From af3e0bb202bf5b3770a5260c300faaf967ebf6dc Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Sat, 26 Apr 2003 07:42:24 +0000 Subject: [PATCH] - Lock the vm_object when performing vm_page_alloc() in allocbuf(). --- sys/kern/vfs_bio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index 00d3c0adf5f..8006f990c8f 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -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,