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freebsd-src/sys/nfsclient/nfs_subs.c
Rick Macklem 913df8fd72 A problem with the old NFS client where large writes to large files 
would sometimes result in a corrupted file was reported via email.
This problem appears to have been caused by r251719 (reverting
r251719 fixed the problem). Although I have not been able to
reproduce this problem, I suspect it is caused by another thread
increasing np->n_size after the mtx_unlock(&np->n_mtx) but before
the vnode_pager_setsize() call. Since the np->n_mtx mutex serializes
updates to np->n_size, doing the vnode_pager_setsize() with the
mutex locked appears to avoid the problem.
Unfortunately, vnode_pager_setsize() where the new size is smaller,
cannot be called with a mutex held.
This patch returns the semantics to be close to pre-r251719 such that the
call to the vnode_pager_setsize() is only delayed until after the mutex is
unlocked when np->n_size is shrinking. Since the file is growing
when being written, I believe this will fix the corruption.

Reported by:	David G. Lawrence (dg@dglawrence.com)
Tested by:	David G. Lawrence (pending, to happen soon)
Reviewed by:	kib
MFC after:	1 week
2013-07-04 00:54:23 +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_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 "opt_kdtrace.h"
#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/rwlock.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/sysproto.h>
#include <sys/taskqueue.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsnode.h>
#include <nfs/nfs_kdtrace.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>
#ifdef KDTRACE_HOOKS
dtrace_nfsclient_attrcache_flush_probe_func_t
dtrace_nfsclient_attrcache_flush_done_probe;
uint32_t nfsclient_attrcache_flush_done_id;
dtrace_nfsclient_attrcache_get_hit_probe_func_t
dtrace_nfsclient_attrcache_get_hit_probe;
uint32_t nfsclient_attrcache_get_hit_id;
dtrace_nfsclient_attrcache_get_miss_probe_func_t
dtrace_nfsclient_attrcache_get_miss_probe;
uint32_t nfsclient_attrcache_get_miss_id;
dtrace_nfsclient_attrcache_load_probe_func_t
dtrace_nfsclient_attrcache_load_done_probe;
uint32_t nfsclient_attrcache_load_done_id;
#endif /* !KDTRACE_HOOKS */
/*
* 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 nfs_true, nfs_false;
/* And other global data */
static 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_bufq nfs_bufq;
static struct mtx nfs_xid_mtx;
struct task nfs_nfsiodnew_task;
/*
* 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);
u_int32_t
nfs_xid_gen(void)
{
uint32_t xid;
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++;
xid = nfs_xid;
mtx_unlock(&nfs_xid_mtx);
return xid;
}
/*
* 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;
KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1"));
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) {
if (clflg)
mp = m_getcl(M_WAITOK, MT_DATA, 0);
else
mp = m_get(M_WAITOK, MT_DATA);
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)) {
mp = m_get(M_WAITOK, MT_DATA);
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) {
if (siz > MLEN) {
m1 = m_getcl(M_WAITOK, MT_DATA, 0);
m1->m_len = MCLBYTES;
} else {
m1 = m_get(M_WAITOK, MT_DATA);
m1->m_len = MLEN;
}
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);
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] = NFSIOD_NOT_AVAILABLE;
nfs_iodmount[i] = NULL;
}
nfs_nhinit(); /* Init the nfsnode table */
/*
* Initialize reply list and start timer
*/
mtx_init(&nfs_iod_mtx, "NFS iod lock", NULL, MTX_DEF);
mtx_init(&nfs_xid_mtx, "NFS xid lock", NULL, MTX_DEF);
TASK_INIT(&nfs_nfsiodnew_task, 0, nfs_nfsiodnew_tq, NULL);
nfs_pbuf_freecnt = nswbuf / 2 + 1;
return (0);
}
int
nfs_uninit(struct vfsconf *vfsp)
{
int i;
/*
* Tell all nfsiod processes to exit. Clear nfs_iodmax, and wakeup
* any sleeping nfsiods so they check nfs_iodmax and exit.
* Drain nfsiodnew task before we wait for them to finish.
*/
mtx_lock(&nfs_iod_mtx);
nfs_iodmax = 0;
mtx_unlock(&nfs_iod_mtx);
taskqueue_drain(taskqueue_thread, &nfs_nfsiodnew_task);
mtx_lock(&nfs_iod_mtx);
for (i = 0; i < nfs_numasync; i++)
if (nfs_iodwant[i] == NFSIOD_AVAILABLE)
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)
{
int old_lock;
ASSERT_VOP_LOCKED(vp, "nfs_upgrade_vnlock");
old_lock = VOP_ISLOCKED(vp);
if (old_lock != LK_EXCLUSIVE) {
KASSERT(old_lock == LK_SHARED,
("nfs_upgrade_vnlock: wrong old_lock %d", old_lock));
/* Upgrade to exclusive lock, this might block */
vn_lock(vp, LK_UPGRADE | LK_RETRY);
}
return (old_lock);
}
void
nfs_downgrade_vnlock(struct vnode *vp, int old_lock)
{
if (old_lock != LK_EXCLUSIVE) {
KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock));
/* Downgrade from exclusive lock. */
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
}
}
void
nfs_printf(const char *fmt, ...)
{
va_list ap;
mtx_lock(&Giant);
va_start(ap, fmt);
vprintf(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 = NULL;
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);
int error = 0;
u_quad_t nsize;
int setnsize;
md = *mdp;
t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_WAITOK);
if (cp2 == NULL) {
error = EBADRPC;
goto out;
}
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;
setnsize = 0;
nsize = 0;
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;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
vnode_pager_setsize(vp, np->n_size);
} 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;
}
vnode_pager_setsize(vp, np->n_size);
} else if (vap->va_size < np->n_size) {
/*
* When shrinking the size, the call to
* vnode_pager_setsize() cannot be done
* with the mutex held, so delay it until
* after the mtx_unlock call.
*/
nsize = np->n_size = vap->va_size;
np->n_flag |= NSIZECHANGED;
setnsize = 1;
} 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;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
}
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;
}
}
#ifdef KDTRACE_HOOKS
if (np->n_attrstamp != 0)
KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, &np->n_vattr, 0);
#endif
mtx_unlock(&np->n_mtx);
if (setnsize)
vnode_pager_setsize(vp, nsize);
out:
#ifdef KDTRACE_HOOKS
if (error)
KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, NULL, error);
#endif
return (error);
}
#ifdef NFS_ACDEBUG
#include <sys/sysctl.h>
SYSCTL_DECL(_vfs_oldnfs);
static int nfs_acdebug;
SYSCTL_INT(_vfs_oldnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0,
"Toggle acdebug (attribute cache debug) flag");
#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);
#ifdef NFS_ACDEBUG
mtx_unlock(&Giant); /* nfs_printf() */
#endif
KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
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
KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
return (0);
}
/*
* Purge all cached information about an NFS vnode including name
* cache entries, the attribute cache, and the access cache. This is
* called when an NFS request for a node fails with a stale
* filehandle.
*/
void
nfs_purgecache(struct vnode *vp)
{
struct nfsnode *np;
int i;
np = VTONFS(vp);
cache_purge(vp);
mtx_lock(&np->n_mtx);
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
np->n_accesscache[i].stamp = 0;
KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
mtx_unlock(&np->n_mtx);
}
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) {
KASSERT(!add, ("nfs getcookie add at <= 0"));
return (&nfs_nullcookie);
}
pos--;
dp = LIST_FIRST(&np->n_cookies);
if (!dp) {
if (add) {
dp = malloc(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) {
dp2 = malloc(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);
KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
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;
struct bufobj *bo;
MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
bo = &vp->v_bufobj;
vholdl(vp);
VI_UNLOCK(vp);
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))
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
}
BO_UNLOCK(bo);
vdrop(vp);
}
}
/*
* 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 vattr *va,
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, va, 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, NULL, 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_vaflags & VA_UTIMES_NULL) == 0) {
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_vaflags & VA_UTIMES_NULL) == 0) {
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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