summaryrefslogtreecommitdiffstats
path: root/fs/f2fs/gc.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /fs/f2fs/gc.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/f2fs/gc.c')
-rw-r--r--fs/f2fs/gc.c2250
1 files changed, 2250 insertions, 0 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
new file mode 100644
index 000000000..ec7212f7a
--- /dev/null
+++ b/fs/f2fs/gc.c
@@ -0,0 +1,2250 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/f2fs/gc.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ */
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/f2fs_fs.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/sched/signal.h>
+#include <linux/random.h>
+#include <linux/sched/mm.h>
+
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+#include "gc.h"
+#include "iostat.h"
+#include <trace/events/f2fs.h>
+
+static struct kmem_cache *victim_entry_slab;
+
+static unsigned int count_bits(const unsigned long *addr,
+ unsigned int offset, unsigned int len);
+
+static int gc_thread_func(void *data)
+{
+ struct f2fs_sb_info *sbi = data;
+ struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
+ wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
+ wait_queue_head_t *fggc_wq = &sbi->gc_thread->fggc_wq;
+ unsigned int wait_ms;
+ struct f2fs_gc_control gc_control = {
+ .victim_segno = NULL_SEGNO,
+ .should_migrate_blocks = false,
+ .err_gc_skipped = false };
+
+ wait_ms = gc_th->min_sleep_time;
+
+ set_freezable();
+ do {
+ bool sync_mode, foreground = false;
+
+ wait_event_interruptible_timeout(*wq,
+ kthread_should_stop() || freezing(current) ||
+ waitqueue_active(fggc_wq) ||
+ gc_th->gc_wake,
+ msecs_to_jiffies(wait_ms));
+
+ if (test_opt(sbi, GC_MERGE) && waitqueue_active(fggc_wq))
+ foreground = true;
+
+ /* give it a try one time */
+ if (gc_th->gc_wake)
+ gc_th->gc_wake = 0;
+
+ if (try_to_freeze()) {
+ stat_other_skip_bggc_count(sbi);
+ continue;
+ }
+ if (kthread_should_stop())
+ break;
+
+ if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
+ increase_sleep_time(gc_th, &wait_ms);
+ stat_other_skip_bggc_count(sbi);
+ continue;
+ }
+
+ if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
+ f2fs_show_injection_info(sbi, FAULT_CHECKPOINT);
+ f2fs_stop_checkpoint(sbi, false,
+ STOP_CP_REASON_FAULT_INJECT);
+ }
+
+ if (!sb_start_write_trylock(sbi->sb)) {
+ stat_other_skip_bggc_count(sbi);
+ continue;
+ }
+
+ /*
+ * [GC triggering condition]
+ * 0. GC is not conducted currently.
+ * 1. There are enough dirty segments.
+ * 2. IO subsystem is idle by checking the # of writeback pages.
+ * 3. IO subsystem is idle by checking the # of requests in
+ * bdev's request list.
+ *
+ * Note) We have to avoid triggering GCs frequently.
+ * Because it is possible that some segments can be
+ * invalidated soon after by user update or deletion.
+ * So, I'd like to wait some time to collect dirty segments.
+ */
+ if (sbi->gc_mode == GC_URGENT_HIGH ||
+ sbi->gc_mode == GC_URGENT_MID) {
+ wait_ms = gc_th->urgent_sleep_time;
+ f2fs_down_write(&sbi->gc_lock);
+ goto do_gc;
+ }
+
+ if (foreground) {
+ f2fs_down_write(&sbi->gc_lock);
+ goto do_gc;
+ } else if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
+ stat_other_skip_bggc_count(sbi);
+ goto next;
+ }
+
+ if (!is_idle(sbi, GC_TIME)) {
+ increase_sleep_time(gc_th, &wait_ms);
+ f2fs_up_write(&sbi->gc_lock);
+ stat_io_skip_bggc_count(sbi);
+ goto next;
+ }
+
+ if (has_enough_invalid_blocks(sbi))
+ decrease_sleep_time(gc_th, &wait_ms);
+ else
+ increase_sleep_time(gc_th, &wait_ms);
+do_gc:
+ if (!foreground)
+ stat_inc_bggc_count(sbi->stat_info);
+
+ sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC;
+
+ /* foreground GC was been triggered via f2fs_balance_fs() */
+ if (foreground)
+ sync_mode = false;
+
+ gc_control.init_gc_type = sync_mode ? FG_GC : BG_GC;
+ gc_control.no_bg_gc = foreground;
+ gc_control.nr_free_secs = foreground ? 1 : 0;
+
+ /* if return value is not zero, no victim was selected */
+ if (f2fs_gc(sbi, &gc_control)) {
+ /* don't bother wait_ms by foreground gc */
+ if (!foreground)
+ wait_ms = gc_th->no_gc_sleep_time;
+ }
+
+ if (foreground)
+ wake_up_all(&gc_th->fggc_wq);
+
+ trace_f2fs_background_gc(sbi->sb, wait_ms,
+ prefree_segments(sbi), free_segments(sbi));
+
+ /* balancing f2fs's metadata periodically */
+ f2fs_balance_fs_bg(sbi, true);
+next:
+ if (sbi->gc_mode == GC_URGENT_HIGH) {
+ spin_lock(&sbi->gc_urgent_high_lock);
+ if (sbi->gc_urgent_high_remaining) {
+ sbi->gc_urgent_high_remaining--;
+ if (!sbi->gc_urgent_high_remaining)
+ sbi->gc_mode = GC_NORMAL;
+ }
+ spin_unlock(&sbi->gc_urgent_high_lock);
+ }
+ sb_end_write(sbi->sb);
+
+ } while (!kthread_should_stop());
+ return 0;
+}
+
+int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
+{
+ struct f2fs_gc_kthread *gc_th;
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ int err = 0;
+
+ gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
+ if (!gc_th) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ gc_th->urgent_sleep_time = DEF_GC_THREAD_URGENT_SLEEP_TIME;
+ gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
+ gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
+ gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
+
+ gc_th->gc_wake = 0;
+
+ sbi->gc_thread = gc_th;
+ init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
+ init_waitqueue_head(&sbi->gc_thread->fggc_wq);
+ sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
+ "f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
+ if (IS_ERR(gc_th->f2fs_gc_task)) {
+ err = PTR_ERR(gc_th->f2fs_gc_task);
+ kfree(gc_th);
+ sbi->gc_thread = NULL;
+ }
+out:
+ return err;
+}
+
+void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi)
+{
+ struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
+
+ if (!gc_th)
+ return;
+ kthread_stop(gc_th->f2fs_gc_task);
+ wake_up_all(&gc_th->fggc_wq);
+ kfree(gc_th);
+ sbi->gc_thread = NULL;
+}
+
+static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
+{
+ int gc_mode;
+
+ if (gc_type == BG_GC) {
+ if (sbi->am.atgc_enabled)
+ gc_mode = GC_AT;
+ else
+ gc_mode = GC_CB;
+ } else {
+ gc_mode = GC_GREEDY;
+ }
+
+ switch (sbi->gc_mode) {
+ case GC_IDLE_CB:
+ gc_mode = GC_CB;
+ break;
+ case GC_IDLE_GREEDY:
+ case GC_URGENT_HIGH:
+ gc_mode = GC_GREEDY;
+ break;
+ case GC_IDLE_AT:
+ gc_mode = GC_AT;
+ break;
+ }
+
+ return gc_mode;
+}
+
+static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
+ int type, struct victim_sel_policy *p)
+{
+ struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
+
+ if (p->alloc_mode == SSR) {
+ p->gc_mode = GC_GREEDY;
+ p->dirty_bitmap = dirty_i->dirty_segmap[type];
+ p->max_search = dirty_i->nr_dirty[type];
+ p->ofs_unit = 1;
+ } else if (p->alloc_mode == AT_SSR) {
+ p->gc_mode = GC_GREEDY;
+ p->dirty_bitmap = dirty_i->dirty_segmap[type];
+ p->max_search = dirty_i->nr_dirty[type];
+ p->ofs_unit = 1;
+ } else {
+ p->gc_mode = select_gc_type(sbi, gc_type);
+ p->ofs_unit = sbi->segs_per_sec;
+ if (__is_large_section(sbi)) {
+ p->dirty_bitmap = dirty_i->dirty_secmap;
+ p->max_search = count_bits(p->dirty_bitmap,
+ 0, MAIN_SECS(sbi));
+ } else {
+ p->dirty_bitmap = dirty_i->dirty_segmap[DIRTY];
+ p->max_search = dirty_i->nr_dirty[DIRTY];
+ }
+ }
+
+ /*
+ * adjust candidates range, should select all dirty segments for
+ * foreground GC and urgent GC cases.
+ */
+ if (gc_type != FG_GC &&
+ (sbi->gc_mode != GC_URGENT_HIGH) &&
+ (p->gc_mode != GC_AT && p->alloc_mode != AT_SSR) &&
+ p->max_search > sbi->max_victim_search)
+ p->max_search = sbi->max_victim_search;
+
+ /* let's select beginning hot/small space first in no_heap mode*/
+ if (f2fs_need_rand_seg(sbi))
+ p->offset = prandom_u32_max(MAIN_SECS(sbi) * sbi->segs_per_sec);
+ else if (test_opt(sbi, NOHEAP) &&
+ (type == CURSEG_HOT_DATA || IS_NODESEG(type)))
+ p->offset = 0;
+ else
+ p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
+}
+
+static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
+ struct victim_sel_policy *p)
+{
+ /* SSR allocates in a segment unit */
+ if (p->alloc_mode == SSR)
+ return sbi->blocks_per_seg;
+ else if (p->alloc_mode == AT_SSR)
+ return UINT_MAX;
+
+ /* LFS */
+ if (p->gc_mode == GC_GREEDY)
+ return 2 * sbi->blocks_per_seg * p->ofs_unit;
+ else if (p->gc_mode == GC_CB)
+ return UINT_MAX;
+ else if (p->gc_mode == GC_AT)
+ return UINT_MAX;
+ else /* No other gc_mode */
+ return 0;
+}
+
+static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
+{
+ struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
+ unsigned int secno;
+
+ /*
+ * If the gc_type is FG_GC, we can select victim segments
+ * selected by background GC before.
+ * Those segments guarantee they have small valid blocks.
+ */
+ for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
+ if (sec_usage_check(sbi, secno))
+ continue;
+ clear_bit(secno, dirty_i->victim_secmap);
+ return GET_SEG_FROM_SEC(sbi, secno);
+ }
+ return NULL_SEGNO;
+}
+
+static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
+ unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
+ unsigned long long mtime = 0;
+ unsigned int vblocks;
+ unsigned char age = 0;
+ unsigned char u;
+ unsigned int i;
+ unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi, segno);
+
+ for (i = 0; i < usable_segs_per_sec; i++)
+ mtime += get_seg_entry(sbi, start + i)->mtime;
+ vblocks = get_valid_blocks(sbi, segno, true);
+
+ mtime = div_u64(mtime, usable_segs_per_sec);
+ vblocks = div_u64(vblocks, usable_segs_per_sec);
+
+ u = (vblocks * 100) >> sbi->log_blocks_per_seg;
+
+ /* Handle if the system time has changed by the user */
+ if (mtime < sit_i->min_mtime)
+ sit_i->min_mtime = mtime;
+ if (mtime > sit_i->max_mtime)
+ sit_i->max_mtime = mtime;
+ if (sit_i->max_mtime != sit_i->min_mtime)
+ age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
+ sit_i->max_mtime - sit_i->min_mtime);
+
+ return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
+}
+
+static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
+ unsigned int segno, struct victim_sel_policy *p)
+{
+ if (p->alloc_mode == SSR)
+ return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
+
+ /* alloc_mode == LFS */
+ if (p->gc_mode == GC_GREEDY)
+ return get_valid_blocks(sbi, segno, true);
+ else if (p->gc_mode == GC_CB)
+ return get_cb_cost(sbi, segno);
+
+ f2fs_bug_on(sbi, 1);
+ return 0;
+}
+
+static unsigned int count_bits(const unsigned long *addr,
+ unsigned int offset, unsigned int len)
+{
+ unsigned int end = offset + len, sum = 0;
+
+ while (offset < end) {
+ if (test_bit(offset++, addr))
+ ++sum;
+ }
+ return sum;
+}
+
+static bool f2fs_check_victim_tree(struct f2fs_sb_info *sbi,
+ struct rb_root_cached *root)
+{
+#ifdef CONFIG_F2FS_CHECK_FS
+ struct rb_node *cur = rb_first_cached(root), *next;
+ struct victim_entry *cur_ve, *next_ve;
+
+ while (cur) {
+ next = rb_next(cur);
+ if (!next)
+ return true;
+
+ cur_ve = rb_entry(cur, struct victim_entry, rb_node);
+ next_ve = rb_entry(next, struct victim_entry, rb_node);
+
+ if (cur_ve->mtime > next_ve->mtime) {
+ f2fs_info(sbi, "broken victim_rbtree, "
+ "cur_mtime(%llu) next_mtime(%llu)",
+ cur_ve->mtime, next_ve->mtime);
+ return false;
+ }
+ cur = next;
+ }
+#endif
+ return true;
+}
+
+static struct victim_entry *__lookup_victim_entry(struct f2fs_sb_info *sbi,
+ unsigned long long mtime)
+{
+ struct atgc_management *am = &sbi->am;
+ struct rb_node *node = am->root.rb_root.rb_node;
+ struct victim_entry *ve = NULL;
+
+ while (node) {
+ ve = rb_entry(node, struct victim_entry, rb_node);
+
+ if (mtime < ve->mtime)
+ node = node->rb_left;
+ else
+ node = node->rb_right;
+ }
+ return ve;
+}
+
+static struct victim_entry *__create_victim_entry(struct f2fs_sb_info *sbi,
+ unsigned long long mtime, unsigned int segno)
+{
+ struct atgc_management *am = &sbi->am;
+ struct victim_entry *ve;
+
+ ve = f2fs_kmem_cache_alloc(victim_entry_slab, GFP_NOFS, true, NULL);
+
+ ve->mtime = mtime;
+ ve->segno = segno;
+
+ list_add_tail(&ve->list, &am->victim_list);
+ am->victim_count++;
+
+ return ve;
+}
+
+static void __insert_victim_entry(struct f2fs_sb_info *sbi,
+ unsigned long long mtime, unsigned int segno)
+{
+ struct atgc_management *am = &sbi->am;
+ struct rb_root_cached *root = &am->root;
+ struct rb_node **p = &root->rb_root.rb_node;
+ struct rb_node *parent = NULL;
+ struct victim_entry *ve;
+ bool left_most = true;
+
+ /* look up rb tree to find parent node */
+ while (*p) {
+ parent = *p;
+ ve = rb_entry(parent, struct victim_entry, rb_node);
+
+ if (mtime < ve->mtime) {
+ p = &(*p)->rb_left;
+ } else {
+ p = &(*p)->rb_right;
+ left_most = false;
+ }
+ }
+
+ ve = __create_victim_entry(sbi, mtime, segno);
+
+ rb_link_node(&ve->rb_node, parent, p);
+ rb_insert_color_cached(&ve->rb_node, root, left_most);
+}
+
+static void add_victim_entry(struct f2fs_sb_info *sbi,
+ struct victim_sel_policy *p, unsigned int segno)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
+ unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
+ unsigned long long mtime = 0;
+ unsigned int i;
+
+ if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
+ if (p->gc_mode == GC_AT &&
+ get_valid_blocks(sbi, segno, true) == 0)
+ return;
+ }
+
+ for (i = 0; i < sbi->segs_per_sec; i++)
+ mtime += get_seg_entry(sbi, start + i)->mtime;
+ mtime = div_u64(mtime, sbi->segs_per_sec);
+
+ /* Handle if the system time has changed by the user */
+ if (mtime < sit_i->min_mtime)
+ sit_i->min_mtime = mtime;
+ if (mtime > sit_i->max_mtime)
+ sit_i->max_mtime = mtime;
+ if (mtime < sit_i->dirty_min_mtime)
+ sit_i->dirty_min_mtime = mtime;
+ if (mtime > sit_i->dirty_max_mtime)
+ sit_i->dirty_max_mtime = mtime;
+
+ /* don't choose young section as candidate */
+ if (sit_i->dirty_max_mtime - mtime < p->age_threshold)
+ return;
+
+ __insert_victim_entry(sbi, mtime, segno);
+}
+
+static void atgc_lookup_victim(struct f2fs_sb_info *sbi,
+ struct victim_sel_policy *p)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ struct atgc_management *am = &sbi->am;
+ struct rb_root_cached *root = &am->root;
+ struct rb_node *node;
+ struct victim_entry *ve;
+ unsigned long long total_time;
+ unsigned long long age, u, accu;
+ unsigned long long max_mtime = sit_i->dirty_max_mtime;
+ unsigned long long min_mtime = sit_i->dirty_min_mtime;
+ unsigned int sec_blocks = CAP_BLKS_PER_SEC(sbi);
+ unsigned int vblocks;
+ unsigned int dirty_threshold = max(am->max_candidate_count,
+ am->candidate_ratio *
+ am->victim_count / 100);
+ unsigned int age_weight = am->age_weight;
+ unsigned int cost;
+ unsigned int iter = 0;
+
+ if (max_mtime < min_mtime)
+ return;
+
+ max_mtime += 1;
+ total_time = max_mtime - min_mtime;
+
+ accu = div64_u64(ULLONG_MAX, total_time);
+ accu = min_t(unsigned long long, div_u64(accu, 100),
+ DEFAULT_ACCURACY_CLASS);
+
+ node = rb_first_cached(root);
+next:
+ ve = rb_entry_safe(node, struct victim_entry, rb_node);
+ if (!ve)
+ return;
+
+ if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
+ goto skip;
+
+ /* age = 10000 * x% * 60 */
+ age = div64_u64(accu * (max_mtime - ve->mtime), total_time) *
+ age_weight;
+
+ vblocks = get_valid_blocks(sbi, ve->segno, true);
+ f2fs_bug_on(sbi, !vblocks || vblocks == sec_blocks);
+
+ /* u = 10000 * x% * 40 */
+ u = div64_u64(accu * (sec_blocks - vblocks), sec_blocks) *
+ (100 - age_weight);
+
+ f2fs_bug_on(sbi, age + u >= UINT_MAX);
+
+ cost = UINT_MAX - (age + u);
+ iter++;
+
+ if (cost < p->min_cost ||
+ (cost == p->min_cost && age > p->oldest_age)) {
+ p->min_cost = cost;
+ p->oldest_age = age;
+ p->min_segno = ve->segno;
+ }
+skip:
+ if (iter < dirty_threshold) {
+ node = rb_next(node);
+ goto next;
+ }
+}
+
+/*
+ * select candidates around source section in range of
+ * [target - dirty_threshold, target + dirty_threshold]
+ */
+static void atssr_lookup_victim(struct f2fs_sb_info *sbi,
+ struct victim_sel_policy *p)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ struct atgc_management *am = &sbi->am;
+ struct victim_entry *ve;
+ unsigned long long age;
+ unsigned long long max_mtime = sit_i->dirty_max_mtime;
+ unsigned long long min_mtime = sit_i->dirty_min_mtime;
+ unsigned int seg_blocks = sbi->blocks_per_seg;
+ unsigned int vblocks;
+ unsigned int dirty_threshold = max(am->max_candidate_count,
+ am->candidate_ratio *
+ am->victim_count / 100);
+ unsigned int cost, iter;
+ int stage = 0;
+
+ if (max_mtime < min_mtime)
+ return;
+ max_mtime += 1;
+next_stage:
+ iter = 0;
+ ve = __lookup_victim_entry(sbi, p->age);
+next_node:
+ if (!ve) {
+ if (stage++ == 0)
+ goto next_stage;
+ return;
+ }
+
+ if (ve->mtime >= max_mtime || ve->mtime < min_mtime)
+ goto skip_node;
+
+ age = max_mtime - ve->mtime;
+
+ vblocks = get_seg_entry(sbi, ve->segno)->ckpt_valid_blocks;
+ f2fs_bug_on(sbi, !vblocks);
+
+ /* rare case */
+ if (vblocks == seg_blocks)
+ goto skip_node;
+
+ iter++;
+
+ age = max_mtime - abs(p->age - age);
+ cost = UINT_MAX - vblocks;
+
+ if (cost < p->min_cost ||
+ (cost == p->min_cost && age > p->oldest_age)) {
+ p->min_cost = cost;
+ p->oldest_age = age;
+ p->min_segno = ve->segno;
+ }
+skip_node:
+ if (iter < dirty_threshold) {
+ ve = rb_entry(stage == 0 ? rb_prev(&ve->rb_node) :
+ rb_next(&ve->rb_node),
+ struct victim_entry, rb_node);
+ goto next_node;
+ }
+
+ if (stage++ == 0)
+ goto next_stage;
+}
+
+static void lookup_victim_by_age(struct f2fs_sb_info *sbi,
+ struct victim_sel_policy *p)
+{
+ f2fs_bug_on(sbi, !f2fs_check_victim_tree(sbi, &sbi->am.root));
+
+ if (p->gc_mode == GC_AT)
+ atgc_lookup_victim(sbi, p);
+ else if (p->alloc_mode == AT_SSR)
+ atssr_lookup_victim(sbi, p);
+ else
+ f2fs_bug_on(sbi, 1);
+}
+
+static void release_victim_entry(struct f2fs_sb_info *sbi)
+{
+ struct atgc_management *am = &sbi->am;
+ struct victim_entry *ve, *tmp;
+
+ list_for_each_entry_safe(ve, tmp, &am->victim_list, list) {
+ list_del(&ve->list);
+ kmem_cache_free(victim_entry_slab, ve);
+ am->victim_count--;
+ }
+
+ am->root = RB_ROOT_CACHED;
+
+ f2fs_bug_on(sbi, am->victim_count);
+ f2fs_bug_on(sbi, !list_empty(&am->victim_list));
+}
+
+static bool f2fs_pin_section(struct f2fs_sb_info *sbi, unsigned int segno)
+{
+ struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
+ unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
+
+ if (!dirty_i->enable_pin_section)
+ return false;
+ if (!test_and_set_bit(secno, dirty_i->pinned_secmap))
+ dirty_i->pinned_secmap_cnt++;
+ return true;
+}
+
+static bool f2fs_pinned_section_exists(struct dirty_seglist_info *dirty_i)
+{
+ return dirty_i->pinned_secmap_cnt;
+}
+
+static bool f2fs_section_is_pinned(struct dirty_seglist_info *dirty_i,
+ unsigned int secno)
+{
+ return dirty_i->enable_pin_section &&
+ f2fs_pinned_section_exists(dirty_i) &&
+ test_bit(secno, dirty_i->pinned_secmap);
+}
+
+static void f2fs_unpin_all_sections(struct f2fs_sb_info *sbi, bool enable)
+{
+ unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
+
+ if (f2fs_pinned_section_exists(DIRTY_I(sbi))) {
+ memset(DIRTY_I(sbi)->pinned_secmap, 0, bitmap_size);
+ DIRTY_I(sbi)->pinned_secmap_cnt = 0;
+ }
+ DIRTY_I(sbi)->enable_pin_section = enable;
+}
+
+static int f2fs_gc_pinned_control(struct inode *inode, int gc_type,
+ unsigned int segno)
+{
+ if (!f2fs_is_pinned_file(inode))
+ return 0;
+ if (gc_type != FG_GC)
+ return -EBUSY;
+ if (!f2fs_pin_section(F2FS_I_SB(inode), segno))
+ f2fs_pin_file_control(inode, true);
+ return -EAGAIN;
+}
+
+/*
+ * This function is called from two paths.
+ * One is garbage collection and the other is SSR segment selection.
+ * When it is called during GC, it just gets a victim segment
+ * and it does not remove it from dirty seglist.
+ * When it is called from SSR segment selection, it finds a segment
+ * which has minimum valid blocks and removes it from dirty seglist.
+ */
+static int get_victim_by_default(struct f2fs_sb_info *sbi,
+ unsigned int *result, int gc_type, int type,
+ char alloc_mode, unsigned long long age)
+{
+ struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
+ struct sit_info *sm = SIT_I(sbi);
+ struct victim_sel_policy p;
+ unsigned int secno, last_victim;
+ unsigned int last_segment;
+ unsigned int nsearched;
+ bool is_atgc;
+ int ret = 0;
+
+ mutex_lock(&dirty_i->seglist_lock);
+ last_segment = MAIN_SECS(sbi) * sbi->segs_per_sec;
+
+ p.alloc_mode = alloc_mode;
+ p.age = age;
+ p.age_threshold = sbi->am.age_threshold;
+
+retry:
+ select_policy(sbi, gc_type, type, &p);
+ p.min_segno = NULL_SEGNO;
+ p.oldest_age = 0;
+ p.min_cost = get_max_cost(sbi, &p);
+
+ is_atgc = (p.gc_mode == GC_AT || p.alloc_mode == AT_SSR);
+ nsearched = 0;
+
+ if (is_atgc)
+ SIT_I(sbi)->dirty_min_mtime = ULLONG_MAX;
+
+ if (*result != NULL_SEGNO) {
+ if (!get_valid_blocks(sbi, *result, false)) {
+ ret = -ENODATA;
+ goto out;
+ }
+
+ if (sec_usage_check(sbi, GET_SEC_FROM_SEG(sbi, *result)))
+ ret = -EBUSY;
+ else
+ p.min_segno = *result;
+ goto out;
+ }
+
+ ret = -ENODATA;
+ if (p.max_search == 0)
+ goto out;
+
+ if (__is_large_section(sbi) && p.alloc_mode == LFS) {
+ if (sbi->next_victim_seg[BG_GC] != NULL_SEGNO) {
+ p.min_segno = sbi->next_victim_seg[BG_GC];
+ *result = p.min_segno;
+ sbi->next_victim_seg[BG_GC] = NULL_SEGNO;
+ goto got_result;
+ }
+ if (gc_type == FG_GC &&
+ sbi->next_victim_seg[FG_GC] != NULL_SEGNO) {
+ p.min_segno = sbi->next_victim_seg[FG_GC];
+ *result = p.min_segno;
+ sbi->next_victim_seg[FG_GC] = NULL_SEGNO;
+ goto got_result;
+ }
+ }
+
+ last_victim = sm->last_victim[p.gc_mode];
+ if (p.alloc_mode == LFS && gc_type == FG_GC) {
+ p.min_segno = check_bg_victims(sbi);
+ if (p.min_segno != NULL_SEGNO)
+ goto got_it;
+ }
+
+ while (1) {
+ unsigned long cost, *dirty_bitmap;
+ unsigned int unit_no, segno;
+
+ dirty_bitmap = p.dirty_bitmap;
+ unit_no = find_next_bit(dirty_bitmap,
+ last_segment / p.ofs_unit,
+ p.offset / p.ofs_unit);
+ segno = unit_no * p.ofs_unit;
+ if (segno >= last_segment) {
+ if (sm->last_victim[p.gc_mode]) {
+ last_segment =
+ sm->last_victim[p.gc_mode];
+ sm->last_victim[p.gc_mode] = 0;
+ p.offset = 0;
+ continue;
+ }
+ break;
+ }
+
+ p.offset = segno + p.ofs_unit;
+ nsearched++;
+
+#ifdef CONFIG_F2FS_CHECK_FS
+ /*
+ * skip selecting the invalid segno (that is failed due to block
+ * validity check failure during GC) to avoid endless GC loop in
+ * such cases.
+ */
+ if (test_bit(segno, sm->invalid_segmap))
+ goto next;
+#endif
+
+ secno = GET_SEC_FROM_SEG(sbi, segno);
+
+ if (sec_usage_check(sbi, secno))
+ goto next;
+
+ /* Don't touch checkpointed data */
+ if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
+ if (p.alloc_mode == LFS) {
+ /*
+ * LFS is set to find source section during GC.
+ * The victim should have no checkpointed data.
+ */
+ if (get_ckpt_valid_blocks(sbi, segno, true))
+ goto next;
+ } else {
+ /*
+ * SSR | AT_SSR are set to find target segment
+ * for writes which can be full by checkpointed
+ * and newly written blocks.
+ */
+ if (!f2fs_segment_has_free_slot(sbi, segno))
+ goto next;
+ }
+ }
+
+ if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
+ goto next;
+
+ if (gc_type == FG_GC && f2fs_section_is_pinned(dirty_i, secno))
+ goto next;
+
+ if (is_atgc) {
+ add_victim_entry(sbi, &p, segno);
+ goto next;
+ }
+
+ cost = get_gc_cost(sbi, segno, &p);
+
+ if (p.min_cost > cost) {
+ p.min_segno = segno;
+ p.min_cost = cost;
+ }
+next:
+ if (nsearched >= p.max_search) {
+ if (!sm->last_victim[p.gc_mode] && segno <= last_victim)
+ sm->last_victim[p.gc_mode] =
+ last_victim + p.ofs_unit;
+ else
+ sm->last_victim[p.gc_mode] = segno + p.ofs_unit;
+ sm->last_victim[p.gc_mode] %=
+ (MAIN_SECS(sbi) * sbi->segs_per_sec);
+ break;
+ }
+ }
+
+ /* get victim for GC_AT/AT_SSR */
+ if (is_atgc) {
+ lookup_victim_by_age(sbi, &p);
+ release_victim_entry(sbi);
+ }
+
+ if (is_atgc && p.min_segno == NULL_SEGNO &&
+ sm->elapsed_time < p.age_threshold) {
+ p.age_threshold = 0;
+ goto retry;
+ }
+
+ if (p.min_segno != NULL_SEGNO) {
+got_it:
+ *result = (p.min_segno / p.ofs_unit) * p.ofs_unit;
+got_result:
+ if (p.alloc_mode == LFS) {
+ secno = GET_SEC_FROM_SEG(sbi, p.min_segno);
+ if (gc_type == FG_GC)
+ sbi->cur_victim_sec = secno;
+ else
+ set_bit(secno, dirty_i->victim_secmap);
+ }
+ ret = 0;
+
+ }
+out:
+ if (p.min_segno != NULL_SEGNO)
+ trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
+ sbi->cur_victim_sec,
+ prefree_segments(sbi), free_segments(sbi));
+ mutex_unlock(&dirty_i->seglist_lock);
+
+ return ret;
+}
+
+static const struct victim_selection default_v_ops = {
+ .get_victim = get_victim_by_default,
+};
+
+static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
+{
+ struct inode_entry *ie;
+
+ ie = radix_tree_lookup(&gc_list->iroot, ino);
+ if (ie)
+ return ie->inode;
+ return NULL;
+}
+
+static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
+{
+ struct inode_entry *new_ie;
+
+ if (inode == find_gc_inode(gc_list, inode->i_ino)) {
+ iput(inode);
+ return;
+ }
+ new_ie = f2fs_kmem_cache_alloc(f2fs_inode_entry_slab,
+ GFP_NOFS, true, NULL);
+ new_ie->inode = inode;
+
+ f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
+ list_add_tail(&new_ie->list, &gc_list->ilist);
+}
+
+static void put_gc_inode(struct gc_inode_list *gc_list)
+{
+ struct inode_entry *ie, *next_ie;
+
+ list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
+ radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
+ iput(ie->inode);
+ list_del(&ie->list);
+ kmem_cache_free(f2fs_inode_entry_slab, ie);
+ }
+}
+
+static int check_valid_map(struct f2fs_sb_info *sbi,
+ unsigned int segno, int offset)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ struct seg_entry *sentry;
+ int ret;
+
+ down_read(&sit_i->sentry_lock);
+ sentry = get_seg_entry(sbi, segno);
+ ret = f2fs_test_bit(offset, sentry->cur_valid_map);
+ up_read(&sit_i->sentry_lock);
+ return ret;
+}
+
+/*
+ * This function compares node address got in summary with that in NAT.
+ * On validity, copy that node with cold status, otherwise (invalid node)
+ * ignore that.
+ */
+static int gc_node_segment(struct f2fs_sb_info *sbi,
+ struct f2fs_summary *sum, unsigned int segno, int gc_type)
+{
+ struct f2fs_summary *entry;
+ block_t start_addr;
+ int off;
+ int phase = 0;
+ bool fggc = (gc_type == FG_GC);
+ int submitted = 0;
+ unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
+
+ start_addr = START_BLOCK(sbi, segno);
+
+next_step:
+ entry = sum;
+
+ if (fggc && phase == 2)
+ atomic_inc(&sbi->wb_sync_req[NODE]);
+
+ for (off = 0; off < usable_blks_in_seg; off++, entry++) {
+ nid_t nid = le32_to_cpu(entry->nid);
+ struct page *node_page;
+ struct node_info ni;
+ int err;
+
+ /* stop BG_GC if there is not enough free sections. */
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
+ return submitted;
+
+ if (check_valid_map(sbi, segno, off) == 0)
+ continue;
+
+ if (phase == 0) {
+ f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
+ META_NAT, true);
+ continue;
+ }
+
+ if (phase == 1) {
+ f2fs_ra_node_page(sbi, nid);
+ continue;
+ }
+
+ /* phase == 2 */
+ node_page = f2fs_get_node_page(sbi, nid);
+ if (IS_ERR(node_page))
+ continue;
+
+ /* block may become invalid during f2fs_get_node_page */
+ if (check_valid_map(sbi, segno, off) == 0) {
+ f2fs_put_page(node_page, 1);
+ continue;
+ }
+
+ if (f2fs_get_node_info(sbi, nid, &ni, false)) {
+ f2fs_put_page(node_page, 1);
+ continue;
+ }
+
+ if (ni.blk_addr != start_addr + off) {
+ f2fs_put_page(node_page, 1);
+ continue;
+ }
+
+ err = f2fs_move_node_page(node_page, gc_type);
+ if (!err && gc_type == FG_GC)
+ submitted++;
+ stat_inc_node_blk_count(sbi, 1, gc_type);
+ }
+
+ if (++phase < 3)
+ goto next_step;
+
+ if (fggc)
+ atomic_dec(&sbi->wb_sync_req[NODE]);
+ return submitted;
+}
+
+/*
+ * Calculate start block index indicating the given node offset.
+ * Be careful, caller should give this node offset only indicating direct node
+ * blocks. If any node offsets, which point the other types of node blocks such
+ * as indirect or double indirect node blocks, are given, it must be a caller's
+ * bug.
+ */
+block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
+{
+ unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
+ unsigned int bidx;
+
+ if (node_ofs == 0)
+ return 0;
+
+ if (node_ofs <= 2) {
+ bidx = node_ofs - 1;
+ } else if (node_ofs <= indirect_blks) {
+ int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
+
+ bidx = node_ofs - 2 - dec;
+ } else {
+ int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
+
+ bidx = node_ofs - 5 - dec;
+ }
+ return bidx * ADDRS_PER_BLOCK(inode) + ADDRS_PER_INODE(inode);
+}
+
+static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
+ struct node_info *dni, block_t blkaddr, unsigned int *nofs)
+{
+ struct page *node_page;
+ nid_t nid;
+ unsigned int ofs_in_node, max_addrs, base;
+ block_t source_blkaddr;
+
+ nid = le32_to_cpu(sum->nid);
+ ofs_in_node = le16_to_cpu(sum->ofs_in_node);
+
+ node_page = f2fs_get_node_page(sbi, nid);
+ if (IS_ERR(node_page))
+ return false;
+
+ if (f2fs_get_node_info(sbi, nid, dni, false)) {
+ f2fs_put_page(node_page, 1);
+ return false;
+ }
+
+ if (sum->version != dni->version) {
+ f2fs_warn(sbi, "%s: valid data with mismatched node version.",
+ __func__);
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ }
+
+ if (f2fs_check_nid_range(sbi, dni->ino)) {
+ f2fs_put_page(node_page, 1);
+ return false;
+ }
+
+ if (IS_INODE(node_page)) {
+ base = offset_in_addr(F2FS_INODE(node_page));
+ max_addrs = DEF_ADDRS_PER_INODE;
+ } else {
+ base = 0;
+ max_addrs = DEF_ADDRS_PER_BLOCK;
+ }
+
+ if (base + ofs_in_node >= max_addrs) {
+ f2fs_err(sbi, "Inconsistent blkaddr offset: base:%u, ofs_in_node:%u, max:%u, ino:%u, nid:%u",
+ base, ofs_in_node, max_addrs, dni->ino, dni->nid);
+ f2fs_put_page(node_page, 1);
+ return false;
+ }
+
+ *nofs = ofs_of_node(node_page);
+ source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
+ f2fs_put_page(node_page, 1);
+
+ if (source_blkaddr != blkaddr) {
+#ifdef CONFIG_F2FS_CHECK_FS
+ unsigned int segno = GET_SEGNO(sbi, blkaddr);
+ unsigned long offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
+
+ if (unlikely(check_valid_map(sbi, segno, offset))) {
+ if (!test_and_set_bit(segno, SIT_I(sbi)->invalid_segmap)) {
+ f2fs_err(sbi, "mismatched blkaddr %u (source_blkaddr %u) in seg %u",
+ blkaddr, source_blkaddr, segno);
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ }
+ }
+#endif
+ return false;
+ }
+ return true;
+}
+
+static int ra_data_block(struct inode *inode, pgoff_t index)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct address_space *mapping = inode->i_mapping;
+ struct dnode_of_data dn;
+ struct page *page;
+ struct extent_info ei = {0, };
+ struct f2fs_io_info fio = {
+ .sbi = sbi,
+ .ino = inode->i_ino,
+ .type = DATA,
+ .temp = COLD,
+ .op = REQ_OP_READ,
+ .op_flags = 0,
+ .encrypted_page = NULL,
+ .in_list = false,
+ .retry = false,
+ };
+ int err;
+
+ page = f2fs_grab_cache_page(mapping, index, true);
+ if (!page)
+ return -ENOMEM;
+
+ if (f2fs_lookup_read_extent_cache(inode, index, &ei)) {
+ dn.data_blkaddr = ei.blk + index - ei.fofs;
+ if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
+ DATA_GENERIC_ENHANCE_READ))) {
+ err = -EFSCORRUPTED;
+ f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
+ goto put_page;
+ }
+ goto got_it;
+ }
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+ err = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE);
+ if (err)
+ goto put_page;
+ f2fs_put_dnode(&dn);
+
+ if (!__is_valid_data_blkaddr(dn.data_blkaddr)) {
+ err = -ENOENT;
+ goto put_page;
+ }
+ if (unlikely(!f2fs_is_valid_blkaddr(sbi, dn.data_blkaddr,
+ DATA_GENERIC_ENHANCE))) {
+ err = -EFSCORRUPTED;
+ f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
+ goto put_page;
+ }
+got_it:
+ /* read page */
+ fio.page = page;
+ fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
+
+ /*
+ * don't cache encrypted data into meta inode until previous dirty
+ * data were writebacked to avoid racing between GC and flush.
+ */
+ f2fs_wait_on_page_writeback(page, DATA, true, true);
+
+ f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
+
+ fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(sbi),
+ dn.data_blkaddr,
+ FGP_LOCK | FGP_CREAT, GFP_NOFS);
+ if (!fio.encrypted_page) {
+ err = -ENOMEM;
+ goto put_page;
+ }
+
+ err = f2fs_submit_page_bio(&fio);
+ if (err)
+ goto put_encrypted_page;
+ f2fs_put_page(fio.encrypted_page, 0);
+ f2fs_put_page(page, 1);
+
+ f2fs_update_iostat(sbi, inode, FS_DATA_READ_IO, F2FS_BLKSIZE);
+ f2fs_update_iostat(sbi, NULL, FS_GDATA_READ_IO, F2FS_BLKSIZE);
+
+ return 0;
+put_encrypted_page:
+ f2fs_put_page(fio.encrypted_page, 1);
+put_page:
+ f2fs_put_page(page, 1);
+ return err;
+}
+
+/*
+ * Move data block via META_MAPPING while keeping locked data page.
+ * This can be used to move blocks, aka LBAs, directly on disk.
+ */
+static int move_data_block(struct inode *inode, block_t bidx,
+ int gc_type, unsigned int segno, int off)
+{
+ struct f2fs_io_info fio = {
+ .sbi = F2FS_I_SB(inode),
+ .ino = inode->i_ino,
+ .type = DATA,
+ .temp = COLD,
+ .op = REQ_OP_READ,
+ .op_flags = 0,
+ .encrypted_page = NULL,
+ .in_list = false,
+ .retry = false,
+ };
+ struct dnode_of_data dn;
+ struct f2fs_summary sum;
+ struct node_info ni;
+ struct page *page, *mpage;
+ block_t newaddr;
+ int err = 0;
+ bool lfs_mode = f2fs_lfs_mode(fio.sbi);
+ int type = fio.sbi->am.atgc_enabled && (gc_type == BG_GC) &&
+ (fio.sbi->gc_mode != GC_URGENT_HIGH) ?
+ CURSEG_ALL_DATA_ATGC : CURSEG_COLD_DATA;
+
+ /* do not read out */
+ page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
+ if (!page)
+ return -ENOMEM;
+
+ if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ err = f2fs_gc_pinned_control(inode, gc_type, segno);
+ if (err)
+ goto out;
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+ err = f2fs_get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
+ if (err)
+ goto out;
+
+ if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
+ ClearPageUptodate(page);
+ err = -ENOENT;
+ goto put_out;
+ }
+
+ /*
+ * don't cache encrypted data into meta inode until previous dirty
+ * data were writebacked to avoid racing between GC and flush.
+ */
+ f2fs_wait_on_page_writeback(page, DATA, true, true);
+
+ f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
+
+ err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
+ if (err)
+ goto put_out;
+
+ /* read page */
+ fio.page = page;
+ fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
+
+ if (lfs_mode)
+ f2fs_down_write(&fio.sbi->io_order_lock);
+
+ mpage = f2fs_grab_cache_page(META_MAPPING(fio.sbi),
+ fio.old_blkaddr, false);
+ if (!mpage) {
+ err = -ENOMEM;
+ goto up_out;
+ }
+
+ fio.encrypted_page = mpage;
+
+ /* read source block in mpage */
+ if (!PageUptodate(mpage)) {
+ err = f2fs_submit_page_bio(&fio);
+ if (err) {
+ f2fs_put_page(mpage, 1);
+ goto up_out;
+ }
+
+ f2fs_update_iostat(fio.sbi, inode, FS_DATA_READ_IO,
+ F2FS_BLKSIZE);
+ f2fs_update_iostat(fio.sbi, NULL, FS_GDATA_READ_IO,
+ F2FS_BLKSIZE);
+
+ lock_page(mpage);
+ if (unlikely(mpage->mapping != META_MAPPING(fio.sbi) ||
+ !PageUptodate(mpage))) {
+ err = -EIO;
+ f2fs_put_page(mpage, 1);
+ goto up_out;
+ }
+ }
+
+ set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
+
+ /* allocate block address */
+ f2fs_allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
+ &sum, type, NULL);
+
+ fio.encrypted_page = f2fs_pagecache_get_page(META_MAPPING(fio.sbi),
+ newaddr, FGP_LOCK | FGP_CREAT, GFP_NOFS);
+ if (!fio.encrypted_page) {
+ err = -ENOMEM;
+ f2fs_put_page(mpage, 1);
+ goto recover_block;
+ }
+
+ /* write target block */
+ f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true, true);
+ memcpy(page_address(fio.encrypted_page),
+ page_address(mpage), PAGE_SIZE);
+ f2fs_put_page(mpage, 1);
+ invalidate_mapping_pages(META_MAPPING(fio.sbi),
+ fio.old_blkaddr, fio.old_blkaddr);
+ f2fs_invalidate_compress_page(fio.sbi, fio.old_blkaddr);
+
+ set_page_dirty(fio.encrypted_page);
+ if (clear_page_dirty_for_io(fio.encrypted_page))
+ dec_page_count(fio.sbi, F2FS_DIRTY_META);
+
+ set_page_writeback(fio.encrypted_page);
+ ClearPageError(page);
+
+ fio.op = REQ_OP_WRITE;
+ fio.op_flags = REQ_SYNC;
+ fio.new_blkaddr = newaddr;
+ f2fs_submit_page_write(&fio);
+ if (fio.retry) {
+ err = -EAGAIN;
+ if (PageWriteback(fio.encrypted_page))
+ end_page_writeback(fio.encrypted_page);
+ goto put_page_out;
+ }
+
+ f2fs_update_iostat(fio.sbi, NULL, FS_GC_DATA_IO, F2FS_BLKSIZE);
+
+ f2fs_update_data_blkaddr(&dn, newaddr);
+ set_inode_flag(inode, FI_APPEND_WRITE);
+ if (page->index == 0)
+ set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
+put_page_out:
+ f2fs_put_page(fio.encrypted_page, 1);
+recover_block:
+ if (err)
+ f2fs_do_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,
+ true, true, true);
+up_out:
+ if (lfs_mode)
+ f2fs_up_write(&fio.sbi->io_order_lock);
+put_out:
+ f2fs_put_dnode(&dn);
+out:
+ f2fs_put_page(page, 1);
+ return err;
+}
+
+static int move_data_page(struct inode *inode, block_t bidx, int gc_type,
+ unsigned int segno, int off)
+{
+ struct page *page;
+ int err = 0;
+
+ page = f2fs_get_lock_data_page(inode, bidx, true);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ err = f2fs_gc_pinned_control(inode, gc_type, segno);
+ if (err)
+ goto out;
+
+ if (gc_type == BG_GC) {
+ if (PageWriteback(page)) {
+ err = -EAGAIN;
+ goto out;
+ }
+ set_page_dirty(page);
+ set_page_private_gcing(page);
+ } else {
+ struct f2fs_io_info fio = {
+ .sbi = F2FS_I_SB(inode),
+ .ino = inode->i_ino,
+ .type = DATA,
+ .temp = COLD,
+ .op = REQ_OP_WRITE,
+ .op_flags = REQ_SYNC,
+ .old_blkaddr = NULL_ADDR,
+ .page = page,
+ .encrypted_page = NULL,
+ .need_lock = LOCK_REQ,
+ .io_type = FS_GC_DATA_IO,
+ };
+ bool is_dirty = PageDirty(page);
+
+retry:
+ f2fs_wait_on_page_writeback(page, DATA, true, true);
+
+ set_page_dirty(page);
+ if (clear_page_dirty_for_io(page)) {
+ inode_dec_dirty_pages(inode);
+ f2fs_remove_dirty_inode(inode);
+ }
+
+ set_page_private_gcing(page);
+
+ err = f2fs_do_write_data_page(&fio);
+ if (err) {
+ clear_page_private_gcing(page);
+ if (err == -ENOMEM) {
+ memalloc_retry_wait(GFP_NOFS);
+ goto retry;
+ }
+ if (is_dirty)
+ set_page_dirty(page);
+ }
+ }
+out:
+ f2fs_put_page(page, 1);
+ return err;
+}
+
+/*
+ * This function tries to get parent node of victim data block, and identifies
+ * data block validity. If the block is valid, copy that with cold status and
+ * modify parent node.
+ * If the parent node is not valid or the data block address is different,
+ * the victim data block is ignored.
+ */
+static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
+ struct gc_inode_list *gc_list, unsigned int segno, int gc_type,
+ bool force_migrate)
+{
+ struct super_block *sb = sbi->sb;
+ struct f2fs_summary *entry;
+ block_t start_addr;
+ int off;
+ int phase = 0;
+ int submitted = 0;
+ unsigned int usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
+
+ start_addr = START_BLOCK(sbi, segno);
+
+next_step:
+ entry = sum;
+
+ for (off = 0; off < usable_blks_in_seg; off++, entry++) {
+ struct page *data_page;
+ struct inode *inode;
+ struct node_info dni; /* dnode info for the data */
+ unsigned int ofs_in_node, nofs;
+ block_t start_bidx;
+ nid_t nid = le32_to_cpu(entry->nid);
+
+ /*
+ * stop BG_GC if there is not enough free sections.
+ * Or, stop GC if the segment becomes fully valid caused by
+ * race condition along with SSR block allocation.
+ */
+ if ((gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) ||
+ (!force_migrate && get_valid_blocks(sbi, segno, true) ==
+ CAP_BLKS_PER_SEC(sbi)))
+ return submitted;
+
+ if (check_valid_map(sbi, segno, off) == 0)
+ continue;
+
+ if (phase == 0) {
+ f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
+ META_NAT, true);
+ continue;
+ }
+
+ if (phase == 1) {
+ f2fs_ra_node_page(sbi, nid);
+ continue;
+ }
+
+ /* Get an inode by ino with checking validity */
+ if (!is_alive(sbi, entry, &dni, start_addr + off, &nofs))
+ continue;
+
+ if (phase == 2) {
+ f2fs_ra_node_page(sbi, dni.ino);
+ continue;
+ }
+
+ ofs_in_node = le16_to_cpu(entry->ofs_in_node);
+
+ if (phase == 3) {
+ int err;
+
+ inode = f2fs_iget(sb, dni.ino);
+ if (IS_ERR(inode) || is_bad_inode(inode) ||
+ special_file(inode->i_mode))
+ continue;
+
+ err = f2fs_gc_pinned_control(inode, gc_type, segno);
+ if (err == -EAGAIN) {
+ iput(inode);
+ return submitted;
+ }
+
+ if (!f2fs_down_write_trylock(
+ &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
+ iput(inode);
+ sbi->skipped_gc_rwsem++;
+ continue;
+ }
+
+ start_bidx = f2fs_start_bidx_of_node(nofs, inode) +
+ ofs_in_node;
+
+ if (f2fs_post_read_required(inode)) {
+ int err = ra_data_block(inode, start_bidx);
+
+ f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ if (err) {
+ iput(inode);
+ continue;
+ }
+ add_gc_inode(gc_list, inode);
+ continue;
+ }
+
+ data_page = f2fs_get_read_data_page(inode, start_bidx,
+ REQ_RAHEAD, true, NULL);
+ f2fs_up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ if (IS_ERR(data_page)) {
+ iput(inode);
+ continue;
+ }
+
+ f2fs_put_page(data_page, 0);
+ add_gc_inode(gc_list, inode);
+ continue;
+ }
+
+ /* phase 4 */
+ inode = find_gc_inode(gc_list, dni.ino);
+ if (inode) {
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ bool locked = false;
+ int err;
+
+ if (S_ISREG(inode->i_mode)) {
+ if (!f2fs_down_write_trylock(&fi->i_gc_rwsem[READ])) {
+ sbi->skipped_gc_rwsem++;
+ continue;
+ }
+ if (!f2fs_down_write_trylock(
+ &fi->i_gc_rwsem[WRITE])) {
+ sbi->skipped_gc_rwsem++;
+ f2fs_up_write(&fi->i_gc_rwsem[READ]);
+ continue;
+ }
+ locked = true;
+
+ /* wait for all inflight aio data */
+ inode_dio_wait(inode);
+ }
+
+ start_bidx = f2fs_start_bidx_of_node(nofs, inode)
+ + ofs_in_node;
+ if (f2fs_post_read_required(inode))
+ err = move_data_block(inode, start_bidx,
+ gc_type, segno, off);
+ else
+ err = move_data_page(inode, start_bidx, gc_type,
+ segno, off);
+
+ if (!err && (gc_type == FG_GC ||
+ f2fs_post_read_required(inode)))
+ submitted++;
+
+ if (locked) {
+ f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
+ f2fs_up_write(&fi->i_gc_rwsem[READ]);
+ }
+
+ stat_inc_data_blk_count(sbi, 1, gc_type);
+ }
+ }
+
+ if (++phase < 5)
+ goto next_step;
+
+ return submitted;
+}
+
+static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
+ int gc_type)
+{
+ struct sit_info *sit_i = SIT_I(sbi);
+ int ret;
+
+ down_write(&sit_i->sentry_lock);
+ ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
+ NO_CHECK_TYPE, LFS, 0);
+ up_write(&sit_i->sentry_lock);
+ return ret;
+}
+
+static int do_garbage_collect(struct f2fs_sb_info *sbi,
+ unsigned int start_segno,
+ struct gc_inode_list *gc_list, int gc_type,
+ bool force_migrate)
+{
+ struct page *sum_page;
+ struct f2fs_summary_block *sum;
+ struct blk_plug plug;
+ unsigned int segno = start_segno;
+ unsigned int end_segno = start_segno + sbi->segs_per_sec;
+ int seg_freed = 0, migrated = 0;
+ unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
+ SUM_TYPE_DATA : SUM_TYPE_NODE;
+ int submitted = 0;
+
+ if (__is_large_section(sbi))
+ end_segno = rounddown(end_segno, sbi->segs_per_sec);
+
+ /*
+ * zone-capacity can be less than zone-size in zoned devices,
+ * resulting in less than expected usable segments in the zone,
+ * calculate the end segno in the zone which can be garbage collected
+ */
+ if (f2fs_sb_has_blkzoned(sbi))
+ end_segno -= sbi->segs_per_sec -
+ f2fs_usable_segs_in_sec(sbi, segno);
+
+ sanity_check_seg_type(sbi, get_seg_entry(sbi, segno)->type);
+
+ /* readahead multi ssa blocks those have contiguous address */
+ if (__is_large_section(sbi))
+ f2fs_ra_meta_pages(sbi, GET_SUM_BLOCK(sbi, segno),
+ end_segno - segno, META_SSA, true);
+
+ /* reference all summary page */
+ while (segno < end_segno) {
+ sum_page = f2fs_get_sum_page(sbi, segno++);
+ if (IS_ERR(sum_page)) {
+ int err = PTR_ERR(sum_page);
+
+ end_segno = segno - 1;
+ for (segno = start_segno; segno < end_segno; segno++) {
+ sum_page = find_get_page(META_MAPPING(sbi),
+ GET_SUM_BLOCK(sbi, segno));
+ f2fs_put_page(sum_page, 0);
+ f2fs_put_page(sum_page, 0);
+ }
+ return err;
+ }
+ unlock_page(sum_page);
+ }
+
+ blk_start_plug(&plug);
+
+ for (segno = start_segno; segno < end_segno; segno++) {
+
+ /* find segment summary of victim */
+ sum_page = find_get_page(META_MAPPING(sbi),
+ GET_SUM_BLOCK(sbi, segno));
+ f2fs_put_page(sum_page, 0);
+
+ if (get_valid_blocks(sbi, segno, false) == 0)
+ goto freed;
+ if (gc_type == BG_GC && __is_large_section(sbi) &&
+ migrated >= sbi->migration_granularity)
+ goto skip;
+ if (!PageUptodate(sum_page) || unlikely(f2fs_cp_error(sbi)))
+ goto skip;
+
+ sum = page_address(sum_page);
+ if (type != GET_SUM_TYPE((&sum->footer))) {
+ f2fs_err(sbi, "Inconsistent segment (%u) type [%d, %d] in SSA and SIT",
+ segno, type, GET_SUM_TYPE((&sum->footer)));
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ f2fs_stop_checkpoint(sbi, false,
+ STOP_CP_REASON_CORRUPTED_SUMMARY);
+ goto skip;
+ }
+
+ /*
+ * this is to avoid deadlock:
+ * - lock_page(sum_page) - f2fs_replace_block
+ * - check_valid_map() - down_write(sentry_lock)
+ * - down_read(sentry_lock) - change_curseg()
+ * - lock_page(sum_page)
+ */
+ if (type == SUM_TYPE_NODE)
+ submitted += gc_node_segment(sbi, sum->entries, segno,
+ gc_type);
+ else
+ submitted += gc_data_segment(sbi, sum->entries, gc_list,
+ segno, gc_type,
+ force_migrate);
+
+ stat_inc_seg_count(sbi, type, gc_type);
+ sbi->gc_reclaimed_segs[sbi->gc_mode]++;
+ migrated++;
+
+freed:
+ if (gc_type == FG_GC &&
+ get_valid_blocks(sbi, segno, false) == 0)
+ seg_freed++;
+
+ if (__is_large_section(sbi))
+ sbi->next_victim_seg[gc_type] =
+ (segno + 1 < end_segno) ? segno + 1 : NULL_SEGNO;
+skip:
+ f2fs_put_page(sum_page, 0);
+ }
+
+ if (submitted)
+ f2fs_submit_merged_write(sbi,
+ (type == SUM_TYPE_NODE) ? NODE : DATA);
+
+ blk_finish_plug(&plug);
+
+ stat_inc_call_count(sbi->stat_info);
+
+ return seg_freed;
+}
+
+int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control)
+{
+ int gc_type = gc_control->init_gc_type;
+ unsigned int segno = gc_control->victim_segno;
+ int sec_freed = 0, seg_freed = 0, total_freed = 0;
+ int ret = 0;
+ struct cp_control cpc;
+ struct gc_inode_list gc_list = {
+ .ilist = LIST_HEAD_INIT(gc_list.ilist),
+ .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
+ };
+ unsigned int skipped_round = 0, round = 0;
+ unsigned int upper_secs;
+
+ trace_f2fs_gc_begin(sbi->sb, gc_type, gc_control->no_bg_gc,
+ gc_control->nr_free_secs,
+ get_pages(sbi, F2FS_DIRTY_NODES),
+ get_pages(sbi, F2FS_DIRTY_DENTS),
+ get_pages(sbi, F2FS_DIRTY_IMETA),
+ free_sections(sbi),
+ free_segments(sbi),
+ reserved_segments(sbi),
+ prefree_segments(sbi));
+
+ cpc.reason = __get_cp_reason(sbi);
+gc_more:
+ sbi->skipped_gc_rwsem = 0;
+ if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
+ ret = -EINVAL;
+ goto stop;
+ }
+ if (unlikely(f2fs_cp_error(sbi))) {
+ ret = -EIO;
+ goto stop;
+ }
+
+ if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0)) {
+ /*
+ * For example, if there are many prefree_segments below given
+ * threshold, we can make them free by checkpoint. Then, we
+ * secure free segments which doesn't need fggc any more.
+ */
+ if (prefree_segments(sbi)) {
+ ret = f2fs_write_checkpoint(sbi, &cpc);
+ if (ret)
+ goto stop;
+ }
+ if (has_not_enough_free_secs(sbi, 0, 0))
+ gc_type = FG_GC;
+ }
+
+ /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
+ if (gc_type == BG_GC && gc_control->no_bg_gc) {
+ ret = -EINVAL;
+ goto stop;
+ }
+retry:
+ ret = __get_victim(sbi, &segno, gc_type);
+ if (ret) {
+ /* allow to search victim from sections has pinned data */
+ if (ret == -ENODATA && gc_type == FG_GC &&
+ f2fs_pinned_section_exists(DIRTY_I(sbi))) {
+ f2fs_unpin_all_sections(sbi, false);
+ goto retry;
+ }
+ goto stop;
+ }
+
+ seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type,
+ gc_control->should_migrate_blocks);
+ total_freed += seg_freed;
+
+ if (seg_freed == f2fs_usable_segs_in_sec(sbi, segno))
+ sec_freed++;
+
+ if (gc_type == FG_GC)
+ sbi->cur_victim_sec = NULL_SEGNO;
+
+ if (gc_control->init_gc_type == FG_GC ||
+ !has_not_enough_free_secs(sbi,
+ (gc_type == FG_GC) ? sec_freed : 0, 0)) {
+ if (gc_type == FG_GC && sec_freed < gc_control->nr_free_secs)
+ goto go_gc_more;
+ goto stop;
+ }
+
+ /* FG_GC stops GC by skip_count */
+ if (gc_type == FG_GC) {
+ if (sbi->skipped_gc_rwsem)
+ skipped_round++;
+ round++;
+ if (skipped_round > MAX_SKIP_GC_COUNT &&
+ skipped_round * 2 >= round) {
+ ret = f2fs_write_checkpoint(sbi, &cpc);
+ goto stop;
+ }
+ }
+
+ __get_secs_required(sbi, NULL, &upper_secs, NULL);
+
+ /*
+ * Write checkpoint to reclaim prefree segments.
+ * We need more three extra sections for writer's data/node/dentry.
+ */
+ if (free_sections(sbi) <= upper_secs + NR_GC_CHECKPOINT_SECS &&
+ prefree_segments(sbi)) {
+ ret = f2fs_write_checkpoint(sbi, &cpc);
+ if (ret)
+ goto stop;
+ }
+go_gc_more:
+ segno = NULL_SEGNO;
+ goto gc_more;
+
+stop:
+ SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
+ SIT_I(sbi)->last_victim[FLUSH_DEVICE] = gc_control->victim_segno;
+
+ if (gc_type == FG_GC)
+ f2fs_unpin_all_sections(sbi, true);
+
+ trace_f2fs_gc_end(sbi->sb, ret, total_freed, sec_freed,
+ get_pages(sbi, F2FS_DIRTY_NODES),
+ get_pages(sbi, F2FS_DIRTY_DENTS),
+ get_pages(sbi, F2FS_DIRTY_IMETA),
+ free_sections(sbi),
+ free_segments(sbi),
+ reserved_segments(sbi),
+ prefree_segments(sbi));
+
+ f2fs_up_write(&sbi->gc_lock);
+
+ put_gc_inode(&gc_list);
+
+ if (gc_control->err_gc_skipped && !ret)
+ ret = sec_freed ? 0 : -EAGAIN;
+ return ret;
+}
+
+int __init f2fs_create_garbage_collection_cache(void)
+{
+ victim_entry_slab = f2fs_kmem_cache_create("f2fs_victim_entry",
+ sizeof(struct victim_entry));
+ if (!victim_entry_slab)
+ return -ENOMEM;
+ return 0;
+}
+
+void f2fs_destroy_garbage_collection_cache(void)
+{
+ kmem_cache_destroy(victim_entry_slab);
+}
+
+static void init_atgc_management(struct f2fs_sb_info *sbi)
+{
+ struct atgc_management *am = &sbi->am;
+
+ if (test_opt(sbi, ATGC) &&
+ SIT_I(sbi)->elapsed_time >= DEF_GC_THREAD_AGE_THRESHOLD)
+ am->atgc_enabled = true;
+
+ am->root = RB_ROOT_CACHED;
+ INIT_LIST_HEAD(&am->victim_list);
+ am->victim_count = 0;
+
+ am->candidate_ratio = DEF_GC_THREAD_CANDIDATE_RATIO;
+ am->max_candidate_count = DEF_GC_THREAD_MAX_CANDIDATE_COUNT;
+ am->age_weight = DEF_GC_THREAD_AGE_WEIGHT;
+ am->age_threshold = DEF_GC_THREAD_AGE_THRESHOLD;
+}
+
+void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
+{
+ DIRTY_I(sbi)->v_ops = &default_v_ops;
+
+ sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
+
+ /* give warm/cold data area from slower device */
+ if (f2fs_is_multi_device(sbi) && !__is_large_section(sbi))
+ SIT_I(sbi)->last_victim[ALLOC_NEXT] =
+ GET_SEGNO(sbi, FDEV(0).end_blk) + 1;
+
+ init_atgc_management(sbi);
+}
+
+static int free_segment_range(struct f2fs_sb_info *sbi,
+ unsigned int secs, bool gc_only)
+{
+ unsigned int segno, next_inuse, start, end;
+ struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
+ int gc_mode, gc_type;
+ int err = 0;
+ int type;
+
+ /* Force block allocation for GC */
+ MAIN_SECS(sbi) -= secs;
+ start = MAIN_SECS(sbi) * sbi->segs_per_sec;
+ end = MAIN_SEGS(sbi) - 1;
+
+ mutex_lock(&DIRTY_I(sbi)->seglist_lock);
+ for (gc_mode = 0; gc_mode < MAX_GC_POLICY; gc_mode++)
+ if (SIT_I(sbi)->last_victim[gc_mode] >= start)
+ SIT_I(sbi)->last_victim[gc_mode] = 0;
+
+ for (gc_type = BG_GC; gc_type <= FG_GC; gc_type++)
+ if (sbi->next_victim_seg[gc_type] >= start)
+ sbi->next_victim_seg[gc_type] = NULL_SEGNO;
+ mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
+
+ /* Move out cursegs from the target range */
+ for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
+ f2fs_allocate_segment_for_resize(sbi, type, start, end);
+
+ /* do GC to move out valid blocks in the range */
+ for (segno = start; segno <= end; segno += sbi->segs_per_sec) {
+ struct gc_inode_list gc_list = {
+ .ilist = LIST_HEAD_INIT(gc_list.ilist),
+ .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
+ };
+
+ do_garbage_collect(sbi, segno, &gc_list, FG_GC, true);
+ put_gc_inode(&gc_list);
+
+ if (!gc_only && get_valid_blocks(sbi, segno, true)) {
+ err = -EAGAIN;
+ goto out;
+ }
+ if (fatal_signal_pending(current)) {
+ err = -ERESTARTSYS;
+ goto out;
+ }
+ }
+ if (gc_only)
+ goto out;
+
+ err = f2fs_write_checkpoint(sbi, &cpc);
+ if (err)
+ goto out;
+
+ next_inuse = find_next_inuse(FREE_I(sbi), end + 1, start);
+ if (next_inuse <= end) {
+ f2fs_err(sbi, "segno %u should be free but still inuse!",
+ next_inuse);
+ f2fs_bug_on(sbi, 1);
+ }
+out:
+ MAIN_SECS(sbi) += secs;
+ return err;
+}
+
+static void update_sb_metadata(struct f2fs_sb_info *sbi, int secs)
+{
+ struct f2fs_super_block *raw_sb = F2FS_RAW_SUPER(sbi);
+ int section_count;
+ int segment_count;
+ int segment_count_main;
+ long long block_count;
+ int segs = secs * sbi->segs_per_sec;
+
+ f2fs_down_write(&sbi->sb_lock);
+
+ section_count = le32_to_cpu(raw_sb->section_count);
+ segment_count = le32_to_cpu(raw_sb->segment_count);
+ segment_count_main = le32_to_cpu(raw_sb->segment_count_main);
+ block_count = le64_to_cpu(raw_sb->block_count);
+
+ raw_sb->section_count = cpu_to_le32(section_count + secs);
+ raw_sb->segment_count = cpu_to_le32(segment_count + segs);
+ raw_sb->segment_count_main = cpu_to_le32(segment_count_main + segs);
+ raw_sb->block_count = cpu_to_le64(block_count +
+ (long long)segs * sbi->blocks_per_seg);
+ if (f2fs_is_multi_device(sbi)) {
+ int last_dev = sbi->s_ndevs - 1;
+ int dev_segs =
+ le32_to_cpu(raw_sb->devs[last_dev].total_segments);
+
+ raw_sb->devs[last_dev].total_segments =
+ cpu_to_le32(dev_segs + segs);
+ }
+
+ f2fs_up_write(&sbi->sb_lock);
+}
+
+static void update_fs_metadata(struct f2fs_sb_info *sbi, int secs)
+{
+ int segs = secs * sbi->segs_per_sec;
+ long long blks = (long long)segs * sbi->blocks_per_seg;
+ long long user_block_count =
+ le64_to_cpu(F2FS_CKPT(sbi)->user_block_count);
+
+ SM_I(sbi)->segment_count = (int)SM_I(sbi)->segment_count + segs;
+ MAIN_SEGS(sbi) = (int)MAIN_SEGS(sbi) + segs;
+ MAIN_SECS(sbi) += secs;
+ FREE_I(sbi)->free_sections = (int)FREE_I(sbi)->free_sections + secs;
+ FREE_I(sbi)->free_segments = (int)FREE_I(sbi)->free_segments + segs;
+ F2FS_CKPT(sbi)->user_block_count = cpu_to_le64(user_block_count + blks);
+
+ if (f2fs_is_multi_device(sbi)) {
+ int last_dev = sbi->s_ndevs - 1;
+
+ FDEV(last_dev).total_segments =
+ (int)FDEV(last_dev).total_segments + segs;
+ FDEV(last_dev).end_blk =
+ (long long)FDEV(last_dev).end_blk + blks;
+#ifdef CONFIG_BLK_DEV_ZONED
+ FDEV(last_dev).nr_blkz = (int)FDEV(last_dev).nr_blkz +
+ (int)(blks >> sbi->log_blocks_per_blkz);
+#endif
+ }
+}
+
+int f2fs_resize_fs(struct file *filp, __u64 block_count)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
+ __u64 old_block_count, shrunk_blocks;
+ struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
+ unsigned int secs;
+ int err = 0;
+ __u32 rem;
+
+ old_block_count = le64_to_cpu(F2FS_RAW_SUPER(sbi)->block_count);
+ if (block_count > old_block_count)
+ return -EINVAL;
+
+ if (f2fs_is_multi_device(sbi)) {
+ int last_dev = sbi->s_ndevs - 1;
+ __u64 last_segs = FDEV(last_dev).total_segments;
+
+ if (block_count + last_segs * sbi->blocks_per_seg <=
+ old_block_count)
+ return -EINVAL;
+ }
+
+ /* new fs size should align to section size */
+ div_u64_rem(block_count, BLKS_PER_SEC(sbi), &rem);
+ if (rem)
+ return -EINVAL;
+
+ if (block_count == old_block_count)
+ return 0;
+
+ if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+ f2fs_err(sbi, "Should run fsck to repair first.");
+ return -EFSCORRUPTED;
+ }
+
+ if (test_opt(sbi, DISABLE_CHECKPOINT)) {
+ f2fs_err(sbi, "Checkpoint should be enabled.");
+ return -EINVAL;
+ }
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
+ shrunk_blocks = old_block_count - block_count;
+ secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
+
+ /* stop other GC */
+ if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
+ err = -EAGAIN;
+ goto out_drop_write;
+ }
+
+ /* stop CP to protect MAIN_SEC in free_segment_range */
+ f2fs_lock_op(sbi);
+
+ spin_lock(&sbi->stat_lock);
+ if (shrunk_blocks + valid_user_blocks(sbi) +
+ sbi->current_reserved_blocks + sbi->unusable_block_count +
+ F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
+ err = -ENOSPC;
+ spin_unlock(&sbi->stat_lock);
+
+ if (err)
+ goto out_unlock;
+
+ err = free_segment_range(sbi, secs, true);
+
+out_unlock:
+ f2fs_unlock_op(sbi);
+ f2fs_up_write(&sbi->gc_lock);
+out_drop_write:
+ mnt_drop_write_file(filp);
+ if (err)
+ return err;
+
+ err = freeze_super(sbi->sb);
+ if (err)
+ return err;
+
+ if (f2fs_readonly(sbi->sb)) {
+ thaw_super(sbi->sb);
+ return -EROFS;
+ }
+
+ f2fs_down_write(&sbi->gc_lock);
+ f2fs_down_write(&sbi->cp_global_sem);
+
+ spin_lock(&sbi->stat_lock);
+ if (shrunk_blocks + valid_user_blocks(sbi) +
+ sbi->current_reserved_blocks + sbi->unusable_block_count +
+ F2FS_OPTION(sbi).root_reserved_blocks > sbi->user_block_count)
+ err = -ENOSPC;
+ else
+ sbi->user_block_count -= shrunk_blocks;
+ spin_unlock(&sbi->stat_lock);
+ if (err)
+ goto out_err;
+
+ set_sbi_flag(sbi, SBI_IS_RESIZEFS);
+ err = free_segment_range(sbi, secs, false);
+ if (err)
+ goto recover_out;
+
+ update_sb_metadata(sbi, -secs);
+
+ err = f2fs_commit_super(sbi, false);
+ if (err) {
+ update_sb_metadata(sbi, secs);
+ goto recover_out;
+ }
+
+ update_fs_metadata(sbi, -secs);
+ clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
+ set_sbi_flag(sbi, SBI_IS_DIRTY);
+
+ err = f2fs_write_checkpoint(sbi, &cpc);
+ if (err) {
+ update_fs_metadata(sbi, secs);
+ update_sb_metadata(sbi, secs);
+ f2fs_commit_super(sbi, false);
+ }
+recover_out:
+ clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
+ if (err) {
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ f2fs_err(sbi, "resize_fs failed, should run fsck to repair!");
+
+ spin_lock(&sbi->stat_lock);
+ sbi->user_block_count += shrunk_blocks;
+ spin_unlock(&sbi->stat_lock);
+ }
+out_err:
+ f2fs_up_write(&sbi->cp_global_sem);
+ f2fs_up_write(&sbi->gc_lock);
+ thaw_super(sbi->sb);
+ return err;
+}