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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: d600ad1f2b ("NFS41: pop some layoutget errors to application")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.5+
This commit is contained in:
Trond Myklebust 2019-08-12 15:19:54 -04:00
parent 9821421a29
commit f4340e9314
1 changed files with 9 additions and 7 deletions
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16
fs/nfs/pagelist.c
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@ -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;
}