git: 968a4d11b881 - stable/13 - nfsv4.1/4.2 client: fix handling of delegations for "oneopenown" mnt option

[Rick Macklem]

The branch stable/13 has been updated by rmacklem:

URL: https://cgit.FreeBSD.org/src/commit/?id=968a4d11b881bba34f1a090f7e46f7e844f6ad3f

commit 968a4d11b881bba34f1a090f7e46f7e844f6ad3f
Author:     Rick Macklem <rmacklem at FreeBSD.org>
AuthorDate: 2021-03-29 19:09:19 +0000
Commit:     Rick Macklem <rmacklem at FreeBSD.org>
CommitDate: 2021-04-12 01:27:15 +0000

    nfsv4.1/4.2 client: fix handling of delegations for "oneopenown" mnt option
    
    If a delegation for a file has been acquired, the "oneopenown" option
    was ignored when the local open was issued. This could result in multiple
    openowners/opens for a file, that would be transferred to the server
    when the delegation was recalled.
    This would not be serious, but could result in more than one openowner.
    Since the Amazon/EFS does not issue delegations, this probably never
    occurs in practice.
    Spotted during code inspection.
    
    This small patch fixes the code so that it checks for "oneopenown"
    when doing client local opens on a delegation.
    
    (cherry picked from commit e61b29ab5d2d9afd41d9fa06bb1f4cad4e9d0650)
---
 sys/fs/nfsclient/nfs_clstate.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/sys/fs/nfsclient/nfs_clstate.c b/sys/fs/nfsclient/nfs_clstate.c
index 4e3abf82c96a..1e4625191bfe 100644
--- a/sys/fs/nfsclient/nfs_clstate.c
+++ b/sys/fs/nfsclient/nfs_clstate.c
@@ -267,17 +267,15 @@ nfscl_open(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t amode, int usedeleg,
 		}
 	}
 
-	if (dp != NULL) {
+	/* For NFSv4.1/4.2 and this option, use a single open_owner. */
+	if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount)))
+		nfscl_filllockowner(NULL, own, F_POSIX);
+	else
 		nfscl_filllockowner(p->td_proc, own, F_POSIX);
+	if (dp != NULL)
 		ohp = &dp->nfsdl_owner;
-	} else {
-		/* For NFSv4.1 and this option, use a single open_owner. */
-		if (NFSHASONEOPENOWN(VFSTONFS(vp->v_mount)))
-			nfscl_filllockowner(NULL, own, F_POSIX);
-		else
-			nfscl_filllockowner(p->td_proc, own, F_POSIX);
+	else
 		ohp = &clp->nfsc_owner;
-	}
 	/* Now, search for an openowner */
 	LIST_FOREACH(owp, ohp, nfsow_list) {
 		if (!NFSBCMP(owp->nfsow_owner, own, NFSV4CL_LOCKNAMELEN))