[PATCH 4.9 075/151] hfsplus: fix return value of hfsplus_get_block()

[Greg Kroah-Hartman]

From: Ernesto A. FernÃndez <ernesto.mnd.fernandez@xxxxxxxxx>

[ Upstream commit 839c3a6a5e1fbc8542d581911b35b2cb5cd29304 ]

Direct writes to empty inodes fail with EIO.  The generic direct-io code
is in part to blame (a patch has been submitted as "direct-io: allow
direct writes to empty inodes"), but hfsplus is worse affected than the
other filesystems because the fallback to buffered I/O doesn't happen.

The problem is the return value of hfsplus_get_block() when called with
!create.  Change it to be more consistent with the other modules.

Link: http://lkml.kernel.org/r/2cd1301404ec7cf1e39c8f11a01a4302f1460ad6.1539195310.git.ernesto.mnd.fernandez@xxxxxxxxx
Signed-off-by: Ernesto A. FernÃndez <ernesto.mnd.fernandez@xxxxxxxxx>
Reviewed-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/hfsplus/extents.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/hfsplus/extents.c b/fs/hfsplus/extents.c
index ce0b8f8374081..d93c051559cb8 100644
--- a/fs/hfsplus/extents.c
+++ b/fs/hfsplus/extents.c
@@ -236,7 +236,9 @@ int hfsplus_get_block(struct inode *inode, sector_t iblock,
 	ablock = iblock >> sbi->fs_shift;
 
 	if (iblock >= hip->fs_blocks) {
-		if (iblock > hip->fs_blocks || !create)
+		if (!create)
+			return 0;
+		if (iblock > hip->fs_blocks)
 			return -EIO;
 		if (ablock >= hip->alloc_blocks) {
 			res = hfsplus_file_extend(inode, false);
-- 
2.20.1