310 lines
8.7 KiB
C
310 lines
8.7 KiB
C
/*
|
|
* Copyright (c) 1989 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.
|
|
*
|
|
* from: @(#)nfs_bio.c 7.19 (Berkeley) 4/16/91
|
|
* $Id: nfs_bio.c,v 1.8 1993/12/18 00:44:53 mycroft Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/trace.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/resourcevar.h>
|
|
|
|
#include <nfs/nfsnode.h>
|
|
#include <nfs/nfsv2.h>
|
|
#include <nfs/nfs.h>
|
|
#include <nfs/nfsiom.h>
|
|
#include <nfs/nfsmount.h>
|
|
|
|
/* True and false, how exciting */
|
|
#define TRUE 1
|
|
#define FALSE 0
|
|
|
|
/*
|
|
* Vnode op for read using bio
|
|
* Any similarity to readip() is purely coincidental
|
|
*/
|
|
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;
|
|
struct buf *bp;
|
|
struct vattr vattr;
|
|
daddr_t lbn, bn, rablock;
|
|
int diff, error = 0;
|
|
long n, on;
|
|
|
|
#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);
|
|
biosize = VFSTONFS(vp->v_mount)->nm_rsize;
|
|
/*
|
|
* 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.
|
|
* 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 nfs_dogetattr() call.
|
|
*/
|
|
if (vp->v_type != VLNK) {
|
|
if (np->n_flag & NMODIFIED) {
|
|
np->n_flag &= ~NMODIFIED;
|
|
vinvalbuf(vp, TRUE);
|
|
np->n_attrstamp = 0;
|
|
np->n_direofoffset = 0;
|
|
if (error = nfs_dogetattr(vp, &vattr, cred, 1,
|
|
uio->uio_procp))
|
|
return (error);
|
|
np->n_mtime = vattr.va_mtime.tv_sec;
|
|
} else {
|
|
if (error = nfs_dogetattr(vp, &vattr, cred, 1,
|
|
uio->uio_procp))
|
|
return (error);
|
|
if (np->n_mtime != vattr.va_mtime.tv_sec) {
|
|
np->n_direofoffset = 0;
|
|
vinvalbuf(vp, TRUE);
|
|
np->n_mtime = vattr.va_mtime.tv_sec;
|
|
}
|
|
}
|
|
}
|
|
do {
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
nfsstats.biocache_reads++;
|
|
lbn = uio->uio_offset / biosize;
|
|
on = uio->uio_offset & (biosize-1);
|
|
n = MIN((unsigned)(biosize - on), uio->uio_resid);
|
|
diff = np->n_size - uio->uio_offset;
|
|
if (diff <= 0)
|
|
return (error);
|
|
if (diff < n)
|
|
n = diff;
|
|
bn = lbn*(biosize/DEV_BSIZE);
|
|
rablock = (lbn+1)*(biosize/DEV_BSIZE);
|
|
if (vp->v_lastr + 1 == lbn &&
|
|
np->n_size > (rablock * DEV_BSIZE))
|
|
error = breada(vp, bn, biosize, rablock, biosize,
|
|
cred, &bp);
|
|
else
|
|
error = bread(vp, bn, biosize, cred, &bp);
|
|
vp->v_lastr = lbn;
|
|
if (bp->b_resid) {
|
|
diff = (on >= (biosize-bp->b_resid)) ? 0 :
|
|
(biosize-bp->b_resid-on);
|
|
n = MIN(n, diff);
|
|
}
|
|
break;
|
|
case VLNK:
|
|
nfsstats.biocache_readlinks++;
|
|
on = 0;
|
|
error = bread(vp, (daddr_t)0, NFS_MAXPATHLEN, cred, &bp);
|
|
n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
|
|
break;
|
|
case VDIR:
|
|
nfsstats.biocache_readdirs++;
|
|
on = 0;
|
|
error = bread(vp, uio->uio_offset, NFS_DIRBLKSIZ, cred, &bp);
|
|
n = MIN(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
|
|
break;
|
|
};
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (n > 0)
|
|
error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
if (n+on == biosize || uio->uio_offset == np->n_size)
|
|
bp->b_flags |= B_AGE;
|
|
break;
|
|
case VLNK:
|
|
n = 0;
|
|
break;
|
|
case VDIR:
|
|
uio->uio_offset = bp->b_blkno;
|
|
break;
|
|
};
|
|
brelse(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write using bio
|
|
*/
|
|
nfs_write(vp, uio, ioflag, cred)
|
|
register struct vnode *vp;
|
|
register struct uio *uio;
|
|
int ioflag;
|
|
struct ucred *cred;
|
|
{
|
|
struct proc *p = uio->uio_procp;
|
|
register int biosize;
|
|
struct buf *bp;
|
|
struct nfsnode *np = VTONFS(vp);
|
|
struct vattr vattr;
|
|
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);
|
|
/* Should we try and do this ?? */
|
|
if (ioflag & (IO_APPEND | IO_SYNC)) {
|
|
if (np->n_flag & NMODIFIED) {
|
|
np->n_flag &= ~NMODIFIED;
|
|
vinvalbuf(vp, TRUE);
|
|
}
|
|
if (ioflag & IO_APPEND) {
|
|
np->n_attrstamp = 0;
|
|
if (error = nfs_dogetattr(vp, &vattr, cred, 1, p))
|
|
return (error);
|
|
uio->uio_offset = np->n_size;
|
|
}
|
|
return (nfs_writerpc(vp, uio, cred));
|
|
}
|
|
#ifdef notdef
|
|
cnt = uio->uio_resid;
|
|
osize = np->n_size;
|
|
#endif
|
|
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 = VFSTONFS(vp->v_mount)->nm_rsize;
|
|
np->n_flag |= NMODIFIED;
|
|
vnode_pager_uncache(vp);
|
|
do {
|
|
nfsstats.biocache_writes++;
|
|
lbn = uio->uio_offset / biosize;
|
|
on = uio->uio_offset & (biosize-1);
|
|
n = MIN((unsigned)(biosize - on), uio->uio_resid);
|
|
if (uio->uio_offset+n > np->n_size) {
|
|
np->n_size = uio->uio_offset+n;
|
|
vnode_pager_setsize(vp, np->n_size);
|
|
}
|
|
bn = lbn*(biosize/DEV_BSIZE);
|
|
again:
|
|
bp = getblk(vp, bn, biosize);
|
|
if (bp->b_wcred == NOCRED && cred != NOCRED) {
|
|
crhold(cred);
|
|
bp->b_wcred = cred;
|
|
}
|
|
if (bp->b_dirtyend > 0) {
|
|
/*
|
|
* 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 (on <= bp->b_dirtyend && (on+n) >= bp->b_dirtyoff) {
|
|
bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
|
|
bp->b_dirtyend = MAX((on+n), bp->b_dirtyend);
|
|
} else {
|
|
bp->b_proc = p;
|
|
if (error = bwrite(bp))
|
|
return (error);
|
|
goto again;
|
|
}
|
|
} else {
|
|
bp->b_dirtyoff = on;
|
|
bp->b_dirtyend = on+n;
|
|
}
|
|
if (error = uiomove(bp->b_un.b_addr + on, n, uio)) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if ((n+on) == biosize) {
|
|
bp->b_flags |= B_AGE;
|
|
bp->b_proc = (struct proc *)0;
|
|
bawrite(bp);
|
|
} else {
|
|
bp->b_proc = (struct proc *)0;
|
|
bdwrite(bp);
|
|
}
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
#ifdef notdef
|
|
/* Should we try and do this for nfs ?? */
|
|
if (error && (ioflag & IO_UNIT)) {
|
|
np->n_size = osize;
|
|
uio->uio_offset -= cnt - uio->uio_resid;
|
|
uio->uio_resid = cnt;
|
|
}
|
|
#endif
|
|
return (error);
|
|
}
|