Commit 39efac41 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: use radix_tree for ino management 



For better ino management, this patch replaces the data structure from list
to radix tree.

Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 6451e041

fs/f2fs/checkpoint.c

+27 −22
Original line number Diff line number Diff line
@@ -284,24 +284,27 @@ const struct address_space_operations f2fs_meta_aops = { 


static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)

{

	struct ino_entry *new, *e;



	new = f2fs_kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);

	new->ino = ino;



	struct ino_entry *e;

retry:

	spin_lock(&sbi->ino_lock[type]);

	list_for_each_entry(e, &sbi->ino_list[type], list) {

		if (e->ino == ino) {



	e = radix_tree_lookup(&sbi->ino_root[type], ino);

	if (!e) {

		e = kmem_cache_alloc(ino_entry_slab, GFP_ATOMIC);

		if (!e) {

			spin_unlock(&sbi->ino_lock[type]);

			kmem_cache_free(ino_entry_slab, new);

			return;

			goto retry;

		}

		if (e->ino > ino)

			break;

		if (radix_tree_insert(&sbi->ino_root[type], ino, e)) {

			spin_unlock(&sbi->ino_lock[type]);

			kmem_cache_free(ino_entry_slab, e);

			goto retry;

		}

		memset(e, 0, sizeof(struct ino_entry));

		e->ino = ino;



	/* add new entry into list which is sorted by inode number */

	list_add_tail(&new->list, &e->list);

		list_add_tail(&e->list, &sbi->ino_list[type]);

	}

	spin_unlock(&sbi->ino_lock[type]);

}
@@ -310,15 +313,16 @@ static void __remove_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type) 
	struct ino_entry *e;



	spin_lock(&sbi->ino_lock[type]);

	list_for_each_entry(e, &sbi->ino_list[type], list) {

		if (e->ino == ino) {

	e = radix_tree_lookup(&sbi->ino_root[type], ino);

	if (e) {

		list_del(&e->list);

		radix_tree_delete(&sbi->ino_root[type], ino);

		if (type == ORPHAN_INO)

			sbi->n_orphans--;

		spin_unlock(&sbi->ino_lock[type]);

		kmem_cache_free(ino_entry_slab, e);

		return;

	}

	}

	spin_unlock(&sbi->ino_lock[type]);

}
@@ -346,7 +350,7 @@ void release_orphan_inode(struct f2fs_sb_info *sbi) 


void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)

{

	/* add new orphan entry into list which is sorted by inode number */

	/* add new orphan ino entry into list */

	__add_ino_entry(sbi, ino, ORPHAN_INO);

}
@@ -943,6 +947,7 @@ void init_ino_entry_info(struct f2fs_sb_info *sbi) 
	int i;



	for (i = 0; i < MAX_INO_ENTRY; i++) {

		INIT_RADIX_TREE(&sbi->ino_root[i], GFP_ATOMIC);

		spin_lock_init(&sbi->ino_lock[i]);

		INIT_LIST_HEAD(&sbi->ino_list[i]);

	}

fs/f2fs/f2fs.h

+1 −0
Original line number Diff line number Diff line
@@ -456,6 +456,7 @@ struct f2fs_sb_info { 
	wait_queue_head_t cp_wait;



	/* for inode management */

	struct radix_tree_root ino_root[MAX_INO_ENTRY];	/* ino entry array */

	spinlock_t ino_lock[MAX_INO_ENTRY];		/* for ino entry lock */

	struct list_head ino_list[MAX_INO_ENTRY];	/* inode list head */