[PATCH] fuse: allow skipping abort interface for virtiofs

[Xie Yongji <xieyongji@bytedance.com>]

The commit 15c8e72e88e0 ("fuse: allow skipping control
interface and forced unmount") tries to remove the control
interface for virtio-fs since it does not support aborting
requests which are being processed. But it doesn't work now.

This commit fixes the bug, but only remove the abort interface
instead since other interfaces should be useful.

Fixes: 15c8e72e88e0 ("fuse: allow skipping control interface and forced unmount")
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
 fs/fuse/control.c   | 4 ++--
 fs/fuse/fuse_i.h    | 6 +++---
 fs/fuse/inode.c     | 2 +-
 fs/fuse/virtio_fs.c | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 7cede9a3bc96..d93d8ea3a090 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -272,8 +272,8 @@ int fuse_ctl_add_conn(struct fuse_conn *fc)
 
 	if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1,
 				 NULL, &fuse_ctl_waiting_ops) ||
-	    !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1,
-				 NULL, &fuse_ctl_abort_ops) ||
+	    (!fc->no_abort_control && !fuse_ctl_add_dentry(parent, fc, "abort",
+			S_IFREG | 0200, 1, NULL, &fuse_ctl_abort_ops)) ||
 	    !fuse_ctl_add_dentry(parent, fc, "max_background", S_IFREG | 0600,
 				 1, NULL, &fuse_conn_max_background_ops) ||
 	    !fuse_ctl_add_dentry(parent, fc, "congestion_threshold",
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 488b460e046f..e29a4e2f2b35 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -507,7 +507,7 @@ struct fuse_fs_context {
 	bool default_permissions:1;
 	bool allow_other:1;
 	bool destroy:1;
-	bool no_control:1;
+	bool no_abort_control:1;
 	bool no_force_umount:1;
 	bool legacy_opts_show:1;
 	enum fuse_dax_mode dax_mode;
@@ -766,8 +766,8 @@ 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 create abort entry in fusectl fs */
+	unsigned int no_abort_control:1;
 
 	/** Do not allow MNT_FORCE umount */
 	unsigned int no_force_umount:1;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 8c0665c5dff8..02a16cd35f42 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1564,7 +1564,7 @@ int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
 	fc->legacy_opts_show = ctx->legacy_opts_show;
 	fc->max_read = max_t(unsigned int, 4096, ctx->max_read);
 	fc->destroy = ctx->destroy;
-	fc->no_control = ctx->no_control;
+	fc->no_abort_control = ctx->no_abort_control;
 	fc->no_force_umount = ctx->no_force_umount;
 
 	err = -ENOMEM;
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 8db53fa67359..af369bea6dbb 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -1287,7 +1287,7 @@ static inline void virtio_fs_ctx_set_defaults(struct fuse_fs_context *ctx)
 	ctx->max_read = UINT_MAX;
 	ctx->blksize = 512;
 	ctx->destroy = true;
-	ctx->no_control = true;
+	ctx->no_abort_control = true;
 	ctx->no_force_umount = true;
 }
 
-- 
2.20.1