[PATCH 3/7] libxfs: return flush failures

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Modify platform_flush_device so that we can return error status when
device flushes fail.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 libfrog/linux.c    |   25 +++++++++++++++++--------
 libfrog/platform.h |    2 +-
 2 files changed, 18 insertions(+), 9 deletions(-)


diff --git a/libfrog/linux.c b/libfrog/linux.c
index 41a168b4..60bc1dc4 100644
--- a/libfrog/linux.c
+++ b/libfrog/linux.c
@@ -140,20 +140,29 @@ platform_set_blocksize(int fd, char *path, dev_t device, int blocksize, int fata
 	return error;
 }
 
-void
-platform_flush_device(int fd, dev_t device)
+/*
+ * Flush dirty pagecache and disk write cache to stable media.  Returns 0 for
+ * success or -1 (with errno set) for failure.
+ */
+int
+platform_flush_device(
+	int		fd,
+	dev_t		device)
 {
 	struct stat	st;
+	int		ret;
+
 	if (major(device) == RAMDISK_MAJOR)
-		return;
+		return 0;
 
-	if (fstat(fd, &st) < 0)
-		return;
+	ret = fstat(fd, &st);
+	if (ret)
+		return ret;
 
 	if (S_ISREG(st.st_mode))
-		fsync(fd);
-	else
-		ioctl(fd, BLKFLSBUF, 0);
+		return fsync(fd);
+
+	return ioctl(fd, BLKFLSBUF, 0);
 }
 
 void
diff --git a/libfrog/platform.h b/libfrog/platform.h
index 76887e5e..0aef318a 100644
--- a/libfrog/platform.h
+++ b/libfrog/platform.h
@@ -12,7 +12,7 @@ int platform_check_ismounted(char *path, char *block, struct stat *sptr,
 int platform_check_iswritable(char *path, char *block, struct stat *sptr);
 int platform_set_blocksize(int fd, char *path, dev_t device, int bsz,
 		int fatal);
-void platform_flush_device(int fd, dev_t device);
+int platform_flush_device(int fd, dev_t device);
 char *platform_findrawpath(char *path);
 char *platform_findblockpath(char *path);
 int platform_direct_blockdev(void);