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author | Chao Yu <chao2.yu@samsung.com> | 2015-03-19 12:27:51 +0100 |
---|---|---|
committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-04-11 00:08:51 +0200 |
commit | 0bdee482509fe8c3cf0e66231ed37b8e70954093 (patch) | |
tree | 2477ba4cbcefcbf2fce8e860e1d7e70c6aafa524 /fs/f2fs | |
parent | f2fs: initialize extent tree with on-disk extent info of inode (diff) | |
download | linux-0bdee482509fe8c3cf0e66231ed37b8e70954093.tar.xz linux-0bdee482509fe8c3cf0e66231ed37b8e70954093.zip |
f2fs: preserve extent info for extent cache
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>
Diffstat (limited to 'fs/f2fs')
-rw-r--r-- | fs/f2fs/data.c | 49 | ||||
-rw-r--r-- | fs/f2fs/f2fs.h | 8 | ||||
-rw-r--r-- | fs/f2fs/inode.c | 5 |
3 files changed, 62 insertions, 0 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index e3be4be3a6d8..8a940e518be8 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -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]; diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 431b4af693e5..0be198339c3b 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -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); diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 9e64d3efb2d2..07237ac2935e 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -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); |