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- Lock the vm_object when performing vm_page_alloc() in allocbuf().

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This commit is contained in:
alc 2003-04-26 07:42:24 +00:00
parent a1831ac622
commit 3db24e0c46
1 changed files with 4 additions and 0 deletions
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4
sys/kern/vfs_bio.c
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@ -2816,6 +2816,7 @@ allocbuf(struct buf *bp, int size)
vp = bp->b_vp;
obj = bp->b_object;
VM_OBJECT_LOCK(obj);
while (bp->b_npages < desiredpages) {
vm_page_t m;
vm_pindex_t pi;
@ -2833,7 +2834,9 @@ allocbuf(struct buf *bp, int size)
if (m == NULL) {
atomic_add_int(&vm_pageout_deficit,
desiredpages - bp->b_npages);
VM_OBJECT_UNLOCK(obj);
VM_WAIT;
VM_OBJECT_LOCK(obj);
} else {
vm_page_lock_queues();
vm_page_wakeup(m);
@ -2876,6 +2879,7 @@ allocbuf(struct buf *bp, int size)
bp->b_pages[bp->b_npages] = m;
++bp->b_npages;
}
VM_OBJECT_UNLOCK(obj);
/*
* Step 2. We've loaded the pages into the buffer,