17 files changed, 340 insertions, 170 deletions

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 9c94297bb70e..7f6a23f0244e 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -38,6 +38,8 @@
 #include <linux/buffer_head.h>  /* various write calls */
 #include <linux/prefetch.h>
 
+#include "../pnfs.h"
+#include "../internal.h"
 #include "blocklayout.h"
 
 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
@@ -868,7 +870,7 @@ nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
          * GETDEVICEINFO's maxcount
          */
         max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
-        max_pages = max_resp_sz >> PAGE_SHIFT;
+        max_pages = nfs_page_array_len(0, max_resp_sz);
         dprintk("%s max_resp_sz %u max_pages %d\n",
                 __func__, max_resp_sz, max_pages);
 
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index da7b5e4ff9ec..60f7e4ec842c 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1729,7 +1729,8 @@ error:
  */
 struct nfs_server *nfs_clone_server(struct nfs_server *source,
                                     struct nfs_fh *fh,
-                                    struct nfs_fattr *fattr)
+                                    struct nfs_fattr *fattr,
+                                    rpc_authflavor_t flavor)
 {
         struct nfs_server *server;
         struct nfs_fattr *fattr_fsinfo;
@@ -1758,7 +1759,7 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
 
         error = nfs_init_server_rpcclient(server,
                         source->client->cl_timeout,
-                        source->client->cl_auth->au_flavor);
+                        flavor);
         if (error < 0)
                 goto out_free_server;
         if (!IS_ERR(source->client_acl))
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 4aaf0316d76a..8789210c6905 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1429,7 +1429,7 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry
         }
 
         open_flags = nd->intent.open.flags;
-        attr.ia_valid = 0;
+        attr.ia_valid = ATTR_OPEN;
 
         ctx = create_nfs_open_context(dentry, open_flags);
         res = ERR_CAST(ctx);
@@ -1536,7 +1536,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
         if (IS_ERR(ctx))
                 goto out;
 
-        attr.ia_valid = 0;
+        attr.ia_valid = ATTR_OPEN;
         if (openflags & O_TRUNC) {
                 attr.ia_valid |= ATTR_SIZE;
                 attr.ia_size = 0;
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index b7f348bb618b..ba3019f5934c 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -554,12 +554,16 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
         struct nfs_client *clp;
         int error = 0;
 
+        if (!try_module_get(THIS_MODULE))
+                return 0;
+
         while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
                 error = __rpc_pipefs_event(clp, event, sb);
                 nfs_put_client(clp);
                 if (error)
                         break;
         }
+        module_put(THIS_MODULE);
         return error;
 }
 
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 2476dc69365f..b777bdaba4c5 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -165,7 +165,8 @@ extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 extern void nfs_free_server(struct nfs_server *server);
 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
                                            struct nfs_fh *,
-                                           struct nfs_fattr *);
+                                           struct nfs_fattr *,
+                                           rpc_authflavor_t);
 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 extern int nfs4_check_client_ready(struct nfs_client *clp);
 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
@@ -186,10 +187,10 @@ static inline void nfs_fs_proc_exit(void)
 
 /* nfs4namespace.c */
 #ifdef CONFIG_NFS_V4
-extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
+extern struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry);
 #else
 static inline
-struct vfsmount *nfs_do_refmount(struct dentry *dentry)
+struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry)
 {
         return ERR_PTR(-ENOENT);
 }
@@ -234,7 +235,6 @@ extern const u32 nfs41_maxwrite_overhead;
 /* nfs4proc.c */
 #ifdef CONFIG_NFS_V4
 extern struct rpc_procinfo nfs4_procedures[];
-void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
 #endif
 
 extern int nfs4_init_ds_session(struct nfs_client *clp);
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 1807866bb3ab..d51868e5683c 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -148,66 +148,31 @@ rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *flavors)
         return pseudoflavor;
 }
 
-static int nfs_negotiate_security(const struct dentry *parent,
-                                  const struct dentry *dentry,
-                                  rpc_authflavor_t *flavor)
+static struct rpc_clnt *nfs_lookup_mountpoint(struct inode *dir,
+                                              struct qstr *name,
+                                              struct nfs_fh *fh,
+                                              struct nfs_fattr *fattr)
 {
-        struct page *page;
-        struct nfs4_secinfo_flavors *flavors;
-        int (*secinfo)(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
-        int ret = -EPERM;
-
-        secinfo = NFS_PROTO(parent->d_inode)->secinfo;
-        if (secinfo != NULL) {
-                page = alloc_page(GFP_KERNEL);
-                if (!page) {
-                        ret = -ENOMEM;
-                        goto out;
-                }
-                flavors = page_address(page);
-                ret = secinfo(parent->d_inode, &dentry->d_name, flavors);
-                *flavor = nfs_find_best_sec(flavors);
-                put_page(page);
-        }
-
-out:
-        return ret;
-}
-
-static int nfs_lookup_with_sec(struct nfs_server *server, struct dentry *parent,
-                               struct dentry *dentry, struct path *path,
-                               struct nfs_fh *fh, struct nfs_fattr *fattr,
-                               rpc_authflavor_t *flavor)
-{
-        struct rpc_clnt *clone;
-        struct rpc_auth *auth;
         int err;
 
-        err = nfs_negotiate_security(parent, path->dentry, flavor);
-        if (err < 0)
-                goto out;
-        clone  = rpc_clone_client(server->client);
-        auth   = rpcauth_create(*flavor, clone);
-        if (!auth) {
-                err = -EIO;
-                goto out_shutdown;
-        }
-        err = server->nfs_client->rpc_ops->lookup(clone, parent->d_inode,
-                                                  &path->dentry->d_name,
-                                                  fh, fattr);
-out_shutdown:
-        rpc_shutdown_client(clone);
-out:
-        return err;
+        if (NFS_PROTO(dir)->version == 4)
+                return nfs4_proc_lookup_mountpoint(dir, name, fh, fattr);
+
+        err = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, name, fh, fattr);
+        if (err)
+                return ERR_PTR(err);
+        return rpc_clone_client(NFS_SERVER(dir)->client);
 }
 #else /* CONFIG_NFS_V4 */
-static inline int nfs_lookup_with_sec(struct nfs_server *server,
-                                      struct dentry *parent, struct dentry *dentry,
-                                      struct path *path, struct nfs_fh *fh,
-                                      struct nfs_fattr *fattr,
-                                      rpc_authflavor_t *flavor)
+static inline struct rpc_clnt *nfs_lookup_mountpoint(struct inode *dir,
+                                                     struct qstr *name,
+                                                     struct nfs_fh *fh,
+                                                     struct nfs_fattr *fattr)
 {
-        return -EPERM;
+        int err = NFS_PROTO(dir)->lookup(NFS_SERVER(dir)->client, dir, name, fh, fattr);
+        if (err)
+                return ERR_PTR(err);
+        return rpc_clone_client(NFS_SERVER(dir)->client);
 }
 #endif /* CONFIG_NFS_V4 */
 
@@ -226,12 +191,10 @@ static inline int nfs_lookup_with_sec(struct nfs_server *server,
 struct vfsmount *nfs_d_automount(struct path *path)
 {
         struct vfsmount *mnt;
-        struct nfs_server *server = NFS_SERVER(path->dentry->d_inode);
         struct dentry *parent;
         struct nfs_fh *fh = NULL;
         struct nfs_fattr *fattr = NULL;
-        int err;
-        rpc_authflavor_t flavor = RPC_AUTH_UNIX;
+        struct rpc_clnt *client;
 
         dprintk("--> nfs_d_automount()\n");
 
@@ -249,21 +212,19 @@ struct vfsmount *nfs_d_automount(struct path *path)
 
         /* Look it up again to get its attributes */
         parent = dget_parent(path->dentry);
-        err = server->nfs_client->rpc_ops->lookup(server->client, parent->d_inode,
-                                                  &path->dentry->d_name,
-                                                  fh, fattr);
-        if (err == -EPERM && NFS_PROTO(parent->d_inode)->secinfo != NULL)
-                err = nfs_lookup_with_sec(server, parent, path->dentry, path, fh, fattr, &flavor);
+        client = nfs_lookup_mountpoint(parent->d_inode, &path->dentry->d_name, fh, fattr);
         dput(parent);
-        if (err != 0) {
-                mnt = ERR_PTR(err);
+        if (IS_ERR(client)) {
+                mnt = ERR_CAST(client);
                 goto out;
         }
 
         if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
-                mnt = nfs_do_refmount(path->dentry);
+                mnt = nfs_do_refmount(client, path->dentry);
         else
-                mnt = nfs_do_submount(path->dentry, fh, fattr, flavor);
+                mnt = nfs_do_submount(path->dentry, fh, fattr, client->cl_auth->au_flavor);
+        rpc_shutdown_client(client);
+
         if (IS_ERR(mnt))
                 goto out;
 
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 97ecc863dd76..8d75021020b3 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -59,6 +59,7 @@ struct nfs_unique_id {
 
 #define NFS_SEQID_CONFIRMED 1
 struct nfs_seqid_counter {
+        ktime_t create_time;
         int owner_id;
         int flags;
         u32 counter;
@@ -204,6 +205,9 @@ struct nfs4_state_maintenance_ops {
 extern const struct dentry_operations nfs4_dentry_operations;
 extern const struct inode_operations nfs4_dir_inode_operations;
 
+/* nfs4namespace.c */
+struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *, struct inode *, struct qstr *);
+
 /* nfs4proc.c */
 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
@@ -212,8 +216,11 @@ extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc);
 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
-extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
-                struct nfs4_fs_locations *fs_locations, struct page *page);
+extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
+                                  struct nfs4_fs_locations *, struct page *);
+extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
+                            struct nfs_fh *, struct nfs_fattr *);
+extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 extern int nfs4_release_lockowner(struct nfs4_lock_state *);
 extern const struct xattr_handler *nfs4_xattr_handlers[];
 
diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index a866bbd2890a..c9cff9adb2d3 100644
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -699,7 +699,7 @@ get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_fla
          * GETDEVICEINFO's maxcount
          */
         max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
-        max_pages = max_resp_sz >> PAGE_SHIFT;
+        max_pages = nfs_page_array_len(0, max_resp_sz);
         dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
                 __func__, inode, max_resp_sz, max_pages);
 
diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index 9c8eca315f43..a7f3dedc4ec7 100644
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -52,6 +52,30 @@ Elong:
 }
 
 /*
+ * return the path component of "<server>:<path>"
+ *  nfspath - the "<server>:<path>" string
+ *  end - one past the last char that could contain "<server>:"
+ * returns NULL on failure
+ */
+static char *nfs_path_component(const char *nfspath, const char *end)
+{
+        char *p;
+
+        if (*nfspath == '[') {
+                /* parse [] escaped IPv6 addrs */
+                p = strchr(nfspath, ']');
+                if (p != NULL && ++p < end && *p == ':')
+                        return p + 1;
+        } else {
+                /* otherwise split on first colon */
+                p = strchr(nfspath, ':');
+                if (p != NULL && p < end)
+                        return p + 1;
+        }
+        return NULL;
+}
+
+/*
  * Determine the mount path as a string
  */
 static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
@@ -59,9 +83,9 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen)
         char *limit;
         char *path = nfs_path(&limit, dentry, buffer, buflen);
         if (!IS_ERR(path)) {
-                char *colon = strchr(path, ':');
-                if (colon && colon < limit)
-                        path = colon + 1;
+                char *path_component = nfs_path_component(path, limit);
+                if (path_component)
+                        return path_component;
         }
         return path;
 }
@@ -108,6 +132,58 @@ static size_t nfs_parse_server_name(char *string, size_t len,
         return ret;
 }
 
+static rpc_authflavor_t nfs4_negotiate_security(struct inode *inode, struct qstr *name)
+{
+        struct page *page;
+        struct nfs4_secinfo_flavors *flavors;
+        rpc_authflavor_t flavor;
+        int err;
+
+        page = alloc_page(GFP_KERNEL);
+        if (!page)
+                return -ENOMEM;
+        flavors = page_address(page);
+
+        err = nfs4_proc_secinfo(inode, name, flavors);
+        if (err < 0) {
+                flavor = err;
+                goto out;
+        }
+
+        flavor = nfs_find_best_sec(flavors);
+
+out:
+        put_page(page);
+        return flavor;
+}
+
+/*
+ * Please call rpc_shutdown_client() when you are done with this client.
+ */
+struct rpc_clnt *nfs4_create_sec_client(struct rpc_clnt *clnt, struct inode *inode,
+                                        struct qstr *name)
+{
+        struct rpc_clnt *clone;
+        struct rpc_auth *auth;
+        rpc_authflavor_t flavor;
+
+        flavor = nfs4_negotiate_security(inode, name);
+        if (flavor < 0)
+                return ERR_PTR(flavor);
+
+        clone = rpc_clone_client(clnt);
+        if (IS_ERR(clone))
+                return clone;
+
+        auth = rpcauth_create(flavor, clone);
+        if (!auth) {
+                rpc_shutdown_client(clone);
+                clone = ERR_PTR(-EIO);
+        }
+
+        return clone;
+}
+
 static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                                      char *page, char *page2,
                                      const struct nfs4_fs_location *location)
@@ -224,7 +300,7 @@ out:
  * @dentry - dentry of referral
  *
  */
-struct vfsmount *nfs_do_refmount(struct dentry *dentry)
+struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry)
 {
         struct vfsmount *mnt = ERR_PTR(-ENOMEM);
         struct dentry *parent;
@@ -250,7 +326,7 @@ struct vfsmount *nfs_do_refmount(struct dentry *dentry)
         dprintk("%s: getting locations for %s/%s\n",
                 __func__, parent->d_name.name, dentry->d_name.name);
 
-        err = nfs4_proc_fs_locations(parent->d_inode, &dentry->d_name, fs_locations, page);
+        err = nfs4_proc_fs_locations(client, parent->d_inode, &dentry->d_name, fs_locations, page);
         dput(parent);
         if (err != 0 ||
             fs_locations->nlocations <= 0 ||
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f82bde005a82..99650aaf8937 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -838,7 +838,8 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
         p->o_arg.open_flags = flags;
         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
         p->o_arg.clientid = server->nfs_client->cl_clientid;
-        p->o_arg.id = sp->so_seqid.owner_id;
+        p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
+        p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
         p->o_arg.name = &dentry->d_name;
         p->o_arg.server = server;
         p->o_arg.bitmask = server->attr_bitmask;
@@ -1466,8 +1467,7 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
                         goto unlock_no_action;
                 rcu_read_unlock();
         }
-        /* Update sequence id. */
-        data->o_arg.id = sp->so_seqid.owner_id;
+        /* Update client id. */
         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
@@ -1954,10 +1954,19 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
         };
         int err;
         do {
-                err = nfs4_handle_exception(server,
-                                _nfs4_do_setattr(inode, cred, fattr, sattr, state),
-                                &exception);
+                err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
+                switch (err) {
+                case -NFS4ERR_OPENMODE:
+                        if (state && !(state->state & FMODE_WRITE)) {
+                                err = -EBADF;
+                                if (sattr->ia_valid & ATTR_OPEN)
+                                        err = -EACCES;
+                                goto out;
+                        }
+                }
+                err = nfs4_handle_exception(server, err, &exception);
         } while (exception.retry);
+out:
         return err;
 }
 
@@ -2368,8 +2377,9 @@ static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  * Note that we'll actually follow the referral later when
  * we detect fsid mismatch in inode revalidation
  */
-static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
-                             struct nfs_fattr *fattr, struct nfs_fh *fhandle)
+static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
+                             const struct qstr *name, struct nfs_fattr *fattr,
+                             struct nfs_fh *fhandle)
 {
         int status = -ENOMEM;
         struct page *page = NULL;
@@ -2382,7 +2392,7 @@ static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
         if (locations == NULL)
                 goto out;
 
-        status = nfs4_proc_fs_locations(dir, name, locations, page);
+        status = nfs4_proc_fs_locations(client, dir, name, locations, page);
         if (status != 0)
                 goto out;
         /* Make sure server returned a different fsid for the referral */
@@ -2519,39 +2529,84 @@ static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
         return status;
 }
 
-void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
+static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
 {
-        memset(fh, 0, sizeof(struct nfs_fh));
-        fattr->fsid.major = 1;
         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
-                NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
+                NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
         fattr->nlink = 2;
 }
 
-static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
-                            struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
+                                   struct qstr *name, struct nfs_fh *fhandle,
+                                   struct nfs_fattr *fattr)
 {
         struct nfs4_exception exception = { };
+        struct rpc_clnt *client = *clnt;
         int err;
         do {
-                int status;
-
-                status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
-                switch (status) {
+                err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
+                switch (err) {
                 case -NFS4ERR_BADNAME:
-                        return -ENOENT;
+                        err = -ENOENT;
+                        goto out;
                 case -NFS4ERR_MOVED:
-                        return nfs4_get_referral(dir, name, fattr, fhandle);
+                        err = nfs4_get_referral(client, dir, name, fattr, fhandle);
+                        goto out;
                 case -NFS4ERR_WRONGSEC:
-                        nfs_fixup_secinfo_attributes(fattr, fhandle);
+                        err = -EPERM;
+                        if (client != *clnt)
+                                goto out;
+
+                        client = nfs4_create_sec_client(client, dir, name);
+                        if (IS_ERR(client))
+                                return PTR_ERR(client);
+
+                        exception.retry = 1;
+                        break;
+                default:
+                        err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
                 }
-                err = nfs4_handle_exception(NFS_SERVER(dir),
-                                status, &exception);
         } while (exception.retry);
+
+out:
+        if (err == 0)
+                *clnt = client;
+        else if (client != *clnt)
+                rpc_shutdown_client(client);
+
         return err;
 }
 
+static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
+                            struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+        int status;
+        struct rpc_clnt *client = NFS_CLIENT(dir);
+
+        status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
+        if (client != NFS_CLIENT(dir)) {
+                rpc_shutdown_client(client);
+                nfs_fixup_secinfo_attributes(fattr);
+        }
+        return status;
+}
+
+struct rpc_clnt *
+nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
+                            struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+        int status;
+        struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
+
+        status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
+        if (status < 0) {
+                rpc_shutdown_client(client);
+                return ERR_PTR(status);
+        }
+        return client;
+}
+
 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 {
         struct nfs_server *server = NFS_SERVER(inode);
@@ -3619,16 +3674,16 @@ out:
         return ret;
 }
 
-static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
+static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
 {
         struct nfs4_cached_acl *acl;
 
-        if (buf && acl_len <= PAGE_SIZE) {
+        if (pages && acl_len <= PAGE_SIZE) {
                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
                 if (acl == NULL)
                         goto out;
                 acl->cached = 1;
-                memcpy(acl->data, buf, acl_len);
+                _copy_from_pages(acl->data, pages, pgbase, acl_len);
         } else {
                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
                 if (acl == NULL)
@@ -3661,7 +3716,6 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
         struct nfs_getaclres res = {
                 .acl_len = buflen,
         };
-        void *resp_buf;
         struct rpc_message msg = {
                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
                 .rpc_argp = &args,
@@ -3675,24 +3729,27 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
         if (npages == 0)
                 npages = 1;
 
+        /* Add an extra page to handle the bitmap returned */
+        npages++;
+
         for (i = 0; i < npages; i++) {
                 pages[i] = alloc_page(GFP_KERNEL);
                 if (!pages[i])
                         goto out_free;
         }
-        if (npages > 1) {
-                /* for decoding across pages */
-                res.acl_scratch = alloc_page(GFP_KERNEL);
-                if (!res.acl_scratch)
-                        goto out_free;
-        }
+
+        /* for decoding across pages */
+        res.acl_scratch = alloc_page(GFP_KERNEL);
+        if (!res.acl_scratch)
+                goto out_free;
+
         args.acl_len = npages * PAGE_SIZE;
         args.acl_pgbase = 0;
+
         /* Let decode_getfacl know not to fail if the ACL data is larger than
          * the page we send as a guess */
         if (buf == NULL)
                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
-        resp_buf = page_address(pages[0]);
 
         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
                 __func__, buf, buflen, npages, args.acl_len);
@@ -3703,9 +3760,9 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
 
         acl_len = res.acl_len - res.acl_data_offset;
         if (acl_len > args.acl_len)
-                nfs4_write_cached_acl(inode, NULL, acl_len);
+                nfs4_write_cached_acl(inode, NULL, 0, acl_len);
         else
-                nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
+                nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
                                       acl_len);
         if (buf) {
                 ret = -ERANGE;
@@ -4558,7 +4615,9 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *f
 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
 {
         struct nfs_server *server = NFS_SERVER(state->inode);
-        struct nfs4_exception exception = { };
+        struct nfs4_exception exception = {
+                .inode = state->inode,
+        };
         int err;
 
         do {
@@ -4576,7 +4635,9 @@ static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request
 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
 {
         struct nfs_server *server = NFS_SERVER(state->inode);
-        struct nfs4_exception exception = { };
+        struct nfs4_exception exception = {
+                .inode = state->inode,
+        };
         int err;
 
         err = nfs4_set_lock_state(state, request);
@@ -4676,6 +4737,7 @@ static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *
 {
         struct nfs4_exception exception = {
                 .state = state,
+                .inode = state->inode,
         };
         int err;
 
@@ -4721,6 +4783,20 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
 
         if (state == NULL)
                 return -ENOLCK;
+        /*
+         * Don't rely on the VFS having checked the file open mode,
+         * since it won't do this for flock() locks.
+         */
+        switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
+        case F_RDLCK:
+                if (!(filp->f_mode & FMODE_READ))
+                        return -EBADF;
+                break;
+        case F_WRLCK:
+                if (!(filp->f_mode & FMODE_WRITE))
+                        return -EBADF;
+        }
+
         do {
                 status = nfs4_proc_setlk(state, cmd, request);
                 if ((status != -EAGAIN) || IS_SETLK(cmd))
@@ -4891,8 +4967,10 @@ static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
         fattr->nlink = 2;
 }
 
-int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
-                struct nfs4_fs_locations *fs_locations, struct page *page)
+static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+                                   const struct qstr *name,
+                                   struct nfs4_fs_locations *fs_locations,
+                                   struct page *page)
 {
         struct nfs_server *server = NFS_SERVER(dir);
         u32 bitmask[2] = {
@@ -4926,11 +5004,26 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
         nfs_fattr_init(&fs_locations->fattr);
         fs_locations->server = server;
         fs_locations->nlocations = 0;
-        status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+        status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
         dprintk("%s: returned status = %d\n", __func__, status);
         return status;
 }
 
+int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+                           const struct qstr *name,
+                           struct nfs4_fs_locations *fs_locations,
+                           struct page *page)
+{
+        struct nfs4_exception exception = { };
+        int err;
+        do {
+                err = nfs4_handle_exception(NFS_SERVER(dir),
+                                _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
+                                &exception);
+        } while (exception.retry);
+        return err;
+}
+
 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
 {
         int status;
@@ -4953,8 +5046,8 @@ static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct
         return status;
 }
 
-static int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
-                struct nfs4_secinfo_flavors *flavors)
+int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
+                      struct nfs4_secinfo_flavors *flavors)
 {
         struct nfs4_exception exception = { };
         int err;
@@ -5029,10 +5122,9 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
         nfs4_construct_boot_verifier(clp, &verifier);
 
         args.id_len = scnprintf(args.id, sizeof(args.id),
-                                "%s/%s.%s/%u",
+                                "%s/%s/%u",
                                 clp->cl_ipaddr,
-                                init_utsname()->nodename,
-                                init_utsname()->domainname,
+                                clp->cl_rpcclient->cl_nodename,
                                 clp->cl_rpcclient->cl_auth->au_flavor);
 
         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 0f43414eb25a..7f0fcfc1fe9d 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -393,6 +393,7 @@ nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
 static void
 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
 {
+        sc->create_time = ktime_get();
         sc->flags = 0;
         sc->counter = 0;
         spin_lock_init(&sc->lock);
@@ -434,13 +435,17 @@ nfs4_alloc_state_owner(struct nfs_server *server,
 static void
 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 {
-        if (!RB_EMPTY_NODE(&sp->so_server_node)) {
+        struct rb_node *rb_node = &sp->so_server_node;
+
+        if (!RB_EMPTY_NODE(rb_node)) {
                 struct nfs_server *server = sp->so_server;
                 struct nfs_client *clp = server->nfs_client;
 
                 spin_lock(&clp->cl_lock);
-                rb_erase(&sp->so_server_node, &server->state_owners);
-                RB_CLEAR_NODE(&sp->so_server_node);
+                if (!RB_EMPTY_NODE(rb_node)) {
+                        rb_erase(rb_node, &server->state_owners);
+                        RB_CLEAR_NODE(rb_node);
+                }
                 spin_unlock(&clp->cl_lock);
         }
 }
@@ -516,6 +521,14 @@ out:
 /**
  * nfs4_put_state_owner - Release a nfs4_state_owner
  * @sp: state owner data to release
+ *
+ * Note that we keep released state owners on an LRU
+ * list.
+ * This caches valid state owners so that they can be
+ * reused, to avoid the OPEN_CONFIRM on minor version 0.
+ * It also pins the uniquifier of dropped state owners for
+ * a while, to ensure that those state owner names are
+ * never reused.
  */
 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 {
@@ -525,15 +538,9 @@ void nfs4_put_state_owner(struct nfs4_state_owner *sp)
         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
                 return;
 
-        if (!RB_EMPTY_NODE(&sp->so_server_node)) {
-                sp->so_expires = jiffies;
-                list_add_tail(&sp->so_lru, &server->state_owners_lru);
-                spin_unlock(&clp->cl_lock);
-        } else {
-                nfs4_remove_state_owner_locked(sp);
-                spin_unlock(&clp->cl_lock);
-                nfs4_free_state_owner(sp);
-        }
+        sp->so_expires = jiffies;
+        list_add_tail(&sp->so_lru, &server->state_owners_lru);
+        spin_unlock(&clp->cl_lock);
 }
 
 /**
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index c74fdb114b48..c54aae364bee 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -74,7 +74,7 @@ static int nfs4_stat_to_errno(int);
 /* lock,open owner id:
  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
  */
-#define open_owner_id_maxsz     (1 + 1 + 4)
+#define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 #define lock_owner_id_maxsz     (1 + 1 + 4)
 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
@@ -1340,12 +1340,13 @@ static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_opena
  */
         encode_nfs4_seqid(xdr, arg->seqid);
         encode_share_access(xdr, arg->fmode);
-        p = reserve_space(xdr, 32);
+        p = reserve_space(xdr, 36);
         p = xdr_encode_hyper(p, arg->clientid);
-        *p++ = cpu_to_be32(20);
+        *p++ = cpu_to_be32(24);
         p = xdr_encode_opaque_fixed(p, "open id:", 8);
         *p++ = cpu_to_be32(arg->server->s_dev);
-        xdr_encode_hyper(p, arg->id);
+        *p++ = cpu_to_be32(arg->id.uniquifier);
+        xdr_encode_hyper(p, arg->id.create_time);
 }
 
 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
@@ -4257,8 +4258,6 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
         status = decode_attr_error(xdr, bitmap, &err);
         if (status < 0)
                 goto xdr_error;
-        if (err == -NFS4ERR_WRONGSEC)
-                nfs_fixup_secinfo_attributes(fattr, fh);
 
         status = decode_attr_filehandle(xdr, bitmap, fh);
         if (status < 0)
@@ -4901,11 +4900,19 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
                  bitmap[3] = {0};
         struct kvec *iov = req->rq_rcv_buf.head;
         int status;
+        size_t page_len = xdr->buf->page_len;
 
         res->acl_len = 0;
         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
                 goto out;
+
         bm_p = xdr->p;
+        res->acl_data_offset = be32_to_cpup(bm_p) + 2;
+        res->acl_data_offset <<= 2;
+        /* Check if the acl data starts beyond the allocated buffer */
+        if (res->acl_data_offset > page_len)
+                return -ERANGE;
+
         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
                 goto out;
         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
@@ -4915,28 +4922,24 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
                 return -EIO;
         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
                 size_t hdrlen;
-                u32 recvd;
 
                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
                  * are stored with the acl data to handle the problem of
                  * variable length bitmaps.*/
                 xdr->p = bm_p;
-                res->acl_data_offset = be32_to_cpup(bm_p) + 2;
-                res->acl_data_offset <<= 2;
 
                 /* We ignore &savep and don't do consistency checks on
                  * the attr length.  Let userspace figure it out.... */
                 hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
                 attrlen += res->acl_data_offset;
-                recvd = req->rq_rcv_buf.len - hdrlen;
-                if (attrlen > recvd) {
+                if (attrlen > page_len) {
                         if (res->acl_flags & NFS4_ACL_LEN_REQUEST) {
                                 /* getxattr interface called with a NULL buf */
                                 res->acl_len = attrlen;
                                 goto out;
                         }
-                        dprintk("NFS: acl reply: attrlen %u > recvd %u\n",
-                                        attrlen, recvd);
+                        dprintk("NFS: acl reply: attrlen %u > page_len %zu\n",
+                                        attrlen, page_len);
                         return -EINVAL;
                 }
                 xdr_read_pages(xdr, attrlen);
@@ -5089,16 +5092,13 @@ out_err:
         return -EINVAL;
 }
 
-static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
+static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
 {
         struct nfs4_secinfo_flavor *sec_flavor;
         int status;
         __be32 *p;
         int i, num_flavors;
 
-        status = decode_op_hdr(xdr, OP_SECINFO);
-        if (status)
-                goto out;
         p = xdr_inline_decode(xdr, 4);
         if (unlikely(!p))
                 goto out_overflow;
@@ -5124,6 +5124,7 @@ static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
                 res->flavors->num_flavors++;
         }
 
+        status = 0;
 out:
         return status;
 out_overflow:
@@ -5131,7 +5132,23 @@ out_overflow:
         return -EIO;
 }
 
+static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
+{
+        int status = decode_op_hdr(xdr, OP_SECINFO);
+        if (status)
+                return status;
+        return decode_secinfo_common(xdr, res);
+}
+
 #if defined(CONFIG_NFS_V4_1)
+static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
+{
+        int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
+        if (status)
+                return status;
+        return decode_secinfo_common(xdr, res);
+}
+
 static int decode_exchange_id(struct xdr_stream *xdr,
                               struct nfs41_exchange_id_res *res)
 {
@@ -6816,7 +6833,7 @@ static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
         status = decode_putrootfh(xdr);
         if (status)
                 goto out;
-        status = decode_secinfo(xdr, res);
+        status = decode_secinfo_no_name(xdr, res);
 out:
         return status;
 }
diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c
index 8d45f1c318ce..595c5fc21a19 100644
--- a/fs/nfs/objlayout/objlayout.c
+++ b/fs/nfs/objlayout/objlayout.c
@@ -604,7 +604,6 @@ int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
 {
         struct objlayout_deviceinfo *odi;
         struct pnfs_device pd;
-        struct super_block *sb;
         struct page *page, **pages;
         u32 *p;
         int err;
@@ -623,7 +622,6 @@ int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
         pd.pglen = PAGE_SIZE;
         pd.mincount = 0;
 
-        sb = pnfslay->plh_inode->i_sb;
         err = nfs4_proc_getdeviceinfo(NFS_SERVER(pnfslay->plh_inode), &pd);
         dprintk("%s nfs_getdeviceinfo returned %d\n", __func__, err);
         if (err)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index b5d451586943..38512bcd2e98 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -587,7 +587,7 @@ send_layoutget(struct pnfs_layout_hdr *lo,
 
         /* allocate pages for xdr post processing */
         max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
-        max_pages = max_resp_sz >> PAGE_SHIFT;
+        max_pages = nfs_page_array_len(0, max_resp_sz);
 
         pages = kcalloc(max_pages, sizeof(struct page *), gfp_flags);
         if (!pages)
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 9a0e8ef4a409..0a4be28c2ea3 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -322,7 +322,7 @@ out_bad:
         while (!list_empty(res)) {
                 data = list_entry(res->next, struct nfs_read_data, list);
                 list_del(&data->list);
-                nfs_readdata_free(data);
+                nfs_readdata_release(data);
         }
         nfs_readpage_release(req);
         return -ENOMEM;
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 37412f706b32..4ac7fca7e4bf 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2428,7 +2428,7 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
         dprintk("--> nfs_xdev_mount()\n");
 
         /* create a new volume representation */
-        server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
+        server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
         if (IS_ERR(server)) {
                 error = PTR_ERR(server);
                 goto out_err_noserver;
@@ -2767,11 +2767,15 @@ static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
         char *root_devname;
         size_t len;
 
-        len = strlen(hostname) + 3;
+        len = strlen(hostname) + 5;
         root_devname = kmalloc(len, GFP_KERNEL);
         if (root_devname == NULL)
                 return ERR_PTR(-ENOMEM);
-        snprintf(root_devname, len, "%s:/", hostname);
+        /* Does hostname needs to be enclosed in brackets? */
+        if (strchr(hostname, ':'))
+                snprintf(root_devname, len, "[%s]:/", hostname);
+        else
+                snprintf(root_devname, len, "%s:/", hostname);
         root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
         kfree(root_devname);
         return root_mnt;
@@ -2951,7 +2955,7 @@ nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
         dprintk("--> nfs4_xdev_mount()\n");
 
         /* create a new volume representation */
-        server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
+        server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
         if (IS_ERR(server)) {
                 error = PTR_ERR(server);
                 goto out_err_noserver;
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 2c68818f68ac..c07462320f6b 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -682,7 +682,8 @@ static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
                 req->wb_bytes = rqend - req->wb_offset;
 out_unlock:
         spin_unlock(&inode->i_lock);
-        nfs_clear_request_commit(req);
+        if (req)
+                nfs_clear_request_commit(req);
         return req;
 out_flushme:
         spin_unlock(&inode->i_lock);
@@ -1018,7 +1019,7 @@ out_bad:
         while (!list_empty(res)) {
                 data = list_entry(res->next, struct nfs_write_data, list);
                 list_del(&data->list);
-                nfs_writedata_free(data);
+                nfs_writedata_release(data);
         }
         nfs_redirty_request(req);
         return -ENOMEM;