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CIFS: Respect negotiated MaxMpxCount

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Some servers sets this value less than 50 that was hardcoded and
we lost the connection if when we exceed this limit. Fix this by
respecting this value - not sending more than the server allows.

Cc: stable@kernel.org
Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <stevef@smf-gateway.(none)>
This commit is contained in:
Pavel Shilovsky 2012-03-20 12:55:09 +03:00 committed by Steve French
parent ce85852b90
commit 10b9b98e41
7 changed files with 26 additions and 26 deletions
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8
fs/cifs/cifsfs.c
View file

@ -76,7 +76,7 @@ MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
unsigned int cifs_max_pending = CIFS_MAX_REQ;
module_param(cifs_max_pending, int, 0444);
MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
"Default: 50 Range: 2 to 256");
"Default: 32767 Range: 2 to 32767.");
unsigned short echo_retries = 5;
module_param(echo_retries, ushort, 0644);
MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
@ -1116,9 +1116,9 @@ init_cifs(void)
if (cifs_max_pending < 2) {
cifs_max_pending = 2;
cFYI(1, "cifs_max_pending set to min of 2");
} else if (cifs_max_pending > 256) {
cifs_max_pending = 256;
cFYI(1, "cifs_max_pending set to max of 256");
} else if (cifs_max_pending > CIFS_MAX_REQ) {
cifs_max_pending = CIFS_MAX_REQ;
cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
}
rc = cifs_fscache_register();

10
fs/cifs/cifsglob.h
View file

@ -55,14 +55,9 @@
/*
* MAX_REQ is the maximum number of requests that WE will send
* on one socket concurrently. It also matches the most common
* value of max multiplex returned by servers. We may
* eventually want to use the negotiated value (in case
* future servers can handle more) when we are more confident that
* we will not have problems oveloading the socket with pending
* write data.
* on one socket concurrently.
*/
#define CIFS_MAX_REQ 50
#define CIFS_MAX_REQ 32767
#define RFC1001_NAME_LEN 15
#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
@ -263,6 +258,7 @@ struct TCP_Server_Info {
bool session_estab; /* mark when very first sess is established */
u16 dialect; /* dialect index that server chose */
enum securityEnum secType;
bool oplocks:1; /* enable oplocks */
unsigned int maxReq; /* Clients should submit no more */
/* than maxReq distinct unanswered SMBs to the server when using */
/* multiplexed reads or writes */

9
fs/cifs/cifssmb.c
View file

@ -458,7 +458,10 @@ CIFSSMBNegotiate(unsigned int xid, struct cifs_ses *ses)
goto neg_err_exit;
}
server->sec_mode = (__u8)le16_to_cpu(rsp->SecurityMode);
server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
server->maxReq = min_t(unsigned int,
le16_to_cpu(rsp->MaxMpxCount),
cifs_max_pending);
server->oplocks = server->maxReq > 1 ? enable_oplocks : false;
server->maxBuf = le16_to_cpu(rsp->MaxBufSize);
server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);
/* even though we do not use raw we might as well set this
@ -564,7 +567,9 @@ CIFSSMBNegotiate(unsigned int xid, struct cifs_ses *ses)
/* one byte, so no need to convert this or EncryptionKeyLen from
little endian */
server->maxReq = le16_to_cpu(pSMBr->MaxMpxCount);
server->maxReq = min_t(unsigned int, le16_to_cpu(pSMBr->MaxMpxCount),
cifs_max_pending);
server->oplocks = server->maxReq > 1 ? enable_oplocks : false;
/* probably no need to store and check maxvcs */
server->maxBuf = le32_to_cpu(pSMBr->MaxBufferSize);
server->max_rw = le32_to_cpu(pSMBr->MaxRawSize);

11
fs/cifs/connect.c
View file

@ -642,14 +642,10 @@ static void clean_demultiplex_info(struct TCP_Server_Info *server)
spin_unlock(&GlobalMid_Lock);
wake_up_all(&server->response_q);
/*
* Check if we have blocked requests that need to free. Note that
* cifs_max_pending is normally 50, but can be set at module install
* time to as little as two.
*/
/* Check if we have blocked requests that need to free. */
spin_lock(&GlobalMid_Lock);
if (atomic_read(&server->inFlight) >= cifs_max_pending)
atomic_set(&server->inFlight, cifs_max_pending - 1);
if (atomic_read(&server->inFlight) >= server->maxReq)
atomic_set(&server->inFlight, server->maxReq - 1);
/*
* We do not want to set the max_pending too low or we could end up
* with the counter going negative.
@ -1910,6 +1906,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
tcp_ses->noautotune = volume_info->noautotune;
tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
atomic_set(&tcp_ses->inFlight, 0);
tcp_ses->maxReq = 1; /* enough to send negotiate request */
init_waitqueue_head(&tcp_ses->response_q);
init_waitqueue_head(&tcp_ses->request_q);
INIT_LIST_HEAD(&tcp_ses->pending_mid_q);

6
fs/cifs/dir.c
View file

@ -171,7 +171,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
}
tcon = tlink_tcon(tlink);
if (enable_oplocks)
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
if (nd)
@ -492,7 +492,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
{
int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
__u32 oplock = enable_oplocks ? REQ_OPLOCK : 0;
__u32 oplock;
__u16 fileHandle = 0;
bool posix_open = false;
struct cifs_sb_info *cifs_sb;
@ -518,6 +518,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
}
pTcon = tlink_tcon(tlink);
oplock = pTcon->ses->server->oplocks ? REQ_OPLOCK : 0;
/*
* Don't allow the separator character in a path component.
* The VFS will not allow "/", but "\" is allowed by posix.

4
fs/cifs/file.c
View file

@ -380,7 +380,7 @@ int cifs_open(struct inode *inode, struct file *file)
cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
inode, file->f_flags, full_path);
if (enable_oplocks)
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
@ -505,7 +505,7 @@ static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
cFYI(1, "inode = 0x%p file flags 0x%x for %s",
inode, pCifsFile->f_flags, full_path);
if (enable_oplocks)
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;

4
fs/cifs/transport.c
View file

@ -265,12 +265,12 @@ static int wait_for_free_request(struct TCP_Server_Info *server,
spin_lock(&GlobalMid_Lock);
while (1) {
if (atomic_read(&server->inFlight) >= cifs_max_pending) {
if (atomic_read(&server->inFlight) >= server->maxReq) {
spin_unlock(&GlobalMid_Lock);
cifs_num_waiters_inc(server);
wait_event(server->request_q,
atomic_read(&server->inFlight)
< cifs_max_pending);
< server->maxReq);
cifs_num_waiters_dec(server);
spin_lock(&GlobalMid_Lock);
} else {