From b1f69b754ee312ec75f2c7ead0e6851cd9598cc2 Mon Sep 17 00:00:00 2001 From: Andy Adamson Date: Wed, 20 Oct 2010 00:18:03 -0400 Subject: NFSv4.1: pnfs: add LAYOUTGET and GETDEVICEINFO infrastructure Add the ability to actually send LAYOUTGET and GETDEVICEINFO. This also adds in the machinery to handle layout state and the deviceid cache. Note that GETDEVICEINFO is not called directly by the generic layer. Instead it is called by the drivers while parsing the LAYOUTGET opaque data in response to an unknown device id embedded therein. RFC 5661 only encodes device ids within the driver-specific opaque data. Signed-off-by: Andy Adamson Signed-off-by: Dean Hildebrand Signed-off-by: Marc Eshel Signed-off-by: Mike Sager Signed-off-by: Ricardo Labiaga Signed-off-by: Tao Guo Signed-off-by: Boaz Harrosh Signed-off-by: Fred Isaman Signed-off-by: Trond Myklebust --- fs/nfs/nfs4proc.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) (limited to 'fs/nfs/nfs4proc.c') diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index a5f1edb..7e14e99 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -55,6 +55,7 @@ #include "internal.h" #include "iostat.h" #include "callback.h" +#include "pnfs.h" #define NFSDBG_FACILITY NFSDBG_PROC @@ -5256,6 +5257,147 @@ out: dprintk("<-- %s status=%d\n", __func__, status); return status; } + +static void +nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) +{ + struct nfs4_layoutget *lgp = calldata; + struct inode *ino = lgp->args.inode; + struct nfs_server *server = NFS_SERVER(ino); + + dprintk("--> %s\n", __func__); + if (nfs4_setup_sequence(server, &lgp->args.seq_args, + &lgp->res.seq_res, 0, task)) + return; + rpc_call_start(task); +} + +static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) +{ + struct nfs4_layoutget *lgp = calldata; + struct nfs_server *server = NFS_SERVER(lgp->args.inode); + + dprintk("--> %s\n", __func__); + + if (!nfs4_sequence_done(task, &lgp->res.seq_res)) + return; + + switch (task->tk_status) { + case 0: + break; + case -NFS4ERR_LAYOUTTRYLATER: + case -NFS4ERR_RECALLCONFLICT: + task->tk_status = -NFS4ERR_DELAY; + /* Fall through */ + default: + if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) { + rpc_restart_call_prepare(task); + return; + } + } + lgp->status = task->tk_status; + dprintk("<-- %s\n", __func__); +} + +static void nfs4_layoutget_release(void *calldata) +{ + struct nfs4_layoutget *lgp = calldata; + + dprintk("--> %s\n", __func__); + put_layout_hdr(lgp->args.inode); + if (lgp->res.layout.buf != NULL) + free_page((unsigned long) lgp->res.layout.buf); + put_nfs_open_context(lgp->args.ctx); + kfree(calldata); + dprintk("<-- %s\n", __func__); +} + +static const struct rpc_call_ops nfs4_layoutget_call_ops = { + .rpc_call_prepare = nfs4_layoutget_prepare, + .rpc_call_done = nfs4_layoutget_done, + .rpc_release = nfs4_layoutget_release, +}; + +int nfs4_proc_layoutget(struct nfs4_layoutget *lgp) +{ + struct nfs_server *server = NFS_SERVER(lgp->args.inode); + struct rpc_task *task; + struct rpc_message msg = { + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], + .rpc_argp = &lgp->args, + .rpc_resp = &lgp->res, + }; + struct rpc_task_setup task_setup_data = { + .rpc_client = server->client, + .rpc_message = &msg, + .callback_ops = &nfs4_layoutget_call_ops, + .callback_data = lgp, + .flags = RPC_TASK_ASYNC, + }; + int status = 0; + + dprintk("--> %s\n", __func__); + + lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS); + if (lgp->res.layout.buf == NULL) { + nfs4_layoutget_release(lgp); + return -ENOMEM; + } + + lgp->res.seq_res.sr_slot = NULL; + task = rpc_run_task(&task_setup_data); + if (IS_ERR(task)) + return PTR_ERR(task); + status = nfs4_wait_for_completion_rpc_task(task); + if (status != 0) + goto out; + status = lgp->status; + if (status != 0) + goto out; + status = pnfs_layout_process(lgp); +out: + rpc_put_task(task); + dprintk("<-- %s status=%d\n", __func__, status); + return status; +} + +static int +_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) +{ + struct nfs4_getdeviceinfo_args args = { + .pdev = pdev, + }; + struct nfs4_getdeviceinfo_res res = { + .pdev = pdev, + }; + struct rpc_message msg = { + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], + .rpc_argp = &args, + .rpc_resp = &res, + }; + int status; + + dprintk("--> %s\n", __func__); + status = nfs4_call_sync(server, &msg, &args, &res, 0); + dprintk("<-- %s status=%d\n", __func__, status); + + return status; +} + +int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev) +{ + struct nfs4_exception exception = { }; + int err; + + do { + err = nfs4_handle_exception(server, + _nfs4_proc_getdeviceinfo(server, pdev), + &exception); + } while (exception.retry); + return err; +} +EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); + #endif /* CONFIG_NFS_V4_1 */ struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { -- cgit v1.1