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Date: Mon, 22 Sep 2014 17:22:27 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: 'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH 08/10] f2fs: remove redundant operation during
roll-forward recovery
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Monday, September 15, 2014 6:14 AM
> To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> linux-f2fs-devel@...ts.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 08/10] f2fs: remove redundant operation during roll-forward recovery
>
> If same data is updated multiple times, we don't need to redo whole the
> operations.
> Let's just update the lastest one.
Reviewed-by: Chao Yu <chao2.yu@...sung.com>
And one comment as following.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> fs/f2fs/f2fs.h | 4 +++-
> fs/f2fs/recovery.c | 41 +++++++++++++++++------------------------
> 2 files changed, 20 insertions(+), 25 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 48d7d46..74dde99 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -137,7 +137,9 @@ struct discard_entry {
> struct fsync_inode_entry {
> struct list_head list; /* list head */
> struct inode *inode; /* vfs inode pointer */
> - block_t blkaddr; /* block address locating the last inode */
> + block_t blkaddr; /* block address locating the last fsync */
> + block_t last_dentry; /* block address locating the last dentry */
> + block_t last_inode; /* block address locating the last inode */
> };
>
> #define nats_in_cursum(sum) (le16_to_cpu(sum->n_nats))
> diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
> index 6f7fbfa..95d9dc9 100644
> --- a/fs/f2fs/recovery.c
> +++ b/fs/f2fs/recovery.c
> @@ -66,7 +66,7 @@ static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
> return NULL;
> }
>
> -static int recover_dentry(struct page *ipage, struct inode *inode)
> +static int recover_dentry(struct inode *inode, struct page *ipage)
> {
> struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
> nid_t pino = le32_to_cpu(raw_inode->i_pino);
> @@ -140,7 +140,7 @@ out:
> return err;
> }
>
> -static void __recover_inode(struct inode *inode, struct page *page)
> +static void recover_inode(struct inode *inode, struct page *page)
> {
> struct f2fs_inode *raw = F2FS_INODE(page);
>
> @@ -152,21 +152,9 @@ static void __recover_inode(struct inode *inode, struct page *page)
> inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
> inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
> inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
> -}
> -
> -static int recover_inode(struct inode *inode, struct page *node_page)
> -{
> - if (!IS_INODE(node_page))
> - return 0;
> -
> - __recover_inode(inode, node_page);
> -
> - if (is_dent_dnode(node_page))
> - return recover_dentry(node_page, inode);
>
> f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
> - ino_of_node(node_page), F2FS_INODE(node_page)->i_name);
> - return 0;
> + ino_of_node(page), F2FS_INODE(page)->i_name);
> }
>
> static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
> @@ -214,12 +202,11 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head
> *head)
> }
>
> /* add this fsync inode to the list */
> - entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
> + entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
> if (!entry) {
> err = -ENOMEM;
> break;
> }
> -
> /*
> * CP | dnode(F) | inode(DF)
> * For this case, we should not give up now.
> @@ -236,9 +223,11 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head
> *head)
> }
> entry->blkaddr = blkaddr;
>
> - err = recover_inode(entry->inode, page);
> - if (err && err != -ENOENT)
> - break;
> + if (IS_INODE(page)) {
> + entry->last_inode = blkaddr;
> + if (is_dent_dnode(page))
> + entry->last_dentry = blkaddr;
> + }
> next:
> /* check next segment */
> blkaddr = next_blkaddr_of_node(page);
> @@ -455,11 +444,15 @@ static int recover_data(struct f2fs_sb_info *sbi,
> /*
> * inode(x) | CP | inode(x) | dnode(F)
> * In this case, we can lose the latest inode(x).
> - * So, call __recover_inode for the inode update.
> + * So, call recover_inode for the inode update.
> */
> - if (IS_INODE(page))
> - __recover_inode(entry->inode, page);
> -
> + if (entry->last_inode == blkaddr)
> + recover_inode(entry->inode, page);
> + if (entry->last_dentry == blkaddr) {
> + err = recover_dentry(entry->inode, page);
> + if (err)
Need f2fs_put_page(page, 1);
> + break;
> + }
> err = do_recover_data(sbi, entry->inode, page, blkaddr);
> if (err)
> break;
> --
> 1.8.5.2 (Apple Git-48)
>
>
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