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199 |
simons |
/*
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* linux/fs/nfs/sock.c
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*
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* Copyright (C) 1992, 1993 Rick Sladkey
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*
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* low-level nfs remote procedure call interface
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*
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* FIXES
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*
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* 2/7/94 James Bottomley and Jon Peatfield DAMTP, Cambridge University
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*
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* An xid mismatch no longer causes the request to be trashed.
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*
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* Peter Eriksson - incorrect XID used to confuse Linux
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* Florian La Roche - use the correct max size, if reading a packet and
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* also verify, if the whole packet has been read...
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* more checks should be done in proc.c...
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*
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*/
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#include <linux/sched.h>
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#include <linux/nfs_fs.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/fcntl.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/mm.h>
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#include <linux/rpcsock.h>
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#include <asm/segment.h>
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#define _S(nr) (1<<((nr)-1))
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/*
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* Place a synchronous call to the NFS server, meaning that the process
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* sleeps in rpc_call until it either receives a reply or a major timeout
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* occurs.
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* This is now merely a front-end to nfs_rpc_doio.
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*/
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int
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nfs_rpc_call(struct nfs_server *server, int *start, int *end, int size)
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{
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struct rpc_ioreq req;
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size += 1024; /* account for NFS slack space. ugly */
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req.rq_addr = &server->toaddr;
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req.rq_alen = sizeof(server->toaddr);
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req.rq_slot = NULL;
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req.rq_svec[0].iov_base = start;
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req.rq_svec[0].iov_len = (end - start) << 2;
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req.rq_slen = (end - start) << 2;
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req.rq_snr = 1;
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req.rq_rvec[0].iov_base = start;
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req.rq_rvec[0].iov_len = size;
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req.rq_rlen = size;
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req.rq_rnr = 1;
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return nfs_rpc_doio(server, &req, 0);
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}
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int
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nfs_rpc_doio(struct nfs_server *server, struct rpc_ioreq *req, int async)
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{
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struct rpc_timeout timeout;
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unsigned long maxtimeo;
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unsigned long oldmask;
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int major_timeout_seen, result;
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timeout.to_initval = server->timeo;
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timeout.to_maxval = NFS_MAX_RPC_TIMEOUT*HZ/10;
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timeout.to_retries = server->retrans;
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timeout.to_exponential = 1;
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oldmask = current->blocked;
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current->blocked |= ~(_S(SIGKILL)
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| ((server->flags & NFS_MOUNT_INTR)
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? ((current->sig->action[SIGINT - 1].sa_handler == SIG_DFL
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? _S(SIGINT) : 0)
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| (current->sig->action[SIGQUIT - 1].sa_handler == SIG_DFL
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? _S(SIGQUIT) : 0))
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: 0));
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major_timeout_seen = 0;
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maxtimeo = timeout.to_maxval;
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do {
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result = rpc_doio(server->rsock, req, &timeout, async);
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rpc_release(server->rsock, req); /* Release slot */
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if (current->signal & ~current->blocked)
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result = -ERESTARTSYS;
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if (result == -ETIMEDOUT) {
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if (async)
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break;
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if (server->flags & NFS_MOUNT_SOFT) {
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printk("NFS server %s not responding, "
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"timed out.\n", server->hostname);
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result = -EIO;
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break;
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}
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if (!major_timeout_seen) {
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printk("NFS server %s not responding, "
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"still trying.\n", server->hostname);
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major_timeout_seen = 1;
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}
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if ((timeout.to_initval <<= 1) >= maxtimeo) {
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timeout.to_initval = maxtimeo;
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}
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} else if (result < 0 && result != -ERESTARTSYS) {
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printk("NFS: notice message: result = %d.\n", result);
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}
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} while (result == -ETIMEDOUT && !(server->flags & NFS_MOUNT_SOFT));
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if (result >= 0 && major_timeout_seen)
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printk("NFS server %s OK.\n", server->hostname);
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/* 20 is the minimum RPC reply header size */
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if (result >= 0 && result < 20) {
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printk("NFS: too small read memory size (%d bytes)\n", result);
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result = -EIO;
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}
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current->blocked = oldmask;
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return result;
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}
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