f2fs: use meta_inode cache to improve roll-forward speed

Previously, all the dnode pages should be read during the roll-forward recovery.
Even worsely, whole the chain was traversed twice.
This patch removes that redundant and costly read operations by using page cache
of meta_inode and readahead function as well.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 28 insertions, 5 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index d44d287cdae9..a1786d680906 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -72,7 +72,23 @@ out:
         return page;
 }
 
-static inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
+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(max_hw_blocks(sbi)), META_POR);
+        return get_meta_page(sbi, index);
+}
+
+static inline block_t get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
 {
         switch (type) {
         case META_NAT:
@@ -82,6 +98,8 @@ static inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
         case META_SSA:
         case META_CP:
                 return 0;
+        case META_POR:
+                return SM_I(sbi)->seg0_blkaddr + TOTAL_BLKS(sbi);
         default:
                 BUG();
         }
@@ -90,12 +108,13 @@ static inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
 /*
  * Readahead CP/NAT/SIT/SSA pages
  */
-int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type)
+int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type)
 {
         block_t prev_blk_addr = 0;
         struct page *page;
-        int blkno = start;
-        int max_blks = get_max_meta_blks(sbi, type);
+        block_t blkno = start;
+        block_t max_blks = get_max_meta_blks(sbi, type);
+        block_t min_blks = SM_I(sbi)->seg0_blkaddr;
 
         struct f2fs_io_info fio = {
                 .type = META,
@@ -125,7 +144,11 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type)
                         break;
                 case META_SSA:
                 case META_CP:
-                        /* get ssa/cp block addr */
+                case META_POR:
+                        if (unlikely(blkno >= max_blks))
+                                goto out;
+                        if (unlikely(blkno < min_blks))
+                                goto out;
                         blk_addr = blkno;
                         break;
                 default: