306 lines
8.5 KiB
C
306 lines
8.5 KiB
C
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_bio.c 7.19 (Berkeley) 4/16/91
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*/
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#include "param.h"
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#include "proc.h"
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#include "buf.h"
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#include "uio.h"
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#include "namei.h"
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#include "vnode.h"
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#include "trace.h"
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#include "mount.h"
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#include "resourcevar.h"
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#include "nfsnode.h"
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#include "nfsv2.h"
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#include "nfs.h"
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#include "nfsiom.h"
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#include "nfsmount.h"
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/* True and false, how exciting */
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#define TRUE 1
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#define FALSE 0
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/*
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* Vnode op for read using bio
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* Any similarity to readip() is purely coincidental
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*/
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nfs_bioread(vp, uio, ioflag, cred)
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register struct vnode *vp;
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register struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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register struct nfsnode *np = VTONFS(vp);
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register int biosize;
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struct buf *bp;
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struct vattr vattr;
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daddr_t lbn, bn, rablock;
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int diff, error = 0;
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long n, on;
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#ifdef lint
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ioflag = ioflag;
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#endif /* lint */
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("nfs_read mode");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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if (uio->uio_offset < 0 && vp->v_type != VDIR)
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return (EINVAL);
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biosize = VFSTONFS(vp->v_mount)->nm_rsize;
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/*
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* If the file's modify time on the server has changed since the
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* last read rpc or you have written to the file,
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* you may have lost data cache consistency with the
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* server, so flush all of the file's data out of the cache.
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* Then force a getattr rpc to ensure that you have up to date
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* attributes.
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* NB: This implies that cache data can be read when up to
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* NFS_ATTRTIMEO seconds out of date. If you find that you need current
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* attributes this could be forced by setting n_attrstamp to 0 before
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* the nfs_dogetattr() call.
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*/
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if (vp->v_type != VLNK) {
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if (np->n_flag & NMODIFIED) {
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np->n_flag &= ~NMODIFIED;
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vinvalbuf(vp, TRUE);
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np->n_attrstamp = 0;
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np->n_direofoffset = 0;
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if (error = nfs_dogetattr(vp, &vattr, cred, 1,
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uio->uio_procp))
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return (error);
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np->n_mtime = vattr.va_mtime.tv_sec;
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} else {
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if (error = nfs_dogetattr(vp, &vattr, cred, 1,
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uio->uio_procp))
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return (error);
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if (np->n_mtime != vattr.va_mtime.tv_sec) {
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np->n_direofoffset = 0;
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vinvalbuf(vp, TRUE);
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np->n_mtime = vattr.va_mtime.tv_sec;
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}
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}
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}
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do {
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switch (vp->v_type) {
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case VREG:
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nfsstats.biocache_reads++;
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lbn = uio->uio_offset / biosize;
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on = uio->uio_offset & (biosize-1);
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n = MIN((unsigned)(biosize - on), uio->uio_resid);
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diff = np->n_size - uio->uio_offset;
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if (diff <= 0)
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return (error);
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if (diff < n)
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n = diff;
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bn = lbn*(biosize/DEV_BSIZE);
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rablock = (lbn+1)*(biosize/DEV_BSIZE);
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if (vp->v_lastr + 1 == lbn &&
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np->n_size > (rablock * DEV_BSIZE))
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error = breada(vp, bn, biosize, rablock, biosize,
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cred, &bp);
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else
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error = bread(vp, bn, biosize, cred, &bp);
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vp->v_lastr = lbn;
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if (bp->b_resid) {
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diff = (on >= (biosize-bp->b_resid)) ? 0 :
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(biosize-bp->b_resid-on);
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n = MIN(n, diff);
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}
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break;
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case VLNK:
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nfsstats.biocache_readlinks++;
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on = 0;
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error = bread(vp, (daddr_t)0, NFS_MAXPATHLEN, cred, &bp);
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n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
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break;
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case VDIR:
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nfsstats.biocache_readdirs++;
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on = 0;
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error = bread(vp, uio->uio_offset, NFS_DIRBLKSIZ, cred, &bp);
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n = MIN(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
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break;
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};
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if (error) {
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brelse(bp);
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return (error);
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}
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if (n > 0)
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error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
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switch (vp->v_type) {
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case VREG:
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if (n+on == biosize || uio->uio_offset == np->n_size)
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bp->b_flags |= B_AGE;
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break;
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case VLNK:
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n = 0;
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break;
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case VDIR:
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uio->uio_offset = bp->b_blkno;
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break;
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};
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brelse(bp);
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} while (error == 0 && uio->uio_resid > 0 && n != 0);
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return (error);
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}
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/*
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* Vnode op for write using bio
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*/
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nfs_write(vp, uio, ioflag, cred)
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register struct vnode *vp;
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register struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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struct proc *p = uio->uio_procp;
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register int biosize;
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struct buf *bp;
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struct nfsnode *np = VTONFS(vp);
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struct vattr vattr;
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daddr_t lbn, bn;
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int n, on, error = 0;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_WRITE)
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panic("nfs_write mode");
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if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
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panic("nfs_write proc");
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#endif
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if (vp->v_type != VREG)
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return (EIO);
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/* Should we try and do this ?? */
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if (ioflag & (IO_APPEND | IO_SYNC)) {
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if (np->n_flag & NMODIFIED) {
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np->n_flag &= ~NMODIFIED;
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vinvalbuf(vp, TRUE);
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}
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if (ioflag & IO_APPEND) {
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np->n_attrstamp = 0;
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if (error = nfs_dogetattr(vp, &vattr, cred, 1, p))
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return (error);
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uio->uio_offset = np->n_size;
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}
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return (nfs_writerpc(vp, uio, cred));
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}
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#ifdef notdef
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cnt = uio->uio_resid;
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osize = np->n_size;
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#endif
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if (uio->uio_offset < 0)
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return (EINVAL);
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if (uio->uio_resid == 0)
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return (0);
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/*
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* Maybe this should be above the vnode op call, but so long as
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* file servers have no limits, i don't think it matters
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*/
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if (uio->uio_offset + uio->uio_resid >
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p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
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psignal(p, SIGXFSZ);
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return (EFBIG);
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}
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/*
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* I use nm_rsize, not nm_wsize so that all buffer cache blocks
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* will be the same size within a filesystem. nfs_writerpc will
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* still use nm_wsize when sizing the rpc's.
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*/
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biosize = VFSTONFS(vp->v_mount)->nm_rsize;
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np->n_flag |= NMODIFIED;
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do {
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nfsstats.biocache_writes++;
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lbn = uio->uio_offset / biosize;
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on = uio->uio_offset & (biosize-1);
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n = MIN((unsigned)(biosize - on), uio->uio_resid);
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if (uio->uio_offset+n > np->n_size) {
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np->n_size = uio->uio_offset+n;
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vnode_pager_setsize(vp, np->n_size);
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}
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bn = lbn*(biosize/DEV_BSIZE);
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again:
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bp = getblk(vp, bn, biosize);
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if (bp->b_wcred == NOCRED) {
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crhold(cred);
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bp->b_wcred = cred;
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}
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if (bp->b_dirtyend > 0) {
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/*
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* If the new write will leave a contiguous dirty
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* area, just update the b_dirtyoff and b_dirtyend,
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* otherwise force a write rpc of the old dirty area.
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*/
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if (on <= bp->b_dirtyend && (on+n) >= bp->b_dirtyoff) {
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bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
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bp->b_dirtyend = MAX((on+n), bp->b_dirtyend);
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} else {
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bp->b_proc = p;
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if (error = bwrite(bp))
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return (error);
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goto again;
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}
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} else {
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bp->b_dirtyoff = on;
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bp->b_dirtyend = on+n;
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}
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if (error = uiomove(bp->b_un.b_addr + on, n, uio)) {
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brelse(bp);
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return (error);
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}
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if ((n+on) == biosize) {
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bp->b_flags |= B_AGE;
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bp->b_proc = (struct proc *)0;
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bawrite(bp);
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} else {
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bp->b_proc = (struct proc *)0;
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bdwrite(bp);
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}
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} while (error == 0 && uio->uio_resid > 0 && n != 0);
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#ifdef notdef
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/* Should we try and do this for nfs ?? */
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if (error && (ioflag & IO_UNIT)) {
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np->n_size = osize;
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uio->uio_offset -= cnt - uio->uio_resid;
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uio->uio_resid = cnt;
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}
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#endif
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return (error);
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}
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