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NFS: Fix a potential data corruption

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We must ensure that the subrequests are joined back into the head before
we can retransmit a request. If the head was not on the commit lists,
because the server wrote it synchronously, we still need to add it back
to the retransmission list.
Add a call that mirrors the effect of nfs_cancel_remove_inode() for
O_DIRECT.

Fixes: ed5d588fe4 ("NFS: Try to join page groups before an O_DIRECT retransmission")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2023-08-19 17:22:14 -04:00 committed by Anna Schumaker
parent 14e7316a3c
commit 88975a5596
1 changed files with 19 additions and 1 deletions
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20
fs/nfs/direct.c
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@ -472,13 +472,31 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter,
return result;
}
static void nfs_direct_add_page_head(struct list_head *list,
struct nfs_page *req)
{
struct nfs_page *head = req->wb_head;
if (!list_empty(&head->wb_list) || !nfs_lock_request(head))
return;
if (!list_empty(&head->wb_list)) {
nfs_unlock_request(head);
return;
}
list_add(&head->wb_list, list);
kref_get(&head->wb_kref);
kref_get(&head->wb_kref);
}
static void nfs_direct_join_group(struct list_head *list, struct inode *inode)
{
struct nfs_page *req, *subreq;
list_for_each_entry(req, list, wb_list) {
if (req->wb_head != req)
if (req->wb_head != req) {
nfs_direct_add_page_head(&req->wb_list, req);
continue;
}
subreq = req->wb_this_page;
if (subreq == req)
continue;