cifs: add passthrough for smb2 setinfo

Add support to send smb2 set-info commands from userspace.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Paulo Alcantara <palcantara@suse.de>

diff --git a/fs/cifs/cifs_ioctl.h b/fs/cifs/cifs_ioctl.h
index 086ddc5..6c3bd07 100644 (file)
--- a/fs/cifs/cifs_ioctl.h
+++ b/fs/cifs/cifs_ioctl.h
@@ -46,6 +46,7 @@ struct smb_snapshot_array {
 /* query_info flags */
 #define PASSTHRU_QUERY_INFO    0x00000000
 #define PASSTHRU_FSCTL         0x00000001
+#define PASSTHRU_SET_INFO      0x00000002
 struct smb_query_info {
        __u32   info_type;
        __u32   file_info_class;

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 64a5864..461a68f 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1369,7 +1369,10 @@ smb2_ioctl_query_info(const unsigned int xid,
        struct cifs_fid fid;
        struct kvec qi_iov[1];
        struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
+       struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
        struct kvec close_iov[1];
+       unsigned int size[2];
+       void *data[2];
 
        memset(rqst, 0, sizeof(rqst));
        resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
@@ -1404,7 +1407,6 @@ smb2_ioctl_query_info(const unsigned int xid,
 
        memset(&oparms, 0, sizeof(oparms));
        oparms.tcon = tcon;
-       oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
        oparms.disposition = FILE_OPEN;
        if (is_dir)
                oparms.create_options = CREATE_NOT_FILE;
@@ -1413,9 +1415,6 @@ smb2_ioctl_query_info(const unsigned int xid,
        oparms.fid = &fid;
        oparms.reconnect = false;
 
-       /*
-        * FSCTL codes encode the special access they need in the fsctl code.
-        */
        if (qi.flags & PASSTHRU_FSCTL) {
                switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
                case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
@@ -1431,6 +1430,10 @@ smb2_ioctl_query_info(const unsigned int xid,
                        oparms.desired_access = GENERIC_WRITE;
                        break;
                }
+       } else if (qi.flags & PASSTHRU_SET_INFO) {
+               oparms.desired_access = GENERIC_WRITE;
+       } else {
+               oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
        }
 
        rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
@@ -1454,6 +1457,24 @@ smb2_ioctl_query_info(const unsigned int xid,
                                             qi.output_buffer_length,
                                             CIFSMaxBufSize);
                }
+       } else if (qi.flags == PASSTHRU_SET_INFO) {
+               /* Can eventually relax perm check since server enforces too */
+               if (!capable(CAP_SYS_ADMIN))
+                       rc = -EPERM;
+               else  {
+                       memset(&si_iov, 0, sizeof(si_iov));
+                       rqst[1].rq_iov = si_iov;
+                       rqst[1].rq_nvec = 1;
+
+                       size[0] = 8;
+                       data[0] = buffer;
+
+                       rc = SMB2_set_info_init(tcon, &rqst[1],
+                                       COMPOUND_FID, COMPOUND_FID,
+                                       current->tgid,
+                                       FILE_END_OF_FILE_INFORMATION,
+                                       SMB2_O_INFO_FILE, 0, data, size);
+               }
        } else if (qi.flags == PASSTHRU_QUERY_INFO) {
                memset(&qi_iov, 0, sizeof(qi_iov));
                rqst[1].rq_iov = qi_iov;