From d18edda2b90b533163a5eb848329414a1d8ac0bc Mon Sep 17 00:00:00 2001
From: Matthew Monaco <matthew.monaco@0x01b.net>
Date: Sat, 19 May 2012 09:05:50 -0600
Subject: [PATCH] cryptsetup: support discards (TRIM) (cherry picked from
 commit 2a2aab602e1d8b6bf0b440730e379f9dd6586b80)

---
 src/cryptsetup/cryptsetup.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index f3116b7..c6ac7d2 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -41,6 +41,7 @@ static char *opt_hash = NULL;
 static unsigned opt_tries = 0;
 static bool opt_readonly = false;
 static bool opt_verify = false;
+static bool opt_discards = false;
 static usec_t opt_timeout = DEFAULT_TIMEOUT_USEC;
 
 /* Options Debian's crypttab knows we don't:
@@ -98,6 +99,8 @@ static int parse_one_option(const char *option) {
                 opt_readonly = true;
         else if (streq(option, "verify"))
                 opt_verify = true;
+        else if (streq(option, "allow-discards"))
+                opt_discards = true;
         else if (streq(option, "luks"))
                 opt_type = CRYPT_LUKS1;
         else if (streq(option, "plain") ||
@@ -314,6 +317,9 @@ int main(int argc, char *argv[]) {
                 if (opt_readonly)
                         flags |= CRYPT_ACTIVATE_READONLY;
 
+                if (opt_discards)
+                        flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
+
                 if (opt_timeout > 0)
                         until = now(CLOCK_MONOTONIC) + opt_timeout;
                 else