1 /* 2 * fs/f2fs/super.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/fs.h> 14 #include <linux/statfs.h> 15 #include <linux/buffer_head.h> 16 #include <linux/backing-dev.h> 17 #include <linux/kthread.h> 18 #include <linux/parser.h> 19 #include <linux/mount.h> 20 #include <linux/seq_file.h> 21 #include <linux/proc_fs.h> 22 #include <linux/random.h> 23 #include <linux/exportfs.h> 24 #include <linux/blkdev.h> 25 #include <linux/f2fs_fs.h> 26 #include <linux/sysfs.h> 27 28 #include "f2fs.h" 29 #include "node.h" 30 #include "segment.h" 31 #include "xattr.h" 32 #include "gc.h" 33 #include "trace.h" 34 35 #define CREATE_TRACE_POINTS 36 #include <trace/events/f2fs.h> 37 38 static struct proc_dir_entry *f2fs_proc_root; 39 static struct kmem_cache *f2fs_inode_cachep; 40 static struct kset *f2fs_kset; 41 42 enum { 43 Opt_gc_background, 44 Opt_disable_roll_forward, 45 Opt_norecovery, 46 Opt_discard, 47 Opt_noheap, 48 Opt_user_xattr, 49 Opt_nouser_xattr, 50 Opt_acl, 51 Opt_noacl, 52 Opt_active_logs, 53 Opt_disable_ext_identify, 54 Opt_inline_xattr, 55 Opt_inline_data, 56 Opt_inline_dentry, 57 Opt_flush_merge, 58 Opt_nobarrier, 59 Opt_fastboot, 60 Opt_err, 61 }; 62 63 static match_table_t f2fs_tokens = { 64 {Opt_gc_background, "background_gc=%s"}, 65 {Opt_disable_roll_forward, "disable_roll_forward"}, 66 {Opt_norecovery, "norecovery"}, 67 {Opt_discard, "discard"}, 68 {Opt_noheap, "no_heap"}, 69 {Opt_user_xattr, "user_xattr"}, 70 {Opt_nouser_xattr, "nouser_xattr"}, 71 {Opt_acl, "acl"}, 72 {Opt_noacl, "noacl"}, 73 {Opt_active_logs, "active_logs=%u"}, 74 {Opt_disable_ext_identify, "disable_ext_identify"}, 75 {Opt_inline_xattr, "inline_xattr"}, 76 {Opt_inline_data, "inline_data"}, 77 {Opt_inline_dentry, "inline_dentry"}, 78 {Opt_flush_merge, "flush_merge"}, 79 {Opt_nobarrier, "nobarrier"}, 80 {Opt_fastboot, "fastboot"}, 81 {Opt_err, NULL}, 82 }; 83 84 /* Sysfs support for f2fs */ 85 enum { 86 GC_THREAD, /* struct f2fs_gc_thread */ 87 SM_INFO, /* struct f2fs_sm_info */ 88 NM_INFO, /* struct f2fs_nm_info */ 89 F2FS_SBI, /* struct f2fs_sb_info */ 90 }; 91 92 struct f2fs_attr { 93 struct attribute attr; 94 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *); 95 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *, 96 const char *, size_t); 97 int struct_type; 98 int offset; 99 }; 100 101 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type) 102 { 103 if (struct_type == GC_THREAD) 104 return (unsigned char *)sbi->gc_thread; 105 else if (struct_type == SM_INFO) 106 return (unsigned char *)SM_I(sbi); 107 else if (struct_type == NM_INFO) 108 return (unsigned char *)NM_I(sbi); 109 else if (struct_type == F2FS_SBI) 110 return (unsigned char *)sbi; 111 return NULL; 112 } 113 114 static ssize_t f2fs_sbi_show(struct f2fs_attr *a, 115 struct f2fs_sb_info *sbi, char *buf) 116 { 117 unsigned char *ptr = NULL; 118 unsigned int *ui; 119 120 ptr = __struct_ptr(sbi, a->struct_type); 121 if (!ptr) 122 return -EINVAL; 123 124 ui = (unsigned int *)(ptr + a->offset); 125 126 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 127 } 128 129 static ssize_t f2fs_sbi_store(struct f2fs_attr *a, 130 struct f2fs_sb_info *sbi, 131 const char *buf, size_t count) 132 { 133 unsigned char *ptr; 134 unsigned long t; 135 unsigned int *ui; 136 ssize_t ret; 137 138 ptr = __struct_ptr(sbi, a->struct_type); 139 if (!ptr) 140 return -EINVAL; 141 142 ui = (unsigned int *)(ptr + a->offset); 143 144 ret = kstrtoul(skip_spaces(buf), 0, &t); 145 if (ret < 0) 146 return ret; 147 *ui = t; 148 return count; 149 } 150 151 static ssize_t f2fs_attr_show(struct kobject *kobj, 152 struct attribute *attr, char *buf) 153 { 154 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 155 s_kobj); 156 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 157 158 return a->show ? a->show(a, sbi, buf) : 0; 159 } 160 161 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr, 162 const char *buf, size_t len) 163 { 164 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 165 s_kobj); 166 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 167 168 return a->store ? a->store(a, sbi, buf, len) : 0; 169 } 170 171 static void f2fs_sb_release(struct kobject *kobj) 172 { 173 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 174 s_kobj); 175 complete(&sbi->s_kobj_unregister); 176 } 177 178 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \ 179 static struct f2fs_attr f2fs_attr_##_name = { \ 180 .attr = {.name = __stringify(_name), .mode = _mode }, \ 181 .show = _show, \ 182 .store = _store, \ 183 .struct_type = _struct_type, \ 184 .offset = _offset \ 185 } 186 187 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \ 188 F2FS_ATTR_OFFSET(struct_type, name, 0644, \ 189 f2fs_sbi_show, f2fs_sbi_store, \ 190 offsetof(struct struct_name, elname)) 191 192 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); 193 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); 194 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); 195 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); 196 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); 197 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); 198 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); 199 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util); 201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks); 202 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh); 203 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search); 204 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level); 205 206 #define ATTR_LIST(name) (&f2fs_attr_##name.attr) 207 static struct attribute *f2fs_attrs[] = { 208 ATTR_LIST(gc_min_sleep_time), 209 ATTR_LIST(gc_max_sleep_time), 210 ATTR_LIST(gc_no_gc_sleep_time), 211 ATTR_LIST(gc_idle), 212 ATTR_LIST(reclaim_segments), 213 ATTR_LIST(max_small_discards), 214 ATTR_LIST(batched_trim_sections), 215 ATTR_LIST(ipu_policy), 216 ATTR_LIST(min_ipu_util), 217 ATTR_LIST(min_fsync_blocks), 218 ATTR_LIST(max_victim_search), 219 ATTR_LIST(dir_level), 220 ATTR_LIST(ram_thresh), 221 NULL, 222 }; 223 224 static const struct sysfs_ops f2fs_attr_ops = { 225 .show = f2fs_attr_show, 226 .store = f2fs_attr_store, 227 }; 228 229 static struct kobj_type f2fs_ktype = { 230 .default_attrs = f2fs_attrs, 231 .sysfs_ops = &f2fs_attr_ops, 232 .release = f2fs_sb_release, 233 }; 234 235 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) 236 { 237 struct va_format vaf; 238 va_list args; 239 240 va_start(args, fmt); 241 vaf.fmt = fmt; 242 vaf.va = &args; 243 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); 244 va_end(args); 245 } 246 247 static void init_once(void *foo) 248 { 249 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; 250 251 inode_init_once(&fi->vfs_inode); 252 } 253 254 static int parse_options(struct super_block *sb, char *options) 255 { 256 struct f2fs_sb_info *sbi = F2FS_SB(sb); 257 substring_t args[MAX_OPT_ARGS]; 258 char *p, *name; 259 int arg = 0; 260 261 if (!options) 262 return 0; 263 264 while ((p = strsep(&options, ",")) != NULL) { 265 int token; 266 if (!*p) 267 continue; 268 /* 269 * Initialize args struct so we know whether arg was 270 * found; some options take optional arguments. 271 */ 272 args[0].to = args[0].from = NULL; 273 token = match_token(p, f2fs_tokens, args); 274 275 switch (token) { 276 case Opt_gc_background: 277 name = match_strdup(&args[0]); 278 279 if (!name) 280 return -ENOMEM; 281 if (strlen(name) == 2 && !strncmp(name, "on", 2)) 282 set_opt(sbi, BG_GC); 283 else if (strlen(name) == 3 && !strncmp(name, "off", 3)) 284 clear_opt(sbi, BG_GC); 285 else { 286 kfree(name); 287 return -EINVAL; 288 } 289 kfree(name); 290 break; 291 case Opt_disable_roll_forward: 292 set_opt(sbi, DISABLE_ROLL_FORWARD); 293 break; 294 case Opt_norecovery: 295 /* this option mounts f2fs with ro */ 296 set_opt(sbi, DISABLE_ROLL_FORWARD); 297 if (!f2fs_readonly(sb)) 298 return -EINVAL; 299 break; 300 case Opt_discard: 301 set_opt(sbi, DISCARD); 302 break; 303 case Opt_noheap: 304 set_opt(sbi, NOHEAP); 305 break; 306 #ifdef CONFIG_F2FS_FS_XATTR 307 case Opt_user_xattr: 308 set_opt(sbi, XATTR_USER); 309 break; 310 case Opt_nouser_xattr: 311 clear_opt(sbi, XATTR_USER); 312 break; 313 case Opt_inline_xattr: 314 set_opt(sbi, INLINE_XATTR); 315 break; 316 #else 317 case Opt_user_xattr: 318 f2fs_msg(sb, KERN_INFO, 319 "user_xattr options not supported"); 320 break; 321 case Opt_nouser_xattr: 322 f2fs_msg(sb, KERN_INFO, 323 "nouser_xattr options not supported"); 324 break; 325 case Opt_inline_xattr: 326 f2fs_msg(sb, KERN_INFO, 327 "inline_xattr options not supported"); 328 break; 329 #endif 330 #ifdef CONFIG_F2FS_FS_POSIX_ACL 331 case Opt_acl: 332 set_opt(sbi, POSIX_ACL); 333 break; 334 case Opt_noacl: 335 clear_opt(sbi, POSIX_ACL); 336 break; 337 #else 338 case Opt_acl: 339 f2fs_msg(sb, KERN_INFO, "acl options not supported"); 340 break; 341 case Opt_noacl: 342 f2fs_msg(sb, KERN_INFO, "noacl options not supported"); 343 break; 344 #endif 345 case Opt_active_logs: 346 if (args->from && match_int(args, &arg)) 347 return -EINVAL; 348 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) 349 return -EINVAL; 350 sbi->active_logs = arg; 351 break; 352 case Opt_disable_ext_identify: 353 set_opt(sbi, DISABLE_EXT_IDENTIFY); 354 break; 355 case Opt_inline_data: 356 set_opt(sbi, INLINE_DATA); 357 break; 358 case Opt_inline_dentry: 359 set_opt(sbi, INLINE_DENTRY); 360 break; 361 case Opt_flush_merge: 362 set_opt(sbi, FLUSH_MERGE); 363 break; 364 case Opt_nobarrier: 365 set_opt(sbi, NOBARRIER); 366 break; 367 case Opt_fastboot: 368 set_opt(sbi, FASTBOOT); 369 break; 370 default: 371 f2fs_msg(sb, KERN_ERR, 372 "Unrecognized mount option \"%s\" or missing value", 373 p); 374 return -EINVAL; 375 } 376 } 377 return 0; 378 } 379 380 static struct inode *f2fs_alloc_inode(struct super_block *sb) 381 { 382 struct f2fs_inode_info *fi; 383 384 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO); 385 if (!fi) 386 return NULL; 387 388 init_once((void *) fi); 389 390 /* Initialize f2fs-specific inode info */ 391 fi->vfs_inode.i_version = 1; 392 atomic_set(&fi->dirty_pages, 0); 393 fi->i_current_depth = 1; 394 fi->i_advise = 0; 395 rwlock_init(&fi->ext.ext_lock); 396 init_rwsem(&fi->i_sem); 397 INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS); 398 INIT_LIST_HEAD(&fi->inmem_pages); 399 mutex_init(&fi->inmem_lock); 400 401 set_inode_flag(fi, FI_NEW_INODE); 402 403 if (test_opt(F2FS_SB(sb), INLINE_XATTR)) 404 set_inode_flag(fi, FI_INLINE_XATTR); 405 406 /* Will be used by directory only */ 407 fi->i_dir_level = F2FS_SB(sb)->dir_level; 408 409 return &fi->vfs_inode; 410 } 411 412 static int f2fs_drop_inode(struct inode *inode) 413 { 414 /* 415 * This is to avoid a deadlock condition like below. 416 * writeback_single_inode(inode) 417 * - f2fs_write_data_page 418 * - f2fs_gc -> iput -> evict 419 * - inode_wait_for_writeback(inode) 420 */ 421 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) 422 return 0; 423 return generic_drop_inode(inode); 424 } 425 426 /* 427 * f2fs_dirty_inode() is called from __mark_inode_dirty() 428 * 429 * We should call set_dirty_inode to write the dirty inode through write_inode. 430 */ 431 static void f2fs_dirty_inode(struct inode *inode, int flags) 432 { 433 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE); 434 } 435 436 static void f2fs_i_callback(struct rcu_head *head) 437 { 438 struct inode *inode = container_of(head, struct inode, i_rcu); 439 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); 440 } 441 442 static void f2fs_destroy_inode(struct inode *inode) 443 { 444 call_rcu(&inode->i_rcu, f2fs_i_callback); 445 } 446 447 static void f2fs_put_super(struct super_block *sb) 448 { 449 struct f2fs_sb_info *sbi = F2FS_SB(sb); 450 451 if (sbi->s_proc) { 452 remove_proc_entry("segment_info", sbi->s_proc); 453 remove_proc_entry(sb->s_id, f2fs_proc_root); 454 } 455 kobject_del(&sbi->s_kobj); 456 457 f2fs_destroy_stats(sbi); 458 stop_gc_thread(sbi); 459 460 /* 461 * We don't need to do checkpoint when superblock is clean. 462 * But, the previous checkpoint was not done by umount, it needs to do 463 * clean checkpoint again. 464 */ 465 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) || 466 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) { 467 struct cp_control cpc = { 468 .reason = CP_UMOUNT, 469 }; 470 write_checkpoint(sbi, &cpc); 471 } 472 473 /* 474 * normally superblock is clean, so we need to release this. 475 * In addition, EIO will skip do checkpoint, we need this as well. 476 */ 477 release_dirty_inode(sbi); 478 release_discard_addrs(sbi); 479 480 iput(sbi->node_inode); 481 iput(sbi->meta_inode); 482 483 /* destroy f2fs internal modules */ 484 destroy_node_manager(sbi); 485 destroy_segment_manager(sbi); 486 487 kfree(sbi->ckpt); 488 kobject_put(&sbi->s_kobj); 489 wait_for_completion(&sbi->s_kobj_unregister); 490 491 sb->s_fs_info = NULL; 492 brelse(sbi->raw_super_buf); 493 kfree(sbi); 494 } 495 496 int f2fs_sync_fs(struct super_block *sb, int sync) 497 { 498 struct f2fs_sb_info *sbi = F2FS_SB(sb); 499 500 trace_f2fs_sync_fs(sb, sync); 501 502 if (sync) { 503 struct cp_control cpc; 504 505 cpc.reason = __get_cp_reason(sbi); 506 507 mutex_lock(&sbi->gc_mutex); 508 write_checkpoint(sbi, &cpc); 509 mutex_unlock(&sbi->gc_mutex); 510 } else { 511 f2fs_balance_fs(sbi); 512 } 513 f2fs_trace_ios(NULL, NULL, 1); 514 515 return 0; 516 } 517 518 static int f2fs_freeze(struct super_block *sb) 519 { 520 int err; 521 522 if (f2fs_readonly(sb)) 523 return 0; 524 525 err = f2fs_sync_fs(sb, 1); 526 return err; 527 } 528 529 static int f2fs_unfreeze(struct super_block *sb) 530 { 531 return 0; 532 } 533 534 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) 535 { 536 struct super_block *sb = dentry->d_sb; 537 struct f2fs_sb_info *sbi = F2FS_SB(sb); 538 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 539 block_t total_count, user_block_count, start_count, ovp_count; 540 541 total_count = le64_to_cpu(sbi->raw_super->block_count); 542 user_block_count = sbi->user_block_count; 543 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); 544 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; 545 buf->f_type = F2FS_SUPER_MAGIC; 546 buf->f_bsize = sbi->blocksize; 547 548 buf->f_blocks = total_count - start_count; 549 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; 550 buf->f_bavail = user_block_count - valid_user_blocks(sbi); 551 552 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; 553 buf->f_ffree = buf->f_files - valid_inode_count(sbi); 554 555 buf->f_namelen = F2FS_NAME_LEN; 556 buf->f_fsid.val[0] = (u32)id; 557 buf->f_fsid.val[1] = (u32)(id >> 32); 558 559 return 0; 560 } 561 562 static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 563 { 564 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); 565 566 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) 567 seq_printf(seq, ",background_gc=%s", "on"); 568 else 569 seq_printf(seq, ",background_gc=%s", "off"); 570 if (test_opt(sbi, DISABLE_ROLL_FORWARD)) 571 seq_puts(seq, ",disable_roll_forward"); 572 if (test_opt(sbi, DISCARD)) 573 seq_puts(seq, ",discard"); 574 if (test_opt(sbi, NOHEAP)) 575 seq_puts(seq, ",no_heap_alloc"); 576 #ifdef CONFIG_F2FS_FS_XATTR 577 if (test_opt(sbi, XATTR_USER)) 578 seq_puts(seq, ",user_xattr"); 579 else 580 seq_puts(seq, ",nouser_xattr"); 581 if (test_opt(sbi, INLINE_XATTR)) 582 seq_puts(seq, ",inline_xattr"); 583 #endif 584 #ifdef CONFIG_F2FS_FS_POSIX_ACL 585 if (test_opt(sbi, POSIX_ACL)) 586 seq_puts(seq, ",acl"); 587 else 588 seq_puts(seq, ",noacl"); 589 #endif 590 if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) 591 seq_puts(seq, ",disable_ext_identify"); 592 if (test_opt(sbi, INLINE_DATA)) 593 seq_puts(seq, ",inline_data"); 594 if (test_opt(sbi, INLINE_DENTRY)) 595 seq_puts(seq, ",inline_dentry"); 596 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE)) 597 seq_puts(seq, ",flush_merge"); 598 if (test_opt(sbi, NOBARRIER)) 599 seq_puts(seq, ",nobarrier"); 600 if (test_opt(sbi, FASTBOOT)) 601 seq_puts(seq, ",fastboot"); 602 seq_printf(seq, ",active_logs=%u", sbi->active_logs); 603 604 return 0; 605 } 606 607 static int segment_info_seq_show(struct seq_file *seq, void *offset) 608 { 609 struct super_block *sb = seq->private; 610 struct f2fs_sb_info *sbi = F2FS_SB(sb); 611 unsigned int total_segs = 612 le32_to_cpu(sbi->raw_super->segment_count_main); 613 int i; 614 615 seq_puts(seq, "format: segment_type|valid_blocks\n" 616 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n"); 617 618 for (i = 0; i < total_segs; i++) { 619 struct seg_entry *se = get_seg_entry(sbi, i); 620 621 if ((i % 10) == 0) 622 seq_printf(seq, "%-5d", i); 623 seq_printf(seq, "%d|%-3u", se->type, 624 get_valid_blocks(sbi, i, 1)); 625 if ((i % 10) == 9 || i == (total_segs - 1)) 626 seq_putc(seq, '\n'); 627 else 628 seq_putc(seq, ' '); 629 } 630 631 return 0; 632 } 633 634 static int segment_info_open_fs(struct inode *inode, struct file *file) 635 { 636 return single_open(file, segment_info_seq_show, PDE_DATA(inode)); 637 } 638 639 static const struct file_operations f2fs_seq_segment_info_fops = { 640 .owner = THIS_MODULE, 641 .open = segment_info_open_fs, 642 .read = seq_read, 643 .llseek = seq_lseek, 644 .release = single_release, 645 }; 646 647 static int f2fs_remount(struct super_block *sb, int *flags, char *data) 648 { 649 struct f2fs_sb_info *sbi = F2FS_SB(sb); 650 struct f2fs_mount_info org_mount_opt; 651 int err, active_logs; 652 bool need_restart_gc = false; 653 bool need_stop_gc = false; 654 655 sync_filesystem(sb); 656 657 /* 658 * Save the old mount options in case we 659 * need to restore them. 660 */ 661 org_mount_opt = sbi->mount_opt; 662 active_logs = sbi->active_logs; 663 664 sbi->mount_opt.opt = 0; 665 sbi->active_logs = NR_CURSEG_TYPE; 666 667 /* parse mount options */ 668 err = parse_options(sb, data); 669 if (err) 670 goto restore_opts; 671 672 /* 673 * Previous and new state of filesystem is RO, 674 * so skip checking GC and FLUSH_MERGE conditions. 675 */ 676 if (f2fs_readonly(sb) && (*flags & MS_RDONLY)) 677 goto skip; 678 679 /* 680 * We stop the GC thread if FS is mounted as RO 681 * or if background_gc = off is passed in mount 682 * option. Also sync the filesystem. 683 */ 684 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) { 685 if (sbi->gc_thread) { 686 stop_gc_thread(sbi); 687 f2fs_sync_fs(sb, 1); 688 need_restart_gc = true; 689 } 690 } else if (!sbi->gc_thread) { 691 err = start_gc_thread(sbi); 692 if (err) 693 goto restore_opts; 694 need_stop_gc = true; 695 } 696 697 /* 698 * We stop issue flush thread if FS is mounted as RO 699 * or if flush_merge is not passed in mount option. 700 */ 701 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) { 702 destroy_flush_cmd_control(sbi); 703 } else if (!SM_I(sbi)->cmd_control_info) { 704 err = create_flush_cmd_control(sbi); 705 if (err) 706 goto restore_gc; 707 } 708 skip: 709 /* Update the POSIXACL Flag */ 710 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 711 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 712 return 0; 713 restore_gc: 714 if (need_restart_gc) { 715 if (start_gc_thread(sbi)) 716 f2fs_msg(sbi->sb, KERN_WARNING, 717 "background gc thread has stopped"); 718 } else if (need_stop_gc) { 719 stop_gc_thread(sbi); 720 } 721 restore_opts: 722 sbi->mount_opt = org_mount_opt; 723 sbi->active_logs = active_logs; 724 return err; 725 } 726 727 static struct super_operations f2fs_sops = { 728 .alloc_inode = f2fs_alloc_inode, 729 .drop_inode = f2fs_drop_inode, 730 .destroy_inode = f2fs_destroy_inode, 731 .write_inode = f2fs_write_inode, 732 .dirty_inode = f2fs_dirty_inode, 733 .show_options = f2fs_show_options, 734 .evict_inode = f2fs_evict_inode, 735 .put_super = f2fs_put_super, 736 .sync_fs = f2fs_sync_fs, 737 .freeze_fs = f2fs_freeze, 738 .unfreeze_fs = f2fs_unfreeze, 739 .statfs = f2fs_statfs, 740 .remount_fs = f2fs_remount, 741 }; 742 743 static struct inode *f2fs_nfs_get_inode(struct super_block *sb, 744 u64 ino, u32 generation) 745 { 746 struct f2fs_sb_info *sbi = F2FS_SB(sb); 747 struct inode *inode; 748 749 if (check_nid_range(sbi, ino)) 750 return ERR_PTR(-ESTALE); 751 752 /* 753 * f2fs_iget isn't quite right if the inode is currently unallocated! 754 * However f2fs_iget currently does appropriate checks to handle stale 755 * inodes so everything is OK. 756 */ 757 inode = f2fs_iget(sb, ino); 758 if (IS_ERR(inode)) 759 return ERR_CAST(inode); 760 if (unlikely(generation && inode->i_generation != generation)) { 761 /* we didn't find the right inode.. */ 762 iput(inode); 763 return ERR_PTR(-ESTALE); 764 } 765 return inode; 766 } 767 768 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, 769 int fh_len, int fh_type) 770 { 771 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 772 f2fs_nfs_get_inode); 773 } 774 775 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, 776 int fh_len, int fh_type) 777 { 778 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 779 f2fs_nfs_get_inode); 780 } 781 782 static const struct export_operations f2fs_export_ops = { 783 .fh_to_dentry = f2fs_fh_to_dentry, 784 .fh_to_parent = f2fs_fh_to_parent, 785 .get_parent = f2fs_get_parent, 786 }; 787 788 static loff_t max_file_size(unsigned bits) 789 { 790 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS); 791 loff_t leaf_count = ADDRS_PER_BLOCK; 792 793 /* two direct node blocks */ 794 result += (leaf_count * 2); 795 796 /* two indirect node blocks */ 797 leaf_count *= NIDS_PER_BLOCK; 798 result += (leaf_count * 2); 799 800 /* one double indirect node block */ 801 leaf_count *= NIDS_PER_BLOCK; 802 result += leaf_count; 803 804 result <<= bits; 805 return result; 806 } 807 808 static int sanity_check_raw_super(struct super_block *sb, 809 struct f2fs_super_block *raw_super) 810 { 811 unsigned int blocksize; 812 813 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { 814 f2fs_msg(sb, KERN_INFO, 815 "Magic Mismatch, valid(0x%x) - read(0x%x)", 816 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); 817 return 1; 818 } 819 820 /* Currently, support only 4KB page cache size */ 821 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { 822 f2fs_msg(sb, KERN_INFO, 823 "Invalid page_cache_size (%lu), supports only 4KB\n", 824 PAGE_CACHE_SIZE); 825 return 1; 826 } 827 828 /* Currently, support only 4KB block size */ 829 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); 830 if (blocksize != F2FS_BLKSIZE) { 831 f2fs_msg(sb, KERN_INFO, 832 "Invalid blocksize (%u), supports only 4KB\n", 833 blocksize); 834 return 1; 835 } 836 837 /* Currently, support 512/1024/2048/4096 bytes sector size */ 838 if (le32_to_cpu(raw_super->log_sectorsize) > 839 F2FS_MAX_LOG_SECTOR_SIZE || 840 le32_to_cpu(raw_super->log_sectorsize) < 841 F2FS_MIN_LOG_SECTOR_SIZE) { 842 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)", 843 le32_to_cpu(raw_super->log_sectorsize)); 844 return 1; 845 } 846 if (le32_to_cpu(raw_super->log_sectors_per_block) + 847 le32_to_cpu(raw_super->log_sectorsize) != 848 F2FS_MAX_LOG_SECTOR_SIZE) { 849 f2fs_msg(sb, KERN_INFO, 850 "Invalid log sectors per block(%u) log sectorsize(%u)", 851 le32_to_cpu(raw_super->log_sectors_per_block), 852 le32_to_cpu(raw_super->log_sectorsize)); 853 return 1; 854 } 855 return 0; 856 } 857 858 static int sanity_check_ckpt(struct f2fs_sb_info *sbi) 859 { 860 unsigned int total, fsmeta; 861 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); 862 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 863 864 total = le32_to_cpu(raw_super->segment_count); 865 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); 866 fsmeta += le32_to_cpu(raw_super->segment_count_sit); 867 fsmeta += le32_to_cpu(raw_super->segment_count_nat); 868 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); 869 fsmeta += le32_to_cpu(raw_super->segment_count_ssa); 870 871 if (unlikely(fsmeta >= total)) 872 return 1; 873 874 if (unlikely(f2fs_cp_error(sbi))) { 875 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); 876 return 1; 877 } 878 return 0; 879 } 880 881 static void init_sb_info(struct f2fs_sb_info *sbi) 882 { 883 struct f2fs_super_block *raw_super = sbi->raw_super; 884 int i; 885 886 sbi->log_sectors_per_block = 887 le32_to_cpu(raw_super->log_sectors_per_block); 888 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); 889 sbi->blocksize = 1 << sbi->log_blocksize; 890 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 891 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; 892 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); 893 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); 894 sbi->total_sections = le32_to_cpu(raw_super->section_count); 895 sbi->total_node_count = 896 (le32_to_cpu(raw_super->segment_count_nat) / 2) 897 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; 898 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); 899 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); 900 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); 901 sbi->cur_victim_sec = NULL_SECNO; 902 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH; 903 904 for (i = 0; i < NR_COUNT_TYPE; i++) 905 atomic_set(&sbi->nr_pages[i], 0); 906 907 sbi->dir_level = DEF_DIR_LEVEL; 908 clear_sbi_flag(sbi, SBI_NEED_FSCK); 909 } 910 911 /* 912 * Read f2fs raw super block. 913 * Because we have two copies of super block, so read the first one at first, 914 * if the first one is invalid, move to read the second one. 915 */ 916 static int read_raw_super_block(struct super_block *sb, 917 struct f2fs_super_block **raw_super, 918 struct buffer_head **raw_super_buf) 919 { 920 int block = 0; 921 922 retry: 923 *raw_super_buf = sb_bread(sb, block); 924 if (!*raw_super_buf) { 925 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock", 926 block + 1); 927 if (block == 0) { 928 block++; 929 goto retry; 930 } else { 931 return -EIO; 932 } 933 } 934 935 *raw_super = (struct f2fs_super_block *) 936 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET); 937 938 /* sanity checking of raw super */ 939 if (sanity_check_raw_super(sb, *raw_super)) { 940 brelse(*raw_super_buf); 941 f2fs_msg(sb, KERN_ERR, 942 "Can't find valid F2FS filesystem in %dth superblock", 943 block + 1); 944 if (block == 0) { 945 block++; 946 goto retry; 947 } else { 948 return -EINVAL; 949 } 950 } 951 952 return 0; 953 } 954 955 static int f2fs_fill_super(struct super_block *sb, void *data, int silent) 956 { 957 struct f2fs_sb_info *sbi; 958 struct f2fs_super_block *raw_super = NULL; 959 struct buffer_head *raw_super_buf; 960 struct inode *root; 961 long err = -EINVAL; 962 bool retry = true; 963 char *options = NULL; 964 int i; 965 966 try_onemore: 967 /* allocate memory for f2fs-specific super block info */ 968 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); 969 if (!sbi) 970 return -ENOMEM; 971 972 /* set a block size */ 973 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) { 974 f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); 975 goto free_sbi; 976 } 977 978 err = read_raw_super_block(sb, &raw_super, &raw_super_buf); 979 if (err) 980 goto free_sbi; 981 982 sb->s_fs_info = sbi; 983 /* init some FS parameters */ 984 sbi->active_logs = NR_CURSEG_TYPE; 985 986 set_opt(sbi, BG_GC); 987 988 #ifdef CONFIG_F2FS_FS_XATTR 989 set_opt(sbi, XATTR_USER); 990 #endif 991 #ifdef CONFIG_F2FS_FS_POSIX_ACL 992 set_opt(sbi, POSIX_ACL); 993 #endif 994 /* parse mount options */ 995 options = kstrdup((const char *)data, GFP_KERNEL); 996 if (data && !options) { 997 err = -ENOMEM; 998 goto free_sb_buf; 999 } 1000 1001 err = parse_options(sb, options); 1002 if (err) 1003 goto free_options; 1004 1005 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); 1006 sb->s_max_links = F2FS_LINK_MAX; 1007 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1008 1009 sb->s_op = &f2fs_sops; 1010 sb->s_xattr = f2fs_xattr_handlers; 1011 sb->s_export_op = &f2fs_export_ops; 1012 sb->s_magic = F2FS_SUPER_MAGIC; 1013 sb->s_time_gran = 1; 1014 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1015 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 1016 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); 1017 1018 /* init f2fs-specific super block info */ 1019 sbi->sb = sb; 1020 sbi->raw_super = raw_super; 1021 sbi->raw_super_buf = raw_super_buf; 1022 mutex_init(&sbi->gc_mutex); 1023 mutex_init(&sbi->writepages); 1024 mutex_init(&sbi->cp_mutex); 1025 init_rwsem(&sbi->node_write); 1026 clear_sbi_flag(sbi, SBI_POR_DOING); 1027 spin_lock_init(&sbi->stat_lock); 1028 1029 init_rwsem(&sbi->read_io.io_rwsem); 1030 sbi->read_io.sbi = sbi; 1031 sbi->read_io.bio = NULL; 1032 for (i = 0; i < NR_PAGE_TYPE; i++) { 1033 init_rwsem(&sbi->write_io[i].io_rwsem); 1034 sbi->write_io[i].sbi = sbi; 1035 sbi->write_io[i].bio = NULL; 1036 } 1037 1038 init_rwsem(&sbi->cp_rwsem); 1039 init_waitqueue_head(&sbi->cp_wait); 1040 init_sb_info(sbi); 1041 1042 /* get an inode for meta space */ 1043 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); 1044 if (IS_ERR(sbi->meta_inode)) { 1045 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); 1046 err = PTR_ERR(sbi->meta_inode); 1047 goto free_options; 1048 } 1049 1050 err = get_valid_checkpoint(sbi); 1051 if (err) { 1052 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); 1053 goto free_meta_inode; 1054 } 1055 1056 /* sanity checking of checkpoint */ 1057 err = -EINVAL; 1058 if (sanity_check_ckpt(sbi)) { 1059 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint"); 1060 goto free_cp; 1061 } 1062 1063 sbi->total_valid_node_count = 1064 le32_to_cpu(sbi->ckpt->valid_node_count); 1065 sbi->total_valid_inode_count = 1066 le32_to_cpu(sbi->ckpt->valid_inode_count); 1067 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); 1068 sbi->total_valid_block_count = 1069 le64_to_cpu(sbi->ckpt->valid_block_count); 1070 sbi->last_valid_block_count = sbi->total_valid_block_count; 1071 sbi->alloc_valid_block_count = 0; 1072 INIT_LIST_HEAD(&sbi->dir_inode_list); 1073 spin_lock_init(&sbi->dir_inode_lock); 1074 1075 init_ino_entry_info(sbi); 1076 1077 /* setup f2fs internal modules */ 1078 err = build_segment_manager(sbi); 1079 if (err) { 1080 f2fs_msg(sb, KERN_ERR, 1081 "Failed to initialize F2FS segment manager"); 1082 goto free_sm; 1083 } 1084 err = build_node_manager(sbi); 1085 if (err) { 1086 f2fs_msg(sb, KERN_ERR, 1087 "Failed to initialize F2FS node manager"); 1088 goto free_nm; 1089 } 1090 1091 build_gc_manager(sbi); 1092 1093 /* get an inode for node space */ 1094 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); 1095 if (IS_ERR(sbi->node_inode)) { 1096 f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); 1097 err = PTR_ERR(sbi->node_inode); 1098 goto free_nm; 1099 } 1100 1101 /* if there are nt orphan nodes free them */ 1102 recover_orphan_inodes(sbi); 1103 1104 /* read root inode and dentry */ 1105 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); 1106 if (IS_ERR(root)) { 1107 f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); 1108 err = PTR_ERR(root); 1109 goto free_node_inode; 1110 } 1111 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1112 iput(root); 1113 err = -EINVAL; 1114 goto free_node_inode; 1115 } 1116 1117 sb->s_root = d_make_root(root); /* allocate root dentry */ 1118 if (!sb->s_root) { 1119 err = -ENOMEM; 1120 goto free_root_inode; 1121 } 1122 1123 err = f2fs_build_stats(sbi); 1124 if (err) 1125 goto free_root_inode; 1126 1127 if (f2fs_proc_root) 1128 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); 1129 1130 if (sbi->s_proc) 1131 proc_create_data("segment_info", S_IRUGO, sbi->s_proc, 1132 &f2fs_seq_segment_info_fops, sb); 1133 1134 if (test_opt(sbi, DISCARD)) { 1135 struct request_queue *q = bdev_get_queue(sb->s_bdev); 1136 if (!blk_queue_discard(q)) 1137 f2fs_msg(sb, KERN_WARNING, 1138 "mounting with \"discard\" option, but " 1139 "the device does not support discard"); 1140 } 1141 1142 sbi->s_kobj.kset = f2fs_kset; 1143 init_completion(&sbi->s_kobj_unregister); 1144 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, 1145 "%s", sb->s_id); 1146 if (err) 1147 goto free_proc; 1148 1149 if (!retry) 1150 set_sbi_flag(sbi, SBI_NEED_FSCK); 1151 1152 /* recover fsynced data */ 1153 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { 1154 /* 1155 * mount should be failed, when device has readonly mode, and 1156 * previous checkpoint was not done by clean system shutdown. 1157 */ 1158 if (bdev_read_only(sb->s_bdev) && 1159 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) { 1160 err = -EROFS; 1161 goto free_kobj; 1162 } 1163 err = recover_fsync_data(sbi); 1164 if (err) { 1165 f2fs_msg(sb, KERN_ERR, 1166 "Cannot recover all fsync data errno=%ld", err); 1167 goto free_kobj; 1168 } 1169 } 1170 1171 /* 1172 * If filesystem is not mounted as read-only then 1173 * do start the gc_thread. 1174 */ 1175 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) { 1176 /* After POR, we can run background GC thread.*/ 1177 err = start_gc_thread(sbi); 1178 if (err) 1179 goto free_kobj; 1180 } 1181 kfree(options); 1182 return 0; 1183 1184 free_kobj: 1185 kobject_del(&sbi->s_kobj); 1186 free_proc: 1187 if (sbi->s_proc) { 1188 remove_proc_entry("segment_info", sbi->s_proc); 1189 remove_proc_entry(sb->s_id, f2fs_proc_root); 1190 } 1191 f2fs_destroy_stats(sbi); 1192 free_root_inode: 1193 dput(sb->s_root); 1194 sb->s_root = NULL; 1195 free_node_inode: 1196 iput(sbi->node_inode); 1197 free_nm: 1198 destroy_node_manager(sbi); 1199 free_sm: 1200 destroy_segment_manager(sbi); 1201 free_cp: 1202 kfree(sbi->ckpt); 1203 free_meta_inode: 1204 make_bad_inode(sbi->meta_inode); 1205 iput(sbi->meta_inode); 1206 free_options: 1207 kfree(options); 1208 free_sb_buf: 1209 brelse(raw_super_buf); 1210 free_sbi: 1211 kfree(sbi); 1212 1213 /* give only one another chance */ 1214 if (retry) { 1215 retry = 0; 1216 shrink_dcache_sb(sb); 1217 goto try_onemore; 1218 } 1219 return err; 1220 } 1221 1222 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, 1223 const char *dev_name, void *data) 1224 { 1225 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); 1226 } 1227 1228 static void kill_f2fs_super(struct super_block *sb) 1229 { 1230 if (sb->s_root) 1231 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE); 1232 kill_block_super(sb); 1233 } 1234 1235 static struct file_system_type f2fs_fs_type = { 1236 .owner = THIS_MODULE, 1237 .name = "f2fs", 1238 .mount = f2fs_mount, 1239 .kill_sb = kill_f2fs_super, 1240 .fs_flags = FS_REQUIRES_DEV, 1241 }; 1242 MODULE_ALIAS_FS("f2fs"); 1243 1244 static int __init init_inodecache(void) 1245 { 1246 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache", 1247 sizeof(struct f2fs_inode_info)); 1248 if (!f2fs_inode_cachep) 1249 return -ENOMEM; 1250 return 0; 1251 } 1252 1253 static void destroy_inodecache(void) 1254 { 1255 /* 1256 * Make sure all delayed rcu free inodes are flushed before we 1257 * destroy cache. 1258 */ 1259 rcu_barrier(); 1260 kmem_cache_destroy(f2fs_inode_cachep); 1261 } 1262 1263 static int __init init_f2fs_fs(void) 1264 { 1265 int err; 1266 1267 f2fs_build_trace_ios(); 1268 1269 err = init_inodecache(); 1270 if (err) 1271 goto fail; 1272 err = create_node_manager_caches(); 1273 if (err) 1274 goto free_inodecache; 1275 err = create_segment_manager_caches(); 1276 if (err) 1277 goto free_node_manager_caches; 1278 err = create_checkpoint_caches(); 1279 if (err) 1280 goto free_segment_manager_caches; 1281 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); 1282 if (!f2fs_kset) { 1283 err = -ENOMEM; 1284 goto free_checkpoint_caches; 1285 } 1286 err = register_filesystem(&f2fs_fs_type); 1287 if (err) 1288 goto free_kset; 1289 f2fs_create_root_stats(); 1290 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); 1291 return 0; 1292 1293 free_kset: 1294 kset_unregister(f2fs_kset); 1295 free_checkpoint_caches: 1296 destroy_checkpoint_caches(); 1297 free_segment_manager_caches: 1298 destroy_segment_manager_caches(); 1299 free_node_manager_caches: 1300 destroy_node_manager_caches(); 1301 free_inodecache: 1302 destroy_inodecache(); 1303 fail: 1304 return err; 1305 } 1306 1307 static void __exit exit_f2fs_fs(void) 1308 { 1309 remove_proc_entry("fs/f2fs", NULL); 1310 f2fs_destroy_root_stats(); 1311 unregister_filesystem(&f2fs_fs_type); 1312 destroy_checkpoint_caches(); 1313 destroy_segment_manager_caches(); 1314 destroy_node_manager_caches(); 1315 destroy_inodecache(); 1316 kset_unregister(f2fs_kset); 1317 f2fs_destroy_trace_ios(); 1318 } 1319 1320 module_init(init_f2fs_fs) 1321 module_exit(exit_f2fs_fs) 1322 1323 MODULE_AUTHOR("Samsung Electronics's Praesto Team"); 1324 MODULE_DESCRIPTION("Flash Friendly File System"); 1325 MODULE_LICENSE("GPL"); 1326