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 #include <linux/magic.h> 21 22 #include "exfat_raw.h" 23 #include "exfat_fs.h" 24 25 static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; 26 static struct kmem_cache *exfat_inode_cachep; 27 28 static void exfat_free_iocharset(struct exfat_sb_info *sbi) 29 { 30 if (sbi->options.iocharset != exfat_default_iocharset) 31 kfree(sbi->options.iocharset); 32 } 33 34 static void exfat_delayed_free(struct rcu_head *p) 35 { 36 struct exfat_sb_info *sbi = container_of(p, struct exfat_sb_info, rcu); 37 38 unload_nls(sbi->nls_io); 39 exfat_free_iocharset(sbi); 40 exfat_free_upcase_table(sbi); 41 kfree(sbi); 42 } 43 44 static void exfat_put_super(struct super_block *sb) 45 { 46 struct exfat_sb_info *sbi = EXFAT_SB(sb); 47 48 mutex_lock(&sbi->s_lock); 49 exfat_free_bitmap(sbi); 50 brelse(sbi->boot_bh); 51 mutex_unlock(&sbi->s_lock); 52 53 call_rcu(&sbi->rcu, exfat_delayed_free); 54 } 55 56 static int exfat_sync_fs(struct super_block *sb, int wait) 57 { 58 struct exfat_sb_info *sbi = EXFAT_SB(sb); 59 int err = 0; 60 61 if (!wait) 62 return 0; 63 64 /* If there are some dirty buffers in the bdev inode */ 65 mutex_lock(&sbi->s_lock); 66 sync_blockdev(sb->s_bdev); 67 if (exfat_clear_volume_dirty(sb)) 68 err = -EIO; 69 mutex_unlock(&sbi->s_lock); 70 return err; 71 } 72 73 static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) 74 { 75 struct super_block *sb = dentry->d_sb; 76 struct exfat_sb_info *sbi = EXFAT_SB(sb); 77 unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); 78 79 if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { 80 mutex_lock(&sbi->s_lock); 81 if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { 82 mutex_unlock(&sbi->s_lock); 83 return -EIO; 84 } 85 mutex_unlock(&sbi->s_lock); 86 } 87 88 buf->f_type = sb->s_magic; 89 buf->f_bsize = sbi->cluster_size; 90 buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ 91 buf->f_bfree = buf->f_blocks - sbi->used_clusters; 92 buf->f_bavail = buf->f_bfree; 93 buf->f_fsid = u64_to_fsid(id); 94 /* Unicode utf16 255 characters */ 95 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; 96 return 0; 97 } 98 99 static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) 100 { 101 struct exfat_sb_info *sbi = EXFAT_SB(sb); 102 struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; 103 bool sync; 104 105 /* retain persistent-flags */ 106 new_flags |= sbi->vol_flags_persistent; 107 108 /* flags are not changed */ 109 if (sbi->vol_flags == new_flags) 110 return 0; 111 112 sbi->vol_flags = new_flags; 113 114 /* skip updating volume dirty flag, 115 * if this volume has been mounted with read-only 116 */ 117 if (sb_rdonly(sb)) 118 return 0; 119 120 p_boot->vol_flags = cpu_to_le16(new_flags); 121 122 if ((new_flags & VOLUME_DIRTY) && !buffer_dirty(sbi->boot_bh)) 123 sync = true; 124 else 125 sync = false; 126 127 set_buffer_uptodate(sbi->boot_bh); 128 mark_buffer_dirty(sbi->boot_bh); 129 130 if (sync) 131 sync_dirty_buffer(sbi->boot_bh); 132 return 0; 133 } 134 135 int exfat_set_volume_dirty(struct super_block *sb) 136 { 137 struct exfat_sb_info *sbi = EXFAT_SB(sb); 138 139 return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); 140 } 141 142 int exfat_clear_volume_dirty(struct super_block *sb) 143 { 144 struct exfat_sb_info *sbi = EXFAT_SB(sb); 145 146 return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); 147 } 148 149 static int exfat_show_options(struct seq_file *m, struct dentry *root) 150 { 151 struct super_block *sb = root->d_sb; 152 struct exfat_sb_info *sbi = EXFAT_SB(sb); 153 struct exfat_mount_options *opts = &sbi->options; 154 155 /* Show partition info */ 156 if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) 157 seq_printf(m, ",uid=%u", 158 from_kuid_munged(&init_user_ns, opts->fs_uid)); 159 if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) 160 seq_printf(m, ",gid=%u", 161 from_kgid_munged(&init_user_ns, opts->fs_gid)); 162 seq_printf(m, ",fmask=%04o,dmask=%04o", opts->fs_fmask, opts->fs_dmask); 163 if (opts->allow_utime) 164 seq_printf(m, ",allow_utime=%04o", opts->allow_utime); 165 if (opts->utf8) 166 seq_puts(m, ",iocharset=utf8"); 167 else if (sbi->nls_io) 168 seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); 169 if (opts->errors == EXFAT_ERRORS_CONT) 170 seq_puts(m, ",errors=continue"); 171 else if (opts->errors == EXFAT_ERRORS_PANIC) 172 seq_puts(m, ",errors=panic"); 173 else 174 seq_puts(m, ",errors=remount-ro"); 175 if (opts->discard) 176 seq_puts(m, ",discard"); 177 if (opts->time_offset) 178 seq_printf(m, ",time_offset=%d", opts->time_offset); 179 return 0; 180 } 181 182 static struct inode *exfat_alloc_inode(struct super_block *sb) 183 { 184 struct exfat_inode_info *ei; 185 186 ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); 187 if (!ei) 188 return NULL; 189 190 init_rwsem(&ei->truncate_lock); 191 return &ei->vfs_inode; 192 } 193 194 static void exfat_free_inode(struct inode *inode) 195 { 196 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); 197 } 198 199 static const struct super_operations exfat_sops = { 200 .alloc_inode = exfat_alloc_inode, 201 .free_inode = exfat_free_inode, 202 .write_inode = exfat_write_inode, 203 .evict_inode = exfat_evict_inode, 204 .put_super = exfat_put_super, 205 .sync_fs = exfat_sync_fs, 206 .statfs = exfat_statfs, 207 .show_options = exfat_show_options, 208 }; 209 210 enum { 211 Opt_uid, 212 Opt_gid, 213 Opt_umask, 214 Opt_dmask, 215 Opt_fmask, 216 Opt_allow_utime, 217 Opt_charset, 218 Opt_errors, 219 Opt_discard, 220 Opt_time_offset, 221 222 /* Deprecated options */ 223 Opt_utf8, 224 Opt_debug, 225 Opt_namecase, 226 Opt_codepage, 227 }; 228 229 static const struct constant_table exfat_param_enums[] = { 230 { "continue", EXFAT_ERRORS_CONT }, 231 { "panic", EXFAT_ERRORS_PANIC }, 232 { "remount-ro", EXFAT_ERRORS_RO }, 233 {} 234 }; 235 236 static const struct fs_parameter_spec exfat_parameters[] = { 237 fsparam_u32("uid", Opt_uid), 238 fsparam_u32("gid", Opt_gid), 239 fsparam_u32oct("umask", Opt_umask), 240 fsparam_u32oct("dmask", Opt_dmask), 241 fsparam_u32oct("fmask", Opt_fmask), 242 fsparam_u32oct("allow_utime", Opt_allow_utime), 243 fsparam_string("iocharset", Opt_charset), 244 fsparam_enum("errors", Opt_errors, exfat_param_enums), 245 fsparam_flag("discard", Opt_discard), 246 fsparam_s32("time_offset", Opt_time_offset), 247 __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, 248 NULL), 249 __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, 250 NULL), 251 __fsparam(fs_param_is_u32, "namecase", Opt_namecase, 252 fs_param_deprecated, NULL), 253 __fsparam(fs_param_is_u32, "codepage", Opt_codepage, 254 fs_param_deprecated, NULL), 255 {} 256 }; 257 258 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) 259 { 260 struct exfat_sb_info *sbi = fc->s_fs_info; 261 struct exfat_mount_options *opts = &sbi->options; 262 struct fs_parse_result result; 263 int opt; 264 265 opt = fs_parse(fc, exfat_parameters, param, &result); 266 if (opt < 0) 267 return opt; 268 269 switch (opt) { 270 case Opt_uid: 271 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 272 break; 273 case Opt_gid: 274 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 275 break; 276 case Opt_umask: 277 opts->fs_fmask = result.uint_32; 278 opts->fs_dmask = result.uint_32; 279 break; 280 case Opt_dmask: 281 opts->fs_dmask = result.uint_32; 282 break; 283 case Opt_fmask: 284 opts->fs_fmask = result.uint_32; 285 break; 286 case Opt_allow_utime: 287 opts->allow_utime = result.uint_32 & 0022; 288 break; 289 case Opt_charset: 290 exfat_free_iocharset(sbi); 291 opts->iocharset = param->string; 292 param->string = NULL; 293 break; 294 case Opt_errors: 295 opts->errors = result.uint_32; 296 break; 297 case Opt_discard: 298 opts->discard = 1; 299 break; 300 case Opt_time_offset: 301 /* 302 * Make the limit 24 just in case someone invents something 303 * unusual. 304 */ 305 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) 306 return -EINVAL; 307 opts->time_offset = result.int_32; 308 break; 309 case Opt_utf8: 310 case Opt_debug: 311 case Opt_namecase: 312 case Opt_codepage: 313 break; 314 default: 315 return -EINVAL; 316 } 317 318 return 0; 319 } 320 321 static void exfat_hash_init(struct super_block *sb) 322 { 323 struct exfat_sb_info *sbi = EXFAT_SB(sb); 324 int i; 325 326 spin_lock_init(&sbi->inode_hash_lock); 327 for (i = 0; i < EXFAT_HASH_SIZE; i++) 328 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 329 } 330 331 static int exfat_read_root(struct inode *inode) 332 { 333 struct super_block *sb = inode->i_sb; 334 struct exfat_sb_info *sbi = EXFAT_SB(sb); 335 struct exfat_inode_info *ei = EXFAT_I(inode); 336 struct exfat_chain cdir; 337 int num_subdirs, num_clu = 0; 338 339 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 340 ei->entry = -1; 341 ei->start_clu = sbi->root_dir; 342 ei->flags = ALLOC_FAT_CHAIN; 343 ei->type = TYPE_DIR; 344 ei->version = 0; 345 ei->hint_bmap.off = EXFAT_EOF_CLUSTER; 346 ei->hint_stat.eidx = 0; 347 ei->hint_stat.clu = sbi->root_dir; 348 ei->hint_femp.eidx = EXFAT_HINT_NONE; 349 350 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 351 if (exfat_count_num_clusters(sb, &cdir, &num_clu)) 352 return -EIO; 353 i_size_write(inode, num_clu << sbi->cluster_size_bits); 354 355 num_subdirs = exfat_count_dir_entries(sb, &cdir); 356 if (num_subdirs < 0) 357 return -EIO; 358 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); 359 360 inode->i_uid = sbi->options.fs_uid; 361 inode->i_gid = sbi->options.fs_gid; 362 inode_inc_iversion(inode); 363 inode->i_generation = 0; 364 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); 365 inode->i_op = &exfat_dir_inode_operations; 366 inode->i_fop = &exfat_dir_operations; 367 368 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 369 inode->i_blkbits; 370 ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; 371 ei->i_size_aligned = i_size_read(inode); 372 ei->i_size_ondisk = i_size_read(inode); 373 374 exfat_save_attr(inode, ATTR_SUBDIR); 375 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 376 current_time(inode); 377 exfat_truncate_atime(&inode->i_atime); 378 return 0; 379 } 380 381 static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) 382 { 383 struct exfat_sb_info *sbi = EXFAT_SB(sb); 384 385 if (!is_power_of_2(logical_sect)) { 386 exfat_err(sb, "bogus logical sector size %u", logical_sect); 387 return -EIO; 388 } 389 390 if (logical_sect < sb->s_blocksize) { 391 exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", 392 logical_sect); 393 return -EIO; 394 } 395 396 if (logical_sect > sb->s_blocksize) { 397 brelse(sbi->boot_bh); 398 sbi->boot_bh = NULL; 399 400 if (!sb_set_blocksize(sb, logical_sect)) { 401 exfat_err(sb, "unable to set blocksize %u", 402 logical_sect); 403 return -EIO; 404 } 405 sbi->boot_bh = sb_bread(sb, 0); 406 if (!sbi->boot_bh) { 407 exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", 408 sb->s_blocksize); 409 return -EIO; 410 } 411 } 412 return 0; 413 } 414 415 static int exfat_read_boot_sector(struct super_block *sb) 416 { 417 struct boot_sector *p_boot; 418 struct exfat_sb_info *sbi = EXFAT_SB(sb); 419 420 /* set block size to read super block */ 421 sb_min_blocksize(sb, 512); 422 423 /* read boot sector */ 424 sbi->boot_bh = sb_bread(sb, 0); 425 if (!sbi->boot_bh) { 426 exfat_err(sb, "unable to read boot sector"); 427 return -EIO; 428 } 429 p_boot = (struct boot_sector *)sbi->boot_bh->b_data; 430 431 /* check the validity of BOOT */ 432 if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { 433 exfat_err(sb, "invalid boot record signature"); 434 return -EINVAL; 435 } 436 437 if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { 438 exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ 439 return -EINVAL; 440 } 441 442 /* 443 * must_be_zero field must be filled with zero to prevent mounting 444 * from FAT volume. 445 */ 446 if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) 447 return -EINVAL; 448 449 if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { 450 exfat_err(sb, "bogus number of FAT structure"); 451 return -EINVAL; 452 } 453 454 /* 455 * sect_size_bits could be at least 9 and at most 12. 456 */ 457 if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || 458 p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { 459 exfat_err(sb, "bogus sector size bits : %u\n", 460 p_boot->sect_size_bits); 461 return -EINVAL; 462 } 463 464 /* 465 * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. 466 */ 467 if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { 468 exfat_err(sb, "bogus sectors bits per cluster : %u\n", 469 p_boot->sect_per_clus_bits); 470 return -EINVAL; 471 } 472 473 sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; 474 sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; 475 sbi->cluster_size_bits = p_boot->sect_per_clus_bits + 476 p_boot->sect_size_bits; 477 sbi->cluster_size = 1 << sbi->cluster_size_bits; 478 sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); 479 sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); 480 sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); 481 if (p_boot->num_fats == 2) 482 sbi->FAT2_start_sector += sbi->num_FAT_sectors; 483 sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); 484 sbi->num_sectors = le64_to_cpu(p_boot->vol_length); 485 /* because the cluster index starts with 2 */ 486 sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + 487 EXFAT_RESERVED_CLUSTERS; 488 489 sbi->root_dir = le32_to_cpu(p_boot->root_cluster); 490 sbi->dentries_per_clu = 1 << 491 (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 492 493 sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); 494 sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); 495 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; 496 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; 497 498 /* check consistencies */ 499 if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < 500 (u64)sbi->num_clusters * 4) { 501 exfat_err(sb, "bogus fat length"); 502 return -EINVAL; 503 } 504 505 if (sbi->data_start_sector < 506 (u64)sbi->FAT1_start_sector + 507 (u64)sbi->num_FAT_sectors * p_boot->num_fats) { 508 exfat_err(sb, "bogus data start sector"); 509 return -EINVAL; 510 } 511 512 if (sbi->vol_flags & VOLUME_DIRTY) 513 exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); 514 if (sbi->vol_flags & MEDIA_FAILURE) 515 exfat_warn(sb, "Medium has reported failures. Some data may be lost."); 516 517 /* exFAT file size is limited by a disk volume size */ 518 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << 519 sbi->cluster_size_bits; 520 521 /* check logical sector size */ 522 if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) 523 return -EIO; 524 525 return 0; 526 } 527 528 static int exfat_verify_boot_region(struct super_block *sb) 529 { 530 struct buffer_head *bh = NULL; 531 u32 chksum = 0; 532 __le32 *p_sig, *p_chksum; 533 int sn, i; 534 535 /* read boot sector sub-regions */ 536 for (sn = 0; sn < 11; sn++) { 537 bh = sb_bread(sb, sn); 538 if (!bh) 539 return -EIO; 540 541 if (sn != 0 && sn <= 8) { 542 /* extended boot sector sub-regions */ 543 p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; 544 if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) 545 exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", 546 sn, le32_to_cpu(*p_sig)); 547 } 548 549 chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, 550 chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); 551 brelse(bh); 552 } 553 554 /* boot checksum sub-regions */ 555 bh = sb_bread(sb, sn); 556 if (!bh) 557 return -EIO; 558 559 for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { 560 p_chksum = (__le32 *)&bh->b_data[i]; 561 if (le32_to_cpu(*p_chksum) != chksum) { 562 exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", 563 le32_to_cpu(*p_chksum), chksum); 564 brelse(bh); 565 return -EINVAL; 566 } 567 } 568 brelse(bh); 569 return 0; 570 } 571 572 /* mount the file system volume */ 573 static int __exfat_fill_super(struct super_block *sb) 574 { 575 int ret; 576 struct exfat_sb_info *sbi = EXFAT_SB(sb); 577 578 ret = exfat_read_boot_sector(sb); 579 if (ret) { 580 exfat_err(sb, "failed to read boot sector"); 581 goto free_bh; 582 } 583 584 ret = exfat_verify_boot_region(sb); 585 if (ret) { 586 exfat_err(sb, "invalid boot region"); 587 goto free_bh; 588 } 589 590 ret = exfat_create_upcase_table(sb); 591 if (ret) { 592 exfat_err(sb, "failed to load upcase table"); 593 goto free_bh; 594 } 595 596 ret = exfat_load_bitmap(sb); 597 if (ret) { 598 exfat_err(sb, "failed to load alloc-bitmap"); 599 goto free_upcase_table; 600 } 601 602 ret = exfat_count_used_clusters(sb, &sbi->used_clusters); 603 if (ret) { 604 exfat_err(sb, "failed to scan clusters"); 605 goto free_alloc_bitmap; 606 } 607 608 return 0; 609 610 free_alloc_bitmap: 611 exfat_free_bitmap(sbi); 612 free_upcase_table: 613 exfat_free_upcase_table(sbi); 614 free_bh: 615 brelse(sbi->boot_bh); 616 return ret; 617 } 618 619 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) 620 { 621 struct exfat_sb_info *sbi = sb->s_fs_info; 622 struct exfat_mount_options *opts = &sbi->options; 623 struct inode *root_inode; 624 int err; 625 626 if (opts->allow_utime == (unsigned short)-1) 627 opts->allow_utime = ~opts->fs_dmask & 0022; 628 629 if (opts->discard) { 630 struct request_queue *q = bdev_get_queue(sb->s_bdev); 631 632 if (!blk_queue_discard(q)) { 633 exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); 634 opts->discard = 0; 635 } 636 } 637 638 sb->s_flags |= SB_NODIRATIME; 639 sb->s_magic = EXFAT_SUPER_MAGIC; 640 sb->s_op = &exfat_sops; 641 642 sb->s_time_gran = 10 * NSEC_PER_MSEC; 643 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; 644 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; 645 646 err = __exfat_fill_super(sb); 647 if (err) { 648 exfat_err(sb, "failed to recognize exfat type"); 649 goto check_nls_io; 650 } 651 652 /* set up enough so that it can read an inode */ 653 exfat_hash_init(sb); 654 655 if (!strcmp(sbi->options.iocharset, "utf8")) 656 opts->utf8 = 1; 657 else { 658 sbi->nls_io = load_nls(sbi->options.iocharset); 659 if (!sbi->nls_io) { 660 exfat_err(sb, "IO charset %s not found", 661 sbi->options.iocharset); 662 err = -EINVAL; 663 goto free_table; 664 } 665 } 666 667 if (sbi->options.utf8) 668 sb->s_d_op = &exfat_utf8_dentry_ops; 669 else 670 sb->s_d_op = &exfat_dentry_ops; 671 672 root_inode = new_inode(sb); 673 if (!root_inode) { 674 exfat_err(sb, "failed to allocate root inode"); 675 err = -ENOMEM; 676 goto free_table; 677 } 678 679 root_inode->i_ino = EXFAT_ROOT_INO; 680 inode_set_iversion(root_inode, 1); 681 err = exfat_read_root(root_inode); 682 if (err) { 683 exfat_err(sb, "failed to initialize root inode"); 684 goto put_inode; 685 } 686 687 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); 688 insert_inode_hash(root_inode); 689 690 sb->s_root = d_make_root(root_inode); 691 if (!sb->s_root) { 692 exfat_err(sb, "failed to get the root dentry"); 693 err = -ENOMEM; 694 goto free_table; 695 } 696 697 return 0; 698 699 put_inode: 700 iput(root_inode); 701 sb->s_root = NULL; 702 703 free_table: 704 exfat_free_upcase_table(sbi); 705 exfat_free_bitmap(sbi); 706 brelse(sbi->boot_bh); 707 708 check_nls_io: 709 unload_nls(sbi->nls_io); 710 exfat_free_iocharset(sbi); 711 sb->s_fs_info = NULL; 712 kfree(sbi); 713 return err; 714 } 715 716 static int exfat_get_tree(struct fs_context *fc) 717 { 718 return get_tree_bdev(fc, exfat_fill_super); 719 } 720 721 static void exfat_free(struct fs_context *fc) 722 { 723 struct exfat_sb_info *sbi = fc->s_fs_info; 724 725 if (sbi) { 726 exfat_free_iocharset(sbi); 727 kfree(sbi); 728 } 729 } 730 731 static int exfat_reconfigure(struct fs_context *fc) 732 { 733 fc->sb_flags |= SB_NODIRATIME; 734 735 /* volume flag will be updated in exfat_sync_fs */ 736 sync_filesystem(fc->root->d_sb); 737 return 0; 738 } 739 740 static const struct fs_context_operations exfat_context_ops = { 741 .parse_param = exfat_parse_param, 742 .get_tree = exfat_get_tree, 743 .free = exfat_free, 744 .reconfigure = exfat_reconfigure, 745 }; 746 747 static int exfat_init_fs_context(struct fs_context *fc) 748 { 749 struct exfat_sb_info *sbi; 750 751 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); 752 if (!sbi) 753 return -ENOMEM; 754 755 mutex_init(&sbi->s_lock); 756 mutex_init(&sbi->bitmap_lock); 757 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 758 DEFAULT_RATELIMIT_BURST); 759 760 sbi->options.fs_uid = current_uid(); 761 sbi->options.fs_gid = current_gid(); 762 sbi->options.fs_fmask = current->fs->umask; 763 sbi->options.fs_dmask = current->fs->umask; 764 sbi->options.allow_utime = -1; 765 sbi->options.iocharset = exfat_default_iocharset; 766 sbi->options.errors = EXFAT_ERRORS_RO; 767 768 fc->s_fs_info = sbi; 769 fc->ops = &exfat_context_ops; 770 return 0; 771 } 772 773 static struct file_system_type exfat_fs_type = { 774 .owner = THIS_MODULE, 775 .name = "exfat", 776 .init_fs_context = exfat_init_fs_context, 777 .parameters = exfat_parameters, 778 .kill_sb = kill_block_super, 779 .fs_flags = FS_REQUIRES_DEV, 780 }; 781 782 static void exfat_inode_init_once(void *foo) 783 { 784 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; 785 786 spin_lock_init(&ei->cache_lru_lock); 787 ei->nr_caches = 0; 788 ei->cache_valid_id = EXFAT_CACHE_VALID + 1; 789 INIT_LIST_HEAD(&ei->cache_lru); 790 INIT_HLIST_NODE(&ei->i_hash_fat); 791 inode_init_once(&ei->vfs_inode); 792 } 793 794 static int __init init_exfat_fs(void) 795 { 796 int err; 797 798 err = exfat_cache_init(); 799 if (err) 800 return err; 801 802 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", 803 sizeof(struct exfat_inode_info), 804 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 805 exfat_inode_init_once); 806 if (!exfat_inode_cachep) { 807 err = -ENOMEM; 808 goto shutdown_cache; 809 } 810 811 err = register_filesystem(&exfat_fs_type); 812 if (err) 813 goto destroy_cache; 814 815 return 0; 816 817 destroy_cache: 818 kmem_cache_destroy(exfat_inode_cachep); 819 shutdown_cache: 820 exfat_cache_shutdown(); 821 return err; 822 } 823 824 static void __exit exit_exfat_fs(void) 825 { 826 /* 827 * Make sure all delayed rcu free inodes are flushed before we 828 * destroy cache. 829 */ 830 rcu_barrier(); 831 kmem_cache_destroy(exfat_inode_cachep); 832 unregister_filesystem(&exfat_fs_type); 833 exfat_cache_shutdown(); 834 } 835 836 module_init(init_exfat_fs); 837 module_exit(exit_exfat_fs); 838 839 MODULE_ALIAS_FS("exfat"); 840 MODULE_LICENSE("GPL"); 841 MODULE_DESCRIPTION("exFAT filesystem support"); 842 MODULE_AUTHOR("Samsung Electronics Co., Ltd."); 843