On Sat, 03 Aug 2024, Mike Snitzer wrote:
> On Mon, Jul 15, 2024 at 05:14:17PM +1000, NeilBrown wrote:
> > Instead of using kmalloc to allocate an array for storing active version
> > info, just declare and array to the max size - it is only 5 or so.
> >
> > Signed-off-by: NeilBrown <neilb@xxxxxxx>
> > ---
> > fs/nfs/nfs4state.c | 2 +
> > fs/nfsd/cache.h | 2 +-
> > fs/nfsd/netns.h | 6 +--
> > fs/nfsd/nfsctl.c | 10 +++--
> > fs/nfsd/nfsd.h | 9 +++-
> > fs/nfsd/nfssvc.c | 100 ++++++++-------------------------------------
> > 6 files changed, 36 insertions(+), 93 deletions(-)
> >
> > diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> > index 5b452411e8fd..68c663626480 100644
> > --- a/fs/nfs/nfs4state.c
> > +++ b/fs/nfs/nfs4state.c
> > @@ -1953,6 +1953,8 @@ static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recov
> > if (lost_locks)
> > pr_warn("NFS: %s: lost %d locks\n",
> > clp->cl_hostname, lost_locks);
> > + nfs4_free_state_owners(&freeme);
> > +
> > set_bit(ops->owner_flag_bit, &sp->so_flags);
> > nfs4_put_state_owner(sp);
> > status = nfs4_recovery_handle_error(clp, status);
>
> Hey Neil,
>
> This call to nfs4_free_state_owners() feels out of place given the
> rest of this patch. Was it meant to be folded into a different
> patch?
I think I was writing a different patch (there is a case where the
lost-locks warning can be incorrect) and I got half way and stopped for
some reason. Then later I wanted to do this patch and did "git stash"
but I hadn't saved all my work. So when I later did a "save all
buffers" that change went into the wrong patch.
I'll follow up on Monday - thanks for noticing and letting me know!
NeilBrown
>
> Thanks,
> Mike
>
>
> > diff --git a/fs/nfsd/cache.h b/fs/nfsd/cache.h
> > index 66a05fefae98..bb7addef4a31 100644
> > --- a/fs/nfsd/cache.h
> > +++ b/fs/nfsd/cache.h
> > @@ -10,7 +10,7 @@
> > #define NFSCACHE_H
> >
> > #include <linux/sunrpc/svc.h>
> > -#include "netns.h"
> > +#include "nfsd.h"
> >
> > /*
> > * Representation of a reply cache entry.
> > diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
> > index 14ec15656320..238fc4e56e53 100644
> > --- a/fs/nfsd/netns.h
> > +++ b/fs/nfsd/netns.h
> > @@ -152,8 +152,8 @@ struct nfsd_net {
> > /*
> > * Version information
> > */
> > - bool *nfsd_versions;
> > - bool *nfsd4_minorversions;
> > + bool nfsd_versions[NFSD_MAXVERS + 1];
> > + bool nfsd4_minorversions[NFSD_SUPPORTED_MINOR_VERSION + 1];
> >
> > /*
> > * Duplicate reply cache
> > @@ -219,8 +219,6 @@ struct nfsd_net {
> > #define nfsd_netns_ready(nn) ((nn)->sessionid_hashtbl)
> >
> > extern bool nfsd_support_version(int vers);
> > -extern void nfsd_netns_free_versions(struct nfsd_net *nn);
> > -
> > extern unsigned int nfsd_net_id;
> >
> > void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
> > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > index 9b47723fc110..5b0f2e0d7ccf 100644
> > --- a/fs/nfsd/nfsctl.c
> > +++ b/fs/nfsd/nfsctl.c
> > @@ -2232,8 +2232,9 @@ int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info)
> > */
> > static __net_init int nfsd_net_init(struct net *net)
> > {
> > - int retval;
> > struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> > + int retval;
> > + int i;
> >
> > retval = nfsd_export_init(net);
> > if (retval)
> > @@ -2247,8 +2248,10 @@ static __net_init int nfsd_net_init(struct net *net)
> > goto out_repcache_error;
> > memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats));
> > nn->nfsd_svcstats.program = &nfsd_program;
> > - nn->nfsd_versions = NULL;
> > - nn->nfsd4_minorversions = NULL;
> > + for (i = 0; i < sizeof(nn->nfsd_versions); i++)
> > + nn->nfsd_versions[i] = nfsd_support_version(i);
> > + for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++)
> > + nn->nfsd4_minorversions[i] = nfsd_support_version(4);
> > nn->nfsd_info.mutex = &nfsd_mutex;
> > nn->nfsd_serv = NULL;
> > nfsd4_init_leases_net(nn);
> > @@ -2279,7 +2282,6 @@ static __net_exit void nfsd_net_exit(struct net *net)
> > percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM);
> > nfsd_idmap_shutdown(net);
> > nfsd_export_shutdown(net);
> > - nfsd_netns_free_versions(nn);
> > }
> >
> > static struct pernet_operations nfsd_net_ops = {
> > diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> > index 39e109a7d56d..369c3b3ce53e 100644
> > --- a/fs/nfsd/nfsd.h
> > +++ b/fs/nfsd/nfsd.h
> > @@ -23,9 +23,7 @@
> >
> > #include <uapi/linux/nfsd/debug.h>
> >
> > -#include "netns.h"
> > #include "export.h"
> > -#include "stats.h"
> >
> > #undef ifdebug
> > #ifdef CONFIG_SUNRPC_DEBUG
> > @@ -37,7 +35,14 @@
> > /*
> > * nfsd version
> > */
> > +#define NFSD_MINVERS 2
> > +#define NFSD_MAXVERS 4
> > #define NFSD_SUPPORTED_MINOR_VERSION 2
> > +bool nfsd_support_version(int vers);
> > +
> > +#include "netns.h"
> > +#include "stats.h"
> > +
> > /*
> > * Maximum blocksizes supported by daemon under various circumstances.
> > */
> > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
> > index f25b26bc5670..4438cdcd4873 100644
> > --- a/fs/nfsd/nfssvc.c
> > +++ b/fs/nfsd/nfssvc.c
> > @@ -116,15 +116,12 @@ static const struct svc_version *nfsd_version[] = {
> > #endif
> > };
> >
> > -#define NFSD_MINVERS 2
> > -#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
> > -
> > struct svc_program nfsd_program = {
> > #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
> > .pg_next = &nfsd_acl_program,
> > #endif
> > .pg_prog = NFS_PROGRAM, /* program number */
> > - .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
> > + .pg_nvers = NFSD_MAXVERS+1, /* nr of entries in nfsd_version */
> > .pg_vers = nfsd_version, /* version table */
> > .pg_name = "nfsd", /* program name */
> > .pg_class = "nfsd", /* authentication class */
> > @@ -135,78 +132,24 @@ struct svc_program nfsd_program = {
> >
> > bool nfsd_support_version(int vers)
> > {
> > - if (vers >= NFSD_MINVERS && vers < NFSD_NRVERS)
> > + if (vers >= NFSD_MINVERS && vers <= NFSD_MAXVERS)
> > return nfsd_version[vers] != NULL;
> > return false;
> > }
> >
> > -static bool *
> > -nfsd_alloc_versions(void)
> > -{
> > - bool *vers = kmalloc_array(NFSD_NRVERS, sizeof(bool), GFP_KERNEL);
> > - unsigned i;
> > -
> > - if (vers) {
> > - /* All compiled versions are enabled by default */
> > - for (i = 0; i < NFSD_NRVERS; i++)
> > - vers[i] = nfsd_support_version(i);
> > - }
> > - return vers;
> > -}
> > -
> > -static bool *
> > -nfsd_alloc_minorversions(void)
> > -{
> > - bool *vers = kmalloc_array(NFSD_SUPPORTED_MINOR_VERSION + 1,
> > - sizeof(bool), GFP_KERNEL);
> > - unsigned i;
> > -
> > - if (vers) {
> > - /* All minor versions are enabled by default */
> > - for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++)
> > - vers[i] = nfsd_support_version(4);
> > - }
> > - return vers;
> > -}
> > -
> > -void
> > -nfsd_netns_free_versions(struct nfsd_net *nn)
> > -{
> > - kfree(nn->nfsd_versions);
> > - kfree(nn->nfsd4_minorversions);
> > - nn->nfsd_versions = NULL;
> > - nn->nfsd4_minorversions = NULL;
> > -}
> > -
> > -static void
> > -nfsd_netns_init_versions(struct nfsd_net *nn)
> > -{
> > - if (!nn->nfsd_versions) {
> > - nn->nfsd_versions = nfsd_alloc_versions();
> > - nn->nfsd4_minorversions = nfsd_alloc_minorversions();
> > - if (!nn->nfsd_versions || !nn->nfsd4_minorversions)
> > - nfsd_netns_free_versions(nn);
> > - }
> > -}
> > -
> > int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change)
> > {
> > - if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
> > + if (vers < NFSD_MINVERS || vers > NFSD_MAXVERS)
> > return 0;
> > switch(change) {
> > case NFSD_SET:
> > - if (nn->nfsd_versions)
> > - nn->nfsd_versions[vers] = nfsd_support_version(vers);
> > + nn->nfsd_versions[vers] = nfsd_support_version(vers);
> > break;
> > case NFSD_CLEAR:
> > - nfsd_netns_init_versions(nn);
> > - if (nn->nfsd_versions)
> > - nn->nfsd_versions[vers] = false;
> > + nn->nfsd_versions[vers] = false;
> > break;
> > case NFSD_TEST:
> > - if (nn->nfsd_versions)
> > - return nn->nfsd_versions[vers];
> > - fallthrough;
> > + return nn->nfsd_versions[vers];
> > case NFSD_AVAIL:
> > return nfsd_support_version(vers);
> > }
> > @@ -233,23 +176,16 @@ int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change
> >
> > switch(change) {
> > case NFSD_SET:
> > - if (nn->nfsd4_minorversions) {
> > - nfsd_vers(nn, 4, NFSD_SET);
> > - nn->nfsd4_minorversions[minorversion] =
> > - nfsd_vers(nn, 4, NFSD_TEST);
> > - }
> > + nfsd_vers(nn, 4, NFSD_SET);
> > + nn->nfsd4_minorversions[minorversion] =
> > + nfsd_vers(nn, 4, NFSD_TEST);
> > break;
> > case NFSD_CLEAR:
> > - nfsd_netns_init_versions(nn);
> > - if (nn->nfsd4_minorversions) {
> > - nn->nfsd4_minorversions[minorversion] = false;
> > - nfsd_adjust_nfsd_versions4(nn);
> > - }
> > + nn->nfsd4_minorversions[minorversion] = false;
> > + nfsd_adjust_nfsd_versions4(nn);
> > break;
> > case NFSD_TEST:
> > - if (nn->nfsd4_minorversions)
> > - return nn->nfsd4_minorversions[minorversion];
> > - return nfsd_vers(nn, 4, NFSD_TEST);
> > + return nn->nfsd4_minorversions[minorversion];
> > case NFSD_AVAIL:
> > return minorversion <= NFSD_SUPPORTED_MINOR_VERSION &&
> > nfsd_vers(nn, 4, NFSD_AVAIL);
> > @@ -568,11 +504,11 @@ void nfsd_reset_versions(struct nfsd_net *nn)
> > {
> > int i;
> >
> > - for (i = 0; i < NFSD_NRVERS; i++)
> > + for (i = 0; i <= NFSD_MAXVERS; i++)
> > if (nfsd_vers(nn, i, NFSD_TEST))
> > return;
> >
> > - for (i = 0; i < NFSD_NRVERS; i++)
> > + for (i = 0; i <= NFSD_MAXVERS; i++)
> > if (i != 4)
> > nfsd_vers(nn, i, NFSD_SET);
> > else {
> > @@ -905,17 +841,17 @@ nfsd_init_request(struct svc_rqst *rqstp,
> > if (likely(nfsd_vers(nn, rqstp->rq_vers, NFSD_TEST)))
> > return svc_generic_init_request(rqstp, progp, ret);
> >
> > - ret->mismatch.lovers = NFSD_NRVERS;
> > - for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
> > + ret->mismatch.lovers = NFSD_MAXVERS + 1;
> > + for (i = NFSD_MINVERS; i <= NFSD_MAXVERS; i++) {
> > if (nfsd_vers(nn, i, NFSD_TEST)) {
> > ret->mismatch.lovers = i;
> > break;
> > }
> > }
> > - if (ret->mismatch.lovers == NFSD_NRVERS)
> > + if (ret->mismatch.lovers > NFSD_MAXVERS)
> > return rpc_prog_unavail;
> > ret->mismatch.hivers = NFSD_MINVERS;
> > - for (i = NFSD_NRVERS - 1; i >= NFSD_MINVERS; i--) {
> > + for (i = NFSD_MAXVERS; i >= NFSD_MINVERS; i--) {
> > if (nfsd_vers(nn, i, NFSD_TEST)) {
> > ret->mismatch.hivers = i;
> > break;
> > --
> > 2.44.0
> >
> >
>
