diff options
Diffstat (limited to 'fs/f2fs/checkpoint.c')
| -rw-r--r-- | fs/f2fs/checkpoint.c | 2306 |
1 files changed, 2306 insertions, 0 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c new file mode 100644 index 000000000..4b59f30ef --- /dev/null +++ b/fs/f2fs/checkpoint.c @@ -0,0 +1,2306 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fs/f2fs/checkpoint.c + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + */ +#include <linux/fs.h> +#include <linux/bio.h> +#include <linux/mpage.h> +#include <linux/writeback.h> +#include <linux/blkdev.h> +#include <linux/f2fs_fs.h> +#include <linux/folio_batch.h> +#include <linux/swap.h> +#include <linux/kthread.h> +#include <linux/delayacct.h> +#include <linux/ioprio.h> +#include <linux/math64.h> + +#include "f2fs.h" +#include "node.h" +#include "segment.h" +#include "iostat.h" +#include <trace/events/f2fs.h> + +static inline void get_lock_elapsed_time(struct f2fs_time_stat *ts) +{ + ts->total_time = ktime_get(); +#ifdef CONFIG_64BIT + ts->running_time = current->se.sum_exec_runtime; +#endif +#if defined(CONFIG_SCHED_INFO) && defined(CONFIG_SCHEDSTATS) + ts->runnable_time = current->sched_info.run_delay; +#endif +#ifdef CONFIG_TASK_DELAY_ACCT + if (current->delays) + ts->io_sleep_time = current->delays->blkio_delay; +#endif +} + +static inline void trace_lock_elapsed_time_start(struct f2fs_rwsem *sem, + struct f2fs_lock_context *lc) +{ + lc->lock_trace = trace_f2fs_lock_elapsed_time_enabled(); + if (!lc->lock_trace) + return; + + get_lock_elapsed_time(&lc->ts); +} + +static inline void trace_lock_elapsed_time_end(struct f2fs_rwsem *sem, + struct f2fs_lock_context *lc, bool is_write) +{ + struct f2fs_time_stat tts; + unsigned long long total_time; + unsigned long long running_time = 0; + unsigned long long runnable_time = 0; + unsigned long long io_sleep_time = 0; + unsigned long long other_time = 0; + unsigned npm = NSEC_PER_MSEC; + + if (!lc->lock_trace) + return; + + if (time_to_inject(sem->sbi, FAULT_LOCK_TIMEOUT)) + f2fs_schedule_timeout_killable(DEFAULT_FAULT_TIMEOUT, true); + + get_lock_elapsed_time(&tts); + + total_time = div_u64(tts.total_time - lc->ts.total_time, npm); + if (total_time <= sem->sbi->max_lock_elapsed_time) + return; + +#ifdef CONFIG_64BIT + running_time = div_u64(tts.running_time - lc->ts.running_time, npm); +#endif +#if defined(CONFIG_SCHED_INFO) && defined(CONFIG_SCHEDSTATS) + runnable_time = div_u64(tts.runnable_time - lc->ts.runnable_time, npm); +#endif +#ifdef CONFIG_TASK_DELAY_ACCT + io_sleep_time = div_u64(tts.io_sleep_time - lc->ts.io_sleep_time, npm); +#endif + if (total_time > running_time + io_sleep_time + runnable_time) + other_time = total_time - running_time - + io_sleep_time - runnable_time; + + trace_f2fs_lock_elapsed_time(sem->sbi, sem->name, is_write, current, + get_current_ioprio(), total_time, running_time, + runnable_time, io_sleep_time, other_time); +} + +static bool need_uplift_priority(struct f2fs_rwsem *sem, bool is_write) +{ + if (!(sem->sbi->adjust_lock_priority & BIT(sem->name - 1))) + return false; + + switch (sem->name) { + /* + * writer is checkpoint which has high priority, let's just uplift + * priority for reader + */ + case LOCK_NAME_CP_RWSEM: + case LOCK_NAME_NODE_CHANGE: + case LOCK_NAME_NODE_WRITE: + return !is_write; + case LOCK_NAME_GC_LOCK: + case LOCK_NAME_CP_GLOBAL: + case LOCK_NAME_IO_RWSEM: + case LOCK_NAME_NAT_TREE_LOCK: + return true; + default: + f2fs_bug_on(sem->sbi, 1); + } + return false; +} + +static void uplift_priority(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc, + bool is_write) +{ + lc->need_restore = false; + if (!sem->sbi->adjust_lock_priority) + return; + if (rt_task(current)) + return; + if (!need_uplift_priority(sem, is_write)) + return; + lc->orig_nice = task_nice(current); + lc->new_nice = PRIO_TO_NICE(sem->sbi->lock_duration_priority); + if (lc->orig_nice <= lc->new_nice) + return; + set_user_nice(current, lc->new_nice); + lc->need_restore = true; + + trace_f2fs_priority_uplift(sem->sbi, sem->name, is_write, current, + NICE_TO_PRIO(lc->orig_nice), NICE_TO_PRIO(lc->new_nice)); +} + +static void restore_priority(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc, + bool is_write) +{ + if (!lc->need_restore) + return; + /* someone has updated the priority */ + if (task_nice(current) != lc->new_nice) + return; + set_user_nice(current, lc->orig_nice); + + trace_f2fs_priority_restore(sem->sbi, sem->name, is_write, current, + NICE_TO_PRIO(lc->orig_nice), NICE_TO_PRIO(lc->new_nice)); +} + +void f2fs_down_read_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + uplift_priority(sem, lc, false); + f2fs_down_read(sem); + trace_lock_elapsed_time_start(sem, lc); +} + +int f2fs_down_read_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + uplift_priority(sem, lc, false); + if (!f2fs_down_read_trylock(sem)) { + restore_priority(sem, lc, false); + return 0; + } + trace_lock_elapsed_time_start(sem, lc); + return 1; +} + +void f2fs_up_read_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + f2fs_up_read(sem); + restore_priority(sem, lc, false); + trace_lock_elapsed_time_end(sem, lc, false); +} + +void f2fs_down_write_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + uplift_priority(sem, lc, true); + f2fs_down_write(sem); + trace_lock_elapsed_time_start(sem, lc); +} + +int f2fs_down_write_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + uplift_priority(sem, lc, true); + if (!f2fs_down_write_trylock(sem)) { + restore_priority(sem, lc, true); + return 0; + } + trace_lock_elapsed_time_start(sem, lc); + return 1; +} + +void f2fs_up_write_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc) +{ + f2fs_up_write(sem); + restore_priority(sem, lc, true); + trace_lock_elapsed_time_end(sem, lc, true); +} + +void f2fs_lock_op(struct f2fs_sb_info *sbi, struct f2fs_lock_context *lc) +{ + f2fs_down_read_trace(&sbi->cp_rwsem, lc); +} + +int f2fs_trylock_op(struct f2fs_sb_info *sbi, struct f2fs_lock_context *lc) +{ + if (time_to_inject(sbi, FAULT_LOCK_OP)) + return 0; + + return f2fs_down_read_trylock_trace(&sbi->cp_rwsem, lc); +} + +void f2fs_unlock_op(struct f2fs_sb_info *sbi, struct f2fs_lock_context *lc) +{ + f2fs_up_read_trace(&sbi->cp_rwsem, lc); +} + +static inline void f2fs_lock_all(struct f2fs_sb_info *sbi) +{ + f2fs_down_write(&sbi->cp_rwsem); +} + +static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi) +{ + f2fs_up_write(&sbi->cp_rwsem); +} + +#define DEFAULT_CHECKPOINT_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 3)) + +static struct kmem_cache *ino_entry_slab; +struct kmem_cache *f2fs_inode_entry_slab; + +/* + * We guarantee no failure on the returned page. + */ +struct folio *f2fs_grab_meta_folio(struct f2fs_sb_info *sbi, pgoff_t index) +{ + struct address_space *mapping = META_MAPPING(sbi); + struct folio *folio; +repeat: + folio = f2fs_grab_cache_folio(mapping, index, false); + if (IS_ERR(folio)) { + cond_resched(); + goto repeat; + } + f2fs_folio_wait_writeback(folio, META, true, true); + if (!folio_test_uptodate(folio)) + folio_mark_uptodate(folio); + return folio; +} + +static struct folio *__get_meta_folio(struct f2fs_sb_info *sbi, pgoff_t index, + bool is_meta) +{ + struct address_space *mapping = META_MAPPING(sbi); + struct folio *folio; + struct f2fs_io_info fio = { + .sbi = sbi, + .type = META, + .op = REQ_OP_READ, + .op_flags = REQ_META | REQ_PRIO, + .old_blkaddr = index, + .new_blkaddr = index, + .encrypted_page = NULL, + .is_por = !is_meta ? 1 : 0, + }; + int err; + + if (unlikely(!is_meta)) + fio.op_flags &= ~REQ_META; +repeat: + folio = f2fs_grab_cache_folio(mapping, index, false); + if (IS_ERR(folio)) { + cond_resched(); + goto repeat; + } + if (folio_test_uptodate(folio)) + goto out; + + fio.folio = folio; + + err = f2fs_submit_page_bio(&fio); + if (err) { + f2fs_folio_put(folio, true); + return ERR_PTR(err); + } + + f2fs_update_iostat(sbi, NULL, FS_META_READ_IO, F2FS_BLKSIZE); + + folio_lock(folio); + if (unlikely(!is_meta_folio(folio))) { + f2fs_folio_put(folio, true); + goto repeat; + } + + if (unlikely(!folio_test_uptodate(folio))) { + f2fs_handle_page_eio(sbi, folio, META); + f2fs_folio_put(folio, true); + return ERR_PTR(-EIO); + } +out: + return folio; +} + +struct folio *f2fs_get_meta_folio(struct f2fs_sb_info *sbi, pgoff_t index) +{ + return __get_meta_folio(sbi, index, true); +} + +struct folio *f2fs_get_meta_folio_retry(struct f2fs_sb_info *sbi, pgoff_t index) +{ + struct folio *folio; + int count = 0; + +retry: + folio = __get_meta_folio(sbi, index, true); + if (IS_ERR(folio)) { + if (PTR_ERR(folio) == -EIO && + ++count <= DEFAULT_RETRY_IO_COUNT) + goto retry; + f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_META_PAGE); + } + return folio; +} + +/* for POR only */ +struct folio *f2fs_get_tmp_folio(struct f2fs_sb_info *sbi, pgoff_t index) +{ + return __get_meta_folio(sbi, index, false); +} + +static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr, + int type) +{ + struct seg_entry *se; + unsigned int segno, offset; + bool exist; + + if (type == DATA_GENERIC) + return true; + + segno = GET_SEGNO(sbi, blkaddr); + offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); + se = get_seg_entry(sbi, segno); + + exist = f2fs_test_bit(offset, se->cur_valid_map); + + /* skip data, if we already have an error in checkpoint. */ + if (unlikely(f2fs_cp_error(sbi))) + return exist; + + if ((exist && type == DATA_GENERIC_ENHANCE_UPDATE) || + (!exist && type == DATA_GENERIC_ENHANCE)) + goto out_err; + if (!exist && type != DATA_GENERIC_ENHANCE_UPDATE) + goto out_handle; + return exist; + +out_err: + f2fs_err(sbi, "Inconsistent error blkaddr:%u, sit bitmap:%d", + blkaddr, exist); + set_sbi_flag(sbi, SBI_NEED_FSCK); + dump_stack(); +out_handle: + f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR); + return exist; +} + +static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi, + block_t blkaddr, int type) +{ + switch (type) { + case META_NAT: + break; + case META_SIT: + if (unlikely(blkaddr >= SIT_BLK_CNT(sbi))) + goto check_only; + break; + case META_SSA: + if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) || + blkaddr < SM_I(sbi)->ssa_blkaddr)) + goto check_only; + break; + case META_CP: + if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr || + blkaddr < __start_cp_addr(sbi))) + goto check_only; + break; + case META_POR: + if (unlikely(blkaddr >= MAX_BLKADDR(sbi) || + blkaddr < MAIN_BLKADDR(sbi))) + goto check_only; + break; + case DATA_GENERIC: + case DATA_GENERIC_ENHANCE: + case DATA_GENERIC_ENHANCE_READ: + case DATA_GENERIC_ENHANCE_UPDATE: + if (unlikely(blkaddr >= MAX_BLKADDR(sbi) || + blkaddr < MAIN_BLKADDR(sbi))) { + + /* Skip to emit an error message. */ + if (unlikely(f2fs_cp_error(sbi))) + return false; + + f2fs_warn(sbi, "access invalid blkaddr:%u", + blkaddr); + set_sbi_flag(sbi, SBI_NEED_FSCK); + dump_stack(); + goto err; + } else { + return __is_bitmap_valid(sbi, blkaddr, type); + } + break; + case META_GENERIC: + if (unlikely(blkaddr < SEG0_BLKADDR(sbi) || + blkaddr >= MAIN_BLKADDR(sbi))) + goto err; + break; + default: + BUG(); + } + + return true; +err: + f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR); +check_only: + return false; +} + +bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi, + block_t blkaddr, int type) +{ + if (time_to_inject(sbi, FAULT_BLKADDR_VALIDITY)) + return false; + return __f2fs_is_valid_blkaddr(sbi, blkaddr, type); +} + +bool f2fs_is_valid_blkaddr_raw(struct f2fs_sb_info *sbi, + block_t blkaddr, int type) +{ + return __f2fs_is_valid_blkaddr(sbi, blkaddr, type); +} + +/* + * Readahead CP/NAT/SIT/SSA/POR pages + */ +int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, + int type, bool sync) +{ + block_t blkno = start; + struct f2fs_io_info fio = { + .sbi = sbi, + .type = META, + .op = REQ_OP_READ, + .op_flags = sync ? (REQ_META | REQ_PRIO) : REQ_RAHEAD, + .encrypted_page = NULL, + .in_list = 0, + .is_por = (type == META_POR) ? 1 : 0, + }; + struct blk_plug plug; + int err; + + if (unlikely(type == META_POR)) + fio.op_flags &= ~REQ_META; + + blk_start_plug(&plug); + for (; nrpages-- > 0; blkno++) { + struct folio *folio; + + if (!f2fs_is_valid_blkaddr(sbi, blkno, type)) + goto out; + + switch (type) { + case META_NAT: + if (unlikely(blkno >= + NAT_BLOCK_OFFSET(NM_I(sbi)->max_nid))) + blkno = 0; + /* get nat block addr */ + fio.new_blkaddr = current_nat_addr(sbi, + blkno * NAT_ENTRY_PER_BLOCK); + break; + case META_SIT: + if (unlikely(blkno >= TOTAL_SEGS(sbi))) + goto out; + /* get sit block addr */ + fio.new_blkaddr = current_sit_addr(sbi, + blkno * SIT_ENTRY_PER_BLOCK); + break; + case META_SSA: + case META_CP: + case META_POR: + fio.new_blkaddr = blkno; + break; + default: + BUG(); + } + + folio = f2fs_grab_cache_folio(META_MAPPING(sbi), + fio.new_blkaddr, false); + if (IS_ERR(folio)) + continue; + if (folio_test_uptodate(folio)) { + f2fs_folio_put(folio, true); + continue; + } + + fio.folio = folio; + err = f2fs_submit_page_bio(&fio); + f2fs_folio_put(folio, err ? true : false); + + if (!err) + f2fs_update_iostat(sbi, NULL, FS_META_READ_IO, + F2FS_BLKSIZE); + } +out: + blk_finish_plug(&plug); + return blkno - start; +} + +void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index, + unsigned int ra_blocks) +{ + struct folio *folio; + bool readahead = false; + + if (ra_blocks == RECOVERY_MIN_RA_BLOCKS) + return; + + folio = filemap_get_folio(META_MAPPING(sbi), index); + if (IS_ERR(folio) || !folio_test_uptodate(folio)) + readahead = true; + f2fs_folio_put(folio, false); + + if (readahead) + f2fs_ra_meta_pages(sbi, index, ra_blocks, META_POR, true); +} + +static bool __f2fs_write_meta_folio(struct folio *folio, + struct writeback_control *wbc, + enum iostat_type io_type) +{ + struct f2fs_sb_info *sbi = F2FS_F_SB(folio); + + trace_f2fs_writepage(folio, META); + + if (unlikely(f2fs_cp_error(sbi))) { + if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) { + folio_clear_uptodate(folio); + dec_page_count(sbi, F2FS_DIRTY_META); + folio_unlock(folio); + return true; + } + goto redirty_out; + } + if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) + goto redirty_out; + + f2fs_do_write_meta_page(sbi, folio, io_type); + dec_page_count(sbi, F2FS_DIRTY_META); + + folio_unlock(folio); + + if (unlikely(f2fs_cp_error(sbi))) + f2fs_submit_merged_write(sbi, META); + + return true; + +redirty_out: + folio_redirty_for_writepage(wbc, folio); + return false; +} + +static int f2fs_write_meta_pages(struct address_space *mapping, + struct writeback_control *wbc) +{ + struct f2fs_sb_info *sbi = F2FS_M_SB(mapping); + struct f2fs_lock_context lc; + long diff, written; + + if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) + goto skip_write; + + /* collect a number of dirty meta pages and write together */ + if (wbc->sync_mode != WB_SYNC_ALL && + get_pages(sbi, F2FS_DIRTY_META) < + nr_pages_to_skip(sbi, META)) + goto skip_write; + + /* if locked failed, cp will flush dirty pages instead */ + if (!f2fs_down_write_trylock_trace(&sbi->cp_global_sem, &lc)) + goto skip_write; + + trace_f2fs_writepages(mapping->host, wbc, META); + diff = nr_pages_to_write(sbi, META, wbc); + written = f2fs_sync_meta_pages(sbi, wbc->nr_to_write, FS_META_IO); + f2fs_up_write_trace(&sbi->cp_global_sem, &lc); + wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff); + return 0; + +skip_write: + wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META); + trace_f2fs_writepages(mapping->host, wbc, META); + return 0; +} + +long f2fs_sync_meta_pages(struct f2fs_sb_info *sbi, long nr_to_write, + enum iostat_type io_type) +{ + struct address_space *mapping = META_MAPPING(sbi); + pgoff_t index = 0, prev = ULONG_MAX; + struct folio_batch fbatch; + long nwritten = 0; + int nr_folios; + struct writeback_control wbc = {}; + struct blk_plug plug; + + folio_batch_init(&fbatch); + + blk_start_plug(&plug); + + while ((nr_folios = filemap_get_folios_tag(mapping, &index, + (pgoff_t)-1, + PAGECACHE_TAG_DIRTY, &fbatch))) { + int i; + + for (i = 0; i < nr_folios; i++) { + struct folio *folio = fbatch.folios[i]; + + if (nr_to_write != LONG_MAX && i != 0 && + folio->index != prev + + folio_nr_pages(fbatch.folios[i-1])) { + folio_batch_release(&fbatch); + goto stop; + } + + folio_lock(folio); + + if (unlikely(!is_meta_folio(folio))) { +continue_unlock: + folio_unlock(folio); + continue; + } + if (!folio_test_dirty(folio)) { + /* someone wrote it for us */ + goto continue_unlock; + } + + f2fs_folio_wait_writeback(folio, META, true, true); + + if (!folio_clear_dirty_for_io(folio)) + goto continue_unlock; + + if (!__f2fs_write_meta_folio(folio, &wbc, + io_type)) { + folio_unlock(folio); + break; + } + nwritten += folio_nr_pages(folio); + prev = folio->index; + if (unlikely(nwritten >= nr_to_write)) + break; + } + folio_batch_release(&fbatch); + cond_resched(); + } +stop: + if (nwritten) + f2fs_submit_merged_write(sbi, META); + + blk_finish_plug(&plug); + + return nwritten; +} + +static bool f2fs_dirty_meta_folio(struct address_space *mapping, + struct folio *folio) +{ + trace_f2fs_set_page_dirty(folio, META); + + if (!folio_test_uptodate(folio)) + folio_mark_uptodate(folio); + if (filemap_dirty_folio(mapping, folio)) { + inc_page_count(F2FS_M_SB(mapping), F2FS_DIRTY_META); + folio_set_f2fs_reference(folio); + return true; + } + return false; +} + +const struct address_space_operations f2fs_meta_aops = { + .writepages = f2fs_write_meta_pages, + .dirty_folio = f2fs_dirty_meta_folio, + .invalidate_folio = f2fs_invalidate_folio, + .release_folio = f2fs_release_folio, + .migrate_folio = filemap_migrate_folio, +}; + +static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, + unsigned int devidx, int type) +{ + struct inode_management *im = &sbi->im[type]; + struct ino_entry *e = NULL, *new = NULL; + int ret; + + if (type == FLUSH_INO) { + rcu_read_lock(); + e = radix_tree_lookup(&im->ino_root, ino); + rcu_read_unlock(); + } + +retry: + if (!e) + new = f2fs_kmem_cache_alloc(ino_entry_slab, + GFP_NOFS, true, NULL); + + ret = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL); + f2fs_bug_on(sbi, ret); + + spin_lock(&im->ino_lock); + e = radix_tree_lookup(&im->ino_root, ino); + if (!e) { + if (!new) { + spin_unlock(&im->ino_lock); + radix_tree_preload_end(); + goto retry; + } + e = new; + if (unlikely(radix_tree_insert(&im->ino_root, ino, e))) + f2fs_bug_on(sbi, 1); + + memset(e, 0, sizeof(struct ino_entry)); + e->ino = ino; + + list_add_tail(&e->list, &im->ino_list); + if (type != ORPHAN_INO) + im->ino_num++; + } + + if (type == FLUSH_INO) + f2fs_set_bit(devidx, (char *)&e->dirty_device); + + spin_unlock(&im->ino_lock); + radix_tree_preload_end(); + + if (new && e != new) + kmem_cache_free(ino_entry_slab, new); +} + +static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) +{ + struct inode_management *im = &sbi->im[type]; + struct ino_entry *e; + + spin_lock(&im->ino_lock); + e = radix_tree_lookup(&im->ino_root, ino); + if (e) { + list_del(&e->list); + radix_tree_delete(&im->ino_root, ino); + im->ino_num--; + spin_unlock(&im->ino_lock); + kmem_cache_free(ino_entry_slab, e); + return; + } + spin_unlock(&im->ino_lock); +} + +static void __set_ino_bitmap(struct f2fs_sb_info *sbi, nid_t ino, int type) +{ + struct inode_management *im = &sbi->im[type]; + unsigned long index = INO_SLOT_INDEX(ino); + unsigned int ofs = INO_BIT_OFFSET(ino); + void **slot, *entry; + unsigned long bitmap = 0; + int ret; + + ret = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL); + f2fs_bug_on(sbi, ret); + + spin_lock(&im->ino_lock); + slot = radix_tree_lookup_slot(&im->ino_root, index); + if (slot) { + entry = radix_tree_deref_slot_protected(slot, &im->ino_lock); + bitmap = xa_to_value(entry); + if (!(bitmap & (1UL << ofs))) { + bitmap |= (1UL << ofs); + entry = xa_mk_value(bitmap); + radix_tree_replace_slot(&im->ino_root, slot, entry); + } + } else { + bitmap |= (1UL << ofs); + entry = xa_mk_value(bitmap); + if (unlikely(radix_tree_insert(&im->ino_root, index, entry))) + f2fs_bug_on(sbi, 1); + } + spin_unlock(&im->ino_lock); + radix_tree_preload_end(); +} + +static void __clear_ino_bitmap(struct f2fs_sb_info *sbi, nid_t ino, int type) +{ + struct inode_management *im = &sbi->im[type]; + unsigned long index = INO_SLOT_INDEX(ino); + unsigned int ofs = INO_BIT_OFFSET(ino); + void **slot, *entry; + unsigned long bitmap; + + spin_lock(&im->ino_lock); + slot = radix_tree_lookup_slot(&im->ino_root, index); + if (slot) { + entry = radix_tree_deref_slot_protected(slot, &im->ino_lock); + bitmap = xa_to_value(entry); + if (bitmap & (1UL << ofs)) + bitmap &= ~(1UL << ofs); + + if (bitmap) { + entry = xa_mk_value(bitmap); + radix_tree_replace_slot(&im->ino_root, slot, entry); + } else { + radix_tree_delete(&im->ino_root, index); + } + } + spin_unlock(&im->ino_lock); +} + +static void f2fs_wait_for_inode_record(struct f2fs_sb_info *sbi, int mode) +{ + if (mode != APPEND_INO && mode != UPDATE_INO) + return; + + /* Let's wait for some pending updates for APPEND_INO and UPDATE_INO. */ + flush_workqueue(sbi->evict_wq); +} + +static void __f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, + unsigned int devidx, int type) +{ + if (type <= FLUSH_INO) + __add_ino_entry(sbi, ino, devidx, type); + else + __set_ino_bitmap(sbi, ino, type); +} + +void f2fs_add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) +{ + __f2fs_add_ino_entry(sbi, ino, 0, type); +} + +void f2fs_remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) +{ + if (type <= FLUSH_INO) + __remove_ino_entry(sbi, ino, type); + else + __clear_ino_bitmap(sbi, ino, type); +} + +/* mode should be APPEND_INO, UPDATE_INO, TRANS_DIR_INO and XATTR_DIR_INO */ +bool f2fs_exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode) +{ + struct inode_management *im = &sbi->im[mode]; + unsigned long index = INO_SLOT_INDEX(ino); + unsigned int ofs = INO_BIT_OFFSET(ino); + void *entry; + unsigned long bitmap; + + f2fs_bug_on(sbi, mode <= FLUSH_INO); + + spin_lock(&im->ino_lock); + entry = radix_tree_lookup(&im->ino_root, index); + if (!entry) { + spin_unlock(&im->ino_lock); + return false; + } + bitmap = xa_to_value(entry); + spin_unlock(&im->ino_lock); + + return bitmap & (1UL << ofs); +} + +void f2fs_release_ino_entry(struct f2fs_sb_info *sbi, bool all) +{ + struct ino_entry *e, *tmp; + int i; + + for (i = all ? ORPHAN_INO : FLUSH_INO; i <= FLUSH_INO; i++) { + struct inode_management *im = &sbi->im[i]; + + f2fs_wait_for_inode_record(sbi, i); + + spin_lock(&im->ino_lock); + list_for_each_entry_safe(e, tmp, &im->ino_list, list) { + list_del(&e->list); + radix_tree_delete(&im->ino_root, e->ino); + kmem_cache_free(ino_entry_slab, e); + im->ino_num--; + } + spin_unlock(&im->ino_lock); + } + + for (i = APPEND_INO; i < MAX_INO_ENTRY; i++) { + struct inode_management *im = &sbi->im[i]; + + spin_lock(&im->ino_lock); + xa_destroy(&im->ino_root); + spin_unlock(&im->ino_lock); + } +} + +void f2fs_set_dirty_device(struct f2fs_sb_info *sbi, nid_t ino, + unsigned int devidx, int type) +{ + __f2fs_add_ino_entry(sbi, ino, devidx, type); +} + +bool f2fs_is_dirty_device(struct f2fs_sb_info *sbi, nid_t ino, + unsigned int devidx, int type) +{ + struct inode_management *im = &sbi->im[type]; + struct ino_entry *e; + bool is_dirty = false; + + spin_lock(&im->ino_lock); + e = radix_tree_lookup(&im->ino_root, ino); + if (e && f2fs_test_bit(devidx, (char *)&e->dirty_device)) + is_dirty = true; + spin_unlock(&im->ino_lock); + return is_dirty; +} + +int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi) +{ + struct inode_management *im = &sbi->im[ORPHAN_INO]; + int err = 0; + + spin_lock(&im->ino_lock); + + if (time_to_inject(sbi, FAULT_ORPHAN)) { + spin_unlock(&im->ino_lock); + return -ENOSPC; + } + + if (unlikely(im->ino_num >= sbi->max_orphans)) + err = -ENOSPC; + else + im->ino_num++; + spin_unlock(&im->ino_lock); + + return err; +} + +void f2fs_release_orphan_inode(struct f2fs_sb_info *sbi) +{ + struct inode_management *im = &sbi->im[ORPHAN_INO]; + + spin_lock(&im->ino_lock); + f2fs_bug_on(sbi, im->ino_num == 0); + im->ino_num--; + spin_unlock(&im->ino_lock); +} + +void f2fs_add_orphan_inode(struct inode *inode) +{ + /* add new orphan ino entry into list */ + f2fs_add_ino_entry(F2FS_I_SB(inode), inode->i_ino, ORPHAN_INO); + f2fs_update_inode_page(inode); +} + +void f2fs_remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) +{ + /* remove orphan entry from orphan list */ + f2fs_remove_ino_entry(sbi, ino, ORPHAN_INO); +} + +static int recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) +{ + struct inode *inode; + struct node_info ni; + int err; + + inode = f2fs_iget_retry(sbi->sb, ino); + if (IS_ERR(inode)) { + /* + * there should be a bug that we can't find the entry + * to orphan inode. + */ + f2fs_bug_on(sbi, PTR_ERR(inode) == -ENOENT); + return PTR_ERR(inode); + } + + err = f2fs_dquot_initialize(inode); + if (err) { + iput(inode); + goto err_out; + } + + clear_nlink(inode); + + /* truncate all the data during iput */ + iput(inode); + + err = f2fs_get_node_info(sbi, ino, &ni, false); + if (err) + goto err_out; + + /* ENOMEM was fully retried in f2fs_evict_inode. */ + if (ni.blk_addr != NULL_ADDR) { + err = -EIO; + goto err_out; + } + return 0; + +err_out: + set_sbi_flag(sbi, SBI_NEED_FSCK); + f2fs_warn(sbi, "%s: orphan failed (ino=%x), run fsck to fix.", + __func__, ino); + return err; +} + +int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi) +{ + block_t start_blk, orphan_blocks, i, j; + int err = 0; + + if (!is_set_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG)) + return 0; + + if (f2fs_hw_is_readonly(sbi)) { + f2fs_info(sbi, "write access unavailable, skipping orphan cleanup"); + return 0; + } + + if (is_sbi_flag_set(sbi, SBI_IS_WRITABLE)) + f2fs_info(sbi, "orphan cleanup on readonly fs"); + + start_blk = __start_cp_addr(sbi) + 1 + __cp_payload(sbi); + orphan_blocks = __start_sum_addr(sbi) - 1 - __cp_payload(sbi); + + f2fs_ra_meta_pages(sbi, start_blk, orphan_blocks, META_CP, true); + + for (i = 0; i < orphan_blocks; i++) { + struct folio *folio; + struct f2fs_orphan_block *orphan_blk; + unsigned int entry_count; + + folio = f2fs_get_meta_folio(sbi, start_blk + i); + if (IS_ERR(folio)) { + err = PTR_ERR(folio); + goto out; + } + + orphan_blk = folio_address(folio); + entry_count = le32_to_cpu(orphan_blk->entry_count); + if (entry_count > F2FS_ORPHANS_PER_BLOCK) { + f2fs_err(sbi, "invalid orphan inode entry count %u", + entry_count); + set_sbi_flag(sbi, SBI_NEED_FSCK); + f2fs_handle_error(sbi, ERROR_INCONSISTENT_ORPHAN); + err = -EFSCORRUPTED; + f2fs_folio_put(folio, true); + goto out; + } + + for (j = 0; j < entry_count; j++) { + nid_t ino = le32_to_cpu(orphan_blk->ino[j]); + + err = recover_orphan_inode(sbi, ino); + if (err) { + f2fs_folio_put(folio, true); + goto out; + } + } + f2fs_folio_put(folio, true); + } + /* clear Orphan Flag */ + clear_ckpt_flags(sbi, CP_ORPHAN_PRESENT_FLAG); +out: + set_sbi_flag(sbi, SBI_IS_RECOVERED); + + return err; +} + +static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk) +{ + struct list_head *head; + struct f2fs_orphan_block *orphan_blk = NULL; + unsigned int nentries = 0; + unsigned short index = 1; + unsigned short orphan_blocks; + struct folio *folio = NULL; + struct ino_entry *orphan = NULL; + struct inode_management *im = &sbi->im[ORPHAN_INO]; + + orphan_blocks = GET_ORPHAN_BLOCKS(im->ino_num); + + /* + * we don't need to do spin_lock(&im->ino_lock) here, since all the + * orphan inode operations are covered under f2fs_lock_op(). + * And, spin_lock should be avoided due to page operations below. + */ + head = &im->ino_list; + + /* loop for each orphan inode entry and write them in journal block */ + list_for_each_entry(orphan, head, list) { + if (!folio) { + folio = f2fs_grab_meta_folio(sbi, start_blk++); + orphan_blk = folio_address(folio); + memset(orphan_blk, 0, sizeof(*orphan_blk)); + } + + orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino); + + if (nentries == F2FS_ORPHANS_PER_BLOCK) { + /* + * an orphan block is full of 1020 entries, + * then we need to flush current orphan blocks + * and bring another one in memory + */ + orphan_blk->blk_addr = cpu_to_le16(index); + orphan_blk->blk_count = cpu_to_le16(orphan_blocks); + orphan_blk->entry_count = cpu_to_le32(nentries); + folio_mark_dirty(folio); + f2fs_folio_put(folio, true); + index++; + nentries = 0; + folio = NULL; + } + } + + if (folio) { + orphan_blk->blk_addr = cpu_to_le16(index); + orphan_blk->blk_count = cpu_to_le16(orphan_blocks); + orphan_blk->entry_count = cpu_to_le32(nentries); + folio_mark_dirty(folio); + f2fs_folio_put(folio, true); + } +} + +static __u32 f2fs_checkpoint_chksum(struct f2fs_checkpoint *ckpt) +{ + unsigned int chksum_ofs = le32_to_cpu(ckpt->checksum_offset); + __u32 chksum; + + chksum = f2fs_crc32(ckpt, chksum_ofs); + if (chksum_ofs < CP_CHKSUM_OFFSET) { + chksum_ofs += sizeof(chksum); + chksum = f2fs_chksum(chksum, (__u8 *)ckpt + chksum_ofs, + F2FS_BLKSIZE - chksum_ofs); + } + return chksum; +} + +static int get_checkpoint_version(struct f2fs_sb_info *sbi, block_t cp_addr, + struct f2fs_checkpoint **cp_block, struct folio **cp_folio, + unsigned long long *version) +{ + size_t crc_offset = 0; + __u32 crc; + + *cp_folio = f2fs_get_meta_folio(sbi, cp_addr); + if (IS_ERR(*cp_folio)) + return PTR_ERR(*cp_folio); + + *cp_block = folio_address(*cp_folio); + + crc_offset = le32_to_cpu((*cp_block)->checksum_offset); + if (crc_offset < CP_MIN_CHKSUM_OFFSET || + crc_offset > CP_CHKSUM_OFFSET) { + f2fs_folio_put(*cp_folio, true); + f2fs_warn(sbi, "invalid crc_offset: %zu", crc_offset); + return -EINVAL; + } + + crc = f2fs_checkpoint_chksum(*cp_block); + if (crc != cur_cp_crc(*cp_block)) { + f2fs_folio_put(*cp_folio, true); + f2fs_warn(sbi, "invalid crc value"); + return -EINVAL; + } + + *version = cur_cp_version(*cp_block); + return 0; +} + +static struct folio *validate_checkpoint(struct f2fs_sb_info *sbi, + block_t cp_addr, unsigned long long *version) +{ + struct folio *cp_folio_1 = NULL, *cp_folio_2 = NULL; + struct f2fs_checkpoint *cp_block = NULL; + unsigned long long cur_version = 0, pre_version = 0; + unsigned int cp_blocks; + int err; + + err = get_checkpoint_version(sbi, cp_addr, &cp_block, + &cp_folio_1, version); + if (err) + return NULL; + + cp_blocks = le32_to_cpu(cp_block->cp_pack_total_block_count); + + if (cp_blocks > BLKS_PER_SEG(sbi) || cp_blocks <= F2FS_CP_PACKS) { + f2fs_warn(sbi, "invalid cp_pack_total_block_count:%u", + le32_to_cpu(cp_block->cp_pack_total_block_count)); + goto invalid_cp; + } + pre_version = *version; + + cp_addr += cp_blocks - 1; + err = get_checkpoint_version(sbi, cp_addr, &cp_block, + &cp_folio_2, version); + if (err) + goto invalid_cp; + cur_version = *version; + + if (cur_version == pre_version) { + *version = cur_version; + f2fs_folio_put(cp_folio_2, true); + return cp_folio_1; + } + f2fs_folio_put(cp_folio_2, true); +invalid_cp: + f2fs_folio_put(cp_folio_1, true); + return NULL; +} + +int f2fs_get_valid_checkpoint(struct f2fs_sb_info *sbi) +{ + struct f2fs_checkpoint *cp_block; + struct f2fs_super_block *fsb = sbi->raw_super; + struct folio *cp1, *cp2, *cur_folio; + unsigned long blk_size = sbi->blocksize; + unsigned long long cp1_version = 0, cp2_version = 0; + unsigned long long cp_start_blk_no; + unsigned int cp_blks = 1 + __cp_payload(sbi); + block_t cp_blk_no; + int i; + int err; + + sbi->ckpt = f2fs_kvzalloc(sbi, array_size(blk_size, cp_blks), + GFP_KERNEL); + if (!sbi->ckpt) + return -ENOMEM; + /* + * Finding out valid cp block involves read both + * sets( cp pack 1 and cp pack 2) + */ + cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr); + cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version); + + /* The second checkpoint pack should start at the next segment */ + cp_start_blk_no += ((unsigned long long)1) << + le32_to_cpu(fsb->log_blocks_per_seg); + cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version); + + if (cp1 && cp2) { + if (ver_after(cp2_version, cp1_version)) + cur_folio = cp2; + else + cur_folio = cp1; + } else if (cp1) { + cur_folio = cp1; + } else if (cp2) { + cur_folio = cp2; + } else { + err = -EFSCORRUPTED; + goto fail_no_cp; + } + + cp_block = folio_address(cur_folio); + memcpy(sbi->ckpt, cp_block, blk_size); + + if (cur_folio == cp1) + sbi->cur_cp_pack = 1; + else + sbi->cur_cp_pack = 2; + + /* Sanity checking of checkpoint */ + if (f2fs_sanity_check_ckpt(sbi)) { + err = -EFSCORRUPTED; + goto free_fail_no_cp; + } + + if (cp_blks <= 1) + goto done; + + cp_blk_no = le32_to_cpu(fsb->cp_blkaddr); + if (cur_folio == cp2) + cp_blk_no += BIT(le32_to_cpu(fsb->log_blocks_per_seg)); + + for (i = 1; i < cp_blks; i++) { + void *sit_bitmap_ptr; + unsigned char *ckpt = (unsigned char *)sbi->ckpt; + + cur_folio = f2fs_get_meta_folio(sbi, cp_blk_no + i); + if (IS_ERR(cur_folio)) { + err = PTR_ERR(cur_folio); + goto free_fail_no_cp; + } + sit_bitmap_ptr = folio_address(cur_folio); + memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size); + f2fs_folio_put(cur_folio, true); + } +done: + f2fs_folio_put(cp1, true); + f2fs_folio_put(cp2, true); + return 0; + +free_fail_no_cp: + f2fs_folio_put(cp1, true); + f2fs_folio_put(cp2, true); +fail_no_cp: + kvfree(sbi->ckpt); + return err; +} + +static void __add_dirty_inode(struct inode *inode, enum inode_type type) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE; + + if (is_inode_flag_set(inode, flag)) + return; + + set_inode_flag(inode, flag); + list_add_tail(&F2FS_I(inode)->dirty_list, &sbi->inode_list[type]); + stat_inc_dirty_inode(sbi, type); +} + +static void __remove_dirty_inode(struct inode *inode, enum inode_type type) +{ + int flag = (type == DIR_INODE) ? FI_DIRTY_DIR : FI_DIRTY_FILE; + + if (get_dirty_pages(inode) || !is_inode_flag_set(inode, flag)) + return; + + list_del_init(&F2FS_I(inode)->dirty_list); + clear_inode_flag(inode, flag); + stat_dec_dirty_inode(F2FS_I_SB(inode), type); +} + +void f2fs_update_dirty_folio(struct inode *inode, struct folio *folio) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE; + + if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && + !S_ISLNK(inode->i_mode)) + return; + + spin_lock(&sbi->inode_lock[type]); + if (type != FILE_INODE || test_opt(sbi, DATA_FLUSH)) + __add_dirty_inode(inode, type); + inode_inc_dirty_pages(inode); + spin_unlock(&sbi->inode_lock[type]); + + folio_set_f2fs_reference(folio); +} + +void f2fs_remove_dirty_inode(struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + enum inode_type type = S_ISDIR(inode->i_mode) ? DIR_INODE : FILE_INODE; + + if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && + !S_ISLNK(inode->i_mode)) + return; + + if (type == FILE_INODE && !test_opt(sbi, DATA_FLUSH)) + return; + + spin_lock(&sbi->inode_lock[type]); + __remove_dirty_inode(inode, type); + spin_unlock(&sbi->inode_lock[type]); +} + +int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type, + bool from_cp) +{ + struct list_head *head; + struct inode *inode; + struct f2fs_inode_info *fi; + bool is_dir = (type == DIR_INODE); + unsigned long ino = 0; + + trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir, + get_pages(sbi, is_dir ? + F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); +retry: + if (unlikely(f2fs_cp_error(sbi))) { + trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir, + get_pages(sbi, is_dir ? + F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); + return -EIO; + } + + spin_lock(&sbi->inode_lock[type]); + + head = &sbi->inode_list[type]; + if (list_empty(head)) { + spin_unlock(&sbi->inode_lock[type]); + trace_f2fs_sync_dirty_inodes_exit(sbi->sb, is_dir, + get_pages(sbi, is_dir ? + F2FS_DIRTY_DENTS : F2FS_DIRTY_DATA)); + return 0; + } + fi = list_first_entry(head, struct f2fs_inode_info, dirty_list); + inode = igrab(&fi->vfs_inode); + spin_unlock(&sbi->inode_lock[type]); + if (inode) { + unsigned long cur_ino = inode->i_ino; + + if (from_cp) + F2FS_I(inode)->cp_task = current; + F2FS_I(inode)->wb_task = current; + + filemap_fdatawrite(inode->i_mapping); + + F2FS_I(inode)->wb_task = NULL; + if (from_cp) + F2FS_I(inode)->cp_task = NULL; + + iput(inode); + /* We need to give cpu to another writers. */ + if (ino == cur_ino) + cond_resched(); + else + ino = cur_ino; + } else { + /* + * We should submit bio, since it exists several + * writebacking dentry pages in the freeing inode. + */ + f2fs_submit_merged_write(sbi, DATA); + cond_resched(); + } + goto retry; +} + +static int f2fs_sync_inode_meta(struct f2fs_sb_info *sbi) +{ + struct list_head *head = &sbi->inode_list[DIRTY_META]; + struct inode *inode; + struct f2fs_inode_info *fi; + s64 total = get_pages(sbi, F2FS_DIRTY_IMETA); + + while (total--) { + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + + spin_lock(&sbi->inode_lock[DIRTY_META]); + if (list_empty(head)) { + spin_unlock(&sbi->inode_lock[DIRTY_META]); + return 0; + } + fi = list_first_entry(head, struct f2fs_inode_info, + gdirty_list); + inode = igrab(&fi->vfs_inode); + spin_unlock(&sbi->inode_lock[DIRTY_META]); + if (inode) { + sync_inode_metadata(inode, 0); + + /* it's on eviction */ + if (is_inode_flag_set(inode, FI_DIRTY_INODE)) + f2fs_update_inode_page(inode); + iput(inode); + } + } + return 0; +} + +static void __prepare_cp_block(struct f2fs_sb_info *sbi) +{ + struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + struct f2fs_nm_info *nm_i = NM_I(sbi); + nid_t last_nid = nm_i->next_scan_nid; + + next_free_nid(sbi, &last_nid); + ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi)); + ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi)); + ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi)); + ckpt->next_free_nid = cpu_to_le32(last_nid); + + /* update user_block_counts */ + sbi->last_valid_block_count = sbi->total_valid_block_count; + percpu_counter_set(&sbi->alloc_valid_block_count, 0); + percpu_counter_set(&sbi->rf_node_block_count, 0); +} + +static bool __need_flush_quota(struct f2fs_sb_info *sbi) +{ + bool ret = false; + + if (!is_journalled_quota(sbi)) + return false; + + if (!f2fs_down_write_trylock(&sbi->quota_sem)) + return true; + if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) { + ret = false; + } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR)) { + ret = false; + } else if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH)) { + clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH); + ret = true; + } else if (get_pages(sbi, F2FS_DIRTY_QDATA)) { + ret = true; + } + f2fs_up_write(&sbi->quota_sem); + return ret; +} + +/* + * Freeze all the FS-operations for checkpoint. + */ +static int block_operations(struct f2fs_sb_info *sbi) +{ + struct writeback_control wbc = { + .sync_mode = WB_SYNC_ALL, + .nr_to_write = LONG_MAX, + }; + int err = 0, cnt = 0; + + /* + * Let's flush inline_data in dirty node pages. + */ + f2fs_flush_inline_data(sbi); + +retry_flush_quotas: + f2fs_lock_all(sbi); + if (__need_flush_quota(sbi)) { + bool need_lock = sbi->umount_lock_holder != current; + + if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) { + set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH); + set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH); + goto retry_flush_dents; + } + f2fs_unlock_all(sbi); + + /* don't grab s_umount lock during mount/umount/remount/freeze/quotactl */ + if (!need_lock) { + f2fs_do_quota_sync(sbi->sb, -1); + } else if (down_read_trylock(&sbi->sb->s_umount)) { + f2fs_do_quota_sync(sbi->sb, -1); + up_read(&sbi->sb->s_umount); + } + cond_resched(); + goto retry_flush_quotas; + } + +retry_flush_dents: + /* write all the dirty dentry pages */ + if (get_pages(sbi, F2FS_DIRTY_DENTS)) { + f2fs_unlock_all(sbi); + err = f2fs_sync_dirty_inodes(sbi, DIR_INODE, true); + if (err) + return err; + cond_resched(); + goto retry_flush_quotas; + } + + /* + * POR: we should ensure that there are no dirty node pages + * until finishing nat/sit flush. inode->i_blocks can be updated. + */ + f2fs_down_write(&sbi->node_change); + + if (get_pages(sbi, F2FS_DIRTY_IMETA)) { + f2fs_up_write(&sbi->node_change); + f2fs_unlock_all(sbi); + err = f2fs_sync_inode_meta(sbi); + if (err) + return err; + cond_resched(); + goto retry_flush_quotas; + } + +retry_flush_nodes: + f2fs_down_write(&sbi->node_write); + + if (get_pages(sbi, F2FS_DIRTY_NODES)) { + f2fs_up_write(&sbi->node_write); + atomic_inc(&sbi->wb_sync_req[NODE]); + err = f2fs_sync_node_pages(sbi, &wbc, false, FS_CP_NODE_IO); + atomic_dec(&sbi->wb_sync_req[NODE]); + if (err) { + f2fs_up_write(&sbi->node_change); + f2fs_unlock_all(sbi); + return err; + } + cond_resched(); + goto retry_flush_nodes; + } + + /* + * sbi->node_change is used only for AIO write_begin path which produces + * dirty node blocks and some checkpoint values by block allocation. + */ + __prepare_cp_block(sbi); + f2fs_up_write(&sbi->node_change); + return err; +} + +static void unblock_operations(struct f2fs_sb_info *sbi) +{ + f2fs_up_write(&sbi->node_write); + f2fs_unlock_all(sbi); +} + +void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type) +{ + DEFINE_WAIT(wait); + + for (;;) { + if (!get_pages(sbi, type)) + break; + + if (unlikely(f2fs_cp_error(sbi) && + !is_sbi_flag_set(sbi, SBI_IS_CLOSE))) + break; + + if (type == F2FS_DIRTY_META) + f2fs_sync_meta_pages(sbi, LONG_MAX, FS_CP_META_IO); + else if (type == F2FS_WB_CP_DATA) + f2fs_submit_merged_write(sbi, DATA); + + prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE); + io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT); + } + finish_wait(&sbi->cp_wait, &wait); +} + +static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc) +{ + unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num; + struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + unsigned long flags; + + spin_lock_irqsave(&sbi->cp_lock, flags); + + if ((cpc->reason & CP_UMOUNT) && + le32_to_cpu(ckpt->cp_pack_total_block_count) > + sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks) + disable_nat_bits(sbi, false); + + if (cpc->reason & CP_TRIMMED) + __set_ckpt_flags(ckpt, CP_TRIMMED_FLAG); + else + __clear_ckpt_flags(ckpt, CP_TRIMMED_FLAG); + + if (cpc->reason & CP_UMOUNT) + __set_ckpt_flags(ckpt, CP_UMOUNT_FLAG); + else + __clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG); + + if (cpc->reason & CP_FASTBOOT) + __set_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); + else + __clear_ckpt_flags(ckpt, CP_FASTBOOT_FLAG); + + if (orphan_num) + __set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); + else + __clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); + + if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) + __set_ckpt_flags(ckpt, CP_FSCK_FLAG); + + if (is_sbi_flag_set(sbi, SBI_IS_RESIZEFS)) + __set_ckpt_flags(ckpt, CP_RESIZEFS_FLAG); + else + __clear_ckpt_flags(ckpt, CP_RESIZEFS_FLAG); + + if (is_sbi_flag_set(sbi, SBI_CP_DISABLED)) + __set_ckpt_flags(ckpt, CP_DISABLED_FLAG); + else + __clear_ckpt_flags(ckpt, CP_DISABLED_FLAG); + + if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK)) + __set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG); + else + __clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG); + + if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) + __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG); + else + __clear_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG); + + if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_REPAIR)) + __set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG); + + /* set this flag to activate crc|cp_ver for recovery */ + __set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG); + __clear_ckpt_flags(ckpt, CP_NOCRC_RECOVERY_FLAG); + + spin_unlock_irqrestore(&sbi->cp_lock, flags); +} + +static void commit_checkpoint(struct f2fs_sb_info *sbi, + void *src, block_t blk_addr) +{ + struct writeback_control wbc = {}; + + /* + * filemap_get_folios_tag and folio_lock again will take + * some extra time. Therefore, f2fs_update_meta_pages and + * f2fs_sync_meta_pages are combined in this function. + */ + struct folio *folio = f2fs_grab_meta_folio(sbi, blk_addr); + + memcpy(folio_address(folio), src, PAGE_SIZE); + + folio_mark_dirty(folio); + if (unlikely(!folio_clear_dirty_for_io(folio))) + f2fs_bug_on(sbi, 1); + + /* writeout cp pack 2 page */ + if (unlikely(!__f2fs_write_meta_folio(folio, &wbc, FS_CP_META_IO))) { + if (f2fs_cp_error(sbi)) { + f2fs_folio_put(folio, true); + return; + } + f2fs_bug_on(sbi, true); + } + + f2fs_folio_put(folio, false); + + /* submit checkpoint (with barrier if NOBARRIER is not set) */ + f2fs_submit_merged_write(sbi, META_FLUSH); +} + +static inline u64 get_sectors_written(struct block_device *bdev) +{ + return (u64)part_stat_read(bdev, sectors[STAT_WRITE]); +} + +u64 f2fs_get_sectors_written(struct f2fs_sb_info *sbi) +{ + if (f2fs_is_multi_device(sbi)) { + u64 sectors = 0; + int i; + + for (i = 0; i < sbi->s_ndevs; i++) + sectors += get_sectors_written(FDEV(i).bdev); + + return sectors; + } + + return get_sectors_written(sbi->sb->s_bdev); +} + +static inline void stat_cp_time(struct cp_control *cpc, enum cp_time type) +{ + cpc->stats.times[type] = ktime_get(); +} + +static inline void check_cp_time(struct f2fs_sb_info *sbi, struct cp_control *cpc) +{ + unsigned long long sb_diff, cur_diff; + enum cp_time ct; + + sb_diff = (u64)ktime_ms_delta(sbi->cp_stats.times[CP_TIME_END], + sbi->cp_stats.times[CP_TIME_START]); + cur_diff = (u64)ktime_ms_delta(cpc->stats.times[CP_TIME_END], + cpc->stats.times[CP_TIME_START]); + + if (cur_diff > sb_diff) { + sbi->cp_stats = cpc->stats; + if (cur_diff < CP_LONG_LATENCY_THRESHOLD) + return; + + f2fs_warn(sbi, "checkpoint was blocked for %llu ms", cur_diff); + for (ct = CP_TIME_START; ct < CP_TIME_MAX - 1; ct++) + f2fs_warn(sbi, "Step#%d: %llu ms", ct, + (u64)ktime_ms_delta(cpc->stats.times[ct + 1], + cpc->stats.times[ct])); + } +} + +static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) +{ + struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + struct f2fs_nm_info *nm_i = NM_I(sbi); + unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags; + block_t start_blk; + unsigned int data_sum_blocks, orphan_blocks; + __u32 crc32 = 0; + int i; + int cp_payload_blks = __cp_payload(sbi); + struct curseg_info *seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE); + u64 kbytes_written; + int err; + + /* Flush all the NAT/SIT pages */ + f2fs_sync_meta_pages(sbi, LONG_MAX, FS_CP_META_IO); + + stat_cp_time(cpc, CP_TIME_SYNC_META); + + /* start to update checkpoint, cp ver is already updated previously */ + ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi, true)); + ckpt->free_segment_count = cpu_to_le32(free_segments(sbi)); + for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) { + struct curseg_info *curseg = CURSEG_I(sbi, i + CURSEG_HOT_NODE); + + ckpt->cur_node_segno[i] = cpu_to_le32(curseg->segno); + ckpt->cur_node_blkoff[i] = cpu_to_le16(curseg->next_blkoff); + ckpt->alloc_type[i + CURSEG_HOT_NODE] = curseg->alloc_type; + } + for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) { + struct curseg_info *curseg = CURSEG_I(sbi, i + CURSEG_HOT_DATA); + + ckpt->cur_data_segno[i] = cpu_to_le32(curseg->segno); + ckpt->cur_data_blkoff[i] = cpu_to_le16(curseg->next_blkoff); + ckpt->alloc_type[i + CURSEG_HOT_DATA] = curseg->alloc_type; + } + + /* 2 cp + n data seg summary + orphan inode blocks */ + data_sum_blocks = f2fs_npages_for_summary_flush(sbi, false); + spin_lock_irqsave(&sbi->cp_lock, flags); + if (data_sum_blocks < NR_CURSEG_DATA_TYPE) + __set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); + else + __clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); + spin_unlock_irqrestore(&sbi->cp_lock, flags); + + orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num); + ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks + + orphan_blocks); + + if (__remain_node_summaries(cpc->reason)) + ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS + + cp_payload_blks + data_sum_blocks + + orphan_blocks + NR_CURSEG_NODE_TYPE); + else + ckpt->cp_pack_total_block_count = cpu_to_le32(F2FS_CP_PACKS + + cp_payload_blks + data_sum_blocks + + orphan_blocks); + + /* update ckpt flag for checkpoint */ + update_ckpt_flags(sbi, cpc); + + /* update SIT/NAT bitmap */ + get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP)); + get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP)); + + crc32 = f2fs_checkpoint_chksum(ckpt); + *((__le32 *)((unsigned char *)ckpt + + le32_to_cpu(ckpt->checksum_offset))) + = cpu_to_le32(crc32); + + start_blk = __start_cp_next_addr(sbi); + + /* write nat bits */ + if (enabled_nat_bits(sbi, cpc)) { + __u64 cp_ver = cur_cp_version(ckpt); + block_t blk; + + cp_ver |= ((__u64)crc32 << 32); + *(__le64 *)nm_i->nat_bits = cpu_to_le64(cp_ver); + + blk = start_blk + BLKS_PER_SEG(sbi) - nm_i->nat_bits_blocks; + for (i = 0; i < nm_i->nat_bits_blocks; i++) + f2fs_update_meta_page(sbi, nm_i->nat_bits + + F2FS_BLK_TO_BYTES(i), blk + i); + } + + /* write out checkpoint buffer at block 0 */ + f2fs_update_meta_page(sbi, ckpt, start_blk++); + + for (i = 1; i < 1 + cp_payload_blks; i++) + f2fs_update_meta_page(sbi, (char *)ckpt + i * F2FS_BLKSIZE, + start_blk++); + + if (orphan_num) { + write_orphan_inodes(sbi, start_blk); + start_blk += orphan_blocks; + } + + f2fs_write_data_summaries(sbi, start_blk); + start_blk += data_sum_blocks; + + /* Record write statistics in the hot node summary */ + kbytes_written = sbi->kbytes_written; + kbytes_written += (f2fs_get_sectors_written(sbi) - + sbi->sectors_written_start) >> 1; + seg_i->journal->info.kbytes_written = cpu_to_le64(kbytes_written); + + if (__remain_node_summaries(cpc->reason)) { + f2fs_write_node_summaries(sbi, start_blk); + start_blk += NR_CURSEG_NODE_TYPE; + } + + /* Here, we have one bio having CP pack except cp pack 2 page */ + f2fs_sync_meta_pages(sbi, LONG_MAX, FS_CP_META_IO); + stat_cp_time(cpc, CP_TIME_SYNC_CP_META); + + /* Wait for all dirty meta pages to be submitted for IO */ + f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META); + stat_cp_time(cpc, CP_TIME_WAIT_DIRTY_META); + + /* wait for previous submitted meta pages writeback */ + f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA); + stat_cp_time(cpc, CP_TIME_WAIT_CP_DATA); + + /* flush all device cache */ + err = f2fs_flush_device_cache(sbi); + if (err) + return err; + stat_cp_time(cpc, CP_TIME_FLUSH_DEVICE); + + /* barrier and flush checkpoint cp pack 2 page if it can */ + commit_checkpoint(sbi, ckpt, start_blk); + f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA); + stat_cp_time(cpc, CP_TIME_WAIT_LAST_CP); + + /* + * invalidate intermediate page cache borrowed from meta inode which are + * used for migration of encrypted, verity or compressed inode's blocks. + */ + if (f2fs_sb_has_encrypt(sbi) || f2fs_sb_has_verity(sbi) || + f2fs_sb_has_compression(sbi)) + f2fs_bug_on(sbi, + invalidate_inode_pages2_range(META_MAPPING(sbi), + MAIN_BLKADDR(sbi), MAX_BLKADDR(sbi) - 1)); + + f2fs_release_ino_entry(sbi, false); + + f2fs_reset_fsync_node_info(sbi); + + clear_sbi_flag(sbi, SBI_IS_DIRTY); + clear_sbi_flag(sbi, SBI_NEED_CP); + clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH); + + spin_lock(&sbi->stat_lock); + sbi->unusable_block_count = 0; + spin_unlock(&sbi->stat_lock); + + __set_cp_next_pack(sbi); + + /* + * redirty superblock if metadata like node page or inode cache is + * updated during writing checkpoint. + */ + if (get_pages(sbi, F2FS_DIRTY_NODES) || + get_pages(sbi, F2FS_DIRTY_IMETA)) + set_sbi_flag(sbi, SBI_IS_DIRTY); + + f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS)); + + return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0; +} + +int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc) +{ + struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); + struct f2fs_lock_context lc; + unsigned long long ckpt_ver; + int err = 0; + + stat_cp_time(cpc, CP_TIME_START); + + if (f2fs_readonly(sbi->sb) || f2fs_hw_is_readonly(sbi)) + return -EROFS; + + if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) { + if (cpc->reason != CP_PAUSE) + return 0; + f2fs_warn(sbi, "Start checkpoint disabled!"); + } + if (cpc->reason != CP_RESIZE) + f2fs_down_write_trace(&sbi->cp_global_sem, &lc); + + stat_cp_time(cpc, CP_TIME_LOCK); + + if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) && + ((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) || + ((cpc->reason & CP_DISCARD) && !sbi->discard_blks))) + goto out; + if (unlikely(f2fs_cp_error(sbi))) { + err = -EIO; + goto out; + } + + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_START_BLOCK_OPS); + + err = block_operations(sbi); + if (err) + goto out; + + stat_cp_time(cpc, CP_TIME_OP_LOCK); + + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_FINISH_BLOCK_OPS); + + f2fs_flush_merged_writes(sbi); + + /* this is the case of multiple fstrims without any changes */ + if (cpc->reason & CP_DISCARD) { + if (!f2fs_exist_trim_candidates(sbi, cpc)) { + unblock_operations(sbi); + goto out; + } + + if (NM_I(sbi)->nat_cnt[DIRTY_NAT] == 0 && + SIT_I(sbi)->dirty_sentries == 0 && + prefree_segments(sbi) == 0) { + f2fs_flush_sit_entries(sbi, cpc); + f2fs_clear_prefree_segments(sbi, cpc); + unblock_operations(sbi); + goto out; + } + } + stat_cp_time(cpc, CP_TIME_MERGE_WRITE); + + /* + * update checkpoint pack index + * Increase the version number so that + * SIT entries and seg summaries are written at correct place + */ + ckpt_ver = cur_cp_version(ckpt); + ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver); + + /* write cached NAT/SIT entries to NAT/SIT area */ + err = f2fs_flush_nat_entries(sbi, cpc); + if (err) { + f2fs_err(sbi, "f2fs_flush_nat_entries failed err:%d, stop checkpoint", err); + f2fs_bug_on(sbi, !f2fs_cp_error(sbi)); + goto stop; + } + stat_cp_time(cpc, CP_TIME_FLUSH_NAT); + + f2fs_flush_sit_entries(sbi, cpc); + + stat_cp_time(cpc, CP_TIME_FLUSH_SIT); + + /* save inmem log status */ + f2fs_save_inmem_curseg(sbi); + + err = do_checkpoint(sbi, cpc); + if (err) { + f2fs_err(sbi, "do_checkpoint failed err:%d, stop checkpoint", err); + f2fs_bug_on(sbi, !f2fs_cp_error(sbi)); + f2fs_release_discard_addrs(sbi); + } else { + f2fs_clear_prefree_segments(sbi, cpc); + } + + f2fs_restore_inmem_curseg(sbi); + f2fs_reinit_atgc_curseg(sbi); + stat_inc_cp_count(sbi); +stop: + unblock_operations(sbi); + stat_cp_time(cpc, CP_TIME_END); + check_cp_time(sbi, cpc); + + if (cpc->reason & CP_RECOVERY) + f2fs_notice(sbi, "checkpoint: version = %llx", ckpt_ver); + + /* update CP_TIME to trigger checkpoint periodically */ + f2fs_update_time(sbi, CP_TIME); + trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, CP_PHASE_FINISH_CHECKPOINT); +out: + if (cpc->reason != CP_RESIZE) + f2fs_up_write_trace(&sbi->cp_global_sem, &lc); + return err; +} + +void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi) +{ + int i; + + for (i = 0; i < MAX_INO_ENTRY; i++) { + struct inode_management *im = &sbi->im[i]; + + INIT_RADIX_TREE(&im->ino_root, GFP_ATOMIC); + spin_lock_init(&im->ino_lock); + INIT_LIST_HEAD(&im->ino_list); + im->ino_num = 0; + } + + sbi->max_orphans = (BLKS_PER_SEG(sbi) - F2FS_CP_PACKS - + NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) * + F2FS_ORPHANS_PER_BLOCK; +} + +int __init f2fs_create_checkpoint_caches(void) +{ + ino_entry_slab = f2fs_kmem_cache_create("f2fs_ino_entry", + sizeof(struct ino_entry)); + if (!ino_entry_slab) + return -ENOMEM; + f2fs_inode_entry_slab = f2fs_kmem_cache_create("f2fs_inode_entry", + sizeof(struct inode_entry)); + if (!f2fs_inode_entry_slab) { + kmem_cache_destroy(ino_entry_slab); + return -ENOMEM; + } + return 0; +} + +void f2fs_destroy_checkpoint_caches(void) +{ + kmem_cache_destroy(ino_entry_slab); + kmem_cache_destroy(f2fs_inode_entry_slab); +} + +static int __write_checkpoint_sync(struct f2fs_sb_info *sbi) +{ + struct cp_control cpc = { .reason = CP_SYNC, }; + struct f2fs_lock_context lc; + int err; + + f2fs_down_write_trace(&sbi->gc_lock, &lc); + err = f2fs_write_checkpoint(sbi, &cpc); + f2fs_up_write_trace(&sbi->gc_lock, &lc); + + return err; +} + +static void __checkpoint_and_complete_reqs(struct f2fs_sb_info *sbi) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + struct ckpt_req *req, *next; + struct llist_node *dispatch_list; + u64 sum_diff = 0, diff, count = 0; + int ret; + + dispatch_list = llist_del_all(&cprc->issue_list); + if (!dispatch_list) + return; + dispatch_list = llist_reverse_order(dispatch_list); + + ret = __write_checkpoint_sync(sbi); + atomic_inc(&cprc->issued_ckpt); + + llist_for_each_entry_safe(req, next, dispatch_list, llnode) { + diff = (u64)ktime_ms_delta(ktime_get(), req->queue_time); + req->ret = ret; + req->delta_time = diff; + complete(&req->wait); + + sum_diff += diff; + count++; + } + atomic_sub(count, &cprc->queued_ckpt); + atomic_add(count, &cprc->total_ckpt); + + spin_lock(&cprc->stat_lock); + cprc->cur_time = (unsigned int)div64_u64(sum_diff, count); + if (cprc->peak_time < cprc->cur_time) + cprc->peak_time = cprc->cur_time; + spin_unlock(&cprc->stat_lock); +} + +static int issue_checkpoint_thread(void *data) +{ + struct f2fs_sb_info *sbi = data; + struct ckpt_req_control *cprc = &sbi->cprc_info; + wait_queue_head_t *q = &cprc->ckpt_wait_queue; +repeat: + if (kthread_should_stop()) + return 0; + + if (!llist_empty(&cprc->issue_list)) + __checkpoint_and_complete_reqs(sbi); + + wait_event_interruptible(*q, + kthread_should_stop() || !llist_empty(&cprc->issue_list)); + goto repeat; +} + +static void flush_remained_ckpt_reqs(struct f2fs_sb_info *sbi, + struct ckpt_req *wait_req) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + + if (!llist_empty(&cprc->issue_list)) { + __checkpoint_and_complete_reqs(sbi); + } else { + /* already dispatched by issue_checkpoint_thread */ + if (wait_req) + wait_for_completion(&wait_req->wait); + } +} + +static void init_ckpt_req(struct ckpt_req *req) +{ + memset(req, 0, sizeof(struct ckpt_req)); + + init_completion(&req->wait); + req->queue_time = ktime_get(); +} + +int f2fs_issue_checkpoint(struct f2fs_sb_info *sbi) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + struct ckpt_req req; + struct cp_control cpc; + + cpc.reason = __get_cp_reason(sbi); + if (!test_opt(sbi, MERGE_CHECKPOINT) || cpc.reason != CP_SYNC || + sbi->umount_lock_holder == current) { + struct f2fs_lock_context lc; + int ret; + + f2fs_down_write_trace(&sbi->gc_lock, &lc); + ret = f2fs_write_checkpoint(sbi, &cpc); + f2fs_up_write_trace(&sbi->gc_lock, &lc); + + return ret; + } + + if (!cprc->f2fs_issue_ckpt) + return __write_checkpoint_sync(sbi); + + init_ckpt_req(&req); + + llist_add(&req.llnode, &cprc->issue_list); + atomic_inc(&cprc->queued_ckpt); + + /* + * update issue_list before we wake up issue_checkpoint thread, + * this smp_mb() pairs with another barrier in ___wait_event(), + * see more details in comments of waitqueue_active(). + */ + smp_mb(); + + if (waitqueue_active(&cprc->ckpt_wait_queue)) + wake_up(&cprc->ckpt_wait_queue); + + if (cprc->f2fs_issue_ckpt) + wait_for_completion(&req.wait); + else + flush_remained_ckpt_reqs(sbi, &req); + + if (unlikely(req.delta_time >= CP_LONG_LATENCY_THRESHOLD)) { + f2fs_warn_ratelimited(sbi, + "blocked on checkpoint for %u ms", cprc->peak_time); + dump_stack(); + } + + return req.ret; +} + +int f2fs_start_ckpt_thread(struct f2fs_sb_info *sbi) +{ + dev_t dev = sbi->sb->s_bdev->bd_dev; + struct ckpt_req_control *cprc = &sbi->cprc_info; + + if (cprc->f2fs_issue_ckpt) + return 0; + + cprc->f2fs_issue_ckpt = kthread_run(issue_checkpoint_thread, sbi, + "f2fs_ckpt-%u:%u", MAJOR(dev), MINOR(dev)); + if (IS_ERR(cprc->f2fs_issue_ckpt)) { + int err = PTR_ERR(cprc->f2fs_issue_ckpt); + + cprc->f2fs_issue_ckpt = NULL; + return err; + } + + set_task_ioprio(cprc->f2fs_issue_ckpt, cprc->ckpt_thread_ioprio); + set_user_nice(cprc->f2fs_issue_ckpt, + PRIO_TO_NICE(sbi->critical_task_priority)); + + return 0; +} + +void f2fs_stop_ckpt_thread(struct f2fs_sb_info *sbi) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + struct task_struct *ckpt_task; + + if (!cprc->f2fs_issue_ckpt) + return; + + ckpt_task = cprc->f2fs_issue_ckpt; + cprc->f2fs_issue_ckpt = NULL; + kthread_stop(ckpt_task); + + f2fs_flush_ckpt_thread(sbi); +} + +void f2fs_flush_ckpt_thread(struct f2fs_sb_info *sbi) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + + flush_remained_ckpt_reqs(sbi, NULL); + + /* Let's wait for the previous dispatched checkpoint. */ + while (atomic_read(&cprc->queued_ckpt)) + io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT); +} + +void f2fs_init_ckpt_req_control(struct f2fs_sb_info *sbi) +{ + struct ckpt_req_control *cprc = &sbi->cprc_info; + + atomic_set(&cprc->issued_ckpt, 0); + atomic_set(&cprc->total_ckpt, 0); + atomic_set(&cprc->queued_ckpt, 0); + cprc->ckpt_thread_ioprio = DEFAULT_CHECKPOINT_IOPRIO; + init_waitqueue_head(&cprc->ckpt_wait_queue); + init_llist_head(&cprc->issue_list); + spin_lock_init(&cprc->stat_lock); +} |