cifs: add a CIFSSMBUnixQFileInfo function

...to allow us to get unix attrs via filehandle.

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

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index bf2bff1..ce9199f 100644 (file)
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -154,6 +154,8 @@ extern int SMBQueryInformation(const int xid, struct cifsTconInfo *tcon,
                        FILE_ALL_INFO *findData,
                        const struct nls_table *nls_codepage, int remap);
 
+extern int CIFSSMBUnixQFileInfo(const int xid, struct cifsTconInfo *tcon,
+                       u16 netfid, FILE_UNIX_BASIC_INFO *pFindData);
 extern int CIFSSMBUnixQPathInfo(const int xid,
                        struct cifsTconInfo *tcon,
                        const unsigned char *searchName,

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 4ed9782..903d538 100644 (file)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3398,6 +3398,75 @@ QPathInfoRetry:
        return rc;
 }
 
+int
+CIFSSMBUnixQFileInfo(const int xid, struct cifsTconInfo *tcon,
+                u16 netfid, FILE_UNIX_BASIC_INFO *pFindData)
+{
+       struct smb_t2_qfi_req *pSMB = NULL;
+       struct smb_t2_qfi_rsp *pSMBr = NULL;
+       int rc = 0;
+       int bytes_returned;
+       __u16 params, byte_count;
+
+UnixQFileInfoRetry:
+       rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+                     (void **) &pSMBr);
+       if (rc)
+               return rc;
+
+       params = 2 /* level */ + 2 /* fid */;
+       pSMB->t2.TotalDataCount = 0;
+       pSMB->t2.MaxParameterCount = cpu_to_le16(4);
+       /* BB find exact max data count below from sess structure BB */
+       pSMB->t2.MaxDataCount = cpu_to_le16(CIFSMaxBufSize);
+       pSMB->t2.MaxSetupCount = 0;
+       pSMB->t2.Reserved = 0;
+       pSMB->t2.Flags = 0;
+       pSMB->t2.Timeout = 0;
+       pSMB->t2.Reserved2 = 0;
+       pSMB->t2.ParameterOffset = cpu_to_le16(offsetof(struct smb_t2_qfi_req,
+                                              Fid) - 4);
+       pSMB->t2.DataCount = 0;
+       pSMB->t2.DataOffset = 0;
+       pSMB->t2.SetupCount = 1;
+       pSMB->t2.Reserved3 = 0;
+       pSMB->t2.SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
+       byte_count = params + 1 /* pad */ ;
+       pSMB->t2.TotalParameterCount = cpu_to_le16(params);
+       pSMB->t2.ParameterCount = pSMB->t2.TotalParameterCount;
+       pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_FILE_UNIX_BASIC);
+       pSMB->Pad = 0;
+       pSMB->Fid = netfid;
+       pSMB->hdr.smb_buf_length += byte_count;
+
+       rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+                        (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+       if (rc) {
+               cFYI(1, ("Send error in QPathInfo = %d", rc));
+       } else {                /* decode response */
+               rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+
+               if (rc || (pSMBr->ByteCount < sizeof(FILE_UNIX_BASIC_INFO))) {
+                       cERROR(1, ("Malformed FILE_UNIX_BASIC_INFO response.\n"
+                                  "Unix Extensions can be disabled on mount "
+                                  "by specifying the nosfu mount option."));
+                       rc = -EIO;      /* bad smb */
+               } else {
+                       __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+                       memcpy((char *) pFindData,
+                              (char *) &pSMBr->hdr.Protocol +
+                              data_offset,
+                              sizeof(FILE_UNIX_BASIC_INFO));
+               }
+       }
+
+       cifs_buf_release(pSMB);
+       if (rc == -EAGAIN)
+               goto UnixQFileInfoRetry;
+
+       return rc;
+}
+
 int
 CIFSSMBUnixQPathInfo(const int xid, struct cifsTconInfo *tcon,
                     const unsigned char *searchName,