| 163 | if (want_delete) { |
| 164 | udf_free_inode(inode); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | static void udf_write_failed(struct address_space *mapping, loff_t to) |
| 169 | { |
| 170 | struct inode *inode = mapping->host; |
| 171 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 172 | loff_t isize = inode->i_size; |
| 173 | |
| 174 | if (to > isize) { |
| 175 | truncate_pagecache(inode, isize); |
| 176 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
| 177 | down_write(&iinfo->i_data_sem); |
| 178 | udf_clear_extent_cache(inode); |
| 179 | udf_truncate_extents(inode); |
| 180 | up_write(&iinfo->i_data_sem); |
| 181 | } |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | static int udf_writepage(struct page *page, struct writeback_control *wbc) |
| 186 | { |
| 187 | return block_write_full_page(page, udf_get_block, wbc); |
| 188 | } |
| 189 | |
| 190 | static int udf_writepages(struct address_space *mapping, |
| 191 | struct writeback_control *wbc) |
| 192 | { |
| 193 | return mpage_writepages(mapping, wbc, udf_get_block); |
| 194 | } |
| 195 | |
| 196 | static int udf_readpage(struct file *file, struct page *page) |
| 197 | { |
| 198 | return mpage_readpage(page, udf_get_block); |
| 199 | } |
| 200 | |
| 201 | static int udf_readpages(struct file *file, struct address_space *mapping, |
| 202 | struct list_head *pages, unsigned nr_pages) |
| 203 | { |
| 204 | return mpage_readpages(mapping, pages, nr_pages, udf_get_block); |
| 205 | } |
| 206 | |
| 207 | static int udf_write_begin(struct file *file, struct address_space *mapping, |
| 208 | loff_t pos, unsigned len, unsigned flags, |
| 209 | struct page **pagep, void **fsdata) |
| 210 | { |
| 211 | int ret; |
| 212 | |
| 213 | ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block); |
| 214 | if (unlikely(ret)) |
| 215 | udf_write_failed(mapping, pos + len); |
| 216 | return ret; |
| 217 | } |
| 218 | |
| 219 | static ssize_t udf_direct_IO(int rw, struct kiocb *iocb, |
| 220 | struct iov_iter *iter, |
| 221 | loff_t offset) |
| 222 | { |
| 223 | struct file *file = iocb->ki_filp; |
| 224 | struct address_space *mapping = file->f_mapping; |
| 225 | struct inode *inode = mapping->host; |
| 226 | ssize_t ret; |
| 227 | |
| 228 | ret = blockdev_direct_IO(rw, iocb, inode, iter->iov, offset, iter->nr_segs, |
| 229 | udf_get_block); |
| 230 | if (unlikely(ret < 0 && (rw & WRITE))) |
| 231 | udf_write_failed(mapping, offset + iov_length(iter->iov, iter->nr_segs)); |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | static sector_t udf_bmap(struct address_space *mapping, sector_t block) |
| 236 | { |
| 237 | return generic_block_bmap(mapping, block, udf_get_block); |
| 238 | } |
| 239 | |
| 240 | const struct address_space_operations udf_aops = { |
| 241 | .readpage = udf_readpage, |
| 242 | .readpages = udf_readpages, |
| 243 | .writepage = udf_writepage, |
| 244 | .writepages = udf_writepages, |
| 245 | .write_begin = udf_write_begin, |
| 246 | .write_end = generic_write_end, |
| 247 | .direct_IO = udf_direct_IO, |
| 248 | .bmap = udf_bmap, |
| 249 | }; |
| 250 | |
| 251 | /* |
| 252 | * Expand file stored in ICB to a normal one-block-file |
| 253 | * |
| 254 | * This function requires i_data_sem for writing and releases it. |
| 255 | * This function requires i_mutex held |
| 256 | */ |
| 257 | int udf_expand_file_adinicb(struct inode *inode) |
| 258 | { |
| 259 | struct page *page; |
| 260 | char *kaddr; |
| 261 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 262 | int err; |
| 263 | struct writeback_control udf_wbc = { |
| 264 | .sync_mode = WB_SYNC_NONE, |
| 265 | .nr_to_write = 1, |
| 266 | }; |
| 267 | |
| 268 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
| 269 | if (!iinfo->i_lenAlloc) { |
| 270 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) |
| 271 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; |
| 272 | else |
| 273 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; |
| 274 | /* from now on we have normal address_space methods */ |
| 275 | inode->i_data.a_ops = &udf_aops; |
| 276 | up_write(&iinfo->i_data_sem); |
| 277 | mark_inode_dirty(inode); |
| 278 | return 0; |
| 279 | } |
| 280 | /* |
| 281 | * Release i_data_sem so that we can lock a page - page lock ranks |
| 282 | * above i_data_sem. i_mutex still protects us against file changes. |
| 283 | */ |
| 284 | up_write(&iinfo->i_data_sem); |
| 285 | |
| 286 | page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS); |
| 287 | if (!page) |
| 288 | return -ENOMEM; |
| 289 | |
| 290 | if (!PageUptodate(page)) { |
| 291 | kaddr = kmap(page); |
| 292 | memset(kaddr + iinfo->i_lenAlloc, 0x00, |
| 293 | PAGE_CACHE_SIZE - iinfo->i_lenAlloc); |
| 294 | memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, |
| 295 | iinfo->i_lenAlloc); |
| 296 | flush_dcache_page(page); |
| 297 | SetPageUptodate(page); |
| 298 | kunmap(page); |
| 299 | } |
| 300 | down_write(&iinfo->i_data_sem); |
| 301 | memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00, |
| 302 | iinfo->i_lenAlloc); |
| 303 | iinfo->i_lenAlloc = 0; |
| 304 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) |
| 305 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT; |
| 306 | else |
| 307 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; |
| 308 | /* from now on we have normal address_space methods */ |
| 309 | inode->i_data.a_ops = &udf_aops; |
| 310 | up_write(&iinfo->i_data_sem); |
| 311 | err = inode->i_data.a_ops->writepage(page, &udf_wbc); |
| 312 | if (err) { |
| 313 | /* Restore everything back so that we don't lose data... */ |
| 314 | lock_page(page); |
| 315 | kaddr = kmap(page); |
| 316 | down_write(&iinfo->i_data_sem); |
| 317 | memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, |
| 318 | inode->i_size); |
| 319 | kunmap(page); |
| 320 | unlock_page(page); |
| 321 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; |
| 322 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 323 | up_write(&iinfo->i_data_sem); |
| 324 | } |
| 325 | page_cache_release(page); |
| 326 | mark_inode_dirty(inode); |
| 327 | |
| 328 | return err; |
| 329 | } |
| 330 | |
| 331 | struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block, |
| 332 | int *err) |
| 333 | { |
| 334 | int newblock; |
| 335 | struct buffer_head *dbh = NULL; |
| 336 | struct kernel_lb_addr eloc; |
| 337 | uint8_t alloctype; |
| 338 | struct extent_position epos; |
| 339 | |
| 340 | struct udf_fileident_bh sfibh, dfibh; |
| 341 | loff_t f_pos = udf_ext0_offset(inode); |
| 342 | int size = udf_ext0_offset(inode) + inode->i_size; |
| 343 | struct fileIdentDesc cfi, *sfi, *dfi; |
| 344 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 345 | |
| 346 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) |
| 347 | alloctype = ICBTAG_FLAG_AD_SHORT; |
| 348 | else |
| 349 | alloctype = ICBTAG_FLAG_AD_LONG; |
| 350 | |
| 351 | if (!inode->i_size) { |
| 352 | iinfo->i_alloc_type = alloctype; |
| 353 | mark_inode_dirty(inode); |
| 354 | return NULL; |
| 355 | } |
| 356 | |
| 357 | /* alloc block, and copy data to it */ |
| 358 | *block = udf_new_block(inode->i_sb, inode, |
| 359 | iinfo->i_location.partitionReferenceNum, |
| 360 | iinfo->i_location.logicalBlockNum, err); |
| 361 | if (!(*block)) |
| 362 | return NULL; |
| 363 | newblock = udf_get_pblock(inode->i_sb, *block, |
| 364 | iinfo->i_location.partitionReferenceNum, |
| 365 | 0); |
| 366 | if (!newblock) |
| 367 | return NULL; |
| 368 | dbh = udf_tgetblk(inode->i_sb, newblock); |
| 369 | if (!dbh) |
| 370 | return NULL; |
| 371 | lock_buffer(dbh); |
| 372 | memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize); |
| 373 | set_buffer_uptodate(dbh); |
| 374 | unlock_buffer(dbh); |
| 375 | mark_buffer_dirty_inode(dbh, inode); |
| 376 | |
| 377 | sfibh.soffset = sfibh.eoffset = |
| 378 | f_pos & (inode->i_sb->s_blocksize - 1); |
| 379 | sfibh.sbh = sfibh.ebh = NULL; |
| 380 | dfibh.soffset = dfibh.eoffset = 0; |
| 381 | dfibh.sbh = dfibh.ebh = dbh; |
| 382 | while (f_pos < size) { |
| 383 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; |
| 384 | sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, |
| 385 | NULL, NULL, NULL); |
| 386 | if (!sfi) { |
| 387 | brelse(dbh); |
| 388 | return NULL; |
| 389 | } |
| 390 | iinfo->i_alloc_type = alloctype; |
| 391 | sfi->descTag.tagLocation = cpu_to_le32(*block); |
| 392 | dfibh.soffset = dfibh.eoffset; |
| 393 | dfibh.eoffset += (sfibh.eoffset - sfibh.soffset); |
| 394 | dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset); |
| 395 | if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse, |
| 396 | sfi->fileIdent + |
| 397 | le16_to_cpu(sfi->lengthOfImpUse))) { |
| 398 | iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB; |
| 399 | brelse(dbh); |
| 400 | return NULL; |
| 401 | } |
| 402 | } |
| 403 | mark_buffer_dirty_inode(dbh, inode); |
| 404 | |
| 405 | memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0, |
| 406 | iinfo->i_lenAlloc); |
| 407 | iinfo->i_lenAlloc = 0; |
| 408 | eloc.logicalBlockNum = *block; |
| 409 | eloc.partitionReferenceNum = |
| 410 | iinfo->i_location.partitionReferenceNum; |
| 411 | iinfo->i_lenExtents = inode->i_size; |
| 412 | epos.bh = NULL; |
| 413 | epos.block = iinfo->i_location; |
| 414 | epos.offset = udf_file_entry_alloc_offset(inode); |
| 415 | udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); |
| 416 | /* UniqueID stuff */ |
| 417 | |
| 418 | brelse(epos.bh); |
| 419 | mark_inode_dirty(inode); |
| 420 | return dbh; |
| 421 | } |
| 422 | |
| 423 | static int udf_get_block(struct inode *inode, sector_t block, |
| 424 | struct buffer_head *bh_result, int create) |
| 425 | { |
| 426 | int err, new; |
| 427 | sector_t phys = 0; |
| 428 | struct udf_inode_info *iinfo; |
| 429 | |
| 430 | if (!create) { |
| 431 | phys = udf_block_map(inode, block); |
| 432 | if (phys) |
| 433 | map_bh(bh_result, inode->i_sb, phys); |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | err = -EIO; |
| 438 | new = 0; |
| 439 | iinfo = UDF_I(inode); |
| 440 | |
| 441 | down_write(&iinfo->i_data_sem); |
| 442 | if (block == iinfo->i_next_alloc_block + 1) { |
| 443 | iinfo->i_next_alloc_block++; |
| 444 | iinfo->i_next_alloc_goal++; |
| 445 | } |
| 446 | |
| 447 | udf_clear_extent_cache(inode); |
| 448 | phys = inode_getblk(inode, block, &err, &new); |
| 449 | if (!phys) |
| 450 | goto abort; |
| 451 | |
| 452 | if (new) |
| 453 | set_buffer_new(bh_result); |
| 454 | map_bh(bh_result, inode->i_sb, phys); |
| 455 | |
| 456 | abort: |
| 457 | up_write(&iinfo->i_data_sem); |
| 458 | return err; |
| 459 | } |
| 460 | |
| 461 | static struct buffer_head *udf_getblk(struct inode *inode, long block, |
| 462 | int create, int *err) |
| 463 | { |
| 464 | struct buffer_head *bh; |
| 465 | struct buffer_head dummy; |
| 466 | |
| 467 | dummy.b_state = 0; |
| 468 | dummy.b_blocknr = -1000; |
| 469 | *err = udf_get_block(inode, block, &dummy, create); |
| 470 | if (!*err && buffer_mapped(&dummy)) { |
| 471 | bh = sb_getblk(inode->i_sb, dummy.b_blocknr); |
| 472 | if (buffer_new(&dummy)) { |
| 473 | lock_buffer(bh); |
| 474 | memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); |
| 475 | set_buffer_uptodate(bh); |
| 476 | unlock_buffer(bh); |
| 477 | mark_buffer_dirty_inode(bh, inode); |
| 478 | } |
| 479 | return bh; |
| 480 | } |
| 481 | |
| 482 | return NULL; |
| 483 | } |
| 484 | |
| 485 | /* Extend the file by 'blocks' blocks, return the number of extents added */ |
| 486 | static int udf_do_extend_file(struct inode *inode, |
| 487 | struct extent_position *last_pos, |
| 488 | struct kernel_long_ad *last_ext, |
| 489 | sector_t blocks) |
| 490 | { |
| 491 | sector_t add; |
| 492 | int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK); |
| 493 | struct super_block *sb = inode->i_sb; |
| 494 | struct kernel_lb_addr prealloc_loc = {}; |
| 495 | int prealloc_len = 0; |
| 496 | struct udf_inode_info *iinfo; |
| 497 | int err; |
| 498 | |
| 499 | /* The previous extent is fake and we should not extend by anything |
| 500 | * - there's nothing to do... */ |
| 501 | if (!blocks && fake) |
| 502 | return 0; |
| 503 | |
| 504 | iinfo = UDF_I(inode); |
| 505 | /* Round the last extent up to a multiple of block size */ |
| 506 | if (last_ext->extLength & (sb->s_blocksize - 1)) { |
| 507 | last_ext->extLength = |
| 508 | (last_ext->extLength & UDF_EXTENT_FLAG_MASK) | |
| 509 | (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 510 | sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); |
| 511 | iinfo->i_lenExtents = |
| 512 | (iinfo->i_lenExtents + sb->s_blocksize - 1) & |
| 513 | ~(sb->s_blocksize - 1); |
| 514 | } |
| 515 | |
| 516 | /* Last extent are just preallocated blocks? */ |
| 517 | if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == |
| 518 | EXT_NOT_RECORDED_ALLOCATED) { |
| 519 | /* Save the extent so that we can reattach it to the end */ |
| 520 | prealloc_loc = last_ext->extLocation; |
| 521 | prealloc_len = last_ext->extLength; |
| 522 | /* Mark the extent as a hole */ |
| 523 | last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | |
| 524 | (last_ext->extLength & UDF_EXTENT_LENGTH_MASK); |
| 525 | last_ext->extLocation.logicalBlockNum = 0; |
| 526 | last_ext->extLocation.partitionReferenceNum = 0; |
| 527 | } |
| 528 | |
| 529 | /* Can we merge with the previous extent? */ |
| 530 | if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == |
| 531 | EXT_NOT_RECORDED_NOT_ALLOCATED) { |
| 532 | add = ((1 << 30) - sb->s_blocksize - |
| 533 | (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >> |
| 534 | sb->s_blocksize_bits; |
| 535 | if (add > blocks) |
| 536 | add = blocks; |
| 537 | blocks -= add; |
| 538 | last_ext->extLength += add << sb->s_blocksize_bits; |
| 539 | } |
| 540 | |
| 541 | if (fake) { |
| 542 | udf_add_aext(inode, last_pos, &last_ext->extLocation, |
| 543 | last_ext->extLength, 1); |
| 544 | count++; |
| 545 | } else |
| 546 | udf_write_aext(inode, last_pos, &last_ext->extLocation, |
| 547 | last_ext->extLength, 1); |
| 548 | |
| 549 | /* Managed to do everything necessary? */ |
| 550 | if (!blocks) |
| 551 | goto out; |
| 552 | |
| 553 | /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */ |
| 554 | last_ext->extLocation.logicalBlockNum = 0; |
| 555 | last_ext->extLocation.partitionReferenceNum = 0; |
| 556 | add = (1 << (30-sb->s_blocksize_bits)) - 1; |
| 557 | last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | |
| 558 | (add << sb->s_blocksize_bits); |
| 559 | |
| 560 | /* Create enough extents to cover the whole hole */ |
| 561 | while (blocks > add) { |
| 562 | blocks -= add; |
| 563 | err = udf_add_aext(inode, last_pos, &last_ext->extLocation, |
| 564 | last_ext->extLength, 1); |
| 565 | if (err) |
| 566 | return err; |
| 567 | count++; |
| 568 | } |
| 569 | if (blocks) { |
| 570 | last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | |
| 571 | (blocks << sb->s_blocksize_bits); |
| 572 | err = udf_add_aext(inode, last_pos, &last_ext->extLocation, |
| 573 | last_ext->extLength, 1); |
| 574 | if (err) |
| 575 | return err; |
| 576 | count++; |
| 577 | } |
| 578 | |
| 579 | out: |
| 580 | /* Do we have some preallocated blocks saved? */ |
| 581 | if (prealloc_len) { |
| 582 | err = udf_add_aext(inode, last_pos, &prealloc_loc, |
| 583 | prealloc_len, 1); |
| 584 | if (err) |
| 585 | return err; |
| 586 | last_ext->extLocation = prealloc_loc; |
| 587 | last_ext->extLength = prealloc_len; |
| 588 | count++; |
| 589 | } |
| 590 | |
| 591 | /* last_pos should point to the last written extent... */ |
| 592 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 593 | last_pos->offset -= sizeof(struct short_ad); |
| 594 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 595 | last_pos->offset -= sizeof(struct long_ad); |
| 596 | else |
| 597 | return -EIO; |
| 598 | |
| 599 | return count; |
| 600 | } |
| 601 | |
| 602 | static int udf_extend_file(struct inode *inode, loff_t newsize) |
| 603 | { |
| 604 | |
| 605 | struct extent_position epos; |
| 606 | struct kernel_lb_addr eloc; |
| 607 | uint32_t elen; |
| 608 | int8_t etype; |
| 609 | struct super_block *sb = inode->i_sb; |
| 610 | sector_t first_block = newsize >> sb->s_blocksize_bits, offset; |
| 611 | int adsize; |
| 612 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 613 | struct kernel_long_ad extent; |
| 614 | int err; |
| 615 | |
| 616 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 617 | adsize = sizeof(struct short_ad); |
| 618 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 619 | adsize = sizeof(struct long_ad); |
| 620 | else |
| 621 | BUG(); |
| 622 | |
| 623 | etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset); |
| 624 | |
| 625 | /* File has extent covering the new size (could happen when extending |
| 626 | * inside a block)? */ |
| 627 | if (etype != -1) |
| 628 | return 0; |
| 629 | if (newsize & (sb->s_blocksize - 1)) |
| 630 | offset++; |
| 631 | /* Extended file just to the boundary of the last file block? */ |
| 632 | if (offset == 0) |
| 633 | return 0; |
| 634 | |
| 635 | /* Truncate is extending the file by 'offset' blocks */ |
| 636 | if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) || |
| 637 | (epos.bh && epos.offset == sizeof(struct allocExtDesc))) { |
| 638 | /* File has no extents at all or has empty last |
| 639 | * indirect extent! Create a fake extent... */ |
| 640 | extent.extLocation.logicalBlockNum = 0; |
| 641 | extent.extLocation.partitionReferenceNum = 0; |
| 642 | extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; |
| 643 | } else { |
| 644 | epos.offset -= adsize; |
| 645 | etype = udf_next_aext(inode, &epos, &extent.extLocation, |
| 646 | &extent.extLength, 0); |
| 647 | extent.extLength |= etype << 30; |
| 648 | } |
| 649 | err = udf_do_extend_file(inode, &epos, &extent, offset); |
| 650 | if (err < 0) |
| 651 | goto out; |
| 652 | err = 0; |
| 653 | iinfo->i_lenExtents = newsize; |
| 654 | out: |
| 655 | brelse(epos.bh); |
| 656 | return err; |
| 657 | } |
| 658 | |
| 659 | static sector_t inode_getblk(struct inode *inode, sector_t block, |
| 660 | int *err, int *new) |
| 661 | { |
| 662 | struct kernel_long_ad laarr[EXTENT_MERGE_SIZE]; |
| 663 | struct extent_position prev_epos, cur_epos, next_epos; |
| 664 | int count = 0, startnum = 0, endnum = 0; |
| 665 | uint32_t elen = 0, tmpelen; |
| 666 | struct kernel_lb_addr eloc, tmpeloc; |
| 667 | int c = 1; |
| 668 | loff_t lbcount = 0, b_off = 0; |
| 669 | uint32_t newblocknum, newblock; |
| 670 | sector_t offset = 0; |
| 671 | int8_t etype; |
| 672 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 673 | int goal = 0, pgoal = iinfo->i_location.logicalBlockNum; |
| 674 | int lastblock = 0; |
| 675 | bool isBeyondEOF; |
| 676 | |
| 677 | *err = 0; |
| 678 | *new = 0; |
| 679 | prev_epos.offset = udf_file_entry_alloc_offset(inode); |
| 680 | prev_epos.block = iinfo->i_location; |
| 681 | prev_epos.bh = NULL; |
| 682 | cur_epos = next_epos = prev_epos; |
| 683 | b_off = (loff_t)block << inode->i_sb->s_blocksize_bits; |
| 684 | |
| 685 | /* find the extent which contains the block we are looking for. |
| 686 | alternate between laarr[0] and laarr[1] for locations of the |
| 687 | current extent, and the previous extent */ |
| 688 | do { |
| 689 | if (prev_epos.bh != cur_epos.bh) { |
| 690 | brelse(prev_epos.bh); |
| 691 | get_bh(cur_epos.bh); |
| 692 | prev_epos.bh = cur_epos.bh; |
| 693 | } |
| 694 | if (cur_epos.bh != next_epos.bh) { |
| 695 | brelse(cur_epos.bh); |
| 696 | get_bh(next_epos.bh); |
| 697 | cur_epos.bh = next_epos.bh; |
| 698 | } |
| 699 | |
| 700 | lbcount += elen; |
| 701 | |
| 702 | prev_epos.block = cur_epos.block; |
| 703 | cur_epos.block = next_epos.block; |
| 704 | |
| 705 | prev_epos.offset = cur_epos.offset; |
| 706 | cur_epos.offset = next_epos.offset; |
| 707 | |
| 708 | etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1); |
| 709 | if (etype == -1) |
| 710 | break; |
| 711 | |
| 712 | c = !c; |
| 713 | |
| 714 | laarr[c].extLength = (etype << 30) | elen; |
| 715 | laarr[c].extLocation = eloc; |
| 716 | |
| 717 | if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) |
| 718 | pgoal = eloc.logicalBlockNum + |
| 719 | ((elen + inode->i_sb->s_blocksize - 1) >> |
| 720 | inode->i_sb->s_blocksize_bits); |
| 721 | |
| 722 | count++; |
| 723 | } while (lbcount + elen <= b_off); |
| 724 | |
| 725 | b_off -= lbcount; |
| 726 | offset = b_off >> inode->i_sb->s_blocksize_bits; |
| 727 | /* |
| 728 | * Move prev_epos and cur_epos into indirect extent if we are at |
| 729 | * the pointer to it |
| 730 | */ |
| 731 | udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0); |
| 732 | udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0); |
| 733 | |
| 734 | /* if the extent is allocated and recorded, return the block |
| 735 | if the extent is not a multiple of the blocksize, round up */ |
| 736 | |
| 737 | if (etype == (EXT_RECORDED_ALLOCATED >> 30)) { |
| 738 | if (elen & (inode->i_sb->s_blocksize - 1)) { |
| 739 | elen = EXT_RECORDED_ALLOCATED | |
| 740 | ((elen + inode->i_sb->s_blocksize - 1) & |
| 741 | ~(inode->i_sb->s_blocksize - 1)); |
| 742 | udf_write_aext(inode, &cur_epos, &eloc, elen, 1); |
| 743 | } |
| 744 | brelse(prev_epos.bh); |
| 745 | brelse(cur_epos.bh); |
| 746 | brelse(next_epos.bh); |
| 747 | newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset); |
| 748 | return newblock; |
| 749 | } |
| 750 | |
| 751 | /* Are we beyond EOF? */ |
| 752 | if (etype == -1) { |
| 753 | int ret; |
| 754 | isBeyondEOF = 1; |
| 755 | if (count) { |
| 756 | if (c) |
| 757 | laarr[0] = laarr[1]; |
| 758 | startnum = 1; |
| 759 | } else { |
| 760 | /* Create a fake extent when there's not one */ |
| 761 | memset(&laarr[0].extLocation, 0x00, |
| 762 | sizeof(struct kernel_lb_addr)); |
| 763 | laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED; |
| 764 | /* Will udf_do_extend_file() create real extent from |
| 765 | a fake one? */ |
| 766 | startnum = (offset > 0); |
| 767 | } |
| 768 | /* Create extents for the hole between EOF and offset */ |
| 769 | ret = udf_do_extend_file(inode, &prev_epos, laarr, offset); |
| 770 | if (ret < 0) { |
| 771 | brelse(prev_epos.bh); |
| 772 | brelse(cur_epos.bh); |
| 773 | brelse(next_epos.bh); |
| 774 | *err = ret; |
| 775 | return 0; |
| 776 | } |
| 777 | c = 0; |
| 778 | offset = 0; |
| 779 | count += ret; |
| 780 | /* We are not covered by a preallocated extent? */ |
| 781 | if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != |
| 782 | EXT_NOT_RECORDED_ALLOCATED) { |
| 783 | /* Is there any real extent? - otherwise we overwrite |
| 784 | * the fake one... */ |
| 785 | if (count) |
| 786 | c = !c; |
| 787 | laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | |
| 788 | inode->i_sb->s_blocksize; |
| 789 | memset(&laarr[c].extLocation, 0x00, |
| 790 | sizeof(struct kernel_lb_addr)); |
| 791 | count++; |
| 792 | } |
| 793 | endnum = c + 1; |
| 794 | lastblock = 1; |
| 795 | } else { |
| 796 | isBeyondEOF = 0; |
| 797 | endnum = startnum = ((count > 2) ? 2 : count); |
| 798 | |
| 799 | /* if the current extent is in position 0, |
| 800 | swap it with the previous */ |
| 801 | if (!c && count != 1) { |
| 802 | laarr[2] = laarr[0]; |
| 803 | laarr[0] = laarr[1]; |
| 804 | laarr[1] = laarr[2]; |
| 805 | c = 1; |
| 806 | } |
| 807 | |
| 808 | /* if the current block is located in an extent, |
| 809 | read the next extent */ |
| 810 | etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0); |
| 811 | if (etype != -1) { |
| 812 | laarr[c + 1].extLength = (etype << 30) | elen; |
| 813 | laarr[c + 1].extLocation = eloc; |
| 814 | count++; |
| 815 | startnum++; |
| 816 | endnum++; |
| 817 | } else |
| 818 | lastblock = 1; |
| 819 | } |
| 820 | |
| 821 | /* if the current extent is not recorded but allocated, get the |
| 822 | * block in the extent corresponding to the requested block */ |
| 823 | if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) |
| 824 | newblocknum = laarr[c].extLocation.logicalBlockNum + offset; |
| 825 | else { /* otherwise, allocate a new block */ |
| 826 | if (iinfo->i_next_alloc_block == block) |
| 827 | goal = iinfo->i_next_alloc_goal; |
| 828 | |
| 829 | if (!goal) { |
| 830 | if (!(goal = pgoal)) /* XXX: what was intended here? */ |
| 831 | goal = iinfo->i_location.logicalBlockNum + 1; |
| 832 | } |
| 833 | |
| 834 | newblocknum = udf_new_block(inode->i_sb, inode, |
| 835 | iinfo->i_location.partitionReferenceNum, |
| 836 | goal, err); |
| 837 | if (!newblocknum) { |
| 838 | brelse(prev_epos.bh); |
| 839 | brelse(cur_epos.bh); |
| 840 | brelse(next_epos.bh); |
| 841 | *err = -ENOSPC; |
| 842 | return 0; |
| 843 | } |
| 844 | if (isBeyondEOF) |
| 845 | iinfo->i_lenExtents += inode->i_sb->s_blocksize; |
| 846 | } |
| 847 | |
| 848 | /* if the extent the requsted block is located in contains multiple |
| 849 | * blocks, split the extent into at most three extents. blocks prior |
| 850 | * to requested block, requested block, and blocks after requested |
| 851 | * block */ |
| 852 | udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); |
| 853 | |
| 854 | #ifdef UDF_PREALLOCATE |
| 855 | /* We preallocate blocks only for regular files. It also makes sense |
| 856 | * for directories but there's a problem when to drop the |
| 857 | * preallocation. We might use some delayed work for that but I feel |
| 858 | * it's overengineering for a filesystem like UDF. */ |
| 859 | if (S_ISREG(inode->i_mode)) |
| 860 | udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); |
| 861 | #endif |
| 862 | |
| 863 | /* merge any continuous blocks in laarr */ |
| 864 | udf_merge_extents(inode, laarr, &endnum); |
| 865 | |
| 866 | /* write back the new extents, inserting new extents if the new number |
| 867 | * of extents is greater than the old number, and deleting extents if |
| 868 | * the new number of extents is less than the old number */ |
| 869 | udf_update_extents(inode, laarr, startnum, endnum, &prev_epos); |
| 870 | |
| 871 | brelse(prev_epos.bh); |
| 872 | brelse(cur_epos.bh); |
| 873 | brelse(next_epos.bh); |
| 874 | |
| 875 | newblock = udf_get_pblock(inode->i_sb, newblocknum, |
| 876 | iinfo->i_location.partitionReferenceNum, 0); |
| 877 | if (!newblock) { |
| 878 | *err = -EIO; |
| 879 | return 0; |
| 880 | } |
| 881 | *new = 1; |
| 882 | iinfo->i_next_alloc_block = block; |
| 883 | iinfo->i_next_alloc_goal = newblocknum; |
| 884 | inode->i_ctime = current_fs_time(inode->i_sb); |
| 885 | |
| 886 | if (IS_SYNC(inode)) |
| 887 | udf_sync_inode(inode); |
| 888 | else |
| 889 | mark_inode_dirty(inode); |
| 890 | |
| 891 | return newblock; |
| 892 | } |
| 893 | |
| 894 | static void udf_split_extents(struct inode *inode, int *c, int offset, |
| 895 | int newblocknum, |
| 896 | struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], |
| 897 | int *endnum) |
| 898 | { |
| 899 | unsigned long blocksize = inode->i_sb->s_blocksize; |
| 900 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
| 901 | |
| 902 | if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) || |
| 903 | (laarr[*c].extLength >> 30) == |
| 904 | (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { |
| 905 | int curr = *c; |
| 906 | int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) + |
| 907 | blocksize - 1) >> blocksize_bits; |
| 908 | int8_t etype = (laarr[curr].extLength >> 30); |
| 909 | |
| 910 | if (blen == 1) |
| 911 | ; |
| 912 | else if (!offset || blen == offset + 1) { |
| 913 | laarr[curr + 2] = laarr[curr + 1]; |
| 914 | laarr[curr + 1] = laarr[curr]; |
| 915 | } else { |
| 916 | laarr[curr + 3] = laarr[curr + 1]; |
| 917 | laarr[curr + 2] = laarr[curr + 1] = laarr[curr]; |
| 918 | } |
| 919 | |
| 920 | if (offset) { |
| 921 | if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) { |
| 922 | udf_free_blocks(inode->i_sb, inode, |
| 923 | &laarr[curr].extLocation, |
| 924 | 0, offset); |
| 925 | laarr[curr].extLength = |
| 926 | EXT_NOT_RECORDED_NOT_ALLOCATED | |
| 927 | (offset << blocksize_bits); |
| 928 | laarr[curr].extLocation.logicalBlockNum = 0; |
| 929 | laarr[curr].extLocation. |
| 930 | partitionReferenceNum = 0; |
| 931 | } else |
| 932 | laarr[curr].extLength = (etype << 30) | |
| 933 | (offset << blocksize_bits); |
| 934 | curr++; |
| 935 | (*c)++; |
| 936 | (*endnum)++; |
| 937 | } |
| 938 | |
| 939 | laarr[curr].extLocation.logicalBlockNum = newblocknum; |
| 940 | if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) |
| 941 | laarr[curr].extLocation.partitionReferenceNum = |
| 942 | UDF_I(inode)->i_location.partitionReferenceNum; |
| 943 | laarr[curr].extLength = EXT_RECORDED_ALLOCATED | |
| 944 | blocksize; |
| 945 | curr++; |
| 946 | |
| 947 | if (blen != offset + 1) { |
| 948 | if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) |
| 949 | laarr[curr].extLocation.logicalBlockNum += |
| 950 | offset + 1; |
| 951 | laarr[curr].extLength = (etype << 30) | |
| 952 | ((blen - (offset + 1)) << blocksize_bits); |
| 953 | curr++; |
| 954 | (*endnum)++; |
| 955 | } |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | static void udf_prealloc_extents(struct inode *inode, int c, int lastblock, |
| 960 | struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], |
| 961 | int *endnum) |
| 962 | { |
| 963 | int start, length = 0, currlength = 0, i; |
| 964 | |
| 965 | if (*endnum >= (c + 1)) { |
| 966 | if (!lastblock) |
| 967 | return; |
| 968 | else |
| 969 | start = c; |
| 970 | } else { |
| 971 | if ((laarr[c + 1].extLength >> 30) == |
| 972 | (EXT_NOT_RECORDED_ALLOCATED >> 30)) { |
| 973 | start = c + 1; |
| 974 | length = currlength = |
| 975 | (((laarr[c + 1].extLength & |
| 976 | UDF_EXTENT_LENGTH_MASK) + |
| 977 | inode->i_sb->s_blocksize - 1) >> |
| 978 | inode->i_sb->s_blocksize_bits); |
| 979 | } else |
| 980 | start = c; |
| 981 | } |
| 982 | |
| 983 | for (i = start + 1; i <= *endnum; i++) { |
| 984 | if (i == *endnum) { |
| 985 | if (lastblock) |
| 986 | length += UDF_DEFAULT_PREALLOC_BLOCKS; |
| 987 | } else if ((laarr[i].extLength >> 30) == |
| 988 | (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) { |
| 989 | length += (((laarr[i].extLength & |
| 990 | UDF_EXTENT_LENGTH_MASK) + |
| 991 | inode->i_sb->s_blocksize - 1) >> |
| 992 | inode->i_sb->s_blocksize_bits); |
| 993 | } else |
| 994 | break; |
| 995 | } |
| 996 | |
| 997 | if (length) { |
| 998 | int next = laarr[start].extLocation.logicalBlockNum + |
| 999 | (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1000 | inode->i_sb->s_blocksize - 1) >> |
| 1001 | inode->i_sb->s_blocksize_bits); |
| 1002 | int numalloc = udf_prealloc_blocks(inode->i_sb, inode, |
| 1003 | laarr[start].extLocation.partitionReferenceNum, |
| 1004 | next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? |
| 1005 | length : UDF_DEFAULT_PREALLOC_BLOCKS) - |
| 1006 | currlength); |
| 1007 | if (numalloc) { |
| 1008 | if (start == (c + 1)) |
| 1009 | laarr[start].extLength += |
| 1010 | (numalloc << |
| 1011 | inode->i_sb->s_blocksize_bits); |
| 1012 | else { |
| 1013 | memmove(&laarr[c + 2], &laarr[c + 1], |
| 1014 | sizeof(struct long_ad) * (*endnum - (c + 1))); |
| 1015 | (*endnum)++; |
| 1016 | laarr[c + 1].extLocation.logicalBlockNum = next; |
| 1017 | laarr[c + 1].extLocation.partitionReferenceNum = |
| 1018 | laarr[c].extLocation. |
| 1019 | partitionReferenceNum; |
| 1020 | laarr[c + 1].extLength = |
| 1021 | EXT_NOT_RECORDED_ALLOCATED | |
| 1022 | (numalloc << |
| 1023 | inode->i_sb->s_blocksize_bits); |
| 1024 | start = c + 1; |
| 1025 | } |
| 1026 | |
| 1027 | for (i = start + 1; numalloc && i < *endnum; i++) { |
| 1028 | int elen = ((laarr[i].extLength & |
| 1029 | UDF_EXTENT_LENGTH_MASK) + |
| 1030 | inode->i_sb->s_blocksize - 1) >> |
| 1031 | inode->i_sb->s_blocksize_bits; |
| 1032 | |
| 1033 | if (elen > numalloc) { |
| 1034 | laarr[i].extLength -= |
| 1035 | (numalloc << |
| 1036 | inode->i_sb->s_blocksize_bits); |
| 1037 | numalloc = 0; |
| 1038 | } else { |
| 1039 | numalloc -= elen; |
| 1040 | if (*endnum > (i + 1)) |
| 1041 | memmove(&laarr[i], |
| 1042 | &laarr[i + 1], |
| 1043 | sizeof(struct long_ad) * |
| 1044 | (*endnum - (i + 1))); |
| 1045 | i--; |
| 1046 | (*endnum)--; |
| 1047 | } |
| 1048 | } |
| 1049 | UDF_I(inode)->i_lenExtents += |
| 1050 | numalloc << inode->i_sb->s_blocksize_bits; |
| 1051 | } |
| 1052 | } |
| 1053 | } |
| 1054 | |
| 1055 | static void udf_merge_extents(struct inode *inode, |
| 1056 | struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], |
| 1057 | int *endnum) |
| 1058 | { |
| 1059 | int i; |
| 1060 | unsigned long blocksize = inode->i_sb->s_blocksize; |
| 1061 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
| 1062 | |
| 1063 | for (i = 0; i < (*endnum - 1); i++) { |
| 1064 | struct kernel_long_ad *li /*l[i]*/ = &laarr[i]; |
| 1065 | struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1]; |
| 1066 | |
| 1067 | if (((li->extLength >> 30) == (lip1->extLength >> 30)) && |
| 1068 | (((li->extLength >> 30) == |
| 1069 | (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) || |
| 1070 | ((lip1->extLocation.logicalBlockNum - |
| 1071 | li->extLocation.logicalBlockNum) == |
| 1072 | (((li->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1073 | blocksize - 1) >> blocksize_bits)))) { |
| 1074 | |
| 1075 | if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1076 | (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1077 | blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { |
| 1078 | lip1->extLength = (lip1->extLength - |
| 1079 | (li->extLength & |
| 1080 | UDF_EXTENT_LENGTH_MASK) + |
| 1081 | UDF_EXTENT_LENGTH_MASK) & |
| 1082 | ~(blocksize - 1); |
| 1083 | li->extLength = (li->extLength & |
| 1084 | UDF_EXTENT_FLAG_MASK) + |
| 1085 | (UDF_EXTENT_LENGTH_MASK + 1) - |
| 1086 | blocksize; |
| 1087 | lip1->extLocation.logicalBlockNum = |
| 1088 | li->extLocation.logicalBlockNum + |
| 1089 | ((li->extLength & |
| 1090 | UDF_EXTENT_LENGTH_MASK) >> |
| 1091 | blocksize_bits); |
| 1092 | } else { |
| 1093 | li->extLength = lip1->extLength + |
| 1094 | (((li->extLength & |
| 1095 | UDF_EXTENT_LENGTH_MASK) + |
| 1096 | blocksize - 1) & ~(blocksize - 1)); |
| 1097 | if (*endnum > (i + 2)) |
| 1098 | memmove(&laarr[i + 1], &laarr[i + 2], |
| 1099 | sizeof(struct long_ad) * |
| 1100 | (*endnum - (i + 2))); |
| 1101 | i--; |
| 1102 | (*endnum)--; |
| 1103 | } |
| 1104 | } else if (((li->extLength >> 30) == |
| 1105 | (EXT_NOT_RECORDED_ALLOCATED >> 30)) && |
| 1106 | ((lip1->extLength >> 30) == |
| 1107 | (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) { |
| 1108 | udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0, |
| 1109 | ((li->extLength & |
| 1110 | UDF_EXTENT_LENGTH_MASK) + |
| 1111 | blocksize - 1) >> blocksize_bits); |
| 1112 | li->extLocation.logicalBlockNum = 0; |
| 1113 | li->extLocation.partitionReferenceNum = 0; |
| 1114 | |
| 1115 | if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1116 | (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + |
| 1117 | blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { |
| 1118 | lip1->extLength = (lip1->extLength - |
| 1119 | (li->extLength & |
| 1120 | UDF_EXTENT_LENGTH_MASK) + |
| 1121 | UDF_EXTENT_LENGTH_MASK) & |
| 1122 | ~(blocksize - 1); |
| 1123 | li->extLength = (li->extLength & |
| 1124 | UDF_EXTENT_FLAG_MASK) + |
| 1125 | (UDF_EXTENT_LENGTH_MASK + 1) - |
| 1126 | blocksize; |
| 1127 | } else { |
| 1128 | li->extLength = lip1->extLength + |
| 1129 | (((li->extLength & |
| 1130 | UDF_EXTENT_LENGTH_MASK) + |
| 1131 | blocksize - 1) & ~(blocksize - 1)); |
| 1132 | if (*endnum > (i + 2)) |
| 1133 | memmove(&laarr[i + 1], &laarr[i + 2], |
| 1134 | sizeof(struct long_ad) * |
| 1135 | (*endnum - (i + 2))); |
| 1136 | i--; |
| 1137 | (*endnum)--; |
| 1138 | } |
| 1139 | } else if ((li->extLength >> 30) == |
| 1140 | (EXT_NOT_RECORDED_ALLOCATED >> 30)) { |
| 1141 | udf_free_blocks(inode->i_sb, inode, |
| 1142 | &li->extLocation, 0, |
| 1143 | ((li->extLength & |
| 1144 | UDF_EXTENT_LENGTH_MASK) + |
| 1145 | blocksize - 1) >> blocksize_bits); |
| 1146 | li->extLocation.logicalBlockNum = 0; |
| 1147 | li->extLocation.partitionReferenceNum = 0; |
| 1148 | li->extLength = (li->extLength & |
| 1149 | UDF_EXTENT_LENGTH_MASK) | |
| 1150 | EXT_NOT_RECORDED_NOT_ALLOCATED; |
| 1151 | } |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | static void udf_update_extents(struct inode *inode, |
| 1156 | struct kernel_long_ad laarr[EXTENT_MERGE_SIZE], |
| 1157 | int startnum, int endnum, |
| 1158 | struct extent_position *epos) |
| 1159 | { |
| 1160 | int start = 0, i; |
| 1161 | struct kernel_lb_addr tmploc; |
| 1162 | uint32_t tmplen; |
| 1163 | |
| 1164 | if (startnum > endnum) { |
| 1165 | for (i = 0; i < (startnum - endnum); i++) |
| 1166 | udf_delete_aext(inode, *epos, laarr[i].extLocation, |
| 1167 | laarr[i].extLength); |
| 1168 | } else if (startnum < endnum) { |
| 1169 | for (i = 0; i < (endnum - startnum); i++) { |
| 1170 | udf_insert_aext(inode, *epos, laarr[i].extLocation, |
| 1171 | laarr[i].extLength); |
| 1172 | udf_next_aext(inode, epos, &laarr[i].extLocation, |
| 1173 | &laarr[i].extLength, 1); |
| 1174 | start++; |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | for (i = start; i < endnum; i++) { |
| 1179 | udf_next_aext(inode, epos, &tmploc, &tmplen, 0); |
| 1180 | udf_write_aext(inode, epos, &laarr[i].extLocation, |
| 1181 | laarr[i].extLength, 1); |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | struct buffer_head *udf_bread(struct inode *inode, int block, |
| 1186 | int create, int *err) |
| 1187 | { |
| 1188 | struct buffer_head *bh = NULL; |
| 1189 | |
| 1190 | bh = udf_getblk(inode, block, create, err); |
| 1191 | if (!bh) |
| 1192 | return NULL; |
| 1193 | |
| 1194 | if (buffer_uptodate(bh)) |
| 1195 | return bh; |
| 1196 | |
| 1197 | ll_rw_block(READ, 1, &bh); |
| 1198 | |
| 1199 | wait_on_buffer(bh); |
| 1200 | if (buffer_uptodate(bh)) |
| 1201 | return bh; |
| 1202 | |
| 1203 | brelse(bh); |
| 1204 | *err = -EIO; |
| 1205 | return NULL; |
| 1206 | } |
| 1207 | |
| 1208 | int udf_setsize(struct inode *inode, loff_t newsize) |
| 1209 | { |
| 1210 | int err; |
| 1211 | struct udf_inode_info *iinfo; |
| 1212 | int bsize = 1 << inode->i_blkbits; |
| 1213 | |
| 1214 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 1215 | S_ISLNK(inode->i_mode))) |
| 1216 | return -EINVAL; |
| 1217 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 1218 | return -EPERM; |
| 1219 | |
| 1220 | iinfo = UDF_I(inode); |
| 1221 | if (newsize > inode->i_size) { |
| 1222 | down_write(&iinfo->i_data_sem); |
| 1223 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 1224 | if (bsize < |
| 1225 | (udf_file_entry_alloc_offset(inode) + newsize)) { |
| 1226 | err = udf_expand_file_adinicb(inode); |
| 1227 | if (err) |
| 1228 | return err; |
| 1229 | down_write(&iinfo->i_data_sem); |
| 1230 | } else { |
| 1231 | iinfo->i_lenAlloc = newsize; |
| 1232 | goto set_size; |
| 1233 | } |
| 1234 | } |
| 1235 | err = udf_extend_file(inode, newsize); |
| 1236 | if (err) { |
| 1237 | up_write(&iinfo->i_data_sem); |
| 1238 | return err; |
| 1239 | } |
| 1240 | set_size: |
| 1241 | truncate_setsize(inode, newsize); |
| 1242 | up_write(&iinfo->i_data_sem); |
| 1243 | } else { |
| 1244 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
| 1245 | down_write(&iinfo->i_data_sem); |
| 1246 | udf_clear_extent_cache(inode); |
| 1247 | memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize, |
| 1248 | 0x00, bsize - newsize - |
| 1249 | udf_file_entry_alloc_offset(inode)); |
| 1250 | iinfo->i_lenAlloc = newsize; |
| 1251 | truncate_setsize(inode, newsize); |
| 1252 | up_write(&iinfo->i_data_sem); |
| 1253 | goto update_time; |
| 1254 | } |
| 1255 | err = block_truncate_page(inode->i_mapping, newsize, |
| 1256 | udf_get_block); |
| 1257 | if (err) |
| 1258 | return err; |
| 1259 | down_write(&iinfo->i_data_sem); |
| 1260 | udf_clear_extent_cache(inode); |
| 1261 | truncate_setsize(inode, newsize); |
| 1262 | udf_truncate_extents(inode); |
| 1263 | up_write(&iinfo->i_data_sem); |
| 1264 | } |
| 1265 | update_time: |
| 1266 | inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); |
| 1267 | if (IS_SYNC(inode)) |
| 1268 | udf_sync_inode(inode); |
| 1269 | else |
| 1270 | mark_inode_dirty(inode); |
| 1271 | return 0; |
| 1272 | } |
| 1273 | |
| 1274 | static void __udf_read_inode(struct inode *inode) |
| 1275 | { |
| 1276 | struct buffer_head *bh = NULL; |
| 1277 | struct fileEntry *fe; |
| 1278 | uint16_t ident; |
| 1279 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1280 | |
| 1281 | /* |
| 1282 | * Set defaults, but the inode is still incomplete! |
| 1283 | * Note: get_new_inode() sets the following on a new inode: |
| 1284 | * i_sb = sb |
| 1285 | * i_no = ino |
| 1286 | * i_flags = sb->s_flags |
| 1287 | * i_state = 0 |
| 1288 | * clean_inode(): zero fills and sets |
| 1289 | * i_count = 1 |
| 1290 | * i_nlink = 1 |
| 1291 | * i_op = NULL; |
| 1292 | */ |
| 1293 | bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident); |
| 1294 | if (!bh) { |
| 1295 | udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino); |
| 1296 | make_bad_inode(inode); |
| 1297 | return; |
| 1298 | } |
| 1299 | |
| 1300 | if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE && |
| 1301 | ident != TAG_IDENT_USE) { |
| 1302 | udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n", |
| 1303 | inode->i_ino, ident); |
| 1304 | brelse(bh); |
| 1305 | make_bad_inode(inode); |
| 1306 | return; |
| 1307 | } |
| 1308 | |
| 1309 | fe = (struct fileEntry *)bh->b_data; |
| 1310 | |
| 1311 | if (fe->icbTag.strategyType == cpu_to_le16(4096)) { |
| 1312 | struct buffer_head *ibh; |
| 1313 | |
| 1314 | ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1, |
| 1315 | &ident); |
| 1316 | if (ident == TAG_IDENT_IE && ibh) { |
| 1317 | struct buffer_head *nbh = NULL; |
| 1318 | struct kernel_lb_addr loc; |
| 1319 | struct indirectEntry *ie; |
| 1320 | |
| 1321 | ie = (struct indirectEntry *)ibh->b_data; |
| 1322 | loc = lelb_to_cpu(ie->indirectICB.extLocation); |
| 1323 | |
| 1324 | if (ie->indirectICB.extLength && |
| 1325 | (nbh = udf_read_ptagged(inode->i_sb, &loc, 0, |
| 1326 | &ident))) { |
| 1327 | if (ident == TAG_IDENT_FE || |
| 1328 | ident == TAG_IDENT_EFE) { |
| 1329 | memcpy(&iinfo->i_location, |
| 1330 | &loc, |
| 1331 | sizeof(struct kernel_lb_addr)); |
| 1332 | brelse(bh); |
| 1333 | brelse(ibh); |
| 1334 | brelse(nbh); |
| 1335 | __udf_read_inode(inode); |
| 1336 | return; |
| 1337 | } |
| 1338 | brelse(nbh); |
| 1339 | } |
| 1340 | } |
| 1341 | brelse(ibh); |
| 1342 | } else if (fe->icbTag.strategyType != cpu_to_le16(4)) { |
| 1343 | udf_err(inode->i_sb, "unsupported strategy type: %d\n", |
| 1344 | le16_to_cpu(fe->icbTag.strategyType)); |
| 1345 | brelse(bh); |
| 1346 | make_bad_inode(inode); |
| 1347 | return; |
| 1348 | } |
| 1349 | udf_fill_inode(inode, bh); |
| 1350 | |
| 1351 | brelse(bh); |
| 1352 | } |
| 1353 | |
| 1354 | static void udf_fill_inode(struct inode *inode, struct buffer_head *bh) |
| 1355 | { |
| 1356 | struct fileEntry *fe; |
| 1357 | struct extendedFileEntry *efe; |
| 1358 | struct udf_sb_info *sbi = UDF_SB(inode->i_sb); |
| 1359 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1360 | unsigned int link_count; |
| 1361 | |
| 1362 | fe = (struct fileEntry *)bh->b_data; |
| 1363 | efe = (struct extendedFileEntry *)bh->b_data; |
| 1364 | |
| 1365 | if (fe->icbTag.strategyType == cpu_to_le16(4)) |
| 1366 | iinfo->i_strat4096 = 0; |
| 1367 | else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */ |
| 1368 | iinfo->i_strat4096 = 1; |
| 1369 | |
| 1370 | iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) & |
| 1371 | ICBTAG_FLAG_AD_MASK; |
| 1372 | iinfo->i_unique = 0; |
| 1373 | iinfo->i_lenEAttr = 0; |
| 1374 | iinfo->i_lenExtents = 0; |
| 1375 | iinfo->i_lenAlloc = 0; |
| 1376 | iinfo->i_next_alloc_block = 0; |
| 1377 | iinfo->i_next_alloc_goal = 0; |
| 1378 | if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) { |
| 1379 | iinfo->i_efe = 1; |
| 1380 | iinfo->i_use = 0; |
| 1381 | if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - |
| 1382 | sizeof(struct extendedFileEntry))) { |
| 1383 | make_bad_inode(inode); |
| 1384 | return; |
| 1385 | } |
| 1386 | memcpy(iinfo->i_ext.i_data, |
| 1387 | bh->b_data + sizeof(struct extendedFileEntry), |
| 1388 | inode->i_sb->s_blocksize - |
| 1389 | sizeof(struct extendedFileEntry)); |
| 1390 | } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) { |
| 1391 | iinfo->i_efe = 0; |
| 1392 | iinfo->i_use = 0; |
| 1393 | if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - |
| 1394 | sizeof(struct fileEntry))) { |
| 1395 | make_bad_inode(inode); |
| 1396 | return; |
| 1397 | } |
| 1398 | memcpy(iinfo->i_ext.i_data, |
| 1399 | bh->b_data + sizeof(struct fileEntry), |
| 1400 | inode->i_sb->s_blocksize - sizeof(struct fileEntry)); |
| 1401 | } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) { |
| 1402 | iinfo->i_efe = 0; |
| 1403 | iinfo->i_use = 1; |
| 1404 | iinfo->i_lenAlloc = le32_to_cpu( |
| 1405 | ((struct unallocSpaceEntry *)bh->b_data)-> |
| 1406 | lengthAllocDescs); |
| 1407 | if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - |
| 1408 | sizeof(struct unallocSpaceEntry))) { |
| 1409 | make_bad_inode(inode); |
| 1410 | return; |
| 1411 | } |
| 1412 | memcpy(iinfo->i_ext.i_data, |
| 1413 | bh->b_data + sizeof(struct unallocSpaceEntry), |
| 1414 | inode->i_sb->s_blocksize - |
| 1415 | sizeof(struct unallocSpaceEntry)); |
| 1416 | return; |
| 1417 | } |
| 1418 | |
| 1419 | read_lock(&sbi->s_cred_lock); |
| 1420 | i_uid_write(inode, le32_to_cpu(fe->uid)); |
| 1421 | if (!uid_valid(inode->i_uid) || |
| 1422 | UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) || |
| 1423 | UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET)) |
| 1424 | inode->i_uid = UDF_SB(inode->i_sb)->s_uid; |
| 1425 | |
| 1426 | i_gid_write(inode, le32_to_cpu(fe->gid)); |
| 1427 | if (!gid_valid(inode->i_gid) || |
| 1428 | UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) || |
| 1429 | UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET)) |
| 1430 | inode->i_gid = UDF_SB(inode->i_sb)->s_gid; |
| 1431 | |
| 1432 | if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY && |
| 1433 | sbi->s_fmode != UDF_INVALID_MODE) |
| 1434 | inode->i_mode = sbi->s_fmode; |
| 1435 | else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY && |
| 1436 | sbi->s_dmode != UDF_INVALID_MODE) |
| 1437 | inode->i_mode = sbi->s_dmode; |
| 1438 | else |
| 1439 | inode->i_mode = udf_convert_permissions(fe); |
| 1440 | inode->i_mode &= ~sbi->s_umask; |
| 1441 | read_unlock(&sbi->s_cred_lock); |
| 1442 | |
| 1443 | link_count = le16_to_cpu(fe->fileLinkCount); |
| 1444 | if (!link_count) |
| 1445 | link_count = 1; |
| 1446 | set_nlink(inode, link_count); |
| 1447 | |
| 1448 | inode->i_size = le64_to_cpu(fe->informationLength); |
| 1449 | iinfo->i_lenExtents = inode->i_size; |
| 1450 | |
| 1451 | if (iinfo->i_efe == 0) { |
| 1452 | inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << |
| 1453 | (inode->i_sb->s_blocksize_bits - 9); |
| 1454 | |
| 1455 | if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime)) |
| 1456 | inode->i_atime = sbi->s_record_time; |
| 1457 | |
| 1458 | if (!udf_disk_stamp_to_time(&inode->i_mtime, |
| 1459 | fe->modificationTime)) |
| 1460 | inode->i_mtime = sbi->s_record_time; |
| 1461 | |
| 1462 | if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime)) |
| 1463 | inode->i_ctime = sbi->s_record_time; |
| 1464 | |
| 1465 | iinfo->i_unique = le64_to_cpu(fe->uniqueID); |
| 1466 | iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); |
| 1467 | iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs); |
| 1468 | iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint); |
| 1469 | } else { |
| 1470 | inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << |
| 1471 | (inode->i_sb->s_blocksize_bits - 9); |
| 1472 | |
| 1473 | if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime)) |
| 1474 | inode->i_atime = sbi->s_record_time; |
| 1475 | |
| 1476 | if (!udf_disk_stamp_to_time(&inode->i_mtime, |
| 1477 | efe->modificationTime)) |
| 1478 | inode->i_mtime = sbi->s_record_time; |
| 1479 | |
| 1480 | if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime)) |
| 1481 | iinfo->i_crtime = sbi->s_record_time; |
| 1482 | |
| 1483 | if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime)) |
| 1484 | inode->i_ctime = sbi->s_record_time; |
| 1485 | |
| 1486 | iinfo->i_unique = le64_to_cpu(efe->uniqueID); |
| 1487 | iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); |
| 1488 | iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs); |
| 1489 | iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); |
| 1490 | } |
| 1491 | |
| 1492 | switch (fe->icbTag.fileType) { |
| 1493 | case ICBTAG_FILE_TYPE_DIRECTORY: |
| 1494 | inode->i_op = &udf_dir_inode_operations; |
| 1495 | inode->i_fop = &udf_dir_operations; |
| 1496 | inode->i_mode |= S_IFDIR; |
| 1497 | inc_nlink(inode); |
| 1498 | break; |
| 1499 | case ICBTAG_FILE_TYPE_REALTIME: |
| 1500 | case ICBTAG_FILE_TYPE_REGULAR: |
| 1501 | case ICBTAG_FILE_TYPE_UNDEF: |
| 1502 | case ICBTAG_FILE_TYPE_VAT20: |
| 1503 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1504 | inode->i_data.a_ops = &udf_adinicb_aops; |
| 1505 | else |
| 1506 | inode->i_data.a_ops = &udf_aops; |
| 1507 | inode->i_op = &udf_file_inode_operations; |
| 1508 | inode->i_fop = &udf_file_operations; |
| 1509 | inode->i_mode |= S_IFREG; |
| 1510 | break; |
| 1511 | case ICBTAG_FILE_TYPE_BLOCK: |
| 1512 | inode->i_mode |= S_IFBLK; |
| 1513 | break; |
| 1514 | case ICBTAG_FILE_TYPE_CHAR: |
| 1515 | inode->i_mode |= S_IFCHR; |
| 1516 | break; |
| 1517 | case ICBTAG_FILE_TYPE_FIFO: |
| 1518 | init_special_inode(inode, inode->i_mode | S_IFIFO, 0); |
| 1519 | break; |
| 1520 | case ICBTAG_FILE_TYPE_SOCKET: |
| 1521 | init_special_inode(inode, inode->i_mode | S_IFSOCK, 0); |
| 1522 | break; |
| 1523 | case ICBTAG_FILE_TYPE_SYMLINK: |
| 1524 | inode->i_data.a_ops = &udf_symlink_aops; |
| 1525 | inode->i_op = &udf_symlink_inode_operations; |
| 1526 | inode->i_mode = S_IFLNK | S_IRWXUGO; |
| 1527 | break; |
| 1528 | case ICBTAG_FILE_TYPE_MAIN: |
| 1529 | udf_debug("METADATA FILE-----\n"); |
| 1530 | break; |
| 1531 | case ICBTAG_FILE_TYPE_MIRROR: |
| 1532 | udf_debug("METADATA MIRROR FILE-----\n"); |
| 1533 | break; |
| 1534 | case ICBTAG_FILE_TYPE_BITMAP: |
| 1535 | udf_debug("METADATA BITMAP FILE-----\n"); |
| 1536 | break; |
| 1537 | default: |
| 1538 | udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n", |
| 1539 | inode->i_ino, fe->icbTag.fileType); |
| 1540 | make_bad_inode(inode); |
| 1541 | return; |
| 1542 | } |
| 1543 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
| 1544 | struct deviceSpec *dsea = |
| 1545 | (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); |
| 1546 | if (dsea) { |
| 1547 | init_special_inode(inode, inode->i_mode, |
| 1548 | MKDEV(le32_to_cpu(dsea->majorDeviceIdent), |
| 1549 | le32_to_cpu(dsea->minorDeviceIdent))); |
| 1550 | /* Developer ID ??? */ |
| 1551 | } else |
| 1552 | make_bad_inode(inode); |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | static int udf_alloc_i_data(struct inode *inode, size_t size) |
| 1557 | { |
| 1558 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1559 | iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL); |
| 1560 | |
| 1561 | if (!iinfo->i_ext.i_data) { |
| 1562 | udf_err(inode->i_sb, "(ino %ld) no free memory\n", |
| 1563 | inode->i_ino); |
| 1564 | return -ENOMEM; |
| 1565 | } |
| 1566 | |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | static umode_t udf_convert_permissions(struct fileEntry *fe) |
| 1571 | { |
| 1572 | umode_t mode; |
| 1573 | uint32_t permissions; |
| 1574 | uint32_t flags; |
| 1575 | |
| 1576 | permissions = le32_to_cpu(fe->permissions); |
| 1577 | flags = le16_to_cpu(fe->icbTag.flags); |
| 1578 | |
| 1579 | mode = ((permissions) & S_IRWXO) | |
| 1580 | ((permissions >> 2) & S_IRWXG) | |
| 1581 | ((permissions >> 4) & S_IRWXU) | |
| 1582 | ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) | |
| 1583 | ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) | |
| 1584 | ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0); |
| 1585 | |
| 1586 | return mode; |
| 1587 | } |
| 1588 | |
| 1589 | int udf_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1590 | { |
| 1591 | return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| 1592 | } |
| 1593 | |
| 1594 | static int udf_sync_inode(struct inode *inode) |
| 1595 | { |
| 1596 | return udf_update_inode(inode, 1); |
| 1597 | } |
| 1598 | |
| 1599 | static int udf_update_inode(struct inode *inode, int do_sync) |
| 1600 | { |
| 1601 | struct buffer_head *bh = NULL; |
| 1602 | struct fileEntry *fe; |
| 1603 | struct extendedFileEntry *efe; |
| 1604 | uint64_t lb_recorded; |
| 1605 | uint32_t udfperms; |
| 1606 | uint16_t icbflags; |
| 1607 | uint16_t crclen; |
| 1608 | int err = 0; |
| 1609 | struct udf_sb_info *sbi = UDF_SB(inode->i_sb); |
| 1610 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
| 1611 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1612 | |
| 1613 | bh = udf_tgetblk(inode->i_sb, |
| 1614 | udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0)); |
| 1615 | if (!bh) { |
| 1616 | udf_debug("getblk failure\n"); |
| 1617 | return -ENOMEM; |
| 1618 | } |
| 1619 | |
| 1620 | lock_buffer(bh); |
| 1621 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); |
| 1622 | fe = (struct fileEntry *)bh->b_data; |
| 1623 | efe = (struct extendedFileEntry *)bh->b_data; |
| 1624 | |
| 1625 | if (iinfo->i_use) { |
| 1626 | struct unallocSpaceEntry *use = |
| 1627 | (struct unallocSpaceEntry *)bh->b_data; |
| 1628 | |
| 1629 | use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); |
| 1630 | memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), |
| 1631 | iinfo->i_ext.i_data, inode->i_sb->s_blocksize - |
| 1632 | sizeof(struct unallocSpaceEntry)); |
| 1633 | use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE); |
| 1634 | use->descTag.tagLocation = |
| 1635 | cpu_to_le32(iinfo->i_location.logicalBlockNum); |
| 1636 | crclen = sizeof(struct unallocSpaceEntry) + |
| 1637 | iinfo->i_lenAlloc - sizeof(struct tag); |
| 1638 | use->descTag.descCRCLength = cpu_to_le16(crclen); |
| 1639 | use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use + |
| 1640 | sizeof(struct tag), |
| 1641 | crclen)); |
| 1642 | use->descTag.tagChecksum = udf_tag_checksum(&use->descTag); |
| 1643 | |
| 1644 | goto out; |
| 1645 | } |
| 1646 | |
| 1647 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET)) |
| 1648 | fe->uid = cpu_to_le32(-1); |
| 1649 | else |
| 1650 | fe->uid = cpu_to_le32(i_uid_read(inode)); |
| 1651 | |
| 1652 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET)) |
| 1653 | fe->gid = cpu_to_le32(-1); |
| 1654 | else |
| 1655 | fe->gid = cpu_to_le32(i_gid_read(inode)); |
| 1656 | |
| 1657 | udfperms = ((inode->i_mode & S_IRWXO)) | |
| 1658 | ((inode->i_mode & S_IRWXG) << 2) | |
| 1659 | ((inode->i_mode & S_IRWXU) << 4); |
| 1660 | |
| 1661 | udfperms |= (le32_to_cpu(fe->permissions) & |
| 1662 | (FE_PERM_O_DELETE | FE_PERM_O_CHATTR | |
| 1663 | FE_PERM_G_DELETE | FE_PERM_G_CHATTR | |
| 1664 | FE_PERM_U_DELETE | FE_PERM_U_CHATTR)); |
| 1665 | fe->permissions = cpu_to_le32(udfperms); |
| 1666 | |
| 1667 | if (S_ISDIR(inode->i_mode)) |
| 1668 | fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1); |
| 1669 | else |
| 1670 | fe->fileLinkCount = cpu_to_le16(inode->i_nlink); |
| 1671 | |
| 1672 | fe->informationLength = cpu_to_le64(inode->i_size); |
| 1673 | |
| 1674 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
| 1675 | struct regid *eid; |
| 1676 | struct deviceSpec *dsea = |
| 1677 | (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1); |
| 1678 | if (!dsea) { |
| 1679 | dsea = (struct deviceSpec *) |
| 1680 | udf_add_extendedattr(inode, |
| 1681 | sizeof(struct deviceSpec) + |
| 1682 | sizeof(struct regid), 12, 0x3); |
| 1683 | dsea->attrType = cpu_to_le32(12); |
| 1684 | dsea->attrSubtype = 1; |
| 1685 | dsea->attrLength = cpu_to_le32( |
| 1686 | sizeof(struct deviceSpec) + |
| 1687 | sizeof(struct regid)); |
| 1688 | dsea->impUseLength = cpu_to_le32(sizeof(struct regid)); |
| 1689 | } |
| 1690 | eid = (struct regid *)dsea->impUse; |
| 1691 | memset(eid, 0, sizeof(struct regid)); |
| 1692 | strcpy(eid->ident, UDF_ID_DEVELOPER); |
| 1693 | eid->identSuffix[0] = UDF_OS_CLASS_UNIX; |
| 1694 | eid->identSuffix[1] = UDF_OS_ID_LINUX; |
| 1695 | dsea->majorDeviceIdent = cpu_to_le32(imajor(inode)); |
| 1696 | dsea->minorDeviceIdent = cpu_to_le32(iminor(inode)); |
| 1697 | } |
| 1698 | |
| 1699 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
| 1700 | lb_recorded = 0; /* No extents => no blocks! */ |
| 1701 | else |
| 1702 | lb_recorded = |
| 1703 | (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >> |
| 1704 | (blocksize_bits - 9); |
| 1705 | |
| 1706 | if (iinfo->i_efe == 0) { |
| 1707 | memcpy(bh->b_data + sizeof(struct fileEntry), |
| 1708 | iinfo->i_ext.i_data, |
| 1709 | inode->i_sb->s_blocksize - sizeof(struct fileEntry)); |
| 1710 | fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); |
| 1711 | |
| 1712 | udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime); |
| 1713 | udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime); |
| 1714 | udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime); |
| 1715 | memset(&(fe->impIdent), 0, sizeof(struct regid)); |
| 1716 | strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); |
| 1717 | fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
| 1718 | fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
| 1719 | fe->uniqueID = cpu_to_le64(iinfo->i_unique); |
| 1720 | fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); |
| 1721 | fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); |
| 1722 | fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); |
| 1723 | fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE); |
| 1724 | crclen = sizeof(struct fileEntry); |
| 1725 | } else { |
| 1726 | memcpy(bh->b_data + sizeof(struct extendedFileEntry), |
| 1727 | iinfo->i_ext.i_data, |
| 1728 | inode->i_sb->s_blocksize - |
| 1729 | sizeof(struct extendedFileEntry)); |
| 1730 | efe->objectSize = cpu_to_le64(inode->i_size); |
| 1731 | efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); |
| 1732 | |
| 1733 | if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec || |
| 1734 | (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec && |
| 1735 | iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec)) |
| 1736 | iinfo->i_crtime = inode->i_atime; |
| 1737 | |
| 1738 | if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec || |
| 1739 | (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec && |
| 1740 | iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec)) |
| 1741 | iinfo->i_crtime = inode->i_mtime; |
| 1742 | |
| 1743 | if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec || |
| 1744 | (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec && |
| 1745 | iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec)) |
| 1746 | iinfo->i_crtime = inode->i_ctime; |
| 1747 | |
| 1748 | udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime); |
| 1749 | udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime); |
| 1750 | udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime); |
| 1751 | udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime); |
| 1752 | |
| 1753 | memset(&(efe->impIdent), 0, sizeof(struct regid)); |
| 1754 | strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); |
| 1755 | efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
| 1756 | efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
| 1757 | efe->uniqueID = cpu_to_le64(iinfo->i_unique); |
| 1758 | efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr); |
| 1759 | efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc); |
| 1760 | efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint); |
| 1761 | efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE); |
| 1762 | crclen = sizeof(struct extendedFileEntry); |
| 1763 | } |
| 1764 | if (iinfo->i_strat4096) { |
| 1765 | fe->icbTag.strategyType = cpu_to_le16(4096); |
| 1766 | fe->icbTag.strategyParameter = cpu_to_le16(1); |
| 1767 | fe->icbTag.numEntries = cpu_to_le16(2); |
| 1768 | } else { |
| 1769 | fe->icbTag.strategyType = cpu_to_le16(4); |
| 1770 | fe->icbTag.numEntries = cpu_to_le16(1); |
| 1771 | } |
| 1772 | |
| 1773 | if (S_ISDIR(inode->i_mode)) |
| 1774 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY; |
| 1775 | else if (S_ISREG(inode->i_mode)) |
| 1776 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR; |
| 1777 | else if (S_ISLNK(inode->i_mode)) |
| 1778 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK; |
| 1779 | else if (S_ISBLK(inode->i_mode)) |
| 1780 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK; |
| 1781 | else if (S_ISCHR(inode->i_mode)) |
| 1782 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR; |
| 1783 | else if (S_ISFIFO(inode->i_mode)) |
| 1784 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO; |
| 1785 | else if (S_ISSOCK(inode->i_mode)) |
| 1786 | fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET; |
| 1787 | |
| 1788 | icbflags = iinfo->i_alloc_type | |
| 1789 | ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) | |
| 1790 | ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) | |
| 1791 | ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) | |
| 1792 | (le16_to_cpu(fe->icbTag.flags) & |
| 1793 | ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID | |
| 1794 | ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY)); |
| 1795 | |
| 1796 | fe->icbTag.flags = cpu_to_le16(icbflags); |
| 1797 | if (sbi->s_udfrev >= 0x0200) |
| 1798 | fe->descTag.descVersion = cpu_to_le16(3); |
| 1799 | else |
| 1800 | fe->descTag.descVersion = cpu_to_le16(2); |
| 1801 | fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number); |
| 1802 | fe->descTag.tagLocation = cpu_to_le32( |
| 1803 | iinfo->i_location.logicalBlockNum); |
| 1804 | crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag); |
| 1805 | fe->descTag.descCRCLength = cpu_to_le16(crclen); |
| 1806 | fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag), |
| 1807 | crclen)); |
| 1808 | fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag); |
| 1809 | |
| 1810 | out: |
| 1811 | set_buffer_uptodate(bh); |
| 1812 | unlock_buffer(bh); |
| 1813 | |
| 1814 | /* write the data blocks */ |
| 1815 | mark_buffer_dirty(bh); |
| 1816 | if (do_sync) { |
| 1817 | sync_dirty_buffer(bh); |
| 1818 | if (buffer_write_io_error(bh)) { |
| 1819 | udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n", |
| 1820 | inode->i_ino); |
| 1821 | err = -EIO; |
| 1822 | } |
| 1823 | } |
| 1824 | brelse(bh); |
| 1825 | |
| 1826 | return err; |
| 1827 | } |
| 1828 | |
| 1829 | struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino) |
| 1830 | { |
| 1831 | unsigned long block = udf_get_lb_pblock(sb, ino, 0); |
| 1832 | struct inode *inode = iget_locked(sb, block); |
| 1833 | |
| 1834 | if (!inode) |
| 1835 | return NULL; |
| 1836 | |
| 1837 | if (inode->i_state & I_NEW) { |
| 1838 | memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr)); |
| 1839 | __udf_read_inode(inode); |
| 1840 | unlock_new_inode(inode); |
| 1841 | } |
| 1842 | |
| 1843 | if (is_bad_inode(inode)) |
| 1844 | goto out_iput; |
| 1845 | |
| 1846 | if (ino->logicalBlockNum >= UDF_SB(sb)-> |
| 1847 | s_partmaps[ino->partitionReferenceNum].s_partition_len) { |
| 1848 | udf_debug("block=%d, partition=%d out of range\n", |
| 1849 | ino->logicalBlockNum, ino->partitionReferenceNum); |
| 1850 | make_bad_inode(inode); |
| 1851 | goto out_iput; |
| 1852 | } |
| 1853 | |
| 1854 | return inode; |
| 1855 | |
| 1856 | out_iput: |
| 1857 | iput(inode); |
| 1858 | return NULL; |
| 1859 | } |
| 1860 | |
| 1861 | int udf_add_aext(struct inode *inode, struct extent_position *epos, |
| 1862 | struct kernel_lb_addr *eloc, uint32_t elen, int inc) |
| 1863 | { |
| 1864 | int adsize; |
| 1865 | struct short_ad *sad = NULL; |
| 1866 | struct long_ad *lad = NULL; |
| 1867 | struct allocExtDesc *aed; |
| 1868 | uint8_t *ptr; |
| 1869 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1870 | |
| 1871 | if (!epos->bh) |
| 1872 | ptr = iinfo->i_ext.i_data + epos->offset - |
| 1873 | udf_file_entry_alloc_offset(inode) + |
| 1874 | iinfo->i_lenEAttr; |
| 1875 | else |
| 1876 | ptr = epos->bh->b_data + epos->offset; |
| 1877 | |
| 1878 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 1879 | adsize = sizeof(struct short_ad); |
| 1880 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 1881 | adsize = sizeof(struct long_ad); |
| 1882 | else |
| 1883 | return -EIO; |
| 1884 | |
| 1885 | if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) { |
| 1886 | unsigned char *sptr, *dptr; |
| 1887 | struct buffer_head *nbh; |
| 1888 | int err, loffset; |
| 1889 | struct kernel_lb_addr obloc = epos->block; |
| 1890 | |
| 1891 | epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL, |
| 1892 | obloc.partitionReferenceNum, |
| 1893 | obloc.logicalBlockNum, &err); |
| 1894 | if (!epos->block.logicalBlockNum) |
| 1895 | return -ENOSPC; |
| 1896 | nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb, |
| 1897 | &epos->block, |
| 1898 | 0)); |
| 1899 | if (!nbh) |
| 1900 | return -EIO; |
| 1901 | lock_buffer(nbh); |
| 1902 | memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize); |
| 1903 | set_buffer_uptodate(nbh); |
| 1904 | unlock_buffer(nbh); |
| 1905 | mark_buffer_dirty_inode(nbh, inode); |
| 1906 | |
| 1907 | aed = (struct allocExtDesc *)(nbh->b_data); |
| 1908 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
| 1909 | aed->previousAllocExtLocation = |
| 1910 | cpu_to_le32(obloc.logicalBlockNum); |
| 1911 | if (epos->offset + adsize > inode->i_sb->s_blocksize) { |
| 1912 | loffset = epos->offset; |
| 1913 | aed->lengthAllocDescs = cpu_to_le32(adsize); |
| 1914 | sptr = ptr - adsize; |
| 1915 | dptr = nbh->b_data + sizeof(struct allocExtDesc); |
| 1916 | memcpy(dptr, sptr, adsize); |
| 1917 | epos->offset = sizeof(struct allocExtDesc) + adsize; |
| 1918 | } else { |
| 1919 | loffset = epos->offset + adsize; |
| 1920 | aed->lengthAllocDescs = cpu_to_le32(0); |
| 1921 | sptr = ptr; |
| 1922 | epos->offset = sizeof(struct allocExtDesc); |
| 1923 | |
| 1924 | if (epos->bh) { |
| 1925 | aed = (struct allocExtDesc *)epos->bh->b_data; |
| 1926 | le32_add_cpu(&aed->lengthAllocDescs, adsize); |
| 1927 | } else { |
| 1928 | iinfo->i_lenAlloc += adsize; |
| 1929 | mark_inode_dirty(inode); |
| 1930 | } |
| 1931 | } |
| 1932 | if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200) |
| 1933 | udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1, |
| 1934 | epos->block.logicalBlockNum, sizeof(struct tag)); |
| 1935 | else |
| 1936 | udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1, |
| 1937 | epos->block.logicalBlockNum, sizeof(struct tag)); |
| 1938 | switch (iinfo->i_alloc_type) { |
| 1939 | case ICBTAG_FLAG_AD_SHORT: |
| 1940 | sad = (struct short_ad *)sptr; |
| 1941 | sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | |
| 1942 | inode->i_sb->s_blocksize); |
| 1943 | sad->extPosition = |
| 1944 | cpu_to_le32(epos->block.logicalBlockNum); |
| 1945 | break; |
| 1946 | case ICBTAG_FLAG_AD_LONG: |
| 1947 | lad = (struct long_ad *)sptr; |
| 1948 | lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS | |
| 1949 | inode->i_sb->s_blocksize); |
| 1950 | lad->extLocation = cpu_to_lelb(epos->block); |
| 1951 | memset(lad->impUse, 0x00, sizeof(lad->impUse)); |
| 1952 | break; |
| 1953 | } |
| 1954 | if (epos->bh) { |
| 1955 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || |
| 1956 | UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) |
| 1957 | udf_update_tag(epos->bh->b_data, loffset); |
| 1958 | else |
| 1959 | udf_update_tag(epos->bh->b_data, |
| 1960 | sizeof(struct allocExtDesc)); |
| 1961 | mark_buffer_dirty_inode(epos->bh, inode); |
| 1962 | brelse(epos->bh); |
| 1963 | } else { |
| 1964 | mark_inode_dirty(inode); |
| 1965 | } |
| 1966 | epos->bh = nbh; |
| 1967 | } |
| 1968 | |
| 1969 | udf_write_aext(inode, epos, eloc, elen, inc); |
| 1970 | |
| 1971 | if (!epos->bh) { |
| 1972 | iinfo->i_lenAlloc += adsize; |
| 1973 | mark_inode_dirty(inode); |
| 1974 | } else { |
| 1975 | aed = (struct allocExtDesc *)epos->bh->b_data; |
| 1976 | le32_add_cpu(&aed->lengthAllocDescs, adsize); |
| 1977 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || |
| 1978 | UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) |
| 1979 | udf_update_tag(epos->bh->b_data, |
| 1980 | epos->offset + (inc ? 0 : adsize)); |
| 1981 | else |
| 1982 | udf_update_tag(epos->bh->b_data, |
| 1983 | sizeof(struct allocExtDesc)); |
| 1984 | mark_buffer_dirty_inode(epos->bh, inode); |
| 1985 | } |
| 1986 | |
| 1987 | return 0; |
| 1988 | } |
| 1989 | |
| 1990 | void udf_write_aext(struct inode *inode, struct extent_position *epos, |
| 1991 | struct kernel_lb_addr *eloc, uint32_t elen, int inc) |
| 1992 | { |
| 1993 | int adsize; |
| 1994 | uint8_t *ptr; |
| 1995 | struct short_ad *sad; |
| 1996 | struct long_ad *lad; |
| 1997 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 1998 | |
| 1999 | if (!epos->bh) |
| 2000 | ptr = iinfo->i_ext.i_data + epos->offset - |
| 2001 | udf_file_entry_alloc_offset(inode) + |
| 2002 | iinfo->i_lenEAttr; |
| 2003 | else |
| 2004 | ptr = epos->bh->b_data + epos->offset; |
| 2005 | |
| 2006 | switch (iinfo->i_alloc_type) { |
| 2007 | case ICBTAG_FLAG_AD_SHORT: |
| 2008 | sad = (struct short_ad *)ptr; |
| 2009 | sad->extLength = cpu_to_le32(elen); |
| 2010 | sad->extPosition = cpu_to_le32(eloc->logicalBlockNum); |
| 2011 | adsize = sizeof(struct short_ad); |
| 2012 | break; |
| 2013 | case ICBTAG_FLAG_AD_LONG: |
| 2014 | lad = (struct long_ad *)ptr; |
| 2015 | lad->extLength = cpu_to_le32(elen); |
| 2016 | lad->extLocation = cpu_to_lelb(*eloc); |
| 2017 | memset(lad->impUse, 0x00, sizeof(lad->impUse)); |
| 2018 | adsize = sizeof(struct long_ad); |
| 2019 | break; |
| 2020 | default: |
| 2021 | return; |
| 2022 | } |
| 2023 | |
| 2024 | if (epos->bh) { |
| 2025 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || |
| 2026 | UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) { |
| 2027 | struct allocExtDesc *aed = |
| 2028 | (struct allocExtDesc *)epos->bh->b_data; |
| 2029 | udf_update_tag(epos->bh->b_data, |
| 2030 | le32_to_cpu(aed->lengthAllocDescs) + |
| 2031 | sizeof(struct allocExtDesc)); |
| 2032 | } |
| 2033 | mark_buffer_dirty_inode(epos->bh, inode); |
| 2034 | } else { |
| 2035 | mark_inode_dirty(inode); |
| 2036 | } |
| 2037 | |
| 2038 | if (inc) |
| 2039 | epos->offset += adsize; |
| 2040 | } |
| 2041 | |
| 2042 | int8_t udf_next_aext(struct inode *inode, struct extent_position *epos, |
| 2043 | struct kernel_lb_addr *eloc, uint32_t *elen, int inc) |
| 2044 | { |
| 2045 | int8_t etype; |
| 2046 | |
| 2047 | while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) == |
| 2048 | (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) { |
| 2049 | int block; |
| 2050 | epos->block = *eloc; |
| 2051 | epos->offset = sizeof(struct allocExtDesc); |
| 2052 | brelse(epos->bh); |
| 2053 | block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0); |
| 2054 | epos->bh = udf_tread(inode->i_sb, block); |
| 2055 | if (!epos->bh) { |
| 2056 | udf_debug("reading block %d failed!\n", block); |
| 2057 | return -1; |
| 2058 | } |
| 2059 | } |
| 2060 | |
| 2061 | return etype; |
| 2062 | } |
| 2063 | |
| 2064 | int8_t udf_current_aext(struct inode *inode, struct extent_position *epos, |
| 2065 | struct kernel_lb_addr *eloc, uint32_t *elen, int inc) |
| 2066 | { |
| 2067 | int alen; |
| 2068 | int8_t etype; |
| 2069 | uint8_t *ptr; |
| 2070 | struct short_ad *sad; |
| 2071 | struct long_ad *lad; |
| 2072 | struct udf_inode_info *iinfo = UDF_I(inode); |
| 2073 | |
| 2074 | if (!epos->bh) { |
| 2075 | if (!epos->offset) |
| 2076 | epos->offset = udf_file_entry_alloc_offset(inode); |
| 2077 | ptr = iinfo->i_ext.i_data + epos->offset - |
| 2078 | udf_file_entry_alloc_offset(inode) + |
| 2079 | iinfo->i_lenEAttr; |
| 2080 | alen = udf_file_entry_alloc_offset(inode) + |
| 2081 | iinfo->i_lenAlloc; |
| 2082 | } else { |
| 2083 | if (!epos->offset) |
| 2084 | epos->offset = sizeof(struct allocExtDesc); |
| 2085 | ptr = epos->bh->b_data + epos->offset; |
| 2086 | alen = sizeof(struct allocExtDesc) + |
| 2087 | le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)-> |
| 2088 | lengthAllocDescs); |
| 2089 | } |
| 2090 | |
| 2091 | switch (iinfo->i_alloc_type) { |
| 2092 | case ICBTAG_FLAG_AD_SHORT: |
| 2093 | sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc); |
| 2094 | if (!sad) |
| 2095 | return -1; |
| 2096 | etype = le32_to_cpu(sad->extLength) >> 30; |
| 2097 | eloc->logicalBlockNum = le32_to_cpu(sad->extPosition); |
| 2098 | eloc->partitionReferenceNum = |
| 2099 | iinfo->i_location.partitionReferenceNum; |
| 2100 | *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK; |
| 2101 | break; |
| 2102 | case ICBTAG_FLAG_AD_LONG: |
| 2103 | lad = udf_get_filelongad(ptr, alen, &epos->offset, inc); |
| 2104 | if (!lad) |
| 2105 | return -1; |
| 2106 | etype = le32_to_cpu(lad->extLength) >> 30; |
| 2107 | *eloc = lelb_to_cpu(lad->extLocation); |
| 2108 | *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK; |
| 2109 | break; |
| 2110 | default: |
| 2111 | udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type); |
| 2112 | return -1; |
| 2113 | } |
| 2114 | |
| 2115 | return etype; |
| 2116 | } |
| 2117 | |
| 2118 | static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos, |
| 2119 | struct kernel_lb_addr neloc, uint32_t nelen) |
| 2120 | { |
| 2121 | struct kernel_lb_addr oeloc; |
| 2122 | uint32_t oelen; |
| 2123 | int8_t etype; |
| 2124 | |
| 2125 | if (epos.bh) |
| 2126 | get_bh(epos.bh); |
| 2127 | |
| 2128 | while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) { |
| 2129 | udf_write_aext(inode, &epos, &neloc, nelen, 1); |
| 2130 | neloc = oeloc; |
| 2131 | nelen = (etype << 30) | oelen; |
| 2132 | } |
| 2133 | udf_add_aext(inode, &epos, &neloc, nelen, 1); |
| 2134 | brelse(epos.bh); |
| 2135 | |
| 2136 | return (nelen >> 30); |
| 2137 | } |
| 2138 | |
| 2139 | int8_t udf_delete_aext(struct inode *inode, struct extent_position epos, |
| 2140 | struct kernel_lb_addr eloc, uint32_t elen) |
| 2141 | { |
| 2142 | struct extent_position oepos; |
| 2143 | int adsize; |
| 2144 | int8_t etype; |
| 2145 | struct allocExtDesc *aed; |
| 2146 | struct udf_inode_info *iinfo; |
| 2147 | |
| 2148 | if (epos.bh) { |
| 2149 | get_bh(epos.bh); |
| 2150 | get_bh(epos.bh); |
| 2151 | } |
| 2152 | |
| 2153 | iinfo = UDF_I(inode); |
| 2154 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
| 2155 | adsize = sizeof(struct short_ad); |
| 2156 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
| 2157 | adsize = sizeof(struct long_ad); |
| 2158 | else |
| 2159 | adsize = 0; |
| 2160 | |
| 2161 | oepos = epos; |
| 2162 | if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1) |
| 2163 | return -1; |
| 2164 | |
| 2165 | while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) { |
| 2166 | udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1); |
| 2167 | if (oepos.bh != epos.bh) { |
| 2168 | oepos.block = epos.block; |
| 2169 | brelse(oepos.bh); |
| 2170 | get_bh(epos.bh); |
| 2171 | oepos.bh = epos.bh; |
| 2172 | oepos.offset = epos.offset - adsize; |
| 2173 | } |
| 2174 | } |
| 2175 | memset(&eloc, 0x00, sizeof(struct kernel_lb_addr)); |
| 2176 | elen = 0; |
| 2177 | |
| 2178 | if (epos.bh != oepos.bh) { |
| 2179 | udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1); |
| 2180 | udf_write_aext(inode, &oepos, &eloc, elen, 1); |
| 2181 | udf_write_aext(inode, &oepos, &eloc, elen, 1); |
| 2182 | if (!oepos.bh) { |
| 2183 | iinfo->i_lenAlloc -= (adsize * 2); |
| 2184 | mark_inode_dirty(inode); |
| 2185 | } else { |
| 2186 | aed = (struct allocExtDesc *)oepos.bh->b_data; |
| 2187 | le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize)); |
| 2188 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || |
| 2189 | UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) |
| 2190 | udf_update_tag(oepos.bh->b_data, |
| 2191 | oepos.offset - (2 * adsize)); |
| 2192 | else |
| 2193 | udf_update_tag(oepos.bh->b_data, |
| 2194 | sizeof(struct allocExtDesc)); |
| 2195 | mark_buffer_dirty_inode(oepos.bh, inode); |
| 2196 | } |
| 2197 | } else { |
| 2198 | udf_write_aext(inode, &oepos, &eloc, elen, 1); |
| 2199 | if (!oepos.bh) { |
| 2200 | iinfo->i_lenAlloc -= adsize; |
| 2201 | mark_inode_dirty(inode); |
| 2202 | } else { |
| 2203 | aed = (struct allocExtDesc *)oepos.bh->b_data; |
| 2204 | le32_add_cpu(&aed->lengthAllocDescs, -adsize); |
| 2205 | if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || |
| 2206 | UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) |
| 2207 | udf_update_tag(oepos.bh->b_data, |
| 2208 | epos.offset - adsize); |
| 2209 | else |
| 2210 | udf_update_tag(oepos.bh->b_data, |
| 2211 | sizeof(struct allocExtDesc)); |
| 2212 | mark_buffer_dirty_inode(oepos.bh, inode); |
| 2213 | } |
| 2214 | } |
| 2215 | |
| 2216 | brelse(epos.bh); |
| 2217 | brelse(oepos.bh); |
| 2218 | |
| 2219 | return (elen >> 30); |
| 2220 | } |
| 2221 | |
| 2222 | int8_t inode_bmap(struct inode *inode, sector_t block, |
| 2223 | struct extent_position *pos, struct kernel_lb_addr *eloc, |
| 2224 | uint32_t *elen, sector_t *offset) |
| 2225 | { |
| 2226 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
| 2227 | loff_t lbcount = 0, bcount = |
| 2228 | (loff_t) block << blocksize_bits; |
| 2229 | int8_t etype; |
| 2230 | struct udf_inode_info *iinfo; |
| 2231 | |
| 2232 | iinfo = UDF_I(inode); |
| 2233 | if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) { |
| 2234 | pos->offset = 0; |
| 2235 | pos->block = iinfo->i_location; |
| 2236 | pos->bh = NULL; |
| 2237 | } |
| 2238 | *elen = 0; |
| 2239 | do { |
| 2240 | etype = udf_next_aext(inode, pos, eloc, elen, 1); |
| 2241 | if (etype == -1) { |
| 2242 | *offset = (bcount - lbcount) >> blocksize_bits; |
| 2243 | iinfo->i_lenExtents = lbcount; |
| 2244 | return -1; |
| 2245 | } |
| 2246 | lbcount += *elen; |
| 2247 | } while (lbcount <= bcount); |
| 2248 | /* update extent cache */ |
| 2249 | udf_update_extent_cache(inode, lbcount - *elen, pos, 1); |
| 2250 | *offset = (bcount + *elen - lbcount) >> blocksize_bits; |
| 2251 | |
| 2252 | return etype; |
| 2253 | } |
| 2254 | |
| 2255 | long udf_block_map(struct inode *inode, sector_t block) |
| 2256 | { |
| 2257 | struct kernel_lb_addr eloc; |
| 2258 | uint32_t elen; |
| 2259 | sector_t offset; |
| 2260 | struct extent_position epos = {}; |
| 2261 | int ret; |
| 2262 | |
| 2263 | down_read(&UDF_I(inode)->i_data_sem); |
| 2264 | |
| 2265 | if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == |
| 2266 | (EXT_RECORDED_ALLOCATED >> 30)) |
| 2267 | ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset); |
| 2268 | else |
| 2269 | ret = 0; |
| 2270 | |
| 2271 | up_read(&UDF_I(inode)->i_data_sem); |
| 2272 | brelse(epos.bh); |
| 2273 | |
| 2274 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV)) |
| 2275 | return udf_fixed_to_variable(ret); |
| 2276 | else |
| 2277 | return ret; |
| 2278 | } |