kernel-ark/fs/nfsd/nfsctl.c
Arjan van de Ven 4b6f5d20b0 [PATCH] Make most file operations structs in fs/ const
This is a conversion to make the various file_operations structs in fs/
const.  Basically a regexp job, with a few manual fixups

The goal is both to increase correctness (harder to accidentally write to
shared datastructures) and reducing the false sharing of cachelines with
things that get dirty in .data (while .rodata is nicely read only and thus
cache clean)

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 09:16:06 -08:00

555 lines
13 KiB
C

/*
* linux/fs/nfsd/nfsctl.c
*
* Syscall interface to knfsd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/nfs.h>
#include <linux/nfsd_idmap.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/nfsd/interface.h>
#include <asm/uaccess.h>
unsigned int nfsd_versbits = ~0;
/*
* We have a single directory with 9 nodes in it.
*/
enum {
NFSD_Root = 1,
NFSD_Svc,
NFSD_Add,
NFSD_Del,
NFSD_Export,
NFSD_Unexport,
NFSD_Getfd,
NFSD_Getfs,
NFSD_List,
NFSD_Fh,
NFSD_Threads,
NFSD_Versions,
/*
* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
*/
#ifdef CONFIG_NFSD_V4
NFSD_Leasetime,
NFSD_RecoveryDir,
#endif
};
/*
* write() for these nodes.
*/
static ssize_t write_svc(struct file *file, char *buf, size_t size);
static ssize_t write_add(struct file *file, char *buf, size_t size);
static ssize_t write_del(struct file *file, char *buf, size_t size);
static ssize_t write_export(struct file *file, char *buf, size_t size);
static ssize_t write_unexport(struct file *file, char *buf, size_t size);
static ssize_t write_getfd(struct file *file, char *buf, size_t size);
static ssize_t write_getfs(struct file *file, char *buf, size_t size);
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Svc] = write_svc,
[NFSD_Add] = write_add,
[NFSD_Del] = write_del,
[NFSD_Export] = write_export,
[NFSD_Unexport] = write_unexport,
[NFSD_Getfd] = write_getfd,
[NFSD_Getfs] = write_getfs,
[NFSD_Fh] = write_filehandle,
[NFSD_Threads] = write_threads,
[NFSD_Versions] = write_versions,
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = write_leasetime,
[NFSD_RecoveryDir] = write_recoverydir,
#endif
};
static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
{
ino_t ino = file->f_dentry->d_inode->i_ino;
char *data;
ssize_t rv;
if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
return -EINVAL;
data = simple_transaction_get(file, buf, size);
if (IS_ERR(data))
return PTR_ERR(data);
rv = write_op[ino](file, data, size);
if (rv>0) {
simple_transaction_set(file, rv);
rv = size;
}
return rv;
}
static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
if (! file->private_data) {
/* An attempt to read a transaction file without writing
* causes a 0-byte write so that the file can return
* state information
*/
ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
if (rv < 0)
return rv;
}
return simple_transaction_read(file, buf, size, pos);
}
static const struct file_operations transaction_ops = {
.write = nfsctl_transaction_write,
.read = nfsctl_transaction_read,
.release = simple_transaction_release,
};
extern struct seq_operations nfs_exports_op;
static int exports_open(struct inode *inode, struct file *file)
{
return seq_open(file, &nfs_exports_op);
}
static const struct file_operations exports_operations = {
.open = exports_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
/*----------------------------------------------------------------------------*/
/*
* payload - write methods
* If the method has a response, the response should be put in buf,
* and the length returned. Otherwise return 0 or and -error.
*/
static ssize_t write_svc(struct file *file, char *buf, size_t size)
{
struct nfsctl_svc *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_svc*) buf;
return nfsd_svc(data->svc_port, data->svc_nthreads);
}
static ssize_t write_add(struct file *file, char *buf, size_t size)
{
struct nfsctl_client *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_client *)buf;
return exp_addclient(data);
}
static ssize_t write_del(struct file *file, char *buf, size_t size)
{
struct nfsctl_client *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_client *)buf;
return exp_delclient(data);
}
static ssize_t write_export(struct file *file, char *buf, size_t size)
{
struct nfsctl_export *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_export*)buf;
return exp_export(data);
}
static ssize_t write_unexport(struct file *file, char *buf, size_t size)
{
struct nfsctl_export *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_export*)buf;
return exp_unexport(data);
}
static ssize_t write_getfs(struct file *file, char *buf, size_t size)
{
struct nfsctl_fsparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh *res;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fsparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
sin = (struct sockaddr_in *)&data->gd_addr;
if (data->gd_maxlen > NFS3_FHSIZE)
data->gd_maxlen = NFS3_FHSIZE;
res = (struct knfsd_fh*)buf;
exp_readlock();
if (!(clp = auth_unix_lookup(sin->sin_addr)))
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0)
err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
out:
return err;
}
static ssize_t write_getfd(struct file *file, char *buf, size_t size)
{
struct nfsctl_fdparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh fh;
char *res;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fdparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
err = -EINVAL;
if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
goto out;
res = buf;
sin = (struct sockaddr_in *)&data->gd_addr;
exp_readlock();
if (!(clp = auth_unix_lookup(sin->sin_addr)))
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0) {
memset(res,0, NFS_FHSIZE);
memcpy(res, &fh.fh_base, fh.fh_size);
err = NFS_FHSIZE;
}
out:
return err;
}
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
/* request is:
* domain path maxsize
* response is
* filehandle
*
* qword quoting is used, so filehandle will be \x....
*/
char *dname, *path;
int maxsize;
char *mesg = buf;
int len;
struct auth_domain *dom;
struct knfsd_fh fh;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
dname = mesg;
len = qword_get(&mesg, dname, size);
if (len <= 0) return -EINVAL;
path = dname+len+1;
len = qword_get(&mesg, path, size);
if (len <= 0) return -EINVAL;
len = get_int(&mesg, &maxsize);
if (len)
return len;
if (maxsize < NFS_FHSIZE)
return -EINVAL;
if (maxsize > NFS3_FHSIZE)
maxsize = NFS3_FHSIZE;
if (qword_get(&mesg, mesg, size)>0)
return -EINVAL;
/* we have all the words, they are in buf.. */
dom = unix_domain_find(dname);
if (!dom)
return -ENOMEM;
len = exp_rootfh(dom, path, &fh, maxsize);
auth_domain_put(dom);
if (len)
return len;
mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
mesg[-1] = '\n';
return mesg - buf;
}
extern int nfsd_nrthreads(void);
static ssize_t write_threads(struct file *file, char *buf, size_t size)
{
/* if size > 0, look for a number of threads and call nfsd_svc
* then write out number of threads as reply
*/
char *mesg = buf;
int rv;
if (size > 0) {
int newthreads;
rv = get_int(&mesg, &newthreads);
if (rv)
return rv;
if (newthreads <0)
return -EINVAL;
rv = nfsd_svc(2049, newthreads);
if (rv)
return rv;
}
sprintf(buf, "%d\n", nfsd_nrthreads());
return strlen(buf);
}
static ssize_t write_versions(struct file *file, char *buf, size_t size)
{
/*
* Format:
* [-/+]vers [-/+]vers ...
*/
char *mesg = buf;
char *vers, sign;
int len, num;
ssize_t tlen = 0;
char *sep;
if (size>0) {
if (nfsd_serv)
return -EBUSY;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
vers = mesg;
len = qword_get(&mesg, vers, size);
if (len <= 0) return -EINVAL;
do {
sign = *vers;
if (sign == '+' || sign == '-')
num = simple_strtol((vers+1), NULL, 0);
else
num = simple_strtol(vers, NULL, 0);
switch(num) {
case 2:
case 3:
case 4:
if (sign != '-')
NFSCTL_VERSET(nfsd_versbits, num);
else
NFSCTL_VERUNSET(nfsd_versbits, num);
break;
default:
return -EINVAL;
}
vers += len + 1;
tlen += len;
} while ((len = qword_get(&mesg, vers, size)) > 0);
/* If all get turned off, turn them back on, as
* having no versions is BAD
*/
if ((nfsd_versbits & NFSCTL_VERALL)==0)
nfsd_versbits = NFSCTL_VERALL;
}
/* Now write current state into reply buffer */
len = 0;
sep = "";
for (num=2 ; num <= 4 ; num++)
if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
len += sprintf(buf+len, "%s%c%d", sep,
NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
num);
sep = " ";
}
len += sprintf(buf+len, "\n");
return len;
}
#ifdef CONFIG_NFSD_V4
extern time_t nfs4_leasetime(void);
static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
{
/* if size > 10 seconds, call
* nfs4_reset_lease() then write out the new lease (seconds) as reply
*/
char *mesg = buf;
int rv;
if (size > 0) {
int lease;
rv = get_int(&mesg, &lease);
if (rv)
return rv;
if (lease < 10 || lease > 3600)
return -EINVAL;
nfs4_reset_lease(lease);
}
sprintf(buf, "%ld\n", nfs4_lease_time());
return strlen(buf);
}
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
char *recdir;
int len, status;
if (size > PATH_MAX || buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
recdir = mesg;
len = qword_get(&mesg, recdir, size);
if (len <= 0)
return -EINVAL;
status = nfs4_reset_recoverydir(recdir);
return strlen(buf);
}
#endif
/*----------------------------------------------------------------------------*/
/*
* populating the filesystem.
*/
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
{
static struct tree_descr nfsd_files[] = {
[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
#endif
/* last one */ {""}
};
return simple_fill_super(sb, 0x6e667364, nfsd_files);
}
static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_single(fs_type, flags, data, nfsd_fill_super);
}
static struct file_system_type nfsd_fs_type = {
.owner = THIS_MODULE,
.name = "nfsd",
.get_sb = nfsd_get_sb,
.kill_sb = kill_litter_super,
};
static int __init init_nfsd(void)
{
int retval;
printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
nfsd_stat_init(); /* Statistics */
nfsd_cache_init(); /* RPC reply cache */
nfsd_export_init(); /* Exports table */
nfsd_lockd_init(); /* lockd->nfsd callbacks */
nfs4_state_init(); /* NFSv4 locking state */
nfsd_idmap_init(); /* Name to ID mapping */
if (proc_mkdir("fs/nfs", NULL)) {
struct proc_dir_entry *entry;
entry = create_proc_entry("fs/nfs/exports", 0, NULL);
if (entry)
entry->proc_fops = &exports_operations;
}
retval = register_filesystem(&nfsd_fs_type);
if (retval) {
nfsd_export_shutdown();
nfsd_cache_shutdown();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
nfsd_stat_shutdown();
nfsd_lockd_shutdown();
}
return retval;
}
static void __exit exit_nfsd(void)
{
nfsd_export_shutdown();
nfsd_cache_shutdown();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
nfsd_stat_shutdown();
nfsd_lockd_shutdown();
nfsd_idmap_shutdown();
unregister_filesystem(&nfsd_fs_type);
}
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfsd)
module_exit(exit_nfsd)