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Message-ID: <20101220143703.GB20643@fieldses.org>
Date: Mon, 20 Dec 2010 09:37:03 -0500
From: "J. Bruce Fields" <bfields@...ldses.org>
To: "Kirill A. Shutsemov" <kirill@...temov.name>
Cc: Trond Myklebust <Trond.Myklebust@...app.com>,
Neil Brown <neilb@...e.de>,
Pavel Emelyanov <xemul@...allels.com>,
linux-nfs@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/12] nfs: introduce mount option 'rpcmount'
On Mon, Dec 20, 2010 at 01:54:37PM +0200, Kirill A. Shutsemov wrote:
> From: Kirill A. Shutemov <kirill@...temov.name>
>
> It specifies rpc_pipefs to use. init_rpc_pipefs, by default.
You also need to export get_rpc_pipefs() for the nfs module to use.
--b.
>
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
> ---
> fs/nfs/callback.c | 6 ++--
> fs/nfs/callback.h | 3 +-
> fs/nfs/client.c | 46 ++++++++++++++++++++++++++++++++++++--------
> fs/nfs/internal.h | 10 +++++++-
> fs/nfs/mount_clnt.c | 3 +-
> fs/nfs/namespace.c | 3 +-
> fs/nfs/nfs4namespace.c | 22 +++++++++++---------
> fs/nfs/super.c | 20 +++++++++++++++++++
> include/linux/nfs_fs_sb.h | 1 +
> 9 files changed, 86 insertions(+), 28 deletions(-)
>
> diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
> index bef6abd..ef6d206 100644
> --- a/fs/nfs/callback.c
> +++ b/fs/nfs/callback.c
> @@ -16,7 +16,6 @@
> #include <linux/freezer.h>
> #include <linux/kthread.h>
> #include <linux/sunrpc/svcauth_gss.h>
> -#include <linux/sunrpc/rpc_pipe_fs.h>
> #if defined(CONFIG_NFS_V4_1)
> #include <linux/sunrpc/bc_xprt.h>
> #endif
> @@ -239,7 +238,8 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
> /*
> * Bring up the callback thread if it is not already up.
> */
> -int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
> +int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt,
> + struct vfsmount *rpcmount)
> {
> struct svc_serv *serv = NULL;
> struct svc_rqst *rqstp;
> @@ -254,7 +254,7 @@ int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt)
> nfs_callback_bc_serv(minorversion, xprt, cb_info);
> goto out;
> }
> - serv = svc_create(&nfs4_callback_program, init_rpc_pipefs,
> + serv = svc_create(&nfs4_callback_program, rpcmount,
> NFS4_CALLBACK_BUFSIZE, NULL);
> if (!serv) {
> ret = -ENOMEM;
> diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
> index 85a7cfd..ae27385 100644
> --- a/fs/nfs/callback.h
> +++ b/fs/nfs/callback.h
> @@ -133,7 +133,8 @@ extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getat
> extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
>
> #ifdef CONFIG_NFS_V4
> -extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
> +extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt,
> + struct vfsmount *rpcmount);
> extern void nfs_callback_down(int minorversion);
> extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
> const nfs4_stateid *stateid);
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index fbc013d..ccc400a 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -107,6 +107,7 @@ struct nfs_client_initdata {
> const struct nfs_rpc_ops *rpc_ops;
> int proto;
> u32 minorversion;
> + struct vfsmount *rpcmount;
> };
>
> /*
> @@ -143,6 +144,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
> clp->cl_rpcclient = ERR_PTR(-EINVAL);
>
> clp->cl_proto = cl_init->proto;
> + clp->cl_rpcmount = mntget(cl_init->rpcmount);
>
> #ifdef CONFIG_NFS_V4
> INIT_LIST_HEAD(&clp->cl_delegations);
> @@ -231,6 +233,7 @@ static void nfs_free_client(struct nfs_client *clp)
> if (clp->cl_machine_cred != NULL)
> put_rpccred(clp->cl_machine_cred);
>
> + mntput(clp->cl_rpcmount);
> kfree(clp->cl_hostname);
> kfree(clp);
>
> @@ -457,6 +460,9 @@ static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *dat
> /* Match the full socket address */
> if (!nfs_sockaddr_cmp(sap, clap))
> continue;
> + /* Match rpc_pipefs mount point */
> + if (clp->cl_rpcmount->mnt_sb != data->rpcmount->mnt_sb)
> + continue;
>
> atomic_inc(&clp->cl_count);
> return clp;
> @@ -615,7 +621,7 @@ static int nfs_create_rpc_client(struct nfs_client *clp,
> .program = &nfs_program,
> .version = clp->rpc_ops->version,
> .authflavor = flavor,
> - .rpcmount = init_rpc_pipefs,
> + .rpcmount = clp->cl_rpcmount,
> };
>
> if (discrtry)
> @@ -650,7 +656,7 @@ static void nfs_destroy_server(struct nfs_server *server)
> /*
> * Version 2 or 3 lockd setup
> */
> -static int nfs_start_lockd(struct nfs_server *server)
> +static int nfs_start_lockd(struct nfs_server *server, struct vfsmount *rpcmount)
> {
> struct nlm_host *host;
> struct nfs_client *clp = server->nfs_client;
> @@ -661,7 +667,7 @@ static int nfs_start_lockd(struct nfs_server *server)
> .nfs_version = clp->rpc_ops->version,
> .noresvport = server->flags & NFS_MOUNT_NORESVPORT ?
> 1 : 0,
> - .rpcmount = init_rpc_pipefs,
> + .rpcmount = rpcmount,
> };
>
> if (nlm_init.nfs_version > 3)
> @@ -809,8 +815,16 @@ static int nfs_init_server(struct nfs_server *server,
> cl_init.rpc_ops = &nfs_v3_clientops;
> #endif
>
> + cl_init.rpcmount = get_rpc_pipefs(data->rpcmount);
> + if (IS_ERR(cl_init.rpcmount)) {
> + dprintk("<-- nfs_init_server() = error %ld\n",
> + PTR_ERR(cl_init.rpcmount));
> + return PTR_ERR(cl_init.rpcmount);
> + }
> +
> /* Allocate or find a client reference we can use */
> clp = nfs_get_client(&cl_init);
> + mntput(cl_init.rpcmount);
> if (IS_ERR(clp)) {
> dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
> return PTR_ERR(clp);
> @@ -842,7 +856,7 @@ static int nfs_init_server(struct nfs_server *server,
> server->acdirmax = data->acdirmax * HZ;
>
> /* Start lockd here, before we might error out */
> - error = nfs_start_lockd(server);
> + error = nfs_start_lockd(server, clp->cl_rpcmount);
> if (error < 0)
> goto error;
>
> @@ -1144,7 +1158,8 @@ static int nfs4_init_callback(struct nfs_client *clp)
> }
>
> error = nfs_callback_up(clp->cl_mvops->minor_version,
> - clp->cl_rpcclient->cl_xprt);
> + clp->cl_rpcclient->cl_xprt,
> + clp->cl_rpcmount);
> if (error < 0) {
> dprintk("%s: failed to start callback. Error = %d\n",
> __func__, error);
> @@ -1244,7 +1259,8 @@ static int nfs4_set_client(struct nfs_server *server,
> const char *ip_addr,
> rpc_authflavor_t authflavour,
> int proto, const struct rpc_timeout *timeparms,
> - u32 minorversion)
> + u32 minorversion,
> + struct vfsmount *rpcmount)
> {
> struct nfs_client_initdata cl_init = {
> .hostname = hostname,
> @@ -1253,6 +1269,7 @@ static int nfs4_set_client(struct nfs_server *server,
> .rpc_ops = &nfs_v4_clientops,
> .proto = proto,
> .minorversion = minorversion,
> + .rpcmount = rpcmount,
> };
> struct nfs_client *clp;
> int error;
> @@ -1363,6 +1380,7 @@ static int nfs4_init_server(struct nfs_server *server,
> const struct nfs_parsed_mount_data *data)
> {
> struct rpc_timeout timeparms;
> + struct vfsmount *rpcmount;
> int error;
>
> dprintk("--> nfs4_init_server()\n");
> @@ -1377,6 +1395,11 @@ static int nfs4_init_server(struct nfs_server *server,
> server->caps |= NFS_CAP_READDIRPLUS;
> server->options = data->options;
>
> + rpcmount = get_rpc_pipefs(data->rpcmount);
> + if (IS_ERR(rpcmount)) {
> + error = PTR_ERR(rpcmount);
> + goto error;
> + }
> /* Get a client record */
> error = nfs4_set_client(server,
> data->nfs_server.hostname,
> @@ -1386,7 +1409,9 @@ static int nfs4_init_server(struct nfs_server *server,
> data->auth_flavors[0],
> data->nfs_server.protocol,
> &timeparms,
> - data->minorversion);
> + data->minorversion,
> + rpcmount);
> + mntput(rpcmount);
> if (error < 0)
> goto error;
>
> @@ -1476,7 +1501,10 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
> data->authflavor,
> parent_server->client->cl_xprt->prot,
> parent_server->client->cl_timeout,
> - parent_client->cl_mvops->minor_version);
> + parent_client->cl_mvops->minor_version,
> + parent_client->cl_rpcmount);
> +
> +
> if (error < 0)
> goto error;
>
> @@ -1550,7 +1578,7 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
> (unsigned long long) server->fsid.major,
> (unsigned long long) server->fsid.minor);
>
> - error = nfs_start_lockd(server);
> + error = nfs_start_lockd(server, server->nfs_client->cl_rpcmount);
> if (error < 0)
> goto out_free_server;
>
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index e6356b7..cb31fd9 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -86,6 +86,7 @@ struct nfs_parsed_mount_data {
> unsigned int version;
> unsigned int minorversion;
> char *fscache_uniq;
> + char *rpcmount;
>
> struct {
> struct sockaddr_storage address;
> @@ -120,6 +121,7 @@ struct nfs_mount_request {
> int noresvport;
> unsigned int *auth_flav_len;
> rpc_authflavor_t *auth_flavs;
> + struct vfsmount *rpcmount;
> };
>
> extern int nfs_mount(struct nfs_mount_request *info);
> @@ -160,10 +162,14 @@ static inline void nfs_fs_proc_exit(void)
>
> /* nfs4namespace.c */
> #ifdef CONFIG_NFS_V4
> -extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
> +extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent,
> + struct dentry *dentry,
> + struct vfsmount *rpcmount);
> #else
> static inline
> -struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
> +struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent,
> + struct dentry *dentry,
> + struct vfsmount *rpcmount)
> {
> return ERR_PTR(-ENOENT);
> }
> diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
> index 67b4b8d..9fd4157 100644
> --- a/fs/nfs/mount_clnt.c
> +++ b/fs/nfs/mount_clnt.c
> @@ -13,7 +13,6 @@
> #include <linux/in.h>
> #include <linux/sunrpc/clnt.h>
> #include <linux/sunrpc/sched.h>
> -#include <linux/sunrpc/rpc_pipe_fs.h>
> #include <linux/nfs_fs.h>
> #include "internal.h"
>
> @@ -162,7 +161,7 @@ int nfs_mount(struct nfs_mount_request *info)
> .program = &mnt_program,
> .version = info->version,
> .authflavor = RPC_AUTH_UNIX,
> - .rpcmount = init_rpc_pipefs,
> + .rpcmount = info->rpcmount,
> };
> struct rpc_clnt *mnt_clnt;
> int status;
> diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
> index db6aa36..d47f6f5 100644
> --- a/fs/nfs/namespace.c
> +++ b/fs/nfs/namespace.c
> @@ -135,7 +135,8 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
> goto out_err;
>
> if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
> - mnt = nfs_do_refmount(nd->path.mnt, nd->path.dentry);
> + mnt = nfs_do_refmount(nd->path.mnt, nd->path.dentry,
> + server->nfs_client->cl_rpcmount);
> else
> mnt = nfs_do_submount(nd->path.mnt, nd->path.dentry, fh,
> fattr);
> diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
> index 7a61fdb..92d5d63 100644
> --- a/fs/nfs/nfs4namespace.c
> +++ b/fs/nfs/nfs4namespace.c
> @@ -14,7 +14,6 @@
> #include <linux/slab.h>
> #include <linux/string.h>
> #include <linux/sunrpc/clnt.h>
> -#include <linux/sunrpc/rpc_pipe_fs.h>
> #include <linux/vfs.h>
> #include <linux/inet.h>
> #include "internal.h"
> @@ -99,14 +98,13 @@ static int nfs4_validate_fspath(const struct vfsmount *mnt_parent,
> }
>
> static size_t nfs_parse_server_name(char *string, size_t len,
> - struct sockaddr *sa, size_t salen)
> + struct sockaddr *sa, size_t salen, struct vfsmount *rpcmount)
> {
> ssize_t ret;
>
> ret = rpc_pton(string, len, sa, salen);
> if (ret == 0) {
> - ret = nfs_dns_resolve_name(string, len, sa, salen,
> - init_rpc_pipefs);
> + ret = nfs_dns_resolve_name(string, len, sa, salen, rpcmount);
> if (ret < 0)
> ret = 0;
> }
> @@ -115,7 +113,8 @@ static size_t nfs_parse_server_name(char *string, size_t len,
>
> static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
> char *page, char *page2,
> - const struct nfs4_fs_location *location)
> + const struct nfs4_fs_location *location,
> + struct vfsmount *rpcmount)
> {
> const size_t addr_bufsize = sizeof(struct sockaddr_storage);
> struct vfsmount *mnt = ERR_PTR(-ENOENT);
> @@ -143,7 +142,7 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
> continue;
>
> mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len,
> - mountdata->addr, addr_bufsize);
> + mountdata->addr, addr_bufsize, rpcmount);
> if (mountdata->addrlen == 0)
> continue;
>
> @@ -174,7 +173,8 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
> */
> static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
> const struct dentry *dentry,
> - const struct nfs4_fs_locations *locations)
> + const struct nfs4_fs_locations *locations,
> + struct vfsmount *rpcmount)
> {
> struct vfsmount *mnt = ERR_PTR(-ENOENT);
> struct nfs_clone_mount mountdata = {
> @@ -213,7 +213,7 @@ static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
> location->rootpath.ncomponents == 0)
> continue;
>
> - mnt = try_location(&mountdata, page, page2, location);
> + mnt = try_location(&mountdata, page, page2, location, rpcmount);
> if (!IS_ERR(mnt))
> break;
> }
> @@ -231,7 +231,9 @@ out:
> * @dentry - dentry of referral
> *
> */
> -struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
> +struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent,
> + struct dentry *dentry,
> + struct vfsmount *rpcmount)
> {
> struct vfsmount *mnt = ERR_PTR(-ENOMEM);
> struct dentry *parent;
> @@ -264,7 +266,7 @@ struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentr
> fs_locations->fs_path.ncomponents <= 0)
> goto out_free;
>
> - mnt = nfs_follow_referral(mnt_parent, dentry, fs_locations);
> + mnt = nfs_follow_referral(mnt_parent, dentry, fs_locations, rpcmount);
> out_free:
> __free_page(page);
> kfree(fs_locations);
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index 4100630..32b7e35 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -35,6 +35,7 @@
> #include <linux/sunrpc/metrics.h>
> #include <linux/sunrpc/xprtsock.h>
> #include <linux/sunrpc/xprtrdma.h>
> +#include <linux/sunrpc/rpc_pipe_fs.h>
> #include <linux/nfs_fs.h>
> #include <linux/nfs_mount.h>
> #include <linux/nfs4_mount.h>
> @@ -106,6 +107,7 @@ enum {
> Opt_lookupcache,
> Opt_fscache_uniq,
> Opt_local_lock,
> + Opt_rpcmount,
>
> /* Special mount options */
> Opt_userspace, Opt_deprecated, Opt_sloppy,
> @@ -178,6 +180,7 @@ static const match_table_t nfs_mount_option_tokens = {
> { Opt_lookupcache, "lookupcache=%s" },
> { Opt_fscache_uniq, "fsc=%s" },
> { Opt_local_lock, "local_lock=%s" },
> + { Opt_rpcmount, "rpcmount=%s" },
>
> { Opt_err, NULL }
> };
> @@ -1484,6 +1487,13 @@ static int nfs_parse_mount_options(char *raw,
> return 0;
> };
> break;
> + case Opt_rpcmount:
> + string = match_strdup(args);
> + if (string == NULL)
> + goto out_nomem;
> + kfree(mnt->rpcmount);
> + mnt->rpcmount = string;
> + break;
>
> /*
> * Special options
> @@ -1644,11 +1654,19 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
> request.salen = args->mount_server.addrlen;
> nfs_set_port(request.sap, &args->mount_server.port, 0);
>
> + request.rpcmount = get_rpc_pipefs(args->rpcmount);
> + if (IS_ERR(request.rpcmount)) {
> + dfprintk(MOUNT, "NFS: unable get rpc_pipefs mount point, "
> + "error %ld\n", PTR_ERR(request.rpcmount));
> + return PTR_ERR(request.rpcmount);
> + }
> +
> /*
> * Now ask the mount server to map our export path
> * to a file handle.
> */
> status = nfs_mount(&request);
> + mntput(request.rpcmount);
> if (status != 0) {
> dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
> request.hostname, status);
> @@ -2352,6 +2370,7 @@ out:
> kfree(data->nfs_server.hostname);
> kfree(data->mount_server.hostname);
> kfree(data->fscache_uniq);
> + kfree(data->rpcmount);
> security_free_mnt_opts(&data->lsm_opts);
> out_free_fh:
> nfs_free_fhandle(mntfh);
> @@ -2947,6 +2966,7 @@ out:
> kfree(data->nfs_server.export_path);
> kfree(data->nfs_server.hostname);
> kfree(data->fscache_uniq);
> + kfree(data->rpcmount);
> out_free_data:
> kfree(data);
> dprintk("<-- nfs4_get_sb() = %d%s\n", error,
> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
> index 452d964..ee417c9 100644
> --- a/include/linux/nfs_fs_sb.h
> +++ b/include/linux/nfs_fs_sb.h
> @@ -36,6 +36,7 @@ struct nfs_client {
> struct list_head cl_share_link; /* link in global client list */
> struct list_head cl_superblocks; /* List of nfs_server structs */
>
> + struct vfsmount *cl_rpcmount; /* rpc_pipefs mount point */
> struct rpc_clnt * cl_rpcclient;
> const struct nfs_rpc_ops *rpc_ops; /* NFS protocol vector */
> int cl_proto; /* Network transport protocol */
> --
> 1.7.3.4
>
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