Differential D21594 Diff 62941 sys/fs/nfsclient/nfs_clbio.c

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sys/fs/nfsclient/nfs_clbio.c

Show First 20 Lines • Show All 168 Lines • ▼ Show 20 Lines	ncl_getpages(struct vop_getpages_args *ap)
/*		/*
* If the requested page is partially valid, just return it and		* If the requested page is partially valid, just return it and
* allow the pager to zero-out the blanks. Partially valid pages		* allow the pager to zero-out the blanks. Partially valid pages
* can only occur at the file EOF.		* can only occur at the file EOF.
*		*
* XXXGL: is that true for NFS, where short read can occur???		* XXXGL: is that true for NFS, where short read can occur???
*/		*/
VM_OBJECT_WLOCK(object);		VM_OBJECT_WLOCK(object);
if (pages[npages - 1]->valid != 0 && --npages == 0)		if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0)
goto out;		goto out;
VM_OBJECT_WUNLOCK(object);		VM_OBJECT_WUNLOCK(object);

/*		/*
* We use only the kva address for the buffer, but this is extremely		* We use only the kva address for the buffer, but this is extremely
* convenient and fast.		* convenient and fast.
*/		*/
bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);		bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);
Show All 36 Lines	for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
vm_page_t m;		vm_page_t m;
nextoff = toff + PAGE_SIZE;		nextoff = toff + PAGE_SIZE;
m = pages[i];		m = pages[i];

if (nextoff <= size) {		if (nextoff <= size) {
/*		/*
* Read operation filled an entire page		* Read operation filled an entire page
*/		*/
m->valid = VM_PAGE_BITS_ALL;		vm_page_valid(m);
KASSERT(m->dirty == 0,		KASSERT(m->dirty == 0,
("nfs_getpages: page %p is dirty", m));		("nfs_getpages: page %p is dirty", m));
} else if (size > toff) {		} else if (size > toff) {
/*		/*
* Read operation filled a partial page.		* Read operation filled a partial page.
*/		*/
m->valid = 0;		vm_page_invalid(m);
vm_page_set_valid_range(m, 0, size - toff);		vm_page_set_valid_range(m, 0, size - toff);
KASSERT(m->dirty == 0,		KASSERT(m->dirty == 0,
("nfs_getpages: page %p is dirty", m));		("nfs_getpages: page %p is dirty", m));
} else {		} else {
/*		/*
* Read operation was short. If no error		* Read operation was short. If no error
* occurred we may have hit a zero-fill		* occurred we may have hit a zero-fill
* section. We leave valid set to 0, and page		* section. We leave valid set to 0, and page
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