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NetBSD/sys/miscfs/genfs/genfs_vnops.c
chs 68b98ea45f several bugs: 
- in genfs_getpages() don't start read-ahead if we get an error on the
   sync read, and always start read-ahead after the range of the sync read
   if we do any at all.
 - off-by-one error in genfs_size().
2000-12-27 04:47:43 +00:00

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/* $NetBSD: genfs_vnops.c,v 1.24 2000/12/27 04:47:43 chs Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*
*/
#include "opt_nfsserver.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/poll.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <uvm/uvm.h>
#include <uvm/uvm_pager.h>
#ifdef NFSSERVER
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nqnfs.h>
#include <nfs/nfs_var.h>
#endif
int
genfs_poll(v)
void *v;
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
struct proc *a_p;
} */ *ap = v;
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
int
genfs_fsync(v)
void *v;
{
struct vop_fsync_args /* {
struct vnode *a_vp;
struct ucred *a_cred;
int a_flags;
off_t offlo;
off_t offhi;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
int wait;
wait = (ap->a_flags & FSYNC_WAIT) != 0;
vflushbuf(vp, wait);
if ((ap->a_flags & FSYNC_DATAONLY) != 0)
return (0);
else
return (VOP_UPDATE(vp, NULL, NULL, wait ? UPDATE_WAIT : 0));
}
int
genfs_seek(v)
void *v;
{
struct vop_seek_args /* {
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
struct ucred *a_ucred;
} */ *ap = v;
if (ap->a_newoff < 0)
return (EINVAL);
return (0);
}
int
genfs_abortop(v)
void *v;
{
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap = v;
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
return (0);
}
int
genfs_fcntl(v)
void *v;
{
struct vop_fcntl_args /* {
struct vnode *a_vp;
u_int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
if (ap->a_command == F_SETFL)
return (0);
else
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
genfs_badop(v)
void *v;
{
panic("genfs: bad op");
}
/*ARGSUSED*/
int
genfs_nullop(v)
void *v;
{
return (0);
}
/*ARGSUSED*/
int
genfs_einval(v)
void *v;
{
return (EINVAL);
}
/*ARGSUSED*/
int
genfs_eopnotsupp(v)
void *v;
{
return (EOPNOTSUPP);
}
/*
* Called when an fs doesn't support a particular vop but the vop needs to
* vrele, vput, or vunlock passed in vnodes.
*/
int
genfs_eopnotsupp_rele(v)
void *v;
{
struct vop_generic_args /*
struct vnodeop_desc *a_desc;
/ * other random data follows, presumably * /
} */ *ap = v;
struct vnodeop_desc *desc = ap->a_desc;
struct vnode *vp;
int flags, i, j, offset;
flags = desc->vdesc_flags;
for (i = 0; i < VDESC_MAX_VPS; flags >>=1, i++) {
if ((offset = desc->vdesc_vp_offsets[i]) == VDESC_NO_OFFSET)
break; /* stop at end of list */
if ((j = flags & VDESC_VP0_WILLPUT)) {
vp = *VOPARG_OFFSETTO(struct vnode**,offset,ap);
switch (j) {
case VDESC_VP0_WILLPUT:
vput(vp);
break;
case VDESC_VP0_WILLUNLOCK:
VOP_UNLOCK(vp, 0);
break;
case VDESC_VP0_WILLRELE:
vrele(vp);
break;
}
}
}
return (EOPNOTSUPP);
}
/*ARGSUSED*/
int
genfs_ebadf(v)
void *v;
{
return (EBADF);
}
/* ARGSUSED */
int
genfs_enoioctl(v)
void *v;
{
return (ENOTTY);
}
/*
* Eliminate all activity associated with the requested vnode
* and with all vnodes aliased to the requested vnode.
*/
int
genfs_revoke(v)
void *v;
{
struct vop_revoke_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp, *vq;
struct proc *p = curproc; /* XXX */
#ifdef DIAGNOSTIC
if ((ap->a_flags & REVOKEALL) == 0)
panic("genfs_revoke: not revokeall");
#endif
vp = ap->a_vp;
simple_lock(&vp->v_interlock);
if (vp->v_flag & VALIASED) {
/*
* If a vgone (or vclean) is already in progress,
* wait until it is done and return.
*/
if (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
simple_unlock(&vp->v_interlock);
tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
return (0);
}
/*
* Ensure that vp will not be vgone'd while we
* are eliminating its aliases.
*/
vp->v_flag |= VXLOCK;
simple_unlock(&vp->v_interlock);
while (vp->v_flag & VALIASED) {
simple_lock(&spechash_slock);
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type || vp == vq)
continue;
simple_unlock(&spechash_slock);
vgone(vq);
break;
}
if (vq == NULLVP)
simple_unlock(&spechash_slock);
}
/*
* Remove the lock so that vgone below will
* really eliminate the vnode after which time
* vgone will awaken any sleepers.
*/
simple_lock(&vp->v_interlock);
vp->v_flag &= ~VXLOCK;
}
vgonel(vp, p);
return (0);
}
/*
* Lock the node.
*/
int
genfs_lock(v)
void *v;
{
struct vop_lock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock));
}
/*
* Unlock the node.
*/
int
genfs_unlock(v)
void *v;
{
struct vop_unlock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE,
&vp->v_interlock));
}
/*
* Return whether or not the node is locked.
*/
int
genfs_islocked(v)
void *v;
{
struct vop_islocked_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return (lockstatus(&vp->v_lock));
}
/*
* Stubs to use when there is no locking to be done on the underlying object.
*/
int
genfs_nolock(v)
void *v;
{
struct vop_lock_args /* {
struct vnode *a_vp;
int a_flags;
struct proc *a_p;
} */ *ap = v;
/*
* Since we are not using the lock manager, we must clear
* the interlock here.
*/
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&ap->a_vp->v_interlock);
return (0);
}
int
genfs_nounlock(v)
void *v;
{
return (0);
}
int
genfs_noislocked(v)
void *v;
{
return (0);
}
/*
* Local lease check for NFS servers. Just set up args and let
* nqsrv_getlease() do the rest. If NFSSERVER is not in the kernel,
* this is a null operation.
*/
int
genfs_lease_check(v)
void *v;
{
#ifdef NFSSERVER
struct vop_lease_args /* {
struct vnode *a_vp;
struct proc *a_p;
struct ucred *a_cred;
int a_flag;
} */ *ap = v;
u_int32_t duration = 0;
int cache;
u_quad_t frev;
(void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
NQLOCALSLP, ap->a_p, (struct mbuf *)0, &cache, &frev, ap->a_cred);
return (0);
#else
return (0);
#endif /* NFSSERVER */
}
/*
* generic VM getpages routine.
* Return PG_BUSY pages for the given range,
* reading from backing store if necessary.
*/
int
genfs_getpages(v)
void *v;
{
struct vop_getpages_args /* {
struct vnode *a_vp;
voff_t a_offset;
vm_page_t *a_m;
int *a_count;
int a_centeridx;
vm_prot_t a_access_type;
int a_advice;
int a_flags;
} */ *ap = v;
off_t eof, offset, origoffset, startoffset, endoffset, raoffset;
daddr_t lbn, blkno;
int s, i, error, npages, orignpages, npgs, run, ridx, pidx, pcount;
int fs_bshift, fs_bsize, dev_bshift, dev_bsize;
int flags = ap->a_flags;
size_t bytes, iobytes, tailbytes, totalbytes, skipbytes;
vaddr_t kva;
struct buf *bp, *mbp;
struct vnode *vp = ap->a_vp;
struct uvm_object *uobj = &vp->v_uvm.u_obj;
struct vm_page *pgs[16]; /* XXXUBC 16 */
struct ucred *cred = curproc->p_ucred; /* XXXUBC curproc */
boolean_t async = (flags & PGO_SYNCIO) == 0;
boolean_t write = (ap->a_access_type & VM_PROT_WRITE) != 0;
boolean_t sawhole = FALSE;
UVMHIST_FUNC("genfs_getpages"); UVMHIST_CALLED(ubchist);
/* XXXUBC temp limit */
if (*ap->a_count > 16) {
return EINVAL;
}
error = VOP_SIZE(vp, vp->v_uvm.u_size, &eof);
if (error) {
return error;
}
#ifdef DIAGNOSTIC
if (ap->a_centeridx < 0 || ap->a_centeridx > *ap->a_count) {
panic("genfs_getpages: centeridx %d out of range",
ap->a_centeridx);
}
if (ap->a_offset & (PAGE_SIZE - 1) || ap->a_offset < 0) {
panic("genfs_getpages: offset 0x%x", (int)ap->a_offset);
}
if (*ap->a_count < 0) {
panic("genfs_getpages: count %d < 0", *ap->a_count);
}
#endif
/*
* Bounds-check the request.
*/
error = 0;
origoffset = ap->a_offset;
if (origoffset + (ap->a_centeridx << PAGE_SHIFT) >= eof &&
(flags & PGO_PASTEOF) == 0) {
if ((flags & PGO_LOCKED) == 0) {
simple_unlock(&uobj->vmobjlock);
}
UVMHIST_LOG(ubchist, "off 0x%x count %d goes past EOF 0x%x",
origoffset, *ap->a_count, eof,0);
return EINVAL;
}
/*
* For PGO_LOCKED requests, just return whatever's in memory.
*/
if (flags & PGO_LOCKED) {
uvn_findpages(uobj, origoffset, ap->a_count, ap->a_m,
UFP_NOWAIT|UFP_NOALLOC|UFP_NORDONLY);
return ap->a_m[ap->a_centeridx] == NULL ? EBUSY : 0;
}
/* vnode is VOP_LOCKed, uobj is locked */
if (write && (vp->v_flag & VONWORKLST) == 0) {
vn_syncer_add_to_worklist(vp, filedelay);
}
/*
* find the requested pages and make some simple checks.
* leave space in the page array for a whole block.
*/
fs_bshift = vp->v_mount->mnt_fs_bshift;
fs_bsize = 1 << fs_bshift;
dev_bshift = vp->v_mount->mnt_dev_bshift;
dev_bsize = 1 << dev_bshift;
KASSERT((eof & (dev_bsize - 1)) == 0);
orignpages = min(*ap->a_count,
round_page(eof - origoffset) >> PAGE_SHIFT);
if (flags & PGO_PASTEOF) {
orignpages = *ap->a_count;
}
npages = orignpages;
startoffset = origoffset & ~(fs_bsize - 1);
endoffset = round_page((origoffset + (npages << PAGE_SHIFT)
+ fs_bsize - 1) & ~(fs_bsize - 1));
endoffset = min(endoffset, round_page(eof));
ridx = (origoffset - startoffset) >> PAGE_SHIFT;
memset(pgs, 0, sizeof(pgs));
uvn_findpages(uobj, origoffset, &npages, &pgs[ridx], UFP_ALL);
/*
* if PGO_OVERWRITE is set, don't bother reading the pages.
* PGO_OVERWRITE also means that the caller guarantees
* that the pages already have backing store allocated.
*/
if (flags & PGO_OVERWRITE) {
UVMHIST_LOG(ubchist, "PGO_OVERWRITE",0,0,0,0);
for (i = 0; i < npages; i++) {
struct vm_page *pg = pgs[ridx + i];
if (pg->flags & PG_FAKE) {
uvm_pagezero(pg);
pg->flags &= ~(PG_FAKE);
}
pg->flags &= ~(PG_RDONLY);
}
goto out;
}
/*
* if the pages are already resident, just return them.
*/
for (i = 0; i < npages; i++) {
struct vm_page *pg = pgs[ridx + i];
if ((pg->flags & PG_FAKE) ||
(write && (pg->flags & PG_RDONLY))) {
break;
}
}
if (i == npages) {
UVMHIST_LOG(ubchist, "returning cached pages", 0,0,0,0);
raoffset = origoffset + (orignpages << PAGE_SHIFT);
goto raout;
}
/*
* the page wasn't resident and we're not overwriting,
* so we're going to have to do some i/o.
* find any additional pages needed to cover the expanded range.
*/
if (startoffset != origoffset) {
/*
* XXXUBC we need to avoid deadlocks caused by locking
* additional pages at lower offsets than pages we
* already have locked. for now, unlock them all and
* start over.
*/
for (i = 0; i < npages; i++) {
struct vm_page *pg = pgs[ridx + i];
if (pg->flags & PG_FAKE) {
pg->flags |= PG_RELEASED;
}
}
uvm_page_unbusy(&pgs[ridx], npages);
memset(pgs, 0, sizeof(pgs));
UVMHIST_LOG(ubchist, "reset npages start 0x%x end 0x%x",
startoffset, endoffset, 0,0);
npages = (endoffset - startoffset) >> PAGE_SHIFT;
npgs = npages;
uvn_findpages(uobj, startoffset, &npgs, pgs, UFP_ALL);
}
simple_unlock(&uobj->vmobjlock);
/*
* read the desired page(s).
*/
totalbytes = npages << PAGE_SHIFT;
bytes = min(totalbytes, eof - startoffset);
tailbytes = totalbytes - bytes;
skipbytes = 0;
kva = uvm_pagermapin(pgs, npages, UVMPAGER_MAPIN_WAITOK |
UVMPAGER_MAPIN_READ);
s = splbio();
mbp = pool_get(&bufpool, PR_WAITOK);
splx(s);
mbp->b_bufsize = totalbytes;
mbp->b_data = (void *)kva;
mbp->b_resid = mbp->b_bcount = bytes;
mbp->b_flags = B_BUSY|B_READ| (async ? B_CALL : 0);
mbp->b_iodone = uvm_aio_biodone;
mbp->b_vp = vp;
LIST_INIT(&mbp->b_dep);
/*
* if EOF is in the middle of the last page, zero the part past EOF.
*/
if (tailbytes > 0 && (pgs[bytes >> PAGE_SHIFT]->flags & PG_FAKE)) {
memset((void *)(kva + bytes), 0, tailbytes);
}
/*
* now loop over the pages, reading as needed.
*/
if (write) {
lockmgr(&vp->v_glock, LK_EXCLUSIVE, NULL);
} else {
lockmgr(&vp->v_glock, LK_SHARED, NULL);
}
bp = NULL;
for (offset = startoffset;
bytes > 0;
offset += iobytes, bytes -= iobytes) {
/*
* skip pages which don't need to be read.
*/
pidx = (offset - startoffset) >> PAGE_SHIFT;
while ((pgs[pidx]->flags & PG_FAKE) == 0) {
size_t b;
KASSERT((offset & (PAGE_SIZE - 1)) == 0);
b = min(PAGE_SIZE, bytes);
offset += b;
bytes -= b;
skipbytes += b;
pidx++;
UVMHIST_LOG(ubchist, "skipping, new offset 0x%x",
offset, 0,0,0);
if (bytes == 0) {
goto loopdone;
}
}
/*
* bmap the file to find out the blkno to read from and
* how much we can read in one i/o. if bmap returns an error,
* skip the rest of the top-level i/o.
*/
lbn = offset >> fs_bshift;
error = VOP_BMAP(vp, lbn, NULL, &blkno, &run);
if (error) {
UVMHIST_LOG(ubchist, "VOP_BMAP lbn 0x%x -> %d\n",
lbn, error,0,0);
skipbytes += bytes;
goto loopdone;
}
/*
* see how many pages can be read with this i/o.
* reduce the i/o size if necessary to avoid
* overwriting pages with valid data.
*/
iobytes = min(((lbn + 1 + run) << fs_bshift) - offset, bytes);
if (offset + iobytes > round_page(offset)) {
pcount = 1;
while (pidx + pcount < npages &&
pgs[pidx + pcount]->flags & PG_FAKE) {
pcount++;
}
iobytes = min(iobytes, (pcount << PAGE_SHIFT) -
(offset - trunc_page(offset)));
}
/*
* if this block isn't allocated, zero it instead of reading it.
* if this is a read access, mark the pages we zeroed PG_RDONLY.
*/
if (blkno < 0) {
UVMHIST_LOG(ubchist, "lbn 0x%x -> HOLE", lbn,0,0,0);
sawhole = TRUE;
memset((char *)kva + (offset - startoffset), 0,
iobytes);
skipbytes += iobytes;
if (!write) {
int holepages =
(round_page(offset + iobytes) -
trunc_page(offset)) >> PAGE_SHIFT;
for (i = 0; i < holepages; i++) {
pgs[pidx + i]->flags |= PG_RDONLY;
}
}
continue;
}
/*
* allocate a sub-buf for this piece of the i/o
* (or just use mbp if there's only 1 piece),
* and start it going.
*/
if (offset == startoffset && iobytes == bytes) {
bp = mbp;
} else {
s = splbio();
bp = pool_get(&bufpool, PR_WAITOK);
splx(s);
bp->b_data = (char *)kva + offset - startoffset;
bp->b_resid = bp->b_bcount = iobytes;
bp->b_flags = B_BUSY|B_READ|B_CALL;
bp->b_iodone = uvm_aio_biodone1;
bp->b_vp = vp;
LIST_INIT(&bp->b_dep);
}
bp->b_lblkno = 0;
bp->b_private = mbp;
/* adjust physical blkno for partial blocks */
bp->b_blkno = blkno + ((offset - (lbn << fs_bshift)) >>
dev_bshift);
UVMHIST_LOG(ubchist, "bp %p offset 0x%x bcount 0x%x blkno 0x%x",
bp, offset, iobytes, bp->b_blkno);
VOP_STRATEGY(bp);
}
loopdone:
if (skipbytes) {
s = splbio();
if (error) {
mbp->b_flags |= B_ERROR;
mbp->b_error = error;
}
mbp->b_resid -= skipbytes;
if (mbp->b_resid == 0) {
biodone(mbp);
}
splx(s);
}
if (async) {
UVMHIST_LOG(ubchist, "returning PEND",0,0,0,0);
lockmgr(&vp->v_glock, LK_RELEASE, NULL);
return EINPROGRESS;
}
if (bp != NULL) {
error = biowait(mbp);
}
s = splbio();
pool_put(&bufpool, mbp);
splx(s);
uvm_pagermapout(kva, npages);
raoffset = startoffset + totalbytes;
/*
* if this we encountered a hole then we have to do a little more work.
* for read faults, we marked the page PG_RDONLY so that future
* write accesses to the page will fault again.
* for write faults, we must make sure that the backing store for
* the page is completely allocated while the pages are locked.
*/
if (error == 0 && sawhole && write) {
error = VOP_BALLOCN(vp, startoffset, npages << PAGE_SHIFT,
cred, 0);
if (error) {
UVMHIST_LOG(ubchist, "balloc lbn 0x%x -> %d",
lbn, error,0,0);
lockmgr(&vp->v_glock, LK_RELEASE, NULL);
simple_lock(&uobj->vmobjlock);
goto out;
}
}
lockmgr(&vp->v_glock, LK_RELEASE, NULL);
simple_lock(&uobj->vmobjlock);
/*
* see if we want to start any readahead.
* XXXUBC for now, just read the next 128k on 64k boundaries.
* this is pretty nonsensical, but it is 50% faster than reading
* just the next 64k.
*/
raout:
if (!error && !async && !write && ((int)raoffset & 0xffff) == 0 &&
PAGE_SHIFT <= 16) {
int racount;
racount = 1 << (16 - PAGE_SHIFT);
(void) VOP_GETPAGES(vp, raoffset, NULL, &racount, 0,
VM_PROT_READ, 0, 0);
simple_lock(&uobj->vmobjlock);
racount = 1 << (16 - PAGE_SHIFT);
(void) VOP_GETPAGES(vp, raoffset + 0x10000, NULL, &racount, 0,
VM_PROT_READ, 0, 0);
simple_lock(&uobj->vmobjlock);
}
/*
* we're almost done! release the pages...
* for errors, we free the pages.
* otherwise we activate them and mark them as valid and clean.
* also, unbusy pages that were not actually requested.
*/
out:
if (error) {
uvm_lock_pageq();
for (i = 0; i < npages; i++) {
if (pgs[i] == NULL) {
continue;
}
UVMHIST_LOG(ubchist, "examining pg %p flags 0x%x",
pgs[i], pgs[i]->flags, 0,0);
if ((pgs[i]->flags & PG_FAKE) == 0) {
continue;
}
if (pgs[i]->flags & PG_WANTED) {
wakeup(pgs[i]);
}
uvm_pagefree(pgs[i]);
}
uvm_unlock_pageq();
simple_unlock(&uobj->vmobjlock);
UVMHIST_LOG(ubchist, "returning error %d", error,0,0,0);
return error;
}
UVMHIST_LOG(ubchist, "succeeding, npages %d", npages,0,0,0);
for (i = 0; i < npages; i++) {
if (pgs[i] == NULL) {
continue;
}
UVMHIST_LOG(ubchist, "examining pg %p flags 0x%x",
pgs[i], pgs[i]->flags, 0,0);
if (pgs[i]->flags & PG_FAKE) {
UVMHIST_LOG(ubchist, "unfaking pg %p offset 0x%x",
pgs[i], pgs[i]->offset,0,0);
pgs[i]->flags &= ~(PG_FAKE);
pmap_clear_modify(pgs[i]);
pmap_clear_reference(pgs[i]);
}
if (write) {
pgs[i]->flags &= ~(PG_RDONLY);
}
if (i < ridx || i >= ridx + orignpages || async) {
UVMHIST_LOG(ubchist, "unbusy pg %p offset 0x%x",
pgs[i], pgs[i]->offset,0,0);
if (pgs[i]->flags & PG_WANTED) {
wakeup(pgs[i]);
}
if (pgs[i]->wire_count == 0) {
uvm_pageactivate(pgs[i]);
}
pgs[i]->flags &= ~(PG_WANTED|PG_BUSY);
UVM_PAGE_OWN(pgs[i], NULL);
}
}
simple_unlock(&uobj->vmobjlock);
if (ap->a_m != NULL) {
memcpy(ap->a_m, &pgs[ridx],
orignpages * sizeof(struct vm_page *));
}
return 0;
}
/*
* generic VM putpages routine.
* Write the given range of pages to backing store.
*/
int
genfs_putpages(v)
void *v;
{
struct vop_putpages_args /* {
struct vnode *a_vp;
struct vm_page **a_m;
int a_count;
int a_flags;
int *a_rtvals;
} */ *ap = v;
int s, error, error2, npages, run;
int fs_bshift, dev_bshift, dev_bsize;
vaddr_t kva;
off_t eof, offset, startoffset;
size_t bytes, iobytes, skipbytes;
daddr_t lbn, blkno;
struct vm_page *pg;
struct buf *mbp, *bp;
struct vnode *vp = ap->a_vp;
boolean_t async = (ap->a_flags & PGO_SYNCIO) == 0;
UVMHIST_FUNC("genfs_putpages"); UVMHIST_CALLED(ubchist);
simple_unlock(&vp->v_uvm.u_obj.vmobjlock);
error = VOP_SIZE(vp, vp->v_uvm.u_size, &eof);
if (error) {
return error;
}
error = error2 = 0;
npages = ap->a_count;
fs_bshift = vp->v_mount->mnt_fs_bshift;
dev_bshift = vp->v_mount->mnt_dev_bshift;
dev_bsize = 1 << dev_bshift;
KASSERT((eof & (dev_bsize - 1)) == 0);
pg = ap->a_m[0];
startoffset = pg->offset;
bytes = min(npages << PAGE_SHIFT, eof - startoffset);
skipbytes = 0;
KASSERT(bytes != 0);
kva = uvm_pagermapin(ap->a_m, npages, UVMPAGER_MAPIN_WAITOK);
s = splbio();
vp->v_numoutput += 2;
mbp = pool_get(&bufpool, PR_WAITOK);
UVMHIST_LOG(ubchist, "vp %p mbp %p num now %d bytes 0x%x",
vp, mbp, vp->v_numoutput, bytes);
splx(s);
mbp->b_bufsize = npages << PAGE_SHIFT;
mbp->b_data = (void *)kva;
mbp->b_resid = mbp->b_bcount = bytes;
mbp->b_flags = B_BUSY|B_WRITE|B_AGE |
(async ? B_CALL : 0) |
(curproc == uvm.pagedaemon_proc ? B_PDAEMON : 0);
mbp->b_iodone = uvm_aio_biodone;
mbp->b_vp = vp;
LIST_INIT(&mbp->b_dep);
bp = NULL;
for (offset = startoffset;
bytes > 0;
offset += iobytes, bytes -= iobytes) {
lbn = offset >> fs_bshift;
error = VOP_BMAP(vp, lbn, NULL, &blkno, &run);
if (error) {
UVMHIST_LOG(ubchist, "VOP_BMAP() -> %d", error,0,0,0);
skipbytes += bytes;
bytes = 0;
break;
}
iobytes = min(((lbn + 1 + run) << fs_bshift) - offset, bytes);
if (blkno == (daddr_t)-1) {
skipbytes += iobytes;
continue;
}
/* if it's really one i/o, don't make a second buf */
if (offset == startoffset && iobytes == bytes) {
bp = mbp;
} else {
s = splbio();
vp->v_numoutput++;
bp = pool_get(&bufpool, PR_WAITOK);
UVMHIST_LOG(ubchist, "vp %p bp %p num now %d",
vp, bp, vp->v_numoutput, 0);
splx(s);
bp->b_data = (char *)kva +
(vaddr_t)(offset - pg->offset);
bp->b_resid = bp->b_bcount = iobytes;
bp->b_flags = B_BUSY|B_WRITE|B_CALL|B_ASYNC;
bp->b_iodone = uvm_aio_biodone1;
bp->b_vp = vp;
LIST_INIT(&bp->b_dep);
}
bp->b_lblkno = 0;
bp->b_private = mbp;
/* adjust physical blkno for partial blocks */
bp->b_blkno = blkno + ((offset - (lbn << fs_bshift)) >>
dev_bshift);
UVMHIST_LOG(ubchist, "vp %p offset 0x%x bcount 0x%x blkno 0x%x",
vp, offset, bp->b_bcount, bp->b_blkno);
VOP_STRATEGY(bp);
}
if (skipbytes) {
UVMHIST_LOG(ubchist, "skipbytes %d", bytes, 0,0,0);
s = splbio();
mbp->b_resid -= skipbytes;
if (mbp->b_resid == 0) {
biodone(mbp);
}
splx(s);
}
if (async) {
UVMHIST_LOG(ubchist, "returning PEND", 0,0,0,0);
return EINPROGRESS;
}
if (bp != NULL) {
UVMHIST_LOG(ubchist, "waiting for mbp %p", mbp,0,0,0);
error2 = biowait(mbp);
}
if (bioops.io_pageiodone) {
(*bioops.io_pageiodone)(mbp);
}
s = splbio();
vwakeup(mbp);
pool_put(&bufpool, mbp);
splx(s);
uvm_pagermapout(kva, npages);
UVMHIST_LOG(ubchist, "returning, error %d", error,0,0,0);
return error ? error : error2;
}
int
genfs_size(v)
void *v;
{
struct vop_size_args /* {
struct vnode *a_vp;
off_t a_size;
off_t *a_eobp;
} */ *ap = v;
int bsize;
bsize = 1 << ap->a_vp->v_mount->mnt_fs_bshift;
*ap->a_eobp = (ap->a_size + bsize - 1) & ~(bsize - 1);
return 0;
}
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