Closing a file descriptor does not guarantee that the data has been successfully saved to disk, as the kernel might defer the write.
Signed-off-by: Michael Heimpold mhei@heimpold.de --- tools/env/fw_env.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c index 428e374..0420495 100644 --- a/tools/env/fw_env.c +++ b/tools/env/fw_env.c @@ -1033,7 +1033,19 @@ static int flash_io (int mode)
rc = flash_write (fd_current, fd_target, dev_target);
+ if (fsync (fd_current)) { + fprintf (stderr, + "fsync failed on %s: %s\n", + DEVNAME (dev_current), strerror (errno)); + } + if (HaveRedundEnv) { + if (fsync (fd_target)) { + fprintf (stderr, + "fsync failed on %s: %s\n", + DEVNAME (dev_current), strerror (errno)); + } + if (close (fd_target)) { fprintf (stderr, "I/O error on %s: %s\n",