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f2fs: use radix_tree for ino management 

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

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-07-24 18:15:17 -07:00
parent 6451e041c8
commit 39efac41fb
2 changed files with 30 additions and 24 deletions
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53
fs/f2fs/checkpoint.c
View File

@ -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) {
spin_unlock(&sbi->ino_lock[type]);
kmem_cache_free(ino_entry_slab, new);
return;
}
if (e->ino > ino)
break;
}
/* add new entry into list which is sorted by inode number */
list_add_tail(&new->list, &e->list);
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]);
goto retry;
}
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;
list_add_tail(&e->list, &sbi->ino_list[type]);
}
spin_unlock(&sbi->ino_lock[type]);
}
@ -310,14 +313,15 @@ 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) {
list_del(&e->list);
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]);
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]);
}

1
fs/f2fs/f2fs.h
View File

@ -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 */