[CIFS] New CIFS POSIX mkdir performance improvement
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 48fc0c2..a7d3d8e 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 @@
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;