Discard should happen only when everything has been validated, just
before we start writing to the device. If it happens earlier, it is
possible that mkfs will abort, but managed to already wipe data. This
patch moves the discard to the latest possible moment.
Signed-off-by: Jan Tulak <jtulak@xxxxxxxxxx>
---
mkfs/xfs_mkfs.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 2e53c1e8..81d9859a 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -2389,8 +2389,7 @@ _("log stripe unit (%d bytes) is too large (maximum is 256KiB)\n"
static void
open_devices(
struct mkfs_params *cfg,
- struct libxfs_xinit *xi,
- bool discard)
+ struct libxfs_xinit *xi)
{
uint64_t sector_mask;
@@ -2419,8 +2418,16 @@ open_devices(
xi->dsize &= sector_mask;
xi->rtsize &= sector_mask;
xi->logBBsize &= (uint64_t)-1 << (max(cfg->lsectorlog, 10) - BBSHIFT);
+}
-
+static void
+discard_data(
+ struct libxfs_xinit *xi,
+ bool discard)
+{
+ /*
+ * This function has to be called after libxfs has been initialized.
+ */
if (!discard)
return;
@@ -3901,7 +3908,7 @@ main(
/*
* Open and validate the device configurations
*/
- open_devices(&cfg, &xi, (discard && !dry_run));
+ open_devices(&cfg, &xi);
validate_datadev(&cfg, &cli);
validate_logdev(&cfg, &cli, &logfile);
validate_rtdev(&cfg, &cli, &rtfile);
@@ -3952,6 +3959,11 @@ main(
exit(0);
}
+ /*
+ * All values have been validated, discard the old device layout.
+ */
+ discard_data(&xi, (discard && !dry_run));
+
/*
* we need the libxfs buffer cache from here on in.
*/
--
2.18.0
