f23b4c91c4
- Delete redundant declarations. - Add -Wredundant-declarations to Makefile.i386 so they don't come back. - Delete sloppy COMMON-style declarations of uninitialized data in header files. - Add a few prototypes. - Clean up warnings resulting from the above. NB: ioconf.c will still generate a redundant-declaration warning, which is unavoidable unless somebody volunteers to make `config' smarter.
803 lines
21 KiB
C
803 lines
21 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Rick Macklem at The University of Guelph.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)nfs_bio.c 8.5 (Berkeley) 1/4/94
|
|
* $Id: nfs_bio.c,v 1.4 1994/08/08 09:11:41 davidg Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/trace.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/kernel.h>
|
|
|
|
#include <vm/vm.h>
|
|
|
|
#include <nfs/nfsnode.h>
|
|
#include <nfs/rpcv2.h>
|
|
#include <nfs/nfsv2.h>
|
|
#include <nfs/nfs.h>
|
|
#include <nfs/nfsmount.h>
|
|
#include <nfs/nqnfs.h>
|
|
|
|
struct buf *nfs_getcacheblk();
|
|
extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
|
|
extern int nfs_numasync;
|
|
|
|
/*
|
|
* Vnode op for read using bio
|
|
* Any similarity to readip() is purely coincidental
|
|
*/
|
|
int
|
|
nfs_bioread(vp, uio, ioflag, cred)
|
|
register struct vnode *vp;
|
|
register struct uio *uio;
|
|
int ioflag;
|
|
struct ucred *cred;
|
|
{
|
|
register struct nfsnode *np = VTONFS(vp);
|
|
register int biosize, diff;
|
|
struct buf *bp = 0, *rabp;
|
|
struct vattr vattr;
|
|
struct proc *p;
|
|
struct nfsmount *nmp;
|
|
daddr_t lbn, bn, rabn;
|
|
caddr_t baddr;
|
|
int got_buf = 0, nra, error = 0, n = 0, on = 0, not_readin;
|
|
|
|
#ifdef lint
|
|
ioflag = ioflag;
|
|
#endif /* lint */
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_READ)
|
|
panic("nfs_read mode");
|
|
#endif
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (uio->uio_offset < 0 && vp->v_type != VDIR)
|
|
return (EINVAL);
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
biosize = nmp->nm_rsize;
|
|
p = uio->uio_procp;
|
|
/*
|
|
* For nfs, cache consistency can only be maintained approximately.
|
|
* Although RFC1094 does not specify the criteria, the following is
|
|
* believed to be compatible with the reference port.
|
|
* For nqnfs, full cache consistency is maintained within the loop.
|
|
* For nfs:
|
|
* If the file's modify time on the server has changed since the
|
|
* last read rpc or you have written to the file,
|
|
* you may have lost data cache consistency with the
|
|
* server, so flush all of the file's data out of the cache.
|
|
* Then force a getattr rpc to ensure that you have up to date
|
|
* attributes.
|
|
* The mount flag NFSMNT_MYWRITE says "Assume that my writes are
|
|
* the ones changing the modify time.
|
|
* NB: This implies that cache data can be read when up to
|
|
* NFS_ATTRTIMEO seconds out of date. If you find that you need current
|
|
* attributes this could be forced by setting n_attrstamp to 0 before
|
|
* the VOP_GETATTR() call.
|
|
*/
|
|
if ((nmp->nm_flag & NFSMNT_NQNFS) == 0 && vp->v_type != VLNK) {
|
|
if (np->n_flag & NMODIFIED) {
|
|
if ((nmp->nm_flag & NFSMNT_MYWRITE) == 0 ||
|
|
vp->v_type != VREG) {
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
}
|
|
np->n_attrstamp = 0;
|
|
np->n_direofoffset = 0;
|
|
if (error = VOP_GETATTR(vp, &vattr, cred, p))
|
|
return (error);
|
|
np->n_mtime = vattr.va_mtime.ts_sec;
|
|
} else {
|
|
if (error = VOP_GETATTR(vp, &vattr, cred, p))
|
|
return (error);
|
|
if (np->n_mtime != vattr.va_mtime.ts_sec) {
|
|
np->n_direofoffset = 0;
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
np->n_mtime = vattr.va_mtime.ts_sec;
|
|
}
|
|
}
|
|
}
|
|
do {
|
|
|
|
/*
|
|
* Get a valid lease. If cached data is stale, flush it.
|
|
*/
|
|
if (nmp->nm_flag & NFSMNT_NQNFS) {
|
|
if (NQNFS_CKINVALID(vp, np, NQL_READ)) {
|
|
do {
|
|
error = nqnfs_getlease(vp, NQL_READ, cred, p);
|
|
} while (error == NQNFS_EXPIRED);
|
|
if (error)
|
|
return (error);
|
|
if (np->n_lrev != np->n_brev ||
|
|
(np->n_flag & NQNFSNONCACHE) ||
|
|
((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) {
|
|
if (vp->v_type == VDIR) {
|
|
np->n_direofoffset = 0;
|
|
cache_purge(vp);
|
|
}
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
np->n_brev = np->n_lrev;
|
|
}
|
|
} else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) {
|
|
np->n_direofoffset = 0;
|
|
cache_purge(vp);
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
}
|
|
}
|
|
if (np->n_flag & NQNFSNONCACHE) {
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
error = nfs_readrpc(vp, uio, cred);
|
|
break;
|
|
case VLNK:
|
|
error = nfs_readlinkrpc(vp, uio, cred);
|
|
break;
|
|
case VDIR:
|
|
error = nfs_readdirrpc(vp, uio, cred);
|
|
break;
|
|
};
|
|
return (error);
|
|
}
|
|
baddr = (caddr_t)0;
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
nfsstats.biocache_reads++;
|
|
lbn = uio->uio_offset / biosize;
|
|
on = uio->uio_offset & (biosize-1);
|
|
bn = lbn * (biosize / DEV_BSIZE);
|
|
not_readin = 1;
|
|
|
|
/*
|
|
* Start the read ahead(s), as required.
|
|
*/
|
|
if (nfs_numasync > 0 && nmp->nm_readahead > 0 &&
|
|
lbn == vp->v_lastr + 1) {
|
|
for (nra = 0; nra < nmp->nm_readahead &&
|
|
(lbn + 1 + nra) * biosize < np->n_size; nra++) {
|
|
rabn = (lbn + 1 + nra) * (biosize / DEV_BSIZE);
|
|
if (!incore(vp, rabn)) {
|
|
rabp = nfs_getcacheblk(vp, rabn, biosize, p);
|
|
if (!rabp)
|
|
return (EINTR);
|
|
if ((rabp->b_flags & (B_DELWRI | B_DONE)) == 0) {
|
|
rabp->b_flags |= (B_READ | B_ASYNC);
|
|
if (nfs_asyncio(rabp, cred)) {
|
|
rabp->b_flags |= B_INVAL;
|
|
brelse(rabp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the block is in the cache and has the required data
|
|
* in a valid region, just copy it out.
|
|
* Otherwise, get the block and write back/read in,
|
|
* as required.
|
|
*/
|
|
if ((bp = incore(vp, bn)) &&
|
|
(bp->b_flags & (B_BUSY | B_WRITEINPROG)) ==
|
|
(B_BUSY | B_WRITEINPROG))
|
|
got_buf = 0;
|
|
else {
|
|
again:
|
|
bp = nfs_getcacheblk(vp, bn, biosize, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
got_buf = 1;
|
|
if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
not_readin = 0;
|
|
if (error = nfs_doio(bp, cred, p)) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
}
|
|
n = min((unsigned)(biosize - on), uio->uio_resid);
|
|
diff = np->n_size - uio->uio_offset;
|
|
if (diff < n)
|
|
n = diff;
|
|
if (not_readin && n > 0) {
|
|
if (on < bp->b_validoff || (on + n) > bp->b_validend) {
|
|
if (!got_buf) {
|
|
bp = nfs_getcacheblk(vp, bn, biosize, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
got_buf = 1;
|
|
}
|
|
bp->b_flags |= B_INVAL;
|
|
if (bp->b_dirtyend > 0) {
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("nfsbioread");
|
|
if (VOP_BWRITE(bp) == EINTR)
|
|
return (EINTR);
|
|
} else
|
|
brelse(bp);
|
|
goto again;
|
|
}
|
|
}
|
|
vp->v_lastr = lbn;
|
|
diff = (on >= bp->b_validend) ? 0 : (bp->b_validend - on);
|
|
if (diff < n)
|
|
n = diff;
|
|
break;
|
|
case VLNK:
|
|
nfsstats.biocache_readlinks++;
|
|
bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if ((bp->b_flags & B_DONE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
if (error = nfs_doio(bp, cred, p)) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
|
|
got_buf = 1;
|
|
on = 0;
|
|
break;
|
|
case VDIR:
|
|
nfsstats.biocache_readdirs++;
|
|
bn = (daddr_t)uio->uio_offset;
|
|
bp = nfs_getcacheblk(vp, bn, NFS_DIRBLKSIZ, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if ((bp->b_flags & B_DONE) == 0) {
|
|
bp->b_flags |= B_READ;
|
|
if (error = nfs_doio(bp, cred, p)) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If not eof and read aheads are enabled, start one.
|
|
* (You need the current block first, so that you have the
|
|
* directory offset cookie of the next block.
|
|
*/
|
|
rabn = bp->b_blkno;
|
|
if (nfs_numasync > 0 && nmp->nm_readahead > 0 &&
|
|
rabn != 0 && rabn != np->n_direofoffset &&
|
|
!incore(vp, rabn)) {
|
|
rabp = nfs_getcacheblk(vp, rabn, NFS_DIRBLKSIZ, p);
|
|
if (rabp) {
|
|
if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
|
rabp->b_flags |= (B_READ | B_ASYNC);
|
|
if (nfs_asyncio(rabp, cred)) {
|
|
rabp->b_flags |= B_INVAL;
|
|
brelse(rabp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
on = 0;
|
|
n = min(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
|
|
got_buf = 1;
|
|
break;
|
|
};
|
|
|
|
if (n > 0) {
|
|
if (!baddr)
|
|
baddr = bp->b_data;
|
|
error = uiomove(baddr + on, (int)n, uio);
|
|
}
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
break;
|
|
case VLNK:
|
|
n = 0;
|
|
break;
|
|
case VDIR:
|
|
uio->uio_offset = bp->b_blkno;
|
|
break;
|
|
};
|
|
if (got_buf)
|
|
brelse(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n > 0);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write using bio
|
|
*/
|
|
int
|
|
nfs_write(ap)
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
register int biosize;
|
|
register struct uio *uio = ap->a_uio;
|
|
struct proc *p = uio->uio_procp;
|
|
register struct vnode *vp = ap->a_vp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
register struct ucred *cred = ap->a_cred;
|
|
int ioflag = ap->a_ioflag;
|
|
struct buf *bp;
|
|
struct vattr vattr;
|
|
struct nfsmount *nmp;
|
|
daddr_t lbn, bn;
|
|
int n, on, error = 0;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_WRITE)
|
|
panic("nfs_write mode");
|
|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
|
|
panic("nfs_write proc");
|
|
#endif
|
|
if (vp->v_type != VREG)
|
|
return (EIO);
|
|
if (np->n_flag & NWRITEERR) {
|
|
np->n_flag &= ~NWRITEERR;
|
|
return (np->n_error);
|
|
}
|
|
if (ioflag & (IO_APPEND | IO_SYNC)) {
|
|
if (np->n_flag & NMODIFIED) {
|
|
np->n_attrstamp = 0;
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
}
|
|
if (ioflag & IO_APPEND) {
|
|
np->n_attrstamp = 0;
|
|
if (error = VOP_GETATTR(vp, &vattr, cred, p))
|
|
return (error);
|
|
uio->uio_offset = np->n_size;
|
|
}
|
|
}
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
/*
|
|
* Maybe this should be above the vnode op call, but so long as
|
|
* file servers have no limits, i don't think it matters
|
|
*/
|
|
if (p && uio->uio_offset + uio->uio_resid >
|
|
p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
|
|
psignal(p, SIGXFSZ);
|
|
return (EFBIG);
|
|
}
|
|
/*
|
|
* I use nm_rsize, not nm_wsize so that all buffer cache blocks
|
|
* will be the same size within a filesystem. nfs_writerpc will
|
|
* still use nm_wsize when sizing the rpc's.
|
|
*/
|
|
biosize = nmp->nm_rsize;
|
|
do {
|
|
|
|
/*
|
|
* Check for a valid write lease.
|
|
* If non-cachable, just do the rpc
|
|
*/
|
|
if ((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
NQNFS_CKINVALID(vp, np, NQL_WRITE)) {
|
|
do {
|
|
error = nqnfs_getlease(vp, NQL_WRITE, cred, p);
|
|
} while (error == NQNFS_EXPIRED);
|
|
if (error)
|
|
return (error);
|
|
if (np->n_lrev != np->n_brev ||
|
|
(np->n_flag & NQNFSNONCACHE)) {
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
np->n_brev = np->n_lrev;
|
|
}
|
|
}
|
|
if (np->n_flag & NQNFSNONCACHE)
|
|
return (nfs_writerpc(vp, uio, cred, ioflag));
|
|
nfsstats.biocache_writes++;
|
|
lbn = uio->uio_offset / biosize;
|
|
on = uio->uio_offset & (biosize-1);
|
|
n = min((unsigned)(biosize - on), uio->uio_resid);
|
|
bn = lbn * (biosize / DEV_BSIZE);
|
|
again:
|
|
bp = nfs_getcacheblk(vp, bn, biosize, p);
|
|
if (!bp)
|
|
return (EINTR);
|
|
if (bp->b_wcred == NOCRED) {
|
|
crhold(cred);
|
|
bp->b_wcred = cred;
|
|
}
|
|
np->n_flag |= NMODIFIED;
|
|
if (uio->uio_offset + n > np->n_size) {
|
|
np->n_size = uio->uio_offset + n;
|
|
vnode_pager_setsize(vp, (u_long)np->n_size);
|
|
}
|
|
|
|
/*
|
|
* If the new write will leave a contiguous dirty
|
|
* area, just update the b_dirtyoff and b_dirtyend,
|
|
* otherwise force a write rpc of the old dirty area.
|
|
*/
|
|
if (bp->b_dirtyend > 0 &&
|
|
(on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
|
|
bp->b_proc = p;
|
|
if (VOP_BWRITE(bp) == EINTR)
|
|
return (EINTR);
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Check for valid write lease and get one as required.
|
|
* In case getblk() and/or bwrite() delayed us.
|
|
*/
|
|
if ((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
NQNFS_CKINVALID(vp, np, NQL_WRITE)) {
|
|
do {
|
|
error = nqnfs_getlease(vp, NQL_WRITE, cred, p);
|
|
} while (error == NQNFS_EXPIRED);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (np->n_lrev != np->n_brev ||
|
|
(np->n_flag & NQNFSNONCACHE)) {
|
|
brelse(bp);
|
|
if (error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1))
|
|
return (error);
|
|
np->n_brev = np->n_lrev;
|
|
goto again;
|
|
}
|
|
}
|
|
if (error = uiomove((char *)bp->b_data + on, n, uio)) {
|
|
bp->b_flags |= B_ERROR;
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (bp->b_dirtyend > 0) {
|
|
bp->b_dirtyoff = min(on, bp->b_dirtyoff);
|
|
bp->b_dirtyend = max((on + n), bp->b_dirtyend);
|
|
} else {
|
|
bp->b_dirtyoff = on;
|
|
bp->b_dirtyend = on + n;
|
|
}
|
|
#ifndef notdef
|
|
if (bp->b_validend == 0 || bp->b_validend < bp->b_dirtyoff ||
|
|
bp->b_validoff > bp->b_dirtyend) {
|
|
bp->b_validoff = bp->b_dirtyoff;
|
|
bp->b_validend = bp->b_dirtyend;
|
|
} else {
|
|
bp->b_validoff = min(bp->b_validoff, bp->b_dirtyoff);
|
|
bp->b_validend = max(bp->b_validend, bp->b_dirtyend);
|
|
}
|
|
#else
|
|
bp->b_validoff = bp->b_dirtyoff;
|
|
bp->b_validend = bp->b_dirtyend;
|
|
#endif
|
|
if (ioflag & IO_APPEND)
|
|
bp->b_flags |= B_APPENDWRITE;
|
|
|
|
/*
|
|
* If the lease is non-cachable or IO_SYNC do bwrite().
|
|
*/
|
|
if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) {
|
|
bp->b_proc = p;
|
|
if (error = VOP_BWRITE(bp))
|
|
return (error);
|
|
} else if ((n + on) == biosize &&
|
|
(nmp->nm_flag & NFSMNT_NQNFS) == 0) {
|
|
bp->b_proc = (struct proc *)0;
|
|
bawrite(bp);
|
|
} else
|
|
bdwrite(bp);
|
|
} while (uio->uio_resid > 0 && n > 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Get an nfs cache block.
|
|
* Allocate a new one if the block isn't currently in the cache
|
|
* and return the block marked busy. If the calling process is
|
|
* interrupted by a signal for an interruptible mount point, return
|
|
* NULL.
|
|
*/
|
|
struct buf *
|
|
nfs_getcacheblk(vp, bn, size, p)
|
|
struct vnode *vp;
|
|
daddr_t bn;
|
|
int size;
|
|
struct proc *p;
|
|
{
|
|
register struct buf *bp;
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
|
|
if (nmp->nm_flag & NFSMNT_INT) {
|
|
bp = getblk(vp, bn, size, PCATCH, 0);
|
|
while (bp == (struct buf *)0) {
|
|
if (nfs_sigintr(nmp, (struct nfsreq *)0, p))
|
|
return ((struct buf *)0);
|
|
bp = getblk(vp, bn, size, 0, 2 * hz);
|
|
}
|
|
} else
|
|
bp = getblk(vp, bn, size, 0, 0);
|
|
return (bp);
|
|
}
|
|
|
|
/*
|
|
* Flush and invalidate all dirty buffers. If another process is already
|
|
* doing the flush, just wait for completion.
|
|
*/
|
|
int
|
|
nfs_vinvalbuf(vp, flags, cred, p, intrflg)
|
|
struct vnode *vp;
|
|
int flags;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
int intrflg;
|
|
{
|
|
register struct nfsnode *np = VTONFS(vp);
|
|
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
|
|
int error = 0, slpflag, slptimeo;
|
|
|
|
if ((nmp->nm_flag & NFSMNT_INT) == 0)
|
|
intrflg = 0;
|
|
if (intrflg) {
|
|
slpflag = PCATCH;
|
|
slptimeo = 2 * hz;
|
|
} else {
|
|
slpflag = 0;
|
|
slptimeo = 0;
|
|
}
|
|
/*
|
|
* First wait for any other process doing a flush to complete.
|
|
*/
|
|
while (np->n_flag & NFLUSHINPROG) {
|
|
np->n_flag |= NFLUSHWANT;
|
|
error = tsleep((caddr_t)&np->n_flag, PRIBIO + 2, "nfsvinval",
|
|
slptimeo);
|
|
if (error && intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p))
|
|
return (EINTR);
|
|
}
|
|
|
|
/*
|
|
* Now, flush as required.
|
|
*/
|
|
np->n_flag |= NFLUSHINPROG;
|
|
error = vinvalbuf(vp, flags, cred, p, slpflag, 0);
|
|
while (error) {
|
|
if (intrflg && nfs_sigintr(nmp, (struct nfsreq *)0, p)) {
|
|
np->n_flag &= ~NFLUSHINPROG;
|
|
if (np->n_flag & NFLUSHWANT) {
|
|
np->n_flag &= ~NFLUSHWANT;
|
|
wakeup((caddr_t)&np->n_flag);
|
|
}
|
|
return (EINTR);
|
|
}
|
|
error = vinvalbuf(vp, flags, cred, p, 0, slptimeo);
|
|
}
|
|
np->n_flag &= ~(NMODIFIED | NFLUSHINPROG);
|
|
if (np->n_flag & NFLUSHWANT) {
|
|
np->n_flag &= ~NFLUSHWANT;
|
|
wakeup((caddr_t)&np->n_flag);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initiate asynchronous I/O. Return an error if no nfsiods are available.
|
|
* This is mainly to avoid queueing async I/O requests when the nfsiods
|
|
* are all hung on a dead server.
|
|
*/
|
|
int
|
|
nfs_asyncio(bp, cred)
|
|
register struct buf *bp;
|
|
struct ucred *cred;
|
|
{
|
|
register int i;
|
|
|
|
if (nfs_numasync == 0)
|
|
return (EIO);
|
|
for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
|
|
if (nfs_iodwant[i]) {
|
|
if (bp->b_flags & B_READ) {
|
|
if (bp->b_rcred == NOCRED && cred != NOCRED) {
|
|
crhold(cred);
|
|
bp->b_rcred = cred;
|
|
}
|
|
} else {
|
|
if (bp->b_wcred == NOCRED && cred != NOCRED) {
|
|
crhold(cred);
|
|
bp->b_wcred = cred;
|
|
}
|
|
}
|
|
|
|
TAILQ_INSERT_TAIL(&nfs_bufq, bp, b_freelist);
|
|
nfs_iodwant[i] = (struct proc *)0;
|
|
wakeup((caddr_t)&nfs_iodwant[i]);
|
|
return (0);
|
|
}
|
|
return (EIO);
|
|
}
|
|
|
|
/*
|
|
* Do an I/O operation to/from a cache block. This may be called
|
|
* synchronously or from an nfsiod.
|
|
*/
|
|
int
|
|
nfs_doio(bp, cr, p)
|
|
register struct buf *bp;
|
|
struct cred *cr;
|
|
struct proc *p;
|
|
{
|
|
register struct uio *uiop;
|
|
register struct vnode *vp;
|
|
struct nfsnode *np;
|
|
struct nfsmount *nmp;
|
|
int error = 0, diff, len;
|
|
struct uio uio;
|
|
struct iovec io;
|
|
|
|
vp = bp->b_vp;
|
|
np = VTONFS(vp);
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
uiop = &uio;
|
|
uiop->uio_iov = &io;
|
|
uiop->uio_iovcnt = 1;
|
|
uiop->uio_segflg = UIO_SYSSPACE;
|
|
uiop->uio_procp = p;
|
|
|
|
/*
|
|
* Historically, paging was done with physio, but no more.
|
|
*/
|
|
if (bp->b_flags & B_PHYS)
|
|
panic("doio phys");
|
|
if (bp->b_flags & B_READ) {
|
|
io.iov_len = uiop->uio_resid = bp->b_bcount;
|
|
io.iov_base = bp->b_data;
|
|
uiop->uio_rw = UIO_READ;
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
uiop->uio_offset = bp->b_blkno * DEV_BSIZE;
|
|
nfsstats.read_bios++;
|
|
error = nfs_readrpc(vp, uiop, cr);
|
|
if (!error) {
|
|
bp->b_validoff = 0;
|
|
if (uiop->uio_resid) {
|
|
/*
|
|
* If len > 0, there is a hole in the file and
|
|
* no writes after the hole have been pushed to
|
|
* the server yet.
|
|
* Just zero fill the rest of the valid area.
|
|
*/
|
|
diff = bp->b_bcount - uiop->uio_resid;
|
|
len = np->n_size - (bp->b_blkno * DEV_BSIZE
|
|
+ diff);
|
|
if (len > 0) {
|
|
len = min(len, uiop->uio_resid);
|
|
bzero((char *)bp->b_data + diff, len);
|
|
bp->b_validend = diff + len;
|
|
} else
|
|
bp->b_validend = diff;
|
|
} else
|
|
bp->b_validend = bp->b_bcount;
|
|
}
|
|
if (p && (vp->v_flag & VTEXT) &&
|
|
(((nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
np->n_lrev != np->n_brev) ||
|
|
(!(nmp->nm_flag & NFSMNT_NQNFS) &&
|
|
np->n_mtime != np->n_vattr.va_mtime.ts_sec))) {
|
|
uprintf("Process killed due to text file modification\n");
|
|
psignal(p, SIGKILL);
|
|
p->p_flag |= P_NOSWAP;
|
|
}
|
|
break;
|
|
case VLNK:
|
|
uiop->uio_offset = 0;
|
|
nfsstats.readlink_bios++;
|
|
error = nfs_readlinkrpc(vp, uiop, cr);
|
|
break;
|
|
case VDIR:
|
|
uiop->uio_offset = bp->b_lblkno;
|
|
nfsstats.readdir_bios++;
|
|
if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS)
|
|
error = nfs_readdirlookrpc(vp, uiop, cr);
|
|
else
|
|
error = nfs_readdirrpc(vp, uiop, cr);
|
|
/*
|
|
* Save offset cookie in b_blkno.
|
|
*/
|
|
bp->b_blkno = uiop->uio_offset;
|
|
break;
|
|
};
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
bp->b_error = error;
|
|
}
|
|
} else {
|
|
io.iov_len = uiop->uio_resid = bp->b_dirtyend
|
|
- bp->b_dirtyoff;
|
|
uiop->uio_offset = (bp->b_blkno * DEV_BSIZE)
|
|
+ bp->b_dirtyoff;
|
|
io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
|
|
uiop->uio_rw = UIO_WRITE;
|
|
nfsstats.write_bios++;
|
|
if (bp->b_flags & B_APPENDWRITE)
|
|
error = nfs_writerpc(vp, uiop, cr, IO_APPEND);
|
|
else
|
|
error = nfs_writerpc(vp, uiop, cr, 0);
|
|
bp->b_flags &= ~(B_WRITEINPROG | B_APPENDWRITE);
|
|
|
|
/*
|
|
* For an interrupted write, the buffer is still valid and the
|
|
* write hasn't been pushed to the server yet, so we can't set
|
|
* B_ERROR and report the interruption by setting B_EINTR. For
|
|
* the B_ASYNC case, B_EINTR is not relevant, so the rpc attempt
|
|
* is essentially a noop.
|
|
*/
|
|
if (error == EINTR) {
|
|
bp->b_flags &= ~B_INVAL;
|
|
bp->b_flags |= B_DELWRI;
|
|
|
|
/*
|
|
* Since for the B_ASYNC case, nfs_bwrite() has reassigned the
|
|
* buffer to the clean list, we have to reassign it back to the
|
|
* dirty one. Ugh.
|
|
*/
|
|
if (bp->b_flags & B_ASYNC)
|
|
reassignbuf(bp, vp);
|
|
else
|
|
bp->b_flags |= B_EINTR;
|
|
} else {
|
|
if (error) {
|
|
bp->b_flags |= B_ERROR;
|
|
bp->b_error = np->n_error = error;
|
|
np->n_flag |= NWRITEERR;
|
|
}
|
|
bp->b_dirtyoff = bp->b_dirtyend = 0;
|
|
}
|
|
}
|
|
bp->b_resid = uiop->uio_resid;
|
|
biodone(bp);
|
|
return (error);
|
|
}
|