xps: Transmit Packet Steering

[net-next-2.6.git] / fs / ioctl.c

diff --git a/fs/ioctl.c b/fs/ioctl.c
index f855ea4fc88895a13b53b075b9a3fb0dbcb53d8b..e92fdbb3bc3aebd5b52221d2b0e5ec4094a37fe9 100644 (file)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -530,6 +530,41 @@ static int ioctl_fsthaw(struct file *filp)
        return thaw_super(sb);
 }
 
+static int ioctl_fstrim(struct file *filp, void __user *argp)
+{
+       struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
+       struct fstrim_range range;
+       int ret = 0;
+
+       if (!capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
+       /* If filesystem doesn't support trim feature, return. */
+       if (sb->s_op->trim_fs == NULL)
+               return -EOPNOTSUPP;
+
+       /* If a blockdevice-backed filesystem isn't specified, return EINVAL. */
+       if (sb->s_bdev == NULL)
+               return -EINVAL;
+
+       if (argp == NULL) {
+               range.start = 0;
+               range.len = ULLONG_MAX;
+               range.minlen = 0;
+       } else if (copy_from_user(&range, argp, sizeof(range)))
+               return -EFAULT;
+
+       ret = sb->s_op->trim_fs(sb, &range);
+       if (ret < 0)
+               return ret;
+
+       if ((argp != NULL) &&
+           (copy_to_user(argp, &range, sizeof(range))))
+               return -EFAULT;
+
+       return 0;
+}
+
 /*
  * When you add any new common ioctls to the switches above and below
  * please update compat_sys_ioctl() too.
@@ -580,6 +615,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                error = ioctl_fsthaw(filp);
                break;
 
+       case FITRIM:
+               error = ioctl_fstrim(filp, argp);
+               break;
+
        case FS_IOC_FIEMAP:
                return ioctl_fiemap(filp, arg);