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 /* Deprecated options */ 208 Opt_utf8, 209 Opt_debug, 210 Opt_namecase, 211 Opt_codepage, 212 }; 213 214 static const struct constant_table exfat_param_enums[] = { 215 { "continue", EXFAT_ERRORS_CONT }, 216 { "panic", EXFAT_ERRORS_PANIC }, 217 { "remount-ro", EXFAT_ERRORS_RO }, 218 {} 219 }; 220 221 static const struct fs_parameter_spec exfat_parameters[] = { 222 fsparam_u32("uid", Opt_uid), 223 fsparam_u32("gid", Opt_gid), 224 fsparam_u32oct("umask", Opt_umask), 225 fsparam_u32oct("dmask", Opt_dmask), 226 fsparam_u32oct("fmask", Opt_fmask), 227 fsparam_u32oct("allow_utime", Opt_allow_utime), 228 fsparam_string("iocharset", Opt_charset), 229 fsparam_enum("errors", Opt_errors, exfat_param_enums), 230 fsparam_flag("discard", Opt_discard), 231 fsparam_s32("time_offset", Opt_time_offset), 232 __fsparam(NULL, "utf8", Opt_utf8, fs_param_deprecated, 233 NULL), 234 __fsparam(NULL, "debug", Opt_debug, fs_param_deprecated, 235 NULL), 236 __fsparam(fs_param_is_u32, "namecase", Opt_namecase, 237 fs_param_deprecated, NULL), 238 __fsparam(fs_param_is_u32, "codepage", Opt_codepage, 239 fs_param_deprecated, NULL), 240 {} 241 }; 242 243 static int exfat_parse_param(struct fs_context *fc, struct fs_parameter *param) 244 { 245 struct exfat_sb_info *sbi = fc->s_fs_info; 246 struct exfat_mount_options *opts = &sbi->options; 247 struct fs_parse_result result; 248 int opt; 249 250 opt = fs_parse(fc, exfat_parameters, param, &result); 251 if (opt < 0) 252 return opt; 253 254 switch (opt) { 255 case Opt_uid: 256 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 257 break; 258 case Opt_gid: 259 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 260 break; 261 case Opt_umask: 262 opts->fs_fmask = result.uint_32; 263 opts->fs_dmask = result.uint_32; 264 break; 265 case Opt_dmask: 266 opts->fs_dmask = result.uint_32; 267 break; 268 case Opt_fmask: 269 opts->fs_fmask = result.uint_32; 270 break; 271 case Opt_allow_utime: 272 opts->allow_utime = result.uint_32 & 0022; 273 break; 274 case Opt_charset: 275 exfat_free_iocharset(sbi); 276 opts->iocharset = kstrdup(param->string, GFP_KERNEL); 277 if (!opts->iocharset) 278 return -ENOMEM; 279 break; 280 case Opt_errors: 281 opts->errors = result.uint_32; 282 break; 283 case Opt_discard: 284 opts->discard = 1; 285 break; 286 case Opt_time_offset: 287 /* 288 * Make the limit 24 just in case someone invents something 289 * unusual. 290 */ 291 if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60) 292 return -EINVAL; 293 opts->time_offset = result.int_32; 294 break; 295 case Opt_utf8: 296 case Opt_debug: 297 case Opt_namecase: 298 case Opt_codepage: 299 break; 300 default: 301 return -EINVAL; 302 } 303 304 return 0; 305 } 306 307 static void exfat_hash_init(struct super_block *sb) 308 { 309 struct exfat_sb_info *sbi = EXFAT_SB(sb); 310 int i; 311 312 spin_lock_init(&sbi->inode_hash_lock); 313 for (i = 0; i < EXFAT_HASH_SIZE; i++) 314 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 315 } 316 317 static int exfat_read_root(struct inode *inode) 318 { 319 struct super_block *sb = inode->i_sb; 320 struct exfat_sb_info *sbi = EXFAT_SB(sb); 321 struct exfat_inode_info *ei = EXFAT_I(inode); 322 struct exfat_chain cdir; 323 int num_subdirs, num_clu = 0; 324 325 exfat_chain_set(&ei->dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 326 ei->entry = -1; 327 ei->start_clu = sbi->root_dir; 328 ei->flags = ALLOC_FAT_CHAIN; 329 ei->type = TYPE_DIR; 330 ei->version = 0; 331 ei->rwoffset = 0; 332 ei->hint_bmap.off = EXFAT_EOF_CLUSTER; 333 ei->hint_stat.eidx = 0; 334 ei->hint_stat.clu = sbi->root_dir; 335 ei->hint_femp.eidx = EXFAT_HINT_NONE; 336 337 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 338 if (exfat_count_num_clusters(sb, &cdir, &num_clu)) 339 return -EIO; 340 i_size_write(inode, num_clu << sbi->cluster_size_bits); 341 342 num_subdirs = exfat_count_dir_entries(sb, &cdir); 343 if (num_subdirs < 0) 344 return -EIO; 345 set_nlink(inode, num_subdirs + EXFAT_MIN_SUBDIR); 346 347 inode->i_uid = sbi->options.fs_uid; 348 inode->i_gid = sbi->options.fs_gid; 349 inode_inc_iversion(inode); 350 inode->i_generation = 0; 351 inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); 352 inode->i_op = &exfat_dir_inode_operations; 353 inode->i_fop = &exfat_dir_operations; 354 355 inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) 356 & ~(sbi->cluster_size - 1)) >> inode->i_blkbits; 357 EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff; 358 EXFAT_I(inode)->i_size_aligned = i_size_read(inode); 359 EXFAT_I(inode)->i_size_ondisk = i_size_read(inode); 360 361 exfat_save_attr(inode, ATTR_SUBDIR); 362 inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = 363 current_time(inode); 364 exfat_truncate_atime(&inode->i_atime); 365 exfat_cache_init_inode(inode); 366 return 0; 367 } 368 369 static struct pbr *exfat_read_pbr_with_logical_sector(struct super_block *sb) 370 { 371 struct exfat_sb_info *sbi = EXFAT_SB(sb); 372 struct pbr *p_pbr = (struct pbr *) (sbi->pbr_bh)->b_data; 373 unsigned short logical_sect = 0; 374 375 logical_sect = 1 << p_pbr->bsx.f64.sect_size_bits; 376 377 if (!is_power_of_2(logical_sect) || 378 logical_sect < 512 || logical_sect > 4096) { 379 exfat_msg(sb, KERN_ERR, "bogus logical sector size %u", 380 logical_sect); 381 return NULL; 382 } 383 384 if (logical_sect < sb->s_blocksize) { 385 exfat_msg(sb, KERN_ERR, 386 "logical sector size too small for device (logical sector size = %u)", 387 logical_sect); 388 return NULL; 389 } 390 391 if (logical_sect > sb->s_blocksize) { 392 brelse(sbi->pbr_bh); 393 sbi->pbr_bh = NULL; 394 395 if (!sb_set_blocksize(sb, logical_sect)) { 396 exfat_msg(sb, KERN_ERR, 397 "unable to set blocksize %u", logical_sect); 398 return NULL; 399 } 400 sbi->pbr_bh = sb_bread(sb, 0); 401 if (!sbi->pbr_bh) { 402 exfat_msg(sb, KERN_ERR, 403 "unable to read boot sector (logical sector size = %lu)", 404 sb->s_blocksize); 405 return NULL; 406 } 407 408 p_pbr = (struct pbr *)sbi->pbr_bh->b_data; 409 } 410 return p_pbr; 411 } 412 413 /* mount the file system volume */ 414 static int __exfat_fill_super(struct super_block *sb) 415 { 416 int ret; 417 struct pbr *p_pbr; 418 struct pbr64 *p_bpb; 419 struct exfat_sb_info *sbi = EXFAT_SB(sb); 420 421 /* set block size to read super block */ 422 sb_min_blocksize(sb, 512); 423 424 /* read boot sector */ 425 sbi->pbr_bh = sb_bread(sb, 0); 426 if (!sbi->pbr_bh) { 427 exfat_msg(sb, KERN_ERR, "unable to read boot sector"); 428 return -EIO; 429 } 430 431 /* PRB is read */ 432 p_pbr = (struct pbr *)sbi->pbr_bh->b_data; 433 434 /* check the validity of PBR */ 435 if (le16_to_cpu((p_pbr->signature)) != PBR_SIGNATURE) { 436 exfat_msg(sb, KERN_ERR, "invalid boot record signature"); 437 ret = -EINVAL; 438 goto free_bh; 439 } 440 441 442 /* check logical sector size */ 443 p_pbr = exfat_read_pbr_with_logical_sector(sb); 444 if (!p_pbr) { 445 ret = -EIO; 446 goto free_bh; 447 } 448 449 /* 450 * res_zero field must be filled with zero to prevent mounting 451 * from FAT volume. 452 */ 453 if (memchr_inv(p_pbr->bpb.f64.res_zero, 0, 454 sizeof(p_pbr->bpb.f64.res_zero))) { 455 ret = -EINVAL; 456 goto free_bh; 457 } 458 459 p_bpb = (struct pbr64 *)p_pbr; 460 if (!p_bpb->bsx.num_fats) { 461 exfat_msg(sb, KERN_ERR, "bogus number of FAT structure"); 462 ret = -EINVAL; 463 goto free_bh; 464 } 465 466 sbi->sect_per_clus = 1 << p_bpb->bsx.sect_per_clus_bits; 467 sbi->sect_per_clus_bits = p_bpb->bsx.sect_per_clus_bits; 468 sbi->cluster_size_bits = sbi->sect_per_clus_bits + sb->s_blocksize_bits; 469 sbi->cluster_size = 1 << sbi->cluster_size_bits; 470 sbi->num_FAT_sectors = le32_to_cpu(p_bpb->bsx.fat_length); 471 sbi->FAT1_start_sector = le32_to_cpu(p_bpb->bsx.fat_offset); 472 sbi->FAT2_start_sector = p_bpb->bsx.num_fats == 1 ? 473 sbi->FAT1_start_sector : 474 sbi->FAT1_start_sector + sbi->num_FAT_sectors; 475 sbi->data_start_sector = le32_to_cpu(p_bpb->bsx.clu_offset); 476 sbi->num_sectors = le64_to_cpu(p_bpb->bsx.vol_length); 477 /* because the cluster index starts with 2 */ 478 sbi->num_clusters = le32_to_cpu(p_bpb->bsx.clu_count) + 479 EXFAT_RESERVED_CLUSTERS; 480 481 sbi->root_dir = le32_to_cpu(p_bpb->bsx.root_cluster); 482 sbi->dentries_per_clu = 1 << 483 (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 484 485 sbi->vol_flag = le16_to_cpu(p_bpb->bsx.vol_flags); 486 sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; 487 sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED; 488 489 if (le16_to_cpu(p_bpb->bsx.vol_flags) & VOL_DIRTY) { 490 sbi->vol_flag |= VOL_DIRTY; 491 exfat_msg(sb, KERN_WARNING, 492 "Volume was not properly unmounted. Some data may be corrupt. Please run fsck."); 493 } 494 495 /* exFAT file size is limited by a disk volume size */ 496 sb->s_maxbytes = (u64)(sbi->num_clusters - EXFAT_RESERVED_CLUSTERS) << 497 sbi->cluster_size_bits; 498 499 ret = exfat_create_upcase_table(sb); 500 if (ret) { 501 exfat_msg(sb, KERN_ERR, "failed to load upcase table"); 502 goto free_bh; 503 } 504 505 ret = exfat_load_bitmap(sb); 506 if (ret) { 507 exfat_msg(sb, KERN_ERR, "failed to load alloc-bitmap"); 508 goto free_upcase_table; 509 } 510 511 ret = exfat_count_used_clusters(sb, &sbi->used_clusters); 512 if (ret) { 513 exfat_msg(sb, KERN_ERR, "failed to scan clusters"); 514 goto free_alloc_bitmap; 515 } 516 517 return 0; 518 519 free_alloc_bitmap: 520 exfat_free_bitmap(sbi); 521 free_upcase_table: 522 exfat_free_upcase_table(sbi); 523 free_bh: 524 brelse(sbi->pbr_bh); 525 return ret; 526 } 527 528 static int exfat_fill_super(struct super_block *sb, struct fs_context *fc) 529 { 530 struct exfat_sb_info *sbi = sb->s_fs_info; 531 struct exfat_mount_options *opts = &sbi->options; 532 struct inode *root_inode; 533 int err; 534 535 if (opts->allow_utime == (unsigned short)-1) 536 opts->allow_utime = ~opts->fs_dmask & 0022; 537 538 if (opts->discard) { 539 struct request_queue *q = bdev_get_queue(sb->s_bdev); 540 541 if (!blk_queue_discard(q)) { 542 exfat_msg(sb, KERN_WARNING, 543 "mounting with \"discard\" option, but the device does not support discard"); 544 opts->discard = 0; 545 } 546 } 547 548 sb->s_flags |= SB_NODIRATIME; 549 sb->s_magic = EXFAT_SUPER_MAGIC; 550 sb->s_op = &exfat_sops; 551 552 sb->s_time_gran = 10 * NSEC_PER_MSEC; 553 sb->s_time_min = EXFAT_MIN_TIMESTAMP_SECS; 554 sb->s_time_max = EXFAT_MAX_TIMESTAMP_SECS; 555 556 err = __exfat_fill_super(sb); 557 if (err) { 558 exfat_msg(sb, KERN_ERR, "failed to recognize exfat type"); 559 goto check_nls_io; 560 } 561 562 /* set up enough so that it can read an inode */ 563 exfat_hash_init(sb); 564 565 if (!strcmp(sbi->options.iocharset, "utf8")) 566 opts->utf8 = 1; 567 else { 568 sbi->nls_io = load_nls(sbi->options.iocharset); 569 if (!sbi->nls_io) { 570 exfat_msg(sb, KERN_ERR, "IO charset %s not found", 571 sbi->options.iocharset); 572 err = -EINVAL; 573 goto free_table; 574 } 575 } 576 577 if (sbi->options.utf8) 578 sb->s_d_op = &exfat_utf8_dentry_ops; 579 else 580 sb->s_d_op = &exfat_dentry_ops; 581 582 root_inode = new_inode(sb); 583 if (!root_inode) { 584 exfat_msg(sb, KERN_ERR, "failed to allocate root inode."); 585 err = -ENOMEM; 586 goto free_table; 587 } 588 589 root_inode->i_ino = EXFAT_ROOT_INO; 590 inode_set_iversion(root_inode, 1); 591 err = exfat_read_root(root_inode); 592 if (err) { 593 exfat_msg(sb, KERN_ERR, "failed to initialize root inode."); 594 goto put_inode; 595 } 596 597 exfat_hash_inode(root_inode, EXFAT_I(root_inode)->i_pos); 598 insert_inode_hash(root_inode); 599 600 sb->s_root = d_make_root(root_inode); 601 if (!sb->s_root) { 602 exfat_msg(sb, KERN_ERR, "failed to get the root dentry"); 603 err = -ENOMEM; 604 goto put_inode; 605 } 606 607 return 0; 608 609 put_inode: 610 iput(root_inode); 611 sb->s_root = NULL; 612 613 free_table: 614 exfat_free_upcase_table(sbi); 615 exfat_free_bitmap(sbi); 616 brelse(sbi->pbr_bh); 617 618 check_nls_io: 619 unload_nls(sbi->nls_io); 620 exfat_free_iocharset(sbi); 621 sb->s_fs_info = NULL; 622 kfree(sbi); 623 return err; 624 } 625 626 static int exfat_get_tree(struct fs_context *fc) 627 { 628 return get_tree_bdev(fc, exfat_fill_super); 629 } 630 631 static void exfat_free(struct fs_context *fc) 632 { 633 kfree(fc->s_fs_info); 634 } 635 636 static const struct fs_context_operations exfat_context_ops = { 637 .parse_param = exfat_parse_param, 638 .get_tree = exfat_get_tree, 639 .free = exfat_free, 640 }; 641 642 static int exfat_init_fs_context(struct fs_context *fc) 643 { 644 struct exfat_sb_info *sbi; 645 646 sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); 647 if (!sbi) 648 return -ENOMEM; 649 650 mutex_init(&sbi->s_lock); 651 ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 652 DEFAULT_RATELIMIT_BURST); 653 654 sbi->options.fs_uid = current_uid(); 655 sbi->options.fs_gid = current_gid(); 656 sbi->options.fs_fmask = current->fs->umask; 657 sbi->options.fs_dmask = current->fs->umask; 658 sbi->options.allow_utime = -1; 659 sbi->options.iocharset = exfat_default_iocharset; 660 sbi->options.errors = EXFAT_ERRORS_RO; 661 662 fc->s_fs_info = sbi; 663 fc->ops = &exfat_context_ops; 664 return 0; 665 } 666 667 static struct file_system_type exfat_fs_type = { 668 .owner = THIS_MODULE, 669 .name = "exfat", 670 .init_fs_context = exfat_init_fs_context, 671 .parameters = exfat_parameters, 672 .kill_sb = kill_block_super, 673 .fs_flags = FS_REQUIRES_DEV, 674 }; 675 676 static void exfat_inode_init_once(void *foo) 677 { 678 struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; 679 680 INIT_HLIST_NODE(&ei->i_hash_fat); 681 inode_init_once(&ei->vfs_inode); 682 } 683 684 static int __init init_exfat_fs(void) 685 { 686 int err; 687 688 err = exfat_cache_init(); 689 if (err) 690 return err; 691 692 exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", 693 sizeof(struct exfat_inode_info), 694 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 695 exfat_inode_init_once); 696 if (!exfat_inode_cachep) { 697 err = -ENOMEM; 698 goto shutdown_cache; 699 } 700 701 err = register_filesystem(&exfat_fs_type); 702 if (err) 703 goto destroy_cache; 704 705 return 0; 706 707 destroy_cache: 708 kmem_cache_destroy(exfat_inode_cachep); 709 shutdown_cache: 710 exfat_cache_shutdown(); 711 return err; 712 } 713 714 static void __exit exit_exfat_fs(void) 715 { 716 /* 717 * Make sure all delayed rcu free inodes are flushed before we 718 * destroy cache. 719 */ 720 rcu_barrier(); 721 kmem_cache_destroy(exfat_inode_cachep); 722 unregister_filesystem(&exfat_fs_type); 723 exfat_cache_shutdown(); 724 } 725 726 module_init(init_exfat_fs); 727 module_exit(exit_exfat_fs); 728 729 MODULE_ALIAS_FS("exfat"); 730 MODULE_LICENSE("GPL"); 731 MODULE_DESCRIPTION("exFAT filesystem support"); 732 MODULE_AUTHOR("Samsung Electronics Co., Ltd."); 733