1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/f2fs/gc.c 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 */ 8 #include <linux/fs.h> 9 #include <linux/module.h> 10 #include <linux/backing-dev.h> 11 #include <linux/init.h> 12 #include <linux/f2fs_fs.h> 13 #include <linux/kthread.h> 14 #include <linux/delay.h> 15 #include <linux/freezer.h> 16 #include <linux/sched/signal.h> 17 18 #include "f2fs.h" 19 #include "node.h" 20 #include "segment.h" 21 #include "gc.h" 22 #include <trace/events/f2fs.h> 23 24 static unsigned int count_bits(const unsigned long *addr, 25 unsigned int offset, unsigned int len); 26 27 static int gc_thread_func(void *data) 28 { 29 struct f2fs_sb_info *sbi = data; 30 struct f2fs_gc_kthread *gc_th = sbi->gc_thread; 31 wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head; 32 unsigned int wait_ms; 33 34 wait_ms = gc_th->min_sleep_time; 35 36 set_freezable(); 37 do { 38 bool sync_mode; 39 40 wait_event_interruptible_timeout(*wq, 41 kthread_should_stop() || freezing(current) || 42 gc_th->gc_wake, 43 msecs_to_jiffies(wait_ms)); 44 45 /* give it a try one time */ 46 if (gc_th->gc_wake) 47 gc_th->gc_wake = 0; 48 49 if (try_to_freeze()) { 50 stat_other_skip_bggc_count(sbi); 51 continue; 52 } 53 if (kthread_should_stop()) 54 break; 55 56 if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) { 57 increase_sleep_time(gc_th, &wait_ms); 58 stat_other_skip_bggc_count(sbi); 59 continue; 60 } 61 62 if (time_to_inject(sbi, FAULT_CHECKPOINT)) { 63 f2fs_show_injection_info(sbi, FAULT_CHECKPOINT); 64 f2fs_stop_checkpoint(sbi, false); 65 } 66 67 if (!sb_start_write_trylock(sbi->sb)) { 68 stat_other_skip_bggc_count(sbi); 69 continue; 70 } 71 72 /* 73 * [GC triggering condition] 74 * 0. GC is not conducted currently. 75 * 1. There are enough dirty segments. 76 * 2. IO subsystem is idle by checking the # of writeback pages. 77 * 3. IO subsystem is idle by checking the # of requests in 78 * bdev's request list. 79 * 80 * Note) We have to avoid triggering GCs frequently. 81 * Because it is possible that some segments can be 82 * invalidated soon after by user update or deletion. 83 * So, I'd like to wait some time to collect dirty segments. 84 */ 85 if (sbi->gc_mode == GC_URGENT_HIGH) { 86 wait_ms = gc_th->urgent_sleep_time; 87 down_write(&sbi->gc_lock); 88 goto do_gc; 89 } 90 91 if (!down_write_trylock(&sbi->gc_lock)) { 92 stat_other_skip_bggc_count(sbi); 93 goto next; 94 } 95 96 if (!is_idle(sbi, GC_TIME)) { 97 increase_sleep_time(gc_th, &wait_ms); 98 up_write(&sbi->gc_lock); 99 stat_io_skip_bggc_count(sbi); 100 goto next; 101 } 102 103 if (has_enough_invalid_blocks(sbi)) 104 decrease_sleep_time(gc_th, &wait_ms); 105 else 106 increase_sleep_time(gc_th, &wait_ms); 107 do_gc: 108 stat_inc_bggc_count(sbi->stat_info); 109 110 sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC; 111 112 /* if return value is not zero, no victim was selected */ 113 if (f2fs_gc(sbi, sync_mode, true, NULL_SEGNO)) 114 wait_ms = gc_th->no_gc_sleep_time; 115 116 trace_f2fs_background_gc(sbi->sb, wait_ms, 117 prefree_segments(sbi), free_segments(sbi)); 118 119 /* balancing f2fs's metadata periodically */ 120 f2fs_balance_fs_bg(sbi, true); 121 next: 122 sb_end_write(sbi->sb); 123 124 } while (!kthread_should_stop()); 125 return 0; 126 } 127 128 int f2fs_start_gc_thread(struct f2fs_sb_info *sbi) 129 { 130 struct f2fs_gc_kthread *gc_th; 131 dev_t dev = sbi->sb->s_bdev->bd_dev; 132 int err = 0; 133 134 gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL); 135 if (!gc_th) { 136 err = -ENOMEM; 137 goto out; 138 } 139 140 gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME; 141 gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME; 142 gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME; 143 gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME; 144 145 gc_th->gc_wake= 0; 146 147 sbi->gc_thread = gc_th; 148 init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head); 149 sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi, 150 "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev)); 151 if (IS_ERR(gc_th->f2fs_gc_task)) { 152 err = PTR_ERR(gc_th->f2fs_gc_task); 153 kvfree(gc_th); 154 sbi->gc_thread = NULL; 155 } 156 out: 157 return err; 158 } 159 160 void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi) 161 { 162 struct f2fs_gc_kthread *gc_th = sbi->gc_thread; 163 if (!gc_th) 164 return; 165 kthread_stop(gc_th->f2fs_gc_task); 166 kvfree(gc_th); 167 sbi->gc_thread = NULL; 168 } 169 170 static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type) 171 { 172 int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY; 173 174 switch (sbi->gc_mode) { 175 case GC_IDLE_CB: 176 gc_mode = GC_CB; 177 break; 178 case GC_IDLE_GREEDY: 179 case GC_URGENT_HIGH: 180 gc_mode = GC_GREEDY; 181 break; 182 } 183 return gc_mode; 184 } 185 186 static void select_policy(struct f2fs_sb_info *sbi, int gc_type, 187 int type, struct victim_sel_policy *p) 188 { 189 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); 190 191 if (p->alloc_mode == SSR) { 192 p->gc_mode = GC_GREEDY; 193 p->dirty_bitmap = dirty_i->dirty_segmap[type]; 194 p->max_search = dirty_i->nr_dirty[type]; 195 p->ofs_unit = 1; 196 } else { 197 p->gc_mode = select_gc_type(sbi, gc_type); 198 p->ofs_unit = sbi->segs_per_sec; 199 if (__is_large_section(sbi)) { 200 p->dirty_bitmap = dirty_i->dirty_secmap; 201 p->max_search = count_bits(p->dirty_bitmap, 202 0, MAIN_SECS(sbi)); 203 } else { 204 p->dirty_bitmap = dirty_i->dirty_segmap[DIRTY]; 205 p->max_search = dirty_i->nr_dirty[DIRTY]; 206 } 207 } 208 209 /* 210 * adjust candidates range, should select all dirty segments for 211 * foreground GC and urgent GC cases. 212 */ 213 if (gc_type != FG_GC && 214 (sbi->gc_mode != GC_URGENT_HIGH) && 215 p->max_search > sbi->max_victim_search) 216 p->max_search = sbi->max_victim_search; 217 218 /* let's select beginning hot/small space first in no_heap mode*/ 219 if (test_opt(sbi, NOHEAP) && 220 (type == CURSEG_HOT_DATA || IS_NODESEG(type))) 221 p->offset = 0; 222 else 223 p->offset = SIT_I(sbi)->last_victim[p->gc_mode]; 224 } 225 226 static unsigned int get_max_cost(struct f2fs_sb_info *sbi, 227 struct victim_sel_policy *p) 228 { 229 /* SSR allocates in a segment unit */ 230 if (p->alloc_mode == SSR) 231 return sbi->blocks_per_seg; 232 if (p->gc_mode == GC_GREEDY) 233 return 2 * sbi->blocks_per_seg * p->ofs_unit; 234 else if (p->gc_mode == GC_CB) 235 return UINT_MAX; 236 else /* No other gc_mode */ 237 return 0; 238 } 239 240 static unsigned int check_bg_victims(struct f2fs_sb_info *sbi) 241 { 242 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); 243 unsigned int secno; 244 245 /* 246 * If the gc_type is FG_GC, we can select victim segments 247 * selected by background GC before. 248 * Those segments guarantee they have small valid blocks. 249 */ 250 for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) { 251 if (sec_usage_check(sbi, secno)) 252 continue; 253 clear_bit(secno, dirty_i->victim_secmap); 254 return GET_SEG_FROM_SEC(sbi, secno); 255 } 256 return NULL_SEGNO; 257 } 258 259 static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno) 260 { 261 struct sit_info *sit_i = SIT_I(sbi); 262 unsigned int secno = GET_SEC_FROM_SEG(sbi, segno); 263 unsigned int start = GET_SEG_FROM_SEC(sbi, secno); 264 unsigned long long mtime = 0; 265 unsigned int vblocks; 266 unsigned char age = 0; 267 unsigned char u; 268 unsigned int i; 269 270 for (i = 0; i < sbi->segs_per_sec; i++) 271 mtime += get_seg_entry(sbi, start + i)->mtime; 272 vblocks = get_valid_blocks(sbi, segno, true); 273 274 mtime = div_u64(mtime, sbi->segs_per_sec); 275 vblocks = div_u64(vblocks, sbi->segs_per_sec); 276 277 u = (vblocks * 100) >> sbi->log_blocks_per_seg; 278 279 /* Handle if the system time has changed by the user */ 280 if (mtime < sit_i->min_mtime) 281 sit_i->min_mtime = mtime; 282 if (mtime > sit_i->max_mtime) 283 sit_i->max_mtime = mtime; 284 if (sit_i->max_mtime != sit_i->min_mtime) 285 age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime), 286 sit_i->max_mtime - sit_i->min_mtime); 287 288 return UINT_MAX - ((100 * (100 - u) * age) / (100 + u)); 289 } 290 291 static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi, 292 unsigned int segno, struct victim_sel_policy *p) 293 { 294 if (p->alloc_mode == SSR) 295 return get_seg_entry(sbi, segno)->ckpt_valid_blocks; 296 297 /* alloc_mode == LFS */ 298 if (p->gc_mode == GC_GREEDY) 299 return get_valid_blocks(sbi, segno, true); 300 else 301 return get_cb_cost(sbi, segno); 302 } 303 304 static unsigned int count_bits(const unsigned long *addr, 305 unsigned int offset, unsigned int len) 306 { 307 unsigned int end = offset + len, sum = 0; 308 309 while (offset < end) { 310 if (test_bit(offset++, addr)) 311 ++sum; 312 } 313 return sum; 314 } 315 316 /* 317 * This function is called from two paths. 318 * One is garbage collection and the other is SSR segment selection. 319 * When it is called during GC, it just gets a victim segment 320 * and it does not remove it from dirty seglist. 321 * When it is called from SSR segment selection, it finds a segment 322 * which has minimum valid blocks and removes it from dirty seglist. 323 */ 324 static int get_victim_by_default(struct f2fs_sb_info *sbi, 325 unsigned int *result, int gc_type, int type, char alloc_mode) 326 { 327 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi); 328 struct sit_info *sm = SIT_I(sbi); 329 struct victim_sel_policy p; 330 unsigned int secno, last_victim; 331 unsigned int last_segment; 332 unsigned int nsearched = 0; 333 int ret = 0; 334 335 mutex_lock(&dirty_i->seglist_lock); 336 last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec; 337 338 p.alloc_mode = alloc_mode; 339 select_policy(sbi, gc_type, type, &p); 340 341 p.min_segno = NULL_SEGNO; 342 p.min_cost = get_max_cost(sbi, &p); 343 344 if (*result != NULL_SEGNO) { 345 if (!get_valid_blocks(sbi, *result, false)) { 346 ret = -ENODATA; 347 goto out; 348 } 349 350 if (sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result))) 351 ret = -EBUSY; 352 else 353 p.min_segno = *result; 354 goto out; 355 } 356 357 ret = -ENODATA; 358 if (p.max_search == 0) 359 goto out; 360 361 if (__is_large_section(sbi) && p.alloc_mode == LFS) { 362 if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) { 363 p.min_segno = sbi->next_victim_seg[BG_GC]; 364 *result = p.min_segno; 365 sbi->next_victim_seg[BG_GC] = NULL_SEGNO; 366 goto got_result; 367 } 368 if (gc_type == FG_GC && 369 sbi->next_victim_seg[FG_GC] != NULL_SEGNO) { 370 p.min_segno = sbi->next_victim_seg[FG_GC]; 371 *result = p.min_segno; 372 sbi->next_victim_seg[FG_GC] = NULL_SEGNO; 373 goto got_result; 374 } 375 } 376 377 last_victim = sm->last_victim[p.gc_mode]; 378 if (p.alloc_mode == LFS && gc_type == FG_GC) { 379 p.min_segno = check_bg_victims(sbi); 380 if (p.min_segno != NULL_SEGNO) 381 goto got_it; 382 } 383 384 while (1) { 385 unsigned long cost, *dirty_bitmap; 386 unsigned int unit_no, segno; 387 388 dirty_bitmap = p.dirty_bitmap; 389 unit_no = find_next_bit(dirty_bitmap, 390 last_segment / p.ofs_unit, 391 p.offset / p.ofs_unit); 392 segno = unit_no * p.ofs_unit; 393 if (segno >= last_segment) { 394 if (sm->last_victim[p.gc_mode]) { 395 last_segment = 396 sm->last_victim[p.gc_mode]; 397 sm->last_victim[p.gc_mode] = 0; 398 p.offset = 0; 399 continue; 400 } 401 break; 402 } 403 404 p.offset = segno + p.ofs_unit; 405 nsearched++; 406 407 #ifdef CONFIG_F2FS_CHECK_FS 408 /* 409 * skip selecting the invalid segno (that is failed due to block 410 * validity check failure during GC) to avoid endless GC loop in 411 * such cases. 412 */ 413 if (test_bit(segno, sm->invalid_segmap)) 414 goto next; 415 #endif 416 417 secno = GET_SEC_FROM_SEG(sbi, segno); 418 419 if (sec_usage_check(sbi, secno)) 420 goto next; 421 /* Don't touch checkpointed data */ 422 if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) && 423 get_ckpt_valid_blocks(sbi, segno) && 424 p.alloc_mode != SSR)) 425 goto next; 426 if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap)) 427 goto next; 428 429 cost = get_gc_cost(sbi, segno, &p); 430 431 if (p.min_cost > cost) { 432 p.min_segno = segno; 433 p.min_cost = cost; 434 } 435 next: 436 if (nsearched >= p.max_search) { 437 if (!sm->last_victim[p.gc_mode] && segno <= last_victim) 438 sm->last_victim[p.gc_mode] = 439 last_victim + p.ofs_unit; 440 else 441 sm->last_victim[p.gc_mode] = segno + p.ofs_unit; 442 sm->last_victim[p.gc_mode] %= 443 (MAIN_SECS(sbi) * sbi->segs_per_sec); 444 break; 445 } 446 } 447 if (p.min_segno != NULL_SEGNO) { 448 got_it: 449 *result = (p.min_segno / p.ofs_unit) * p.ofs_unit; 450 got_result: 451 if (p.alloc_mode == LFS) { 452 secno = GET_SEC_FROM_SEG(sbi, p.min_segno); 453 if (gc_type == FG_GC) 454 sbi->cur_victim_sec = secno; 455 else 456 set_bit(secno, dirty_i->victim_secmap); 457 } 458 ret = 0; 459 460 } 461 out: 462 if (p.min_segno != NULL_SEGNO) 463 trace_f2fs_get_victim(sbi->sb, type, gc_type, &p, 464 sbi->cur_victim_sec, 465 prefree_segments(sbi), free_segments(sbi)); 466 mutex_unlock(&dirty_i->seglist_lock); 467 468 return ret; 469 } 470 471 static const struct victim_selection default_v_ops = { 472 .get_victim = get_victim_by_default, 473 }; 474 475 static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino) 476 { 477 struct inode_entry *ie; 478 479 ie = radix_tree_lookup(&gc_list->iroot, ino); 480 if (ie) 481 return ie->inode; 482 return NULL; 483 } 484 485 static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode) 486 { 487 struct inode_entry *new_ie; 488 489 if (inode == find_gc_inode(gc_list, inode->i_ino)) { 490 iput(inode); 491 return; 492 } 493 new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab, GFP_NOFS); 494 new_ie->inode = inode; 495 496 f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie); 497 list_add_tail(&new_ie->list, &gc_list->ilist); 498 } 499 500 static void put_gc_inode(struct gc_inode_list *gc_list) 501 { 502 struct inode_entry *ie, *next_ie; 503 list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) { 504 radix_tree_delete(&gc_list->iroot, ie->inode->i_ino); 505 iput(ie->inode); 506 list_del(&ie->list); 507 kmem_cache_free(f2fs_inode_entry_slab, ie); 508 } 509 } 510 511 static int check_valid_map(struct f2fs_sb_info *sbi, 512 unsigned int segno, int offset) 513 { 514 struct sit_info *sit_i = SIT_I(sbi); 515 struct seg_entry *sentry; 516 int ret; 517 518 down_read(&sit_i->sentry_lock); 519 sentry = get_seg_entry(sbi, segno); 520 ret = f2fs_test_bit(offset, sentry->cur_valid_map); 521 up_read(&sit_i->sentry_lock); 522 return ret; 523 } 524 525 /* 526 * This function compares node address got in summary with that in NAT. 527 * On validity, copy that node with cold status, otherwise (invalid node) 528 * ignore that. 529 */ 530 static int gc_node_segment(struct f2fs_sb_info *sbi, 531 struct f2fs_summary *sum, unsigned int segno, int gc_type) 532 { 533 struct f2fs_summary *entry; 534 block_t start_addr; 535 int off; 536 int phase = 0; 537 bool fggc = (gc_type == FG_GC); 538 int submitted = 0; 539 540 start_addr = START_BLOCK(sbi, segno); 541 542 next_step: 543 entry = sum; 544 545 if (fggc && phase == 2) 546 atomic_inc(&sbi->wb_sync_req[NODE]); 547 548 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) { 549 nid_t nid = le32_to_cpu(entry->nid); 550 struct page *node_page; 551 struct node_info ni; 552 int err; 553 554 /* stop BG_GC if there is not enough free sections. */ 555 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) 556 return submitted; 557 558 if (check_valid_map(sbi, segno, off) == 0) 559 continue; 560 561 if (phase == 0) { 562 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1, 563 META_NAT, true); 564 continue; 565 } 566 567 if (phase == 1) { 568 f2fs_ra_node_page(sbi, nid); 569 continue; 570 } 571 572 /* phase == 2 */ 573 node_page = f2fs_get_node_page(sbi, nid); 574 if (IS_ERR(node_page)) 575 continue; 576 577 /* block may become invalid during f2fs_get_node_page */ 578 if (check_valid_map(sbi, segno, off) == 0) { 579 f2fs_put_page(node_page, 1); 580 continue; 581 } 582 583 if (f2fs_get_node_info(sbi, nid, &ni)) { 584 f2fs_put_page(node_page, 1); 585 continue; 586 } 587 588 if (ni.blk_addr != start_addr + off) { 589 f2fs_put_page(node_page, 1); 590 continue; 591 } 592 593 err = f2fs_move_node_page(node_page, gc_type); 594 if (!err && gc_type == FG_GC) 595 submitted++; 596 stat_inc_node_blk_count(sbi, 1, gc_type); 597 } 598 599 if (++phase < 3) 600 goto next_step; 601 602 if (fggc) 603 atomic_dec(&sbi->wb_sync_req[NODE]); 604 return submitted; 605 } 606 607 /* 608 * Calculate start block index indicating the given node offset. 609 * Be careful, caller should give this node offset only indicating direct node 610 * blocks. If any node offsets, which point the other types of node blocks such 611 * as indirect or double indirect node blocks, are given, it must be a caller's 612 * bug. 613 */ 614 block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode) 615 { 616 unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4; 617 unsigned int bidx; 618 619 if (node_ofs == 0) 620 return 0; 621 622 if (node_ofs <= 2) { 623 bidx = node_ofs - 1; 624 } else if (node_ofs <= indirect_blks) { 625 int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1); 626 bidx = node_ofs - 2 - dec; 627 } else { 628 int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1); 629 bidx = node_ofs - 5 - dec; 630 } 631 return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode); 632 } 633 634 static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 635 struct node_info *dni, block_t blkaddr, unsigned int *nofs) 636 { 637 struct page *node_page; 638 nid_t nid; 639 unsigned int ofs_in_node; 640 block_t source_blkaddr; 641 642 nid = le32_to_cpu(sum->nid); 643 ofs_in_node = le16_to_cpu(sum->ofs_in_node); 644 645 node_page = f2fs_get_node_page(sbi, nid); 646 if (IS_ERR(node_page)) 647 return false; 648 649 if (f2fs_get_node_info(sbi, nid, dni)) { 650 f2fs_put_page(node_page, 1); 651 return false; 652 } 653 654 if (sum->version != dni->version) { 655 f2fs_warn(sbi, "%s: valid data with mismatched node version.", 656 __func__); 657 set_sbi_flag(sbi, SBI_NEED_FSCK); 658 } 659 660 *nofs = ofs_of_node(node_page); 661 source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node); 662 f2fs_put_page(node_page, 1); 663 664 if (source_blkaddr != blkaddr) { 665 #ifdef CONFIG_F2FS_CHECK_FS 666 unsigned int segno = GET_SEGNO(sbi, blkaddr); 667 unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); 668 669 if (unlikely(check_valid_map(sbi, segno, offset))) { 670 if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) { 671 f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u\n", 672 blkaddr, source_blkaddr, segno); 673 f2fs_bug_on(sbi, 1); 674 } 675 } 676 #endif 677 return false; 678 } 679 return true; 680 } 681 682 static int ra_data_block(struct inode *inode, pgoff_t index) 683 { 684 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 685 struct address_space *mapping = inode->i_mapping; 686 struct dnode_of_data dn; 687 struct page *page; 688 struct extent_info ei = {0, 0, 0}; 689 struct f2fs_io_info fio = { 690 .sbi = sbi, 691 .ino = inode->i_ino, 692 .type = DATA, 693 .temp = COLD, 694 .op = REQ_OP_READ, 695 .op_flags = 0, 696 .encrypted_page = NULL, 697 .in_list = false, 698 .retry = false, 699 }; 700 int err; 701 702 page = f2fs_grab_cache_page(mapping, index, true); 703 if (!page) 704 return -ENOMEM; 705 706 if (f2fs_lookup_extent_cache(inode, index, &ei)) { 707 dn.data_blkaddr = ei.blk + index - ei.fofs; 708 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr, 709 DATA_GENERIC_ENHANCE_READ))) { 710 err = -EFSCORRUPTED; 711 goto put_page; 712 } 713 goto got_it; 714 } 715 716 set_new_dnode(&dn, inode, NULL, NULL, 0); 717 err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); 718 if (err) 719 goto put_page; 720 f2fs_put_dnode(&dn); 721 722 if (!__is_valid_data_blkaddr(dn.data_blkaddr)) { 723 err = -ENOENT; 724 goto put_page; 725 } 726 if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr, 727 DATA_GENERIC_ENHANCE))) { 728 err = -EFSCORRUPTED; 729 goto put_page; 730 } 731 got_it: 732 /* read page */ 733 fio.page = page; 734 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; 735 736 /* 737 * don't cache encrypted data into meta inode until previous dirty 738 * data were writebacked to avoid racing between GC and flush. 739 */ 740 f2fs_wait_on_page_writeback(page, DATA, true, true); 741 742 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr); 743 744 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi), 745 dn.data_blkaddr, 746 FGP_LOCK | FGP_CREAT, GFP_NOFS); 747 if (!fio.encrypted_page) { 748 err = -ENOMEM; 749 goto put_page; 750 } 751 752 err = f2fs_submit_page_bio(&fio); 753 if (err) 754 goto put_encrypted_page; 755 f2fs_put_page(fio.encrypted_page, 0); 756 f2fs_put_page(page, 1); 757 758 f2fs_update_iostat(sbi, FS_DATA_READ_IO, F2FS_BLKSIZE); 759 f2fs_update_iostat(sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE); 760 761 return 0; 762 put_encrypted_page: 763 f2fs_put_page(fio.encrypted_page, 1); 764 put_page: 765 f2fs_put_page(page, 1); 766 return err; 767 } 768 769 /* 770 * Move data block via META_MAPPING while keeping locked data page. 771 * This can be used to move blocks, aka LBAs, directly on disk. 772 */ 773 static int move_data_block(struct inode *inode, block_t bidx, 774 int gc_type, unsigned int segno, int off) 775 { 776 struct f2fs_io_info fio = { 777 .sbi = F2FS_I_SB(inode), 778 .ino = inode->i_ino, 779 .type = DATA, 780 .temp = COLD, 781 .op = REQ_OP_READ, 782 .op_flags = 0, 783 .encrypted_page = NULL, 784 .in_list = false, 785 .retry = false, 786 }; 787 struct dnode_of_data dn; 788 struct f2fs_summary sum; 789 struct node_info ni; 790 struct page *page, *mpage; 791 block_t newaddr; 792 int err = 0; 793 bool lfs_mode = f2fs_lfs_mode(fio.sbi); 794 795 /* do not read out */ 796 page = f2fs_grab_cache_page(inode->i_mapping, bidx, false); 797 if (!page) 798 return -ENOMEM; 799 800 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) { 801 err = -ENOENT; 802 goto out; 803 } 804 805 if (f2fs_is_atomic_file(inode)) { 806 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++; 807 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++; 808 err = -EAGAIN; 809 goto out; 810 } 811 812 if (f2fs_is_pinned_file(inode)) { 813 f2fs_pin_file_control(inode, true); 814 err = -EAGAIN; 815 goto out; 816 } 817 818 set_new_dnode(&dn, inode, NULL, NULL, 0); 819 err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE); 820 if (err) 821 goto out; 822 823 if (unlikely(dn.data_blkaddr == NULL_ADDR)) { 824 ClearPageUptodate(page); 825 err = -ENOENT; 826 goto put_out; 827 } 828 829 /* 830 * don't cache encrypted data into meta inode until previous dirty 831 * data were writebacked to avoid racing between GC and flush. 832 */ 833 f2fs_wait_on_page_writeback(page, DATA, true, true); 834 835 f2fs_wait_on_block_writeback(inode, dn.data_blkaddr); 836 837 err = f2fs_get_node_info(fio.sbi, dn.nid, &ni); 838 if (err) 839 goto put_out; 840 841 set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version); 842 843 /* read page */ 844 fio.page = page; 845 fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; 846 847 if (lfs_mode) 848 down_write(&fio.sbi->io_order_lock); 849 850 mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi), 851 fio.old_blkaddr, false); 852 if (!mpage) { 853 err = -ENOMEM; 854 goto up_out; 855 } 856 857 fio.encrypted_page = mpage; 858 859 /* read source block in mpage */ 860 if (!PageUptodate(mpage)) { 861 err = f2fs_submit_page_bio(&fio); 862 if (err) { 863 f2fs_put_page(mpage, 1); 864 goto up_out; 865 } 866 867 f2fs_update_iostat(fio.sbi, FS_DATA_READ_IO, F2FS_BLKSIZE); 868 f2fs_update_iostat(fio.sbi, FS_GDATA_READ_IO, F2FS_BLKSIZE); 869 870 lock_page(mpage); 871 if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) || 872 !PageUptodate(mpage))) { 873 err = -EIO; 874 f2fs_put_page(mpage, 1); 875 goto up_out; 876 } 877 } 878 879 f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr, 880 &sum, CURSEG_COLD_DATA, NULL); 881 882 fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi), 883 newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS); 884 if (!fio.encrypted_page) { 885 err = -ENOMEM; 886 f2fs_put_page(mpage, 1); 887 goto recover_block; 888 } 889 890 /* write target block */ 891 f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true); 892 memcpy(page_address(fio.encrypted_page), 893 page_address(mpage), PAGE_SIZE); 894 f2fs_put_page(mpage, 1); 895 invalidate_mapping_pages(META_MAPPING(fio.sbi), 896 fio.old_blkaddr, fio.old_blkaddr); 897 898 set_page_dirty(fio.encrypted_page); 899 if (clear_page_dirty_for_io(fio.encrypted_page)) 900 dec_page_count(fio.sbi, F2FS_DIRTY_META); 901 902 set_page_writeback(fio.encrypted_page); 903 ClearPageError(page); 904 905 /* allocate block address */ 906 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true); 907 908 fio.op = REQ_OP_WRITE; 909 fio.op_flags = REQ_SYNC; 910 fio.new_blkaddr = newaddr; 911 f2fs_submit_page_write(&fio); 912 if (fio.retry) { 913 err = -EAGAIN; 914 if (PageWriteback(fio.encrypted_page)) 915 end_page_writeback(fio.encrypted_page); 916 goto put_page_out; 917 } 918 919 f2fs_update_iostat(fio.sbi, FS_GC_DATA_IO, F2FS_BLKSIZE); 920 921 f2fs_update_data_blkaddr(&dn, newaddr); 922 set_inode_flag(inode, FI_APPEND_WRITE); 923 if (page->index == 0) 924 set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN); 925 put_page_out: 926 f2fs_put_page(fio.encrypted_page, 1); 927 recover_block: 928 if (err) 929 f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr, 930 true, true); 931 up_out: 932 if (lfs_mode) 933 up_write(&fio.sbi->io_order_lock); 934 put_out: 935 f2fs_put_dnode(&dn); 936 out: 937 f2fs_put_page(page, 1); 938 return err; 939 } 940 941 static int move_data_page(struct inode *inode, block_t bidx, int gc_type, 942 unsigned int segno, int off) 943 { 944 struct page *page; 945 int err = 0; 946 947 page = f2fs_get_lock_data_page(inode, bidx, true); 948 if (IS_ERR(page)) 949 return PTR_ERR(page); 950 951 if (!check_valid_map(F2FS_I_SB(inode), segno, off)) { 952 err = -ENOENT; 953 goto out; 954 } 955 956 if (f2fs_is_atomic_file(inode)) { 957 F2FS_I(inode)->i_gc_failures[GC_FAILURE_ATOMIC]++; 958 F2FS_I_SB(inode)->skipped_atomic_files[gc_type]++; 959 err = -EAGAIN; 960 goto out; 961 } 962 if (f2fs_is_pinned_file(inode)) { 963 if (gc_type == FG_GC) 964 f2fs_pin_file_control(inode, true); 965 err = -EAGAIN; 966 goto out; 967 } 968 969 if (gc_type == BG_GC) { 970 if (PageWriteback(page)) { 971 err = -EAGAIN; 972 goto out; 973 } 974 set_page_dirty(page); 975 set_cold_data(page); 976 } else { 977 struct f2fs_io_info fio = { 978 .sbi = F2FS_I_SB(inode), 979 .ino = inode->i_ino, 980 .type = DATA, 981 .temp = COLD, 982 .op = REQ_OP_WRITE, 983 .op_flags = REQ_SYNC, 984 .old_blkaddr = NULL_ADDR, 985 .page = page, 986 .encrypted_page = NULL, 987 .need_lock = LOCK_REQ, 988 .io_type = FS_GC_DATA_IO, 989 }; 990 bool is_dirty = PageDirty(page); 991 992 retry: 993 f2fs_wait_on_page_writeback(page, DATA, true, true); 994 995 set_page_dirty(page); 996 if (clear_page_dirty_for_io(page)) { 997 inode_dec_dirty_pages(inode); 998 f2fs_remove_dirty_inode(inode); 999 } 1000 1001 set_cold_data(page); 1002 1003 err = f2fs_do_write_data_page(&fio); 1004 if (err) { 1005 clear_cold_data(page); 1006 if (err == -ENOMEM) { 1007 congestion_wait(BLK_RW_ASYNC, 1008 DEFAULT_IO_TIMEOUT); 1009 goto retry; 1010 } 1011 if (is_dirty) 1012 set_page_dirty(page); 1013 } 1014 } 1015 out: 1016 f2fs_put_page(page, 1); 1017 return err; 1018 } 1019 1020 /* 1021 * This function tries to get parent node of victim data block, and identifies 1022 * data block validity. If the block is valid, copy that with cold status and 1023 * modify parent node. 1024 * If the parent node is not valid or the data block address is different, 1025 * the victim data block is ignored. 1026 */ 1027 static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 1028 struct gc_inode_list *gc_list, unsigned int segno, int gc_type) 1029 { 1030 struct super_block *sb = sbi->sb; 1031 struct f2fs_summary *entry; 1032 block_t start_addr; 1033 int off; 1034 int phase = 0; 1035 int submitted = 0; 1036 1037 start_addr = START_BLOCK(sbi, segno); 1038 1039 next_step: 1040 entry = sum; 1041 1042 for (off = 0; off < sbi->blocks_per_seg; off++, entry++) { 1043 struct page *data_page; 1044 struct inode *inode; 1045 struct node_info dni; /* dnode info for the data */ 1046 unsigned int ofs_in_node, nofs; 1047 block_t start_bidx; 1048 nid_t nid = le32_to_cpu(entry->nid); 1049 1050 /* 1051 * stop BG_GC if there is not enough free sections. 1052 * Or, stop GC if the segment becomes fully valid caused by 1053 * race condition along with SSR block allocation. 1054 */ 1055 if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) || 1056 get_valid_blocks(sbi, segno, true) == 1057 BLKS_PER_SEC(sbi)) 1058 return submitted; 1059 1060 if (check_valid_map(sbi, segno, off) == 0) 1061 continue; 1062 1063 if (phase == 0) { 1064 f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1, 1065 META_NAT, true); 1066 continue; 1067 } 1068 1069 if (phase == 1) { 1070 f2fs_ra_node_page(sbi, nid); 1071 continue; 1072 } 1073 1074 /* Get an inode by ino with checking validity */ 1075 if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs)) 1076 continue; 1077 1078 if (phase == 2) { 1079 f2fs_ra_node_page(sbi, dni.ino); 1080 continue; 1081 } 1082 1083 ofs_in_node = le16_to_cpu(entry->ofs_in_node); 1084 1085 if (phase == 3) { 1086 inode = f2fs_iget(sb, dni.ino); 1087 if (IS_ERR(inode) || is_bad_inode(inode)) { 1088 set_sbi_flag(sbi, SBI_NEED_FSCK); 1089 continue; 1090 } 1091 1092 if (!down_write_trylock( 1093 &F2FS_I(inode)->i_gc_rwsem[WRITE])) { 1094 iput(inode); 1095 sbi->skipped_gc_rwsem++; 1096 continue; 1097 } 1098 1099 start_bidx = f2fs_start_bidx_of_node(nofs, inode) + 1100 ofs_in_node; 1101 1102 if (f2fs_post_read_required(inode)) { 1103 int err = ra_data_block(inode, start_bidx); 1104 1105 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 1106 if (err) { 1107 iput(inode); 1108 continue; 1109 } 1110 add_gc_inode(gc_list, inode); 1111 continue; 1112 } 1113 1114 data_page = f2fs_get_read_data_page(inode, 1115 start_bidx, REQ_RAHEAD, true); 1116 up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); 1117 if (IS_ERR(data_page)) { 1118 iput(inode); 1119 continue; 1120 } 1121 1122 f2fs_put_page(data_page, 0); 1123 add_gc_inode(gc_list, inode); 1124 continue; 1125 } 1126 1127 /* phase 4 */ 1128 inode = find_gc_inode(gc_list, dni.ino); 1129 if (inode) { 1130 struct f2fs_inode_info *fi = F2FS_I(inode); 1131 bool locked = false; 1132 int err; 1133 1134 if (S_ISREG(inode->i_mode)) { 1135 if (!down_write_trylock(&fi->i_gc_rwsem[READ])) 1136 continue; 1137 if (!down_write_trylock( 1138 &fi->i_gc_rwsem[WRITE])) { 1139 sbi->skipped_gc_rwsem++; 1140 up_write(&fi->i_gc_rwsem[READ]); 1141 continue; 1142 } 1143 locked = true; 1144 1145 /* wait for all inflight aio data */ 1146 inode_dio_wait(inode); 1147 } 1148 1149 start_bidx = f2fs_start_bidx_of_node(nofs, inode) 1150 + ofs_in_node; 1151 if (f2fs_post_read_required(inode)) 1152 err = move_data_block(inode, start_bidx, 1153 gc_type, segno, off); 1154 else 1155 err = move_data_page(inode, start_bidx, gc_type, 1156 segno, off); 1157 1158 if (!err && (gc_type == FG_GC || 1159 f2fs_post_read_required(inode))) 1160 submitted++; 1161 1162 if (locked) { 1163 up_write(&fi->i_gc_rwsem[WRITE]); 1164 up_write(&fi->i_gc_rwsem[READ]); 1165 } 1166 1167 stat_inc_data_blk_count(sbi, 1, gc_type); 1168 } 1169 } 1170 1171 if (++phase < 5) 1172 goto next_step; 1173 1174 return submitted; 1175 } 1176 1177 static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim, 1178 int gc_type) 1179 { 1180 struct sit_info *sit_i = SIT_I(sbi); 1181 int ret; 1182 1183 down_write(&sit_i->sentry_lock); 1184 ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type, 1185 NO_CHECK_TYPE, LFS); 1186 up_write(&sit_i->sentry_lock); 1187 return ret; 1188 } 1189 1190 static int do_garbage_collect(struct f2fs_sb_info *sbi, 1191 unsigned int start_segno, 1192 struct gc_inode_list *gc_list, int gc_type) 1193 { 1194 struct page *sum_page; 1195 struct f2fs_summary_block *sum; 1196 struct blk_plug plug; 1197 unsigned int segno = start_segno; 1198 unsigned int end_segno = start_segno + sbi->segs_per_sec; 1199 int seg_freed = 0, migrated = 0; 1200 unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ? 1201 SUM_TYPE_DATA : SUM_TYPE_NODE; 1202 int submitted = 0; 1203 1204 if (__is_large_section(sbi)) 1205 end_segno = rounddown(end_segno, sbi->segs_per_sec); 1206 1207 /* readahead multi ssa blocks those have contiguous address */ 1208 if (__is_large_section(sbi)) 1209 f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno), 1210 end_segno - segno, META_SSA, true); 1211 1212 /* reference all summary page */ 1213 while (segno < end_segno) { 1214 sum_page = f2fs_get_sum_page(sbi, segno++); 1215 if (IS_ERR(sum_page)) { 1216 int err = PTR_ERR(sum_page); 1217 1218 end_segno = segno - 1; 1219 for (segno = start_segno; segno < end_segno; segno++) { 1220 sum_page = find_get_page(META_MAPPING(sbi), 1221 GET_SUM_BLOCK(sbi, segno)); 1222 f2fs_put_page(sum_page, 0); 1223 f2fs_put_page(sum_page, 0); 1224 } 1225 return err; 1226 } 1227 unlock_page(sum_page); 1228 } 1229 1230 blk_start_plug(&plug); 1231 1232 for (segno = start_segno; segno < end_segno; segno++) { 1233 1234 /* find segment summary of victim */ 1235 sum_page = find_get_page(META_MAPPING(sbi), 1236 GET_SUM_BLOCK(sbi, segno)); 1237 f2fs_put_page(sum_page, 0); 1238 1239 if (get_valid_blocks(sbi, segno, false) == 0) 1240 goto freed; 1241 if (gc_type == BG_GC && __is_large_section(sbi) && 1242 migrated >= sbi->migration_granularity) 1243 goto skip; 1244 if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi))) 1245 goto skip; 1246 1247 sum = page_address(sum_page); 1248 if (type != GET_SUM_TYPE((&sum->footer))) { 1249 f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT", 1250 segno, type, GET_SUM_TYPE((&sum->footer))); 1251 set_sbi_flag(sbi, SBI_NEED_FSCK); 1252 f2fs_stop_checkpoint(sbi, false); 1253 goto skip; 1254 } 1255 1256 /* 1257 * this is to avoid deadlock: 1258 * - lock_page(sum_page) - f2fs_replace_block 1259 * - check_valid_map() - down_write(sentry_lock) 1260 * - down_read(sentry_lock) - change_curseg() 1261 * - lock_page(sum_page) 1262 */ 1263 if (type == SUM_TYPE_NODE) 1264 submitted += gc_node_segment(sbi, sum->entries, segno, 1265 gc_type); 1266 else 1267 submitted += gc_data_segment(sbi, sum->entries, gc_list, 1268 segno, gc_type); 1269 1270 stat_inc_seg_count(sbi, type, gc_type); 1271 migrated++; 1272 1273 freed: 1274 if (gc_type == FG_GC && 1275 get_valid_blocks(sbi, segno, false) == 0) 1276 seg_freed++; 1277 1278 if (__is_large_section(sbi) && segno + 1 < end_segno) 1279 sbi->next_victim_seg[gc_type] = segno + 1; 1280 skip: 1281 f2fs_put_page(sum_page, 0); 1282 } 1283 1284 if (submitted) 1285 f2fs_submit_merged_write(sbi, 1286 (type == SUM_TYPE_NODE) ? NODE : DATA); 1287 1288 blk_finish_plug(&plug); 1289 1290 stat_inc_call_count(sbi->stat_info); 1291 1292 return seg_freed; 1293 } 1294 1295 int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, 1296 bool background, unsigned int segno) 1297 { 1298 int gc_type = sync ? FG_GC : BG_GC; 1299 int sec_freed = 0, seg_freed = 0, total_freed = 0; 1300 int ret = 0; 1301 struct cp_control cpc; 1302 unsigned int init_segno = segno; 1303 struct gc_inode_list gc_list = { 1304 .ilist = LIST_HEAD_INIT(gc_list.ilist), 1305 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS), 1306 }; 1307 unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC]; 1308 unsigned long long first_skipped; 1309 unsigned int skipped_round = 0, round = 0; 1310 1311 trace_f2fs_gc_begin(sbi->sb, sync, background, 1312 get_pages(sbi, F2FS_DIRTY_NODES), 1313 get_pages(sbi, F2FS_DIRTY_DENTS), 1314 get_pages(sbi, F2FS_DIRTY_IMETA), 1315 free_sections(sbi), 1316 free_segments(sbi), 1317 reserved_segments(sbi), 1318 prefree_segments(sbi)); 1319 1320 cpc.reason = __get_cp_reason(sbi); 1321 sbi->skipped_gc_rwsem = 0; 1322 first_skipped = last_skipped; 1323 gc_more: 1324 if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) { 1325 ret = -EINVAL; 1326 goto stop; 1327 } 1328 if (unlikely(f2fs_cp_error(sbi))) { 1329 ret = -EIO; 1330 goto stop; 1331 } 1332 1333 if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) { 1334 /* 1335 * For example, if there are many prefree_segments below given 1336 * threshold, we can make them free by checkpoint. Then, we 1337 * secure free segments which doesn't need fggc any more. 1338 */ 1339 if (prefree_segments(sbi) && 1340 !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) { 1341 ret = f2fs_write_checkpoint(sbi, &cpc); 1342 if (ret) 1343 goto stop; 1344 } 1345 if (has_not_enough_free_secs(sbi, 0, 0)) 1346 gc_type = FG_GC; 1347 } 1348 1349 /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */ 1350 if (gc_type == BG_GC && !background) { 1351 ret = -EINVAL; 1352 goto stop; 1353 } 1354 ret = __get_victim(sbi, &segno, gc_type); 1355 if (ret) 1356 goto stop; 1357 1358 seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type); 1359 if (gc_type == FG_GC && seg_freed == sbi->segs_per_sec) 1360 sec_freed++; 1361 total_freed += seg_freed; 1362 1363 if (gc_type == FG_GC) { 1364 if (sbi->skipped_atomic_files[FG_GC] > last_skipped || 1365 sbi->skipped_gc_rwsem) 1366 skipped_round++; 1367 last_skipped = sbi->skipped_atomic_files[FG_GC]; 1368 round++; 1369 } 1370 1371 if (gc_type == FG_GC && seg_freed) 1372 sbi->cur_victim_sec = NULL_SEGNO; 1373 1374 if (sync) 1375 goto stop; 1376 1377 if (has_not_enough_free_secs(sbi, sec_freed, 0)) { 1378 if (skipped_round <= MAX_SKIP_GC_COUNT || 1379 skipped_round * 2 < round) { 1380 segno = NULL_SEGNO; 1381 goto gc_more; 1382 } 1383 1384 if (first_skipped < last_skipped && 1385 (last_skipped - first_skipped) > 1386 sbi->skipped_gc_rwsem) { 1387 f2fs_drop_inmem_pages_all(sbi, true); 1388 segno = NULL_SEGNO; 1389 goto gc_more; 1390 } 1391 if (gc_type == FG_GC && !is_sbi_flag_set(sbi, SBI_CP_DISABLED)) 1392 ret = f2fs_write_checkpoint(sbi, &cpc); 1393 } 1394 stop: 1395 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0; 1396 SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno; 1397 1398 trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed, 1399 get_pages(sbi, F2FS_DIRTY_NODES), 1400 get_pages(sbi, F2FS_DIRTY_DENTS), 1401 get_pages(sbi, F2FS_DIRTY_IMETA), 1402 free_sections(sbi), 1403 free_segments(sbi), 1404 reserved_segments(sbi), 1405 prefree_segments(sbi)); 1406 1407 up_write(&sbi->gc_lock); 1408 1409 put_gc_inode(&gc_list); 1410 1411 if (sync && !ret) 1412 ret = sec_freed ? 0 : -EAGAIN; 1413 return ret; 1414 } 1415 1416 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi) 1417 { 1418 DIRTY_I(sbi)->v_ops = &default_v_ops; 1419 1420 sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES; 1421 1422 /* give warm/cold data area from slower device */ 1423 if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi)) 1424 SIT_I(sbi)->last_victim[ALLOC_NEXT] = 1425 GET_SEGNO(sbi, FDEV(0).end_blk) + 1; 1426 } 1427 1428 static int free_segment_range(struct f2fs_sb_info *sbi, 1429 unsigned int secs, bool gc_only) 1430 { 1431 unsigned int segno, next_inuse, start, end; 1432 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 }; 1433 int gc_mode, gc_type; 1434 int err = 0; 1435 int type; 1436 1437 /* Force block allocation for GC */ 1438 MAIN_SECS(sbi) -= secs; 1439 start = MAIN_SECS(sbi) * sbi->segs_per_sec; 1440 end = MAIN_SEGS(sbi) - 1; 1441 1442 mutex_lock(&DIRTY_I(sbi)->seglist_lock); 1443 for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++) 1444 if (SIT_I(sbi)->last_victim[gc_mode] >= start) 1445 SIT_I(sbi)->last_victim[gc_mode] = 0; 1446 1447 for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++) 1448 if (sbi->next_victim_seg[gc_type] >= start) 1449 sbi->next_victim_seg[gc_type] = NULL_SEGNO; 1450 mutex_unlock(&DIRTY_I(sbi)->seglist_lock); 1451 1452 /* Move out cursegs from the target range */ 1453 for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++) 1454 f2fs_allocate_segment_for_resize(sbi, type, start, end); 1455 1456 /* do GC to move out valid blocks in the range */ 1457 for (segno = start; segno <= end; segno += sbi->segs_per_sec) { 1458 struct gc_inode_list gc_list = { 1459 .ilist = LIST_HEAD_INIT(gc_list.ilist), 1460 .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS), 1461 }; 1462 1463 do_garbage_collect(sbi, segno, &gc_list, FG_GC); 1464 put_gc_inode(&gc_list); 1465 1466 if (!gc_only && get_valid_blocks(sbi, segno, true)) { 1467 err = -EAGAIN; 1468 goto out; 1469 } 1470 if (fatal_signal_pending(current)) { 1471 err = -ERESTARTSYS; 1472 goto out; 1473 } 1474 } 1475 if (gc_only) 1476 goto out; 1477 1478 err = f2fs_write_checkpoint(sbi, &cpc); 1479 if (err) 1480 goto out; 1481 1482 next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start); 1483 if (next_inuse <= end) { 1484 f2fs_err(sbi, "segno %u should be free but still inuse!", 1485 next_inuse); 1486 f2fs_bug_on(sbi, 1); 1487 } 1488 out: 1489 MAIN_SECS(sbi) += secs; 1490 return err; 1491 } 1492 1493 static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs) 1494 { 1495 struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi); 1496 int section_count; 1497 int segment_count; 1498 int segment_count_main; 1499 long long block_count; 1500 int segs = secs * sbi->segs_per_sec; 1501 1502 down_write(&sbi->sb_lock); 1503 1504 section_count = le32_to_cpu(raw_sb->section_count); 1505 segment_count = le32_to_cpu(raw_sb->segment_count); 1506 segment_count_main = le32_to_cpu(raw_sb->segment_count_main); 1507 block_count = le64_to_cpu(raw_sb->block_count); 1508 1509 raw_sb->section_count = cpu_to_le32(section_count + secs); 1510 raw_sb->segment_count = cpu_to_le32(segment_count + segs); 1511 raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs); 1512 raw_sb->block_count = cpu_to_le64(block_count + 1513 (long long)segs * sbi->blocks_per_seg); 1514 if (f2fs_is_multi_device(sbi)) { 1515 int last_dev = sbi->s_ndevs - 1; 1516 int dev_segs = 1517 le32_to_cpu(raw_sb->devs[last_dev].total_segments); 1518 1519 raw_sb->devs[last_dev].total_segments = 1520 cpu_to_le32(dev_segs + segs); 1521 } 1522 1523 up_write(&sbi->sb_lock); 1524 } 1525 1526 static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs) 1527 { 1528 int segs = secs * sbi->segs_per_sec; 1529 long long blks = (long long)segs * sbi->blocks_per_seg; 1530 long long user_block_count = 1531 le64_to_cpu(F2FS_CKPT(sbi)->user_block_count); 1532 1533 SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs; 1534 MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs; 1535 MAIN_SECS(sbi) += secs; 1536 FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs; 1537 FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs; 1538 F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks); 1539 1540 if (f2fs_is_multi_device(sbi)) { 1541 int last_dev = sbi->s_ndevs - 1; 1542 1543 FDEV(last_dev).total_segments = 1544 (int)FDEV(last_dev).total_segments + segs; 1545 FDEV(last_dev).end_blk = 1546 (long long)FDEV(last_dev).end_blk + blks; 1547 #ifdef CONFIG_BLK_DEV_ZONED 1548 FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz + 1549 (int)(blks >> sbi->log_blocks_per_blkz); 1550 #endif 1551 } 1552 } 1553 1554 int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count) 1555 { 1556 __u64 old_block_count, shrunk_blocks; 1557 struct cp_control cpc = { CP_RESIZE, 0, 0, 0 }; 1558 unsigned int secs; 1559 int err = 0; 1560 __u32 rem; 1561 1562 old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count); 1563 if (block_count > old_block_count) 1564 return -EINVAL; 1565 1566 if (f2fs_is_multi_device(sbi)) { 1567 int last_dev = sbi->s_ndevs - 1; 1568 __u64 last_segs = FDEV(last_dev).total_segments; 1569 1570 if (block_count + last_segs * sbi->blocks_per_seg <= 1571 old_block_count) 1572 return -EINVAL; 1573 } 1574 1575 /* new fs size should align to section size */ 1576 div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem); 1577 if (rem) 1578 return -EINVAL; 1579 1580 if (block_count == old_block_count) 1581 return 0; 1582 1583 if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) { 1584 f2fs_err(sbi, "Should run fsck to repair first."); 1585 return -EFSCORRUPTED; 1586 } 1587 1588 if (test_opt(sbi, DISABLE_CHECKPOINT)) { 1589 f2fs_err(sbi, "Checkpoint should be enabled."); 1590 return -EINVAL; 1591 } 1592 1593 shrunk_blocks = old_block_count - block_count; 1594 secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi)); 1595 1596 /* stop other GC */ 1597 if (!down_write_trylock(&sbi->gc_lock)) 1598 return -EAGAIN; 1599 1600 /* stop CP to protect MAIN_SEC in free_segment_range */ 1601 f2fs_lock_op(sbi); 1602 err = free_segment_range(sbi, secs, true); 1603 f2fs_unlock_op(sbi); 1604 up_write(&sbi->gc_lock); 1605 if (err) 1606 return err; 1607 1608 set_sbi_flag(sbi, SBI_IS_RESIZEFS); 1609 1610 freeze_super(sbi->sb); 1611 down_write(&sbi->gc_lock); 1612 mutex_lock(&sbi->cp_mutex); 1613 1614 spin_lock(&sbi->stat_lock); 1615 if (shrunk_blocks + valid_user_blocks(sbi) + 1616 sbi->current_reserved_blocks + sbi->unusable_block_count + 1617 F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count) 1618 err = -ENOSPC; 1619 else 1620 sbi->user_block_count -= shrunk_blocks; 1621 spin_unlock(&sbi->stat_lock); 1622 if (err) 1623 goto out_err; 1624 1625 err = free_segment_range(sbi, secs, false); 1626 if (err) 1627 goto recover_out; 1628 1629 update_sb_metadata(sbi, -secs); 1630 1631 err = f2fs_commit_super(sbi, false); 1632 if (err) { 1633 update_sb_metadata(sbi, secs); 1634 goto recover_out; 1635 } 1636 1637 update_fs_metadata(sbi, -secs); 1638 clear_sbi_flag(sbi, SBI_IS_RESIZEFS); 1639 set_sbi_flag(sbi, SBI_IS_DIRTY); 1640 1641 err = f2fs_write_checkpoint(sbi, &cpc); 1642 if (err) { 1643 update_fs_metadata(sbi, secs); 1644 update_sb_metadata(sbi, secs); 1645 f2fs_commit_super(sbi, false); 1646 } 1647 recover_out: 1648 if (err) { 1649 set_sbi_flag(sbi, SBI_NEED_FSCK); 1650 f2fs_err(sbi, "resize_fs failed, should run fsck to repair!"); 1651 1652 spin_lock(&sbi->stat_lock); 1653 sbi->user_block_count += shrunk_blocks; 1654 spin_unlock(&sbi->stat_lock); 1655 } 1656 out_err: 1657 mutex_unlock(&sbi->cp_mutex); 1658 up_write(&sbi->gc_lock); 1659 thaw_super(sbi->sb); 1660 clear_sbi_flag(sbi, SBI_IS_RESIZEFS); 1661 return err; 1662 } 1663