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 /* f2fs-wide shrinker description */ 43 static struct shrinker f2fs_shrinker_info = { 44 .scan_objects = f2fs_shrink_scan, 45 .count_objects = f2fs_shrink_count, 46 .seeks = DEFAULT_SEEKS, 47 }; 48 49 enum { 50 Opt_gc_background, 51 Opt_disable_roll_forward, 52 Opt_norecovery, 53 Opt_discard, 54 Opt_noheap, 55 Opt_user_xattr, 56 Opt_nouser_xattr, 57 Opt_acl, 58 Opt_noacl, 59 Opt_active_logs, 60 Opt_disable_ext_identify, 61 Opt_inline_xattr, 62 Opt_inline_data, 63 Opt_inline_dentry, 64 Opt_flush_merge, 65 Opt_nobarrier, 66 Opt_fastboot, 67 Opt_extent_cache, 68 Opt_noextent_cache, 69 Opt_noinline_data, 70 Opt_data_flush, 71 Opt_err, 72 }; 73 74 static match_table_t f2fs_tokens = { 75 {Opt_gc_background, "background_gc=%s"}, 76 {Opt_disable_roll_forward, "disable_roll_forward"}, 77 {Opt_norecovery, "norecovery"}, 78 {Opt_discard, "discard"}, 79 {Opt_noheap, "no_heap"}, 80 {Opt_user_xattr, "user_xattr"}, 81 {Opt_nouser_xattr, "nouser_xattr"}, 82 {Opt_acl, "acl"}, 83 {Opt_noacl, "noacl"}, 84 {Opt_active_logs, "active_logs=%u"}, 85 {Opt_disable_ext_identify, "disable_ext_identify"}, 86 {Opt_inline_xattr, "inline_xattr"}, 87 {Opt_inline_data, "inline_data"}, 88 {Opt_inline_dentry, "inline_dentry"}, 89 {Opt_flush_merge, "flush_merge"}, 90 {Opt_nobarrier, "nobarrier"}, 91 {Opt_fastboot, "fastboot"}, 92 {Opt_extent_cache, "extent_cache"}, 93 {Opt_noextent_cache, "noextent_cache"}, 94 {Opt_noinline_data, "noinline_data"}, 95 {Opt_data_flush, "data_flush"}, 96 {Opt_err, NULL}, 97 }; 98 99 /* Sysfs support for f2fs */ 100 enum { 101 GC_THREAD, /* struct f2fs_gc_thread */ 102 SM_INFO, /* struct f2fs_sm_info */ 103 NM_INFO, /* struct f2fs_nm_info */ 104 F2FS_SBI, /* struct f2fs_sb_info */ 105 }; 106 107 struct f2fs_attr { 108 struct attribute attr; 109 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *); 110 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *, 111 const char *, size_t); 112 int struct_type; 113 int offset; 114 }; 115 116 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type) 117 { 118 if (struct_type == GC_THREAD) 119 return (unsigned char *)sbi->gc_thread; 120 else if (struct_type == SM_INFO) 121 return (unsigned char *)SM_I(sbi); 122 else if (struct_type == NM_INFO) 123 return (unsigned char *)NM_I(sbi); 124 else if (struct_type == F2FS_SBI) 125 return (unsigned char *)sbi; 126 return NULL; 127 } 128 129 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a, 130 struct f2fs_sb_info *sbi, char *buf) 131 { 132 struct super_block *sb = sbi->sb; 133 134 if (!sb->s_bdev->bd_part) 135 return snprintf(buf, PAGE_SIZE, "0\n"); 136 137 return snprintf(buf, PAGE_SIZE, "%llu\n", 138 (unsigned long long)(sbi->kbytes_written + 139 BD_PART_WRITTEN(sbi))); 140 } 141 142 static ssize_t f2fs_sbi_show(struct f2fs_attr *a, 143 struct f2fs_sb_info *sbi, char *buf) 144 { 145 unsigned char *ptr = NULL; 146 unsigned int *ui; 147 148 ptr = __struct_ptr(sbi, a->struct_type); 149 if (!ptr) 150 return -EINVAL; 151 152 ui = (unsigned int *)(ptr + a->offset); 153 154 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 155 } 156 157 static ssize_t f2fs_sbi_store(struct f2fs_attr *a, 158 struct f2fs_sb_info *sbi, 159 const char *buf, size_t count) 160 { 161 unsigned char *ptr; 162 unsigned long t; 163 unsigned int *ui; 164 ssize_t ret; 165 166 ptr = __struct_ptr(sbi, a->struct_type); 167 if (!ptr) 168 return -EINVAL; 169 170 ui = (unsigned int *)(ptr + a->offset); 171 172 ret = kstrtoul(skip_spaces(buf), 0, &t); 173 if (ret < 0) 174 return ret; 175 *ui = t; 176 return count; 177 } 178 179 static ssize_t f2fs_attr_show(struct kobject *kobj, 180 struct attribute *attr, char *buf) 181 { 182 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 183 s_kobj); 184 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 185 186 return a->show ? a->show(a, sbi, buf) : 0; 187 } 188 189 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr, 190 const char *buf, size_t len) 191 { 192 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 193 s_kobj); 194 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 195 196 return a->store ? a->store(a, sbi, buf, len) : 0; 197 } 198 199 static void f2fs_sb_release(struct kobject *kobj) 200 { 201 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 202 s_kobj); 203 complete(&sbi->s_kobj_unregister); 204 } 205 206 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \ 207 static struct f2fs_attr f2fs_attr_##_name = { \ 208 .attr = {.name = __stringify(_name), .mode = _mode }, \ 209 .show = _show, \ 210 .store = _store, \ 211 .struct_type = _struct_type, \ 212 .offset = _offset \ 213 } 214 215 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \ 216 F2FS_ATTR_OFFSET(struct_type, name, 0644, \ 217 f2fs_sbi_show, f2fs_sbi_store, \ 218 offsetof(struct struct_name, elname)) 219 220 #define F2FS_GENERAL_RO_ATTR(name) \ 221 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL) 222 223 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); 224 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); 225 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); 226 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); 227 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); 228 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); 229 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); 230 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 231 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util); 232 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks); 233 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh); 234 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages); 235 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio); 236 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search); 237 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level); 238 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]); 239 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]); 240 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes); 241 242 #define ATTR_LIST(name) (&f2fs_attr_##name.attr) 243 static struct attribute *f2fs_attrs[] = { 244 ATTR_LIST(gc_min_sleep_time), 245 ATTR_LIST(gc_max_sleep_time), 246 ATTR_LIST(gc_no_gc_sleep_time), 247 ATTR_LIST(gc_idle), 248 ATTR_LIST(reclaim_segments), 249 ATTR_LIST(max_small_discards), 250 ATTR_LIST(batched_trim_sections), 251 ATTR_LIST(ipu_policy), 252 ATTR_LIST(min_ipu_util), 253 ATTR_LIST(min_fsync_blocks), 254 ATTR_LIST(max_victim_search), 255 ATTR_LIST(dir_level), 256 ATTR_LIST(ram_thresh), 257 ATTR_LIST(ra_nid_pages), 258 ATTR_LIST(dirty_nats_ratio), 259 ATTR_LIST(cp_interval), 260 ATTR_LIST(idle_interval), 261 ATTR_LIST(lifetime_write_kbytes), 262 NULL, 263 }; 264 265 static const struct sysfs_ops f2fs_attr_ops = { 266 .show = f2fs_attr_show, 267 .store = f2fs_attr_store, 268 }; 269 270 static struct kobj_type f2fs_ktype = { 271 .default_attrs = f2fs_attrs, 272 .sysfs_ops = &f2fs_attr_ops, 273 .release = f2fs_sb_release, 274 }; 275 276 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) 277 { 278 struct va_format vaf; 279 va_list args; 280 281 va_start(args, fmt); 282 vaf.fmt = fmt; 283 vaf.va = &args; 284 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); 285 va_end(args); 286 } 287 288 static void init_once(void *foo) 289 { 290 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; 291 292 inode_init_once(&fi->vfs_inode); 293 } 294 295 static int parse_options(struct super_block *sb, char *options) 296 { 297 struct f2fs_sb_info *sbi = F2FS_SB(sb); 298 struct request_queue *q; 299 substring_t args[MAX_OPT_ARGS]; 300 char *p, *name; 301 int arg = 0; 302 303 if (!options) 304 return 0; 305 306 while ((p = strsep(&options, ",")) != NULL) { 307 int token; 308 if (!*p) 309 continue; 310 /* 311 * Initialize args struct so we know whether arg was 312 * found; some options take optional arguments. 313 */ 314 args[0].to = args[0].from = NULL; 315 token = match_token(p, f2fs_tokens, args); 316 317 switch (token) { 318 case Opt_gc_background: 319 name = match_strdup(&args[0]); 320 321 if (!name) 322 return -ENOMEM; 323 if (strlen(name) == 2 && !strncmp(name, "on", 2)) { 324 set_opt(sbi, BG_GC); 325 clear_opt(sbi, FORCE_FG_GC); 326 } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) { 327 clear_opt(sbi, BG_GC); 328 clear_opt(sbi, FORCE_FG_GC); 329 } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) { 330 set_opt(sbi, BG_GC); 331 set_opt(sbi, FORCE_FG_GC); 332 } else { 333 kfree(name); 334 return -EINVAL; 335 } 336 kfree(name); 337 break; 338 case Opt_disable_roll_forward: 339 set_opt(sbi, DISABLE_ROLL_FORWARD); 340 break; 341 case Opt_norecovery: 342 /* this option mounts f2fs with ro */ 343 set_opt(sbi, DISABLE_ROLL_FORWARD); 344 if (!f2fs_readonly(sb)) 345 return -EINVAL; 346 break; 347 case Opt_discard: 348 q = bdev_get_queue(sb->s_bdev); 349 if (blk_queue_discard(q)) { 350 set_opt(sbi, DISCARD); 351 } else { 352 f2fs_msg(sb, KERN_WARNING, 353 "mounting with \"discard\" option, but " 354 "the device does not support discard"); 355 } 356 break; 357 case Opt_noheap: 358 set_opt(sbi, NOHEAP); 359 break; 360 #ifdef CONFIG_F2FS_FS_XATTR 361 case Opt_user_xattr: 362 set_opt(sbi, XATTR_USER); 363 break; 364 case Opt_nouser_xattr: 365 clear_opt(sbi, XATTR_USER); 366 break; 367 case Opt_inline_xattr: 368 set_opt(sbi, INLINE_XATTR); 369 break; 370 #else 371 case Opt_user_xattr: 372 f2fs_msg(sb, KERN_INFO, 373 "user_xattr options not supported"); 374 break; 375 case Opt_nouser_xattr: 376 f2fs_msg(sb, KERN_INFO, 377 "nouser_xattr options not supported"); 378 break; 379 case Opt_inline_xattr: 380 f2fs_msg(sb, KERN_INFO, 381 "inline_xattr options not supported"); 382 break; 383 #endif 384 #ifdef CONFIG_F2FS_FS_POSIX_ACL 385 case Opt_acl: 386 set_opt(sbi, POSIX_ACL); 387 break; 388 case Opt_noacl: 389 clear_opt(sbi, POSIX_ACL); 390 break; 391 #else 392 case Opt_acl: 393 f2fs_msg(sb, KERN_INFO, "acl options not supported"); 394 break; 395 case Opt_noacl: 396 f2fs_msg(sb, KERN_INFO, "noacl options not supported"); 397 break; 398 #endif 399 case Opt_active_logs: 400 if (args->from && match_int(args, &arg)) 401 return -EINVAL; 402 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) 403 return -EINVAL; 404 sbi->active_logs = arg; 405 break; 406 case Opt_disable_ext_identify: 407 set_opt(sbi, DISABLE_EXT_IDENTIFY); 408 break; 409 case Opt_inline_data: 410 set_opt(sbi, INLINE_DATA); 411 break; 412 case Opt_inline_dentry: 413 set_opt(sbi, INLINE_DENTRY); 414 break; 415 case Opt_flush_merge: 416 set_opt(sbi, FLUSH_MERGE); 417 break; 418 case Opt_nobarrier: 419 set_opt(sbi, NOBARRIER); 420 break; 421 case Opt_fastboot: 422 set_opt(sbi, FASTBOOT); 423 break; 424 case Opt_extent_cache: 425 set_opt(sbi, EXTENT_CACHE); 426 break; 427 case Opt_noextent_cache: 428 clear_opt(sbi, EXTENT_CACHE); 429 break; 430 case Opt_noinline_data: 431 clear_opt(sbi, INLINE_DATA); 432 break; 433 case Opt_data_flush: 434 set_opt(sbi, DATA_FLUSH); 435 break; 436 default: 437 f2fs_msg(sb, KERN_ERR, 438 "Unrecognized mount option \"%s\" or missing value", 439 p); 440 return -EINVAL; 441 } 442 } 443 return 0; 444 } 445 446 static struct inode *f2fs_alloc_inode(struct super_block *sb) 447 { 448 struct f2fs_inode_info *fi; 449 450 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO); 451 if (!fi) 452 return NULL; 453 454 init_once((void *) fi); 455 456 /* Initialize f2fs-specific inode info */ 457 fi->vfs_inode.i_version = 1; 458 atomic_set(&fi->dirty_pages, 0); 459 fi->i_current_depth = 1; 460 fi->i_advise = 0; 461 init_rwsem(&fi->i_sem); 462 INIT_LIST_HEAD(&fi->dirty_list); 463 INIT_LIST_HEAD(&fi->inmem_pages); 464 mutex_init(&fi->inmem_lock); 465 466 set_inode_flag(fi, FI_NEW_INODE); 467 468 if (test_opt(F2FS_SB(sb), INLINE_XATTR)) 469 set_inode_flag(fi, FI_INLINE_XATTR); 470 471 /* Will be used by directory only */ 472 fi->i_dir_level = F2FS_SB(sb)->dir_level; 473 return &fi->vfs_inode; 474 } 475 476 static int f2fs_drop_inode(struct inode *inode) 477 { 478 /* 479 * This is to avoid a deadlock condition like below. 480 * writeback_single_inode(inode) 481 * - f2fs_write_data_page 482 * - f2fs_gc -> iput -> evict 483 * - inode_wait_for_writeback(inode) 484 */ 485 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) { 486 if (!inode->i_nlink && !is_bad_inode(inode)) { 487 /* to avoid evict_inode call simultaneously */ 488 atomic_inc(&inode->i_count); 489 spin_unlock(&inode->i_lock); 490 491 /* some remained atomic pages should discarded */ 492 if (f2fs_is_atomic_file(inode)) 493 drop_inmem_pages(inode); 494 495 /* should remain fi->extent_tree for writepage */ 496 f2fs_destroy_extent_node(inode); 497 498 sb_start_intwrite(inode->i_sb); 499 i_size_write(inode, 0); 500 501 if (F2FS_HAS_BLOCKS(inode)) 502 f2fs_truncate(inode, true); 503 504 sb_end_intwrite(inode->i_sb); 505 506 fscrypt_put_encryption_info(inode, NULL); 507 spin_lock(&inode->i_lock); 508 atomic_dec(&inode->i_count); 509 } 510 return 0; 511 } 512 return generic_drop_inode(inode); 513 } 514 515 /* 516 * f2fs_dirty_inode() is called from __mark_inode_dirty() 517 * 518 * We should call set_dirty_inode to write the dirty inode through write_inode. 519 */ 520 static void f2fs_dirty_inode(struct inode *inode, int flags) 521 { 522 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE); 523 } 524 525 static void f2fs_i_callback(struct rcu_head *head) 526 { 527 struct inode *inode = container_of(head, struct inode, i_rcu); 528 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); 529 } 530 531 static void f2fs_destroy_inode(struct inode *inode) 532 { 533 call_rcu(&inode->i_rcu, f2fs_i_callback); 534 } 535 536 static void f2fs_put_super(struct super_block *sb) 537 { 538 struct f2fs_sb_info *sbi = F2FS_SB(sb); 539 540 if (sbi->s_proc) { 541 remove_proc_entry("segment_info", sbi->s_proc); 542 remove_proc_entry(sb->s_id, f2fs_proc_root); 543 } 544 kobject_del(&sbi->s_kobj); 545 546 stop_gc_thread(sbi); 547 548 /* prevent remaining shrinker jobs */ 549 mutex_lock(&sbi->umount_mutex); 550 551 /* 552 * We don't need to do checkpoint when superblock is clean. 553 * But, the previous checkpoint was not done by umount, it needs to do 554 * clean checkpoint again. 555 */ 556 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) || 557 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) { 558 struct cp_control cpc = { 559 .reason = CP_UMOUNT, 560 }; 561 write_checkpoint(sbi, &cpc); 562 } 563 564 /* write_checkpoint can update stat informaion */ 565 f2fs_destroy_stats(sbi); 566 567 /* 568 * normally superblock is clean, so we need to release this. 569 * In addition, EIO will skip do checkpoint, we need this as well. 570 */ 571 release_ino_entry(sbi); 572 release_discard_addrs(sbi); 573 574 f2fs_leave_shrinker(sbi); 575 mutex_unlock(&sbi->umount_mutex); 576 577 /* our cp_error case, we can wait for any writeback page */ 578 if (get_pages(sbi, F2FS_WRITEBACK)) 579 f2fs_flush_merged_bios(sbi); 580 581 iput(sbi->node_inode); 582 iput(sbi->meta_inode); 583 584 /* destroy f2fs internal modules */ 585 destroy_node_manager(sbi); 586 destroy_segment_manager(sbi); 587 588 kfree(sbi->ckpt); 589 kobject_put(&sbi->s_kobj); 590 wait_for_completion(&sbi->s_kobj_unregister); 591 592 sb->s_fs_info = NULL; 593 if (sbi->s_chksum_driver) 594 crypto_free_shash(sbi->s_chksum_driver); 595 kfree(sbi->raw_super); 596 kfree(sbi); 597 } 598 599 int f2fs_sync_fs(struct super_block *sb, int sync) 600 { 601 struct f2fs_sb_info *sbi = F2FS_SB(sb); 602 int err = 0; 603 604 trace_f2fs_sync_fs(sb, sync); 605 606 if (sync) { 607 struct cp_control cpc; 608 609 cpc.reason = __get_cp_reason(sbi); 610 611 mutex_lock(&sbi->gc_mutex); 612 err = write_checkpoint(sbi, &cpc); 613 mutex_unlock(&sbi->gc_mutex); 614 } 615 f2fs_trace_ios(NULL, 1); 616 617 return err; 618 } 619 620 static int f2fs_freeze(struct super_block *sb) 621 { 622 int err; 623 624 if (f2fs_readonly(sb)) 625 return 0; 626 627 err = f2fs_sync_fs(sb, 1); 628 return err; 629 } 630 631 static int f2fs_unfreeze(struct super_block *sb) 632 { 633 return 0; 634 } 635 636 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) 637 { 638 struct super_block *sb = dentry->d_sb; 639 struct f2fs_sb_info *sbi = F2FS_SB(sb); 640 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 641 block_t total_count, user_block_count, start_count, ovp_count; 642 643 total_count = le64_to_cpu(sbi->raw_super->block_count); 644 user_block_count = sbi->user_block_count; 645 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); 646 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; 647 buf->f_type = F2FS_SUPER_MAGIC; 648 buf->f_bsize = sbi->blocksize; 649 650 buf->f_blocks = total_count - start_count; 651 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; 652 buf->f_bavail = user_block_count - valid_user_blocks(sbi); 653 654 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; 655 buf->f_ffree = buf->f_files - valid_inode_count(sbi); 656 657 buf->f_namelen = F2FS_NAME_LEN; 658 buf->f_fsid.val[0] = (u32)id; 659 buf->f_fsid.val[1] = (u32)(id >> 32); 660 661 return 0; 662 } 663 664 static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 665 { 666 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); 667 668 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) { 669 if (test_opt(sbi, FORCE_FG_GC)) 670 seq_printf(seq, ",background_gc=%s", "sync"); 671 else 672 seq_printf(seq, ",background_gc=%s", "on"); 673 } else { 674 seq_printf(seq, ",background_gc=%s", "off"); 675 } 676 if (test_opt(sbi, DISABLE_ROLL_FORWARD)) 677 seq_puts(seq, ",disable_roll_forward"); 678 if (test_opt(sbi, DISCARD)) 679 seq_puts(seq, ",discard"); 680 if (test_opt(sbi, NOHEAP)) 681 seq_puts(seq, ",no_heap_alloc"); 682 #ifdef CONFIG_F2FS_FS_XATTR 683 if (test_opt(sbi, XATTR_USER)) 684 seq_puts(seq, ",user_xattr"); 685 else 686 seq_puts(seq, ",nouser_xattr"); 687 if (test_opt(sbi, INLINE_XATTR)) 688 seq_puts(seq, ",inline_xattr"); 689 #endif 690 #ifdef CONFIG_F2FS_FS_POSIX_ACL 691 if (test_opt(sbi, POSIX_ACL)) 692 seq_puts(seq, ",acl"); 693 else 694 seq_puts(seq, ",noacl"); 695 #endif 696 if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) 697 seq_puts(seq, ",disable_ext_identify"); 698 if (test_opt(sbi, INLINE_DATA)) 699 seq_puts(seq, ",inline_data"); 700 else 701 seq_puts(seq, ",noinline_data"); 702 if (test_opt(sbi, INLINE_DENTRY)) 703 seq_puts(seq, ",inline_dentry"); 704 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE)) 705 seq_puts(seq, ",flush_merge"); 706 if (test_opt(sbi, NOBARRIER)) 707 seq_puts(seq, ",nobarrier"); 708 if (test_opt(sbi, FASTBOOT)) 709 seq_puts(seq, ",fastboot"); 710 if (test_opt(sbi, EXTENT_CACHE)) 711 seq_puts(seq, ",extent_cache"); 712 else 713 seq_puts(seq, ",noextent_cache"); 714 if (test_opt(sbi, DATA_FLUSH)) 715 seq_puts(seq, ",data_flush"); 716 seq_printf(seq, ",active_logs=%u", sbi->active_logs); 717 718 return 0; 719 } 720 721 static int segment_info_seq_show(struct seq_file *seq, void *offset) 722 { 723 struct super_block *sb = seq->private; 724 struct f2fs_sb_info *sbi = F2FS_SB(sb); 725 unsigned int total_segs = 726 le32_to_cpu(sbi->raw_super->segment_count_main); 727 int i; 728 729 seq_puts(seq, "format: segment_type|valid_blocks\n" 730 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n"); 731 732 for (i = 0; i < total_segs; i++) { 733 struct seg_entry *se = get_seg_entry(sbi, i); 734 735 if ((i % 10) == 0) 736 seq_printf(seq, "%-10d", i); 737 seq_printf(seq, "%d|%-3u", se->type, 738 get_valid_blocks(sbi, i, 1)); 739 if ((i % 10) == 9 || i == (total_segs - 1)) 740 seq_putc(seq, '\n'); 741 else 742 seq_putc(seq, ' '); 743 } 744 745 return 0; 746 } 747 748 static int segment_info_open_fs(struct inode *inode, struct file *file) 749 { 750 return single_open(file, segment_info_seq_show, PDE_DATA(inode)); 751 } 752 753 static const struct file_operations f2fs_seq_segment_info_fops = { 754 .owner = THIS_MODULE, 755 .open = segment_info_open_fs, 756 .read = seq_read, 757 .llseek = seq_lseek, 758 .release = single_release, 759 }; 760 761 static void default_options(struct f2fs_sb_info *sbi) 762 { 763 /* init some FS parameters */ 764 sbi->active_logs = NR_CURSEG_TYPE; 765 766 set_opt(sbi, BG_GC); 767 set_opt(sbi, INLINE_DATA); 768 set_opt(sbi, EXTENT_CACHE); 769 770 #ifdef CONFIG_F2FS_FS_XATTR 771 set_opt(sbi, XATTR_USER); 772 #endif 773 #ifdef CONFIG_F2FS_FS_POSIX_ACL 774 set_opt(sbi, POSIX_ACL); 775 #endif 776 } 777 778 static int f2fs_remount(struct super_block *sb, int *flags, char *data) 779 { 780 struct f2fs_sb_info *sbi = F2FS_SB(sb); 781 struct f2fs_mount_info org_mount_opt; 782 int err, active_logs; 783 bool need_restart_gc = false; 784 bool need_stop_gc = false; 785 bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE); 786 787 /* 788 * Save the old mount options in case we 789 * need to restore them. 790 */ 791 org_mount_opt = sbi->mount_opt; 792 active_logs = sbi->active_logs; 793 794 if (*flags & MS_RDONLY) { 795 set_opt(sbi, FASTBOOT); 796 set_sbi_flag(sbi, SBI_IS_DIRTY); 797 } 798 799 sync_filesystem(sb); 800 801 sbi->mount_opt.opt = 0; 802 default_options(sbi); 803 804 /* parse mount options */ 805 err = parse_options(sb, data); 806 if (err) 807 goto restore_opts; 808 809 /* 810 * Previous and new state of filesystem is RO, 811 * so skip checking GC and FLUSH_MERGE conditions. 812 */ 813 if (f2fs_readonly(sb) && (*flags & MS_RDONLY)) 814 goto skip; 815 816 /* disallow enable/disable extent_cache dynamically */ 817 if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) { 818 err = -EINVAL; 819 f2fs_msg(sbi->sb, KERN_WARNING, 820 "switch extent_cache option is not allowed"); 821 goto restore_opts; 822 } 823 824 /* 825 * We stop the GC thread if FS is mounted as RO 826 * or if background_gc = off is passed in mount 827 * option. Also sync the filesystem. 828 */ 829 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) { 830 if (sbi->gc_thread) { 831 stop_gc_thread(sbi); 832 f2fs_sync_fs(sb, 1); 833 need_restart_gc = true; 834 } 835 } else if (!sbi->gc_thread) { 836 err = start_gc_thread(sbi); 837 if (err) 838 goto restore_opts; 839 need_stop_gc = true; 840 } 841 842 /* 843 * We stop issue flush thread if FS is mounted as RO 844 * or if flush_merge is not passed in mount option. 845 */ 846 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) { 847 destroy_flush_cmd_control(sbi); 848 } else if (!SM_I(sbi)->cmd_control_info) { 849 err = create_flush_cmd_control(sbi); 850 if (err) 851 goto restore_gc; 852 } 853 skip: 854 /* Update the POSIXACL Flag */ 855 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 856 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 857 return 0; 858 restore_gc: 859 if (need_restart_gc) { 860 if (start_gc_thread(sbi)) 861 f2fs_msg(sbi->sb, KERN_WARNING, 862 "background gc thread has stopped"); 863 } else if (need_stop_gc) { 864 stop_gc_thread(sbi); 865 } 866 restore_opts: 867 sbi->mount_opt = org_mount_opt; 868 sbi->active_logs = active_logs; 869 return err; 870 } 871 872 static struct super_operations f2fs_sops = { 873 .alloc_inode = f2fs_alloc_inode, 874 .drop_inode = f2fs_drop_inode, 875 .destroy_inode = f2fs_destroy_inode, 876 .write_inode = f2fs_write_inode, 877 .dirty_inode = f2fs_dirty_inode, 878 .show_options = f2fs_show_options, 879 .evict_inode = f2fs_evict_inode, 880 .put_super = f2fs_put_super, 881 .sync_fs = f2fs_sync_fs, 882 .freeze_fs = f2fs_freeze, 883 .unfreeze_fs = f2fs_unfreeze, 884 .statfs = f2fs_statfs, 885 .remount_fs = f2fs_remount, 886 }; 887 888 #ifdef CONFIG_F2FS_FS_ENCRYPTION 889 static int f2fs_get_context(struct inode *inode, void *ctx, size_t len) 890 { 891 return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION, 892 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT, 893 ctx, len, NULL); 894 } 895 896 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len, 897 void *fs_data) 898 { 899 return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION, 900 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT, 901 ctx, len, fs_data, XATTR_CREATE); 902 } 903 904 static unsigned f2fs_max_namelen(struct inode *inode) 905 { 906 return S_ISLNK(inode->i_mode) ? 907 inode->i_sb->s_blocksize : F2FS_NAME_LEN; 908 } 909 910 static struct fscrypt_operations f2fs_cryptops = { 911 .get_context = f2fs_get_context, 912 .set_context = f2fs_set_context, 913 .is_encrypted = f2fs_encrypted_inode, 914 .empty_dir = f2fs_empty_dir, 915 .max_namelen = f2fs_max_namelen, 916 }; 917 #else 918 static struct fscrypt_operations f2fs_cryptops = { 919 .is_encrypted = f2fs_encrypted_inode, 920 }; 921 #endif 922 923 static struct inode *f2fs_nfs_get_inode(struct super_block *sb, 924 u64 ino, u32 generation) 925 { 926 struct f2fs_sb_info *sbi = F2FS_SB(sb); 927 struct inode *inode; 928 929 if (check_nid_range(sbi, ino)) 930 return ERR_PTR(-ESTALE); 931 932 /* 933 * f2fs_iget isn't quite right if the inode is currently unallocated! 934 * However f2fs_iget currently does appropriate checks to handle stale 935 * inodes so everything is OK. 936 */ 937 inode = f2fs_iget(sb, ino); 938 if (IS_ERR(inode)) 939 return ERR_CAST(inode); 940 if (unlikely(generation && inode->i_generation != generation)) { 941 /* we didn't find the right inode.. */ 942 iput(inode); 943 return ERR_PTR(-ESTALE); 944 } 945 return inode; 946 } 947 948 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, 949 int fh_len, int fh_type) 950 { 951 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 952 f2fs_nfs_get_inode); 953 } 954 955 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, 956 int fh_len, int fh_type) 957 { 958 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 959 f2fs_nfs_get_inode); 960 } 961 962 static const struct export_operations f2fs_export_ops = { 963 .fh_to_dentry = f2fs_fh_to_dentry, 964 .fh_to_parent = f2fs_fh_to_parent, 965 .get_parent = f2fs_get_parent, 966 }; 967 968 static loff_t max_file_blocks(void) 969 { 970 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS); 971 loff_t leaf_count = ADDRS_PER_BLOCK; 972 973 /* two direct node blocks */ 974 result += (leaf_count * 2); 975 976 /* two indirect node blocks */ 977 leaf_count *= NIDS_PER_BLOCK; 978 result += (leaf_count * 2); 979 980 /* one double indirect node block */ 981 leaf_count *= NIDS_PER_BLOCK; 982 result += leaf_count; 983 984 return result; 985 } 986 987 static inline bool sanity_check_area_boundary(struct super_block *sb, 988 struct f2fs_super_block *raw_super) 989 { 990 u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr); 991 u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr); 992 u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr); 993 u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr); 994 u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr); 995 u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr); 996 u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt); 997 u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit); 998 u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat); 999 u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa); 1000 u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main); 1001 u32 segment_count = le32_to_cpu(raw_super->segment_count); 1002 u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 1003 1004 if (segment0_blkaddr != cp_blkaddr) { 1005 f2fs_msg(sb, KERN_INFO, 1006 "Mismatch start address, segment0(%u) cp_blkaddr(%u)", 1007 segment0_blkaddr, cp_blkaddr); 1008 return true; 1009 } 1010 1011 if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) != 1012 sit_blkaddr) { 1013 f2fs_msg(sb, KERN_INFO, 1014 "Wrong CP boundary, start(%u) end(%u) blocks(%u)", 1015 cp_blkaddr, sit_blkaddr, 1016 segment_count_ckpt << log_blocks_per_seg); 1017 return true; 1018 } 1019 1020 if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) != 1021 nat_blkaddr) { 1022 f2fs_msg(sb, KERN_INFO, 1023 "Wrong SIT boundary, start(%u) end(%u) blocks(%u)", 1024 sit_blkaddr, nat_blkaddr, 1025 segment_count_sit << log_blocks_per_seg); 1026 return true; 1027 } 1028 1029 if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) != 1030 ssa_blkaddr) { 1031 f2fs_msg(sb, KERN_INFO, 1032 "Wrong NAT boundary, start(%u) end(%u) blocks(%u)", 1033 nat_blkaddr, ssa_blkaddr, 1034 segment_count_nat << log_blocks_per_seg); 1035 return true; 1036 } 1037 1038 if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) != 1039 main_blkaddr) { 1040 f2fs_msg(sb, KERN_INFO, 1041 "Wrong SSA boundary, start(%u) end(%u) blocks(%u)", 1042 ssa_blkaddr, main_blkaddr, 1043 segment_count_ssa << log_blocks_per_seg); 1044 return true; 1045 } 1046 1047 if (main_blkaddr + (segment_count_main << log_blocks_per_seg) != 1048 segment0_blkaddr + (segment_count << log_blocks_per_seg)) { 1049 f2fs_msg(sb, KERN_INFO, 1050 "Wrong MAIN_AREA boundary, start(%u) end(%u) blocks(%u)", 1051 main_blkaddr, 1052 segment0_blkaddr + (segment_count << log_blocks_per_seg), 1053 segment_count_main << log_blocks_per_seg); 1054 return true; 1055 } 1056 1057 return false; 1058 } 1059 1060 static int sanity_check_raw_super(struct super_block *sb, 1061 struct f2fs_super_block *raw_super) 1062 { 1063 unsigned int blocksize; 1064 1065 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { 1066 f2fs_msg(sb, KERN_INFO, 1067 "Magic Mismatch, valid(0x%x) - read(0x%x)", 1068 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); 1069 return 1; 1070 } 1071 1072 /* Currently, support only 4KB page cache size */ 1073 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { 1074 f2fs_msg(sb, KERN_INFO, 1075 "Invalid page_cache_size (%lu), supports only 4KB\n", 1076 PAGE_CACHE_SIZE); 1077 return 1; 1078 } 1079 1080 /* Currently, support only 4KB block size */ 1081 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); 1082 if (blocksize != F2FS_BLKSIZE) { 1083 f2fs_msg(sb, KERN_INFO, 1084 "Invalid blocksize (%u), supports only 4KB\n", 1085 blocksize); 1086 return 1; 1087 } 1088 1089 /* check log blocks per segment */ 1090 if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) { 1091 f2fs_msg(sb, KERN_INFO, 1092 "Invalid log blocks per segment (%u)\n", 1093 le32_to_cpu(raw_super->log_blocks_per_seg)); 1094 return 1; 1095 } 1096 1097 /* Currently, support 512/1024/2048/4096 bytes sector size */ 1098 if (le32_to_cpu(raw_super->log_sectorsize) > 1099 F2FS_MAX_LOG_SECTOR_SIZE || 1100 le32_to_cpu(raw_super->log_sectorsize) < 1101 F2FS_MIN_LOG_SECTOR_SIZE) { 1102 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)", 1103 le32_to_cpu(raw_super->log_sectorsize)); 1104 return 1; 1105 } 1106 if (le32_to_cpu(raw_super->log_sectors_per_block) + 1107 le32_to_cpu(raw_super->log_sectorsize) != 1108 F2FS_MAX_LOG_SECTOR_SIZE) { 1109 f2fs_msg(sb, KERN_INFO, 1110 "Invalid log sectors per block(%u) log sectorsize(%u)", 1111 le32_to_cpu(raw_super->log_sectors_per_block), 1112 le32_to_cpu(raw_super->log_sectorsize)); 1113 return 1; 1114 } 1115 1116 /* check reserved ino info */ 1117 if (le32_to_cpu(raw_super->node_ino) != 1 || 1118 le32_to_cpu(raw_super->meta_ino) != 2 || 1119 le32_to_cpu(raw_super->root_ino) != 3) { 1120 f2fs_msg(sb, KERN_INFO, 1121 "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)", 1122 le32_to_cpu(raw_super->node_ino), 1123 le32_to_cpu(raw_super->meta_ino), 1124 le32_to_cpu(raw_super->root_ino)); 1125 return 1; 1126 } 1127 1128 /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */ 1129 if (sanity_check_area_boundary(sb, raw_super)) 1130 return 1; 1131 1132 return 0; 1133 } 1134 1135 int sanity_check_ckpt(struct f2fs_sb_info *sbi) 1136 { 1137 unsigned int total, fsmeta; 1138 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); 1139 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 1140 1141 total = le32_to_cpu(raw_super->segment_count); 1142 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); 1143 fsmeta += le32_to_cpu(raw_super->segment_count_sit); 1144 fsmeta += le32_to_cpu(raw_super->segment_count_nat); 1145 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); 1146 fsmeta += le32_to_cpu(raw_super->segment_count_ssa); 1147 1148 if (unlikely(fsmeta >= total)) 1149 return 1; 1150 1151 if (unlikely(f2fs_cp_error(sbi))) { 1152 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); 1153 return 1; 1154 } 1155 return 0; 1156 } 1157 1158 static void init_sb_info(struct f2fs_sb_info *sbi) 1159 { 1160 struct f2fs_super_block *raw_super = sbi->raw_super; 1161 int i; 1162 1163 sbi->log_sectors_per_block = 1164 le32_to_cpu(raw_super->log_sectors_per_block); 1165 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); 1166 sbi->blocksize = 1 << sbi->log_blocksize; 1167 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 1168 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; 1169 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); 1170 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); 1171 sbi->total_sections = le32_to_cpu(raw_super->section_count); 1172 sbi->total_node_count = 1173 (le32_to_cpu(raw_super->segment_count_nat) / 2) 1174 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; 1175 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); 1176 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); 1177 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); 1178 sbi->cur_victim_sec = NULL_SECNO; 1179 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH; 1180 1181 for (i = 0; i < NR_COUNT_TYPE; i++) 1182 atomic_set(&sbi->nr_pages[i], 0); 1183 1184 sbi->dir_level = DEF_DIR_LEVEL; 1185 sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL; 1186 sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL; 1187 clear_sbi_flag(sbi, SBI_NEED_FSCK); 1188 1189 INIT_LIST_HEAD(&sbi->s_list); 1190 mutex_init(&sbi->umount_mutex); 1191 } 1192 1193 /* 1194 * Read f2fs raw super block. 1195 * Because we have two copies of super block, so read both of them 1196 * to get the first valid one. If any one of them is broken, we pass 1197 * them recovery flag back to the caller. 1198 */ 1199 static int read_raw_super_block(struct super_block *sb, 1200 struct f2fs_super_block **raw_super, 1201 int *valid_super_block, int *recovery) 1202 { 1203 int block; 1204 struct buffer_head *bh; 1205 struct f2fs_super_block *super, *buf; 1206 int err = 0; 1207 1208 super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL); 1209 if (!super) 1210 return -ENOMEM; 1211 1212 for (block = 0; block < 2; block++) { 1213 bh = sb_bread(sb, block); 1214 if (!bh) { 1215 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock", 1216 block + 1); 1217 err = -EIO; 1218 continue; 1219 } 1220 1221 buf = (struct f2fs_super_block *) 1222 (bh->b_data + F2FS_SUPER_OFFSET); 1223 1224 /* sanity checking of raw super */ 1225 if (sanity_check_raw_super(sb, buf)) { 1226 f2fs_msg(sb, KERN_ERR, 1227 "Can't find valid F2FS filesystem in %dth superblock", 1228 block + 1); 1229 err = -EINVAL; 1230 brelse(bh); 1231 continue; 1232 } 1233 1234 if (!*raw_super) { 1235 memcpy(super, buf, sizeof(*super)); 1236 *valid_super_block = block; 1237 *raw_super = super; 1238 } 1239 brelse(bh); 1240 } 1241 1242 /* Fail to read any one of the superblocks*/ 1243 if (err < 0) 1244 *recovery = 1; 1245 1246 /* No valid superblock */ 1247 if (!*raw_super) 1248 kfree(super); 1249 else 1250 err = 0; 1251 1252 return err; 1253 } 1254 1255 static int __f2fs_commit_super(struct f2fs_sb_info *sbi, int block) 1256 { 1257 struct f2fs_super_block *super = F2FS_RAW_SUPER(sbi); 1258 struct buffer_head *bh; 1259 int err; 1260 1261 bh = sb_getblk(sbi->sb, block); 1262 if (!bh) 1263 return -EIO; 1264 1265 lock_buffer(bh); 1266 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super)); 1267 set_buffer_uptodate(bh); 1268 set_buffer_dirty(bh); 1269 unlock_buffer(bh); 1270 1271 /* it's rare case, we can do fua all the time */ 1272 err = __sync_dirty_buffer(bh, WRITE_FLUSH_FUA); 1273 brelse(bh); 1274 1275 return err; 1276 } 1277 1278 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover) 1279 { 1280 int err; 1281 1282 /* write back-up superblock first */ 1283 err = __f2fs_commit_super(sbi, sbi->valid_super_block ? 0 : 1); 1284 1285 /* if we are in recovery path, skip writing valid superblock */ 1286 if (recover || err) 1287 return err; 1288 1289 /* write current valid superblock */ 1290 return __f2fs_commit_super(sbi, sbi->valid_super_block); 1291 } 1292 1293 static int f2fs_fill_super(struct super_block *sb, void *data, int silent) 1294 { 1295 struct f2fs_sb_info *sbi; 1296 struct f2fs_super_block *raw_super; 1297 struct inode *root; 1298 long err; 1299 bool retry = true, need_fsck = false; 1300 char *options = NULL; 1301 int recovery, i, valid_super_block; 1302 struct curseg_info *seg_i; 1303 1304 try_onemore: 1305 err = -EINVAL; 1306 raw_super = NULL; 1307 valid_super_block = -1; 1308 recovery = 0; 1309 1310 /* allocate memory for f2fs-specific super block info */ 1311 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); 1312 if (!sbi) 1313 return -ENOMEM; 1314 1315 /* Load the checksum driver */ 1316 sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0); 1317 if (IS_ERR(sbi->s_chksum_driver)) { 1318 f2fs_msg(sb, KERN_ERR, "Cannot load crc32 driver."); 1319 err = PTR_ERR(sbi->s_chksum_driver); 1320 sbi->s_chksum_driver = NULL; 1321 goto free_sbi; 1322 } 1323 1324 /* set a block size */ 1325 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) { 1326 f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); 1327 goto free_sbi; 1328 } 1329 1330 err = read_raw_super_block(sb, &raw_super, &valid_super_block, 1331 &recovery); 1332 if (err) 1333 goto free_sbi; 1334 1335 sb->s_fs_info = sbi; 1336 default_options(sbi); 1337 /* parse mount options */ 1338 options = kstrdup((const char *)data, GFP_KERNEL); 1339 if (data && !options) { 1340 err = -ENOMEM; 1341 goto free_sb_buf; 1342 } 1343 1344 err = parse_options(sb, options); 1345 if (err) 1346 goto free_options; 1347 1348 sbi->max_file_blocks = max_file_blocks(); 1349 sb->s_maxbytes = sbi->max_file_blocks << 1350 le32_to_cpu(raw_super->log_blocksize); 1351 sb->s_max_links = F2FS_LINK_MAX; 1352 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1353 1354 sb->s_op = &f2fs_sops; 1355 sb->s_cop = &f2fs_cryptops; 1356 sb->s_xattr = f2fs_xattr_handlers; 1357 sb->s_export_op = &f2fs_export_ops; 1358 sb->s_magic = F2FS_SUPER_MAGIC; 1359 sb->s_time_gran = 1; 1360 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1361 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 1362 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); 1363 1364 /* init f2fs-specific super block info */ 1365 sbi->sb = sb; 1366 sbi->raw_super = raw_super; 1367 sbi->valid_super_block = valid_super_block; 1368 mutex_init(&sbi->gc_mutex); 1369 mutex_init(&sbi->writepages); 1370 mutex_init(&sbi->cp_mutex); 1371 init_rwsem(&sbi->node_write); 1372 1373 /* disallow all the data/node/meta page writes */ 1374 set_sbi_flag(sbi, SBI_POR_DOING); 1375 spin_lock_init(&sbi->stat_lock); 1376 1377 init_rwsem(&sbi->read_io.io_rwsem); 1378 sbi->read_io.sbi = sbi; 1379 sbi->read_io.bio = NULL; 1380 for (i = 0; i < NR_PAGE_TYPE; i++) { 1381 init_rwsem(&sbi->write_io[i].io_rwsem); 1382 sbi->write_io[i].sbi = sbi; 1383 sbi->write_io[i].bio = NULL; 1384 } 1385 1386 init_rwsem(&sbi->cp_rwsem); 1387 init_waitqueue_head(&sbi->cp_wait); 1388 init_sb_info(sbi); 1389 1390 /* get an inode for meta space */ 1391 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); 1392 if (IS_ERR(sbi->meta_inode)) { 1393 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); 1394 err = PTR_ERR(sbi->meta_inode); 1395 goto free_options; 1396 } 1397 1398 err = get_valid_checkpoint(sbi); 1399 if (err) { 1400 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); 1401 goto free_meta_inode; 1402 } 1403 1404 sbi->total_valid_node_count = 1405 le32_to_cpu(sbi->ckpt->valid_node_count); 1406 sbi->total_valid_inode_count = 1407 le32_to_cpu(sbi->ckpt->valid_inode_count); 1408 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); 1409 sbi->total_valid_block_count = 1410 le64_to_cpu(sbi->ckpt->valid_block_count); 1411 sbi->last_valid_block_count = sbi->total_valid_block_count; 1412 sbi->alloc_valid_block_count = 0; 1413 for (i = 0; i < NR_INODE_TYPE; i++) { 1414 INIT_LIST_HEAD(&sbi->inode_list[i]); 1415 spin_lock_init(&sbi->inode_lock[i]); 1416 } 1417 1418 init_extent_cache_info(sbi); 1419 1420 init_ino_entry_info(sbi); 1421 1422 /* setup f2fs internal modules */ 1423 err = build_segment_manager(sbi); 1424 if (err) { 1425 f2fs_msg(sb, KERN_ERR, 1426 "Failed to initialize F2FS segment manager"); 1427 goto free_sm; 1428 } 1429 err = build_node_manager(sbi); 1430 if (err) { 1431 f2fs_msg(sb, KERN_ERR, 1432 "Failed to initialize F2FS node manager"); 1433 goto free_nm; 1434 } 1435 1436 /* For write statistics */ 1437 if (sb->s_bdev->bd_part) 1438 sbi->sectors_written_start = 1439 (u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]); 1440 1441 /* Read accumulated write IO statistics if exists */ 1442 seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE); 1443 if (__exist_node_summaries(sbi)) 1444 sbi->kbytes_written = 1445 le64_to_cpu(seg_i->sum_blk->journal.info.kbytes_written); 1446 1447 build_gc_manager(sbi); 1448 1449 /* get an inode for node space */ 1450 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); 1451 if (IS_ERR(sbi->node_inode)) { 1452 f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); 1453 err = PTR_ERR(sbi->node_inode); 1454 goto free_nm; 1455 } 1456 1457 f2fs_join_shrinker(sbi); 1458 1459 /* if there are nt orphan nodes free them */ 1460 err = recover_orphan_inodes(sbi); 1461 if (err) 1462 goto free_node_inode; 1463 1464 /* read root inode and dentry */ 1465 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); 1466 if (IS_ERR(root)) { 1467 f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); 1468 err = PTR_ERR(root); 1469 goto free_node_inode; 1470 } 1471 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1472 iput(root); 1473 err = -EINVAL; 1474 goto free_node_inode; 1475 } 1476 1477 sb->s_root = d_make_root(root); /* allocate root dentry */ 1478 if (!sb->s_root) { 1479 err = -ENOMEM; 1480 goto free_root_inode; 1481 } 1482 1483 err = f2fs_build_stats(sbi); 1484 if (err) 1485 goto free_root_inode; 1486 1487 if (f2fs_proc_root) 1488 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); 1489 1490 if (sbi->s_proc) 1491 proc_create_data("segment_info", S_IRUGO, sbi->s_proc, 1492 &f2fs_seq_segment_info_fops, sb); 1493 1494 sbi->s_kobj.kset = f2fs_kset; 1495 init_completion(&sbi->s_kobj_unregister); 1496 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, 1497 "%s", sb->s_id); 1498 if (err) 1499 goto free_proc; 1500 1501 /* recover fsynced data */ 1502 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { 1503 /* 1504 * mount should be failed, when device has readonly mode, and 1505 * previous checkpoint was not done by clean system shutdown. 1506 */ 1507 if (bdev_read_only(sb->s_bdev) && 1508 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) { 1509 err = -EROFS; 1510 goto free_kobj; 1511 } 1512 1513 if (need_fsck) 1514 set_sbi_flag(sbi, SBI_NEED_FSCK); 1515 1516 err = recover_fsync_data(sbi); 1517 if (err) { 1518 need_fsck = true; 1519 f2fs_msg(sb, KERN_ERR, 1520 "Cannot recover all fsync data errno=%ld", err); 1521 goto free_kobj; 1522 } 1523 } 1524 /* recover_fsync_data() cleared this already */ 1525 clear_sbi_flag(sbi, SBI_POR_DOING); 1526 1527 /* 1528 * If filesystem is not mounted as read-only then 1529 * do start the gc_thread. 1530 */ 1531 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) { 1532 /* After POR, we can run background GC thread.*/ 1533 err = start_gc_thread(sbi); 1534 if (err) 1535 goto free_kobj; 1536 } 1537 kfree(options); 1538 1539 /* recover broken superblock */ 1540 if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) { 1541 err = f2fs_commit_super(sbi, true); 1542 f2fs_msg(sb, KERN_INFO, 1543 "Try to recover %dth superblock, ret: %ld", 1544 sbi->valid_super_block ? 1 : 2, err); 1545 } 1546 1547 f2fs_update_time(sbi, CP_TIME); 1548 f2fs_update_time(sbi, REQ_TIME); 1549 return 0; 1550 1551 free_kobj: 1552 kobject_del(&sbi->s_kobj); 1553 kobject_put(&sbi->s_kobj); 1554 wait_for_completion(&sbi->s_kobj_unregister); 1555 free_proc: 1556 if (sbi->s_proc) { 1557 remove_proc_entry("segment_info", sbi->s_proc); 1558 remove_proc_entry(sb->s_id, f2fs_proc_root); 1559 } 1560 f2fs_destroy_stats(sbi); 1561 free_root_inode: 1562 dput(sb->s_root); 1563 sb->s_root = NULL; 1564 free_node_inode: 1565 mutex_lock(&sbi->umount_mutex); 1566 f2fs_leave_shrinker(sbi); 1567 iput(sbi->node_inode); 1568 mutex_unlock(&sbi->umount_mutex); 1569 free_nm: 1570 destroy_node_manager(sbi); 1571 free_sm: 1572 destroy_segment_manager(sbi); 1573 kfree(sbi->ckpt); 1574 free_meta_inode: 1575 make_bad_inode(sbi->meta_inode); 1576 iput(sbi->meta_inode); 1577 free_options: 1578 kfree(options); 1579 free_sb_buf: 1580 kfree(raw_super); 1581 free_sbi: 1582 if (sbi->s_chksum_driver) 1583 crypto_free_shash(sbi->s_chksum_driver); 1584 kfree(sbi); 1585 1586 /* give only one another chance */ 1587 if (retry) { 1588 retry = false; 1589 shrink_dcache_sb(sb); 1590 goto try_onemore; 1591 } 1592 return err; 1593 } 1594 1595 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, 1596 const char *dev_name, void *data) 1597 { 1598 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); 1599 } 1600 1601 static void kill_f2fs_super(struct super_block *sb) 1602 { 1603 if (sb->s_root) 1604 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE); 1605 kill_block_super(sb); 1606 } 1607 1608 static struct file_system_type f2fs_fs_type = { 1609 .owner = THIS_MODULE, 1610 .name = "f2fs", 1611 .mount = f2fs_mount, 1612 .kill_sb = kill_f2fs_super, 1613 .fs_flags = FS_REQUIRES_DEV, 1614 }; 1615 MODULE_ALIAS_FS("f2fs"); 1616 1617 static int __init init_inodecache(void) 1618 { 1619 f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache", 1620 sizeof(struct f2fs_inode_info), 0, 1621 SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL); 1622 if (!f2fs_inode_cachep) 1623 return -ENOMEM; 1624 return 0; 1625 } 1626 1627 static void destroy_inodecache(void) 1628 { 1629 /* 1630 * Make sure all delayed rcu free inodes are flushed before we 1631 * destroy cache. 1632 */ 1633 rcu_barrier(); 1634 kmem_cache_destroy(f2fs_inode_cachep); 1635 } 1636 1637 static int __init init_f2fs_fs(void) 1638 { 1639 int err; 1640 1641 f2fs_build_trace_ios(); 1642 1643 err = init_inodecache(); 1644 if (err) 1645 goto fail; 1646 err = create_node_manager_caches(); 1647 if (err) 1648 goto free_inodecache; 1649 err = create_segment_manager_caches(); 1650 if (err) 1651 goto free_node_manager_caches; 1652 err = create_checkpoint_caches(); 1653 if (err) 1654 goto free_segment_manager_caches; 1655 err = create_extent_cache(); 1656 if (err) 1657 goto free_checkpoint_caches; 1658 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); 1659 if (!f2fs_kset) { 1660 err = -ENOMEM; 1661 goto free_extent_cache; 1662 } 1663 err = register_shrinker(&f2fs_shrinker_info); 1664 if (err) 1665 goto free_kset; 1666 1667 err = register_filesystem(&f2fs_fs_type); 1668 if (err) 1669 goto free_shrinker; 1670 err = f2fs_create_root_stats(); 1671 if (err) 1672 goto free_filesystem; 1673 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); 1674 return 0; 1675 1676 free_filesystem: 1677 unregister_filesystem(&f2fs_fs_type); 1678 free_shrinker: 1679 unregister_shrinker(&f2fs_shrinker_info); 1680 free_kset: 1681 kset_unregister(f2fs_kset); 1682 free_extent_cache: 1683 destroy_extent_cache(); 1684 free_checkpoint_caches: 1685 destroy_checkpoint_caches(); 1686 free_segment_manager_caches: 1687 destroy_segment_manager_caches(); 1688 free_node_manager_caches: 1689 destroy_node_manager_caches(); 1690 free_inodecache: 1691 destroy_inodecache(); 1692 fail: 1693 return err; 1694 } 1695 1696 static void __exit exit_f2fs_fs(void) 1697 { 1698 remove_proc_entry("fs/f2fs", NULL); 1699 f2fs_destroy_root_stats(); 1700 unregister_shrinker(&f2fs_shrinker_info); 1701 unregister_filesystem(&f2fs_fs_type); 1702 destroy_extent_cache(); 1703 destroy_checkpoint_caches(); 1704 destroy_segment_manager_caches(); 1705 destroy_node_manager_caches(); 1706 destroy_inodecache(); 1707 kset_unregister(f2fs_kset); 1708 f2fs_destroy_trace_ios(); 1709 } 1710 1711 module_init(init_f2fs_fs) 1712 module_exit(exit_f2fs_fs) 1713 1714 MODULE_AUTHOR("Samsung Electronics's Praesto Team"); 1715 MODULE_DESCRIPTION("Flash Friendly File System"); 1716 MODULE_LICENSE("GPL"); 1717