f2fs: introduce __{find,grab}_extent_tree
This patch introduces __{find,grab}_extent_tree for reusing by following
patches.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 6492f88..67b3a99 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -394,6 +394,49 @@
et->cached_en = NULL;
}
+static struct extent_tree *__find_extent_tree(struct f2fs_sb_info *sbi,
+ nid_t ino)
+{
+ struct extent_tree *et;
+
+ down_read(&sbi->extent_tree_lock);
+ et = radix_tree_lookup(&sbi->extent_tree_root, ino);
+ if (!et) {
+ up_read(&sbi->extent_tree_lock);
+ return NULL;
+ }
+ atomic_inc(&et->refcount);
+ up_read(&sbi->extent_tree_lock);
+
+ return et;
+}
+
+static struct extent_tree *__grab_extent_tree(struct inode *inode)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct extent_tree *et;
+ nid_t ino = inode->i_ino;
+
+ down_write(&sbi->extent_tree_lock);
+ et = radix_tree_lookup(&sbi->extent_tree_root, ino);
+ if (!et) {
+ et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS);
+ f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et);
+ memset(et, 0, sizeof(struct extent_tree));
+ et->ino = ino;
+ et->root = RB_ROOT;
+ et->cached_en = NULL;
+ rwlock_init(&et->lock);
+ atomic_set(&et->refcount, 0);
+ et->count = 0;
+ sbi->total_ext_tree++;
+ }
+ atomic_inc(&et->refcount);
+ up_write(&sbi->extent_tree_lock);
+
+ return et;
+}
+
static struct extent_node *__lookup_extent_tree(struct extent_tree *et,
unsigned int fofs)
{
@@ -538,14 +581,9 @@
trace_f2fs_lookup_extent_tree_start(inode, pgofs);
- down_read(&sbi->extent_tree_lock);
- et = radix_tree_lookup(&sbi->extent_tree_root, inode->i_ino);
- if (!et) {
- up_read(&sbi->extent_tree_lock);
+ et = __find_extent_tree(sbi, inode->i_ino);
+ if (!et)
return false;
- }
- atomic_inc(&et->refcount);
- up_read(&sbi->extent_tree_lock);
read_lock(&et->lock);
en = __lookup_extent_tree(et, pgofs);
@@ -570,7 +608,6 @@
block_t blkaddr)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
- nid_t ino = inode->i_ino;
struct extent_tree *et;
struct extent_node *en = NULL, *en1 = NULL, *en2 = NULL, *en3 = NULL;
struct extent_node *den = NULL;
@@ -579,22 +616,7 @@
trace_f2fs_update_extent_tree(inode, fofs, blkaddr);
- down_write(&sbi->extent_tree_lock);
- et = radix_tree_lookup(&sbi->extent_tree_root, ino);
- if (!et) {
- et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS);
- f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et);
- memset(et, 0, sizeof(struct extent_tree));
- et->ino = ino;
- et->root = RB_ROOT;
- et->cached_en = NULL;
- rwlock_init(&et->lock);
- atomic_set(&et->refcount, 0);
- et->count = 0;
- sbi->total_ext_tree++;
- }
- atomic_inc(&et->refcount);
- up_write(&sbi->extent_tree_lock);
+ et = __grab_extent_tree(inode);
write_lock(&et->lock);
@@ -732,14 +754,9 @@
if (!test_opt(sbi, EXTENT_CACHE))
return;
- down_read(&sbi->extent_tree_lock);
- et = radix_tree_lookup(&sbi->extent_tree_root, inode->i_ino);
- if (!et) {
- up_read(&sbi->extent_tree_lock);
+ et = __find_extent_tree(sbi, inode->i_ino);
+ if (!et)
goto out;
- }
- atomic_inc(&et->refcount);
- up_read(&sbi->extent_tree_lock);
/* free all extent info belong to this extent tree */
write_lock(&et->lock);