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_put_super(struct super_block *sb) 35 { 36 struct exfat_sb_info *sbi = EXFAT_SB(sb); 37 38 mutex_lock(&sbi->s_lock); 39 exfat_free_bitmap(sbi); 40 brelse(sbi->boot_bh); 41 mutex_unlock(&sbi->s_lock); 42 43 unload_nls(sbi->nls_io); 44 exfat_free_upcase_table(sbi); 45 } 46 47 static int exfat_sync_fs(struct super_block *sb, int wait) 48 { 49 struct exfat_sb_info *sbi = EXFAT_SB(sb); 50 int err = 0; 51 52 if (!wait) 53 return 0; 54 55 /* If there are some dirty buffers in the bdev inode */ 56 mutex_lock(&sbi->s_lock); 57 sync_blockdev(sb->s_bdev); 58 if (exfat_clear_volume_dirty(sb)) 59 err = -EIO; 60 mutex_unlock(&sbi->s_lock); 61 return err; 62 } 63 64 static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) 65 { 66 struct super_block *sb = dentry->d_sb; 67 struct exfat_sb_info *sbi = EXFAT_SB(sb); 68 unsigned long long id = huge_encode_dev(sb->s_bdev->bd_dev); 69 70 if (sbi->used_clusters == EXFAT_CLUSTERS_UNTRACKED) { 71 mutex_lock(&sbi->s_lock); 72 if (exfat_count_used_clusters(sb, &sbi->used_clusters)) { 73 mutex_unlock(&sbi->s_lock); 74 return -EIO; 75 } 76 mutex_unlock(&sbi->s_lock); 77 } 78 79 buf->f_type = sb->s_magic; 80 buf->f_bsize = sbi->cluster_size; 81 buf->f_blocks = sbi->num_clusters - 2; /* clu 0 & 1 */ 82 buf->f_bfree = buf->f_blocks - sbi->used_clusters; 83 buf->f_bavail = buf->f_bfree; 84 buf->f_fsid = u64_to_fsid(id); 85 /* Unicode utf16 255 characters */ 86 buf->f_namelen = EXFAT_MAX_FILE_LEN * NLS_MAX_CHARSET_SIZE; 87 return 0; 88 } 89 90 static int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flags) 91 { 92 struct exfat_sb_info *sbi = EXFAT_SB(sb); 93 struct boot_sector *p_boot = (struct boot_sector *)sbi->boot_bh->b_data; 94 95 /* retain persistent-flags */ 96 new_flags |= sbi->vol_flags_persistent; 97 98 /* flags are not changed */ 99 if (sbi->vol_flags == new_flags) 100 return 0; 101 102 sbi->vol_flags = new_flags; 103 104 /* skip updating volume dirty flag, 105 * if this volume has been mounted with read-only 106 */ 107 if (sb_rdonly(sb)) 108 return 0; 109 110 p_boot->vol_flags = cpu_to_le16(new_flags); 111 112 set_buffer_uptodate(sbi->boot_bh); 113 mark_buffer_dirty(sbi->boot_bh); 114 115 __sync_dirty_buffer(sbi->boot_bh, REQ_SYNC | REQ_FUA | REQ_PREFLUSH); 116 117 return 0; 118 } 119 120 int exfat_set_volume_dirty(struct super_block *sb) 121 { 122 struct exfat_sb_info *sbi = EXFAT_SB(sb); 123 124 return exfat_set_vol_flags(sb, sbi->vol_flags | VOLUME_DIRTY); 125 } 126 127 int exfat_clear_volume_dirty(struct super_block *sb) 128 { 129 struct exfat_sb_info *sbi = EXFAT_SB(sb); 130 131 return exfat_set_vol_flags(sb, sbi->vol_flags & ~VOLUME_DIRTY); 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->keep_last_dots) 163 seq_puts(m, ",keep_last_dots"); 164 if (opts->sys_tz) 165 seq_puts(m, ",sys_tz"); 166 else if (opts->time_offset) 167 seq_printf(m, ",time_offset=%d", opts->time_offset); 168 return 0; 169 } 170 171 static struct inode *exfat_alloc_inode(struct super_block *sb) 172 { 173 struct exfat_inode_info *ei; 174 175 ei = alloc_inode_sb(sb, exfat_inode_cachep, GFP_NOFS); 176 if (!ei) 177 return NULL; 178 179 init_rwsem(&ei->truncate_lock); 180 return &ei->vfs_inode; 181 } 182 183 static void exfat_free_inode(struct inode *inode) 184 { 185 kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); 186 } 187 188 static const struct super_operations exfat_sops = { 189 .alloc_inode = exfat_alloc_inode, 190 .free_inode = exfat_free_inode, 191 .write_inode = exfat_write_inode, 192 .evict_inode = exfat_evict_inode, 193 .put_super = exfat_put_super, 194 .sync_fs = exfat_sync_fs, 195 .statfs = exfat_statfs, 196 .show_options = exfat_show_options, 197 }; 198 199 enum { 200 Opt_uid, 201 Opt_gid, 202 Opt_umask, 203 Opt_dmask, 204 Opt_fmask, 205 Opt_allow_utime, 206 Opt_charset, 207 Opt_errors, 208 Opt_discard, 209 Opt_keep_last_dots, 210 Opt_sys_tz, 211 Opt_time_offset, 212 213 /* Deprecated options */ 214 Opt_utf8, 215 Opt_debug, 216 Opt_namecase, 217 Opt_codepage, 218 }; 219 220 static const struct constant_table exfat_param_enums[] = { 221 { "continue", EXFAT_ERRORS_CONT }, 222 { "panic", EXFAT_ERRORS_PANIC }, 223 { "remount-ro", EXFAT_ERRORS_RO }, 224 {} 225 }; 226 227 static const struct fs_parameter_spec exfat_parameters[] = { 228 fsparam_u32("uid", Opt_uid), 229 fsparam_u32("gid", Opt_gid), 230 fsparam_u32oct("umask", Opt_umask), 231 fsparam_u32oct("dmask", Opt_dmask), 232 fsparam_u32oct("fmask", Opt_fmask), 233 fsparam_u32oct("allow_utime", Opt_allow_utime), 234 fsparam_string("iocharset", Opt_charset), 235 fsparam_enum("errors", Opt_errors, exfat_param_enums), 236 fsparam_flag("discard", Opt_discard), 237 fsparam_flag("keep_last_dots", Opt_keep_last_dots), 238 fsparam_flag("sys_tz", Opt_sys_tz), 239 fsparam_s32("time_offset", Opt_time_offset), 240 __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, 241 NULL), 242 __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, 243 NULL), 244 __fsparam(fs_param_is_u32, "namecase", Opt_namecase, 245 fs_param_deprecated, NULL), 246 __fsparam(fs_param_is_u32, "codepage", Opt_codepage, 247 fs_param_deprecated, NULL), 248 {} 249 }; 250 251 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) 252 { 253 struct exfat_sb_info *sbi = fc->s_fs_info; 254 struct exfat_mount_options *opts = &sbi->options; 255 struct fs_parse_result result; 256 int opt; 257 258 opt = fs_parse(fc, exfat_parameters, param, &result); 259 if (opt < 0) 260 return opt; 261 262 switch (opt) { 263 case Opt_uid: 264 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 265 break; 266 case Opt_gid: 267 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 268 break; 269 case Opt_umask: 270 opts->fs_fmask = result.uint_32; 271 opts->fs_dmask = result.uint_32; 272 break; 273 case Opt_dmask: 274 opts->fs_dmask = result.uint_32; 275 break; 276 case Opt_fmask: 277 opts->fs_fmask = result.uint_32; 278 break; 279 case Opt_allow_utime: 280 opts->allow_utime = result.uint_32 & 0022; 281 break; 282 case Opt_charset: 283 exfat_free_iocharset(sbi); 284 opts->iocharset = param->string; 285 param->string = NULL; 286 break; 287 case Opt_errors: 288 opts->errors = result.uint_32; 289 break; 290 case Opt_discard: 291 opts->discard = 1; 292 break; 293 case Opt_keep_last_dots: 294 opts->keep_last_dots = 1; 295 break; 296 case Opt_sys_tz: 297 opts->sys_tz = 1; 298 break; 299 case Opt_time_offset: 300 /* 301 * Make the limit 24 just in case someone invents something 302 * unusual. 303 */ 304 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) 305 return -EINVAL; 306 opts->time_offset = result.int_32; 307 break; 308 case Opt_utf8: 309 case Opt_debug: 310 case Opt_namecase: 311 case Opt_codepage: 312 break; 313 default: 314 return -EINVAL; 315 } 316 317 return 0; 318 } 319 320 static void exfat_hash_init(struct super_block *sb) 321 { 322 struct exfat_sb_info *sbi = EXFAT_SB(sb); 323 int i; 324 325 spin_lock_init(&sbi->inode_hash_lock); 326 for (i = 0; i < EXFAT_HASH_SIZE; i++) 327 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 328 } 329 330 static int exfat_read_root(struct inode *inode) 331 { 332 struct super_block *sb = inode->i_sb; 333 struct exfat_sb_info *sbi = EXFAT_SB(sb); 334 struct exfat_inode_info *ei = EXFAT_I(inode); 335 struct exfat_chain cdir; 336 int num_subdirs, num_clu = 0; 337 338 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 339 ei->entry = -1; 340 ei->start_clu = sbi->root_dir; 341 ei->flags = ALLOC_FAT_CHAIN; 342 ei->type = TYPE_DIR; 343 ei->version = 0; 344 ei->hint_bmap.off = EXFAT_EOF_CLUSTER; 345 ei->hint_stat.eidx = 0; 346 ei->hint_stat.clu = sbi->root_dir; 347 ei->hint_femp.eidx = EXFAT_HINT_NONE; 348 349 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 350 if (exfat_count_num_clusters(sb, &cdir, &num_clu)) 351 return -EIO; 352 i_size_write(inode, num_clu << sbi->cluster_size_bits); 353 354 num_subdirs = exfat_count_dir_entries(sb, &cdir); 355 if (num_subdirs < 0) 356 return -EIO; 357 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); 358 359 inode->i_uid = sbi->options.fs_uid; 360 inode->i_gid = sbi->options.fs_gid; 361 inode_inc_iversion(inode); 362 inode->i_generation = 0; 363 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); 364 inode->i_op = &exfat_dir_inode_operations; 365 inode->i_fop = &exfat_dir_operations; 366 367 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9; 368 ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; 369 ei->i_size_aligned = i_size_read(inode); 370 ei->i_size_ondisk = i_size_read(inode); 371 372 exfat_save_attr(inode, ATTR_SUBDIR); 373 inode->i_mtime = inode->i_atime = ei->i_crtime = inode_set_ctime_current(inode); 374 exfat_truncate_atime(&inode->i_atime); 375 return 0; 376 } 377 378 static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect) 379 { 380 struct exfat_sb_info *sbi = EXFAT_SB(sb); 381 382 if (!is_power_of_2(logical_sect)) { 383 exfat_err(sb, "bogus logical sector size %u", logical_sect); 384 return -EIO; 385 } 386 387 if (logical_sect < sb->s_blocksize) { 388 exfat_err(sb, "logical sector size too small for device (logical sector size = %u)", 389 logical_sect); 390 return -EIO; 391 } 392 393 if (logical_sect > sb->s_blocksize) { 394 brelse(sbi->boot_bh); 395 sbi->boot_bh = NULL; 396 397 if (!sb_set_blocksize(sb, logical_sect)) { 398 exfat_err(sb, "unable to set blocksize %u", 399 logical_sect); 400 return -EIO; 401 } 402 sbi->boot_bh = sb_bread(sb, 0); 403 if (!sbi->boot_bh) { 404 exfat_err(sb, "unable to read boot sector (logical sector size = %lu)", 405 sb->s_blocksize); 406 return -EIO; 407 } 408 } 409 return 0; 410 } 411 412 static int exfat_read_boot_sector(struct super_block *sb) 413 { 414 struct boot_sector *p_boot; 415 struct exfat_sb_info *sbi = EXFAT_SB(sb); 416 417 /* set block size to read super block */ 418 sb_min_blocksize(sb, 512); 419 420 /* read boot sector */ 421 sbi->boot_bh = sb_bread(sb, 0); 422 if (!sbi->boot_bh) { 423 exfat_err(sb, "unable to read boot sector"); 424 return -EIO; 425 } 426 p_boot = (struct boot_sector *)sbi->boot_bh->b_data; 427 428 /* check the validity of BOOT */ 429 if (le16_to_cpu((p_boot->signature)) != BOOT_SIGNATURE) { 430 exfat_err(sb, "invalid boot record signature"); 431 return -EINVAL; 432 } 433 434 if (memcmp(p_boot->fs_name, STR_EXFAT, BOOTSEC_FS_NAME_LEN)) { 435 exfat_err(sb, "invalid fs_name"); /* fs_name may unprintable */ 436 return -EINVAL; 437 } 438 439 /* 440 * must_be_zero field must be filled with zero to prevent mounting 441 * from FAT volume. 442 */ 443 if (memchr_inv(p_boot->must_be_zero, 0, sizeof(p_boot->must_be_zero))) 444 return -EINVAL; 445 446 if (p_boot->num_fats != 1 && p_boot->num_fats != 2) { 447 exfat_err(sb, "bogus number of FAT structure"); 448 return -EINVAL; 449 } 450 451 /* 452 * sect_size_bits could be at least 9 and at most 12. 453 */ 454 if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS || 455 p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) { 456 exfat_err(sb, "bogus sector size bits : %u", 457 p_boot->sect_size_bits); 458 return -EINVAL; 459 } 460 461 /* 462 * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits. 463 */ 464 if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) { 465 exfat_err(sb, "bogus sectors bits per cluster : %u", 466 p_boot->sect_per_clus_bits); 467 return -EINVAL; 468 } 469 470 sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits; 471 sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits; 472 sbi->cluster_size_bits = p_boot->sect_per_clus_bits + 473 p_boot->sect_size_bits; 474 sbi->cluster_size = 1 << sbi->cluster_size_bits; 475 sbi->num_FAT_sectors = le32_to_cpu(p_boot->fat_length); 476 sbi->FAT1_start_sector = le32_to_cpu(p_boot->fat_offset); 477 sbi->FAT2_start_sector = le32_to_cpu(p_boot->fat_offset); 478 if (p_boot->num_fats == 2) 479 sbi->FAT2_start_sector += sbi->num_FAT_sectors; 480 sbi->data_start_sector = le32_to_cpu(p_boot->clu_offset); 481 sbi->num_sectors = le64_to_cpu(p_boot->vol_length); 482 /* because the cluster index starts with 2 */ 483 sbi->num_clusters = le32_to_cpu(p_boot->clu_count) + 484 EXFAT_RESERVED_CLUSTERS; 485 486 sbi->root_dir = le32_to_cpu(p_boot->root_cluster); 487 sbi->dentries_per_clu = 1 << 488 (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 489 490 sbi->vol_flags = le16_to_cpu(p_boot->vol_flags); 491 sbi->vol_flags_persistent = sbi->vol_flags & (VOLUME_DIRTY | MEDIA_FAILURE); 492 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; 493 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; 494 495 /* check consistencies */ 496 if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits < 497 (u64)sbi->num_clusters * 4) { 498 exfat_err(sb, "bogus fat length"); 499 return -EINVAL; 500 } 501 502 if (sbi->data_start_sector < 503 (u64)sbi->FAT1_start_sector + 504 (u64)sbi->num_FAT_sectors * p_boot->num_fats) { 505 exfat_err(sb, "bogus data start sector"); 506 return -EINVAL; 507 } 508 509 if (sbi->vol_flags & VOLUME_DIRTY) 510 exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); 511 if (sbi->vol_flags & MEDIA_FAILURE) 512 exfat_warn(sb, "Medium has reported failures. Some data may be lost."); 513 514 /* exFAT file size is limited by a disk volume size */ 515 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << 516 sbi->cluster_size_bits; 517 518 /* check logical sector size */ 519 if (exfat_calibrate_blocksize(sb, 1 << p_boot->sect_size_bits)) 520 return -EIO; 521 522 return 0; 523 } 524 525 static int exfat_verify_boot_region(struct super_block *sb) 526 { 527 struct buffer_head *bh = NULL; 528 u32 chksum = 0; 529 __le32 *p_sig, *p_chksum; 530 int sn, i; 531 532 /* read boot sector sub-regions */ 533 for (sn = 0; sn < 11; sn++) { 534 bh = sb_bread(sb, sn); 535 if (!bh) 536 return -EIO; 537 538 if (sn != 0 && sn <= 8) { 539 /* extended boot sector sub-regions */ 540 p_sig = (__le32 *)&bh->b_data[sb->s_blocksize - 4]; 541 if (le32_to_cpu(*p_sig) != EXBOOT_SIGNATURE) 542 exfat_warn(sb, "Invalid exboot-signature(sector = %d): 0x%08x", 543 sn, le32_to_cpu(*p_sig)); 544 } 545 546 chksum = exfat_calc_chksum32(bh->b_data, sb->s_blocksize, 547 chksum, sn ? CS_DEFAULT : CS_BOOT_SECTOR); 548 brelse(bh); 549 } 550 551 /* boot checksum sub-regions */ 552 bh = sb_bread(sb, sn); 553 if (!bh) 554 return -EIO; 555 556 for (i = 0; i < sb->s_blocksize; i += sizeof(u32)) { 557 p_chksum = (__le32 *)&bh->b_data[i]; 558 if (le32_to_cpu(*p_chksum) != chksum) { 559 exfat_err(sb, "Invalid boot checksum (boot checksum : 0x%08x, checksum : 0x%08x)", 560 le32_to_cpu(*p_chksum), chksum); 561 brelse(bh); 562 return -EINVAL; 563 } 564 } 565 brelse(bh); 566 return 0; 567 } 568 569 /* mount the file system volume */ 570 static int __exfat_fill_super(struct super_block *sb) 571 { 572 int ret; 573 struct exfat_sb_info *sbi = EXFAT_SB(sb); 574 575 ret = exfat_read_boot_sector(sb); 576 if (ret) { 577 exfat_err(sb, "failed to read boot sector"); 578 goto free_bh; 579 } 580 581 ret = exfat_verify_boot_region(sb); 582 if (ret) { 583 exfat_err(sb, "invalid boot region"); 584 goto free_bh; 585 } 586 587 ret = exfat_create_upcase_table(sb); 588 if (ret) { 589 exfat_err(sb, "failed to load upcase table"); 590 goto free_bh; 591 } 592 593 ret = exfat_load_bitmap(sb); 594 if (ret) { 595 exfat_err(sb, "failed to load alloc-bitmap"); 596 goto free_upcase_table; 597 } 598 599 ret = exfat_count_used_clusters(sb, &sbi->used_clusters); 600 if (ret) { 601 exfat_err(sb, "failed to scan clusters"); 602 goto free_alloc_bitmap; 603 } 604 605 return 0; 606 607 free_alloc_bitmap: 608 exfat_free_bitmap(sbi); 609 free_upcase_table: 610 exfat_free_upcase_table(sbi); 611 free_bh: 612 brelse(sbi->boot_bh); 613 return ret; 614 } 615 616 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) 617 { 618 struct exfat_sb_info *sbi = sb->s_fs_info; 619 struct exfat_mount_options *opts = &sbi->options; 620 struct inode *root_inode; 621 int err; 622 623 if (opts->allow_utime == (unsigned short)-1) 624 opts->allow_utime = ~opts->fs_dmask & 0022; 625 626 if (opts->discard && !bdev_max_discard_sectors(sb->s_bdev)) { 627 exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard"); 628 opts->discard = 0; 629 } 630 631 sb->s_flags |= SB_NODIRATIME; 632 sb->s_magic = EXFAT_SUPER_MAGIC; 633 sb->s_op = &exfat_sops; 634 635 sb->s_time_gran = 10 * NSEC_PER_MSEC; 636 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; 637 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; 638 639 err = __exfat_fill_super(sb); 640 if (err) { 641 exfat_err(sb, "failed to recognize exfat type"); 642 goto check_nls_io; 643 } 644 645 /* set up enough so that it can read an inode */ 646 exfat_hash_init(sb); 647 648 if (!strcmp(sbi->options.iocharset, "utf8")) 649 opts->utf8 = 1; 650 else { 651 sbi->nls_io = load_nls(sbi->options.iocharset); 652 if (!sbi->nls_io) { 653 exfat_err(sb, "IO charset %s not found", 654 sbi->options.iocharset); 655 err = -EINVAL; 656 goto free_table; 657 } 658 } 659 660 if (sbi->options.utf8) 661 sb->s_d_op = &exfat_utf8_dentry_ops; 662 else 663 sb->s_d_op = &exfat_dentry_ops; 664 665 root_inode = new_inode(sb); 666 if (!root_inode) { 667 exfat_err(sb, "failed to allocate root inode"); 668 err = -ENOMEM; 669 goto free_table; 670 } 671 672 root_inode->i_ino = EXFAT_ROOT_INO; 673 inode_set_iversion(root_inode, 1); 674 err = exfat_read_root(root_inode); 675 if (err) { 676 exfat_err(sb, "failed to initialize root inode"); 677 goto put_inode; 678 } 679 680 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); 681 insert_inode_hash(root_inode); 682 683 sb->s_root = d_make_root(root_inode); 684 if (!sb->s_root) { 685 exfat_err(sb, "failed to get the root dentry"); 686 err = -ENOMEM; 687 goto free_table; 688 } 689 690 return 0; 691 692 put_inode: 693 iput(root_inode); 694 sb->s_root = NULL; 695 696 free_table: 697 exfat_free_upcase_table(sbi); 698 exfat_free_bitmap(sbi); 699 brelse(sbi->boot_bh); 700 701 check_nls_io: 702 unload_nls(sbi->nls_io); 703 return err; 704 } 705 706 static int exfat_get_tree(struct fs_context *fc) 707 { 708 return get_tree_bdev(fc, exfat_fill_super); 709 } 710 711 static void exfat_free_sbi(struct exfat_sb_info *sbi) 712 { 713 exfat_free_iocharset(sbi); 714 kfree(sbi); 715 } 716 717 static void exfat_free(struct fs_context *fc) 718 { 719 struct exfat_sb_info *sbi = fc->s_fs_info; 720 721 if (sbi) 722 exfat_free_sbi(sbi); 723 } 724 725 static int exfat_reconfigure(struct fs_context *fc) 726 { 727 fc->sb_flags |= SB_NODIRATIME; 728 729 /* volume flag will be updated in exfat_sync_fs */ 730 sync_filesystem(fc->root->d_sb); 731 return 0; 732 } 733 734 static const struct fs_context_operations exfat_context_ops = { 735 .parse_param = exfat_parse_param, 736 .get_tree = exfat_get_tree, 737 .free = exfat_free, 738 .reconfigure = exfat_reconfigure, 739 }; 740 741 static int exfat_init_fs_context(struct fs_context *fc) 742 { 743 struct exfat_sb_info *sbi; 744 745 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); 746 if (!sbi) 747 return -ENOMEM; 748 749 mutex_init(&sbi->s_lock); 750 mutex_init(&sbi->bitmap_lock); 751 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 752 DEFAULT_RATELIMIT_BURST); 753 754 sbi->options.fs_uid = current_uid(); 755 sbi->options.fs_gid = current_gid(); 756 sbi->options.fs_fmask = current->fs->umask; 757 sbi->options.fs_dmask = current->fs->umask; 758 sbi->options.allow_utime = -1; 759 sbi->options.iocharset = exfat_default_iocharset; 760 sbi->options.errors = EXFAT_ERRORS_RO; 761 762 fc->s_fs_info = sbi; 763 fc->ops = &exfat_context_ops; 764 return 0; 765 } 766 767 static void exfat_kill_sb(struct super_block *sb) 768 { 769 struct exfat_sb_info *sbi = sb->s_fs_info; 770 771 kill_block_super(sb); 772 if (sbi) 773 exfat_free_sbi(sbi); 774 } 775 776 static struct file_system_type exfat_fs_type = { 777 .owner = THIS_MODULE, 778 .name = "exfat", 779 .init_fs_context = exfat_init_fs_context, 780 .parameters = exfat_parameters, 781 .kill_sb = exfat_kill_sb, 782 .fs_flags = FS_REQUIRES_DEV, 783 }; 784 785 static void exfat_inode_init_once(void *foo) 786 { 787 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; 788 789 spin_lock_init(&ei->cache_lru_lock); 790 ei->nr_caches = 0; 791 ei->cache_valid_id = EXFAT_CACHE_VALID + 1; 792 INIT_LIST_HEAD(&ei->cache_lru); 793 INIT_HLIST_NODE(&ei->i_hash_fat); 794 inode_init_once(&ei->vfs_inode); 795 } 796 797 static int __init init_exfat_fs(void) 798 { 799 int err; 800 801 err = exfat_cache_init(); 802 if (err) 803 return err; 804 805 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", 806 sizeof(struct exfat_inode_info), 807 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 808 exfat_inode_init_once); 809 if (!exfat_inode_cachep) { 810 err = -ENOMEM; 811 goto shutdown_cache; 812 } 813 814 err = register_filesystem(&exfat_fs_type); 815 if (err) 816 goto destroy_cache; 817 818 return 0; 819 820 destroy_cache: 821 kmem_cache_destroy(exfat_inode_cachep); 822 shutdown_cache: 823 exfat_cache_shutdown(); 824 return err; 825 } 826 827 static void __exit exit_exfat_fs(void) 828 { 829 /* 830 * Make sure all delayed rcu free inodes are flushed before we 831 * destroy cache. 832 */ 833 rcu_barrier(); 834 kmem_cache_destroy(exfat_inode_cachep); 835 unregister_filesystem(&exfat_fs_type); 836 exfat_cache_shutdown(); 837 } 838 839 module_init(init_exfat_fs); 840 module_exit(exit_exfat_fs); 841 842 MODULE_ALIAS_FS("exfat"); 843 MODULE_LICENSE("GPL"); 844 MODULE_DESCRIPTION("exFAT filesystem support"); 845 MODULE_AUTHOR("Samsung Electronics Co., Ltd."); 846