Merge tag 'nfs-for-3.4-1' of git://git.linux-nfs.org/projects/trondmy…

…/linux-nfs

Pull NFS client updates for Linux 3.4 from Trond Myklebust:
 "New features include:
   - Add NFS client support for containers.

     This should enable most of the necessary functionality, including
     lockd support, and support for rpc.statd, NFSv4 idmapper and
     RPCSEC_GSS upcalls into the correct network namespace from which
     the mount system call was issued.

   - NFSv4 idmapper scalability improvements

     Base the idmapper cache on the keyring interface to allow
     concurrent access to idmapper entries.  Start the process of
     migrating users from the single-threaded daemon-based approach to
     the multi-threaded request-key based approach.

   - NFSv4.1 implementation id.

     Allows the NFSv4.1 client and server to mutually identify each
     other for logging and debugging purposes.

   - Support the 'vers=4.1' mount option for mounting NFSv4.1 instead of
     having to use the more counterintuitive 'vers=4,minorversion=1'.

   - SUNRPC tracepoints.

     Start the process of adding tracepoints in order to improve
     debugging of the RPC layer.

   - pNFS object layout support for autologin.

  Important bugfixes include:

   - Fix a bug in rpc_wake_up/rpc_wake_up_status that caused them to
     fail to wake up all tasks when applied to priority waitqueues.

   - Ensure that we handle read delegations correctly, when we try to
     truncate a file.

   - A number of fixes for NFSv4 state manager loops (mostly to do with
     delegation recovery)."

* tag 'nfs-for-3.4-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (224 commits)
  NFS: fix sb->s_id in nfs debug prints
  xprtrdma: Remove assumption that each segment is <= PAGE_SIZE
  xprtrdma: The transport should not bug-check when a dup reply is received
  pnfs-obj: autologin: Add support for protocol autologin
  NFS: Remove nfs4_setup_sequence from generic rename code
  NFS: Remove nfs4_setup_sequence from generic unlink code
  NFS: Remove nfs4_setup_sequence from generic read code
  NFS: Remove nfs4_setup_sequence from generic write code
  NFS: Fix more NFS debug related build warnings
  SUNRPC/LOCKD: Fix build warnings when CONFIG_SUNRPC_DEBUG is undefined
  nfs: non void functions must return a value
  SUNRPC: Kill compiler warning when RPC_DEBUG is unset
  SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG
  NFS: Use cond_resched_lock() to reduce latencies in the commit scans
  NFSv4: It is not safe to dereference lsp->ls_state in release_lockowner
  NFS: ncommit count is being double decremented
  SUNRPC: We must not use list_for_each_entry_safe() in rpc_wake_up()
  Try using machine credentials for RENEW calls
  NFSv4.1: Fix a few issues in filelayout_commit_pagelist
  NFSv4.1: Clean ups and bugfixes for the pNFS read/writeback/commit code
  ...

Documentation/filesystems/nfs/idmapper.txt

@@ -4,13 +4,21 @@ ID Mapper
 =========
 Id mapper is used by NFS to translate user and group ids into names, and to
 translate user and group names into ids.  Part of this translation involves
-performing an upcall to userspace to request the information.  Id mapper will
-user request-key to perform this upcall and cache the result.  The program
-/usr/sbin/nfs.idmap should be called by request-key, and will perform the
-translation and initialize a key with the resulting information.
+performing an upcall to userspace to request the information.  There are two
+ways NFS could obtain this information: placing a call to /sbin/request-key
+or by placing a call to the rpc.idmap daemon.
+
+NFS will attempt to call /sbin/request-key first.  If this succeeds, the
+result will be cached using the generic request-key cache.  This call should
+only fail if /etc/request-key.conf is not configured for the id_resolver key
+type, see the "Configuring" section below if you wish to use the request-key
+method.
+
+If the call to /sbin/request-key fails (if /etc/request-key.conf is not
+configured with the id_resolver key type), then the idmapper will ask the
+legacy rpc.idmap daemon for the id mapping.  This result will be stored
+in a custom NFS idmap cache.
 
- NFS_USE_NEW_IDMAPPER must be selected when configuring the kernel to use this
- feature.
 
 ===========
 Configuring

Documentation/filesystems/nfs/pnfs.txt

@@ -53,3 +53,57 @@ lseg maintains an extra reference corresponding to the NFS_LSEG_VALID
 bit which holds it in the pnfs_layout_hdr's list.  When the final lseg
 is removed from the pnfs_layout_hdr's list, the NFS_LAYOUT_DESTROYED
 bit is set, preventing any new lsegs from being added.
+
+layout drivers
+--------------
+
+PNFS utilizes what is called layout drivers. The STD defines 3 basic
+layout types: "files" "objects" and "blocks". For each of these types
+there is a layout-driver with a common function-vectors table which
+are called by the nfs-client pnfs-core to implement the different layout
+types.
+
+Files-layout-driver code is in: fs/nfs/nfs4filelayout.c && nfs4filelayoutdev.c
+Objects-layout-deriver code is in: fs/nfs/objlayout/.. directory
+Blocks-layout-deriver code is in: fs/nfs/blocklayout/.. directory
+
+objects-layout setup
+--------------------
+
+As part of the full STD implementation the objlayoutdriver.ko needs, at times,
+to automatically login to yet undiscovered iscsi/osd devices. For this the
+driver makes up-calles to a user-mode script called *osd_login*
+
+The path_name of the script to use is by default:
+	/sbin/osd_login.
+This name can be overridden by the Kernel module parameter:
+	objlayoutdriver.osd_login_prog
+
+If Kernel does not find the osd_login_prog path it will zero it out
+and will not attempt farther logins. An admin can then write new value
+to the objlayoutdriver.osd_login_prog Kernel parameter to re-enable it.
+
+The /sbin/osd_login is part of the nfs-utils package, and should usually
+be installed on distributions that support this Kernel version.
+
+The API to the login script is as follows:
+	Usage: $0 -u <URI> -o <OSDNAME> -s <SYSTEMID>
+	Options:
+		-u		target uri e.g. iscsi://<ip>:<port>
+				(allways exists)
+				(More protocols can be defined in the future.
+				 The client does not interpret this string it is
+				 passed unchanged as recieved from the Server)
+		-o		osdname of the requested target OSD
+				(Might be empty)
+				(A string which denotes the OSD name, there is a
+				 limit of 64 chars on this string)
+		-s 		systemid of the requested target OSD
+				(Might be empty)
+				(This string, if not empty is always an hex
+				 representation of the 20 bytes osd_system_id)
+
+blocks-layout setup
+-------------------
+
+TODO: Document the setup needs of the blocks layout driver

Documentation/kernel-parameters.txt

@@ -1672,6 +1672,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			of returning the full 64-bit number.
 			The default is to return 64-bit inode numbers.
 
+	nfs.max_session_slots=
+			[NFSv4.1] Sets the maximum number of session slots
+			the client will attempt to negotiate with the server.
+			This limits the number of simultaneous RPC requests
+			that the client can send to the NFSv4.1 server.
+			Note that there is little point in setting this
+			value higher than the max_tcp_slot_table_limit.
+
 	nfs.nfs4_disable_idmapping=
 			[NFSv4] When set to the default of '1', this option
 			ensures that both the RPC level authentication
@@ -1685,6 +1693,21 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			back to using the idmapper.
 			To turn off this behaviour, set the value to '0'.
 
+	nfs.send_implementation_id =
+			[NFSv4.1] Send client implementation identification
+			information in exchange_id requests.
+			If zero, no implementation identification information
+			will be sent.
+			The default is to send the implementation identification
+			information.
+
+
+	objlayoutdriver.osd_login_prog=
+			[NFS] [OBJLAYOUT] sets the pathname to the program which
+			is used to automatically discover and login into new
+			osd-targets. Please see:
+			Documentation/filesystems/pnfs.txt for more explanations
+
 	nmi_debug=	[KNL,AVR32,SH] Specify one or more actions to take
 			when a NMI is triggered.
 			Format: [state][,regs][,debounce][,die]

fs/lockd/clnt4xdr.c

@@ -598,7 +598,7 @@ static struct rpc_procinfo	nlm4_procedures[] = {
 	PROC(GRANTED_RES,	res,		norep),
 };
 
-struct rpc_version	nlm_version4 = {
+const struct rpc_version nlm_version4 = {
 	.number		= 4,
 	.nrprocs	= ARRAY_SIZE(nlm4_procedures),
 	.procs		= nlm4_procedures,

fs/lockd/clntlock.c

@@ -62,7 +62,8 @@ struct nlm_host *nlmclnt_init(const struct nlmclnt_initdata *nlm_init)
 
 	host = nlmclnt_lookup_host(nlm_init->address, nlm_init->addrlen,
 				   nlm_init->protocol, nlm_version,
-				   nlm_init->hostname, nlm_init->noresvport);
+				   nlm_init->hostname, nlm_init->noresvport,
+				   nlm_init->net);
 	if (host == NULL) {
 		lockd_down();
 		return ERR_PTR(-ENOLCK);

fs/lockd/clntxdr.c

@@ -596,19 +596,19 @@ static struct rpc_procinfo	nlm_procedures[] = {
 	PROC(GRANTED_RES,	res,		norep),
 };
 
-static struct rpc_version	nlm_version1 = {
+static const struct rpc_version	nlm_version1 = {
 		.number		= 1,
 		.nrprocs	= ARRAY_SIZE(nlm_procedures),
 		.procs		= nlm_procedures,
 };
 
-static struct rpc_version	nlm_version3 = {
+static const struct rpc_version	nlm_version3 = {
 		.number		= 3,
 		.nrprocs	= ARRAY_SIZE(nlm_procedures),
 		.procs		= nlm_procedures,
 };
 
-static struct rpc_version	*nlm_versions[] = {
+static const struct rpc_version	*nlm_versions[] = {
 	[1] = &nlm_version1,
 	[3] = &nlm_version3,
 #ifdef CONFIG_LOCKD_V4
@@ -618,7 +618,7 @@ static struct rpc_version	*nlm_versions[] = {
 
 static struct rpc_stat		nlm_rpc_stats;
 
-struct rpc_program		nlm_program = {
+const struct rpc_program	nlm_program = {
 		.name		= "lockd",
 		.number		= NLM_PROGRAM,
 		.nrvers		= ARRAY_SIZE(nlm_versions),

fs/lockd/host.c

@@ -17,6 +17,8 @@
 #include <linux/lockd/lockd.h>
 #include <linux/mutex.h>
 
+#include <linux/sunrpc/svc_xprt.h>
+
 #include <net/ipv6.h>
 
 #define NLMDBG_FACILITY		NLMDBG_HOSTCACHE
@@ -54,6 +56,7 @@ struct nlm_lookup_host_info {
 	const char		*hostname;	/* remote's hostname */
 	const size_t		hostname_len;	/* it's length */
 	const int		noresvport;	/* use non-priv port */
+	struct net		*net;		/* network namespace to bind */
 };
 
 /*
@@ -155,6 +158,7 @@ static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni,
 	INIT_LIST_HEAD(&host->h_reclaim);
 	host->h_nsmhandle  = nsm;
 	host->h_addrbuf    = nsm->sm_addrbuf;
+	host->net	   = ni->net;
 
 out:
 	return host;
@@ -206,7 +210,8 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
 				     const unsigned short protocol,
 				     const u32 version,
 				     const char *hostname,
-				     int noresvport)
+				     int noresvport,
+				     struct net *net)
 {
 	struct nlm_lookup_host_info ni = {
 		.server		= 0,
@@ -217,6 +222,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
 		.hostname	= hostname,
 		.hostname_len	= strlen(hostname),
 		.noresvport	= noresvport,
+		.net		= net,
 	};
 	struct hlist_head *chain;
 	struct hlist_node *pos;
@@ -231,6 +237,8 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
 
 	chain = &nlm_client_hosts[nlm_hash_address(sap)];
 	hlist_for_each_entry(host, pos, chain, h_hash) {
+		if (host->net != net)
+			continue;
 		if (!rpc_cmp_addr(nlm_addr(host), sap))
 			continue;
 
@@ -318,6 +326,7 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 	struct nsm_handle *nsm = NULL;
 	struct sockaddr *src_sap = svc_daddr(rqstp);
 	size_t src_len = rqstp->rq_daddrlen;
+	struct net *net = rqstp->rq_xprt->xpt_net;
 	struct nlm_lookup_host_info ni = {
 		.server		= 1,
 		.sap		= svc_addr(rqstp),
@@ -326,6 +335,7 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 		.version	= rqstp->rq_vers,
 		.hostname	= hostname,
 		.hostname_len	= hostname_len,
+		.net		= net,
 	};
 
 	dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
@@ -339,6 +349,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 
 	chain = &nlm_server_hosts[nlm_hash_address(ni.sap)];
 	hlist_for_each_entry(host, pos, chain, h_hash) {
+		if (host->net != net)
+			continue;
 		if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
 			continue;
 
@@ -431,7 +443,7 @@ nlm_bind_host(struct nlm_host *host)
 			.to_retries	= 5U,
 		};
 		struct rpc_create_args args = {
-			.net		= &init_net,
+			.net		= host->net,
 			.protocol	= host->h_proto,
 			.address	= nlm_addr(host),
 			.addrsize	= host->h_addrlen,
@@ -553,12 +565,8 @@ void nlm_host_rebooted(const struct nlm_reboot *info)
 	nsm_release(nsm);
 }
 
-/*
- * Shut down the hosts module.
- * Note that this routine is called only at server shutdown time.
- */
 void
-nlm_shutdown_hosts(void)
+nlm_shutdown_hosts_net(struct net *net)
 {
 	struct hlist_head *chain;
 	struct hlist_node *pos;
@@ -570,6 +578,8 @@ nlm_shutdown_hosts(void)
 	/* First, make all hosts eligible for gc */
 	dprintk("lockd: nuking all hosts...\n");
 	for_each_host(host, pos, chain, nlm_server_hosts) {
+		if (net && host->net != net)
+			continue;
 		host->h_expires = jiffies - 1;
 		if (host->h_rpcclnt) {
 			rpc_shutdown_client(host->h_rpcclnt);
@@ -580,15 +590,29 @@ nlm_shutdown_hosts(void)
 	/* Then, perform a garbage collection pass */
 	nlm_gc_hosts();
 	mutex_unlock(&nlm_host_mutex);
+}
+
+/*
+ * Shut down the hosts module.
+ * Note that this routine is called only at server shutdown time.
+ */
+void
+nlm_shutdown_hosts(void)
+{
+	struct hlist_head *chain;
+	struct hlist_node *pos;
+	struct nlm_host	*host;
+
+	nlm_shutdown_hosts_net(NULL);
 
 	/* complain if any hosts are left */
 	if (nrhosts != 0) {
 		printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
 		dprintk("lockd: %lu hosts left:\n", nrhosts);
 		for_each_host(host, pos, chain, nlm_server_hosts) {
-			dprintk("       %s (cnt %d use %d exp %ld)\n",
+			dprintk("       %s (cnt %d use %d exp %ld net %p)\n",
 				host->h_name, atomic_read(&host->h_count),
-				host->h_inuse, host->h_expires);
+				host->h_inuse, host->h_expires, host->net);
 		}
 	}
 }