f2fs: introduce struct flush_cmd_control to wrap the flush_merge fields

Split the flush_merge fields from sm_i, and use the new struct flush_cmd_control
to wrap it, so that we can igonre these fileds if flush_merge is disable, and
it alse can the structs more neat.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 97da71d..fa0ec81 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -325,6 +325,15 @@ struct flush_cmd {
        int ret;
 };
 
+struct flush_cmd_control {
+       struct task_struct *f2fs_issue_flush;   /* flush thread */
+       wait_queue_head_t flush_wait_queue;     /* waiting queue for wake-up */
+       struct flush_cmd *issue_list;           /* list for command issue */
+       struct flush_cmd *dispatch_list;        /* list for command dispatch */
+       spinlock_t issue_lock;                  /* for issue list lock */
+       struct flush_cmd *issue_tail;           /* list tail of issue list */
+};
+
 struct f2fs_sm_info {
        struct sit_info *sit_info;              /* whole segment information */
        struct free_segmap_info *free_info;     /* free segment information */
@@ -355,12 +364,8 @@ struct f2fs_sm_info {
        unsigned int min_ipu_util;      /* in-place-update threshold */
 
        /* for flush command control */
-       struct task_struct *f2fs_issue_flush;   /* flush thread */
-       wait_queue_head_t flush_wait_queue;     /* waiting queue for wake-up */
-       struct flush_cmd *issue_list;           /* list for command issue */
-       struct flush_cmd *dispatch_list;        /* list for command dispatch */
-       spinlock_t issue_lock;                  /* for issue list lock */
-       struct flush_cmd *issue_tail;           /* list tail of issue list */
+       struct flush_cmd_control *cmd_control_info;
+
 };
 
 /*

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f6816e1..9ac4f86 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -200,20 +200,20 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 int issue_flush_thread(void *data)
 {
        struct f2fs_sb_info *sbi = data;
-       struct f2fs_sm_info *sm_i = SM_I(sbi);
-       wait_queue_head_t *q = &sm_i->flush_wait_queue;
+       struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
+       wait_queue_head_t *q = &fcc->flush_wait_queue;
 repeat:
        if (kthread_should_stop())
                return 0;
 
-       spin_lock(&sm_i->issue_lock);
-       if (sm_i->issue_list) {
-               sm_i->dispatch_list = sm_i->issue_list;
-               sm_i->issue_list = sm_i->issue_tail = NULL;
+       spin_lock(&fcc->issue_lock);
+       if (fcc->issue_list) {
+               fcc->dispatch_list = fcc->issue_list;
+               fcc->issue_list = fcc->issue_tail = NULL;
        }
-       spin_unlock(&sm_i->issue_lock);
+       spin_unlock(&fcc->issue_lock);
 
-       if (sm_i->dispatch_list) {
+       if (fcc->dispatch_list) {
                struct bio *bio = bio_alloc(GFP_NOIO, 0);
                struct flush_cmd *cmd, *next;
                int ret;
@@ -221,22 +221,23 @@ repeat:
                bio->bi_bdev = sbi->sb->s_bdev;
                ret = submit_bio_wait(WRITE_FLUSH, bio);
 
-               for (cmd = sm_i->dispatch_list; cmd; cmd = next) {
+               for (cmd = fcc->dispatch_list; cmd; cmd = next) {
                        cmd->ret = ret;
                        next = cmd->next;
                        complete(&cmd->wait);
                }
                bio_put(bio);
-               sm_i->dispatch_list = NULL;
+               fcc->dispatch_list = NULL;
        }
 
-       wait_event_interruptible(*q, kthread_should_stop() || sm_i->issue_list);
+       wait_event_interruptible(*q,
+                       kthread_should_stop() || fcc->issue_list);
        goto repeat;
 }
 
 int f2fs_issue_flush(struct f2fs_sb_info *sbi)
 {
-       struct f2fs_sm_info *sm_i = SM_I(sbi);
+       struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
        struct flush_cmd *cmd;
        int ret;
 
@@ -246,16 +247,16 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
        cmd = f2fs_kmem_cache_alloc(flush_cmd_slab, GFP_ATOMIC | __GFP_ZERO);
        init_completion(&cmd->wait);
 
-       spin_lock(&sm_i->issue_lock);
-       if (sm_i->issue_list)
-               sm_i->issue_tail->next = cmd;
+       spin_lock(&fcc->issue_lock);
+       if (fcc->issue_list)
+               fcc->issue_tail->next = cmd;
        else
-               sm_i->issue_list = cmd;
-       sm_i->issue_tail = cmd;
-       spin_unlock(&sm_i->issue_lock);
+               fcc->issue_list = cmd;
+       fcc->issue_tail = cmd;
+       spin_unlock(&fcc->issue_lock);
 
-       if (!sm_i->dispatch_list)
-               wake_up(&sm_i->flush_wait_queue);
+       if (!fcc->dispatch_list)
+               wake_up(&fcc->flush_wait_queue);
 
        wait_for_completion(&cmd->wait);
        ret = cmd->ret;
@@ -1873,12 +1874,22 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
        sm_info->max_discards = 0;
 
        if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
-               spin_lock_init(&sm_info->issue_lock);
-               init_waitqueue_head(&sm_info->flush_wait_queue);
-               sm_info->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
+               struct flush_cmd_control *fcc =
+                       kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
+
+               if (!fcc)
+                       return -ENOMEM;
+               spin_lock_init(&fcc->issue_lock);
+               init_waitqueue_head(&fcc->flush_wait_queue);
+
+               fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
                                "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
-               if (IS_ERR(sm_info->f2fs_issue_flush))
-                       return PTR_ERR(sm_info->f2fs_issue_flush);
+               if (IS_ERR(fcc->f2fs_issue_flush)) {
+                       err = PTR_ERR(fcc->f2fs_issue_flush);
+                       kfree(fcc);
+                       return err;
+               }
+               sm_info->cmd_control_info = fcc;
        }
 
        err = build_sit_info(sbi);
@@ -1987,10 +1998,14 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
 void destroy_segment_manager(struct f2fs_sb_info *sbi)
 {
        struct f2fs_sm_info *sm_info = SM_I(sbi);
+       struct flush_cmd_control *fcc;
+
        if (!sm_info)
                return;
-       if (sm_info->f2fs_issue_flush)
-               kthread_stop(sm_info->f2fs_issue_flush);
+       fcc = sm_info->cmd_control_info;
+       if (fcc && fcc->f2fs_issue_flush)
+               kthread_stop(fcc->f2fs_issue_flush);
+       kfree(fcc);
        destroy_dirty_segmap(sbi);
        destroy_curseg(sbi);
        destroy_free_segmap(sbi);

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bea642a..a7ed92e 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -641,29 +641,33 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
         * or if flush_merge is not passed in mount option.
         */
        if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
-               struct f2fs_sm_info *sm_info = sbi->sm_info;
-
-               if (sm_info->f2fs_issue_flush)
-                       kthread_stop(sm_info->f2fs_issue_flush);
-               sm_info->issue_list = sm_info->dispatch_list = NULL;
-               sm_info->f2fs_issue_flush = NULL;
-       } else if (test_opt(sbi, FLUSH_MERGE)) {
-               struct f2fs_sm_info *sm_info = sbi->sm_info;
-
-               if (!sm_info->f2fs_issue_flush) {
-                       dev_t dev = sbi->sb->s_bdev->bd_dev;
-
-                       spin_lock_init(&sm_info->issue_lock);
-                       init_waitqueue_head(&sm_info->flush_wait_queue);
-                       sm_info->f2fs_issue_flush =
-                               kthread_run(issue_flush_thread, sbi,
+               struct flush_cmd_control *fcc =
+                                       sbi->sm_info->cmd_control_info;
+
+               if (fcc && fcc->f2fs_issue_flush)
+                       kthread_stop(fcc->f2fs_issue_flush);
+               kfree(fcc);
+               sbi->sm_info->cmd_control_info = NULL;
+       } else if (test_opt(sbi, FLUSH_MERGE) &&
+                                       !sbi->sm_info->cmd_control_info) {
+               dev_t dev = sbi->sb->s_bdev->bd_dev;
+               struct flush_cmd_control *fcc =
+                       kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
+
+               if (!fcc) {
+                       err = -ENOMEM;
+                       goto restore_gc;
+               }
+               spin_lock_init(&fcc->issue_lock);
+               init_waitqueue_head(&fcc->flush_wait_queue);
+               fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
                                "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
-                       if (IS_ERR(sm_info->f2fs_issue_flush)) {
-                               err = PTR_ERR(sm_info->f2fs_issue_flush);
-                               sm_info->f2fs_issue_flush = NULL;
-                               goto restore_gc;
-                       }
+               if (IS_ERR(fcc->f2fs_issue_flush)) {
+                       err = PTR_ERR(fcc->f2fs_issue_flush);
+                       kfree(fcc);
+                       goto restore_gc;
                }
+               sbi->sm_info->cmd_control_info = fcc;
        }
 skip:
        /* Update the POSIXACL Flag */