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