f2fs: use spinlock rather than mutex for better speed

With the 2 previous changes, all the long time operations are moved out
of the protection region, so here we can use spinlock rather than mutex
(orphan_inode_mutex) for lower overhead.

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

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 681782c..4de0345 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -196,22 +196,22 @@ int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 {
        int err = 0;
 
-       mutex_lock(&sbi->orphan_inode_mutex);
+       spin_lock(&sbi->orphan_inode_lock);
        if (unlikely(sbi->n_orphans >= sbi->max_orphans))
                err = -ENOSPC;
        else
                sbi->n_orphans++;
-       mutex_unlock(&sbi->orphan_inode_mutex);
+       spin_unlock(&sbi->orphan_inode_lock);
 
        return err;
 }
 
 void release_orphan_inode(struct f2fs_sb_info *sbi)
 {
-       mutex_lock(&sbi->orphan_inode_mutex);
+       spin_lock(&sbi->orphan_inode_lock);
        f2fs_bug_on(sbi->n_orphans == 0);
        sbi->n_orphans--;
-       mutex_unlock(&sbi->orphan_inode_mutex);
+       spin_unlock(&sbi->orphan_inode_lock);
 }
 
 void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@@ -222,12 +222,12 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
        new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
        new->ino = ino;
 
-       mutex_lock(&sbi->orphan_inode_mutex);
+       spin_lock(&sbi->orphan_inode_lock);
        head = &sbi->orphan_inode_list;
        list_for_each(this, head) {
                orphan = list_entry(this, struct orphan_inode_entry, list);
                if (orphan->ino == ino) {
-                       mutex_unlock(&sbi->orphan_inode_mutex);
+                       spin_unlock(&sbi->orphan_inode_lock);
                        kmem_cache_free(orphan_entry_slab, new);
                        return;
                }
@@ -242,7 +242,7 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
                list_add(&new->list, this->prev);
        else
                list_add_tail(&new->list, head);
-       mutex_unlock(&sbi->orphan_inode_mutex);
+       spin_unlock(&sbi->orphan_inode_lock);
 }
 
 void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@@ -250,7 +250,7 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
        struct list_head *head;
        struct orphan_inode_entry *orphan;
 
-       mutex_lock(&sbi->orphan_inode_mutex);
+       spin_lock(&sbi->orphan_inode_lock);
        head = &sbi->orphan_inode_list;
        list_for_each_entry(orphan, head, list) {
                if (orphan->ino == ino) {
@@ -261,7 +261,7 @@ void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
                        break;
                }
        }
-       mutex_unlock(&sbi->orphan_inode_mutex);
+       spin_unlock(&sbi->orphan_inode_lock);
 }
 
 static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
@@ -318,7 +318,7 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
                pages[index] = grab_meta_page(sbi, start_blk + index);
 
        index = 1;
-       mutex_lock(&sbi->orphan_inode_mutex);
+       spin_lock(&sbi->orphan_inode_lock);
        head = &sbi->orphan_inode_list;
 
        /* loop for each orphan inode entry and write them in Jornal block */
@@ -357,7 +357,7 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
                f2fs_put_page(page, 1);
        }
 
-       mutex_unlock(&sbi->orphan_inode_mutex);
+       spin_unlock(&sbi->orphan_inode_lock);
 }
 
 static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
@@ -828,7 +828,7 @@ void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
 
 void init_orphan_info(struct f2fs_sb_info *sbi)
 {
-       mutex_init(&sbi->orphan_inode_mutex);
+       spin_lock_init(&sbi->orphan_inode_lock);
        INIT_LIST_HEAD(&sbi->orphan_inode_list);
        sbi->n_orphans = 0;
        /*

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8466b5e..ee304fb 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -412,7 +412,7 @@ struct f2fs_sb_info {
 
        /* for orphan inode management */
        struct list_head orphan_inode_list;     /* orphan inode list */
-       struct mutex orphan_inode_mutex;        /* for orphan inode list */
+       spinlock_t orphan_inode_lock;           /* for orphan inode list */
        unsigned int n_orphans;                 /* # of orphan inodes */
        unsigned int max_orphans;               /* max orphan inodes */