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px4-firmware/nuttx/fs/nfs/nfs_vnops.c

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/****************************************************************************
* fs/nfs/nfs_vfmops.c
* vnode op calls for Sun NFS version 2 and 3
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2012 Jose Pablo Rojas Vargas. All rights reserved.
* Author: Jose Pablo Rojas Vargas <jrojas@nx-engineering.com>
*
* Leveraged from OpenBSD:
*
* 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. 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/mbuf.h>
#include <sys/conf.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>
#include <sys/hash.h>
#include <sys/queue.h>
#include <nuttx/fs/fs.h>
#include "rpc_v2.h"
#include "nfs_proto.h"
#include "nfs.h"
#include <nfs/nfsnode.h>
#include "nfs_mount.h"
#include "xdr_subs.h"
//#include <nfs/nfsm_subs.h>
//#include <nfs/nfs_var.h>
#include <net/if.h>
#include <netinet/in.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/* Global vfs data structures for nfs.
struct vops nfs_vops =
{
.vop_create = nfs_create,
.vop_open = nfs_open,
.vop_close = nfs_close,
.vop_getattr = nfs_getattr,
.vop_setattr = nfs_setattr,
.vop_read = nfs_read,
.vop_write = nfs_write,
.vop_ioctl = nfs_ioctl,
//.vop_poll = nfs_poll,
.vop_fsync = nfs_fsync,
.vop_remove = nfs_remove,
.vop_rename = nfs_rename,
.vop_mkdir = nfs_mkdir,
.vop_rmdir = nfs_rmdir,
.vop_readdir = nfs_readdir,
.vop_print = nfs_print,
};
*/
const struct mountpt_operations nfs_operations =
{
nfs_open, /* open */
nfs_close, /* close */
nfs_read, /* read */
nfs_write, /* write */
NULL, /* seek */
nfs_ioctl, /* ioctl */
nfs_sync, /* sync */
NULL, /* opendir */
NULL, /* closedir */
nfs_readdir, /* readdir */
NULL, /* rewinddir */
NULL, /* bind */
NULL, /* unbind */
NULL, /* statfs */
nfs_remove, /* unlink */
nfs_mkdir, /* mkdir */
nfs_rmdir, /* rmdir */
nfs_rename, /* rename */
nfs_print /* stat */
};
int nfs_numasync = 0;
/****************************************************************************
* External Public Data (this belongs in a header file)
****************************************************************************/
/* Global variables */
extern uint32_t nfs_true, nfs_false;
extern uint32_t nfs_xdrneg1;
extern struct nfsstats nfsstats;
extern nfstype nfsv3_type[9];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/* nfs null call from vfs. */
int nfs_null(FAR struct file *filep)
{
int error = 0;
struct nfsmount *nm nm = VFSTONFS(filep->f_inode);
error = nfs_request(nm, NFSPROC_NULL);
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.
*/
int
nfs_open(FAR struct file *filp, FAR const char *relpath,
int oflags, mode_t mode)
{
struct vop_open_args *ap = v;
struct inode *inode;
struct nfsnode *np = VTONFS(filp);
//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);
}
/* Initialize read and write creds here, for swapfiles
* and other paths that don't set the creds themselves.
*/
if (np->n_flag & NMODIFIED)
{
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
if (error == EINTR)
return (error);
uvm_vnp_uncache(vp);
NFS_INVALIDATE_ATTRCACHE(np);
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;
}
else
{
error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p);
if (error)
return (error);
if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=))
{
if (vp->v_type == VDIR)
np->n_direofoffset = 0;
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
if (error == EINTR)
return (error);
uvm_vnp_uncache(vp);
np->n_mtime = vattr.va_mtime;
}
}
/* For open/close consistency. */
NFS_INVALIDATE_ATTRCACHE(np);
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.
*/
int
nfs_close(FAR struct file *filep, const char *relpath, int oflags, mode_t mode)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
if (vp->v_type == VREG)
{
if (np->n_flag & NMODIFIED)
{
if (NFS_ISV3(vp))
{
error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, 0);
np->n_flag &= ~NMODIFIED;
}
else
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
NFS_INVALIDATE_ATTRCACHE(np);
}
if (np->n_flag & NWRITEERR)
{
np->n_flag &= ~NWRITEERR;
error = np->n_error;
}
}
return (error);
}
/* nfs getattr call from vfs. */
int nfs_getattr(void *v)
{
struct vop_getattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct nfsm_info info;
int32_t t1;
int error = 0;
info.nmi_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);
nfsstats.rpccnt[NFSPROC_GETATTR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3));
nfsm_fhtom(&info, vp, info.nmi_v3);
info.nmi_procp = ap->a_p;
info.nmi_cred = ap->a_cred;
error = nfs_request(vp, NFSPROC_GETATTR, &info);
if (!error)
nfsm_loadattr(vp, ap->a_vap);
m_freem(info.nmi_mrep);
nfsmout:
return (error);
}
/* nfs setattr call. */
int nfs_setattr(void *v)
{
struct vop_setattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct vattr *vap = ap->a_vap;
int hint = NOTE_ATTRIB;
int error = 0;
u_quad_t tsize = 0;
/* 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_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);
if (vap->va_size == 0)
error = nfs_vinvalbuf(vp, 0, ap->a_cred, ap->a_p);
else
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p);
if (error)
return (error);
tsize = np->n_size;
np->n_size = np->n_vattr.va_size = vap->va_size;
uvm_vnp_setsize(vp, np->n_size);
};
}
else if ((vap->va_mtime.tv_sec != VNOVAL ||
vap->va_atime.tv_sec != VNOVAL) &&
vp->v_type == VREG &&
(error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p)) == 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;
uvm_vnp_setsize(vp, np->n_size);
}
if (vap->va_size != VNOVAL && vap->va_size < tsize)
hint |= NOTE_TRUNCATE;
VN_KNOTE(vp, hint); /* XXX setattrrpc? */
return (error);
}
/* Do an nfs setattr rpc. */
int
nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
struct proc *procp)
{
struct nfsv2_sattr *sp;
struct nfsm_info info;
int32_t t1;
caddr_t cp2;
u_int32_t *tl;
int error = 0, wccflag = NFSV3_WCCRATTR;
int v3 = NFS_ISV3(vp);
info.nmi_v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_SETATTR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(v3) + NFSX_SATTR(v3));
nfsm_fhtom(&info, vp, v3);
if (info.nmi_v3)
{
nfsm_v3attrbuild(&info.nmi_mb, vap, 1);
tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
*tl = nfs_false;
}
else
{
sp = nfsm_build(&info.nmi_mb, 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);
}
info.nmi_procp = procp;
info.nmi_cred = cred;
error = nfs_request(vp, NFSPROC_SETATTR, &info);
if (info.nmi_v3)
nfsm_wcc_data(vp, wccflag);
else if (error == 0)
nfsm_loadattr(vp, NULL);
m_freem(info.nmi_mrep);
nfsmout:
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
*/
int nfs_lookup(void *v)
{
struct vop_lookup_args *ap = v;
struct componentname *cnp = ap->a_cnp;
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct proc *p = cnp->cn_proc;
struct nfsm_info info;
int flags;
struct vnode *newvp;
u_int32_t *tl;
int32_t t1;
struct nfsmount *nmp;
caddr_t cp2;
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int lockparent, wantparent, error = 0, attrflag, fhsize;
info.nmi_v3 = NFS_ISV3(dvp);
cnp->cn_flags &= ~PDIRUNLOCK;
flags = cnp->cn_flags;
*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);
/* Before tediously performing a linear scan of the directory,
* check the name cache to see if the directory/name pair
* we are looking for is known already.
* If the directory/name pair is found in the name cache,
* we have to ensure the directory has not changed from
* the time the cache entry has been created. If it has,
* the cache entry has to be ignored.
*/
if ((error = cache_lookup(dvp, vpp, cnp)) >= 0)
{
struct vattr vattr;
int err2;
if (error && error != ENOENT)
{
*vpp = NULLVP;
return (error);
}
if (cnp->cn_flags & PDIRUNLOCK)
{
err2 = vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p);
if (err2 != 0)
{
*vpp = NULLVP;
return (err2);
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_proc);
if (err2 != 0)
{
if (error == 0)
{
if (*vpp != dvp)
vput(*vpp);
else
vrele(*vpp);
}
*vpp = NULLVP;
return (err2);
}
if (error == ENOENT)
{
if (!VOP_GETATTR(dvp, &vattr, cnp->cn_cred,
cnp->cn_proc) && vattr.va_mtime.tv_sec ==
VTONFS(dvp)->n_ctime)
return (ENOENT);
cache_purge(dvp);
np->n_ctime = 0;
goto dorpc;
}
newvp = *vpp;
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, cnp->cn_proc)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime)
{
nfsstats.lookupcache_hits++;
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
if ((!lockparent || !(flags & ISLASTCN)) && newvp != dvp)
VOP_UNLOCK(dvp, 0, p);
return (0);
}
cache_purge(newvp);
if (newvp != dvp)
vput(newvp);
else
vrele(newvp);
*vpp = NULLVP;
}
dorpc:
error = 0;
newvp = NULLVP;
nfsstats.lookupcache_misses++;
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
len = cnp->cn_namelen;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_LOOKUP, &info);
if (error)
{
if (info.nmi_v3)
nfsm_postop_attr(dvp, attrflag);
m_freem(info.nmi_mrep);
goto nfsmout;
}
nfsm_getfh(fhp, fhsize, info.nmi_v3);
/* Handle RENAME case... */
if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN))
{
if (NFS_CMPFH(np, fhp, fhsize))
{
m_freem(info.nmi_mrep);
return (EISDIR);
}
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
{
m_freem(info.nmi_mrep);
return (error);
}
newvp = NFSTOV(np);
if (info.nmi_v3)
{
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
}
else
nfsm_loadattr(newvp, NULL);
*vpp = newvp;
m_freem(info.nmi_mrep);
cnp->cn_flags |= SAVENAME;
if (!lockparent)
{
VOP_UNLOCK(dvp, 0, p);
cnp->cn_flags |= PDIRUNLOCK;
}
return (0);
}
/* The postop attr handling is duplicated for each if case,
* because it should be done while dvp is locked (unlocking
* dvp is different for each case).
*/
if (NFS_CMPFH(np, fhp, fhsize))
{
vref(dvp);
newvp = dvp;
if (info.nmi_v3)
{
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
}
else
nfsm_loadattr(newvp, NULL);
}
else if (flags & ISDOTDOT)
{
VOP_UNLOCK(dvp, 0, p);
cnp->cn_flags |= PDIRUNLOCK;
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
{
if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p) == 0)
cnp->cn_flags &= ~PDIRUNLOCK;
m_freem(info.nmi_mrep);
return (error);
}
newvp = NFSTOV(np);
if (info.nmi_v3)
{
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
}
else
nfsm_loadattr(newvp, NULL);
if (lockparent && (flags & ISLASTCN))
{
if ((error = vn_lock(dvp, LK_EXCLUSIVE, p)))
{
m_freem(info.nmi_mrep);
vput(newvp);
return error;
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
}
else
{
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
{
m_freem(info.nmi_mrep);
return error;
}
newvp = NFSTOV(np);
if (info.nmi_v3)
{
nfsm_postop_attr(newvp, attrflag);
nfsm_postop_attr(dvp, attrflag);
}
else
nfsm_loadattr(newvp, NULL);
if (!lockparent || !(flags & ISLASTCN))
{
VOP_UNLOCK(dvp, 0, p);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
if ((cnp->cn_flags & MAKEENTRY) &&
(cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)))
{
nfs_cache_enter(dvp, newvp, cnp);
}
*vpp = newvp;
m_freem(info.nmi_mrep);
nfsmout:
if (error)
{
/* We get here only because of errors returned by
* the RPC. Otherwise we'll have returned above
* (the nfsm_* macros will jump to nfsmout
* on error).
*/
if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) &&
cnp->cn_nameiop != CREATE)
{
nfs_cache_enter(dvp, NULL, cnp);
}
if (newvp != NULLVP)
{
vrele(newvp);
if (newvp != dvp)
VOP_UNLOCK(newvp, 0, p);
}
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT)
{
if (dvp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else
error = EJUSTRETURN;
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
*vpp = NULL;
}
return (error);
}
/* nfs read call.
* Just call nfs_bioread() to do the work.
*/
int nfs_read(void *v)
{
struct vop_read_args *ap = v;
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 */
int nfs_readlink(void *v)
{
struct vop_readlink_args *ap = v;
struct vnode *vp = ap->a_vp;
if (vp->v_type != VLNK)
return (EPERM);
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(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, len, attrflag;
info.nmi_v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_READLINK]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3));
nfsm_fhtom(&info, vp, info.nmi_v3);
info.nmi_procp = curproc;
info.nmi_cred = cred;
error = nfs_request(vp, NFSPROC_READLINK, &info);
if (info.nmi_v3)
nfsm_postop_attr(vp, attrflag);
if (!error)
{
nfsm_strsiz(len, NFS_MAXPATHLEN);
nfsm_mtouio(uiop, len);
}
m_freem(info.nmi_mrep);
nfsmout:
return (error);
}
/*nfs read rpc call
* Ditto above
*/
int nfs_readrpc(struct vnode *vp, struct uio *uiop)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
struct nfsmount *nmp;
int error = 0, len, retlen, tsiz, eof, attrflag;
info.nmi_v3 = NFS_ISV3(vp);
eof = 0;
nmp = VFSTONFS(vp->v_mount);
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > 0xffffffff && !info.nmi_v3)
return (EFBIG);
while (tsiz > 0)
{
nfsstats.rpccnt[NFSPROC_READ]++;
len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED * 3);
nfsm_fhtom(&info, vp, info.nmi_v3);
tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED * 3);
if (info.nmi_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;
}
info.nmi_procp = curproc;
info.nmi_cred = VTONFS(vp)->n_rcred;
error = nfs_request(vp, NFSPROC_READ, &info);
if (info.nmi_v3)
nfsm_postop_attr(vp, attrflag);
if (error)
{
m_freem(info.nmi_mrep);
goto nfsmout;
}
if (info.nmi_v3)
{
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
eof = fxdr_unsigned(int, *(tl + 1));
}
else
{
nfsm_loadattr(vp, NULL);
}
nfsm_strsiz(retlen, nmp->nm_rsize);
nfsm_mtouio(uiop, retlen);
m_freem(info.nmi_mrep);
tsiz -= retlen;
if (info.nmi_v3)
{
if (eof || retlen == 0)
tsiz = 0;
}
else if (retlen < len)
tsiz = 0;
}
nfsmout:
return (error);
}
/* nfs write call */
int
nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1, backup;
caddr_t cp2;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
int committed = NFSV3WRITE_FILESYNC;
info.nmi_v3 = NFS_ISV3(vp);
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfs: writerpc iovcnt > 1");
#endif
*must_commit = 0;
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > 0xffffffff && !info.nmi_v3)
return (EFBIG);
while (tsiz > 0)
{
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)
+ 5 * NFSX_UNSIGNED +
nfsm_rndup(len));
nfsm_fhtom(&info, vp, info.nmi_v3);
if (info.nmi_v3)
{
tl = nfsm_build(&info.nmi_mb, 5 * NFSX_UNSIGNED);
txdr_hyper(uiop->uio_offset, tl);
tl += 2;
*tl++ = txdr_unsigned(len);
*tl++ = txdr_unsigned(*iomode);
*tl = txdr_unsigned(len);
}
else
{
u_int32_t x;
tl = nfsm_build(&info.nmi_mb, 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_uiotombuf(&info.nmi_mb, uiop, len);
info.nmi_procp = curproc;
info.nmi_cred = VTONFS(vp)->n_wcred;
error = nfs_request(vp, NFSPROC_WRITE, &info);
if (info.nmi_v3)
{
wccflag = NFSV3_WCCCHK;
nfsm_wcc_data(vp, wccflag);
}
if (error)
{
m_freem(info.nmi_mrep);
goto nfsmout;
}
if (info.nmi_v3)
{
wccflag = NFSV3_WCCCHK;
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF);
rlen = fxdr_unsigned(int, *tl++);
if (rlen == 0)
{
error = NFSERR_IO;
break;
}
else if (rlen < len)
{
backup = len - rlen;
uiop->uio_iov->iov_base =
(char *)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_flag & NFSMNT_HASWRITEVERF) == 0)
{
bcopy((caddr_t) tl, (caddr_t) nmp->nm_verf, NFSX_V3WRITEVERF);
nmp->nm_flag |= NFSMNT_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, NULL);
}
if (wccflag)
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
m_freem(info.nmi_mrep);
tsiz -= len;
}
nfsmout:
*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.
*/
int
nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
struct vattr *vap)
{
struct nfsv2_sattr *sp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
struct vnode *newvp = NULL;
struct nfsnode *np = NULL;
char *cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
u_int32_t rdev;
info.nmi_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
{
VOP_ABORTOP(dvp, cnp);
vput(dvp);
return (EOPNOTSUPP);
}
nfsstats.rpccnt[NFSPROC_MKNOD]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
4 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) +
NFSX_SATTR(info.nmi_v3));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (info.nmi_v3)
{
tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
*tl++ = vtonfsv3_type(vap->va_type);
nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
if (vap->va_type == VCHR || vap->va_type == VBLK)
{
tl = nfsm_build(&info.nmi_mb, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(major(vap->va_rdev));
*tl = txdr_unsigned(minor(vap->va_rdev));
}
}
else
{
sp = nfsm_build(&info.nmi_mb, 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);
}
KASSERT(cnp->cn_proc == curproc);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_MKNOD, &info);
if (!error)
{
nfsm_mtofh(dvp, newvp, info.nmi_v3, gotvp);
if (!gotvp)
{
if (newvp)
{
vrele(newvp);
newvp = NULL;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc,
&np);
if (!error)
newvp = NFSTOV(np);
}
}
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
if (error)
{
if (newvp)
vrele(newvp);
}
else
{
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
*vpp = newvp;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
vrele(dvp);
return (error);
}
/* nfs mknod vop
* just call nfs_mknodrpc() to do the work.
*/
int nfs_mknod(void *v)
{
struct vop_mknod_args *ap = v;
struct vnode *newvp;
int error;
error = nfs_mknodrpc(ap->a_dvp, &newvp, ap->a_cnp, ap->a_vap);
if (!error)
vrele(newvp);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
return (error);
}
int nfs_create(void *v)
{
struct vop_create_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
struct nfsnode *np = NULL;
struct vnode *newvp = NULL;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
info.nmi_v3 = NFS_ISV3(dvp);
/*
* Oops, not for me..
*/
if (vap->va_type == VSOCK)
return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
if (vap->va_vaflags & VA_EXCLUSIVE)
fmode |= O_EXCL;
again:
nfsstats.rpccnt[NFSPROC_CREATE]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
2 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) +
NFSX_SATTR(info.nmi_v3));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (info.nmi_v3)
{
tl = nfsm_build(&info.nmi_mb, NFSX_UNSIGNED);
if (fmode & O_EXCL)
{
*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
tl = nfsm_build(&info.nmi_mb, NFSX_V3CREATEVERF);
*tl++ = arc4random();
*tl = arc4random();
}
else
{
*tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
}
}
else
{
sp = nfsm_build(&info.nmi_mb, 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);
}
KASSERT(cnp->cn_proc == curproc);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_CREATE, &info);
if (!error)
{
nfsm_mtofh(dvp, newvp, info.nmi_v3, gotvp);
if (!gotvp)
{
if (newvp)
{
vrele(newvp);
newvp = NULL;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc,
&np);
if (!error)
newvp = NFSTOV(np);
}
}
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
if (error)
{
if (info.nmi_v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP)
{
fmode &= ~O_EXCL;
goto again;
}
if (newvp)
vrele(newvp);
}
else if (info.nmi_v3 && (fmode & O_EXCL))
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc);
if (!error)
{
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
vrele(dvp);
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
*/
int nfs_remove(void *v)
{
struct vop_remove_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
struct vattr vattr;
#ifdef 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);
/* 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);
pool_put(&namei_pool, cnp->cn_pnbuf);
NFS_INVALIDATE_ATTRCACHE(np);
vrele(dvp);
vrele(vp);
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
return (error);
}
/* nfs file remove rpc called from nfs_inactive */
int nfs_removeit(struct sillyrename *sp)
{
/* Make sure that the directory vnode is still valid.
* XXX we should lock sp->s_dvp here.
*
* NFS can potentially try to nuke a silly *after* the directory
* has already been pushed out on a forced unmount. Since the silly
* is going to go away anyway, this is fine.
*/
if (sp->s_dvp->v_type == VBAD)
return (0);
return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, NULL));
}
/* Nfs remove rpc, called from nfs_remove() and nfs_removeit(). */
int
nfs_removerpc(struct vnode *dvp, char *name, int namelen, struct ucred *cred,
struct proc *proc)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_REMOVE]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED +
nfsm_rndup(namelen));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
info.nmi_procp = proc;
info.nmi_cred = cred;
error = nfs_request(dvp, NFSPROC_REMOVE, &info);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
return (error);
}
/* nfs file rename call */
int nfs_rename(void *v)
{
struct vop_rename_args *ap = v;
struct vnode *fvp = ap->a_fvp;
struct vnode *tvp = ap->a_tvp;
struct vnode *fdvp = ap->a_fdvp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
int error;
#ifdef 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;
}
/* If the tvp exists and is in use, sillyrename it before doing the
* rename of the new file over it.
*/
if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp))
{
VN_KNOTE(tvp, NOTE_DELETE);
vrele(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);
VN_KNOTE(fdvp, NOTE_WRITE);
VN_KNOTE(tdvp, NOTE_WRITE);
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 */
int
nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
struct sillyrename *sp)
{
return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred,
curproc));
}
/* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). */
int
nfs_renamerpc(struct vnode *fdvp, char *fnameptr, int fnamelen,
struct vnode *tdvp, char *tnameptr, int tnamelen,
struct ucred *cred, struct proc *proc)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(fdvp);
nfsstats.rpccnt[NFSPROC_RENAME]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead((NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED) * 2 +
nfsm_rndup(fnamelen) +
nfsm_rndup(tnamelen));
nfsm_fhtom(&info, fdvp, info.nmi_v3);
nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
nfsm_fhtom(&info, tdvp, info.nmi_v3);
nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
info.nmi_procp = proc;
info.nmi_cred = cred;
error = nfs_request(fdvp, NFSPROC_RENAME, &info);
if (info.nmi_v3)
{
nfsm_wcc_data(fdvp, fwccflag);
nfsm_wcc_data(tdvp, twccflag);
}
m_freem(info.nmi_mrep);
nfsmout:
VTONFS(fdvp)->n_flag |= NMODIFIED;
VTONFS(tdvp)->n_flag |= NMODIFIED;
if (!fwccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp));
if (!twccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp));
return (error);
}
/* nfs hard link create call */
int nfs_link(void *v)
{
struct vop_link_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
info.nmi_v3 = NFS_ISV3(vp);
if (dvp->v_mount != vp->v_mount)
{
pool_put(&namei_pool, cnp->cn_pnbuf);
if (vp == dvp)
vrele(dvp);
else
vput(dvp);
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);
nfsstats.rpccnt[NFSPROC_LINK]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(2 * NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(&info, vp, info.nmi_v3);
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(vp, NFSPROC_LINK, &info);
if (info.nmi_v3)
{
nfsm_postop_attr(vp, attrflag);
nfsm_wcc_data(dvp, wccflag);
}
m_freem(info.nmi_mrep);
nfsmout:
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!attrflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(vp));
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(vp, NOTE_LINK);
VN_KNOTE(dvp, NOTE_WRITE);
vput(dvp);
return (error);
}
/* nfs symbolic link create call */
int nfs_symlink(void *v)
{
struct vop_symlink_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
struct vnode *newvp = NULL;
info.nmi_v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
slen = strlen(ap->a_target);
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
2 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) +
nfsm_rndup(slen) +
NFSX_SATTR(info.nmi_v3));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (info.nmi_v3)
nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
if (!info.nmi_v3)
{
sp = nfsm_build(&info.nmi_mb, 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);
}
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_SYMLINK, &info);
if (info.nmi_v3)
{
if (!error)
nfsm_mtofh(dvp, newvp, info.nmi_v3, gotvp);
nfsm_wcc_data(dvp, wccflag);
}
m_freem(info.nmi_mrep);
nfsmout:
if (newvp)
vrele(newvp);
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(dvp, NOTE_WRITE);
vrele(dvp);
return (error);
}
/* nfs make dir call */
int nfs_mkdir(void *v)
{
struct vop_mkdir_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
int len;
struct nfsnode *np = NULL;
struct vnode *newvp = NULL;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
int gotvp = 0;
info.nmi_v3 = NFS_ISV3(dvp);
len = cnp->cn_namelen;
nfsstats.rpccnt[NFSPROC_MKDIR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED + nfsm_rndup(len) +
NFSX_SATTR(info.nmi_v3));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
if (info.nmi_v3)
{
nfsm_v3attrbuild(&info.nmi_mb, vap, 0);
}
else
{
sp = nfsm_build(&info.nmi_mb, 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);
}
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_MKDIR, &info);
if (!error)
nfsm_mtofh(dvp, newvp, info.nmi_v3, gotvp);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
if (error == 0 && newvp == NULL)
{
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
{
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
vrele(dvp);
return (error);
}
/* nfs remove directory call */
int nfs_rmdir(void *v)
{
struct vop_rmdir_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
info.nmi_v3 = NFS_ISV3(dvp);
if (dvp == vp)
{
vrele(dvp);
vrele(dvp);
pool_put(&namei_pool, cnp->cn_pnbuf);
return (EINVAL);
}
nfsstats.rpccnt[NFSPROC_RMDIR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3) +
NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
info.nmi_procp = cnp->cn_proc;
info.nmi_cred = cnp->cn_cred;
error = nfs_request(dvp, NFSPROC_RMDIR, &info);
if (info.nmi_v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(info.nmi_mrep);
nfsmout:
pool_put(&namei_pool, cnp->cn_pnbuf);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
VN_KNOTE(vp, NOTE_DELETE);
cache_purge(vp);
vrele(vp);
vrele(dvp);
/* Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. */
if (error == ENOENT)
error = 0;
return (error);
}
/* The readdir logic below has a big design bug. It stores the NFS cookie in
* the returned uio->uio_offset but does not store the verifier (it cannot).
* Instead, the code stores the verifier in the nfsnode and applies that
* verifies to all cookies, no matter what verifier was originally with
* the cookie.
*
* From a practical standpoint, this is not a problem since almost all
* NFS servers do not change the validity of cookies across deletes
* and inserts.
*/
struct nfs_dirent
{
u_int32_t cookie[2];
struct dirent dirent;
};
#define NFS_DIRHDSIZ (sizeof (struct nfs_dirent) - (MAXNAMLEN + 1))
#define NFS_DIRENT_OVERHEAD offsetof(struct nfs_dirent, dirent)
/* nfs readdir call */
int nfs_readdir(void *v)
{
struct vop_readdir_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct uio *uio = ap->a_uio;
int tresid, error = 0;
struct vattr vattr;
u_long *cookies = NULL;
int ncookies = 0, cnt;
u_int64_t newoff = uio->uio_offset;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct uio readdir_uio;
struct iovec readdir_iovec;
struct proc *p = uio->uio_procp;
int done = 0, eof = 0;
struct ucred *cred = ap->a_cred;
void *data;
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)
{
if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_procp) == 0 &&
timespeccmp(&np->n_mtime, &vattr.va_mtime, ==))
{
nfsstats.direofcache_hits++;
*ap->a_eofflag = 1;
return (0);
}
}
if (uio->uio_resid < NFS_FABLKSIZE)
return (EINVAL);
tresid = uio->uio_resid;
if (uio->uio_rw != UIO_READ)
return (EINVAL);
if (ap->a_cookies)
{
ncookies = uio->uio_resid / 20;
cookies = malloc(sizeof(*cookies) * ncookies, M_TEMP, M_WAITOK);
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
}
if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3)
(void)nfs_fsinfo(nmp, vp, cred, p);
cnt = 5;
data = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
do
{
struct nfs_dirent *ndp = data;
readdir_iovec.iov_len = NFS_DIRBLKSIZ;
readdir_iovec.iov_base = data;
readdir_uio.uio_offset = newoff;
readdir_uio.uio_iov = &readdir_iovec;
readdir_uio.uio_iovcnt = 1;
readdir_uio.uio_segflg = UIO_SYSSPACE;
readdir_uio.uio_rw = UIO_READ;
readdir_uio.uio_resid = NFS_DIRBLKSIZ;
readdir_uio.uio_procp = curproc;
if (nmp->nm_flag & NFSMNT_RDIRPLUS)
{
error = nfs_readdirplusrpc(vp, &readdir_uio, cred, &eof);
if (error == NFSERR_NOTSUPP)
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
}
if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
error = nfs_readdirrpc(vp, &readdir_uio, cred, &eof);
if (error == NFSERR_BAD_COOKIE)
error = EINVAL;
while (error == 0 &&
(ap->a_cookies == NULL || ncookies != 0) &&
ndp < (struct nfs_dirent *)readdir_iovec.iov_base)
{
struct dirent *dp = &ndp->dirent;
int reclen = dp->d_reclen;
dp->d_reclen -= NFS_DIRENT_OVERHEAD;
if (uio->uio_resid < dp->d_reclen)
{
eof = 0;
done = 1;
break;
}
error = uiomove((caddr_t) dp, dp->d_reclen, uio);
if (error)
break;
newoff = fxdr_hyper(&ndp->cookie[0]);
if (ap->a_cookies != NULL)
{
*cookies = newoff;
cookies++;
ncookies--;
}
ndp = (struct nfs_dirent *)((u_int8_t *) ndp + reclen);
}
}
while (!error && !done && !eof && cnt--);
free(data, M_TEMP);
data = NULL;
if (ap->a_cookies)
{
if (error)
{
free(*ap->a_cookies, M_TEMP);
*ap->a_cookies = NULL;
*ap->a_ncookies = 0;
}
else
{
*ap->a_ncookies -= ncookies;
}
}
if (!error)
uio->uio_offset = newoff;
if (!error && (eof || uio->uio_resid == tresid))
{
nfsstats.direofcache_misses++;
*ap->a_eofflag = 1;
return (0);
}
*ap->a_eofflag = 0;
return (error);
}
/* Readdir rpc call. */
int
nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
int *end_of_directory)
{
int len, left;
struct nfs_dirent *ndp = NULL;
struct dirent *dp = NULL;
struct nfsm_info info;
u_int32_t *tl;
caddr_t cp;
int32_t t1;
caddr_t cp2;
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;
info.nmi_v3 = NFS_ISV3(vp);
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1 || (uiop->uio_resid & (NFS_DIRBLKSIZ - 1)))
panic("nfs readdirrpc bad uio");
#endif
txdr_hyper(uiop->uio_offset, &cookie.nfsuquad[0]);
/* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of NFS_READDIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough)
{
nfsstats.rpccnt[NFSPROC_READDIR]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)
+ NFSX_READDIR(info.nmi_v3));
nfsm_fhtom(&info, vp, info.nmi_v3);
if (info.nmi_v3)
{
tl = nfsm_build(&info.nmi_mb, 5 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
if (cookie.nfsuquad[0] == 0 && cookie.nfsuquad[1] == 0)
{
*tl++ = 0;
*tl++ = 0;
}
else
{
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
}
}
else
{
tl = nfsm_build(&info.nmi_mb, 2 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[1];
}
*tl = txdr_unsigned(nmp->nm_readdirsize);
info.nmi_procp = uiop->uio_procp;
info.nmi_cred = cred;
error = nfs_request(vp, NFSPROC_READDIR, &info);
if (info.nmi_v3)
nfsm_postop_attr(vp, attrflag);
if (error)
{
m_freem(info.nmi_mrep);
goto nfsmout;
}
if (info.nmi_v3)
{
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl;
}
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 (info.nmi_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(info.nmi_mrep);
goto nfsmout;
}
tlen = nfsm_rndup(len + 1);
left = NFS_READDIRBLKSIZ - blksiz;
if ((tlen + NFS_DIRHDSIZ) > left)
{
dp->d_reclen += left;
uiop->uio_iov->iov_base += left;
uiop->uio_iov->iov_len -= left;
uiop->uio_resid -= left;
blksiz = 0;
}
if ((tlen + NFS_DIRHDSIZ) > uiop->uio_resid)
bigenough = 0;
if (bigenough)
{
ndp = (struct nfs_dirent *)uiop->uio_iov->iov_base;
dp = &ndp->dirent;
dp->d_fileno = (int)fileno;
dp->d_namlen = len;
dp->d_reclen = tlen + NFS_DIRHDSIZ;
dp->d_type = DT_UNKNOWN;
blksiz += dp->d_reclen;
if (blksiz == NFS_READDIRBLKSIZ)
blksiz = 0;
uiop->uio_resid -= NFS_DIRHDSIZ;
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base + NFS_DIRHDSIZ;
uiop->uio_iov->iov_len -= NFS_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_resid -= tlen;
}
else
nfsm_adv(nfsm_rndup(len));
if (info.nmi_v3)
{
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
}
else
{
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
}
if (bigenough)
{
if (info.nmi_v3)
{
ndp->cookie[0] = cookie.nfsuquad[0] = *tl++;
}
else
ndp->cookie[0] = 0;
ndp->cookie[1] = cookie.nfsuquad[1] = *tl++;
}
else if (info.nmi_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(info.nmi_mrep);
}
/* Fill last record, iff any, out to a multiple of NFS_READDIRBLKSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0)
{
left = NFS_READDIRBLKSIZ - blksiz;
dp->d_reclen += left;
uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left;
uiop->uio_iov->iov_len -= 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 = fxdr_hyper(&cookie.nfsuquad[0]);
if (end_of_directory)
*end_of_directory = 1;
}
else
{
if (uiop->uio_resid > 0)
printf("EEK! readdirrpc resid > 0\n");
}
nfsmout:
return (error);
}
/* NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). */
int
nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
int *end_of_directory)
{
int len, left;
struct nfs_dirent *ndirp = NULL;
struct dirent *dp = NULL;
struct nfsm_info info;
u_int32_t *tl;
caddr_t cp;
int32_t t1;
struct vnode *newvp;
caddr_t cp2, dpossav1, dpossav2;
struct mbuf *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;
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1 || (uiop->uio_resid & (NFS_DIRBLKSIZ - 1)))
panic("nfs readdirplusrpc bad uio");
#endif
ndp->ni_dvp = vp;
newvp = NULLVP;
txdr_hyper(uiop->uio_offset, &cookie.nfsuquad[0]);
/* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of NFS_READDIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough)
{
nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
info.nmi_mb = info.nmi_mreq =
nfsm_reqhead(NFSX_FH(1) + 6 * NFSX_UNSIGNED);
nfsm_fhtom(&info, vp, 1);
tl = nfsm_build(&info.nmi_mb, 6 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
if (cookie.nfsuquad[0] == 0 && cookie.nfsuquad[1] == 0)
{
*tl++ = 0;
*tl++ = 0;
}
else
{
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
}
*tl++ = txdr_unsigned(nmp->nm_readdirsize);
*tl = txdr_unsigned(nmp->nm_rsize);
info.nmi_procp = uiop->uio_procp;
info.nmi_cred = cred;
error = nfs_request(vp, NFSPROC_READDIRPLUS, &info);
nfsm_postop_attr(vp, attrflag);
if (error)
{
m_freem(info.nmi_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(info.nmi_mrep);
goto nfsmout;
}
tlen = nfsm_rndup(len + 1);
left = NFS_READDIRBLKSIZ - blksiz;
if ((tlen + NFS_DIRHDSIZ) > left)
{
dp->d_reclen += left;
uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left;
uiop->uio_iov->iov_len -= left;
uiop->uio_resid -= left;
blksiz = 0;
}
if ((tlen + NFS_DIRHDSIZ) > uiop->uio_resid)
bigenough = 0;
if (bigenough)
{
ndirp = (struct nfs_dirent *)uiop->uio_iov->iov_base;
dp = &ndirp->dirent;
dp->d_fileno = (int)fileno;
dp->d_namlen = len;
dp->d_reclen = tlen + NFS_DIRHDSIZ;
dp->d_type = DT_UNKNOWN;
blksiz += dp->d_reclen;
if (blksiz == NFS_READDIRBLKSIZ)
blksiz = 0;
uiop->uio_resid -= NFS_DIRHDSIZ;
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base + NFS_DIRHDSIZ;
uiop->uio_iov->iov_len -= NFS_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_resid -= tlen;
}
else
nfsm_adv(nfsm_rndup(len));
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
if (bigenough)
{
ndirp->cookie[0] = cookie.nfsuquad[0] = *tl++;
ndirp->cookie[1] = 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 = info.nmi_dpos;
mdsav1 = info.nmi_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 = info.nmi_dpos;
info.nmi_dpos = dpossav1;
mdsav2 = info.nmi_md;
info.nmi_md = mdsav1;
nfsm_loadattr(newvp, NULL);
info.nmi_dpos = dpossav2;
info.nmi_md = mdsav2;
dp->d_type = IFTODT(VTTOIF(np->n_vattr.va_type));
if (cnp->cn_namelen <= NCHNAMLEN)
{
ndp->ni_vp = newvp;
cache_purge(ndp->ni_dvp);
nfs_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)
{
vrele(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(info.nmi_mrep);
}
/* Fill last record, iff any, out to a multiple of NFS_READDIRBLKSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0)
{
left = NFS_READDIRBLKSIZ - blksiz;
dp->d_reclen += left;
uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left;
uiop->uio_iov->iov_len -= 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 = fxdr_hyper(&cookie.nfsuquad[0]);
if (end_of_directory)
*end_of_directory = 1;
}
else
{
if (uiop->uio_resid > 0)
printf("EEK! readdirplusrpc resid > 0\n");
}
nfsmout:
if (newvp != NULLVP)
vrele(newvp);
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...
*/
int
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
struct sillyrename *sp;
struct nfsnode *np;
int error;
cache_purge(dvp);
np = VTONFS(vp);
sp = malloc(sizeof(struct sillyrename), M_NFSREQ, M_WAITOK);
sp->s_cred = crdup(cnp->cn_cred);
sp->s_dvp = dvp;
vref(dvp);
if (vp->v_type == VDIR)
{
#ifdef DIAGNOSTIC
printf("nfs: sillyrename dir\n");
#endif
error = EINVAL;
goto bad;
}
/* Try lookitups until we get one that isn't there */
while (1)
{
/* Fudge together a funny name */
sp->s_namlen = snprintf(sp->s_name, sizeof sp->s_name,
".nfs%08X%08X", arc4random(), arc4random());
if (sp->s_namlen > sizeof sp->s_name)
sp->s_namlen = strlen(sp->s_name);
if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_proc, NULL))
break;
}
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(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
*/
int
nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
struct proc *procp, struct nfsnode **npp)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
struct vnode *newvp = NULL;
struct nfsnode *np, *dnp = VTONFS(dvp);
caddr_t cp2;
int error = 0, fhlen, attrflag;
nfsfh_t *nfhp;
info.nmi_v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
info.nmi_mb = info.nmi_mreq =
nfsm_reqhead(NFSX_FH(info.nmi_v3) + NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(&info, dvp, info.nmi_v3);
nfsm_strtom(name, len, NFS_MAXNAMLEN);
info.nmi_procp = procp;
info.nmi_cred = cred;
error = nfs_request(dvp, NFSPROC_LOOKUP, &info);
if (error && !info.nmi_v3)
{
m_freem(info.nmi_mrep);
goto nfsmout;
}
if (npp && !error)
{
nfsm_getfh(nfhp, fhlen, info.nmi_v3);
if (*npp)
{
np = *npp;
np->n_fhp = &np->n_fh;
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;
np = dnp;
}
else
{
error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
if (error)
{
m_freem(info.nmi_mrep);
return (error);
}
newvp = NFSTOV(np);
}
if (info.nmi_v3)
{
nfsm_postop_attr(newvp, attrflag);
if (!attrflag && *npp == NULL)
{
m_freem(info.nmi_mrep);
vrele(newvp);
return (ENOENT);
}
}
else
nfsm_loadattr(newvp, NULL);
}
m_freem(info.nmi_mrep);
nfsmout:
if (npp && *npp == NULL)
{
if (error)
{
if (newvp)
vrele(newvp);
}
else
*npp = np;
}
return (error);
}
/* Nfs Version 3 commit rpc */
int nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct proc *procp)
{
struct nfsm_info info;
u_int32_t *tl;
int32_t t1;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
caddr_t cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
if ((nmp->nm_flag & NFSMNT_HASWRITEVERF) == 0)
return (0);
nfsstats.rpccnt[NFSPROC_COMMIT]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1));
nfsm_fhtom(&info, vp, 1);
tl = nfsm_build(&info.nmi_mb, 3 * NFSX_UNSIGNED);
txdr_hyper(offset, tl);
tl += 2;
*tl = txdr_unsigned(cnt);
info.nmi_procp = procp;
info.nmi_cred = VTONFS(vp)->n_wcred;
error = nfs_request(vp, NFSPROC_COMMIT, &info);
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;
}
}
m_freem(info.nmi_mrep);
nfsmout:
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).
*/
int nfs_bmap(void *v)
{
struct vop_bmap_args *ap = v;
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);
return (0);
}
/* fsync vnode op. Just call nfs_flush() with commit == 1. */
int nfs_fsync(void *v)
{
struct vop_fsync_args *ap = v;
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.
*/
int
nfs_flush(struct vnode *vp, struct ucred *cred, int waitfor, struct proc *p,
int commit)
{
struct nfsnode *np = VTONFS(vp);
struct buf *bp;
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 = (u_quad_t) - 1, endoff = 0, toff;
#ifndef NFS_COMMITBVECSIZ
# define NFS_COMMITBVECSIZ 20
#endif
struct buf *bvec[NFS_COMMITBVECSIZ];
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:
bvecpos = 0;
if (NFS_ISV3(vp) && commit)
{
s = splbio();
for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp != NULL; bp = nbp)
{
nbp = LIST_NEXT(bp, b_vnbufs);
if (bvecpos >= NFS_COMMITBVECSIZ)
break;
if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT))
!= (B_DELWRI | B_NEEDCOMMIT))
continue;
bremfree(bp);
bp->b_flags |= B_WRITEINPROG;
buf_acquire(bp);
/* 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. */
bcstats.pendingwrites++;
bcstats.numwrites++;
retv = nfs_commit(vp, off, (int)(endoff - off), p);
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);
if (retv)
{
if (i == 0)
bcstats.pendingwrites--;
brelse(bp);
}
else
{
if (i > 0)
bcstats.pendingwrites++;
s = splbio();
buf_undirty(bp);
vp->v_numoutput++;
bp->b_flags |= B_ASYNC;
bp->b_flags &= ~(B_READ | B_DONE | B_ERROR);
bp->b_dirtyoff = bp->b_dirtyend = 0;
biodone(bp);
splx(s);
}
}
}
/* Start/do any write(s) that are required. */
loop:
s = splbio();
for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp != NULL; bp = nbp)
{
nbp = LIST_NEXT(bp, b_vnbufs);
if (bp->b_flags & B_BUSY)
{
if (waitfor != MNT_WAIT || passone)
continue;
bp->b_flags |= B_WANTED;
error = tsleep((caddr_t) bp, slpflag | (PRIBIO + 1),
"nfsfsync", slptimeo);
splx(s);
if (error)
{
if (nfs_sigintr(nmp, NULL, p))
return (EINTR);
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))
continue;
bremfree(bp);
if (passone || !commit)
{
bp->b_flags |= B_ASYNC;
}
else
{
bp->b_flags |= (B_ASYNC | B_WRITEINPROG | B_NEEDCOMMIT);
}
buf_acquire(bp);
splx(s);
VOP_BWRITE(bp);
goto loop;
}
splx(s);
if (passone)
{
passone = 0;
goto again;
}
if (waitfor == MNT_WAIT)
{
loop2:
s = splbio();
error = vwaitforio(vp, slpflag, "nfs_fsync", slptimeo);
splx(s);
if (error)
{
if (nfs_sigintr(nmp, NULL, p))
return (EINTR);
if (slpflag == PCATCH)
{
slpflag = 0;
slptimeo = 2 * hz;
}
goto loop2;
}
if (LIST_FIRST(&vp->v_dirtyblkhd) && commit)
{
#if 0
vprint("nfs_fsync: dirty", vp);
#endif
goto loop;
}
}
if (np->n_flag & NWRITEERR)
{
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
return (error);
}
/* Print out the contents of an nfsnode. */
int nfs_print(void *v)
{
struct vop_print_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
printf("tag VT_NFS, fileid %ld fsid 0x%lx",
np->n_vattr.va_fileid, np->n_vattr.va_fsid);
printf("\n");
return (0);
}
/* Just call nfs_writebp() with the force argument set to 1. */
int nfs_bwrite(void *v)
{
struct vop_bwrite_args *ap = v;
return (nfs_writebp(ap->a_bp, 1));
}
/* This is a clone of vop_generic_bwrite(), except that B_WRITEINPROG isn't set unless
* the force flag is one and it also handles the B_NEEDCOMMIT flag.
*/
int nfs_writebp(struct buf *bp, int force)
{
int oldflags = bp->b_flags, retv = 1;
struct proc *p = curproc; /* XXX */
off_t off;
size_t cnt;
int s;
struct vnode *vp;
struct nfsnode *np;
if (!(bp->b_flags & B_BUSY))
panic("bwrite: buffer is not busy???");
vp = bp->b_vp;
np = VTONFS(vp);
bp->b_flags &= ~(B_READ | B_DONE | B_ERROR);
s = splbio();
buf_undirty(bp);
if ((oldflags & B_ASYNC) && !(oldflags & B_DELWRI) && p)
++p->p_stats->p_ru.ru_oublock;
bp->b_vp->v_numoutput++;
splx(s);
/* If B_NEEDCOMMIT is set, a commit rpc may do the trick. If not
* an actual write will have to be scheduled via. VOP_STRATEGY().
* If B_WRITEINPROG is already set, then push it with a write anyhow.
*/
if ((oldflags & (B_NEEDCOMMIT | B_WRITEINPROG)) == B_NEEDCOMMIT)
{
off = ((u_quad_t) bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
cnt = bp->b_dirtyend - bp->b_dirtyoff;
rw_enter_write(&np->n_commitlock);
if (!(bp->b_flags & B_NEEDCOMMIT))
{
rw_exit_write(&np->n_commitlock);
return (0);
}
/* If it's already been commited by somebody else, bail. */
if (!nfs_in_committed_range(vp, bp))
{
int pushedrange = 0;
/* Since we're going to do this, push as much as we can. */
if (nfs_in_tobecommitted_range(vp, bp))
{
pushedrange = 1;
off = np->n_pushlo;
cnt = np->n_pushhi - np->n_pushlo;
}
bp->b_flags |= B_WRITEINPROG;
bcstats.pendingwrites++;
bcstats.numwrites++;
retv = nfs_commit(bp->b_vp, off, cnt, curproc);
bp->b_flags &= ~B_WRITEINPROG;
if (retv == 0)
{
if (pushedrange)
nfs_merge_commit_ranges(vp);
else
nfs_add_committed_range(vp, bp);
}
else
bcstats.pendingwrites--;
}
else
retv = 0; /* It has already been commited. */
rw_exit_write(&np->n_commitlock);
if (!retv)
{
bp->b_dirtyoff = bp->b_dirtyend = 0;
bp->b_flags &= ~B_NEEDCOMMIT;
s = splbio();
biodone(bp);
splx(s);
}
else if (retv == NFSERR_STALEWRITEVERF)
nfs_clearcommit(bp->b_vp->v_mount);
}
if (retv)
{
if (force)
bp->b_flags |= B_WRITEINPROG;
VOP_STRATEGY(bp);
}
if ((oldflags & B_ASYNC) == 0)
{
int rtval;
bp->b_flags |= B_RAW;
rtval = biowait(bp);
if (!(oldflags & B_DELWRI) && p)
{
++p->p_stats->p_ru.ru_oublock;
}
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.
*/
int nfsspec_access(void *v)
{
struct vop_access_args *ap = v;
struct vattr va;
struct vnode *vp = ap->a_vp;
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 ((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;
}
}
error = VOP_GETATTR(vp, &va, ap->a_cred, ap->a_p);
if (error)
return (error);
return (vaccess(vp->v_type, va.va_mode, va.va_uid, va.va_gid,
ap->a_mode, ap->a_cred));
}
int nfs_poll(void *v)
{
struct vop_poll_args *ap = v;
/* We should really check to see if I/O is possible. */
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
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