Merge branch 'v2.6.35'

19 files changed, 138 insertions, 75 deletions

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index d61e3b2..36d961f 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -146,7 +146,7 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 		while (rdir->head < rdir->tail) {
 			p9stat_init(&st);
 			err = p9stat_read(rdir->buf + rdir->head,
-						buflen - rdir->head, &st,
+						rdir->tail - rdir->head, &st,
 						fid->clnt->proto_version);
 			if (err) {
 				P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig
index 04b8280..bc87b9c 100644
--- a/fs/ceph/Kconfig
+++ b/fs/ceph/Kconfig
@@ -2,7 +2,7 @@ config CEPH_FS
         tristate "Ceph distributed file system (EXPERIMENTAL)"
 	depends on INET && EXPERIMENTAL
 	select LIBCRC32C
-	select CONFIG_CRYPTO_AES
+	select CRYPTO_AES
 	help
 	  Choose Y or M here to include support for mounting the
 	  experimental Ceph distributed file system.  Ceph is an extremely
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 74144d6..b81be9a 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -627,7 +627,7 @@ retry:
 	if (fmode >= 0)
 		__ceph_get_fmode(ci, fmode);
 	spin_unlock(&inode->i_lock);
-	wake_up(&ci->i_cap_wq);
+	wake_up_all(&ci->i_cap_wq);
 	return 0;
 }
 
@@ -1181,7 +1181,7 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
 	}
 
 	if (wake)
-		wake_up(&ci->i_cap_wq);
+		wake_up_all(&ci->i_cap_wq);
 
 	return delayed;
 }
@@ -2153,7 +2153,7 @@ void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
 	else if (flushsnaps)
 		ceph_flush_snaps(ci);
 	if (wake)
-		wake_up(&ci->i_cap_wq);
+		wake_up_all(&ci->i_cap_wq);
 	if (put)
 		iput(inode);
 }
@@ -2229,7 +2229,7 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 		iput(inode);
 	} else if (complete_capsnap) {
 		ceph_flush_snaps(ci);
-		wake_up(&ci->i_cap_wq);
+		wake_up_all(&ci->i_cap_wq);
 	}
 	if (drop_capsnap)
 		iput(inode);
@@ -2405,7 +2405,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
 	if (queue_invalidate)
 		ceph_queue_invalidate(inode);
 	if (wake)
-		wake_up(&ci->i_cap_wq);
+		wake_up_all(&ci->i_cap_wq);
 
 	if (check_caps == 1)
 		ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
@@ -2460,7 +2460,7 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
 					 struct ceph_inode_info,
 					 i_flushing_item)->vfs_inode);
 		mdsc->num_cap_flushing--;
-		wake_up(&mdsc->cap_flushing_wq);
+		wake_up_all(&mdsc->cap_flushing_wq);
 		dout(" inode %p now !flushing\n", inode);
 
 		if (ci->i_dirty_caps == 0) {
@@ -2472,7 +2472,7 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
 		}
 	}
 	spin_unlock(&mdsc->cap_dirty_lock);
-	wake_up(&ci->i_cap_wq);
+	wake_up_all(&ci->i_cap_wq);
 
 out:
 	spin_unlock(&inode->i_lock);
@@ -2984,6 +2984,7 @@ int ceph_encode_dentry_release(void **p, struct dentry *dentry,
 		memcpy(*p, dentry->d_name.name, dentry->d_name.len);
 		*p += dentry->d_name.len;
 		rel->dname_seq = cpu_to_le32(di->lease_seq);
+		__ceph_mdsc_drop_dentry_lease(dentry);
 	}
 	spin_unlock(&dentry->d_lock);
 	return ret;
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index f857193..f94ed3c 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -266,6 +266,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	spin_lock(&inode->i_lock);
 	if ((filp->f_pos == 2 || fi->dentry) &&
 	    !ceph_test_opt(client, NOASYNCREADDIR) &&
+	    ceph_snap(inode) != CEPH_SNAPDIR &&
 	    (ci->i_ceph_flags & CEPH_I_COMPLETE) &&
 	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
 		err = __dcache_readdir(filp, dirent, filldir);
@@ -1013,18 +1014,22 @@ out_touch:
 
 /*
  * When a dentry is released, clear the dir I_COMPLETE if it was part
- * of the current dir gen.
+ * of the current dir gen or if this is in the snapshot namespace.
  */
 static void ceph_dentry_release(struct dentry *dentry)
 {
 	struct ceph_dentry_info *di = ceph_dentry(dentry);
 	struct inode *parent_inode = dentry->d_parent->d_inode;
+	u64 snapid = ceph_snap(parent_inode);
 
-	if (parent_inode) {
+	dout("dentry_release %p parent %p\n", dentry, parent_inode);
+
+	if (parent_inode && snapid != CEPH_SNAPDIR) {
 		struct ceph_inode_info *ci = ceph_inode(parent_inode);
 
 		spin_lock(&parent_inode->i_lock);
-		if (ci->i_shared_gen == di->lease_shared_gen) {
+		if (ci->i_shared_gen == di->lease_shared_gen ||
+		    snapid <= CEPH_MAXSNAP) {
 			dout(" clearing %p complete (d_release)\n",
 			     parent_inode);
 			ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
@@ -1241,7 +1246,9 @@ struct dentry_operations ceph_dentry_ops = {
 
 struct dentry_operations ceph_snapdir_dentry_ops = {
 	.d_revalidate = ceph_snapdir_d_revalidate,
+	.d_release = ceph_dentry_release,
 };
 
 struct dentry_operations ceph_snap_dentry_ops = {
+	.d_release = ceph_dentry_release,
 };
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 6251a15..7c08698 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -265,7 +265,7 @@ int ceph_release(struct inode *inode, struct file *file)
 	kmem_cache_free(ceph_file_cachep, cf);
 
 	/* wake up anyone waiting for caps on this inode */
-	wake_up(&ci->i_cap_wq);
+	wake_up_all(&ci->i_cap_wq);
 	return 0;
 }
 
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 8f9b9fe..389f9db 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1199,8 +1199,10 @@ retry_lookup:
 				goto out;
 			}
 			err = ceph_init_dentry(dn);
-			if (err < 0)
+			if (err < 0) {
+				dput(dn);
 				goto out;
+			}
 		} else if (dn->d_inode &&
 			   (ceph_ino(dn->d_inode) != vino.ino ||
 			    ceph_snap(dn->d_inode) != vino.snap)) {
@@ -1499,7 +1501,7 @@ retry:
 	if (wrbuffer_refs == 0)
 		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
 	if (wake)
-		wake_up(&ci->i_cap_wq);
+		wake_up_all(&ci->i_cap_wq);
 }
 
 
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 416c08d..dd440bd 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -868,7 +868,7 @@ static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
 {
 	struct ceph_inode_info *ci = ceph_inode(inode);
 
-	wake_up(&ci->i_cap_wq);
+	wake_up_all(&ci->i_cap_wq);
 	if (arg) {
 		spin_lock(&inode->i_lock);
 		ci->i_wanted_max_size = 0;
@@ -1564,7 +1564,7 @@ static void complete_request(struct ceph_mds_client *mdsc,
 	if (req->r_callback)
 		req->r_callback(mdsc, req);
 	else
-		complete(&req->r_completion);
+		complete_all(&req->r_completion);
 }
 
 /*
@@ -1932,7 +1932,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 	if (head->safe) {
 		req->r_got_safe = true;
 		__unregister_request(mdsc, req);
-		complete(&req->r_safe_completion);
+		complete_all(&req->r_safe_completion);
 
 		if (req->r_got_unsafe) {
 			/*
@@ -1947,7 +1947,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 
 			/* last unsafe request during umount? */
 			if (mdsc->stopping && !__get_oldest_req(mdsc))
-				complete(&mdsc->safe_umount_waiters);
+				complete_all(&mdsc->safe_umount_waiters);
 			mutex_unlock(&mdsc->mutex);
 			goto out;
 		}
@@ -2126,7 +2126,7 @@ static void handle_session(struct ceph_mds_session *session,
 			pr_info("mds%d reconnect denied\n", session->s_mds);
 		remove_session_caps(session);
 		wake = 1; /* for good measure */
-		complete(&mdsc->session_close_waiters);
+		complete_all(&mdsc->session_close_waiters);
 		kick_requests(mdsc, mds);
 		break;
 
diff --git a/fs/ceph/mon_client.c b/fs/ceph/mon_client.c
index cc115ea..54fe01c 100644
--- a/fs/ceph/mon_client.c
+++ b/fs/ceph/mon_client.c
@@ -345,7 +345,7 @@ static void ceph_monc_handle_map(struct ceph_mon_client *monc,
 
 out:
 	mutex_unlock(&monc->mutex);
-	wake_up(&client->auth_wq);
+	wake_up_all(&client->auth_wq);
 }
 
 /*
@@ -462,7 +462,7 @@ static void handle_statfs_reply(struct ceph_mon_client *monc,
 	}
 	mutex_unlock(&monc->mutex);
 	if (req) {
-		complete(&req->completion);
+		complete_all(&req->completion);
 		put_generic_request(req);
 	}
 	return;
@@ -718,7 +718,7 @@ static void handle_auth_reply(struct ceph_mon_client *monc,
 				     monc->m_auth->front_max);
 	if (ret < 0) {
 		monc->client->auth_err = ret;
-		wake_up(&monc->client->auth_wq);
+		wake_up_all(&monc->client->auth_wq);
 	} else if (ret > 0) {
 		__send_prepared_auth_request(monc, ret);
 	} else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) {
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index 92b7251..e385223 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -862,12 +862,12 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
 	if (req->r_callback)
 		req->r_callback(req, msg);
 	else
-		complete(&req->r_completion);
+		complete_all(&req->r_completion);
 
 	if (flags & CEPH_OSD_FLAG_ONDISK) {
 		if (req->r_safe_callback)
 			req->r_safe_callback(req, msg);
-		complete(&req->r_safe_completion);  /* fsync waiter */
+		complete_all(&req->r_safe_completion);  /* fsync waiter */
 	}
 
 done:
@@ -1083,7 +1083,7 @@ done:
 	if (newmap)
 		kick_requests(osdc, NULL);
 	up_read(&osdc->map_sem);
-	wake_up(&osdc->client->auth_wq);
+	wake_up_all(&osdc->client->auth_wq);
 	return;
 
 bad:
diff --git a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
index 277f8b3..416d46a 100644
--- a/fs/ceph/osdmap.c
+++ b/fs/ceph/osdmap.c
@@ -831,12 +831,13 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 		/* remove any? */
 		while (rbp && pgid_cmp(rb_entry(rbp, struct ceph_pg_mapping,
 						node)->pgid, pgid) <= 0) {
-			struct rb_node *cur = rbp;
+			struct ceph_pg_mapping *cur =
+				rb_entry(rbp, struct ceph_pg_mapping, node);
+			
 			rbp = rb_next(rbp);
-			dout(" removed pg_temp %llx\n",
-			     *(u64 *)&rb_entry(cur, struct ceph_pg_mapping,
-					       node)->pgid);
-			rb_erase(cur, &map->pg_temp);
+			dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);
+			rb_erase(&cur->node, &map->pg_temp);
+			kfree(cur);
 		}
 
 		if (pglen) {
@@ -852,19 +853,22 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 			for (j = 0; j < pglen; j++)
 				pg->osds[j] = ceph_decode_32(p);
 			err = __insert_pg_mapping(pg, &map->pg_temp);
-			if (err)
+			if (err) {
+				kfree(pg);
 				goto bad;
+			}
 			dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,
 			     pglen);
 		}
 	}
 	while (rbp) {
-		struct rb_node *cur = rbp;
+		struct ceph_pg_mapping *cur =
+			rb_entry(rbp, struct ceph_pg_mapping, node);
+
 		rbp = rb_next(rbp);
-		dout(" removed pg_temp %llx\n",
-		     *(u64 *)&rb_entry(cur, struct ceph_pg_mapping,
-				       node)->pgid);
-		rb_erase(cur, &map->pg_temp);
+		dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);
+		rb_erase(&cur->node, &map->pg_temp);
+		kfree(cur);
 	}
 
 	/* ignore the rest */
diff --git a/fs/cifs/dns_resolve.c b/fs/cifs/dns_resolve.c
index 49315cb..853a968 100644
--- a/fs/cifs/dns_resolve.c
+++ b/fs/cifs/dns_resolve.c
@@ -227,7 +227,7 @@ failed_put_cred:
 	return ret;
 }
 
-void __exit cifs_exit_dns_resolver(void)
+void cifs_exit_dns_resolver(void)
 {
 	key_revoke(dns_resolver_cache->thread_keyring);
 	unregister_key_type(&key_type_dns_resolver);
diff --git a/fs/cifs/dns_resolve.h b/fs/cifs/dns_resolve.h
index 26b9eaa..5d7f291 100644
--- a/fs/cifs/dns_resolve.h
+++ b/fs/cifs/dns_resolve.h
@@ -25,7 +25,7 @@
 
 #ifdef __KERNEL__
 extern int __init cifs_init_dns_resolver(void);
-extern void __exit cifs_exit_dns_resolver(void);
+extern void cifs_exit_dns_resolver(void);
 extern int dns_resolve_server_name_to_ip(const char *unc, char **ip_addr);
 #endif /* KERNEL */
 
diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index 2d8dbce..46c4dd8 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -31,9 +31,9 @@ static struct mutex ecryptfs_msg_ctx_lists_mux;
 
 static struct hlist_head *ecryptfs_daemon_hash;
 struct mutex ecryptfs_daemon_hash_mux;
-static int ecryptfs_hash_buckets;
+static int ecryptfs_hash_bits;
 #define ecryptfs_uid_hash(uid) \
-        hash_long((unsigned long)uid, ecryptfs_hash_buckets)
+        hash_long((unsigned long)uid, ecryptfs_hash_bits)
 
 static u32 ecryptfs_msg_counter;
 static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
@@ -486,18 +486,19 @@ int ecryptfs_init_messaging(void)
 	}
 	mutex_init(&ecryptfs_daemon_hash_mux);
 	mutex_lock(&ecryptfs_daemon_hash_mux);
-	ecryptfs_hash_buckets = 1;
-	while (ecryptfs_number_of_users >> ecryptfs_hash_buckets)
-		ecryptfs_hash_buckets++;
+	ecryptfs_hash_bits = 1;
+	while (ecryptfs_number_of_users >> ecryptfs_hash_bits)
+		ecryptfs_hash_bits++;
 	ecryptfs_daemon_hash = kmalloc((sizeof(struct hlist_head)
-					* ecryptfs_hash_buckets), GFP_KERNEL);
+					* (1 << ecryptfs_hash_bits)),
+				       GFP_KERNEL);
 	if (!ecryptfs_daemon_hash) {
 		rc = -ENOMEM;
 		printk(KERN_ERR "%s: Failed to allocate memory\n", __func__);
 		mutex_unlock(&ecryptfs_daemon_hash_mux);
 		goto out;
 	}
-	for (i = 0; i < ecryptfs_hash_buckets; i++)
+	for (i = 0; i < (1 << ecryptfs_hash_bits); i++)
 		INIT_HLIST_HEAD(&ecryptfs_daemon_hash[i]);
 	mutex_unlock(&ecryptfs_daemon_hash_mux);
 	ecryptfs_msg_ctx_arr = kmalloc((sizeof(struct ecryptfs_msg_ctx)
@@ -554,7 +555,7 @@ void ecryptfs_release_messaging(void)
 		int i;
 
 		mutex_lock(&ecryptfs_daemon_hash_mux);
-		for (i = 0; i < ecryptfs_hash_buckets; i++) {
+		for (i = 0; i < (1 << ecryptfs_hash_bits); i++) {
 			int rc;
 
 			hlist_for_each_entry(daemon, elem,
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 26ca336..6b48d7c 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -1231,6 +1231,25 @@ static int do_filldir_main(struct gfs2_inode *dip, u64 *offset,
 	return 0;
 }
 
+static void *gfs2_alloc_sort_buffer(unsigned size)
+{
+	void *ptr = NULL;
+
+	if (size < KMALLOC_MAX_SIZE)
+		ptr = kmalloc(size, GFP_NOFS | __GFP_NOWARN);
+	if (!ptr)
+		ptr = __vmalloc(size, GFP_NOFS, PAGE_KERNEL);
+	return ptr;
+}
+
+static void gfs2_free_sort_buffer(void *ptr)
+{
+	if (is_vmalloc_addr(ptr))
+		vfree(ptr);
+	else
+		kfree(ptr);
+}
+
 static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 			      filldir_t filldir, int *copied, unsigned *depth,
 			      u64 leaf_no)
@@ -1271,7 +1290,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 	 * 99 is the maximum number of entries that can fit in a single
 	 * leaf block.
 	 */
-	larr = vmalloc((leaves + entries + 99) * sizeof(void *));
+	larr = gfs2_alloc_sort_buffer((leaves + entries + 99) * sizeof(void *));
 	if (!larr)
 		goto out;
 	darr = (const struct gfs2_dirent **)(larr + leaves);
@@ -1282,7 +1301,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 	do {
 		error = get_leaf(ip, lfn, &bh);
 		if (error)
-			goto out_kfree;
+			goto out_free;
 		lf = (struct gfs2_leaf *)bh->b_data;
 		lfn = be64_to_cpu(lf->lf_next);
 		if (lf->lf_entries) {
@@ -1291,7 +1310,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 						gfs2_dirent_gather, NULL, &g);
 			error = PTR_ERR(dent);
 			if (IS_ERR(dent))
-				goto out_kfree;
+				goto out_free;
 			if (entries2 != g.offset) {
 				fs_warn(sdp, "Number of entries corrupt in dir "
 						"leaf %llu, entries2 (%u) != "
@@ -1300,7 +1319,7 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 					entries2, g.offset);
 					
 				error = -EIO;
-				goto out_kfree;
+				goto out_free;
 			}
 			error = 0;
 			larr[leaf++] = bh;
@@ -1312,10 +1331,10 @@ static int gfs2_dir_read_leaf(struct inode *inode, u64 *offset, void *opaque,
 	BUG_ON(entries2 != entries);
 	error = do_filldir_main(ip, offset, opaque, filldir, darr,
 				entries, copied);
-out_kfree:
+out_free:
 	for(i = 0; i < leaf; i++)
 		brelse(larr[i]);
-	vfree(larr);
+	gfs2_free_sort_buffer(larr);
 out:
 	return error;
 }
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 36a5e74..f036153 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -27,6 +27,7 @@
 #include <linux/pagemap.h>
 #include <linux/aio.h>
 #include <linux/gfp.h>
+#include <linux/swap.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -493,11 +494,19 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset)
  */
 static int nfs_release_page(struct page *page, gfp_t gfp)
 {
+	struct address_space *mapping = page->mapping;
+
 	dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
 
 	/* Only do I/O if gfp is a superset of GFP_KERNEL */
-	if ((gfp & GFP_KERNEL) == GFP_KERNEL)
-		nfs_wb_page(page->mapping->host, page);
+	if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
+		int how = FLUSH_SYNC;
+
+		/* Don't let kswapd deadlock waiting for OOM RPC calls */
+		if (current_is_kswapd())
+			how = 0;
+		nfs_commit_inode(mapping->host, how);
+	}
 	/* If PagePrivate() is set, then the page is not freeable */
 	if (PagePrivate(page))
 		return 0;
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index 6bd19d8..df101d9 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -105,7 +105,7 @@ static char nfs_root_name[256] __initdata = "";
 static __be32 servaddr __initdata = 0;
 
 /* Name of directory to mount */
-static char nfs_export_path[NFS_MAXPATHLEN] __initdata = { 0, };
+static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, };
 
 /* NFS-related data */
 static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 91679e2..9f81bdd 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -222,7 +222,7 @@ static void nfs_end_page_writeback(struct page *page)
 		clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
 }
 
-static struct nfs_page *nfs_find_and_lock_request(struct page *page)
+static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
 {
 	struct inode *inode = page->mapping->host;
 	struct nfs_page *req;
@@ -241,7 +241,10 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
 		 *	 request as dirty (in which case we don't care).
 		 */
 		spin_unlock(&inode->i_lock);
-		ret = nfs_wait_on_request(req);
+		if (!nonblock)
+			ret = nfs_wait_on_request(req);
+		else
+			ret = -EAGAIN;
 		nfs_release_request(req);
 		if (ret != 0)
 			return ERR_PTR(ret);
@@ -256,12 +259,12 @@ static struct nfs_page *nfs_find_and_lock_request(struct page *page)
  * May return an error if the user signalled nfs_wait_on_request().
  */
 static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
-				struct page *page)
+				struct page *page, bool nonblock)
 {
 	struct nfs_page *req;
 	int ret = 0;
 
-	req = nfs_find_and_lock_request(page);
+	req = nfs_find_and_lock_request(page, nonblock);
 	if (!req)
 		goto out;
 	ret = PTR_ERR(req);
@@ -283,12 +286,20 @@ out:
 static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
 {
 	struct inode *inode = page->mapping->host;
+	int ret;
 
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
 	nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
 	nfs_pageio_cond_complete(pgio, page->index);
-	return nfs_page_async_flush(pgio, page);
+	ret = nfs_page_async_flush(pgio, page,
+			wbc->sync_mode == WB_SYNC_NONE ||
+			wbc->nonblocking != 0);
+	if (ret == -EAGAIN) {
+		redirty_page_for_writepage(wbc, page);
+		ret = 0;
+	}
+	return ret;
 }
 
 /*
@@ -1379,7 +1390,7 @@ static const struct rpc_call_ops nfs_commit_ops = {
 	.rpc_release = nfs_commit_release,
 };
 
-static int nfs_commit_inode(struct inode *inode, int how)
+int nfs_commit_inode(struct inode *inode, int how)
 {
 	LIST_HEAD(head);
 	int may_wait = how & FLUSH_SYNC;
@@ -1443,11 +1454,6 @@ out_mark_dirty:
 	return ret;
 }
 #else
-static int nfs_commit_inode(struct inode *inode, int how)
-{
-	return 0;
-}
-
 static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
 {
 	return 0;
@@ -1546,7 +1552,7 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
 
 	nfs_fscache_release_page(page, GFP_KERNEL);
 
-	req = nfs_find_and_lock_request(page);
+	req = nfs_find_and_lock_request(page, false);
 	ret = PTR_ERR(req);
 	if (IS_ERR(req))
 		goto out;
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 9b58d38..fff6572 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -176,7 +176,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 		if (tracer)
 			tpid = task_pid_nr_ns(tracer, ns);
 	}
-	cred = get_cred((struct cred *) __task_cred(p));
+	cred = get_task_cred(p);
 	seq_printf(m,
 		"State:\t%s\n"
 		"Tgid:\t%d\n"
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index f71246b..a7ac78f 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -28,6 +28,7 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
 	struct sysfs_dirent *target_sd = NULL;
 	struct sysfs_dirent *sd = NULL;
 	struct sysfs_addrm_cxt acxt;
+	enum kobj_ns_type ns_type;
 	int error;
 
 	BUG_ON(!name);
@@ -58,16 +59,29 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
 	if (!sd)
 		goto out_put;
 
-	if (sysfs_ns_type(parent_sd))
+	ns_type = sysfs_ns_type(parent_sd);
+	if (ns_type)
 		sd->s_ns = target->ktype->namespace(target);
 	sd->s_symlink.target_sd = target_sd;
 	target_sd = NULL;	/* reference is now owned by the symlink */
 
 	sysfs_addrm_start(&acxt, parent_sd);
-	if (warn)
-		error = sysfs_add_one(&acxt, sd);
-	else
-		error = __sysfs_add_one(&acxt, sd);
+	/* Symlinks must be between directories with the same ns_type */
+	if (!ns_type ||
+	    (ns_type == sysfs_ns_type(sd->s_symlink.target_sd->s_parent))) {
+		if (warn)
+			error = sysfs_add_one(&acxt, sd);
+		else
+			error = __sysfs_add_one(&acxt, sd);
+	} else {
+		error = -EINVAL;
+		WARN(1, KERN_WARNING
+			"sysfs: symlink across ns_types %s/%s -> %s/%s\n",
+			parent_sd->s_name,
+			sd->s_name,
+			sd->s_symlink.target_sd->s_parent->s_name,
+			sd->s_symlink.target_sd->s_name);
+	}
 	sysfs_addrm_finish(&acxt);
 
 	if (error)
@@ -122,7 +136,7 @@ void sysfs_delete_link(struct kobject *kobj, struct kobject *targ,
 {
 	const void *ns = NULL;
 	spin_lock(&sysfs_assoc_lock);
-	if (targ->sd)
+	if (targ->sd && sysfs_ns_type(kobj->sd))
 		ns = targ->sd->s_ns;
 	spin_unlock(&sysfs_assoc_lock);
 	sysfs_hash_and_remove(kobj->sd, ns, name);