From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 13 Jun 2014 04:07:31 +0000 (+0900)
Subject: f2fs: fix not to allocate unnecessary blocks during fallocate
X-Git-Tag: v4.9.8~6135^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=98397ff3cddcfdedd2ba1701bd30a73c1d733769;p=platform%2Fkernel%2Flinux-rpi3.git

f2fs: fix not to allocate unnecessary blocks during fallocate

This patch fixes the fallocate bug like below. (See xfstests/255)

In fallocate(fd, 0, 20480),
expand_inode_data processes
	for (index = pg_start; index <= pg_end; index++) {
		f2fs_reserve_block();
		...
	}

So, even though fallocate requests 20480, 5 blocks, f2fs allocates 6 blocks
including pg_end.
So, this patch adds one condition to avoid block allocation.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f6c4bda..7d8b962 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -664,11 +664,14 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
 	for (index = pg_start; index <= pg_end; index++) {
 		struct dnode_of_data dn;
 
+		if (index == pg_end && !off_end)
+			goto noalloc;
+
 		set_new_dnode(&dn, inode, NULL, NULL, 0);
 		ret = f2fs_reserve_block(&dn, index);
 		if (ret)
 			break;
-
+noalloc:
 		if (pg_start == pg_end)
 			new_size = offset + len;
 		else if (index == pg_start && off_start)