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![J. Bruce Fields](/assets/img/avatar_default.png)
A process could race in an open and attempt to read one of these files before i_private is initialized, and get a spurious error. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1578 lines
39 KiB
C
1578 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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/slab.h>
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#include <linux/namei.h>
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#include <linux/ctype.h>
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#include <linux/fs_context.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/lockd/lockd.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/sunrpc/gss_krb5_enctypes.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/module.h>
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#include <linux/fsnotify.h>
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#include "idmap.h"
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#include "nfsd.h"
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#include "cache.h"
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#include "state.h"
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#include "netns.h"
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#include "pnfs.h"
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/*
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* We have a single directory with several nodes in it.
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*/
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enum {
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NFSD_Root = 1,
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NFSD_List,
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NFSD_Export_features,
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NFSD_Fh,
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NFSD_FO_UnlockIP,
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NFSD_FO_UnlockFS,
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NFSD_Threads,
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NFSD_Pool_Threads,
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NFSD_Pool_Stats,
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NFSD_Reply_Cache_Stats,
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NFSD_Versions,
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NFSD_Ports,
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NFSD_MaxBlkSize,
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NFSD_MaxConnections,
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NFSD_SupportedEnctypes,
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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_Gracetime,
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NFSD_RecoveryDir,
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NFSD_V4EndGrace,
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#endif
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NFSD_MaxReserved
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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_filehandle(struct file *file, char *buf, size_t size);
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static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
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static ssize_t write_unlock_fs(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_pool_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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static ssize_t write_ports(struct file *file, char *buf, size_t size);
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static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
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static ssize_t write_maxconn(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_gracetime(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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static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
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#endif
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static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
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[NFSD_Fh] = write_filehandle,
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[NFSD_FO_UnlockIP] = write_unlock_ip,
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[NFSD_FO_UnlockFS] = write_unlock_fs,
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[NFSD_Threads] = write_threads,
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[NFSD_Pool_Threads] = write_pool_threads,
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[NFSD_Versions] = write_versions,
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[NFSD_Ports] = write_ports,
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[NFSD_MaxBlkSize] = write_maxblksize,
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[NFSD_MaxConnections] = write_maxconn,
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#ifdef CONFIG_NFSD_V4
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[NFSD_Leasetime] = write_leasetime,
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[NFSD_Gracetime] = write_gracetime,
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[NFSD_RecoveryDir] = write_recoverydir,
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[NFSD_V4EndGrace] = write_v4_end_grace,
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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_inode(file)->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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.llseek = default_llseek,
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};
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static int exports_net_open(struct net *net, struct file *file)
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{
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int err;
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struct seq_file *seq;
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struct nfsd_net *nn = net_generic(net, nfsd_net_id);
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err = seq_open(file, &nfs_exports_op);
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if (err)
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return err;
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seq = file->private_data;
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seq->private = nn->svc_export_cache;
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return 0;
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}
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static int exports_proc_open(struct inode *inode, struct file *file)
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{
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return exports_net_open(current->nsproxy->net_ns, file);
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}
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static const struct file_operations exports_proc_operations = {
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.open = exports_proc_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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static int exports_nfsd_open(struct inode *inode, struct file *file)
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{
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return exports_net_open(inode->i_sb->s_fs_info, file);
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}
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static const struct file_operations exports_nfsd_operations = {
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.open = exports_nfsd_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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static int export_features_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
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return 0;
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}
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static int export_features_open(struct inode *inode, struct file *file)
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{
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return single_open(file, export_features_show, NULL);
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}
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static const struct file_operations export_features_operations = {
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.open = export_features_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
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static int supported_enctypes_show(struct seq_file *m, void *v)
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{
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seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
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return 0;
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}
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static int supported_enctypes_open(struct inode *inode, struct file *file)
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{
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return single_open(file, supported_enctypes_show, NULL);
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}
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static const struct file_operations supported_enctypes_ops = {
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.open = supported_enctypes_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
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static const struct file_operations pool_stats_operations = {
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.open = nfsd_pool_stats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = nfsd_pool_stats_release,
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};
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static const struct file_operations reply_cache_stats_operations = {
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.open = nfsd_reply_cache_stats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/*----------------------------------------------------------------------------*/
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/*
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* payload - write methods
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*/
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static inline struct net *netns(struct file *file)
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{
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return file_inode(file)->i_sb->s_fs_info;
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}
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/**
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* write_unlock_ip - Release all locks used by a client
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*
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* Experimental.
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*
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* Input:
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* buf: '\n'-terminated C string containing a
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* presentation format IP address
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* size: length of C string in @buf
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* Output:
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* On success: returns zero if all specified locks were released;
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* returns one if one or more locks were not released
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* On error: return code is negative errno value
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*/
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static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
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{
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struct sockaddr_storage address;
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struct sockaddr *sap = (struct sockaddr *)&address;
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size_t salen = sizeof(address);
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char *fo_path;
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struct net *net = netns(file);
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/* sanity check */
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if (size == 0)
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return -EINVAL;
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if (buf[size-1] != '\n')
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return -EINVAL;
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fo_path = buf;
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if (qword_get(&buf, fo_path, size) < 0)
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return -EINVAL;
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if (rpc_pton(net, fo_path, size, sap, salen) == 0)
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return -EINVAL;
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return nlmsvc_unlock_all_by_ip(sap);
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}
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/**
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* write_unlock_fs - Release all locks on a local file system
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*
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* Experimental.
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*
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* Input:
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* buf: '\n'-terminated C string containing the
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* absolute pathname of a local file system
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* size: length of C string in @buf
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* Output:
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* On success: returns zero if all specified locks were released;
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* returns one if one or more locks were not released
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* On error: return code is negative errno value
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*/
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static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
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{
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struct path path;
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char *fo_path;
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int error;
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/* sanity check */
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if (size == 0)
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return -EINVAL;
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if (buf[size-1] != '\n')
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return -EINVAL;
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fo_path = buf;
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if (qword_get(&buf, fo_path, size) < 0)
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return -EINVAL;
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error = kern_path(fo_path, 0, &path);
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if (error)
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return error;
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/*
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* XXX: Needs better sanity checking. Otherwise we could end up
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* releasing locks on the wrong file system.
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*
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* For example:
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* 1. Does the path refer to a directory?
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* 2. Is that directory a mount point, or
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* 3. Is that directory the root of an exported file system?
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*/
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error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
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path_put(&path);
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return error;
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}
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/**
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* write_filehandle - Get a variable-length NFS file handle by path
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*
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* On input, the buffer contains a '\n'-terminated C string comprised of
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* three alphanumeric words separated by whitespace. The string may
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* contain escape sequences.
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*
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* Input:
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* buf:
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* domain: client domain name
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* path: export pathname
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* maxsize: numeric maximum size of
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* @buf
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* size: length of C string in @buf
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* Output:
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* On success: passed-in buffer filled with '\n'-terminated C
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* string containing a ASCII hex text version
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* of the NFS file handle;
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* return code is the size in bytes of the string
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* On error: return code is negative errno value
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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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char *dname, *path;
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int uninitialized_var(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 (size == 0)
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return -EINVAL;
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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)
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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)
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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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maxsize = min(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(netns(file), 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;
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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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|
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/**
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* write_threads - Start NFSD, or report the current number of running threads
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*
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* Input:
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* buf: ignored
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* size: zero
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* Output:
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* On success: passed-in buffer filled with '\n'-terminated C
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* string numeric value representing the number of
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* running NFSD threads;
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* return code is the size in bytes of the string
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* On error: return code is zero
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*
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* OR
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*
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* Input:
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* buf: C string containing an unsigned
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* integer value representing the
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* number of NFSD threads to start
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* size: non-zero length of C string in @buf
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* Output:
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* On success: NFS service is started;
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* passed-in buffer filled with '\n'-terminated C
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* string numeric value representing the number of
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* running NFSD threads;
|
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* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
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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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char *mesg = buf;
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int rv;
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struct net *net = netns(file);
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|
|
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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;
|
|
if (newthreads < 0)
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return -EINVAL;
|
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rv = nfsd_svc(newthreads, net, file->f_cred);
|
|
if (rv < 0)
|
|
return rv;
|
|
} else
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rv = nfsd_nrthreads(net);
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|
|
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return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
|
|
}
|
|
|
|
/**
|
|
* write_pool_threads - Set or report the current number of threads per pool
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing whitespace-
|
|
* separated unsigned integer values
|
|
* representing the number of NFSD
|
|
* threads to start in each pool
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C
|
|
* string containing integer values representing the
|
|
* number of NFSD threads in each pool;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
|
|
{
|
|
/* if size > 0, look for an array of number of threads per node
|
|
* and apply them then write out number of threads per node as reply
|
|
*/
|
|
char *mesg = buf;
|
|
int i;
|
|
int rv;
|
|
int len;
|
|
int npools;
|
|
int *nthreads;
|
|
struct net *net = netns(file);
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
npools = nfsd_nrpools(net);
|
|
if (npools == 0) {
|
|
/*
|
|
* NFS is shut down. The admin can start it by
|
|
* writing to the threads file but NOT the pool_threads
|
|
* file, sorry. Report zero threads.
|
|
*/
|
|
mutex_unlock(&nfsd_mutex);
|
|
strcpy(buf, "0\n");
|
|
return strlen(buf);
|
|
}
|
|
|
|
nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
|
|
rv = -ENOMEM;
|
|
if (nthreads == NULL)
|
|
goto out_free;
|
|
|
|
if (size > 0) {
|
|
for (i = 0; i < npools; i++) {
|
|
rv = get_int(&mesg, &nthreads[i]);
|
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if (rv == -ENOENT)
|
|
break; /* fewer numbers than pools */
|
|
if (rv)
|
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goto out_free; /* syntax error */
|
|
rv = -EINVAL;
|
|
if (nthreads[i] < 0)
|
|
goto out_free;
|
|
}
|
|
rv = nfsd_set_nrthreads(i, nthreads, net);
|
|
if (rv)
|
|
goto out_free;
|
|
}
|
|
|
|
rv = nfsd_get_nrthreads(npools, nthreads, net);
|
|
if (rv)
|
|
goto out_free;
|
|
|
|
mesg = buf;
|
|
size = SIMPLE_TRANSACTION_LIMIT;
|
|
for (i = 0; i < npools && size > 0; i++) {
|
|
snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
|
|
len = strlen(mesg);
|
|
size -= len;
|
|
mesg += len;
|
|
}
|
|
rv = mesg - buf;
|
|
out_free:
|
|
kfree(nthreads);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return rv;
|
|
}
|
|
|
|
static ssize_t
|
|
nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
|
|
const char *sep, unsigned vers, int minor)
|
|
{
|
|
const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
|
|
bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
|
|
|
|
if (vers == 4 && minor >= 0 &&
|
|
!nfsd_minorversion(nn, minor, NFSD_TEST))
|
|
supported = false;
|
|
if (minor == 0 && supported)
|
|
/*
|
|
* special case for backward compatability.
|
|
* +4.0 is never reported, it is implied by
|
|
* +4, unless -4.0 is present.
|
|
*/
|
|
return 0;
|
|
return snprintf(buf, remaining, format, sep,
|
|
supported ? '+' : '-', vers, minor);
|
|
}
|
|
|
|
static ssize_t __write_versions(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *mesg = buf;
|
|
char *vers, *minorp, sign;
|
|
int len, num, remaining;
|
|
ssize_t tlen = 0;
|
|
char *sep;
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
|
|
if (size>0) {
|
|
if (nn->nfsd_serv)
|
|
/* Cannot change versions without updating
|
|
* nn->nfsd_serv->sv_xdrsize, and reallocing
|
|
* rq_argp and rq_resp
|
|
*/
|
|
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 {
|
|
enum vers_op cmd;
|
|
unsigned minor;
|
|
sign = *vers;
|
|
if (sign == '+' || sign == '-')
|
|
num = simple_strtol((vers+1), &minorp, 0);
|
|
else
|
|
num = simple_strtol(vers, &minorp, 0);
|
|
if (*minorp == '.') {
|
|
if (num != 4)
|
|
return -EINVAL;
|
|
if (kstrtouint(minorp+1, 0, &minor) < 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
|
|
switch(num) {
|
|
case 2:
|
|
case 3:
|
|
nfsd_vers(nn, num, cmd);
|
|
break;
|
|
case 4:
|
|
if (*minorp == '.') {
|
|
if (nfsd_minorversion(nn, minor, cmd) < 0)
|
|
return -EINVAL;
|
|
} else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
|
|
/*
|
|
* Either we have +4 and no minors are enabled,
|
|
* or we have -4 and at least one minor is enabled.
|
|
* In either case, propagate 'cmd' to all minors.
|
|
*/
|
|
minor = 0;
|
|
while (nfsd_minorversion(nn, minor, cmd) >= 0)
|
|
minor++;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
vers += len + 1;
|
|
} while ((len = qword_get(&mesg, vers, size)) > 0);
|
|
/* If all get turned off, turn them back on, as
|
|
* having no versions is BAD
|
|
*/
|
|
nfsd_reset_versions(nn);
|
|
}
|
|
|
|
/* Now write current state into reply buffer */
|
|
len = 0;
|
|
sep = "";
|
|
remaining = SIMPLE_TRANSACTION_LIMIT;
|
|
for (num=2 ; num <= 4 ; num++) {
|
|
int minor;
|
|
if (!nfsd_vers(nn, num, NFSD_AVAIL))
|
|
continue;
|
|
|
|
minor = -1;
|
|
do {
|
|
len = nfsd_print_version_support(nn, buf, remaining,
|
|
sep, num, minor);
|
|
if (len >= remaining)
|
|
goto out;
|
|
remaining -= len;
|
|
buf += len;
|
|
tlen += len;
|
|
minor++;
|
|
if (len)
|
|
sep = " ";
|
|
} while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
|
|
}
|
|
out:
|
|
len = snprintf(buf, remaining, "\n");
|
|
if (len >= remaining)
|
|
return -EINVAL;
|
|
return tlen + len;
|
|
}
|
|
|
|
/**
|
|
* write_versions - Set or report the available NFS protocol versions
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C
|
|
* string containing positive or negative integer
|
|
* values representing the current status of each
|
|
* protocol version;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing whitespace-
|
|
* separated positive or negative
|
|
* integer values representing NFS
|
|
* protocol versions to enable ("+n")
|
|
* or disable ("-n")
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: status of zero or more protocol versions has
|
|
* been updated; passed-in buffer filled with
|
|
* '\n'-terminated C string containing positive
|
|
* or negative integer values representing the
|
|
* current status of each protocol version;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_versions(struct file *file, char *buf, size_t size)
|
|
{
|
|
ssize_t rv;
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
rv = __write_versions(file, buf, size);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* Zero-length write. Return a list of NFSD's current listener
|
|
* transports.
|
|
*/
|
|
static ssize_t __write_ports_names(char *buf, struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (nn->nfsd_serv == NULL)
|
|
return 0;
|
|
return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
|
|
}
|
|
|
|
/*
|
|
* A single 'fd' number was written, in which case it must be for
|
|
* a socket of a supported family/protocol, and we use it as an
|
|
* nfsd listener.
|
|
*/
|
|
static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
|
|
{
|
|
char *mesg = buf;
|
|
int fd, err;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
err = get_int(&mesg, &fd);
|
|
if (err != 0 || fd < 0)
|
|
return -EINVAL;
|
|
|
|
if (svc_alien_sock(net, fd)) {
|
|
printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = nfsd_create_serv(net);
|
|
if (err != 0)
|
|
return err;
|
|
|
|
err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
|
|
if (err < 0) {
|
|
nfsd_destroy(net);
|
|
return err;
|
|
}
|
|
|
|
/* Decrease the count, but don't shut down the service */
|
|
nn->nfsd_serv->sv_nrthreads--;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* A transport listener is added by writing it's transport name and
|
|
* a port number.
|
|
*/
|
|
static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
|
|
{
|
|
char transport[16];
|
|
struct svc_xprt *xprt;
|
|
int port, err;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
if (sscanf(buf, "%15s %5u", transport, &port) != 2)
|
|
return -EINVAL;
|
|
|
|
if (port < 1 || port > USHRT_MAX)
|
|
return -EINVAL;
|
|
|
|
err = nfsd_create_serv(net);
|
|
if (err != 0)
|
|
return err;
|
|
|
|
err = svc_create_xprt(nn->nfsd_serv, transport, net,
|
|
PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
|
|
if (err < 0)
|
|
goto out_err;
|
|
|
|
err = svc_create_xprt(nn->nfsd_serv, transport, net,
|
|
PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
|
|
if (err < 0 && err != -EAFNOSUPPORT)
|
|
goto out_close;
|
|
|
|
/* Decrease the count, but don't shut down the service */
|
|
nn->nfsd_serv->sv_nrthreads--;
|
|
return 0;
|
|
out_close:
|
|
xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
|
|
if (xprt != NULL) {
|
|
svc_close_xprt(xprt);
|
|
svc_xprt_put(xprt);
|
|
}
|
|
out_err:
|
|
nfsd_destroy(net);
|
|
return err;
|
|
}
|
|
|
|
static ssize_t __write_ports(struct file *file, char *buf, size_t size,
|
|
struct net *net)
|
|
{
|
|
if (size == 0)
|
|
return __write_ports_names(buf, net);
|
|
|
|
if (isdigit(buf[0]))
|
|
return __write_ports_addfd(buf, net, file->f_cred);
|
|
|
|
if (isalpha(buf[0]))
|
|
return __write_ports_addxprt(buf, net, file->f_cred);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* write_ports - Pass a socket file descriptor or transport name to listen on
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
* Output:
|
|
* On success: passed-in buffer filled with a '\n'-terminated C
|
|
* string containing a whitespace-separated list of
|
|
* named NFSD listeners;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing an unsigned
|
|
* integer value representing a bound
|
|
* but unconnected socket that is to be
|
|
* used as an NFSD listener; listen(3)
|
|
* must be called for a SOCK_STREAM
|
|
* socket, otherwise it is ignored
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: NFS service is started;
|
|
* passed-in buffer filled with a '\n'-terminated C
|
|
* string containing a unique alphanumeric name of
|
|
* the listener;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is a negative errno value
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing a transport
|
|
* name and an unsigned integer value
|
|
* representing the port to listen on,
|
|
* separated by whitespace
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: returns zero; NFS service is started
|
|
* On error: return code is a negative errno value
|
|
*/
|
|
static ssize_t write_ports(struct file *file, char *buf, size_t size)
|
|
{
|
|
ssize_t rv;
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
rv = __write_ports(file, buf, size, netns(file));
|
|
mutex_unlock(&nfsd_mutex);
|
|
return rv;
|
|
}
|
|
|
|
|
|
int nfsd_max_blksize;
|
|
|
|
/**
|
|
* write_maxblksize - Set or report the current NFS blksize
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing an unsigned
|
|
* integer value representing the new
|
|
* NFS blksize
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C string
|
|
* containing numeric value of the current NFS blksize
|
|
* setting;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *mesg = buf;
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
|
|
if (size > 0) {
|
|
int bsize;
|
|
int rv = get_int(&mesg, &bsize);
|
|
if (rv)
|
|
return rv;
|
|
/* force bsize into allowed range and
|
|
* required alignment.
|
|
*/
|
|
bsize = max_t(int, bsize, 1024);
|
|
bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
|
|
bsize &= ~(1024-1);
|
|
mutex_lock(&nfsd_mutex);
|
|
if (nn->nfsd_serv) {
|
|
mutex_unlock(&nfsd_mutex);
|
|
return -EBUSY;
|
|
}
|
|
nfsd_max_blksize = bsize;
|
|
mutex_unlock(&nfsd_mutex);
|
|
}
|
|
|
|
return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
|
|
nfsd_max_blksize);
|
|
}
|
|
|
|
/**
|
|
* write_maxconn - Set or report the current max number of connections
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing an unsigned
|
|
* integer value representing the new
|
|
* number of max connections
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C string
|
|
* containing numeric value of max_connections setting
|
|
* for this net namespace;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *mesg = buf;
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
unsigned int maxconn = nn->max_connections;
|
|
|
|
if (size > 0) {
|
|
int rv = get_uint(&mesg, &maxconn);
|
|
|
|
if (rv)
|
|
return rv;
|
|
nn->max_connections = maxconn;
|
|
}
|
|
|
|
return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
|
|
}
|
|
|
|
#ifdef CONFIG_NFSD_V4
|
|
static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
|
|
time_t *time, struct nfsd_net *nn)
|
|
{
|
|
char *mesg = buf;
|
|
int rv, i;
|
|
|
|
if (size > 0) {
|
|
if (nn->nfsd_serv)
|
|
return -EBUSY;
|
|
rv = get_int(&mesg, &i);
|
|
if (rv)
|
|
return rv;
|
|
/*
|
|
* Some sanity checking. We don't have a reason for
|
|
* these particular numbers, but problems with the
|
|
* extremes are:
|
|
* - Too short: the briefest network outage may
|
|
* cause clients to lose all their locks. Also,
|
|
* the frequent polling may be wasteful.
|
|
* - Too long: do you really want reboot recovery
|
|
* to take more than an hour? Or to make other
|
|
* clients wait an hour before being able to
|
|
* revoke a dead client's locks?
|
|
*/
|
|
if (i < 10 || i > 3600)
|
|
return -EINVAL;
|
|
*time = i;
|
|
}
|
|
|
|
return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
|
|
}
|
|
|
|
static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
|
|
time_t *time, struct nfsd_net *nn)
|
|
{
|
|
ssize_t rv;
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
rv = __nfsd4_write_time(file, buf, size, time, nn);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* write_leasetime - Set or report the current NFSv4 lease time
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing an unsigned
|
|
* integer value representing the new
|
|
* NFSv4 lease expiry time
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C
|
|
* string containing unsigned integer value of the
|
|
* current lease expiry time;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
|
|
{
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
|
|
}
|
|
|
|
/**
|
|
* write_gracetime - Set or report current NFSv4 grace period time
|
|
*
|
|
* As above, but sets the time of the NFSv4 grace period.
|
|
*
|
|
* Note this should never be set to less than the *previous*
|
|
* lease-period time, but we don't try to enforce this. (In the common
|
|
* case (a new boot), we don't know what the previous lease time was
|
|
* anyway.)
|
|
*/
|
|
static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
|
|
{
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
|
|
}
|
|
|
|
static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
|
|
struct nfsd_net *nn)
|
|
{
|
|
char *mesg = buf;
|
|
char *recdir;
|
|
int len, status;
|
|
|
|
if (size > 0) {
|
|
if (nn->nfsd_serv)
|
|
return -EBUSY;
|
|
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);
|
|
if (status)
|
|
return status;
|
|
}
|
|
|
|
return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
|
|
nfs4_recoverydir());
|
|
}
|
|
|
|
/**
|
|
* write_recoverydir - Set or report the pathname of the recovery directory
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
*
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: C string containing the pathname
|
|
* of the directory on a local file
|
|
* system containing permanent NFSv4
|
|
* recovery data
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* On success: passed-in buffer filled with '\n'-terminated C string
|
|
* containing the current recovery pathname setting;
|
|
* return code is the size in bytes of the string
|
|
* On error: return code is zero or a negative errno value
|
|
*/
|
|
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
|
|
{
|
|
ssize_t rv;
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
|
|
mutex_lock(&nfsd_mutex);
|
|
rv = __write_recoverydir(file, buf, size, nn);
|
|
mutex_unlock(&nfsd_mutex);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* write_v4_end_grace - release grace period for nfsd's v4.x lock manager
|
|
*
|
|
* Input:
|
|
* buf: ignored
|
|
* size: zero
|
|
* OR
|
|
*
|
|
* Input:
|
|
* buf: any value
|
|
* size: non-zero length of C string in @buf
|
|
* Output:
|
|
* passed-in buffer filled with "Y" or "N" with a newline
|
|
* and NULL-terminated C string. This indicates whether
|
|
* the grace period has ended in the current net
|
|
* namespace. Return code is the size in bytes of the
|
|
* string. Writing a string that starts with 'Y', 'y', or
|
|
* '1' to the file will end the grace period for nfsd's v4
|
|
* lock manager.
|
|
*/
|
|
static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
|
|
{
|
|
struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
|
|
|
|
if (size > 0) {
|
|
switch(buf[0]) {
|
|
case 'Y':
|
|
case 'y':
|
|
case '1':
|
|
if (!nn->nfsd_serv)
|
|
return -EBUSY;
|
|
nfsd4_end_grace(nn);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
|
|
nn->grace_ended ? 'Y' : 'N');
|
|
}
|
|
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/*
|
|
* populating the filesystem.
|
|
*/
|
|
|
|
/* Basically copying rpc_get_inode. */
|
|
static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
|
|
{
|
|
struct inode *inode = new_inode(sb);
|
|
if (!inode)
|
|
return NULL;
|
|
/* Following advice from simple_fill_super documentation: */
|
|
inode->i_ino = iunique(sb, NFSD_MaxReserved);
|
|
inode->i_mode = mode;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
|
|
switch (mode & S_IFMT) {
|
|
case S_IFDIR:
|
|
inode->i_fop = &simple_dir_operations;
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inc_nlink(inode);
|
|
default:
|
|
break;
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = nfsd_get_inode(dir->i_sb, mode);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
if (ncl) {
|
|
inode->i_private = ncl;
|
|
kref_get(&ncl->cl_ref);
|
|
}
|
|
d_add(dentry, inode);
|
|
inc_nlink(dir);
|
|
fsnotify_mkdir(dir, dentry);
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
|
|
{
|
|
struct inode *dir = parent->d_inode;
|
|
struct dentry *dentry;
|
|
int ret = -ENOMEM;
|
|
|
|
inode_lock(dir);
|
|
dentry = d_alloc_name(parent, name);
|
|
if (!dentry)
|
|
goto out_err;
|
|
ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
|
|
if (ret)
|
|
goto out_err;
|
|
out:
|
|
inode_unlock(dir);
|
|
return dentry;
|
|
out_err:
|
|
dput(dentry);
|
|
dentry = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
static void clear_ncl(struct inode *inode)
|
|
{
|
|
struct nfsdfs_client *ncl = inode->i_private;
|
|
|
|
inode->i_private = NULL;
|
|
kref_put(&ncl->cl_ref, ncl->cl_release);
|
|
}
|
|
|
|
static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
|
|
{
|
|
struct nfsdfs_client *nc = inode->i_private;
|
|
|
|
if (nc)
|
|
kref_get(&nc->cl_ref);
|
|
return nc;
|
|
}
|
|
|
|
struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
|
|
{
|
|
struct nfsdfs_client *nc;
|
|
|
|
inode_lock_shared(inode);
|
|
nc = __get_nfsdfs_client(inode);
|
|
inode_unlock_shared(inode);
|
|
return nc;
|
|
}
|
|
/* from __rpc_unlink */
|
|
static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int ret;
|
|
|
|
clear_ncl(d_inode(dentry));
|
|
dget(dentry);
|
|
ret = simple_unlink(dir, dentry);
|
|
d_delete(dentry);
|
|
dput(dentry);
|
|
WARN_ON_ONCE(ret);
|
|
}
|
|
|
|
static void nfsdfs_remove_files(struct dentry *root)
|
|
{
|
|
struct dentry *dentry, *tmp;
|
|
|
|
list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
|
|
if (!simple_positive(dentry)) {
|
|
WARN_ON_ONCE(1); /* I think this can't happen? */
|
|
continue;
|
|
}
|
|
nfsdfs_remove_file(d_inode(root), dentry);
|
|
}
|
|
}
|
|
|
|
/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
|
|
* code instead. */
|
|
static int nfsdfs_create_files(struct dentry *root,
|
|
const struct tree_descr *files)
|
|
{
|
|
struct inode *dir = d_inode(root);
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
int i;
|
|
|
|
inode_lock(dir);
|
|
for (i = 0; files->name && files->name[0]; i++, files++) {
|
|
if (!files->name)
|
|
continue;
|
|
dentry = d_alloc_name(root, files->name);
|
|
if (!dentry)
|
|
goto out;
|
|
inode = nfsd_get_inode(d_inode(root)->i_sb,
|
|
S_IFREG | files->mode);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
goto out;
|
|
}
|
|
inode->i_fop = files->ops;
|
|
inode->i_private = __get_nfsdfs_client(dir);
|
|
d_add(dentry, inode);
|
|
fsnotify_create(dir, dentry);
|
|
}
|
|
inode_unlock(dir);
|
|
return 0;
|
|
out:
|
|
nfsdfs_remove_files(root);
|
|
inode_unlock(dir);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* on success, returns positive number unique to that client. */
|
|
struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
|
|
struct nfsdfs_client *ncl, u32 id,
|
|
const struct tree_descr *files)
|
|
{
|
|
struct dentry *dentry;
|
|
char name[11];
|
|
int ret;
|
|
|
|
sprintf(name, "%u", id);
|
|
|
|
dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
|
|
if (IS_ERR(dentry)) /* XXX: tossing errors? */
|
|
return NULL;
|
|
ret = nfsdfs_create_files(dentry, files);
|
|
if (ret) {
|
|
nfsd_client_rmdir(dentry);
|
|
return NULL;
|
|
}
|
|
return dentry;
|
|
}
|
|
|
|
/* Taken from __rpc_rmdir: */
|
|
void nfsd_client_rmdir(struct dentry *dentry)
|
|
{
|
|
struct inode *dir = d_inode(dentry->d_parent);
|
|
struct inode *inode = d_inode(dentry);
|
|
int ret;
|
|
|
|
inode_lock(dir);
|
|
nfsdfs_remove_files(dentry);
|
|
clear_ncl(inode);
|
|
dget(dentry);
|
|
ret = simple_rmdir(dir, dentry);
|
|
WARN_ON_ONCE(ret);
|
|
d_delete(dentry);
|
|
inode_unlock(dir);
|
|
}
|
|
|
|
static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
|
|
nfsd_net_id);
|
|
struct dentry *dentry;
|
|
int ret;
|
|
|
|
static const struct tree_descr nfsd_files[] = {
|
|
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
|
|
[NFSD_Export_features] = {"export_features",
|
|
&export_features_operations, S_IRUGO},
|
|
[NFSD_FO_UnlockIP] = {"unlock_ip",
|
|
&transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_FO_UnlockFS] = {"unlock_filesystem",
|
|
&transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
|
|
[NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
|
|
[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
|
|
[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
|
|
[NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
|
|
#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
|
|
[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
|
|
#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
|
|
#ifdef CONFIG_NFSD_V4
|
|
[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
|
|
[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
|
|
#endif
|
|
/* last one */ {""}
|
|
};
|
|
|
|
ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
|
|
if (ret)
|
|
return ret;
|
|
dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
nn->nfsd_client_dir = dentry;
|
|
return 0;
|
|
}
|
|
|
|
static int nfsd_fs_get_tree(struct fs_context *fc)
|
|
{
|
|
fc->s_fs_info = get_net(fc->net_ns);
|
|
return vfs_get_super(fc, vfs_get_keyed_super, nfsd_fill_super);
|
|
}
|
|
|
|
static void nfsd_fs_free_fc(struct fs_context *fc)
|
|
{
|
|
if (fc->s_fs_info)
|
|
put_net(fc->s_fs_info);
|
|
}
|
|
|
|
static const struct fs_context_operations nfsd_fs_context_ops = {
|
|
.free = nfsd_fs_free_fc,
|
|
.get_tree = nfsd_fs_get_tree,
|
|
};
|
|
|
|
static int nfsd_init_fs_context(struct fs_context *fc)
|
|
{
|
|
put_user_ns(fc->user_ns);
|
|
fc->user_ns = get_user_ns(fc->net_ns->user_ns);
|
|
fc->ops = &nfsd_fs_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
static void nfsd_umount(struct super_block *sb)
|
|
{
|
|
struct net *net = sb->s_fs_info;
|
|
|
|
kill_litter_super(sb);
|
|
put_net(net);
|
|
}
|
|
|
|
static struct file_system_type nfsd_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "nfsd",
|
|
.init_fs_context = nfsd_init_fs_context,
|
|
.kill_sb = nfsd_umount,
|
|
};
|
|
MODULE_ALIAS_FS("nfsd");
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int create_proc_exports_entry(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
entry = proc_mkdir("fs/nfs", NULL);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
entry = proc_create("exports", 0, entry,
|
|
&exports_proc_operations);
|
|
if (!entry) {
|
|
remove_proc_entry("fs/nfs", NULL);
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_PROC_FS */
|
|
static int create_proc_exports_entry(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
unsigned int nfsd_net_id;
|
|
|
|
static __net_init int nfsd_init_net(struct net *net)
|
|
{
|
|
int retval;
|
|
struct vfsmount *mnt;
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
retval = nfsd_export_init(net);
|
|
if (retval)
|
|
goto out_export_error;
|
|
retval = nfsd_idmap_init(net);
|
|
if (retval)
|
|
goto out_idmap_error;
|
|
nn->nfsd_versions = NULL;
|
|
nn->nfsd4_minorversions = NULL;
|
|
retval = nfsd_reply_cache_init(nn);
|
|
if (retval)
|
|
goto out_drc_error;
|
|
nn->nfsd4_lease = 90; /* default lease time */
|
|
nn->nfsd4_grace = 90;
|
|
nn->somebody_reclaimed = false;
|
|
nn->track_reclaim_completes = false;
|
|
nn->clverifier_counter = prandom_u32();
|
|
nn->clientid_base = prandom_u32();
|
|
nn->clientid_counter = nn->clientid_base + 1;
|
|
nn->s2s_cp_cl_id = nn->clientid_counter++;
|
|
|
|
atomic_set(&nn->ntf_refcnt, 0);
|
|
init_waitqueue_head(&nn->ntf_wq);
|
|
|
|
mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
|
|
if (IS_ERR(mnt)) {
|
|
retval = PTR_ERR(mnt);
|
|
goto out_mount_err;
|
|
}
|
|
nn->nfsd_mnt = mnt;
|
|
return 0;
|
|
|
|
out_mount_err:
|
|
nfsd_reply_cache_shutdown(nn);
|
|
out_drc_error:
|
|
nfsd_idmap_shutdown(net);
|
|
out_idmap_error:
|
|
nfsd_export_shutdown(net);
|
|
out_export_error:
|
|
return retval;
|
|
}
|
|
|
|
static __net_exit void nfsd_exit_net(struct net *net)
|
|
{
|
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
|
|
|
|
mntput(nn->nfsd_mnt);
|
|
nfsd_reply_cache_shutdown(nn);
|
|
nfsd_idmap_shutdown(net);
|
|
nfsd_export_shutdown(net);
|
|
nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
|
|
}
|
|
|
|
static struct pernet_operations nfsd_net_ops = {
|
|
.init = nfsd_init_net,
|
|
.exit = nfsd_exit_net,
|
|
.id = &nfsd_net_id,
|
|
.size = sizeof(struct nfsd_net),
|
|
};
|
|
|
|
static int __init init_nfsd(void)
|
|
{
|
|
int retval;
|
|
printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
|
|
|
|
retval = register_pernet_subsys(&nfsd_net_ops);
|
|
if (retval < 0)
|
|
return retval;
|
|
retval = register_cld_notifier();
|
|
if (retval)
|
|
goto out_unregister_pernet;
|
|
retval = nfsd4_init_slabs();
|
|
if (retval)
|
|
goto out_unregister_notifier;
|
|
retval = nfsd4_init_pnfs();
|
|
if (retval)
|
|
goto out_free_slabs;
|
|
nfsd_fault_inject_init(); /* nfsd fault injection controls */
|
|
nfsd_stat_init(); /* Statistics */
|
|
nfsd_lockd_init(); /* lockd->nfsd callbacks */
|
|
retval = create_proc_exports_entry();
|
|
if (retval)
|
|
goto out_free_lockd;
|
|
retval = register_filesystem(&nfsd_fs_type);
|
|
if (retval)
|
|
goto out_free_all;
|
|
return 0;
|
|
out_free_all:
|
|
remove_proc_entry("fs/nfs/exports", NULL);
|
|
remove_proc_entry("fs/nfs", NULL);
|
|
out_free_lockd:
|
|
nfsd_lockd_shutdown();
|
|
nfsd_stat_shutdown();
|
|
nfsd_fault_inject_cleanup();
|
|
nfsd4_exit_pnfs();
|
|
out_free_slabs:
|
|
nfsd4_free_slabs();
|
|
out_unregister_notifier:
|
|
unregister_cld_notifier();
|
|
out_unregister_pernet:
|
|
unregister_pernet_subsys(&nfsd_net_ops);
|
|
return retval;
|
|
}
|
|
|
|
static void __exit exit_nfsd(void)
|
|
{
|
|
remove_proc_entry("fs/nfs/exports", NULL);
|
|
remove_proc_entry("fs/nfs", NULL);
|
|
nfsd_stat_shutdown();
|
|
nfsd_lockd_shutdown();
|
|
nfsd4_free_slabs();
|
|
nfsd4_exit_pnfs();
|
|
nfsd_fault_inject_cleanup();
|
|
unregister_filesystem(&nfsd_fs_type);
|
|
unregister_cld_notifier();
|
|
unregister_pernet_subsys(&nfsd_net_ops);
|
|
}
|
|
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(init_nfsd)
|
|
module_exit(exit_nfsd)
|