From d653788a43475eb3cdfcfaa60fb53451878944cf Mon Sep 17 00:00:00 2001 From: Gu Zheng Date: Fri, 7 Mar 2014 18:43:36 +0800 Subject: [PATCH] f2fs: optimize restore_node_summary slightly Previously, we ra_sum_pages to pre-read contiguous pages as more as possible, and if we fail to alloc more pages, an ENOMEM error will be reported upstream, even though we have alloced some pages yet. In fact, we can use the available pages to do the job partly, and continue the rest in the following circle. Only reporting ENOMEM upstream if we really can not alloc any available page. And another fix is ignoring dealing with the following pages if an EIO occurs when reading page from page_list. Signed-off-by: Gu Zheng Reviewed-by: Chao Yu [Jaegeuk Kim: modify the flow for better neat code] Signed-off-by: Jaegeuk Kim --- fs/f2fs/node.c | 28 ++++++++++++---------------- fs/f2fs/segment.c | 7 +++++-- 2 files changed, 17 insertions(+), 18 deletions(-) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 12c9ded767d9..c415cec041b7 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1588,15 +1588,8 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages, for (; page_idx < start + nrpages; page_idx++) { /* alloc temporal page for read node summary info*/ page = alloc_page(GFP_F2FS_ZERO); - if (!page) { - struct page *tmp; - list_for_each_entry_safe(page, tmp, pages, lru) { - list_del(&page->lru); - unlock_page(page); - __free_pages(page, 0); - } - return -ENOMEM; - } + if (!page) + break; lock_page(page); page->index = page_idx; @@ -1607,7 +1600,8 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages, f2fs_submit_page_mbio(sbi, page, page->index, &fio); f2fs_submit_merged_bio(sbi, META, READ); - return 0; + + return page_idx - start; } int restore_node_summary(struct f2fs_sb_info *sbi, @@ -1626,15 +1620,17 @@ int restore_node_summary(struct f2fs_sb_info *sbi, addr = START_BLOCK(sbi, segno); sum_entry = &sum->entries[0]; - for (i = 0; i < last_offset; i += nrpages, addr += nrpages) { + for (i = 0; !err && i < last_offset; i += nrpages, addr += nrpages) { nrpages = min(last_offset - i, bio_blocks); /* read ahead node pages */ - err = ra_sum_pages(sbi, &page_list, addr, nrpages); - if (err) - return err; + nrpages = ra_sum_pages(sbi, &page_list, addr, nrpages); + if (!nrpages) + return -ENOMEM; list_for_each_entry_safe(page, tmp, &page_list, lru) { + if (err) + goto skip; lock_page(page); if (unlikely(!PageUptodate(page))) { @@ -1646,9 +1642,9 @@ int restore_node_summary(struct f2fs_sb_info *sbi, sum_entry->ofs_in_node = 0; sum_entry++; } - - list_del(&page->lru); unlock_page(page); +skip: + list_del(&page->lru); __free_pages(page, 0); } } diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 199c964680c5..b3f84318b7ed 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1160,9 +1160,12 @@ static int read_normal_summaries(struct f2fs_sb_info *sbi, int type) ns->ofs_in_node = 0; } } else { - if (restore_node_summary(sbi, segno, sum)) { + int err; + + err = restore_node_summary(sbi, segno, sum); + if (err) { f2fs_put_page(new, 1); - return -EINVAL; + return err; } } } -- 2.20.1