cifs: add function to set file disposition

cifs: add function to set file disposition

The proper way to set the delete on close bit on an already existing
file is to use SET_FILE_INFO with an infolevel of
SMB_FILE_DISPOSITION_INFO. Add a function to do that and have the
silly-rename code use it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 994de7c90474..7b365842bfa1 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -4876,6 +4876,61 @@ CIFSSMBSetFileInfo(const int xid, struct cifsTconInfo *tcon,
         return rc;
 }
 
+int
+CIFSSMBSetFileDisposition(const int xid, struct cifsTconInfo *tcon,
+                          bool delete_file, __u16 fid, __u32 pid_of_opener)
+{
+        struct smb_com_transaction2_sfi_req *pSMB  = NULL;
+        char *data_offset;
+        int rc = 0;
+        __u16 params, param_offset, offset, byte_count, count;
+
+        cFYI(1, ("Set File Disposition (via SetFileInfo)"));
+        rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
+
+        if (rc)
+                return rc;
+
+        pSMB->hdr.Pid = cpu_to_le16((__u16)pid_of_opener);
+        pSMB->hdr.PidHigh = cpu_to_le16((__u16)(pid_of_opener >> 16));
+
+        params = 6;
+        pSMB->MaxSetupCount = 0;
+        pSMB->Reserved = 0;
+        pSMB->Flags = 0;
+        pSMB->Timeout = 0;
+        pSMB->Reserved2 = 0;
+        param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
+        offset = param_offset + params;
+
+        data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
+
+        count = 1;
+        pSMB->MaxParameterCount = cpu_to_le16(2);
+        /* BB find max SMB PDU from sess */
+        pSMB->MaxDataCount = cpu_to_le16(1000);
+        pSMB->SetupCount = 1;
+        pSMB->Reserved3 = 0;
+        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
+        byte_count = 3 /* pad */  + params + count;
+        pSMB->DataCount = cpu_to_le16(count);
+        pSMB->ParameterCount = cpu_to_le16(params);
+        pSMB->TotalDataCount = pSMB->DataCount;
+        pSMB->TotalParameterCount = pSMB->ParameterCount;
+        pSMB->ParameterOffset = cpu_to_le16(param_offset);
+        pSMB->DataOffset = cpu_to_le16(offset);
+        pSMB->Fid = fid;
+        pSMB->InformationLevel = cpu_to_le16(SMB_SET_FILE_DISPOSITION_INFO);
+        pSMB->Reserved4 = 0;
+        pSMB->hdr.smb_buf_length += byte_count;
+        pSMB->ByteCount = cpu_to_le16(byte_count);
+        *data_offset = delete_file ? 1 : 0;
+        rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
+        if (rc)
+                cFYI(1, ("Send error in SetFileDisposition = %d", rc));
+
+        return rc;
+}
 
 int
 CIFSSMBSetPathInfo(const int xid, struct cifsTconInfo *tcon,