f2fs: factor out discard command info into discard_cmd_control

This patch adds discard_cmd_control with the existing discarding controls.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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 @@ get_cache:
         /* 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 548e75d18ec1..90eb2b3645a3 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -189,6 +189,13 @@ 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 */
@@ -632,12 +639,6 @@ 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 */
-
         /* for batched trimming */
         unsigned int trim_sections;             /* # of sections to trim */
 
@@ -649,6 +650,9 @@ 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 fa30c117b4cc..a009f8a70c3d 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)) {
@@ -835,7 +837,7 @@ 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,
@@ -857,7 +859,8 @@ 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;
         }
 
@@ -866,7 +869,8 @@ 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;
@@ -886,7 +890,7 @@ 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 */
@@ -912,7 +916,7 @@ 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;
@@ -972,13 +976,47 @@ next:
                 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);
@@ -2708,11 +2746,6 @@ 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;
-
         sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;
 
         INIT_LIST_HEAD(&sm_info->sit_entry_set);
@@ -2723,6 +2756,10 @@ 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;
@@ -2844,6 +2881,7 @@ 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 e68cec492f06..921228189acd 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, batched_trim_sections, trim_sections);
 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);