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 f2fs_sbi_show(struct f2fs_attr *a, 130 struct f2fs_sb_info *sbi, char *buf) 131 { 132 unsigned char *ptr = NULL; 133 unsigned int *ui; 134 135 ptr = __struct_ptr(sbi, a->struct_type); 136 if (!ptr) 137 return -EINVAL; 138 139 ui = (unsigned int *)(ptr + a->offset); 140 141 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 142 } 143 144 static ssize_t f2fs_sbi_store(struct f2fs_attr *a, 145 struct f2fs_sb_info *sbi, 146 const char *buf, size_t count) 147 { 148 unsigned char *ptr; 149 unsigned long t; 150 unsigned int *ui; 151 ssize_t ret; 152 153 ptr = __struct_ptr(sbi, a->struct_type); 154 if (!ptr) 155 return -EINVAL; 156 157 ui = (unsigned int *)(ptr + a->offset); 158 159 ret = kstrtoul(skip_spaces(buf), 0, &t); 160 if (ret < 0) 161 return ret; 162 *ui = t; 163 return count; 164 } 165 166 static ssize_t f2fs_attr_show(struct kobject *kobj, 167 struct attribute *attr, char *buf) 168 { 169 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 170 s_kobj); 171 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 172 173 return a->show ? a->show(a, sbi, buf) : 0; 174 } 175 176 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr, 177 const char *buf, size_t len) 178 { 179 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 180 s_kobj); 181 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 182 183 return a->store ? a->store(a, sbi, buf, len) : 0; 184 } 185 186 static void f2fs_sb_release(struct kobject *kobj) 187 { 188 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 189 s_kobj); 190 complete(&sbi->s_kobj_unregister); 191 } 192 193 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \ 194 static struct f2fs_attr f2fs_attr_##_name = { \ 195 .attr = {.name = __stringify(_name), .mode = _mode }, \ 196 .show = _show, \ 197 .store = _store, \ 198 .struct_type = _struct_type, \ 199 .offset = _offset \ 200 } 201 202 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \ 203 F2FS_ATTR_OFFSET(struct_type, name, 0644, \ 204 f2fs_sbi_show, f2fs_sbi_store, \ 205 offsetof(struct struct_name, elname)) 206 207 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); 208 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); 209 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); 210 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); 211 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); 212 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); 213 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); 214 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 215 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util); 216 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks); 217 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh); 218 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages); 219 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search); 220 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level); 221 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]); 222 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]); 223 224 #define ATTR_LIST(name) (&f2fs_attr_##name.attr) 225 static struct attribute *f2fs_attrs[] = { 226 ATTR_LIST(gc_min_sleep_time), 227 ATTR_LIST(gc_max_sleep_time), 228 ATTR_LIST(gc_no_gc_sleep_time), 229 ATTR_LIST(gc_idle), 230 ATTR_LIST(reclaim_segments), 231 ATTR_LIST(max_small_discards), 232 ATTR_LIST(batched_trim_sections), 233 ATTR_LIST(ipu_policy), 234 ATTR_LIST(min_ipu_util), 235 ATTR_LIST(min_fsync_blocks), 236 ATTR_LIST(max_victim_search), 237 ATTR_LIST(dir_level), 238 ATTR_LIST(ram_thresh), 239 ATTR_LIST(ra_nid_pages), 240 ATTR_LIST(cp_interval), 241 ATTR_LIST(idle_interval), 242 NULL, 243 }; 244 245 static const struct sysfs_ops f2fs_attr_ops = { 246 .show = f2fs_attr_show, 247 .store = f2fs_attr_store, 248 }; 249 250 static struct kobj_type f2fs_ktype = { 251 .default_attrs = f2fs_attrs, 252 .sysfs_ops = &f2fs_attr_ops, 253 .release = f2fs_sb_release, 254 }; 255 256 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) 257 { 258 struct va_format vaf; 259 va_list args; 260 261 va_start(args, fmt); 262 vaf.fmt = fmt; 263 vaf.va = &args; 264 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); 265 va_end(args); 266 } 267 268 static void init_once(void *foo) 269 { 270 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; 271 272 inode_init_once(&fi->vfs_inode); 273 } 274 275 static int parse_options(struct super_block *sb, char *options) 276 { 277 struct f2fs_sb_info *sbi = F2FS_SB(sb); 278 struct request_queue *q; 279 substring_t args[MAX_OPT_ARGS]; 280 char *p, *name; 281 int arg = 0; 282 283 if (!options) 284 return 0; 285 286 while ((p = strsep(&options, ",")) != NULL) { 287 int token; 288 if (!*p) 289 continue; 290 /* 291 * Initialize args struct so we know whether arg was 292 * found; some options take optional arguments. 293 */ 294 args[0].to = args[0].from = NULL; 295 token = match_token(p, f2fs_tokens, args); 296 297 switch (token) { 298 case Opt_gc_background: 299 name = match_strdup(&args[0]); 300 301 if (!name) 302 return -ENOMEM; 303 if (strlen(name) == 2 && !strncmp(name, "on", 2)) { 304 set_opt(sbi, BG_GC); 305 clear_opt(sbi, FORCE_FG_GC); 306 } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) { 307 clear_opt(sbi, BG_GC); 308 clear_opt(sbi, FORCE_FG_GC); 309 } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) { 310 set_opt(sbi, BG_GC); 311 set_opt(sbi, FORCE_FG_GC); 312 } else { 313 kfree(name); 314 return -EINVAL; 315 } 316 kfree(name); 317 break; 318 case Opt_disable_roll_forward: 319 set_opt(sbi, DISABLE_ROLL_FORWARD); 320 break; 321 case Opt_norecovery: 322 /* this option mounts f2fs with ro */ 323 set_opt(sbi, DISABLE_ROLL_FORWARD); 324 if (!f2fs_readonly(sb)) 325 return -EINVAL; 326 break; 327 case Opt_discard: 328 q = bdev_get_queue(sb->s_bdev); 329 if (blk_queue_discard(q)) { 330 set_opt(sbi, DISCARD); 331 } else { 332 f2fs_msg(sb, KERN_WARNING, 333 "mounting with \"discard\" option, but " 334 "the device does not support discard"); 335 } 336 break; 337 case Opt_noheap: 338 set_opt(sbi, NOHEAP); 339 break; 340 #ifdef CONFIG_F2FS_FS_XATTR 341 case Opt_user_xattr: 342 set_opt(sbi, XATTR_USER); 343 break; 344 case Opt_nouser_xattr: 345 clear_opt(sbi, XATTR_USER); 346 break; 347 case Opt_inline_xattr: 348 set_opt(sbi, INLINE_XATTR); 349 break; 350 #else 351 case Opt_user_xattr: 352 f2fs_msg(sb, KERN_INFO, 353 "user_xattr options not supported"); 354 break; 355 case Opt_nouser_xattr: 356 f2fs_msg(sb, KERN_INFO, 357 "nouser_xattr options not supported"); 358 break; 359 case Opt_inline_xattr: 360 f2fs_msg(sb, KERN_INFO, 361 "inline_xattr options not supported"); 362 break; 363 #endif 364 #ifdef CONFIG_F2FS_FS_POSIX_ACL 365 case Opt_acl: 366 set_opt(sbi, POSIX_ACL); 367 break; 368 case Opt_noacl: 369 clear_opt(sbi, POSIX_ACL); 370 break; 371 #else 372 case Opt_acl: 373 f2fs_msg(sb, KERN_INFO, "acl options not supported"); 374 break; 375 case Opt_noacl: 376 f2fs_msg(sb, KERN_INFO, "noacl options not supported"); 377 break; 378 #endif 379 case Opt_active_logs: 380 if (args->from && match_int(args, &arg)) 381 return -EINVAL; 382 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) 383 return -EINVAL; 384 sbi->active_logs = arg; 385 break; 386 case Opt_disable_ext_identify: 387 set_opt(sbi, DISABLE_EXT_IDENTIFY); 388 break; 389 case Opt_inline_data: 390 set_opt(sbi, INLINE_DATA); 391 break; 392 case Opt_inline_dentry: 393 set_opt(sbi, INLINE_DENTRY); 394 break; 395 case Opt_flush_merge: 396 set_opt(sbi, FLUSH_MERGE); 397 break; 398 case Opt_nobarrier: 399 set_opt(sbi, NOBARRIER); 400 break; 401 case Opt_fastboot: 402 set_opt(sbi, FASTBOOT); 403 break; 404 case Opt_extent_cache: 405 set_opt(sbi, EXTENT_CACHE); 406 break; 407 case Opt_noextent_cache: 408 clear_opt(sbi, EXTENT_CACHE); 409 break; 410 case Opt_noinline_data: 411 clear_opt(sbi, INLINE_DATA); 412 break; 413 case Opt_data_flush: 414 set_opt(sbi, DATA_FLUSH); 415 break; 416 default: 417 f2fs_msg(sb, KERN_ERR, 418 "Unrecognized mount option \"%s\" or missing value", 419 p); 420 return -EINVAL; 421 } 422 } 423 return 0; 424 } 425 426 static struct inode *f2fs_alloc_inode(struct super_block *sb) 427 { 428 struct f2fs_inode_info *fi; 429 430 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO); 431 if (!fi) 432 return NULL; 433 434 init_once((void *) fi); 435 436 /* Initialize f2fs-specific inode info */ 437 fi->vfs_inode.i_version = 1; 438 atomic_set(&fi->dirty_pages, 0); 439 fi->i_current_depth = 1; 440 fi->i_advise = 0; 441 init_rwsem(&fi->i_sem); 442 INIT_LIST_HEAD(&fi->dirty_list); 443 INIT_LIST_HEAD(&fi->inmem_pages); 444 mutex_init(&fi->inmem_lock); 445 446 set_inode_flag(fi, FI_NEW_INODE); 447 448 if (test_opt(F2FS_SB(sb), INLINE_XATTR)) 449 set_inode_flag(fi, FI_INLINE_XATTR); 450 451 /* Will be used by directory only */ 452 fi->i_dir_level = F2FS_SB(sb)->dir_level; 453 454 #ifdef CONFIG_F2FS_FS_ENCRYPTION 455 fi->i_crypt_info = NULL; 456 #endif 457 return &fi->vfs_inode; 458 } 459 460 static int f2fs_drop_inode(struct inode *inode) 461 { 462 /* 463 * This is to avoid a deadlock condition like below. 464 * writeback_single_inode(inode) 465 * - f2fs_write_data_page 466 * - f2fs_gc -> iput -> evict 467 * - inode_wait_for_writeback(inode) 468 */ 469 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) { 470 if (!inode->i_nlink && !is_bad_inode(inode)) { 471 /* to avoid evict_inode call simultaneously */ 472 atomic_inc(&inode->i_count); 473 spin_unlock(&inode->i_lock); 474 475 /* some remained atomic pages should discarded */ 476 if (f2fs_is_atomic_file(inode)) 477 commit_inmem_pages(inode, true); 478 479 /* should remain fi->extent_tree for writepage */ 480 f2fs_destroy_extent_node(inode); 481 482 sb_start_intwrite(inode->i_sb); 483 i_size_write(inode, 0); 484 485 if (F2FS_HAS_BLOCKS(inode)) 486 f2fs_truncate(inode, true); 487 488 sb_end_intwrite(inode->i_sb); 489 490 #ifdef CONFIG_F2FS_FS_ENCRYPTION 491 if (F2FS_I(inode)->i_crypt_info) 492 f2fs_free_encryption_info(inode, 493 F2FS_I(inode)->i_crypt_info); 494 #endif 495 spin_lock(&inode->i_lock); 496 atomic_dec(&inode->i_count); 497 } 498 return 0; 499 } 500 return generic_drop_inode(inode); 501 } 502 503 /* 504 * f2fs_dirty_inode() is called from __mark_inode_dirty() 505 * 506 * We should call set_dirty_inode to write the dirty inode through write_inode. 507 */ 508 static void f2fs_dirty_inode(struct inode *inode, int flags) 509 { 510 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE); 511 } 512 513 static void f2fs_i_callback(struct rcu_head *head) 514 { 515 struct inode *inode = container_of(head, struct inode, i_rcu); 516 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); 517 } 518 519 static void f2fs_destroy_inode(struct inode *inode) 520 { 521 call_rcu(&inode->i_rcu, f2fs_i_callback); 522 } 523 524 static void f2fs_put_super(struct super_block *sb) 525 { 526 struct f2fs_sb_info *sbi = F2FS_SB(sb); 527 528 if (sbi->s_proc) { 529 remove_proc_entry("segment_info", sbi->s_proc); 530 remove_proc_entry(sb->s_id, f2fs_proc_root); 531 } 532 kobject_del(&sbi->s_kobj); 533 534 stop_gc_thread(sbi); 535 536 /* prevent remaining shrinker jobs */ 537 mutex_lock(&sbi->umount_mutex); 538 539 /* 540 * We don't need to do checkpoint when superblock is clean. 541 * But, the previous checkpoint was not done by umount, it needs to do 542 * clean checkpoint again. 543 */ 544 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) || 545 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) { 546 struct cp_control cpc = { 547 .reason = CP_UMOUNT, 548 }; 549 write_checkpoint(sbi, &cpc); 550 } 551 552 /* write_checkpoint can update stat informaion */ 553 f2fs_destroy_stats(sbi); 554 555 /* 556 * normally superblock is clean, so we need to release this. 557 * In addition, EIO will skip do checkpoint, we need this as well. 558 */ 559 release_ino_entry(sbi); 560 release_discard_addrs(sbi); 561 562 f2fs_leave_shrinker(sbi); 563 mutex_unlock(&sbi->umount_mutex); 564 565 iput(sbi->node_inode); 566 iput(sbi->meta_inode); 567 568 /* destroy f2fs internal modules */ 569 destroy_node_manager(sbi); 570 destroy_segment_manager(sbi); 571 572 kfree(sbi->ckpt); 573 kobject_put(&sbi->s_kobj); 574 wait_for_completion(&sbi->s_kobj_unregister); 575 576 sb->s_fs_info = NULL; 577 kfree(sbi->raw_super); 578 kfree(sbi); 579 } 580 581 int f2fs_sync_fs(struct super_block *sb, int sync) 582 { 583 struct f2fs_sb_info *sbi = F2FS_SB(sb); 584 int err = 0; 585 586 trace_f2fs_sync_fs(sb, sync); 587 588 if (sync) { 589 struct cp_control cpc; 590 591 cpc.reason = __get_cp_reason(sbi); 592 593 mutex_lock(&sbi->gc_mutex); 594 err = write_checkpoint(sbi, &cpc); 595 mutex_unlock(&sbi->gc_mutex); 596 } 597 f2fs_trace_ios(NULL, 1); 598 599 return err; 600 } 601 602 static int f2fs_freeze(struct super_block *sb) 603 { 604 int err; 605 606 if (f2fs_readonly(sb)) 607 return 0; 608 609 err = f2fs_sync_fs(sb, 1); 610 return err; 611 } 612 613 static int f2fs_unfreeze(struct super_block *sb) 614 { 615 return 0; 616 } 617 618 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) 619 { 620 struct super_block *sb = dentry->d_sb; 621 struct f2fs_sb_info *sbi = F2FS_SB(sb); 622 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 623 block_t total_count, user_block_count, start_count, ovp_count; 624 625 total_count = le64_to_cpu(sbi->raw_super->block_count); 626 user_block_count = sbi->user_block_count; 627 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); 628 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; 629 buf->f_type = F2FS_SUPER_MAGIC; 630 buf->f_bsize = sbi->blocksize; 631 632 buf->f_blocks = total_count - start_count; 633 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; 634 buf->f_bavail = user_block_count - valid_user_blocks(sbi); 635 636 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; 637 buf->f_ffree = buf->f_files - valid_inode_count(sbi); 638 639 buf->f_namelen = F2FS_NAME_LEN; 640 buf->f_fsid.val[0] = (u32)id; 641 buf->f_fsid.val[1] = (u32)(id >> 32); 642 643 return 0; 644 } 645 646 static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 647 { 648 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); 649 650 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) { 651 if (test_opt(sbi, FORCE_FG_GC)) 652 seq_printf(seq, ",background_gc=%s", "sync"); 653 else 654 seq_printf(seq, ",background_gc=%s", "on"); 655 } else { 656 seq_printf(seq, ",background_gc=%s", "off"); 657 } 658 if (test_opt(sbi, DISABLE_ROLL_FORWARD)) 659 seq_puts(seq, ",disable_roll_forward"); 660 if (test_opt(sbi, DISCARD)) 661 seq_puts(seq, ",discard"); 662 if (test_opt(sbi, NOHEAP)) 663 seq_puts(seq, ",no_heap_alloc"); 664 #ifdef CONFIG_F2FS_FS_XATTR 665 if (test_opt(sbi, XATTR_USER)) 666 seq_puts(seq, ",user_xattr"); 667 else 668 seq_puts(seq, ",nouser_xattr"); 669 if (test_opt(sbi, INLINE_XATTR)) 670 seq_puts(seq, ",inline_xattr"); 671 #endif 672 #ifdef CONFIG_F2FS_FS_POSIX_ACL 673 if (test_opt(sbi, POSIX_ACL)) 674 seq_puts(seq, ",acl"); 675 else 676 seq_puts(seq, ",noacl"); 677 #endif 678 if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) 679 seq_puts(seq, ",disable_ext_identify"); 680 if (test_opt(sbi, INLINE_DATA)) 681 seq_puts(seq, ",inline_data"); 682 else 683 seq_puts(seq, ",noinline_data"); 684 if (test_opt(sbi, INLINE_DENTRY)) 685 seq_puts(seq, ",inline_dentry"); 686 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE)) 687 seq_puts(seq, ",flush_merge"); 688 if (test_opt(sbi, NOBARRIER)) 689 seq_puts(seq, ",nobarrier"); 690 if (test_opt(sbi, FASTBOOT)) 691 seq_puts(seq, ",fastboot"); 692 if (test_opt(sbi, EXTENT_CACHE)) 693 seq_puts(seq, ",extent_cache"); 694 else 695 seq_puts(seq, ",noextent_cache"); 696 if (test_opt(sbi, DATA_FLUSH)) 697 seq_puts(seq, ",data_flush"); 698 seq_printf(seq, ",active_logs=%u", sbi->active_logs); 699 700 return 0; 701 } 702 703 static int segment_info_seq_show(struct seq_file *seq, void *offset) 704 { 705 struct super_block *sb = seq->private; 706 struct f2fs_sb_info *sbi = F2FS_SB(sb); 707 unsigned int total_segs = 708 le32_to_cpu(sbi->raw_super->segment_count_main); 709 int i; 710 711 seq_puts(seq, "format: segment_type|valid_blocks\n" 712 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n"); 713 714 for (i = 0; i < total_segs; i++) { 715 struct seg_entry *se = get_seg_entry(sbi, i); 716 717 if ((i % 10) == 0) 718 seq_printf(seq, "%-10d", i); 719 seq_printf(seq, "%d|%-3u", se->type, 720 get_valid_blocks(sbi, i, 1)); 721 if ((i % 10) == 9 || i == (total_segs - 1)) 722 seq_putc(seq, '\n'); 723 else 724 seq_putc(seq, ' '); 725 } 726 727 return 0; 728 } 729 730 static int segment_info_open_fs(struct inode *inode, struct file *file) 731 { 732 return single_open(file, segment_info_seq_show, PDE_DATA(inode)); 733 } 734 735 static const struct file_operations f2fs_seq_segment_info_fops = { 736 .owner = THIS_MODULE, 737 .open = segment_info_open_fs, 738 .read = seq_read, 739 .llseek = seq_lseek, 740 .release = single_release, 741 }; 742 743 static void default_options(struct f2fs_sb_info *sbi) 744 { 745 /* init some FS parameters */ 746 sbi->active_logs = NR_CURSEG_TYPE; 747 748 set_opt(sbi, BG_GC); 749 set_opt(sbi, INLINE_DATA); 750 set_opt(sbi, EXTENT_CACHE); 751 752 #ifdef CONFIG_F2FS_FS_XATTR 753 set_opt(sbi, XATTR_USER); 754 #endif 755 #ifdef CONFIG_F2FS_FS_POSIX_ACL 756 set_opt(sbi, POSIX_ACL); 757 #endif 758 } 759 760 static int f2fs_remount(struct super_block *sb, int *flags, char *data) 761 { 762 struct f2fs_sb_info *sbi = F2FS_SB(sb); 763 struct f2fs_mount_info org_mount_opt; 764 int err, active_logs; 765 bool need_restart_gc = false; 766 bool need_stop_gc = false; 767 bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE); 768 769 sync_filesystem(sb); 770 771 /* 772 * Save the old mount options in case we 773 * need to restore them. 774 */ 775 org_mount_opt = sbi->mount_opt; 776 active_logs = sbi->active_logs; 777 778 sbi->mount_opt.opt = 0; 779 default_options(sbi); 780 781 /* parse mount options */ 782 err = parse_options(sb, data); 783 if (err) 784 goto restore_opts; 785 786 /* 787 * Previous and new state of filesystem is RO, 788 * so skip checking GC and FLUSH_MERGE conditions. 789 */ 790 if (f2fs_readonly(sb) && (*flags & MS_RDONLY)) 791 goto skip; 792 793 /* disallow enable/disable extent_cache dynamically */ 794 if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) { 795 err = -EINVAL; 796 f2fs_msg(sbi->sb, KERN_WARNING, 797 "switch extent_cache option is not allowed"); 798 goto restore_opts; 799 } 800 801 /* 802 * We stop the GC thread if FS is mounted as RO 803 * or if background_gc = off is passed in mount 804 * option. Also sync the filesystem. 805 */ 806 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) { 807 if (sbi->gc_thread) { 808 stop_gc_thread(sbi); 809 f2fs_sync_fs(sb, 1); 810 need_restart_gc = true; 811 } 812 } else if (!sbi->gc_thread) { 813 err = start_gc_thread(sbi); 814 if (err) 815 goto restore_opts; 816 need_stop_gc = true; 817 } 818 819 /* 820 * We stop issue flush thread if FS is mounted as RO 821 * or if flush_merge is not passed in mount option. 822 */ 823 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) { 824 destroy_flush_cmd_control(sbi); 825 } else if (!SM_I(sbi)->cmd_control_info) { 826 err = create_flush_cmd_control(sbi); 827 if (err) 828 goto restore_gc; 829 } 830 skip: 831 /* Update the POSIXACL Flag */ 832 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 833 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 834 return 0; 835 restore_gc: 836 if (need_restart_gc) { 837 if (start_gc_thread(sbi)) 838 f2fs_msg(sbi->sb, KERN_WARNING, 839 "background gc thread has stopped"); 840 } else if (need_stop_gc) { 841 stop_gc_thread(sbi); 842 } 843 restore_opts: 844 sbi->mount_opt = org_mount_opt; 845 sbi->active_logs = active_logs; 846 return err; 847 } 848 849 static struct super_operations f2fs_sops = { 850 .alloc_inode = f2fs_alloc_inode, 851 .drop_inode = f2fs_drop_inode, 852 .destroy_inode = f2fs_destroy_inode, 853 .write_inode = f2fs_write_inode, 854 .dirty_inode = f2fs_dirty_inode, 855 .show_options = f2fs_show_options, 856 .evict_inode = f2fs_evict_inode, 857 .put_super = f2fs_put_super, 858 .sync_fs = f2fs_sync_fs, 859 .freeze_fs = f2fs_freeze, 860 .unfreeze_fs = f2fs_unfreeze, 861 .statfs = f2fs_statfs, 862 .remount_fs = f2fs_remount, 863 }; 864 865 static struct inode *f2fs_nfs_get_inode(struct super_block *sb, 866 u64 ino, u32 generation) 867 { 868 struct f2fs_sb_info *sbi = F2FS_SB(sb); 869 struct inode *inode; 870 871 if (check_nid_range(sbi, ino)) 872 return ERR_PTR(-ESTALE); 873 874 /* 875 * f2fs_iget isn't quite right if the inode is currently unallocated! 876 * However f2fs_iget currently does appropriate checks to handle stale 877 * inodes so everything is OK. 878 */ 879 inode = f2fs_iget(sb, ino); 880 if (IS_ERR(inode)) 881 return ERR_CAST(inode); 882 if (unlikely(generation && inode->i_generation != generation)) { 883 /* we didn't find the right inode.. */ 884 iput(inode); 885 return ERR_PTR(-ESTALE); 886 } 887 return inode; 888 } 889 890 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, 891 int fh_len, int fh_type) 892 { 893 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 894 f2fs_nfs_get_inode); 895 } 896 897 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, 898 int fh_len, int fh_type) 899 { 900 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 901 f2fs_nfs_get_inode); 902 } 903 904 static const struct export_operations f2fs_export_ops = { 905 .fh_to_dentry = f2fs_fh_to_dentry, 906 .fh_to_parent = f2fs_fh_to_parent, 907 .get_parent = f2fs_get_parent, 908 }; 909 910 static loff_t max_file_blocks(void) 911 { 912 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS); 913 loff_t leaf_count = ADDRS_PER_BLOCK; 914 915 /* two direct node blocks */ 916 result += (leaf_count * 2); 917 918 /* two indirect node blocks */ 919 leaf_count *= NIDS_PER_BLOCK; 920 result += (leaf_count * 2); 921 922 /* one double indirect node block */ 923 leaf_count *= NIDS_PER_BLOCK; 924 result += leaf_count; 925 926 return result; 927 } 928 929 static inline bool sanity_check_area_boundary(struct super_block *sb, 930 struct f2fs_super_block *raw_super) 931 { 932 u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr); 933 u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr); 934 u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr); 935 u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr); 936 u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr); 937 u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr); 938 u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt); 939 u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit); 940 u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat); 941 u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa); 942 u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main); 943 u32 segment_count = le32_to_cpu(raw_super->segment_count); 944 u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 945 946 if (segment0_blkaddr != cp_blkaddr) { 947 f2fs_msg(sb, KERN_INFO, 948 "Mismatch start address, segment0(%u) cp_blkaddr(%u)", 949 segment0_blkaddr, cp_blkaddr); 950 return true; 951 } 952 953 if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) != 954 sit_blkaddr) { 955 f2fs_msg(sb, KERN_INFO, 956 "Wrong CP boundary, start(%u) end(%u) blocks(%u)", 957 cp_blkaddr, sit_blkaddr, 958 segment_count_ckpt << log_blocks_per_seg); 959 return true; 960 } 961 962 if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) != 963 nat_blkaddr) { 964 f2fs_msg(sb, KERN_INFO, 965 "Wrong SIT boundary, start(%u) end(%u) blocks(%u)", 966 sit_blkaddr, nat_blkaddr, 967 segment_count_sit << log_blocks_per_seg); 968 return true; 969 } 970 971 if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) != 972 ssa_blkaddr) { 973 f2fs_msg(sb, KERN_INFO, 974 "Wrong NAT boundary, start(%u) end(%u) blocks(%u)", 975 nat_blkaddr, ssa_blkaddr, 976 segment_count_nat << log_blocks_per_seg); 977 return true; 978 } 979 980 if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) != 981 main_blkaddr) { 982 f2fs_msg(sb, KERN_INFO, 983 "Wrong SSA boundary, start(%u) end(%u) blocks(%u)", 984 ssa_blkaddr, main_blkaddr, 985 segment_count_ssa << log_blocks_per_seg); 986 return true; 987 } 988 989 if (main_blkaddr + (segment_count_main << log_blocks_per_seg) != 990 segment0_blkaddr + (segment_count << log_blocks_per_seg)) { 991 f2fs_msg(sb, KERN_INFO, 992 "Wrong MAIN_AREA boundary, start(%u) end(%u) blocks(%u)", 993 main_blkaddr, 994 segment0_blkaddr + (segment_count << log_blocks_per_seg), 995 segment_count_main << log_blocks_per_seg); 996 return true; 997 } 998 999 return false; 1000 } 1001 1002 static int sanity_check_raw_super(struct super_block *sb, 1003 struct f2fs_super_block *raw_super) 1004 { 1005 unsigned int blocksize; 1006 1007 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { 1008 f2fs_msg(sb, KERN_INFO, 1009 "Magic Mismatch, valid(0x%x) - read(0x%x)", 1010 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); 1011 return 1; 1012 } 1013 1014 /* Currently, support only 4KB page cache size */ 1015 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { 1016 f2fs_msg(sb, KERN_INFO, 1017 "Invalid page_cache_size (%lu), supports only 4KB\n", 1018 PAGE_CACHE_SIZE); 1019 return 1; 1020 } 1021 1022 /* Currently, support only 4KB block size */ 1023 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); 1024 if (blocksize != F2FS_BLKSIZE) { 1025 f2fs_msg(sb, KERN_INFO, 1026 "Invalid blocksize (%u), supports only 4KB\n", 1027 blocksize); 1028 return 1; 1029 } 1030 1031 /* check log blocks per segment */ 1032 if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) { 1033 f2fs_msg(sb, KERN_INFO, 1034 "Invalid log blocks per segment (%u)\n", 1035 le32_to_cpu(raw_super->log_blocks_per_seg)); 1036 return 1; 1037 } 1038 1039 /* Currently, support 512/1024/2048/4096 bytes sector size */ 1040 if (le32_to_cpu(raw_super->log_sectorsize) > 1041 F2FS_MAX_LOG_SECTOR_SIZE || 1042 le32_to_cpu(raw_super->log_sectorsize) < 1043 F2FS_MIN_LOG_SECTOR_SIZE) { 1044 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)", 1045 le32_to_cpu(raw_super->log_sectorsize)); 1046 return 1; 1047 } 1048 if (le32_to_cpu(raw_super->log_sectors_per_block) + 1049 le32_to_cpu(raw_super->log_sectorsize) != 1050 F2FS_MAX_LOG_SECTOR_SIZE) { 1051 f2fs_msg(sb, KERN_INFO, 1052 "Invalid log sectors per block(%u) log sectorsize(%u)", 1053 le32_to_cpu(raw_super->log_sectors_per_block), 1054 le32_to_cpu(raw_super->log_sectorsize)); 1055 return 1; 1056 } 1057 1058 /* check reserved ino info */ 1059 if (le32_to_cpu(raw_super->node_ino) != 1 || 1060 le32_to_cpu(raw_super->meta_ino) != 2 || 1061 le32_to_cpu(raw_super->root_ino) != 3) { 1062 f2fs_msg(sb, KERN_INFO, 1063 "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)", 1064 le32_to_cpu(raw_super->node_ino), 1065 le32_to_cpu(raw_super->meta_ino), 1066 le32_to_cpu(raw_super->root_ino)); 1067 return 1; 1068 } 1069 1070 /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */ 1071 if (sanity_check_area_boundary(sb, raw_super)) 1072 return 1; 1073 1074 return 0; 1075 } 1076 1077 static int sanity_check_ckpt(struct f2fs_sb_info *sbi) 1078 { 1079 unsigned int total, fsmeta; 1080 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); 1081 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 1082 1083 total = le32_to_cpu(raw_super->segment_count); 1084 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); 1085 fsmeta += le32_to_cpu(raw_super->segment_count_sit); 1086 fsmeta += le32_to_cpu(raw_super->segment_count_nat); 1087 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); 1088 fsmeta += le32_to_cpu(raw_super->segment_count_ssa); 1089 1090 if (unlikely(fsmeta >= total)) 1091 return 1; 1092 1093 if (unlikely(f2fs_cp_error(sbi))) { 1094 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); 1095 return 1; 1096 } 1097 return 0; 1098 } 1099 1100 static void init_sb_info(struct f2fs_sb_info *sbi) 1101 { 1102 struct f2fs_super_block *raw_super = sbi->raw_super; 1103 int i; 1104 1105 sbi->log_sectors_per_block = 1106 le32_to_cpu(raw_super->log_sectors_per_block); 1107 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); 1108 sbi->blocksize = 1 << sbi->log_blocksize; 1109 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 1110 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; 1111 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); 1112 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); 1113 sbi->total_sections = le32_to_cpu(raw_super->section_count); 1114 sbi->total_node_count = 1115 (le32_to_cpu(raw_super->segment_count_nat) / 2) 1116 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; 1117 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); 1118 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); 1119 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); 1120 sbi->cur_victim_sec = NULL_SECNO; 1121 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH; 1122 1123 for (i = 0; i < NR_COUNT_TYPE; i++) 1124 atomic_set(&sbi->nr_pages[i], 0); 1125 1126 sbi->dir_level = DEF_DIR_LEVEL; 1127 sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL; 1128 sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL; 1129 clear_sbi_flag(sbi, SBI_NEED_FSCK); 1130 1131 INIT_LIST_HEAD(&sbi->s_list); 1132 mutex_init(&sbi->umount_mutex); 1133 } 1134 1135 /* 1136 * Read f2fs raw super block. 1137 * Because we have two copies of super block, so read the first one at first, 1138 * if the first one is invalid, move to read the second one. 1139 */ 1140 static int read_raw_super_block(struct super_block *sb, 1141 struct f2fs_super_block **raw_super, 1142 int *valid_super_block, int *recovery) 1143 { 1144 int block = 0; 1145 struct buffer_head *bh; 1146 struct f2fs_super_block *super, *buf; 1147 int err = 0; 1148 1149 super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL); 1150 if (!super) 1151 return -ENOMEM; 1152 retry: 1153 bh = sb_bread(sb, block); 1154 if (!bh) { 1155 *recovery = 1; 1156 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock", 1157 block + 1); 1158 err = -EIO; 1159 goto next; 1160 } 1161 1162 buf = (struct f2fs_super_block *)(bh->b_data + F2FS_SUPER_OFFSET); 1163 1164 /* sanity checking of raw super */ 1165 if (sanity_check_raw_super(sb, buf)) { 1166 brelse(bh); 1167 *recovery = 1; 1168 f2fs_msg(sb, KERN_ERR, 1169 "Can't find valid F2FS filesystem in %dth superblock", 1170 block + 1); 1171 err = -EINVAL; 1172 goto next; 1173 } 1174 1175 if (!*raw_super) { 1176 memcpy(super, buf, sizeof(*super)); 1177 *valid_super_block = block; 1178 *raw_super = super; 1179 } 1180 brelse(bh); 1181 1182 next: 1183 /* check the validity of the second superblock */ 1184 if (block == 0) { 1185 block++; 1186 goto retry; 1187 } 1188 1189 /* No valid superblock */ 1190 if (!*raw_super) { 1191 kfree(super); 1192 return err; 1193 } 1194 1195 return 0; 1196 } 1197 1198 static int __f2fs_commit_super(struct f2fs_sb_info *sbi, int block) 1199 { 1200 struct f2fs_super_block *super = F2FS_RAW_SUPER(sbi); 1201 struct buffer_head *bh; 1202 int err; 1203 1204 bh = sb_getblk(sbi->sb, block); 1205 if (!bh) 1206 return -EIO; 1207 1208 lock_buffer(bh); 1209 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super)); 1210 set_buffer_uptodate(bh); 1211 set_buffer_dirty(bh); 1212 unlock_buffer(bh); 1213 1214 /* it's rare case, we can do fua all the time */ 1215 err = __sync_dirty_buffer(bh, WRITE_FLUSH_FUA); 1216 brelse(bh); 1217 1218 return err; 1219 } 1220 1221 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover) 1222 { 1223 int err; 1224 1225 /* write back-up superblock first */ 1226 err = __f2fs_commit_super(sbi, sbi->valid_super_block ? 0 : 1); 1227 1228 /* if we are in recovery path, skip writing valid superblock */ 1229 if (recover || err) 1230 return err; 1231 1232 /* write current valid superblock */ 1233 return __f2fs_commit_super(sbi, sbi->valid_super_block); 1234 } 1235 1236 static int f2fs_fill_super(struct super_block *sb, void *data, int silent) 1237 { 1238 struct f2fs_sb_info *sbi; 1239 struct f2fs_super_block *raw_super; 1240 struct inode *root; 1241 long err; 1242 bool retry = true, need_fsck = false; 1243 char *options = NULL; 1244 int recovery, i, valid_super_block; 1245 1246 try_onemore: 1247 err = -EINVAL; 1248 raw_super = NULL; 1249 valid_super_block = -1; 1250 recovery = 0; 1251 1252 /* allocate memory for f2fs-specific super block info */ 1253 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); 1254 if (!sbi) 1255 return -ENOMEM; 1256 1257 /* set a block size */ 1258 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) { 1259 f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); 1260 goto free_sbi; 1261 } 1262 1263 err = read_raw_super_block(sb, &raw_super, &valid_super_block, 1264 &recovery); 1265 if (err) 1266 goto free_sbi; 1267 1268 sb->s_fs_info = sbi; 1269 default_options(sbi); 1270 /* parse mount options */ 1271 options = kstrdup((const char *)data, GFP_KERNEL); 1272 if (data && !options) { 1273 err = -ENOMEM; 1274 goto free_sb_buf; 1275 } 1276 1277 err = parse_options(sb, options); 1278 if (err) 1279 goto free_options; 1280 1281 sbi->max_file_blocks = max_file_blocks(); 1282 sb->s_maxbytes = sbi->max_file_blocks << 1283 le32_to_cpu(raw_super->log_blocksize); 1284 sb->s_max_links = F2FS_LINK_MAX; 1285 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1286 1287 sb->s_op = &f2fs_sops; 1288 sb->s_xattr = f2fs_xattr_handlers; 1289 sb->s_export_op = &f2fs_export_ops; 1290 sb->s_magic = F2FS_SUPER_MAGIC; 1291 sb->s_time_gran = 1; 1292 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1293 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 1294 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); 1295 1296 /* init f2fs-specific super block info */ 1297 sbi->sb = sb; 1298 sbi->raw_super = raw_super; 1299 sbi->valid_super_block = valid_super_block; 1300 mutex_init(&sbi->gc_mutex); 1301 mutex_init(&sbi->writepages); 1302 mutex_init(&sbi->cp_mutex); 1303 init_rwsem(&sbi->node_write); 1304 1305 /* disallow all the data/node/meta page writes */ 1306 set_sbi_flag(sbi, SBI_POR_DOING); 1307 spin_lock_init(&sbi->stat_lock); 1308 1309 init_rwsem(&sbi->read_io.io_rwsem); 1310 sbi->read_io.sbi = sbi; 1311 sbi->read_io.bio = NULL; 1312 for (i = 0; i < NR_PAGE_TYPE; i++) { 1313 init_rwsem(&sbi->write_io[i].io_rwsem); 1314 sbi->write_io[i].sbi = sbi; 1315 sbi->write_io[i].bio = NULL; 1316 } 1317 1318 init_rwsem(&sbi->cp_rwsem); 1319 init_waitqueue_head(&sbi->cp_wait); 1320 init_sb_info(sbi); 1321 1322 /* get an inode for meta space */ 1323 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); 1324 if (IS_ERR(sbi->meta_inode)) { 1325 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); 1326 err = PTR_ERR(sbi->meta_inode); 1327 goto free_options; 1328 } 1329 1330 err = get_valid_checkpoint(sbi); 1331 if (err) { 1332 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); 1333 goto free_meta_inode; 1334 } 1335 1336 /* sanity checking of checkpoint */ 1337 err = -EINVAL; 1338 if (sanity_check_ckpt(sbi)) { 1339 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint"); 1340 goto free_cp; 1341 } 1342 1343 sbi->total_valid_node_count = 1344 le32_to_cpu(sbi->ckpt->valid_node_count); 1345 sbi->total_valid_inode_count = 1346 le32_to_cpu(sbi->ckpt->valid_inode_count); 1347 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); 1348 sbi->total_valid_block_count = 1349 le64_to_cpu(sbi->ckpt->valid_block_count); 1350 sbi->last_valid_block_count = sbi->total_valid_block_count; 1351 sbi->alloc_valid_block_count = 0; 1352 for (i = 0; i < NR_INODE_TYPE; i++) { 1353 INIT_LIST_HEAD(&sbi->inode_list[i]); 1354 spin_lock_init(&sbi->inode_lock[i]); 1355 } 1356 1357 init_extent_cache_info(sbi); 1358 1359 init_ino_entry_info(sbi); 1360 1361 /* setup f2fs internal modules */ 1362 err = build_segment_manager(sbi); 1363 if (err) { 1364 f2fs_msg(sb, KERN_ERR, 1365 "Failed to initialize F2FS segment manager"); 1366 goto free_sm; 1367 } 1368 err = build_node_manager(sbi); 1369 if (err) { 1370 f2fs_msg(sb, KERN_ERR, 1371 "Failed to initialize F2FS node manager"); 1372 goto free_nm; 1373 } 1374 1375 build_gc_manager(sbi); 1376 1377 /* get an inode for node space */ 1378 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); 1379 if (IS_ERR(sbi->node_inode)) { 1380 f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); 1381 err = PTR_ERR(sbi->node_inode); 1382 goto free_nm; 1383 } 1384 1385 f2fs_join_shrinker(sbi); 1386 1387 /* if there are nt orphan nodes free them */ 1388 err = recover_orphan_inodes(sbi); 1389 if (err) 1390 goto free_node_inode; 1391 1392 /* read root inode and dentry */ 1393 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); 1394 if (IS_ERR(root)) { 1395 f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); 1396 err = PTR_ERR(root); 1397 goto free_node_inode; 1398 } 1399 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1400 iput(root); 1401 err = -EINVAL; 1402 goto free_node_inode; 1403 } 1404 1405 sb->s_root = d_make_root(root); /* allocate root dentry */ 1406 if (!sb->s_root) { 1407 err = -ENOMEM; 1408 goto free_root_inode; 1409 } 1410 1411 err = f2fs_build_stats(sbi); 1412 if (err) 1413 goto free_root_inode; 1414 1415 if (f2fs_proc_root) 1416 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); 1417 1418 if (sbi->s_proc) 1419 proc_create_data("segment_info", S_IRUGO, sbi->s_proc, 1420 &f2fs_seq_segment_info_fops, sb); 1421 1422 sbi->s_kobj.kset = f2fs_kset; 1423 init_completion(&sbi->s_kobj_unregister); 1424 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, 1425 "%s", sb->s_id); 1426 if (err) 1427 goto free_proc; 1428 1429 /* recover fsynced data */ 1430 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { 1431 /* 1432 * mount should be failed, when device has readonly mode, and 1433 * previous checkpoint was not done by clean system shutdown. 1434 */ 1435 if (bdev_read_only(sb->s_bdev) && 1436 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) { 1437 err = -EROFS; 1438 goto free_kobj; 1439 } 1440 1441 if (need_fsck) 1442 set_sbi_flag(sbi, SBI_NEED_FSCK); 1443 1444 err = recover_fsync_data(sbi); 1445 if (err) { 1446 need_fsck = true; 1447 f2fs_msg(sb, KERN_ERR, 1448 "Cannot recover all fsync data errno=%ld", err); 1449 goto free_kobj; 1450 } 1451 } 1452 /* recover_fsync_data() cleared this already */ 1453 clear_sbi_flag(sbi, SBI_POR_DOING); 1454 1455 /* 1456 * If filesystem is not mounted as read-only then 1457 * do start the gc_thread. 1458 */ 1459 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) { 1460 /* After POR, we can run background GC thread.*/ 1461 err = start_gc_thread(sbi); 1462 if (err) 1463 goto free_kobj; 1464 } 1465 kfree(options); 1466 1467 /* recover broken superblock */ 1468 if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) { 1469 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock"); 1470 f2fs_commit_super(sbi, true); 1471 } 1472 1473 f2fs_update_time(sbi, CP_TIME); 1474 f2fs_update_time(sbi, REQ_TIME); 1475 return 0; 1476 1477 free_kobj: 1478 kobject_del(&sbi->s_kobj); 1479 kobject_put(&sbi->s_kobj); 1480 wait_for_completion(&sbi->s_kobj_unregister); 1481 free_proc: 1482 if (sbi->s_proc) { 1483 remove_proc_entry("segment_info", sbi->s_proc); 1484 remove_proc_entry(sb->s_id, f2fs_proc_root); 1485 } 1486 f2fs_destroy_stats(sbi); 1487 free_root_inode: 1488 dput(sb->s_root); 1489 sb->s_root = NULL; 1490 free_node_inode: 1491 mutex_lock(&sbi->umount_mutex); 1492 f2fs_leave_shrinker(sbi); 1493 iput(sbi->node_inode); 1494 mutex_unlock(&sbi->umount_mutex); 1495 free_nm: 1496 destroy_node_manager(sbi); 1497 free_sm: 1498 destroy_segment_manager(sbi); 1499 free_cp: 1500 kfree(sbi->ckpt); 1501 free_meta_inode: 1502 make_bad_inode(sbi->meta_inode); 1503 iput(sbi->meta_inode); 1504 free_options: 1505 kfree(options); 1506 free_sb_buf: 1507 kfree(raw_super); 1508 free_sbi: 1509 kfree(sbi); 1510 1511 /* give only one another chance */ 1512 if (retry) { 1513 retry = false; 1514 shrink_dcache_sb(sb); 1515 goto try_onemore; 1516 } 1517 return err; 1518 } 1519 1520 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, 1521 const char *dev_name, void *data) 1522 { 1523 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); 1524 } 1525 1526 static void kill_f2fs_super(struct super_block *sb) 1527 { 1528 if (sb->s_root) 1529 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE); 1530 kill_block_super(sb); 1531 } 1532 1533 static struct file_system_type f2fs_fs_type = { 1534 .owner = THIS_MODULE, 1535 .name = "f2fs", 1536 .mount = f2fs_mount, 1537 .kill_sb = kill_f2fs_super, 1538 .fs_flags = FS_REQUIRES_DEV, 1539 }; 1540 MODULE_ALIAS_FS("f2fs"); 1541 1542 static int __init init_inodecache(void) 1543 { 1544 f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache", 1545 sizeof(struct f2fs_inode_info), 0, 1546 SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL); 1547 if (!f2fs_inode_cachep) 1548 return -ENOMEM; 1549 return 0; 1550 } 1551 1552 static void destroy_inodecache(void) 1553 { 1554 /* 1555 * Make sure all delayed rcu free inodes are flushed before we 1556 * destroy cache. 1557 */ 1558 rcu_barrier(); 1559 kmem_cache_destroy(f2fs_inode_cachep); 1560 } 1561 1562 static int __init init_f2fs_fs(void) 1563 { 1564 int err; 1565 1566 f2fs_build_trace_ios(); 1567 1568 err = init_inodecache(); 1569 if (err) 1570 goto fail; 1571 err = create_node_manager_caches(); 1572 if (err) 1573 goto free_inodecache; 1574 err = create_segment_manager_caches(); 1575 if (err) 1576 goto free_node_manager_caches; 1577 err = create_checkpoint_caches(); 1578 if (err) 1579 goto free_segment_manager_caches; 1580 err = create_extent_cache(); 1581 if (err) 1582 goto free_checkpoint_caches; 1583 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); 1584 if (!f2fs_kset) { 1585 err = -ENOMEM; 1586 goto free_extent_cache; 1587 } 1588 err = f2fs_init_crypto(); 1589 if (err) 1590 goto free_kset; 1591 1592 err = register_shrinker(&f2fs_shrinker_info); 1593 if (err) 1594 goto free_crypto; 1595 1596 err = register_filesystem(&f2fs_fs_type); 1597 if (err) 1598 goto free_shrinker; 1599 err = f2fs_create_root_stats(); 1600 if (err) 1601 goto free_filesystem; 1602 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); 1603 return 0; 1604 1605 free_filesystem: 1606 unregister_filesystem(&f2fs_fs_type); 1607 free_shrinker: 1608 unregister_shrinker(&f2fs_shrinker_info); 1609 free_crypto: 1610 f2fs_exit_crypto(); 1611 free_kset: 1612 kset_unregister(f2fs_kset); 1613 free_extent_cache: 1614 destroy_extent_cache(); 1615 free_checkpoint_caches: 1616 destroy_checkpoint_caches(); 1617 free_segment_manager_caches: 1618 destroy_segment_manager_caches(); 1619 free_node_manager_caches: 1620 destroy_node_manager_caches(); 1621 free_inodecache: 1622 destroy_inodecache(); 1623 fail: 1624 return err; 1625 } 1626 1627 static void __exit exit_f2fs_fs(void) 1628 { 1629 remove_proc_entry("fs/f2fs", NULL); 1630 f2fs_destroy_root_stats(); 1631 unregister_shrinker(&f2fs_shrinker_info); 1632 unregister_filesystem(&f2fs_fs_type); 1633 f2fs_exit_crypto(); 1634 destroy_extent_cache(); 1635 destroy_checkpoint_caches(); 1636 destroy_segment_manager_caches(); 1637 destroy_node_manager_caches(); 1638 destroy_inodecache(); 1639 kset_unregister(f2fs_kset); 1640 f2fs_destroy_trace_ios(); 1641 } 1642 1643 module_init(init_f2fs_fs) 1644 module_exit(exit_f2fs_fs) 1645 1646 MODULE_AUTHOR("Samsung Electronics's Praesto Team"); 1647 MODULE_DESCRIPTION("Flash Friendly File System"); 1648 MODULE_LICENSE("GPL"); 1649