Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/string.h> | |
11 | #include <linux/time.h> | |
12 | #include <linux/in.h> | |
353ab6e9 | 13 | #include <linux/mutex.h> |
1da177e4 LT |
14 | #include <linux/sunrpc/svc.h> |
15 | #include <linux/sunrpc/clnt.h> | |
16 | #include <linux/nfsd/nfsfh.h> | |
17 | #include <linux/nfsd/export.h> | |
18 | #include <linux/lockd/lockd.h> | |
19 | #include <linux/lockd/share.h> | |
20 | #include <linux/lockd/sm_inter.h> | |
4373ea84 WC |
21 | #include <linux/module.h> |
22 | #include <linux/mount.h> | |
1da177e4 LT |
23 | |
24 | #define NLMDBG_FACILITY NLMDBG_SVCSUBS | |
25 | ||
26 | ||
27 | /* | |
28 | * Global file hash table | |
29 | */ | |
07ba8063 | 30 | #define FILE_HASH_BITS 7 |
1da177e4 | 31 | #define FILE_NRHASH (1<<FILE_HASH_BITS) |
07ba8063 | 32 | static struct hlist_head nlm_files[FILE_NRHASH]; |
353ab6e9 | 33 | static DEFINE_MUTEX(nlm_file_mutex); |
1da177e4 | 34 | |
0bbacc40 CL |
35 | #ifdef NFSD_DEBUG |
36 | static 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 | ||
46 | static inline void nlm_debug_print_file(char *msg, struct nlm_file *file) | |
47 | { | |
225a719f | 48 | struct inode *inode = file->f_file->f_path.dentry->d_inode; |
0bbacc40 CL |
49 | |
50 | dprintk("lockd: %s %s/%ld\n", | |
51 | msg, inode->i_sb->s_id, inode->i_ino); | |
52 | } | |
53 | #else | |
54 | static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f) | |
55 | { | |
56 | return; | |
57 | } | |
58 | ||
59 | static inline void nlm_debug_print_file(char *msg, struct nlm_file *file) | |
60 | { | |
61 | return; | |
62 | } | |
63 | #endif | |
64 | ||
1da177e4 LT |
65 | static 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 | */ | |
52921e02 | 83 | __be32 |
1da177e4 LT |
84 | nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result, |
85 | struct nfs_fh *f) | |
86 | { | |
07ba8063 | 87 | struct hlist_node *pos; |
1da177e4 LT |
88 | struct nlm_file *file; |
89 | unsigned int hash; | |
52921e02 | 90 | __be32 nfserr; |
1da177e4 | 91 | |
50431d94 | 92 | nlm_debug_print_fh("nlm_lookup_file", f); |
1da177e4 LT |
93 | |
94 | hash = file_hash(f); | |
95 | ||
96 | /* Lock file table */ | |
353ab6e9 | 97 | mutex_lock(&nlm_file_mutex); |
1da177e4 | 98 | |
07ba8063 | 99 | hlist_for_each_entry(file, pos, &nlm_files[hash], f_list) |
1da177e4 LT |
100 | if (!nfs_compare_fh(&file->f_handle, f)) |
101 | goto found; | |
102 | ||
0bbacc40 | 103 | nlm_debug_print_fh("creating file for", f); |
1da177e4 LT |
104 | |
105 | nfserr = nlm_lck_denied_nolocks; | |
f8314dc6 | 106 | file = kzalloc(sizeof(*file), GFP_KERNEL); |
1da177e4 LT |
107 | if (!file) |
108 | goto out_unlock; | |
109 | ||
1da177e4 | 110 | memcpy(&file->f_handle, f, sizeof(struct nfs_fh)); |
89e63ef6 | 111 | mutex_init(&file->f_mutex); |
07ba8063 | 112 | INIT_HLIST_NODE(&file->f_list); |
68a2d76c | 113 | INIT_LIST_HEAD(&file->f_blocks); |
1da177e4 LT |
114 | |
115 | /* Open the file. Note that this must not sleep for too long, else | |
116 | * we would lock up lockd:-) So no NFS re-exports, folks. | |
117 | * | |
118 | * We have to make sure we have the right credential to open | |
119 | * the file. | |
120 | */ | |
121 | if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) { | |
f0737a39 | 122 | dprintk("lockd: open failed (error %d)\n", nfserr); |
1da177e4 LT |
123 | goto out_free; |
124 | } | |
125 | ||
07ba8063 | 126 | hlist_add_head(&file->f_list, &nlm_files[hash]); |
1da177e4 LT |
127 | |
128 | found: | |
129 | dprintk("lockd: found file %p (count %d)\n", file, file->f_count); | |
130 | *result = file; | |
131 | file->f_count++; | |
132 | nfserr = 0; | |
133 | ||
134 | out_unlock: | |
353ab6e9 | 135 | mutex_unlock(&nlm_file_mutex); |
1da177e4 LT |
136 | return nfserr; |
137 | ||
138 | out_free: | |
139 | kfree(file); | |
1da177e4 LT |
140 | goto out_unlock; |
141 | } | |
142 | ||
143 | /* | |
144 | * Delete a file after having released all locks, blocks and shares | |
145 | */ | |
146 | static inline void | |
147 | nlm_delete_file(struct nlm_file *file) | |
148 | { | |
0bbacc40 | 149 | nlm_debug_print_file("closing file", file); |
07ba8063 OK |
150 | if (!hlist_unhashed(&file->f_list)) { |
151 | hlist_del(&file->f_list); | |
152 | nlmsvc_ops->fclose(file->f_file); | |
153 | kfree(file); | |
154 | } else { | |
155 | printk(KERN_WARNING "lockd: attempt to release unknown file!\n"); | |
1da177e4 | 156 | } |
1da177e4 LT |
157 | } |
158 | ||
159 | /* | |
160 | * Loop over all locks on the given file and perform the specified | |
161 | * action. | |
162 | */ | |
163 | static int | |
f2af793d OK |
164 | nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, |
165 | nlm_host_match_fn_t match) | |
1da177e4 LT |
166 | { |
167 | struct inode *inode = nlmsvc_file_inode(file); | |
168 | struct file_lock *fl; | |
169 | struct nlm_host *lockhost; | |
170 | ||
171 | again: | |
172 | file->f_locks = 0; | |
173 | for (fl = inode->i_flock; fl; fl = fl->fl_next) { | |
7117bf3d | 174 | if (fl->fl_lmops != &nlmsvc_lock_operations) |
1da177e4 LT |
175 | continue; |
176 | ||
177 | /* update current lock count */ | |
178 | file->f_locks++; | |
f2af793d | 179 | |
1da177e4 | 180 | lockhost = (struct nlm_host *) fl->fl_owner; |
f2af793d | 181 | if (match(lockhost, host)) { |
1da177e4 LT |
182 | struct file_lock lock = *fl; |
183 | ||
1da177e4 LT |
184 | lock.fl_type = F_UNLCK; |
185 | lock.fl_start = 0; | |
186 | lock.fl_end = OFFSET_MAX; | |
1a8322b2 | 187 | if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) { |
1da177e4 LT |
188 | printk("lockd: unlock failure in %s:%d\n", |
189 | __FILE__, __LINE__); | |
190 | return 1; | |
191 | } | |
192 | goto again; | |
193 | } | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
17efa372 WC |
199 | static int |
200 | nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2) | |
201 | { | |
202 | return 1; | |
203 | } | |
204 | ||
1da177e4 | 205 | /* |
f2af793d OK |
206 | * Inspect a single file |
207 | */ | |
208 | static inline int | |
209 | nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match) | |
210 | { | |
211 | nlmsvc_traverse_blocks(host, file, match); | |
212 | nlmsvc_traverse_shares(host, file, match); | |
213 | return nlm_traverse_locks(host, file, match); | |
214 | } | |
215 | ||
216 | /* | |
217 | * Quick check whether there are still any locks, blocks or | |
218 | * shares on a given file. | |
1da177e4 LT |
219 | */ |
220 | static inline int | |
f2af793d | 221 | nlm_file_inuse(struct nlm_file *file) |
1da177e4 | 222 | { |
f2af793d OK |
223 | struct inode *inode = nlmsvc_file_inode(file); |
224 | struct file_lock *fl; | |
225 | ||
226 | if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares) | |
227 | return 1; | |
228 | ||
229 | for (fl = inode->i_flock; fl; fl = fl->fl_next) { | |
230 | if (fl->fl_lmops == &nlmsvc_lock_operations) | |
1da177e4 | 231 | return 1; |
1da177e4 | 232 | } |
f2af793d OK |
233 | file->f_locks = 0; |
234 | return 0; | |
1da177e4 LT |
235 | } |
236 | ||
237 | /* | |
238 | * Loop over all files in the file table. | |
239 | */ | |
240 | static int | |
17efa372 WC |
241 | nlm_traverse_files(void *data, nlm_host_match_fn_t match, |
242 | int (*is_failover_file)(void *data, struct nlm_file *file)) | |
1da177e4 | 243 | { |
07ba8063 OK |
244 | struct hlist_node *pos, *next; |
245 | struct nlm_file *file; | |
01df9c5e | 246 | int i, ret = 0; |
1da177e4 | 247 | |
353ab6e9 | 248 | mutex_lock(&nlm_file_mutex); |
1da177e4 | 249 | for (i = 0; i < FILE_NRHASH; i++) { |
07ba8063 | 250 | hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) { |
17efa372 WC |
251 | if (is_failover_file && !is_failover_file(data, file)) |
252 | continue; | |
01df9c5e TM |
253 | file->f_count++; |
254 | mutex_unlock(&nlm_file_mutex); | |
255 | ||
1da177e4 LT |
256 | /* Traverse locks, blocks and shares of this file |
257 | * and update file->f_locks count */ | |
4373ea84 | 258 | if (nlm_inspect_file(data, file, match)) |
01df9c5e | 259 | ret = 1; |
1da177e4 | 260 | |
01df9c5e TM |
261 | mutex_lock(&nlm_file_mutex); |
262 | file->f_count--; | |
1da177e4 | 263 | /* No more references to this file. Let go of it. */ |
68a2d76c | 264 | if (list_empty(&file->f_blocks) && !file->f_locks |
1da177e4 | 265 | && !file->f_shares && !file->f_count) { |
07ba8063 | 266 | hlist_del(&file->f_list); |
1da177e4 LT |
267 | nlmsvc_ops->fclose(file->f_file); |
268 | kfree(file); | |
1da177e4 LT |
269 | } |
270 | } | |
271 | } | |
353ab6e9 | 272 | mutex_unlock(&nlm_file_mutex); |
01df9c5e | 273 | return ret; |
1da177e4 LT |
274 | } |
275 | ||
276 | /* | |
277 | * Release file. If there are no more remote locks on this file, | |
278 | * close it and free the handle. | |
279 | * | |
280 | * Note that we can't do proper reference counting without major | |
281 | * contortions because the code in fs/locks.c creates, deletes and | |
282 | * splits locks without notification. Our only way is to walk the | |
283 | * entire lock list each time we remove a lock. | |
284 | */ | |
285 | void | |
286 | nlm_release_file(struct nlm_file *file) | |
287 | { | |
288 | dprintk("lockd: nlm_release_file(%p, ct = %d)\n", | |
289 | file, file->f_count); | |
290 | ||
291 | /* Lock file table */ | |
353ab6e9 | 292 | mutex_lock(&nlm_file_mutex); |
1da177e4 LT |
293 | |
294 | /* If there are no more locks etc, delete the file */ | |
f2af793d OK |
295 | if (--file->f_count == 0 && !nlm_file_inuse(file)) |
296 | nlm_delete_file(file); | |
1da177e4 | 297 | |
353ab6e9 | 298 | mutex_unlock(&nlm_file_mutex); |
1da177e4 LT |
299 | } |
300 | ||
f2af793d OK |
301 | /* |
302 | * Helpers function for resource traversal | |
303 | * | |
304 | * nlmsvc_mark_host: | |
305 | * used by the garbage collector; simply sets h_inuse. | |
306 | * Always returns 0. | |
307 | * | |
308 | * nlmsvc_same_host: | |
309 | * returns 1 iff the two hosts match. Used to release | |
310 | * all resources bound to a specific host. | |
311 | * | |
312 | * nlmsvc_is_client: | |
313 | * returns 1 iff the host is a client. | |
314 | * Used by nlmsvc_invalidate_all | |
315 | */ | |
316 | static int | |
4373ea84 | 317 | nlmsvc_mark_host(void *data, struct nlm_host *dummy) |
f2af793d | 318 | { |
4373ea84 WC |
319 | struct nlm_host *host = data; |
320 | ||
f2af793d OK |
321 | host->h_inuse = 1; |
322 | return 0; | |
323 | } | |
324 | ||
325 | static int | |
4373ea84 | 326 | nlmsvc_same_host(void *data, struct nlm_host *other) |
f2af793d | 327 | { |
4373ea84 WC |
328 | struct nlm_host *host = data; |
329 | ||
f2af793d OK |
330 | return host == other; |
331 | } | |
332 | ||
333 | static int | |
4373ea84 | 334 | nlmsvc_is_client(void *data, struct nlm_host *dummy) |
f2af793d | 335 | { |
4373ea84 WC |
336 | struct nlm_host *host = data; |
337 | ||
4481d103 N |
338 | if (host->h_server) { |
339 | /* we are destroying locks even though the client | |
340 | * hasn't asked us too, so don't unmonitor the | |
341 | * client | |
342 | */ | |
343 | if (host->h_nsmhandle) | |
344 | host->h_nsmhandle->sm_sticky = 1; | |
345 | return 1; | |
346 | } else | |
347 | return 0; | |
f2af793d OK |
348 | } |
349 | ||
1da177e4 LT |
350 | /* |
351 | * Mark all hosts that still hold resources | |
352 | */ | |
353 | void | |
354 | nlmsvc_mark_resources(void) | |
355 | { | |
356 | dprintk("lockd: nlmsvc_mark_resources\n"); | |
17efa372 | 357 | nlm_traverse_files(NULL, nlmsvc_mark_host, NULL); |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * Release all resources held by the given client | |
362 | */ | |
363 | void | |
364 | nlmsvc_free_host_resources(struct nlm_host *host) | |
365 | { | |
366 | dprintk("lockd: nlmsvc_free_host_resources\n"); | |
367 | ||
17efa372 | 368 | if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) { |
1da177e4 | 369 | printk(KERN_WARNING |
f0737a39 | 370 | "lockd: couldn't remove all locks held by %s\n", |
1da177e4 | 371 | host->h_name); |
f0737a39 OK |
372 | BUG(); |
373 | } | |
1da177e4 LT |
374 | } |
375 | ||
376 | /* | |
350fce8d | 377 | * Remove all locks held for clients |
1da177e4 LT |
378 | */ |
379 | void | |
380 | nlmsvc_invalidate_all(void) | |
381 | { | |
f2af793d OK |
382 | /* Release all locks held by NFS clients. |
383 | * Previously, the code would call | |
384 | * nlmsvc_free_host_resources for each client in | |
385 | * turn, which is about as inefficient as it gets. | |
386 | * Now we just do it once in nlm_traverse_files. | |
387 | */ | |
17efa372 WC |
388 | nlm_traverse_files(NULL, nlmsvc_is_client, NULL); |
389 | } | |
390 | ||
391 | static int | |
392 | nlmsvc_match_sb(void *datap, struct nlm_file *file) | |
393 | { | |
394 | struct super_block *sb = datap; | |
395 | ||
396 | return sb == file->f_file->f_path.mnt->mnt_sb; | |
397 | } | |
398 | ||
399 | int | |
400 | nlmsvc_unlock_all_by_sb(struct super_block *sb) | |
401 | { | |
402 | int ret; | |
403 | ||
404 | ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb); | |
405 | return ret ? -EIO : 0; | |
1da177e4 | 406 | } |
17efa372 | 407 | EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb); |
4373ea84 WC |
408 | |
409 | static int | |
410 | nlmsvc_match_ip(void *datap, struct nlm_host *host) | |
411 | { | |
412 | __be32 *server_addr = datap; | |
413 | ||
414 | return host->h_saddr.sin_addr.s_addr == *server_addr; | |
415 | } | |
416 | ||
417 | int | |
418 | nlmsvc_unlock_all_by_ip(__be32 server_addr) | |
419 | { | |
420 | int ret; | |
17efa372 | 421 | ret = nlm_traverse_files(&server_addr, nlmsvc_match_ip, NULL); |
4373ea84 WC |
422 | return ret ? -EIO : 0; |
423 | ||
424 | } | |
425 | EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip); |