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Merge branch 'cifs-3.2' of git://git.samba.org/jlayton/linux into temp-3.2-jeff

wifi-calibration
Steve French 2011-10-19 21:22:41 -05:00
parent 71c424bac5 f06ac72e92
commit fbcae3ea16
9 changed files with 899 additions and 370 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/cifsfs.c
View File

@ -74,7 +74,7 @@ module_param(cifs_min_small, int, 0);
MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
"Range: 2 to 256");
unsigned int cifs_max_pending = CIFS_MAX_REQ;
module_param(cifs_max_pending, int, 0);
module_param(cifs_max_pending, int, 0444);
MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
"Default: 50 Range: 2 to 256");
unsigned short echo_retries = 5;

29
fs/cifs/cifsglob.h
View File

@ -291,7 +291,13 @@ struct TCP_Server_Info {
bool sec_kerberosu2u; /* supports U2U Kerberos */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool large_buf; /* is current buffer large? */
struct delayed_work echo; /* echo ping workqueue job */
struct kvec *iov; /* reusable kvec array for receives */
unsigned int nr_iov; /* number of kvecs in array */
char *smallbuf; /* pointer to current "small" buffer */
char *bigbuf; /* pointer to current "big" buffer */
unsigned int total_read; /* total amount of data read in this pass */
#ifdef CONFIG_CIFS_FSCACHE
struct fscache_cookie *fscache; /* client index cache cookie */
#endif
@ -650,8 +656,24 @@ static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
struct mid_q_entry;
/*
* This is the prototype for the mid callback function. When creating one,
* take special care to avoid deadlocks. Things to bear in mind:
* This is the prototype for the mid receive function. This function is for
* receiving the rest of the SMB frame, starting with the WordCount (which is
* just after the MID in struct smb_hdr). Note:
*
* - This will be called by cifsd, with no locks held.
* - The mid will still be on the pending_mid_q.
* - mid->resp_buf will point to the current buffer.
*
* Returns zero on a successful receive, or an error. The receive state in
* the TCP_Server_Info will also be updated.
*/
typedef int (mid_receive_t)(struct TCP_Server_Info *server,
struct mid_q_entry *mid);
/*
* This is the prototype for the mid callback function. This is called once the
* mid has been received off of the socket. When creating one, take special
* care to avoid deadlocks. Things to bear in mind:
*
* - it will be called by cifsd, with no locks held
* - the mid will be removed from any lists
@ -669,9 +691,10 @@ struct mid_q_entry {
unsigned long when_sent; /* time when smb send finished */
unsigned long when_received; /* when demux complete (taken off wire) */
#endif
mid_receive_t *receive; /* call receive callback */
mid_callback_t *callback; /* call completion callback */
void *callback_data; /* general purpose pointer for callback */
struct smb_hdr *resp_buf; /* response buffer */
struct smb_hdr *resp_buf; /* pointer to received SMB header */
int midState; /* wish this were enum but can not pass to wait_event */
__u8 command; /* smb command code */
bool largeBuf:1; /* if valid response, is pointer to large buf */

4
fs/cifs/cifspdu.h
View File

@ -1089,9 +1089,7 @@ typedef struct smb_com_read_rsp {
__le16 DataLengthHigh;
__u64 Reserved2;
__u16 ByteCount;
__u8 Pad; /* BB check for whether padded to DWORD
boundary and optimum performance here */
char Data[1];
/* read response data immediately follows */
} __attribute__((packed)) READ_RSP;
typedef struct locking_andx_range {

29
fs/cifs/cifsproto.h
View File

@ -69,8 +69,9 @@ extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,
struct TCP_Server_Info *server);
extern void DeleteMidQEntry(struct mid_q_entry *midEntry);
extern int cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int nvec, mid_callback_t *callback,
void *cbdata, bool ignore_pend);
unsigned int nvec, mid_receive_t *receive,
mid_callback_t *callback, void *cbdata,
bool ignore_pend);
extern int SendReceive(const unsigned int /* xid */ , struct cifs_ses *,
struct smb_hdr * /* input */ ,
struct smb_hdr * /* out */ ,
@ -153,6 +154,12 @@ extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *,
extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *,
const char *, int);
extern void dequeue_mid(struct mid_q_entry *mid, bool malformed);
extern int cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read);
extern int cifs_readv_from_socket(struct TCP_Server_Info *server,
struct kvec *iov_orig, unsigned int nr_segs,
unsigned int to_read);
extern void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
struct cifs_sb_info *cifs_sb);
extern int cifs_match_super(struct super_block *, void *);
@ -442,6 +449,24 @@ extern int E_md4hash(const unsigned char *passwd, unsigned char *p16);
extern int SMBencrypt(unsigned char *passwd, const unsigned char *c8,
unsigned char *p24);
/* asynchronous read support */
struct cifs_readdata {
struct cifsFileInfo *cfile;
struct address_space *mapping;
__u64 offset;
unsigned int bytes;
pid_t pid;
int result;
struct list_head pages;
struct work_struct work;
unsigned int nr_iov;
struct kvec iov[1];
};
struct cifs_readdata *cifs_readdata_alloc(unsigned int nr_pages);
void cifs_readdata_free(struct cifs_readdata *rdata);
int cifs_async_readv(struct cifs_readdata *rdata);
/* asynchronous write support */
struct cifs_writedata {
struct kref refcount;

364
fs/cifs/cifssmb.c
View File

@ -33,6 +33,8 @@
#include <linux/slab.h>
#include <linux/posix_acl_xattr.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/task_io_accounting_ops.h>
#include <asm/uaccess.h>
#include "cifspdu.h"
#include "cifsglob.h"
@ -40,6 +42,7 @@
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "fscache.h"
#ifdef CONFIG_CIFS_POSIX
static struct {
@ -83,6 +86,9 @@ static struct {
#endif /* CONFIG_CIFS_WEAK_PW_HASH */
#endif /* CIFS_POSIX */
/* Forward declarations */
static void cifs_readv_complete(struct work_struct *work);
/* Mark as invalid, all open files on tree connections since they
were closed when session to server was lost */
static void mark_open_files_invalid(struct cifs_tcon *pTcon)
@ -737,7 +743,8 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
iov.iov_base = smb;
iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
rc = cifs_call_async(server, &iov, 1, cifs_echo_callback, server, true);
rc = cifs_call_async(server, &iov, 1, NULL, cifs_echo_callback,
server, true);
if (rc)
cFYI(1, "Echo request failed: %d", rc);
@ -1374,6 +1381,359 @@ openRetry:
return rc;
}
struct cifs_readdata *
cifs_readdata_alloc(unsigned int nr_pages)
{
struct cifs_readdata *rdata;
/* readdata + 1 kvec for each page */
rdata = kzalloc(sizeof(*rdata) +
sizeof(struct kvec) * nr_pages, GFP_KERNEL);
if (rdata != NULL) {
INIT_WORK(&rdata->work, cifs_readv_complete);
INIT_LIST_HEAD(&rdata->pages);
}
return rdata;
}
void
cifs_readdata_free(struct cifs_readdata *rdata)
{
cifsFileInfo_put(rdata->cfile);
kfree(rdata);
}
/*
* Discard any remaining data in the current SMB. To do this, we borrow the
* current bigbuf.
*/
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
READ_RSP *rsp = (READ_RSP *)server->smallbuf;
unsigned int rfclen = be32_to_cpu(rsp->hdr.smb_buf_length);
int remaining = rfclen + 4 - server->total_read;
struct cifs_readdata *rdata = mid->callback_data;
while (remaining > 0) {
int length;
length = cifs_read_from_socket(server, server->bigbuf,
min_t(unsigned int, remaining,
CIFSMaxBufSize + MAX_CIFS_HDR_SIZE));
if (length < 0)
return length;
server->total_read += length;
remaining -= length;
}
dequeue_mid(mid, rdata->result);
return 0;
}
static int
cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length, len;
unsigned int data_offset, remaining, data_len;
struct cifs_readdata *rdata = mid->callback_data;
READ_RSP *rsp = (READ_RSP *)server->smallbuf;
unsigned int rfclen = be32_to_cpu(rsp->hdr.smb_buf_length) + 4;
u64 eof;
pgoff_t eof_index;
struct page *page, *tpage;
cFYI(1, "%s: mid=%u offset=%llu bytes=%u", __func__,
mid->mid, rdata->offset, rdata->bytes);
/*
* read the rest of READ_RSP header (sans Data array), or whatever we
* can if there's not enough data. At this point, we've read down to
* the Mid.
*/
len = min_t(unsigned int, rfclen, sizeof(*rsp)) -
sizeof(struct smb_hdr) + 1;
rdata->iov[0].iov_base = server->smallbuf + sizeof(struct smb_hdr) - 1;
rdata->iov[0].iov_len = len;
length = cifs_readv_from_socket(server, rdata->iov, 1, len);
if (length < 0)
return length;
server->total_read += length;
/* Was the SMB read successful? */
rdata->result = map_smb_to_linux_error(&rsp->hdr, false);
if (rdata->result != 0) {
cFYI(1, "%s: server returned error %d", __func__,
rdata->result);
return cifs_readv_discard(server, mid);
}
/* Is there enough to get to the rest of the READ_RSP header? */
if (server->total_read < sizeof(READ_RSP)) {
cFYI(1, "%s: server returned short header. got=%u expected=%zu",
__func__, server->total_read, sizeof(READ_RSP));
rdata->result = -EIO;
return cifs_readv_discard(server, mid);
}
data_offset = le16_to_cpu(rsp->DataOffset) + 4;
if (data_offset < server->total_read) {
/*
* win2k8 sometimes sends an offset of 0 when the read
* is beyond the EOF. Treat it as if the data starts just after
* the header.
*/
cFYI(1, "%s: data offset (%u) inside read response header",
__func__, data_offset);
data_offset = server->total_read;
} else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
/* data_offset is beyond the end of smallbuf */
cFYI(1, "%s: data offset (%u) beyond end of smallbuf",
__func__, data_offset);
rdata->result = -EIO;
return cifs_readv_discard(server, mid);
}
cFYI(1, "%s: total_read=%u data_offset=%u", __func__,
server->total_read, data_offset);
len = data_offset - server->total_read;
if (len > 0) {
/* read any junk before data into the rest of smallbuf */
rdata->iov[0].iov_base = server->smallbuf + server->total_read;
rdata->iov[0].iov_len = len;
length = cifs_readv_from_socket(server, rdata->iov, 1, len);
if (length < 0)
return length;
server->total_read += length;
}
/* set up first iov for signature check */
rdata->iov[0].iov_base = server->smallbuf;
rdata->iov[0].iov_len = server->total_read;
cFYI(1, "0: iov_base=%p iov_len=%zu",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
/* how much data is in the response? */
data_len = le16_to_cpu(rsp->DataLengthHigh) << 16;
data_len += le16_to_cpu(rsp->DataLength);
if (data_offset + data_len > rfclen) {
/* data_len is corrupt -- discard frame */
rdata->result = -EIO;
return cifs_readv_discard(server, mid);
}
/* marshal up the page array */
len = 0;
remaining = data_len;
rdata->nr_iov = 1;
/* determine the eof that the server (probably) has */
eof = CIFS_I(rdata->mapping->host)->server_eof;
eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index);
list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
if (remaining >= PAGE_CACHE_SIZE) {
/* enough data to fill the page */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
++rdata->nr_iov;
len += PAGE_CACHE_SIZE;
remaining -= PAGE_CACHE_SIZE;
} else if (remaining > 0) {
/* enough for partial page, fill and zero the rest */
rdata->iov[rdata->nr_iov].iov_base = kmap(page);
rdata->iov[rdata->nr_iov].iov_len = remaining;
cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
rdata->nr_iov, page->index,
rdata->iov[rdata->nr_iov].iov_base,
rdata->iov[rdata->nr_iov].iov_len);
memset(rdata->iov[rdata->nr_iov].iov_base + remaining,
'\0', PAGE_CACHE_SIZE - remaining);
++rdata->nr_iov;
len += remaining;
remaining = 0;
} else if (page->index > eof_index) {
/*
* The VFS will not try to do readahead past the
* i_size, but it's possible that we have outstanding
* writes with gaps in the middle and the i_size hasn't
* caught up yet. Populate those with zeroed out pages
* to prevent the VFS from repeatedly attempting to
* fill them until the writes are flushed.
*/
zero_user(page, 0, PAGE_CACHE_SIZE);
list_del(&page->lru);
lru_cache_add_file(page);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
} else {
/* no need to hold page hostage */
list_del(&page->lru);
lru_cache_add_file(page);
unlock_page(page);
page_cache_release(page);
}
}
/* issue the read if we have any iovecs left to fill */
if (rdata->nr_iov > 1) {
length = cifs_readv_from_socket(server, &rdata->iov[1],
rdata->nr_iov - 1, len);
if (length < 0)
return length;
server->total_read += length;
} else {
length = 0;
}
rdata->bytes = length;
cFYI(1, "total_read=%u rfclen=%u remaining=%u", server->total_read,
rfclen, remaining);
/* discard anything left over */
if (server->total_read < rfclen)
return cifs_readv_discard(server, mid);
dequeue_mid(mid, false);
return length;
}
static void
cifs_readv_complete(struct work_struct *work)
{
struct cifs_readdata *rdata = container_of(work,
struct cifs_readdata, work);
struct page *page, *tpage;
list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
list_del(&page->lru);
lru_cache_add_file(page);
kunmap(page);
if (rdata->result == 0) {
flush_dcache_page(page);
SetPageUptodate(page);
}
unlock_page(page);
if (rdata->result == 0)
cifs_readpage_to_fscache(rdata->mapping->host, page);
page_cache_release(page);
}
cifs_readdata_free(rdata);
}
static void
cifs_readv_callback(struct mid_q_entry *mid)
{
struct cifs_readdata *rdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
cFYI(1, "%s: mid=%u state=%d result=%d bytes=%u", __func__,
mid->mid, mid->midState, rdata->result, rdata->bytes);
switch (mid->midState) {
case MID_RESPONSE_RECEIVED:
/* result already set, check signature */
if (server->sec_mode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
if (cifs_verify_signature(rdata->iov, rdata->nr_iov,
server, mid->sequence_number + 1))
cERROR(1, "Unexpected SMB signature");
}
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->bytes);
cifs_stats_bytes_read(tcon, rdata->bytes);
break;
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
rdata->result = -EAGAIN;
break;
default:
rdata->result = -EIO;
}
queue_work(system_nrt_wq, &rdata->work);
DeleteMidQEntry(mid);
atomic_dec(&server->inFlight);
wake_up(&server->request_q);
}
/* cifs_async_readv - send an async write, and set up mid to handle result */
int
cifs_async_readv(struct cifs_readdata *rdata)
{
int rc;
READ_REQ *smb = NULL;
int wct;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
cFYI(1, "%s: offset=%llu bytes=%u", __func__,
rdata->offset, rdata->bytes);
if (tcon->ses->capabilities & CAP_LARGE_FILES)
wct = 12;
else {
wct = 10; /* old style read */
if ((rdata->offset >> 32) > 0) {
/* can not handle this big offset for old */
return -EIO;
}
}
rc = small_smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **)&smb);
if (rc)
return rc;
smb->hdr.Pid = cpu_to_le16((__u16)rdata->pid);
smb->hdr.PidHigh = cpu_to_le16((__u16)(rdata->pid >> 16));
smb->AndXCommand = 0xFF; /* none */
smb->Fid = rdata->cfile->netfid;
smb->OffsetLow = cpu_to_le32(rdata->offset & 0xFFFFFFFF);
if (wct == 12)
smb->OffsetHigh = cpu_to_le32(rdata->offset >> 32);
smb->Remaining = 0;
smb->MaxCount = cpu_to_le16(rdata->bytes & 0xFFFF);
smb->MaxCountHigh = cpu_to_le32(rdata->bytes >> 16);
if (wct == 12)
smb->ByteCount = 0;
else {
/* old style read */
struct smb_com_readx_req *smbr =
(struct smb_com_readx_req *)smb;
smbr->ByteCount = 0;
}
/* 4 for RFC1001 length + 1 for BCC */
rdata->iov[0].iov_base = smb;
rdata->iov[0].iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
rc = cifs_call_async(tcon->ses->server, rdata->iov, 1,
cifs_readv_receive, cifs_readv_callback,
rdata, false);
if (rc == 0)
cifs_stats_inc(&tcon->num_reads);
cifs_small_buf_release(smb);
return rc;
}
int
CIFSSMBRead(const int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes,
char **buf, int *pbuf_type)
@ -1834,7 +2194,7 @@ cifs_async_writev(struct cifs_writedata *wdata)
kref_get(&wdata->refcount);
rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1,
cifs_writev_callback, wdata, false);
NULL, cifs_writev_callback, wdata, false);
if (rc == 0)
cifs_stats_inc(&tcon->num_writes);

517
fs/cifs/connect.c
View File

@ -320,27 +320,24 @@ requeue_echo:
}
static bool
allocate_buffers(char **bigbuf, char **smallbuf, unsigned int size,
bool is_large_buf)
allocate_buffers(struct TCP_Server_Info *server)
{
char *bbuf = *bigbuf, *sbuf = *smallbuf;
if (bbuf == NULL) {
bbuf = (char *)cifs_buf_get();
if (!bbuf) {
if (!server->bigbuf) {
server->bigbuf = (char *)cifs_buf_get();
if (!server->bigbuf) {
cERROR(1, "No memory for large SMB response");
msleep(3000);
/* retry will check if exiting */
return false;
}
} else if (is_large_buf) {
} else if (server->large_buf) {
/* we are reusing a dirty large buf, clear its start */
memset(bbuf, 0, size);
memset(server->bigbuf, 0, sizeof(struct smb_hdr));
}
if (sbuf == NULL) {
sbuf = (char *)cifs_small_buf_get();
if (!sbuf) {
if (!server->smallbuf) {
server->smallbuf = (char *)cifs_small_buf_get();
if (!server->smallbuf) {
cERROR(1, "No memory for SMB response");
msleep(1000);
/* retry will check if exiting */
@ -349,12 +346,9 @@ allocate_buffers(char **bigbuf, char **smallbuf, unsigned int size,
/* beginning of smb buffer is cleared in our buf_get */
} else {
/* if existing small buf clear beginning */
memset(sbuf, 0, size);
memset(server->smallbuf, 0, sizeof(struct smb_hdr));
}
*bigbuf = bbuf;
*smallbuf = sbuf;
return true;
}
@ -375,14 +369,72 @@ server_unresponsive(struct TCP_Server_Info *server)
return false;
}
static int
read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read)
/*
* kvec_array_init - clone a kvec array, and advance into it
* @new: pointer to memory for cloned array
* @iov: pointer to original array
* @nr_segs: number of members in original array
* @bytes: number of bytes to advance into the cloned array
*
* This function will copy the array provided in iov to a section of memory
* and advance the specified number of bytes into the new array. It returns
* the number of segments in the new array. "new" must be at least as big as
* the original iov array.
*/
static unsigned int
kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
size_t bytes)
{
size_t base = 0;
while (bytes || !iov->iov_len) {
int copy = min(bytes, iov->iov_len);
bytes -= copy;
base += copy;
if (iov->iov_len == base) {
iov++;
nr_segs--;
base = 0;
}
}
memcpy(new, iov, sizeof(*iov) * nr_segs);
new->iov_base += base;
new->iov_len -= base;
return nr_segs;
}
static struct kvec *
get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
{
struct kvec *new_iov;
if (server->iov && nr_segs <= server->nr_iov)
return server->iov;
/* not big enough -- allocate a new one and release the old */
new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
if (new_iov) {
kfree(server->iov);
server->iov = new_iov;
server->nr_iov = nr_segs;
}
return new_iov;
}
int
cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
unsigned int nr_segs, unsigned int to_read)
{
int length = 0;
int total_read;
unsigned int segs;
struct msghdr smb_msg;
struct kvec iov;
struct kvec *iov;
iov = get_server_iovec(server, nr_segs);
if (!iov)
return -ENOMEM;
smb_msg.msg_control = NULL;
smb_msg.msg_controllen = 0;
@ -393,10 +445,11 @@ read_from_socket(struct TCP_Server_Info *server, char *buf,
break;
}
iov.iov_base = buf + total_read;
iov.iov_len = to_read;
length = kernel_recvmsg(server->ssocket, &smb_msg, &iov, 1,
to_read, 0);
segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
length = kernel_recvmsg(server->ssocket, &smb_msg,
iov, segs, to_read, 0);
if (server->tcpStatus == CifsExiting) {
total_read = -ESHUTDOWN;
break;
@ -426,6 +479,18 @@ read_from_socket(struct TCP_Server_Info *server, char *buf,
return total_read;
}
int
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read)
{
struct kvec iov;
iov.iov_base = buf;
iov.iov_len = to_read;
return cifs_readv_from_socket(server, &iov, 1, to_read);
}
static bool
is_smb_response(struct TCP_Server_Info *server, unsigned char type)
{
@ -471,61 +536,76 @@ is_smb_response(struct TCP_Server_Info *server, unsigned char type)
}
static struct mid_q_entry *
find_cifs_mid(struct TCP_Server_Info *server, struct smb_hdr *buf,
int *length, bool is_large_buf, bool *is_multi_rsp, char **bigbuf)
find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)
{
struct mid_q_entry *mid = NULL, *tmp_mid, *ret = NULL;
struct mid_q_entry *mid;
spin_lock(&GlobalMid_Lock);
list_for_each_entry_safe(mid, tmp_mid, &server->pending_mid_q, qhead) {
if (mid->mid != buf->Mid ||
mid->midState != MID_REQUEST_SUBMITTED ||
mid->command != buf->Command)
continue;
if (*length == 0 && check2ndT2(buf) > 0) {
/* We have a multipart transact2 resp */
*is_multi_rsp = true;
if (mid->resp_buf) {
/* merge response - fix up 1st*/
*length = coalesce_t2(buf, mid->resp_buf);
if (*length > 0) {
*length = 0;
mid->multiRsp = true;
break;
}
/* All parts received or packet is malformed. */
mid->multiEnd = true;
goto multi_t2_fnd;
}
if (!is_large_buf) {
/*FIXME: switch to already allocated largebuf?*/
cERROR(1, "1st trans2 resp needs bigbuf");
} else {
/* Have first buffer */
mid->resp_buf = buf;
mid->largeBuf = true;
*bigbuf = NULL;
}
break;
list_for_each_entry(mid, &server->pending_mid_q, qhead) {
if (mid->mid == buf->Mid &&
mid->midState == MID_REQUEST_SUBMITTED &&
mid->command == buf->Command) {
spin_unlock(&GlobalMid_Lock);
return mid;
}
mid->resp_buf = buf;
mid->largeBuf = is_large_buf;
multi_t2_fnd:
if (*length == 0)
mid->midState = MID_RESPONSE_RECEIVED;
else
mid->midState = MID_RESPONSE_MALFORMED;
#ifdef CONFIG_CIFS_STATS2
mid->when_received = jiffies;
#endif
list_del_init(&mid->qhead);
ret = mid;
break;
}
spin_unlock(&GlobalMid_Lock);
return NULL;
}
return ret;
void
dequeue_mid(struct mid_q_entry *mid, bool malformed)
{
#ifdef CONFIG_CIFS_STATS2
mid->when_received = jiffies;
#endif
spin_lock(&GlobalMid_Lock);
if (!malformed)
mid->midState = MID_RESPONSE_RECEIVED;
else
mid->midState = MID_RESPONSE_MALFORMED;
list_del_init(&mid->qhead);
spin_unlock(&GlobalMid_Lock);
}
static void
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
struct smb_hdr *buf, int malformed)
{
if (malformed == 0 && check2ndT2(buf) > 0) {
mid->multiRsp = true;
if (mid->resp_buf) {
/* merge response - fix up 1st*/
malformed = coalesce_t2(buf, mid->resp_buf);
if (malformed > 0)
return;
/* All parts received or packet is malformed. */
mid->multiEnd = true;
return dequeue_mid(mid, malformed);
}
if (!server->large_buf) {
/*FIXME: switch to already allocated largebuf?*/
cERROR(1, "1st trans2 resp needs bigbuf");
} else {
/* Have first buffer */
mid->resp_buf = buf;
mid->largeBuf = true;
server->bigbuf = NULL;
}
return;
}
mid->resp_buf = buf;
mid->largeBuf = server->large_buf;
/* Was previous buf put in mpx struct for multi-rsp? */
if (!mid->multiRsp) {
/* smb buffer will be freed by user thread */
if (server->large_buf)
server->bigbuf = NULL;
else
server->smallbuf = NULL;
}
dequeue_mid(mid, malformed);
}
static void clean_demultiplex_info(struct TCP_Server_Info *server)
@ -615,6 +695,7 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
}
kfree(server->hostname);
kfree(server->iov);
kfree(server);
length = atomic_dec_return(&tcpSesAllocCount);
@ -623,18 +704,71 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
GFP_KERNEL);
}
static int
standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length;
char *buf = server->smallbuf;
struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
/* make sure this will fit in a large buffer */
if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, "SMB response too long (%u bytes)",
pdu_length);
cifs_reconnect(server);
wake_up(&server->response_q);
return -EAGAIN;
}
/* switch to large buffer if too big for a small one */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
server->large_buf = true;
memcpy(server->bigbuf, server->smallbuf, server->total_read);
buf = server->bigbuf;
smb_buffer = (struct smb_hdr *)buf;
}
/* now read the rest */
length = cifs_read_from_socket(server,
buf + sizeof(struct smb_hdr) - 1,
pdu_length - sizeof(struct smb_hdr) + 1 + 4);
if (length < 0)
return length;
server->total_read += length;
dump_smb(smb_buffer, server->total_read);
/*
* We know that we received enough to get to the MID as we
* checked the pdu_length earlier. Now check to see
* if the rest of the header is OK. We borrow the length
* var for the rest of the loop to avoid a new stack var.
*
* 48 bytes is enough to display the header and a little bit
* into the payload for debugging purposes.
*/
length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
if (length != 0)
cifs_dump_mem("Bad SMB: ", buf,
min_t(unsigned int, server->total_read, 48));
if (mid)
handle_mid(mid, server, smb_buffer, length);
return length;
}
static int
cifs_demultiplex_thread(void *p)
{
int length;
struct TCP_Server_Info *server = p;
unsigned int pdu_length, total_read;
char *buf = NULL, *bigbuf = NULL, *smallbuf = NULL;
unsigned int pdu_length;
char *buf = NULL;
struct smb_hdr *smb_buffer = NULL;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mid_entry;
bool isLargeBuf = false;
bool isMultiRsp = false;
current->flags |= PF_MEMALLOC;
cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
@ -649,20 +783,18 @@ cifs_demultiplex_thread(void *p)
if (try_to_freeze())
continue;
if (!allocate_buffers(&bigbuf, &smallbuf,
sizeof(struct smb_hdr), isLargeBuf))
if (!allocate_buffers(server))
continue;
isLargeBuf = false;
isMultiRsp = false;
smb_buffer = (struct smb_hdr *)smallbuf;
buf = smallbuf;
server->large_buf = false;
smb_buffer = (struct smb_hdr *)server->smallbuf;
buf = server->smallbuf;
pdu_length = 4; /* enough to get RFC1001 header */
length = read_from_socket(server, buf, pdu_length);
length = cifs_read_from_socket(server, buf, pdu_length);
if (length < 0)
continue;
total_read = length;
server->total_read = length;
/*
* The right amount was read from socket - 4 bytes,
@ -674,64 +806,42 @@ cifs_demultiplex_thread(void *p)
if (!is_smb_response(server, buf[0]))
continue;
/* check the length */
if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
(pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
cERROR(1, "Invalid size SMB length %d pdu_length %d",
4, pdu_length + 4);
/* make sure we have enough to get to the MID */
if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) {
cERROR(1, "SMB response too short (%u bytes)",
pdu_length);
cifs_reconnect(server);
wake_up(&server->response_q);
continue;
}
/* else length ok */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
isLargeBuf = true;
memcpy(bigbuf, smallbuf, 4);
smb_buffer = (struct smb_hdr *)bigbuf;
buf = bigbuf;
}
length = read_from_socket(server, buf + 4, pdu_length);
/* read down to the MID */
length = cifs_read_from_socket(server, buf + 4,
sizeof(struct smb_hdr) - 1 - 4);
if (length < 0)
continue;
total_read += length;
server->total_read += length;
dump_smb(smb_buffer, total_read);
mid_entry = find_mid(server, smb_buffer);
/*
* We know that we received enough to get to the MID as we
* checked the pdu_length earlier. Now check to see
* if the rest of the header is OK. We borrow the length
* var for the rest of the loop to avoid a new stack var.
*
* 48 bytes is enough to display the header and a little bit
* into the payload for debugging purposes.
*/
length = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
if (length != 0)
cifs_dump_mem("Bad SMB: ", buf,
min_t(unsigned int, total_read, 48));
if (!mid_entry || !mid_entry->receive)
length = standard_receive3(server, mid_entry);
else
length = mid_entry->receive(server, mid_entry);
if (length < 0)
continue;
if (server->large_buf) {
buf = server->bigbuf;
smb_buffer = (struct smb_hdr *)buf;
}
server->lstrp = jiffies;
mid_entry = find_cifs_mid(server, smb_buffer, &length,
isLargeBuf, &isMultiRsp, &bigbuf);
if (mid_entry != NULL) {
mid_entry->callback(mid_entry);
/* Was previous buf put in mpx struct for multi-rsp? */
if (!isMultiRsp) {
/* smb buffer will be freed by user thread */
if (isLargeBuf)
bigbuf = NULL;
else
smallbuf = NULL;
}
} else if (length != 0) {
/* response sanity checks failed */
continue;
} else if (!is_valid_oplock_break(smb_buffer, server) &&
!isMultiRsp) {
if (!mid_entry->multiRsp || mid_entry->multiEnd)
mid_entry->callback(mid_entry);
} else if (!is_valid_oplock_break(smb_buffer, server)) {
cERROR(1, "No task to wake, unknown frame received! "
"NumMids %d", atomic_read(&midCount));
cifs_dump_mem("Received Data is: ", buf,
@ -745,9 +855,9 @@ cifs_demultiplex_thread(void *p)
} /* end while !EXITING */
/* buffer usually freed in free_mid - need to free it here on exit */
cifs_buf_release(bigbuf);
if (smallbuf) /* no sense logging a debug message if NULL */
cifs_small_buf_release(smallbuf);
cifs_buf_release(server->bigbuf);
if (server->smallbuf) /* no sense logging a debug message if NULL */
cifs_small_buf_release(server->smallbuf);
task_to_wake = xchg(&server->tsk, NULL);
clean_demultiplex_info(server);
@ -2200,16 +2310,16 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
(new->mnt_cifs_flags & CIFS_MOUNT_MASK))
return 0;
if (old->rsize != new->rsize)
return 0;
/*
* We want to share sb only if we don't specify wsize or specified wsize
* is greater or equal than existing one.
* We want to share sb only if we don't specify an r/wsize or
* specified r/wsize is greater than or equal to existing one.
*/
if (new->wsize && new->wsize < old->wsize)
return 0;
if (new->rsize && new->rsize < old->rsize)
return 0;
if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
return 0;
@ -2647,14 +2757,6 @@ void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
CIFS_MOUNT_POSIX_PATHS;
}
if (cifs_sb && (cifs_sb->rsize > 127 * 1024)) {
if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
cifs_sb->rsize = 127 * 1024;
cFYI(DBG2, "larger reads not supported by srv");
}
}
cFYI(1, "Negotiate caps 0x%x", (int)cap);
#ifdef CONFIG_CIFS_DEBUG2
if (cap & CIFS_UNIX_FCNTL_CAP)
@ -2699,27 +2801,11 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
spin_lock_init(&cifs_sb->tlink_tree_lock);
cifs_sb->tlink_tree = RB_ROOT;
if (pvolume_info->rsize > CIFSMaxBufSize) {
cERROR(1, "rsize %d too large, using MaxBufSize",
pvolume_info->rsize);
cifs_sb->rsize = CIFSMaxBufSize;
} else if ((pvolume_info->rsize) &&
(pvolume_info->rsize <= CIFSMaxBufSize))
cifs_sb->rsize = pvolume_info->rsize;
else /* default */
cifs_sb->rsize = CIFSMaxBufSize;
if (cifs_sb->rsize < 2048) {
cifs_sb->rsize = 2048;
/* Windows ME may prefer this */
cFYI(1, "readsize set to minimum: 2048");
}
/*
* Temporarily set wsize for matching superblock. If we end up using
* new sb then cifs_negotiate_wsize will later negotiate it downward
* if needed.
* Temporarily set r/wsize for matching superblock. If we end up using
* new sb then client will later negotiate it downward if needed.
*/
cifs_sb->rsize = pvolume_info->rsize;
cifs_sb->wsize = pvolume_info->wsize;
cifs_sb->mnt_uid = pvolume_info->linux_uid;
@ -2794,29 +2880,41 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
}
/*
* When the server supports very large writes via POSIX extensions, we can
* allow up to 2^24-1, minus the size of a WRITE_AND_X header, not including
* the RFC1001 length.
* When the server supports very large reads and writes via POSIX extensions,
* we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
* including the RFC1001 length.
*
* Note that this might make for "interesting" allocation problems during
* writeback however as we have to allocate an array of pointers for the
* pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
*
* For reads, there is a similar problem as we need to allocate an array
* of kvecs to handle the receive, though that should only need to be done
* once.
*/
#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
/*
* When the server doesn't allow large posix writes, only allow a wsize of
* 2^17-1 minus the size of the WRITE_AND_X header. That allows for a write up
* to the maximum size described by RFC1002.
* When the server doesn't allow large posix writes, only allow a rsize/wsize
* of 2^17-1 minus the size of the call header. That allows for a read or
* write up to the maximum size described by RFC1002.
*/
#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
/*
* The default wsize is 1M. find_get_pages seems to return a maximum of 256
* pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
* a single wsize request with a single call.
*/
#define CIFS_DEFAULT_WSIZE (1024 * 1024)
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
/*
* Windows only supports a max of 60k reads. Default to that when posix
* extensions aren't in force.
*/
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
static unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
@ -2824,7 +2922,7 @@ cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
CIFS_DEFAULT_WSIZE;
CIFS_DEFAULT_IOSIZE;
/* can server support 24-bit write sizes? (via UNIX extensions) */
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
@ -2847,6 +2945,50 @@ cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
return wsize;
}
static unsigned int
cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
{
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
unsigned int rsize, defsize;
/*
* Set default value...
*
* HACK alert! Ancient servers have very small buffers. Even though
* MS-CIFS indicates that servers are only limited by the client's
* bufsize for reads, testing against win98se shows that it throws
* INVALID_PARAMETER errors if you try to request too large a read.
*
* If the server advertises a MaxBufferSize of less than one page,
* assume that it also can't satisfy reads larger than that either.
*
* FIXME: Is there a better heuristic for this?
*/
if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
defsize = CIFS_DEFAULT_IOSIZE;
else if (server->capabilities & CAP_LARGE_READ_X)
defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
else if (server->maxBuf >= PAGE_CACHE_SIZE)
defsize = CIFSMaxBufSize;
else
defsize = server->maxBuf - sizeof(READ_RSP);
rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
/*
* no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
* the client's MaxBufferSize.
*/
if (!(server->capabilities & CAP_LARGE_READ_X))
rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
/* hard limit of CIFS_MAX_RSIZE */
rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
return rsize;
}
static int
is_path_accessible(int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path)
@ -3040,6 +3182,22 @@ cifs_get_volume_info(char *mount_data, const char *devname)
return volume_info;
}
/* make sure ra_pages is a multiple of rsize */
static inline unsigned int
cifs_ra_pages(struct cifs_sb_info *cifs_sb)
{
unsigned int reads;
unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
if (rsize_pages >= default_backing_dev_info.ra_pages)
return default_backing_dev_info.ra_pages;
else if (rsize_pages == 0)
return rsize_pages;
reads = default_backing_dev_info.ra_pages / rsize_pages;
return reads * rsize_pages;
}
int
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
{
@ -3058,8 +3216,6 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
if (rc)
return rc;
cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
#ifdef CONFIG_CIFS_DFS_UPCALL
try_mount_again:
/* cleanup activities if we're chasing a referral */
@ -3124,14 +3280,11 @@ try_mount_again:
CIFSSMBQFSAttributeInfo(xid, tcon);
}
if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
cifs_sb->rsize = 1024 * 127;
cFYI(DBG2, "no very large read support, rsize now 127K");
}
if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
cifs_sb->rsize = min(cifs_sb->rsize, CIFSMaxBufSize);
cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
/* tune readahead according to rsize */
cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb);
remote_path_check:
#ifdef CONFIG_CIFS_DFS_UPCALL

297
fs/cifs/file.c
View File

@ -32,6 +32,7 @@
#include <linux/delay.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
@ -1757,6 +1758,7 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
struct smb_com_read_rsp *pSMBr;
struct cifs_io_parms io_parms;
char *read_data;
unsigned int rsize;
__u32 pid;
if (!nr_segs)
@ -1769,6 +1771,9 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
xid = GetXid();
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
/* FIXME: set up handlers for larger reads and/or convert to async */
rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
open_file = file->private_data;
pTcon = tlink_tcon(open_file->tlink);
@ -1781,7 +1786,7 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
cFYI(1, "attempting read on write only file instance");
for (total_read = 0; total_read < len; total_read += bytes_read) {
cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
cur_len = min_t(const size_t, len - total_read, rsize);
rc = -EAGAIN;
read_data = NULL;
@ -1873,6 +1878,7 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
unsigned int bytes_read = 0;
unsigned int total_read;
unsigned int current_read_size;
unsigned int rsize;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *pTcon;
int xid;
@ -1885,6 +1891,9 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
xid = GetXid();
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
/* FIXME: set up handlers for larger reads and/or convert to async */
rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
if (file->private_data == NULL) {
rc = -EBADF;
FreeXid(xid);
@ -1904,8 +1913,8 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
for (total_read = 0, current_offset = read_data;
read_size > total_read;
total_read += bytes_read, current_offset += bytes_read) {
current_read_size = min_t(uint, read_size - total_read,
cifs_sb->rsize);
current_read_size = min_t(uint, read_size - total_read, rsize);
/* For windows me and 9x we do not want to request more
than it negotiated since it will refuse the read then */
if ((pTcon->ses) &&
@ -2000,82 +2009,24 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
return rc;
}
static void cifs_copy_cache_pages(struct address_space *mapping,
struct list_head *pages, int bytes_read, char *data)
{
struct page *page;
char *target;
while (bytes_read > 0) {
if (list_empty(pages))
break;
page = list_entry(pages->prev, struct page, lru);
list_del(&page->lru);
if (add_to_page_cache_lru(page, mapping, page->index,
GFP_KERNEL)) {
page_cache_release(page);
cFYI(1, "Add page cache failed");
data += PAGE_CACHE_SIZE;
bytes_read -= PAGE_CACHE_SIZE;
continue;
}
page_cache_release(page);
target = kmap_atomic(page, KM_USER0);
if (PAGE_CACHE_SIZE > bytes_read) {
memcpy(target, data, bytes_read);
/* zero the tail end of this partial page */
memset(target + bytes_read, 0,
PAGE_CACHE_SIZE - bytes_read);
bytes_read = 0;
} else {
memcpy(target, data, PAGE_CACHE_SIZE);
bytes_read -= PAGE_CACHE_SIZE;
}
kunmap_atomic(target, KM_USER0);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
data += PAGE_CACHE_SIZE;
/* add page to FS-Cache */
cifs_readpage_to_fscache(mapping->host, page);
}
return;
}
static int cifs_readpages(struct file *file, struct address_space *mapping,
struct list_head *page_list, unsigned num_pages)
{
int rc = -EACCES;
int xid;
loff_t offset;
struct page *page;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *pTcon;
unsigned int bytes_read = 0;
unsigned int read_size, i;
char *smb_read_data = NULL;
struct smb_com_read_rsp *pSMBr;
struct cifsFileInfo *open_file;
struct cifs_io_parms io_parms;
int buf_type = CIFS_NO_BUFFER;
__u32 pid;
int rc;
struct list_head tmplist;
struct cifsFileInfo *open_file = file->private_data;
struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
unsigned int rsize = cifs_sb->rsize;
pid_t pid;
xid = GetXid();
if (file->private_data == NULL) {
rc = -EBADF;
FreeXid(xid);
return rc;
}
open_file = file->private_data;
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
pTcon = tlink_tcon(open_file->tlink);
/*
* Give up immediately if rsize is too small to read an entire page.
* The VFS will fall back to readpage. We should never reach this
* point however since we set ra_pages to 0 when the rsize is smaller
* than a cache page.
*/
if (unlikely(rsize < PAGE_CACHE_SIZE))
return 0;
/*
* Reads as many pages as possible from fscache. Returns -ENOBUFS
@ -2084,125 +2035,127 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
&num_pages);
if (rc == 0)
goto read_complete;
return rc;
cFYI(DBG2, "rpages: num pages %d", num_pages);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
pid = open_file->pid;
else
pid = current->tgid;
for (i = 0; i < num_pages; ) {
unsigned contig_pages;
struct page *tmp_page;
unsigned long expected_index;
rc = 0;
INIT_LIST_HEAD(&tmplist);
if (list_empty(page_list))
break;
cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file,
mapping, num_pages);
/*
* Start with the page at end of list and move it to private
* list. Do the same with any following pages until we hit
* the rsize limit, hit an index discontinuity, or run out of
* pages. Issue the async read and then start the loop again
* until the list is empty.
*
* Note that list order is important. The page_list is in
* the order of declining indexes. When we put the pages in
* the rdata->pages, then we want them in increasing order.
*/
while (!list_empty(page_list)) {
unsigned int bytes = PAGE_CACHE_SIZE;
unsigned int expected_index;
unsigned int nr_pages = 1;
loff_t offset;
struct page *page, *tpage;
struct cifs_readdata *rdata;
page = list_entry(page_list->prev, struct page, lru);
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
/* count adjacent pages that we will read into */
contig_pages = 0;
expected_index =
list_entry(page_list->prev, struct page, lru)->index;
list_for_each_entry_reverse(tmp_page, page_list, lru) {
if (tmp_page->index == expected_index) {
contig_pages++;
expected_index++;
} else
break;
/*
* Lock the page and put it in the cache. Since no one else
* should have access to this page, we're safe to simply set
* PG_locked without checking it first.
*/
__set_page_locked(page);
rc = add_to_page_cache_locked(page, mapping,
page->index, GFP_KERNEL);
/* give up if we can't stick it in the cache */
if (rc) {
__clear_page_locked(page);
break;
}
if (contig_pages + i > num_pages)
contig_pages = num_pages - i;
/* for reads over a certain size could initiate async
read ahead */
/* move first page to the tmplist */
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
list_move_tail(&page->lru, &tmplist);
read_size = contig_pages * PAGE_CACHE_SIZE;
/* Read size needs to be in multiples of one page */
read_size = min_t(const unsigned int, read_size,
cifs_sb->rsize & PAGE_CACHE_MASK);
cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
read_size, contig_pages);
rc = -EAGAIN;
while (rc == -EAGAIN) {
/* now try and add more pages onto the request */
expected_index = page->index + 1;
list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
/* discontinuity ? */
if (page->index != expected_index)
break;
/* would this page push the read over the rsize? */
if (bytes + PAGE_CACHE_SIZE > rsize)
break;
__set_page_locked(page);
if (add_to_page_cache_locked(page, mapping,
page->index, GFP_KERNEL)) {
__clear_page_locked(page);
break;
}
list_move_tail(&page->lru, &tmplist);
bytes += PAGE_CACHE_SIZE;
expected_index++;
nr_pages++;
}
rdata = cifs_readdata_alloc(nr_pages);
if (!rdata) {
/* best to give up if we're out of mem */
list_for_each_entry_safe(page, tpage, &tmplist, lru) {
list_del(&page->lru);
lru_cache_add_file(page);
unlock_page(page);
page_cache_release(page);
}
rc = -ENOMEM;
break;
}
spin_lock(&cifs_file_list_lock);
cifsFileInfo_get(open_file);
spin_unlock(&cifs_file_list_lock);
rdata->cfile = open_file;
rdata->mapping = mapping;
rdata->offset = offset;
rdata->bytes = bytes;
rdata->pid = pid;
list_splice_init(&tmplist, &rdata->pages);
do {
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc != 0)
break;
continue;
}
io_parms.netfid = open_file->netfid;
io_parms.pid = pid;
io_parms.tcon = pTcon;
io_parms.offset = offset;
io_parms.length = read_size;
rc = CIFSSMBRead(xid, &io_parms, &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;
}
rc = cifs_async_readv(rdata);
} while (rc == -EAGAIN);
if (rc != 0) {
list_for_each_entry_safe(page, tpage, &rdata->pages,
lru) {
list_del(&page->lru);
lru_cache_add_file(page);
unlock_page(page);
page_cache_release(page);
}
}
if ((rc < 0) || (smb_read_data == NULL)) {
cFYI(1, "Read error in readpages: %d", rc);
break;
} else if (bytes_read > 0) {
task_io_account_read(bytes_read);
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
cifs_copy_cache_pages(mapping, page_list, bytes_read,
smb_read_data + 4 /* RFC1001 hdr */ +
le16_to_cpu(pSMBr->DataOffset));
i += bytes_read >> PAGE_CACHE_SHIFT;
cifs_stats_bytes_read(pTcon, bytes_read);
if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
i++; /* account for partial page */
/* server copy of file can have smaller size
than client */
/* BB do we need to verify this common case ?
this case is ok - if we are at server EOF
we will hit it on next read */
/* break; */
}
} else {
cFYI(1, "No bytes read (%d) at offset %lld . "
"Cleaning remaining pages from readahead list",
bytes_read, offset);
/* BB turn off caching and do new lookup on
file size at server? */
cifs_readdata_free(rdata);
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;
}
bytes_read = 0;
}
/* need to free smb_read_data buf before exit */
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;
}
read_complete:
FreeXid(xid);
return rc;
}

8
fs/cifs/transport.c
View File

@ -26,6 +26,7 @@
#include <linux/wait.h>
#include <linux/net.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <linux/mempool.h>
@ -324,7 +325,7 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
{
int error;
error = wait_event_killable(server->response_q,
error = wait_event_freezekillable(server->response_q,
midQ->midState != MID_REQUEST_SUBMITTED);
if (error < 0)
return -ERESTARTSYS;
@ -339,8 +340,8 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
*/
int
cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int nvec, mid_callback_t *callback, void *cbdata,
bool ignore_pend)
unsigned int nvec, mid_receive_t *receive,
mid_callback_t *callback, void *cbdata, bool ignore_pend)
{
int rc;
struct mid_q_entry *mid;
@ -374,6 +375,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
goto out_err;
}
mid->receive = receive;
mid->callback = callback;
mid->callback_data = cbdata;
mid->midState = MID_REQUEST_SUBMITTED;

19
include/linux/freezer.h
View File

@ -134,10 +134,25 @@ static inline void set_freezable_with_signal(void)
}
/*
* Freezer-friendly wrappers around wait_event_interruptible() and
* wait_event_interruptible_timeout(), originally defined in <linux/wait.h>
* Freezer-friendly wrappers around wait_event_interruptible(),
* wait_event_killable() and wait_event_interruptible_timeout(), originally
* defined in <linux/wait.h>
*/
#define wait_event_freezekillable(wq, condition) \
({ \
int __retval; \
do { \
__retval = wait_event_killable(wq, \
(condition) || freezing(current)); \
if (__retval && !freezing(current)) \
break; \
else if (!(condition)) \
__retval = -ERESTARTSYS; \
} while (try_to_freeze()); \
__retval; \
})
#define wait_event_freezable(wq, condition) \
({ \
int __retval; \