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Change vnode_pager_generic_getpages() so that it does not panic if the

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given file is sparse.  Instead, it zeroes the requested page.

Reviewed by: tegge
PR: kern/98116
MFC after: 3 days
This commit is contained in:
Alan Cox 2006-10-08 20:26:16 +00:00
parent 8ea32c5e36
commit f4f83da02d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=163140
1 changed files with 13 additions and 2 deletions
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15
sys/vm/vnode_pager.c
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@ -695,7 +695,7 @@ vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
vm_offset_t kva;
off_t foff, tfoff, nextoff;
int i, j, size, bsize, first;
daddr_t firstaddr;
daddr_t firstaddr, reqblock;
struct bufobj *bo;
int runpg;
int runend;
@ -724,7 +724,7 @@ vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
/*
* if we can't bmap, use old VOP code
*/
if (VOP_BMAP(vp, 0, &bo, 0, NULL, NULL)) {
if (VOP_BMAP(vp, foff / bsize, &bo, &reqblock, NULL, NULL)) {
VM_OBJECT_LOCK(object);
vm_page_lock_queues();
for (i = 0; i < count; i++)
@ -770,6 +770,17 @@ vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(object);
return VM_PAGER_OK;
} else if (reqblock == -1) {
pmap_zero_page(m[reqpage]);
vm_page_undirty(m[reqpage]);
m[reqpage]->valid = VM_PAGE_BITS_ALL;
vm_page_lock_queues();
for (i = 0; i < count; i++)
if (i != reqpage)
vm_page_free(m[i]);
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(object);
return (VM_PAGER_OK);
}
m[reqpage]->valid = 0;
VM_OBJECT_UNLOCK(object);