diff options
| author | Weston Andros Adamson <dros@primarydata.com> | 2014-05-15 11:56:57 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2014-05-29 11:11:50 -0400 |
| commit | 68072992c8f6ace57fe80b6fb5d57b3ae887a09d (patch) | |
| tree | 2d6ee1de5a0a7cb61a1d9b171c8b05e83b8653e3 /fs/nfs/read.c | |
| parent | c6194271f94b81042bbc45034d31f9b0920f3905 (diff) | |
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>
Diffstat (limited to 'fs/nfs/read.c')
| -rw-r--r-- | fs/nfs/read.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 53d5b83611ce..e818a475ca64 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -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)) { |