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Remove ENABLE_VFS_IOOPT. It is a long unfinished work-in-progress.

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Discussed on:	arch@
This commit is contained in:
Alan Cox 2003-03-06 03:41:02 +00:00
parent 1b2c2ab29a
commit 09c80124a3
12 changed files with 2 additions and 635 deletions
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15
sys/conf/NOTES
View File

@ -756,21 +756,6 @@ options EXT2FS
# unsuitable for inclusion on machines with untrusted local users.
options VFS_AIO
# Enable the code UFS IO optimization through the VM system. This allows
# use VM operations instead of copying operations when possible.
#
# Even with this enabled, actual use of the code is still controlled by the
# sysctl vfs.ioopt. 0 gives no optimization, 1 gives normal (use VM
# operations if a request happens to fit), 2 gives agressive optimization
# (the operations are split to do as much as possible through the VM system.)
#
# Enabling this will probably not give an overall speedup except for
# special workloads.
#
# WARNING: Do not enable this, it is known to be broken, and will result
# in system instability, as well as possible data loss.
options ENABLE_VFS_IOOPT
# Cryptographically secure random number generator; /dev/[u]random
device random

1
sys/conf/options
View File

@ -460,7 +460,6 @@ DEBUG_LOCKS opt_global.h
DEBUG_VFS_LOCKS opt_global.h
LOOKUP_SHARED opt_global.h
DIAGNOSTIC opt_global.h
ENABLE_VFS_IOOPT opt_global.h
INVARIANT_SUPPORT opt_global.h
INVARIANTS opt_global.h
MCLSHIFT opt_global.h

108
sys/kern/kern_subr.c
View File

@ -59,8 +59,6 @@
#include <vm/vm_map.h>
#ifdef ZERO_COPY_SOCKETS
#include <vm/vm_param.h>
#endif
#if defined(ZERO_COPY_SOCKETS) || defined(ENABLE_VFS_IOOPT)
#include <vm/vm_object.h>
#endif
@ -197,7 +195,7 @@ uiomove(void *cp, int n, struct uio *uio)
return (error);
}
#if defined(ENABLE_VFS_IOOPT) || defined(ZERO_COPY_SOCKETS)
#ifdef ZERO_COPY_SOCKETS
/*
* Experimental support for zero-copy I/O
*/
@ -209,9 +207,6 @@ userspaceco(void *cp, u_int cnt, struct uio *uio, struct vm_object *obj,
int error;
iov = uio->uio_iov;
#ifdef ZERO_COPY_SOCKETS
if (uio->uio_rw == UIO_READ) {
if ((so_zero_copy_receive != 0)
&& (obj != NULL)
@ -240,43 +235,12 @@ userspaceco(void *cp, u_int cnt, struct uio *uio, struct vm_object *obj,
*/
if (error != 0)
error = copyout(cp, iov->iov_base, cnt);
#ifdef ENABLE_VFS_IOOPT
} else if ((vfs_ioopt != 0)
&& ((cnt & PAGE_MASK) == 0)
&& ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
&& ((uio->uio_offset & PAGE_MASK) == 0)
&& ((((intptr_t) cp) & PAGE_MASK) == 0)) {
error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
uio->uio_offset, cnt,
(vm_offset_t) iov->iov_base, NULL);
#endif /* ENABLE_VFS_IOOPT */
} else {
error = copyout(cp, iov->iov_base, cnt);
}
} else {
error = copyin(iov->iov_base, cp, cnt);
}
#else /* ZERO_COPY_SOCKETS */
if (uio->uio_rw == UIO_READ) {
#ifdef ENABLE_VFS_IOOPT
if ((vfs_ioopt != 0)
&& ((cnt & PAGE_MASK) == 0)
&& ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0)
&& ((uio->uio_offset & PAGE_MASK) == 0)
&& ((((intptr_t) cp) & PAGE_MASK) == 0)) {
error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
uio->uio_offset, cnt,
(vm_offset_t) iov->iov_base, NULL);
} else
#endif /* ENABLE_VFS_IOOPT */
{
error = copyout(cp, iov->iov_base, cnt);
}
} else {
error = copyin(iov->iov_base, cp, cnt);
}
#endif /* ZERO_COPY_SOCKETS */
return (error);
}
@ -334,75 +298,7 @@ uiomoveco(void *cp, int n, struct uio *uio, struct vm_object *obj,
}
return (0);
}
#endif /* ENABLE_VFS_IOOPT || ZERO_COPY_SOCKETS */
#ifdef ENABLE_VFS_IOOPT
/*
* Experimental support for zero-copy I/O
*/
int
uioread(int n, struct uio *uio, struct vm_object *obj, int *nread)
{
int npagesmoved;
struct iovec *iov;
u_int cnt, tcnt;
int error;
*nread = 0;
if (vfs_ioopt < 2)
return 0;
error = 0;
while (n > 0 && uio->uio_resid) {
iov = uio->uio_iov;
cnt = iov->iov_len;
if (cnt == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
continue;
}
if (cnt > n)
cnt = n;
if ((uio->uio_segflg == UIO_USERSPACE) &&
((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
((uio->uio_offset & PAGE_MASK) == 0) ) {
if (cnt < PAGE_SIZE)
break;
cnt &= ~PAGE_MASK;
if (ticks - PCPU_GET(switchticks) >= hogticks)
uio_yield();
error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
uio->uio_offset, cnt,
(vm_offset_t) iov->iov_base, &npagesmoved);
if (npagesmoved == 0)
break;
tcnt = npagesmoved * PAGE_SIZE;
cnt = tcnt;
if (error)
break;
iov->iov_base = (char *)iov->iov_base + cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;
uio->uio_offset += cnt;
*nread += cnt;
n -= cnt;
} else {
break;
}
}
return error;
}
#endif /* ENABLE_VFS_IOOPT */
#endif /* ZERO_COPY_SOCKETS */
/*
* Give next character to user as result of read.

6
sys/kern/vfs_subr.c
View File

@ -130,12 +130,6 @@ SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, "
static int nameileafonly;
SYSCTL_INT(_vfs, OID_AUTO, nameileafonly, CTLFLAG_RW, &nameileafonly, 0, "");
#ifdef ENABLE_VFS_IOOPT
/* See NOTES for a description of this setting. */
int vfs_ioopt;
SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, "");
#endif
/*
* Cache for the mount type id assigned to NFS. This is used for
* special checks in nfs/nfs_nqlease.c and vm/vnode_pager.c.

1
sys/sys/uio.h
View File

@ -88,7 +88,6 @@ struct vm_object;
void uio_yield(void);
int uiomove(void *, int, struct uio *);
int uiomoveco(void *, int, struct uio *, struct vm_object *, int);
int uioread(int, struct uio *, struct vm_object *, int *);
int copyinfrom(const void *src, void *dst, size_t len, int seg);
int copyinstrfrom(const void *src, void *dst, size_t len,
size_t *copied, int seg);

108
sys/ufs/ffs/ffs_vnops.c
View File

@ -389,45 +389,6 @@ ffs_read(ap)
vm_object_reference(object);
}
#ifdef ENABLE_VFS_IOOPT
/*
* If IO optimisation is turned on,
* and we are NOT a VM based IO request,
* (i.e. not headed for the buffer cache)
* but there IS a vm object associated with it.
*/
if ((ioflag & IO_VMIO) == 0 && (vfs_ioopt > 1) && object) {
int nread, toread;
toread = uio->uio_resid;
if (toread > bytesinfile)
toread = bytesinfile;
if (toread >= PAGE_SIZE) {
/*
* Then if it's at least a page in size, try
* get the data from the object using vm tricks
*/
error = uioread(toread, uio, object, &nread);
if ((uio->uio_resid == 0) || (error != 0)) {
/*
* If we finished or there was an error
* then finish up (the reference previously
* obtained on object must be released).
*/
if ((error == 0 ||
uio->uio_resid != orig_resid) &&
(vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
ip->i_flag |= IN_ACCESS;
if (object) {
vm_object_vndeallocate(object);
}
return error;
}
}
}
#endif
/*
* Ok so we couldn't do it all in one vm trick...
* so cycle around trying smaller bites..
@ -435,52 +396,6 @@ ffs_read(ap)
for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
break;
#ifdef ENABLE_VFS_IOOPT
if ((ioflag & IO_VMIO) == 0 && (vfs_ioopt > 1) && object) {
/*
* Obviously we didn't finish above, but we
* didn't get an error either. Try the same trick again.
* but this time we are looping.
*/
int nread, toread;
toread = uio->uio_resid;
if (toread > bytesinfile)
toread = bytesinfile;
/*
* Once again, if there isn't enough for a
* whole page, don't try optimising.
*/
if (toread >= PAGE_SIZE) {
error = uioread(toread, uio, object, &nread);
if ((uio->uio_resid == 0) || (error != 0)) {
/*
* If we finished or there was an
* error then finish up (the reference
* previously obtained on object must
* be released).
*/
if ((error == 0 ||
uio->uio_resid != orig_resid) &&
(vp->v_mount->mnt_flag &
MNT_NOATIME) == 0)
ip->i_flag |= IN_ACCESS;
if (object) {
vm_object_vndeallocate(object);
}
return error;
}
/*
* To get here we didnt't finish or err.
* If we did get some data,
* loop to try another bite.
*/
if (nread > 0) {
continue;
}
}
}
#endif
lbn = lblkno(fs, uio->uio_offset);
nextlbn = lbn + 1;
@ -575,22 +490,6 @@ ffs_read(ap)
xfersize = size;
}
#ifdef ENABLE_VFS_IOOPT
if (vfs_ioopt && object &&
(bp->b_flags & B_VMIO) &&
((blkoffset & PAGE_MASK) == 0) &&
((xfersize & PAGE_MASK) == 0)) {
/*
* If VFS IO optimisation is turned on,
* and it's an exact page multiple
* And a normal VM based op,
* then use uiomiveco()
*/
error =
uiomoveco((char *)bp->b_data + blkoffset,
(int)xfersize, uio, object, 0);
} else
#endif
{
/*
* otherwise use the general form
@ -755,13 +654,6 @@ ffs_write(ap)
if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
flags |= IO_SYNC;
#ifdef ENABLE_VFS_IOOPT
if (object && (object->flags & OBJ_OPT)) {
vm_freeze_copyopts(object,
OFF_TO_IDX(uio->uio_offset),
OFF_TO_IDX(uio->uio_offset + uio->uio_resid + PAGE_MASK));
}
#endif
for (error = 0; uio->uio_resid > 0;) {
lbn = lblkno(fs, uio->uio_offset);
blkoffset = blkoff(fs, uio->uio_offset);

7
sys/vm/vm_fault.c
View File

@ -280,13 +280,6 @@ RetryFault:;
fs.vp = vnode_pager_lock(fs.first_object);
vm_object_pip_add(fs.first_object, 1);
#ifdef ENABLE_VFS_IOOPT
if ((fault_type & VM_PROT_WRITE) &&
(fs.first_object->type == OBJT_VNODE)) {
vm_freeze_copyopts(fs.first_object,
fs.first_pindex, fs.first_pindex + 1);
}
#endif
fs.lookup_still_valid = TRUE;
if (wired)

249
sys/vm/vm_map.c
View File

@ -2879,255 +2879,6 @@ vm_map_lookup_done(vm_map_t map, vm_map_entry_t entry)
vm_map_unlock_read(map);
}
#ifdef ENABLE_VFS_IOOPT
/*
* Experimental support for zero-copy I/O
*
* Implement uiomove with VM operations. This handles (and collateral changes)
* support every combination of source object modification, and COW type
* operations.
*/
int
vm_uiomove(
vm_map_t mapa,
vm_object_t srcobject,
off_t cp,
int cnta,
vm_offset_t uaddra,
int *npages)
{
vm_map_t map;
vm_object_t first_object, oldobject, object;
vm_map_entry_t entry;
vm_prot_t prot;
boolean_t wired;
int tcnt, rv;
vm_offset_t uaddr, start, end, tend;
vm_pindex_t first_pindex, oindex;
vm_size_t osize;
off_t ooffset;
int cnt;
GIANT_REQUIRED;
if (npages)
*npages = 0;
cnt = cnta;
uaddr = uaddra;
while (cnt > 0) {
map = mapa;
if ((vm_map_lookup(&map, uaddr,
VM_PROT_READ, &entry, &first_object,
&first_pindex, &prot, &wired)) != KERN_SUCCESS) {
return EFAULT;
}
vm_map_clip_start(map, entry, uaddr);
tcnt = cnt;
tend = uaddr + tcnt;
if (tend > entry->end) {
tcnt = entry->end - uaddr;
tend = entry->end;
}
vm_map_clip_end(map, entry, tend);
start = entry->start;
end = entry->end;
osize = atop(tcnt);
oindex = OFF_TO_IDX(cp);
if (npages) {
vm_size_t idx;
for (idx = 0; idx < osize; idx++) {
vm_page_t m;
if ((m = vm_page_lookup(srcobject, oindex + idx)) == NULL) {
vm_map_lookup_done(map, entry);
return 0;
}
/*
* disallow busy or invalid pages, but allow
* m->busy pages if they are entirely valid.
*/
if ((m->flags & PG_BUSY) ||
((m->valid & VM_PAGE_BITS_ALL) != VM_PAGE_BITS_ALL)) {
vm_map_lookup_done(map, entry);
return 0;
}
}
}
/*
* If we are changing an existing map entry, just redirect
* the object, and change mappings.
*/
if ((first_object->type == OBJT_VNODE) &&
((oldobject = entry->object.vm_object) == first_object)) {
if ((entry->offset != cp) || (oldobject != srcobject)) {
/*
* Remove old window into the file
*/
vm_page_lock_queues();
pmap_remove(map->pmap, uaddr, tend);
vm_page_unlock_queues();
/*
* Force copy on write for mmaped regions
*/
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
/*
* Point the object appropriately
*/
if (oldobject != srcobject) {
/*
* Set the object optimization hint flag
*/
vm_object_set_flag(srcobject, OBJ_OPT);
vm_object_reference(srcobject);
entry->object.vm_object = srcobject;
if (oldobject) {
vm_object_deallocate(oldobject);
}
}
entry->offset = cp;
map->timestamp++;
} else {
vm_page_lock_queues();
pmap_remove(map->pmap, uaddr, tend);
vm_page_unlock_queues();
}
} else if ((first_object->ref_count == 1) &&
(first_object->size == osize) &&
((first_object->type == OBJT_DEFAULT) ||
(first_object->type == OBJT_SWAP)) ) {
oldobject = first_object->backing_object;
if ((first_object->backing_object_offset != cp) ||
(oldobject != srcobject)) {
/*
* Remove old window into the file
*/
vm_page_lock_queues();
pmap_remove(map->pmap, uaddr, tend);
vm_page_unlock_queues();
/*
* Remove unneeded old pages
*/
vm_object_lock(first_object);
vm_object_page_remove(first_object, 0, 0, 0);
vm_object_unlock(first_object);
/*
* Invalidate swap space
*/
if (first_object->type == OBJT_SWAP) {
swap_pager_freespace(first_object,
0,
first_object->size);
}
/*
* Force copy on write for mmaped regions
*/
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
/*
* Point the object appropriately
*/
if (oldobject != srcobject) {
/*
* Set the object optimization hint flag
*/
vm_object_set_flag(srcobject, OBJ_OPT);
vm_object_reference(srcobject);
if (oldobject) {
TAILQ_REMOVE(&oldobject->shadow_head,
first_object, shadow_list);
oldobject->shadow_count--;
/* XXX bump generation? */
vm_object_deallocate(oldobject);
}
TAILQ_INSERT_TAIL(&srcobject->shadow_head,
first_object, shadow_list);
srcobject->shadow_count++;
/* XXX bump generation? */
first_object->backing_object = srcobject;
}
first_object->backing_object_offset = cp;
map->timestamp++;
} else {
vm_page_lock_queues();
pmap_remove(map->pmap, uaddr, tend);
vm_page_unlock_queues();
}
/*
* Otherwise, we have to do a logical mmap.
*/
} else {
vm_object_set_flag(srcobject, OBJ_OPT);
vm_object_reference(srcobject);
vm_page_lock_queues();
pmap_remove(map->pmap, uaddr, tend);
vm_page_unlock_queues();
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
vm_map_lock_upgrade(map);
if (entry == &map->header) {
map->first_free = &map->header;
} else if (map->first_free->start >= start) {
map->first_free = entry->prev;
}
vm_map_entry_delete(map, entry);
object = srcobject;
ooffset = cp;
rv = vm_map_insert(map, object, ooffset, start, tend,
VM_PROT_ALL, VM_PROT_ALL, MAP_COPY_ON_WRITE);
if (rv != KERN_SUCCESS)
panic("vm_uiomove: could not insert new entry: %d", rv);
}
/*
* Map the window directly, if it is already in memory
*/
pmap_object_init_pt(map->pmap, uaddr,
srcobject, oindex, tcnt, 0);
map->timestamp++;
vm_map_unlock(map);
cnt -= tcnt;
uaddr += tcnt;
cp += tcnt;
if (npages)
*npages += osize;
}
return 0;
}
#endif
#include "opt_ddb.h"
#ifdef DDB
#include <sys/kernel.h>

1
sys/vm/vm_map.h
View File

@ -322,6 +322,5 @@ int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
boolean_t user_wire);
int vmspace_swap_count (struct vmspace *vmspace);
int vm_uiomove(vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
#endif /* _KERNEL */
#endif /* _VM_MAP_ */

134
sys/vm/vm_object.c
View File

@ -407,9 +407,6 @@ vm_object_vndeallocate(vm_object_t object)
if (object->ref_count == 0) {
mp_fixme("Unlocked vflag access.");
vp->v_vflag &= ~VV_TEXT;
#ifdef ENABLE_VFS_IOOPT
vm_object_clear_flag(object, OBJ_OPT);
#endif
}
/*
* vrele may need a vop lock
@ -502,10 +499,6 @@ vm_object_deallocate(vm_object_t object)
if (temp) {
TAILQ_REMOVE(&temp->shadow_head, object, shadow_list);
temp->shadow_count--;
#ifdef ENABLE_VFS_IOOPT
if (temp->ref_count == 0)
vm_object_clear_flag(temp, OBJ_OPT);
#endif
temp->generation++;
object->backing_object = NULL;
}
@ -556,12 +549,6 @@ vm_object_terminate(vm_object_t object)
if (object->type == OBJT_VNODE) {
struct vnode *vp;
#ifdef ENABLE_VFS_IOOPT
/*
* Freeze optimized copies.
*/
vm_freeze_copyopts(object, 0, object->size);
#endif
/*
* Clean pages and flush buffers.
*/
@ -937,39 +924,6 @@ vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int curgeneration,
return(maxf + 1);
}
#ifdef ENABLE_VFS_IOOPT
/*
* Same as vm_object_pmap_copy, except range checking really
* works, and is meant for small sections of an object.
*
* This code protects resident pages by making them read-only
* and is typically called on a fork or split when a page
* is converted to copy-on-write.
*
* NOTE: If the page is already at VM_PROT_NONE, calling
* pmap_page_protect will have no effect.
*/
void
vm_object_pmap_copy_1(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
{
vm_pindex_t idx;
vm_page_t p;
GIANT_REQUIRED;
if (object == NULL || (object->flags & OBJ_WRITEABLE) == 0)
return;
vm_page_lock_queues();
for (idx = start; idx < end; idx++) {
p = vm_page_lookup(object, idx);
if (p == NULL)
continue;
pmap_page_protect(p, VM_PROT_READ);
}
vm_page_unlock_queues();
}
#endif
/*
* vm_object_madvise:
*
@ -1852,94 +1806,6 @@ vm_object_set_writeable_dirty(vm_object_t object)
}
}
#ifdef ENABLE_VFS_IOOPT
/*
* Experimental support for zero-copy I/O
*
* Performs the copy_on_write operations necessary to allow the virtual copies
* into user space to work. This has to be called for write(2) system calls
* from other processes, file unlinking, and file size shrinkage.
*/
void
vm_freeze_copyopts(vm_object_t object, vm_pindex_t froma, vm_pindex_t toa)
{
int rv;
vm_object_t robject;
vm_pindex_t idx;
GIANT_REQUIRED;
if ((object == NULL) ||
((object->flags & OBJ_OPT) == 0))
return;
if (object->shadow_count > object->ref_count)
panic("vm_freeze_copyopts: sc > rc");
while ((robject = TAILQ_FIRST(&object->shadow_head)) != NULL) {
vm_pindex_t bo_pindex;
vm_page_t m_in, m_out;
bo_pindex = OFF_TO_IDX(robject->backing_object_offset);
vm_object_reference(robject);
vm_object_pip_wait(robject, "objfrz");
if (robject->ref_count == 1) {
vm_object_deallocate(robject);
continue;
}
vm_object_pip_add(robject, 1);
for (idx = 0; idx < robject->size; idx++) {
m_out = vm_page_grab(robject, idx,
VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
if (m_out->valid == 0) {
m_in = vm_page_grab(object, bo_pindex + idx,
VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
vm_page_lock_queues();
if (m_in->valid == 0) {
vm_page_unlock_queues();
rv = vm_pager_get_pages(object, &m_in, 1, 0);
if (rv != VM_PAGER_OK) {
printf("vm_freeze_copyopts: cannot read page from file: %lx\n", (long)m_in->pindex);
continue;
}
vm_page_lock_queues();
vm_page_deactivate(m_in);
}
pmap_remove_all(m_in);
vm_page_unlock_queues();
pmap_copy_page(m_in, m_out);
vm_page_lock_queues();
m_out->valid = m_in->valid;
vm_page_dirty(m_out);
vm_page_activate(m_out);
vm_page_wakeup(m_in);
} else
vm_page_lock_queues();
vm_page_wakeup(m_out);
vm_page_unlock_queues();
}
object->shadow_count--;
object->ref_count--;
TAILQ_REMOVE(&object->shadow_head, robject, shadow_list);
robject->backing_object = NULL;
robject->backing_object_offset = 0;
vm_object_pip_wakeup(robject);
vm_object_deallocate(robject);
}
vm_object_clear_flag(object, OBJ_OPT);
}
#endif
#include "opt_ddb.h"
#ifdef DDB
#include <sys/kernel.h>

4
sys/vm/vm_object.h
View File

@ -151,7 +151,6 @@ struct vm_object {
#define OBJ_WRITEABLE 0x0080 /* object has been made writable */
#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */
#define OBJ_CLEANING 0x0200
#define OBJ_OPT 0x1000 /* I/O optimization */
#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
@ -176,8 +175,6 @@ extern vm_object_t kmem_object;
#define vm_object_unlock(object) \
mtx_unlock((object) == kmem_object ? &kmem_object->mtx : &Giant)
void vm_freeze_copyopts(vm_object_t, vm_pindex_t, vm_pindex_t);
void vm_object_set_flag(vm_object_t object, u_short bits);
void vm_object_clear_flag(vm_object_t object, u_short bits);
void vm_object_pip_add(vm_object_t object, short i);
@ -199,7 +196,6 @@ void vm_object_set_writeable_dirty (vm_object_t);
void vm_object_init (void);
void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
void vm_object_pmap_copy_1 (vm_object_t, vm_pindex_t, vm_pindex_t);
void vm_object_reference (vm_object_t);
void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
void vm_object_split(vm_map_entry_t);

3
sys/vm/vnode_pager.c
View File

@ -307,9 +307,6 @@ vnode_pager_setsize(vp, nsize)
* File has shrunk. Toss any cached pages beyond the new EOF.
*/
if (nsize < object->un_pager.vnp.vnp_size) {
#ifdef ENABLE_VFS_IOOPT
vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size);
#endif
if (nobjsize < object->size) {
vm_object_lock(object);
vm_object_page_remove(object, nobjsize, object->size,