cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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checkpoint.c (48210B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * fs/f2fs/checkpoint.c
      4 *
      5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
      6 *             http://www.samsung.com/
      7 */
      8#include <linux/fs.h>
      9#include <linux/bio.h>
     10#include <linux/mpage.h>
     11#include <linux/writeback.h>
     12#include <linux/blkdev.h>
     13#include <linux/f2fs_fs.h>
     14#include <linux/pagevec.h>
     15#include <linux/swap.h>
     16#include <linux/kthread.h>
     17
     18#include "f2fs.h"
     19#include "node.h"
     20#include "segment.h"
     21#include "iostat.h"
     22#include <trace/events/f2fs.h>
     23
     24#define DEFAULT_CHECKPOINT_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
     25
     26static struct kmem_cache *ino_entry_slab;
     27struct kmem_cache *f2fs_inode_entry_slab;
     28
     29void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
     30{
     31	f2fs_build_fault_attr(sbi, 0, 0);
     32	set_ckpt_flags(sbi, CP_ERROR_FLAG);
     33	if (!end_io)
     34		f2fs_flush_merged_writes(sbi);
     35}
     36
     37/*
     38 * We guarantee no failure on the returned page.
     39 */
     40struct page *f2fs_grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
     41{
     42	struct address_space *mapping = META_MAPPING(sbi);
     43	struct page *page;
     44repeat:
     45	page = f2fs_grab_cache_page(mapping, index, false);
     46	if (!page) {
     47		cond_resched();
     48		goto repeat;
     49	}
     50	f2fs_wait_on_page_writeback(page, META, true, true);
     51	if (!PageUptodate(page))
     52		SetPageUptodate(page);
     53	return page;
     54}
     55
     56static struct page *__get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index,
     57							bool is_meta)
     58{
     59	struct address_space *mapping = META_MAPPING(sbi);
     60	struct page *page;
     61	struct f2fs_io_info fio = {
     62		.sbi = sbi,
     63		.type = META,
     64		.op = REQ_OP_READ,
     65		.op_flags = REQ_META | REQ_PRIO,
     66		.old_blkaddr = index,
     67		.new_blkaddr = index,
     68		.encrypted_page = NULL,
     69		.is_por = !is_meta,
     70	};
     71	int err;
     72
     73	if (unlikely(!is_meta))
     74		fio.op_flags &= ~REQ_META;
     75repeat:
     76	page = f2fs_grab_cache_page(mapping, index, false);
     77	if (!page) {
     78		cond_resched();
     79		goto repeat;
     80	}
     81	if (PageUptodate(page))
     82		goto out;
     83
     84	fio.page = page;
     85
     86	err = f2fs_submit_page_bio(&fio);
     87	if (err) {
     88		f2fs_put_page(page, 1);
     89		return ERR_PTR(err);
     90	}
     91
     92	f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
     93
     94	lock_page(page);
     95	if (unlikely(page->mapping != mapping)) {
     96		f2fs_put_page(page, 1);
     97		goto repeat;
     98	}
     99
    100	if (unlikely(!PageUptodate(page))) {
    101		f2fs_handle_page_eio(sbi, page->index, META);
    102		f2fs_put_page(page, 1);
    103		return ERR_PTR(-EIO);
    104	}
    105out:
    106	return page;
    107}
    108
    109struct page *f2fs_get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
    110{
    111	return __get_meta_page(sbi, index, true);
    112}
    113
    114struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index)
    115{
    116	struct page *page;
    117	int count = 0;
    118
    119retry:
    120	page = __get_meta_page(sbi, index, true);
    121	if (IS_ERR(page)) {
    122		if (PTR_ERR(page) == -EIO &&
    123				++count <= DEFAULT_RETRY_IO_COUNT)
    124			goto retry;
    125		f2fs_stop_checkpoint(sbi, false);
    126	}
    127	return page;
    128}
    129
    130/* for POR only */
    131struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
    132{
    133	return __get_meta_page(sbi, index, false);
    134}
    135
    136static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
    137							int type)
    138{
    139	struct seg_entry *se;
    140	unsigned int segno, offset;
    141	bool exist;
    142
    143	if (type != DATA_GENERIC_ENHANCE && type != DATA_GENERIC_ENHANCE_READ)
    144		return true;
    145
    146	segno = GET_SEGNO(sbi, blkaddr);
    147	offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
    148	se = get_seg_entry(sbi, segno);
    149
    150	exist = f2fs_test_bit(offset, se->cur_valid_map);
    151	if (!exist && type == DATA_GENERIC_ENHANCE) {
    152		f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d",
    153			 blkaddr, exist);
    154		set_sbi_flag(sbi, SBI_NEED_FSCK);
    155		dump_stack();
    156	}
    157	return exist;
    158}
    159
    160bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
    161					block_t blkaddr, int type)
    162{
    163	switch (type) {
    164	case META_NAT:
    165		break;
    166	case META_SIT:
    167		if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
    168			return false;
    169		break;
    170	case META_SSA:
    171		if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
    172			blkaddr < SM_I(sbi)->ssa_blkaddr))
    173			return false;
    174		break;
    175	case META_CP:
    176		if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
    177			blkaddr < __start_cp_addr(sbi)))
    178			return false;
    179		break;
    180	case META_POR:
    181		if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
    182			blkaddr < MAIN_BLKADDR(sbi)))
    183			return false;
    184		break;
    185	case DATA_GENERIC:
    186	case DATA_GENERIC_ENHANCE:
    187	case DATA_GENERIC_ENHANCE_READ:
    188		if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
    189				blkaddr < MAIN_BLKADDR(sbi))) {
    190			f2fs_warn(sbi, "access invalid blkaddr:%u",
    191				  blkaddr);
    192			set_sbi_flag(sbi, SBI_NEED_FSCK);
    193			dump_stack();
    194			return false;
    195		} else {
    196			return __is_bitmap_valid(sbi, blkaddr, type);
    197		}
    198		break;
    199	case META_GENERIC:
    200		if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
    201			blkaddr >= MAIN_BLKADDR(sbi)))
    202			return false;
    203		break;
    204	default:
    205		BUG();
    206	}
    207
    208	return true;
    209}
    210
    211/*
    212 * Readahead CP/NAT/SIT/SSA/POR pages
    213 */
    214int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
    215							int type, bool sync)
    216{
    217	struct page *page;
    218	block_t blkno = start;
    219	struct f2fs_io_info fio = {
    220		.sbi = sbi,
    221		.type = META,
    222		.op = REQ_OP_READ,
    223		.op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD,
    224		.encrypted_page = NULL,
    225		.in_list = false,
    226		.is_por = (type == META_POR),
    227	};
    228	struct blk_plug plug;
    229	int err;
    230
    231	if (unlikely(type == META_POR))
    232		fio.op_flags &= ~REQ_META;
    233
    234	blk_start_plug(&plug);
    235	for (; nrpages-- > 0; blkno++) {
    236
    237		if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
    238			goto out;
    239
    240		switch (type) {
    241		case META_NAT:
    242			if (unlikely(blkno >=
    243					NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid)))
    244				blkno = 0;
    245			/* get nat block addr */
    246			fio.new_blkaddr = current_nat_addr(sbi,
    247					blkno * NAT_ENTRY_PER_BLOCK);
    248			break;
    249		case META_SIT:
    250			if (unlikely(blkno >= TOTAL_SEGS(sbi)))
    251				goto out;
    252			/* get sit block addr */
    253			fio.new_blkaddr = current_sit_addr(sbi,
    254					blkno * SIT_ENTRY_PER_BLOCK);
    255			break;
    256		case META_SSA:
    257		case META_CP:
    258		case META_POR:
    259			fio.new_blkaddr = blkno;
    260			break;
    261		default:
    262			BUG();
    263		}
    264
    265		page = f2fs_grab_cache_page(META_MAPPING(sbi),
    266						fio.new_blkaddr, false);
    267		if (!page)
    268			continue;
    269		if (PageUptodate(page)) {
    270			f2fs_put_page(page, 1);
    271			continue;
    272		}
    273
    274		fio.page = page;
    275		err = f2fs_submit_page_bio(&fio);
    276		f2fs_put_page(page, err ? 1 : 0);
    277
    278		if (!err)
    279			f2fs_update_iostat(sbi, FS_META_READ_IO, F2FS_BLKSIZE);
    280	}
    281out:
    282	blk_finish_plug(&plug);
    283	return blkno - start;
    284}
    285
    286void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index,
    287							unsigned int ra_blocks)
    288{
    289	struct page *page;
    290	bool readahead = false;
    291
    292	if (ra_blocks == RECOVERY_MIN_RA_BLOCKS)
    293		return;
    294
    295	page = find_get_page(META_MAPPING(sbi), index);
    296	if (!page || !PageUptodate(page))
    297		readahead = true;
    298	f2fs_put_page(page, 0);
    299
    300	if (readahead)
    301		f2fs_ra_meta_pages(sbi, index, ra_blocks, META_POR, true);
    302}
    303
    304static int __f2fs_write_meta_page(struct page *page,
    305				struct writeback_control *wbc,
    306				enum iostat_type io_type)
    307{
    308	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
    309
    310	trace_f2fs_writepage(page, META);
    311
    312	if (unlikely(f2fs_cp_error(sbi)))
    313		goto redirty_out;
    314	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
    315		goto redirty_out;
    316	if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
    317		goto redirty_out;
    318
    319	f2fs_do_write_meta_page(sbi, page, io_type);
    320	dec_page_count(sbi, F2FS_DIRTY_META);
    321
    322	if (wbc->for_reclaim)
    323		f2fs_submit_merged_write_cond(sbi, NULL, page, 0, META);
    324
    325	unlock_page(page);
    326
    327	if (unlikely(f2fs_cp_error(sbi)))
    328		f2fs_submit_merged_write(sbi, META);
    329
    330	return 0;
    331
    332redirty_out:
    333	redirty_page_for_writepage(wbc, page);
    334	return AOP_WRITEPAGE_ACTIVATE;
    335}
    336
    337static int f2fs_write_meta_page(struct page *page,
    338				struct writeback_control *wbc)
    339{
    340	return __f2fs_write_meta_page(page, wbc, FS_META_IO);
    341}
    342
    343static int f2fs_write_meta_pages(struct address_space *mapping,
    344				struct writeback_control *wbc)
    345{
    346	struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
    347	long diff, written;
    348
    349	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
    350		goto skip_write;
    351
    352	/* collect a number of dirty meta pages and write together */
    353	if (wbc->sync_mode != WB_SYNC_ALL &&
    354			get_pages(sbi, F2FS_DIRTY_META) <
    355					nr_pages_to_skip(sbi, META))
    356		goto skip_write;
    357
    358	/* if locked failed, cp will flush dirty pages instead */
    359	if (!f2fs_down_write_trylock(&sbi->cp_global_sem))
    360		goto skip_write;
    361
    362	trace_f2fs_writepages(mapping->host, wbc, META);
    363	diff = nr_pages_to_write(sbi, META, wbc);
    364	written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
    365	f2fs_up_write(&sbi->cp_global_sem);
    366	wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
    367	return 0;
    368
    369skip_write:
    370	wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
    371	trace_f2fs_writepages(mapping->host, wbc, META);
    372	return 0;
    373}
    374
    375long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
    376				long nr_to_write, enum iostat_type io_type)
    377{
    378	struct address_space *mapping = META_MAPPING(sbi);
    379	pgoff_t index = 0, prev = ULONG_MAX;
    380	struct pagevec pvec;
    381	long nwritten = 0;
    382	int nr_pages;
    383	struct writeback_control wbc = {
    384		.for_reclaim = 0,
    385	};
    386	struct blk_plug plug;
    387
    388	pagevec_init(&pvec);
    389
    390	blk_start_plug(&plug);
    391
    392	while ((nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
    393				PAGECACHE_TAG_DIRTY))) {
    394		int i;
    395
    396		for (i = 0; i < nr_pages; i++) {
    397			struct page *page = pvec.pages[i];
    398
    399			if (prev == ULONG_MAX)
    400				prev = page->index - 1;
    401			if (nr_to_write != LONG_MAX && page->index != prev + 1) {
    402				pagevec_release(&pvec);
    403				goto stop;
    404			}
    405
    406			lock_page(page);
    407
    408			if (unlikely(page->mapping != mapping)) {
    409continue_unlock:
    410				unlock_page(page);
    411				continue;
    412			}
    413			if (!PageDirty(page)) {
    414				/* someone wrote it for us */
    415				goto continue_unlock;
    416			}
    417
    418			f2fs_wait_on_page_writeback(page, META, true, true);
    419
    420			if (!clear_page_dirty_for_io(page))
    421				goto continue_unlock;
    422
    423			if (__f2fs_write_meta_page(page, &wbc, io_type)) {
    424				unlock_page(page);
    425				break;
    426			}
    427			nwritten++;
    428			prev = page->index;
    429			if (unlikely(nwritten >= nr_to_write))
    430				break;
    431		}
    432		pagevec_release(&pvec);
    433		cond_resched();
    434	}
    435stop:
    436	if (nwritten)
    437		f2fs_submit_merged_write(sbi, type);
    438
    439	blk_finish_plug(&plug);
    440
    441	return nwritten;
    442}
    443
    444static bool f2fs_dirty_meta_folio(struct address_space *mapping,
    445		struct folio *folio)
    446{
    447	trace_f2fs_set_page_dirty(&folio->page, META);
    448
    449	if (!folio_test_uptodate(folio))
    450		folio_mark_uptodate(folio);
    451	if (!folio_test_dirty(folio)) {
    452		filemap_dirty_folio(mapping, folio);
    453		inc_page_count(F2FS_M_SB(mapping), F2FS_DIRTY_META);
    454		set_page_private_reference(&folio->page);
    455		return true;
    456	}
    457	return false;
    458}
    459
    460const struct address_space_operations f2fs_meta_aops = {
    461	.writepage	= f2fs_write_meta_page,
    462	.writepages	= f2fs_write_meta_pages,
    463	.dirty_folio	= f2fs_dirty_meta_folio,
    464	.invalidate_folio = f2fs_invalidate_folio,
    465	.release_folio	= f2fs_release_folio,
    466#ifdef CONFIG_MIGRATION
    467	.migratepage    = f2fs_migrate_page,
    468#endif
    469};
    470
    471static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
    472						unsigned int devidx, int type)
    473{
    474	struct inode_management *im = &sbi->im[type];
    475	struct ino_entry *e = NULL, *new = NULL;
    476
    477	if (type == FLUSH_INO) {
    478		rcu_read_lock();
    479		e = radix_tree_lookup(&im->ino_root, ino);
    480		rcu_read_unlock();
    481	}
    482
    483retry:
    484	if (!e)
    485		new = f2fs_kmem_cache_alloc(ino_entry_slab,
    486						GFP_NOFS, true, NULL);
    487
    488	radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
    489
    490	spin_lock(&im->ino_lock);
    491	e = radix_tree_lookup(&im->ino_root, ino);
    492	if (!e) {
    493		if (!new) {
    494			spin_unlock(&im->ino_lock);
    495			goto retry;
    496		}
    497		e = new;
    498		if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
    499			f2fs_bug_on(sbi, 1);
    500
    501		memset(e, 0, sizeof(struct ino_entry));
    502		e->ino = ino;
    503
    504		list_add_tail(&e->list, &im->ino_list);
    505		if (type != ORPHAN_INO)
    506			im->ino_num++;
    507	}
    508
    509	if (type == FLUSH_INO)
    510		f2fs_set_bit(devidx, (char *)&e->dirty_device);
    511
    512	spin_unlock(&im->ino_lock);
    513	radix_tree_preload_end();
    514
    515	if (new && e != new)
    516		kmem_cache_free(ino_entry_slab, new);
    517}
    518
    519static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
    520{
    521	struct inode_management *im = &sbi->im[type];
    522	struct ino_entry *e;
    523
    524	spin_lock(&im->ino_lock);
    525	e = radix_tree_lookup(&im->ino_root, ino);
    526	if (e) {
    527		list_del(&e->list);
    528		radix_tree_delete(&im->ino_root, ino);
    529		im->ino_num--;
    530		spin_unlock(&im->ino_lock);
    531		kmem_cache_free(ino_entry_slab, e);
    532		return;
    533	}
    534	spin_unlock(&im->ino_lock);
    535}
    536
    537void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
    538{
    539	/* add new dirty ino entry into list */
    540	__add_ino_entry(sbi, ino, 0, type);
    541}
    542
    543void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)
    544{
    545	/* remove dirty ino entry from list */
    546	__remove_ino_entry(sbi, ino, type);
    547}
    548
    549/* mode should be APPEND_INO, UPDATE_INO or TRANS_DIR_INO */
    550bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
    551{
    552	struct inode_management *im = &sbi->im[mode];
    553	struct ino_entry *e;
    554
    555	spin_lock(&im->ino_lock);
    556	e = radix_tree_lookup(&im->ino_root, ino);
    557	spin_unlock(&im->ino_lock);
    558	return e ? true : false;
    559}
    560
    561void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all)
    562{
    563	struct ino_entry *e, *tmp;
    564	int i;
    565
    566	for (i = all ? ORPHAN_INO : APPEND_INO; i < MAX_INO_ENTRY; i++) {
    567		struct inode_management *im = &sbi->im[i];
    568
    569		spin_lock(&im->ino_lock);
    570		list_for_each_entry_safe(e, tmp, &im->ino_list, list) {
    571			list_del(&e->list);
    572			radix_tree_delete(&im->ino_root, e->ino);
    573			kmem_cache_free(ino_entry_slab, e);
    574			im->ino_num--;
    575		}
    576		spin_unlock(&im->ino_lock);
    577	}
    578}
    579
    580void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
    581					unsigned int devidx, int type)
    582{
    583	__add_ino_entry(sbi, ino, devidx, type);
    584}
    585
    586bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino,
    587					unsigned int devidx, int type)
    588{
    589	struct inode_management *im = &sbi->im[type];
    590	struct ino_entry *e;
    591	bool is_dirty = false;
    592
    593	spin_lock(&im->ino_lock);
    594	e = radix_tree_lookup(&im->ino_root, ino);
    595	if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device))
    596		is_dirty = true;
    597	spin_unlock(&im->ino_lock);
    598	return is_dirty;
    599}
    600
    601int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
    602{
    603	struct inode_management *im = &sbi->im[ORPHAN_INO];
    604	int err = 0;
    605
    606	spin_lock(&im->ino_lock);
    607
    608	if (time_to_inject(sbi, FAULT_ORPHAN)) {
    609		spin_unlock(&im->ino_lock);
    610		f2fs_show_injection_info(sbi, FAULT_ORPHAN);
    611		return -ENOSPC;
    612	}
    613
    614	if (unlikely(im->ino_num >= sbi->max_orphans))
    615		err = -ENOSPC;
    616	else
    617		im->ino_num++;
    618	spin_unlock(&im->ino_lock);
    619
    620	return err;
    621}
    622
    623void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi)
    624{
    625	struct inode_management *im = &sbi->im[ORPHAN_INO];
    626
    627	spin_lock(&im->ino_lock);
    628	f2fs_bug_on(sbi, im->ino_num == 0);
    629	im->ino_num--;
    630	spin_unlock(&im->ino_lock);
    631}
    632
    633void f2fs_add_orphan_inode(struct inode *inode)
    634{
    635	/* add new orphan ino entry into list */
    636	__add_ino_entry(F2FS_I_SB(inode), inode->i_ino, 0, ORPHAN_INO);
    637	f2fs_update_inode_page(inode);
    638}
    639
    640void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
    641{
    642	/* remove orphan entry from orphan list */
    643	__remove_ino_entry(sbi, ino, ORPHAN_INO);
    644}
    645
    646static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
    647{
    648	struct inode *inode;
    649	struct node_info ni;
    650	int err;
    651
    652	inode = f2fs_iget_retry(sbi->sb, ino);
    653	if (IS_ERR(inode)) {
    654		/*
    655		 * there should be a bug that we can't find the entry
    656		 * to orphan inode.
    657		 */
    658		f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT);
    659		return PTR_ERR(inode);
    660	}
    661
    662	err = f2fs_dquot_initialize(inode);
    663	if (err) {
    664		iput(inode);
    665		goto err_out;
    666	}
    667
    668	clear_nlink(inode);
    669
    670	/* truncate all the data during iput */
    671	iput(inode);
    672
    673	err = f2fs_get_node_info(sbi, ino, &ni, false);
    674	if (err)
    675		goto err_out;
    676
    677	/* ENOMEM was fully retried in f2fs_evict_inode. */
    678	if (ni.blk_addr != NULL_ADDR) {
    679		err = -EIO;
    680		goto err_out;
    681	}
    682	return 0;
    683
    684err_out:
    685	set_sbi_flag(sbi, SBI_NEED_FSCK);
    686	f2fs_warn(sbi, "%s: orphan failed (ino=%x), run fsck to fix.",
    687		  __func__, ino);
    688	return err;
    689}
    690
    691int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
    692{
    693	block_t start_blk, orphan_blocks, i, j;
    694	unsigned int s_flags = sbi->sb->s_flags;
    695	int err = 0;
    696#ifdef CONFIG_QUOTA
    697	int quota_enabled;
    698#endif
    699
    700	if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG))
    701		return 0;
    702
    703	if (bdev_read_only(sbi->sb->s_bdev)) {
    704		f2fs_info(sbi, "write access unavailable, skipping orphan cleanup");
    705		return 0;
    706	}
    707
    708	if (s_flags & SB_RDONLY) {
    709		f2fs_info(sbi, "orphan cleanup on readonly fs");
    710		sbi->sb->s_flags &= ~SB_RDONLY;
    711	}
    712
    713#ifdef CONFIG_QUOTA
    714	/*
    715	 * Turn on quotas which were not enabled for read-only mounts if
    716	 * filesystem has quota feature, so that they are updated correctly.
    717	 */
    718	quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
    719#endif
    720
    721	start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi);
    722	orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi);
    723
    724	f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true);
    725
    726	for (i = 0; i < orphan_blocks; i++) {
    727		struct page *page;
    728		struct f2fs_orphan_block *orphan_blk;
    729
    730		page = f2fs_get_meta_page(sbi, start_blk + i);
    731		if (IS_ERR(page)) {
    732			err = PTR_ERR(page);
    733			goto out;
    734		}
    735
    736		orphan_blk = (struct f2fs_orphan_block *)page_address(page);
    737		for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
    738			nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
    739
    740			err = recover_orphan_inode(sbi, ino);
    741			if (err) {
    742				f2fs_put_page(page, 1);
    743				goto out;
    744			}
    745		}
    746		f2fs_put_page(page, 1);
    747	}
    748	/* clear Orphan Flag */
    749	clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG);
    750out:
    751	set_sbi_flag(sbi, SBI_IS_RECOVERED);
    752
    753#ifdef CONFIG_QUOTA
    754	/* Turn quotas off */
    755	if (quota_enabled)
    756		f2fs_quota_off_umount(sbi->sb);
    757#endif
    758	sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
    759
    760	return err;
    761}
    762
    763static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
    764{
    765	struct list_head *head;
    766	struct f2fs_orphan_block *orphan_blk = NULL;
    767	unsigned int nentries = 0;
    768	unsigned short index = 1;
    769	unsigned short orphan_blocks;
    770	struct page *page = NULL;
    771	struct ino_entry *orphan = NULL;
    772	struct inode_management *im = &sbi->im[ORPHAN_INO];
    773
    774	orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num);
    775
    776	/*
    777	 * we don't need to do spin_lock(&im->ino_lock) here, since all the
    778	 * orphan inode operations are covered under f2fs_lock_op().
    779	 * And, spin_lock should be avoided due to page operations below.
    780	 */
    781	head = &im->ino_list;
    782
    783	/* loop for each orphan inode entry and write them in Jornal block */
    784	list_for_each_entry(orphan, head, list) {
    785		if (!page) {
    786			page = f2fs_grab_meta_page(sbi, start_blk++);
    787			orphan_blk =
    788				(struct f2fs_orphan_block *)page_address(page);
    789			memset(orphan_blk, 0, sizeof(*orphan_blk));
    790		}
    791
    792		orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
    793
    794		if (nentries == F2FS_ORPHANS_PER_BLOCK) {
    795			/*
    796			 * an orphan block is full of 1020 entries,
    797			 * then we need to flush current orphan blocks
    798			 * and bring another one in memory
    799			 */
    800			orphan_blk->blk_addr = cpu_to_le16(index);
    801			orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
    802			orphan_blk->entry_count = cpu_to_le32(nentries);
    803			set_page_dirty(page);
    804			f2fs_put_page(page, 1);
    805			index++;
    806			nentries = 0;
    807			page = NULL;
    808		}
    809	}
    810
    811	if (page) {
    812		orphan_blk->blk_addr = cpu_to_le16(index);
    813		orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
    814		orphan_blk->entry_count = cpu_to_le32(nentries);
    815		set_page_dirty(page);
    816		f2fs_put_page(page, 1);
    817	}
    818}
    819
    820static __u32 f2fs_checkpoint_chksum(struct f2fs_sb_info *sbi,
    821						struct f2fs_checkpoint *ckpt)
    822{
    823	unsigned int chksum_ofs = le32_to_cpu(ckpt->checksum_offset);
    824	__u32 chksum;
    825
    826	chksum = f2fs_crc32(sbi, ckpt, chksum_ofs);
    827	if (chksum_ofs < CP_CHKSUM_OFFSET) {
    828		chksum_ofs += sizeof(chksum);
    829		chksum = f2fs_chksum(sbi, chksum, (__u8 *)ckpt + chksum_ofs,
    830						F2FS_BLKSIZE - chksum_ofs);
    831	}
    832	return chksum;
    833}
    834
    835static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr,
    836		struct f2fs_checkpoint **cp_block, struct page **cp_page,
    837		unsigned long long *version)
    838{
    839	size_t crc_offset = 0;
    840	__u32 crc;
    841
    842	*cp_page = f2fs_get_meta_page(sbi, cp_addr);
    843	if (IS_ERR(*cp_page))
    844		return PTR_ERR(*cp_page);
    845
    846	*cp_block = (struct f2fs_checkpoint *)page_address(*cp_page);
    847
    848	crc_offset = le32_to_cpu((*cp_block)->checksum_offset);
    849	if (crc_offset < CP_MIN_CHKSUM_OFFSET ||
    850			crc_offset > CP_CHKSUM_OFFSET) {
    851		f2fs_put_page(*cp_page, 1);
    852		f2fs_warn(sbi, "invalid crc_offset: %zu", crc_offset);
    853		return -EINVAL;
    854	}
    855
    856	crc = f2fs_checkpoint_chksum(sbi, *cp_block);
    857	if (crc != cur_cp_crc(*cp_block)) {
    858		f2fs_put_page(*cp_page, 1);
    859		f2fs_warn(sbi, "invalid crc value");
    860		return -EINVAL;
    861	}
    862
    863	*version = cur_cp_version(*cp_block);
    864	return 0;
    865}
    866
    867static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
    868				block_t cp_addr, unsigned long long *version)
    869{
    870	struct page *cp_page_1 = NULL, *cp_page_2 = NULL;
    871	struct f2fs_checkpoint *cp_block = NULL;
    872	unsigned long long cur_version = 0, pre_version = 0;
    873	unsigned int cp_blocks;
    874	int err;
    875
    876	err = get_checkpoint_version(sbi, cp_addr, &cp_block,
    877					&cp_page_1, version);
    878	if (err)
    879		return NULL;
    880
    881	cp_blocks = le32_to_cpu(cp_block->cp_pack_total_block_count);
    882
    883	if (cp_blocks > sbi->blocks_per_seg || cp_blocks <= F2FS_CP_PACKS) {
    884		f2fs_warn(sbi, "invalid cp_pack_total_block_count:%u",
    885			  le32_to_cpu(cp_block->cp_pack_total_block_count));
    886		goto invalid_cp;
    887	}
    888	pre_version = *version;
    889
    890	cp_addr += cp_blocks - 1;
    891	err = get_checkpoint_version(sbi, cp_addr, &cp_block,
    892					&cp_page_2, version);
    893	if (err)
    894		goto invalid_cp;
    895	cur_version = *version;
    896
    897	if (cur_version == pre_version) {
    898		*version = cur_version;
    899		f2fs_put_page(cp_page_2, 1);
    900		return cp_page_1;
    901	}
    902	f2fs_put_page(cp_page_2, 1);
    903invalid_cp:
    904	f2fs_put_page(cp_page_1, 1);
    905	return NULL;
    906}
    907
    908int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi)
    909{
    910	struct f2fs_checkpoint *cp_block;
    911	struct f2fs_super_block *fsb = sbi->raw_super;
    912	struct page *cp1, *cp2, *cur_page;
    913	unsigned long blk_size = sbi->blocksize;
    914	unsigned long long cp1_version = 0, cp2_version = 0;
    915	unsigned long long cp_start_blk_no;
    916	unsigned int cp_blks = 1 + __cp_payload(sbi);
    917	block_t cp_blk_no;
    918	int i;
    919	int err;
    920
    921	sbi->ckpt = f2fs_kvzalloc(sbi, array_size(blk_size, cp_blks),
    922				  GFP_KERNEL);
    923	if (!sbi->ckpt)
    924		return -ENOMEM;
    925	/*
    926	 * Finding out valid cp block involves read both
    927	 * sets( cp pack 1 and cp pack 2)
    928	 */
    929	cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
    930	cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
    931
    932	/* The second checkpoint pack should start at the next segment */
    933	cp_start_blk_no += ((unsigned long long)1) <<
    934				le32_to_cpu(fsb->log_blocks_per_seg);
    935	cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
    936
    937	if (cp1 && cp2) {
    938		if (ver_after(cp2_version, cp1_version))
    939			cur_page = cp2;
    940		else
    941			cur_page = cp1;
    942	} else if (cp1) {
    943		cur_page = cp1;
    944	} else if (cp2) {
    945		cur_page = cp2;
    946	} else {
    947		err = -EFSCORRUPTED;
    948		goto fail_no_cp;
    949	}
    950
    951	cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
    952	memcpy(sbi->ckpt, cp_block, blk_size);
    953
    954	if (cur_page == cp1)
    955		sbi->cur_cp_pack = 1;
    956	else
    957		sbi->cur_cp_pack = 2;
    958
    959	/* Sanity checking of checkpoint */
    960	if (f2fs_sanity_check_ckpt(sbi)) {
    961		err = -EFSCORRUPTED;
    962		goto free_fail_no_cp;
    963	}
    964
    965	if (cp_blks <= 1)
    966		goto done;
    967
    968	cp_blk_no = le32_to_cpu(fsb->cp_blkaddr);
    969	if (cur_page == cp2)
    970		cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg);
    971
    972	for (i = 1; i < cp_blks; i++) {
    973		void *sit_bitmap_ptr;
    974		unsigned char *ckpt = (unsigned char *)sbi->ckpt;
    975
    976		cur_page = f2fs_get_meta_page(sbi, cp_blk_no + i);
    977		if (IS_ERR(cur_page)) {
    978			err = PTR_ERR(cur_page);
    979			goto free_fail_no_cp;
    980		}
    981		sit_bitmap_ptr = page_address(cur_page);
    982		memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size);
    983		f2fs_put_page(cur_page, 1);
    984	}
    985done:
    986	f2fs_put_page(cp1, 1);
    987	f2fs_put_page(cp2, 1);
    988	return 0;
    989
    990free_fail_no_cp:
    991	f2fs_put_page(cp1, 1);
    992	f2fs_put_page(cp2, 1);
    993fail_no_cp:
    994	kvfree(sbi->ckpt);
    995	return err;
    996}
    997
    998static void __add_dirty_inode(struct inode *inode, enum inode_type type)
    999{
   1000	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
   1001	int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
   1002
   1003	if (is_inode_flag_set(inode, flag))
   1004		return;
   1005
   1006	set_inode_flag(inode, flag);
   1007	list_add_tail(&F2FS_I(inode)->dirty_list, &sbi->inode_list[type]);
   1008	stat_inc_dirty_inode(sbi, type);
   1009}
   1010
   1011static void __remove_dirty_inode(struct inode *inode, enum inode_type type)
   1012{
   1013	int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE;
   1014
   1015	if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag))
   1016		return;
   1017
   1018	list_del_init(&F2FS_I(inode)->dirty_list);
   1019	clear_inode_flag(inode, flag);
   1020	stat_dec_dirty_inode(F2FS_I_SB(inode), type);
   1021}
   1022
   1023void f2fs_update_dirty_folio(struct inode *inode, struct folio *folio)
   1024{
   1025	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
   1026	enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
   1027
   1028	if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
   1029			!S_ISLNK(inode->i_mode))
   1030		return;
   1031
   1032	spin_lock(&sbi->inode_lock[type]);
   1033	if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH))
   1034		__add_dirty_inode(inode, type);
   1035	inode_inc_dirty_pages(inode);
   1036	spin_unlock(&sbi->inode_lock[type]);
   1037
   1038	set_page_private_reference(&folio->page);
   1039}
   1040
   1041void f2fs_remove_dirty_inode(struct inode *inode)
   1042{
   1043	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
   1044	enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE;
   1045
   1046	if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
   1047			!S_ISLNK(inode->i_mode))
   1048		return;
   1049
   1050	if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH))
   1051		return;
   1052
   1053	spin_lock(&sbi->inode_lock[type]);
   1054	__remove_dirty_inode(inode, type);
   1055	spin_unlock(&sbi->inode_lock[type]);
   1056}
   1057
   1058int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
   1059{
   1060	struct list_head *head;
   1061	struct inode *inode;
   1062	struct f2fs_inode_info *fi;
   1063	bool is_dir = (type == DIR_INODE);
   1064	unsigned long ino = 0;
   1065
   1066	trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
   1067				get_pages(sbi, is_dir ?
   1068				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
   1069retry:
   1070	if (unlikely(f2fs_cp_error(sbi))) {
   1071		trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
   1072				get_pages(sbi, is_dir ?
   1073				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
   1074		return -EIO;
   1075	}
   1076
   1077	spin_lock(&sbi->inode_lock[type]);
   1078
   1079	head = &sbi->inode_list[type];
   1080	if (list_empty(head)) {
   1081		spin_unlock(&sbi->inode_lock[type]);
   1082		trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir,
   1083				get_pages(sbi, is_dir ?
   1084				F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA));
   1085		return 0;
   1086	}
   1087	fi = list_first_entry(head, struct f2fs_inode_info, dirty_list);
   1088	inode = igrab(&fi->vfs_inode);
   1089	spin_unlock(&sbi->inode_lock[type]);
   1090	if (inode) {
   1091		unsigned long cur_ino = inode->i_ino;
   1092
   1093		F2FS_I(inode)->cp_task = current;
   1094
   1095		filemap_fdatawrite(inode->i_mapping);
   1096
   1097		F2FS_I(inode)->cp_task = NULL;
   1098
   1099		iput(inode);
   1100		/* We need to give cpu to another writers. */
   1101		if (ino == cur_ino)
   1102			cond_resched();
   1103		else
   1104			ino = cur_ino;
   1105	} else {
   1106		/*
   1107		 * We should submit bio, since it exists several
   1108		 * wribacking dentry pages in the freeing inode.
   1109		 */
   1110		f2fs_submit_merged_write(sbi, DATA);
   1111		cond_resched();
   1112	}
   1113	goto retry;
   1114}
   1115
   1116int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi)
   1117{
   1118	struct list_head *head = &sbi->inode_list[DIRTY_META];
   1119	struct inode *inode;
   1120	struct f2fs_inode_info *fi;
   1121	s64 total = get_pages(sbi, F2FS_DIRTY_IMETA);
   1122
   1123	while (total--) {
   1124		if (unlikely(f2fs_cp_error(sbi)))
   1125			return -EIO;
   1126
   1127		spin_lock(&sbi->inode_lock[DIRTY_META]);
   1128		if (list_empty(head)) {
   1129			spin_unlock(&sbi->inode_lock[DIRTY_META]);
   1130			return 0;
   1131		}
   1132		fi = list_first_entry(head, struct f2fs_inode_info,
   1133							gdirty_list);
   1134		inode = igrab(&fi->vfs_inode);
   1135		spin_unlock(&sbi->inode_lock[DIRTY_META]);
   1136		if (inode) {
   1137			sync_inode_metadata(inode, 0);
   1138
   1139			/* it's on eviction */
   1140			if (is_inode_flag_set(inode, FI_DIRTY_INODE))
   1141				f2fs_update_inode_page(inode);
   1142			iput(inode);
   1143		}
   1144	}
   1145	return 0;
   1146}
   1147
   1148static void __prepare_cp_block(struct f2fs_sb_info *sbi)
   1149{
   1150	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
   1151	struct f2fs_nm_info *nm_i = NM_I(sbi);
   1152	nid_t last_nid = nm_i->next_scan_nid;
   1153
   1154	next_free_nid(sbi, &last_nid);
   1155	ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
   1156	ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
   1157	ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
   1158	ckpt->next_free_nid = cpu_to_le32(last_nid);
   1159}
   1160
   1161static bool __need_flush_quota(struct f2fs_sb_info *sbi)
   1162{
   1163	bool ret = false;
   1164
   1165	if (!is_journalled_quota(sbi))
   1166		return false;
   1167
   1168	if (!f2fs_down_write_trylock(&sbi->quota_sem))
   1169		return true;
   1170	if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) {
   1171		ret = false;
   1172	} else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR)) {
   1173		ret = false;
   1174	} else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH)) {
   1175		clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
   1176		ret = true;
   1177	} else if (get_pages(sbi, F2FS_DIRTY_QDATA)) {
   1178		ret = true;
   1179	}
   1180	f2fs_up_write(&sbi->quota_sem);
   1181	return ret;
   1182}
   1183
   1184/*
   1185 * Freeze all the FS-operations for checkpoint.
   1186 */
   1187static int block_operations(struct f2fs_sb_info *sbi)
   1188{
   1189	struct writeback_control wbc = {
   1190		.sync_mode = WB_SYNC_ALL,
   1191		.nr_to_write = LONG_MAX,
   1192		.for_reclaim = 0,
   1193	};
   1194	int err = 0, cnt = 0;
   1195
   1196	/*
   1197	 * Let's flush inline_data in dirty node pages.
   1198	 */
   1199	f2fs_flush_inline_data(sbi);
   1200
   1201retry_flush_quotas:
   1202	f2fs_lock_all(sbi);
   1203	if (__need_flush_quota(sbi)) {
   1204		int locked;
   1205
   1206		if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) {
   1207			set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
   1208			set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
   1209			goto retry_flush_dents;
   1210		}
   1211		f2fs_unlock_all(sbi);
   1212
   1213		/* only failed during mount/umount/freeze/quotactl */
   1214		locked = down_read_trylock(&sbi->sb->s_umount);
   1215		f2fs_quota_sync(sbi->sb, -1);
   1216		if (locked)
   1217			up_read(&sbi->sb->s_umount);
   1218		cond_resched();
   1219		goto retry_flush_quotas;
   1220	}
   1221
   1222retry_flush_dents:
   1223	/* write all the dirty dentry pages */
   1224	if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
   1225		f2fs_unlock_all(sbi);
   1226		err = f2fs_sync_dirty_inodes(sbi, DIR_INODE);
   1227		if (err)
   1228			return err;
   1229		cond_resched();
   1230		goto retry_flush_quotas;
   1231	}
   1232
   1233	/*
   1234	 * POR: we should ensure that there are no dirty node pages
   1235	 * until finishing nat/sit flush. inode->i_blocks can be updated.
   1236	 */
   1237	f2fs_down_write(&sbi->node_change);
   1238
   1239	if (get_pages(sbi, F2FS_DIRTY_IMETA)) {
   1240		f2fs_up_write(&sbi->node_change);
   1241		f2fs_unlock_all(sbi);
   1242		err = f2fs_sync_inode_meta(sbi);
   1243		if (err)
   1244			return err;
   1245		cond_resched();
   1246		goto retry_flush_quotas;
   1247	}
   1248
   1249retry_flush_nodes:
   1250	f2fs_down_write(&sbi->node_write);
   1251
   1252	if (get_pages(sbi, F2FS_DIRTY_NODES)) {
   1253		f2fs_up_write(&sbi->node_write);
   1254		atomic_inc(&sbi->wb_sync_req[NODE]);
   1255		err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO);
   1256		atomic_dec(&sbi->wb_sync_req[NODE]);
   1257		if (err) {
   1258			f2fs_up_write(&sbi->node_change);
   1259			f2fs_unlock_all(sbi);
   1260			return err;
   1261		}
   1262		cond_resched();
   1263		goto retry_flush_nodes;
   1264	}
   1265
   1266	/*
   1267	 * sbi->node_change is used only for AIO write_begin path which produces
   1268	 * dirty node blocks and some checkpoint values by block allocation.
   1269	 */
   1270	__prepare_cp_block(sbi);
   1271	f2fs_up_write(&sbi->node_change);
   1272	return err;
   1273}
   1274
   1275static void unblock_operations(struct f2fs_sb_info *sbi)
   1276{
   1277	f2fs_up_write(&sbi->node_write);
   1278	f2fs_unlock_all(sbi);
   1279}
   1280
   1281void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
   1282{
   1283	DEFINE_WAIT(wait);
   1284
   1285	for (;;) {
   1286		if (!get_pages(sbi, type))
   1287			break;
   1288
   1289		if (unlikely(f2fs_cp_error(sbi)))
   1290			break;
   1291
   1292		if (type == F2FS_DIRTY_META)
   1293			f2fs_sync_meta_pages(sbi, META, LONG_MAX,
   1294							FS_CP_META_IO);
   1295		else if (type == F2FS_WB_CP_DATA)
   1296			f2fs_submit_merged_write(sbi, DATA);
   1297
   1298		prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
   1299		io_schedule_timeout(DEFAULT_IO_TIMEOUT);
   1300	}
   1301	finish_wait(&sbi->cp_wait, &wait);
   1302}
   1303
   1304static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
   1305{
   1306	unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
   1307	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
   1308	unsigned long flags;
   1309
   1310	if (cpc->reason & CP_UMOUNT) {
   1311		if (le32_to_cpu(ckpt->cp_pack_total_block_count) +
   1312			NM_I(sbi)->nat_bits_blocks > sbi->blocks_per_seg) {
   1313			clear_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
   1314			f2fs_notice(sbi, "Disable nat_bits due to no space");
   1315		} else if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG) &&
   1316						f2fs_nat_bitmap_enabled(sbi)) {
   1317			f2fs_enable_nat_bits(sbi);
   1318			set_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
   1319			f2fs_notice(sbi, "Rebuild and enable nat_bits");
   1320		}
   1321	}
   1322
   1323	spin_lock_irqsave(&sbi->cp_lock, flags);
   1324
   1325	if (cpc->reason & CP_TRIMMED)
   1326		__set_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
   1327	else
   1328		__clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG);
   1329
   1330	if (cpc->reason & CP_UMOUNT)
   1331		__set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
   1332	else
   1333		__clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
   1334
   1335	if (cpc->reason & CP_FASTBOOT)
   1336		__set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
   1337	else
   1338		__clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG);
   1339
   1340	if (orphan_num)
   1341		__set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
   1342	else
   1343		__clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
   1344
   1345	if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
   1346		__set_ckpt_flags(ckpt, CP_FSCK_FLAG);
   1347
   1348	if (is_sbi_flag_set(sbi, SBI_IS_RESIZEFS))
   1349		__set_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
   1350	else
   1351		__clear_ckpt_flags(ckpt, CP_RESIZEFS_FLAG);
   1352
   1353	if (is_sbi_flag_set(sbi, SBI_CP_DISABLED))
   1354		__set_ckpt_flags(ckpt, CP_DISABLED_FLAG);
   1355	else
   1356		__clear_ckpt_flags(ckpt, CP_DISABLED_FLAG);
   1357
   1358	if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK))
   1359		__set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
   1360	else
   1361		__clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
   1362
   1363	if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
   1364		__set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
   1365	else
   1366		__clear_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
   1367
   1368	if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR))
   1369		__set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
   1370
   1371	/* set this flag to activate crc|cp_ver for recovery */
   1372	__set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
   1373	__clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG);
   1374
   1375	spin_unlock_irqrestore(&sbi->cp_lock, flags);
   1376}
   1377
   1378static void commit_checkpoint(struct f2fs_sb_info *sbi,
   1379	void *src, block_t blk_addr)
   1380{
   1381	struct writeback_control wbc = {
   1382		.for_reclaim = 0,
   1383	};
   1384
   1385	/*
   1386	 * pagevec_lookup_tag and lock_page again will take
   1387	 * some extra time. Therefore, f2fs_update_meta_pages and
   1388	 * f2fs_sync_meta_pages are combined in this function.
   1389	 */
   1390	struct page *page = f2fs_grab_meta_page(sbi, blk_addr);
   1391	int err;
   1392
   1393	f2fs_wait_on_page_writeback(page, META, true, true);
   1394
   1395	memcpy(page_address(page), src, PAGE_SIZE);
   1396
   1397	set_page_dirty(page);
   1398	if (unlikely(!clear_page_dirty_for_io(page)))
   1399		f2fs_bug_on(sbi, 1);
   1400
   1401	/* writeout cp pack 2 page */
   1402	err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
   1403	if (unlikely(err && f2fs_cp_error(sbi))) {
   1404		f2fs_put_page(page, 1);
   1405		return;
   1406	}
   1407
   1408	f2fs_bug_on(sbi, err);
   1409	f2fs_put_page(page, 0);
   1410
   1411	/* submit checkpoint (with barrier if NOBARRIER is not set) */
   1412	f2fs_submit_merged_write(sbi, META_FLUSH);
   1413}
   1414
   1415static inline u64 get_sectors_written(struct block_device *bdev)
   1416{
   1417	return (u64)part_stat_read(bdev, sectors[STAT_WRITE]);
   1418}
   1419
   1420u64 f2fs_get_sectors_written(struct f2fs_sb_info *sbi)
   1421{
   1422	if (f2fs_is_multi_device(sbi)) {
   1423		u64 sectors = 0;
   1424		int i;
   1425
   1426		for (i = 0; i < sbi->s_ndevs; i++)
   1427			sectors += get_sectors_written(FDEV(i).bdev);
   1428
   1429		return sectors;
   1430	}
   1431
   1432	return get_sectors_written(sbi->sb->s_bdev);
   1433}
   1434
   1435static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
   1436{
   1437	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
   1438	struct f2fs_nm_info *nm_i = NM_I(sbi);
   1439	unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
   1440	block_t start_blk;
   1441	unsigned int data_sum_blocks, orphan_blocks;
   1442	__u32 crc32 = 0;
   1443	int i;
   1444	int cp_payload_blks = __cp_payload(sbi);
   1445	struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
   1446	u64 kbytes_written;
   1447	int err;
   1448
   1449	/* Flush all the NAT/SIT pages */
   1450	f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
   1451
   1452	/* start to update checkpoint, cp ver is already updated previously */
   1453	ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true));
   1454	ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
   1455	for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
   1456		ckpt->cur_node_segno[i] =
   1457			cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
   1458		ckpt->cur_node_blkoff[i] =
   1459			cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
   1460		ckpt->alloc_type[i + CURSEG_HOT_NODE] =
   1461				curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
   1462	}
   1463	for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
   1464		ckpt->cur_data_segno[i] =
   1465			cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
   1466		ckpt->cur_data_blkoff[i] =
   1467			cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
   1468		ckpt->alloc_type[i + CURSEG_HOT_DATA] =
   1469				curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
   1470	}
   1471
   1472	/* 2 cp + n data seg summary + orphan inode blocks */
   1473	data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false);
   1474	spin_lock_irqsave(&sbi->cp_lock, flags);
   1475	if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
   1476		__set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
   1477	else
   1478		__clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
   1479	spin_unlock_irqrestore(&sbi->cp_lock, flags);
   1480
   1481	orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
   1482	ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
   1483			orphan_blocks);
   1484
   1485	if (__remain_node_summaries(cpc->reason))
   1486		ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
   1487				cp_payload_blks + data_sum_blocks +
   1488				orphan_blocks + NR_CURSEG_NODE_TYPE);
   1489	else
   1490		ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS +
   1491				cp_payload_blks + data_sum_blocks +
   1492				orphan_blocks);
   1493
   1494	/* update ckpt flag for checkpoint */
   1495	update_ckpt_flags(sbi, cpc);
   1496
   1497	/* update SIT/NAT bitmap */
   1498	get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
   1499	get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
   1500
   1501	crc32 = f2fs_checkpoint_chksum(sbi, ckpt);
   1502	*((__le32 *)((unsigned char *)ckpt +
   1503				le32_to_cpu(ckpt->checksum_offset)))
   1504				= cpu_to_le32(crc32);
   1505
   1506	start_blk = __start_cp_next_addr(sbi);
   1507
   1508	/* write nat bits */
   1509	if ((cpc->reason & CP_UMOUNT) &&
   1510			is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG)) {
   1511		__u64 cp_ver = cur_cp_version(ckpt);
   1512		block_t blk;
   1513
   1514		cp_ver |= ((__u64)crc32 << 32);
   1515		*(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver);
   1516
   1517		blk = start_blk + sbi->blocks_per_seg - nm_i->nat_bits_blocks;
   1518		for (i = 0; i < nm_i->nat_bits_blocks; i++)
   1519			f2fs_update_meta_page(sbi, nm_i->nat_bits +
   1520					(i << F2FS_BLKSIZE_BITS), blk + i);
   1521	}
   1522
   1523	/* write out checkpoint buffer at block 0 */
   1524	f2fs_update_meta_page(sbi, ckpt, start_blk++);
   1525
   1526	for (i = 1; i < 1 + cp_payload_blks; i++)
   1527		f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE,
   1528							start_blk++);
   1529
   1530	if (orphan_num) {
   1531		write_orphan_inodes(sbi, start_blk);
   1532		start_blk += orphan_blocks;
   1533	}
   1534
   1535	f2fs_write_data_summaries(sbi, start_blk);
   1536	start_blk += data_sum_blocks;
   1537
   1538	/* Record write statistics in the hot node summary */
   1539	kbytes_written = sbi->kbytes_written;
   1540	kbytes_written += (f2fs_get_sectors_written(sbi) -
   1541				sbi->sectors_written_start) >> 1;
   1542	seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written);
   1543
   1544	if (__remain_node_summaries(cpc->reason)) {
   1545		f2fs_write_node_summaries(sbi, start_blk);
   1546		start_blk += NR_CURSEG_NODE_TYPE;
   1547	}
   1548
   1549	/* update user_block_counts */
   1550	sbi->last_valid_block_count = sbi->total_valid_block_count;
   1551	percpu_counter_set(&sbi->alloc_valid_block_count, 0);
   1552	percpu_counter_set(&sbi->rf_node_block_count, 0);
   1553
   1554	/* Here, we have one bio having CP pack except cp pack 2 page */
   1555	f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
   1556	/* Wait for all dirty meta pages to be submitted for IO */
   1557	f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META);
   1558
   1559	/* wait for previous submitted meta pages writeback */
   1560	f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
   1561
   1562	/* flush all device cache */
   1563	err = f2fs_flush_device_cache(sbi);
   1564	if (err)
   1565		return err;
   1566
   1567	/* barrier and flush checkpoint cp pack 2 page if it can */
   1568	commit_checkpoint(sbi, ckpt, start_blk);
   1569	f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
   1570
   1571	/*
   1572	 * invalidate intermediate page cache borrowed from meta inode which are
   1573	 * used for migration of encrypted, verity or compressed inode's blocks.
   1574	 */
   1575	if (f2fs_sb_has_encrypt(sbi) || f2fs_sb_has_verity(sbi) ||
   1576		f2fs_sb_has_compression(sbi))
   1577		invalidate_mapping_pages(META_MAPPING(sbi),
   1578				MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1);
   1579
   1580	f2fs_release_ino_entry(sbi, false);
   1581
   1582	f2fs_reset_fsync_node_info(sbi);
   1583
   1584	clear_sbi_flag(sbi, SBI_IS_DIRTY);
   1585	clear_sbi_flag(sbi, SBI_NEED_CP);
   1586	clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
   1587
   1588	spin_lock(&sbi->stat_lock);
   1589	sbi->unusable_block_count = 0;
   1590	spin_unlock(&sbi->stat_lock);
   1591
   1592	__set_cp_next_pack(sbi);
   1593
   1594	/*
   1595	 * redirty superblock if metadata like node page or inode cache is
   1596	 * updated during writing checkpoint.
   1597	 */
   1598	if (get_pages(sbi, F2FS_DIRTY_NODES) ||
   1599			get_pages(sbi, F2FS_DIRTY_IMETA))
   1600		set_sbi_flag(sbi, SBI_IS_DIRTY);
   1601
   1602	f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
   1603
   1604	return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
   1605}
   1606
   1607int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
   1608{
   1609	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
   1610	unsigned long long ckpt_ver;
   1611	int err = 0;
   1612
   1613	if (f2fs_readonly(sbi->sb) || f2fs_hw_is_readonly(sbi))
   1614		return -EROFS;
   1615
   1616	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
   1617		if (cpc->reason != CP_PAUSE)
   1618			return 0;
   1619		f2fs_warn(sbi, "Start checkpoint disabled!");
   1620	}
   1621	if (cpc->reason != CP_RESIZE)
   1622		f2fs_down_write(&sbi->cp_global_sem);
   1623
   1624	if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
   1625		((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
   1626		((cpc->reason & CP_DISCARD) && !sbi->discard_blks)))
   1627		goto out;
   1628	if (unlikely(f2fs_cp_error(sbi))) {
   1629		err = -EIO;
   1630		goto out;
   1631	}
   1632
   1633	trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "start block_ops");
   1634
   1635	err = block_operations(sbi);
   1636	if (err)
   1637		goto out;
   1638
   1639	trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish block_ops");
   1640
   1641	f2fs_flush_merged_writes(sbi);
   1642
   1643	/* this is the case of multiple fstrims without any changes */
   1644	if (cpc->reason & CP_DISCARD) {
   1645		if (!f2fs_exist_trim_candidates(sbi, cpc)) {
   1646			unblock_operations(sbi);
   1647			goto out;
   1648		}
   1649
   1650		if (NM_I(sbi)->nat_cnt[DIRTY_NAT] == 0 &&
   1651				SIT_I(sbi)->dirty_sentries == 0 &&
   1652				prefree_segments(sbi) == 0) {
   1653			f2fs_flush_sit_entries(sbi, cpc);
   1654			f2fs_clear_prefree_segments(sbi, cpc);
   1655			unblock_operations(sbi);
   1656			goto out;
   1657		}
   1658	}
   1659
   1660	/*
   1661	 * update checkpoint pack index
   1662	 * Increase the version number so that
   1663	 * SIT entries and seg summaries are written at correct place
   1664	 */
   1665	ckpt_ver = cur_cp_version(ckpt);
   1666	ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
   1667
   1668	/* write cached NAT/SIT entries to NAT/SIT area */
   1669	err = f2fs_flush_nat_entries(sbi, cpc);
   1670	if (err) {
   1671		f2fs_err(sbi, "f2fs_flush_nat_entries failed err:%d, stop checkpoint", err);
   1672		f2fs_bug_on(sbi, !f2fs_cp_error(sbi));
   1673		goto stop;
   1674	}
   1675
   1676	f2fs_flush_sit_entries(sbi, cpc);
   1677
   1678	/* save inmem log status */
   1679	f2fs_save_inmem_curseg(sbi);
   1680
   1681	err = do_checkpoint(sbi, cpc);
   1682	if (err) {
   1683		f2fs_err(sbi, "do_checkpoint failed err:%d, stop checkpoint", err);
   1684		f2fs_bug_on(sbi, !f2fs_cp_error(sbi));
   1685		f2fs_release_discard_addrs(sbi);
   1686	} else {
   1687		f2fs_clear_prefree_segments(sbi, cpc);
   1688	}
   1689
   1690	f2fs_restore_inmem_curseg(sbi);
   1691stop:
   1692	unblock_operations(sbi);
   1693	stat_inc_cp_count(sbi->stat_info);
   1694
   1695	if (cpc->reason & CP_RECOVERY)
   1696		f2fs_notice(sbi, "checkpoint: version = %llx", ckpt_ver);
   1697
   1698	/* update CP_TIME to trigger checkpoint periodically */
   1699	f2fs_update_time(sbi, CP_TIME);
   1700	trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
   1701out:
   1702	if (cpc->reason != CP_RESIZE)
   1703		f2fs_up_write(&sbi->cp_global_sem);
   1704	return err;
   1705}
   1706
   1707void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
   1708{
   1709	int i;
   1710
   1711	for (i = 0; i < MAX_INO_ENTRY; i++) {
   1712		struct inode_management *im = &sbi->im[i];
   1713
   1714		INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC);
   1715		spin_lock_init(&im->ino_lock);
   1716		INIT_LIST_HEAD(&im->ino_list);
   1717		im->ino_num = 0;
   1718	}
   1719
   1720	sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
   1721			NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
   1722				F2FS_ORPHANS_PER_BLOCK;
   1723}
   1724
   1725int __init f2fs_create_checkpoint_caches(void)
   1726{
   1727	ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry",
   1728			sizeof(struct ino_entry));
   1729	if (!ino_entry_slab)
   1730		return -ENOMEM;
   1731	f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry",
   1732			sizeof(struct inode_entry));
   1733	if (!f2fs_inode_entry_slab) {
   1734		kmem_cache_destroy(ino_entry_slab);
   1735		return -ENOMEM;
   1736	}
   1737	return 0;
   1738}
   1739
   1740void f2fs_destroy_checkpoint_caches(void)
   1741{
   1742	kmem_cache_destroy(ino_entry_slab);
   1743	kmem_cache_destroy(f2fs_inode_entry_slab);
   1744}
   1745
   1746static int __write_checkpoint_sync(struct f2fs_sb_info *sbi)
   1747{
   1748	struct cp_control cpc = { .reason = CP_SYNC, };
   1749	int err;
   1750
   1751	f2fs_down_write(&sbi->gc_lock);
   1752	err = f2fs_write_checkpoint(sbi, &cpc);
   1753	f2fs_up_write(&sbi->gc_lock);
   1754
   1755	return err;
   1756}
   1757
   1758static void __checkpoint_and_complete_reqs(struct f2fs_sb_info *sbi)
   1759{
   1760	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1761	struct ckpt_req *req, *next;
   1762	struct llist_node *dispatch_list;
   1763	u64 sum_diff = 0, diff, count = 0;
   1764	int ret;
   1765
   1766	dispatch_list = llist_del_all(&cprc->issue_list);
   1767	if (!dispatch_list)
   1768		return;
   1769	dispatch_list = llist_reverse_order(dispatch_list);
   1770
   1771	ret = __write_checkpoint_sync(sbi);
   1772	atomic_inc(&cprc->issued_ckpt);
   1773
   1774	llist_for_each_entry_safe(req, next, dispatch_list, llnode) {
   1775		diff = (u64)ktime_ms_delta(ktime_get(), req->queue_time);
   1776		req->ret = ret;
   1777		complete(&req->wait);
   1778
   1779		sum_diff += diff;
   1780		count++;
   1781	}
   1782	atomic_sub(count, &cprc->queued_ckpt);
   1783	atomic_add(count, &cprc->total_ckpt);
   1784
   1785	spin_lock(&cprc->stat_lock);
   1786	cprc->cur_time = (unsigned int)div64_u64(sum_diff, count);
   1787	if (cprc->peak_time < cprc->cur_time)
   1788		cprc->peak_time = cprc->cur_time;
   1789	spin_unlock(&cprc->stat_lock);
   1790}
   1791
   1792static int issue_checkpoint_thread(void *data)
   1793{
   1794	struct f2fs_sb_info *sbi = data;
   1795	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1796	wait_queue_head_t *q = &cprc->ckpt_wait_queue;
   1797repeat:
   1798	if (kthread_should_stop())
   1799		return 0;
   1800
   1801	if (!llist_empty(&cprc->issue_list))
   1802		__checkpoint_and_complete_reqs(sbi);
   1803
   1804	wait_event_interruptible(*q,
   1805		kthread_should_stop() || !llist_empty(&cprc->issue_list));
   1806	goto repeat;
   1807}
   1808
   1809static void flush_remained_ckpt_reqs(struct f2fs_sb_info *sbi,
   1810		struct ckpt_req *wait_req)
   1811{
   1812	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1813
   1814	if (!llist_empty(&cprc->issue_list)) {
   1815		__checkpoint_and_complete_reqs(sbi);
   1816	} else {
   1817		/* already dispatched by issue_checkpoint_thread */
   1818		if (wait_req)
   1819			wait_for_completion(&wait_req->wait);
   1820	}
   1821}
   1822
   1823static void init_ckpt_req(struct ckpt_req *req)
   1824{
   1825	memset(req, 0, sizeof(struct ckpt_req));
   1826
   1827	init_completion(&req->wait);
   1828	req->queue_time = ktime_get();
   1829}
   1830
   1831int f2fs_issue_checkpoint(struct f2fs_sb_info *sbi)
   1832{
   1833	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1834	struct ckpt_req req;
   1835	struct cp_control cpc;
   1836
   1837	cpc.reason = __get_cp_reason(sbi);
   1838	if (!test_opt(sbi, MERGE_CHECKPOINT) || cpc.reason != CP_SYNC) {
   1839		int ret;
   1840
   1841		f2fs_down_write(&sbi->gc_lock);
   1842		ret = f2fs_write_checkpoint(sbi, &cpc);
   1843		f2fs_up_write(&sbi->gc_lock);
   1844
   1845		return ret;
   1846	}
   1847
   1848	if (!cprc->f2fs_issue_ckpt)
   1849		return __write_checkpoint_sync(sbi);
   1850
   1851	init_ckpt_req(&req);
   1852
   1853	llist_add(&req.llnode, &cprc->issue_list);
   1854	atomic_inc(&cprc->queued_ckpt);
   1855
   1856	/*
   1857	 * update issue_list before we wake up issue_checkpoint thread,
   1858	 * this smp_mb() pairs with another barrier in ___wait_event(),
   1859	 * see more details in comments of waitqueue_active().
   1860	 */
   1861	smp_mb();
   1862
   1863	if (waitqueue_active(&cprc->ckpt_wait_queue))
   1864		wake_up(&cprc->ckpt_wait_queue);
   1865
   1866	if (cprc->f2fs_issue_ckpt)
   1867		wait_for_completion(&req.wait);
   1868	else
   1869		flush_remained_ckpt_reqs(sbi, &req);
   1870
   1871	return req.ret;
   1872}
   1873
   1874int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi)
   1875{
   1876	dev_t dev = sbi->sb->s_bdev->bd_dev;
   1877	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1878
   1879	if (cprc->f2fs_issue_ckpt)
   1880		return 0;
   1881
   1882	cprc->f2fs_issue_ckpt = kthread_run(issue_checkpoint_thread, sbi,
   1883			"f2fs_ckpt-%u:%u", MAJOR(dev), MINOR(dev));
   1884	if (IS_ERR(cprc->f2fs_issue_ckpt)) {
   1885		cprc->f2fs_issue_ckpt = NULL;
   1886		return -ENOMEM;
   1887	}
   1888
   1889	set_task_ioprio(cprc->f2fs_issue_ckpt, cprc->ckpt_thread_ioprio);
   1890
   1891	return 0;
   1892}
   1893
   1894void f2fs_stop_ckpt_thread(struct f2fs_sb_info *sbi)
   1895{
   1896	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1897
   1898	if (cprc->f2fs_issue_ckpt) {
   1899		struct task_struct *ckpt_task = cprc->f2fs_issue_ckpt;
   1900
   1901		cprc->f2fs_issue_ckpt = NULL;
   1902		kthread_stop(ckpt_task);
   1903
   1904		flush_remained_ckpt_reqs(sbi, NULL);
   1905	}
   1906}
   1907
   1908void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi)
   1909{
   1910	struct ckpt_req_control *cprc = &sbi->cprc_info;
   1911
   1912	atomic_set(&cprc->issued_ckpt, 0);
   1913	atomic_set(&cprc->total_ckpt, 0);
   1914	atomic_set(&cprc->queued_ckpt, 0);
   1915	cprc->ckpt_thread_ioprio = DEFAULT_CHECKPOINT_IOPRIO;
   1916	init_waitqueue_head(&cprc->ckpt_wait_queue);
   1917	init_llist_head(&cprc->issue_list);
   1918	spin_lock_init(&cprc->stat_lock);
   1919}