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f2fs: use atomic type for node count in extent tree 

1. rename field in struct extent_tree from count to node_cnt for
   readability.
2. alter to use atomic type for node_cnt.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2016-01-08 20:22:52 +08:00 committed by Jaegeuk Kim
parent da5af127a1
commit 68e3538510
2 changed files with 10 additions and 9 deletions
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17
fs/f2fs/extent_cache.c
View File

@ -36,7 +36,7 @@ static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
rb_link_node(&en->rb_node, parent, p);
rb_insert_color(&en->rb_node, &et->root);
et->count++;
atomic_inc(&et->node_cnt);
atomic_inc(&sbi->total_ext_node);
return en;
}
@ -45,7 +45,7 @@ static void __detach_extent_node(struct f2fs_sb_info *sbi,
struct extent_tree *et, struct extent_node *en)
{
rb_erase(&en->rb_node, &et->root);
et->count--;
atomic_dec(&et->node_cnt);
atomic_dec(&sbi->total_ext_node);
if (et->cached_en == en)
@ -69,7 +69,7 @@ static struct extent_tree *__grab_extent_tree(struct inode *inode)
et->cached_en = NULL;
rwlock_init(&et->lock);
INIT_LIST_HEAD(&et->list);
et->count = 0;
atomic_set(&et->node_cnt, 0);
atomic_inc(&sbi->total_ext_tree);
} else {
atomic_dec(&sbi->total_zombie_tree);
@ -133,7 +133,7 @@ static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi,
{
struct rb_node *node, *next;
struct extent_node *en;
unsigned int count = et->count;
unsigned int count = atomic_read(&et->node_cnt);
node = rb_first(&et->root);
while (node) {
@ -154,7 +154,7 @@ static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi,
node = next;
}
return count - et->count;
return count - atomic_read(&et->node_cnt);
}
static void __drop_largest_extent(struct inode *inode,
@ -192,7 +192,7 @@ bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
le32_to_cpu(i_ext->blk), le32_to_cpu(i_ext->len));
write_lock(&et->lock);
if (et->count)
if (atomic_read(&et->node_cnt))
goto out;
en = __init_extent_tree(sbi, et, &ei);
@ -660,7 +660,8 @@ void f2fs_destroy_extent_tree(struct inode *inode)
if (!et)
return;
if (inode->i_nlink && !is_bad_inode(inode) && et->count) {
if (inode->i_nlink && !is_bad_inode(inode) &&
atomic_read(&et->node_cnt)) {
down_write(&sbi->extent_tree_lock);
list_add_tail(&et->list, &sbi->zombie_list);
atomic_inc(&sbi->total_zombie_tree);
@ -673,7 +674,7 @@ void f2fs_destroy_extent_tree(struct inode *inode)
/* delete extent tree entry in radix tree */
down_write(&sbi->extent_tree_lock);
f2fs_bug_on(sbi, et->count);
f2fs_bug_on(sbi, atomic_read(&et->node_cnt));
radix_tree_delete(&sbi->extent_tree_root, inode->i_ino);
kmem_cache_free(extent_tree_slab, et);
atomic_dec(&sbi->total_ext_tree);

2
fs/f2fs/f2fs.h
View File

@ -361,7 +361,7 @@ struct extent_tree {
struct extent_info largest; /* largested extent info */
struct list_head list; /* to be used by sbi->zombie_list */
rwlock_t lock; /* protect extent info rb-tree */
unsigned int count; /* # of extent node in rb-tree*/
atomic_t node_cnt; /* # of extent node in rb-tree*/
};
/*