[PATCH 2/2] f2fs-tools: create sparse file first before stat

[Jaegeuk Kim <jaegeuk@kernel.org>]

We must create a sparse file first before calling stat().

Fixes: eb9d8037ed3b ("f2fs-tools: avoid mounting f2fs if tools already open the device")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 lib/libf2fs.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index bf2830d..a1a5c02 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -793,17 +793,24 @@ int get_device_info(int i)
 #endif
 	struct device_info *dev = c.devices + i;
 
+	if (c.sparse_mode) {
+		fd = open(dev->path, O_RDWR | O_CREAT | O_BINARY, 0644);
+		if (fd < 0) {
+			MSG(0, "\tError: Failed to open a sparse file!\n");
+			return -1;
+		}
+	}
+
 	stat_buf = malloc(sizeof(struct stat));
 	ASSERT(stat_buf);
-	if (stat(dev->path, stat_buf) < 0 ) {
-		MSG(0, "\tError: Failed to get the device stat!\n");
-		free(stat_buf);
-		return -1;
-	}
 
-	if (c.sparse_mode) {
-		fd = open(dev->path, O_RDWR | O_CREAT | O_BINARY, 0644);
-	} else {
+	if (!c.sparse_mode) {
+		if (stat(dev->path, stat_buf) < 0 ) {
+			MSG(0, "\tError: Failed to get the device stat!\n");
+			free(stat_buf);
+			return -1;
+		}
+
 		if (S_ISBLK(stat_buf->st_mode))
 			fd = open(dev->path, O_RDWR | O_EXCL);
 		else
-- 
2.19.0.605.g01d371f741-goog