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Commit c3dccf48 authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: TCP_Server_Info diet 



Remove fields that are completely unused, and rearrange struct
according to recommendations by "pahole".

Before:

	/* size: 1112, cachelines: 18, members: 49 */
	/* sum members: 1086, holes: 8, sum holes: 26 */
	/* bit holes: 1, sum bit holes: 7 bits */
	/* last cacheline: 24 bytes */

After:

	/* size: 1072, cachelines: 17, members: 42 */
	/* sum members: 1065, holes: 3, sum holes: 7 */
	/* last cacheline: 48 bytes */

...savings of 40 bytes per struct on x86_64. 21 bytes by field removal,
and 19 by reorganizing to eliminate holes.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent a70307ee

fs/cifs/cifsglob.h

+9 −17
Original line number Diff line number Diff line
@@ -161,6 +161,7 @@ struct TCP_Server_Info { 
	int srv_count; /* reference counter */

	/* 15 character server name + 0x20 16th byte indicating type = srv */

	char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];

	enum statusEnum tcpStatus; /* what we think the status is */

	char *hostname; /* hostname portion of UNC string */

	struct socket *ssocket;

	struct sockaddr_storage dstaddr;
@@ -168,25 +169,16 @@ struct TCP_Server_Info { 
	wait_queue_head_t response_q;

	wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/

	struct list_head pending_mid_q;

	void *Server_NlsInfo;	/* BB - placeholder for future NLS info  */

	unsigned short server_codepage;	/* codepage for the server    */

	enum protocolEnum protocolType;

	char versionMajor;

	char versionMinor;

	bool svlocal:1;			/* local server or remote */

	bool noblocksnd;		/* use blocking sendmsg */

	bool noautotune;		/* do not autotune send buf sizes */

	bool tcp_nodelay;

	atomic_t inFlight;  /* number of requests on the wire to server */

#ifdef CONFIG_CIFS_STATS2

	atomic_t inSend; /* requests trying to send */

	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */

#endif

	enum statusEnum tcpStatus; /* what we think the status is */

	struct mutex srv_mutex;

	struct task_struct *tsk;

	char server_GUID[16];

	char secMode;

	bool session_estab; /* mark when very first sess is established */

	u16 dialect; /* dialect index that server chose */

	enum securityEnum secType;

	unsigned int maxReq;	/* Clients should submit no more */

	/* than maxReq distinct unanswered SMBs to the server when using  */
@@ -199,8 +191,6 @@ struct TCP_Server_Info { 
	unsigned int max_vcs;	/* maximum number of smb sessions, at least

				   those that can be specified uniquely with

				   vcnumbers */

	char sessid[4];		/* unique token id for this session */

	/* (returned on Negotiate */

	int capabilities; /* allow selective disabling of caps by smb sess */

	int timeAdj;  /* Adjust for difference in server time zone in sec */

	__u16 CurrentMid;         /* multiplex id - rotating counter */
@@ -210,18 +200,20 @@ struct TCP_Server_Info { 
	__u32 sequence_number; /* for signing, protected by srv_mutex */

	struct session_key session_key;

	unsigned long lstrp; /* when we got last response from this server */

	u16 dialect; /* dialect index that server chose */

	struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */

	/* extended security flavors that server supports */

	bool	sec_ntlmssp;		/* supports NTLMSSP */

	bool	sec_kerberosu2u;	/* supports U2U Kerberos */

	bool	sec_kerberos;		/* supports plain Kerberos */

	bool	sec_mskerberos;		/* supports legacy MS Kerberos */

	bool	sec_kerberosu2u;	/* supports U2U Kerberos */

	bool	sec_ntlmssp;		/* supports NTLMSSP */

	bool session_estab; /* mark when very first sess is established */

	struct delayed_work	echo; /* echo ping workqueue job */

#ifdef CONFIG_CIFS_FSCACHE

	struct fscache_cookie   *fscache; /* client index cache cookie */

#endif

#ifdef CONFIG_CIFS_STATS2

	atomic_t inSend; /* requests trying to send */

	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */

#endif

};



/*

fs/cifs/cifssmb.c

+0 −2
Original line number Diff line number Diff line
@@ -452,7 +452,6 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) 
		server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),

				(__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);

		server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);

		GETU32(server->sessid) = le32_to_cpu(rsp->SessionKey);

		/* even though we do not use raw we might as well set this

		accurately, in case we ever find a need for it */

		if ((le16_to_cpu(rsp->RawMode) & RAW_ENABLE) == RAW_ENABLE) {
@@ -566,7 +565,6 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) 
			(__u32) CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);

	server->max_rw = le32_to_cpu(pSMBr->MaxRawSize);

	cFYI(DBG2, "Max buf = %d", ses->server->maxBuf);

	GETU32(ses->server->sessid) = le32_to_cpu(pSMBr->SessionKey);

	server->capabilities = le32_to_cpu(pSMBr->Capabilities);

	server->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone);

	server->timeAdj *= 60;