[Devel] [PATCH] fs/fuse kio: deny unavailable ioctl's in kio

[Pavel Butsykin]

There are some ioctl's that were made to service the kio module, and they
should not be available to user app.

Also there are two ioctls PCS_IOC_NOCSUMONREAD and PCS_IOC_NOWRITEDELAY that
must be handled in kio, otherwise they are meaningless. So let's return
-EOPNOTSUPP unless we implement them in kio.

#VSTOR-19332

Signed-off-by: Pavel Butsykin <pbutsykin at virtuozzo.com>
---
 fs/fuse/kio/pcs/pcs_fuse_kdirect.c | 19 ++++++++++++++++---
 fs/fuse/kio/pcs/pcs_ioctl.h        |  5 +++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
index 89866370a341..13acd2e172f3 100644
--- a/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
+++ b/fs/fuse/kio/pcs/pcs_fuse_kdirect.c
@@ -1110,9 +1110,22 @@ static int pcs_kio_classify_req(struct fuse_conn *fc, struct fuse_req *req, bool
 	case FUSE_IOCTL: {
 		struct fuse_ioctl_in const *inarg = req->in.args[0].value;
 
-		if (inarg->cmd != FS_IOC_FIEMAP)
-			return 1;
-
+		switch (inarg->cmd) {
+			case FS_IOC_FIEMAP:
+				break;
+			case PCS_IOC_NOCSUMONREAD:
+			case PCS_IOC_NOWRITEDELAY:
+				return -EOPNOTSUPP;
+			case PCS_IOC_INIT_KDIRECT:
+			case PCS_IOC_CSCONN:
+			case PCS_IOC_GETFILEINFO:
+			case PCS_IOC_KDIRECT_CLAIM:
+			case PCS_IOC_KDIRECT_RELEASE:
+			case PCS_IOC_GETMAP:
+				return -EPERM;
+			default:
+				return 1;
+		}
 		break;
 	}
 	default:
diff --git a/fs/fuse/kio/pcs/pcs_ioctl.h b/fs/fuse/kio/pcs/pcs_ioctl.h
index 5cf40e35f881..d6c02ae66977 100644
--- a/fs/fuse/kio/pcs/pcs_ioctl.h
+++ b/fs/fuse/kio/pcs/pcs_ioctl.h
@@ -78,6 +78,11 @@ struct pcs_ioc_csconn
 #define PCS_IOC_CS_REOPEN	(PCS_IOC_CS_OPEN|PCS_IOC_CS_CLOSE)
 };
 
+#define PCS_IOC_NOCSUMONREAD	_IOW('V',3,u32)
+# define PCS_IOC_NOCSUMONREAD_DATA	1
+# define PCS_IOC_NOCSUMONREAD_METADATA	2
+#define PCS_IOC_NOWRITEDELAY	_IOW('V',4,u32)
+
 #define PCS_IOC_INIT_KDIRECT	_IOR('V',32, struct pcs_ioc_init_kdirect)
 #define PCS_IOC_CSCONN		_IOR('V',33, struct pcs_ioc_csconn)
 #define PCS_IOC_GETFILEINFO	_IOR('V',34, struct pcs_ioc_fileinfo)
-- 
2.15.1