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1/*
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
9#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/time.h>
12#include <linux/in.h>
13#include <linux/slab.h>
14#include <linux/mutex.h>
15#include <linux/sunrpc/svc.h>
16#include <linux/sunrpc/addr.h>
17#include <linux/nfsd/nfsfh.h>
18#include <linux/nfsd/export.h>
19#include <linux/lockd/lockd.h>
20#include <linux/lockd/share.h>
21#include <linux/module.h>
22#include <linux/mount.h>
23
24#define NLMDBG_FACILITY NLMDBG_SVCSUBS
25
26
27/*
28 * Global file hash table
29 */
30#define FILE_HASH_BITS 7
31#define FILE_NRHASH (1<<FILE_HASH_BITS)
32static struct hlist_head nlm_files[FILE_NRHASH];
33static DEFINE_MUTEX(nlm_file_mutex);
34
35#ifdef NFSD_DEBUG
36static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
37{
38 u32 *fhp = (u32*)f->data;
39
40 /* print the first 32 bytes of the fh */
41 dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
42 msg, fhp[0], fhp[1], fhp[2], fhp[3],
43 fhp[4], fhp[5], fhp[6], fhp[7]);
44}
45
46static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
47{
48 struct inode *inode = file_inode(file->f_file);
49
50 dprintk("lockd: %s %s/%ld\n",
51 msg, inode->i_sb->s_id, inode->i_ino);
52}
53#else
54static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
55{
56 return;
57}
58
59static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
60{
61 return;
62}
63#endif
64
65static inline unsigned int file_hash(struct nfs_fh *f)
66{
67 unsigned int tmp=0;
68 int i;
69 for (i=0; i<NFS2_FHSIZE;i++)
70 tmp += f->data[i];
71 return tmp & (FILE_NRHASH - 1);
72}
73
74/*
75 * Lookup file info. If it doesn't exist, create a file info struct
76 * and open a (VFS) file for the given inode.
77 *
78 * FIXME:
79 * Note that we open the file O_RDONLY even when creating write locks.
80 * This is not quite right, but for now, we assume the client performs
81 * the proper R/W checking.
82 */
83__be32
84nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
85 struct nfs_fh *f)
86{
87 struct nlm_file *file;
88 unsigned int hash;
89 __be32 nfserr;
90
91 nlm_debug_print_fh("nlm_lookup_file", f);
92
93 hash = file_hash(f);
94
95 /* Lock file table */
96 mutex_lock(&nlm_file_mutex);
97
98 hlist_for_each_entry(file, &nlm_files[hash], f_list)
99 if (!nfs_compare_fh(&file->f_handle, f))
100 goto found;
101
102 nlm_debug_print_fh("creating file for", f);
103
104 nfserr = nlm_lck_denied_nolocks;
105 file = kzalloc(sizeof(*file), GFP_KERNEL);
106 if (!file)
107 goto out_unlock;
108
109 memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
110 mutex_init(&file->f_mutex);
111 INIT_HLIST_NODE(&file->f_list);
112 INIT_LIST_HEAD(&file->f_blocks);
113
114 /* Open the file. Note that this must not sleep for too long, else
115 * we would lock up lockd:-) So no NFS re-exports, folks.
116 *
117 * We have to make sure we have the right credential to open
118 * the file.
119 */
120 if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
121 dprintk("lockd: open failed (error %d)\n", nfserr);
122 goto out_free;
123 }
124
125 hlist_add_head(&file->f_list, &nlm_files[hash]);
126
127found:
128 dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
129 *result = file;
130 file->f_count++;
131 nfserr = 0;
132
133out_unlock:
134 mutex_unlock(&nlm_file_mutex);
135 return nfserr;
136
137out_free:
138 kfree(file);
139 goto out_unlock;
140}
141
142/*
143 * Delete a file after having released all locks, blocks and shares
144 */
145static inline void
146nlm_delete_file(struct nlm_file *file)
147{
148 nlm_debug_print_file("closing file", file);
149 if (!hlist_unhashed(&file->f_list)) {
150 hlist_del(&file->f_list);
151 nlmsvc_ops->fclose(file->f_file);
152 kfree(file);
153 } else {
154 printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
155 }
156}
157
158/*
159 * Loop over all locks on the given file and perform the specified
160 * action.
161 */
162static int
163nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
164 nlm_host_match_fn_t match)
165{
166 struct inode *inode = nlmsvc_file_inode(file);
167 struct file_lock *fl;
168 struct nlm_host *lockhost;
169
170again:
171 file->f_locks = 0;
172 spin_lock(&inode->i_lock);
173 for (fl = inode->i_flock; fl; fl = fl->fl_next) {
174 if (fl->fl_lmops != &nlmsvc_lock_operations)
175 continue;
176
177 /* update current lock count */
178 file->f_locks++;
179
180 lockhost = (struct nlm_host *) fl->fl_owner;
181 if (match(lockhost, host)) {
182 struct file_lock lock = *fl;
183
184 spin_unlock(&inode->i_lock);
185 lock.fl_type = F_UNLCK;
186 lock.fl_start = 0;
187 lock.fl_end = OFFSET_MAX;
188 if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
189 printk("lockd: unlock failure in %s:%d\n",
190 __FILE__, __LINE__);
191 return 1;
192 }
193 goto again;
194 }
195 }
196 spin_unlock(&inode->i_lock);
197
198 return 0;
199}
200
201static int
202nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
203{
204 return 1;
205}
206
207/*
208 * Inspect a single file
209 */
210static inline int
211nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
212{
213 nlmsvc_traverse_blocks(host, file, match);
214 nlmsvc_traverse_shares(host, file, match);
215 return nlm_traverse_locks(host, file, match);
216}
217
218/*
219 * Quick check whether there are still any locks, blocks or
220 * shares on a given file.
221 */
222static inline int
223nlm_file_inuse(struct nlm_file *file)
224{
225 struct inode *inode = nlmsvc_file_inode(file);
226 struct file_lock *fl;
227
228 if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
229 return 1;
230
231 spin_lock(&inode->i_lock);
232 for (fl = inode->i_flock; fl; fl = fl->fl_next) {
233 if (fl->fl_lmops == &nlmsvc_lock_operations) {
234 spin_unlock(&inode->i_lock);
235 return 1;
236 }
237 }
238 spin_unlock(&inode->i_lock);
239 file->f_locks = 0;
240 return 0;
241}
242
243/*
244 * Loop over all files in the file table.
245 */
246static int
247nlm_traverse_files(void *data, nlm_host_match_fn_t match,
248 int (*is_failover_file)(void *data, struct nlm_file *file))
249{
250 struct hlist_node *next;
251 struct nlm_file *file;
252 int i, ret = 0;
253
254 mutex_lock(&nlm_file_mutex);
255 for (i = 0; i < FILE_NRHASH; i++) {
256 hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
257 if (is_failover_file && !is_failover_file(data, file))
258 continue;
259 file->f_count++;
260 mutex_unlock(&nlm_file_mutex);
261
262 /* Traverse locks, blocks and shares of this file
263 * and update file->f_locks count */
264 if (nlm_inspect_file(data, file, match))
265 ret = 1;
266
267 mutex_lock(&nlm_file_mutex);
268 file->f_count--;
269 /* No more references to this file. Let go of it. */
270 if (list_empty(&file->f_blocks) && !file->f_locks
271 && !file->f_shares && !file->f_count) {
272 hlist_del(&file->f_list);
273 nlmsvc_ops->fclose(file->f_file);
274 kfree(file);
275 }
276 }
277 }
278 mutex_unlock(&nlm_file_mutex);
279 return ret;
280}
281
282/*
283 * Release file. If there are no more remote locks on this file,
284 * close it and free the handle.
285 *
286 * Note that we can't do proper reference counting without major
287 * contortions because the code in fs/locks.c creates, deletes and
288 * splits locks without notification. Our only way is to walk the
289 * entire lock list each time we remove a lock.
290 */
291void
292nlm_release_file(struct nlm_file *file)
293{
294 dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
295 file, file->f_count);
296
297 /* Lock file table */
298 mutex_lock(&nlm_file_mutex);
299
300 /* If there are no more locks etc, delete the file */
301 if (--file->f_count == 0 && !nlm_file_inuse(file))
302 nlm_delete_file(file);
303
304 mutex_unlock(&nlm_file_mutex);
305}
306
307/*
308 * Helpers function for resource traversal
309 *
310 * nlmsvc_mark_host:
311 * used by the garbage collector; simply sets h_inuse only for those
312 * hosts, which passed network check.
313 * Always returns 0.
314 *
315 * nlmsvc_same_host:
316 * returns 1 iff the two hosts match. Used to release
317 * all resources bound to a specific host.
318 *
319 * nlmsvc_is_client:
320 * returns 1 iff the host is a client.
321 * Used by nlmsvc_invalidate_all
322 */
323
324static int
325nlmsvc_mark_host(void *data, struct nlm_host *hint)
326{
327 struct nlm_host *host = data;
328
329 if ((hint->net == NULL) ||
330 (host->net == hint->net))
331 host->h_inuse = 1;
332 return 0;
333}
334
335static int
336nlmsvc_same_host(void *data, struct nlm_host *other)
337{
338 struct nlm_host *host = data;
339
340 return host == other;
341}
342
343static int
344nlmsvc_is_client(void *data, struct nlm_host *dummy)
345{
346 struct nlm_host *host = data;
347
348 if (host->h_server) {
349 /* we are destroying locks even though the client
350 * hasn't asked us too, so don't unmonitor the
351 * client
352 */
353 if (host->h_nsmhandle)
354 host->h_nsmhandle->sm_sticky = 1;
355 return 1;
356 } else
357 return 0;
358}
359
360/*
361 * Mark all hosts that still hold resources
362 */
363void
364nlmsvc_mark_resources(struct net *net)
365{
366 struct nlm_host hint;
367
368 dprintk("lockd: nlmsvc_mark_resources for net %p\n", net);
369 hint.net = net;
370 nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
371}
372
373/*
374 * Release all resources held by the given client
375 */
376void
377nlmsvc_free_host_resources(struct nlm_host *host)
378{
379 dprintk("lockd: nlmsvc_free_host_resources\n");
380
381 if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
382 printk(KERN_WARNING
383 "lockd: couldn't remove all locks held by %s\n",
384 host->h_name);
385 BUG();
386 }
387}
388
389/**
390 * nlmsvc_invalidate_all - remove all locks held for clients
391 *
392 * Release all locks held by NFS clients.
393 *
394 */
395void
396nlmsvc_invalidate_all(void)
397{
398 /*
399 * Previously, the code would call
400 * nlmsvc_free_host_resources for each client in
401 * turn, which is about as inefficient as it gets.
402 * Now we just do it once in nlm_traverse_files.
403 */
404 nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
405}
406
407static int
408nlmsvc_match_sb(void *datap, struct nlm_file *file)
409{
410 struct super_block *sb = datap;
411
412 return sb == file->f_file->f_path.dentry->d_sb;
413}
414
415/**
416 * nlmsvc_unlock_all_by_sb - release locks held on this file system
417 * @sb: super block
418 *
419 * Release all locks held by clients accessing this file system.
420 */
421int
422nlmsvc_unlock_all_by_sb(struct super_block *sb)
423{
424 int ret;
425
426 ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
427 return ret ? -EIO : 0;
428}
429EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
430
431static int
432nlmsvc_match_ip(void *datap, struct nlm_host *host)
433{
434 return rpc_cmp_addr(nlm_srcaddr(host), datap);
435}
436
437/**
438 * nlmsvc_unlock_all_by_ip - release local locks by IP address
439 * @server_addr: server's IP address as seen by clients
440 *
441 * Release all locks held by clients accessing this host
442 * via the passed in IP address.
443 */
444int
445nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
446{
447 int ret;
448
449 ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
450 return ret ? -EIO : 0;
451}
452EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/lockd/svcsubs.c
4 *
5 * Various support routines for the NLM server.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10#include <linux/types.h>
11#include <linux/string.h>
12#include <linux/time.h>
13#include <linux/in.h>
14#include <linux/slab.h>
15#include <linux/mutex.h>
16#include <linux/sunrpc/svc.h>
17#include <linux/sunrpc/addr.h>
18#include <linux/lockd/lockd.h>
19#include <linux/lockd/share.h>
20#include <linux/module.h>
21#include <linux/mount.h>
22#include <uapi/linux/nfs2.h>
23
24#define NLMDBG_FACILITY NLMDBG_SVCSUBS
25
26
27/*
28 * Global file hash table
29 */
30#define FILE_HASH_BITS 7
31#define FILE_NRHASH (1<<FILE_HASH_BITS)
32static struct hlist_head nlm_files[FILE_NRHASH];
33static DEFINE_MUTEX(nlm_file_mutex);
34
35#ifdef CONFIG_SUNRPC_DEBUG
36static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
37{
38 u32 *fhp = (u32*)f->data;
39
40 /* print the first 32 bytes of the fh */
41 dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
42 msg, fhp[0], fhp[1], fhp[2], fhp[3],
43 fhp[4], fhp[5], fhp[6], fhp[7]);
44}
45
46static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
47{
48 struct inode *inode = locks_inode(file->f_file);
49
50 dprintk("lockd: %s %s/%ld\n",
51 msg, inode->i_sb->s_id, inode->i_ino);
52}
53#else
54static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
55{
56 return;
57}
58
59static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
60{
61 return;
62}
63#endif
64
65static inline unsigned int file_hash(struct nfs_fh *f)
66{
67 unsigned int tmp=0;
68 int i;
69 for (i=0; i<NFS2_FHSIZE;i++)
70 tmp += f->data[i];
71 return tmp & (FILE_NRHASH - 1);
72}
73
74/*
75 * Lookup file info. If it doesn't exist, create a file info struct
76 * and open a (VFS) file for the given inode.
77 *
78 * FIXME:
79 * Note that we open the file O_RDONLY even when creating write locks.
80 * This is not quite right, but for now, we assume the client performs
81 * the proper R/W checking.
82 */
83__be32
84nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
85 struct nfs_fh *f)
86{
87 struct nlm_file *file;
88 unsigned int hash;
89 __be32 nfserr;
90
91 nlm_debug_print_fh("nlm_lookup_file", f);
92
93 hash = file_hash(f);
94
95 /* Lock file table */
96 mutex_lock(&nlm_file_mutex);
97
98 hlist_for_each_entry(file, &nlm_files[hash], f_list)
99 if (!nfs_compare_fh(&file->f_handle, f))
100 goto found;
101
102 nlm_debug_print_fh("creating file for", f);
103
104 nfserr = nlm_lck_denied_nolocks;
105 file = kzalloc(sizeof(*file), GFP_KERNEL);
106 if (!file)
107 goto out_unlock;
108
109 memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
110 mutex_init(&file->f_mutex);
111 INIT_HLIST_NODE(&file->f_list);
112 INIT_LIST_HEAD(&file->f_blocks);
113
114 /* Open the file. Note that this must not sleep for too long, else
115 * we would lock up lockd:-) So no NFS re-exports, folks.
116 *
117 * We have to make sure we have the right credential to open
118 * the file.
119 */
120 if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
121 dprintk("lockd: open failed (error %d)\n", nfserr);
122 goto out_free;
123 }
124
125 hlist_add_head(&file->f_list, &nlm_files[hash]);
126
127found:
128 dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
129 *result = file;
130 file->f_count++;
131 nfserr = 0;
132
133out_unlock:
134 mutex_unlock(&nlm_file_mutex);
135 return nfserr;
136
137out_free:
138 kfree(file);
139 goto out_unlock;
140}
141
142/*
143 * Delete a file after having released all locks, blocks and shares
144 */
145static inline void
146nlm_delete_file(struct nlm_file *file)
147{
148 nlm_debug_print_file("closing file", file);
149 if (!hlist_unhashed(&file->f_list)) {
150 hlist_del(&file->f_list);
151 nlmsvc_ops->fclose(file->f_file);
152 kfree(file);
153 } else {
154 printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
155 }
156}
157
158/*
159 * Loop over all locks on the given file and perform the specified
160 * action.
161 */
162static int
163nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
164 nlm_host_match_fn_t match)
165{
166 struct inode *inode = nlmsvc_file_inode(file);
167 struct file_lock *fl;
168 struct file_lock_context *flctx = inode->i_flctx;
169 struct nlm_host *lockhost;
170
171 if (!flctx || list_empty_careful(&flctx->flc_posix))
172 return 0;
173again:
174 file->f_locks = 0;
175 spin_lock(&flctx->flc_lock);
176 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
177 if (fl->fl_lmops != &nlmsvc_lock_operations)
178 continue;
179
180 /* update current lock count */
181 file->f_locks++;
182
183 lockhost = ((struct nlm_lockowner *)fl->fl_owner)->host;
184 if (match(lockhost, host)) {
185 struct file_lock lock = *fl;
186
187 spin_unlock(&flctx->flc_lock);
188 lock.fl_type = F_UNLCK;
189 lock.fl_start = 0;
190 lock.fl_end = OFFSET_MAX;
191 if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
192 printk("lockd: unlock failure in %s:%d\n",
193 __FILE__, __LINE__);
194 return 1;
195 }
196 goto again;
197 }
198 }
199 spin_unlock(&flctx->flc_lock);
200
201 return 0;
202}
203
204static int
205nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
206{
207 return 1;
208}
209
210/*
211 * Inspect a single file
212 */
213static inline int
214nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
215{
216 nlmsvc_traverse_blocks(host, file, match);
217 nlmsvc_traverse_shares(host, file, match);
218 return nlm_traverse_locks(host, file, match);
219}
220
221/*
222 * Quick check whether there are still any locks, blocks or
223 * shares on a given file.
224 */
225static inline int
226nlm_file_inuse(struct nlm_file *file)
227{
228 struct inode *inode = nlmsvc_file_inode(file);
229 struct file_lock *fl;
230 struct file_lock_context *flctx = inode->i_flctx;
231
232 if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
233 return 1;
234
235 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
236 spin_lock(&flctx->flc_lock);
237 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
238 if (fl->fl_lmops == &nlmsvc_lock_operations) {
239 spin_unlock(&flctx->flc_lock);
240 return 1;
241 }
242 }
243 spin_unlock(&flctx->flc_lock);
244 }
245 file->f_locks = 0;
246 return 0;
247}
248
249/*
250 * Loop over all files in the file table.
251 */
252static int
253nlm_traverse_files(void *data, nlm_host_match_fn_t match,
254 int (*is_failover_file)(void *data, struct nlm_file *file))
255{
256 struct hlist_node *next;
257 struct nlm_file *file;
258 int i, ret = 0;
259
260 mutex_lock(&nlm_file_mutex);
261 for (i = 0; i < FILE_NRHASH; i++) {
262 hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
263 if (is_failover_file && !is_failover_file(data, file))
264 continue;
265 file->f_count++;
266 mutex_unlock(&nlm_file_mutex);
267
268 /* Traverse locks, blocks and shares of this file
269 * and update file->f_locks count */
270 if (nlm_inspect_file(data, file, match))
271 ret = 1;
272
273 mutex_lock(&nlm_file_mutex);
274 file->f_count--;
275 /* No more references to this file. Let go of it. */
276 if (list_empty(&file->f_blocks) && !file->f_locks
277 && !file->f_shares && !file->f_count) {
278 hlist_del(&file->f_list);
279 nlmsvc_ops->fclose(file->f_file);
280 kfree(file);
281 }
282 }
283 }
284 mutex_unlock(&nlm_file_mutex);
285 return ret;
286}
287
288/*
289 * Release file. If there are no more remote locks on this file,
290 * close it and free the handle.
291 *
292 * Note that we can't do proper reference counting without major
293 * contortions because the code in fs/locks.c creates, deletes and
294 * splits locks without notification. Our only way is to walk the
295 * entire lock list each time we remove a lock.
296 */
297void
298nlm_release_file(struct nlm_file *file)
299{
300 dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
301 file, file->f_count);
302
303 /* Lock file table */
304 mutex_lock(&nlm_file_mutex);
305
306 /* If there are no more locks etc, delete the file */
307 if (--file->f_count == 0 && !nlm_file_inuse(file))
308 nlm_delete_file(file);
309
310 mutex_unlock(&nlm_file_mutex);
311}
312
313/*
314 * Helpers function for resource traversal
315 *
316 * nlmsvc_mark_host:
317 * used by the garbage collector; simply sets h_inuse only for those
318 * hosts, which passed network check.
319 * Always returns 0.
320 *
321 * nlmsvc_same_host:
322 * returns 1 iff the two hosts match. Used to release
323 * all resources bound to a specific host.
324 *
325 * nlmsvc_is_client:
326 * returns 1 iff the host is a client.
327 * Used by nlmsvc_invalidate_all
328 */
329
330static int
331nlmsvc_mark_host(void *data, struct nlm_host *hint)
332{
333 struct nlm_host *host = data;
334
335 if ((hint->net == NULL) ||
336 (host->net == hint->net))
337 host->h_inuse = 1;
338 return 0;
339}
340
341static int
342nlmsvc_same_host(void *data, struct nlm_host *other)
343{
344 struct nlm_host *host = data;
345
346 return host == other;
347}
348
349static int
350nlmsvc_is_client(void *data, struct nlm_host *dummy)
351{
352 struct nlm_host *host = data;
353
354 if (host->h_server) {
355 /* we are destroying locks even though the client
356 * hasn't asked us too, so don't unmonitor the
357 * client
358 */
359 if (host->h_nsmhandle)
360 host->h_nsmhandle->sm_sticky = 1;
361 return 1;
362 } else
363 return 0;
364}
365
366/*
367 * Mark all hosts that still hold resources
368 */
369void
370nlmsvc_mark_resources(struct net *net)
371{
372 struct nlm_host hint;
373
374 dprintk("lockd: %s for net %x\n", __func__, net ? net->ns.inum : 0);
375 hint.net = net;
376 nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
377}
378
379/*
380 * Release all resources held by the given client
381 */
382void
383nlmsvc_free_host_resources(struct nlm_host *host)
384{
385 dprintk("lockd: nlmsvc_free_host_resources\n");
386
387 if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
388 printk(KERN_WARNING
389 "lockd: couldn't remove all locks held by %s\n",
390 host->h_name);
391 BUG();
392 }
393}
394
395/**
396 * nlmsvc_invalidate_all - remove all locks held for clients
397 *
398 * Release all locks held by NFS clients.
399 *
400 */
401void
402nlmsvc_invalidate_all(void)
403{
404 /*
405 * Previously, the code would call
406 * nlmsvc_free_host_resources for each client in
407 * turn, which is about as inefficient as it gets.
408 * Now we just do it once in nlm_traverse_files.
409 */
410 nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
411}
412
413static int
414nlmsvc_match_sb(void *datap, struct nlm_file *file)
415{
416 struct super_block *sb = datap;
417
418 return sb == locks_inode(file->f_file)->i_sb;
419}
420
421/**
422 * nlmsvc_unlock_all_by_sb - release locks held on this file system
423 * @sb: super block
424 *
425 * Release all locks held by clients accessing this file system.
426 */
427int
428nlmsvc_unlock_all_by_sb(struct super_block *sb)
429{
430 int ret;
431
432 ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
433 return ret ? -EIO : 0;
434}
435EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
436
437static int
438nlmsvc_match_ip(void *datap, struct nlm_host *host)
439{
440 return rpc_cmp_addr(nlm_srcaddr(host), datap);
441}
442
443/**
444 * nlmsvc_unlock_all_by_ip - release local locks by IP address
445 * @server_addr: server's IP address as seen by clients
446 *
447 * Release all locks held by clients accessing this host
448 * via the passed in IP address.
449 */
450int
451nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
452{
453 int ret;
454
455 ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
456 return ret ? -EIO : 0;
457}
458EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);