NFSv4: Add helpers for basic copying of stateids

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

5 files changed, 38 insertions, 36 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index c7249e26e2e9..87f7544f3dce 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -105,7 +105,7 @@ again:
                         continue;
                 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
                         continue;
-                if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
+                if (!nfs4_stateid_match(&state->stateid, stateid))
                         continue;
                 get_nfs_open_context(ctx);
                 spin_unlock(&inode->i_lock);
@@ -139,8 +139,7 @@ void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
         if (delegation != NULL) {
                 spin_lock(&delegation->lock);
                 if (delegation->inode != NULL) {
-                        memcpy(delegation->stateid.data, res->delegation.data,
-                               sizeof(delegation->stateid.data));
+                        nfs4_stateid_copy(&delegation->stateid, &res->delegation);
                         delegation->type = res->delegation_type;
                         delegation->maxsize = res->maxsize;
                         oldcred = delegation->cred;
@@ -236,8 +235,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
         delegation = kmalloc(sizeof(*delegation), GFP_NOFS);
         if (delegation == NULL)
                 return -ENOMEM;
-        memcpy(delegation->stateid.data, res->delegation.data,
-                        sizeof(delegation->stateid.data));
+        nfs4_stateid_copy(&delegation->stateid, &res->delegation);
         delegation->type = res->delegation_type;
         delegation->maxsize = res->maxsize;
         delegation->change_attr = inode->i_version;
@@ -250,8 +248,8 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
         old_delegation = rcu_dereference_protected(nfsi->delegation,
                                         lockdep_is_held(&clp->cl_lock));
         if (old_delegation != NULL) {
-                if (memcmp(&delegation->stateid, &old_delegation->stateid,
-                                        sizeof(old_delegation->stateid)) == 0 &&
+                if (nfs4_stateid_match(&delegation->stateid,
+                                        &old_delegation->stateid) &&
                                 delegation->type == old_delegation->type) {
                         goto out;
                 }
@@ -708,7 +706,7 @@ int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
         rcu_read_lock();
         delegation = rcu_dereference(nfsi->delegation);
         if (delegation != NULL) {
-                memcpy(dst->data, delegation->stateid.data, sizeof(dst->data));
+                nfs4_stateid_copy(dst, &delegation->stateid);
                 ret = 1;
         }
         rcu_read_unlock();
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 308d2f999c3d..1c54ef3146d4 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -349,6 +349,16 @@ struct nfs4_mount_data;
 extern struct svc_version nfs4_callback_version1;
 extern struct svc_version nfs4_callback_version4;
 
+static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
+{
+        memcpy(dst->data, src->data, sizeof(dst->data));
+}
+
+static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
+{
+        return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
+}
+
 #else
 
 #define nfs4_close_state(a, b) do { } while (0)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f181c70ea933..ce0ad81dd466 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -941,8 +941,8 @@ static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 {
         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
-                memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
-        memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
+                nfs4_stateid_copy(&state->stateid, stateid);
+        nfs4_stateid_copy(&state->open_stateid, stateid);
         switch (fmode) {
                 case FMODE_READ:
                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
@@ -970,7 +970,7 @@ static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_s
          */
         write_seqlock(&state->seqlock);
         if (deleg_stateid != NULL) {
-                memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
+                nfs4_stateid_copy(&state->stateid, deleg_stateid);
                 set_bit(NFS_DELEGATED_STATE, &state->flags);
         }
         if (open_stateid != NULL)
@@ -1001,7 +1001,7 @@ static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stat
 
         if (delegation == NULL)
                 delegation = &deleg_cur->stateid;
-        else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
+        else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
                 goto no_delegation_unlock;
 
         nfs_mark_delegation_referenced(deleg_cur);
@@ -1062,7 +1062,7 @@ static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
                         break;
                 }
                 /* Save the delegation */
-                memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
+                nfs4_stateid_copy(&stateid, &delegation->stateid);
                 rcu_read_unlock();
                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
                 if (ret != 0)
@@ -1225,10 +1225,10 @@ static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *
          * Check if we need to update the current stateid.
          */
         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
-            memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
+            !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
                 write_seqlock(&state->seqlock);
                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
-                        memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
+                        nfs4_stateid_copy(&state->stateid, &state->open_stateid);
                 write_sequnlock(&state->seqlock);
         }
         return 0;
@@ -1297,8 +1297,7 @@ static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs
         if (IS_ERR(opendata))
                 return PTR_ERR(opendata);
         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
-        memcpy(opendata->o_arg.u.delegation.data, stateid->data,
-                        sizeof(opendata->o_arg.u.delegation.data));
+        nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
         ret = nfs4_open_recover(opendata, state);
         nfs4_opendata_put(opendata);
         return ret;
@@ -1363,8 +1362,7 @@ static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 
         data->rpc_status = task->tk_status;
         if (data->rpc_status == 0) {
-                memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
-                                sizeof(data->o_res.stateid.data));
+                nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
                 renew_lease(data->o_res.server, data->timestamp);
                 data->rpc_done = 1;
@@ -1924,7 +1922,7 @@ static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
         } else if (state != NULL) {
                 nfs4_select_rw_stateid(&arg.stateid, state, current->files, current->tgid);
         } else
-                memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
+                nfs4_stateid_copy(&arg.stateid, &zero_stateid);
 
         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
         if (status == 0 && state != NULL)
@@ -3989,7 +3987,7 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
         data->args.stateid = &data->stateid;
         data->args.bitmask = server->attr_bitmask;
         nfs_copy_fh(&data->fh, NFS_FH(inode));
-        memcpy(&data->stateid, stateid, sizeof(data->stateid));
+        nfs4_stateid_copy(&data->stateid, stateid);
         data->res.fattr = &data->fattr;
         data->res.server = server;
         nfs_fattr_init(data->res.fattr);
@@ -4172,9 +4170,8 @@ static void nfs4_locku_done(struct rpc_task *task, void *data)
                 return;
         switch (task->tk_status) {
                 case 0:
-                        memcpy(calldata->lsp->ls_stateid.data,
-                                        calldata->res.stateid.data,
-                                        sizeof(calldata->lsp->ls_stateid.data));
+                        nfs4_stateid_copy(&calldata->lsp->ls_stateid,
+                                        &calldata->res.stateid);
                         renew_lease(calldata->server, calldata->timestamp);
                         break;
                 case -NFS4ERR_BAD_STATEID:
@@ -4387,8 +4384,7 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
                         goto out;
         }
         if (data->rpc_status == 0) {
-                memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
-                                        sizeof(data->lsp->ls_stateid.data));
+                nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
         }
@@ -6292,7 +6288,7 @@ static bool nfs41_match_stateid(const nfs4_stateid *s1,
 static bool nfs4_match_stateid(const nfs4_stateid *s1,
                 const nfs4_stateid *s2)
 {
-        return memcmp(s1->data, s2->data, sizeof(s1->data)) == 0;
+        return nfs4_stateid_match(s1, s2);
 }
 
 
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 6ba82271c868..55c8a81cd6fb 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -895,7 +895,7 @@ void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owne
 
         do {
                 seq = read_seqbegin(&state->seqlock);
-                memcpy(dst, &state->stateid, sizeof(*dst));
+                nfs4_stateid_copy(dst, &state->stateid);
         } while (read_seqretry(&state->seqlock, seq));
         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
                 return;
@@ -903,7 +903,7 @@ void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owne
         spin_lock(&state->state_lock);
         lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
-                memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
+                nfs4_stateid_copy(dst, &lsp->ls_stateid);
         spin_unlock(&state->state_lock);
         nfs4_put_lock_state(lsp);
 }
@@ -1126,7 +1126,7 @@ void nfs_inode_find_state_and_recover(struct inode *inode,
                         continue;
                 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
                         continue;
-                if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
+                if (!nfs4_stateid_match(&state->stateid, stateid))
                         continue;
                 nfs4_state_mark_reclaim_nograce(clp, state);
                 found = true;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 402efc2f5b70..c190e9c2e3d2 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -499,7 +499,7 @@ pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
         oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
         newseq = be32_to_cpu(new->stateid.seqid);
         if ((int)(newseq - oldseq) > 0) {
-                memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
+                nfs4_stateid_copy(&lo->plh_stateid, new);
                 if (update_barrier) {
                         u32 new_barrier = be32_to_cpu(new->stateid.seqid);
 
@@ -549,11 +549,10 @@ pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
 
                 do {
                         seq = read_seqbegin(&open_state->seqlock);
-                        memcpy(dst->data, open_state->stateid.data,
-                               sizeof(open_state->stateid.data));
+                        nfs4_stateid_copy(dst, &open_state->stateid);
                 } while (read_seqretry(&open_state->seqlock, seq));
         } else
-                memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
+                nfs4_stateid_copy(dst, &lo->plh_stateid);
         spin_unlock(&lo->plh_inode->i_lock);
         dprintk("<-- %s\n", __func__);
         return status;
@@ -1527,8 +1526,7 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
         end_pos = nfsi->layout->plh_lwb;
         nfsi->layout->plh_lwb = 0;
 
-        memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
-                sizeof(nfsi->layout->plh_stateid.data));
+        nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
         spin_unlock(&inode->i_lock);
 
         data->args.inode = inode;