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freebsd-skq/sys/nfsclient/nfs_vnops.c
John Baldwin 12ac99dc46 Close a race with caching of -ve name lookups in the NFS client. 
Specifically, clients only trust -ve cache entries while the directory
remains unchanged and discard any -ve cache entries for a directory when
they notice that the modification time of a directory entry changes.  The
race involves two concurrent lookups as follows:
- Thread A does a lookup for file 'foo' which sends a lookup RPC to the
  server.  The lookup fails and the server replies.
- The 'foo' file is created (either by the same client or a different
  client) updating the modification time on the parent directory of 'foo'.
- Thread B does a lookup for a different file 'bar' which updates the
  cached attributes of the parent directory of 'foo' to reflect the new
  modification time after 'foo' was created.
- Thread A finally resumes execution to parse the reply from the NFS
  server.  It adds a -ve cache entry and sets the cached value of the
  directory's modification time that is used for invalidating -ve cached
  lookups to the new modification time set by thread B.

At this point, future lookups of 'foo' will honor the -ve cached entry
until the cached entry is pushed out of the name cache's LRU or the
modification time of the parent directory is changed again by some other
change.  The fix is to read the directory's modification time before
sending the lookup RPC and use that cached modification time when setting
the directory's cached modification time.  Also, we do not add a -ve cache
entry if another thread has added -ve cache entry that set the directory's
cached modification time to a newer value than the value we read before
sending the lookup RPC.

Reviewed by:	rmacklem
MFC after:	1 week
2009-10-16 19:30:48 +00:00

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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.
* 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
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* vnode op calls for Sun NFS version 2 and 3
*/
#include "opt_inet.h"
#include "opt_kdtrace.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/jail.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 <sys/signalvar.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <fs/fifofs/fifo.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsnode.h>
#include <nfsclient/nfsmount.h>
#include <nfsclient/nfs_kdtrace.h>
#include <nfsclient/nfs_lock.h>
#include <nfs/xdr_subs.h>
#include <nfsclient/nfsm_subs.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <machine/stdarg.h>
#ifdef KDTRACE_HOOKS
#include <sys/dtrace_bsd.h>
dtrace_nfsclient_accesscache_flush_probe_func_t
dtrace_nfsclient_accesscache_flush_done_probe;
uint32_t nfsclient_accesscache_flush_done_id;
dtrace_nfsclient_accesscache_get_probe_func_t
dtrace_nfsclient_accesscache_get_hit_probe,
dtrace_nfsclient_accesscache_get_miss_probe;
uint32_t nfsclient_accesscache_get_hit_id;
uint32_t nfsclient_accesscache_get_miss_id;
dtrace_nfsclient_accesscache_load_probe_func_t
dtrace_nfsclient_accesscache_load_done_probe;
uint32_t nfsclient_accesscache_load_done_id;
#endif /* !KDTRACE_HOOKS */
/* 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 vop_read_t nfsfifo_read;
static vop_write_t nfsfifo_write;
static vop_close_t nfsfifo_close;
static int nfs_flush(struct vnode *, int, int);
static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *);
static vop_lookup_t nfs_lookup;
static vop_create_t nfs_create;
static vop_mknod_t nfs_mknod;
static vop_open_t nfs_open;
static vop_close_t nfs_close;
static vop_access_t nfs_access;
static vop_getattr_t nfs_getattr;
static vop_setattr_t nfs_setattr;
static vop_read_t nfs_read;
static vop_fsync_t nfs_fsync;
static vop_remove_t nfs_remove;
static vop_link_t nfs_link;
static vop_rename_t nfs_rename;
static vop_mkdir_t nfs_mkdir;
static vop_rmdir_t nfs_rmdir;
static vop_symlink_t nfs_symlink;
static vop_readdir_t nfs_readdir;
static vop_strategy_t nfs_strategy;
static int nfs_lookitup(struct vnode *, const char *, int,
struct ucred *, struct thread *, struct nfsnode **);
static int nfs_sillyrename(struct vnode *, struct vnode *,
struct componentname *);
static vop_access_t nfsspec_access;
static vop_readlink_t nfs_readlink;
static vop_print_t nfs_print;
static vop_advlock_t nfs_advlock;
static vop_advlockasync_t nfs_advlockasync;
/*
* Global vfs data structures for nfs
*/
struct vop_vector nfs_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = nfs_access,
.vop_advlock = nfs_advlock,
.vop_advlockasync = nfs_advlockasync,
.vop_close = nfs_close,
.vop_create = nfs_create,
.vop_fsync = nfs_fsync,
.vop_getattr = nfs_getattr,
.vop_getpages = nfs_getpages,
.vop_putpages = nfs_putpages,
.vop_inactive = nfs_inactive,
.vop_link = nfs_link,
.vop_lookup = nfs_lookup,
.vop_mkdir = nfs_mkdir,
.vop_mknod = nfs_mknod,
.vop_open = nfs_open,
.vop_print = nfs_print,
.vop_read = nfs_read,
.vop_readdir = nfs_readdir,
.vop_readlink = nfs_readlink,
.vop_reclaim = nfs_reclaim,
.vop_remove = nfs_remove,
.vop_rename = nfs_rename,
.vop_rmdir = nfs_rmdir,
.vop_setattr = nfs_setattr,
.vop_strategy = nfs_strategy,
.vop_symlink = nfs_symlink,
.vop_write = nfs_write,
};
struct vop_vector nfs_fifoops = {
.vop_default = &fifo_specops,
.vop_access = nfsspec_access,
.vop_close = nfsfifo_close,
.vop_fsync = nfs_fsync,
.vop_getattr = nfs_getattr,
.vop_inactive = nfs_inactive,
.vop_print = nfs_print,
.vop_read = nfsfifo_read,
.vop_reclaim = nfs_reclaim,
.vop_setattr = nfs_setattr,
.vop_write = nfsfifo_write,
};
static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
struct componentname *cnp, struct vattr *vap);
static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
struct ucred *cred, struct thread *td);
static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
int fnamelen, struct vnode *tdvp,
const char *tnameptr, int tnamelen,
struct ucred *cred, struct thread *td);
static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
struct sillyrename *sp);
/*
* Global variables
*/
struct mtx nfs_iod_mtx;
struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
int nfs_numasync = 0;
vop_advlock_t *nfs_advlock_p = nfs_dolock;
vop_reclaim_t *nfs_reclaim_p = NULL;
#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 nfs_prime_access_cache = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
&nfs_prime_access_cache, 0,
"Prime NFS ACCESS cache when fetching attributes");
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");
static int nfs_clean_pages_on_close = 1;
SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
&nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
int nfs_directio_enable = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
&nfs_directio_enable, 0, "Enable NFS directio");
/*
* This sysctl allows other processes to mmap a file that has been opened
* O_DIRECT by a process. In general, having processes mmap the file while
* Direct IO is in progress can lead to Data Inconsistencies. But, we allow
* this by default to prevent DoS attacks - to prevent a malicious user from
* opening up files O_DIRECT preventing other users from mmap'ing these
* files. "Protected" environments where stricter consistency guarantees are
* required can disable this knob. The process that opened the file O_DIRECT
* cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
* meaningful.
*/
int nfs_directio_allow_mmap = 1;
SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
&nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
#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)
/*
* SMP Locking Note :
* The list of locks after the description of the lock is the ordering
* of other locks acquired with the lock held.
* np->n_mtx : Protects the fields in the nfsnode.
VM Object Lock
VI_MTX (acquired indirectly)
* nmp->nm_mtx : Protects the fields in the nfsmount.
rep->r_mtx
* nfs_iod_mtx : Global lock, protects shared nfsiod state.
* nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
nmp->nm_mtx
rep->r_mtx
* rep->r_mtx : Protects the fields in an nfsreq.
*/
static int
nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
struct ucred *cred, uint32_t *retmode)
{
const int v3 = 1;
u_int32_t *tl;
int error = 0, attrflag, i, lrupos;
struct mbuf *mreq, *mrep, *md, *mb;
caddr_t bpos, dpos;
u_int32_t rmode;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_ACCESS]++;
mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(wmode);
nfsm_request(vp, NFSPROC_ACCESS, td, cred);
nfsm_postop_attr(vp, attrflag);
if (!error) {
lrupos = 0;
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
rmode = fxdr_unsigned(u_int32_t, *tl);
mtx_lock(&np->n_mtx);
for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
if (np->n_accesscache[i].uid == cred->cr_uid) {
np->n_accesscache[i].mode = rmode;
np->n_accesscache[i].stamp = time_second;
break;
}
if (i > 0 && np->n_accesscache[i].stamp <
np->n_accesscache[lrupos].stamp)
lrupos = i;
}
if (i == NFS_ACCESSCACHESIZE) {
np->n_accesscache[lrupos].uid = cred->cr_uid;
np->n_accesscache[lrupos].mode = rmode;
np->n_accesscache[lrupos].stamp = time_second;
}
mtx_unlock(&np->n_mtx);
if (retmode != NULL)
*retmode = rmode;
KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
}
m_freem(mrep);
nfsmout:
#ifdef KDTRACE_HOOKS
if (error) {
KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
error);
}
#endif
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(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
int error = 0, i, gotahit;
u_int32_t mode, rmode, 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_accmode & 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_accmode & VREAD)
mode = NFSV3ACCESS_READ;
else
mode = 0;
if (vp->v_type != VDIR) {
if (ap->a_accmode & VWRITE)
mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
if (ap->a_accmode & VEXEC)
mode |= NFSV3ACCESS_EXECUTE;
} else {
if (ap->a_accmode & VWRITE)
mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
NFSV3ACCESS_DELETE);
if (ap->a_accmode & 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?
*/
gotahit = 0;
mtx_lock(&np->n_mtx);
for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
if (time_second < (np->n_accesscache[i].stamp +
nfsaccess_cache_timeout) &&
(np->n_accesscache[i].mode & mode) == mode) {
nfsstats.accesscache_hits++;
gotahit = 1;
}
break;
}
}
mtx_unlock(&np->n_mtx);
#ifdef KDTRACE_HOOKS
if (gotahit)
KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
ap->a_cred->cr_uid, mode);
else
KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
ap->a_cred->cr_uid, mode);
#endif
if (gotahit == 0) {
/*
* Either a no, or a don't know. Go to the wire.
*/
nfsstats.accesscache_misses++;
error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred,
&rmode);
if (!error) {
if ((rmode & 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.
*/
mtx_lock(&np->n_mtx);
if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
&& VTONFS(vp)->n_size > 0) {
struct iovec aiov;
struct uio auio;
char buf[1];
mtx_unlock(&np->n_mtx);
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_td = ap->a_td;
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;
} else
mtx_unlock(&np->n_mtx);
return (error);
}
}
int nfs_otw_getattr_avoid = 0;
/*
* 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(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct vattr vattr;
int error;
int fmode = ap->a_mode;
if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
return (EOPNOTSUPP);
/*
* Get a valid lease. If cached data is stale, flush it.
*/
mtx_lock(&np->n_mtx);
if (np->n_flag & NMODIFIED) {
mtx_unlock(&np->n_mtx);
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
if (error == EINTR || error == EIO)
return (error);
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
if (vp->v_type == VDIR)
np->n_direofoffset = 0;
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
if (error)
return (error);
mtx_lock(&np->n_mtx);
np->n_mtime = vattr.va_mtime;
mtx_unlock(&np->n_mtx);
} else {
struct thread *td = curthread;
if (np->n_ac_ts_syscalls != td->td_syscalls ||
np->n_ac_ts_tid != td->td_tid ||
td->td_proc == NULL ||
np->n_ac_ts_pid != td->td_proc->p_pid) {
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
}
mtx_unlock(&np->n_mtx);
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
if (error)
return (error);
mtx_lock(&np->n_mtx);
if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
if (vp->v_type == VDIR)
np->n_direofoffset = 0;
mtx_unlock(&np->n_mtx);
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
if (error == EINTR || error == EIO) {
return (error);
}
mtx_lock(&np->n_mtx);
np->n_mtime = vattr.va_mtime;
}
mtx_unlock(&np->n_mtx);
}
/*
* If the object has >= 1 O_DIRECT active opens, we disable caching.
*/
if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
if (np->n_directio_opens == 0) {
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
if (error)
return (error);
mtx_lock(&np->n_mtx);
np->n_flag |= NNONCACHE;
mtx_unlock(&np->n_mtx);
}
np->n_directio_opens++;
}
vnode_create_vobject(vp, vattr.va_size, ap->a_td);
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.
*/
/* ARGSUSED */
static int
nfs_close(struct vop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
int fmode = ap->a_fflag;
if (vp->v_type == VREG) {
/*
* Examine and clean dirty pages, regardless of NMODIFIED.
* This closes a major hole in close-to-open consistency.
* We want to push out all dirty pages (and buffers) on
* close, regardless of whether they were dirtied by
* mmap'ed writes or via write().
*/
if (nfs_clean_pages_on_close && vp->v_object) {
VM_OBJECT_LOCK(vp->v_object);
vm_object_page_clean(vp->v_object, 0, 0, 0);
VM_OBJECT_UNLOCK(vp->v_object);
}
mtx_lock(&np->n_mtx);
if (np->n_flag & NMODIFIED) {
mtx_unlock(&np->n_mtx);
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, MNT_WAIT, cm);
/* np->n_flag &= ~NMODIFIED; */
} else
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
mtx_lock(&np->n_mtx);
}
if (np->n_flag & NWRITEERR) {
np->n_flag &= ~NWRITEERR;
error = np->n_error;
}
mtx_unlock(&np->n_mtx);
}
if (nfs_directio_enable)
KASSERT((np->n_directio_asyncwr == 0),
("nfs_close: dirty unflushed (%d) directio buffers\n",
np->n_directio_asyncwr));
if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
mtx_lock(&np->n_mtx);
KASSERT((np->n_directio_opens > 0),
("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
np->n_directio_opens--;
if (np->n_directio_opens == 0)
np->n_flag &= ~NNONCACHE;
mtx_unlock(&np->n_mtx);
}
return (error);
}
/*
* nfs getattr call from vfs.
*/
static int
nfs_getattr(struct vop_getattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct thread *td = curthread;
struct vattr *vap = ap->a_vap;
struct vattr vattr;
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(vp);
/*
* Update local times for special files.
*/
mtx_lock(&np->n_mtx);
if (np->n_flag & (NACC | NUPD))
np->n_flag |= NCHG;
mtx_unlock(&np->n_mtx);
/*
* First look in the cache.
*/
if (nfs_getattrcache(vp, &vattr) == 0)
goto nfsmout;
if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) {
nfsstats.accesscache_misses++;
nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL);
if (nfs_getattrcache(vp, &vattr) == 0)
goto nfsmout;
}
nfsstats.rpccnt[NFSPROC_GETATTR]++;
mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred);
if (!error) {
nfsm_loadattr(vp, &vattr);
}
m_freem(mrep);
nfsmout:
vap->va_type = vattr.va_type;
vap->va_mode = vattr.va_mode;
vap->va_nlink = vattr.va_nlink;
vap->va_uid = vattr.va_uid;
vap->va_gid = vattr.va_gid;
vap->va_fsid = vattr.va_fsid;
vap->va_fileid = vattr.va_fileid;
vap->va_size = vattr.va_size;
vap->va_blocksize = vattr.va_blocksize;
vap->va_atime = vattr.va_atime;
vap->va_mtime = vattr.va_mtime;
vap->va_ctime = vattr.va_ctime;
vap->va_gen = vattr.va_gen;
vap->va_flags = vattr.va_flags;
vap->va_rdev = vattr.va_rdev;
vap->va_bytes = vattr.va_bytes;
vap->va_filerev = vattr.va_filerev;
return (error);
}
/*
* nfs setattr call.
*/
static int
nfs_setattr(struct vop_setattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct vattr *vap = ap->a_vap;
struct thread *td = curthread;
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)) {
error = EROFS;
goto out;
}
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);
/*
* We run vnode_pager_setsize() early (why?),
* we must set np->n_size now to avoid vinvalbuf
* V_SAVE races that might setsize a lower
* value.
*/
mtx_lock(&np->n_mtx);
tsize = np->n_size;
mtx_unlock(&np->n_mtx);
error = nfs_meta_setsize(vp, ap->a_cred, td,
vap->va_size);
mtx_lock(&np->n_mtx);
if (np->n_flag & NMODIFIED) {
tsize = np->n_size;
mtx_unlock(&np->n_mtx);
if (vap->va_size == 0)
error = nfs_vinvalbuf(vp, 0, td, 1);
else
error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
if (error) {
vnode_pager_setsize(vp, tsize);
goto out;
}
} else
mtx_unlock(&np->n_mtx);
/*
* np->n_size has already been set to vap->va_size
* in nfs_meta_setsize(). We must set it again since
* nfs_loadattrcache() could be called through
* nfs_meta_setsize() and could modify np->n_size.
*/
mtx_lock(&np->n_mtx);
np->n_vattr.va_size = np->n_size = vap->va_size;
mtx_unlock(&np->n_mtx);
};
} else {
mtx_lock(&np->n_mtx);
if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
(np->n_flag & NMODIFIED) && vp->v_type == VREG) {
mtx_unlock(&np->n_mtx);
if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
(error == EINTR || error == EIO))
return error;
} else
mtx_unlock(&np->n_mtx);
}
error = nfs_setattrrpc(vp, vap, ap->a_cred);
if (error && vap->va_size != VNOVAL) {
mtx_lock(&np->n_mtx);
np->n_size = np->n_vattr.va_size = tsize;
vnode_pager_setsize(vp, tsize);
mtx_unlock(&np->n_mtx);
}
out:
return (error);
}
/*
* Do an nfs setattr rpc.
*/
static int
nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
{
struct nfsv2_sattr *sp;
struct nfsnode *np = VTONFS(vp);
caddr_t bpos, dpos;
u_int32_t *tl;
int error = 0, i, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_SETATTR]++;
mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
if (v3) {
nfsm_v3attrbuild(vap, TRUE);
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = nfs_false;
} else {
sp = nfsm_build(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, curthread, cred);
if (v3) {
mtx_lock(&np->n_mtx);
for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
np->n_accesscache[i].stamp = 0;
mtx_unlock(&np->n_mtx);
KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
nfsm_wcc_data(vp, wccflag);
} else
nfsm_loadattr(vp, NULL);
m_freem(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
*/
static int
nfs_lookup(struct vop_lookup_args *ap)
{
struct componentname *cnp = ap->a_cnp;
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct mount *mp = dvp->v_mount;
struct vattr vattr;
time_t dmtime;
int flags = cnp->cn_flags;
struct vnode *newvp;
struct nfsmount *nmp;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep, *md, *mb;
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int error = 0, attrflag, fhsize, ltype;
int v3 = NFS_ISV3(dvp);
struct thread *td = cnp->cn_thread;
*vpp = NULLVP;
if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if (dvp->v_type != VDIR)
return (ENOTDIR);
nmp = VFSTONFS(mp);
np = VTONFS(dvp);
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
*vpp = NULLVP;
return (error);
}
error = cache_lookup(dvp, vpp, cnp);
if (error > 0 && error != ENOENT)
return (error);
if (error == -1) {
/*
* We only accept a positive hit in the cache if the
* change time of the file matches our cached copy.
* Otherwise, we discard the cache entry and fallback
* to doing a lookup RPC.
*/
newvp = *vpp;
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred)
&& 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);
if (dvp != newvp)
vput(newvp);
else
vrele(newvp);
*vpp = NULLVP;
} else if (error == ENOENT) {
if (dvp->v_iflag & VI_DOOMED)
return (ENOENT);
/*
* We only accept a negative hit in the cache if the
* modification time of the parent directory matches
* our cached copy. Otherwise, we discard all of the
* negative cache entries for this directory.
*/
if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
vattr.va_mtime.tv_sec == np->n_dmtime) {
nfsstats.lookupcache_hits++;
return (ENOENT);
}
cache_purge_negative(dvp);
mtx_lock(&np->n_mtx);
np->n_dmtime = 0;
mtx_unlock(&np->n_mtx);
}
/*
* Cache the modification time of the parent directory in case
* the lookup fails and results in adding the first negative
* name cache entry for the directory. Since this is reading
* a single time_t, don't bother with locking. The
* modification time may be a bit stale, but it must be read
* before performing the lookup RPC to prevent a race where
* another lookup updates the timestamp on the directory after
* the lookup RPC has been performed on the server but before
* n_dmtime is set at the end of this function.
*/
dmtime = np->n_vattr.va_mtime.tv_sec;
error = 0;
newvp = NULLVP;
nfsstats.lookupcache_misses++;
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
len = cnp->cn_namelen;
mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
if (error) {
if (v3) {
nfsm_postop_attr(dvp, attrflag);
m_freem(mrep);
}
goto nfsmout;
}
nfsm_getfh(fhp, fhsize, v3);
/*
* Handle RENAME case...
*/
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
if (NFS_CMPFH(np, fhp, fhsize)) {
m_freem(mrep);
return (EISDIR);
}
error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE);
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, NULL);
*vpp = newvp;
m_freem(mrep);
cnp->cn_flags |= SAVENAME;
return (0);
}
if (flags & ISDOTDOT) {
ltype = VOP_ISLOCKED(dvp);
error = vfs_busy(mp, MBF_NOWAIT);
if (error != 0) {
vfs_ref(mp);
VOP_UNLOCK(dvp, 0);
error = vfs_busy(mp, 0);
vn_lock(dvp, ltype | LK_RETRY);
vfs_rel(mp);
if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
vfs_unbusy(mp);
error = ENOENT;
}
if (error != 0) {
m_freem(mrep);
return (error);
}
}
VOP_UNLOCK(dvp, 0);
error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
if (error == 0)
newvp = NFSTOV(np);
vfs_unbusy(mp);
if (newvp != dvp)
vn_lock(dvp, ltype | LK_RETRY);
if (dvp->v_iflag & VI_DOOMED) {
if (error == 0) {
if (newvp == dvp)
vrele(newvp);
else
vput(newvp);
}
error = ENOENT;
}
if (error) {
m_freem(mrep);
return (error);
}
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
} else {
error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
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, NULL);
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;
m_freem(mrep);
nfsmout:
if (error) {
if (newvp != NULLVP) {
vput(newvp);
*vpp = NULLVP;
}
if (error != ENOENT)
goto done;
/* The requested file was not found. */
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN)) {
/*
* XXX: UFS does a full VOP_ACCESS(dvp,
* VWRITE) here instead of just checking
* MNT_RDONLY.
*/
if (mp->mnt_flag & MNT_RDONLY)
return (EROFS);
cnp->cn_flags |= SAVENAME;
return (EJUSTRETURN);
}
if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) {
/*
* Maintain n_dmtime as the modification time
* of the parent directory when the oldest -ve
* name cache entry for this directory was
* added. If a -ve cache entry has already
* been added with a newer modification time
* by a concurrent lookup, then don't bother
* adding a cache entry. The modification
* time of the directory might have changed
* due to the file this lookup failed to find
* being created. In that case a subsequent
* lookup would incorrectly use the entry
* added here instead of doing an extra
* lookup.
*/
mtx_lock(&np->n_mtx);
if (np->n_dmtime <= dmtime) {
if (np->n_dmtime == 0)
np->n_dmtime = dmtime;
mtx_unlock(&np->n_mtx);
cache_enter(dvp, NULL, cnp);
} else
mtx_unlock(&np->n_mtx);
}
return (ENOENT);
}
done:
return (error);
}
/*
* nfs read call.
* Just call nfs_bioread() to do the work.
*/
static int
nfs_read(struct vop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
switch (vp->v_type) {
case VREG:
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
case VDIR:
return (EISDIR);
default:
return (EOPNOTSUPP);
}
}
/*
* nfs readlink call
*/
static int
nfs_readlink(struct vop_readlink_args *ap)
{
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(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
caddr_t bpos, dpos;
int error = 0, len, attrflag;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_READLINK]++;
mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
if (v3)
nfsm_postop_attr(vp, attrflag);
if (!error) {
nfsm_strsiz(len, NFS_MAXPATHLEN);
if (len == NFS_MAXPATHLEN) {
struct nfsnode *np = VTONFS(vp);
mtx_lock(&np->n_mtx);
if (np->n_size && np->n_size < NFS_MAXPATHLEN)
len = np->n_size;
mtx_unlock(&np->n_mtx);
}
nfsm_mtouio(uiop, len);
}
m_freem(mrep);
nfsmout:
return (error);
}
/*
* nfs read rpc call
* Ditto above
*/
int
nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
u_int32_t *tl;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsmount *nmp;
int error = 0, len, retlen, tsiz, eof, attrflag;
int v3 = NFS_ISV3(vp);
int rsize;
#ifndef nolint
eof = 0;
#endif
nmp = VFSTONFS(vp->v_mount);
tsiz = uiop->uio_resid;
mtx_lock(&nmp->nm_mtx);
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
mtx_unlock(&nmp->nm_mtx);
return (EFBIG);
}
rsize = nmp->nm_rsize;
mtx_unlock(&nmp->nm_mtx);
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_READ]++;
len = (tsiz > rsize) ? rsize : tsiz;
mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
tl = nfsm_build(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_td, cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
if (error) {
m_freem(mrep);
goto nfsmout;
}
tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
eof = fxdr_unsigned(int, *(tl + 1));
} else {
nfsm_loadattr(vp, NULL);
}
nfsm_strsiz(retlen, 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(struct vnode *vp, struct uio *uiop, struct ucred *cred,
int *iomode, int *must_commit)
{
u_int32_t *tl;
int32_t backup;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep, *md, *mb;
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;
int wsize;
#ifndef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfs: writerpc iovcnt > 1");
#endif
*must_commit = 0;
tsiz = uiop->uio_resid;
mtx_lock(&nmp->nm_mtx);
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) {
mtx_unlock(&nmp->nm_mtx);
return (EFBIG);
}
wsize = nmp->nm_wsize;
mtx_unlock(&nmp->nm_mtx);
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = (tsiz > wsize) ? wsize : tsiz;
mreq = nfsm_reqhead(vp, NFSPROC_WRITE,
NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
if (v3) {
tl = nfsm_build(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 {
u_int32_t x;
tl = nfsm_build(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_td, cred);
if (v3) {
wccflag = NFSV3_WCCCHK;
nfsm_wcc_data(vp, wccflag);
if (!error) {
tl = nfsm_dissect(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 =
(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;
mtx_lock(&nmp->nm_mtx);
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);
}
mtx_unlock(&nmp->nm_mtx);
}
} else {
nfsm_loadattr(vp, NULL);
}
if (wccflag) {
mtx_lock(&(VTONFS(vp))->n_mtx);
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
mtx_unlock(&(VTONFS(vp))->n_mtx);
}
m_freem(mrep);
if (error)
break;
tsiz -= len;
}
nfsmout:
if (vp->v_mount->mnt_kern_flag & MNTK_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(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
struct vattr *vap)
{
struct nfsv2_sattr *sp;
u_int32_t *tl;
struct vnode *newvp = NULL;
struct nfsnode *np = NULL;
struct vattr vattr;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb;
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)) != 0)
return (error);
nfsstats.rpccnt[NFSPROC_MKNOD]++;
mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
+ nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (v3) {
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl++ = vtonfsv3_type(vap->va_type);
nfsm_v3attrbuild(vap, FALSE);
if (vap->va_type == VCHR || vap->va_type == VBLK) {
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(major(vap->va_rdev));
*tl = txdr_unsigned(minor(vap->va_rdev));
}
} else {
sp = nfsm_build(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_thread, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
if (newvp) {
vput(newvp);
newvp = NULL;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
if (!error)
newvp = NFSTOV(np);
}
}
if (v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(mrep);
nfsmout:
if (error) {
if (newvp)
vput(newvp);
} else {
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
*vpp = newvp;
}
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
mtx_unlock(&(VTONFS(dvp))->n_mtx);
return (error);
}
/*
* nfs mknod vop
* just call nfs_mknodrpc() to do the work.
*/
/* ARGSUSED */
static int
nfs_mknod(struct vop_mknod_args *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(struct vop_create_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
u_int32_t *tl;
struct nfsnode *np = NULL;
struct vnode *newvp = NULL;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
struct mbuf *mreq, *mrep, *md, *mb;
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)) != 0)
return (error);
if (vap->va_vaflags & VA_EXCLUSIVE)
fmode |= O_EXCL;
again:
nfsstats.rpccnt[NFSPROC_CREATE]++;
mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
if (v3) {
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
if (fmode & O_EXCL) {
*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
#ifdef INET
CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
IN_IFADDR_RLOCK();
if (!TAILQ_EMPTY(&V_in_ifaddrhead))
*tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
else
#endif
*tl++ = create_verf;
#ifdef INET
IN_IFADDR_RUNLOCK();
CURVNET_RESTORE();
#endif
*tl = ++create_verf;
} else {
*tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
nfsm_v3attrbuild(vap, FALSE);
}
} else {
sp = nfsm_build(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_thread, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
if (newvp) {
vput(newvp);
newvp = NULL;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
if (!error)
newvp = NFSTOV(np);
}
}
if (v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(mrep);
nfsmout:
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)) {
/*
* We are normally called with only a partially initialized
* VAP. Since the NFSv3 spec says that server may use the
* file attributes to store the verifier, the spec requires
* us to do a SETATTR RPC. FreeBSD servers store the verifier
* in atime, but we can't really assume that all servers will
* so we ensure that our SETATTR sets both atime and mtime.
*/
if (vap->va_mtime.tv_sec == VNOVAL)
vfs_timestamp(&vap->va_mtime);
if (vap->va_atime.tv_sec == VNOVAL)
vap->va_atime = vap->va_mtime;
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred);
if (error)
vput(newvp);
}
if (!error) {
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
}
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
mtx_unlock(&(VTONFS(dvp))->n_mtx);
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(struct vop_remove_args *ap)
{
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;
#ifndef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("nfs_remove: no name");
if (vrefcnt(vp) < 1)
panic("nfs_remove: bad v_usecount");
#endif
if (vp->v_type == VDIR)
error = EPERM;
else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
!VOP_GETATTR(vp, &vattr, cnp->cn_cred) && 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_thread, 1);
/* Do the rpc */
if (error != EINTR && error != EIO)
error = nfs_removerpc(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
/*
* 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;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
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.
*/
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().
*/
static int
nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
struct ucred *cred, struct thread *td)
{
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_REMOVE]++;
mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
if (v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(mrep);
nfsmout:
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
mtx_unlock(&(VTONFS(dvp))->n_mtx);
return (error);
}
/*
* nfs file rename call
*/
static int
nfs_rename(struct vop_rename_args *ap)
{
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;
#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;
}
if (fvp == tvp) {
nfs_printf("nfs_rename: fvp == tvp (can't happen)\n");
error = 0;
goto out;
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
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.
*
* Skip the rename operation if the fsync fails, this can happen
* due to the server's volume being full, when we pushed out data
* that was written back to our cache earlier. Not checking for
* this condition can result in potential (silent) data loss.
*/
error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
VOP_UNLOCK(fvp, 0);
if (!error && tvp)
error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
if (error)
goto out;
/*
* 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 && vrefcnt(tvp) > 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_thread);
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(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, scnp->cn_thread));
}
/*
* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
*/
static int
nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
struct thread *td)
{
caddr_t bpos, dpos;
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(fdvp);
nfsstats.rpccnt[NFSPROC_RENAME]++;
mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME,
(NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
nfsm_rndup(tnamelen));
mb = mreq;
bpos = mtod(mb, caddr_t);
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, td, cred);
if (v3) {
nfsm_wcc_data(fdvp, fwccflag);
nfsm_wcc_data(tdvp, twccflag);
}
m_freem(mrep);
nfsmout:
mtx_lock(&(VTONFS(fdvp))->n_mtx);
VTONFS(fdvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(fdvp))->n_mtx);
mtx_lock(&(VTONFS(tdvp))->n_mtx);
VTONFS(tdvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(tdvp))->n_mtx);
if (!fwccflag) {
VTONFS(fdvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
}
if (!twccflag) {
VTONFS(tdvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
}
return (error);
}
/*
* nfs hard link create call
*/
static int
nfs_link(struct vop_link_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *cnp = ap->a_cnp;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
struct mbuf *mreq, *mrep, *md, *mb;
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, MNT_WAIT, cnp->cn_thread);
v3 = NFS_ISV3(vp);
nfsstats.rpccnt[NFSPROC_LINK]++;
mreq = nfsm_reqhead(vp, NFSPROC_LINK,
NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
mb = mreq;
bpos = mtod(mb, caddr_t);
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_thread, cnp->cn_cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
nfsm_wcc_data(tdvp, wccflag);
}
m_freem(mrep);
nfsmout:
mtx_lock(&(VTONFS(tdvp))->n_mtx);
VTONFS(tdvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(tdvp))->n_mtx);
if (!attrflag) {
VTONFS(vp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
}
if (!wccflag) {
VTONFS(tdvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
}
return (error);
}
/*
* nfs symbolic link create call
*/
static int
nfs_symlink(struct vop_symlink_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
caddr_t bpos, dpos;
int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
struct mbuf *mreq, *mrep, *md, *mb;
struct vnode *newvp = NULL;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
slen = strlen(ap->a_target);
mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
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) {
sp = nfsm_build(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_thread, 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.
*/
m_freem(mrep);
nfsmout:
/*
* If we do not have an error and we could not extract the newvp from
* the response due to the request being NFSv2, 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_thread, &np);
if (!error)
newvp = NFSTOV(np);
}
if (error) {
if (newvp)
vput(newvp);
} else {
*ap->a_vpp = newvp;
}
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(dvp))->n_mtx);
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
return (error);
}
/*
* nfs make dir call
*/
static int
nfs_mkdir(struct vop_mkdir_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
int len;
struct nfsnode *np = NULL;
struct vnode *newvp = NULL;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
int gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb;
struct vattr vattr;
int v3 = NFS_ISV3(dvp);
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
return (error);
len = cnp->cn_namelen;
nfsstats.rpccnt[NFSPROC_MKDIR]++;
mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
if (v3) {
nfsm_v3attrbuild(vap, FALSE);
} else {
sp = nfsm_build(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_thread, cnp->cn_cred);
if (!error)
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(mrep);
nfsmout:
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(dvp))->n_mtx);
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
if (error == 0 && newvp == NULL) {
error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
cnp->cn_thread, &np);
if (!error) {
newvp = NFSTOV(np);
if (newvp->v_type != VDIR)
error = EEXIST;
}
}
if (error) {
if (newvp)
vput(newvp);
} else
*ap->a_vpp = newvp;
return (error);
}
/*
* nfs remove directory call
*/
static int
nfs_rmdir(struct vop_rmdir_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
int v3 = NFS_ISV3(dvp);
if (dvp == vp)
return (EINVAL);
nfsstats.rpccnt[NFSPROC_RMDIR]++;
mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
if (v3)
nfsm_wcc_data(dvp, wccflag);
m_freem(mrep);
nfsmout:
mtx_lock(&(VTONFS(dvp))->n_mtx);
VTONFS(dvp)->n_flag |= NMODIFIED;
mtx_unlock(&(VTONFS(dvp))->n_mtx);
if (!wccflag) {
VTONFS(dvp)->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
}
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(struct vop_readdir_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct uio *uio = ap->a_uio;
int tresid, error = 0;
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 (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
mtx_lock(&np->n_mtx);
if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
mtx_unlock(&np->n_mtx);
nfsstats.direofcache_hits++;
goto out;
} else
mtx_unlock(&np->n_mtx);
}
}
/*
* 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++;
}
out:
return (error);
}
/*
* Readdir rpc call.
* Called from below the buffer cache by nfs_doio().
*/
int
nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
int len, left;
struct dirent *dp = NULL;
u_int32_t *tl;
caddr_t cp;
nfsuint64 *cookiep;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep, *md, *mb;
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.
*/
nfs_dircookie_lock(dnp);
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
if (cookiep) {
cookie = *cookiep;
nfs_dircookie_unlock(dnp);
} else {
nfs_dircookie_unlock(dnp);
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]++;
mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
NFSX_READDIR(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
if (v3) {
tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
mtx_lock(&dnp->n_mtx);
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
mtx_unlock(&dnp->n_mtx);
} else {
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
}
*tl = txdr_unsigned(nmp->nm_readdirsize);
nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
if (v3) {
nfsm_postop_attr(vp, attrflag);
if (!error) {
tl = nfsm_dissect(u_int32_t *,
2 * NFSX_UNSIGNED);
mtx_lock(&dnp->n_mtx);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl;
mtx_unlock(&dnp->n_mtx);
} else {
m_freem(mrep);
goto nfsmout;
}
}
tl = nfsm_dissect(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) {
tl = nfsm_dissect(u_int32_t *,
3 * NFSX_UNSIGNED);
fileno = fxdr_hyper(tl);
len = fxdr_unsigned(int, *(tl + 2));
} else {
tl = nfsm_dissect(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 =
(char *)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 =
(char *)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 =
(char *)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) {
tl = nfsm_dissect(u_int32_t *,
3 * NFSX_UNSIGNED);
} else {
tl = nfsm_dissect(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) {
tl = nfsm_dissect(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 =
(char *)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)
nfs_printf("EEK! readdirrpc resid > 0\n");
nfs_dircookie_lock(dnp);
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
*cookiep = cookie;
nfs_dircookie_unlock(dnp);
}
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 len, left;
struct dirent *dp;
u_int32_t *tl;
caddr_t cp;
struct vnode *newvp;
nfsuint64 *cookiep;
caddr_t bpos, dpos, dpossav1, dpossav2;
struct mbuf *mreq, *mrep, *md, *mb, *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 = NULL;
#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.
*/
nfs_dircookie_lock(dnp);
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
if (cookiep) {
cookie = *cookiep;
nfs_dircookie_unlock(dnp);
} else {
nfs_dircookie_unlock(dnp);
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]++;
mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
NFSX_FH(1) + 6 * NFSX_UNSIGNED);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, 1);
tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
*tl++ = cookie.nfsuquad[0];
*tl++ = cookie.nfsuquad[1];
mtx_lock(&dnp->n_mtx);
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
mtx_unlock(&dnp->n_mtx);
*tl++ = txdr_unsigned(nmp->nm_readdirsize);
*tl = txdr_unsigned(nmp->nm_rsize);
nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
nfsm_postop_attr(vp, attrflag);
if (error) {
m_freem(mrep);
goto nfsmout;
}
tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
mtx_lock(&dnp->n_mtx);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl++;
mtx_unlock(&dnp->n_mtx);
more_dirs = fxdr_unsigned(int, *tl);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
tl = nfsm_dissect(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 =
(char *)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 =
(char *)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 =
(char *)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));
tl = nfsm_dissect(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);
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
doit = fxdr_unsigned(int, *tl);
/*
* Skip loading the attrs for "..". There's a
* race between loading the attrs here and
* lookups that look for the directory currently
* being read (in the parent). We try to acquire
* the exclusive lock on ".." here, owning the
* lock on the directory being read. Lookup will
* hold the lock on ".." and try to acquire the
* lock on the directory being read.
*
* There are other ways of fixing this, one would
* be to do a trylock on the ".." vnode and skip
* loading the attrs on ".." if it happens to be
* locked by another process. But skipping the
* attrload on ".." seems the easiest option.
*/
if (strcmp(dp->d_name, "..") == 0) {
doit = 0;
/*
* We've already skipped over the attrs,
* skip over the filehandle. And store d_type
* as VDIR.
*/
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
nfsm_adv(nfsm_rndup(i));
dp->d_type = IFTODT(VTTOIF(VDIR));
}
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, LK_EXCLUSIVE);
if (error)
doit = 0;
else
newvp = NFSTOV(np);
}
}
if (doit && bigenough) {
dpossav2 = dpos;
dpos = dpossav1;
mdsav2 = md;
md = mdsav1;
nfsm_loadattr(newvp, NULL);
dpos = dpossav2;
md = mdsav2;
dp->d_type =
IFTODT(VTTOIF(np->n_vattr.va_type));
ndp->ni_vp = newvp;
/* Update n_ctime, so subsequent lookup doesn't purge entry */
np->n_ctime = np->n_vattr.va_ctime.tv_sec;
cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
}
} else {
/* Just skip over the file handle */
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
if (i) {
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
fhsize = fxdr_unsigned(int, *tl);
nfsm_adv(nfsm_rndup(fhsize));
}
}
if (newvp != NULLVP) {
if (newvp == vp)
vrele(newvp);
else
vput(newvp);
newvp = NULLVP;
}
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
tl = nfsm_dissect(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 =
(char *)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)
nfs_printf("EEK! readdirplusrpc resid > 0\n");
nfs_dircookie_lock(dnp);
cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
*cookiep = cookie;
nfs_dircookie_unlock(dnp);
}
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(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
struct sillyrename *sp;
struct nfsnode *np;
int error;
short pid;
unsigned int lticks;
cache_purge(dvp);
np = VTONFS(vp);
#ifndef DIAGNOSTIC
if (vp->v_type == VDIR)
panic("nfs: sillyrename dir");
#endif
sp = malloc(sizeof (struct sillyrename),
M_NFSREQ, M_WAITOK);
sp->s_cred = crhold(cnp->cn_cred);
sp->s_dvp = dvp;
sp->s_removeit = nfs_removeit;
VREF(dvp);
/*
* Fudge together a funny name.
* Changing the format of the funny name to accomodate more
* sillynames per directory.
* The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
* CPU ticks since boot.
*/
pid = cnp->cn_thread->td_proc->p_pid;
lticks = (unsigned int)ticks;
for ( ; ; ) {
sp->s_namlen = sprintf(sp->s_name,
".nfs.%08x.%04x4.4", lticks,
pid);
if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_thread, NULL))
break;
lticks++;
}
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_thread, &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(struct vnode *dvp, const char *name, int len, struct ucred *cred,
struct thread *td, struct nfsnode **npp)
{
struct vnode *newvp = NULL;
struct nfsnode *np, *dnp = VTONFS(dvp);
caddr_t bpos, dpos;
int error = 0, fhlen, attrflag;
struct mbuf *mreq, *mrep, *md, *mb;
nfsfh_t *nfhp;
int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(dvp, v3);
nfsm_strtom(name, len, NFS_MAXNAMLEN);
nfsm_request(dvp, NFSPROC_LOOKUP, td, 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, LK_EXCLUSIVE);
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, NULL);
}
m_freem(mrep);
nfsmout:
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(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
struct thread *td)
{
u_int32_t *tl;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
caddr_t bpos, dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
mtx_lock(&nmp->nm_mtx);
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
mtx_unlock(&nmp->nm_mtx);
return (0);
}
mtx_unlock(&nmp->nm_mtx);
nfsstats.rpccnt[NFSPROC_COMMIT]++;
mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, 1);
tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
txdr_hyper(offset, tl);
tl += 2;
*tl = txdr_unsigned(cnt);
nfsm_request(vp, NFSPROC_COMMIT, td, cred);
nfsm_wcc_data(vp, wccflag);
if (!error) {
tl = nfsm_dissect(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(mrep);
nfsmout:
return (error);
}
/*
* 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(struct vop_strategy_args *ap)
{
struct buf *bp = ap->a_bp;
struct ucred *cr;
KASSERT(!(bp->b_flags & B_DONE),
("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
BUF_ASSERT_HELD(bp);
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(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
(void)nfs_doio(ap->a_vp, bp, cr, curthread);
return (0);
}
/*
* fsync vnode op. Just call nfs_flush() with commit == 1.
*/
/* ARGSUSED */
static int
nfs_fsync(struct vop_fsync_args *ap)
{
return (nfs_flush(ap->a_vp, ap->a_waitfor, 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(struct vnode *vp, int waitfor, int commit)
{
struct nfsnode *np = VTONFS(vp);
struct buf *bp;
int i;
struct buf *nbp;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int 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;
struct bufobj *bo;
struct thread *td = curthread;
#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 = NFS_PCATCH;
if (!commit)
passone = 0;
bo = &vp->v_bufobj;
/*
* A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
* server, but has 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) {
if (bvec != NULL && bvec != bvec_on_stack)
free(bvec, M_TEMP);
/*
* Count up how many buffers waiting for a commit.
*/
bveccount = 0;
BO_LOCK(bo);
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
if (!BUF_ISLOCKED(bp) &&
(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) {
/*
* Release the vnode interlock to avoid a lock
* order reversal.
*/
BO_UNLOCK(bo);
bvec = (struct buf **)
malloc(bveccount * sizeof(struct buf *),
M_TEMP, M_NOWAIT);
BO_LOCK(bo);
if (bvec == NULL) {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
} else
bvecsize = bveccount;
} else {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
}
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
if (bvecpos >= bvecsize)
break;
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
nbp = TAILQ_NEXT(bp, b_bobufs);
continue;
}
if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
(B_DELWRI | B_NEEDCOMMIT)) {
BUF_UNLOCK(bp);
nbp = TAILQ_NEXT(bp, b_bobufs);
continue;
}
BO_UNLOCK(bo);
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.
*
* Note: to avoid loopback deadlocks, we do not
* assign b_runningbufspace.
*/
if (wcred == NULL)
wcred = bp->b_wcred;
else if (wcred != bp->b_wcred)
wcred = NOCRED;
vfs_busy_pages(bp, 1);
BO_LOCK(bo);
/*
* 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_bobufs);
/*
* 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;
}
BO_UNLOCK(bo);
}
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, td);
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, td);
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_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
*/
bufobj_wref(bo);
bp->b_flags |= B_ASYNC;
bundirty(bp);
bp->b_flags &= ~B_DONE;
bp->b_ioflags &= ~BIO_ERROR;
bp->b_dirtyoff = bp->b_dirtyend = 0;
bufdone(bp);
}
}
}
/*
* Start/do any write(s) that are required.
*/
loop:
BO_LOCK(bo);
TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
if (waitfor != MNT_WAIT || passone)
continue;
error = BUF_TIMELOCK(bp,
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
BO_MTX(bo), "nfsfsync", slpflag, slptimeo);
if (error == 0) {
BUF_UNLOCK(bp);
goto loop;
}
if (error == ENOLCK) {
error = 0;
goto loop;
}
if (nfs_sigintr(nmp, td)) {
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;
}
BO_UNLOCK(bo);
bremfree(bp);
if (passone || !commit)
bp->b_flags |= B_ASYNC;
else
bp->b_flags |= B_ASYNC;
bwrite(bp);
if (nfs_sigintr(nmp, td)) {
error = EINTR;
goto done;
}
goto loop;
}
if (passone) {
passone = 0;
BO_UNLOCK(bo);
goto again;
}
if (waitfor == MNT_WAIT) {
while (bo->bo_numoutput) {
error = bufobj_wwait(bo, slpflag, slptimeo);
if (error) {
BO_UNLOCK(bo);
error = nfs_sigintr(nmp, td);
if (error)
goto done;
if (slpflag & PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
BO_LOCK(bo);
}
}
if (bo->bo_dirty.bv_cnt != 0 && commit) {
BO_UNLOCK(bo);
goto loop;
}
/*
* Wait for all the async IO requests to drain
*/
BO_UNLOCK(bo);
mtx_lock(&np->n_mtx);
while (np->n_directio_asyncwr > 0) {
np->n_flag |= NFSYNCWAIT;
error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr,
&np->n_mtx, slpflag | (PRIBIO + 1),
"nfsfsync", 0);
if (error) {
if (nfs_sigintr(nmp, td)) {
mtx_unlock(&np->n_mtx);
error = EINTR;
goto done;
}
}
}
mtx_unlock(&np->n_mtx);
} else
BO_UNLOCK(bo);
mtx_lock(&np->n_mtx);
if (np->n_flag & NWRITEERR) {
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
if (commit && bo->bo_dirty.bv_cnt == 0 &&
bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
np->n_flag &= ~NMODIFIED;
mtx_unlock(&np->n_mtx);
done:
if (bvec != NULL && bvec != bvec_on_stack)
free(bvec, M_TEMP);
return (error);
}
/*
* NFS advisory byte-level locks.
*/
static int
nfs_advlock(struct vop_advlock_args *ap)
{
struct vnode *vp = ap->a_vp;
u_quad_t size;
int error;
error = vn_lock(vp, LK_SHARED);
if (error)
return (error);
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
size = VTONFS(vp)->n_size;
VOP_UNLOCK(vp, 0);
error = lf_advlock(ap, &(vp->v_lockf), size);
} else {
if (nfs_advlock_p)
error = nfs_advlock_p(ap);
else
error = ENOLCK;
}
return (error);
}
/*
* NFS advisory byte-level locks.
*/
static int
nfs_advlockasync(struct vop_advlockasync_args *ap)
{
struct vnode *vp = ap->a_vp;
u_quad_t size;
int error;
error = vn_lock(vp, LK_SHARED);
if (error)
return (error);
if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
size = VTONFS(vp)->n_size;
VOP_UNLOCK(vp, 0);
error = lf_advlockasync(ap, &(vp->v_lockf), size);
} else {
VOP_UNLOCK(vp, 0);
error = EOPNOTSUPP;
}
return (error);
}
/*
* Print out the contents of an nfsnode.
*/
static int
nfs_print(struct vop_print_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
nfs_printf("\tfileid %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);
}
/*
* This is the "real" nfs::bwrite(struct buf*).
* We set B_CACHE if this is a VMIO buffer.
*/
int
nfs_writebp(struct buf *bp, int force __unused, struct thread *td)
{
int s;
int oldflags = bp->b_flags;
#if 0
int retv = 1;
off_t off;
#endif
BUF_ASSERT_HELD(bp);
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;
bufobj_wref(bp->b_bufobj);
curthread->td_ru.ru_oublock++;
splx(s);
/*
* Note: to avoid loopback deadlocks, we do not
* assign b_runningbufspace.
*/
vfs_busy_pages(bp, 1);
BUF_KERNPROC(bp);
bp->b_iooffset = dbtob(bp->b_blkno);
bstrategy(bp);
if( (oldflags & B_ASYNC) == 0) {
int rtval = bufwait(bp);
if (oldflags & B_DELWRI) {
s = splbio();
reassignbuf(bp);
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(struct vop_access_args *ap)
{
struct vattr *vap;
struct ucred *cred = ap->a_cred;
struct vnode *vp = ap->a_vp;
accmode_t accmode = ap->a_accmode;
struct vattr vattr;
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 ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}
vap = &vattr;
error = VOP_GETATTR(vp, vap, cred);
if (error)
goto out;
error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
accmode, cred, NULL);
out:
return error;
}
/*
* Read wrapper for fifos.
*/
static int
nfsfifo_read(struct vop_read_args *ap)
{
struct nfsnode *np = VTONFS(ap->a_vp);
int error;
/*
* Set access flag.
*/
mtx_lock(&np->n_mtx);
np->n_flag |= NACC;
getnanotime(&np->n_atim);
mtx_unlock(&np->n_mtx);
error = fifo_specops.vop_read(ap);
return error;
}
/*
* Write wrapper for fifos.
*/
static int
nfsfifo_write(struct vop_write_args *ap)
{
struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set update flag.
*/
mtx_lock(&np->n_mtx);
np->n_flag |= NUPD;
getnanotime(&np->n_mtim);
mtx_unlock(&np->n_mtx);
return(fifo_specops.vop_write(ap));
}
/*
* Close wrapper for fifos.
*
* Update the times on the nfsnode then do fifo close.
*/
static int
nfsfifo_close(struct vop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct vattr vattr;
struct timespec ts;
mtx_lock(&np->n_mtx);
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 (vrefcnt(vp) == 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;
mtx_unlock(&np->n_mtx);
(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
goto out;
}
}
mtx_unlock(&np->n_mtx);
out:
return (fifo_specops.vop_close(ap));
}
/*
* 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(struct buf *bp)
{
return (nfs_writebp(bp, 1, curthread));
}
struct buf_ops buf_ops_nfs = {
.bop_name = "buf_ops_nfs",
.bop_write = nfs_bwrite,
.bop_strategy = bufstrategy,
.bop_sync = bufsync,
.bop_bdflush = bufbdflush,
};
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