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tools/fw_env: use fsync to ensure that data is physically stored

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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>
This commit is contained in:
Michael Heimpold 2013-05-20 21:34:42 +02:00 • committed by Tom Rini
parent aae6f016a7
commit 7e99e14d4b
1 changed files with 12 additions and 0 deletions
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12
tools/env/fw_env.c vendored
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@ -1088,7 +1088,19 @@ 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",