1 /* 2 * fs/f2fs/super.c 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/fs.h> 14 #include <linux/statfs.h> 15 #include <linux/buffer_head.h> 16 #include <linux/backing-dev.h> 17 #include <linux/kthread.h> 18 #include <linux/parser.h> 19 #include <linux/mount.h> 20 #include <linux/seq_file.h> 21 #include <linux/proc_fs.h> 22 #include <linux/random.h> 23 #include <linux/exportfs.h> 24 #include <linux/blkdev.h> 25 #include <linux/f2fs_fs.h> 26 #include <linux/sysfs.h> 27 28 #include "f2fs.h" 29 #include "node.h" 30 #include "segment.h" 31 #include "xattr.h" 32 #include "gc.h" 33 #include "trace.h" 34 35 #define CREATE_TRACE_POINTS 36 #include <trace/events/f2fs.h> 37 38 static struct proc_dir_entry *f2fs_proc_root; 39 static struct kmem_cache *f2fs_inode_cachep; 40 static struct kset *f2fs_kset; 41 42 enum { 43 Opt_gc_background, 44 Opt_disable_roll_forward, 45 Opt_norecovery, 46 Opt_discard, 47 Opt_noheap, 48 Opt_user_xattr, 49 Opt_nouser_xattr, 50 Opt_acl, 51 Opt_noacl, 52 Opt_active_logs, 53 Opt_disable_ext_identify, 54 Opt_inline_xattr, 55 Opt_inline_data, 56 Opt_inline_dentry, 57 Opt_flush_merge, 58 Opt_nobarrier, 59 Opt_fastboot, 60 Opt_extent_cache, 61 Opt_noinline_data, 62 Opt_err, 63 }; 64 65 static match_table_t f2fs_tokens = { 66 {Opt_gc_background, "background_gc=%s"}, 67 {Opt_disable_roll_forward, "disable_roll_forward"}, 68 {Opt_norecovery, "norecovery"}, 69 {Opt_discard, "discard"}, 70 {Opt_noheap, "no_heap"}, 71 {Opt_user_xattr, "user_xattr"}, 72 {Opt_nouser_xattr, "nouser_xattr"}, 73 {Opt_acl, "acl"}, 74 {Opt_noacl, "noacl"}, 75 {Opt_active_logs, "active_logs=%u"}, 76 {Opt_disable_ext_identify, "disable_ext_identify"}, 77 {Opt_inline_xattr, "inline_xattr"}, 78 {Opt_inline_data, "inline_data"}, 79 {Opt_inline_dentry, "inline_dentry"}, 80 {Opt_flush_merge, "flush_merge"}, 81 {Opt_nobarrier, "nobarrier"}, 82 {Opt_fastboot, "fastboot"}, 83 {Opt_extent_cache, "extent_cache"}, 84 {Opt_noinline_data, "noinline_data"}, 85 {Opt_err, NULL}, 86 }; 87 88 /* Sysfs support for f2fs */ 89 enum { 90 GC_THREAD, /* struct f2fs_gc_thread */ 91 SM_INFO, /* struct f2fs_sm_info */ 92 NM_INFO, /* struct f2fs_nm_info */ 93 F2FS_SBI, /* struct f2fs_sb_info */ 94 }; 95 96 struct f2fs_attr { 97 struct attribute attr; 98 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *); 99 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *, 100 const char *, size_t); 101 int struct_type; 102 int offset; 103 }; 104 105 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type) 106 { 107 if (struct_type == GC_THREAD) 108 return (unsigned char *)sbi->gc_thread; 109 else if (struct_type == SM_INFO) 110 return (unsigned char *)SM_I(sbi); 111 else if (struct_type == NM_INFO) 112 return (unsigned char *)NM_I(sbi); 113 else if (struct_type == F2FS_SBI) 114 return (unsigned char *)sbi; 115 return NULL; 116 } 117 118 static ssize_t f2fs_sbi_show(struct f2fs_attr *a, 119 struct f2fs_sb_info *sbi, char *buf) 120 { 121 unsigned char *ptr = NULL; 122 unsigned int *ui; 123 124 ptr = __struct_ptr(sbi, a->struct_type); 125 if (!ptr) 126 return -EINVAL; 127 128 ui = (unsigned int *)(ptr + a->offset); 129 130 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 131 } 132 133 static ssize_t f2fs_sbi_store(struct f2fs_attr *a, 134 struct f2fs_sb_info *sbi, 135 const char *buf, size_t count) 136 { 137 unsigned char *ptr; 138 unsigned long t; 139 unsigned int *ui; 140 ssize_t ret; 141 142 ptr = __struct_ptr(sbi, a->struct_type); 143 if (!ptr) 144 return -EINVAL; 145 146 ui = (unsigned int *)(ptr + a->offset); 147 148 ret = kstrtoul(skip_spaces(buf), 0, &t); 149 if (ret < 0) 150 return ret; 151 *ui = t; 152 return count; 153 } 154 155 static ssize_t f2fs_attr_show(struct kobject *kobj, 156 struct attribute *attr, char *buf) 157 { 158 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 159 s_kobj); 160 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 161 162 return a->show ? a->show(a, sbi, buf) : 0; 163 } 164 165 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr, 166 const char *buf, size_t len) 167 { 168 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 169 s_kobj); 170 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr); 171 172 return a->store ? a->store(a, sbi, buf, len) : 0; 173 } 174 175 static void f2fs_sb_release(struct kobject *kobj) 176 { 177 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info, 178 s_kobj); 179 complete(&sbi->s_kobj_unregister); 180 } 181 182 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \ 183 static struct f2fs_attr f2fs_attr_##_name = { \ 184 .attr = {.name = __stringify(_name), .mode = _mode }, \ 185 .show = _show, \ 186 .store = _store, \ 187 .struct_type = _struct_type, \ 188 .offset = _offset \ 189 } 190 191 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \ 192 F2FS_ATTR_OFFSET(struct_type, name, 0644, \ 193 f2fs_sbi_show, f2fs_sbi_store, \ 194 offsetof(struct struct_name, elname)) 195 196 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time); 197 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time); 198 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time); 199 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle); 200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments); 201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); 202 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections); 203 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 204 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util); 205 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks); 206 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh); 207 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search); 208 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level); 209 210 #define ATTR_LIST(name) (&f2fs_attr_##name.attr) 211 static struct attribute *f2fs_attrs[] = { 212 ATTR_LIST(gc_min_sleep_time), 213 ATTR_LIST(gc_max_sleep_time), 214 ATTR_LIST(gc_no_gc_sleep_time), 215 ATTR_LIST(gc_idle), 216 ATTR_LIST(reclaim_segments), 217 ATTR_LIST(max_small_discards), 218 ATTR_LIST(batched_trim_sections), 219 ATTR_LIST(ipu_policy), 220 ATTR_LIST(min_ipu_util), 221 ATTR_LIST(min_fsync_blocks), 222 ATTR_LIST(max_victim_search), 223 ATTR_LIST(dir_level), 224 ATTR_LIST(ram_thresh), 225 NULL, 226 }; 227 228 static const struct sysfs_ops f2fs_attr_ops = { 229 .show = f2fs_attr_show, 230 .store = f2fs_attr_store, 231 }; 232 233 static struct kobj_type f2fs_ktype = { 234 .default_attrs = f2fs_attrs, 235 .sysfs_ops = &f2fs_attr_ops, 236 .release = f2fs_sb_release, 237 }; 238 239 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...) 240 { 241 struct va_format vaf; 242 va_list args; 243 244 va_start(args, fmt); 245 vaf.fmt = fmt; 246 vaf.va = &args; 247 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf); 248 va_end(args); 249 } 250 251 static void init_once(void *foo) 252 { 253 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo; 254 255 inode_init_once(&fi->vfs_inode); 256 } 257 258 static int parse_options(struct super_block *sb, char *options) 259 { 260 struct f2fs_sb_info *sbi = F2FS_SB(sb); 261 struct request_queue *q; 262 substring_t args[MAX_OPT_ARGS]; 263 char *p, *name; 264 int arg = 0; 265 266 if (!options) 267 return 0; 268 269 while ((p = strsep(&options, ",")) != NULL) { 270 int token; 271 if (!*p) 272 continue; 273 /* 274 * Initialize args struct so we know whether arg was 275 * found; some options take optional arguments. 276 */ 277 args[0].to = args[0].from = NULL; 278 token = match_token(p, f2fs_tokens, args); 279 280 switch (token) { 281 case Opt_gc_background: 282 name = match_strdup(&args[0]); 283 284 if (!name) 285 return -ENOMEM; 286 if (strlen(name) == 2 && !strncmp(name, "on", 2)) 287 set_opt(sbi, BG_GC); 288 else if (strlen(name) == 3 && !strncmp(name, "off", 3)) 289 clear_opt(sbi, BG_GC); 290 else { 291 kfree(name); 292 return -EINVAL; 293 } 294 kfree(name); 295 break; 296 case Opt_disable_roll_forward: 297 set_opt(sbi, DISABLE_ROLL_FORWARD); 298 break; 299 case Opt_norecovery: 300 /* this option mounts f2fs with ro */ 301 set_opt(sbi, DISABLE_ROLL_FORWARD); 302 if (!f2fs_readonly(sb)) 303 return -EINVAL; 304 break; 305 case Opt_discard: 306 q = bdev_get_queue(sb->s_bdev); 307 if (blk_queue_discard(q)) { 308 set_opt(sbi, DISCARD); 309 } else { 310 f2fs_msg(sb, KERN_WARNING, 311 "mounting with \"discard\" option, but " 312 "the device does not support discard"); 313 } 314 break; 315 case Opt_noheap: 316 set_opt(sbi, NOHEAP); 317 break; 318 #ifdef CONFIG_F2FS_FS_XATTR 319 case Opt_user_xattr: 320 set_opt(sbi, XATTR_USER); 321 break; 322 case Opt_nouser_xattr: 323 clear_opt(sbi, XATTR_USER); 324 break; 325 case Opt_inline_xattr: 326 set_opt(sbi, INLINE_XATTR); 327 break; 328 #else 329 case Opt_user_xattr: 330 f2fs_msg(sb, KERN_INFO, 331 "user_xattr options not supported"); 332 break; 333 case Opt_nouser_xattr: 334 f2fs_msg(sb, KERN_INFO, 335 "nouser_xattr options not supported"); 336 break; 337 case Opt_inline_xattr: 338 f2fs_msg(sb, KERN_INFO, 339 "inline_xattr options not supported"); 340 break; 341 #endif 342 #ifdef CONFIG_F2FS_FS_POSIX_ACL 343 case Opt_acl: 344 set_opt(sbi, POSIX_ACL); 345 break; 346 case Opt_noacl: 347 clear_opt(sbi, POSIX_ACL); 348 break; 349 #else 350 case Opt_acl: 351 f2fs_msg(sb, KERN_INFO, "acl options not supported"); 352 break; 353 case Opt_noacl: 354 f2fs_msg(sb, KERN_INFO, "noacl options not supported"); 355 break; 356 #endif 357 case Opt_active_logs: 358 if (args->from && match_int(args, &arg)) 359 return -EINVAL; 360 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE) 361 return -EINVAL; 362 sbi->active_logs = arg; 363 break; 364 case Opt_disable_ext_identify: 365 set_opt(sbi, DISABLE_EXT_IDENTIFY); 366 break; 367 case Opt_inline_data: 368 set_opt(sbi, INLINE_DATA); 369 break; 370 case Opt_inline_dentry: 371 set_opt(sbi, INLINE_DENTRY); 372 break; 373 case Opt_flush_merge: 374 set_opt(sbi, FLUSH_MERGE); 375 break; 376 case Opt_nobarrier: 377 set_opt(sbi, NOBARRIER); 378 break; 379 case Opt_fastboot: 380 set_opt(sbi, FASTBOOT); 381 break; 382 case Opt_extent_cache: 383 set_opt(sbi, EXTENT_CACHE); 384 break; 385 case Opt_noinline_data: 386 clear_opt(sbi, INLINE_DATA); 387 break; 388 default: 389 f2fs_msg(sb, KERN_ERR, 390 "Unrecognized mount option \"%s\" or missing value", 391 p); 392 return -EINVAL; 393 } 394 } 395 return 0; 396 } 397 398 static struct inode *f2fs_alloc_inode(struct super_block *sb) 399 { 400 struct f2fs_inode_info *fi; 401 402 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO); 403 if (!fi) 404 return NULL; 405 406 init_once((void *) fi); 407 408 /* Initialize f2fs-specific inode info */ 409 fi->vfs_inode.i_version = 1; 410 atomic_set(&fi->dirty_pages, 0); 411 fi->i_current_depth = 1; 412 fi->i_advise = 0; 413 rwlock_init(&fi->ext_lock); 414 init_rwsem(&fi->i_sem); 415 INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS); 416 INIT_LIST_HEAD(&fi->inmem_pages); 417 mutex_init(&fi->inmem_lock); 418 419 set_inode_flag(fi, FI_NEW_INODE); 420 421 if (test_opt(F2FS_SB(sb), INLINE_XATTR)) 422 set_inode_flag(fi, FI_INLINE_XATTR); 423 424 /* Will be used by directory only */ 425 fi->i_dir_level = F2FS_SB(sb)->dir_level; 426 427 #ifdef CONFIG_F2FS_FS_ENCRYPTION 428 fi->i_crypt_info = NULL; 429 #endif 430 return &fi->vfs_inode; 431 } 432 433 static int f2fs_drop_inode(struct inode *inode) 434 { 435 /* 436 * This is to avoid a deadlock condition like below. 437 * writeback_single_inode(inode) 438 * - f2fs_write_data_page 439 * - f2fs_gc -> iput -> evict 440 * - inode_wait_for_writeback(inode) 441 */ 442 if (!inode_unhashed(inode) && inode->i_state & I_SYNC) { 443 if (!inode->i_nlink && !is_bad_inode(inode)) { 444 spin_unlock(&inode->i_lock); 445 446 /* some remained atomic pages should discarded */ 447 if (f2fs_is_atomic_file(inode)) 448 commit_inmem_pages(inode, true); 449 450 sb_start_intwrite(inode->i_sb); 451 i_size_write(inode, 0); 452 453 if (F2FS_HAS_BLOCKS(inode)) 454 f2fs_truncate(inode); 455 456 sb_end_intwrite(inode->i_sb); 457 458 #ifdef CONFIG_F2FS_FS_ENCRYPTION 459 if (F2FS_I(inode)->i_crypt_info) 460 f2fs_free_encryption_info(inode, 461 F2FS_I(inode)->i_crypt_info); 462 #endif 463 spin_lock(&inode->i_lock); 464 } 465 return 0; 466 } 467 return generic_drop_inode(inode); 468 } 469 470 /* 471 * f2fs_dirty_inode() is called from __mark_inode_dirty() 472 * 473 * We should call set_dirty_inode to write the dirty inode through write_inode. 474 */ 475 static void f2fs_dirty_inode(struct inode *inode, int flags) 476 { 477 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE); 478 } 479 480 static void f2fs_i_callback(struct rcu_head *head) 481 { 482 struct inode *inode = container_of(head, struct inode, i_rcu); 483 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode)); 484 } 485 486 static void f2fs_destroy_inode(struct inode *inode) 487 { 488 call_rcu(&inode->i_rcu, f2fs_i_callback); 489 } 490 491 static void f2fs_put_super(struct super_block *sb) 492 { 493 struct f2fs_sb_info *sbi = F2FS_SB(sb); 494 495 if (sbi->s_proc) { 496 remove_proc_entry("segment_info", sbi->s_proc); 497 remove_proc_entry(sb->s_id, f2fs_proc_root); 498 } 499 kobject_del(&sbi->s_kobj); 500 501 f2fs_destroy_stats(sbi); 502 stop_gc_thread(sbi); 503 504 /* 505 * We don't need to do checkpoint when superblock is clean. 506 * But, the previous checkpoint was not done by umount, it needs to do 507 * clean checkpoint again. 508 */ 509 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) || 510 !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) { 511 struct cp_control cpc = { 512 .reason = CP_UMOUNT, 513 }; 514 write_checkpoint(sbi, &cpc); 515 } 516 517 /* 518 * normally superblock is clean, so we need to release this. 519 * In addition, EIO will skip do checkpoint, we need this as well. 520 */ 521 release_dirty_inode(sbi); 522 release_discard_addrs(sbi); 523 524 iput(sbi->node_inode); 525 iput(sbi->meta_inode); 526 527 /* destroy f2fs internal modules */ 528 destroy_node_manager(sbi); 529 destroy_segment_manager(sbi); 530 531 kfree(sbi->ckpt); 532 kobject_put(&sbi->s_kobj); 533 wait_for_completion(&sbi->s_kobj_unregister); 534 535 sb->s_fs_info = NULL; 536 brelse(sbi->raw_super_buf); 537 kfree(sbi); 538 } 539 540 int f2fs_sync_fs(struct super_block *sb, int sync) 541 { 542 struct f2fs_sb_info *sbi = F2FS_SB(sb); 543 544 trace_f2fs_sync_fs(sb, sync); 545 546 if (sync) { 547 struct cp_control cpc; 548 549 cpc.reason = __get_cp_reason(sbi); 550 551 mutex_lock(&sbi->gc_mutex); 552 write_checkpoint(sbi, &cpc); 553 mutex_unlock(&sbi->gc_mutex); 554 } else { 555 f2fs_balance_fs(sbi); 556 } 557 f2fs_trace_ios(NULL, 1); 558 559 return 0; 560 } 561 562 static int f2fs_freeze(struct super_block *sb) 563 { 564 int err; 565 566 if (f2fs_readonly(sb)) 567 return 0; 568 569 err = f2fs_sync_fs(sb, 1); 570 return err; 571 } 572 573 static int f2fs_unfreeze(struct super_block *sb) 574 { 575 return 0; 576 } 577 578 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) 579 { 580 struct super_block *sb = dentry->d_sb; 581 struct f2fs_sb_info *sbi = F2FS_SB(sb); 582 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 583 block_t total_count, user_block_count, start_count, ovp_count; 584 585 total_count = le64_to_cpu(sbi->raw_super->block_count); 586 user_block_count = sbi->user_block_count; 587 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr); 588 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg; 589 buf->f_type = F2FS_SUPER_MAGIC; 590 buf->f_bsize = sbi->blocksize; 591 592 buf->f_blocks = total_count - start_count; 593 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count; 594 buf->f_bavail = user_block_count - valid_user_blocks(sbi); 595 596 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; 597 buf->f_ffree = buf->f_files - valid_inode_count(sbi); 598 599 buf->f_namelen = F2FS_NAME_LEN; 600 buf->f_fsid.val[0] = (u32)id; 601 buf->f_fsid.val[1] = (u32)(id >> 32); 602 603 return 0; 604 } 605 606 static int f2fs_show_options(struct seq_file *seq, struct dentry *root) 607 { 608 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb); 609 610 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) 611 seq_printf(seq, ",background_gc=%s", "on"); 612 else 613 seq_printf(seq, ",background_gc=%s", "off"); 614 if (test_opt(sbi, DISABLE_ROLL_FORWARD)) 615 seq_puts(seq, ",disable_roll_forward"); 616 if (test_opt(sbi, DISCARD)) 617 seq_puts(seq, ",discard"); 618 if (test_opt(sbi, NOHEAP)) 619 seq_puts(seq, ",no_heap_alloc"); 620 #ifdef CONFIG_F2FS_FS_XATTR 621 if (test_opt(sbi, XATTR_USER)) 622 seq_puts(seq, ",user_xattr"); 623 else 624 seq_puts(seq, ",nouser_xattr"); 625 if (test_opt(sbi, INLINE_XATTR)) 626 seq_puts(seq, ",inline_xattr"); 627 #endif 628 #ifdef CONFIG_F2FS_FS_POSIX_ACL 629 if (test_opt(sbi, POSIX_ACL)) 630 seq_puts(seq, ",acl"); 631 else 632 seq_puts(seq, ",noacl"); 633 #endif 634 if (test_opt(sbi, DISABLE_EXT_IDENTIFY)) 635 seq_puts(seq, ",disable_ext_identify"); 636 if (test_opt(sbi, INLINE_DATA)) 637 seq_puts(seq, ",inline_data"); 638 else 639 seq_puts(seq, ",noinline_data"); 640 if (test_opt(sbi, INLINE_DENTRY)) 641 seq_puts(seq, ",inline_dentry"); 642 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE)) 643 seq_puts(seq, ",flush_merge"); 644 if (test_opt(sbi, NOBARRIER)) 645 seq_puts(seq, ",nobarrier"); 646 if (test_opt(sbi, FASTBOOT)) 647 seq_puts(seq, ",fastboot"); 648 if (test_opt(sbi, EXTENT_CACHE)) 649 seq_puts(seq, ",extent_cache"); 650 seq_printf(seq, ",active_logs=%u", sbi->active_logs); 651 652 return 0; 653 } 654 655 static int segment_info_seq_show(struct seq_file *seq, void *offset) 656 { 657 struct super_block *sb = seq->private; 658 struct f2fs_sb_info *sbi = F2FS_SB(sb); 659 unsigned int total_segs = 660 le32_to_cpu(sbi->raw_super->segment_count_main); 661 int i; 662 663 seq_puts(seq, "format: segment_type|valid_blocks\n" 664 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n"); 665 666 for (i = 0; i < total_segs; i++) { 667 struct seg_entry *se = get_seg_entry(sbi, i); 668 669 if ((i % 10) == 0) 670 seq_printf(seq, "%-5d", i); 671 seq_printf(seq, "%d|%-3u", se->type, 672 get_valid_blocks(sbi, i, 1)); 673 if ((i % 10) == 9 || i == (total_segs - 1)) 674 seq_putc(seq, '\n'); 675 else 676 seq_putc(seq, ' '); 677 } 678 679 return 0; 680 } 681 682 static int segment_info_open_fs(struct inode *inode, struct file *file) 683 { 684 return single_open(file, segment_info_seq_show, PDE_DATA(inode)); 685 } 686 687 static const struct file_operations f2fs_seq_segment_info_fops = { 688 .owner = THIS_MODULE, 689 .open = segment_info_open_fs, 690 .read = seq_read, 691 .llseek = seq_lseek, 692 .release = single_release, 693 }; 694 695 static void default_options(struct f2fs_sb_info *sbi) 696 { 697 /* init some FS parameters */ 698 sbi->active_logs = NR_CURSEG_TYPE; 699 700 set_opt(sbi, BG_GC); 701 set_opt(sbi, INLINE_DATA); 702 703 #ifdef CONFIG_F2FS_FS_XATTR 704 set_opt(sbi, XATTR_USER); 705 #endif 706 #ifdef CONFIG_F2FS_FS_POSIX_ACL 707 set_opt(sbi, POSIX_ACL); 708 #endif 709 } 710 711 static int f2fs_remount(struct super_block *sb, int *flags, char *data) 712 { 713 struct f2fs_sb_info *sbi = F2FS_SB(sb); 714 struct f2fs_mount_info org_mount_opt; 715 int err, active_logs; 716 bool need_restart_gc = false; 717 bool need_stop_gc = false; 718 719 sync_filesystem(sb); 720 721 /* 722 * Save the old mount options in case we 723 * need to restore them. 724 */ 725 org_mount_opt = sbi->mount_opt; 726 active_logs = sbi->active_logs; 727 728 sbi->mount_opt.opt = 0; 729 default_options(sbi); 730 731 /* parse mount options */ 732 err = parse_options(sb, data); 733 if (err) 734 goto restore_opts; 735 736 /* 737 * Previous and new state of filesystem is RO, 738 * so skip checking GC and FLUSH_MERGE conditions. 739 */ 740 if (f2fs_readonly(sb) && (*flags & MS_RDONLY)) 741 goto skip; 742 743 /* 744 * We stop the GC thread if FS is mounted as RO 745 * or if background_gc = off is passed in mount 746 * option. Also sync the filesystem. 747 */ 748 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) { 749 if (sbi->gc_thread) { 750 stop_gc_thread(sbi); 751 f2fs_sync_fs(sb, 1); 752 need_restart_gc = true; 753 } 754 } else if (!sbi->gc_thread) { 755 err = start_gc_thread(sbi); 756 if (err) 757 goto restore_opts; 758 need_stop_gc = true; 759 } 760 761 /* 762 * We stop issue flush thread if FS is mounted as RO 763 * or if flush_merge is not passed in mount option. 764 */ 765 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) { 766 destroy_flush_cmd_control(sbi); 767 } else if (!SM_I(sbi)->cmd_control_info) { 768 err = create_flush_cmd_control(sbi); 769 if (err) 770 goto restore_gc; 771 } 772 skip: 773 /* Update the POSIXACL Flag */ 774 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 775 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 776 return 0; 777 restore_gc: 778 if (need_restart_gc) { 779 if (start_gc_thread(sbi)) 780 f2fs_msg(sbi->sb, KERN_WARNING, 781 "background gc thread has stopped"); 782 } else if (need_stop_gc) { 783 stop_gc_thread(sbi); 784 } 785 restore_opts: 786 sbi->mount_opt = org_mount_opt; 787 sbi->active_logs = active_logs; 788 return err; 789 } 790 791 static struct super_operations f2fs_sops = { 792 .alloc_inode = f2fs_alloc_inode, 793 .drop_inode = f2fs_drop_inode, 794 .destroy_inode = f2fs_destroy_inode, 795 .write_inode = f2fs_write_inode, 796 .dirty_inode = f2fs_dirty_inode, 797 .show_options = f2fs_show_options, 798 .evict_inode = f2fs_evict_inode, 799 .put_super = f2fs_put_super, 800 .sync_fs = f2fs_sync_fs, 801 .freeze_fs = f2fs_freeze, 802 .unfreeze_fs = f2fs_unfreeze, 803 .statfs = f2fs_statfs, 804 .remount_fs = f2fs_remount, 805 }; 806 807 static struct inode *f2fs_nfs_get_inode(struct super_block *sb, 808 u64 ino, u32 generation) 809 { 810 struct f2fs_sb_info *sbi = F2FS_SB(sb); 811 struct inode *inode; 812 813 if (check_nid_range(sbi, ino)) 814 return ERR_PTR(-ESTALE); 815 816 /* 817 * f2fs_iget isn't quite right if the inode is currently unallocated! 818 * However f2fs_iget currently does appropriate checks to handle stale 819 * inodes so everything is OK. 820 */ 821 inode = f2fs_iget(sb, ino); 822 if (IS_ERR(inode)) 823 return ERR_CAST(inode); 824 if (unlikely(generation && inode->i_generation != generation)) { 825 /* we didn't find the right inode.. */ 826 iput(inode); 827 return ERR_PTR(-ESTALE); 828 } 829 return inode; 830 } 831 832 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid, 833 int fh_len, int fh_type) 834 { 835 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 836 f2fs_nfs_get_inode); 837 } 838 839 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid, 840 int fh_len, int fh_type) 841 { 842 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 843 f2fs_nfs_get_inode); 844 } 845 846 static const struct export_operations f2fs_export_ops = { 847 .fh_to_dentry = f2fs_fh_to_dentry, 848 .fh_to_parent = f2fs_fh_to_parent, 849 .get_parent = f2fs_get_parent, 850 }; 851 852 static loff_t max_file_size(unsigned bits) 853 { 854 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS); 855 loff_t leaf_count = ADDRS_PER_BLOCK; 856 857 /* two direct node blocks */ 858 result += (leaf_count * 2); 859 860 /* two indirect node blocks */ 861 leaf_count *= NIDS_PER_BLOCK; 862 result += (leaf_count * 2); 863 864 /* one double indirect node block */ 865 leaf_count *= NIDS_PER_BLOCK; 866 result += leaf_count; 867 868 result <<= bits; 869 return result; 870 } 871 872 static int sanity_check_raw_super(struct super_block *sb, 873 struct f2fs_super_block *raw_super) 874 { 875 unsigned int blocksize; 876 877 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) { 878 f2fs_msg(sb, KERN_INFO, 879 "Magic Mismatch, valid(0x%x) - read(0x%x)", 880 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic)); 881 return 1; 882 } 883 884 /* Currently, support only 4KB page cache size */ 885 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { 886 f2fs_msg(sb, KERN_INFO, 887 "Invalid page_cache_size (%lu), supports only 4KB\n", 888 PAGE_CACHE_SIZE); 889 return 1; 890 } 891 892 /* Currently, support only 4KB block size */ 893 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize); 894 if (blocksize != F2FS_BLKSIZE) { 895 f2fs_msg(sb, KERN_INFO, 896 "Invalid blocksize (%u), supports only 4KB\n", 897 blocksize); 898 return 1; 899 } 900 901 /* Currently, support 512/1024/2048/4096 bytes sector size */ 902 if (le32_to_cpu(raw_super->log_sectorsize) > 903 F2FS_MAX_LOG_SECTOR_SIZE || 904 le32_to_cpu(raw_super->log_sectorsize) < 905 F2FS_MIN_LOG_SECTOR_SIZE) { 906 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)", 907 le32_to_cpu(raw_super->log_sectorsize)); 908 return 1; 909 } 910 if (le32_to_cpu(raw_super->log_sectors_per_block) + 911 le32_to_cpu(raw_super->log_sectorsize) != 912 F2FS_MAX_LOG_SECTOR_SIZE) { 913 f2fs_msg(sb, KERN_INFO, 914 "Invalid log sectors per block(%u) log sectorsize(%u)", 915 le32_to_cpu(raw_super->log_sectors_per_block), 916 le32_to_cpu(raw_super->log_sectorsize)); 917 return 1; 918 } 919 return 0; 920 } 921 922 static int sanity_check_ckpt(struct f2fs_sb_info *sbi) 923 { 924 unsigned int total, fsmeta; 925 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi); 926 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); 927 928 total = le32_to_cpu(raw_super->segment_count); 929 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt); 930 fsmeta += le32_to_cpu(raw_super->segment_count_sit); 931 fsmeta += le32_to_cpu(raw_super->segment_count_nat); 932 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count); 933 fsmeta += le32_to_cpu(raw_super->segment_count_ssa); 934 935 if (unlikely(fsmeta >= total)) 936 return 1; 937 938 if (unlikely(f2fs_cp_error(sbi))) { 939 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck"); 940 return 1; 941 } 942 return 0; 943 } 944 945 static void init_sb_info(struct f2fs_sb_info *sbi) 946 { 947 struct f2fs_super_block *raw_super = sbi->raw_super; 948 int i; 949 950 sbi->log_sectors_per_block = 951 le32_to_cpu(raw_super->log_sectors_per_block); 952 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize); 953 sbi->blocksize = 1 << sbi->log_blocksize; 954 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); 955 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg; 956 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec); 957 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone); 958 sbi->total_sections = le32_to_cpu(raw_super->section_count); 959 sbi->total_node_count = 960 (le32_to_cpu(raw_super->segment_count_nat) / 2) 961 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK; 962 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino); 963 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino); 964 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino); 965 sbi->cur_victim_sec = NULL_SECNO; 966 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH; 967 968 for (i = 0; i < NR_COUNT_TYPE; i++) 969 atomic_set(&sbi->nr_pages[i], 0); 970 971 sbi->dir_level = DEF_DIR_LEVEL; 972 clear_sbi_flag(sbi, SBI_NEED_FSCK); 973 } 974 975 /* 976 * Read f2fs raw super block. 977 * Because we have two copies of super block, so read the first one at first, 978 * if the first one is invalid, move to read the second one. 979 */ 980 static int read_raw_super_block(struct super_block *sb, 981 struct f2fs_super_block **raw_super, 982 struct buffer_head **raw_super_buf, 983 int *recovery) 984 { 985 int block = 0; 986 struct buffer_head *buffer; 987 struct f2fs_super_block *super; 988 int err = 0; 989 990 retry: 991 buffer = sb_bread(sb, block); 992 if (!buffer) { 993 *recovery = 1; 994 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock", 995 block + 1); 996 if (block == 0) { 997 block++; 998 goto retry; 999 } else { 1000 err = -EIO; 1001 goto out; 1002 } 1003 } 1004 1005 super = (struct f2fs_super_block *) 1006 ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET); 1007 1008 /* sanity checking of raw super */ 1009 if (sanity_check_raw_super(sb, super)) { 1010 brelse(buffer); 1011 *recovery = 1; 1012 f2fs_msg(sb, KERN_ERR, 1013 "Can't find valid F2FS filesystem in %dth superblock", 1014 block + 1); 1015 if (block == 0) { 1016 block++; 1017 goto retry; 1018 } else { 1019 err = -EINVAL; 1020 goto out; 1021 } 1022 } 1023 1024 if (!*raw_super) { 1025 *raw_super_buf = buffer; 1026 *raw_super = super; 1027 } else { 1028 /* already have a valid superblock */ 1029 brelse(buffer); 1030 } 1031 1032 /* check the validity of the second superblock */ 1033 if (block == 0) { 1034 block++; 1035 goto retry; 1036 } 1037 1038 out: 1039 /* No valid superblock */ 1040 if (!*raw_super) 1041 return err; 1042 1043 return 0; 1044 } 1045 1046 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover) 1047 { 1048 struct buffer_head *sbh = sbi->raw_super_buf; 1049 sector_t block = sbh->b_blocknr; 1050 int err; 1051 1052 /* write back-up superblock first */ 1053 sbh->b_blocknr = block ? 0 : 1; 1054 mark_buffer_dirty(sbh); 1055 err = sync_dirty_buffer(sbh); 1056 1057 sbh->b_blocknr = block; 1058 1059 /* if we are in recovery path, skip writing valid superblock */ 1060 if (recover || err) 1061 goto out; 1062 1063 /* write current valid superblock */ 1064 mark_buffer_dirty(sbh); 1065 err = sync_dirty_buffer(sbh); 1066 out: 1067 clear_buffer_write_io_error(sbh); 1068 set_buffer_uptodate(sbh); 1069 return err; 1070 } 1071 1072 static int f2fs_fill_super(struct super_block *sb, void *data, int silent) 1073 { 1074 struct f2fs_sb_info *sbi; 1075 struct f2fs_super_block *raw_super; 1076 struct buffer_head *raw_super_buf; 1077 struct inode *root; 1078 long err; 1079 bool retry = true, need_fsck = false; 1080 char *options = NULL; 1081 int recovery, i; 1082 1083 try_onemore: 1084 err = -EINVAL; 1085 raw_super = NULL; 1086 raw_super_buf = NULL; 1087 recovery = 0; 1088 1089 /* allocate memory for f2fs-specific super block info */ 1090 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL); 1091 if (!sbi) 1092 return -ENOMEM; 1093 1094 /* set a block size */ 1095 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) { 1096 f2fs_msg(sb, KERN_ERR, "unable to set blocksize"); 1097 goto free_sbi; 1098 } 1099 1100 err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery); 1101 if (err) 1102 goto free_sbi; 1103 1104 sb->s_fs_info = sbi; 1105 default_options(sbi); 1106 /* parse mount options */ 1107 options = kstrdup((const char *)data, GFP_KERNEL); 1108 if (data && !options) { 1109 err = -ENOMEM; 1110 goto free_sb_buf; 1111 } 1112 1113 err = parse_options(sb, options); 1114 if (err) 1115 goto free_options; 1116 1117 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); 1118 sb->s_max_links = F2FS_LINK_MAX; 1119 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1120 1121 sb->s_op = &f2fs_sops; 1122 sb->s_xattr = f2fs_xattr_handlers; 1123 sb->s_export_op = &f2fs_export_ops; 1124 sb->s_magic = F2FS_SUPER_MAGIC; 1125 sb->s_time_gran = 1; 1126 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1127 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0); 1128 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid)); 1129 1130 /* init f2fs-specific super block info */ 1131 sbi->sb = sb; 1132 sbi->raw_super = raw_super; 1133 sbi->raw_super_buf = raw_super_buf; 1134 mutex_init(&sbi->gc_mutex); 1135 mutex_init(&sbi->writepages); 1136 mutex_init(&sbi->cp_mutex); 1137 init_rwsem(&sbi->node_write); 1138 clear_sbi_flag(sbi, SBI_POR_DOING); 1139 spin_lock_init(&sbi->stat_lock); 1140 1141 init_rwsem(&sbi->read_io.io_rwsem); 1142 sbi->read_io.sbi = sbi; 1143 sbi->read_io.bio = NULL; 1144 for (i = 0; i < NR_PAGE_TYPE; i++) { 1145 init_rwsem(&sbi->write_io[i].io_rwsem); 1146 sbi->write_io[i].sbi = sbi; 1147 sbi->write_io[i].bio = NULL; 1148 } 1149 1150 init_rwsem(&sbi->cp_rwsem); 1151 init_waitqueue_head(&sbi->cp_wait); 1152 init_sb_info(sbi); 1153 1154 /* get an inode for meta space */ 1155 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); 1156 if (IS_ERR(sbi->meta_inode)) { 1157 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode"); 1158 err = PTR_ERR(sbi->meta_inode); 1159 goto free_options; 1160 } 1161 1162 err = get_valid_checkpoint(sbi); 1163 if (err) { 1164 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint"); 1165 goto free_meta_inode; 1166 } 1167 1168 /* sanity checking of checkpoint */ 1169 err = -EINVAL; 1170 if (sanity_check_ckpt(sbi)) { 1171 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint"); 1172 goto free_cp; 1173 } 1174 1175 sbi->total_valid_node_count = 1176 le32_to_cpu(sbi->ckpt->valid_node_count); 1177 sbi->total_valid_inode_count = 1178 le32_to_cpu(sbi->ckpt->valid_inode_count); 1179 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count); 1180 sbi->total_valid_block_count = 1181 le64_to_cpu(sbi->ckpt->valid_block_count); 1182 sbi->last_valid_block_count = sbi->total_valid_block_count; 1183 sbi->alloc_valid_block_count = 0; 1184 INIT_LIST_HEAD(&sbi->dir_inode_list); 1185 spin_lock_init(&sbi->dir_inode_lock); 1186 1187 init_extent_cache_info(sbi); 1188 1189 init_ino_entry_info(sbi); 1190 1191 /* setup f2fs internal modules */ 1192 err = build_segment_manager(sbi); 1193 if (err) { 1194 f2fs_msg(sb, KERN_ERR, 1195 "Failed to initialize F2FS segment manager"); 1196 goto free_sm; 1197 } 1198 err = build_node_manager(sbi); 1199 if (err) { 1200 f2fs_msg(sb, KERN_ERR, 1201 "Failed to initialize F2FS node manager"); 1202 goto free_nm; 1203 } 1204 1205 build_gc_manager(sbi); 1206 1207 /* get an inode for node space */ 1208 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); 1209 if (IS_ERR(sbi->node_inode)) { 1210 f2fs_msg(sb, KERN_ERR, "Failed to read node inode"); 1211 err = PTR_ERR(sbi->node_inode); 1212 goto free_nm; 1213 } 1214 1215 /* if there are nt orphan nodes free them */ 1216 recover_orphan_inodes(sbi); 1217 1218 /* read root inode and dentry */ 1219 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi)); 1220 if (IS_ERR(root)) { 1221 f2fs_msg(sb, KERN_ERR, "Failed to read root inode"); 1222 err = PTR_ERR(root); 1223 goto free_node_inode; 1224 } 1225 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1226 iput(root); 1227 err = -EINVAL; 1228 goto free_node_inode; 1229 } 1230 1231 sb->s_root = d_make_root(root); /* allocate root dentry */ 1232 if (!sb->s_root) { 1233 err = -ENOMEM; 1234 goto free_root_inode; 1235 } 1236 1237 err = f2fs_build_stats(sbi); 1238 if (err) 1239 goto free_root_inode; 1240 1241 if (f2fs_proc_root) 1242 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root); 1243 1244 if (sbi->s_proc) 1245 proc_create_data("segment_info", S_IRUGO, sbi->s_proc, 1246 &f2fs_seq_segment_info_fops, sb); 1247 1248 sbi->s_kobj.kset = f2fs_kset; 1249 init_completion(&sbi->s_kobj_unregister); 1250 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL, 1251 "%s", sb->s_id); 1252 if (err) 1253 goto free_proc; 1254 1255 /* recover fsynced data */ 1256 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) { 1257 /* 1258 * mount should be failed, when device has readonly mode, and 1259 * previous checkpoint was not done by clean system shutdown. 1260 */ 1261 if (bdev_read_only(sb->s_bdev) && 1262 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) { 1263 err = -EROFS; 1264 goto free_kobj; 1265 } 1266 1267 if (need_fsck) 1268 set_sbi_flag(sbi, SBI_NEED_FSCK); 1269 1270 err = recover_fsync_data(sbi); 1271 if (err) { 1272 need_fsck = true; 1273 f2fs_msg(sb, KERN_ERR, 1274 "Cannot recover all fsync data errno=%ld", err); 1275 goto free_kobj; 1276 } 1277 } 1278 1279 /* 1280 * If filesystem is not mounted as read-only then 1281 * do start the gc_thread. 1282 */ 1283 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) { 1284 /* After POR, we can run background GC thread.*/ 1285 err = start_gc_thread(sbi); 1286 if (err) 1287 goto free_kobj; 1288 } 1289 kfree(options); 1290 1291 /* recover broken superblock */ 1292 if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) { 1293 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock"); 1294 f2fs_commit_super(sbi, true); 1295 } 1296 1297 return 0; 1298 1299 free_kobj: 1300 kobject_del(&sbi->s_kobj); 1301 free_proc: 1302 if (sbi->s_proc) { 1303 remove_proc_entry("segment_info", sbi->s_proc); 1304 remove_proc_entry(sb->s_id, f2fs_proc_root); 1305 } 1306 f2fs_destroy_stats(sbi); 1307 free_root_inode: 1308 dput(sb->s_root); 1309 sb->s_root = NULL; 1310 free_node_inode: 1311 iput(sbi->node_inode); 1312 free_nm: 1313 destroy_node_manager(sbi); 1314 free_sm: 1315 destroy_segment_manager(sbi); 1316 free_cp: 1317 kfree(sbi->ckpt); 1318 free_meta_inode: 1319 make_bad_inode(sbi->meta_inode); 1320 iput(sbi->meta_inode); 1321 free_options: 1322 kfree(options); 1323 free_sb_buf: 1324 brelse(raw_super_buf); 1325 free_sbi: 1326 kfree(sbi); 1327 1328 /* give only one another chance */ 1329 if (retry) { 1330 retry = false; 1331 shrink_dcache_sb(sb); 1332 goto try_onemore; 1333 } 1334 return err; 1335 } 1336 1337 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags, 1338 const char *dev_name, void *data) 1339 { 1340 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super); 1341 } 1342 1343 static void kill_f2fs_super(struct super_block *sb) 1344 { 1345 if (sb->s_root) 1346 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE); 1347 kill_block_super(sb); 1348 } 1349 1350 static struct file_system_type f2fs_fs_type = { 1351 .owner = THIS_MODULE, 1352 .name = "f2fs", 1353 .mount = f2fs_mount, 1354 .kill_sb = kill_f2fs_super, 1355 .fs_flags = FS_REQUIRES_DEV, 1356 }; 1357 MODULE_ALIAS_FS("f2fs"); 1358 1359 static int __init init_inodecache(void) 1360 { 1361 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache", 1362 sizeof(struct f2fs_inode_info)); 1363 if (!f2fs_inode_cachep) 1364 return -ENOMEM; 1365 return 0; 1366 } 1367 1368 static void destroy_inodecache(void) 1369 { 1370 /* 1371 * Make sure all delayed rcu free inodes are flushed before we 1372 * destroy cache. 1373 */ 1374 rcu_barrier(); 1375 kmem_cache_destroy(f2fs_inode_cachep); 1376 } 1377 1378 static int __init init_f2fs_fs(void) 1379 { 1380 int err; 1381 1382 f2fs_build_trace_ios(); 1383 1384 err = init_inodecache(); 1385 if (err) 1386 goto fail; 1387 err = create_node_manager_caches(); 1388 if (err) 1389 goto free_inodecache; 1390 err = create_segment_manager_caches(); 1391 if (err) 1392 goto free_node_manager_caches; 1393 err = create_checkpoint_caches(); 1394 if (err) 1395 goto free_segment_manager_caches; 1396 err = create_extent_cache(); 1397 if (err) 1398 goto free_checkpoint_caches; 1399 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj); 1400 if (!f2fs_kset) { 1401 err = -ENOMEM; 1402 goto free_extent_cache; 1403 } 1404 err = f2fs_init_crypto(); 1405 if (err) 1406 goto free_kset; 1407 err = register_filesystem(&f2fs_fs_type); 1408 if (err) 1409 goto free_crypto; 1410 f2fs_create_root_stats(); 1411 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); 1412 return 0; 1413 1414 free_crypto: 1415 f2fs_exit_crypto(); 1416 free_kset: 1417 kset_unregister(f2fs_kset); 1418 free_extent_cache: 1419 destroy_extent_cache(); 1420 free_checkpoint_caches: 1421 destroy_checkpoint_caches(); 1422 free_segment_manager_caches: 1423 destroy_segment_manager_caches(); 1424 free_node_manager_caches: 1425 destroy_node_manager_caches(); 1426 free_inodecache: 1427 destroy_inodecache(); 1428 fail: 1429 return err; 1430 } 1431 1432 static void __exit exit_f2fs_fs(void) 1433 { 1434 remove_proc_entry("fs/f2fs", NULL); 1435 f2fs_destroy_root_stats(); 1436 unregister_filesystem(&f2fs_fs_type); 1437 f2fs_exit_crypto(); 1438 destroy_extent_cache(); 1439 destroy_checkpoint_caches(); 1440 destroy_segment_manager_caches(); 1441 destroy_node_manager_caches(); 1442 destroy_inodecache(); 1443 kset_unregister(f2fs_kset); 1444 f2fs_destroy_trace_ios(); 1445 } 1446 1447 module_init(init_f2fs_fs) 1448 module_exit(exit_f2fs_fs) 1449 1450 MODULE_AUTHOR("Samsung Electronics's Praesto Team"); 1451 MODULE_DESCRIPTION("Flash Friendly File System"); 1452 MODULE_LICENSE("GPL"); 1453