1 // SPDX-License-Identifier: GPL-2.0-only
3 * Syscall interface to knfsd.
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 #include <linux/slab.h>
9 #include <linux/namei.h>
10 #include <linux/ctype.h>
11 #include <linux/fs_context.h>
13 #include <linux/sunrpc/svcsock.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/sunrpc/addr.h>
16 #include <linux/sunrpc/gss_api.h>
17 #include <linux/sunrpc/gss_krb5_enctypes.h>
18 #include <linux/sunrpc/rpc_pipe_fs.h>
19 #include <linux/module.h>
20 #include <linux/fsnotify.h>
30 * We have a single directory with several nodes in it.
43 NFSD_Reply_Cache_Stats
,
48 NFSD_SupportedEnctypes
,
50 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
51 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
63 * write() for these nodes.
65 static ssize_t
write_filehandle(struct file
*file
, char *buf
, size_t size
);
66 static ssize_t
write_unlock_ip(struct file
*file
, char *buf
, size_t size
);
67 static ssize_t
write_unlock_fs(struct file
*file
, char *buf
, size_t size
);
68 static ssize_t
write_threads(struct file
*file
, char *buf
, size_t size
);
69 static ssize_t
write_pool_threads(struct file
*file
, char *buf
, size_t size
);
70 static ssize_t
write_versions(struct file
*file
, char *buf
, size_t size
);
71 static ssize_t
write_ports(struct file
*file
, char *buf
, size_t size
);
72 static ssize_t
write_maxblksize(struct file
*file
, char *buf
, size_t size
);
73 static ssize_t
write_maxconn(struct file
*file
, char *buf
, size_t size
);
75 static ssize_t
write_leasetime(struct file
*file
, char *buf
, size_t size
);
76 static ssize_t
write_gracetime(struct file
*file
, char *buf
, size_t size
);
77 static ssize_t
write_recoverydir(struct file
*file
, char *buf
, size_t size
);
78 static ssize_t
write_v4_end_grace(struct file
*file
, char *buf
, size_t size
);
81 static ssize_t (*const write_op
[])(struct file
*, char *, size_t) = {
82 [NFSD_Fh
] = write_filehandle
,
83 [NFSD_FO_UnlockIP
] = write_unlock_ip
,
84 [NFSD_FO_UnlockFS
] = write_unlock_fs
,
85 [NFSD_Threads
] = write_threads
,
86 [NFSD_Pool_Threads
] = write_pool_threads
,
87 [NFSD_Versions
] = write_versions
,
88 [NFSD_Ports
] = write_ports
,
89 [NFSD_MaxBlkSize
] = write_maxblksize
,
90 [NFSD_MaxConnections
] = write_maxconn
,
92 [NFSD_Leasetime
] = write_leasetime
,
93 [NFSD_Gracetime
] = write_gracetime
,
94 [NFSD_RecoveryDir
] = write_recoverydir
,
95 [NFSD_V4EndGrace
] = write_v4_end_grace
,
99 static ssize_t
nfsctl_transaction_write(struct file
*file
, const char __user
*buf
, size_t size
, loff_t
*pos
)
101 ino_t ino
= file_inode(file
)->i_ino
;
105 if (ino
>= ARRAY_SIZE(write_op
) || !write_op
[ino
])
108 data
= simple_transaction_get(file
, buf
, size
);
110 return PTR_ERR(data
);
112 rv
= write_op
[ino
](file
, data
, size
);
114 simple_transaction_set(file
, rv
);
120 static ssize_t
nfsctl_transaction_read(struct file
*file
, char __user
*buf
, size_t size
, loff_t
*pos
)
122 if (! file
->private_data
) {
123 /* An attempt to read a transaction file without writing
124 * causes a 0-byte write so that the file can return
127 ssize_t rv
= nfsctl_transaction_write(file
, buf
, 0, pos
);
131 return simple_transaction_read(file
, buf
, size
, pos
);
134 static const struct file_operations transaction_ops
= {
135 .write
= nfsctl_transaction_write
,
136 .read
= nfsctl_transaction_read
,
137 .release
= simple_transaction_release
,
138 .llseek
= default_llseek
,
141 static int exports_net_open(struct net
*net
, struct file
*file
)
144 struct seq_file
*seq
;
145 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
147 err
= seq_open(file
, &nfs_exports_op
);
151 seq
= file
->private_data
;
152 seq
->private = nn
->svc_export_cache
;
156 static int exports_proc_open(struct inode
*inode
, struct file
*file
)
158 return exports_net_open(current
->nsproxy
->net_ns
, file
);
161 static const struct proc_ops exports_proc_ops
= {
162 .proc_open
= exports_proc_open
,
163 .proc_read
= seq_read
,
164 .proc_lseek
= seq_lseek
,
165 .proc_release
= seq_release
,
168 static int exports_nfsd_open(struct inode
*inode
, struct file
*file
)
170 return exports_net_open(inode
->i_sb
->s_fs_info
, file
);
173 static const struct file_operations exports_nfsd_operations
= {
174 .open
= exports_nfsd_open
,
177 .release
= seq_release
,
180 static int export_features_show(struct seq_file
*m
, void *v
)
182 seq_printf(m
, "0x%x 0x%x\n", NFSEXP_ALLFLAGS
, NFSEXP_SECINFO_FLAGS
);
186 static int export_features_open(struct inode
*inode
, struct file
*file
)
188 return single_open(file
, export_features_show
, NULL
);
191 static const struct file_operations export_features_operations
= {
192 .open
= export_features_open
,
195 .release
= single_release
,
198 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
199 static int supported_enctypes_show(struct seq_file
*m
, void *v
)
201 seq_printf(m
, KRB5_SUPPORTED_ENCTYPES
);
205 static int supported_enctypes_open(struct inode
*inode
, struct file
*file
)
207 return single_open(file
, supported_enctypes_show
, NULL
);
210 static const struct file_operations supported_enctypes_ops
= {
211 .open
= supported_enctypes_open
,
214 .release
= single_release
,
216 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
218 static const struct file_operations pool_stats_operations
= {
219 .open
= nfsd_pool_stats_open
,
222 .release
= nfsd_pool_stats_release
,
225 static const struct file_operations reply_cache_stats_operations
= {
226 .open
= nfsd_reply_cache_stats_open
,
229 .release
= single_release
,
232 /*----------------------------------------------------------------------------*/
234 * payload - write methods
237 static inline struct net
*netns(struct file
*file
)
239 return file_inode(file
)->i_sb
->s_fs_info
;
243 * write_unlock_ip - Release all locks used by a client
248 * buf: '\n'-terminated C string containing a
249 * presentation format IP address
250 * size: length of C string in @buf
252 * On success: returns zero if all specified locks were released;
253 * returns one if one or more locks were not released
254 * On error: return code is negative errno value
256 static ssize_t
write_unlock_ip(struct file
*file
, char *buf
, size_t size
)
258 struct sockaddr_storage address
;
259 struct sockaddr
*sap
= (struct sockaddr
*)&address
;
260 size_t salen
= sizeof(address
);
262 struct net
*net
= netns(file
);
268 if (buf
[size
-1] != '\n')
272 if (qword_get(&buf
, fo_path
, size
) < 0)
275 if (rpc_pton(net
, fo_path
, size
, sap
, salen
) == 0)
278 return nlmsvc_unlock_all_by_ip(sap
);
282 * write_unlock_fs - Release all locks on a local file system
287 * buf: '\n'-terminated C string containing the
288 * absolute pathname of a local file system
289 * size: length of C string in @buf
291 * On success: returns zero if all specified locks were released;
292 * returns one if one or more locks were not released
293 * On error: return code is negative errno value
295 static ssize_t
write_unlock_fs(struct file
*file
, char *buf
, size_t size
)
305 if (buf
[size
-1] != '\n')
309 if (qword_get(&buf
, fo_path
, size
) < 0)
312 error
= kern_path(fo_path
, 0, &path
);
317 * XXX: Needs better sanity checking. Otherwise we could end up
318 * releasing locks on the wrong file system.
321 * 1. Does the path refer to a directory?
322 * 2. Is that directory a mount point, or
323 * 3. Is that directory the root of an exported file system?
325 error
= nlmsvc_unlock_all_by_sb(path
.dentry
->d_sb
);
332 * write_filehandle - Get a variable-length NFS file handle by path
334 * On input, the buffer contains a '\n'-terminated C string comprised of
335 * three alphanumeric words separated by whitespace. The string may
336 * contain escape sequences.
340 * domain: client domain name
341 * path: export pathname
342 * maxsize: numeric maximum size of
344 * size: length of C string in @buf
346 * On success: passed-in buffer filled with '\n'-terminated C
347 * string containing a ASCII hex text version
348 * of the NFS file handle;
349 * return code is the size in bytes of the string
350 * On error: return code is negative errno value
352 static ssize_t
write_filehandle(struct file
*file
, char *buf
, size_t size
)
358 struct auth_domain
*dom
;
364 if (buf
[size
-1] != '\n')
369 len
= qword_get(&mesg
, dname
, size
);
374 len
= qword_get(&mesg
, path
, size
);
378 len
= get_int(&mesg
, &maxsize
);
382 if (maxsize
< NFS_FHSIZE
)
384 maxsize
= min(maxsize
, NFS3_FHSIZE
);
386 if (qword_get(&mesg
, mesg
, size
)>0)
389 /* we have all the words, they are in buf.. */
390 dom
= unix_domain_find(dname
);
394 len
= exp_rootfh(netns(file
), dom
, path
, &fh
, maxsize
);
395 auth_domain_put(dom
);
400 len
= SIMPLE_TRANSACTION_LIMIT
;
401 qword_addhex(&mesg
, &len
, (char*)&fh
.fh_base
, fh
.fh_size
);
407 * write_threads - Start NFSD, or report the current number of running threads
413 * On success: passed-in buffer filled with '\n'-terminated C
414 * string numeric value representing the number of
415 * running NFSD threads;
416 * return code is the size in bytes of the string
417 * On error: return code is zero
422 * buf: C string containing an unsigned
423 * integer value representing the
424 * number of NFSD threads to start
425 * size: non-zero length of C string in @buf
427 * On success: NFS service is started;
428 * passed-in buffer filled with '\n'-terminated C
429 * string numeric value representing the number of
430 * running NFSD threads;
431 * return code is the size in bytes of the string
432 * On error: return code is zero or a negative errno value
434 static ssize_t
write_threads(struct file
*file
, char *buf
, size_t size
)
438 struct net
*net
= netns(file
);
442 rv
= get_int(&mesg
, &newthreads
);
447 rv
= nfsd_svc(newthreads
, net
, file
->f_cred
);
451 rv
= nfsd_nrthreads(net
);
453 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%d\n", rv
);
457 * write_pool_threads - Set or report the current number of threads per pool
466 * buf: C string containing whitespace-
467 * separated unsigned integer values
468 * representing the number of NFSD
469 * threads to start in each pool
470 * size: non-zero length of C string in @buf
472 * On success: passed-in buffer filled with '\n'-terminated C
473 * string containing integer values representing the
474 * number of NFSD threads in each pool;
475 * return code is the size in bytes of the string
476 * On error: return code is zero or a negative errno value
478 static ssize_t
write_pool_threads(struct file
*file
, char *buf
, size_t size
)
480 /* if size > 0, look for an array of number of threads per node
481 * and apply them then write out number of threads per node as reply
489 struct net
*net
= netns(file
);
491 mutex_lock(&nfsd_mutex
);
492 npools
= nfsd_nrpools(net
);
495 * NFS is shut down. The admin can start it by
496 * writing to the threads file but NOT the pool_threads
497 * file, sorry. Report zero threads.
499 mutex_unlock(&nfsd_mutex
);
504 nthreads
= kcalloc(npools
, sizeof(int), GFP_KERNEL
);
506 if (nthreads
== NULL
)
510 for (i
= 0; i
< npools
; i
++) {
511 rv
= get_int(&mesg
, &nthreads
[i
]);
513 break; /* fewer numbers than pools */
515 goto out_free
; /* syntax error */
520 rv
= nfsd_set_nrthreads(i
, nthreads
, net
);
525 rv
= nfsd_get_nrthreads(npools
, nthreads
, net
);
530 size
= SIMPLE_TRANSACTION_LIMIT
;
531 for (i
= 0; i
< npools
&& size
> 0; i
++) {
532 snprintf(mesg
, size
, "%d%c", nthreads
[i
], (i
== npools
-1 ? '\n' : ' '));
540 mutex_unlock(&nfsd_mutex
);
545 nfsd_print_version_support(struct nfsd_net
*nn
, char *buf
, int remaining
,
546 const char *sep
, unsigned vers
, int minor
)
548 const char *format
= minor
< 0 ? "%s%c%u" : "%s%c%u.%u";
549 bool supported
= !!nfsd_vers(nn
, vers
, NFSD_TEST
);
551 if (vers
== 4 && minor
>= 0 &&
552 !nfsd_minorversion(nn
, minor
, NFSD_TEST
))
554 if (minor
== 0 && supported
)
556 * special case for backward compatability.
557 * +4.0 is never reported, it is implied by
558 * +4, unless -4.0 is present.
561 return snprintf(buf
, remaining
, format
, sep
,
562 supported
? '+' : '-', vers
, minor
);
565 static ssize_t
__write_versions(struct file
*file
, char *buf
, size_t size
)
568 char *vers
, *minorp
, sign
;
569 int len
, num
, remaining
;
572 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
576 /* Cannot change versions without updating
577 * nn->nfsd_serv->sv_xdrsize, and reallocing
578 * rq_argp and rq_resp
581 if (buf
[size
-1] != '\n')
586 len
= qword_get(&mesg
, vers
, size
);
587 if (len
<= 0) return -EINVAL
;
592 if (sign
== '+' || sign
== '-')
593 num
= simple_strtol((vers
+1), &minorp
, 0);
595 num
= simple_strtol(vers
, &minorp
, 0);
596 if (*minorp
== '.') {
599 if (kstrtouint(minorp
+1, 0, &minor
) < 0)
603 cmd
= sign
== '-' ? NFSD_CLEAR
: NFSD_SET
;
607 nfsd_vers(nn
, num
, cmd
);
610 if (*minorp
== '.') {
611 if (nfsd_minorversion(nn
, minor
, cmd
) < 0)
613 } else if ((cmd
== NFSD_SET
) != nfsd_vers(nn
, num
, NFSD_TEST
)) {
615 * Either we have +4 and no minors are enabled,
616 * or we have -4 and at least one minor is enabled.
617 * In either case, propagate 'cmd' to all minors.
620 while (nfsd_minorversion(nn
, minor
, cmd
) >= 0)
628 } while ((len
= qword_get(&mesg
, vers
, size
)) > 0);
629 /* If all get turned off, turn them back on, as
630 * having no versions is BAD
632 nfsd_reset_versions(nn
);
635 /* Now write current state into reply buffer */
638 remaining
= SIMPLE_TRANSACTION_LIMIT
;
639 for (num
=2 ; num
<= 4 ; num
++) {
641 if (!nfsd_vers(nn
, num
, NFSD_AVAIL
))
646 len
= nfsd_print_version_support(nn
, buf
, remaining
,
648 if (len
>= remaining
)
656 } while (num
== 4 && minor
<= NFSD_SUPPORTED_MINOR_VERSION
);
659 len
= snprintf(buf
, remaining
, "\n");
660 if (len
>= remaining
)
666 * write_versions - Set or report the available NFS protocol versions
672 * On success: passed-in buffer filled with '\n'-terminated C
673 * string containing positive or negative integer
674 * values representing the current status of each
676 * return code is the size in bytes of the string
677 * On error: return code is zero or a negative errno value
682 * buf: C string containing whitespace-
683 * separated positive or negative
684 * integer values representing NFS
685 * protocol versions to enable ("+n")
687 * size: non-zero length of C string in @buf
689 * On success: status of zero or more protocol versions has
690 * been updated; passed-in buffer filled with
691 * '\n'-terminated C string containing positive
692 * or negative integer values representing the
693 * current status of each protocol version;
694 * return code is the size in bytes of the string
695 * On error: return code is zero or a negative errno value
697 static ssize_t
write_versions(struct file
*file
, char *buf
, size_t size
)
701 mutex_lock(&nfsd_mutex
);
702 rv
= __write_versions(file
, buf
, size
);
703 mutex_unlock(&nfsd_mutex
);
708 * Zero-length write. Return a list of NFSD's current listener
711 static ssize_t
__write_ports_names(char *buf
, struct net
*net
)
713 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
715 if (nn
->nfsd_serv
== NULL
)
717 return svc_xprt_names(nn
->nfsd_serv
, buf
, SIMPLE_TRANSACTION_LIMIT
);
721 * A single 'fd' number was written, in which case it must be for
722 * a socket of a supported family/protocol, and we use it as an
725 static ssize_t
__write_ports_addfd(char *buf
, struct net
*net
, const struct cred
*cred
)
729 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
731 err
= get_int(&mesg
, &fd
);
732 if (err
!= 0 || fd
< 0)
735 if (svc_alien_sock(net
, fd
)) {
736 printk(KERN_ERR
"%s: socket net is different to NFSd's one\n", __func__
);
740 err
= nfsd_create_serv(net
);
744 err
= svc_addsock(nn
->nfsd_serv
, fd
, buf
, SIMPLE_TRANSACTION_LIMIT
, cred
);
750 /* Decrease the count, but don't shut down the service */
751 nn
->nfsd_serv
->sv_nrthreads
--;
756 * A transport listener is added by writing it's transport name and
759 static ssize_t
__write_ports_addxprt(char *buf
, struct net
*net
, const struct cred
*cred
)
762 struct svc_xprt
*xprt
;
764 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
766 if (sscanf(buf
, "%15s %5u", transport
, &port
) != 2)
769 if (port
< 1 || port
> USHRT_MAX
)
772 err
= nfsd_create_serv(net
);
776 err
= svc_create_xprt(nn
->nfsd_serv
, transport
, net
,
777 PF_INET
, port
, SVC_SOCK_ANONYMOUS
, cred
);
781 err
= svc_create_xprt(nn
->nfsd_serv
, transport
, net
,
782 PF_INET6
, port
, SVC_SOCK_ANONYMOUS
, cred
);
783 if (err
< 0 && err
!= -EAFNOSUPPORT
)
786 /* Decrease the count, but don't shut down the service */
787 nn
->nfsd_serv
->sv_nrthreads
--;
790 xprt
= svc_find_xprt(nn
->nfsd_serv
, transport
, net
, PF_INET
, port
);
792 svc_close_xprt(xprt
);
796 if (!list_empty(&nn
->nfsd_serv
->sv_permsocks
))
797 nn
->nfsd_serv
->sv_nrthreads
--;
803 static ssize_t
__write_ports(struct file
*file
, char *buf
, size_t size
,
807 return __write_ports_names(buf
, net
);
810 return __write_ports_addfd(buf
, net
, file
->f_cred
);
813 return __write_ports_addxprt(buf
, net
, file
->f_cred
);
819 * write_ports - Pass a socket file descriptor or transport name to listen on
825 * On success: passed-in buffer filled with a '\n'-terminated C
826 * string containing a whitespace-separated list of
827 * named NFSD listeners;
828 * return code is the size in bytes of the string
829 * On error: return code is zero or a negative errno value
834 * buf: C string containing an unsigned
835 * integer value representing a bound
836 * but unconnected socket that is to be
837 * used as an NFSD listener; listen(3)
838 * must be called for a SOCK_STREAM
839 * socket, otherwise it is ignored
840 * size: non-zero length of C string in @buf
842 * On success: NFS service is started;
843 * passed-in buffer filled with a '\n'-terminated C
844 * string containing a unique alphanumeric name of
846 * return code is the size in bytes of the string
847 * On error: return code is a negative errno value
852 * buf: C string containing a transport
853 * name and an unsigned integer value
854 * representing the port to listen on,
855 * separated by whitespace
856 * size: non-zero length of C string in @buf
858 * On success: returns zero; NFS service is started
859 * On error: return code is a negative errno value
861 static ssize_t
write_ports(struct file
*file
, char *buf
, size_t size
)
865 mutex_lock(&nfsd_mutex
);
866 rv
= __write_ports(file
, buf
, size
, netns(file
));
867 mutex_unlock(&nfsd_mutex
);
872 int nfsd_max_blksize
;
875 * write_maxblksize - Set or report the current NFS blksize
884 * buf: C string containing an unsigned
885 * integer value representing the new
887 * size: non-zero length of C string in @buf
889 * On success: passed-in buffer filled with '\n'-terminated C string
890 * containing numeric value of the current NFS blksize
892 * return code is the size in bytes of the string
893 * On error: return code is zero or a negative errno value
895 static ssize_t
write_maxblksize(struct file
*file
, char *buf
, size_t size
)
898 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
902 int rv
= get_int(&mesg
, &bsize
);
905 /* force bsize into allowed range and
906 * required alignment.
908 bsize
= max_t(int, bsize
, 1024);
909 bsize
= min_t(int, bsize
, NFSSVC_MAXBLKSIZE
);
911 mutex_lock(&nfsd_mutex
);
913 mutex_unlock(&nfsd_mutex
);
916 nfsd_max_blksize
= bsize
;
917 mutex_unlock(&nfsd_mutex
);
920 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%d\n",
925 * write_maxconn - Set or report the current max number of connections
933 * buf: C string containing an unsigned
934 * integer value representing the new
935 * number of max connections
936 * size: non-zero length of C string in @buf
938 * On success: passed-in buffer filled with '\n'-terminated C string
939 * containing numeric value of max_connections setting
940 * for this net namespace;
941 * return code is the size in bytes of the string
942 * On error: return code is zero or a negative errno value
944 static ssize_t
write_maxconn(struct file
*file
, char *buf
, size_t size
)
947 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
948 unsigned int maxconn
= nn
->max_connections
;
951 int rv
= get_uint(&mesg
, &maxconn
);
955 nn
->max_connections
= maxconn
;
958 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%u\n", maxconn
);
961 #ifdef CONFIG_NFSD_V4
962 static ssize_t
__nfsd4_write_time(struct file
*file
, char *buf
, size_t size
,
963 time64_t
*time
, struct nfsd_net
*nn
)
971 rv
= get_int(&mesg
, &i
);
975 * Some sanity checking. We don't have a reason for
976 * these particular numbers, but problems with the
978 * - Too short: the briefest network outage may
979 * cause clients to lose all their locks. Also,
980 * the frequent polling may be wasteful.
981 * - Too long: do you really want reboot recovery
982 * to take more than an hour? Or to make other
983 * clients wait an hour before being able to
984 * revoke a dead client's locks?
986 if (i
< 10 || i
> 3600)
991 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%lld\n", *time
);
994 static ssize_t
nfsd4_write_time(struct file
*file
, char *buf
, size_t size
,
995 time64_t
*time
, struct nfsd_net
*nn
)
999 mutex_lock(&nfsd_mutex
);
1000 rv
= __nfsd4_write_time(file
, buf
, size
, time
, nn
);
1001 mutex_unlock(&nfsd_mutex
);
1006 * write_leasetime - Set or report the current NFSv4 lease time
1015 * buf: C string containing an unsigned
1016 * integer value representing the new
1017 * NFSv4 lease expiry time
1018 * size: non-zero length of C string in @buf
1020 * On success: passed-in buffer filled with '\n'-terminated C
1021 * string containing unsigned integer value of the
1022 * current lease expiry time;
1023 * return code is the size in bytes of the string
1024 * On error: return code is zero or a negative errno value
1026 static ssize_t
write_leasetime(struct file
*file
, char *buf
, size_t size
)
1028 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
1029 return nfsd4_write_time(file
, buf
, size
, &nn
->nfsd4_lease
, nn
);
1033 * write_gracetime - Set or report current NFSv4 grace period time
1035 * As above, but sets the time of the NFSv4 grace period.
1037 * Note this should never be set to less than the *previous*
1038 * lease-period time, but we don't try to enforce this. (In the common
1039 * case (a new boot), we don't know what the previous lease time was
1042 static ssize_t
write_gracetime(struct file
*file
, char *buf
, size_t size
)
1044 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
1045 return nfsd4_write_time(file
, buf
, size
, &nn
->nfsd4_grace
, nn
);
1048 static ssize_t
__write_recoverydir(struct file
*file
, char *buf
, size_t size
,
1049 struct nfsd_net
*nn
)
1058 if (size
> PATH_MAX
|| buf
[size
-1] != '\n')
1063 len
= qword_get(&mesg
, recdir
, size
);
1067 status
= nfs4_reset_recoverydir(recdir
);
1072 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%s\n",
1073 nfs4_recoverydir());
1077 * write_recoverydir - Set or report the pathname of the recovery directory
1086 * buf: C string containing the pathname
1087 * of the directory on a local file
1088 * system containing permanent NFSv4
1090 * size: non-zero length of C string in @buf
1092 * On success: passed-in buffer filled with '\n'-terminated C string
1093 * containing the current recovery pathname setting;
1094 * return code is the size in bytes of the string
1095 * On error: return code is zero or a negative errno value
1097 static ssize_t
write_recoverydir(struct file
*file
, char *buf
, size_t size
)
1100 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
1102 mutex_lock(&nfsd_mutex
);
1103 rv
= __write_recoverydir(file
, buf
, size
, nn
);
1104 mutex_unlock(&nfsd_mutex
);
1109 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1118 * size: non-zero length of C string in @buf
1120 * passed-in buffer filled with "Y" or "N" with a newline
1121 * and NULL-terminated C string. This indicates whether
1122 * the grace period has ended in the current net
1123 * namespace. Return code is the size in bytes of the
1124 * string. Writing a string that starts with 'Y', 'y', or
1125 * '1' to the file will end the grace period for nfsd's v4
1128 static ssize_t
write_v4_end_grace(struct file
*file
, char *buf
, size_t size
)
1130 struct nfsd_net
*nn
= net_generic(netns(file
), nfsd_net_id
);
1139 nfsd4_end_grace(nn
);
1146 return scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
, "%c\n",
1147 nn
->grace_ended
? 'Y' : 'N');
1152 /*----------------------------------------------------------------------------*/
1154 * populating the filesystem.
1157 /* Basically copying rpc_get_inode. */
1158 static struct inode
*nfsd_get_inode(struct super_block
*sb
, umode_t mode
)
1160 struct inode
*inode
= new_inode(sb
);
1163 /* Following advice from simple_fill_super documentation: */
1164 inode
->i_ino
= iunique(sb
, NFSD_MaxReserved
);
1165 inode
->i_mode
= mode
;
1166 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
1167 switch (mode
& S_IFMT
) {
1169 inode
->i_fop
= &simple_dir_operations
;
1170 inode
->i_op
= &simple_dir_inode_operations
;
1179 static int __nfsd_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, struct nfsdfs_client
*ncl
)
1181 struct inode
*inode
;
1183 inode
= nfsd_get_inode(dir
->i_sb
, mode
);
1187 inode
->i_private
= ncl
;
1188 kref_get(&ncl
->cl_ref
);
1190 d_add(dentry
, inode
);
1192 fsnotify_mkdir(dir
, dentry
);
1196 static struct dentry
*nfsd_mkdir(struct dentry
*parent
, struct nfsdfs_client
*ncl
, char *name
)
1198 struct inode
*dir
= parent
->d_inode
;
1199 struct dentry
*dentry
;
1203 dentry
= d_alloc_name(parent
, name
);
1206 ret
= __nfsd_mkdir(d_inode(parent
), dentry
, S_IFDIR
| 0600, ncl
);
1214 dentry
= ERR_PTR(ret
);
1218 static void clear_ncl(struct inode
*inode
)
1220 struct nfsdfs_client
*ncl
= inode
->i_private
;
1222 inode
->i_private
= NULL
;
1223 kref_put(&ncl
->cl_ref
, ncl
->cl_release
);
1226 static struct nfsdfs_client
*__get_nfsdfs_client(struct inode
*inode
)
1228 struct nfsdfs_client
*nc
= inode
->i_private
;
1231 kref_get(&nc
->cl_ref
);
1235 struct nfsdfs_client
*get_nfsdfs_client(struct inode
*inode
)
1237 struct nfsdfs_client
*nc
;
1239 inode_lock_shared(inode
);
1240 nc
= __get_nfsdfs_client(inode
);
1241 inode_unlock_shared(inode
);
1244 /* from __rpc_unlink */
1245 static void nfsdfs_remove_file(struct inode
*dir
, struct dentry
*dentry
)
1249 clear_ncl(d_inode(dentry
));
1251 ret
= simple_unlink(dir
, dentry
);
1257 static void nfsdfs_remove_files(struct dentry
*root
)
1259 struct dentry
*dentry
, *tmp
;
1261 list_for_each_entry_safe(dentry
, tmp
, &root
->d_subdirs
, d_child
) {
1262 if (!simple_positive(dentry
)) {
1263 WARN_ON_ONCE(1); /* I think this can't happen? */
1266 nfsdfs_remove_file(d_inode(root
), dentry
);
1270 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1272 static int nfsdfs_create_files(struct dentry
*root
,
1273 const struct tree_descr
*files
,
1274 struct dentry
**fdentries
)
1276 struct inode
*dir
= d_inode(root
);
1277 struct inode
*inode
;
1278 struct dentry
*dentry
;
1282 for (i
= 0; files
->name
&& files
->name
[0]; i
++, files
++) {
1283 dentry
= d_alloc_name(root
, files
->name
);
1286 inode
= nfsd_get_inode(d_inode(root
)->i_sb
,
1287 S_IFREG
| files
->mode
);
1292 inode
->i_fop
= files
->ops
;
1293 inode
->i_private
= __get_nfsdfs_client(dir
);
1294 d_add(dentry
, inode
);
1295 fsnotify_create(dir
, dentry
);
1297 fdentries
[i
] = dentry
;
1302 nfsdfs_remove_files(root
);
1307 /* on success, returns positive number unique to that client. */
1308 struct dentry
*nfsd_client_mkdir(struct nfsd_net
*nn
,
1309 struct nfsdfs_client
*ncl
, u32 id
,
1310 const struct tree_descr
*files
,
1311 struct dentry
**fdentries
)
1313 struct dentry
*dentry
;
1317 sprintf(name
, "%u", id
);
1319 dentry
= nfsd_mkdir(nn
->nfsd_client_dir
, ncl
, name
);
1320 if (IS_ERR(dentry
)) /* XXX: tossing errors? */
1322 ret
= nfsdfs_create_files(dentry
, files
, fdentries
);
1324 nfsd_client_rmdir(dentry
);
1330 /* Taken from __rpc_rmdir: */
1331 void nfsd_client_rmdir(struct dentry
*dentry
)
1333 struct inode
*dir
= d_inode(dentry
->d_parent
);
1334 struct inode
*inode
= d_inode(dentry
);
1338 nfsdfs_remove_files(dentry
);
1341 ret
= simple_rmdir(dir
, dentry
);
1343 fsnotify_rmdir(dir
, dentry
);
1349 static int nfsd_fill_super(struct super_block
*sb
, struct fs_context
*fc
)
1351 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
1353 struct dentry
*dentry
;
1356 static const struct tree_descr nfsd_files
[] = {
1357 [NFSD_List
] = {"exports", &exports_nfsd_operations
, S_IRUGO
},
1358 /* Per-export io stats use same ops as exports file */
1359 [NFSD_Export_Stats
] = {"export_stats", &exports_nfsd_operations
, S_IRUGO
},
1360 [NFSD_Export_features
] = {"export_features",
1361 &export_features_operations
, S_IRUGO
},
1362 [NFSD_FO_UnlockIP
] = {"unlock_ip",
1363 &transaction_ops
, S_IWUSR
|S_IRUSR
},
1364 [NFSD_FO_UnlockFS
] = {"unlock_filesystem",
1365 &transaction_ops
, S_IWUSR
|S_IRUSR
},
1366 [NFSD_Fh
] = {"filehandle", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1367 [NFSD_Threads
] = {"threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1368 [NFSD_Pool_Threads
] = {"pool_threads", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1369 [NFSD_Pool_Stats
] = {"pool_stats", &pool_stats_operations
, S_IRUGO
},
1370 [NFSD_Reply_Cache_Stats
] = {"reply_cache_stats", &reply_cache_stats_operations
, S_IRUGO
},
1371 [NFSD_Versions
] = {"versions", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1372 [NFSD_Ports
] = {"portlist", &transaction_ops
, S_IWUSR
|S_IRUGO
},
1373 [NFSD_MaxBlkSize
] = {"max_block_size", &transaction_ops
, S_IWUSR
|S_IRUGO
},
1374 [NFSD_MaxConnections
] = {"max_connections", &transaction_ops
, S_IWUSR
|S_IRUGO
},
1375 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1376 [NFSD_SupportedEnctypes
] = {"supported_krb5_enctypes", &supported_enctypes_ops
, S_IRUGO
},
1377 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1378 #ifdef CONFIG_NFSD_V4
1379 [NFSD_Leasetime
] = {"nfsv4leasetime", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1380 [NFSD_Gracetime
] = {"nfsv4gracetime", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1381 [NFSD_RecoveryDir
] = {"nfsv4recoverydir", &transaction_ops
, S_IWUSR
|S_IRUSR
},
1382 [NFSD_V4EndGrace
] = {"v4_end_grace", &transaction_ops
, S_IWUSR
|S_IRUGO
},
1387 ret
= simple_fill_super(sb
, 0x6e667364, nfsd_files
);
1390 dentry
= nfsd_mkdir(sb
->s_root
, NULL
, "clients");
1392 return PTR_ERR(dentry
);
1393 nn
->nfsd_client_dir
= dentry
;
1397 static int nfsd_fs_get_tree(struct fs_context
*fc
)
1399 return get_tree_keyed(fc
, nfsd_fill_super
, get_net(fc
->net_ns
));
1402 static void nfsd_fs_free_fc(struct fs_context
*fc
)
1405 put_net(fc
->s_fs_info
);
1408 static const struct fs_context_operations nfsd_fs_context_ops
= {
1409 .free
= nfsd_fs_free_fc
,
1410 .get_tree
= nfsd_fs_get_tree
,
1413 static int nfsd_init_fs_context(struct fs_context
*fc
)
1415 put_user_ns(fc
->user_ns
);
1416 fc
->user_ns
= get_user_ns(fc
->net_ns
->user_ns
);
1417 fc
->ops
= &nfsd_fs_context_ops
;
1421 static void nfsd_umount(struct super_block
*sb
)
1423 struct net
*net
= sb
->s_fs_info
;
1425 nfsd_shutdown_threads(net
);
1427 kill_litter_super(sb
);
1431 static struct file_system_type nfsd_fs_type
= {
1432 .owner
= THIS_MODULE
,
1434 .init_fs_context
= nfsd_init_fs_context
,
1435 .kill_sb
= nfsd_umount
,
1437 MODULE_ALIAS_FS("nfsd");
1439 #ifdef CONFIG_PROC_FS
1440 static int create_proc_exports_entry(void)
1442 struct proc_dir_entry
*entry
;
1444 entry
= proc_mkdir("fs/nfs", NULL
);
1447 entry
= proc_create("exports", 0, entry
, &exports_proc_ops
);
1449 remove_proc_entry("fs/nfs", NULL
);
1454 #else /* CONFIG_PROC_FS */
1455 static int create_proc_exports_entry(void)
1461 unsigned int nfsd_net_id
;
1463 static __net_init
int nfsd_init_net(struct net
*net
)
1466 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1468 retval
= nfsd_export_init(net
);
1470 goto out_export_error
;
1471 retval
= nfsd_idmap_init(net
);
1473 goto out_idmap_error
;
1474 nn
->nfsd_versions
= NULL
;
1475 nn
->nfsd4_minorversions
= NULL
;
1476 retval
= nfsd_reply_cache_init(nn
);
1479 nn
->nfsd4_lease
= 90; /* default lease time */
1480 nn
->nfsd4_grace
= 90;
1481 nn
->somebody_reclaimed
= false;
1482 nn
->track_reclaim_completes
= false;
1483 nn
->clverifier_counter
= prandom_u32();
1484 nn
->clientid_base
= prandom_u32();
1485 nn
->clientid_counter
= nn
->clientid_base
+ 1;
1486 nn
->s2s_cp_cl_id
= nn
->clientid_counter
++;
1488 atomic_set(&nn
->ntf_refcnt
, 0);
1489 init_waitqueue_head(&nn
->ntf_wq
);
1490 seqlock_init(&nn
->boot_lock
);
1495 nfsd_idmap_shutdown(net
);
1497 nfsd_export_shutdown(net
);
1502 static __net_exit
void nfsd_exit_net(struct net
*net
)
1504 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1506 nfsd_reply_cache_shutdown(nn
);
1507 nfsd_idmap_shutdown(net
);
1508 nfsd_export_shutdown(net
);
1509 nfsd_netns_free_versions(net_generic(net
, nfsd_net_id
));
1512 static struct pernet_operations nfsd_net_ops
= {
1513 .init
= nfsd_init_net
,
1514 .exit
= nfsd_exit_net
,
1516 .size
= sizeof(struct nfsd_net
),
1519 static int __init
init_nfsd(void)
1522 printk(KERN_INFO
"Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1524 retval
= register_cld_notifier();
1527 retval
= nfsd4_init_slabs();
1529 goto out_unregister_notifier
;
1530 retval
= nfsd4_init_pnfs();
1532 goto out_free_slabs
;
1533 retval
= nfsd_stat_init(); /* Statistics */
1536 retval
= nfsd_drc_slab_create();
1539 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1540 retval
= create_proc_exports_entry();
1542 goto out_free_lockd
;
1543 retval
= register_filesystem(&nfsd_fs_type
);
1545 goto out_free_exports
;
1546 retval
= register_pernet_subsys(&nfsd_net_ops
);
1551 unregister_filesystem(&nfsd_fs_type
);
1553 remove_proc_entry("fs/nfs/exports", NULL
);
1554 remove_proc_entry("fs/nfs", NULL
);
1556 nfsd_lockd_shutdown();
1557 nfsd_drc_slab_free();
1559 nfsd_stat_shutdown();
1564 out_unregister_notifier
:
1565 unregister_cld_notifier();
1569 static void __exit
exit_nfsd(void)
1571 unregister_pernet_subsys(&nfsd_net_ops
);
1572 nfsd_drc_slab_free();
1573 remove_proc_entry("fs/nfs/exports", NULL
);
1574 remove_proc_entry("fs/nfs", NULL
);
1575 nfsd_stat_shutdown();
1576 nfsd_lockd_shutdown();
1579 unregister_filesystem(&nfsd_fs_type
);
1580 unregister_cld_notifier();
1583 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1584 MODULE_LICENSE("GPL");
1585 module_init(init_nfsd
)
1586 module_exit(exit_nfsd
)