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nfs: support page groups in nfs_read_completion 

nfs_read_completion relied on the fact that there was a 1:1 mapping
of page to nfs_request, but this has now changed.

Regions not covered by a request have already been zeroed elsewhere.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
hifive-unleashed-5.1
Weston Andros Adamson 2014-05-15 11:56:57 -04:00 committed by Trond Myklebust
parent c6194271f9
commit 68072992c8
1 changed files with 17 additions and 7 deletions
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24
fs/nfs/read.c
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@ -130,7 +130,6 @@ static void nfs_page_group_set_uptodate(struct nfs_page *req)
SetPageUptodate(req->wb_page);
}
/* Note io was page aligned */
static void nfs_read_completion(struct nfs_pgio_header *hdr)
{
unsigned long bytes = 0;
@ -140,14 +139,25 @@ static void nfs_read_completion(struct nfs_pgio_header *hdr)
while (!list_empty(&hdr->pages)) {
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
struct page *page = req->wb_page;
unsigned long start = req->wb_pgbase;
unsigned long end = req->wb_pgbase + req->wb_bytes;
if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) {
if (bytes > hdr->good_bytes)
zero_user(page, 0, PAGE_SIZE);
else if (hdr->good_bytes - bytes < PAGE_SIZE)
zero_user_segment(page,
hdr->good_bytes & ~PAGE_MASK,
PAGE_SIZE);
/* note: regions of the page not covered by a
* request are zeroed in nfs_readpage_async /
* readpage_async_filler */
if (bytes > hdr->good_bytes) {
/* nothing in this request was good, so zero
* the full extent of the request */
zero_user_segment(page, start, end);
} else if (hdr->good_bytes - bytes < req->wb_bytes) {
/* part of this request has good bytes, but
* not all. zero the bad bytes */
start += hdr->good_bytes - bytes;
WARN_ON(start < req->wb_pgbase);
zero_user_segment(page, start, end);
}
}
bytes += req->wb_bytes;
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) {