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f2fs: avoid to ra unneeded blocks in recover flow 

To improve recovery speed, f2fs try to readahead many contiguous blocks in warm
node segment, but for most time, abnormal power-off do not occur frequently, so
when mount a normal power-off f2fs image, by contrary ra so many blocks and then
invalid them will hurt the performance of mount.
It's better to just ra the first next-block for normal condition.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2014-12-08 15:02:52 +08:00 committed by Jaegeuk Kim
parent 66b00c1867
commit 635aee1fef
3 changed files with 23 additions and 18 deletions
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29
fs/f2fs/checkpoint.c
View File

@ -72,21 +72,6 @@ out:
return page; return page;
} }
struct page *get_meta_page_ra(struct f2fs_sb_info *sbi, pgoff_t index)
{
bool readahead = false;
struct page *page;
page = find_get_page(META_MAPPING(sbi), index);
if (!page || (page && !PageUptodate(page)))
readahead = true;
f2fs_put_page(page, 0);
if (readahead)
ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
return get_meta_page(sbi, index);
}
static inline bool is_valid_blkaddr(struct f2fs_sb_info *sbi, static inline bool is_valid_blkaddr(struct f2fs_sb_info *sbi,
block_t blkaddr, int type) block_t blkaddr, int type)
{ {
@ -181,6 +166,20 @@ out:
return blkno - start; return blkno - start;
} }
void ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index)
{
struct page *page;
bool readahead = false;
page = find_get_page(META_MAPPING(sbi), index);
if (!page || (page && !PageUptodate(page)))
readahead = true;
f2fs_put_page(page, 0);
if (readahead)
ra_meta_pages(sbi, index, MAX_BIO_BLOCKS(sbi), META_POR);
}
static int f2fs_write_meta_page(struct page *page, static int f2fs_write_meta_page(struct page *page,
struct writeback_control *wbc) struct writeback_control *wbc)
{ {

2
fs/f2fs/f2fs.h
View File

@ -1431,8 +1431,8 @@ void destroy_segment_manager_caches(void);
*/ */
struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t); struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t); struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t);
struct page *get_meta_page_ra(struct f2fs_sb_info *, pgoff_t);
int ra_meta_pages(struct f2fs_sb_info *, block_t, int, int); int ra_meta_pages(struct f2fs_sb_info *, block_t, int, int);
void ra_meta_pages_cond(struct f2fs_sb_info *, pgoff_t);
long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long); long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long);
void add_dirty_inode(struct f2fs_sb_info *, nid_t, int type); void add_dirty_inode(struct f2fs_sb_info *, nid_t, int type);
void remove_dirty_inode(struct f2fs_sb_info *, nid_t, int type); void remove_dirty_inode(struct f2fs_sb_info *, nid_t, int type);

10
fs/f2fs/recovery.c
View File

@ -170,13 +170,15 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
ra_meta_pages(sbi, blkaddr, 1, META_POR);
while (1) { while (1) {
struct fsync_inode_entry *entry; struct fsync_inode_entry *entry;
if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi)) if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
return 0; return 0;
page = get_meta_page_ra(sbi, blkaddr); page = get_meta_page(sbi, blkaddr);
if (cp_ver != cpver_of_node(page)) if (cp_ver != cpver_of_node(page))
break; break;
@ -227,6 +229,8 @@ next:
/* check next segment */ /* check next segment */
blkaddr = next_blkaddr_of_node(page); blkaddr = next_blkaddr_of_node(page);
f2fs_put_page(page, 1); f2fs_put_page(page, 1);
ra_meta_pages_cond(sbi, blkaddr);
} }
f2fs_put_page(page, 1); f2fs_put_page(page, 1);
return err; return err;
@ -436,7 +440,9 @@ static int recover_data(struct f2fs_sb_info *sbi,
if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi)) if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
break; break;
page = get_meta_page_ra(sbi, blkaddr); ra_meta_pages_cond(sbi, blkaddr);
page = get_meta_page(sbi, blkaddr);
if (cp_ver != cpver_of_node(page)) { if (cp_ver != cpver_of_node(page)) {
f2fs_put_page(page, 1); f2fs_put_page(page, 1);