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Date: Tue, 05 Jan 2016 16:52:46 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] f2fs: introduce __get_node_page to reuse common code
There are duplicated code in between get_node_page and get_node_page_ra,
introduce __get_node_page to includes common parts of these two, and
export get_node_page and get_node_page_ra by reusing __get_node_page.
Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
fs/f2fs/node.c | 88 +++++++++++++++++++++++-----------------------------------
1 file changed, 35 insertions(+), 53 deletions(-)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index c1ddf3d..5a2d800 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1060,56 +1060,35 @@ void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
f2fs_put_page(apage, err ? 1 : 0);
}
-struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
+/*
+ * readahead MAX_RA_NODE number of node pages.
+ */
+void ra_node_pages(struct page *parent, int start)
{
- struct page *page;
- int err;
+ struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
+ struct blk_plug plug;
+ int i, end;
+ nid_t nid;
- if (!nid)
- return ERR_PTR(-ENOENT);
- f2fs_bug_on(sbi, check_nid_range(sbi, nid));
-repeat:
- page = grab_cache_page(NODE_MAPPING(sbi), nid);
- if (!page)
- return ERR_PTR(-ENOMEM);
+ blk_start_plug(&plug);
- err = read_node_page(page, READ_SYNC);
- if (err < 0) {
- f2fs_put_page(page, 1);
- return ERR_PTR(err);
- } else if (err == LOCKED_PAGE) {
- goto page_hit;
+ /* Then, try readahead for siblings of the desired node */
+ end = start + MAX_RA_NODE;
+ end = min(end, NIDS_PER_BLOCK);
+ for (i = start; i < end; i++) {
+ nid = get_nid(parent, i, false);
+ ra_node_page(sbi, nid);
}
- lock_page(page);
-
- if (unlikely(!PageUptodate(page))) {
- f2fs_put_page(page, 1);
- return ERR_PTR(-EIO);
- }
- if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
- f2fs_put_page(page, 1);
- goto repeat;
- }
-page_hit:
- f2fs_bug_on(sbi, nid != nid_of_node(page));
- return page;
+ blk_finish_plug(&plug);
}
-/*
- * Return a locked page for the desired node page.
- * And, readahead MAX_RA_NODE number of node pages.
- */
-struct page *get_node_page_ra(struct page *parent, int start)
+struct page *__get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid,
+ struct page *parent, int start)
{
- struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
- struct blk_plug plug;
struct page *page;
- int err, i, end;
- nid_t nid;
+ int err;
- /* First, try getting the desired direct node. */
- nid = get_nid(parent, start, false);
if (!nid)
return ERR_PTR(-ENOENT);
f2fs_bug_on(sbi, check_nid_range(sbi, nid));
@@ -1126,21 +1105,11 @@ repeat:
goto page_hit;
}
- blk_start_plug(&plug);
-
- /* Then, try readahead for siblings of the desired node */
- end = start + MAX_RA_NODE;
- end = min(end, NIDS_PER_BLOCK);
- for (i = start + 1; i < end; i++) {
- nid_t tnid;
-
- tnid = get_nid(parent, i, false);
- ra_node_page(sbi, tnid);
- }
-
- blk_finish_plug(&plug);
+ if (parent)
+ ra_node_pages(parent, start + 1);
lock_page(page);
+
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
@@ -1154,6 +1123,19 @@ page_hit:
return page;
}
+struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
+{
+ return __get_node_page(sbi, nid, NULL, 0);
+}
+
+struct page *get_node_page_ra(struct page *parent, int start)
+{
+ struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
+ nid_t nid = get_nid(parent, start, false);
+
+ return __get_node_page(sbi, nid, parent, start);
+}
+
void sync_inode_page(struct dnode_of_data *dn)
{
if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
--
2.6.3
--
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