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