nfs_vnops.c

早期freebsd实现

/*
 * Copyright (c) 1989, 1993
 *	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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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_vnops.c	8.5 (Berkeley) 2/13/94
 */

/*
 * vnode op calls for sun nfs version 2
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/conf.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/map.h>
#include <sys/dirent.h>

#include <vm/vm.h>

#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>

#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nqnfs.h>

/* Defs */
#define	TRUE	1
#define	FALSE	0

/*
 * Global vfs data structures for nfs
 */
int (**nfsv2_vnodeop_p)();
struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, nfs_lookup },	/* lookup */
	{ &vop_create_desc, nfs_create },	/* create */
	{ &vop_mknod_desc, nfs_mknod },		/* mknod */
	{ &vop_open_desc, nfs_open },		/* open */
	{ &vop_close_desc, nfs_close },		/* close */
	{ &vop_access_desc, nfs_access },	/* access */
	{ &vop_getattr_desc, nfs_getattr },	/* getattr */
	{ &vop_setattr_desc, nfs_setattr },	/* setattr */
	{ &vop_read_desc, nfs_read },		/* read */
	{ &vop_write_desc, nfs_write },		/* write */
	{ &vop_ioctl_desc, nfs_ioctl },		/* ioctl */
	{ &vop_select_desc, nfs_select },	/* select */
	{ &vop_mmap_desc, nfs_mmap },		/* mmap */
	{ &vop_fsync_desc, nfs_fsync },		/* fsync */
	{ &vop_seek_desc, nfs_seek },		/* seek */
	{ &vop_remove_desc, nfs_remove },	/* remove */
	{ &vop_link_desc, nfs_link },		/* link */
	{ &vop_rename_desc, nfs_rename },	/* rename */
	{ &vop_mkdir_desc, nfs_mkdir },		/* mkdir */
	{ &vop_rmdir_desc, nfs_rmdir },		/* rmdir */
	{ &vop_symlink_desc, nfs_symlink },	/* symlink */
	{ &vop_readdir_desc, nfs_readdir },	/* readdir */
	{ &vop_readlink_desc, nfs_readlink },	/* readlink */
	{ &vop_abortop_desc, nfs_abortop },	/* abortop */
	{ &vop_inactive_desc, nfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, nfs_reclaim },	/* reclaim */
	{ &vop_lock_desc, nfs_lock },		/* lock */
	{ &vop_unlock_desc, nfs_unlock },	/* unlock */
	{ &vop_bmap_desc, nfs_bmap },		/* bmap */
	{ &vop_strategy_desc, nfs_strategy },	/* strategy */
	{ &vop_print_desc, nfs_print },		/* print */
	{ &vop_islocked_desc, nfs_islocked },	/* islocked */
	{ &vop_pathconf_desc, nfs_pathconf },	/* pathconf */
	{ &vop_advlock_desc, nfs_advlock },	/* advlock */
	{ &vop_blkatoff_desc, nfs_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, nfs_valloc },	/* valloc */
	{ &vop_reallocblks_desc, nfs_reallocblks },	/* reallocblks */
	{ &vop_vfree_desc, nfs_vfree },		/* vfree */
	{ &vop_truncate_desc, nfs_truncate },	/* truncate */
	{ &vop_update_desc, nfs_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
	{ &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };

/*
 * Special device vnode ops
 */
int (**spec_nfsv2nodeop_p)();
struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, spec_lookup },	/* lookup */
	{ &vop_create_desc, spec_create },	/* create */
	{ &vop_mknod_desc, spec_mknod },	/* mknod */
	{ &vop_open_desc, spec_open },		/* open */
	{ &vop_close_desc, nfsspec_close },	/* close */
	{ &vop_access_desc, nfsspec_access },	/* access */
	{ &vop_getattr_desc, nfs_getattr },	/* getattr */
	{ &vop_setattr_desc, nfs_setattr },	/* setattr */
	{ &vop_read_desc, nfsspec_read },	/* read */
	{ &vop_write_desc, nfsspec_write },	/* write */
	{ &vop_ioctl_desc, spec_ioctl },	/* ioctl */
	{ &vop_select_desc, spec_select },	/* select */
	{ &vop_mmap_desc, spec_mmap },		/* mmap */
	{ &vop_fsync_desc, nfs_fsync },		/* fsync */
	{ &vop_seek_desc, spec_seek },		/* seek */
	{ &vop_remove_desc, spec_remove },	/* remove */
	{ &vop_link_desc, spec_link },		/* link */
	{ &vop_rename_desc, spec_rename },	/* rename */
	{ &vop_mkdir_desc, spec_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, spec_rmdir },	/* rmdir */
	{ &vop_symlink_desc, spec_symlink },	/* symlink */
	{ &vop_readdir_desc, spec_readdir },	/* readdir */
	{ &vop_readlink_desc, spec_readlink },	/* readlink */
	{ &vop_abortop_desc, spec_abortop },	/* abortop */
	{ &vop_inactive_desc, nfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, nfs_reclaim },	/* reclaim */
	{ &vop_lock_desc, nfs_lock },		/* lock */
	{ &vop_unlock_desc, nfs_unlock },	/* unlock */
	{ &vop_bmap_desc, spec_bmap },		/* bmap */
	{ &vop_strategy_desc, spec_strategy },	/* strategy */
	{ &vop_print_desc, nfs_print },		/* print */
	{ &vop_islocked_desc, nfs_islocked },	/* islocked */
	{ &vop_pathconf_desc, spec_pathconf },	/* pathconf */
	{ &vop_advlock_desc, spec_advlock },	/* advlock */
	{ &vop_blkatoff_desc, spec_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, spec_valloc },	/* valloc */
	{ &vop_reallocblks_desc, spec_reallocblks },	/* reallocblks */
	{ &vop_vfree_desc, spec_vfree },	/* vfree */
	{ &vop_truncate_desc, spec_truncate },	/* truncate */
	{ &vop_update_desc, nfs_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
	{ &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries };

#ifdef FIFO
int (**fifo_nfsv2nodeop_p)();
struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, fifo_lookup },	/* lookup */
	{ &vop_create_desc, fifo_create },	/* create */
	{ &vop_mknod_desc, fifo_mknod },	/* mknod */
	{ &vop_open_desc, fifo_open },		/* open */
	{ &vop_close_desc, nfsfifo_close },	/* close */
	{ &vop_access_desc, nfsspec_access },	/* access */
	{ &vop_getattr_desc, nfs_getattr },	/* getattr */
	{ &vop_setattr_desc, nfs_setattr },	/* setattr */
	{ &vop_read_desc, nfsfifo_read },	/* read */
	{ &vop_write_desc, nfsfifo_write },	/* write */
	{ &vop_ioctl_desc, fifo_ioctl },	/* ioctl */
	{ &vop_select_desc, fifo_select },	/* select */
	{ &vop_mmap_desc, fifo_mmap },		/* mmap */
	{ &vop_fsync_desc, nfs_fsync },		/* fsync */
	{ &vop_seek_desc, fifo_seek },		/* seek */
	{ &vop_remove_desc, fifo_remove },	/* remove */
	{ &vop_link_desc, fifo_link },		/* link */
	{ &vop_rename_desc, fifo_rename },	/* rename */
	{ &vop_mkdir_desc, fifo_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, fifo_rmdir },	/* rmdir */
	{ &vop_symlink_desc, fifo_symlink },	/* symlink */
	{ &vop_readdir_desc, fifo_readdir },	/* readdir */
	{ &vop_readlink_desc, fifo_readlink },	/* readlink */
	{ &vop_abortop_desc, fifo_abortop },	/* abortop */
	{ &vop_inactive_desc, nfs_inactive },	/* inactive */
	{ &vop_reclaim_desc, nfs_reclaim },	/* reclaim */
	{ &vop_lock_desc, nfs_lock },		/* lock */
	{ &vop_unlock_desc, nfs_unlock },	/* unlock */
	{ &vop_bmap_desc, fifo_bmap },		/* bmap */
	{ &vop_strategy_desc, fifo_badop },	/* strategy */
	{ &vop_print_desc, nfs_print },		/* print */
	{ &vop_islocked_desc, nfs_islocked },	/* islocked */
	{ &vop_pathconf_desc, fifo_pathconf },	/* pathconf */
	{ &vop_advlock_desc, fifo_advlock },	/* advlock */
	{ &vop_blkatoff_desc, fifo_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, fifo_valloc },	/* valloc */
	{ &vop_reallocblks_desc, fifo_reallocblks },	/* reallocblks */
	{ &vop_vfree_desc, fifo_vfree },	/* vfree */
	{ &vop_truncate_desc, fifo_truncate },	/* truncate */
	{ &vop_update_desc, nfs_update },	/* update */
	{ &vop_bwrite_desc, vn_bwrite },
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
	{ &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries };
#endif /* FIFO */

void nqnfs_clientlease();

/*
 * Global variables
 */
extern u_long nfs_procids[NFS_NPROCS];
extern u_long nfs_prog, nfs_vers, nfs_true, nfs_false;
extern char nfsiobuf[MAXPHYS+NBPG];
struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
int nfs_numasync = 0;
#define	DIRHDSIZ	(sizeof (struct dirent) - (MAXNAMLEN + 1))

/*
 * nfs null call from vfs.
 */
int
nfs_null(vp, cred, procp)
	struct vnode *vp;
	struct ucred *cred;
	struct proc *procp;
{
	caddr_t bpos, dpos;
	int error = 0;
	struct mbuf *mreq, *mrep, *md, *mb;
	
	nfsm_reqhead(vp, NFSPROC_NULL, 0);
	nfsm_request(vp, NFSPROC_NULL, procp, cred);
	nfsm_reqdone;
	return (error);
}

/*
 * nfs access vnode op.
 * For nfs, just return ok. File accesses may fail later.
 * For nqnfs, use the access rpc to check accessibility. If file modes are
 * changed on the server, accesses might still fail later.
 */
int
nfs_access(ap)
	struct vop_access_args /* {
		struct vnode *a_vp;
		int  a_mode;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register u_long *tl;
	register caddr_t cp;
	caddr_t bpos, dpos;
	int error = 0;
	struct mbuf *mreq, *mrep, *md, *mb, *mb2;

	/*
	 * For nqnfs, do an access rpc, otherwise you are stuck emulating
	 * ufs_access() locally using the vattr. This may not be correct,
	 * since the server may apply other access criteria such as
	 * client uid-->server uid mapping that we do not know about, but
	 * this is better than just returning anything that is lying about
	 * in the cache.
	 */
	if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) {
		nfsstats.rpccnt[NQNFSPROC_ACCESS]++;
		nfsm_reqhead(vp, NQNFSPROC_ACCESS, NFSX_FH + 3 * NFSX_UNSIGNED);
		nfsm_fhtom(vp);
		nfsm_build(tl, u_long *, 3 * NFSX_UNSIGNED);
		if (ap->a_mode & VREAD)
			*tl++ = nfs_true;
		else
			*tl++ = nfs_false;
		if (ap->a_mode & VWRITE)
			*tl++ = nfs_true;
		else
			*tl++ = nfs_false;
		if (ap->a_mode & VEXEC)
			*tl = nfs_true;
		else
			*tl = nfs_false;
		nfsm_request(vp, NQNFSPROC_ACCESS, ap->a_p, ap->a_cred);
		nfsm_reqdone;
		return (error);
	} else
		return (nfsspec_access(ap));
}

/*
 * nfs open vnode op
 * Check to see if the type is ok
 * and that deletion is not in progress.
 * For paged in text files, you will need to flush the page cache
 * if consistency is lost.
 */
/* ARGSUSED */
int
nfs_open(ap)
	struct vop_open_args /* {
		struct vnode *a_vp;
		int  a_mode;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	struct nfsnode *np = VTONFS(vp);
	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
	struct vattr vattr;
	int error;

	if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
		return (EACCES);
	if (vp->v_flag & VTEXT) {
	    /*
	     * Get a valid lease. If cached data is stale, flush it.
	     */
	    if (nmp->nm_flag & NFSMNT_NQNFS) {
		if (NQNFS_CKINVALID(vp, np, NQL_READ)) {
		    do {
			error = nqnfs_getlease(vp, NQL_READ, ap->a_cred, ap->a_p);
		    } while (error == NQNFS_EXPIRED);
		    if (error)
			return (error);
		    if (np->n_lrev != np->n_brev ||
			(np->n_flag & NQNFSNONCACHE)) {
			if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
				ap->a_p, 1)) == EINTR)
				return (error);
			(void) vnode_pager_uncache(vp);
			np->n_brev = np->n_lrev;
		    }
		}
	    } else {
		if (np->n_flag & NMODIFIED) {
			if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
				ap->a_p, 1)) == EINTR)
				return (error);
			(void) vnode_pager_uncache(vp);
			np->n_attrstamp = 0;
			np->n_direofoffset = 0;
			if (error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p))
				return (error);
			np->n_mtime = vattr.va_mtime.ts_sec;
		} else {
			if (error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p))
				return (error);
			if (np->n_mtime != vattr.va_mtime.ts_sec) {
				np->n_direofoffset = 0;
				if ((error = nfs_vinvalbuf(vp, V_SAVE,
					ap->a_cred, ap->a_p, 1)) == EINTR)
					return (error);
				(void) vnode_pager_uncache(vp);
				np->n_mtime = vattr.va_mtime.ts_sec;
			}
		}
	    }
	} else if ((nmp->nm_flag & NFSMNT_NQNFS) == 0)
		np->n_attrstamp = 0; /* For Open/Close consistency */
	return (0);
}

/*
 * nfs close vnode op
 * For reg files, invalidate any buffer cache entries.
 */
/* ARGSUSED */
int
nfs_close(ap)
	struct vop_close_args /* {
		struct vnodeop_desc *a_desc;
		struct vnode *a_vp;
		int  a_fflag;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct nfsnode *np = VTONFS(vp);
	int error = 0;

	if (vp->v_type == VREG) {
	    if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 &&
		(np->n_flag & NMODIFIED)) {
		error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 1);
		np->n_attrstamp = 0;
	    }
	    if (np->n_flag & NWRITEERR) {
		np->n_flag &= ~NWRITEERR;
		error = np->n_error;
	    }
	}
	return (error);
}

/*
 * nfs getattr call from vfs.
 */
int
nfs_getattr(ap)
	struct vop_getattr_args /* {
		struct vnode *a_vp;
		struct vattr *a_vap;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct nfsnode *np = VTONFS(vp);
	register caddr_t cp;
	caddr_t bpos, dpos;
	int error = 0;
	struct mbuf *mreq, *mrep, *md, *mb, *mb2;
	
	/*
	 * Update local times for special files.
	 */
	if (np->n_flag & (NACC | NUPD))
		np->n_flag |= NCHG;
	/*
	 * First look in the cache.
	 */
	if (nfs_getattrcache(vp, ap->a_vap) == 0)
		return (0);
	nfsstats.rpccnt[NFSPROC_GETATTR]++;
	nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH);
	nfsm_fhtom(vp);
	nfsm_request(vp, NFSPROC_GETATTR, ap->a_p, ap->a_cred);
	nfsm_loadattr(vp, ap->a_vap);
	nfsm_reqdone;
	return (error);
}

/*
 * nfs setattr call.
 */
int
nfs_setattr(ap)
	struct vop_setattr_args /* {
		struct vnodeop_desc *a_desc;
		struct vnode *a_vp;
		struct vattr *a_vap;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct nfsv2_sattr *sp;
	register caddr_t cp;
	register long t1;
	caddr_t bpos, dpos, cp2;
	u_long *tl;
	int error = 0, isnq;
	struct mbuf *mreq, *mrep, *md, *mb, *mb2;
	register struct vnode *vp = ap->a_vp;
	register struct nfsnode *np = VTONFS(vp);
	register struct vattr *vap = ap->a_vap;
	u_quad_t frev, tsize;

	if (vap->va_size != VNOVAL || vap->va_mtime.ts_sec != VNOVAL ||
		vap->va_atime.ts_sec != VNOVAL) {
		if (vap->va_size != VNOVAL) {
			if (np->n_flag & NMODIFIED) {
			    if (vap->va_size == 0)
				error = nfs_vinvalbuf(vp, 0, ap->a_cred,
					ap->a_p, 1);
			    else
				error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
					ap->a_p, 1);
			    if (error)
				return (error);
			}
			tsize = np->n_size;
			np->n_size = np->n_vattr.va_size = vap->va_size;
			vnode_pager_setsize(vp, (u_long)np->n_size);
		} else if ((np->n_flag & NMODIFIED) &&