[PATCH 4/6] f2fs: factor out discard command info into discard_cmd_control
From: Jaegeuk Kim
Date: Thu Jan 12 2017 - 17:44:29 EST
This patch adds discard_cmd_control with the existing discarding controls.
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/debug.c | 2 ++
fs/f2fs/f2fs.h | 16 ++++++++-----
fs/f2fs/segment.c | 68 +++++++++++++++++++++++++++++++++++++++++++------------
fs/f2fs/super.c | 5 +++-
4 files changed, 69 insertions(+), 22 deletions(-)
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index cd338ca24941..f9f6b0aeba02 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -196,6 +196,8 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
/* build merge flush thread */
if (SM_I(sbi)->fcc_info)
si->cache_mem += sizeof(struct flush_cmd_control);
+ if (SM_I(sbi)->dcc_info)
+ si->cache_mem += sizeof(struct discard_cmd_control);
/* free nids */
si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID_LIST] +
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a2850bf2a487..e7b403cbd70f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -185,6 +185,13 @@ struct discard_cmd {
struct bio *bio; /* bio */
};
+struct discard_cmd_control {
+ struct list_head discard_entry_list; /* 4KB discard entry list */
+ int nr_discards; /* # of discards in the list */
+ struct list_head discard_cmd_list; /* discard cmd list */
+ int max_discards; /* max. discards to be issued */
+};
+
/* for the list of fsync inodes, used only during recovery */
struct fsync_inode_entry {
struct list_head list; /* list head */
@@ -628,12 +635,6 @@ struct f2fs_sm_info {
/* a threshold to reclaim prefree segments */
unsigned int rec_prefree_segments;
- /* for small discard management */
- struct list_head discard_entry_list; /* 4KB discard entry list */
- struct list_head discard_cmd_list; /* discard cmd list */
- int nr_discards; /* # of discards in the list */
- int max_discards; /* max. discards to be issued */
-
struct list_head sit_entry_set; /* sit entry set list */
unsigned int ipu_policy; /* in-place-update policy */
@@ -642,6 +643,9 @@ struct f2fs_sm_info {
/* for flush command control */
struct flush_cmd_control *fcc_info;
+
+ /* for discard command control */
+ struct discard_cmd_control *dcc_info;
};
/*
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e6f3c6db7616..e3bec31de961 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -631,7 +631,8 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
static struct discard_cmd *__add_discard_cmd(struct f2fs_sb_info *sbi,
struct bio *bio, block_t lstart, block_t len)
{
- struct list_head *wait_list = &(SM_I(sbi)->discard_cmd_list);
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *cmd_list = &(dcc->discard_cmd_list);
struct discard_cmd *dc;
dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS);
@@ -640,7 +641,7 @@ static struct discard_cmd *__add_discard_cmd(struct f2fs_sb_info *sbi,
dc->lstart = lstart;
dc->len = len;
init_completion(&dc->wait);
- list_add_tail(&dc->list, wait_list);
+ list_add_tail(&dc->list, cmd_list);
return dc;
}
@@ -648,7 +649,8 @@ static struct discard_cmd *__add_discard_cmd(struct f2fs_sb_info *sbi,
/* 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 list_head *wait_list = &(SM_I(sbi)->discard_cmd_list);
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+ struct list_head *wait_list = &(dcc->discard_cmd_list);
struct discard_cmd *dc, *tmp;
list_for_each_entry_safe(dc, tmp, wait_list, list) {
@@ -817,7 +819,7 @@ static void __add_discard_entry(struct f2fs_sb_info *sbi,
struct cp_control *cpc, struct seg_entry *se,
unsigned int start, unsigned int end)
{
- struct list_head *head = &SM_I(sbi)->discard_entry_list;
+ struct list_head *head = &SM_I(sbi)->dcc_info->discard_entry_list;
struct discard_entry *new, *last;
if (!list_empty(head)) {
@@ -836,7 +838,7 @@ static void __add_discard_entry(struct f2fs_sb_info *sbi,
new->len = end - start;
list_add_tail(&new->list, head);
done:
- SM_I(sbi)->nr_discards += end - start;
+ SM_I(sbi)->dcc_info->nr_discards += end - start;
}
static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
@@ -858,7 +860,8 @@ static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
if (!force) {
if (!test_opt(sbi, DISCARD) || !se->valid_blocks ||
- SM_I(sbi)->nr_discards >= SM_I(sbi)->max_discards)
+ SM_I(sbi)->dcc_info->nr_discards >=
+ SM_I(sbi)->dcc_info->max_discards)
return false;
}
@@ -867,7 +870,8 @@ static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
dmap[i] = force ? ~ckpt_map[i] & ~discard_map[i] :
(cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
- while (force || SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
+ 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;
@@ -887,7 +891,7 @@ static bool add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc,
void release_discard_addrs(struct f2fs_sb_info *sbi)
{
- struct list_head *head = &(SM_I(sbi)->discard_entry_list);
+ struct list_head *head = &(SM_I(sbi)->dcc_info->discard_entry_list);
struct discard_entry *entry, *this;
/* drop caches */
@@ -913,7 +917,7 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
- struct list_head *head = &(SM_I(sbi)->discard_entry_list);
+ struct list_head *head = &(SM_I(sbi)->dcc_info->discard_entry_list);
struct discard_entry *entry, *this;
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
struct blk_plug plug;
@@ -973,13 +977,47 @@ void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc)
cpc->trimmed += entry->len;
skip:
list_del(&entry->list);
- SM_I(sbi)->nr_discards -= entry->len;
+ SM_I(sbi)->dcc_info->nr_discards -= entry->len;
kmem_cache_free(discard_entry_slab, entry);
}
blk_finish_plug(&plug);
}
+int create_discard_cmd_control(struct f2fs_sb_info *sbi)
+{
+ struct discard_cmd_control *dcc;
+ int err = 0;
+
+ if (SM_I(sbi)->dcc_info) {
+ dcc = SM_I(sbi)->dcc_info;
+ goto init_thread;
+ }
+
+ dcc = kzalloc(sizeof(struct discard_cmd_control), GFP_KERNEL);
+ if (!dcc)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dcc->discard_entry_list);
+ INIT_LIST_HEAD(&dcc->discard_cmd_list);
+ dcc->nr_discards = 0;
+ dcc->max_discards = 0;
+
+ SM_I(sbi)->dcc_info = dcc;
+init_thread:
+ return err;
+}
+
+void destroy_discard_cmd_control(struct f2fs_sb_info *sbi, bool free)
+{
+ struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
+ if (free) {
+ 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);
@@ -2693,11 +2731,6 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
- INIT_LIST_HEAD(&sm_info->discard_entry_list);
- INIT_LIST_HEAD(&sm_info->discard_cmd_list);
- sm_info->nr_discards = 0;
- sm_info->max_discards = 0;
-
INIT_LIST_HEAD(&sm_info->sit_entry_set);
if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
@@ -2706,6 +2739,10 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
return err;
}
+ err = create_discard_cmd_control(sbi);
+ if (err)
+ return err;
+
err = build_sit_info(sbi);
if (err)
return err;
@@ -2827,6 +2864,7 @@ void destroy_segment_manager(struct f2fs_sb_info *sbi)
if (!sm_info)
return;
destroy_flush_cmd_control(sbi, true);
+ destroy_discard_cmd_control(sbi, true);
destroy_dirty_segmap(sbi);
destroy_curseg(sbi);
destroy_free_segmap(sbi);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 37d40d8aa9c4..2ddd2dc50b08 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -145,6 +145,7 @@ static match_table_t f2fs_tokens = {
enum {
GC_THREAD, /* struct f2fs_gc_thread */
SM_INFO, /* struct f2fs_sm_info */
+ DCC_INFO, /* struct discard_cmd_control */
NM_INFO, /* struct f2fs_nm_info */
F2FS_SBI, /* struct f2fs_sb_info */
#ifdef CONFIG_F2FS_FAULT_INJECTION
@@ -168,6 +169,8 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
return (unsigned char *)sbi->gc_thread;
else if (struct_type == SM_INFO)
return (unsigned char *)SM_I(sbi);
+ else if (struct_type == DCC_INFO)
+ return (unsigned char *)SM_I(sbi)->dcc_info;
else if (struct_type == NM_INFO)
return (unsigned char *)NM_I(sbi);
else if (struct_type == F2FS_SBI)
@@ -283,7 +286,7 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
-F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
+F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
--
2.11.0