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f2fs: clean up node page updating flow 

If read_node_page return LOCKED_PAGE, in its caller it's better a) skip
unneeded 'Update' flag and mapping info verfication; b) check nid value
stored in footer structure of node page.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-12-11 16:08:22 +08:00 committed by Jaegeuk Kim
parent ea212a4a7a
commit e1c51b9f1d
1 changed files with 15 additions and 11 deletions
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26
fs/f2fs/node.c
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@ -1063,12 +1063,13 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
if (err < 0) {
f2fs_put_page(page, 1);
return ERR_PTR(err);
} else if (err != LOCKED_PAGE) {
lock_page(page);
} else if (err == LOCKED_PAGE) {
goto page_hit;
}
if (unlikely(!PageUptodate(page) || nid != nid_of_node(page))) {
ClearPageUptodate(page);
lock_page(page);
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
@ -1076,6 +1077,8 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
f2fs_put_page(page, 1);
goto repeat;
}
page_hit:
f2fs_bug_on(sbi, nid != nid_of_node(page));
return page;
}
@ -1114,24 +1117,25 @@ struct page *get_node_page_ra(struct page *parent, int start)
end = start + MAX_RA_NODE;
end = min(end, NIDS_PER_BLOCK);
for (i = start + 1; i < end; i++) {
nid = get_nid(parent, i, false);
if (!nid)
nid_t tnid = get_nid(parent, i, false);
if (!tnid)
continue;
ra_node_page(sbi, nid);
ra_node_page(sbi, tnid);
}
blk_finish_plug(&plug);
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:
if (unlikely(!PageUptodate(page))) {
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
f2fs_bug_on(sbi, nid != nid_of_node(page));
return page;
}