From 746e2403927efbd7c7f2e796314e3cfb3cfabaa4 Mon Sep 17 00:00:00 2001 From: Yunlei He Date: Tue, 20 Dec 2016 11:11:35 +0800 Subject: [PATCH] f2fs: add a case of no need to read a page in write begin If the range we write cover the whole valid data in the last page, we do not need to read it. Signed-off-by: Yunlei He [Jaegeuk Kim: nullify the remaining area (fix: xfstests/f2fs/001)] Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 9ac262564fa6..2c5df1dc1479 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1715,6 +1715,11 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping, if (len == PAGE_SIZE || PageUptodate(page)) return 0; + if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) { + zero_user_segment(page, len, PAGE_SIZE); + return 0; + } + if (blkaddr == NEW_ADDR) { zero_user_segment(page, 0, PAGE_SIZE); SetPageUptodate(page); @@ -1768,7 +1773,7 @@ static int f2fs_write_end(struct file *file, * let generic_perform_write() try to copy data again through copied=0. */ if (!PageUptodate(page)) { - if (unlikely(copied != PAGE_SIZE)) + if (unlikely(copied != len)) copied = 0; else SetPageUptodate(page);