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[CIFS] Readpages and readir performance improvements - eliminate extra 

memcpy.  Part 1

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2005-12-02 13:32:45 -08:00
parent bf82067917
commit 84afc29b18
6 changed files with 71 additions and 23 deletions
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3
fs/cifs/CHANGES
View File

@ -1,6 +1,7 @@
Version 1.40
------------
Use fsuid (fsgid) more consistently instead of uid (gid).
Use fsuid (fsgid) more consistently instead of uid (gid). Improve performance
of readpages by eliminating one extra memcpy.
Version 1.39
------------

55
fs/cifs/cifsencrypt.c
View File

@ -1,7 +1,7 @@
/*
* fs/cifs/cifsencrypt.c
*
* Copyright (C) International Business Machines Corp., 2003
* Copyright (C) International Business Machines Corp., 2005
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
@ -82,6 +82,59 @@ int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
return rc;
}
static int cifs_calc_signature2(const struct kvec * iov, int n_vec,
const char * key, char * signature)
{
struct MD5Context context;
if((iov == NULL) || (signature == NULL))
return -EINVAL;
MD5Init(&context);
MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
/* MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); */ /* BB FIXME BB */
MD5Final(signature,&context);
return -EOPNOTSUPP;
/* return 0; */
}
int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server,
__u32 * pexpected_response_sequence_number)
{
int rc = 0;
char smb_signature[20];
struct smb_hdr * cifs_pdu = iov[0].iov_base;
if((cifs_pdu == NULL) || (server == NULL))
return -EINVAL;
if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
return rc;
spin_lock(&GlobalMid_Lock);
cifs_pdu->Signature.Sequence.SequenceNumber =
cpu_to_le32(server->sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
*pexpected_response_sequence_number = server->sequence_number++;
server->sequence_number++;
spin_unlock(&GlobalMid_Lock);
rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
smb_signature);
if(rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
return rc;
}
int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key,
__u32 expected_sequence_number)
{

6
fs/cifs/cifsproto.h
View File

@ -48,7 +48,7 @@ extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
struct smb_hdr * /* out */ ,
int * /* bytes returned */ , const int long_op);
extern int SendReceive2(const unsigned int /* xid */ , struct cifsSesInfo *,
struct kvec *, int /* nvec */,
struct kvec *, int /* nvec to send */,
int * /* bytes returned */ , const int long_op);
extern int checkSMBhdr(struct smb_hdr *smb, __u16 mid);
extern int checkSMB(struct smb_hdr *smb, __u16 mid, int length);
@ -237,12 +237,10 @@ extern int CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
const __u64 lseek, unsigned int *nbytes,
const char *buf, const char __user *ubuf,
const int long_op);
#ifdef CONFIG_CIFS_EXPERIMENTAL
extern int CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
const __u64 offset, unsigned int *nbytes,
struct kvec *iov, const int nvec, const int long_op);
#endif /* CONFIG_CIFS_EXPERIMENTAL */
extern int CIFSGetSrvInodeNumber(const int xid, struct cifsTconInfo *tcon,
const unsigned char *searchName, __u64 * inode_number,
const struct nls_table *nls_codepage,
@ -269,6 +267,8 @@ extern void tconInfoFree(struct cifsTconInfo *);
extern int cifs_reconnect(struct TCP_Server_Info *server);
extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *,__u32 *);
extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
__u32 *);
extern int cifs_verify_signature(struct smb_hdr *, const char * mac_key,
__u32 expected_sequence_number);
extern int cifs_calculate_mac_key(char * key,const char * rn,const char * pass);

3
fs/cifs/cifssmb.c
View File

@ -1155,7 +1155,6 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
return rc;
}
#ifdef CONFIG_CIFS_EXPERIMENTAL
int
CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
@ -1234,8 +1233,6 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
}
#endif /* CIFS_EXPERIMENTAL */
int
CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
const __u16 smb_file_id, const __u64 len,

6
fs/cifs/file.c
View File

@ -870,7 +870,6 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
if (rc != 0)
break;
}
#ifdef CONFIG_CIFS_EXPERIMENTAL
/* BB FIXME We can not sign across two buffers yet */
if((experimEnabled) && ((pTcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0)) {
@ -889,7 +888,6 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
iov, 1, long_op);
} else
/* BB FIXME fixup indentation of line below */
#endif
rc = CIFSSMBWrite(xid, pTcon,
open_file->netfid,
min_t(const int, cifs_sb->wsize,
@ -1026,7 +1024,6 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
return rc;
}
#ifdef CONFIG_CIFS_EXPERIMENTAL
static int cifs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
@ -1229,7 +1226,6 @@ retry:
return rc;
}
#endif
static int cifs_writepage(struct page* page, struct writeback_control *wbc)
{
@ -1875,9 +1871,7 @@ struct address_space_operations cifs_addr_ops = {
.readpage = cifs_readpage,
.readpages = cifs_readpages,
.writepage = cifs_writepage,
#ifdef CONFIG_CIFS_EXPERIMENTAL
.writepages = cifs_writepages,
#endif
.prepare_write = cifs_prepare_write,
.commit_write = cifs_commit_write,
.set_page_dirty = __set_page_dirty_nobuffers,

19
fs/cifs/transport.c
View File

@ -206,7 +206,6 @@ smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
return rc;
}
#ifdef CONFIG_CIFS_EXPERIMENTAL
static int
smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
struct sockaddr *sin)
@ -392,8 +391,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
return -ENOMEM;
}
/* BB FIXME */
/* rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); */
rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
midQ->midState = MID_REQUEST_SUBMITTED;
#ifdef CONFIG_CIFS_STATS2
@ -492,11 +490,17 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
if (midQ->resp_buf &&
(midQ->midState == MID_RESPONSE_RECEIVED)) {
in_buf->smb_buf_length = receive_len;
/* BB verify that length would not overrun small buf */
memcpy((char *)in_buf + 4,
(char *)midQ->resp_buf + 4,
receive_len);
if(receive_len > 500) {
/* use multiple buffers on way out */
} else {
memcpy((char *)in_buf + 4,
(char *)midQ->resp_buf + 4,
receive_len);
iov[0].iov_len = receive_len + 4;
iov[1].iov_len = 0;
}
dump_smb(in_buf, 80);
/* convert the length into a more usable form */
@ -549,7 +553,6 @@ out_unlock2:
return rc;
}
#endif /* CIFS_EXPERIMENTAL */
int
SendReceive(const unsigned int xid, struct cifsSesInfo *ses,