f2fs: use atomic variable for total_extent_tree

It would be better to use atomic variable for total_extent_tree.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index bb307e6..ed5dfcc 100644 (file)
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -38,7 +38,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
        si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree);
        si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree;
        si->total_ext = atomic64_read(&sbi->total_hit_ext);
-       si->ext_tree = sbi->total_ext_tree;
+       si->ext_tree = atomic_read(&sbi->total_ext_tree);
        si->ext_node = atomic_read(&sbi->total_ext_node);
        si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
        si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
@@ -193,7 +193,8 @@ get_cache:
        si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
        for (i = 0; i <= UPDATE_INO; i++)
                si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
-       si->cache_mem += sbi->total_ext_tree * sizeof(struct extent_tree);
+       si->cache_mem += atomic_read(&sbi->total_ext_tree) *
+                                               sizeof(struct extent_tree);
        si->cache_mem += atomic_read(&sbi->total_ext_node) *
                                                sizeof(struct extent_node);
 

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index e86e9f1..0e97d6a 100644 (file)
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -70,7 +70,7 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
                rwlock_init(&et->lock);
                atomic_set(&et->refcount, 0);
                et->count = 0;
-               sbi->total_ext_tree++;
+               atomic_inc(&sbi->total_ext_tree);
        }
        atomic_inc(&et->refcount);
        up_write(&sbi->extent_tree_lock);
@@ -570,7 +570,7 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
 
                                radix_tree_delete(root, et->ino);
                                kmem_cache_free(extent_tree_slab, et);
-                               sbi->total_ext_tree--;
+                               atomic_dec(&sbi->total_ext_tree);
                                tree_cnt++;
 
                                if (node_cnt + tree_cnt >= nr_shrink)
@@ -663,7 +663,7 @@ void f2fs_destroy_extent_tree(struct inode *inode)
        f2fs_bug_on(sbi, atomic_read(&et->refcount) || et->count);
        radix_tree_delete(&sbi->extent_tree_root, inode->i_ino);
        kmem_cache_free(extent_tree_slab, et);
-       sbi->total_ext_tree--;
+       atomic_dec(&sbi->total_ext_tree);
        up_write(&sbi->extent_tree_lock);
 
        F2FS_I(inode)->extent_tree = NULL;
@@ -715,7 +715,7 @@ void init_extent_cache_info(struct f2fs_sb_info *sbi)
        init_rwsem(&sbi->extent_tree_lock);
        INIT_LIST_HEAD(&sbi->extent_list);
        spin_lock_init(&sbi->extent_lock);
-       sbi->total_ext_tree = 0;
+       atomic_set(&sbi->total_ext_tree, 0);
        atomic_set(&sbi->total_ext_node, 0);
 }
 

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 19beabe..a7f6191 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -762,7 +762,7 @@ struct f2fs_sb_info {
        struct rw_semaphore extent_tree_lock;   /* locking extent radix tree */
        struct list_head extent_list;           /* lru list for shrinker */
        spinlock_t extent_lock;                 /* locking extent lru list */
-       int total_ext_tree;                     /* extent tree count */
+       atomic_t total_ext_tree;                /* extent tree count */
        atomic_t total_ext_node;                /* extent info count */
 
        /* basic filesystem units */

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d842b19..6cc8ac7 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -65,7 +65,8 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
                                sizeof(struct ino_entry)) >> PAGE_CACHE_SHIFT;
                res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
        } else if (type == EXTENT_CACHE) {
-               mem_size = (sbi->total_ext_tree * sizeof(struct extent_tree) +
+               mem_size = (atomic_read(&sbi->total_ext_tree) *
+                               sizeof(struct extent_tree) +
                                atomic_read(&sbi->total_ext_node) *
                                sizeof(struct extent_node)) >> PAGE_CACHE_SHIFT;
                res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);

diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
index da0d8e0..a11e099 100644 (file)
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -32,7 +32,8 @@ static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
 
 static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)
 {
-       return sbi->total_ext_tree + atomic_read(&sbi->total_ext_node);
+       return atomic_read(&sbi->total_ext_tree) +
+                               atomic_read(&sbi->total_ext_node);
 }
 
 unsigned long f2fs_shrink_count(struct shrinker *shrink,