git: 37a1501ed3dc - stable/13 - nfscl: Fix NFS VOP_ALLOCATE for mounts without Allocate support

The branch stable/13 has been updated by rmacklem:

URL: https://cgit.FreeBSD.org/src/commit/?id=37a1501ed3dc05b875e6cb5ba0cf9a163ed4f622

commit 37a1501ed3dc05b875e6cb5ba0cf9a163ed4f622
Author:     Rick Macklem <rmacklem@FreeBSD.org>
AuthorDate: 2021-10-10 21:27:52 +0000
Commit:     Rick Macklem <rmacklem@FreeBSD.org>
CommitDate: 2021-10-25 21:28:47 +0000

    nfscl: Fix NFS VOP_ALLOCATE for mounts without Allocate support
    
    Without this patch, nfs_allocate() fell back on using vop_stdallocate()
    for NFS mounts without Allocate operation support.  This was incorrect,
    since some file systems, such as ZFS, cannot do allocate via
    vop_stdallocate(), which uses writes to try and allocate blocks.
    
    Also, fix nfs_allocate() to return EINVAL when mounts cannot do Allocate,
    since that is the correct error for posix_fallocate(2).
    Note that Allocate is only supported by some NFSv4.2 servers.
    
    (cherry picked from commit 235891a1273d99b86784f935d2d6c554ce189559)
---
 sys/fs/nfsclient/nfs_clvnops.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/sys/fs/nfsclient/nfs_clvnops.c b/sys/fs/nfsclient/nfs_clvnops.c
index 29b0cdce4bbc..8da0186c3c62 100644
--- a/sys/fs/nfsclient/nfs_clvnops.c
+++ b/sys/fs/nfsclient/nfs_clvnops.c
@@ -3649,17 +3649,12 @@ nfs_allocate(struct vop_allocate_args *ap)
 			mtx_lock(&nmp->nm_mtx);
 			nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
 			mtx_unlock(&nmp->nm_mtx);
+			error = EINVAL;
 		}
 	} else {
 		mtx_unlock(&nmp->nm_mtx);
-		error = EIO;
+		error = EINVAL;
 	}
-	/*
-	 * If the NFS server cannot perform the Allocate operation, just call
-	 * vop_stdallocate() to perform it.
-	 */
-	if (error != 0)
-		error = vop_stdallocate(ap);
 	if (attrflag != 0) {
 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
 		if (error == 0 && ret != 0)