The manual page of btrfsck clearly states 'btrfs check --repair' is a
dangerous operation.
Although this warning is in place users do not read the manual page and/or
are used to the behaviour of fsck utilities which repair the filesystem,
and thus potentially cause harm.
Similar to 'btrfs balance' without any filters, add a warning and a
countdown, so users can bail out before eventual corrupting the filesystem
more than it already is.
Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
---
check/main.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/check/main.c b/check/main.c
index fd05430c1f51..acded927281a 100644
--- a/check/main.c
+++ b/check/main.c
@@ -9970,6 +9970,23 @@ static int cmd_check(const struct cmd_struct *cmd, int argc, char **argv)
exit(1);
}
+ if (repair) {
+ int delay = 10;
+ printf("WARNING:\n\n");
+ printf("\tDo not use --repair unless you are advised to do so by a developer\n");
+ printf("\tor an experienced user, and then only after having accepted that no\n");
+ printf("\tfsck successfully repair all types of filesystem corruption. Eg.\n");
+ printf("\tsome other software or hardware bugs can fatally damage a volume.\n");
+ printf("\tThe operation will start in %d seconds.\n", delay);
+ printf("\tUse Ctrl-C to stop it.\n");
+ while (delay) {
+ printf("%2d", delay--);
+ fflush(stdout);
+ sleep(1);
+ }
+ printf("\nStarting repair.\n");
+ }
+
/*
* experimental and dangerous
*/
--
2.16.4
