[CIFS] New CIFS POSIX mkdir performance improvement

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 124 insertions, 3 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 48fc0c2ab0e5..a7d3d8e5c6c5 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1,7 +1,7 @@
 /*
  *   fs/cifs/cifssmb.c
  *
- *   Copyright (C) International Business Machines  Corp., 2002,2006
+ *   Copyright (C) International Business Machines  Corp., 2002,2007
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  *   Contains the routines for constructing the SMB PDUs themselves
@@ -24,8 +24,8 @@
  /* SMB/CIFS PDU handling routines here - except for leftovers in connect.c   */
  /* These are mostly routines that operate on a pathname, or on a tree id     */
  /* (mounted volume), but there are eight handle based routines which must be */
- /* treated slightly different for reconnection purposes since we never want  */
- /* to reuse a stale file handle and the caller knows the file handle */
+ /* treated slightly differently for reconnection purposes since we never     */
+ /* want to reuse a stale file handle and only the caller knows the file info */
 
 #include <linux/fs.h>
 #include <linux/kernel.h>
@@ -913,6 +913,127 @@ MkDirRetry:
         return rc;
 }
 
+int
+CIFSPOSIXCreate(const int xid, struct cifsTconInfo *tcon, __u32 posix_flags,
+                __u64 mode, __u16 * netfid, FILE_UNIX_BASIC_INFO *pRetData,
+                __u32 *pOplock, const char *name, 
+                const struct nls_table *nls_codepage, int remap)
+{
+        TRANSACTION2_SPI_REQ *pSMB = NULL;
+        TRANSACTION2_SPI_RSP *pSMBr = NULL;
+        int name_len;
+        int rc = 0;
+        int bytes_returned = 0;
+        char *data_offset;
+        __u16 params, param_offset, offset, byte_count, count;
+        OPEN_PSX_REQ * pdata;
+        OPEN_PSX_RSP * psx_rsp;
+
+        cFYI(1, ("In POSIX Create"));
+PsxCreat:
+        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+                      (void **) &pSMBr);
+        if (rc)
+                return rc;
+
+        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
+                name_len =
+                    cifsConvertToUCS((__le16 *) pSMB->FileName, name,
+                                     PATH_MAX, nls_codepage, remap);
+                name_len++;     /* trailing null */
+                name_len *= 2;
+        } else {        /* BB improve the check for buffer overruns BB */
+                name_len = strnlen(name, PATH_MAX);
+                name_len++;     /* trailing null */
+                strncpy(pSMB->FileName, name, name_len);
+        }
+
+        params = 6 + name_len;
+        count = sizeof(OPEN_PSX_REQ);
+        pSMB->MaxParameterCount = cpu_to_le16(2);
+        pSMB->MaxDataCount = cpu_to_le16(1000); /* large enough */
+        pSMB->MaxSetupCount = 0;
+        pSMB->Reserved = 0;
+        pSMB->Flags = 0;
+        pSMB->Timeout = 0;
+        pSMB->Reserved2 = 0;
+        param_offset = offsetof(struct smb_com_transaction2_spi_req,
+                                     InformationLevel) - 4;
+        offset = param_offset + params;
+        data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
+        pdata = (OPEN_PSX_REQ *)(((char *)&pSMB->hdr.Protocol) + offset);
+        pdata->Level = SMB_QUERY_FILE_UNIX_BASIC;
+        pdata->Permissions = cpu_to_le64(mode);
+        pdata->PosixOpenFlags = cpu_to_le32(posix_flags); 
+        pdata->OpenFlags =  cpu_to_le32(*pOplock);
+        pSMB->ParameterOffset = cpu_to_le16(param_offset);
+        pSMB->DataOffset = cpu_to_le16(offset);
+        pSMB->SetupCount = 1;
+        pSMB->Reserved3 = 0;
+        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_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->InformationLevel = cpu_to_le16(SMB_POSIX_OPEN);
+        pSMB->Reserved4 = 0;
+        pSMB->hdr.smb_buf_length += byte_count; 
+        pSMB->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, ("Posix create returned %d", rc));
+                goto psx_create_err;
+        }
+
+        cFYI(1,("copying inode info"));
+        rc = validate_t2((struct smb_t2_rsp *)pSMBr);
+
+        if (rc || (pSMBr->ByteCount < sizeof(OPEN_PSX_RSP))) {
+                rc = -EIO;      /* bad smb */
+                goto psx_create_err;
+        }
+
+        /* copy return information to pRetData */
+        psx_rsp = (OPEN_PSX_RSP *)((char *) &pSMBr->hdr.Protocol 
+                        + le16_to_cpu(pSMBr->t2.DataOffset));
+                
+        *pOplock = le16_to_cpu(psx_rsp->OplockFlags);
+        if(netfid)
+                *netfid = psx_rsp->Fid;   /* cifs fid stays in le */
+        /* Let caller know file was created so we can set the mode. */
+        /* Do we care about the CreateAction in any other cases? */
+        if(cpu_to_le32(FILE_CREATE) == psx_rsp->CreateAction)
+                *pOplock |= CIFS_CREATE_ACTION;
+        /* check to make sure response data is there */
+        if(psx_rsp->ReturnedLevel != SMB_QUERY_FILE_UNIX_BASIC)
+                pRetData->Type = -1; /* unknown */              
+        else {
+                if(pSMBr->ByteCount < sizeof(OPEN_PSX_RSP) 
+                                        + sizeof(FILE_UNIX_BASIC_INFO)) {
+                        cERROR(1,("Open response data too small"));
+                        pRetData->Type = -1;
+                        goto psx_create_err;
+                }
+                memcpy((char *) pRetData, 
+                        (char *)&psx_rsp + sizeof(OPEN_PSX_RSP),
+                        sizeof (FILE_UNIX_BASIC_INFO));
+        }
+                        
+
+psx_create_err:
+        cifs_buf_release(pSMB);
+
+        cifs_stats_inc(&tcon->num_mkdirs);
+
+        if (rc == -EAGAIN)
+                goto PsxCreat;
+
+        return rc;      
+}
+
 static __u16 convert_disposition(int disposition)
 {
         __u16 ofun = 0;