autofs: add autofs_dev_ioctl_version() for AUTOFS_DEV_IOCTL_VERSION_CMD

No functional changes, based on the following justification.

1. Make the code more consistent using the ioctl vector _ioctls[],
   rather than assigning NULL only for this ioctl command.
2. Remove goto done; for better maintainability in the long run.
3. The existing code is based on the fact that validate_dev_ioctl()
   sets ioctl version for any command, but AUTOFS_DEV_IOCTL_VERSION_CMD
   should explicitly set it regardless of the default behavior.

Link: http://lkml.kernel.org/r/20160812024846.12352.9885.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Ian Kent <ikent@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 13e7517..7289216 100644 (file)
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -172,6 +172,17 @@ static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
        return sbi;
 }
 
+/* Return autofs dev ioctl version */
+static int autofs_dev_ioctl_version(struct file *fp,
+                                   struct autofs_sb_info *sbi,
+                                   struct autofs_dev_ioctl *param)
+{
+       /* This should have already been set. */
+       param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
+       param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
+       return 0;
+}
+
 /* Return autofs module protocol version */
 static int autofs_dev_ioctl_protover(struct file *fp,
                                     struct autofs_sb_info *sbi,
@@ -590,7 +601,8 @@ static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
                int cmd;
                ioctl_fn fn;
        } _ioctls[] = {
-               {cmd_idx(AUTOFS_DEV_IOCTL_VERSION_CMD), NULL},
+               {cmd_idx(AUTOFS_DEV_IOCTL_VERSION_CMD),
+                        autofs_dev_ioctl_version},
                {cmd_idx(AUTOFS_DEV_IOCTL_PROTOVER_CMD),
                         autofs_dev_ioctl_protover},
                {cmd_idx(AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD),
@@ -655,10 +667,6 @@ static int _autofs_dev_ioctl(unsigned int command,
        if (err)
                goto out;
 
-       /* The validate routine above always sets the version */
-       if (cmd == AUTOFS_DEV_IOCTL_VERSION_CMD)
-               goto done;
-
        fn = lookup_dev_ioctl(cmd);
        if (!fn) {
                pr_warn("unknown command 0x%08x\n", command);
@@ -672,9 +680,11 @@ static int _autofs_dev_ioctl(unsigned int command,
        /*
         * For obvious reasons the openmount can't have a file
         * descriptor yet. We don't take a reference to the
-        * file during close to allow for immediate release.
+        * file during close to allow for immediate release,
+        * and the same for retrieving ioctl version.
         */
-       if (cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
+       if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
+           cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
            cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
                fp = fget(param->ioctlfd);
                if (!fp) {
@@ -707,7 +717,6 @@ cont:
 
        if (fp)
                fput(fp);
-done:
        if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE))
                err = -EFAULT;
 out: