[PATCH] cifs: add support for chattr/lsattr in new CIFS POSIX extensions

Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 85 insertions, 1 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index df6a619a6821..36d3c128a58b 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2072,7 +2072,91 @@ setACLerrorExit:
         return rc;
 }
 
-#endif
+/* BB fix tabs in this function FIXME BB */
+int
+CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon,
+                const int netfid, __u64 * pExtAttrBits, __u64 *pMask)
+{
+        int rc = 0;
+        struct smb_t2_qfi_req *pSMB = NULL;
+        struct smb_t2_qfi_rsp *pSMBr = NULL;
+        int bytes_returned;
+        __u16 params, byte_count;
+
+        cFYI(1,("In GetExtAttr"));
+        if(tcon == NULL)
+                return -ENODEV;
+
+GetExtAttrRetry:
+        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+                      (void **) &pSMBr);
+        if (rc)
+                return rc;
+
+        params = 2 /* level */ +2 /* fid */ + 2 /* rsrvd */;
+        pSMB->t2.TotalDataCount = 0;
+        pSMB->t2.MaxParameterCount = cpu_to_le16(2);
+        /* BB find exact max data count below from sess structure BB */
+        pSMB->t2.MaxDataCount = cpu_to_le16(4000);
+        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_com_transaction2_qpi_req ,InformationLevel) - 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 + 3 /* pad */ ;
+        pSMB->t2.TotalParameterCount = cpu_to_le16(params);
+        pSMB->t2.ParameterCount = pSMB->t2.TotalParameterCount;
+        pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_ATTR_FLAGS);
+        pSMB->Pad1 = 0;
+        pSMB->Pad2 = 0;
+        pSMB->Fid = netfid;
+        pSMB->hdr.smb_buf_length += byte_count;
+        pSMB->t2.ByteCount = cpu_to_le16(byte_count);
+
+        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+                (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+        if (rc) {
+                cFYI(1, ("error %d in GetExtAttr", rc));
+        } else {
+                /* decode response */
+                rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+                if (rc || (pSMBr->ByteCount < 2))
+                /* BB also check enough total bytes returned */
+                        /* If rc should we check for EOPNOSUPP and
+                        disable the srvino flag? or in caller? */
+                        rc = -EIO;      /* bad smb */
+                else {
+                        __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+                        __u16 count = le16_to_cpu(pSMBr->t2.DataCount);
+                        struct file_chattr_info * pfinfo;
+                        /* BB Do we need a cast or hash here ? */
+                        if(count != 16) {
+                                cFYI(1, ("Illegal size ret in GetExtAttr"));
+                                rc = -EIO;
+                                goto GetExtAttrOut;
+                        }
+                        pfinfo = (struct file_chattr_info *)
+                                (data_offset + (char *) &pSMBr->hdr.Protocol);
+                        *pExtAttrBits = le64_to_cpu(pfinfo->mode);
+                        *pMask = le64_to_cpu(pfinfo->mask);
+                }
+        }
+GetExtAttrOut:
+        cifs_buf_release(pSMB);
+        if (rc == -EAGAIN)
+                goto GetExtAttrRetry;
+        return rc;
+}
+
+
+#endif /* CONFIG_POSIX */
 
 int
 CIFSSMBQPathInfo(const int xid, struct cifsTconInfo *tcon,