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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
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
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
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81
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
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
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117
118
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
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
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159
160
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
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
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
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219
220
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
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
263
264 if (nlm_inspect_file(data, file, match))
265 ret = 1;
266
267 mutex_lock(&nlm_file_mutex);
268 file->f_count--;
269
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}
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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
298 mutex_lock(&nlm_file_mutex);
299
300
301 if (--file->f_count == 0 && !nlm_file_inuse(file))
302 nlm_delete_file(file);
303
304 mutex_unlock(&nlm_file_mutex);
305}
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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
350
351
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
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
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
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393
394
395void
396nlmsvc_invalidate_all(void)
397{
398
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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
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419
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
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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);
453