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freebsd-dev/sys/nfsclient/nfs.h
Paul Saab a7500bceb0 First cut of NFS direct IO support. 
- NFS direct IO completely bypasses the buffer and page caches.
  If a file is open for direct IO all caching is disabled.
- Direct IO for Directories will be addressed later.
- 2 new NFS directio related sysctls are added. One is a knob to
  disable NFS direct IO completely (direct IO is enabled by default).
  The other is to disallow mmaped IO on a file that has at least one
  O_DIRECT open (see the comment in nfs_vnops.c for more details).
  The default is to allow mmaps on a file that has O_DIRECT opens.

Submitted by:	Mohan Srinivasan mohans at yahoo-inc dot com
Obtained from:	Yahoo!
2004-12-15 22:20:22 +00:00

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/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs.h 8.4 (Berkeley) 5/1/95
* $FreeBSD$
*/
#ifndef _NFSCLIENT_NFS_H_
#define _NFSCLIENT_NFS_H_
#ifdef _KERNEL
#include "opt_nfs.h"
#endif
#include <nfsclient/nfsargs.h>
/*
* Tunable constants for nfs
*/
#define NFS_TICKINTVL 10 /* Desired time for a tick (msec) */
#define NFS_HZ (hz / nfs_ticks) /* Ticks/sec */
#define NFS_TIMEO (1 * NFS_HZ) /* Default timeout = 1 second */
#define NFS_MINTIMEO (1 * NFS_HZ) /* Min timeout to use */
#define NFS_MAXTIMEO (60 * NFS_HZ) /* Max timeout to backoff to */
#define NFS_MINIDEMTIMEO (5 * NFS_HZ) /* Min timeout for non-idempotent ops*/
#define NFS_MAXREXMIT 100 /* Stop counting after this many */
#define NFS_RETRANS 10 /* Num of retrans for soft mounts */
#define NFS_MAXGRPS 16 /* Max. size of groups list */
#ifndef NFS_MINATTRTIMO
#define NFS_MINATTRTIMO 3 /* VREG attrib cache timeout in sec */
#endif
#ifndef NFS_MAXATTRTIMO
#define NFS_MAXATTRTIMO 60
#endif
#ifndef NFS_MINDIRATTRTIMO
#define NFS_MINDIRATTRTIMO 30 /* VDIR attrib cache timeout in sec */
#endif
#ifndef NFS_MAXDIRATTRTIMO
#define NFS_MAXDIRATTRTIMO 60
#endif
#define NFS_WSIZE 8192 /* Def. write data size <= 8192 */
#define NFS_RSIZE 8192 /* Def. read data size <= 8192 */
#define NFS_READDIRSIZE 8192 /* Def. readdir size */
#define NFS_DEFRAHEAD 1 /* Def. read ahead # blocks */
#define NFS_MAXRAHEAD 4 /* Max. read ahead # blocks */
#define NFS_MAXASYNCDAEMON 64 /* Max. number async_daemons runnable */
#define NFS_DIRBLKSIZ 4096 /* Must be a multiple of DIRBLKSIZ */
#ifdef _KERNEL
#define DIRBLKSIZ 512 /* XXX we used to use ufs's DIRBLKSIZ */
#endif
#define NFS_MAXDEADTHRESH 9 /* How long till we say 'server not responding' */
/*
* Oddballs
*/
#define NFS_CMPFH(n, f, s) \
((n)->n_fhsize == (s) && !bcmp((caddr_t)(n)->n_fhp, (caddr_t)(f), (s)))
#define NFS_ISV3(v) (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
#define NFSSTA_HASWRITEVERF 0x00040000 /* Has write verifier for V3 */
#define NFSSTA_GOTFSINFO 0x00100000 /* Got the V3 fsinfo */
#define NFSSTA_SNDLOCK 0x01000000 /* Send socket lock */
#define NFSSTA_WANTSND 0x02000000 /* Want above */
#define NFSSTA_TIMEO 0x10000000 /* Experiencing a timeout */
/*
* XXX to allow amd to include nfs.h without nfsproto.h
*/
#ifdef NFS_NPROCS
#include <nfsclient/nfsstats.h>
#endif
/*
* vfs.nfs sysctl(3) identifiers
*/
#define NFS_NFSSTATS 1 /* struct: struct nfsstats */
/*
* File context information for nfsv4. Currently, there is only one
* lockowner for the whole machine "0."
*/
struct nfs4_fctx {
TAILQ_ENTRY(nfs4_fstate) next;
uint32_t refcnt;
struct nfs4_lowner *lop;
struct nfsnode *np;
char stateid[NFSX_V4STATEID];
};
#ifdef _KERNEL
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_NFSREQ);
MALLOC_DECLARE(M_NFSDIROFF);
MALLOC_DECLARE(M_NFSBIGFH);
MALLOC_DECLARE(M_NFSHASH);
MALLOC_DECLARE(M_NFSDIRECTIO);
#endif
extern struct uma_zone *nfsmount_zone;
extern struct callout nfs_callout;
extern struct nfsstats nfsstats;
extern int nfs_numasync;
extern unsigned int nfs_iodmax;
extern int nfs_pbuf_freecnt;
extern int nfs_ticks;
/* Data constants in XDR form */
extern u_int32_t nfs_true, nfs_false, nfs_xdrneg1;
extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers;
extern u_int32_t rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr;
extern int nfsv3_procid[NFS_NPROCS];
struct uio;
struct buf;
struct vattr;
struct nameidata;
/*
* Socket errors ignored for connectionless sockets??
* For now, ignore them all
*/
#define NFSIGNORE_SOERROR(s, e) \
((e) != EINTR && (e) != EIO && \
(e) != ERESTART && (e) != EWOULDBLOCK && \
((s) & PR_CONNREQUIRED) == 0)
/*
* Nfs outstanding request list element
*/
struct nfsreq {
TAILQ_ENTRY(nfsreq) r_chain;
struct mbuf *r_mreq;
struct mbuf *r_mrep;
struct mbuf *r_md;
caddr_t r_dpos;
struct nfsmount *r_nmp;
struct vnode *r_vp;
u_int32_t r_xid;
int r_flags; /* flags on request, see below */
int r_retry; /* max retransmission count */
int r_rexmit; /* current retrans count */
int r_timer; /* tick counter on reply */
u_int32_t r_procnum; /* NFS procedure number */
int r_rtt; /* RTT for rpc */
int r_lastmsg; /* last tprintf */
struct thread *r_td; /* Proc that did I/O system call */
};
/*
* Queue head for nfsreq's
*/
extern TAILQ_HEAD(nfs_reqq, nfsreq) nfs_reqq;
/* Flag values for r_flags */
#define R_TIMING 0x01 /* timing request (in mntp) */
#define R_SENT 0x02 /* request has been sent */
#define R_SOFTTERM 0x04 /* soft mnt, too many retries */
#define R_RESENDERR 0x08 /* Resend failed */
#define R_SOCKERR 0x10 /* Fatal error on socket */
#define R_TPRINTFMSG 0x20 /* Did a tprintf msg. */
#define R_MUSTRESEND 0x40 /* Must resend request */
#define R_GETONEREP 0x80 /* Probe for one reply only */
/*
* Pointers to ops that differ from v3 to v4
*/
struct nfs_rpcops {
int (*nr_readrpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred);
int (*nr_writerpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred,
int *iomode, int *must_commit);
int (*nr_writebp)(struct buf *bp, int force, struct thread *td);
int (*nr_readlinkrpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred);
void (*nr_invaldir)(struct vnode *vp);
int (*nr_commit)(struct vnode *vp, u_quad_t offset, int cnt,
struct ucred *cred, struct thread *td);
};
/*
* Defines for WebNFS
*/
#define WEBNFS_ESC_CHAR '%'
#define WEBNFS_SPECCHAR_START 0x80
#define WEBNFS_NATIVE_CHAR 0x80
/*
* ..
* Possibly more here in the future.
*/
/*
* Macro for converting escape characters in WebNFS pathnames.
* Should really be in libkern.
*/
#define HEXTOC(c) \
((c) >= 'a' ? ((c) - ('a' - 10)) : \
((c) >= 'A' ? ((c) - ('A' - 10)) : ((c) - '0')))
#define HEXSTRTOI(p) \
((HEXTOC(p[0]) << 4) + HEXTOC(p[1]))
/* nfs_sigintr() helper, when 'rep' has all we need */
#define NFS_SIGREP(rep) nfs_sigintr((rep)->r_nmp, (rep), (rep)->r_td)
#ifdef NFS_DEBUG
extern int nfs_debug;
#define NFS_DEBUG_ASYNCIO 1 /* asynchronous i/o */
#define NFS_DEBUG_WG 2 /* server write gathering */
#define NFS_DEBUG_RC 4 /* server request caching */
#define NFS_DPF(cat, args) \
do { \
if (nfs_debug & NFS_DEBUG_##cat) printf args; \
} while (0)
#else
#define NFS_DPF(cat, args)
#endif
vfs_init_t nfs_init;
vfs_uninit_t nfs_uninit;
int nfs_mountroot(struct mount *mp, struct thread *td);
#ifndef NFS4_USE_RPCCLNT
int nfs_send(struct socket *, struct sockaddr *, struct mbuf *,
struct nfsreq *);
int nfs_sndlock(struct nfsreq *);
void nfs_sndunlock(struct nfsreq *);
#endif /* ! NFS4_USE_RPCCLNT */
int nfs_vinvalbuf(struct vnode *, int, struct ucred *, struct thread *,
int);
int nfs_readrpc(struct vnode *, struct uio *, struct ucred *);
int nfs_writerpc(struct vnode *, struct uio *, struct ucred *, int *,
int *);
int nfs_commit(struct vnode *vp, u_quad_t offset, int cnt,
struct ucred *cred, struct thread *td);
int nfs_readdirrpc(struct vnode *, struct uio *, struct ucred *);
int nfs_nfsiodnew(void);
int nfs_asyncio(struct nfsmount *, struct buf *, struct ucred *, struct thread *);
int nfs_doio(struct vnode *, struct buf *, struct ucred *, struct thread *);
void nfs_doio_directwrite (struct buf *);
void nfs_up(struct nfsreq *, struct nfsmount *, struct thread *,
const char *, int);
void nfs_down(struct nfsreq *, struct nfsmount *, struct thread *,
const char *, int, int);
int nfs_readlinkrpc(struct vnode *, struct uio *, struct ucred *);
int nfs_sigintr(struct nfsmount *, struct nfsreq *, struct thread *);
int nfs_readdirplusrpc(struct vnode *, struct uio *, struct ucred *);
int nfs_request(struct vnode *, struct mbuf *, int, struct thread *,
struct ucred *, struct mbuf **, struct mbuf **, caddr_t *);
int nfs_loadattrcache(struct vnode **, struct mbuf **, caddr_t *,
struct vattr *, int);
int nfsm_mbuftouio(struct mbuf **, struct uio *, int, caddr_t *);
void nfs_nhinit(void);
void nfs_nhuninit(void);
int nfs_nmcancelreqs(struct nfsmount *);
void nfs_timer(void*);
int nfs_connect(struct nfsmount *, struct nfsreq *);
void nfs_disconnect(struct nfsmount *);
void nfs_safedisconnect(struct nfsmount *);
int nfs_getattrcache(struct vnode *, struct vattr *);
int nfsm_strtmbuf(struct mbuf **, char **, const char *, long);
int nfs_bioread(struct vnode *, struct uio *, int, struct ucred *);
int nfsm_uiotombuf(struct uio *, struct mbuf **, int, caddr_t *);
void nfs_clearcommit(struct mount *);
int nfs_writebp(struct buf *, int, struct thread *);
int nfs_fsinfo(struct nfsmount *, struct vnode *, struct ucred *,
struct thread *);
int nfs_meta_setsize (struct vnode *, struct ucred *,
struct thread *, u_quad_t);
void nfs_set_sigmask __P((struct thread *td, sigset_t *oldset));
void nfs_restore_sigmask __P((struct thread *td, sigset_t *set));
int nfs_tsleep __P((struct thread *td, void *ident, int priority, char *wmesg,
int timo));
int nfs_msleep __P((struct thread *td, void *ident, struct mtx *mtx, int priority,
char *wmesg, int timo));
#endif /* _KERNEL */
#endif
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