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Commit f4340e93 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend() 



If the attempt to resend the pages fails, we need to ensure that we
clean up those pages that were not transmitted.

Fixes: d600ad1f ("NFS41: pop some layoutget errors to application")
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.5+
parent 9821421a

fs/nfs/pagelist.c

+9 −7
Original line number Diff line number Diff line
@@ -1251,20 +1251,22 @@ static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc, 
int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,

		      struct nfs_pgio_header *hdr)

{

	LIST_HEAD(failed);

	LIST_HEAD(pages);



	desc->pg_io_completion = hdr->io_completion;

	desc->pg_dreq = hdr->dreq;

	while (!list_empty(&hdr->pages)) {

		struct nfs_page *req = nfs_list_entry(hdr->pages.next);

	list_splice_init(&hdr->pages, &pages);

	while (!list_empty(&pages)) {

		struct nfs_page *req = nfs_list_entry(pages.next);



		if (!nfs_pageio_add_request(desc, req))

			nfs_list_move_request(req, &failed);

			break;

	}

	nfs_pageio_complete(desc);

	if (!list_empty(&failed)) {

		list_move(&failed, &hdr->pages);

		return desc->pg_error < 0 ? desc->pg_error : -EIO;

	if (!list_empty(&pages)) {

		int err = desc->pg_error < 0 ? desc->pg_error : -EIO;

		hdr->completion_ops->error_cleanup(&pages, err);

		return err;

	}

	return 0;

}