btrfs-progs: fix name lengths in cmd_subvol_create

cmd_subvol_create() calls either BTRFS_IOC_SUBVOL_CREATE
or BTRFS_IOC_SUBVOL_CREATE_V2 depending on whether or
not inherit is set.  However, these 2 ioctls have different
args structures with different length name[] members.

In the BTRFS_IOC_SUBVOL_CREATE case, the arg is
btrfs_ioctl_vol_args, with a BTRFS_PATH_NAME_MAX length
name, not a BTRFS_SUBVOL_NAME_MAX length name.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>

diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index af04a6b..1432b99 100644 (file)
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -149,8 +149,8 @@ static int cmd_subvol_create(int argc, char **argv)
                struct btrfs_ioctl_vol_args     args;
 
                memset(&args, 0, sizeof(args));
-               strncpy(args.name, newname, BTRFS_SUBVOL_NAME_MAX);
-               args.name[BTRFS_SUBVOL_NAME_MAX-1] = 0;
+               strncpy(args.name, newname, BTRFS_PATH_NAME_MAX);
+               args.name[BTRFS_PATH_NAME_MAX-1] = 0;
 
                res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
        }