/*
* 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");
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
