From: Hugh Dickins <hughd@google.com>
Date: Sun, 4 Aug 2013 18:30:25 +0000 (-0700)
Subject: tmpfs: fix SEEK_DATA/SEEK_HOLE regression
X-Git-Tag: upstream/snapshot3+hdmi~4601
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=387aae6fdd737038e92d7bb40712bdf6dcb11945;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

tmpfs: fix SEEK_DATA/SEEK_HOLE regression

Commit 46a1c2c7ae53 ("vfs: export lseek_execute() to modules") broke the
tmpfs SEEK_DATA/SEEK_HOLE implementation, because vfs_setpos() converts
the carefully prepared -ENXIO to -EINVAL.  Other filesystems avoid it in
error cases: do the same in tmpfs.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Jie Liu <jeff.liu@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/shmem.c b/mm/shmem.c
index a87990c..8335dbd 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1798,7 +1798,8 @@ static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence)
 		}
 	}
 
-	offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE);
+	if (offset >= 0)
+		offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE);
 	mutex_unlock(&inode->i_mutex);
 	return offset;
 }