> -----Original Message----- > From: Chao Yu [mailto:chao2.yu@xxxxxxxxxxx] > Sent: Thursday, December 05, 2013 9:55 AM > To: ??? > Cc: linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Subject: [f2fs-dev] [PATCH 3/3] f2fs: introduce f2fs_cache_node_page() to add page into node_inode cache > > This patch introduces f2fs_cache_node_page(), in this function, page which is > readed ahead will be copy to node_inode's mapping cache. > It will avoid rereading these node pages. > > Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx> Suggested-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx> I miss that, my mistake. > --- > fs/f2fs/node.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c > index 099f06f..5e2588f 100644 > --- a/fs/f2fs/node.c > +++ b/fs/f2fs/node.c > @@ -1600,6 +1600,34 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages, > return 0; > } > > +/* > + * f2fs_cache_node_page() copy updated page data to node_inode cache page. > + */ > +void f2fs_cache_node_page(struct f2fs_sb_info *sbi, struct page *page, > + nid_t nid) > +{ > + struct address_space *mapping = sbi->node_inode->i_mapping; > + struct page *npage; > + > + npage = find_get_page(mapping, nid); > + if (npage && PageUptodate(npage)) { > + f2fs_put_page(npage, 0); > + return; > + } > + f2fs_put_page(npage, 0); > + > + npage = grab_cache_page(mapping, nid); > + if (!npage) > + return; > + > + memcpy(page_address(npage), page_address(page), PAGE_CACHE_SIZE); > + > + SetPageUptodate(npage); > + f2fs_put_page(npage, 1); > + > + return; > +} > + > int restore_node_summary(struct f2fs_sb_info *sbi, > unsigned int segno, struct f2fs_summary_block *sum) > { > @@ -1633,6 +1661,8 @@ int restore_node_summary(struct f2fs_sb_info *sbi, > sum_entry->version = 0; > sum_entry->ofs_in_node = 0; > sum_entry++; > + f2fs_cache_node_page(sbi, page, > + le32_to_cpu(rn->footer.nid)); > } else { > err = -EIO; > } > -- > 1.7.9.5 > > > ------------------------------------------------------------------------------ > Sponsored by Intel(R) XDK > Develop, test and display web and hybrid apps with a single code base. > Download it for free now! > http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
