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Subject[PATCH 17/24] NFS: Configuration and mount option changes to enable local caching on NFS
Date
Changes to the kernel configuration defintions and to the NFS mount options to
allow the local caching support added by the previous patch to be enabled.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/Kconfig | 8 ++++++++
fs/nfs/client.c | 14 ++++++++++----
fs/nfs/internal.h | 2 ++
fs/nfs/super.c | 40 ++++++++++++++++++++++++++++++++++------
4 files changed, 54 insertions(+), 10 deletions(-)

diff --git a/fs/Kconfig b/fs/Kconfig
index 8ae7eda..ebc7341 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1597,6 +1597,14 @@ config NFS_V4

If unsure, say N.

+config NFS_FSCACHE
+ bool "Provide NFS client caching support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
+ help
+ Say Y here if you want NFS data to be cached locally on disc through
+ the general filesystem cache manager
+
config NFS_DIRECTIO
bool "Allow direct I/O on NFS files"
depends on NFS_FS
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index f1783b2..0de4db4 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -543,7 +543,8 @@ error:
/*
* Create a version 2 or 3 client
*/
-static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data)
+static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data,
+ unsigned int extra_options)
{
struct nfs_client *clp;
int error, nfsvers = 2;
@@ -580,6 +581,7 @@ static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_dat
server->acregmax = data->acregmax * HZ;
server->acdirmin = data->acdirmin * HZ;
server->acdirmax = data->acdirmax * HZ;
+ server->options = extra_options;

/* Start lockd here, before we might error out */
error = nfs_start_lockd(server);
@@ -776,6 +778,7 @@ void nfs_free_server(struct nfs_server *server)
* - keyed on server and FSID
*/
struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
+ unsigned extra_options,
struct nfs_fh *mntfh)
{
struct nfs_server *server;
@@ -787,7 +790,7 @@ struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
return ERR_PTR(-ENOMEM);

/* Get a client representation */
- error = nfs_init_server(server, data);
+ error = nfs_init_server(server, data, extra_options);
if (error < 0)
goto error;

@@ -911,7 +914,8 @@ error:
* Create a version 4 volume record
*/
static int nfs4_init_server(struct nfs_server *server,
- const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
+ const struct nfs4_mount_data *data, rpc_authflavor_t authflavour,
+ unsigned int extra_options)
{
int error;

@@ -930,6 +934,7 @@ static int nfs4_init_server(struct nfs_server *server,
server->acregmax = data->acregmax * HZ;
server->acdirmin = data->acdirmin * HZ;
server->acdirmax = data->acdirmax * HZ;
+ server->options = extra_options;

error = nfs_init_server_rpcclient(server, authflavour);

@@ -948,6 +953,7 @@ struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
const char *mntpath,
const char *ip_addr,
rpc_authflavor_t authflavour,
+ unsigned int extra_options,
struct nfs_fh *mntfh)
{
struct nfs_fattr fattr;
@@ -967,7 +973,7 @@ struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
goto error;

/* set up the general RPC client */
- error = nfs4_init_server(server, data, authflavour);
+ error = nfs4_init_server(server, data, authflavour, extra_options);
if (error < 0)
goto error;

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 76cf55d..34ef000 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -33,6 +33,7 @@ extern struct rpc_program nfs_program;
extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
+ unsigned int,
struct nfs_fh *);
extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
const char *,
@@ -40,6 +41,7 @@ extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
const char *,
const char *,
rpc_authflavor_t,
+ unsigned int,
struct nfs_fh *);
extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
struct nfs_fh *);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index b878528..7753e9e 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -67,6 +67,7 @@ struct nfs_parsed_mount_data {
acdirmin, acdirmax;
int namlen;
unsigned int bsize;
+ unsigned int options;
unsigned int auth_flavor_len;
rpc_authflavor_t auth_flavors[1];
char *client_address;
@@ -101,6 +102,7 @@ enum {
Opt_acl, Opt_noacl,
Opt_rdirplus, Opt_nordirplus,
Opt_sharecache, Opt_nosharecache,
+ Opt_fscache, Opt_nofscache,

/* Mount options that take integer arguments */
Opt_port,
@@ -149,6 +151,8 @@ static match_table_t nfs_mount_option_tokens = {
{ Opt_nordirplus, "nordirplus" },
{ Opt_sharecache, "sharecache" },
{ Opt_nosharecache, "nosharecache" },
+ { Opt_fscache, "fsc" },
+ { Opt_nofscache, "nofsc" },

{ Opt_port, "port=%u" },
{ Opt_rsize, "rsize=%u" },
@@ -495,6 +499,8 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
seq_printf(m, ",retrans=%u", clp->retrans_count);
seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
+ if (nfss->options & NFS_OPTION_FSCACHE)
+ seq_printf(m, ",fsc");
}

/*
@@ -725,6 +731,15 @@ static int nfs_parse_mount_options(char *raw,
break;
case Opt_nosharecache:
mnt->flags |= NFS_MOUNT_UNSHARED;
+ mnt->options &= ~NFS_OPTION_FSCACHE;
+ break;
+ case Opt_fscache:
+ /* sharing is mandatory with fscache */
+ mnt->options |= NFS_OPTION_FSCACHE;
+ mnt->flags &= ~NFS_MOUNT_UNSHARED;
+ break;
+ case Opt_nofscache:
+ mnt->options &= ~NFS_OPTION_FSCACHE;
break;

case Opt_port:
@@ -1081,10 +1096,13 @@ out_err:
*/
static int nfs_validate_mount_data(struct nfs_mount_data **options,
struct nfs_fh *mntfh,
- const char *dev_name)
+ const char *dev_name,
+ unsigned int *_extra_options)
{
struct nfs_mount_data *data = *options;

+ *_extra_options = 0;
+
if (data == NULL)
goto out_no_data;

@@ -1131,6 +1149,7 @@ static int nfs_validate_mount_data(struct nfs_mount_data **options,
.acregmax = 60,
.acdirmin = 30,
.acdirmax = 60,
+ .options = 0,
.mount_server.protocol = IPPROTO_UDP,
.mount_server.program = NFS_MNT_PROGRAM,
.nfs_server.protocol = IPPROTO_TCP,
@@ -1139,6 +1158,7 @@ static int nfs_validate_mount_data(struct nfs_mount_data **options,

if (nfs_parse_mount_options((char *) *options, &args) == 0)
return -EINVAL;
+ *_extra_options = args.options;

data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
@@ -1381,6 +1401,7 @@ static int nfs_get_sb(struct file_system_type *fs_type,
struct nfs_fh mntfh;
struct nfs_mount_data *data = raw_data;
struct dentry *mntroot;
+ unsigned int extra_options;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
@@ -1388,12 +1409,12 @@ static int nfs_get_sb(struct file_system_type *fs_type,
int error;

/* Validate the mount data */
- error = nfs_validate_mount_data(&data, &mntfh, dev_name);
+ error = nfs_validate_mount_data(&data, &mntfh, dev_name, &extra_options);
if (error < 0)
goto out;

/* Get a volume representation */
- server = nfs_create_server(data, &mntfh);
+ server = nfs_create_server(data, extra_options, &mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
@@ -1565,11 +1586,14 @@ static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
rpc_authflavor_t *authflavour,
char **hostname,
char **mntpath,
- char **ip_addr)
+ char **ip_addr,
+ unsigned int *_extra_options)
{
struct nfs4_mount_data *data = *options;
char *c;

+ *_extra_options = 0;
+
if (data == NULL)
goto out_no_data;

@@ -1625,11 +1649,13 @@ static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
.acregmax = 60,
.acdirmin = 30,
.acdirmax = 60,
+ .options = 0,
.nfs_server.protocol = IPPROTO_TCP,
};

if (nfs_parse_mount_options((char *) *options, &args) == 0)
return -EINVAL;
+ *_extra_options = args.options;

if (!nfs_verify_server_address((struct sockaddr *)
&args.nfs_server.address))
@@ -1736,6 +1762,7 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
rpc_authflavor_t authflavour;
struct nfs_fh mntfh;
struct dentry *mntroot;
+ unsigned extra_options;
char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
@@ -1745,13 +1772,14 @@ static int nfs4_get_sb(struct file_system_type *fs_type,

/* Validate the mount data */
error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
- &hostname, &mntpath, &ip_addr);
+ &hostname, &mntpath, &ip_addr,
+ &extra_options);
if (error < 0)
goto out;

/* Get a volume representation */
server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
- authflavour, &mntfh);
+ authflavour, extra_options, &mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
-
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