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f2fs: preserve extent info for extent cache

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This patch tries to preserve last extent info in extent tree cache into on-disk
inode, so this can help us to reuse the last extent info next time for
performance.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-03-19 19:27:51 +08:00 committed by Jaegeuk Kim
parent 028a41e893
commit 0bdee48250
3 changed files with 62 additions and 0 deletions
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49
fs/f2fs/data.c
View File

@ -719,6 +719,55 @@ update_extent:
atomic_dec(&et->refcount);
}
void f2fs_preserve_extent_tree(struct inode *inode)
{
struct extent_tree *et;
struct extent_info *ext = &F2FS_I(inode)->ext;
bool sync = false;
if (!test_opt(F2FS_I_SB(inode), EXTENT_CACHE))
return;
et = __find_extent_tree(F2FS_I_SB(inode), inode->i_ino);
if (!et) {
if (ext->len) {
ext->len = 0;
update_inode_page(inode);
}
return;
}
read_lock(&et->lock);
if (et->count) {
struct extent_node *en;
if (et->cached_en) {
en = et->cached_en;
} else {
struct rb_node *node = rb_first(&et->root);
if (!node)
node = rb_last(&et->root);
en = rb_entry(node, struct extent_node, rb_node);
}
if (__is_extent_same(ext, &en->ei))
goto out;
*ext = en->ei;
sync = true;
} else if (ext->len) {
ext->len = 0;
sync = true;
}
out:
read_unlock(&et->lock);
atomic_dec(&et->refcount);
if (sync)
update_inode_page(inode);
}
void f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
{
struct extent_tree *treevec[EXT_TREE_VEC_SIZE];

8
fs/f2fs/f2fs.h
View File

@ -371,6 +371,13 @@ static inline void set_extent_info(struct extent_info *ei, unsigned int fofs,
ei->len = len;
}
static inline bool __is_extent_same(struct extent_info *ei1,
struct extent_info *ei2)
{
return (ei1->fofs == ei2->fofs && ei1->blk == ei2->blk &&
ei1->len == ei2->len);
}
static inline bool __is_extent_mergeable(struct extent_info *back,
struct extent_info *front)
{
@ -1598,6 +1605,7 @@ void f2fs_shrink_extent_tree(struct f2fs_sb_info *, int);
void f2fs_destroy_extent_tree(struct inode *);
void f2fs_init_extent_cache(struct inode *, struct f2fs_extent *);
void f2fs_update_extent_cache(struct dnode_of_data *);
void f2fs_preserve_extent_tree(struct inode *);
struct page *find_data_page(struct inode *, pgoff_t, bool);
struct page *get_lock_data_page(struct inode *, pgoff_t);
struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);

5
fs/f2fs/inode.c
View File

@ -343,7 +343,12 @@ void f2fs_evict_inode(struct inode *inode)
no_delete:
stat_dec_inline_dir(inode);
stat_dec_inline_inode(inode);
/* update extent info in inode */
if (inode->i_nlink)
f2fs_preserve_extent_tree(inode);
f2fs_destroy_extent_tree(inode);
invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
if (xnid)
invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);