On Thu, 17 Oct 2024, Chuck Lever wrote: > On Tue, Oct 15, 2024 at 06:29:31PM -0600, Gustavo A. R. Silva wrote: > > -Wflex-array-member-not-at-end was introduced in GCC-14, and we are > > getting ready to enable it, globally. > > > > Address the following warnings by changing the type of the middle struct > > members in `struct nfsd_genl_rqstp`, which are currently causing trouble, > > from `struct sockaddr` to `struct sockaddr_legacy`. Note that the latter > > struct doesn't contain a flexible-array member. > > > > fs/nfsd/nfsd.h:74:33: warning: structure containing a flexible array member > > is not at the end of another structure [-Wflex-array-member-not-at-end] > > fs/nfsd/nfsd.h:75:33: warning: structure containing a flexible array member > > is not at the end of another structure [-Wflex-array-member-not-at-end] > > > > Also, update some related code, accordingly. > > > > No binary differences are present after these changes. > > > > Signed-off-by: Gustavo A. R. Silva <[email protected]> > > --- > > fs/nfsd/nfsctl.c | 4 ++-- > > fs/nfsd/nfsd.h | 4 ++-- > > 2 files changed, 4 insertions(+), 4 deletions(-) > > > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > > index 3adbc05ebaac..884bfdc7a255 100644 > > --- a/fs/nfsd/nfsctl.c > > +++ b/fs/nfsd/nfsctl.c > > @@ -1599,9 +1599,9 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, > > genl_rqstp.rq_stime = rqstp->rq_stime; > > genl_rqstp.rq_opcnt = 0; > > memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp), > > - sizeof(struct sockaddr)); > > + sizeof(struct sockaddr_legacy)); > > memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp), > > - sizeof(struct sockaddr)); > > + sizeof(struct sockaddr_legacy)); > > > > #ifdef CONFIG_NFSD_V4 > > if (rqstp->rq_vers == NFS4_VERSION && > > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h > > index 004415651295..44be32510595 100644 > > --- a/fs/nfsd/nfsd.h > > +++ b/fs/nfsd/nfsd.h > > @@ -71,8 +71,8 @@ struct readdir_cd { > > #define NFSD_MAX_OPS_PER_COMPOUND 50 > > > > struct nfsd_genl_rqstp { > > - struct sockaddr rq_daddr; > > - struct sockaddr rq_saddr; > > + struct sockaddr_legacy rq_daddr; > > + struct sockaddr_legacy rq_saddr; > > I was hoping to find a struct definition that was simply a union of > sockaddr_in and sockaddr_in6, which we have in nfs-utils but I guess > not here in the kernel. > > Can we use "struct sockaddr_storage" safely here? Then above, > replace the raw memcpy() with rpc_copy_addr() ?
sockaddr_storage is conceptually the right solution. It is 128 bytes so 2 of them will waste about 200 bytes on the stack. Does that matter these days? Probably not. I do like using rpc_copy_addr(). NeilBrown > > > > unsigned long rq_flags; > > ktime_t rq_stime; > > __be32 rq_xid; > > -- > > 2.34.1 > > > > -- > Chuck Lever >
