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NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT

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Fix an Oopsable condition in pnfs_mark_request_commit() when we're
putting a set of writes on the commit list to reschedule them after a
failed pNFS attempt.

Fixes: 9c455a8c1e14 ("NFS/pNFS: Clean up pNFS commit operations")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-06-11 13:40:55 -04:00
parent dd99e9f98f
commit 3731d44bba
1 changed files with 7 additions and 10 deletions
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17
fs/nfs/direct.c
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@ -700,8 +700,8 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
{
struct nfs_direct_req *dreq = hdr->dreq;
struct nfs_commit_info cinfo;
bool request_commit = false;
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
int flags = NFS_ODIRECT_DONE;
nfs_init_cinfo_from_dreq(&cinfo, dreq);
@ -713,15 +713,9 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
nfs_direct_count_bytes(dreq, hdr);
if (hdr->good_bytes != 0 && nfs_write_need_commit(hdr)) {
switch (dreq->flags) {
case 0:
if (!dreq->flags)
dreq->flags = NFS_ODIRECT_DO_COMMIT;
request_commit = true;
break;
case NFS_ODIRECT_RESCHED_WRITES:
case NFS_ODIRECT_DO_COMMIT:
request_commit = true;
}
flags = dreq->flags;
}
spin_unlock(&dreq->lock);
@ -729,12 +723,15 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
req = nfs_list_entry(hdr->pages.next);
nfs_list_remove_request(req);
if (request_commit) {
if (flags == NFS_ODIRECT_DO_COMMIT) {
kref_get(&req->wb_kref);
memcpy(&req->wb_verf, &hdr->verf.verifier,
sizeof(req->wb_verf));
nfs_mark_request_commit(req, hdr->lseg, &cinfo,
hdr->ds_commit_idx);
} else if (flags == NFS_ODIRECT_RESCHED_WRITES) {
kref_get(&req->wb_kref);
nfs_mark_request_commit(req, NULL, &cinfo, 0);
}
nfs_unlock_and_release_request(req);
}