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Code Issues Releases Activity

- Add some of the required vm object locking, including assertions where

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the vm object lock is required and already held.
This commit is contained in:
Alan Cox 2003-10-25 23:42:17 +00:00
parent b89fbbb14b
commit ee3dc7d7fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=121517
1 changed files with 24 additions and 4 deletions
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28
sys/vm/swap_pager.c
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@ -491,14 +491,18 @@ swap_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
OFF_TO_IDX(offset + PAGE_MASK + size));
object->handle = handle;
VM_OBJECT_LOCK(object);
swp_pager_meta_build(object, 0, SWAPBLK_NONE);
VM_OBJECT_UNLOCK(object);
}
sx_xunlock(&sw_alloc_sx);
} else {
object = vm_object_allocate(OBJT_DEFAULT,
OFF_TO_IDX(offset + PAGE_MASK + size));
VM_OBJECT_LOCK(object);
swp_pager_meta_build(object, 0, SWAPBLK_NONE);
VM_OBJECT_UNLOCK(object);
}
mtx_unlock(&Giant);
return (object);
@ -722,6 +726,7 @@ swap_pager_reserve(vm_object_t object, vm_pindex_t start, vm_size_t size)
vm_pindex_t beg = start; /* save start index */
s = splvm();
VM_OBJECT_LOCK(object);
while (size) {
if (n == 0) {
n = BLIST_MAX_ALLOC;
@ -729,6 +734,7 @@ swap_pager_reserve(vm_object_t object, vm_pindex_t start, vm_size_t size)
n >>= 1;
if (n == 0) {
swp_pager_meta_free(object, beg, start - beg);
VM_OBJECT_UNLOCK(object);
splx(s);
return (-1);
}
@ -741,6 +747,7 @@ swap_pager_reserve(vm_object_t object, vm_pindex_t start, vm_size_t size)
--n;
}
swp_pager_meta_free(object, start, n);
VM_OBJECT_UNLOCK(object);
splx(s);
return (0);
}
@ -830,8 +837,11 @@ swap_pager_copy(vm_object_t srcobject, vm_object_t dstobject,
SWM_POP
);
if (srcaddr != SWAPBLK_NONE)
if (srcaddr != SWAPBLK_NONE) {
VM_OBJECT_LOCK(dstobject);
swp_pager_meta_build(dstobject, i, srcaddr);
VM_OBJECT_UNLOCK(dstobject);
}
} else {
/*
* Destination has valid swapblk or it is represented
@ -849,7 +859,9 @@ swap_pager_copy(vm_object_t srcobject, vm_object_t dstobject,
* double-remove the object from the swap queues.
*/
if (destroysource) {
VM_OBJECT_LOCK(srcobject);
swp_pager_meta_free_all(srcobject);
VM_OBJECT_UNLOCK(srcobject);
/*
* Reverting the type is not necessary, the caller is going
* to destroy srcobject directly, but I'm doing it here
@ -880,6 +892,7 @@ swap_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before, int *aft
daddr_t blk0;
int s;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
/*
* do we have good backing store at the requested index ?
*/
@ -954,6 +967,7 @@ static void
swap_pager_unswapped(vm_page_t m)
{
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
swp_pager_meta_ctl(m->object, m->pindex, SWM_FREE);
}
@ -1187,7 +1201,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
m[0]->object
);
}
VM_OBJECT_UNLOCK(object);
/*
* Step 1
*
@ -1197,6 +1211,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
*/
if (object->type != OBJT_SWAP)
swp_pager_meta_build(object, 0, SWAPBLK_NONE);
VM_OBJECT_UNLOCK(object);
if (curproc != pageproc)
sync = TRUE;
@ -1298,6 +1313,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
bp->b_bufsize = PAGE_SIZE * n;
bp->b_blkno = blk;
VM_OBJECT_LOCK(object);
for (j = 0; j < n; ++j) {
vm_page_t mreq = m[i+j];
@ -1314,6 +1330,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
vm_page_unlock_queues();
bp->b_pages[j] = mreq;
}
VM_OBJECT_UNLOCK(object);
bp->b_npages = n;
/*
* Must set dirty range for NFS to work.
@ -1775,6 +1792,7 @@ swp_pager_meta_build(vm_object_t object, vm_pindex_t pindex, daddr_t swapblk)
int idx;
GIANT_REQUIRED;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
/*
* Convert default object to swap object if necessary
*/
@ -1815,7 +1833,9 @@ swp_pager_meta_build(vm_object_t object, vm_pindex_t pindex, daddr_t swapblk)
swap = *pswap = uma_zalloc(swap_zone, M_NOWAIT);
if (swap == NULL) {
VM_OBJECT_UNLOCK(object);
VM_WAIT;
VM_OBJECT_LOCK(object);
goto retry;
}
@ -1864,7 +1884,7 @@ static void
swp_pager_meta_free(vm_object_t object, vm_pindex_t index, daddr_t count)
{
GIANT_REQUIRED;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
if (object->type != OBJT_SWAP)
return;
@ -1911,7 +1931,7 @@ swp_pager_meta_free_all(vm_object_t object)
daddr_t index = 0;
GIANT_REQUIRED;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
if (object->type != OBJT_SWAP)
return;