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acrn-kernel/fs/nfsd/nfsctl.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Syscall interface to knfsd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/ctype.h>
#include <linux/fs_context.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/lockd/lockd.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/sunrpc/gss_krb5_enctypes.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/module.h>
#include <linux/fsnotify.h>
#include "idmap.h"
#include "nfsd.h"
#include "cache.h"
#include "state.h"
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
/*
* We have a single directory with several nodes in it.
*/
enum {
NFSD_Root = 1,
NFSD_List,
NFSD_Export_Stats,
NFSD_Export_features,
NFSD_Fh,
NFSD_FO_UnlockIP,
NFSD_FO_UnlockFS,
NFSD_Threads,
NFSD_Pool_Threads,
NFSD_Pool_Stats,
NFSD_Reply_Cache_Stats,
NFSD_Versions,
NFSD_Ports,
NFSD_MaxBlkSize,
NFSD_MaxConnections,
NFSD_Filecache,
NFSD_SupportedEnctypes,
/*
* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
*/
#ifdef CONFIG_NFSD_V4
NFSD_Leasetime,
NFSD_Gracetime,
NFSD_RecoveryDir,
NFSD_V4EndGrace,
#endif
NFSD_MaxReserved
};
/*
* write() for these nodes.
*/
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
static ssize_t write_ports(struct file *file, char *buf, size_t size);
static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
#endif
static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
[NFSD_Fh] = write_filehandle,
[NFSD_FO_UnlockIP] = write_unlock_ip,
[NFSD_FO_UnlockFS] = write_unlock_fs,
[NFSD_Threads] = write_threads,
[NFSD_Pool_Threads] = write_pool_threads,
[NFSD_Versions] = write_versions,
[NFSD_Ports] = write_ports,
[NFSD_MaxBlkSize] = write_maxblksize,
[NFSD_MaxConnections] = write_maxconn,
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = write_leasetime,
[NFSD_Gracetime] = write_gracetime,
[NFSD_RecoveryDir] = write_recoverydir,
[NFSD_V4EndGrace] = write_v4_end_grace,
#endif
};
static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
{
ino_t ino = file_inode(file)->i_ino;
char *data;
ssize_t rv;
if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
return -EINVAL;
data = simple_transaction_get(file, buf, size);
if (IS_ERR(data))
return PTR_ERR(data);
rv = write_op[ino](file, data, size);
if (rv >= 0) {
simple_transaction_set(file, rv);
rv = size;
}
return rv;
}
static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
if (! file->private_data) {
/* An attempt to read a transaction file without writing
* causes a 0-byte write so that the file can return
* state information
*/
ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
if (rv < 0)
return rv;
}
return simple_transaction_read(file, buf, size, pos);
}
static const struct file_operations transaction_ops = {
.write = nfsctl_transaction_write,
.read = nfsctl_transaction_read,
.release = simple_transaction_release,
.llseek = default_llseek,
};
static int exports_net_open(struct net *net, struct file *file)
{
int err;
struct seq_file *seq;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
err = seq_open(file, &nfs_exports_op);
if (err)
return err;
seq = file->private_data;
seq->private = nn->svc_export_cache;
return 0;
}
static int exports_proc_open(struct inode *inode, struct file *file)
{
return exports_net_open(current->nsproxy->net_ns, file);
}
static const struct proc_ops exports_proc_ops = {
.proc_open = exports_proc_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = seq_release,
};
static int exports_nfsd_open(struct inode *inode, struct file *file)
{
return exports_net_open(inode->i_sb->s_fs_info, file);
}
static const struct file_operations exports_nfsd_operations = {
.open = exports_nfsd_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int export_features_show(struct seq_file *m, void *v)
{
seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(export_features);
#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
static int supported_enctypes_show(struct seq_file *m, void *v)
{
seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(supported_enctypes);
#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
static const struct file_operations pool_stats_operations = {
.open = nfsd_pool_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = nfsd_pool_stats_release,
};
DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
/*----------------------------------------------------------------------------*/
/*
* payload - write methods
*/
static inline struct net *netns(struct file *file)
{
return file_inode(file)->i_sb->s_fs_info;
}
/*
* write_unlock_ip - Release all locks used by a client
*
* Experimental.
*
* Input:
* buf: '\n'-terminated C string containing a
* presentation format IP address
* size: length of C string in @buf
* Output:
* On success: returns zero if all specified locks were released;
* returns one if one or more locks were not released
* On error: return code is negative errno value
*/
static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
{
struct sockaddr_storage address;
struct sockaddr *sap = (struct sockaddr *)&address;
size_t salen = sizeof(address);
char *fo_path;
struct net *net = netns(file);
/* sanity check */
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
fo_path = buf;
if (qword_get(&buf, fo_path, size) < 0)
return -EINVAL;
if (rpc_pton(net, fo_path, size, sap, salen) == 0)
return -EINVAL;
return nlmsvc_unlock_all_by_ip(sap);
}
/*
* write_unlock_fs - Release all locks on a local file system
*
* Experimental.
*
* Input:
* buf: '\n'-terminated C string containing the
* absolute pathname of a local file system
* size: length of C string in @buf
* Output:
* On success: returns zero if all specified locks were released;
* returns one if one or more locks were not released
* On error: return code is negative errno value
*/
static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
{
struct path path;
char *fo_path;
int error;
/* sanity check */
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
fo_path = buf;
if (qword_get(&buf, fo_path, size) < 0)
return -EINVAL;
error = kern_path(fo_path, 0, &path);
if (error)
return error;
/*
* XXX: Needs better sanity checking. Otherwise we could end up
* releasing locks on the wrong file system.
*
* For example:
* 1. Does the path refer to a directory?
* 2. Is that directory a mount point, or
* 3. Is that directory the root of an exported file system?
*/
error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
path_put(&path);
return error;
}
/*
* write_filehandle - Get a variable-length NFS file handle by path
*
* On input, the buffer contains a '\n'-terminated C string comprised of
* three alphanumeric words separated by whitespace. The string may
* contain escape sequences.
*
* Input:
* buf:
* domain: client domain name
* path: export pathname
* maxsize: numeric maximum size of
* @buf
* size: length of C string in @buf
* Output:
* On success: passed-in buffer filled with '\n'-terminated C
* string containing a ASCII hex text version
* of the NFS file handle;
* return code is the size in bytes of the string
* On error: return code is negative errno value
*/
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
char *dname, *path;
int maxsize;
char *mesg = buf;
int len;
struct auth_domain *dom;
struct knfsd_fh fh;
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
dname = mesg;
len = qword_get(&mesg, dname, size);
if (len <= 0)
return -EINVAL;
path = dname+len+1;
len = qword_get(&mesg, path, size);
if (len <= 0)
return -EINVAL;
len = get_int(&mesg, &maxsize);
if (len)
return len;
if (maxsize < NFS_FHSIZE)
return -EINVAL;
maxsize = min(maxsize, NFS3_FHSIZE);
if (qword_get(&mesg, mesg, size)>0)
return -EINVAL;
/* we have all the words, they are in buf.. */
dom = unix_domain_find(dname);
if (!dom)
return -ENOMEM;
len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
auth_domain_put(dom);
if (len)
return len;
mesg = buf;
len = SIMPLE_TRANSACTION_LIMIT;
qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
mesg[-1] = '\n';
return mesg - buf;
}
/*
* write_threads - Start NFSD, or report the current number of running threads
*
* Input:
* buf: ignored
* size: zero
* Output:
* On success: passed-in buffer filled with '\n'-terminated C
* string numeric value representing the number of
* running NFSD threads;
* return code is the size in bytes of the string
* On error: return code is zero
*
* OR
*
* Input:
* buf: C string containing an unsigned
* integer value representing the
* number of NFSD threads to start
* size: non-zero length of C string in @buf
* Output:
* On success: NFS service is started;
* passed-in buffer filled with '\n'-terminated C
* string numeric value representing the number of
* running NFSD threads;
* 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_threads(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
int rv;
struct net *net = netns(file);
if (size > 0) {
int newthreads;
rv = get_int(&mesg, &newthreads);
if (rv)
return rv;
if (newthreads < 0)
return -EINVAL;
rv = nfsd_svc(newthreads, net, file->f_cred);
if (rv < 0)
return rv;
} else
rv = nfsd_nrthreads(net);
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]);
if (rv == -ENOENT)
break; /* fewer numbers than pools */
if (rv)
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 */
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;
err = nfsd_create_serv(net);
if (err != 0)
return err;
err = svc_addsock(nn->nfsd_serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
if (err >= 0 &&
!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
svc_get(nn->nfsd_serv);
nfsd_put(net);
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_xprt_create(nn->nfsd_serv, transport, net,
PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
if (err < 0)
goto out_err;
err = svc_xprt_create(nn->nfsd_serv, transport, net,
PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
if (err < 0 && err != -EAFNOSUPPORT)
goto out_close;
if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
svc_get(nn->nfsd_serv);
nfsd_put(net);
return 0;
out_close:
xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
if (xprt != NULL) {
svc_xprt_close(xprt);
svc_xprt_put(xprt);
}
out_err:
nfsd_put(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,
time64_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, "%lld\n", *time);
}
static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
time64_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);
break;
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_drop(dentry);
fsnotify_unlink(dir, 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 dentry **fdentries)
{
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++) {
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);
if (fdentries)
fdentries[i] = 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 **fdentries)
{
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, fdentries);
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_drop(dentry);
fsnotify_rmdir(dir, dentry);
dput(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},
/* Per-export io stats use same ops as exports file */
[NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
&export_features_fops, 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",
&nfsd_reply_cache_stats_fops, 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},
[NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
[NFSD_SupportedEnctypes] = {"supported_krb5_enctypes",
&supported_enctypes_fops, 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)
{
return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
}
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;
nfsd_shutdown_threads(net);
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_ops);
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 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 = nfsd4_init_leases_net(nn);
if (retval)
goto out_drc_error;
retval = nfsd_reply_cache_init(nn);
if (retval)
goto out_cache_error;
get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
seqlock_init(&nn->writeverf_lock);
return 0;
out_cache_error:
nfsd4_leases_net_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);
nfsd_reply_cache_shutdown(nn);
nfsd_idmap_shutdown(net);
nfsd_export_shutdown(net);
nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
nfsd4_leases_net_shutdown(nn);
}
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;
retval = nfsd4_init_slabs();
if (retval)
return retval;
retval = nfsd4_init_pnfs();
if (retval)
goto out_free_slabs;
retval = nfsd_stat_init(); /* Statistics */
if (retval)
goto out_free_pnfs;
retval = nfsd_drc_slab_create();
if (retval)
goto out_free_stat;
nfsd_lockd_init(); /* lockd->nfsd callbacks */
retval = create_proc_exports_entry();
if (retval)
goto out_free_lockd;
retval = register_pernet_subsys(&nfsd_net_ops);
if (retval < 0)
goto out_free_exports;
retval = register_cld_notifier();
if (retval)
goto out_free_subsys;
retval = nfsd4_create_laundry_wq();
if (retval)
goto out_free_cld;
retval = register_filesystem(&nfsd_fs_type);
if (retval)
goto out_free_all;
return 0;
out_free_all:
nfsd4_destroy_laundry_wq();
out_free_cld:
unregister_cld_notifier();
out_free_subsys:
unregister_pernet_subsys(&nfsd_net_ops);
out_free_exports:
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
out_free_lockd:
nfsd_lockd_shutdown();
nfsd_drc_slab_free();
out_free_stat:
nfsd_stat_shutdown();
out_free_pnfs:
nfsd4_exit_pnfs();
out_free_slabs:
nfsd4_free_slabs();
return retval;
}
static void __exit exit_nfsd(void)
{
unregister_filesystem(&nfsd_fs_type);
nfsd4_destroy_laundry_wq();
unregister_cld_notifier();
unregister_pernet_subsys(&nfsd_net_ops);
nfsd_drc_slab_free();
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();
}
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfsd)
module_exit(exit_nfsd)
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