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freebsd-dev/sys/nfsclient/nfs.h
Konstantin Belousov 57bfe0a9f8 Do not fork nfsiod directly from the vop methods. This causes LORs between 
vnode lock and several locks needed during fork, like fd lock.

Instead, schedule the task to be executed in the taskqueue context. We
still waiting for the fork to finish, but the context of the thread
executing the task does not make real LORs with our vnode lock.

Submitted by:	pluknet at gmail com
Reviewed by:	jhb
Tested by:	pho
MFC after:	3 weeks
2010-09-12 19:06:08 +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 UDP soft mounts */
#define NFS_RETRANS_TCP 2 /* Num of retrans for TCP 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 3 /* VDIR attrib cache timeout in sec */
#endif
#ifndef NFS_MAXDIRATTRTIMO
#define NFS_MAXDIRATTRTIMO 60
#endif
#ifndef NFS_ACCESSCACHESIZE
#define NFS_ACCESSCACHESIZE 8 /* Per-node access cache entries */
#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 NFS_ISV4(v) (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV4)
#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 */
#define NFSSTA_LOCKTIMEO 0x20000000 /* Experiencing a lockd 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 */
#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 nfsstats nfsstats;
extern struct mtx nfs_iod_mtx;
extern struct task nfs_nfsiodnew_task;
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];
/*
* 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)
struct nfsmount;
struct buf;
struct socket;
struct uio;
struct vattr;
/*
* 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
/*
* On fast networks, the estimator will try to reduce the
* timeout lower than the latency of the server's disks,
* which results in too many timeouts, so cap the lower
* bound.
*/
#define NFS_MINRTO (NFS_HZ >> 2)
/*
* Keep the RTO from increasing to unreasonably large values
* when a server is not responding.
*/
#define NFS_MAXRTO (20 * NFS_HZ)
enum nfs_rto_timer_t {
NFS_DEFAULT_TIMER,
NFS_GETATTR_TIMER,
NFS_LOOKUP_TIMER,
NFS_READ_TIMER,
NFS_WRITE_TIMER,
};
#define NFS_MAX_TIMER (NFS_WRITE_TIMER)
#define NFS_INITRTT (NFS_HZ << 3)
vfs_init_t nfs_init;
vfs_uninit_t nfs_uninit;
int nfs_mountroot(struct mount *mp);
void nfs_purgecache(struct vnode *);
int nfs_vinvalbuf(struct vnode *, int, 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(int);
void nfs_nfsiodnew_tq(__unused void *, int);
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 *);
int nfs_readlinkrpc(struct vnode *, struct uio *, struct ucred *);
int nfs_sigintr(struct nfsmount *, 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 *);
void nfs_disconnect(struct nfsmount *);
void nfs_safedisconnect(struct nfsmount *);
int nfs_getattrcache(struct vnode *, struct vattr *);
int nfs_iosize(struct nfsmount *nmp);
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(struct thread *td, sigset_t *oldset);
void nfs_restore_sigmask(struct thread *td, sigset_t *set);
int nfs_msleep(struct thread *td, void *ident, struct mtx *mtx,
int priority, char *wmesg, int timo);
#endif /* _KERNEL */
#endif
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