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提交 ec637e3f 编写于 作者: S Steve French
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[CIFS] Avoid extra large buffer allocation (and memcpy) in cifs_readpages 

Signed-off-by: NSteve French <sfrench@us.ibm.com>
上级 c89a86bb
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Showing with 156 addition and 108 deletion
fs/cifs/cifs_debug.c
浏览文件 @ ec637e3f
......@@ -401,8 +401,8 @@ static read_proc_t ntlmv2_enabled_read;
static write_proc_t ntlmv2_enabled_write;
static read_proc_t packet_signing_enabled_read;
static write_proc_t packet_signing_enabled_write;
static read_proc_t quotaEnabled_read;
static write_proc_t quotaEnabled_write;
static read_proc_t experimEnabled_read;
static write_proc_t experimEnabled_write;
static read_proc_t linuxExtensionsEnabled_read;
static write_proc_t linuxExtensionsEnabled_write;
......@@ -442,9 +442,9 @@ cifs_proc_init(void)
pde->write_proc = oplockEnabled_write;
pde = create_proc_read_entry("Experimental", 0, proc_fs_cifs,
quotaEnabled_read, NULL);
experimEnabled_read, NULL);
if (pde)
pde->write_proc = quotaEnabled_write;
pde->write_proc = experimEnabled_write;
pde = create_proc_read_entry("LinuxExtensionsEnabled", 0, proc_fs_cifs,
linuxExtensionsEnabled_read, NULL);
......@@ -586,14 +586,13 @@ oplockEnabled_write(struct file *file, const char __user *buffer,
}
static int
quotaEnabled_read(char *page, char **start, off_t off,
experimEnabled_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len;
len = sprintf(page, "%d\n", experimEnabled);
/* could also check if quotas are enabled in kernel
as a whole first */
len -= off;
*start = page + off;
......@@ -608,7 +607,7 @@ quotaEnabled_read(char *page, char **start, off_t off,
return len;
}
static int
quotaEnabled_write(struct file *file, const char __user *buffer,
experimEnabled_write(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
char c;
......@@ -621,6 +620,8 @@ quotaEnabled_write(struct file *file, const char __user *buffer,
experimEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
experimEnabled = 1;
else if (c == '2')
experimEnabled = 2;
return count;
}
......@@ -632,8 +633,6 @@ linuxExtensionsEnabled_read(char *page, char **start, off_t off,
int len;
len = sprintf(page, "%d\n", linuxExtEnabled);
/* could also check if quotas are enabled in kernel
as a whole first */
len -= off;
*start = page + off;
......
fs/cifs/cifsfs.c
浏览文件 @ ec637e3f
......@@ -733,7 +733,7 @@ cifs_init_request_bufs(void)
kmem_cache_destroy(cifs_req_cachep);
return -ENOMEM;
}
/* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
/* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
almost all handle based requests (but not write response, nor is it
sufficient for path based requests). A smaller size would have
been more efficient (compacting multiple slab items on one 4k page)
......@@ -742,7 +742,8 @@ cifs_init_request_bufs(void)
efficient to alloc 1 per page off the slab compared to 17K (5page)
alloc of large cifs buffers even when page debugging is on */
cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
NULL, NULL);
if (cifs_sm_req_cachep == NULL) {
mempool_destroy(cifs_req_poolp);
kmem_cache_destroy(cifs_req_cachep);
......
fs/cifs/cifsglob.h
浏览文件 @ ec637e3f
......@@ -285,6 +285,7 @@ struct cifs_search_info {
unsigned endOfSearch:1;
unsigned emptyDir:1;
unsigned unicode:1;
unsigned smallBuf:1; /* so we know which buf_release function to call */
};
struct cifsFileInfo {
......@@ -420,7 +421,12 @@ struct dir_notify_req {
#define MID_RESPONSE_RECEIVED 4
#define MID_RETRY_NEEDED 8 /* session closed while this request out */
#define MID_NO_RESP_NEEDED 0x10
#define MID_SMALL_BUFFER 0x20 /* 112 byte response buffer instead of 4K */
/* Types of response buffer returned from SendReceive2 */
#define CIFS_NO_BUFFER 0 /* Response buffer not returned */
#define CIFS_SMALL_BUFFER 1
#define CIFS_LARGE_BUFFER 2
#define CIFS_IOVEC 4 /* array of response buffers */
/*
*****************************************************************
......
fs/cifs/cifspdu.h
浏览文件 @ ec637e3f
......@@ -80,7 +80,11 @@
#define NT_TRANSACT_GET_USER_QUOTA 0x07
#define NT_TRANSACT_SET_USER_QUOTA 0x08
#define MAX_CIFS_HDR_SIZE 256 /* is future chained NTCreateXReadX bigger? */
#define MAX_CIFS_SMALL_BUFFER_SIZE 448 /* big enough for most */
/* future chained NTCreateXReadX bigger, but for time being NTCreateX biggest */
/* among the requests (NTCreateX response is bigger with wct of 34) */
#define MAX_CIFS_HDR_SIZE 0x58 /* 4 len + 32 hdr + (2*24 wct) + 2 bct + 2 pad */
#define CIFS_SMALL_PATH 120 /* allows for (448-88)/3 */
/* internal cifs vfs structures */
/*****************************************************************
......
fs/cifs/cifsproto.h
浏览文件 @ ec637e3f
......@@ -49,7 +49,7 @@ extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
int * /* bytes returned */ , const int long_op);
extern int SendReceive2(const unsigned int /* xid */ , struct cifsSesInfo *,
struct kvec *, int /* nvec to send */,
int * /* bytes returned */ , const int long_op);
int * /* type of buf 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);
extern int is_valid_oplock_break(struct smb_hdr *smb);
......@@ -94,7 +94,8 @@ extern int CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
extern int CIFSFindFirst(const int xid, struct cifsTconInfo *tcon,
const char *searchName, const struct nls_table *nls_codepage,
__u16 *searchHandle, struct cifs_search_info * psrch_inf, int map, const char dirsep);
__u16 *searchHandle, struct cifs_search_info * psrch_inf,
int map, const char dirsep);
extern int CIFSFindNext(const int xid, struct cifsTconInfo *tcon,
__u16 searchHandle, struct cifs_search_info * psrch_inf);
......@@ -231,7 +232,8 @@ extern int CIFSSMBClose(const int xid, struct cifsTconInfo *tcon,
extern int CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf);
const __u64 lseek, unsigned int *nbytes, char **buf,
int * return_buf_type);
extern int CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
const __u64 lseek, unsigned int *nbytes,
......
fs/cifs/cifssmb.c
浏览文件 @ ec637e3f
......@@ -958,21 +958,19 @@ CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
return rc;
}
/* If no buffer passed in, then caller wants to do the copy
as in the case of readpages so the SMB buffer must be
freed by the caller */
int
CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf)
const __u64 lseek, unsigned int *nbytes, char **buf,
int * pbuf_type)
{
int rc = -EACCES;
READ_REQ *pSMB = NULL;
READ_RSP *pSMBr = NULL;
char *pReadData = NULL;
int bytes_returned;
int wct;
int resp_buf_type = 0;
struct kvec iov[1];
cFYI(1,("Reading %d bytes on fid %d",count,netfid));
if(tcon->ses->capabilities & CAP_LARGE_FILES)
......@@ -981,8 +979,7 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
wct = 10; /* old style read */
*nbytes = 0;
rc = smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB,
(void **) &pSMBr);
rc = small_smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB);
if (rc)
return rc;
......@@ -1010,9 +1007,13 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
pSMBW->ByteCount = 0;
}
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
iov[0].iov_base = (char *)pSMB;
iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
rc = SendReceive2(xid, tcon->ses, iov,
1 /* num iovecs */,
&resp_buf_type, 0);
cifs_stats_inc(&tcon->num_reads);
pSMBr = (READ_RSP *)iov[0].iov_base;
if (rc) {
cERROR(1, ("Send error in read = %d", rc));
} else {
......@@ -1028,8 +1029,7 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
rc = -EIO;
*nbytes = 0;
} else {
pReadData =
(char *) (&pSMBr->hdr.Protocol) +
pReadData = (char *) (&pSMBr->hdr.Protocol) +
le16_to_cpu(pSMBr->DataOffset);
/* if(rc = copy_to_user(buf, pReadData, data_length)) {
cERROR(1,("Faulting on read rc = %d",rc));
......@@ -1039,16 +1039,27 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
memcpy(*buf,pReadData,data_length);
}
}
if(*buf)
cifs_buf_release(pSMB);
else
*buf = (char *)pSMB;
cifs_small_buf_release(pSMB);
if(*buf) {
if(resp_buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(iov[0].iov_base);
else if(resp_buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(iov[0].iov_base);
} else /* return buffer to caller to free */ /* BB FIXME how do we tell caller if it is not a large buffer */ {
*buf = iov[0].iov_base;
if(resp_buf_type == CIFS_SMALL_BUFFER)
*pbuf_type = CIFS_SMALL_BUFFER;
else if(resp_buf_type == CIFS_LARGE_BUFFER)
*pbuf_type = CIFS_LARGE_BUFFER;
}
/* Note: On -EAGAIN error only caller can retry on handle based calls
since file handle passed in no longer valid */
return rc;
}
int
CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
......@@ -1163,10 +1174,10 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
{
int rc = -EACCES;
WRITE_REQ *pSMB = NULL;
int bytes_returned, wct;
int wct;
int smb_hdr_len;
int resp_buf_type = 0;
/* BB removeme BB */
cFYI(1,("write2 at %lld %d bytes", (long long)offset, count));
if(tcon->ses->capabilities & CAP_LARGE_FILES)
......@@ -1209,22 +1220,34 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
pSMBW->ByteCount = cpu_to_le16(count + 5);
}
iov[0].iov_base = pSMB;
if(wct == 14)
iov[0].iov_len = smb_hdr_len + 4;
else /* wct == 12 pad bigger by four bytes */
iov[0].iov_len = smb_hdr_len + 8;
rc = SendReceive2(xid, tcon->ses, iov, n_vec + 1, &bytes_returned,
rc = SendReceive2(xid, tcon->ses, iov, n_vec + 1, &resp_buf_type,
long_op);
cifs_stats_inc(&tcon->num_writes);
if (rc) {
cFYI(1, ("Send error Write2 = %d", rc));
*nbytes = 0;
} else if(resp_buf_type == 0) {
/* presumably this can not happen, but best to be safe */
rc = -EIO;
*nbytes = 0;
} else {
WRITE_RSP * pSMBr = (WRITE_RSP *)pSMB;
WRITE_RSP * pSMBr = (WRITE_RSP *)iov[0].iov_base;
*nbytes = le16_to_cpu(pSMBr->CountHigh);
*nbytes = (*nbytes) << 16;
*nbytes += le16_to_cpu(pSMBr->Count);
}
cifs_small_buf_release(pSMB);
if(resp_buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(iov[0].iov_base);
else if(resp_buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(iov[0].iov_base);
/* Note: On -EAGAIN error only caller can retry on handle based calls
since file handle passed in no longer valid */
......
fs/cifs/connect.c
浏览文件 @ ec637e3f
......@@ -514,7 +514,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
/* else length ok */
reconnect = 0;
if(pdu_length > MAX_CIFS_HDR_SIZE - 4) {
if(pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
isLargeBuf = TRUE;
memcpy(bigbuf, smallbuf, 4);
smb_buffer = bigbuf;
......
fs/cifs/file.c
浏览文件 @ ec637e3f
......@@ -555,13 +555,13 @@ int cifs_closedir(struct inode *inode, struct file *file)
}
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
if (ptmp) {
/* BB removeme BB */ cFYI(1, ("freeing smb buf in srch struct in closedir"));
cFYI(1, ("closedir free smb buf in srch struct"));
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
cifs_buf_release(ptmp);
}
ptmp = pCFileStruct->search_resume_name;
if (ptmp) {
/* BB removeme BB */ cFYI(1, ("freeing resume name in closedir"));
cFYI(1, ("closedir free resume name"));
pCFileStruct->search_resume_name = NULL;
kfree(ptmp);
}
......@@ -871,8 +871,8 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
break;
}
/* BB FIXME We can not sign across two buffers yet */
if((experimEnabled) && ((pTcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0)) {
if((pTcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0) {
struct kvec iov[2];
unsigned int len;
......@@ -1424,6 +1424,7 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
rc = -EAGAIN;
smb_read_data = NULL;
while (rc == -EAGAIN) {
int buf_type = CIFS_NO_BUFFER;
if ((open_file->invalidHandle) &&
(!open_file->closePend)) {
rc = cifs_reopen_file(file->f_dentry->d_inode,
......@@ -1434,17 +1435,19 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
rc = CIFSSMBRead(xid, pTcon,
open_file->netfid,
current_read_size, *poffset,
&bytes_read, &smb_read_data);
&bytes_read, &smb_read_data,
&buf_type);
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
if (copy_to_user(current_offset,
smb_read_data + 4 /* RFC1001 hdr */
+ le16_to_cpu(pSMBr->DataOffset),
bytes_read)) {
rc = -EFAULT;
FreeXid(xid);
return rc;
}
if (smb_read_data) {
if(buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(smb_read_data);
else if(buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
......@@ -1478,6 +1481,7 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
int xid;
char *current_offset;
struct cifsFileInfo *open_file;
int buf_type = CIFS_NO_BUFFER;
xid = GetXid();
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
......@@ -1516,7 +1520,8 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
rc = CIFSSMBRead(xid, pTcon,
open_file->netfid,
current_read_size, *poffset,
&bytes_read, &current_offset);
&bytes_read, &current_offset,
&buf_type);
}
if (rc || (bytes_read == 0)) {
if (total_read) {
......@@ -1614,6 +1619,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
struct smb_com_read_rsp *pSMBr;
struct pagevec lru_pvec;
struct cifsFileInfo *open_file;
int buf_type = CIFS_NO_BUFFER;
xid = GetXid();
if (file->private_data == NULL) {
......@@ -1672,11 +1678,14 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
rc = CIFSSMBRead(xid, pTcon,
open_file->netfid,
read_size, offset,
&bytes_read, &smb_read_data);
&bytes_read, &smb_read_data,
&buf_type);
/* BB more RC checks ? */
if (rc== -EAGAIN) {
if (smb_read_data) {
if(buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(smb_read_data);
else if(buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
......@@ -1734,6 +1743,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
break;
}
if (smb_read_data) {
if(buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(smb_read_data);
else if(buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
......
fs/cifs/inode.c
浏览文件 @ ec637e3f
......@@ -229,11 +229,12 @@ static int decode_sfu_inode(struct inode * inode, __u64 size,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc==0) {
int buf_type = CIFS_NO_BUFFER;
/* Read header */
rc = CIFSSMBRead(xid, pTcon,
netfid,
24 /* length */, 0 /* offset */,
&bytes_read, &pbuf);
&bytes_read, &pbuf, &buf_type);
if((rc == 0) && (bytes_read >= 8)) {
if(memcmp("IntxBLK", pbuf, 8) == 0) {
cFYI(1,("Block device"));
......
fs/cifs/misc.c
浏览文件 @ ec637e3f
......@@ -299,7 +299,7 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
struct cifsSesInfo * ses;
char *temp = (char *) buffer;
memset(temp,0,MAX_CIFS_HDR_SIZE);
memset(temp,0,256); /* bigger than MAX_CIFS_HDR_SIZE */
buffer->smb_buf_length =
(2 * word_count) + sizeof (struct smb_hdr) -
......
fs/cifs/transport.c
浏览文件 @ ec637e3f
......@@ -298,7 +298,7 @@ smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
int
SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
struct kvec *iov, int n_vec, int *pbytes_returned,
struct kvec *iov, int n_vec, int * pRespBufType /* ret */,
const int long_op)
{
int rc = 0;
......@@ -307,6 +307,8 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
struct mid_q_entry *midQ;
struct smb_hdr *in_buf = iov[0].iov_base;
*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
if (ses == NULL) {
cERROR(1,("Null smb session"));
return -EIO;
......@@ -491,23 +493,20 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
if (midQ->resp_buf &&
(midQ->midState == MID_RESPONSE_RECEIVED)) {
in_buf->smb_buf_length = 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_base = (char *)midQ->resp_buf;
if(midQ->largeBuf)
*pRespBufType = CIFS_LARGE_BUFFER;
else
*pRespBufType = CIFS_SMALL_BUFFER;
iov[0].iov_len = receive_len + 4;
iov[1].iov_len = 0;
}
dump_smb(in_buf, 80);
dump_smb(midQ->resp_buf, 80);
/* convert the length into a more usable form */
if((receive_len > 24) &&
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(in_buf,
rc = cifs_verify_signature(midQ->resp_buf,
ses->server->mac_signing_key,
midQ->sequence_number+1);
if(rc) {
......@@ -516,18 +515,19 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
}
}
*pbytes_returned = in_buf->smb_buf_length;
/* BB special case reconnect tid and uid here? */
/* BB special case Errbadpassword and pwdexpired here */
rc = map_smb_to_linux_error(in_buf);
rc = map_smb_to_linux_error(midQ->resp_buf);
/* convert ByteCount if necessary */
if (receive_len >=
sizeof (struct smb_hdr) -
4 /* do not count RFC1001 header */ +
(2 * in_buf->WordCount) + 2 /* bcc */ )
BCC(in_buf) = le16_to_cpu(BCC_LE(in_buf));
(2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
BCC(midQ->resp_buf) =
le16_to_cpu(BCC_LE(midQ->resp_buf));
midQ->resp_buf = NULL; /* mark it so will not be freed
by DeleteMidQEntry */
} else {
rc = -EIO;
cFYI(1,("Bad MID state?"));
......@@ -793,7 +793,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
} else {
rc = -EIO;
cERROR(1,("Bad MID state? "));
cERROR(1,("Bad MID state?"));
}
}
cifs_no_response_exit:
......
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