fuse: allow skipping control interface and forced unmount

virtio-fs does not support aborting requests which are being
processed. That is requests which have been sent to fuse daemon on host.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 48d214d..fc89cb4 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -468,6 +468,8 @@ struct fuse_fs_context {
        bool default_permissions:1;
        bool allow_other:1;
        bool destroy:1;
+       bool no_control:1;
+       bool no_force_umount:1;
        unsigned int max_read;
        unsigned int blksize;
        const char *subtype;
@@ -696,6 +698,12 @@ struct fuse_conn {
        /* Delete dentries that have gone stale */
        unsigned int delete_stale:1;
 
+       /** Do not create entry in fusectl fs */
+       unsigned int no_control:1;
+
+       /** Do not allow MNT_FORCE umount */
+       unsigned int no_force_umount:1;
+
        /** The number of requests waiting for completion */
        atomic_t num_waiting;
 

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index cd6ffb3..10d193b 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -364,7 +364,10 @@ void fuse_unlock_inode(struct inode *inode, bool locked)
 
 static void fuse_umount_begin(struct super_block *sb)
 {
-       fuse_abort_conn(get_fuse_conn_super(sb));
+       struct fuse_conn *fc = get_fuse_conn_super(sb);
+
+       if (!fc->no_force_umount)
+               fuse_abort_conn(fc);
 }
 
 static void fuse_send_destroy(struct fuse_conn *fc)
@@ -1171,6 +1174,8 @@ int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
        fc->group_id = ctx->group_id;
        fc->max_read = max_t(unsigned, 4096, ctx->max_read);
        fc->destroy = ctx->destroy;
+       fc->no_control = ctx->no_control;
+       fc->no_force_umount = ctx->no_force_umount;
 
        err = -ENOMEM;
        root = fuse_get_root_inode(sb, ctx->rootmode);