[PATCH 4/4] cifs: add function to set file disposition

[Jeff Layton <jlayton@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 fs/cifs/cifsproto.h |    2 +
 fs/cifs/cifssmb.c   |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/cifs/inode.c     |    9 ++++++-
 3 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index bee053f..0cff7fe 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -179,6 +179,8 @@ extern int CIFSSMBSetPathInfo(const int xid, struct cifsTconInfo *tcon,
 extern int CIFSSMBSetFileInfo(const int xid, struct cifsTconInfo *tcon,
 			const FILE_BASIC_INFO *data, __u16 fid,
 			__u32 pid_of_opener);
+extern int CIFSSMBSetFileDisposition(const int xid, struct cifsTconInfo *tcon,
+			bool delete_file, __u16 fid, __u32 pid_of_opener);
 #if 0
 extern int CIFSSMBSetAttrLegacy(int xid, struct cifsTconInfo *tcon,
 			char *fileName, __u16 dos_attributes,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 3d68e28..7504d15 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,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 03fde14..2f508a3 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -685,8 +685,7 @@ cifs_silly_rename(char *full_path, struct inode *inode, int xid)
 	FILE_BASIC_INFO *info_buf;
 
 	rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
-			 DELETE|FILE_WRITE_ATTRIBUTES,
-			 CREATE_NOT_DIR|CREATE_DELETE_ON_CLOSE,
+			 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 			 &netfid, &oplock, NULL, cifs_sb->local_nls,
 			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 	if (rc != 0)
@@ -714,6 +713,12 @@ cifs_silly_rename(char *full_path, struct inode *inode, int xid)
 	rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 				   cifs_sb->mnt_cifs_flags &
 					    CIFS_MOUNT_MAP_SPECIAL_CHR);
+	if (rc != 0)
+		goto out_close;
+
+	/* set DELETE_ON_CLOSE */
+	rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
+
 out_close:
 	CIFSSMBClose(xid, tcon, netfid);
 out:
-- 
1.5.5.1

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