[PATCH 45/52] virtio: Free fuse devices on umount

[Vivek Goyal]

From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>

When unmounting the fs close all the fuse devices.
This includes making sure the daemon gets a FUSE_DESTROY to
tell it.

Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
 fs/fuse/fuse_i.h    |  1 +
 fs/fuse/inode.c     |  3 ++-
 fs/fuse/virtio_fs.c | 13 ++++++++++++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 7b2db87c6ead..30c7b4b56200 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -85,6 +85,7 @@ struct fuse_mount_data {
        unsigned default_permissions:1;
        unsigned allow_other:1;
        unsigned dax:1;
+       unsigned destroy:1;
        unsigned max_read;
        unsigned blksize;
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 178ac3171564..4d2d623e607f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1263,7 +1263,7 @@ int fuse_fill_super_common(struct super_block *sb,
                goto err_put_root;
        __set_bit(FR_BACKGROUND, &init_req->flags);
 
-       if (is_bdev) {
+       if (mount_data->destroy) {
                fc->destroy_req = fuse_request_alloc(0);
                if (!fc->destroy_req)
                        goto err_free_init_req;
@@ -1339,6 +1339,7 @@ static int fuse_fill_super(struct super_block *sb, void 
*data, int silent)
        d.fiq_ops = &fuse_dev_fiq_ops;
        d.fiq_priv = NULL;
        d.fudptr = &file->private_data;
+       d.destroy = is_bdev;
        err = fuse_fill_super_common(sb, &d);
 
 err_fput:
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index f436f5b3f85c..c71bc47395b4 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -1128,6 +1128,7 @@ static int virtio_fs_fill_super(struct super_block *sb, 
void *data,
        d.fiq_ops = &virtio_fs_fiq_ops;
        d.fiq_priv = fs;
        d.fudptr = (void **)&fs->vqs[2].fud;
+       d.destroy = true; /* Send destroy request on unmount */
        err = fuse_fill_super_common(sb, &d);
 
        if (err < 0)
@@ -1160,6 +1161,16 @@ static int virtio_fs_fill_super(struct super_block *sb, 
void *data,
        return err;
 }
 
+static void virtio_kill_sb(struct super_block *sb)
+{
+       struct fuse_conn *fc = get_fuse_conn_super(sb);
+       fuse_kill_sb_anon(sb);
+       if (fc) {
+               struct virtio_fs *vfs = fc->iq.priv;
+               virtio_fs_free_devs(vfs);
+       }
+}
+
 static struct dentry *virtio_fs_mount(struct file_system_type *fs_type,
                                      int flags, const char *dev_name,
                                      void *raw_data)
@@ -1171,7 +1182,7 @@ static struct file_system_type virtio_fs_type = {
        .owner          = THIS_MODULE,
        .name           = KBUILD_MODNAME,
        .mount          = virtio_fs_mount,
-       .kill_sb        = fuse_kill_sb_anon,
+       .kill_sb        = virtio_kill_sb,
 };
 
 static int __init virtio_fs_init(void)
-- 
2.13.6