| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/buffer_head.h> |
| 8 | #include <linux/mpage.h> |
| 9 | #include <linux/bio.h> |
| 10 | #include <linux/blkdev.h> |
| 11 | #include <linux/time.h> |
| 12 | #include <linux/writeback.h> |
| 13 | #include <linux/uio.h> |
| 14 | #include <linux/random.h> |
| 15 | #include <linux/iversion.h> |
| 16 | |
| 17 | #include "exfat_raw.h" |
| 18 | #include "exfat_fs.h" |
| 19 | |
| 20 | int __exfat_write_inode(struct inode *inode, int sync) |
| 21 | { |
| 22 | unsigned long long on_disk_size; |
| 23 | struct exfat_dentry *ep, *ep2; |
| 24 | struct exfat_entry_set_cache es; |
| 25 | struct super_block *sb = inode->i_sb; |
| 26 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
| 27 | struct exfat_inode_info *ei = EXFAT_I(inode); |
| 28 | bool is_dir = (ei->type == TYPE_DIR) ? true : false; |
| 29 | |
| 30 | if (inode->i_ino == EXFAT_ROOT_INO) |
| 31 | return 0; |
| 32 | |
| 33 | /* |
| 34 | * If the inode is already unlinked, there is no need for updating it. |
| 35 | */ |
| 36 | if (ei->dir.dir == DIR_DELETED) |
| 37 | return 0; |
| 38 | |
| 39 | if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1) |
| 40 | return 0; |
| 41 | |
| 42 | exfat_set_volume_dirty(sb); |
| 43 | |
| 44 | /* get the directory entry of given file or directory */ |
| 45 | if (exfat_get_dentry_set(&es, sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES)) |
| 46 | return -EIO; |
| 47 | ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); |
| 48 | ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); |
| 49 | |
| 50 | ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode)); |
| 51 | |
| 52 | /* set FILE_INFO structure using the acquired struct exfat_dentry */ |
| 53 | exfat_set_entry_time(sbi, &ei->i_crtime, |
| 54 | &ep->dentry.file.create_tz, |
| 55 | &ep->dentry.file.create_time, |
| 56 | &ep->dentry.file.create_date, |
| 57 | &ep->dentry.file.create_time_cs); |
| 58 | exfat_set_entry_time(sbi, &inode->i_mtime, |
| 59 | &ep->dentry.file.modify_tz, |
| 60 | &ep->dentry.file.modify_time, |
| 61 | &ep->dentry.file.modify_date, |
| 62 | &ep->dentry.file.modify_time_cs); |
| 63 | exfat_set_entry_time(sbi, &inode->i_atime, |
| 64 | &ep->dentry.file.access_tz, |
| 65 | &ep->dentry.file.access_time, |
| 66 | &ep->dentry.file.access_date, |
| 67 | NULL); |
| 68 | |
| 69 | /* File size should be zero if there is no cluster allocated */ |
| 70 | on_disk_size = i_size_read(inode); |
| 71 | |
| 72 | if (ei->start_clu == EXFAT_EOF_CLUSTER) |
| 73 | on_disk_size = 0; |
| 74 | |
| 75 | ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size); |
| 76 | ep2->dentry.stream.size = ep2->dentry.stream.valid_size; |
| 77 | if (on_disk_size) { |
| 78 | ep2->dentry.stream.flags = ei->flags; |
| 79 | ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu); |
| 80 | } else { |
| 81 | ep2->dentry.stream.flags = ALLOC_FAT_CHAIN; |
| 82 | ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER; |
| 83 | } |
| 84 | |
| 85 | exfat_update_dir_chksum_with_entry_set(&es); |
| 86 | return exfat_put_dentry_set(&es, sync); |
| 87 | } |
| 88 | |
| 89 | int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 90 | { |
| 91 | int ret; |
| 92 | |
| 93 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); |
| 94 | ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| 95 | mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); |
| 96 | |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | void exfat_sync_inode(struct inode *inode) |
| 101 | { |
| 102 | lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock); |
| 103 | __exfat_write_inode(inode, 1); |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Input: inode, (logical) clu_offset, target allocation area |
| 108 | * Output: errcode, cluster number |
| 109 | * *clu = (~0), if it's unable to allocate a new cluster |
| 110 | */ |
| 111 | static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset, |
| 112 | unsigned int *clu, int create) |
| 113 | { |
| 114 | int ret; |
| 115 | unsigned int last_clu; |
| 116 | struct exfat_chain new_clu; |
| 117 | struct super_block *sb = inode->i_sb; |
| 118 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
| 119 | struct exfat_inode_info *ei = EXFAT_I(inode); |
| 120 | unsigned int local_clu_offset = clu_offset; |
| 121 | unsigned int num_to_be_allocated = 0, num_clusters = 0; |
| 122 | |
| 123 | if (ei->i_size_ondisk > 0) |
| 124 | num_clusters = |
| 125 | EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi); |
| 126 | |
| 127 | if (clu_offset >= num_clusters) |
| 128 | num_to_be_allocated = clu_offset - num_clusters + 1; |
| 129 | |
| 130 | if (!create && (num_to_be_allocated > 0)) { |
| 131 | *clu = EXFAT_EOF_CLUSTER; |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | *clu = last_clu = ei->start_clu; |
| 136 | |
| 137 | if (ei->flags == ALLOC_NO_FAT_CHAIN) { |
| 138 | if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { |
| 139 | last_clu += clu_offset - 1; |
| 140 | |
| 141 | if (clu_offset == num_clusters) |
| 142 | *clu = EXFAT_EOF_CLUSTER; |
| 143 | else |
| 144 | *clu += clu_offset; |
| 145 | } |
| 146 | } else if (ei->type == TYPE_FILE) { |
| 147 | unsigned int fclus = 0; |
| 148 | int err = exfat_get_cluster(inode, clu_offset, |
| 149 | &fclus, clu, &last_clu, 1); |
| 150 | if (err) |
| 151 | return -EIO; |
| 152 | |
| 153 | clu_offset -= fclus; |
| 154 | } else { |
| 155 | /* hint information */ |
| 156 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && |
| 157 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { |
| 158 | clu_offset -= ei->hint_bmap.off; |
| 159 | /* hint_bmap.clu should be valid */ |
| 160 | WARN_ON(ei->hint_bmap.clu < 2); |
| 161 | *clu = ei->hint_bmap.clu; |
| 162 | } |
| 163 | |
| 164 | while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { |
| 165 | last_clu = *clu; |
| 166 | if (exfat_get_next_cluster(sb, clu)) |
| 167 | return -EIO; |
| 168 | clu_offset--; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | if (*clu == EXFAT_EOF_CLUSTER) { |
| 173 | exfat_set_volume_dirty(sb); |
| 174 | |
| 175 | new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ? |
| 176 | EXFAT_EOF_CLUSTER : last_clu + 1; |
| 177 | new_clu.size = 0; |
| 178 | new_clu.flags = ei->flags; |
| 179 | |
| 180 | /* allocate a cluster */ |
| 181 | if (num_to_be_allocated < 1) { |
| 182 | /* Broken FAT (i_sze > allocated FAT) */ |
| 183 | exfat_fs_error(sb, "broken FAT chain."); |
| 184 | return -EIO; |
| 185 | } |
| 186 | |
| 187 | ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu, |
| 188 | inode_needs_sync(inode)); |
| 189 | if (ret) |
| 190 | return ret; |
| 191 | |
| 192 | if (new_clu.dir == EXFAT_EOF_CLUSTER || |
| 193 | new_clu.dir == EXFAT_FREE_CLUSTER) { |
| 194 | exfat_fs_error(sb, |
| 195 | "bogus cluster new allocated (last_clu : %u, new_clu : %u)", |
| 196 | last_clu, new_clu.dir); |
| 197 | return -EIO; |
| 198 | } |
| 199 | |
| 200 | /* append to the FAT chain */ |
| 201 | if (last_clu == EXFAT_EOF_CLUSTER) { |
| 202 | if (new_clu.flags == ALLOC_FAT_CHAIN) |
| 203 | ei->flags = ALLOC_FAT_CHAIN; |
| 204 | ei->start_clu = new_clu.dir; |
| 205 | } else { |
| 206 | if (new_clu.flags != ei->flags) { |
| 207 | /* no-fat-chain bit is disabled, |
| 208 | * so fat-chain should be synced with |
| 209 | * alloc-bitmap |
| 210 | */ |
| 211 | exfat_chain_cont_cluster(sb, ei->start_clu, |
| 212 | num_clusters); |
| 213 | ei->flags = ALLOC_FAT_CHAIN; |
| 214 | } |
| 215 | if (new_clu.flags == ALLOC_FAT_CHAIN) |
| 216 | if (exfat_ent_set(sb, last_clu, new_clu.dir)) |
| 217 | return -EIO; |
| 218 | } |
| 219 | |
| 220 | num_clusters += num_to_be_allocated; |
| 221 | *clu = new_clu.dir; |
| 222 | |
| 223 | inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9; |
| 224 | |
| 225 | /* |
| 226 | * Move *clu pointer along FAT chains (hole care) because the |
| 227 | * caller of this function expect *clu to be the last cluster. |
| 228 | * This only works when num_to_be_allocated >= 2, |
| 229 | * *clu = (the first cluster of the allocated chain) => |
| 230 | * (the last cluster of ...) |
| 231 | */ |
| 232 | if (ei->flags == ALLOC_NO_FAT_CHAIN) { |
| 233 | *clu += num_to_be_allocated - 1; |
| 234 | } else { |
| 235 | while (num_to_be_allocated > 1) { |
| 236 | if (exfat_get_next_cluster(sb, clu)) |
| 237 | return -EIO; |
| 238 | num_to_be_allocated--; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | } |
| 243 | |
| 244 | /* hint information */ |
| 245 | ei->hint_bmap.off = local_clu_offset; |
| 246 | ei->hint_bmap.clu = *clu; |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static int exfat_map_new_buffer(struct exfat_inode_info *ei, |
| 252 | struct buffer_head *bh, loff_t pos) |
| 253 | { |
| 254 | if (buffer_delay(bh) && pos > ei->i_size_aligned) |
| 255 | return -EIO; |
| 256 | set_buffer_new(bh); |
| 257 | |
| 258 | /* |
| 259 | * Adjust i_size_aligned if i_size_ondisk is bigger than it. |
| 260 | */ |
| 261 | if (ei->i_size_ondisk > ei->i_size_aligned) |
| 262 | ei->i_size_aligned = ei->i_size_ondisk; |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int exfat_get_block(struct inode *inode, sector_t iblock, |
| 267 | struct buffer_head *bh_result, int create) |
| 268 | { |
| 269 | struct exfat_inode_info *ei = EXFAT_I(inode); |
| 270 | struct super_block *sb = inode->i_sb; |
| 271 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
| 272 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 273 | int err = 0; |
| 274 | unsigned long mapped_blocks = 0; |
| 275 | unsigned int cluster, sec_offset; |
| 276 | sector_t last_block; |
| 277 | sector_t phys = 0; |
| 278 | loff_t pos; |
| 279 | |
| 280 | mutex_lock(&sbi->s_lock); |
| 281 | last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb); |
| 282 | if (iblock >= last_block && !create) |
| 283 | goto done; |
| 284 | |
| 285 | /* Is this block already allocated? */ |
| 286 | err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits, |
| 287 | &cluster, create); |
| 288 | if (err) { |
| 289 | if (err != -ENOSPC) |
| 290 | exfat_fs_error_ratelimit(sb, |
| 291 | "failed to bmap (inode : %p iblock : %llu, err : %d)", |
| 292 | inode, (unsigned long long)iblock, err); |
| 293 | goto unlock_ret; |
| 294 | } |
| 295 | |
| 296 | if (cluster == EXFAT_EOF_CLUSTER) |
| 297 | goto done; |
| 298 | |
| 299 | /* sector offset in cluster */ |
| 300 | sec_offset = iblock & (sbi->sect_per_clus - 1); |
| 301 | |
| 302 | phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset; |
| 303 | mapped_blocks = sbi->sect_per_clus - sec_offset; |
| 304 | max_blocks = min(mapped_blocks, max_blocks); |
| 305 | |
| 306 | /* Treat newly added block / cluster */ |
| 307 | if (iblock < last_block) |
| 308 | create = 0; |
| 309 | |
| 310 | if (create || buffer_delay(bh_result)) { |
| 311 | pos = EXFAT_BLK_TO_B((iblock + 1), sb); |
| 312 | if (ei->i_size_ondisk < pos) |
| 313 | ei->i_size_ondisk = pos; |
| 314 | } |
| 315 | |
| 316 | if (create) { |
| 317 | err = exfat_map_new_buffer(ei, bh_result, pos); |
| 318 | if (err) { |
| 319 | exfat_fs_error(sb, |
| 320 | "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n", |
| 321 | pos, ei->i_size_aligned); |
| 322 | goto unlock_ret; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | if (buffer_delay(bh_result)) |
| 327 | clear_buffer_delay(bh_result); |
| 328 | map_bh(bh_result, sb, phys); |
| 329 | done: |
| 330 | bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb); |
| 331 | unlock_ret: |
| 332 | mutex_unlock(&sbi->s_lock); |
| 333 | return err; |
| 334 | } |
| 335 | |
| 336 | static int exfat_read_folio(struct file *file, struct folio *folio) |
| 337 | { |
| 338 | return mpage_read_folio(folio, exfat_get_block); |
| 339 | } |
| 340 | |
| 341 | static void exfat_readahead(struct readahead_control *rac) |
| 342 | { |
| 343 | mpage_readahead(rac, exfat_get_block); |
| 344 | } |
| 345 | |
| 346 | static int exfat_writepages(struct address_space *mapping, |
| 347 | struct writeback_control *wbc) |
| 348 | { |
| 349 | return mpage_writepages(mapping, wbc, exfat_get_block); |
| 350 | } |
| 351 | |
| 352 | static void exfat_write_failed(struct address_space *mapping, loff_t to) |
| 353 | { |
| 354 | struct inode *inode = mapping->host; |
| 355 | |
| 356 | if (to > i_size_read(inode)) { |
| 357 | truncate_pagecache(inode, i_size_read(inode)); |
| 358 | inode->i_mtime = inode->i_ctime = current_time(inode); |
| 359 | exfat_truncate(inode); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | static int exfat_write_begin(struct file *file, struct address_space *mapping, |
| 364 | loff_t pos, unsigned int len, |
| 365 | struct page **pagep, void **fsdata) |
| 366 | { |
| 367 | int ret; |
| 368 | |
| 369 | *pagep = NULL; |
| 370 | ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata, |
| 371 | exfat_get_block, |
| 372 | &EXFAT_I(mapping->host)->i_size_ondisk); |
| 373 | |
| 374 | if (ret < 0) |
| 375 | exfat_write_failed(mapping, pos+len); |
| 376 | |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | static int exfat_write_end(struct file *file, struct address_space *mapping, |
| 381 | loff_t pos, unsigned int len, unsigned int copied, |
| 382 | struct page *pagep, void *fsdata) |
| 383 | { |
| 384 | struct inode *inode = mapping->host; |
| 385 | struct exfat_inode_info *ei = EXFAT_I(inode); |
| 386 | int err; |
| 387 | |
| 388 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); |
| 389 | |
| 390 | if (ei->i_size_aligned < i_size_read(inode)) { |
| 391 | exfat_fs_error(inode->i_sb, |
| 392 | "invalid size(size(%llu) > aligned(%llu)\n", |
| 393 | i_size_read(inode), ei->i_size_aligned); |
| 394 | return -EIO; |
| 395 | } |
| 396 | |
| 397 | if (err < len) |
| 398 | exfat_write_failed(mapping, pos+len); |
| 399 | |
| 400 | if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) { |
| 401 | inode->i_mtime = inode->i_ctime = current_time(inode); |
| 402 | ei->attr |= ATTR_ARCHIVE; |
| 403 | mark_inode_dirty(inode); |
| 404 | } |
| 405 | |
| 406 | return err; |
| 407 | } |
| 408 | |
| 409 | static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
| 410 | { |
| 411 | struct address_space *mapping = iocb->ki_filp->f_mapping; |
| 412 | struct inode *inode = mapping->host; |
| 413 | loff_t size = iocb->ki_pos + iov_iter_count(iter); |
| 414 | int rw = iov_iter_rw(iter); |
| 415 | ssize_t ret; |
| 416 | |
| 417 | if (rw == WRITE) { |
| 418 | /* |
| 419 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
| 420 | * so we need to update the ->i_size_aligned to block boundary. |
| 421 | * |
| 422 | * But we must fill the remaining area or hole by nul for |
| 423 | * updating ->i_size_aligned |
| 424 | * |
| 425 | * Return 0, and fallback to normal buffered write. |
| 426 | */ |
| 427 | if (EXFAT_I(inode)->i_size_aligned < size) |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * Need to use the DIO_LOCKING for avoiding the race |
| 433 | * condition of exfat_get_block() and ->truncate(). |
| 434 | */ |
| 435 | ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block); |
| 436 | if (ret < 0 && (rw & WRITE)) |
| 437 | exfat_write_failed(mapping, size); |
| 438 | return ret; |
| 439 | } |
| 440 | |
| 441 | static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block) |
| 442 | { |
| 443 | sector_t blocknr; |
| 444 | |
| 445 | /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ |
| 446 | down_read(&EXFAT_I(mapping->host)->truncate_lock); |
| 447 | blocknr = generic_block_bmap(mapping, block, exfat_get_block); |
| 448 | up_read(&EXFAT_I(mapping->host)->truncate_lock); |
| 449 | return blocknr; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * exfat_block_truncate_page() zeroes out a mapping from file offset `from' |
| 454 | * up to the end of the block which corresponds to `from'. |
| 455 | * This is required during truncate to physically zeroout the tail end |
| 456 | * of that block so it doesn't yield old data if the file is later grown. |
| 457 | * Also, avoid causing failure from fsx for cases of "data past EOF" |
| 458 | */ |
| 459 | int exfat_block_truncate_page(struct inode *inode, loff_t from) |
| 460 | { |
| 461 | return block_truncate_page(inode->i_mapping, from, exfat_get_block); |
| 462 | } |
| 463 | |
| 464 | static const struct address_space_operations exfat_aops = { |
| 465 | .dirty_folio = block_dirty_folio, |
| 466 | .invalidate_folio = block_invalidate_folio, |
| 467 | .read_folio = exfat_read_folio, |
| 468 | .readahead = exfat_readahead, |
| 469 | .writepages = exfat_writepages, |
| 470 | .write_begin = exfat_write_begin, |
| 471 | .write_end = exfat_write_end, |
| 472 | .direct_IO = exfat_direct_IO, |
| 473 | .bmap = exfat_aop_bmap, |
| 474 | .migrate_folio = buffer_migrate_folio, |
| 475 | }; |
| 476 | |
| 477 | static inline unsigned long exfat_hash(loff_t i_pos) |
| 478 | { |
| 479 | return hash_32(i_pos, EXFAT_HASH_BITS); |
| 480 | } |
| 481 | |
| 482 | void exfat_hash_inode(struct inode *inode, loff_t i_pos) |
| 483 | { |
| 484 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
| 485 | struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); |
| 486 | |
| 487 | spin_lock(&sbi->inode_hash_lock); |
| 488 | EXFAT_I(inode)->i_pos = i_pos; |
| 489 | hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); |
| 490 | spin_unlock(&sbi->inode_hash_lock); |
| 491 | } |
| 492 | |
| 493 | void exfat_unhash_inode(struct inode *inode) |
| 494 | { |
| 495 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
| 496 | |
| 497 | spin_lock(&sbi->inode_hash_lock); |
| 498 | hlist_del_init(&EXFAT_I(inode)->i_hash_fat); |
| 499 | EXFAT_I(inode)->i_pos = 0; |
| 500 | spin_unlock(&sbi->inode_hash_lock); |
| 501 | } |
| 502 | |
| 503 | struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) |
| 504 | { |
| 505 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
| 506 | struct exfat_inode_info *info; |
| 507 | struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); |
| 508 | struct inode *inode = NULL; |
| 509 | |
| 510 | spin_lock(&sbi->inode_hash_lock); |
| 511 | hlist_for_each_entry(info, head, i_hash_fat) { |
| 512 | WARN_ON(info->vfs_inode.i_sb != sb); |
| 513 | |
| 514 | if (i_pos != info->i_pos) |
| 515 | continue; |
| 516 | inode = igrab(&info->vfs_inode); |
| 517 | if (inode) |
| 518 | break; |
| 519 | } |
| 520 | spin_unlock(&sbi->inode_hash_lock); |
| 521 | return inode; |
| 522 | } |
| 523 | |
| 524 | /* doesn't deal with root inode */ |
| 525 | static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info) |
| 526 | { |
| 527 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
| 528 | struct exfat_inode_info *ei = EXFAT_I(inode); |
| 529 | loff_t size = info->size; |
| 530 | |
| 531 | ei->dir = info->dir; |
| 532 | ei->entry = info->entry; |
| 533 | ei->attr = info->attr; |
| 534 | ei->start_clu = info->start_clu; |
| 535 | ei->flags = info->flags; |
| 536 | ei->type = info->type; |
| 537 | |
| 538 | ei->version = 0; |
| 539 | ei->hint_stat.eidx = 0; |
| 540 | ei->hint_stat.clu = info->start_clu; |
| 541 | ei->hint_femp.eidx = EXFAT_HINT_NONE; |
| 542 | ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
| 543 | ei->i_pos = 0; |
| 544 | |
| 545 | inode->i_uid = sbi->options.fs_uid; |
| 546 | inode->i_gid = sbi->options.fs_gid; |
| 547 | inode_inc_iversion(inode); |
| 548 | inode->i_generation = get_random_u32(); |
| 549 | |
| 550 | if (info->attr & ATTR_SUBDIR) { /* directory */ |
| 551 | inode->i_generation &= ~1; |
| 552 | inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); |
| 553 | inode->i_op = &exfat_dir_inode_operations; |
| 554 | inode->i_fop = &exfat_dir_operations; |
| 555 | set_nlink(inode, info->num_subdirs); |
| 556 | } else { /* regular file */ |
| 557 | inode->i_generation |= 1; |
| 558 | inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); |
| 559 | inode->i_op = &exfat_file_inode_operations; |
| 560 | inode->i_fop = &exfat_file_operations; |
| 561 | inode->i_mapping->a_ops = &exfat_aops; |
| 562 | inode->i_mapping->nrpages = 0; |
| 563 | } |
| 564 | |
| 565 | i_size_write(inode, size); |
| 566 | |
| 567 | /* ondisk and aligned size should be aligned with block size */ |
| 568 | if (size & (inode->i_sb->s_blocksize - 1)) { |
| 569 | size |= (inode->i_sb->s_blocksize - 1); |
| 570 | size++; |
| 571 | } |
| 572 | |
| 573 | ei->i_size_aligned = size; |
| 574 | ei->i_size_ondisk = size; |
| 575 | |
| 576 | exfat_save_attr(inode, info->attr); |
| 577 | |
| 578 | inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9; |
| 579 | inode->i_mtime = info->mtime; |
| 580 | inode->i_ctime = info->mtime; |
| 581 | ei->i_crtime = info->crtime; |
| 582 | inode->i_atime = info->atime; |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | struct inode *exfat_build_inode(struct super_block *sb, |
| 588 | struct exfat_dir_entry *info, loff_t i_pos) |
| 589 | { |
| 590 | struct inode *inode; |
| 591 | int err; |
| 592 | |
| 593 | inode = exfat_iget(sb, i_pos); |
| 594 | if (inode) |
| 595 | goto out; |
| 596 | inode = new_inode(sb); |
| 597 | if (!inode) { |
| 598 | inode = ERR_PTR(-ENOMEM); |
| 599 | goto out; |
| 600 | } |
| 601 | inode->i_ino = iunique(sb, EXFAT_ROOT_INO); |
| 602 | inode_set_iversion(inode, 1); |
| 603 | err = exfat_fill_inode(inode, info); |
| 604 | if (err) { |
| 605 | iput(inode); |
| 606 | inode = ERR_PTR(err); |
| 607 | goto out; |
| 608 | } |
| 609 | exfat_hash_inode(inode, i_pos); |
| 610 | insert_inode_hash(inode); |
| 611 | out: |
| 612 | return inode; |
| 613 | } |
| 614 | |
| 615 | void exfat_evict_inode(struct inode *inode) |
| 616 | { |
| 617 | truncate_inode_pages(&inode->i_data, 0); |
| 618 | |
| 619 | if (!inode->i_nlink) { |
| 620 | i_size_write(inode, 0); |
| 621 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); |
| 622 | __exfat_truncate(inode); |
| 623 | mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); |
| 624 | } |
| 625 | |
| 626 | invalidate_inode_buffers(inode); |
| 627 | clear_inode(inode); |
| 628 | exfat_cache_inval_inode(inode); |
| 629 | exfat_unhash_inode(inode); |
| 630 | } |