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NFS: Refactor nfs_get_client(): initialize nfs_client 

Clean up: Continue to rationalize the locking in nfs_get_client() by
moving the logic that handles the case where a matching server IP
address is not found.

When we support server trunking detection, client initialization may
return a different nfs_client struct than was passed to it.  Change
the synopsis of the init_client methods to return an nfs_client.

The client initialization logic in nfs_get_client() is not much more
than a wrapper around ->init_client.  It's simpler to keep the little
bits of error handling in the version-specific init_client methods.

No behavior change is expected.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2012-05-21 22:45:59 -04:00 committed by Trond Myklebust
parent f411703adc
commit 8cab4c390b
3 changed files with 46 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
fs/nfs/client.c
View File

@ -546,7 +546,6 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
int noresvport)
{
struct nfs_client *clp, *new = NULL;
int error;
struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id);
dprintk("--> nfs_get_client(%s,v%u)\n",
@ -563,8 +562,13 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
nfs_free_client(new);
return nfs_found_client(cl_init, clp);
}
if (new)
goto install_client;
if (new) {
list_add(&new->cl_share_link, &nn->nfs_client_list);
spin_unlock(&nn->nfs_client_lock);
return cl_init->rpc_ops->init_client(new,
timeparms, ip_addr,
authflavour, noresvport);
}
spin_unlock(&nn->nfs_client_lock);
@ -574,21 +578,6 @@ nfs_get_client(const struct nfs_client_initdata *cl_init,
dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n",
cl_init->hostname ?: "", PTR_ERR(new));
return new;
/* install a new client and return with it unready */
install_client:
clp = new;
list_add(&clp->cl_share_link, &nn->nfs_client_list);
spin_unlock(&nn->nfs_client_lock);
error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr,
authflavour, noresvport);
if (error < 0) {
nfs_put_client(clp);
return ERR_PTR(error);
}
dprintk("--> nfs_get_client() = %p [new]\n", clp);
return clp;
}
/*
@ -813,10 +802,19 @@ static int nfs_init_server_rpcclient(struct nfs_server *server,
return 0;
}
/*
* Initialise an NFS2 or NFS3 client
/**
* nfs_init_client - Initialise an NFS2 or NFS3 client
*
* @clp: nfs_client to initialise
* @timeparms: timeout parameters for underlying RPC transport
* @ip_addr: IP presentation address (not used)
* @authflavor: authentication flavor for underlying RPC transport
* @noresvport: set if RPC transport can use an ephemeral source port
*
* Returns pointer to an NFS client, or an ERR_PTR value.
*/
int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
struct nfs_client *nfs_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const char *ip_addr, rpc_authflavor_t authflavour,
int noresvport)
{
@ -825,7 +823,7 @@ int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
if (clp->cl_cons_state == NFS_CS_READY) {
/* the client is already initialised */
dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
return 0;
return clp;
}
/*
@ -837,12 +835,13 @@ int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms,
if (error < 0)
goto error;
nfs_mark_client_ready(clp, NFS_CS_READY);
return 0;
return clp;
error:
nfs_mark_client_ready(clp, error);
nfs_put_client(clp);
dprintk("<-- nfs_init_client() = xerror %d\n", error);
return error;
return ERR_PTR(error);
}
/*
@ -1358,14 +1357,22 @@ static int nfs4_init_client_minor_version(struct nfs_client *clp)
return nfs4_init_callback(clp);
}
/*
* Initialise an NFS4 client record
/**
* nfs4_init_client - Initialise an NFS4 client record
*
* @clp: nfs_client to initialise
* @timeparms: timeout parameters for underlying RPC transport
* @ip_addr: callback IP address in presentation format
* @authflavor: authentication flavor for underlying RPC transport
* @noresvport: set if RPC transport can use an ephemeral source port
*
* Returns pointer to an NFS client, or an ERR_PTR value.
*/
int nfs4_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const char *ip_addr,
rpc_authflavor_t authflavour,
int noresvport)
struct nfs_client *nfs4_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const char *ip_addr,
rpc_authflavor_t authflavour,
int noresvport)
{
char buf[INET6_ADDRSTRLEN + 1];
int error;
@ -1373,7 +1380,7 @@ int nfs4_init_client(struct nfs_client *clp,
if (clp->cl_cons_state == NFS_CS_READY) {
/* the client is initialised already */
dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
return 0;
return clp;
}
/* Check NFS protocol revision and initialize RPC op vector */
@ -1413,12 +1420,13 @@ int nfs4_init_client(struct nfs_client *clp,
if (!nfs4_has_session(clp))
nfs_mark_client_ready(clp, NFS_CS_READY);
return 0;
return clp;
error:
nfs_mark_client_ready(clp, error);
nfs_put_client(clp);
dprintk("<-- nfs4_init_client() = xerror %d\n", error);
return error;
return ERR_PTR(error);
}
/*

4
fs/nfs/internal.h
View File

@ -238,7 +238,7 @@ extern int nfs4_init_ds_session(struct nfs_client *clp);
/* proc.c */
void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
extern int nfs_init_client(struct nfs_client *clp,
extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const char *ip_addr, rpc_authflavor_t authflavour,
int noresvport);
@ -373,7 +373,7 @@ void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
/* nfs4proc.c */
extern void __nfs4_read_done_cb(struct nfs_read_data *);
extern int nfs4_init_client(struct nfs_client *clp,
extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
const struct rpc_timeout *timeparms,
const char *ip_addr,
rpc_authflavor_t authflavour,

3
include/linux/nfs_xdr.h
View File

@ -1397,7 +1397,8 @@ struct nfs_rpc_ops {
struct nfs_open_context *ctx,
int open_flags,
struct iattr *iattr);
int (*init_client) (struct nfs_client *, const struct rpc_timeout *,
struct nfs_client *
(*init_client) (struct nfs_client *, const struct rpc_timeout *,
const char *, rpc_authflavor_t, int);
};