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cifs: rename and clarify CIFS_ASYNC_OP and CIFS_NO_RESP

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The flags were named confusingly.
CIFS_ASYNC_OP now just means that we will not block waiting for credits
to become available so we thus rename this to be CIFS_NON_BLOCKING.

Change CIFS_NO_RESP to CIFS_NO_RSP_BUF to clarify that we will actually get a
response from the server but we will not get/do not want a response buffer.

Delete CIFSSMBNotify. This is an SMB1 function that is not used.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2019-05-06 10:00:02 +10:00 committed by Steve French
parent d69cb728e7
commit 392e1c5dc9
4 changed files with 14 additions and 107 deletions
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4
fs/cifs/cifsglob.h
View File

@ -1689,11 +1689,11 @@ static inline bool is_retryable_error(int error)
/* Type of Request to SendReceive2 */
#define CIFS_BLOCKING_OP 1 /* operation can block */
#define CIFS_ASYNC_OP 2 /* do not wait for response */
#define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
#define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
#define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
#define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
#define CIFS_NO_RESP 0x040 /* no response buffer required */
#define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
/* Type of request operation */
#define CIFS_ECHO_OP 0x080 /* echo request */

98
fs/cifs/cifssmb.c
View File

@ -860,7 +860,7 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
iov[1].iov_base = (char *)smb + 4;
rc = cifs_call_async(server, &rqst, NULL, cifs_echo_callback, NULL,
server, CIFS_ASYNC_OP | CIFS_ECHO_OP, NULL);
server, CIFS_NON_BLOCKING | CIFS_ECHO_OP, NULL);
if (rc)
cifs_dbg(FYI, "Echo request failed: %d\n", rc);
@ -2508,8 +2508,8 @@ int cifs_lockv(const unsigned int xid, struct cifs_tcon *tcon,
iov[1].iov_len = (num_unlock + num_lock) * sizeof(LOCKING_ANDX_RANGE);
cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP,
&rsp_iov);
rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type,
CIFS_NO_RSP_BUF, &rsp_iov);
cifs_small_buf_release(pSMB);
if (rc)
cifs_dbg(FYI, "Send error in cifs_lockv = %d\n", rc);
@ -2540,7 +2540,7 @@ CIFSSMBLock(const unsigned int xid, struct cifs_tcon *tcon,
if (lockType == LOCKING_ANDX_OPLOCK_RELEASE) {
/* no response expected */
flags = CIFS_NO_SRV_RSP | CIFS_ASYNC_OP | CIFS_OBREAK_OP;
flags = CIFS_NO_SRV_RSP | CIFS_NON_BLOCKING | CIFS_OBREAK_OP;
pSMB->Timeout = 0;
} else if (waitFlag) {
flags = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
@ -6567,93 +6567,3 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
#endif
#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* BB unused temporarily */
/*
* Years ago the kernel added a "dnotify" function for Samba server,
* to allow network clients (such as Windows) to display updated
* lists of files in directory listings automatically when
* files are added by one user when another user has the
* same directory open on their desktop. The Linux cifs kernel
* client hooked into the kernel side of this interface for
* the same reason, but ironically when the VFS moved from
* "dnotify" to "inotify" it became harder to plug in Linux
* network file system clients (the most obvious use case
* for notify interfaces is when multiple users can update
* the contents of the same directory - exactly what network
* file systems can do) although the server (Samba) could
* still use it. For the short term we leave the worker
* function ifdeffed out (below) until inotify is fixed
* in the VFS to make it easier to plug in network file
* system clients. If inotify turns out to be permanently
* incompatible for network fs clients, we could instead simply
* expose this config flag by adding a future cifs (and smb2) notify ioctl.
*/
int CIFSSMBNotify(const unsigned int xid, struct cifs_tcon *tcon,
const int notify_subdirs, const __u16 netfid,
__u32 filter, struct file *pfile, int multishot,
const struct nls_table *nls_codepage)
{
int rc = 0;
struct smb_com_transaction_change_notify_req *pSMB = NULL;
struct smb_com_ntransaction_change_notify_rsp *pSMBr = NULL;
struct dir_notify_req *dnotify_req;
int bytes_returned;
cifs_dbg(FYI, "In CIFSSMBNotify for file handle %d\n", (int)netfid);
rc = smb_init(SMB_COM_NT_TRANSACT, 23, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
pSMB->TotalParameterCount = 0 ;
pSMB->TotalDataCount = 0;
pSMB->MaxParameterCount = cpu_to_le32(2);
pSMB->MaxDataCount = cpu_to_le32(CIFSMaxBufSize & 0xFFFFFF00);
pSMB->MaxSetupCount = 4;
pSMB->Reserved = 0;
pSMB->ParameterOffset = 0;
pSMB->DataCount = 0;
pSMB->DataOffset = 0;
pSMB->SetupCount = 4; /* single byte does not need le conversion */
pSMB->SubCommand = cpu_to_le16(NT_TRANSACT_NOTIFY_CHANGE);
pSMB->ParameterCount = pSMB->TotalParameterCount;
if (notify_subdirs)
pSMB->WatchTree = 1; /* one byte - no le conversion needed */
pSMB->Reserved2 = 0;
pSMB->CompletionFilter = cpu_to_le32(filter);
pSMB->Fid = netfid; /* file handle always le */
pSMB->ByteCount = 0;
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *)pSMBr, &bytes_returned,
CIFS_ASYNC_OP);
if (rc) {
cifs_dbg(FYI, "Error in Notify = %d\n", rc);
} else {
/* Add file to outstanding requests */
/* BB change to kmem cache alloc */
dnotify_req = kmalloc(
sizeof(struct dir_notify_req),
GFP_KERNEL);
if (dnotify_req) {
dnotify_req->Pid = pSMB->hdr.Pid;
dnotify_req->PidHigh = pSMB->hdr.PidHigh;
dnotify_req->Mid = pSMB->hdr.Mid;
dnotify_req->Tid = pSMB->hdr.Tid;
dnotify_req->Uid = pSMB->hdr.Uid;
dnotify_req->netfid = netfid;
dnotify_req->pfile = pfile;
dnotify_req->filter = filter;
dnotify_req->multishot = multishot;
spin_lock(&GlobalMid_Lock);
list_add_tail(&dnotify_req->lhead,
&GlobalDnotifyReqList);
spin_unlock(&GlobalMid_Lock);
} else
rc = -ENOMEM;
}
cifs_buf_release(pSMB);
return rc;
}
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */

10
fs/cifs/smb2pdu.c
View File

@ -1538,7 +1538,7 @@ SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
else if (server->sign)
req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
flags |= CIFS_NO_RESP;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
@ -1739,7 +1739,7 @@ SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
flags |= CIFS_NO_RESP;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
@ -4166,7 +4166,7 @@ SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
req->OplockLevel = oplock_level;
req->sync_hdr.CreditRequest = cpu_to_le16(1);
flags |= CIFS_NO_RESP;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;
@ -4440,7 +4440,7 @@ smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
struct kvec rsp_iov;
int resp_buf_type;
unsigned int count;
int flags = CIFS_NO_RESP;
int flags = CIFS_NO_RSP_BUF;
unsigned int total_len;
cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
@ -4533,7 +4533,7 @@ SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
memcpy(req->LeaseKey, lease_key, 16);
req->LeaseState = lease_state;
flags |= CIFS_NO_RESP;
flags |= CIFS_NO_RSP_BUF;
iov[0].iov_base = (char *)req;
iov[0].iov_len = total_len;

9
fs/cifs/transport.c
View File

@ -529,7 +529,7 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
return -EAGAIN;
spin_lock(&server->req_lock);
if ((flags & CIFS_TIMEOUT_MASK) == CIFS_ASYNC_OP) {
if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) {
/* oplock breaks must not be held up */
server->in_flight++;
*credits -= 1;
@ -838,7 +838,7 @@ SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
iov[0].iov_base = in_buf;
iov[0].iov_len = get_rfc1002_length(in_buf) + 4;
flags |= CIFS_NO_RESP;
flags |= CIFS_NO_RSP_BUF;
rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc);
@ -1151,7 +1151,7 @@ compound_send_recv(const unsigned int xid, struct cifs_ses *ses,
flags & CIFS_LOG_ERROR);
/* mark it so buf will not be freed by cifs_delete_mid */
if ((flags & CIFS_NO_RESP) == 0)
if ((flags & CIFS_NO_RSP_BUF) == 0)
midQ[i]->resp_buf = NULL;
}
@ -1302,9 +1302,6 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
if (rc < 0)
goto out;
if ((flags & CIFS_TIMEOUT_MASK) == CIFS_ASYNC_OP)
goto out;
rc = wait_for_response(ses->server, midQ);
if (rc != 0) {
send_cancel(ses->server, &rqst, midQ);