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Message-ID: <20180426160819.GI68594@jaegeuk-macbookpro.roam.corp.google.com>
Date: Thu, 26 Apr 2018 10:08:19 -0600
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH 3/3] f2fs: maintain discard interface separately
On 04/25, Chao Yu wrote:
> This patch adds a new file discard.c to maintain discard related
> function separately.
I don't think we need this at all.
Thanks,
>
> 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@...wei.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@...nel.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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