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freebsd-nq/sys/nfsclient/nfs_subs.c
Attilio Rao d638e093d6 - Introduce the function lockmgr_recursed() which returns true if the 
lockmgr lkp, when held in exclusive mode, is recursed
- Introduce the function BUF_RECURSED() which does the same for bufobj
  locks based on the top of lockmgr_recursed()
- Introduce the function BUF_ISLOCKED() which works like the counterpart
  VOP_ISLOCKED(9), showing the state of lockmgr linked with the bufobj

BUF_RECURSED() and BUF_ISLOCKED() entirely replace the usage of bogus
BUF_REFCNT() in a more explicative and SMP-compliant way.
This allows us to axe out BUF_REFCNT() and leaving the function
lockcount() totally unused in our stock kernel. Further commits will
axe lockcount() as well as part of lockmgr() cleanup.

KPI results, obviously, broken so further commits will update manpages
and freebsd version.

Tested by: kris (on UFS and NFS)
2008-01-19 17:36:23 +00:00

1188 lines
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/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 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_subs.c 8.8 (Berkeley) 5/22/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* These functions support the macros and help fiddle mbuf chains for
* the nfs op functions. They do things like create the rpc header and
* copy data between mbuf chains and uio lists.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/sysproto.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
#include <rpc/rpcclnt.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsnode.h>
#include <nfs/xdr_subs.h>
#include <nfsclient/nfsm_subs.h>
#include <nfsclient/nfsmount.h>
#include <netinet/in.h>
/*
* Note that stdarg.h and the ANSI style va_start macro is used for both
* ANSI and traditional C compilers.
*/
#include <machine/stdarg.h>
/*
* Data items converted to xdr at startup, since they are constant
* This is kinda hokey, but may save a little time doing byte swaps
*/
u_int32_t nfs_xdrneg1;
u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
rpc_mismatch, rpc_auth_unix, rpc_msgaccepted;
u_int32_t nfs_true, nfs_false;
/* And other global data */
u_int32_t nfs_xid = 0;
static enum vtype nv2tov_type[8]= {
VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
};
int nfs_ticks;
int nfs_pbuf_freecnt = -1; /* start out unlimited */
struct nfs_reqq nfs_reqq;
struct mtx nfs_reqq_mtx;
struct nfs_bufq nfs_bufq;
struct mtx nfs_xid_mtx;
/*
* and the reverse mapping from generic to Version 2 procedure numbers
*/
int nfsv2_procid[NFS_NPROCS] = {
NFSV2PROC_NULL,
NFSV2PROC_GETATTR,
NFSV2PROC_SETATTR,
NFSV2PROC_LOOKUP,
NFSV2PROC_NOOP,
NFSV2PROC_READLINK,
NFSV2PROC_READ,
NFSV2PROC_WRITE,
NFSV2PROC_CREATE,
NFSV2PROC_MKDIR,
NFSV2PROC_SYMLINK,
NFSV2PROC_CREATE,
NFSV2PROC_REMOVE,
NFSV2PROC_RMDIR,
NFSV2PROC_RENAME,
NFSV2PROC_LINK,
NFSV2PROC_READDIR,
NFSV2PROC_NOOP,
NFSV2PROC_STATFS,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
};
LIST_HEAD(nfsnodehashhead, nfsnode);
/*
* Create the header for an rpc request packet
* The hsiz is the size of the rest of the nfs request header.
* (just used to decide if a cluster is a good idea)
*/
struct mbuf *
nfsm_reqhead(struct vnode *vp, u_long procid, int hsiz)
{
struct mbuf *mb;
MGET(mb, M_TRYWAIT, MT_DATA);
if (hsiz >= MINCLSIZE)
MCLGET(mb, M_TRYWAIT);
mb->m_len = 0;
return (mb);
}
/*
* Build the RPC header and fill in the authorization info.
* The authorization string argument is only used when the credentials
* come from outside of the kernel.
* Returns the head of the mbuf list.
*/
struct mbuf *
nfsm_rpchead(struct ucred *cr, int nmflag, int procid, int auth_type,
int auth_len, struct mbuf *mrest, int mrest_len, struct mbuf **mbp,
u_int32_t **xidpp)
{
struct mbuf *mb;
u_int32_t *tl;
caddr_t bpos;
int i;
struct mbuf *mreq;
int grpsiz, authsiz;
authsiz = nfsm_rndup(auth_len);
MGETHDR(mb, M_TRYWAIT, MT_DATA);
if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
MCLGET(mb, M_TRYWAIT);
} else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
} else {
MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
}
mb->m_len = 0;
mreq = mb;
bpos = mtod(mb, caddr_t);
/*
* First the RPC header.
*/
tl = nfsm_build(u_int32_t *, 8 * NFSX_UNSIGNED);
mtx_lock(&nfs_xid_mtx);
/* Get a pretty random xid to start with */
if (!nfs_xid)
nfs_xid = random();
/*
* Skip zero xid if it should ever happen.
*/
if (++nfs_xid == 0)
nfs_xid++;
*xidpp = tl;
*tl++ = txdr_unsigned(nfs_xid);
mtx_unlock(&nfs_xid_mtx);
*tl++ = rpc_call;
*tl++ = rpc_vers;
*tl++ = txdr_unsigned(NFS_PROG);
if (nmflag & NFSMNT_NFSV3) {
*tl++ = txdr_unsigned(NFS_VER3);
*tl++ = txdr_unsigned(procid);
} else {
*tl++ = txdr_unsigned(NFS_VER2);
*tl++ = txdr_unsigned(nfsv2_procid[procid]);
}
/*
* And then the authorization cred.
*/
*tl++ = txdr_unsigned(auth_type);
*tl = txdr_unsigned(authsiz);
switch (auth_type) {
case RPCAUTH_UNIX:
tl = nfsm_build(u_int32_t *, auth_len);
*tl++ = 0; /* stamp ?? */
*tl++ = 0; /* NULL hostname */
*tl++ = txdr_unsigned(cr->cr_uid);
*tl++ = txdr_unsigned(cr->cr_groups[0]);
grpsiz = (auth_len >> 2) - 5;
*tl++ = txdr_unsigned(grpsiz);
for (i = 1; i <= grpsiz; i++)
*tl++ = txdr_unsigned(cr->cr_groups[i]);
break;
}
/*
* And the verifier...
*/
tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(RPCAUTH_NULL);
*tl = 0;
mb->m_next = mrest;
mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
mreq->m_pkthdr.rcvif = NULL;
*mbp = mb;
return (mreq);
}
/*
* copies a uio scatter/gather list to an mbuf chain.
* NOTE: can ony handle iovcnt == 1
*/
int
nfsm_uiotombuf(struct uio *uiop, struct mbuf **mq, int siz, caddr_t *bpos)
{
char *uiocp;
struct mbuf *mp, *mp2;
int xfer, left, mlen;
int uiosiz, clflg, rem;
char *cp;
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfsm_uiotombuf: iovcnt != 1");
#endif
if (siz > MLEN) /* or should it >= MCLBYTES ?? */
clflg = 1;
else
clflg = 0;
rem = nfsm_rndup(siz)-siz;
mp = mp2 = *mq;
while (siz > 0) {
left = uiop->uio_iov->iov_len;
uiocp = uiop->uio_iov->iov_base;
if (left > siz)
left = siz;
uiosiz = left;
while (left > 0) {
mlen = M_TRAILINGSPACE(mp);
if (mlen == 0) {
MGET(mp, M_TRYWAIT, MT_DATA);
if (clflg)
MCLGET(mp, M_TRYWAIT);
mp->m_len = 0;
mp2->m_next = mp;
mp2 = mp;
mlen = M_TRAILINGSPACE(mp);
}
xfer = (left > mlen) ? mlen : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
mp->m_len += xfer;
left -= xfer;
uiocp += xfer;
uiop->uio_offset += xfer;
uiop->uio_resid -= xfer;
}
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base + uiosiz;
uiop->uio_iov->iov_len -= uiosiz;
siz -= uiosiz;
}
if (rem > 0) {
if (rem > M_TRAILINGSPACE(mp)) {
MGET(mp, M_TRYWAIT, MT_DATA);
mp->m_len = 0;
mp2->m_next = mp;
}
cp = mtod(mp, caddr_t)+mp->m_len;
for (left = 0; left < rem; left++)
*cp++ = '\0';
mp->m_len += rem;
*bpos = cp;
} else
*bpos = mtod(mp, caddr_t)+mp->m_len;
*mq = mp;
return (0);
}
/*
* Copy a string into mbufs for the hard cases...
*/
int
nfsm_strtmbuf(struct mbuf **mb, char **bpos, const char *cp, long siz)
{
struct mbuf *m1 = NULL, *m2;
long left, xfer, len, tlen;
u_int32_t *tl;
int putsize;
putsize = 1;
m2 = *mb;
left = M_TRAILINGSPACE(m2);
if (left > 0) {
tl = ((u_int32_t *)(*bpos));
*tl++ = txdr_unsigned(siz);
putsize = 0;
left -= NFSX_UNSIGNED;
m2->m_len += NFSX_UNSIGNED;
if (left > 0) {
bcopy(cp, (caddr_t) tl, left);
siz -= left;
cp += left;
m2->m_len += left;
left = 0;
}
}
/* Loop around adding mbufs */
while (siz > 0) {
MGET(m1, M_TRYWAIT, MT_DATA);
if (siz > MLEN)
MCLGET(m1, M_TRYWAIT);
m1->m_len = NFSMSIZ(m1);
m2->m_next = m1;
m2 = m1;
tl = mtod(m1, u_int32_t *);
tlen = 0;
if (putsize) {
*tl++ = txdr_unsigned(siz);
m1->m_len -= NFSX_UNSIGNED;
tlen = NFSX_UNSIGNED;
putsize = 0;
}
if (siz < m1->m_len) {
len = nfsm_rndup(siz);
xfer = siz;
if (xfer < len)
*(tl+(xfer>>2)) = 0;
} else {
xfer = len = m1->m_len;
}
bcopy(cp, (caddr_t) tl, xfer);
m1->m_len = len+tlen;
siz -= xfer;
cp += xfer;
}
*mb = m1;
*bpos = mtod(m1, caddr_t)+m1->m_len;
return (0);
}
/*
* Called once to initialize data structures...
*/
int
nfs_init(struct vfsconf *vfsp)
{
int i;
nfsmount_zone = uma_zcreate("NFSMOUNT", sizeof(struct nfsmount),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
rpc_vers = txdr_unsigned(RPC_VER2);
rpc_call = txdr_unsigned(RPC_CALL);
rpc_reply = txdr_unsigned(RPC_REPLY);
rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
rpc_autherr = txdr_unsigned(RPC_AUTHERR);
rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
nfs_true = txdr_unsigned(TRUE);
nfs_false = txdr_unsigned(FALSE);
nfs_xdrneg1 = txdr_unsigned(-1);
nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
if (nfs_ticks < 1)
nfs_ticks = 1;
/* Ensure async daemons disabled */
for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
nfs_iodwant[i] = NULL;
nfs_iodmount[i] = NULL;
}
nfs_nhinit(); /* Init the nfsnode table */
/*
* Initialize reply list and start timer
*/
TAILQ_INIT(&nfs_reqq);
callout_init(&nfs_callout, CALLOUT_MPSAFE);
mtx_init(&nfs_reqq_mtx, "NFS reqq lock", NULL, MTX_DEF);
mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
nfs_pbuf_freecnt = nswbuf / 2 + 1;
return (0);
}
int
nfs_uninit(struct vfsconf *vfsp)
{
int i;
callout_stop(&nfs_callout);
KASSERT(TAILQ_EMPTY(&nfs_reqq),
("nfs_uninit: request queue not empty"));
/*
* Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
* any sleeping nfsiods so they check nfs_iodmax and exit.
*/
mtx_lock(&nfs_iod_mtx);
nfs_iodmax = 0;
for (i = 0; i < nfs_numasync; i++)
if (nfs_iodwant[i])
wakeup(&nfs_iodwant[i]);
/* The last nfsiod to exit will wake us up when nfs_numasync hits 0 */
while (nfs_numasync)
msleep(&nfs_numasync, &nfs_iod_mtx, PWAIT, "ioddie", 0);
mtx_unlock(&nfs_iod_mtx);
nfs_nhuninit();
uma_zdestroy(nfsmount_zone);
return (0);
}
void
nfs_dircookie_lock(struct nfsnode *np)
{
mtx_lock(&np->n_mtx);
while (np->n_flag & NDIRCOOKIELK)
(void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
np->n_flag |= NDIRCOOKIELK;
mtx_unlock(&np->n_mtx);
}
void
nfs_dircookie_unlock(struct nfsnode *np)
{
mtx_lock(&np->n_mtx);
np->n_flag &= ~NDIRCOOKIELK;
wakeup(&np->n_flag);
mtx_unlock(&np->n_mtx);
}
int
nfs_upgrade_vnlock(struct vnode *vp, struct thread *td)
{
int old_lock;
if ((old_lock = VOP_ISLOCKED(vp, td)) != LK_EXCLUSIVE) {
if (old_lock == LK_SHARED) {
/* Upgrade to exclusive lock, this might block */
vn_lock(vp, LK_UPGRADE | LK_RETRY);
} else {
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
}
return old_lock;
}
void
nfs_downgrade_vnlock(struct vnode *vp, struct thread *td, int old_lock)
{
if (old_lock != LK_EXCLUSIVE) {
if (old_lock == LK_SHARED) {
/* Downgrade from exclusive lock, this might block */
vn_lock(vp, LK_DOWNGRADE);
} else {
VOP_UNLOCK(vp, 0);
}
}
}
void
nfs_printf(const char *fmt, ...)
{
va_list ap;
mtx_lock(&Giant);
va_start(ap, fmt);
printf(fmt, ap);
va_end(ap);
mtx_unlock(&Giant);
}
/*
* Attribute cache routines.
* nfs_loadattrcache() - loads or updates the cache contents from attributes
* that are on the mbuf list
* nfs_getattrcache() - returns valid attributes if found in cache, returns
* error otherwise
*/
/*
* Load the attribute cache (that lives in the nfsnode entry) with
* the values on the mbuf list and
* Iff vap not NULL
* copy the attributes to *vaper
*/
int
nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
struct vattr *vaper, int dontshrink)
{
struct vnode *vp = *vpp;
struct vattr *vap;
struct nfs_fattr *fp;
struct nfsnode *np;
int32_t t1;
caddr_t cp2;
int rdev;
struct mbuf *md;
enum vtype vtyp;
u_short vmode;
struct timespec mtime, mtime_save;
int v3 = NFS_ISV3(vp);
struct thread *td = curthread;
md = *mdp;
t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_TRYWAIT);
if (cp2 == NULL)
return EBADRPC;
fp = (struct nfs_fattr *)cp2;
if (v3) {
vtyp = nfsv3tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
rdev = makedev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
fxdr_unsigned(int, fp->fa3_rdev.specdata2));
fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
} else {
vtyp = nfsv2tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
/*
* XXX
*
* The duplicate information returned in fa_type and fa_mode
* is an ambiguity in the NFS version 2 protocol.
*
* VREG should be taken literally as a regular file. If a
* server intents to return some type information differently
* in the upper bits of the mode field (e.g. for sockets, or
* FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
* leave the examination of the mode bits even in the VREG
* case to avoid breakage for bogus servers, but we make sure
* that there are actually type bits set in the upper part of
* fa_mode (and failing that, trust the va_type field).
*
* NFSv3 cleared the issue, and requires fa_mode to not
* contain any type information (while also introduing sockets
* and FIFOs for fa_type).
*/
if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
vtyp = IFTOVT(vmode);
rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
/*
* Really ugly NFSv2 kludge.
*/
if (vtyp == VCHR && rdev == 0xffffffff)
vtyp = VFIFO;
}
/*
* If v_type == VNON it is a new node, so fill in the v_type,
* n_mtime fields. Check to see if it represents a special
* device, and if so, check for a possible alias. Once the
* correct vnode has been obtained, fill in the rest of the
* information.
*/
np = VTONFS(vp);
mtx_lock(&np->n_mtx);
if (vp->v_type != vtyp) {
vp->v_type = vtyp;
if (vp->v_type == VFIFO)
vp->v_op = &nfs_fifoops;
np->n_mtime = mtime;
}
vap = &np->n_vattr;
vap->va_type = vtyp;
vap->va_mode = (vmode & 07777);
vap->va_rdev = rdev;
mtime_save = vap->va_mtime;
vap->va_mtime = mtime;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
if (v3) {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
vap->va_size = fxdr_hyper(&fp->fa3_size);
vap->va_blocksize = NFS_FABLKSIZE;
vap->va_bytes = fxdr_hyper(&fp->fa3_used);
vap->va_fileid = fxdr_unsigned(int32_t,
fp->fa3_fileid.nfsuquad[1]);
fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
vap->va_flags = 0;
vap->va_filerev = 0;
} else {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
* NFS_FABLKSIZE;
vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
vap->va_flags = 0;
vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
fp->fa2_ctime.nfsv2_sec);
vap->va_ctime.tv_nsec = 0;
vap->va_gen = fxdr_unsigned(u_int32_t, fp->fa2_ctime.nfsv2_usec);
vap->va_filerev = 0;
}
np->n_attrstamp = time_second;
/* Timestamp the NFS otw getattr fetch */
if (td->td_proc) {
np->n_ac_ts_tid = td->td_tid;
np->n_ac_ts_pid = td->td_proc->p_pid;
np->n_ac_ts_syscalls = td->td_syscalls;
} else
bzero(&np->n_ac_ts, sizeof(struct nfs_attrcache_timestamp));
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (dontshrink && vap->va_size < np->n_size) {
/*
* We've been told not to shrink the file;
* zero np->n_attrstamp to indicate that
* the attributes are stale.
*/
vap->va_size = np->n_size;
np->n_attrstamp = 0;
} else if (np->n_flag & NMODIFIED) {
/*
* We've modified the file: Use the larger
* of our size, and the server's size.
*/
if (vap->va_size < np->n_size) {
vap->va_size = np->n_size;
} else {
np->n_size = vap->va_size;
np->n_flag |= NSIZECHANGED;
}
} else {
np->n_size = vap->va_size;
np->n_flag |= NSIZECHANGED;
}
vnode_pager_setsize(vp, np->n_size);
} else {
np->n_size = vap->va_size;
}
}
/*
* The following checks are added to prevent a race between (say)
* a READDIR+ and a WRITE.
* READDIR+, WRITE requests sent out.
* READDIR+ resp, WRITE resp received on client.
* However, the WRITE resp was handled before the READDIR+ resp
* causing the post op attrs from the write to be loaded first
* and the attrs from the READDIR+ to be loaded later. If this
* happens, we have stale attrs loaded into the attrcache.
* We detect this by for the mtime moving back. We invalidate the
* attrcache when this happens.
*/
if (timespeccmp(&mtime_save, &vap->va_mtime, >))
/* Size changed or mtime went backwards */
np->n_attrstamp = 0;
if (vaper != NULL) {
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
}
mtx_unlock(&np->n_mtx);
return (0);
}
#ifdef NFS_ACDEBUG
#include <sys/sysctl.h>
SYSCTL_DECL(_vfs_nfs);
static int nfs_acdebug;
SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
#endif
/*
* Check the time stamp
* If the cache is valid, copy contents to *vap and return 0
* otherwise return an error
*/
int
nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
{
struct nfsnode *np;
struct vattr *vap;
struct nfsmount *nmp;
int timeo;
np = VTONFS(vp);
vap = &np->n_vattr;
nmp = VFSTONFS(vp->v_mount);
#ifdef NFS_ACDEBUG
mtx_lock(&Giant); /* nfs_printf() */
#endif
mtx_lock(&np->n_mtx);
/* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
timeo = (time_second - np->n_mtime.tv_sec) / 10;
#ifdef NFS_ACDEBUG
if (nfs_acdebug>1)
nfs_printf("nfs_getattrcache: initial timeo = %d\n", timeo);
#endif
if (vap->va_type == VDIR) {
if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
timeo = nmp->nm_acdirmin;
else if (timeo > nmp->nm_acdirmax)
timeo = nmp->nm_acdirmax;
} else {
if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
timeo = nmp->nm_acregmin;
else if (timeo > nmp->nm_acregmax)
timeo = nmp->nm_acregmax;
}
#ifdef NFS_ACDEBUG
if (nfs_acdebug > 2)
nfs_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
nmp->nm_acregmin, nmp->nm_acregmax,
nmp->nm_acdirmin, nmp->nm_acdirmax);
if (nfs_acdebug)
nfs_printf("nfs_getattrcache: age = %d; final timeo = %d\n",
(time_second - np->n_attrstamp), timeo);
#endif
if ((time_second - np->n_attrstamp) >= timeo) {
nfsstats.attrcache_misses++;
mtx_unlock(&np->n_mtx);
return( ENOENT);
}
nfsstats.attrcache_hits++;
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (np->n_flag & NMODIFIED) {
if (vap->va_size < np->n_size)
vap->va_size = np->n_size;
else
np->n_size = vap->va_size;
} else {
np->n_size = vap->va_size;
}
vnode_pager_setsize(vp, np->n_size);
} else {
np->n_size = vap->va_size;
}
}
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
mtx_unlock(&np->n_mtx);
#ifdef NFS_ACDEBUG
mtx_unlock(&Giant); /* nfs_printf() */
#endif
return (0);
}
static nfsuint64 nfs_nullcookie = { { 0, 0 } };
/*
* This function finds the directory cookie that corresponds to the
* logical byte offset given.
*/
nfsuint64 *
nfs_getcookie(struct nfsnode *np, off_t off, int add)
{
struct nfsdmap *dp, *dp2;
int pos;
nfsuint64 *retval = NULL;
pos = (uoff_t)off / NFS_DIRBLKSIZ;
if (pos == 0 || off < 0) {
#ifdef DIAGNOSTIC
if (add)
panic("nfs getcookie add at <= 0");
#endif
return (&nfs_nullcookie);
}
pos--;
dp = LIST_FIRST(&np->n_cookies);
if (!dp) {
if (add) {
MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
M_NFSDIROFF, M_WAITOK);
dp->ndm_eocookie = 0;
LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
} else
goto out;
}
while (pos >= NFSNUMCOOKIES) {
pos -= NFSNUMCOOKIES;
if (LIST_NEXT(dp, ndm_list)) {
if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
pos >= dp->ndm_eocookie)
goto out;
dp = LIST_NEXT(dp, ndm_list);
} else if (add) {
MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
M_NFSDIROFF, M_WAITOK);
dp2->ndm_eocookie = 0;
LIST_INSERT_AFTER(dp, dp2, ndm_list);
dp = dp2;
} else
goto out;
}
if (pos >= dp->ndm_eocookie) {
if (add)
dp->ndm_eocookie = pos + 1;
else
goto out;
}
retval = &dp->ndm_cookies[pos];
out:
return (retval);
}
/*
* Invalidate cached directory information, except for the actual directory
* blocks (which are invalidated separately).
* Done mainly to avoid the use of stale offset cookies.
*/
void
nfs_invaldir(struct vnode *vp)
{
struct nfsnode *np = VTONFS(vp);
#ifdef DIAGNOSTIC
if (vp->v_type != VDIR)
panic("nfs: invaldir not dir");
#endif
nfs_dircookie_lock(np);
np->n_direofoffset = 0;
np->n_cookieverf.nfsuquad[0] = 0;
np->n_cookieverf.nfsuquad[1] = 0;
if (LIST_FIRST(&np->n_cookies))
LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
nfs_dircookie_unlock(np);
}
/*
* The write verifier has changed (probably due to a server reboot), so all
* B_NEEDCOMMIT blocks will have to be written again. Since they are on the
* dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
* and B_CLUSTEROK flags. Once done the new write verifier can be set for the
* mount point.
*
* B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
* writes are not clusterable.
*/
void
nfs_clearcommit(struct mount *mp)
{
struct vnode *vp, *nvp;
struct buf *bp, *nbp;
int s;
s = splbio();
MNT_ILOCK(mp);
MNT_VNODE_FOREACH(vp, mp, nvp) {
VI_LOCK(vp);
if (vp->v_iflag & VI_DOOMED) {
VI_UNLOCK(vp);
continue;
}
MNT_IUNLOCK(mp);
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
if (!BUF_ISLOCKED(bp) &&
(bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
== (B_DELWRI | B_NEEDCOMMIT))
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
}
VI_UNLOCK(vp);
MNT_ILOCK(mp);
}
MNT_IUNLOCK(mp);
splx(s);
}
/*
* Helper functions for former macros. Some of these should be
* moved to their callers.
*/
int
nfsm_mtofh_xx(struct vnode *d, struct vnode **v, int v3, int *f,
struct mbuf **md, caddr_t *dpos)
{
struct nfsnode *ttnp;
struct vnode *ttvp;
nfsfh_t *ttfhp;
u_int32_t *tl;
int ttfhsize;
int t1;
if (v3) {
tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*f = fxdr_unsigned(int, *tl);
} else
*f = 1;
if (*f) {
t1 = nfsm_getfh_xx(&ttfhp, &ttfhsize, (v3), md, dpos);
if (t1 != 0)
return t1;
t1 = nfs_nget(d->v_mount, ttfhp, ttfhsize, &ttnp, LK_EXCLUSIVE);
if (t1 != 0)
return t1;
*v = NFSTOV(ttnp);
}
if (v3) {
tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*f)
*f = fxdr_unsigned(int, *tl);
else if (fxdr_unsigned(int, *tl))
nfsm_adv_xx(NFSX_V3FATTR, md, dpos);
}
if (*f) {
ttvp = *v;
t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 0);
if (t1)
return t1;
*v = ttvp;
}
return 0;
}
int
nfsm_getfh_xx(nfsfh_t **f, int *s, int v3, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
if (v3) {
tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*s = fxdr_unsigned(int, *tl);
if (*s <= 0 || *s > NFSX_V3FHMAX)
return EBADRPC;
} else
*s = NFSX_V2FH;
*f = nfsm_dissect_xx(nfsm_rndup(*s), md, dpos);
if (*f == NULL)
return EBADRPC;
else
return 0;
}
int
nfsm_loadattr_xx(struct vnode **v, struct vattr *va, struct mbuf **md,
caddr_t *dpos)
{
int t1;
struct vnode *ttvp = *v;
t1 = nfs_loadattrcache(&ttvp, md, dpos, va, 0);
if (t1 != 0)
return t1;
*v = ttvp;
return 0;
}
int
nfsm_postop_attr_xx(struct vnode **v, int *f, struct mbuf **md,
caddr_t *dpos)
{
u_int32_t *tl;
int t1;
struct vnode *ttvp = *v;
tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*f = fxdr_unsigned(int, *tl);
if (*f != 0) {
t1 = nfs_loadattrcache(&ttvp, md, dpos, NULL, 1);
if (t1 != 0) {
*f = 0;
return t1;
}
*v = ttvp;
}
return 0;
}
int
nfsm_wcc_data_xx(struct vnode **v, int *f, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
int ttattrf, ttretf = 0;
int t1;
tl = nfsm_dissect_xx(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*tl == nfs_true) {
tl = nfsm_dissect_xx(6 * NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
mtx_lock(&(VTONFS(*v))->n_mtx);
if (*f)
ttretf = (VTONFS(*v)->n_mtime.tv_sec == fxdr_unsigned(u_int32_t, *(tl + 2)) &&
VTONFS(*v)->n_mtime.tv_nsec == fxdr_unsigned(u_int32_t, *(tl + 3)));
mtx_unlock(&(VTONFS(*v))->n_mtx);
}
t1 = nfsm_postop_attr_xx(v, &ttattrf, md, dpos);
if (t1)
return t1;
if (*f)
*f = ttretf;
else
*f = ttattrf;
return 0;
}
int
nfsm_strtom_xx(const char *a, int s, int m, struct mbuf **mb, caddr_t *bpos)
{
u_int32_t *tl;
int t1;
if (s > m)
return ENAMETOOLONG;
t1 = nfsm_rndup(s) + NFSX_UNSIGNED;
if (t1 <= M_TRAILINGSPACE(*mb)) {
tl = nfsm_build_xx(t1, mb, bpos);
*tl++ = txdr_unsigned(s);
*(tl + ((t1 >> 2) - 2)) = 0;
bcopy(a, tl, s);
} else {
t1 = nfsm_strtmbuf(mb, bpos, a, s);
if (t1 != 0)
return t1;
}
return 0;
}
int
nfsm_fhtom_xx(struct vnode *v, int v3, struct mbuf **mb, caddr_t *bpos)
{
u_int32_t *tl;
int t1;
caddr_t cp;
if (v3) {
t1 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED;
if (t1 < M_TRAILINGSPACE(*mb)) {
tl = nfsm_build_xx(t1, mb, bpos);
*tl++ = txdr_unsigned(VTONFS(v)->n_fhsize);
*(tl + ((t1 >> 2) - 2)) = 0;
bcopy(VTONFS(v)->n_fhp, tl, VTONFS(v)->n_fhsize);
} else {
t1 = nfsm_strtmbuf(mb, bpos,
(const char *)VTONFS(v)->n_fhp,
VTONFS(v)->n_fhsize);
if (t1 != 0)
return t1;
}
} else {
cp = nfsm_build_xx(NFSX_V2FH, mb, bpos);
bcopy(VTONFS(v)->n_fhp, cp, NFSX_V2FH);
}
return 0;
}
void
nfsm_v3attrbuild_xx(struct vattr *va, int full, struct mbuf **mb,
caddr_t *bpos)
{
u_int32_t *tl;
if (va->va_mode != (mode_t)VNOVAL) {
tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
*tl++ = nfs_true;
*tl = txdr_unsigned(va->va_mode);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = nfs_false;
}
if (full && va->va_uid != (uid_t)VNOVAL) {
tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
*tl++ = nfs_true;
*tl = txdr_unsigned(va->va_uid);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = nfs_false;
}
if (full && va->va_gid != (gid_t)VNOVAL) {
tl = nfsm_build_xx(2 * NFSX_UNSIGNED, mb, bpos);
*tl++ = nfs_true;
*tl = txdr_unsigned(va->va_gid);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = nfs_false;
}
if (full && va->va_size != VNOVAL) {
tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
*tl++ = nfs_true;
txdr_hyper(va->va_size, tl);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = nfs_false;
}
if (va->va_atime.tv_sec != VNOVAL) {
if (va->va_atime.tv_sec != time_second) {
tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
txdr_nfsv3time(&va->va_atime, tl);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
}
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
}
if (va->va_mtime.tv_sec != VNOVAL) {
if (va->va_mtime.tv_sec != time_second) {
tl = nfsm_build_xx(3 * NFSX_UNSIGNED, mb, bpos);
*tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT);
txdr_nfsv3time(&va->va_mtime, tl);
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER);
}
} else {
tl = nfsm_build_xx(NFSX_UNSIGNED, mb, bpos);
*tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE);
}
}
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