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/*

 *  linux/fs/nfs/inode.c

 *

 *  Copyright (C) 1992  Rick Sladkey

 *

 *  nfs inode and superblock handling functions

 *

 *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some

 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.

 *

 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.

 *  J.S.Peatfield@damtp.cam.ac.uk

 *

 */

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/nfs_fs.h>

#include <linux/nfsiod.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/string.h>

#include <linux/stat.h>

#include <linux/errno.h>

#include <linux/locks.h>

#include <linux/smp.h>

#include <linux/smp_lock.h>

#include <asm/system.h>

#include <asm/segment.h>

/* This is for kernel_thread */

#define __KERNEL_SYSCALLS__

#include <linux/unistd.h>

extern int close_fp(struct file *filp);

static int nfs_notify_change(struct inode *, struct iattr *);

static void nfs_put_inode(struct inode *);

static void nfs_put_super(struct super_block *);

static void nfs_read_inode(struct inode *);

static void nfs_statfs(struct super_block *, struct statfs *, int bufsiz);

static struct super_operations nfs_sops = {

        nfs_read_inode,         /* read inode */

        nfs_notify_change,      /* notify change */

        NULL,                   /* write inode */

        nfs_put_inode,          /* put inode */

        nfs_put_super,          /* put superblock */

        NULL,                   /* write superblock */

        nfs_statfs,             /* stat filesystem */

        NULL

};

/*

 * The "read_inode" function doesn't actually do anything:

 * the real data is filled in later in nfs_fhget. Here we

 * just mark the cache times invalid, and zero out i_mode

 * (the latter makes "nfs_refresh_inode" do the right thing

 * wrt pipe inodes)

 */

static void nfs_read_inode(struct inode * inode)

{

        int rsize = inode->i_sb->u.nfs_sb.s_server.rsize;

        int size = inode->i_sb->u.nfs_sb.s_server.wsize;

        if (rsize > size)

                size = rsize;

        inode->i_blksize = size;

        inode->i_mode = 0;

        inode->i_op = NULL;

        NFS_CACHEINV(inode);

}

static void nfs_put_inode(struct inode * inode)

{

        if (NFS_RENAMED_DIR(inode))

                nfs_sillyrename_cleanup(inode);

        if (inode->i_pipe)

                clear_inode(inode);

}

void nfs_put_super(struct super_block *sb)

{

        close_fp(sb->u.nfs_sb.s_server.file);

        rpc_closesock(sb->u.nfs_sb.s_server.rsock);

        lock_super(sb);

        sb->s_dev = 0;

        unlock_super(sb);

        MOD_DEC_USE_COUNT;

}

/*

 * The way this works is that the mount process passes a structure

 * in the data argument which contains an open socket to the NFS

 * server and the root file handle obtained from the server's mount

 * daemon.  We stash these away in the private superblock fields.

 * Later we can add other mount parameters like caching values.

 */

struct super_block *nfs_read_super(struct super_block *sb, void *raw_data,

                                   int silent)

{

        struct nfs_mount_data *data = (struct nfs_mount_data *) raw_data;

        struct nfs_server *server;

        unsigned int fd;

        struct file *filp;

        kdev_t dev = sb->s_dev;

        MOD_INC_USE_COUNT;

        if (!data) {

                printk("nfs_read_super: missing data argument\n");

                sb->s_dev = 0;

                MOD_DEC_USE_COUNT;

                return NULL;

        }

        fd = data->fd;

        if (data->version != NFS_MOUNT_VERSION) {

                printk("nfs warning: mount version %s than kernel\n",

                        data->version < NFS_MOUNT_VERSION ? "older" : "newer");

        }

        if (fd >= NR_OPEN || !(filp = current->files->fd[fd])) {

                printk("nfs_read_super: invalid file descriptor\n");

                sb->s_dev = 0;

                MOD_DEC_USE_COUNT;

                return NULL;

        }

        if (!S_ISSOCK(filp->f_inode->i_mode)) {

                printk("nfs_read_super: not a socket\n");

                sb->s_dev = 0;

                MOD_DEC_USE_COUNT;

                return NULL;

        }

        filp->f_count++;

        lock_super(sb);

        sb->s_blocksize = 1024; /* XXX */

        sb->s_blocksize_bits = 10;

        sb->s_magic = NFS_SUPER_MAGIC;

        sb->s_dev = dev;

        sb->s_op = &nfs_sops;

        server = &sb->u.nfs_sb.s_server;

        server->file = filp;

        server->lock = 0;

        server->wait = NULL;

        server->flags = data->flags;

        server->rsize = data->rsize;

        if (server->rsize <= 0)

                server->rsize = NFS_DEF_FILE_IO_BUFFER_SIZE;

        else if (server->rsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)

                server->rsize = NFS_MAX_FILE_IO_BUFFER_SIZE;

        server->wsize = data->wsize;

        if (server->wsize <= 0)

                server->wsize = NFS_DEF_FILE_IO_BUFFER_SIZE;

        else if (server->wsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)

                server->wsize = NFS_MAX_FILE_IO_BUFFER_SIZE;

        server->timeo = data->timeo*HZ/10;

        server->retrans = data->retrans;

        server->acregmin = data->acregmin*HZ;

        server->acregmax = data->acregmax*HZ;

        server->acdirmin = data->acdirmin*HZ;

        server->acdirmax = data->acdirmax*HZ;

        strcpy(server->hostname, data->hostname);

        /* Start of JSP NFS patch */

        /* Check if passed address in data->addr */

        if (data->addr.sin_addr.s_addr == INADDR_ANY) {  /* No address passed */

          if (((struct sockaddr_in *)(&server->toaddr))->sin_addr.s_addr == INADDR_ANY) {

            printk("NFS: Error passed unconnected socket and no address\n") ;

            MOD_DEC_USE_COUNT;

            return NULL ;

          } else {

            /* Need access to socket internals  JSP */

            struct socket *sock;

            int dummylen ;

         /*   printk("NFS: using socket address\n") ;*/

            sock = &((filp->f_inode)->u.socket_i);

            /* extract the other end of the socket into server->toaddr */

            sock->ops->getname(sock, &(server->toaddr), &dummylen, 1) ;

          }

        } else {

        /*  printk("NFS: copying passed addr to server->toaddr\n") ;*/

          memcpy((char *)&(server->toaddr),(char *)(&data->addr),sizeof(server->toaddr));

        }

        /* End of JSP NFS patch */

        if ((server->rsock = rpc_makesock(filp)) == NULL) {

                printk("NFS: cannot create RPC socket.\n");

                MOD_DEC_USE_COUNT;

                return NULL;

        }

        sb->u.nfs_sb.s_root = data->root;

        unlock_super(sb);

        if (!(sb->s_mounted = nfs_fhget(sb, &data->root, NULL))) {

                sb->s_dev = 0;

                printk("nfs_read_super: get root inode failed\n");

                MOD_DEC_USE_COUNT;

                return NULL;

        }

        return sb;

}

void nfs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)

{

        int error;

        struct nfs_fsinfo res;

        struct statfs tmp;

        error = nfs_proc_statfs(&sb->u.nfs_sb.s_server, &sb->u.nfs_sb.s_root,

                &res);

        if (error) {

                printk("nfs_statfs: statfs error = %d\n", -error);

                res.bsize = res.blocks = res.bfree = res.bavail = 0;

        }

        tmp.f_type = NFS_SUPER_MAGIC;

        tmp.f_bsize = res.bsize;

        tmp.f_blocks = res.blocks;

        tmp.f_bfree = res.bfree;

        tmp.f_bavail = res.bavail;

        tmp.f_files = 0;

        tmp.f_ffree = 0;

        tmp.f_namelen = NAME_MAX;

        memcpy_tofs(buf, &tmp, bufsiz);

}

/*

 * This is our own version of iget that looks up inodes by file handle

 * instead of inode number.  We use this technique instead of using

 * the vfs read_inode function because there is no way to pass the

 * file handle or current attributes into the read_inode function.

 * We just have to be careful not to subvert iget's special handling

 * of mount points.

 */

struct inode *nfs_fhget(struct super_block *sb, struct nfs_fh *fhandle,

                        struct nfs_fattr *fattr)

{

        struct nfs_fattr newfattr;

        int error;

        struct inode *inode;

        if (!sb) {

                printk("nfs_fhget: super block is NULL\n");

                return NULL;

        }

        if (!fattr) {

                error = nfs_proc_getattr(&sb->u.nfs_sb.s_server, fhandle,

                        &newfattr);

                if (error) {

                        printk("nfs_fhget: getattr error = %d\n", -error);

                        return NULL;

                }

                fattr = &newfattr;

        }

        if (!(inode = iget(sb, fattr->fileid))) {

                printk("nfs_fhget: iget failed\n");

                return NULL;

        }

        if (inode->i_dev == sb->s_dev) {

                if (inode->i_ino != fattr->fileid) {

                        printk("nfs_fhget: unexpected inode from iget\n");

                        return inode;

                }

                *NFS_FH(inode) = *fhandle;

                nfs_refresh_inode(inode, fattr);

        }

        return inode;

}

int nfs_notify_change(struct inode *inode, struct iattr *attr)

{

        struct nfs_sattr sattr;

        struct nfs_fattr fattr;

        int error;

        sattr.mode = (unsigned) -1;

        if (attr->ia_valid & ATTR_MODE)

                sattr.mode = attr->ia_mode;

        sattr.uid = (unsigned) -1;

        if (attr->ia_valid & ATTR_UID)

                sattr.uid = attr->ia_uid;

        sattr.gid = (unsigned) -1;

        if (attr->ia_valid & ATTR_GID)

                sattr.gid = attr->ia_gid;

        sattr.size = (unsigned) -1;

        if (attr->ia_valid & ATTR_SIZE)

                sattr.size = S_ISREG(inode->i_mode) ? attr->ia_size : -1;

        sattr.mtime.seconds = sattr.mtime.useconds = (unsigned) -1;

        if (attr->ia_valid & ATTR_MTIME) {

                sattr.mtime.seconds = attr->ia_mtime;

                sattr.mtime.useconds = 0;

        }

        sattr.atime.seconds = sattr.atime.useconds = (unsigned) -1;

        if (attr->ia_valid & ATTR_ATIME) {

                sattr.atime.seconds = attr->ia_atime;

                sattr.atime.useconds = 0;

        }

        error = nfs_proc_setattr(NFS_SERVER(inode), NFS_FH(inode),

                &sattr, &fattr);

        if (!error)

                nfs_refresh_inode(inode, &fattr);

        inode->i_dirt = 0;

        return error;

}

/* Every kernel module contains stuff like this. */

static struct file_system_type nfs_fs_type = {

        nfs_read_super, "nfs", 0, NULL

};

/*

 * Start up an nfsiod process. This is an awful hack, because when running

 * as a module, we will keep insmod's memory. Besides, the current->comm

 * hack won't work in this case

 * The best would be to have a syscall for nfs client control that (among

 * other things) forks biod's.

 * Alternatively, we might want to have the idle task spawn biod's on demand.

 */

static int run_nfsiod(void *dummy)

{

        int     ret;

#ifdef __SMP__

        lock_kernel();

        syscall_count++;

#endif

        MOD_INC_USE_COUNT;

        exit_mm(current);

        current->session = 1;

        current->pgrp = 1;

        sprintf(current->comm, "nfsiod");

#ifndef MODULE

        current->blocked = ~0UL;

#endif

        ret = nfsiod();

        MOD_DEC_USE_COUNT;

        return ret;

}

int init_nfs_fs(void)

{

        /* Fork four biod's */

        kernel_thread(run_nfsiod, NULL, 0);

        kernel_thread(run_nfsiod, NULL, 0);

        kernel_thread(run_nfsiod, NULL, 0);

        kernel_thread(run_nfsiod, NULL, 0);

        return register_filesystem(&nfs_fs_type);

}

#ifdef MODULE

int init_module(void)

{

        int status;

        if ((status = init_nfs_fs()) == 0)

                register_symtab(0);

        return status;

}

void cleanup_module(void)

{

        unregister_filesystem(&nfs_fs_type);

        nfs_kfree_cache();

}

#endif