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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/lockd/lockd.h>
18#include <linux/lockd/share.h>
19#include <linux/module.h>
20#include <linux/mount.h>
21#include <uapi/linux/nfs2.h>
22
23#define NLMDBG_FACILITY NLMDBG_SVCSUBS
24
25
26
27
28
29#define FILE_HASH_BITS 7
30#define FILE_NRHASH (1<<FILE_HASH_BITS)
31static struct hlist_head nlm_files[FILE_NRHASH];
32static DEFINE_MUTEX(nlm_file_mutex);
33
34#ifdef CONFIG_SUNRPC_DEBUG
35static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
36{
37 u32 *fhp = (u32*)f->data;
38
39
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{
47 struct inode *inode = locks_inode(file->f_file);
48
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
64static 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
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80
81
82__be32
83nlm_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;
88 __be32 nfserr;
89
90 nlm_debug_print_fh("nlm_lookup_file", f);
91
92 hash = file_hash(f);
93
94
95 mutex_lock(&nlm_file_mutex);
96
97 hlist_for_each_entry(file, &nlm_files[hash], f_list)
98 if (!nfs_compare_fh(&file->f_handle, f))
99 goto found;
100
101 nlm_debug_print_fh("creating file for", f);
102
103 nfserr = nlm_lck_denied_nolocks;
104 file = kzalloc(sizeof(*file), GFP_KERNEL);
105 if (!file)
106 goto out_unlock;
107
108 memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
109 mutex_init(&file->f_mutex);
110 INIT_HLIST_NODE(&file->f_list);
111 INIT_LIST_HEAD(&file->f_blocks);
112
113
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116
117
118
119 if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
120 dprintk("lockd: open failed (error %d)\n", nfserr);
121 goto out_free;
122 }
123
124 hlist_add_head(&file->f_list, &nlm_files[hash]);
125
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:
133 mutex_unlock(&nlm_file_mutex);
134 return nfserr;
135
136out_free:
137 kfree(file);
138 goto out_unlock;
139}
140
141
142
143
144static inline void
145nlm_delete_file(struct nlm_file *file)
146{
147 nlm_debug_print_file("closing file", file);
148 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");
154 }
155}
156
157
158
159
160
161static int
162nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
163 nlm_host_match_fn_t match)
164{
165 struct inode *inode = nlmsvc_file_inode(file);
166 struct file_lock *fl;
167 struct nlm_host *lockhost;
168
169again:
170 file->f_locks = 0;
171 spin_lock(&inode->i_lock);
172 for (fl = inode->i_flock; fl; fl = fl->fl_next) {
173 if (fl->fl_lmops != &nlmsvc_lock_operations)
174 continue;
175
176
177 file->f_locks++;
178
179 lockhost = (struct nlm_host *) fl->fl_owner;
180 if (match(lockhost, host)) {
181 struct file_lock lock = *fl;
182
183 spin_unlock(&inode->i_lock);
184 lock.fl_type = F_UNLCK;
185 lock.fl_start = 0;
186 lock.fl_end = OFFSET_MAX;
187 if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
188 printk("lockd: unlock failure in %s:%d\n",
189 __FILE__, __LINE__);
190 return 1;
191 }
192 goto again;
193 }
194 }
195 spin_unlock(&inode->i_lock);
196
197 return 0;
198}
199
200static int
201nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
202{
203 return 1;
204}
205
206
207
208
209static inline int
210nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
211{
212 nlmsvc_traverse_blocks(host, file, match);
213 nlmsvc_traverse_shares(host, file, match);
214 return nlm_traverse_locks(host, file, match);
215}
216
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218
219
220
221static inline int
222nlm_file_inuse(struct nlm_file *file)
223{
224 struct inode *inode = nlmsvc_file_inode(file);
225 struct file_lock *fl;
226
227 if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
228 return 1;
229
230 spin_lock(&inode->i_lock);
231 for (fl = inode->i_flock; fl; fl = fl->fl_next) {
232 if (fl->fl_lmops == &nlmsvc_lock_operations) {
233 spin_unlock(&inode->i_lock);
234 return 1;
235 }
236 }
237 spin_unlock(&inode->i_lock);
238 file->f_locks = 0;
239 return 0;
240}
241
242
243
244
245static int
246nlm_traverse_files(void *data, nlm_host_match_fn_t match,
247 int (*is_failover_file)(void *data, struct nlm_file *file))
248{
249 struct hlist_node *next;
250 struct nlm_file *file;
251 int i, ret = 0;
252
253 mutex_lock(&nlm_file_mutex);
254 for (i = 0; i < FILE_NRHASH; i++) {
255 hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
256 if (is_failover_file && !is_failover_file(data, file))
257 continue;
258 file->f_count++;
259 mutex_unlock(&nlm_file_mutex);
260
261
262
263 if (nlm_inspect_file(data, file, match))
264 ret = 1;
265
266 mutex_lock(&nlm_file_mutex);
267 file->f_count--;
268
269 if (list_empty(&file->f_blocks) && !file->f_locks
270 && !file->f_shares && !file->f_count) {
271 hlist_del(&file->f_list);
272 nlmsvc_ops->fclose(file->f_file);
273 kfree(file);
274 }
275 }
276 }
277 mutex_unlock(&nlm_file_mutex);
278 return ret;
279}
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289
290void
291nlm_release_file(struct nlm_file *file)
292{
293 dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
294 file, file->f_count);
295
296
297 mutex_lock(&nlm_file_mutex);
298
299
300 if (--file->f_count == 0 && !nlm_file_inuse(file))
301 nlm_delete_file(file);
302
303 mutex_unlock(&nlm_file_mutex);
304}
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323static int
324nlmsvc_mark_host(void *data, struct nlm_host *hint)
325{
326 struct nlm_host *host = data;
327
328 if ((hint->net == NULL) ||
329 (host->net == hint->net))
330 host->h_inuse = 1;
331 return 0;
332}
333
334static int
335nlmsvc_same_host(void *data, struct nlm_host *other)
336{
337 struct nlm_host *host = data;
338
339 return host == other;
340}
341
342static int
343nlmsvc_is_client(void *data, struct nlm_host *dummy)
344{
345 struct nlm_host *host = data;
346
347 if (host->h_server) {
348
349
350
351
352 if (host->h_nsmhandle)
353 host->h_nsmhandle->sm_sticky = 1;
354 return 1;
355 } else
356 return 0;
357}
358
359
360
361
362void
363nlmsvc_mark_resources(struct net *net)
364{
365 struct nlm_host hint;
366
367 dprintk("lockd: nlmsvc_mark_resources for net %p\n", net);
368 hint.net = net;
369 nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
370}
371
372
373
374
375void
376nlmsvc_free_host_resources(struct nlm_host *host)
377{
378 dprintk("lockd: nlmsvc_free_host_resources\n");
379
380 if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
381 printk(KERN_WARNING
382 "lockd: couldn't remove all locks held by %s\n",
383 host->h_name);
384 BUG();
385 }
386}
387
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393
394void
395nlmsvc_invalidate_all(void)
396{
397
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401
402
403 nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
404}
405
406static int
407nlmsvc_match_sb(void *datap, struct nlm_file *file)
408{
409 struct super_block *sb = datap;
410
411 return sb == locks_inode(file->f_file)->i_sb;
412}
413
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418
419
420int
421nlmsvc_unlock_all_by_sb(struct super_block *sb)
422{
423 int ret;
424
425 ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
426 return ret ? -EIO : 0;
427}
428EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
429
430static int
431nlmsvc_match_ip(void *datap, struct nlm_host *host)
432{
433 return rpc_cmp_addr(nlm_srcaddr(host), datap);
434}
435
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442
443int
444nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
445{
446 int ret;
447
448 ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
449 return ret ? -EIO : 0;
450}
451EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
452