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freebsd/sys/nfsclient/nfs_vnops.c
Poul-Henning Kamp 9626b608de Separate the struct bio related stuff out of <sys/buf.h> into 
<sys/bio.h>.

<sys/bio.h> is now a prerequisite for <sys/buf.h> but it shall
not be made a nested include according to bdes teachings on the
subject of nested includes.

Diskdrivers and similar stuff below specfs::strategy() should no
longer need to include <sys/buf.> unless they need caching of data.

Still a few bogus uses of struct buf to track down.

Repocopy by:    peter
2000-05-05 09:59:14 +00:00

3375 lines
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/*
* 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 8.16 (Berkeley) 5/27/95
* $FreeBSD$
*/
/*
* vnode op calls for Sun NFS version 2 and 3
*/
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/socket.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <miscfs/fifofs/fifo.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.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>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
/* Defs */
#define TRUE 1
#define FALSE 0
/*
* Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
* calls are not in getblk() and brelse() so that they would not be necessary
* here.
*/
#ifndef B_VMIO
#define vfs_busy_pages(bp, f)
#endif
static int nfsspec_read __P((struct vop_read_args *));
static int nfsspec_write __P((struct vop_write_args *));
static int nfsfifo_read __P((struct vop_read_args *));
static int nfsfifo_write __P((struct vop_write_args *));
static int nfsspec_close __P((struct vop_close_args *));
static int nfsfifo_close __P((struct vop_close_args *));
#define nfs_poll vop_nopoll
static int nfs_flush __P((struct vnode *,struct ucred *,int,struct proc *,int));
static int nfs_setattrrpc __P((struct vnode *,struct vattr *,struct ucred *,struct proc *));
static int nfs_lookup __P((struct vop_lookup_args *));
static int nfs_create __P((struct vop_create_args *));
static int nfs_mknod __P((struct vop_mknod_args *));
static int nfs_open __P((struct vop_open_args *));
static int nfs_close __P((struct vop_close_args *));
static int nfs_access __P((struct vop_access_args *));
static int nfs_getattr __P((struct vop_getattr_args *));
static int nfs_setattr __P((struct vop_setattr_args *));
static int nfs_read __P((struct vop_read_args *));
static int nfs_mmap __P((struct vop_mmap_args *));
static int nfs_fsync __P((struct vop_fsync_args *));
static int nfs_remove __P((struct vop_remove_args *));
static int nfs_link __P((struct vop_link_args *));
static int nfs_rename __P((struct vop_rename_args *));
static int nfs_mkdir __P((struct vop_mkdir_args *));
static int nfs_rmdir __P((struct vop_rmdir_args *));
static int nfs_symlink __P((struct vop_symlink_args *));
static int nfs_readdir __P((struct vop_readdir_args *));
static int nfs_bmap __P((struct vop_bmap_args *));
static int nfs_strategy __P((struct vop_strategy_args *));
static int nfs_lookitup __P((struct vnode *, const char *, int,
struct ucred *, struct proc *, struct nfsnode **));
static int nfs_sillyrename __P((struct vnode *,struct vnode *,struct componentname *));
static int nfsspec_access __P((struct vop_access_args *));
static int nfs_readlink __P((struct vop_readlink_args *));
static int nfs_print __P((struct vop_print_args *));
static int nfs_advlock __P((struct vop_advlock_args *));
static int nfs_bwrite __P((struct vop_bwrite_args *));
/*
* Global vfs data structures for nfs
*/
vop_t **nfsv2_vnodeop_p;
static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) vop_defaultop },
{ &vop_access_desc, (vop_t *) nfs_access },
{ &vop_advlock_desc, (vop_t *) nfs_advlock },
{ &vop_bmap_desc, (vop_t *) nfs_bmap },
{ &vop_bwrite_desc, (vop_t *) nfs_bwrite },
{ &vop_close_desc, (vop_t *) nfs_close },
{ &vop_create_desc, (vop_t *) nfs_create },
{ &vop_fsync_desc, (vop_t *) nfs_fsync },
{ &vop_getattr_desc, (vop_t *) nfs_getattr },
{ &vop_getpages_desc, (vop_t *) nfs_getpages },
{ &vop_putpages_desc, (vop_t *) nfs_putpages },
{ &vop_inactive_desc, (vop_t *) nfs_inactive },
{ &vop_lease_desc, (vop_t *) vop_null },
{ &vop_link_desc, (vop_t *) nfs_link },
{ &vop_lock_desc, (vop_t *) vop_sharedlock },
{ &vop_lookup_desc, (vop_t *) nfs_lookup },
{ &vop_mkdir_desc, (vop_t *) nfs_mkdir },
{ &vop_mknod_desc, (vop_t *) nfs_mknod },
{ &vop_mmap_desc, (vop_t *) nfs_mmap },
{ &vop_open_desc, (vop_t *) nfs_open },
{ &vop_poll_desc, (vop_t *) nfs_poll },
{ &vop_print_desc, (vop_t *) nfs_print },
{ &vop_read_desc, (vop_t *) nfs_read },
{ &vop_readdir_desc, (vop_t *) nfs_readdir },
{ &vop_readlink_desc, (vop_t *) nfs_readlink },
{ &vop_reclaim_desc, (vop_t *) nfs_reclaim },
{ &vop_remove_desc, (vop_t *) nfs_remove },
{ &vop_rename_desc, (vop_t *) nfs_rename },
{ &vop_rmdir_desc, (vop_t *) nfs_rmdir },
{ &vop_setattr_desc, (vop_t *) nfs_setattr },
{ &vop_strategy_desc, (vop_t *) nfs_strategy },
{ &vop_symlink_desc, (vop_t *) nfs_symlink },
{ &vop_write_desc, (vop_t *) nfs_write },
{ NULL, NULL }
};
static struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
{ &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };
VNODEOP_SET(nfsv2_vnodeop_opv_desc);
/*
* Special device vnode ops
*/
vop_t **spec_nfsv2nodeop_p;
static struct vnodeopv_entry_desc nfsv2_specop_entries[] = {
{ &vop_default_desc, (vop_t *) spec_vnoperate },
{ &vop_access_desc, (vop_t *) nfsspec_access },
{ &vop_close_desc, (vop_t *) nfsspec_close },
{ &vop_fsync_desc, (vop_t *) nfs_fsync },
{ &vop_getattr_desc, (vop_t *) nfs_getattr },
{ &vop_inactive_desc, (vop_t *) nfs_inactive },
{ &vop_lock_desc, (vop_t *) vop_sharedlock },
{ &vop_print_desc, (vop_t *) nfs_print },
{ &vop_read_desc, (vop_t *) nfsspec_read },
{ &vop_reclaim_desc, (vop_t *) nfs_reclaim },
{ &vop_setattr_desc, (vop_t *) nfs_setattr },
{ &vop_write_desc, (vop_t *) nfsspec_write },
{ NULL, NULL }
};
static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
{ &spec_nfsv2nodeop_p, nfsv2_specop_entries };
VNODEOP_SET(spec_nfsv2nodeop_opv_desc);
vop_t **fifo_nfsv2nodeop_p;
static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = {
{ &vop_default_desc, (vop_t *) fifo_vnoperate },
{ &vop_access_desc, (vop_t *) nfsspec_access },
{ &vop_close_desc, (vop_t *) nfsfifo_close },
{ &vop_fsync_desc, (vop_t *) nfs_fsync },
{ &vop_getattr_desc, (vop_t *) nfs_getattr },
{ &vop_inactive_desc, (vop_t *) nfs_inactive },
{ &vop_lock_desc, (vop_t *) vop_sharedlock },
{ &vop_print_desc, (vop_t *) nfs_print },
{ &vop_read_desc, (vop_t *) nfsfifo_read },
{ &vop_reclaim_desc, (vop_t *) nfs_reclaim },
{ &vop_setattr_desc, (vop_t *) nfs_setattr },
{ &vop_write_desc, (vop_t *) nfsfifo_write },
{ NULL, NULL }
};
static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
{ &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries };
VNODEOP_SET(fifo_nfsv2nodeop_opv_desc);
static int nfs_mknodrpc __P((struct vnode *dvp, struct vnode **vpp,
struct componentname *cnp,
struct vattr *vap));
static int nfs_removerpc __P((struct vnode *dvp, const char *name,
int namelen,
struct ucred *cred, struct proc *proc));
static int nfs_renamerpc __P((struct vnode *fdvp, const char *fnameptr,
int fnamelen, struct vnode *tdvp,
const char *tnameptr, int tnamelen,
struct ucred *cred, struct proc *proc));
static int nfs_renameit __P((struct vnode *sdvp,
struct componentname *scnp,
struct sillyrename *sp));
/*
* Global variables
*/
extern u_int32_t nfs_true, nfs_false;
extern u_int32_t nfs_xdrneg1;
extern struct nfsstats nfsstats;
extern nfstype nfsv3_type[9];
struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
int nfs_numasync = 0;
#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
SYSCTL_DECL(_vfs_nfs);
static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
&nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
static int nfsv3_commit_on_close = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
&nfsv3_commit_on_close, 0, "write+commit on close, else only write");
#if 0
SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
&nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
&nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
#endif
#define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \
| NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \
| NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
static int
nfs3_access_otw(struct vnode *vp,
int wmode,
struct proc *p,
struct ucred *cred)
{
const int v3 = 1;
u_int32_t *tl;
int error = 0, attrflag;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
caddr_t bpos, dpos, cp2;
register int32_t t1, t2;
register caddr_t cp;
u_int32_t rmode;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_ACCESS]++;
nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
nfsm_fhtom(vp, v3);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(wmode);
nfsm_request(vp, NFSPROC_ACCESS, p, cred);
nfsm_postop_attr(vp, attrflag);
if (!error) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
rmode = fxdr_unsigned(u_int32_t, *tl);
np->n_mode = rmode;
np->n_modeuid = cred->cr_uid;
np->n_modestamp = time_second;
}
nfsm_reqdone;
return error;
}
/*
* nfs access vnode op.
* For nfs version 2, just return ok. File accesses may fail later.
* For nfs version 3, use the access rpc to check accessibility. If file modes
* are changed on the server, accesses might still fail later.
*/
static 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;
int error = 0;
u_int32_t mode, wmode;
int v3 = NFS_ISV3(vp);
struct nfsnode *np = VTONFS(vp);
/*
* Disallow write attempts on filesystems mounted read-only;
* unless the file is a socket, fifo, or a block or character
* device resident on the filesystem.
*/
if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}
/*
* For nfs v3, check to see if we have done this recently, and if
* so return our cached result instead of making an ACCESS call.
* If not, 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.
*/
if (v3) {
if (ap->a_mode & VREAD)
mode = NFSV3ACCESS_READ;
else
mode = 0;
if (vp->v_type != VDIR) {
if (ap->a_mode & VWRITE)
mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
if (ap->a_mode & VEXEC)
mode |= NFSV3ACCESS_EXECUTE;
} else {
if (ap->a_mode & VWRITE)
mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
NFSV3ACCESS_DELETE);
if (ap->a_mode & VEXEC)
mode |= NFSV3ACCESS_LOOKUP;
}
/* XXX safety belt, only make blanket request if caching */
if (nfsaccess_cache_timeout > 0) {
wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
} else {
wmode = mode;
}
/*
* Does our cached result allow us to give a definite yes to
* this request?
*/
if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) &&
(ap->a_cred->cr_uid == np->n_modeuid) &&
((np->n_mode & mode) == mode)) {
nfsstats.accesscache_hits++;
} else {
/*
* Either a no, or a don't know. Go to the wire.
*/
nfsstats.accesscache_misses++;
error = nfs3_access_otw(vp, wmode, ap->a_p,ap->a_cred);
if (!error) {
if ((np->n_mode & mode) != mode) {
error = EACCES;
}
}
}
return (error);
} else {
if ((error = nfsspec_access(ap)) != 0)
return (error);
/*
* Attempt to prevent a mapped root from accessing a file
* which it shouldn't. We try to read a byte from the file
* if the user is root and the file is not zero length.
* After calling nfsspec_access, we should have the correct
* file size cached.
*/
if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD)
&& VTONFS(vp)->n_size > 0) {
struct iovec aiov;
struct uio auio;
char buf[1];
aiov.iov_base = buf;
aiov.iov_len = 1;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_resid = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_procp = ap->a_p;
if (vp->v_type == VREG)
error = nfs_readrpc(vp, &auio, ap->a_cred);
else if (vp->v_type == VDIR) {
char* bp;
bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
aiov.iov_base = bp;
aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
error = nfs_readdirrpc(vp, &auio, ap->a_cred);
free(bp, M_TEMP);
} else if (vp->v_type == VLNK)
error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
else
error = EACCES;
}
return (error);
}
}
/*
* 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 */
static 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) {
#ifdef DIAGNOSTIC
printf("open eacces vtyp=%d\n",vp->v_type);
#endif
return (EACCES);
}
/*
* Get a valid lease. If cached data is stale, flush it.
*/
if (nmp->nm_flag & NFSMNT_NQNFS) {
if (NQNFS_CKINVALID(vp, np, ND_READ)) {
do {
error = nqnfs_getlease(vp, ND_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);
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);
np->n_attrstamp = 0;
if (vp->v_type == VDIR)
np->n_direofoffset = 0;
error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
if (error)
return (error);
np->n_mtime = vattr.va_mtime.tv_sec;
} else {
error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
if (error)
return (error);
if (np->n_mtime != vattr.va_mtime.tv_sec) {
if (vp->v_type == VDIR)
np->n_direofoffset = 0;
if ((error = nfs_vinvalbuf(vp, V_SAVE,
ap->a_cred, ap->a_p, 1)) == EINTR)
return (error);
np->n_mtime = vattr.va_mtime.tv_sec;
}
}
}
if ((nmp->nm_flag & NFSMNT_NQNFS) == 0)
np->n_attrstamp = 0; /* For Open/Close consistency */
return (0);
}
/*
* nfs close vnode op
* What an NFS client should do upon close after writing is a debatable issue.
* Most NFS clients push delayed writes to the server upon close, basically for
* two reasons:
* 1 - So that any write errors may be reported back to the client process
* doing the close system call. By far the two most likely errors are
* NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
* 2 - To put a worst case upper bound on cache inconsistency between
* multiple clients for the file.
* There is also a consistency problem for Version 2 of the protocol w.r.t.
* not being able to tell if other clients are writing a file concurrently,
* since there is no way of knowing if the changed modify time in the reply
* is only due to the write for this client.
* (NFS Version 3 provides weak cache consistency data in the reply that
* should be sufficient to detect and handle this case.)
*
* The current code does the following:
* for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
* for NFS Version 3 - flush dirty buffers to the server but don't invalidate
* or commit them (this satisfies 1 and 2 except for the
* case where the server crashes after this close but
* before the commit RPC, which is felt to be "good
* enough". Changing the last argument to nfs_flush() to
* a 1 would force a commit operation, if it is felt a
* commit is necessary now.
* for NQNFS - do nothing now, since 2 is dealt with via leases and
* 1 should be dealt with via an fsync() system call for
* cases where write errors are important.
*/
/* ARGSUSED */
static 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)) {
if (NFS_ISV3(vp)) {
/*
* Under NFSv3 we have dirty buffers to dispose of. We
* must flush them to the NFS server. We have the option
* of waiting all the way through the commit rpc or just
* waiting for the initial write. The default is to only
* wait through the initial write so the data is in the
* server's cache, which is roughly similar to the state
* a standard disk subsystem leaves the file in on close().
*
* We cannot clear the NMODIFIED bit in np->n_flag due to
* potential races with other processes, and certainly
* cannot clear it if we don't commit.
*/
int cm = nfsv3_commit_on_close ? 1 : 0;
error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, cm);
/* np->n_flag &= ~NMODIFIED; */
} else {
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.
*/
static 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;
register u_int32_t *tl;
register int32_t t1, t2;
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(vp);
/*
* 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);
if (v3 && nfsaccess_cache_timeout > 0) {
nfsstats.accesscache_misses++;
nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_p, ap->a_cred);
if (nfs_getattrcache(vp, ap->a_vap) == 0)
return (0);
}
nfsstats.rpccnt[NFSPROC_GETATTR]++;
nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_GETATTR, ap->a_p, ap->a_cred);
if (!error) {
nfsm_loadattr(vp, ap->a_vap);
}
nfsm_reqdone;
return (error);
}
/*
* nfs setattr call.
*/
static 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 vnode *vp = ap->a_vp;
register struct nfsnode *np = VTONFS(vp);
register struct vattr *vap = ap->a_vap;
int error = 0;
u_quad_t tsize;
#ifndef nolint
tsize = (u_quad_t)0;
#endif
/*
* Setting of flags is not supported.
*/
if (vap->va_flags != VNOVAL)
return (EOPNOTSUPP);
/*
* Disallow write attempts if the filesystem is mounted read-only.
*/
if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
(vp->v_mount->mnt_flag & MNT_RDONLY))
return (EROFS);
if (vap->va_size != VNOVAL) {
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VCHR:
case VBLK:
case VSOCK:
case VFIFO:
if (vap->va_mtime.tv_sec == VNOVAL &&
vap->va_atime.tv_sec == VNOVAL &&
vap->va_mode == (mode_t)VNOVAL &&
vap->va_uid == (uid_t)VNOVAL &&
vap->va_gid == (gid_t)VNOVAL)
return (0);
vap->va_size = VNOVAL;
break;
default:
/*
* Disallow write attempts if the filesystem is
* mounted read-only.
*/
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
vnode_pager_setsize(vp, vap->va_size);
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) {
vnode_pager_setsize(vp, np->n_size);
return (error);
}
}
tsize = np->n_size;
np->n_size = np->n_vattr.va_size = vap->va_size;
};
} else if ((vap->va_mtime.tv_sec != VNOVAL ||
vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
vp->v_type == VREG &&
(error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
ap->a_p, 1)) == EINTR)
return (error);
error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_p);
if (error && vap->va_size != VNOVAL) {
np->n_size = np->n_vattr.va_size = tsize;
vnode_pager_setsize(vp, np->n_size);
}
return (error);
}
/*
* Do an nfs setattr rpc.
*/
static int
nfs_setattrrpc(vp, vap, cred, procp)
register struct vnode *vp;
register struct vattr *vap;
struct ucred *cred;
struct proc *procp;
{
register struct nfsv2_sattr *sp;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
u_int32_t *tl;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_SETATTR]++;
nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
nfsm_fhtom(vp, v3);
if (v3) {
nfsm_v3attrbuild(vap, TRUE);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = nfs_false;
} else {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
if (vap->va_mode == (mode_t)VNOVAL)
sp->sa_mode = nfs_xdrneg1;
else
sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
if (vap->va_uid == (uid_t)VNOVAL)
sp->sa_uid = nfs_xdrneg1;
else
sp->sa_uid = txdr_unsigned(vap->va_uid);
if (vap->va_gid == (gid_t)VNOVAL)
sp->sa_gid = nfs_xdrneg1;
else
sp->sa_gid = txdr_unsigned(vap->va_gid);
sp->sa_size = txdr_unsigned(vap->va_size);
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(vp, NFSPROC_SETATTR, procp, cred);
if (v3) {
nfsm_wcc_data(vp, wccflag);
} else
nfsm_loadattr(vp, (struct vattr *)0);
nfsm_reqdone;
return (error);
}
/*
* nfs lookup call, one step at a time...
* First look in cache
* If not found, unlock the directory nfsnode and do the rpc
*/
static int
nfs_lookup(ap)
struct vop_lookup_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap;
{
struct componentname *cnp = ap->a_cnp;
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
int flags = cnp->cn_flags;
struct vnode *newvp;
u_int32_t *tl;
caddr_t cp;
int32_t t1, t2;
struct nfsmount *nmp;
caddr_t bpos, dpos, cp2;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int lockparent, wantparent, error = 0, attrflag, fhsize;
int v3 = NFS_ISV3(dvp);
struct proc *p = cnp->cn_proc;
*vpp = NULLVP;
if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if (dvp->v_type != VDIR)
return (ENOTDIR);
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
nmp = VFSTONFS(dvp->v_mount);
np = VTONFS(dvp);
if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
struct vattr vattr;
int vpid;
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, p)) != 0) {
*vpp = NULLVP;
return (error);
}
newvp = *vpp;
vpid = newvp->v_id;
/*
* See the comment starting `Step through' in ufs/ufs_lookup.c
* for an explanation of the locking protocol
*/
if (dvp == newvp) {
VREF(newvp);
error = 0;
} else if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, p);
error = vget(newvp, LK_EXCLUSIVE, p);
if (!error && lockparent && (flags & ISLASTCN))
error = vn_lock(dvp, LK_EXCLUSIVE, p);
} else {
error = vget(newvp, LK_EXCLUSIVE, p);
if (!lockparent || error || !(flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, p);
}
if (!error) {
if (vpid == newvp->v_id) {
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, p)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
nfsstats.lookupcache_hits++;
if (cnp->cn_nameiop != LOOKUP &&
(flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
return (0);
}
cache_purge(newvp);
}
vput(newvp);
if (lockparent && dvp != newvp && (flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, p);
}
error = vn_lock(dvp, LK_EXCLUSIVE, p);
*vpp = NULLVP;
if (error)
return (error);
}
error = 0;
newvp = NULLVP;
nfsstats.lookupcache_misses++;
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
len = cnp->cn_namelen;
nfsm_reqhead(dvp, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_proc, cnp->cn_cred);
if (error) {
nfsm_postop_attr(dvp, attrflag);
m_freem(mrep);
goto nfsmout;
}
nfsm_getfh(fhp, fhsize, v3);
/*
* Handle RENAME case...
*/
if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) {
if (NFS_CMPFH(np, fhp, fhsize)) {
m_freem(mrep);
return (EISDIR);
}
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error) {
m_freem(mrep);
return (error);
}
newvp = NFSTOV(np);
if (v3) {
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
} else
nfsm_loadattr(newvp, (struct vattr *)0);
*vpp = newvp;
m_freem(mrep);
cnp->cn_flags |= SAVENAME;
if (!lockparent)
VOP_UNLOCK(dvp, 0, p);
return (0);
}
if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, p);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error) {
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p);
return (error);
}
newvp = NFSTOV(np);
if (lockparent && (flags & ISLASTCN) &&
(error = vn_lock(dvp, LK_EXCLUSIVE, p))) {
vput(newvp);
return (error);
}
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
} else {
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error) {
m_freem(mrep);
return (error);
}
if (!lockparent || !(flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, p);
newvp = NFSTOV(np);
}
if (v3) {
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
} else
nfsm_loadattr(newvp, (struct vattr *)0);
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
if ((cnp->cn_flags & MAKEENTRY) &&
(cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
np->n_ctime = np->n_vattr.va_ctime.tv_sec;
cache_enter(dvp, newvp, cnp);
}
*vpp = newvp;
nfsm_reqdone;
if (error) {
if (newvp != NULLVP) {
vrele(newvp);
*vpp = NULLVP;
}
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT) {
if (!lockparent)
VOP_UNLOCK(dvp, 0, p);
if (dvp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else
error = EJUSTRETURN;
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
}
return (error);
}
/*
* nfs read call.
* Just call nfs_bioread() to do the work.
*/
static int
nfs_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
if (vp->v_type != VREG)
return (EPERM);
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
}
/*
* nfs readlink call
*/
static int
nfs_readlink(ap)
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
if (vp->v_type != VLNK)
return (EINVAL);
return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Do a readlink rpc.
* Called by nfs_doio() from below the buffer cache.
*/
int
nfs_readlinkrpc(vp, uiop, cred)
register struct vnode *vp;
struct uio *uiop;
struct ucred *cred;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int error = 0, len, attrflag;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_READLINK]++;
nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_READLINK, uiop->uio_procp, cred);
if (v3)
nfsm_postop_attr(vp, attrflag);
if (!error) {
nfsm_strsiz(len, NFS_MAXPATHLEN);
if (len == NFS_MAXPATHLEN) {
struct nfsnode *np = VTONFS(vp);
if (np->n_size && np->n_size < NFS_MAXPATHLEN)
len = np->n_size;
}
nfsm_mtouio(uiop, len);
}
nfsm_reqdone;
return (error);
}
/*
* nfs read rpc call
* Ditto above
*/
int
nfs_readrpc(vp, uiop, cred)
register struct vnode *vp;
struct uio *uiop;
struct ucred *cred;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct nfsmount *nmp;
int error = 0, len, retlen, tsiz, eof, attrflag;
int v3 = NFS_ISV3(vp);
#ifndef nolint
eof = 0;
#endif
nmp = VFSTONFS(vp->v_mount);
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
return (EFBIG);
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_READ]++;
len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
nfsm_fhtom(vp, v3);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3);
if (v3) {
txdr_hyper(uiop->uio_offset, tl);
*(tl + 2) = txdr_unsigned(len);
} else {
*tl++ = txdr_unsigned(uiop->uio_offset);
*tl++ = txdr_unsigned(len);
*tl = 0;
}
nfsm_request(vp, NFSPROC_READ, uiop->uio_procp, cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
if (error) {
m_freem(mrep);
goto nfsmout;
}
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
eof = fxdr_unsigned(int, *(tl + 1));
} else
nfsm_loadattr(vp, (struct vattr *)0);
nfsm_strsiz(retlen, nmp->nm_rsize);
nfsm_mtouio(uiop, retlen);
m_freem(mrep);
tsiz -= retlen;
if (v3) {
if (eof || retlen == 0)
tsiz = 0;
} else if (retlen < len)
tsiz = 0;
}
nfsmout:
return (error);
}
/*
* nfs write call
*/
int
nfs_writerpc(vp, uiop, cred, iomode, must_commit)
register struct vnode *vp;
register struct uio *uiop;
struct ucred *cred;
int *iomode, *must_commit;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2, backup;
caddr_t bpos, dpos, cp2;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
#ifndef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfs: writerpc iovcnt > 1");
#endif
*must_commit = 0;
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
return (EFBIG);
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
nfsm_reqhead(vp, NFSPROC_WRITE,
NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(vp, v3);
if (v3) {
nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
txdr_hyper(uiop->uio_offset, tl);
tl += 2;
*tl++ = txdr_unsigned(len);
*tl++ = txdr_unsigned(*iomode);
*tl = txdr_unsigned(len);
} else {
register u_int32_t x;
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
/* Set both "begin" and "current" to non-garbage. */
x = txdr_unsigned((u_int32_t)uiop->uio_offset);
*tl++ = x; /* "begin offset" */
*tl++ = x; /* "current offset" */
x = txdr_unsigned(len);
*tl++ = x; /* total to this offset */
*tl = x; /* size of this write */
}
nfsm_uiotom(uiop, len);
nfsm_request(vp, NFSPROC_WRITE, uiop->uio_procp, cred);
if (v3) {
wccflag = NFSV3_WCCCHK;
nfsm_wcc_data(vp, wccflag);
if (!error) {
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED
+ NFSX_V3WRITEVERF);
rlen = fxdr_unsigned(int, *tl++);
if (rlen == 0) {
error = NFSERR_IO;
m_freem(mrep);
break;
} else if (rlen < len) {
backup = len - rlen;
uiop->uio_iov->iov_base -= backup;
uiop->uio_iov->iov_len += backup;
uiop->uio_offset -= backup;
uiop->uio_resid += backup;
len = rlen;
}
commit = fxdr_unsigned(int, *tl++);
/*
* Return the lowest committment level
* obtained by any of the RPCs.
*/
if (committed == NFSV3WRITE_FILESYNC)
committed = commit;
else if (committed == NFSV3WRITE_DATASYNC &&
commit == NFSV3WRITE_UNSTABLE)
committed = commit;
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
NFSX_V3WRITEVERF);
nmp->nm_state |= NFSSTA_HASWRITEVERF;
} else if (bcmp((caddr_t)tl,
(caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
*must_commit = 1;
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
NFSX_V3WRITEVERF);
}
}
} else
nfsm_loadattr(vp, (struct vattr *)0);
if (wccflag)
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec;
m_freem(mrep);
if (error)
break;
tsiz -= len;
}
nfsmout:
if (vp->v_mount->mnt_flag & MNT_ASYNC)
committed = NFSV3WRITE_FILESYNC;
*iomode = committed;
if (error)
uiop->uio_resid = tsiz;
return (error);
}
/*
* nfs mknod rpc
* For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
* mode set to specify the file type and the size field for rdev.
*/
static int
nfs_mknodrpc(dvp, vpp, cnp, vap)
register struct vnode *dvp;
register struct vnode **vpp;
register struct componentname *cnp;
register struct vattr *vap;
{
register struct nfsv2_sattr *sp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
struct vnode *newvp = (struct vnode *)0;
struct nfsnode *np = (struct nfsnode *)0;
struct vattr vattr;
char *cp2;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
u_int32_t rdev;
int v3 = NFS_ISV3(dvp);
if (vap->va_type == VCHR || vap->va_type == VBLK)
rdev = txdr_unsigned(vap->va_rdev);
else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
rdev = nfs_xdrneg1;
else {
return (EOPNOTSUPP);
}
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
return (error);
}
nfsstats.rpccnt[NFSPROC_MKNOD]++;
nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
+ nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (v3) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl++ = vtonfsv3_type(vap->va_type);
nfsm_v3attrbuild(vap, FALSE);
if (vap->va_type == VCHR || vap->va_type == VBLK) {
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(umajor(vap->va_rdev));
*tl = txdr_unsigned(uminor(vap->va_rdev));
}
} else {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = rdev;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_proc, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
if (newvp) {
vput(newvp);
newvp = (struct vnode *)0;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
if (!error)
newvp = NFSTOV(np);
}
}
if (v3)
nfsm_wcc_data(dvp, wccflag);
nfsm_reqdone;
if (error) {
if (newvp)
vput(newvp);
} else {
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
*vpp = newvp;
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
return (error);
}
/*
* nfs mknod vop
* just call nfs_mknodrpc() to do the work.
*/
/* ARGSUSED */
static int
nfs_mknod(ap)
struct vop_mknod_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap);
}
static u_long create_verf;
/*
* nfs file create call
*/
static int
nfs_create(ap)
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct vattr *vap = ap->a_vap;
register struct componentname *cnp = ap->a_cnp;
register struct nfsv2_sattr *sp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
struct nfsnode *np = (struct nfsnode *)0;
struct vnode *newvp = (struct vnode *)0;
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct vattr vattr;
int v3 = NFS_ISV3(dvp);
/*
* Oops, not for me..
*/
if (vap->va_type == VSOCK)
return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
return (error);
}
if (vap->va_vaflags & VA_EXCLUSIVE)
fmode |= O_EXCL;
again:
nfsstats.rpccnt[NFSPROC_CREATE]++;
nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (v3) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
if (fmode & O_EXCL) {
*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF);
#ifdef INET
if (!TAILQ_EMPTY(&in_ifaddrhead))
*tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr;
else
#endif
*tl++ = create_verf;
*tl = ++create_verf;
} else {
*tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
nfsm_v3attrbuild(vap, FALSE);
}
} else {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = 0;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_proc, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
if (newvp) {
vput(newvp);
newvp = (struct vnode *)0;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np);
if (!error)
newvp = NFSTOV(np);
}
}
if (v3)
nfsm_wcc_data(dvp, wccflag);
nfsm_reqdone;
if (error) {
if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
fmode &= ~O_EXCL;
goto again;
}
if (newvp)
vput(newvp);
} else if (v3 && (fmode & O_EXCL))
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc);
if (!error) {
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
return (error);
}
/*
* nfs file remove call
* To try and make nfs semantics closer to ufs semantics, a file that has
* other processes using the vnode is renamed instead of removed and then
* removed later on the last close.
* - If v_usecount > 1
* If a rename is not already in the works
* call nfs_sillyrename() to set it up
* else
* do the remove rpc
*/
static int
nfs_remove(ap)
struct vop_remove_args /* {
struct vnodeop_desc *a_desc;
struct vnode * a_dvp;
struct vnode * a_vp;
struct componentname * a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *dvp = ap->a_dvp;
register struct componentname *cnp = ap->a_cnp;
register struct nfsnode *np = VTONFS(vp);
int error = 0;
struct vattr vattr;
#ifndef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("nfs_remove: no name");
if (vp->v_usecount < 1)
panic("nfs_remove: bad v_usecount");
#endif
if (vp->v_type == VDIR)
error = EPERM;
else if (vp->v_usecount == 1 || (np->n_sillyrename &&
VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_proc) == 0 &&
vattr.va_nlink > 1)) {
/*
* Purge the name cache so that the chance of a lookup for
* the name succeeding while the remove is in progress is
* minimized. Without node locking it can still happen, such
* that an I/O op returns ESTALE, but since you get this if
* another host removes the file..
*/
cache_purge(vp);
/*
* throw away biocache buffers, mainly to avoid
* unnecessary delayed writes later.
*/
error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_proc, 1);
/* Do the rpc */
if (error != EINTR)
error = nfs_removerpc(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc);
/*
* Kludge City: If the first reply to the remove rpc is lost..
* the reply to the retransmitted request will be ENOENT
* since the file was in fact removed
* Therefore, we cheat and return success.
*/
if (error == ENOENT)
error = 0;
} else if (!np->n_sillyrename)
error = nfs_sillyrename(dvp, vp, cnp);
np->n_attrstamp = 0;
return (error);
}
/*
* nfs file remove rpc called from nfs_inactive
*/
int
nfs_removeit(sp)
register struct sillyrename *sp;
{
return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
(struct proc *)0));
}
/*
* Nfs remove rpc, called from nfs_remove() and nfs_removeit().
*/
static int
nfs_removerpc(dvp, name, namelen, cred, proc)
register struct vnode *dvp;
const char *name;
int namelen;
struct ucred *cred;
struct proc *proc;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_REMOVE]++;
nfsm_reqhead(dvp, NFSPROC_REMOVE,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
nfsm_fhtom(dvp, v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_REMOVE, proc, cred);
if (v3)
nfsm_wcc_data(dvp, wccflag);
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
return (error);
}
/*
* nfs file rename call
*/
static int
nfs_rename(ap)
struct vop_rename_args /* {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */ *ap;
{
register struct vnode *fvp = ap->a_fvp;
register struct vnode *tvp = ap->a_tvp;
register struct vnode *fdvp = ap->a_fdvp;
register struct vnode *tdvp = ap->a_tdvp;
register struct componentname *tcnp = ap->a_tcnp;
register struct componentname *fcnp = ap->a_fcnp;
int error;
#ifndef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("nfs_rename: no name");
#endif
/* Check for cross-device rename */
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
goto out;
}
/*
* We have to flush B_DELWRI data prior to renaming
* the file. If we don't, the delayed-write buffers
* can be flushed out later after the file has gone stale
* under NFSV3. NFSV2 does not have this problem because
* ( as far as I can tell ) it flushes dirty buffers more
* often.
*/
VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_proc);
if (tvp)
VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_proc);
/*
* If the tvp exists and is in use, sillyrename it before doing the
* rename of the new file over it.
* XXX Can't sillyrename a directory.
*/
if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
vput(tvp);
tvp = NULL;
}
error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
tcnp->cn_proc);
if (fvp->v_type == VDIR) {
if (tvp != NULL && tvp->v_type == VDIR)
cache_purge(tdvp);
cache_purge(fdvp);
}
out:
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fdvp);
vrele(fvp);
/*
* Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
*/
if (error == ENOENT)
error = 0;
return (error);
}
/*
* nfs file rename rpc called from nfs_remove() above
*/
static int
nfs_renameit(sdvp, scnp, sp)
struct vnode *sdvp;
struct componentname *scnp;
register struct sillyrename *sp;
{
return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_proc));
}
/*
* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
*/
static int
nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, proc)
register struct vnode *fdvp;
const char *fnameptr;
int fnamelen;
register struct vnode *tdvp;
const char *tnameptr;
int tnamelen;
struct ucred *cred;
struct proc *proc;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(fdvp);
nfsstats.rpccnt[NFSPROC_RENAME]++;
nfsm_reqhead(fdvp, NFSPROC_RENAME,
(NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
nfsm_rndup(tnamelen));
nfsm_fhtom(fdvp, v3);
nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
nfsm_fhtom(tdvp, v3);
nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
nfsm_request(fdvp, NFSPROC_RENAME, proc, cred);
if (v3) {
nfsm_wcc_data(fdvp, fwccflag);
nfsm_wcc_data(tdvp, twccflag);
}
nfsm_reqdone;
VTONFS(fdvp)->n_flag |= NMODIFIED;
VTONFS(tdvp)->n_flag |= NMODIFIED;
if (!fwccflag)
VTONFS(fdvp)->n_attrstamp = 0;
if (!twccflag)
VTONFS(tdvp)->n_attrstamp = 0;
return (error);
}
/*
* nfs hard link create call
*/
static int
nfs_link(ap)
struct vop_link_args /* {
struct vnode *a_tdvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *tdvp = ap->a_tdvp;
register struct componentname *cnp = ap->a_cnp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3;
if (vp->v_mount != tdvp->v_mount) {
return (EXDEV);
}
/*
* Push all writes to the server, so that the attribute cache
* doesn't get "out of sync" with the server.
* XXX There should be a better way!
*/
VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_proc);
v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_LINK]++;
nfsm_reqhead(vp, NFSPROC_LINK,
NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(vp, v3);
nfsm_fhtom(tdvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
nfsm_request(vp, NFSPROC_LINK, cnp->cn_proc, cnp->cn_cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
nfsm_wcc_data(tdvp, wccflag);
}
nfsm_reqdone;
VTONFS(tdvp)->n_flag |= NMODIFIED;
if (!attrflag)
VTONFS(vp)->n_attrstamp = 0;
if (!wccflag)
VTONFS(tdvp)->n_attrstamp = 0;
/*
* Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
*/
if (error == EEXIST)
error = 0;
return (error);
}
/*
* nfs symbolic link create call
*/
static int
nfs_symlink(ap)
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct vattr *vap = ap->a_vap;
register struct componentname *cnp = ap->a_cnp;
register struct nfsv2_sattr *sp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct vnode *newvp = (struct vnode *)0;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
slen = strlen(ap->a_target);
nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (v3) {
nfsm_v3attrbuild(vap, FALSE);
}
nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
if (!v3) {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = nfs_xdrneg1;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
/*
* Issue the NFS request and get the rpc response.
*
* Only NFSv3 responses returning an error of 0 actually return
* a file handle that can be converted into newvp without having
* to do an extra lookup rpc.
*/
nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_proc, cnp->cn_cred);
if (v3) {
if (error == 0)
nfsm_mtofh(dvp, newvp, v3, gotvp);
nfsm_wcc_data(dvp, wccflag);
}
/*
* out code jumps -> here, mrep is also freed.
*/
nfsm_reqdone;
/*
* If we get an EEXIST error, silently convert it to no-error
* in case of an NFS retry.
*/
if (error == EEXIST)
error = 0;
/*
* If we do not have (or no longer have) an error, and we could
* not extract the newvp from the response due to the request being
* NFSv2 or the error being EEXIST. We have to do a lookup in order
* to obtain a newvp to return.
*/
if (error == 0 && newvp == NULL) {
struct nfsnode *np = NULL;
error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_cred, cnp->cn_proc, &np);
if (!error)
newvp = NFSTOV(np);
}
if (error) {
if (newvp)
vput(newvp);
} else {
*ap->a_vpp = newvp;
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
return (error);
}
/*
* nfs make dir call
*/
static int
nfs_mkdir(ap)
struct vop_mkdir_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct vattr *vap = ap->a_vap;
register struct componentname *cnp = ap->a_cnp;
register struct nfsv2_sattr *sp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
register int len;
struct nfsnode *np = (struct nfsnode *)0;
struct vnode *newvp = (struct vnode *)0;
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
int gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct vattr vattr;
int v3 = NFS_ISV3(dvp);
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) != 0) {
return (error);
}
len = cnp->cn_namelen;
nfsstats.rpccnt[NFSPROC_MKDIR]++;
nfsm_reqhead(dvp, NFSPROC_MKDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
if (v3) {
nfsm_v3attrbuild(vap, FALSE);
} else {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = nfs_xdrneg1;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_proc, cnp->cn_cred);
if (!error)
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (v3)
nfsm_wcc_data(dvp, wccflag);
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
/*
* Kludge: Map EEXIST => 0 assuming that you have a reply to a retry
* if we can succeed in looking up the directory.
*/
if (error == EEXIST || (!error && !gotvp)) {
if (newvp) {
vrele(newvp);
newvp = (struct vnode *)0;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
cnp->cn_proc, &np);
if (!error) {
newvp = NFSTOV(np);
if (newvp->v_type != VDIR)
error = EEXIST;
}
}
if (error) {
if (newvp)
vrele(newvp);
} else
*ap->a_vpp = newvp;
return (error);
}
/*
* nfs remove directory call
*/
static int
nfs_rmdir(ap)
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *dvp = ap->a_dvp;
register struct componentname *cnp = ap->a_cnp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
int v3 = NFS_ISV3(dvp);
if (dvp == vp)
return (EINVAL);
nfsstats.rpccnt[NFSPROC_RMDIR]++;
nfsm_reqhead(dvp, NFSPROC_RMDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_proc, cnp->cn_cred);
if (v3)
nfsm_wcc_data(dvp, wccflag);
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
VTONFS(dvp)->n_attrstamp = 0;
cache_purge(dvp);
cache_purge(vp);
/*
* Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
*/
if (error == ENOENT)
error = 0;
return (error);
}
/*
* nfs readdir call
*/
static int
nfs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct nfsnode *np = VTONFS(vp);
register struct uio *uio = ap->a_uio;
int tresid, error;
struct vattr vattr;
if (vp->v_type != VDIR)
return (EPERM);
/*
* First, check for hit on the EOF offset cache
*/
if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
(np->n_flag & NMODIFIED) == 0) {
if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) {
if (NQNFS_CKCACHABLE(vp, ND_READ)) {
nfsstats.direofcache_hits++;
return (0);
}
} else if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_procp) == 0 &&
np->n_mtime == vattr.va_mtime.tv_sec) {
nfsstats.direofcache_hits++;
return (0);
}
}
/*
* Call nfs_bioread() to do the real work.
*/
tresid = uio->uio_resid;
error = nfs_bioread(vp, uio, 0, ap->a_cred);
if (!error && uio->uio_resid == tresid)
nfsstats.direofcache_misses++;
return (error);
}
/*
* Readdir rpc call.
* Called from below the buffer cache by nfs_doio().
*/
int
nfs_readdirrpc(vp, uiop, cred)
struct vnode *vp;
register struct uio *uiop;
struct ucred *cred;
{
register int len, left;
register struct dirent *dp = NULL;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
register nfsuint64 *cookiep;
caddr_t bpos, dpos, cp2;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
nfsuint64 cookie;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct nfsnode *dnp = VTONFS(vp);
u_quad_t fileno;
int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
int attrflag;
int v3 = NFS_ISV3(vp);
#ifndef DIAGNOSTIC
if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
(uiop->uio_resid & (DIRBLKSIZ - 1)))
panic("nfs readdirrpc bad uio");
#endif
/*
* If there is no cookie, assume directory was stale.
*/
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
if (cookiep)
cookie = *cookiep;
else
return (NFSERR_BAD_COOKIE);
/*
* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of DIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough) {
nfsstats.rpccnt[NFSPROC_READDIR]++;
nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
NFSX_READDIR(v3));
nfsm_fhtom(vp, v3);
if (v3) {
nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
} else {
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
}
*tl = txdr_unsigned(nmp->nm_readdirsize);
nfsm_request(vp, NFSPROC_READDIR, uiop->uio_procp, cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
if (!error) {
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl;
} else {
m_freem(mrep);
goto nfsmout;
}
}
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
if (v3) {
nfsm_dissect(tl, u_int32_t *,
3 * NFSX_UNSIGNED);
fileno = fxdr_hyper(tl);
len = fxdr_unsigned(int, *(tl + 2));
} else {
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
fileno = fxdr_unsigned(u_quad_t, *tl++);
len = fxdr_unsigned(int, *tl);
}
if (len <= 0 || len > NFS_MAXNAMLEN) {
error = EBADRPC;
m_freem(mrep);
goto nfsmout;
}
tlen = nfsm_rndup(len);
if (tlen == len)
tlen += 4; /* To ensure null termination */
left = DIRBLKSIZ - blksiz;
if ((tlen + DIRHDSIZ) > left) {
dp->d_reclen += left;
uiop->uio_iov->iov_base += left;
uiop->uio_iov->iov_len -= left;
uiop->uio_offset += left;
uiop->uio_resid -= left;
blksiz = 0;
}
if ((tlen + DIRHDSIZ) > uiop->uio_resid)
bigenough = 0;
if (bigenough) {
dp = (struct dirent *)uiop->uio_iov->iov_base;
dp->d_fileno = (int)fileno;
dp->d_namlen = len;
dp->d_reclen = tlen + DIRHDSIZ;
dp->d_type = DT_UNKNOWN;
blksiz += dp->d_reclen;
if (blksiz == DIRBLKSIZ)
blksiz = 0;
uiop->uio_offset += DIRHDSIZ;
uiop->uio_resid -= DIRHDSIZ;
uiop->uio_iov->iov_base += DIRHDSIZ;
uiop->uio_iov->iov_len -= DIRHDSIZ;
nfsm_mtouio(uiop, len);
cp = uiop->uio_iov->iov_base;
tlen -= len;
*cp = '\0'; /* null terminate */
uiop->uio_iov->iov_base += tlen;
uiop->uio_iov->iov_len -= tlen;
uiop->uio_offset += tlen;
uiop->uio_resid -= tlen;
} else
nfsm_adv(nfsm_rndup(len));
if (v3) {
nfsm_dissect(tl, u_int32_t *,
3 * NFSX_UNSIGNED);
} else {
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
}
if (bigenough) {
cookie.nfsuquad[0] = *tl++;
if (v3)
cookie.nfsuquad[1] = *tl++;
} else if (v3)
tl += 2;
else
tl++;
more_dirs = fxdr_unsigned(int, *tl);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
}
m_freem(mrep);
}
/*
* Fill last record, iff any, out to a multiple of DIRBLKSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0) {
left = DIRBLKSIZ - blksiz;
dp->d_reclen += left;
uiop->uio_iov->iov_base += left;
uiop->uio_iov->iov_len -= left;
uiop->uio_offset += left;
uiop->uio_resid -= left;
}
/*
* We are now either at the end of the directory or have filled the
* block.
*/
if (bigenough)
dnp->n_direofoffset = uiop->uio_offset;
else {
if (uiop->uio_resid > 0)
printf("EEK! readdirrpc resid > 0\n");
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
*cookiep = cookie;
}
nfsmout:
return (error);
}
/*
* NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
*/
int
nfs_readdirplusrpc(vp, uiop, cred)
struct vnode *vp;
register struct uio *uiop;
struct ucred *cred;
{
register int len, left;
register struct dirent *dp;
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
register struct vnode *newvp;
register nfsuint64 *cookiep;
caddr_t bpos, dpos, cp2, dpossav1, dpossav2;
struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2;
struct nameidata nami, *ndp = &nami;
struct componentname *cnp = &ndp->ni_cnd;
nfsuint64 cookie;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct nfsnode *dnp = VTONFS(vp), *np;
nfsfh_t *fhp;
u_quad_t fileno;
int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
int attrflag, fhsize;
#ifndef nolint
dp = (struct dirent *)0;
#endif
#ifndef DIAGNOSTIC
if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
(uiop->uio_resid & (DIRBLKSIZ - 1)))
panic("nfs readdirplusrpc bad uio");
#endif
ndp->ni_dvp = vp;
newvp = NULLVP;
/*
* If there is no cookie, assume directory was stale.
*/
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
if (cookiep)
cookie = *cookiep;
else
return (NFSERR_BAD_COOKIE);
/*
* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of DIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough) {
nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
NFSX_FH(1) + 6 * NFSX_UNSIGNED);
nfsm_fhtom(vp, 1);
nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
*tl++ = txdr_unsigned(nmp->nm_readdirsize);
*tl = txdr_unsigned(nmp->nm_rsize);
nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_procp, cred);
nfsm_postop_attr(vp, attrflag);
if (error) {
m_freem(mrep);
goto nfsmout;
}
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl++;
more_dirs = fxdr_unsigned(int, *tl);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
fileno = fxdr_hyper(tl);
len = fxdr_unsigned(int, *(tl + 2));
if (len <= 0 || len > NFS_MAXNAMLEN) {
error = EBADRPC;
m_freem(mrep);
goto nfsmout;
}
tlen = nfsm_rndup(len);
if (tlen == len)
tlen += 4; /* To ensure null termination*/
left = DIRBLKSIZ - blksiz;
if ((tlen + DIRHDSIZ) > left) {
dp->d_reclen += left;
uiop->uio_iov->iov_base += left;
uiop->uio_iov->iov_len -= left;
uiop->uio_offset += left;
uiop->uio_resid -= left;
blksiz = 0;
}
if ((tlen + DIRHDSIZ) > uiop->uio_resid)
bigenough = 0;
if (bigenough) {
dp = (struct dirent *)uiop->uio_iov->iov_base;
dp->d_fileno = (int)fileno;
dp->d_namlen = len;
dp->d_reclen = tlen + DIRHDSIZ;
dp->d_type = DT_UNKNOWN;
blksiz += dp->d_reclen;
if (blksiz == DIRBLKSIZ)
blksiz = 0;
uiop->uio_offset += DIRHDSIZ;
uiop->uio_resid -= DIRHDSIZ;
uiop->uio_iov->iov_base += DIRHDSIZ;
uiop->uio_iov->iov_len -= DIRHDSIZ;
cnp->cn_nameptr = uiop->uio_iov->iov_base;
cnp->cn_namelen = len;
nfsm_mtouio(uiop, len);
cp = uiop->uio_iov->iov_base;
tlen -= len;
*cp = '\0';
uiop->uio_iov->iov_base += tlen;
uiop->uio_iov->iov_len -= tlen;
uiop->uio_offset += tlen;
uiop->uio_resid -= tlen;
} else
nfsm_adv(nfsm_rndup(len));
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
if (bigenough) {
cookie.nfsuquad[0] = *tl++;
cookie.nfsuquad[1] = *tl++;
} else
tl += 2;
/*
* Since the attributes are before the file handle
* (sigh), we must skip over the attributes and then
* come back and get them.
*/
attrflag = fxdr_unsigned(int, *tl);
if (attrflag) {
dpossav1 = dpos;
mdsav1 = md;
nfsm_adv(NFSX_V3FATTR);
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
doit = fxdr_unsigned(int, *tl);
if (doit) {
nfsm_getfh(fhp, fhsize, 1);
if (NFS_CMPFH(dnp, fhp, fhsize)) {
VREF(vp);
newvp = vp;
np = dnp;
} else {
error = nfs_nget(vp->v_mount, fhp,
fhsize, &np);
if (error)
doit = 0;
else
newvp = NFSTOV(np);
}
}
if (doit && bigenough) {
dpossav2 = dpos;
dpos = dpossav1;
mdsav2 = md;
md = mdsav1;
nfsm_loadattr(newvp, (struct vattr *)0);
dpos = dpossav2;
md = mdsav2;
dp->d_type =
IFTODT(VTTOIF(np->n_vattr.va_type));
ndp->ni_vp = newvp;
cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
}
} else {
/* Just skip over the file handle */
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
nfsm_adv(nfsm_rndup(i));
}
if (newvp != NULLVP) {
if (newvp == vp)
vrele(newvp);
else
vput(newvp);
newvp = NULLVP;
}
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
}
m_freem(mrep);
}
/*
* Fill last record, iff any, out to a multiple of DIRBLKSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0) {
left = DIRBLKSIZ - blksiz;
dp->d_reclen += left;
uiop->uio_iov->iov_base += left;
uiop->uio_iov->iov_len -= left;
uiop->uio_offset += left;
uiop->uio_resid -= left;
}
/*
* We are now either at the end of the directory or have filled the
* block.
*/
if (bigenough)
dnp->n_direofoffset = uiop->uio_offset;
else {
if (uiop->uio_resid > 0)
printf("EEK! readdirplusrpc resid > 0\n");
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
*cookiep = cookie;
}
nfsmout:
if (newvp != NULLVP) {
if (newvp == vp)
vrele(newvp);
else
vput(newvp);
newvp = NULLVP;
}
return (error);
}
/*
* Silly rename. To make the NFS filesystem that is stateless look a little
* more like the "ufs" a remove of an active vnode is translated to a rename
* to a funny looking filename that is removed by nfs_inactive on the
* nfsnode. There is the potential for another process on a different client
* to create the same funny name between the nfs_lookitup() fails and the
* nfs_rename() completes, but...
*/
static int
nfs_sillyrename(dvp, vp, cnp)
struct vnode *dvp, *vp;
struct componentname *cnp;
{
register struct sillyrename *sp;
struct nfsnode *np;
int error;
short pid;
cache_purge(dvp);
np = VTONFS(vp);
#ifndef DIAGNOSTIC
if (vp->v_type == VDIR)
panic("nfs: sillyrename dir");
#endif
MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
M_NFSREQ, M_WAITOK);
sp->s_cred = crdup(cnp->cn_cred);
sp->s_dvp = dvp;
VREF(dvp);
/* Fudge together a funny name */
pid = cnp->cn_proc->p_pid;
sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid);
/* Try lookitups until we get one that isn't there */
while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_proc, (struct nfsnode **)0) == 0) {
sp->s_name[4]++;
if (sp->s_name[4] > 'z') {
error = EINVAL;
goto bad;
}
}
error = nfs_renameit(dvp, cnp, sp);
if (error)
goto bad;
error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_proc, &np);
np->n_sillyrename = sp;
return (0);
bad:
vrele(sp->s_dvp);
crfree(sp->s_cred);
free((caddr_t)sp, M_NFSREQ);
return (error);
}
/*
* Look up a file name and optionally either update the file handle or
* allocate an nfsnode, depending on the value of npp.
* npp == NULL --> just do the lookup
* *npp == NULL --> allocate a new nfsnode and make sure attributes are
* handled too
* *npp != NULL --> update the file handle in the vnode
*/
static int
nfs_lookitup(dvp, name, len, cred, procp, npp)
register struct vnode *dvp;
const char *name;
int len;
struct ucred *cred;
struct proc *procp;
struct nfsnode **npp;
{
register u_int32_t *tl;
register caddr_t cp;
register int32_t t1, t2;
struct vnode *newvp = (struct vnode *)0;
struct nfsnode *np, *dnp = VTONFS(dvp);
caddr_t bpos, dpos, cp2;
int error = 0, fhlen, attrflag;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
nfsfh_t *nfhp;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
nfsm_reqhead(dvp, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(dvp, v3);
nfsm_strtom(name, len, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_LOOKUP, procp, cred);
if (npp && !error) {
nfsm_getfh(nfhp, fhlen, v3);
if (*npp) {
np = *npp;
if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
free((caddr_t)np->n_fhp, M_NFSBIGFH);
np->n_fhp = &np->n_fh;
} else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK);
bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
np->n_fhsize = fhlen;
newvp = NFSTOV(np);
} else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
VREF(dvp);
newvp = dvp;
} else {
error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
if (error) {
m_freem(mrep);
return (error);
}
newvp = NFSTOV(np);
}
if (v3) {
nfsm_postop_attr(newvp, attrflag);
if (!attrflag && *npp == NULL) {
m_freem(mrep);
if (newvp == dvp)
vrele(newvp);
else
vput(newvp);
return (ENOENT);
}
} else
nfsm_loadattr(newvp, (struct vattr *)0);
}
nfsm_reqdone;
if (npp && *npp == NULL) {
if (error) {
if (newvp) {
if (newvp == dvp)
vrele(newvp);
else
vput(newvp);
}
} else
*npp = np;
}
return (error);
}
/*
* Nfs Version 3 commit rpc
*/
int
nfs_commit(vp, offset, cnt, cred, procp)
struct vnode *vp;
u_quad_t offset;
int cnt;
struct ucred *cred;
struct proc *procp;
{
register caddr_t cp;
register u_int32_t *tl;
register int32_t t1, t2;
register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
caddr_t bpos, dpos, cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0)
return (0);
nfsstats.rpccnt[NFSPROC_COMMIT]++;
nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
nfsm_fhtom(vp, 1);
nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
txdr_hyper(offset, tl);
tl += 2;
*tl = txdr_unsigned(cnt);
nfsm_request(vp, NFSPROC_COMMIT, procp, cred);
nfsm_wcc_data(vp, wccflag);
if (!error) {
nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF);
if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
NFSX_V3WRITEVERF)) {
bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
NFSX_V3WRITEVERF);
error = NFSERR_STALEWRITEVERF;
}
}
nfsm_reqdone;
return (error);
}
/*
* Kludge City..
* - make nfs_bmap() essentially a no-op that does no translation
* - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc
* (Maybe I could use the process's page mapping, but I was concerned that
* Kernel Write might not be enabled and also figured copyout() would do
* a lot more work than bcopy() and also it currently happens in the
* context of the swapper process (2).
*/
static int
nfs_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
if (ap->a_vpp != NULL)
*ap->a_vpp = vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize);
if (ap->a_runp != NULL)
*ap->a_runp = 0;
if (ap->a_runb != NULL)
*ap->a_runb = 0;
return (0);
}
/*
* Strategy routine.
* For async requests when nfsiod(s) are running, queue the request by
* calling nfs_asyncio(), otherwise just all nfs_doio() to do the
* request.
*/
static int
nfs_strategy(ap)
struct vop_strategy_args *ap;
{
register struct buf *bp = ap->a_bp;
struct ucred *cr;
struct proc *p;
int error = 0;
KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp));
if (bp->b_flags & B_PHYS)
panic("nfs physio");
if (bp->b_flags & B_ASYNC)
p = (struct proc *)0;
else
p = curproc; /* XXX */
if (bp->b_iocmd == BIO_READ)
cr = bp->b_rcred;
else
cr = bp->b_wcred;
/*
* If the op is asynchronous and an i/o daemon is waiting
* queue the request, wake it up and wait for completion
* otherwise just do it ourselves.
*/
if ((bp->b_flags & B_ASYNC) == 0 ||
nfs_asyncio(bp, NOCRED, p))
error = nfs_doio(bp, cr, p);
return (error);
}
/*
* Mmap a file
*
* NB Currently unsupported.
*/
/* ARGSUSED */
static int
nfs_mmap(ap)
struct vop_mmap_args /* {
struct vnode *a_vp;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (EINVAL);
}
/*
* fsync vnode op. Just call nfs_flush() with commit == 1.
*/
/* ARGSUSED */
static int
nfs_fsync(ap)
struct vop_fsync_args /* {
struct vnodeop_desc *a_desc;
struct vnode * a_vp;
struct ucred * a_cred;
int a_waitfor;
struct proc * a_p;
} */ *ap;
{
return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_p, 1));
}
/*
* Flush all the blocks associated with a vnode.
* Walk through the buffer pool and push any dirty pages
* associated with the vnode.
*/
static int
nfs_flush(vp, cred, waitfor, p, commit)
register struct vnode *vp;
struct ucred *cred;
int waitfor;
struct proc *p;
int commit;
{
register struct nfsnode *np = VTONFS(vp);
register struct buf *bp;
register int i;
struct buf *nbp;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
int passone = 1;
u_quad_t off, endoff, toff;
struct ucred* wcred = NULL;
struct buf **bvec = NULL;
#ifndef NFS_COMMITBVECSIZ
#define NFS_COMMITBVECSIZ 20
#endif
struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
int bvecsize = 0, bveccount;
if (nmp->nm_flag & NFSMNT_INT)
slpflag = PCATCH;
if (!commit)
passone = 0;
/*
* A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
* server, but nas not been committed to stable storage on the server
* yet. On the first pass, the byte range is worked out and the commit
* rpc is done. On the second pass, nfs_writebp() is called to do the
* job.
*/
again:
off = (u_quad_t)-1;
endoff = 0;
bvecpos = 0;
if (NFS_ISV3(vp) && commit) {
s = splbio();
/*
* Count up how many buffers waiting for a commit.
*/
bveccount = 0;
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
nbp = TAILQ_NEXT(bp, b_vnbufs);
if (BUF_REFCNT(bp) == 0 &&
(bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
== (B_DELWRI | B_NEEDCOMMIT))
bveccount++;
}
/*
* Allocate space to remember the list of bufs to commit. It is
* important to use M_NOWAIT here to avoid a race with nfs_write.
* If we can't get memory (for whatever reason), we will end up
* committing the buffers one-by-one in the loop below.
*/
if (bveccount > NFS_COMMITBVECSIZ) {
if (bvec != NULL && bvec != bvec_on_stack)
free(bvec, M_TEMP);
bvec = (struct buf **)
malloc(bveccount * sizeof(struct buf *),
M_TEMP, M_NOWAIT);
if (bvec == NULL) {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
} else
bvecsize = bveccount;
} else {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
}
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
nbp = TAILQ_NEXT(bp, b_vnbufs);
if (bvecpos >= bvecsize)
break;
if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
(B_DELWRI | B_NEEDCOMMIT) ||
BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
continue;
bremfree(bp);
/*
* Work out if all buffers are using the same cred
* so we can deal with them all with one commit.
*
* NOTE: we are not clearing B_DONE here, so we have
* to do it later on in this routine if we intend to
* initiate I/O on the bp.
*/
if (wcred == NULL)
wcred = bp->b_wcred;
else if (wcred != bp->b_wcred)
wcred = NOCRED;
bp->b_flags |= B_WRITEINPROG;
vfs_busy_pages(bp, 1);
/*
* bp is protected by being locked, but nbp is not
* and vfs_busy_pages() may sleep. We have to
* recalculate nbp.
*/
nbp = TAILQ_NEXT(bp, b_vnbufs);
/*
* A list of these buffers is kept so that the
* second loop knows which buffers have actually
* been committed. This is necessary, since there
* may be a race between the commit rpc and new
* uncommitted writes on the file.
*/
bvec[bvecpos++] = bp;
toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
bp->b_dirtyoff;
if (toff < off)
off = toff;
toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
if (toff > endoff)
endoff = toff;
}
splx(s);
}
if (bvecpos > 0) {
/*
* Commit data on the server, as required.
* If all bufs are using the same wcred, then use that with
* one call for all of them, otherwise commit each one
* separately.
*/
if (wcred != NOCRED)
retv = nfs_commit(vp, off, (int)(endoff - off),
wcred, p);
else {
retv = 0;
for (i = 0; i < bvecpos; i++) {
off_t off, size;
bp = bvec[i];
off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
bp->b_dirtyoff;
size = (u_quad_t)(bp->b_dirtyend
- bp->b_dirtyoff);
retv = nfs_commit(vp, off, (int)size,
bp->b_wcred, p);
if (retv) break;
}
}
if (retv == NFSERR_STALEWRITEVERF)
nfs_clearcommit(vp->v_mount);
/*
* Now, either mark the blocks I/O done or mark the
* blocks dirty, depending on whether the commit
* succeeded.
*/
for (i = 0; i < bvecpos; i++) {
bp = bvec[i];
bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK);
if (retv) {
/*
* Error, leave B_DELWRI intact
*/
vfs_unbusy_pages(bp);
brelse(bp);
} else {
/*
* Success, remove B_DELWRI ( bundirty() ).
*
* b_dirtyoff/b_dirtyend seem to be NFS
* specific. We should probably move that
* into bundirty(). XXX
*/
s = splbio();
vp->v_numoutput++;
bp->b_flags |= B_ASYNC;
bundirty(bp);
bp->b_flags &= ~B_DONE;
bp->b_ioflags &= ~BIO_ERROR;
bp->b_dirtyoff = bp->b_dirtyend = 0;
splx(s);
bufdone(bp);
}
}
}
/*
* Start/do any write(s) that are required.
*/
loop:
s = splbio();
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
nbp = TAILQ_NEXT(bp, b_vnbufs);
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
if (waitfor != MNT_WAIT || passone)
continue;
error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL,
"nfsfsync", slpflag, slptimeo);
splx(s);
if (error == 0)
panic("nfs_fsync: inconsistent lock");
if (error == ENOLCK)
goto loop;
if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
error = EINTR;
goto done;
}
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
goto loop;
}
if ((bp->b_flags & B_DELWRI) == 0)
panic("nfs_fsync: not dirty");
if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
BUF_UNLOCK(bp);
continue;
}
bremfree(bp);
if (passone || !commit)
bp->b_flags |= B_ASYNC;
else
bp->b_flags |= B_ASYNC | B_WRITEINPROG;
splx(s);
BUF_WRITE(bp);
goto loop;
}
splx(s);
if (passone) {
passone = 0;
goto again;
}
if (waitfor == MNT_WAIT) {
while (vp->v_numoutput) {
vp->v_flag |= VBWAIT;
error = tsleep((caddr_t)&vp->v_numoutput,
slpflag | (PRIBIO + 1), "nfsfsync", slptimeo);
if (error) {
if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
error = EINTR;
goto done;
}
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
}
}
if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) {
goto loop;
}
}
if (np->n_flag & NWRITEERR) {
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
done:
if (bvec != NULL && bvec != bvec_on_stack)
free(bvec, M_TEMP);
return (error);
}
/*
* NFS advisory byte-level locks.
* Currently unsupported.
*/
static int
nfs_advlock(ap)
struct vop_advlock_args /* {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap;
{
register struct nfsnode *np = VTONFS(ap->a_vp);
/*
* The following kludge is to allow diskless support to work
* until a real NFS lockd is implemented. Basically, just pretend
* that this is a local lock.
*/
return (lf_advlock(ap, &(np->n_lockf), np->n_size));
}
/*
* Print out the contents of an nfsnode.
*/
static int
nfs_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct nfsnode *np = VTONFS(vp);
printf("tag VT_NFS, fileid %ld fsid 0x%x",
np->n_vattr.va_fileid, np->n_vattr.va_fsid);
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
printf("\n");
return (0);
}
/*
* Just call nfs_writebp() with the force argument set to 1.
*
* NOTE: B_DONE may or may not be set in a_bp on call.
*/
static int
nfs_bwrite(ap)
struct vop_bwrite_args /* {
struct vnode *a_bp;
} */ *ap;
{
return (nfs_writebp(ap->a_bp, 1, curproc));
}
/*
* This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless
* the force flag is one and it also handles the B_NEEDCOMMIT flag. We set
* B_CACHE if this is a VMIO buffer.
*/
int
nfs_writebp(bp, force, procp)
register struct buf *bp;
int force;
struct proc *procp;
{
int s;
int oldflags = bp->b_flags;
#if 0
int retv = 1;
off_t off;
#endif
if (BUF_REFCNT(bp) == 0)
panic("bwrite: buffer is not locked???");
if (bp->b_flags & B_INVAL) {
brelse(bp);
return(0);
}
bp->b_flags |= B_CACHE;
/*
* Undirty the bp. We will redirty it later if the I/O fails.
*/
s = splbio();
bundirty(bp);
bp->b_flags &= ~B_DONE;
bp->b_ioflags &= ~BIO_ERROR;
bp->b_iocmd = BIO_WRITE;
bp->b_vp->v_numoutput++;
curproc->p_stats->p_ru.ru_oublock++;
splx(s);
vfs_busy_pages(bp, 1);
if (force)
bp->b_flags |= B_WRITEINPROG;
BUF_KERNPROC(bp);
BUF_STRATEGY(bp);
if( (oldflags & B_ASYNC) == 0) {
int rtval = bufwait(bp);
if (oldflags & B_DELWRI) {
s = splbio();
reassignbuf(bp, bp->b_vp);
splx(s);
}
brelse(bp);
return (rtval);
}
return (0);
}
/*
* nfs special file access vnode op.
* Essentially just get vattr and then imitate iaccess() since the device is
* local to the client.
*/
static int
nfsspec_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vattr *vap;
register gid_t *gp;
register struct ucred *cred = ap->a_cred;
struct vnode *vp = ap->a_vp;
mode_t mode = ap->a_mode;
struct vattr vattr;
register int i;
int error;
/*
* Disallow write attempts on filesystems mounted read-only;
* unless the file is a socket, fifo, or a block or character
* device resident on the filesystem.
*/
if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}
/*
* If you're the super-user,
* you always get access.
*/
if (cred->cr_uid == 0)
return (0);
vap = &vattr;
error = VOP_GETATTR(vp, vap, cred, ap->a_p);
if (error)
return (error);
/*
* Access check is based on only one of owner, group, public.
* If not owner, then check group. If not a member of the
* group, then check public access.
*/
if (cred->cr_uid != vap->va_uid) {
mode >>= 3;
gp = cred->cr_groups;
for (i = 0; i < cred->cr_ngroups; i++, gp++)
if (vap->va_gid == *gp)
goto found;
mode >>= 3;
found:
;
}
error = (vap->va_mode & mode) == mode ? 0 : EACCES;
return (error);
}
/*
* Read wrapper for special devices.
*/
static int
nfsspec_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set access flag.
*/
np->n_flag |= NACC;
getnanotime(&np->n_atim);
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for special devices.
*/
static int
nfsspec_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set update flag.
*/
np->n_flag |= NUPD;
getnanotime(&np->n_mtim);
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for special devices.
*
* Update the times on the nfsnode then do device close.
*/
static int
nfsspec_close(ap)
struct vop_close_args /* {
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);
struct vattr vattr;
if (np->n_flag & (NACC | NUPD)) {
np->n_flag |= NCHG;
if (vp->v_usecount == 1 &&
(vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
VATTR_NULL(&vattr);
if (np->n_flag & NACC)
vattr.va_atime = np->n_atim;
if (np->n_flag & NUPD)
vattr.va_mtime = np->n_mtim;
(void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
}
}
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap));
}
/*
* Read wrapper for fifos.
*/
static int
nfsfifo_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set access flag.
*/
np->n_flag |= NACC;
getnanotime(&np->n_atim);
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for fifos.
*/
static int
nfsfifo_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set update flag.
*/
np->n_flag |= NUPD;
getnanotime(&np->n_mtim);
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for fifos.
*
* Update the times on the nfsnode then do fifo close.
*/
static int
nfsfifo_close(ap)
struct vop_close_args /* {
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);
struct vattr vattr;
struct timespec ts;
if (np->n_flag & (NACC | NUPD)) {
getnanotime(&ts);
if (np->n_flag & NACC)
np->n_atim = ts;
if (np->n_flag & NUPD)
np->n_mtim = ts;
np->n_flag |= NCHG;
if (vp->v_usecount == 1 &&
(vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
VATTR_NULL(&vattr);
if (np->n_flag & NACC)
vattr.va_atime = np->n_atim;
if (np->n_flag & NUPD)
vattr.va_mtime = np->n_mtim;
(void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p);
}
}
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap));
}
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