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>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f6c4bdaaae86..7d8b96275092 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)