fuse: support ioctl on directories

Multiplexing filesystems may want to support ioctls on the underlying
files and directores (e.g. FS_IOC_{GET,SET}FLAGS).

Ioctl support on directories was missing so add it now.

Reported-by: Antonio SJ Musumeci <bile@landofbile.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

3 files changed, 32 insertions, 4 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 9f63e493a9b6..344577933f62 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1182,6 +1182,30 @@ static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
         return fuse_fsync_common(file, start, end, datasync, 1);
 }
 
+static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
+                            unsigned long arg)
+{
+        struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
+
+        /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
+        if (fc->minor < 18)
+                return -ENOTTY;
+
+        return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
+}
+
+static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
+                                   unsigned long arg)
+{
+        struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
+
+        if (fc->minor < 18)
+                return -ENOTTY;
+
+        return fuse_ioctl_common(file, cmd, arg,
+                                 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
+}
+
 static bool update_mtime(unsigned ivalid)
 {
         /* Always update if mtime is explicitly set  */
@@ -1596,6 +1620,8 @@ static const struct file_operations fuse_dir_operations = {
         .open           = fuse_dir_open,
         .release        = fuse_dir_release,
         .fsync          = fuse_dir_fsync,
+        .unlocked_ioctl = fuse_dir_ioctl,
+        .compat_ioctl   = fuse_dir_compat_ioctl,
 };
 
 static const struct inode_operations fuse_common_inode_operations = {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c297425cba71..4a199fd93fbd 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1926,8 +1926,8 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 }
 EXPORT_SYMBOL_GPL(fuse_do_ioctl);
 
-static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
-                                   unsigned long arg, unsigned int flags)
+long fuse_ioctl_common(struct file *file, unsigned int cmd,
+                       unsigned long arg, unsigned int flags)
 {
         struct inode *inode = file->f_dentry->d_inode;
         struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1944,13 +1944,13 @@ static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
 static long fuse_file_ioctl(struct file *file, unsigned int cmd,
                             unsigned long arg)
 {
-        return fuse_file_ioctl_common(file, cmd, arg, 0);
+        return fuse_ioctl_common(file, cmd, arg, 0);
 }
 
 static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
                                    unsigned long arg)
 {
-        return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
+        return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
 }
 
 /*
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index cf6db0a93219..09337bcc2554 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -765,6 +765,8 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
                        size_t count, loff_t *ppos, int write);
 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
                    unsigned int flags);
+long fuse_ioctl_common(struct file *file, unsigned int cmd,
+                       unsigned long arg, unsigned int flags);
 unsigned fuse_file_poll(struct file *file, poll_table *wait);
 int fuse_dev_release(struct inode *inode, struct file *file);