From 8cab4c390b43fe34c07bd33799c1bc24be648122 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 21 May 2012 22:45:59 -0400 Subject: [PATCH] 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 Signed-off-by: Trond Myklebust --- fs/nfs/client.c | 76 +++++++++++++++++++++++------------------ fs/nfs/internal.h | 4 +-- include/linux/nfs_xdr.h | 3 +- 3 files changed, 46 insertions(+), 37 deletions(-) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 5f19f9577730..8a4b3c2c5a2b 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -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); } /* diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 989959a59f07..3a9e80c9524b 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -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, diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index c420b8d60a55..0c521cd496a7 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -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); }; -- 2.30.2