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freebsd-dev/sys/nfsserver/nfs.h
Jeff Roberson 37374fc852 - Turn all explicit giant acquires into conditional VFS_LOCK_GIANTs. 
Only ops which used namei still remained.
 - Implement a scheme for reducing the overhead of tracking which vops
   require giant by constantly reducing the number of recursive giant
   acquires to one, leaving us with only one vfslocked variable.
 - Remove all NFSD lock acquisition and release from the individual nfs
   ops.  Careful examination has shown that they are not required.  This
   greatly simplifies the code.

Sponsored by:	Isilon Systems, Inc.
Discussed with:	rwatson
Tested by:	kkenn
Approved by:	re
2007-03-17 18:18:08 +00:00

411 lines
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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 _NFSSERVER_NFS_H_
#define _NFSSERVER_NFS_H_
#ifdef _KERNEL
#include "opt_nfs.h"
#endif
/*
* 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_MAXUIDHASH 64 /* Max. # of hashed uid entries/mp */
#ifndef NFS_GATHERDELAY
#define NFS_GATHERDELAY 10 /* Default write gather delay (msec) */
#endif
#ifdef _KERNEL
#define DIRBLKSIZ 512 /* XXX we used to use ufs's DIRBLKSIZ */
#endif
/*
* Oddballs
*/
#define NFS_SRVMAXDATA(n) \
(((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)
/*
* XXX
* The B_INVAFTERWRITE flag should be set to whatever is required by the
* buffer cache code to say "Invalidate the block after it is written back".
*/
#define B_INVAFTERWRITE B_NOCACHE
/*
* The IO_METASYNC flag should be implemented for local filesystems.
* (Until then, it is nothin at all.)
*/
#ifndef IO_METASYNC
#define IO_METASYNC 0
#endif
/* NFS state flags XXX -Wunused */
#define NFSRV_SNDLOCK 0x01000000 /* Send socket lock */
#define NFSRV_WANTSND 0x02000000 /* Want above */
/*
* Structures for the nfssvc(2) syscall. Not that anyone but nfsd and mount_nfs
* should ever try and use it.
*/
struct nfsd_args {
int sock; /* Socket to serve */
caddr_t name; /* Client addr for connection based sockets */
int namelen; /* Length of name */
};
/*
* XXX to allow amd to include nfs.h without nfsproto.h
*/
#ifdef NFS_NPROCS
#include <nfsserver/nfsrvstats.h>
#endif
/*
* Flags for nfssvc() system call.
*/
#define NFSSVC_NFSD 0x004
#define NFSSVC_ADDSOCK 0x008
/*
* vfs.nfsrv sysctl(3) identifiers
*/
#define NFS_NFSRVSTATS 1 /* struct: struct nfsrvstats */
#define NFS_NFSPRIVPORT 2 /* int: prohibit nfs to resvports */
#ifdef _KERNEL
extern struct mtx nfsd_mtx;
#define NFSD_LOCK_ASSERT() mtx_assert(&nfsd_mtx, MA_OWNED)
#define NFSD_UNLOCK_ASSERT() mtx_assert(&nfsd_mtx, MA_NOTOWNED)
#define NFSD_LOCK_DONTCARE()
#define NFSD_LOCK() mtx_lock(&nfsd_mtx)
#define NFSD_UNLOCK() mtx_unlock(&nfsd_mtx)
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_NFSRVDESC);
MALLOC_DECLARE(M_NFSD);
#endif
/* Forward declarations */
struct nfssvc_sock;
struct nfsrv_descript;
struct uio;
struct vattr;
struct nameidata;
extern struct callout nfsrv_callout;
extern struct nfsrvstats nfsrvstats;
extern int nfsrv_ticks;
extern int nfsrvw_procrastinate;
extern int nfsrvw_procrastinate_v3;
extern int nfsrv_numnfsd;
/* Various values converted to XDR form. */
extern u_int32_t nfsrv_nfs_false, nfsrv_nfs_true, nfsrv_nfs_xdrneg1,
nfsrv_nfs_prog;
extern u_int32_t nfsrv_rpc_reply, nfsrv_rpc_msgdenied, nfsrv_rpc_mismatch,
nfsrv_rpc_vers;
extern u_int32_t nfsrv_rpc_auth_unix, nfsrv_rpc_msgaccepted, nfsrv_rpc_call,
nfsrv_rpc_autherr;
/* Procedure table data */
extern const int nfsrvv2_procid[NFS_NPROCS];
extern const int nfsrv_nfsv3_procid[NFS_NPROCS];
extern int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
struct nfssvc_sock *slp, struct thread *td,
struct mbuf **mreqp);
/*
* A list of nfssvc_sock structures is maintained with all the sockets
* that require service by the nfsd.
*/
#ifndef NFS_WDELAYHASHSIZ
#define NFS_WDELAYHASHSIZ 16 /* and with this */
#endif
#define NWDELAYHASH(sock, f) \
(&(sock)->ns_wdelayhashtbl[(*((u_int32_t *)(f))) % NFS_WDELAYHASHSIZ])
/*
* Network address hash list element
*/
union nethostaddr {
u_int32_t had_inetaddr;
struct sockaddr *had_nam;
};
struct nfsrv_rec {
STAILQ_ENTRY(nfsrv_rec) nr_link;
struct sockaddr *nr_address;
struct mbuf *nr_packet;
};
struct nfssvc_sock {
TAILQ_ENTRY(nfssvc_sock) ns_chain; /* List of all nfssvc_sock's */
struct file *ns_fp;
struct socket *ns_so;
struct sockaddr *ns_nam;
struct mbuf *ns_raw;
struct mbuf *ns_rawend;
STAILQ_HEAD(, nfsrv_rec) ns_rec;
struct mbuf *ns_frag;
int ns_flag;
int ns_solock;
int ns_cc;
int ns_reclen;
u_int32_t ns_sref;
LIST_HEAD(, nfsrv_descript) ns_tq; /* Write gather lists */
LIST_HEAD(nfsrvw_delayhash, nfsrv_descript) ns_wdelayhashtbl[NFS_WDELAYHASHSIZ];
};
/* Bits for "ns_flag" */
#define SLP_VALID 0x01 /* Socket valid for use (XXX) */
#define SLP_DOREC 0x02 /* Socket ready for processing */
#define SLP_NEEDQ 0x04 /* Socket has request queued */
#define SLP_DISCONN 0x08 /* Error received from stream socket */
#define SLP_GETSTREAM 0x10 /* nfsrv_getstream in prog on sock */
#define SLP_LASTFRAG 0x20 /* Socket received end-of-record */
#define SLP_ALLFLAGS 0xff
extern TAILQ_HEAD(nfssvc_sockhead, nfssvc_sock) nfssvc_sockhead;
extern int nfssvc_sockhead_flag;
#define SLP_INIT 0x01
#define SLP_WANTINIT 0x02
/*
* One of these structures is allocated for each nfsd.
*/
struct nfsd {
TAILQ_ENTRY(nfsd) nfsd_chain; /* List of all nfsd's */
int nfsd_flag; /* NFSD_ flags */
struct nfssvc_sock *nfsd_slp; /* Current socket */
int nfsd_authlen; /* Authenticator len */
u_char nfsd_authstr[RPCAUTH_MAXSIZ]; /* Authenticator data */
int nfsd_verflen; /* and the Verifier */
u_char nfsd_verfstr[RPCVERF_MAXSIZ];
struct thread *nfsd_td; /* daemon thread ptr */
struct nfsrv_descript *nfsd_nd; /* Associated nfsrv_descript */
};
/* Bits for "nfsd_flag" */
#define NFSD_WAITING 0x01
#define NFSD_REQINPROG 0x02
/*
* This structure is used by the server for describing each request.
* Some fields are used only when write request gathering is performed.
*/
struct nfsrv_descript {
u_quad_t nd_time; /* Write deadline (usec) */
off_t nd_off; /* Start byte offset */
off_t nd_eoff; /* and end byte offset */
LIST_ENTRY(nfsrv_descript) nd_hash; /* Hash list */
LIST_ENTRY(nfsrv_descript) nd_tq; /* and timer list */
LIST_HEAD(, nfsrv_descript) nd_coalesce;/* coalesced writes */
struct mbuf *nd_mrep; /* Request mbuf list */
struct mbuf *nd_md; /* Current dissect mbuf */
struct mbuf *nd_mreq; /* Reply mbuf list */
struct sockaddr *nd_nam; /* and socket addr */
struct sockaddr *nd_nam2; /* return socket addr */
caddr_t nd_dpos; /* Current dissect pos */
u_int32_t nd_procnum; /* RPC # */
int nd_stable; /* storage type */
int nd_flag; /* nd_flag */
int nd_len; /* Length of this write */
int nd_repstat; /* Reply status */
u_int32_t nd_retxid; /* Reply xid */
struct timeval nd_starttime; /* Time RPC initiated */
fhandle_t nd_fh; /* File handle */
struct ucred *nd_cr; /* Credentials */
};
/* Bits for "nd_flag" */
#define ND_NFSV3 0x08
extern TAILQ_HEAD(nfsd_head, nfsd) nfsd_head;
extern int nfsd_head_flag;
#define NFSD_CHECKSLP 0x01
/*
* These macros compare nfsrv_descript structures.
*/
#define NFSW_CONTIG(o, n) \
((o)->nd_eoff >= (n)->nd_off && \
!bcmp((caddr_t)&(o)->nd_fh, (caddr_t)&(n)->nd_fh, NFSX_V3FH))
/*
* 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]))
#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
int nfs_getreq(struct nfsrv_descript *, struct nfsd *, int);
int nfsrv_send(struct socket *, struct sockaddr *, struct mbuf *);
struct mbuf *nfs_rephead(int, struct nfsrv_descript *, int, struct mbuf **,
caddr_t *);
int nfs_slplock(struct nfssvc_sock *, int);
void nfs_slpunlock(struct nfssvc_sock *);
void nfsm_srvfattr(struct nfsrv_descript *, struct vattr *,
struct nfs_fattr *);
void nfsm_srvwcc(struct nfsrv_descript *, int, struct vattr *, int,
struct vattr *, struct mbuf **, char **);
void nfsm_srvpostopattr(struct nfsrv_descript *, int, struct vattr *,
struct mbuf **, char **);
int netaddr_match(int, union nethostaddr *, struct sockaddr *);
int nfs_namei(struct nameidata *, fhandle_t *, int,
struct nfssvc_sock *, struct sockaddr *, struct mbuf **,
caddr_t *, struct vnode **, int, struct vattr *, int *,
struct thread *, int);
void nfsm_adj(struct mbuf *, int, int);
int nfsm_mbuftouio(struct mbuf **, struct uio *, int, caddr_t *);
void nfsrv_initcache(void);
void nfsrv_destroycache(void);
void nfsrv_timer(void *);
int nfsrv_dorec(struct nfssvc_sock *, struct nfsd *,
struct nfsrv_descript **);
int nfsrv_getcache(struct nfsrv_descript *, struct mbuf **);
void nfsrv_updatecache(struct nfsrv_descript *, int, struct mbuf *);
void nfsrv_cleancache(void);
void nfsrv_init(int);
int nfsrv_errmap(struct nfsrv_descript *, int);
void nfsrvw_sort(gid_t *, int);
void nfsrv_setcred(struct ucred *, struct ucred *);
void nfsrv_wakenfsd(struct nfssvc_sock *slp);
int nfsrv_writegather(struct nfsrv_descript **, struct nfssvc_sock *,
struct thread *, struct mbuf **);
int nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_fhtovp(fhandle_t *, int, struct vnode **, int *, struct ucred *,
struct nfssvc_sock *, struct sockaddr *, int *, int);
int nfsrv_setpublicfs(struct mount *, struct netexport *,
struct export_args *);
int nfs_ispublicfh(fhandle_t *);
int nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
int nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct thread *td, struct mbuf **mrq);
void nfsrv_rcv(struct socket *so, void *arg, int waitflag);
void nfsrv_slpderef(struct nfssvc_sock *slp);
#endif /* _KERNEL */
#endif
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