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Subject[PATCH 3/3] f2fs: maintain discard interface separately
Date
This patch adds a new file discard.c to maintain discard related
function separately.

BTW, fix below checkpatch errors:

ERROR: space required before the open brace '{'
+ } else if (issued == -1){

ERROR: spaces required around that ':' (ctx:VxW)
+ devi, sbi->s_ndevs ? FDEV(devi).path: "",

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/Makefile | 2 +-
fs/f2fs/discard.c | 1009 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/f2fs.h | 34 +-
fs/f2fs/segment.c | 991 +---------------------------------------------------
4 files changed, 1037 insertions(+), 999 deletions(-)
create mode 100644 fs/f2fs/discard.c

diff --git a/fs/f2fs/Makefile b/fs/f2fs/Makefile
index 776c4b936504..43513c7b69aa 100644
--- a/fs/f2fs/Makefile
+++ b/fs/f2fs/Makefile
@@ -3,7 +3,7 @@ obj-$(CONFIG_F2FS_FS) += f2fs.o

f2fs-y := dir.o file.o inode.o namei.o hash.o super.o inline.o
f2fs-y += checkpoint.o gc.o data.o node.o segment.o recovery.o
-f2fs-y += shrinker.o extent_cache.o sysfs.o
+f2fs-y += shrinker.o extent_cache.o sysfs.o discard.o
f2fs-$(CONFIG_F2FS_STAT_FS) += debug.o
f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o
diff --git a/fs/f2fs/discard.c b/fs/f2fs/discard.c
new file mode 100644
index 000000000000..af6efb3c797b
--- /dev/null
+++ b/fs/f2fs/discard.c
@@ -0,0 +1,1009 @@
+/*
+ * f2fs discard support
+ *
+ * Copyright (c) 2018 Chao Yu <chao@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/f2fs_fs.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/sched/signal.h>
+
+#include "f2fs.h"
+#include "segment.h"
+#include "gc.h"
+#include <trace/events/f2fs.h>
+
+static struct kmem_cache *discard_entry_slab;
+static struct kmem_cache *discard_cmd_slab;
+
+static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t lstart,
+ block_t start, block_t len)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *pend_list;
+ struct discard_cmd *dc;
+
+ f2fs_bug_on(sbi, !len);
+
+ pend_list = &dcc->pend_list[plist_idx(len)];
+
+ dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS);
+ INIT_LIST_HEAD(&dc->list);
+ dc->bdev = bdev;
+ dc->lstart = lstart;
+ dc->start = start;
+ dc->len = len;
+ dc->ref = 0;
+ dc->state = D_PREP;
+ dc->error = 0;
+ init_completion(&dc->wait);
+ list_add_tail(&dc->list, pend_list);
+ atomic_inc(&dcc->discard_cmd_cnt);
+ dcc->undiscard_blks += len;
+
+ return dc;
+}
+
+static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t lstart,
+ block_t start, block_t len,
+ struct rb_node *parent, struct rb_node **p)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_cmd *dc;
+
+ dc = __create_discard_cmd(sbi, bdev, lstart, start, len);
+
+ rb_link_node(&dc->rb_node, parent, p);
+ rb_insert_color(&dc->rb_node, &dcc->root);
+
+ return dc;
+}
+
+static void __detach_discard_cmd(struct discard_cmd_control *dcc,
+ struct discard_cmd *dc)
+{
+ if (dc->state == D_DONE)
+ atomic_dec(&dcc->issing_discard);
+
+ list_del(&dc->list);
+ rb_erase(&dc->rb_node, &dcc->root);
+ dcc->undiscard_blks -= dc->len;
+
+ kmem_cache_free(discard_cmd_slab, dc);
+
+ atomic_dec(&dcc->discard_cmd_cnt);
+}
+
+static void __remove_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_cmd *dc)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+ trace_f2fs_remove_discard(dc->bdev, dc->start, dc->len);
+
+ f2fs_bug_on(sbi, dc->ref);
+
+ if (dc->error == -EOPNOTSUPP)
+ dc->error = 0;
+
+ if (dc->error)
+ f2fs_msg(sbi->sb, KERN_INFO,
+ "Issue discard(%u, %u, %u) failed, ret: %d",
+ dc->lstart, dc->start, dc->len, dc->error);
+ __detach_discard_cmd(dcc, dc);
+}
+
+static void f2fs_submit_discard_endio(struct bio *bio)
+{
+ struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
+
+ dc->error = blk_status_to_errno(bio->bi_status);
+ dc->state = D_DONE;
+ complete_all(&dc->wait);
+ bio_put(bio);
+}
+
+static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
+ block_t start, block_t end)
+{
+#ifdef CONFIG_F2FS_CHECK_FS
+ struct seg_entry *sentry;
+ unsigned int segno;
+ block_t blk = start;
+ unsigned long offset, size, max_blocks = sbi->blocks_per_seg;
+ unsigned long *map;
+
+ while (blk < end) {
+ segno = GET_SEGNO(sbi, blk);
+ sentry = get_seg_entry(sbi, segno);
+ offset = GET_BLKOFF_FROM_SEG0(sbi, blk);
+
+ if (end < START_BLOCK(sbi, segno + 1))
+ size = GET_BLKOFF_FROM_SEG0(sbi, end);
+ else
+ size = max_blocks;
+ map = (unsigned long *)(sentry->cur_valid_map);
+ offset = __find_rev_next_bit(map, size, offset);
+ f2fs_bug_on(sbi, offset != size);
+ blk = START_BLOCK(sbi, segno + 1);
+ }
+#endif
+}
+
+/* this function is copied from blkdev_issue_discard from block/blk-lib.c */
+static void __submit_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_policy *dpolicy,
+ struct discard_cmd *dc)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
+ &(dcc->fstrim_list) : &(dcc->wait_list);
+ struct bio *bio = NULL;
+ int flag = dpolicy->sync ? REQ_SYNC : 0;
+
+ if (dc->state != D_PREP)
+ return;
+
+ if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
+ return;
+
+ trace_f2fs_issue_discard(dc->bdev, dc->start, dc->len);
+
+ dc->error = __blkdev_issue_discard(dc->bdev,
+ SECTOR_FROM_BLOCK(dc->start),
+ SECTOR_FROM_BLOCK(dc->len),
+ GFP_NOFS, 0, &bio);
+ if (!dc->error) {
+ /* should keep before submission to avoid D_DONE right away */
+ dc->state = D_SUBMIT;
+ atomic_inc(&dcc->issued_discard);
+ atomic_inc(&dcc->issing_discard);
+ if (bio) {
+ bio->bi_private = dc;
+ bio->bi_end_io = f2fs_submit_discard_endio;
+ bio->bi_opf |= flag;
+ submit_bio(bio);
+ list_move_tail(&dc->list, wait_list);
+ __check_sit_bitmap(sbi, dc->start, dc->start + dc->len);
+
+ f2fs_update_iostat(sbi, FS_DISCARD, 1);
+ }
+ } else {
+ __remove_discard_cmd(sbi, dc);
+ }
+}
+
+static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t lstart,
+ block_t start, block_t len,
+ struct rb_node **insert_p,
+ struct rb_node *insert_parent)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct rb_node **p;
+ struct rb_node *parent = NULL;
+ struct discard_cmd *dc = NULL;
+
+ if (insert_p && insert_parent) {
+ parent = insert_parent;
+ p = insert_p;
+ goto do_insert;
+ }
+
+ p = __lookup_rb_tree_for_insert(sbi, &dcc->root, &parent, lstart);
+do_insert:
+ dc = __attach_discard_cmd(sbi, bdev, lstart, start, len, parent, p);
+ if (!dc)
+ return NULL;
+
+ return dc;
+}
+
+static void __relocate_discard_cmd(struct discard_cmd_control *dcc,
+ struct discard_cmd *dc)
+{
+ list_move_tail(&dc->list, &dcc->pend_list[plist_idx(dc->len)]);
+}
+
+static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_cmd *dc, block_t blkaddr)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_info di = dc->di;
+ bool modified = false;
+
+ if (dc->state == D_DONE || dc->len == 1) {
+ __remove_discard_cmd(sbi, dc);
+ return;
+ }
+
+ dcc->undiscard_blks -= di.len;
+
+ if (blkaddr > di.lstart) {
+ dc->len = blkaddr - dc->lstart;
+ dcc->undiscard_blks += dc->len;
+ __relocate_discard_cmd(dcc, dc);
+ modified = true;
+ }
+
+ if (blkaddr < di.lstart + di.len - 1) {
+ if (modified) {
+ __insert_discard_tree(sbi, dc->bdev, blkaddr + 1,
+ di.start + blkaddr + 1 - di.lstart,
+ di.lstart + di.len - 1 - blkaddr,
+ NULL, NULL);
+ } else {
+ dc->lstart++;
+ dc->len--;
+ dc->start++;
+ dcc->undiscard_blks += dc->len;
+ __relocate_discard_cmd(dcc, dc);
+ }
+ }
+}
+
+static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t lstart,
+ block_t start, block_t len)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
+ struct discard_cmd *dc;
+ struct discard_info di = {0};
+ struct rb_node **insert_p = NULL, *insert_parent = NULL;
+ block_t end = lstart + len;
+
+ mutex_lock(&dcc->cmd_lock);
+
+ dc = (struct discard_cmd *)__lookup_rb_tree_ret(&dcc->root,
+ NULL, lstart,
+ (struct rb_entry **)&prev_dc,
+ (struct rb_entry **)&next_dc,
+ &insert_p, &insert_parent, true);
+ if (dc)
+ prev_dc = dc;
+
+ if (!prev_dc) {
+ di.lstart = lstart;
+ di.len = next_dc ? next_dc->lstart - lstart : len;
+ di.len = min(di.len, len);
+ di.start = start;
+ }
+
+ while (1) {
+ struct rb_node *node;
+ bool merged = false;
+ struct discard_cmd *tdc = NULL;
+
+ if (prev_dc) {
+ di.lstart = prev_dc->lstart + prev_dc->len;
+ if (di.lstart < lstart)
+ di.lstart = lstart;
+ if (di.lstart >= end)
+ break;
+
+ if (!next_dc || next_dc->lstart > end)
+ di.len = end - di.lstart;
+ else
+ di.len = next_dc->lstart - di.lstart;
+ di.start = start + di.lstart - lstart;
+ }
+
+ if (!di.len)
+ goto next;
+
+ if (prev_dc && prev_dc->state == D_PREP &&
+ prev_dc->bdev == bdev &&
+ __is_discard_back_mergeable(&di, &prev_dc->di)) {
+ prev_dc->di.len += di.len;
+ dcc->undiscard_blks += di.len;
+ __relocate_discard_cmd(dcc, prev_dc);
+ di = prev_dc->di;
+ tdc = prev_dc;
+ merged = true;
+ }
+
+ if (next_dc && next_dc->state == D_PREP &&
+ next_dc->bdev == bdev &&
+ __is_discard_front_mergeable(&di, &next_dc->di)) {
+ next_dc->di.lstart = di.lstart;
+ next_dc->di.len += di.len;
+ next_dc->di.start = di.start;
+ dcc->undiscard_blks += di.len;
+ __relocate_discard_cmd(dcc, next_dc);
+ if (tdc)
+ __remove_discard_cmd(sbi, tdc);
+ merged = true;
+ }
+
+ if (!merged) {
+ __insert_discard_tree(sbi, bdev, di.lstart, di.start,
+ di.len, NULL, NULL);
+ }
+ next:
+ prev_dc = next_dc;
+ if (!prev_dc)
+ break;
+
+ node = rb_next(&prev_dc->rb_node);
+ next_dc = rb_entry_safe(node, struct discard_cmd, rb_node);
+ }
+
+ mutex_unlock(&dcc->cmd_lock);
+}
+
+static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t blkstart, block_t blklen)
+{
+ block_t lblkstart = blkstart;
+
+ trace_f2fs_queue_discard(bdev, blkstart, blklen);
+
+ if (sbi->s_ndevs) {
+ int devi = f2fs_target_device_index(sbi, blkstart);
+
+ blkstart -= FDEV(devi).start_blk;
+ }
+ __update_discard_tree_range(sbi, bdev, lblkstart, blkstart, blklen);
+ return 0;
+}
+
+static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
+ struct discard_policy *dpolicy,
+ unsigned int start, unsigned int end)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
+ struct rb_node **insert_p = NULL, *insert_parent = NULL;
+ struct discard_cmd *dc;
+ struct blk_plug plug;
+ int issued;
+
+next:
+ issued = 0;
+
+ mutex_lock(&dcc->cmd_lock);
+ f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
+
+ dc = (struct discard_cmd *)__lookup_rb_tree_ret(&dcc->root,
+ NULL, start,
+ (struct rb_entry **)&prev_dc,
+ (struct rb_entry **)&next_dc,
+ &insert_p, &insert_parent, true);
+ if (!dc)
+ dc = next_dc;
+
+ blk_start_plug(&plug);
+
+ while (dc && dc->lstart <= end) {
+ struct rb_node *node;
+
+ if (dc->len < dpolicy->granularity)
+ goto skip;
+
+ if (dc->state != D_PREP) {
+ list_move_tail(&dc->list, &dcc->fstrim_list);
+ goto skip;
+ }
+
+ __submit_discard_cmd(sbi, dpolicy, dc);
+
+ if (++issued >= dpolicy->max_requests) {
+ start = dc->lstart + dc->len;
+
+ blk_finish_plug(&plug);
+ mutex_unlock(&dcc->cmd_lock);
+
+ schedule();
+
+ goto next;
+ }
+skip:
+ node = rb_next(&dc->rb_node);
+ dc = rb_entry_safe(node, struct discard_cmd, rb_node);
+
+ if (fatal_signal_pending(current))
+ break;
+ }
+
+ blk_finish_plug(&plug);
+ mutex_unlock(&dcc->cmd_lock);
+}
+
+static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_policy *dpolicy)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *pend_list;
+ struct discard_cmd *dc, *tmp;
+ struct blk_plug plug;
+ int i, iter = 0, issued = 0;
+ bool io_interrupted = false;
+
+ for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
+ if (i + 1 < dpolicy->granularity)
+ break;
+ pend_list = &dcc->pend_list[i];
+
+ mutex_lock(&dcc->cmd_lock);
+ if (list_empty(pend_list))
+ goto next;
+ f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
+ blk_start_plug(&plug);
+ list_for_each_entry_safe(dc, tmp, pend_list, list) {
+ f2fs_bug_on(sbi, dc->state != D_PREP);
+
+ if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
+ !is_idle(sbi)) {
+ io_interrupted = true;
+ goto skip;
+ }
+
+ __submit_discard_cmd(sbi, dpolicy, dc);
+ issued++;
+skip:
+ if (++iter >= dpolicy->max_requests)
+ break;
+ }
+ blk_finish_plug(&plug);
+next:
+ mutex_unlock(&dcc->cmd_lock);
+
+ if (iter >= dpolicy->max_requests)
+ break;
+ }
+
+ if (!issued && io_interrupted)
+ issued = -1;
+
+ return issued;
+}
+
+static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *pend_list;
+ struct discard_cmd *dc, *tmp;
+ int i;
+ bool dropped = false;
+
+ mutex_lock(&dcc->cmd_lock);
+ for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
+ pend_list = &dcc->pend_list[i];
+ list_for_each_entry_safe(dc, tmp, pend_list, list) {
+ f2fs_bug_on(sbi, dc->state != D_PREP);
+ __remove_discard_cmd(sbi, dc);
+ dropped = true;
+ }
+ }
+ mutex_unlock(&dcc->cmd_lock);
+
+ return dropped;
+}
+
+void drop_discard_cmd(struct f2fs_sb_info *sbi)
+{
+ __drop_discard_cmd(sbi);
+}
+
+static unsigned int __wait_one_discard_bio(struct f2fs_sb_info *sbi,
+ struct discard_cmd *dc)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ unsigned int len = 0;
+
+ wait_for_completion_io(&dc->wait);
+ mutex_lock(&dcc->cmd_lock);
+ f2fs_bug_on(sbi, dc->state != D_DONE);
+ dc->ref--;
+ if (!dc->ref) {
+ if (!dc->error)
+ len = dc->len;
+ __remove_discard_cmd(sbi, dc);
+ }
+ mutex_unlock(&dcc->cmd_lock);
+
+ return len;
+}
+
+static unsigned int __wait_discard_cmd_range(struct f2fs_sb_info *sbi,
+ struct discard_policy *dpolicy,
+ block_t start, block_t end)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
+ &(dcc->fstrim_list) : &(dcc->wait_list);
+ struct discard_cmd *dc, *tmp;
+ bool need_wait;
+ unsigned int trimmed = 0;
+
+next:
+ need_wait = false;
+
+ mutex_lock(&dcc->cmd_lock);
+ list_for_each_entry_safe(dc, tmp, wait_list, list) {
+ if (dc->lstart + dc->len <= start || end <= dc->lstart)
+ continue;
+ if (dc->len < dpolicy->granularity)
+ continue;
+ if (dc->state == D_DONE && !dc->ref) {
+ wait_for_completion_io(&dc->wait);
+ if (!dc->error)
+ trimmed += dc->len;
+ __remove_discard_cmd(sbi, dc);
+ } else {
+ dc->ref++;
+ need_wait = true;
+ break;
+ }
+ }
+ mutex_unlock(&dcc->cmd_lock);
+
+ if (need_wait) {
+ trimmed += __wait_one_discard_bio(sbi, dc);
+ goto next;
+ }
+
+ return trimmed;
+}
+
+static void __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
+ struct discard_policy *dpolicy)
+{
+ __wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
+}
+
+/* This should be covered by global mutex, &sit_i->sentry_lock */
+void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_cmd *dc;
+ bool need_wait = false;
+
+ mutex_lock(&dcc->cmd_lock);
+ dc = (struct discard_cmd *)__lookup_rb_tree(&dcc->root, NULL, blkaddr);
+ if (dc) {
+ if (dc->state == D_PREP) {
+ __punch_discard_cmd(sbi, dc, blkaddr);
+ } else {
+ dc->ref++;
+ need_wait = true;
+ }
+ }
+ mutex_unlock(&dcc->cmd_lock);
+
+ if (need_wait)
+ __wait_one_discard_bio(sbi, dc);
+}
+
+void stop_discard_thread(struct f2fs_sb_info *sbi)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+ if (dcc && dcc->f2fs_issue_discard) {
+ struct task_struct *discard_thread = dcc->f2fs_issue_discard;
+
+ dcc->f2fs_issue_discard = NULL;
+ kthread_stop(discard_thread);
+ }
+}
+
+/* This comes from f2fs_put_super */
+bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct discard_policy dpolicy;
+ bool dropped;
+
+ init_discard_policy(&dpolicy, DPOLICY_UMOUNT, dcc->discard_granularity);
+ __issue_discard_cmd(sbi, &dpolicy);
+ dropped = __drop_discard_cmd(sbi);
+ __wait_all_discard_cmd(sbi, &dpolicy);
+
+ return dropped;
+}
+
+static int issue_discard_thread(void *data)
+{
+ struct f2fs_sb_info *sbi = data;
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ wait_queue_head_t *q = &dcc->discard_wait_queue;
+ struct discard_policy dpolicy;
+ unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
+ int issued;
+
+ set_freezable();
+
+ do {
+ init_discard_policy(&dpolicy, DPOLICY_BG,
+ dcc->discard_granularity);
+
+ wait_event_interruptible_timeout(*q,
+ kthread_should_stop() || freezing(current) ||
+ dcc->discard_wake,
+ msecs_to_jiffies(wait_ms));
+ if (try_to_freeze())
+ continue;
+ if (f2fs_readonly(sbi->sb))
+ continue;
+ if (kthread_should_stop())
+ return 0;
+ if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+ wait_ms = dpolicy.max_interval;
+ continue;
+ }
+
+ if (dcc->discard_wake)
+ dcc->discard_wake = 0;
+
+ down_read(&GC_I(sbi)->gc_rwsem);
+ if (GC_I(sbi)->f2fs_gc_task && GC_I(sbi)->gc_urgent)
+ init_discard_policy(&dpolicy, DPOLICY_FORCE, 1);
+ up_read(&GC_I(sbi)->gc_rwsem);
+
+ sb_start_intwrite(sbi->sb);
+
+ issued = __issue_discard_cmd(sbi, &dpolicy);
+ if (issued > 0) {
+ __wait_all_discard_cmd(sbi, &dpolicy);
+ wait_ms = dpolicy.min_interval;
+ } else if (issued == -1) {
+ wait_ms = dpolicy.mid_interval;
+ } else {
+ wait_ms = dpolicy.max_interval;
+ }
+
+ sb_end_intwrite(sbi->sb);
+
+ } while (!kthread_should_stop());
+ return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_ZONED
+static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t blkstart, block_t blklen)
+{
+ sector_t sector, nr_sects;
+ block_t lblkstart = blkstart;
+ int devi = 0;
+
+ if (sbi->s_ndevs) {
+ devi = f2fs_target_device_index(sbi, blkstart);
+ blkstart -= FDEV(devi).start_blk;
+ }
+
+ /*
+ * We need to know the type of the zone: for conventional zones,
+ * use regular discard if the drive supports it. For sequential
+ * zones, reset the zone write pointer.
+ */
+ switch (get_blkz_type(sbi, bdev, blkstart)) {
+
+ case BLK_ZONE_TYPE_CONVENTIONAL:
+ if (!blk_queue_discard(bdev_get_queue(bdev)))
+ return 0;
+ return __queue_discard_cmd(sbi, bdev, lblkstart, blklen);
+ case BLK_ZONE_TYPE_SEQWRITE_REQ:
+ case BLK_ZONE_TYPE_SEQWRITE_PREF:
+ sector = SECTOR_FROM_BLOCK(blkstart);
+ nr_sects = SECTOR_FROM_BLOCK(blklen);
+
+ if (sector & (bdev_zone_sectors(bdev) - 1) ||
+ nr_sects != bdev_zone_sectors(bdev)) {
+ f2fs_msg(sbi->sb, KERN_INFO,
+ "(%d) %s: Unaligned discard attempted (block %x + %x)",
+ devi, sbi->s_ndevs ? FDEV(devi).path : "",
+ blkstart, blklen);
+ return -EIO;
+ }
+ trace_f2fs_issue_reset_zone(bdev, blkstart);
+ return blkdev_reset_zones(bdev, sector,
+ nr_sects, GFP_NOFS);
+ default:
+ /* Unknown zone type: broken device ? */
+ return -EIO;
+ }
+}
+#endif
+
+static int __issue_discard_async(struct f2fs_sb_info *sbi,
+ struct block_device *bdev, block_t blkstart, block_t blklen)
+{
+#ifdef CONFIG_BLK_DEV_ZONED
+ if (f2fs_sb_has_blkzoned(sbi->sb) &&
+ bdev_zoned_model(bdev) != BLK_ZONED_NONE)
+ return __f2fs_issue_discard_zone(sbi, bdev, blkstart, blklen);
+#endif
+ return __queue_discard_cmd(sbi, bdev, blkstart, blklen);
+}
+
+int f2fs_issue_discard(struct f2fs_sb_info *sbi,
+ block_t blkstart, block_t blklen)
+{
+ sector_t start = blkstart, len = 0;
+ struct block_device *bdev;
+ struct seg_entry *se;
+ unsigned int offset;
+ block_t i;
+ int err = 0;
+
+ bdev = f2fs_target_device(sbi, blkstart, NULL);
+
+ for (i = blkstart; i < blkstart + blklen; i++, len++) {
+ if (i != start) {
+ struct block_device *bdev2 =
+ f2fs_target_device(sbi, i, NULL);
+
+ if (bdev2 != bdev) {
+ err = __issue_discard_async(sbi, bdev,
+ start, len);
+ if (err)
+ return err;
+ bdev = bdev2;
+ start = i;
+ len = 0;
+ }
+ }
+
+ se = get_seg_entry(sbi, GET_SEGNO(sbi, i));
+ offset = GET_BLKOFF_FROM_SEG0(sbi, i);
+
+ if (!f2fs_test_and_set_bit(offset, se->discard_map))
+ sbi->discard_blks--;
+ }
+
+ if (len)
+ err = __issue_discard_async(sbi, bdev, start, len);
+ return err;
+}
+
+bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
+ bool check_only)
+{
+ int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
+ int max_blocks = sbi->blocks_per_seg;
+ struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
+ unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
+ unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
+ unsigned long *discard_map = (unsigned long *)se->discard_map;
+ unsigned long *dmap = SIT_I(sbi)->tmp_map;
+ unsigned int start = 0, end = -1;
+ bool force = (cpc->reason & CP_DISCARD);
+ struct discard_entry *de = NULL;
+ struct list_head *head = &SM_I(sbi)->dcc_info->entry_list;
+ int i;
+
+ if (se->valid_blocks == max_blocks || !f2fs_discard_en(sbi))
+ return false;
+
+ if (!force) {
+ if (!test_opt(sbi, DISCARD) || !se->valid_blocks ||
+ SM_I(sbi)->dcc_info->nr_discards >=
+ SM_I(sbi)->dcc_info->max_discards)
+ return false;
+ }
+
+ /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
+ for (i = 0; i < entries; i++)
+ dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
+ (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
+
+ while (force || SM_I(sbi)->dcc_info->nr_discards <=
+ SM_I(sbi)->dcc_info->max_discards) {
+ start = __find_rev_next_bit(dmap, max_blocks, end + 1);
+ if (start >= max_blocks)
+ break;
+
+ end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
+ if (force && start && end != max_blocks
+ && (end - start) < cpc->trim_minlen)
+ continue;
+
+ if (check_only)
+ return true;
+
+ if (!de) {
+ de = f2fs_kmem_cache_alloc(discard_entry_slab,
+ GFP_F2FS_ZERO);
+ de->start_blkaddr = START_BLOCK(sbi, cpc->trim_start);
+ list_add_tail(&de->list, head);
+ }
+
+ for (i = start; i < end; i++)
+ __set_bit_le(i, (void *)de->discard_map);
+
+ SM_I(sbi)->dcc_info->nr_discards += end - start;
+ }
+ return false;
+}
+
+void release_discard_addr(struct discard_entry *entry)
+{
+ list_del(&entry->list);
+ kmem_cache_free(discard_entry_slab, entry);
+}
+
+void release_discard_addrs(struct f2fs_sb_info *sbi)
+{
+ struct list_head *head = &(SM_I(sbi)->dcc_info->entry_list);
+ struct discard_entry *entry, *this;
+
+ /* drop caches */
+ list_for_each_entry_safe(entry, this, head, list) {
+ list_del(&entry->list);
+ kmem_cache_free(discard_entry_slab, entry);
+ }
+}
+
+void init_discard_policy(struct discard_policy *dpolicy,
+ int discard_type, unsigned int granularity)
+{
+ /* common policy */
+ dpolicy->type = discard_type;
+ dpolicy->sync = true;
+ dpolicy->granularity = granularity;
+
+ dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
+ dpolicy->io_aware_gran = MAX_PLIST_NUM;
+
+ if (discard_type == DPOLICY_BG) {
+ dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
+ dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
+ dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
+ dpolicy->io_aware = true;
+ dpolicy->sync = false;
+ } else if (discard_type == DPOLICY_FORCE) {
+ dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
+ dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
+ dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
+ dpolicy->io_aware = false;
+ } else if (discard_type == DPOLICY_FSTRIM) {
+ dpolicy->io_aware = false;
+ } else if (discard_type == DPOLICY_UMOUNT) {
+ dpolicy->max_requests = UINT_MAX;
+ dpolicy->io_aware = false;
+ }
+}
+
+int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
+{
+ __u64 start = F2FS_BYTES_TO_BLK(range->start);
+ __u64 end = start + F2FS_BYTES_TO_BLK(range->len) - 1;
+ unsigned int start_segno, end_segno;
+ block_t start_block, end_block;
+ struct cp_control cpc;
+ struct discard_policy dpolicy;
+ unsigned long long trimmed = 0;
+ int err = 0;
+
+ if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
+ return -EINVAL;
+
+ if (end <= MAIN_BLKADDR(sbi))
+ return -EINVAL;
+
+ if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+ f2fs_msg(sbi->sb, KERN_WARNING,
+ "Found FS corruption, run fsck to fix.");
+ return -EIO;
+ }
+
+ /* start/end segment number in main_area */
+ start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
+ end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
+ GET_SEGNO(sbi, end);
+
+ cpc.reason = CP_DISCARD;
+ cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
+ cpc.trim_start = start_segno;
+ cpc.trim_end = end_segno;
+
+ if (sbi->discard_blks == 0)
+ goto out;
+
+ mutex_lock(&sbi->gc_mutex);
+ err = write_checkpoint(sbi, &cpc);
+ mutex_unlock(&sbi->gc_mutex);
+ if (err)
+ goto out;
+
+ start_block = START_BLOCK(sbi, start_segno);
+ end_block = START_BLOCK(sbi, end_segno + 1);
+
+ init_discard_policy(&dpolicy, DPOLICY_FSTRIM, cpc.trim_minlen);
+ __issue_discard_cmd_range(sbi, &dpolicy, start_block, end_block);
+ trimmed = __wait_discard_cmd_range(sbi, &dpolicy,
+ start_block, end_block);
+out:
+ range->len = F2FS_BLK_TO_BYTES(trimmed);
+ return err;
+}
+
+int create_discard_cmd_control(struct f2fs_sb_info *sbi)
+{
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ struct discard_cmd_control *dcc;
+ int err = 0, i;
+
+ if (SM_I(sbi)->dcc_info) {
+ dcc = SM_I(sbi)->dcc_info;
+ goto init_thread;
+ }
+
+ dcc = f2fs_kzalloc(sbi, sizeof(struct discard_cmd_control), GFP_KERNEL);
+ if (!dcc)
+ return -ENOMEM;
+
+ dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY;
+ INIT_LIST_HEAD(&dcc->entry_list);
+ for (i = 0; i < MAX_PLIST_NUM; i++)
+ INIT_LIST_HEAD(&dcc->pend_list[i]);
+ INIT_LIST_HEAD(&dcc->wait_list);
+ INIT_LIST_HEAD(&dcc->fstrim_list);
+ mutex_init(&dcc->cmd_lock);
+ atomic_set(&dcc->issued_discard, 0);
+ atomic_set(&dcc->issing_discard, 0);
+ atomic_set(&dcc->discard_cmd_cnt, 0);
+ dcc->nr_discards = 0;
+ dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
+ dcc->undiscard_blks = 0;
+ dcc->root = RB_ROOT;
+
+ init_waitqueue_head(&dcc->discard_wait_queue);
+ SM_I(sbi)->dcc_info = dcc;
+init_thread:
+ dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
+ "f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
+ if (IS_ERR(dcc->f2fs_issue_discard)) {
+ err = PTR_ERR(dcc->f2fs_issue_discard);
+ kfree(dcc);
+ SM_I(sbi)->dcc_info = NULL;
+ return err;
+ }
+
+ return err;
+}
+
+void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+ if (!dcc)
+ return;
+
+ stop_discard_thread(sbi);
+
+ kfree(dcc);
+ SM_I(sbi)->dcc_info = NULL;
+}
+
+int __init create_discard_caches(void)
+{
+ discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
+ sizeof(struct discard_entry));
+ if (!discard_entry_slab)
+ goto fail;
+
+ discard_cmd_slab = f2fs_kmem_cache_create("discard_cmd",
+ sizeof(struct discard_cmd));
+ if (!discard_cmd_slab)
+ goto destroy_discard_entry;
+ return 0;
+destroy_discard_entry:
+ kmem_cache_destroy(discard_entry_slab);
+fail:
+ return -ENOMEM;
+}
+
+void destroy_discard_caches(void)
+{
+ kmem_cache_destroy(discard_cmd_slab);
+ kmem_cache_destroy(discard_entry_slab);
+}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c8d6d27384f1..64e3677998d8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2803,6 +2803,10 @@ void destroy_node_manager_caches(void);
/*
* segment.c
*/
+unsigned long __find_rev_next_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset);
+unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset);
bool need_SSR(struct f2fs_sb_info *sbi);
void register_inmem_page(struct inode *inode, struct page *page);
void drop_inmem_pages_all(struct f2fs_sb_info *sbi);
@@ -2817,16 +2821,9 @@ int f2fs_flush_device_cache(struct f2fs_sb_info *sbi);
void destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free);
void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr);
bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr);
-void init_discard_policy(struct discard_policy *dpolicy, int discard_type,
- unsigned int granularity);
-void drop_discard_cmd(struct f2fs_sb_info *sbi);
-void stop_discard_thread(struct f2fs_sb_info *sbi);
-bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc);
-void release_discard_addrs(struct f2fs_sb_info *sbi);
int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
void allocate_new_segments(struct f2fs_sb_info *sbi);
-int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
bool exist_trim_candidates(struct f2fs_sb_info *sbi, struct cp_control *cpc);
struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno);
void update_meta_page(struct f2fs_sb_info *sbi, void *src, block_t blk_addr);
@@ -2856,8 +2853,6 @@ int lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
void flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc);
int build_segment_manager(struct f2fs_sb_info *sbi);
void destroy_segment_manager(struct f2fs_sb_info *sbi);
-int __init create_discard_caches(void);
-void destroy_discard_caches(void);
int __init create_segment_manager_caches(void);
void destroy_segment_manager_caches(void);
int rw_hint_to_seg_type(enum rw_hint hint);
@@ -3246,6 +3241,27 @@ void f2fs_exit_sysfs(void);
int f2fs_register_sysfs(struct f2fs_sb_info *sbi);
void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi);

+/*
+ * discard.c
+ */
+void init_discard_policy(struct discard_policy *dpolicy, int discard_type,
+ unsigned int granularity);
+void drop_discard_cmd(struct f2fs_sb_info *sbi);
+void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr);
+void stop_discard_thread(struct f2fs_sb_info *sbi);
+bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
+int f2fs_issue_discard(struct f2fs_sb_info *sbi,
+ block_t blkstart, block_t blklen);
+bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
+ bool check_only);
+void release_discard_addr(struct discard_entry *entry);
+void release_discard_addrs(struct f2fs_sb_info *sbi);
+int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
+int create_discard_cmd_control(struct f2fs_sb_info *sbi);
+void destroy_discard_cmd_control(struct f2fs_sb_info *sbi);
+int __init create_discard_caches(void);
+void destroy_discard_caches(void);
+
/*
* crypto support
*/
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 187f957747be..f85a537100d7 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -28,8 +28,6 @@

#define __reverse_ffz(x) __reverse_ffs(~(x))

-static struct kmem_cache *discard_entry_slab;
-static struct kmem_cache *discard_cmd_slab;
static struct kmem_cache *sit_entry_set_slab;
static struct kmem_cache *inmem_entry_slab;

@@ -96,7 +94,7 @@ static inline unsigned long __reverse_ffs(unsigned long word)
* f2fs_set_bit(0, bitmap) => 1000 0000
* f2fs_set_bit(7, bitmap) => 0000 0001
*/
-static unsigned long __find_rev_next_bit(const unsigned long *addr,
+unsigned long __find_rev_next_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
const unsigned long *p = addr + BIT_WORD(offset);
@@ -132,7 +130,7 @@ static unsigned long __find_rev_next_bit(const unsigned long *addr,
return result - size + __reverse_ffs(tmp);
}

-static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
+unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
const unsigned long *p = addr + BIT_WORD(offset);
@@ -806,825 +804,6 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
mutex_unlock(&dirty_i->seglist_lock);
}

-static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t lstart,
- block_t start, block_t len)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct list_head *pend_list;
- struct discard_cmd *dc;
-
- f2fs_bug_on(sbi, !len);
-
- pend_list = &dcc->pend_list[plist_idx(len)];
-
- dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS);
- INIT_LIST_HEAD(&dc->list);
- dc->bdev = bdev;
- dc->lstart = lstart;
- dc->start = start;
- dc->len = len;
- dc->ref = 0;
- dc->state = D_PREP;
- dc->error = 0;
- init_completion(&dc->wait);
- list_add_tail(&dc->list, pend_list);
- atomic_inc(&dcc->discard_cmd_cnt);
- dcc->undiscard_blks += len;
-
- return dc;
-}
-
-static struct discard_cmd *__attach_discard_cmd(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t lstart,
- block_t start, block_t len,
- struct rb_node *parent, struct rb_node **p)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_cmd *dc;
-
- dc = __create_discard_cmd(sbi, bdev, lstart, start, len);
-
- rb_link_node(&dc->rb_node, parent, p);
- rb_insert_color(&dc->rb_node, &dcc->root);
-
- return dc;
-}
-
-static void __detach_discard_cmd(struct discard_cmd_control *dcc,
- struct discard_cmd *dc)
-{
- if (dc->state == D_DONE)
- atomic_dec(&dcc->issing_discard);
-
- list_del(&dc->list);
- rb_erase(&dc->rb_node, &dcc->root);
- dcc->undiscard_blks -= dc->len;
-
- kmem_cache_free(discard_cmd_slab, dc);
-
- atomic_dec(&dcc->discard_cmd_cnt);
-}
-
-static void __remove_discard_cmd(struct f2fs_sb_info *sbi,
- struct discard_cmd *dc)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
-
- trace_f2fs_remove_discard(dc->bdev, dc->start, dc->len);
-
- f2fs_bug_on(sbi, dc->ref);
-
- if (dc->error == -EOPNOTSUPP)
- dc->error = 0;
-
- if (dc->error)
- f2fs_msg(sbi->sb, KERN_INFO,
- "Issue discard(%u, %u, %u) failed, ret: %d",
- dc->lstart, dc->start, dc->len, dc->error);
- __detach_discard_cmd(dcc, dc);
-}
-
-static void f2fs_submit_discard_endio(struct bio *bio)
-{
- struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
-
- dc->error = blk_status_to_errno(bio->bi_status);
- dc->state = D_DONE;
- complete_all(&dc->wait);
- bio_put(bio);
-}
-
-static void __check_sit_bitmap(struct f2fs_sb_info *sbi,
- block_t start, block_t end)
-{
-#ifdef CONFIG_F2FS_CHECK_FS
- struct seg_entry *sentry;
- unsigned int segno;
- block_t blk = start;
- unsigned long offset, size, max_blocks = sbi->blocks_per_seg;
- unsigned long *map;
-
- while (blk < end) {
- segno = GET_SEGNO(sbi, blk);
- sentry = get_seg_entry(sbi, segno);
- offset = GET_BLKOFF_FROM_SEG0(sbi, blk);
-
- if (end < START_BLOCK(sbi, segno + 1))
- size = GET_BLKOFF_FROM_SEG0(sbi, end);
- else
- size = max_blocks;
- map = (unsigned long *)(sentry->cur_valid_map);
- offset = __find_rev_next_bit(map, size, offset);
- f2fs_bug_on(sbi, offset != size);
- blk = START_BLOCK(sbi, segno + 1);
- }
-#endif
-}
-
-/* this function is copied from blkdev_issue_discard from block/blk-lib.c */
-static void __submit_discard_cmd(struct f2fs_sb_info *sbi,
- struct discard_policy *dpolicy,
- struct discard_cmd *dc)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
- &(dcc->fstrim_list) : &(dcc->wait_list);
- struct bio *bio = NULL;
- int flag = dpolicy->sync ? REQ_SYNC : 0;
-
- if (dc->state != D_PREP)
- return;
-
- if (is_sbi_flag_set(sbi, SBI_NEED_FSCK))
- return;
-
- trace_f2fs_issue_discard(dc->bdev, dc->start, dc->len);
-
- dc->error = __blkdev_issue_discard(dc->bdev,
- SECTOR_FROM_BLOCK(dc->start),
- SECTOR_FROM_BLOCK(dc->len),
- GFP_NOFS, 0, &bio);
- if (!dc->error) {
- /* should keep before submission to avoid D_DONE right away */
- dc->state = D_SUBMIT;
- atomic_inc(&dcc->issued_discard);
- atomic_inc(&dcc->issing_discard);
- if (bio) {
- bio->bi_private = dc;
- bio->bi_end_io = f2fs_submit_discard_endio;
- bio->bi_opf |= flag;
- submit_bio(bio);
- list_move_tail(&dc->list, wait_list);
- __check_sit_bitmap(sbi, dc->start, dc->start + dc->len);
-
- f2fs_update_iostat(sbi, FS_DISCARD, 1);
- }
- } else {
- __remove_discard_cmd(sbi, dc);
- }
-}
-
-static struct discard_cmd *__insert_discard_tree(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t lstart,
- block_t start, block_t len,
- struct rb_node **insert_p,
- struct rb_node *insert_parent)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct rb_node **p;
- struct rb_node *parent = NULL;
- struct discard_cmd *dc = NULL;
-
- if (insert_p && insert_parent) {
- parent = insert_parent;
- p = insert_p;
- goto do_insert;
- }
-
- p = __lookup_rb_tree_for_insert(sbi, &dcc->root, &parent, lstart);
-do_insert:
- dc = __attach_discard_cmd(sbi, bdev, lstart, start, len, parent, p);
- if (!dc)
- return NULL;
-
- return dc;
-}
-
-static void __relocate_discard_cmd(struct discard_cmd_control *dcc,
- struct discard_cmd *dc)
-{
- list_move_tail(&dc->list, &dcc->pend_list[plist_idx(dc->len)]);
-}
-
-static void __punch_discard_cmd(struct f2fs_sb_info *sbi,
- struct discard_cmd *dc, block_t blkaddr)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_info di = dc->di;
- bool modified = false;
-
- if (dc->state == D_DONE || dc->len == 1) {
- __remove_discard_cmd(sbi, dc);
- return;
- }
-
- dcc->undiscard_blks -= di.len;
-
- if (blkaddr > di.lstart) {
- dc->len = blkaddr - dc->lstart;
- dcc->undiscard_blks += dc->len;
- __relocate_discard_cmd(dcc, dc);
- modified = true;
- }
-
- if (blkaddr < di.lstart + di.len - 1) {
- if (modified) {
- __insert_discard_tree(sbi, dc->bdev, blkaddr + 1,
- di.start + blkaddr + 1 - di.lstart,
- di.lstart + di.len - 1 - blkaddr,
- NULL, NULL);
- } else {
- dc->lstart++;
- dc->len--;
- dc->start++;
- dcc->undiscard_blks += dc->len;
- __relocate_discard_cmd(dcc, dc);
- }
- }
-}
-
-static void __update_discard_tree_range(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t lstart,
- block_t start, block_t len)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
- struct discard_cmd *dc;
- struct discard_info di = {0};
- struct rb_node **insert_p = NULL, *insert_parent = NULL;
- block_t end = lstart + len;
-
- mutex_lock(&dcc->cmd_lock);
-
- dc = (struct discard_cmd *)__lookup_rb_tree_ret(&dcc->root,
- NULL, lstart,
- (struct rb_entry **)&prev_dc,
- (struct rb_entry **)&next_dc,
- &insert_p, &insert_parent, true);
- if (dc)
- prev_dc = dc;
-
- if (!prev_dc) {
- di.lstart = lstart;
- di.len = next_dc ? next_dc->lstart - lstart : len;
- di.len = min(di.len, len);
- di.start = start;
- }
-
- while (1) {
- struct rb_node *node;
- bool merged = false;
- struct discard_cmd *tdc = NULL;
-
- if (prev_dc) {
- di.lstart = prev_dc->lstart + prev_dc->len;
- if (di.lstart < lstart)
- di.lstart = lstart;
- if (di.lstart >= end)
- break;
-
- if (!next_dc || next_dc->lstart > end)
- di.len = end - di.lstart;
- else
- di.len = next_dc->lstart - di.lstart;
- di.start = start + di.lstart - lstart;
- }
-
- if (!di.len)
- goto next;
-
- if (prev_dc && prev_dc->state == D_PREP &&
- prev_dc->bdev == bdev &&
- __is_discard_back_mergeable(&di, &prev_dc->di)) {
- prev_dc->di.len += di.len;
- dcc->undiscard_blks += di.len;
- __relocate_discard_cmd(dcc, prev_dc);
- di = prev_dc->di;
- tdc = prev_dc;
- merged = true;
- }
-
- if (next_dc && next_dc->state == D_PREP &&
- next_dc->bdev == bdev &&
- __is_discard_front_mergeable(&di, &next_dc->di)) {
- next_dc->di.lstart = di.lstart;
- next_dc->di.len += di.len;
- next_dc->di.start = di.start;
- dcc->undiscard_blks += di.len;
- __relocate_discard_cmd(dcc, next_dc);
- if (tdc)
- __remove_discard_cmd(sbi, tdc);
- merged = true;
- }
-
- if (!merged) {
- __insert_discard_tree(sbi, bdev, di.lstart, di.start,
- di.len, NULL, NULL);
- }
- next:
- prev_dc = next_dc;
- if (!prev_dc)
- break;
-
- node = rb_next(&prev_dc->rb_node);
- next_dc = rb_entry_safe(node, struct discard_cmd, rb_node);
- }
-
- mutex_unlock(&dcc->cmd_lock);
-}
-
-static int __queue_discard_cmd(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t blkstart, block_t blklen)
-{
- block_t lblkstart = blkstart;
-
- trace_f2fs_queue_discard(bdev, blkstart, blklen);
-
- if (sbi->s_ndevs) {
- int devi = f2fs_target_device_index(sbi, blkstart);
-
- blkstart -= FDEV(devi).start_blk;
- }
- __update_discard_tree_range(sbi, bdev, lblkstart, blkstart, blklen);
- return 0;
-}
-
-static void __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
- struct discard_policy *dpolicy,
- unsigned int start, unsigned int end)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_cmd *prev_dc = NULL, *next_dc = NULL;
- struct rb_node **insert_p = NULL, *insert_parent = NULL;
- struct discard_cmd *dc;
- struct blk_plug plug;
- int issued;
-
-next:
- issued = 0;
-
- mutex_lock(&dcc->cmd_lock);
- f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
-
- dc = (struct discard_cmd *)__lookup_rb_tree_ret(&dcc->root,
- NULL, start,
- (struct rb_entry **)&prev_dc,
- (struct rb_entry **)&next_dc,
- &insert_p, &insert_parent, true);
- if (!dc)
- dc = next_dc;
-
- blk_start_plug(&plug);
-
- while (dc && dc->lstart <= end) {
- struct rb_node *node;
-
- if (dc->len < dpolicy->granularity)
- goto skip;
-
- if (dc->state != D_PREP) {
- list_move_tail(&dc->list, &dcc->fstrim_list);
- goto skip;
- }
-
- __submit_discard_cmd(sbi, dpolicy, dc);
-
- if (++issued >= dpolicy->max_requests) {
- start = dc->lstart + dc->len;
-
- blk_finish_plug(&plug);
- mutex_unlock(&dcc->cmd_lock);
-
- schedule();
-
- goto next;
- }
-skip:
- node = rb_next(&dc->rb_node);
- dc = rb_entry_safe(node, struct discard_cmd, rb_node);
-
- if (fatal_signal_pending(current))
- break;
- }
-
- blk_finish_plug(&plug);
- mutex_unlock(&dcc->cmd_lock);
-}
-
-static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
- struct discard_policy *dpolicy)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct list_head *pend_list;
- struct discard_cmd *dc, *tmp;
- struct blk_plug plug;
- int i, iter = 0, issued = 0;
- bool io_interrupted = false;
-
- for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
- if (i + 1 < dpolicy->granularity)
- break;
- pend_list = &dcc->pend_list[i];
-
- mutex_lock(&dcc->cmd_lock);
- if (list_empty(pend_list))
- goto next;
- f2fs_bug_on(sbi, !__check_rb_tree_consistence(sbi, &dcc->root));
- blk_start_plug(&plug);
- list_for_each_entry_safe(dc, tmp, pend_list, list) {
- f2fs_bug_on(sbi, dc->state != D_PREP);
-
- if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
- !is_idle(sbi)) {
- io_interrupted = true;
- goto skip;
- }
-
- __submit_discard_cmd(sbi, dpolicy, dc);
- issued++;
-skip:
- if (++iter >= dpolicy->max_requests)
- break;
- }
- blk_finish_plug(&plug);
-next:
- mutex_unlock(&dcc->cmd_lock);
-
- if (iter >= dpolicy->max_requests)
- break;
- }
-
- if (!issued && io_interrupted)
- issued = -1;
-
- return issued;
-}
-
-static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct list_head *pend_list;
- struct discard_cmd *dc, *tmp;
- int i;
- bool dropped = false;
-
- mutex_lock(&dcc->cmd_lock);
- for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
- pend_list = &dcc->pend_list[i];
- list_for_each_entry_safe(dc, tmp, pend_list, list) {
- f2fs_bug_on(sbi, dc->state != D_PREP);
- __remove_discard_cmd(sbi, dc);
- dropped = true;
- }
- }
- mutex_unlock(&dcc->cmd_lock);
-
- return dropped;
-}
-
-void drop_discard_cmd(struct f2fs_sb_info *sbi)
-{
- __drop_discard_cmd(sbi);
-}
-
-static unsigned int __wait_one_discard_bio(struct f2fs_sb_info *sbi,
- struct discard_cmd *dc)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- unsigned int len = 0;
-
- wait_for_completion_io(&dc->wait);
- mutex_lock(&dcc->cmd_lock);
- f2fs_bug_on(sbi, dc->state != D_DONE);
- dc->ref--;
- if (!dc->ref) {
- if (!dc->error)
- len = dc->len;
- __remove_discard_cmd(sbi, dc);
- }
- mutex_unlock(&dcc->cmd_lock);
-
- return len;
-}
-
-static unsigned int __wait_discard_cmd_range(struct f2fs_sb_info *sbi,
- struct discard_policy *dpolicy,
- block_t start, block_t end)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct list_head *wait_list = (dpolicy->type == DPOLICY_FSTRIM) ?
- &(dcc->fstrim_list) : &(dcc->wait_list);
- struct discard_cmd *dc, *tmp;
- bool need_wait;
- unsigned int trimmed = 0;
-
-next:
- need_wait = false;
-
- mutex_lock(&dcc->cmd_lock);
- list_for_each_entry_safe(dc, tmp, wait_list, list) {
- if (dc->lstart + dc->len <= start || end <= dc->lstart)
- continue;
- if (dc->len < dpolicy->granularity)
- continue;
- if (dc->state == D_DONE && !dc->ref) {
- wait_for_completion_io(&dc->wait);
- if (!dc->error)
- trimmed += dc->len;
- __remove_discard_cmd(sbi, dc);
- } else {
- dc->ref++;
- need_wait = true;
- break;
- }
- }
- mutex_unlock(&dcc->cmd_lock);
-
- if (need_wait) {
- trimmed += __wait_one_discard_bio(sbi, dc);
- goto next;
- }
-
- return trimmed;
-}
-
-static void __wait_all_discard_cmd(struct f2fs_sb_info *sbi,
- struct discard_policy *dpolicy)
-{
- __wait_discard_cmd_range(sbi, dpolicy, 0, UINT_MAX);
-}
-
-/* This should be covered by global mutex, &sit_i->sentry_lock */
-static void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_cmd *dc;
- bool need_wait = false;
-
- mutex_lock(&dcc->cmd_lock);
- dc = (struct discard_cmd *)__lookup_rb_tree(&dcc->root, NULL, blkaddr);
- if (dc) {
- if (dc->state == D_PREP) {
- __punch_discard_cmd(sbi, dc, blkaddr);
- } else {
- dc->ref++;
- need_wait = true;
- }
- }
- mutex_unlock(&dcc->cmd_lock);
-
- if (need_wait)
- __wait_one_discard_bio(sbi, dc);
-}
-
-void stop_discard_thread(struct f2fs_sb_info *sbi)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
-
- if (dcc && dcc->f2fs_issue_discard) {
- struct task_struct *discard_thread = dcc->f2fs_issue_discard;
-
- dcc->f2fs_issue_discard = NULL;
- kthread_stop(discard_thread);
- }
-}
-
-/* This comes from f2fs_put_super */
-bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- struct discard_policy dpolicy;
- bool dropped;
-
- init_discard_policy(&dpolicy, DPOLICY_UMOUNT, dcc->discard_granularity);
- __issue_discard_cmd(sbi, &dpolicy);
- dropped = __drop_discard_cmd(sbi);
- __wait_all_discard_cmd(sbi, &dpolicy);
-
- return dropped;
-}
-
-static int issue_discard_thread(void *data)
-{
- struct f2fs_sb_info *sbi = data;
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
- wait_queue_head_t *q = &dcc->discard_wait_queue;
- struct discard_policy dpolicy;
- unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
- int issued;
-
- set_freezable();
-
- do {
- init_discard_policy(&dpolicy, DPOLICY_BG,
- dcc->discard_granularity);
-
- wait_event_interruptible_timeout(*q,
- kthread_should_stop() || freezing(current) ||
- dcc->discard_wake,
- msecs_to_jiffies(wait_ms));
- if (try_to_freeze())
- continue;
- if (f2fs_readonly(sbi->sb))
- continue;
- if (kthread_should_stop())
- return 0;
- if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
- wait_ms = dpolicy.max_interval;
- continue;
- }
-
- if (dcc->discard_wake)
- dcc->discard_wake = 0;
-
- down_read(&GC_I(sbi)->gc_rwsem);
- if (GC_I(sbi)->f2fs_gc_task && GC_I(sbi)->gc_urgent)
- init_discard_policy(&dpolicy, DPOLICY_FORCE, 1);
- up_read(&GC_I(sbi)->gc_rwsem);
-
- sb_start_intwrite(sbi->sb);
-
- issued = __issue_discard_cmd(sbi, &dpolicy);
- if (issued > 0) {
- __wait_all_discard_cmd(sbi, &dpolicy);
- wait_ms = dpolicy.min_interval;
- } else if (issued == -1){
- wait_ms = dpolicy.mid_interval;
- } else {
- wait_ms = dpolicy.max_interval;
- }
-
- sb_end_intwrite(sbi->sb);
-
- } while (!kthread_should_stop());
- return 0;
-}
-
-#ifdef CONFIG_BLK_DEV_ZONED
-static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t blkstart, block_t blklen)
-{
- sector_t sector, nr_sects;
- block_t lblkstart = blkstart;
- int devi = 0;
-
- if (sbi->s_ndevs) {
- devi = f2fs_target_device_index(sbi, blkstart);
- blkstart -= FDEV(devi).start_blk;
- }
-
- /*
- * We need to know the type of the zone: for conventional zones,
- * use regular discard if the drive supports it. For sequential
- * zones, reset the zone write pointer.
- */
- switch (get_blkz_type(sbi, bdev, blkstart)) {
-
- case BLK_ZONE_TYPE_CONVENTIONAL:
- if (!blk_queue_discard(bdev_get_queue(bdev)))
- return 0;
- return __queue_discard_cmd(sbi, bdev, lblkstart, blklen);
- case BLK_ZONE_TYPE_SEQWRITE_REQ:
- case BLK_ZONE_TYPE_SEQWRITE_PREF:
- sector = SECTOR_FROM_BLOCK(blkstart);
- nr_sects = SECTOR_FROM_BLOCK(blklen);
-
- if (sector & (bdev_zone_sectors(bdev) - 1) ||
- nr_sects != bdev_zone_sectors(bdev)) {
- f2fs_msg(sbi->sb, KERN_INFO,
- "(%d) %s: Unaligned discard attempted (block %x + %x)",
- devi, sbi->s_ndevs ? FDEV(devi).path: "",
- blkstart, blklen);
- return -EIO;
- }
- trace_f2fs_issue_reset_zone(bdev, blkstart);
- return blkdev_reset_zones(bdev, sector,
- nr_sects, GFP_NOFS);
- default:
- /* Unknown zone type: broken device ? */
- return -EIO;
- }
-}
-#endif
-
-static int __issue_discard_async(struct f2fs_sb_info *sbi,
- struct block_device *bdev, block_t blkstart, block_t blklen)
-{
-#ifdef CONFIG_BLK_DEV_ZONED
- if (f2fs_sb_has_blkzoned(sbi->sb) &&
- bdev_zoned_model(bdev) != BLK_ZONED_NONE)
- return __f2fs_issue_discard_zone(sbi, bdev, blkstart, blklen);
-#endif
- return __queue_discard_cmd(sbi, bdev, blkstart, blklen);
-}
-
-static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
- block_t blkstart, block_t blklen)
-{
- sector_t start = blkstart, len = 0;
- struct block_device *bdev;
- struct seg_entry *se;
- unsigned int offset;
- block_t i;
- int err = 0;
-
- bdev = f2fs_target_device(sbi, blkstart, NULL);
-
- for (i = blkstart; i < blkstart + blklen; i++, len++) {
- if (i != start) {
- struct block_device *bdev2 =
- f2fs_target_device(sbi, i, NULL);
-
- if (bdev2 != bdev) {
- err = __issue_discard_async(sbi, bdev,
- start, len);
- if (err)
- return err;
- bdev = bdev2;
- start = i;
- len = 0;
- }
- }
-
- se = get_seg_entry(sbi, GET_SEGNO(sbi, i));
- offset = GET_BLKOFF_FROM_SEG0(sbi, i);
-
- if (!f2fs_test_and_set_bit(offset, se->discard_map))
- sbi->discard_blks--;
- }
-
- if (len)
- err = __issue_discard_async(sbi, bdev, start, len);
- return err;
-}
-
-static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
- bool check_only)
-{
- int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
- int max_blocks = sbi->blocks_per_seg;
- struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
- unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
- unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
- unsigned long *discard_map = (unsigned long *)se->discard_map;
- unsigned long *dmap = SIT_I(sbi)->tmp_map;
- unsigned int start = 0, end = -1;
- bool force = (cpc->reason & CP_DISCARD);
- struct discard_entry *de = NULL;
- struct list_head *head = &SM_I(sbi)->dcc_info->entry_list;
- int i;
-
- if (se->valid_blocks == max_blocks || !f2fs_discard_en(sbi))
- return false;
-
- if (!force) {
- if (!test_opt(sbi, DISCARD) || !se->valid_blocks ||
- SM_I(sbi)->dcc_info->nr_discards >=
- SM_I(sbi)->dcc_info->max_discards)
- return false;
- }
-
- /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
- for (i = 0; i < entries; i++)
- dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
- (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
-
- while (force || SM_I(sbi)->dcc_info->nr_discards <=
- SM_I(sbi)->dcc_info->max_discards) {
- start = __find_rev_next_bit(dmap, max_blocks, end + 1);
- if (start >= max_blocks)
- break;
-
- end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
- if (force && start && end != max_blocks
- && (end - start) < cpc->trim_minlen)
- continue;
-
- if (check_only)
- return true;
-
- if (!de) {
- de = f2fs_kmem_cache_alloc(discard_entry_slab,
- GFP_F2FS_ZERO);
- de->start_blkaddr = START_BLOCK(sbi, cpc->trim_start);
- list_add_tail(&de->list, head);
- }
-
- for (i = start; i < end; i++)
- __set_bit_le(i, (void *)de->discard_map);
-
- SM_I(sbi)->dcc_info->nr_discards += end - start;
- }
- return false;
-}
-
-void release_discard_addr(struct discard_entry *entry)
-{
- list_del(&entry->list);
- kmem_cache_free(discard_entry_slab, entry);
-}
-
-void release_discard_addrs(struct f2fs_sb_info *sbi)
-{
- struct list_head *head = &(SM_I(sbi)->dcc_info->entry_list);
- struct discard_entry *entry, *this;
-
- /* drop caches */
- list_for_each_entry_safe(entry, this, head, list)
- release_discard_addr(entry);
-}
-
/*
* Should call clear_prefree_segments after checkpoint is done.
*/
@@ -1729,94 +908,6 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc)
wake_up_discard_thread(sbi, false);
}

-void init_discard_policy(struct discard_policy *dpolicy,
- int discard_type, unsigned int granularity)
-{
- /* common policy */
- dpolicy->type = discard_type;
- dpolicy->sync = true;
- dpolicy->granularity = granularity;
-
- dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
- dpolicy->io_aware_gran = MAX_PLIST_NUM;
-
- if (discard_type == DPOLICY_BG) {
- dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
- dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
- dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
- dpolicy->io_aware = true;
- dpolicy->sync = false;
- } else if (discard_type == DPOLICY_FORCE) {
- dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
- dpolicy->mid_interval = DEF_MID_DISCARD_ISSUE_TIME;
- dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
- dpolicy->io_aware = false;
- } else if (discard_type == DPOLICY_FSTRIM) {
- dpolicy->io_aware = false;
- } else if (discard_type == DPOLICY_UMOUNT) {
- dpolicy->max_requests = UINT_MAX;
- dpolicy->io_aware = false;
- }
-}
-
-static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
-{
- dev_t dev = sbi->sb->s_bdev->bd_dev;
- struct discard_cmd_control *dcc;
- int err = 0, i;
-
- if (SM_I(sbi)->dcc_info) {
- dcc = SM_I(sbi)->dcc_info;
- goto init_thread;
- }
-
- dcc = f2fs_kzalloc(sbi, sizeof(struct discard_cmd_control), GFP_KERNEL);
- if (!dcc)
- return -ENOMEM;
-
- dcc->discard_granularity = DEFAULT_DISCARD_GRANULARITY;
- INIT_LIST_HEAD(&dcc->entry_list);
- for (i = 0; i < MAX_PLIST_NUM; i++)
- INIT_LIST_HEAD(&dcc->pend_list[i]);
- INIT_LIST_HEAD(&dcc->wait_list);
- INIT_LIST_HEAD(&dcc->fstrim_list);
- mutex_init(&dcc->cmd_lock);
- atomic_set(&dcc->issued_discard, 0);
- atomic_set(&dcc->issing_discard, 0);
- atomic_set(&dcc->discard_cmd_cnt, 0);
- dcc->nr_discards = 0;
- dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
- dcc->undiscard_blks = 0;
- dcc->root = RB_ROOT;
-
- init_waitqueue_head(&dcc->discard_wait_queue);
- SM_I(sbi)->dcc_info = dcc;
-init_thread:
- dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
- "f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
- if (IS_ERR(dcc->f2fs_issue_discard)) {
- err = PTR_ERR(dcc->f2fs_issue_discard);
- kfree(dcc);
- SM_I(sbi)->dcc_info = NULL;
- return err;
- }
-
- return err;
-}
-
-static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
-{
- struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
-
- if (!dcc)
- return;
-
- stop_discard_thread(sbi);
-
- kfree(dcc);
- SM_I(sbi)->dcc_info = NULL;
-}
-
static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
{
struct sit_info *sit_i = SIT_I(sbi);
@@ -2399,60 +1490,6 @@ bool exist_trim_candidates(struct f2fs_sb_info *sbi, struct cp_control *cpc)
return has_candidate;
}

-int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
-{
- __u64 start = F2FS_BYTES_TO_BLK(range->start);
- __u64 end = start + F2FS_BYTES_TO_BLK(range->len) - 1;
- unsigned int start_segno, end_segno;
- block_t start_block, end_block;
- struct cp_control cpc;
- struct discard_policy dpolicy;
- unsigned long long trimmed = 0;
- int err = 0;
-
- if (start >= MAX_BLKADDR(sbi) || range->len < sbi->blocksize)
- return -EINVAL;
-
- if (end <= MAIN_BLKADDR(sbi))
- return -EINVAL;
-
- if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
- f2fs_msg(sbi->sb, KERN_WARNING,
- "Found FS corruption, run fsck to fix.");
- return -EIO;
- }
-
- /* start/end segment number in main_area */
- start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
- end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
- GET_SEGNO(sbi, end);
-
- cpc.reason = CP_DISCARD;
- cpc.trim_minlen = max_t(__u64, 1, F2FS_BYTES_TO_BLK(range->minlen));
- cpc.trim_start = start_segno;
- cpc.trim_end = end_segno;
-
- if (sbi->discard_blks == 0)
- goto out;
-
- mutex_lock(&sbi->gc_mutex);
- err = write_checkpoint(sbi, &cpc);
- mutex_unlock(&sbi->gc_mutex);
- if (err)
- goto out;
-
- start_block = START_BLOCK(sbi, start_segno);
- end_block = START_BLOCK(sbi, end_segno + 1);
-
- init_discard_policy(&dpolicy, DPOLICY_FSTRIM, cpc.trim_minlen);
- __issue_discard_cmd_range(sbi, &dpolicy, start_block, end_block);
- trimmed = __wait_discard_cmd_range(sbi, &dpolicy,
- start_block, end_block);
-out:
- range->len = F2FS_BLK_TO_BYTES(trimmed);
- return err;
-}
-
static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
@@ -3993,30 +3030,6 @@ void destroy_segment_manager(struct f2fs_sb_info *sbi)
kfree(sm_info);
}

-int __init create_discard_caches(void)
-{
- discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
- sizeof(struct discard_entry));
- if (!discard_entry_slab)
- goto fail;
-
- discard_cmd_slab = f2fs_kmem_cache_create("discard_cmd",
- sizeof(struct discard_cmd));
- if (!discard_cmd_slab)
- goto destroy_discard_entry;
- return 0;
-destroy_discard_entry:
- kmem_cache_destroy(discard_entry_slab);
-fail:
- return -ENOMEM;
-}
-
-void destroy_discard_caches(void)
-{
- kmem_cache_destroy(discard_cmd_slab);
- kmem_cache_destroy(discard_entry_slab);
-}
-
int __init create_segment_manager_caches(void)
{
sit_entry_set_slab = f2fs_kmem_cache_create("sit_entry_set",
--
2.15.0.55.gc2ece9dc4de6
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