blob: 4ec3d6e03e76dc0909c25fd90b4c9e2ee0dd33a8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/lockd/svcsubs.c
3 *
4 * Various support routines for the NLM server.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/time.h>
12#include <linux/in.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080014#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/svc.h>
Jeff Layton59766872013-02-04 12:50:00 -050016#include <linux/sunrpc/addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/lockd/lockd.h>
18#include <linux/lockd/share.h>
Wendy Cheng4373ea82008-01-17 11:10:12 -050019#include <linux/module.h>
20#include <linux/mount.h>
Christoph Hellwig9c69de42014-05-06 19:37:13 +020021#include <uapi/linux/nfs2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#define NLMDBG_FACILITY NLMDBG_SVCSUBS
24
25
26/*
27 * Global file hash table
28 */
Olaf Kirch07ba8062006-10-04 02:15:58 -070029#define FILE_HASH_BITS 7
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#define FILE_NRHASH (1<<FILE_HASH_BITS)
Olaf Kirch07ba8062006-10-04 02:15:58 -070031static struct hlist_head nlm_files[FILE_NRHASH];
Ingo Molnar353ab6e2006-03-26 01:37:12 -080032static DEFINE_MUTEX(nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Mark Salter135dd002015-04-06 09:46:00 -040034#ifdef CONFIG_SUNRPC_DEBUG
Chuck Lever0bbacc42005-11-01 16:53:32 -050035static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
36{
37 u32 *fhp = (u32*)f->data;
38
39 /* print the first 32 bytes of the fh */
40 dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
41 msg, fhp[0], fhp[1], fhp[2], fhp[3],
42 fhp[4], fhp[5], fhp[6], fhp[7]);
43}
44
45static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
46{
Al Viro496ad9a2013-01-23 17:07:38 -050047 struct inode *inode = file_inode(file->f_file);
Chuck Lever0bbacc42005-11-01 16:53:32 -050048
49 dprintk("lockd: %s %s/%ld\n",
50 msg, inode->i_sb->s_id, inode->i_ino);
51}
52#else
53static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
54{
55 return;
56}
57
58static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
59{
60 return;
61}
62#endif
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static inline unsigned int file_hash(struct nfs_fh *f)
65{
66 unsigned int tmp=0;
67 int i;
68 for (i=0; i<NFS2_FHSIZE;i++)
69 tmp += f->data[i];
70 return tmp & (FILE_NRHASH - 1);
71}
72
73/*
74 * Lookup file info. If it doesn't exist, create a file info struct
75 * and open a (VFS) file for the given inode.
76 *
77 * FIXME:
78 * Note that we open the file O_RDONLY even when creating write locks.
79 * This is not quite right, but for now, we assume the client performs
80 * the proper R/W checking.
81 */
Al Viro52921e02006-10-19 23:28:46 -070082__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070083nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
84 struct nfs_fh *f)
85{
86 struct nlm_file *file;
87 unsigned int hash;
Al Viro52921e02006-10-19 23:28:46 -070088 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
J. Bruce Fields50431d92007-08-31 17:09:33 -040090 nlm_debug_print_fh("nlm_lookup_file", f);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 hash = file_hash(f);
93
94 /* Lock file table */
Ingo Molnar353ab6e2006-03-26 01:37:12 -080095 mutex_lock(&nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Sasha Levinb67bfe02013-02-27 17:06:00 -080097 hlist_for_each_entry(file, &nlm_files[hash], f_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 if (!nfs_compare_fh(&file->f_handle, f))
99 goto found;
100
Chuck Lever0bbacc42005-11-01 16:53:32 -0500101 nlm_debug_print_fh("creating file for", f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 nfserr = nlm_lck_denied_nolocks;
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700104 file = kzalloc(sizeof(*file), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (!file)
106 goto out_unlock;
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
Neil Brown89e63ef2006-10-04 02:16:06 -0700109 mutex_init(&file->f_mutex);
Olaf Kirch07ba8062006-10-04 02:15:58 -0700110 INIT_HLIST_NODE(&file->f_list);
Olaf Kirch68a2d762006-10-04 02:15:57 -0700111 INIT_LIST_HEAD(&file->f_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 /* Open the file. Note that this must not sleep for too long, else
114 * we would lock up lockd:-) So no NFS re-exports, folks.
115 *
116 * We have to make sure we have the right credential to open
117 * the file.
118 */
119 if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
Olaf Kirchf0737a32006-10-04 02:15:54 -0700120 dprintk("lockd: open failed (error %d)\n", nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 goto out_free;
122 }
123
Olaf Kirch07ba8062006-10-04 02:15:58 -0700124 hlist_add_head(&file->f_list, &nlm_files[hash]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126found:
127 dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
128 *result = file;
129 file->f_count++;
130 nfserr = 0;
131
132out_unlock:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800133 mutex_unlock(&nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return nfserr;
135
136out_free:
137 kfree(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 goto out_unlock;
139}
140
141/*
142 * Delete a file after having released all locks, blocks and shares
143 */
144static inline void
145nlm_delete_file(struct nlm_file *file)
146{
Chuck Lever0bbacc42005-11-01 16:53:32 -0500147 nlm_debug_print_file("closing file", file);
Olaf Kirch07ba8062006-10-04 02:15:58 -0700148 if (!hlist_unhashed(&file->f_list)) {
149 hlist_del(&file->f_list);
150 nlmsvc_ops->fclose(file->f_file);
151 kfree(file);
152 } else {
153 printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157/*
158 * Loop over all locks on the given file and perform the specified
159 * action.
160 */
161static int
Olaf Kirchf2af7932006-10-04 02:15:59 -0700162nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
163 nlm_host_match_fn_t match)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 struct inode *inode = nlmsvc_file_inode(file);
166 struct file_lock *fl;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500167 struct file_lock_context *flctx = inode->i_flctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 struct nlm_host *lockhost;
169
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500170 if (!flctx || list_empty_careful(&flctx->flc_posix))
171 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172again:
173 file->f_locks = 0;
Jeff Layton6109c852015-01-16 15:05:57 -0500174 spin_lock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500175 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
J. Bruce Fields7117bf32006-03-20 13:44:26 -0500176 if (fl->fl_lmops != &nlmsvc_lock_operations)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 continue;
178
179 /* update current lock count */
180 file->f_locks++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Olaf Kirchf2af7932006-10-04 02:15:59 -0700182 lockhost = (struct nlm_host *) fl->fl_owner;
183 if (match(lockhost, host)) {
184 struct file_lock lock = *fl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Jeff Layton6109c852015-01-16 15:05:57 -0500186 spin_unlock(&flctx->flc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 lock.fl_type = F_UNLCK;
188 lock.fl_start = 0;
189 lock.fl_end = OFFSET_MAX;
Marc Eshel1a8322b2006-11-28 16:27:06 -0500190 if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 printk("lockd: unlock failure in %s:%d\n",
192 __FILE__, __LINE__);
193 return 1;
194 }
195 goto again;
196 }
197 }
Jeff Layton6109c852015-01-16 15:05:57 -0500198 spin_unlock(&flctx->flc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 return 0;
201}
202
Wendy Cheng17efa372008-01-17 11:10:12 -0500203static int
204nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
205{
206 return 1;
207}
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209/*
Olaf Kirchf2af7932006-10-04 02:15:59 -0700210 * Inspect a single file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 */
212static inline int
Olaf Kirchf2af7932006-10-04 02:15:59 -0700213nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
Olaf Kirchf2af7932006-10-04 02:15:59 -0700215 nlmsvc_traverse_blocks(host, file, match);
216 nlmsvc_traverse_shares(host, file, match);
217 return nlm_traverse_locks(host, file, match);
218}
219
220/*
221 * Quick check whether there are still any locks, blocks or
222 * shares on a given file.
223 */
224static inline int
225nlm_file_inuse(struct nlm_file *file)
226{
227 struct inode *inode = nlmsvc_file_inode(file);
228 struct file_lock *fl;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500229 struct file_lock_context *flctx = inode->i_flctx;
Olaf Kirchf2af7932006-10-04 02:15:59 -0700230
231 if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
232 return 1;
233
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500234 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
Jeff Layton6109c852015-01-16 15:05:57 -0500235 spin_lock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500236 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
237 if (fl->fl_lmops == &nlmsvc_lock_operations) {
Jeff Layton6109c852015-01-16 15:05:57 -0500238 spin_unlock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500239 return 1;
240 }
Arnd Bergmann763641d2010-10-26 22:55:40 +0200241 }
Jeff Layton6109c852015-01-16 15:05:57 -0500242 spin_unlock(&flctx->flc_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
Olaf Kirchf2af7932006-10-04 02:15:59 -0700244 file->f_locks = 0;
245 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
248/*
249 * Loop over all files in the file table.
250 */
251static int
Wendy Cheng17efa372008-01-17 11:10:12 -0500252nlm_traverse_files(void *data, nlm_host_match_fn_t match,
253 int (*is_failover_file)(void *data, struct nlm_file *file))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Sasha Levinb67bfe02013-02-27 17:06:00 -0800255 struct hlist_node *next;
Olaf Kirch07ba8062006-10-04 02:15:58 -0700256 struct nlm_file *file;
Trond Myklebust01df9c52006-08-10 11:58:57 -0400257 int i, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800259 mutex_lock(&nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 for (i = 0; i < FILE_NRHASH; i++) {
Sasha Levinb67bfe02013-02-27 17:06:00 -0800261 hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
Wendy Cheng17efa372008-01-17 11:10:12 -0500262 if (is_failover_file && !is_failover_file(data, file))
263 continue;
Trond Myklebust01df9c52006-08-10 11:58:57 -0400264 file->f_count++;
265 mutex_unlock(&nlm_file_mutex);
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 /* Traverse locks, blocks and shares of this file
268 * and update file->f_locks count */
Wendy Cheng4373ea82008-01-17 11:10:12 -0500269 if (nlm_inspect_file(data, file, match))
Trond Myklebust01df9c52006-08-10 11:58:57 -0400270 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Trond Myklebust01df9c52006-08-10 11:58:57 -0400272 mutex_lock(&nlm_file_mutex);
273 file->f_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 /* No more references to this file. Let go of it. */
Olaf Kirch68a2d762006-10-04 02:15:57 -0700275 if (list_empty(&file->f_blocks) && !file->f_locks
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 && !file->f_shares && !file->f_count) {
Olaf Kirch07ba8062006-10-04 02:15:58 -0700277 hlist_del(&file->f_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 nlmsvc_ops->fclose(file->f_file);
279 kfree(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 }
281 }
282 }
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800283 mutex_unlock(&nlm_file_mutex);
Trond Myklebust01df9c52006-08-10 11:58:57 -0400284 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
287/*
288 * Release file. If there are no more remote locks on this file,
289 * close it and free the handle.
290 *
291 * Note that we can't do proper reference counting without major
292 * contortions because the code in fs/locks.c creates, deletes and
293 * splits locks without notification. Our only way is to walk the
294 * entire lock list each time we remove a lock.
295 */
296void
297nlm_release_file(struct nlm_file *file)
298{
299 dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
300 file, file->f_count);
301
302 /* Lock file table */
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800303 mutex_lock(&nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 /* If there are no more locks etc, delete the file */
Olaf Kirchf2af7932006-10-04 02:15:59 -0700306 if (--file->f_count == 0 && !nlm_file_inuse(file))
307 nlm_delete_file(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800309 mutex_unlock(&nlm_file_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
312/*
Olaf Kirchf2af7932006-10-04 02:15:59 -0700313 * Helpers function for resource traversal
314 *
315 * nlmsvc_mark_host:
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400316 * used by the garbage collector; simply sets h_inuse only for those
317 * hosts, which passed network check.
Olaf Kirchf2af7932006-10-04 02:15:59 -0700318 * Always returns 0.
319 *
320 * nlmsvc_same_host:
321 * returns 1 iff the two hosts match. Used to release
322 * all resources bound to a specific host.
323 *
324 * nlmsvc_is_client:
325 * returns 1 iff the host is a client.
326 * Used by nlmsvc_invalidate_all
327 */
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400328
Olaf Kirchf2af7932006-10-04 02:15:59 -0700329static int
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400330nlmsvc_mark_host(void *data, struct nlm_host *hint)
Olaf Kirchf2af7932006-10-04 02:15:59 -0700331{
Wendy Cheng4373ea82008-01-17 11:10:12 -0500332 struct nlm_host *host = data;
333
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400334 if ((hint->net == NULL) ||
335 (host->net == hint->net))
336 host->h_inuse = 1;
Olaf Kirchf2af7932006-10-04 02:15:59 -0700337 return 0;
338}
339
340static int
Wendy Cheng4373ea82008-01-17 11:10:12 -0500341nlmsvc_same_host(void *data, struct nlm_host *other)
Olaf Kirchf2af7932006-10-04 02:15:59 -0700342{
Wendy Cheng4373ea82008-01-17 11:10:12 -0500343 struct nlm_host *host = data;
344
Olaf Kirchf2af7932006-10-04 02:15:59 -0700345 return host == other;
346}
347
348static int
Wendy Cheng4373ea82008-01-17 11:10:12 -0500349nlmsvc_is_client(void *data, struct nlm_host *dummy)
Olaf Kirchf2af7932006-10-04 02:15:59 -0700350{
Wendy Cheng4373ea82008-01-17 11:10:12 -0500351 struct nlm_host *host = data;
352
NeilBrown4481d102006-10-17 00:10:17 -0700353 if (host->h_server) {
354 /* we are destroying locks even though the client
355 * hasn't asked us too, so don't unmonitor the
356 * client
357 */
358 if (host->h_nsmhandle)
359 host->h_nsmhandle->sm_sticky = 1;
360 return 1;
361 } else
362 return 0;
Olaf Kirchf2af7932006-10-04 02:15:59 -0700363}
364
365/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 * Mark all hosts that still hold resources
367 */
368void
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400369nlmsvc_mark_resources(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370{
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400371 struct nlm_host hint;
372
Vasily Averine919b072017-11-08 08:55:55 +0300373 dprintk("lockd: %s for net %x\n", __func__, net ? net->ns.inum : 0);
Stanislav Kinsburskyb26411f2012-07-25 16:55:54 +0400374 hint.net = net;
375 nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378/*
379 * Release all resources held by the given client
380 */
381void
382nlmsvc_free_host_resources(struct nlm_host *host)
383{
384 dprintk("lockd: nlmsvc_free_host_resources\n");
385
Wendy Cheng17efa372008-01-17 11:10:12 -0500386 if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 printk(KERN_WARNING
Olaf Kirchf0737a32006-10-04 02:15:54 -0700388 "lockd: couldn't remove all locks held by %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 host->h_name);
Olaf Kirchf0737a32006-10-04 02:15:54 -0700390 BUG();
391 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
393
Chuck Lever367c8c72008-06-30 18:58:14 -0400394/**
395 * nlmsvc_invalidate_all - remove all locks held for clients
396 *
397 * Release all locks held by NFS clients.
398 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 */
400void
401nlmsvc_invalidate_all(void)
402{
Chuck Lever367c8c72008-06-30 18:58:14 -0400403 /*
Olaf Kirchf2af7932006-10-04 02:15:59 -0700404 * Previously, the code would call
405 * nlmsvc_free_host_resources for each client in
406 * turn, which is about as inefficient as it gets.
407 * Now we just do it once in nlm_traverse_files.
408 */
Wendy Cheng17efa372008-01-17 11:10:12 -0500409 nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
Wendy Cheng4373ea82008-01-17 11:10:12 -0500411
412static int
Wendy Cheng17efa372008-01-17 11:10:12 -0500413nlmsvc_match_sb(void *datap, struct nlm_file *file)
414{
415 struct super_block *sb = datap;
416
Al Viro30e46ab2014-10-31 00:43:30 -0400417 return sb == file_inode(file->f_file)->i_sb;
Wendy Cheng17efa372008-01-17 11:10:12 -0500418}
419
Chuck Lever367c8c72008-06-30 18:58:14 -0400420/**
421 * nlmsvc_unlock_all_by_sb - release locks held on this file system
422 * @sb: super block
423 *
424 * Release all locks held by clients accessing this file system.
425 */
Wendy Cheng17efa372008-01-17 11:10:12 -0500426int
427nlmsvc_unlock_all_by_sb(struct super_block *sb)
428{
429 int ret;
430
431 ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
432 return ret ? -EIO : 0;
433}
434EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
435
436static int
Wendy Cheng4373ea82008-01-17 11:10:12 -0500437nlmsvc_match_ip(void *datap, struct nlm_host *host)
438{
Jeff Layton4516fc02009-08-14 12:57:54 -0400439 return rpc_cmp_addr(nlm_srcaddr(host), datap);
Wendy Cheng4373ea82008-01-17 11:10:12 -0500440}
441
Chuck Lever367c8c72008-06-30 18:58:14 -0400442/**
443 * nlmsvc_unlock_all_by_ip - release local locks by IP address
444 * @server_addr: server's IP address as seen by clients
445 *
446 * Release all locks held by clients accessing this host
447 * via the passed in IP address.
448 */
Wendy Cheng4373ea82008-01-17 11:10:12 -0500449int
Chuck Lever367c8c72008-06-30 18:58:14 -0400450nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
Wendy Cheng4373ea82008-01-17 11:10:12 -0500451{
452 int ret;
Wendy Cheng4373ea82008-01-17 11:10:12 -0500453
Chuck Lever367c8c72008-06-30 18:58:14 -0400454 ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
455 return ret ? -EIO : 0;
Wendy Cheng4373ea82008-01-17 11:10:12 -0500456}
457EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);