mount_root: permit to pass mount options for rootfs mount

Introduce an additional arg on calling mount_root start to pass
additional mount options on filesystem mount.

On example is F2FS filesystem mounted with compress_algorithm option
enabled to compress files as they are written to reduce flash wear.

Example usage: (assuming a F2FS filesystem)

mount_root start "compress_algorithm=zstd"

This is currently limited to rootfs mount and is not currently supported
to pass option to rootfs_data mount. (overlay scenario)

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/mount_root.c b/mount_root.c
index 3bd4a24988a4196205c0790c30692d53c90697b2..e7c398f3d27961c423b91deed4f0b4f2f3278799 100644 (file)
--- a/mount_root.c
+++ b/mount_root.c
@@ -28,7 +28,7 @@
  * filesystem.
  */
 static int
-start(int argc, char *argv[1])
+start(int argc, char *argv[3])
 {
        struct volume *root;
        struct volume *data = volume_find("rootfs_data");
@@ -40,8 +40,17 @@ start(int argc, char *argv[1])
        if (!data) {
                root = volume_find("rootfs");
                volume_init(root);
-               ULOG_NOTE("mounting /dev/root\n");
-               mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
+               if (argc < 3)
+                       ULOG_NOTE("mounting /dev/root\n");
+               else
+                       ULOG_NOTE("mounting /dev/root with options %s\n", argv[2]);
+
+               /*
+                * If present, mount rootfs with passed options.
+                * Example F2FS filesystem with compress_algorithm option.
+                */
+               mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT,
+                     argc < 3 ? 0 : argv[2]);
        }
 
        /* Check for extroot config in rootfs before even trying rootfs_data */