1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6 #include <linux/fs_context.h> 7 #include <linux/fs_parser.h> 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/time.h> 11 #include <linux/mount.h> 12 #include <linux/cred.h> 13 #include <linux/statfs.h> 14 #include <linux/seq_file.h> 15 #include <linux/blkdev.h> 16 #include <linux/fs_struct.h> 17 #include <linux/iversion.h> 18 #include <linux/nls.h> 19 #include <linux/buffer_head.h> 20 21 #include "exfat_raw.h" 22 #include "exfat_fs.h" 23 24 static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; 25 static struct kmem_cache *exfat_inode_cachep; 26 27 static void exfat_free_iocharset(struct exfat_sb_info *sbi) 28 { 29 if (sbi->options.iocharset != exfat_default_iocharset) 30 kfree(sbi->options.iocharset); 31 } 32 33 static void exfat_delayed_free(struct rcu_head *p) 34 { 35 struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); 36 37 unload_nls(sbi->nls_io); 38 exfat_free_iocharset(sbi); 39 exfat_free_upcase_table(sbi); 40 kfree(sbi); 41 } 42 43 static void exfat_put_super(struct super_block *sb) 44 { 45 struct exfat_sb_info *sbi = EXFAT_SB(sb); 46 47 mutex_lock(&sbi->s_lock); 48 if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state)) 49 sync_blockdev(sb->s_bdev); 50 exfat_set_vol_flags(sb, VOL_CLEAN); 51 exfat_free_bitmap(sbi); 52 brelse(sbi->pbr_bh); 53 mutex_unlock(&sbi->s_lock); 54 55 call_rcu(&sbi->rcu, exfat_delayed_free); 56 } 57 58 static int exfat_sync_fs(struct super_block *sb, int wait) 59 { 60 struct exfat_sb_info *sbi = EXFAT_SB(sb); 61 int err = 0; 62 63 /* If there are some dirty buffers in the bdev inode */ 64 mutex_lock(&sbi->s_lock); 65 if (test_and_clear_bit(EXFAT_SB_DIRTY, &sbi->s_state)) { 66 sync_blockdev(sb->s_bdev); 67 if (exfat_set_vol_flags(sb, VOL_CLEAN)) 68 err = -EIO; 69 } 70 mutex_unlock(&sbi->s_lock); 71 return err; 72 } 73 74 static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) 75 { 76 struct super_block *sb = dentry->d_sb; 77 struct exfat_sb_info *sbi = EXFAT_SB(sb); 78 unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); 79 80 if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { 81 mutex_lock(&sbi->s_lock); 82 if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { 83 mutex_unlock(&sbi->s_lock); 84 return -EIO; 85 } 86 mutex_unlock(&sbi->s_lock); 87 } 88 89 buf->f_type = sb->s_magic; 90 buf->f_bsize = sbi->cluster_size; 91 buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ 92 buf->f_bfree = buf->f_blocks - sbi->used_clusters; 93 buf->f_bavail = buf->f_bfree; 94 buf->f_fsid.val[0] = (unsigned int)id; 95 buf->f_fsid.val[1] = (unsigned int)(id >> 32); 96 /* Unicode utf16 255 characters */ 97 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; 98 return 0; 99 } 100 101 int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag) 102 { 103 struct exfat_sb_info *sbi = EXFAT_SB(sb); 104 struct pbr64 *bpb = (struct pbr64 *)sbi->pbr_bh->b_data; 105 bool sync = 0; 106 107 /* flags are not changed */ 108 if (sbi->vol_flag == new_flag) 109 return 0; 110 111 sbi->vol_flag = new_flag; 112 113 /* skip updating volume dirty flag, 114 * if this volume has been mounted with read-only 115 */ 116 if (sb_rdonly(sb)) 117 return 0; 118 119 bpb->bsx.vol_flags = cpu_to_le16(new_flag); 120 121 if (new_flag == VOL_DIRTY && !buffer_dirty(sbi->pbr_bh)) 122 sync = true; 123 else 124 sync = false; 125 126 set_buffer_uptodate(sbi->pbr_bh); 127 mark_buffer_dirty(sbi->pbr_bh); 128 129 if (sync) 130 sync_dirty_buffer(sbi->pbr_bh); 131 return 0; 132 } 133 134 static int exfat_show_options(struct seq_file *m, struct dentry *root) 135 { 136 struct super_block *sb = root->d_sb; 137 struct exfat_sb_info *sbi = EXFAT_SB(sb); 138 struct exfat_mount_options *opts = &sbi->options; 139 140 /* Show partition info */ 141 if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) 142 seq_printf(m, ",uid=%u", 143 from_kuid_munged(&init_user_ns, opts->fs_uid)); 144 if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) 145 seq_printf(m, ",gid=%u", 146 from_kgid_munged(&init_user_ns, opts->fs_gid)); 147 seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); 148 if (opts->allow_utime) 149 seq_printf(m, ",allow_utime=%04o", opts->allow_utime); 150 if (opts->utf8) 151 seq_puts(m, ",iocharset=utf8"); 152 else if (sbi->nls_io) 153 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); 154 if (opts->errors == EXFAT_ERRORS_CONT) 155 seq_puts(m, ",errors=continue"); 156 else if (opts->errors == EXFAT_ERRORS_PANIC) 157 seq_puts(m, ",errors=panic"); 158 else 159 seq_puts(m, ",errors=remount-ro"); 160 if (opts->discard) 161 seq_puts(m, ",discard"); 162 if (opts->time_offset) 163 seq_printf(m, ",time_offset=%d", opts->time_offset); 164 return 0; 165 } 166 167 static struct inode *exfat_alloc_inode(struct super_block *sb) 168 { 169 struct exfat_inode_info *ei; 170 171 ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); 172 if (!ei) 173 return NULL; 174 175 init_rwsem(&ei->truncate_lock); 176 return &ei->vfs_inode; 177 } 178 179 static void exfat_free_inode(struct inode *inode) 180 { 181 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); 182 } 183 184 static const struct super_operations exfat_sops = { 185 .alloc_inode = exfat_alloc_inode, 186 .free_inode = exfat_free_inode, 187 .write_inode = exfat_write_inode, 188 .evict_inode = exfat_evict_inode, 189 .put_super = exfat_put_super, 190 .sync_fs = exfat_sync_fs, 191 .statfs = exfat_statfs, 192 .show_options = exfat_show_options, 193 }; 194 195 enum { 196 Opt_uid, 197 Opt_gid, 198 Opt_umask, 199 Opt_dmask, 200 Opt_fmask, 201 Opt_allow_utime, 202 Opt_charset, 203 Opt_errors, 204 Opt_discard, 205 Opt_time_offset, 206 }; 207 208 static const struct constant_table exfat_param_enums[] = { 209 { "continue", EXFAT_ERRORS_CONT }, 210 { "panic", EXFAT_ERRORS_PANIC }, 211 { "remount-ro", EXFAT_ERRORS_RO }, 212 {} 213 }; 214 215 static const struct fs_parameter_spec exfat_parameters[] = { 216 fsparam_u32("uid", Opt_uid), 217 fsparam_u32("gid", Opt_gid), 218 fsparam_u32oct("umask", Opt_umask), 219 fsparam_u32oct("dmask", Opt_dmask), 220 fsparam_u32oct("fmask", Opt_fmask), 221 fsparam_u32oct("allow_utime", Opt_allow_utime), 222 fsparam_string("iocharset", Opt_charset), 223 fsparam_enum("errors", Opt_errors, exfat_param_enums), 224 fsparam_flag("discard", Opt_discard), 225 fsparam_s32("time_offset", Opt_time_offset), 226 {} 227 }; 228 229 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) 230 { 231 struct exfat_sb_info *sbi = fc->s_fs_info; 232 struct exfat_mount_options *opts = &sbi->options; 233 struct fs_parse_result result; 234 int opt; 235 236 opt = fs_parse(fc, exfat_parameters, param, &result); 237 if (opt < 0) 238 return opt; 239 240 switch (opt) { 241 case Opt_uid: 242 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 243 break; 244 case Opt_gid: 245 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 246 break; 247 case Opt_umask: 248 opts->fs_fmask = result.uint_32; 249 opts->fs_dmask = result.uint_32; 250 break; 251 case Opt_dmask: 252 opts->fs_dmask = result.uint_32; 253 break; 254 case Opt_fmask: 255 opts->fs_fmask = result.uint_32; 256 break; 257 case Opt_allow_utime: 258 opts->allow_utime = result.uint_32 & 0022; 259 break; 260 case Opt_charset: 261 exfat_free_iocharset(sbi); 262 opts->iocharset = kstrdup(param->string, GFP_KERNEL); 263 if (!opts->iocharset) 264 return -ENOMEM; 265 break; 266 case Opt_errors: 267 opts->errors = result.uint_32; 268 break; 269 case Opt_discard: 270 opts->discard = 1; 271 break; 272 case Opt_time_offset: 273 /* 274 * Make the limit 24 just in case someone invents something 275 * unusual. 276 */ 277 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) 278 return -EINVAL; 279 opts->time_offset = result.int_32; 280 break; 281 default: 282 return -EINVAL; 283 } 284 285 return 0; 286 } 287 288 static void exfat_hash_init(struct super_block *sb) 289 { 290 struct exfat_sb_info *sbi = EXFAT_SB(sb); 291 int i; 292 293 spin_lock_init(&sbi->inode_hash_lock); 294 for (i = 0; i < EXFAT_HASH_SIZE; i++) 295 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 296 } 297 298 static int exfat_read_root(struct inode *inode) 299 { 300 struct super_block *sb = inode->i_sb; 301 struct exfat_sb_info *sbi = EXFAT_SB(sb); 302 struct exfat_inode_info *ei = EXFAT_I(inode); 303 struct exfat_chain cdir; 304 int num_subdirs, num_clu = 0; 305 306 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 307 ei->entry = -1; 308 ei->start_clu = sbi->root_dir; 309 ei->flags = ALLOC_FAT_CHAIN; 310 ei->type = TYPE_DIR; 311 ei->version = 0; 312 ei->rwoffset = 0; 313 ei->hint_bmap.off = EXFAT_EOF_CLUSTER; 314 ei->hint_stat.eidx = 0; 315 ei->hint_stat.clu = sbi->root_dir; 316 ei->hint_femp.eidx = EXFAT_HINT_NONE; 317 318 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 319 if (exfat_count_num_clusters(sb, &cdir, &num_clu)) 320 return -EIO; 321 i_size_write(inode, num_clu << sbi->cluster_size_bits); 322 323 num_subdirs = exfat_count_dir_entries(sb, &cdir); 324 if (num_subdirs < 0) 325 return -EIO; 326 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); 327 328 inode->i_uid = sbi->options.fs_uid; 329 inode->i_gid = sbi->options.fs_gid; 330 inode_inc_iversion(inode); 331 inode->i_generation = 0; 332 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); 333 inode->i_op = &exfat_dir_inode_operations; 334 inode->i_fop = &exfat_dir_operations; 335 336 inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) 337 & ~(sbi->cluster_size - 1)) >> inode->i_blkbits; 338 EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; 339 EXFAT_I(inode)->i_size_aligned = i_size_read(inode); 340 EXFAT_I(inode)->i_size_ondisk = i_size_read(inode); 341 342 exfat_save_attr(inode, ATTR_SUBDIR); 343 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 344 current_time(inode); 345 exfat_truncate_atime(&inode->i_atime); 346 exfat_cache_init_inode(inode); 347 return 0; 348 } 349 350 static struct pbr *exfat_read_pbr_with_logical_sector(struct super_block *sb) 351 { 352 struct exfat_sb_info *sbi = EXFAT_SB(sb); 353 struct pbr *p_pbr = (struct pbr *) (sbi->pbr_bh)->b_data; 354 unsigned short logical_sect = 0; 355 356 logical_sect = 1 << p_pbr->bsx.f64.sect_size_bits; 357 358 if (!is_power_of_2(logical_sect) || 359 logical_sect < 512 || logical_sect > 4096) { 360 exfat_msg(sb, KERN_ERR, "bogus logical sector size %u", 361 logical_sect); 362 return NULL; 363 } 364 365 if (logical_sect < sb->s_blocksize) { 366 exfat_msg(sb, KERN_ERR, 367 "logical sector size too small for device (logical sector size = %u)", 368 logical_sect); 369 return NULL; 370 } 371 372 if (logical_sect > sb->s_blocksize) { 373 brelse(sbi->pbr_bh); 374 sbi->pbr_bh = NULL; 375 376 if (!sb_set_blocksize(sb, logical_sect)) { 377 exfat_msg(sb, KERN_ERR, 378 "unable to set blocksize %u", logical_sect); 379 return NULL; 380 } 381 sbi->pbr_bh = sb_bread(sb, 0); 382 if (!sbi->pbr_bh) { 383 exfat_msg(sb, KERN_ERR, 384 "unable to read boot sector (logical sector size = %lu)", 385 sb->s_blocksize); 386 return NULL; 387 } 388 389 p_pbr = (struct pbr *)sbi->pbr_bh->b_data; 390 } 391 return p_pbr; 392 } 393 394 /* mount the file system volume */ 395 static int __exfat_fill_super(struct super_block *sb) 396 { 397 int ret; 398 struct pbr *p_pbr; 399 struct pbr64 *p_bpb; 400 struct exfat_sb_info *sbi = EXFAT_SB(sb); 401 402 /* set block size to read super block */ 403 sb_min_blocksize(sb, 512); 404 405 /* read boot sector */ 406 sbi->pbr_bh = sb_bread(sb, 0); 407 if (!sbi->pbr_bh) { 408 exfat_msg(sb, KERN_ERR, "unable to read boot sector"); 409 return -EIO; 410 } 411 412 /* PRB is read */ 413 p_pbr = (struct pbr *)sbi->pbr_bh->b_data; 414 415 /* check the validity of PBR */ 416 if (le16_to_cpu((p_pbr->signature)) != PBR_SIGNATURE) { 417 exfat_msg(sb, KERN_ERR, "invalid boot record signature"); 418 ret = -EINVAL; 419 goto free_bh; 420 } 421 422 423 /* check logical sector size */ 424 p_pbr = exfat_read_pbr_with_logical_sector(sb); 425 if (!p_pbr) { 426 ret = -EIO; 427 goto free_bh; 428 } 429 430 /* 431 * res_zero field must be filled with zero to prevent mounting 432 * from FAT volume. 433 */ 434 if (memchr_inv(p_pbr->bpb.f64.res_zero, 0, 435 sizeof(p_pbr->bpb.f64.res_zero))) { 436 ret = -EINVAL; 437 goto free_bh; 438 } 439 440 p_bpb = (struct pbr64 *)p_pbr; 441 if (!p_bpb->bsx.num_fats) { 442 exfat_msg(sb, KERN_ERR, "bogus number of FAT structure"); 443 ret = -EINVAL; 444 goto free_bh; 445 } 446 447 sbi->sect_per_clus = 1 << p_bpb->bsx.sect_per_clus_bits; 448 sbi->sect_per_clus_bits = p_bpb->bsx.sect_per_clus_bits; 449 sbi->cluster_size_bits = sbi->sect_per_clus_bits + sb->s_blocksize_bits; 450 sbi->cluster_size = 1 << sbi->cluster_size_bits; 451 sbi->num_FAT_sectors = le32_to_cpu(p_bpb->bsx.fat_length); 452 sbi->FAT1_start_sector = le32_to_cpu(p_bpb->bsx.fat_offset); 453 sbi->FAT2_start_sector = p_bpb->bsx.num_fats == 1 ? 454 sbi->FAT1_start_sector : 455 sbi->FAT1_start_sector + sbi->num_FAT_sectors; 456 sbi->data_start_sector = le32_to_cpu(p_bpb->bsx.clu_offset); 457 sbi->num_sectors = le64_to_cpu(p_bpb->bsx.vol_length); 458 /* because the cluster index starts with 2 */ 459 sbi->num_clusters = le32_to_cpu(p_bpb->bsx.clu_count) + 460 EXFAT_RESERVED_CLUSTERS; 461 462 sbi->root_dir = le32_to_cpu(p_bpb->bsx.root_cluster); 463 sbi->dentries_per_clu = 1 << 464 (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 465 466 sbi->vol_flag = le16_to_cpu(p_bpb->bsx.vol_flags); 467 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; 468 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; 469 470 if (le16_to_cpu(p_bpb->bsx.vol_flags) & VOL_DIRTY) { 471 sbi->vol_flag |= VOL_DIRTY; 472 exfat_msg(sb, KERN_WARNING, 473 "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); 474 } 475 476 /* exFAT file size is limited by a disk volume size */ 477 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << 478 sbi->cluster_size_bits; 479 480 ret = exfat_create_upcase_table(sb); 481 if (ret) { 482 exfat_msg(sb, KERN_ERR, "failed to load upcase table"); 483 goto free_bh; 484 } 485 486 ret = exfat_load_bitmap(sb); 487 if (ret) { 488 exfat_msg(sb, KERN_ERR, "failed to load alloc-bitmap"); 489 goto free_upcase_table; 490 } 491 492 ret = exfat_count_used_clusters(sb, &sbi->used_clusters); 493 if (ret) { 494 exfat_msg(sb, KERN_ERR, "failed to scan clusters"); 495 goto free_alloc_bitmap; 496 } 497 498 return 0; 499 500 free_alloc_bitmap: 501 exfat_free_bitmap(sbi); 502 free_upcase_table: 503 exfat_free_upcase_table(sbi); 504 free_bh: 505 brelse(sbi->pbr_bh); 506 return ret; 507 } 508 509 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) 510 { 511 struct exfat_sb_info *sbi = sb->s_fs_info; 512 struct exfat_mount_options *opts = &sbi->options; 513 struct inode *root_inode; 514 int err; 515 516 if (opts->allow_utime == (unsigned short)-1) 517 opts->allow_utime = ~opts->fs_dmask & 0022; 518 519 if (opts->discard) { 520 struct request_queue *q = bdev_get_queue(sb->s_bdev); 521 522 if (!blk_queue_discard(q)) { 523 exfat_msg(sb, KERN_WARNING, 524 "mounting with \"discard\" option, but the device does not support discard"); 525 opts->discard = 0; 526 } 527 } 528 529 sb->s_flags |= SB_NODIRATIME; 530 sb->s_magic = EXFAT_SUPER_MAGIC; 531 sb->s_op = &exfat_sops; 532 533 sb->s_time_gran = 10 * NSEC_PER_MSEC; 534 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; 535 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; 536 537 err = __exfat_fill_super(sb); 538 if (err) { 539 exfat_msg(sb, KERN_ERR, "failed to recognize exfat type"); 540 goto check_nls_io; 541 } 542 543 /* set up enough so that it can read an inode */ 544 exfat_hash_init(sb); 545 546 if (!strcmp(sbi->options.iocharset, "utf8")) 547 opts->utf8 = 1; 548 else { 549 sbi->nls_io = load_nls(sbi->options.iocharset); 550 if (!sbi->nls_io) { 551 exfat_msg(sb, KERN_ERR, "IO charset %s not found", 552 sbi->options.iocharset); 553 err = -EINVAL; 554 goto free_table; 555 } 556 } 557 558 if (sbi->options.utf8) 559 sb->s_d_op = &exfat_utf8_dentry_ops; 560 else 561 sb->s_d_op = &exfat_dentry_ops; 562 563 root_inode = new_inode(sb); 564 if (!root_inode) { 565 exfat_msg(sb, KERN_ERR, "failed to allocate root inode."); 566 err = -ENOMEM; 567 goto free_table; 568 } 569 570 root_inode->i_ino = EXFAT_ROOT_INO; 571 inode_set_iversion(root_inode, 1); 572 err = exfat_read_root(root_inode); 573 if (err) { 574 exfat_msg(sb, KERN_ERR, "failed to initialize root inode."); 575 goto put_inode; 576 } 577 578 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); 579 insert_inode_hash(root_inode); 580 581 sb->s_root = d_make_root(root_inode); 582 if (!sb->s_root) { 583 exfat_msg(sb, KERN_ERR, "failed to get the root dentry"); 584 err = -ENOMEM; 585 goto put_inode; 586 } 587 588 return 0; 589 590 put_inode: 591 iput(root_inode); 592 sb->s_root = NULL; 593 594 free_table: 595 exfat_free_upcase_table(sbi); 596 exfat_free_bitmap(sbi); 597 brelse(sbi->pbr_bh); 598 599 check_nls_io: 600 unload_nls(sbi->nls_io); 601 exfat_free_iocharset(sbi); 602 sb->s_fs_info = NULL; 603 kfree(sbi); 604 return err; 605 } 606 607 static int exfat_get_tree(struct fs_context *fc) 608 { 609 return get_tree_bdev(fc, exfat_fill_super); 610 } 611 612 static void exfat_free(struct fs_context *fc) 613 { 614 kfree(fc->s_fs_info); 615 } 616 617 static const struct fs_context_operations exfat_context_ops = { 618 .parse_param = exfat_parse_param, 619 .get_tree = exfat_get_tree, 620 .free = exfat_free, 621 }; 622 623 static int exfat_init_fs_context(struct fs_context *fc) 624 { 625 struct exfat_sb_info *sbi; 626 627 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); 628 if (!sbi) 629 return -ENOMEM; 630 631 mutex_init(&sbi->s_lock); 632 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 633 DEFAULT_RATELIMIT_BURST); 634 635 sbi->options.fs_uid = current_uid(); 636 sbi->options.fs_gid = current_gid(); 637 sbi->options.fs_fmask = current->fs->umask; 638 sbi->options.fs_dmask = current->fs->umask; 639 sbi->options.allow_utime = -1; 640 sbi->options.iocharset = exfat_default_iocharset; 641 sbi->options.errors = EXFAT_ERRORS_RO; 642 643 fc->s_fs_info = sbi; 644 fc->ops = &exfat_context_ops; 645 return 0; 646 } 647 648 static struct file_system_type exfat_fs_type = { 649 .owner = THIS_MODULE, 650 .name = "exfat", 651 .init_fs_context = exfat_init_fs_context, 652 .parameters = exfat_parameters, 653 .kill_sb = kill_block_super, 654 .fs_flags = FS_REQUIRES_DEV, 655 }; 656 657 static void exfat_inode_init_once(void *foo) 658 { 659 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; 660 661 INIT_HLIST_NODE(&ei->i_hash_fat); 662 inode_init_once(&ei->vfs_inode); 663 } 664 665 static int __init init_exfat_fs(void) 666 { 667 int err; 668 669 err = exfat_cache_init(); 670 if (err) 671 return err; 672 673 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", 674 sizeof(struct exfat_inode_info), 675 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 676 exfat_inode_init_once); 677 if (!exfat_inode_cachep) { 678 err = -ENOMEM; 679 goto shutdown_cache; 680 } 681 682 err = register_filesystem(&exfat_fs_type); 683 if (err) 684 goto destroy_cache; 685 686 return 0; 687 688 destroy_cache: 689 kmem_cache_destroy(exfat_inode_cachep); 690 shutdown_cache: 691 exfat_cache_shutdown(); 692 return err; 693 } 694 695 static void __exit exit_exfat_fs(void) 696 { 697 /* 698 * Make sure all delayed rcu free inodes are flushed before we 699 * destroy cache. 700 */ 701 rcu_barrier(); 702 kmem_cache_destroy(exfat_inode_cachep); 703 unregister_filesystem(&exfat_fs_type); 704 exfat_cache_shutdown(); 705 } 706 707 module_init(init_exfat_fs); 708 module_exit(exit_exfat_fs); 709 710 MODULE_ALIAS_FS("exfat"); 711 MODULE_LICENSE("GPL"); 712 MODULE_DESCRIPTION("exFAT filesystem support"); 713 MODULE_AUTHOR("Samsung Electronics Co., Ltd."); 714