diff options
author | Evgeniy Polyakov <zbr@ioremap.net> | 2012-02-08 18:44:50 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-08 19:19:06 -0500 |
commit | 67435319866f89b55721fc88ca0dbda51629e3d6 (patch) | |
tree | 638d70e7420b478e449e83da757df69f7c7f921e /drivers/staging/pohmelfs/netfs.h | |
parent | 203209ef77e4d5f0ee729557b09770bce0c2d251 (diff) |
staging: pohmelfs: remove drivers/staging/pohmelfs
New pohmelfs is coming, and it is time to remove deadly old design
https://lkml.org/lkml/2012/2/8/293
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/pohmelfs/netfs.h')
-rw-r--r-- | drivers/staging/pohmelfs/netfs.h | 919 |
1 files changed, 0 insertions, 919 deletions
diff --git a/drivers/staging/pohmelfs/netfs.h b/drivers/staging/pohmelfs/netfs.h deleted file mode 100644 index f26894f2a57..00000000000 --- a/drivers/staging/pohmelfs/netfs.h +++ /dev/null | |||
@@ -1,919 +0,0 @@ | |||
1 | /* | ||
2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> | ||
3 | * All rights reserved. | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; either version 2 of the License, or | ||
8 | * (at your option) any later version. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | */ | ||
15 | |||
16 | #ifndef __NETFS_H | ||
17 | #define __NETFS_H | ||
18 | |||
19 | #include <linux/types.h> | ||
20 | #include <linux/connector.h> | ||
21 | #include <linux/backing-dev.h> | ||
22 | |||
23 | #define POHMELFS_CN_IDX 5 | ||
24 | #define POHMELFS_CN_VAL 0 | ||
25 | |||
26 | #define POHMELFS_CTLINFO_ACK 1 | ||
27 | #define POHMELFS_NOINFO_ACK 2 | ||
28 | |||
29 | #define POHMELFS_NULL_IDX 65535 | ||
30 | |||
31 | /* | ||
32 | * Network command structure. | ||
33 | * Will be extended. | ||
34 | */ | ||
35 | struct netfs_cmd { | ||
36 | __u16 cmd; /* Command number */ | ||
37 | __u16 csize; /* Attached crypto information size */ | ||
38 | __u16 cpad; /* Attached padding size */ | ||
39 | __u16 ext; /* External flags */ | ||
40 | __u32 size; /* Size of the attached data */ | ||
41 | __u32 trans; /* Transaction id */ | ||
42 | __u64 id; /* Object ID to operate on. Used for feedback.*/ | ||
43 | __u64 start; /* Start of the object. */ | ||
44 | __u64 iv; /* IV sequence */ | ||
45 | __u8 data[0]; | ||
46 | }; | ||
47 | |||
48 | static inline void netfs_convert_cmd(struct netfs_cmd *cmd) | ||
49 | { | ||
50 | cmd->id = __be64_to_cpu(cmd->id); | ||
51 | cmd->start = __be64_to_cpu(cmd->start); | ||
52 | cmd->iv = __be64_to_cpu(cmd->iv); | ||
53 | cmd->cmd = __be16_to_cpu(cmd->cmd); | ||
54 | cmd->ext = __be16_to_cpu(cmd->ext); | ||
55 | cmd->csize = __be16_to_cpu(cmd->csize); | ||
56 | cmd->cpad = __be16_to_cpu(cmd->cpad); | ||
57 | cmd->size = __be32_to_cpu(cmd->size); | ||
58 | } | ||
59 | |||
60 | #define NETFS_TRANS_SINGLE_DST (1<<0) | ||
61 | |||
62 | enum { | ||
63 | NETFS_READDIR = 1, /* Read directory for given inode number */ | ||
64 | NETFS_READ_PAGE, /* Read data page from the server */ | ||
65 | NETFS_WRITE_PAGE, /* Write data page to the server */ | ||
66 | NETFS_CREATE, /* Create directory entry */ | ||
67 | NETFS_REMOVE, /* Remove directory entry */ | ||
68 | |||
69 | NETFS_LOOKUP, /* Lookup single object */ | ||
70 | NETFS_LINK, /* Create a link */ | ||
71 | NETFS_TRANS, /* Transaction */ | ||
72 | NETFS_OPEN, /* Open intent */ | ||
73 | NETFS_INODE_INFO, /* Metadata cache coherency synchronization message */ | ||
74 | |||
75 | NETFS_PAGE_CACHE, /* Page cache invalidation message */ | ||
76 | NETFS_READ_PAGES, /* Read multiple contiguous pages in one go */ | ||
77 | NETFS_RENAME, /* Rename object */ | ||
78 | NETFS_CAPABILITIES, /* Capabilities of the client, for example supported crypto */ | ||
79 | NETFS_LOCK, /* Distributed lock message */ | ||
80 | |||
81 | NETFS_XATTR_SET, /* Set extended attribute */ | ||
82 | NETFS_XATTR_GET, /* Get extended attribute */ | ||
83 | NETFS_CMD_MAX | ||
84 | }; | ||
85 | |||
86 | enum { | ||
87 | POHMELFS_FLAGS_ADD = 0, /* Network state control message for ADD */ | ||
88 | POHMELFS_FLAGS_DEL, /* Network state control message for DEL */ | ||
89 | POHMELFS_FLAGS_SHOW, /* Network state control message for SHOW */ | ||
90 | POHMELFS_FLAGS_CRYPTO, /* Crypto data control message */ | ||
91 | POHMELFS_FLAGS_MODIFY, /* Network state modification message */ | ||
92 | POHMELFS_FLAGS_DUMP, /* Network state control message for SHOW ALL */ | ||
93 | POHMELFS_FLAGS_FLUSH, /* Network state control message for FLUSH */ | ||
94 | }; | ||
95 | |||
96 | /* | ||
97 | * Always wanted to copy it from socket headers into public one, | ||
98 | * since they are __KERNEL__ protected there. | ||
99 | */ | ||
100 | #define _K_SS_MAXSIZE 128 | ||
101 | |||
102 | struct saddr { | ||
103 | unsigned short sa_family; | ||
104 | char addr[_K_SS_MAXSIZE]; | ||
105 | }; | ||
106 | |||
107 | enum { | ||
108 | POHMELFS_CRYPTO_HASH = 0, | ||
109 | POHMELFS_CRYPTO_CIPHER, | ||
110 | }; | ||
111 | |||
112 | struct pohmelfs_crypto { | ||
113 | unsigned int idx; /* Config index */ | ||
114 | unsigned short strlen; /* Size of the attached crypto string including 0-byte | ||
115 | * "cbc(aes)" for example */ | ||
116 | unsigned short type; /* HMAC, cipher, both */ | ||
117 | unsigned int keysize; /* Key size */ | ||
118 | unsigned char data[0]; /* Algorithm string, key and IV */ | ||
119 | }; | ||
120 | |||
121 | #define POHMELFS_IO_PERM_READ (1<<0) | ||
122 | #define POHMELFS_IO_PERM_WRITE (1<<1) | ||
123 | |||
124 | /* | ||
125 | * Configuration command used to create table of different remote servers. | ||
126 | */ | ||
127 | struct pohmelfs_ctl { | ||
128 | __u32 idx; /* Config index */ | ||
129 | __u32 type; /* Socket type */ | ||
130 | __u32 proto; /* Socket protocol */ | ||
131 | __u16 addrlen; /* Size of the address */ | ||
132 | __u16 perm; /* IO permission */ | ||
133 | __u16 prio; /* IO priority */ | ||
134 | struct saddr addr; /* Remote server address */ | ||
135 | }; | ||
136 | |||
137 | /* | ||
138 | * Ack for userspace about requested command. | ||
139 | */ | ||
140 | struct pohmelfs_cn_ack { | ||
141 | struct cn_msg msg; | ||
142 | int error; | ||
143 | int msg_num; | ||
144 | int unused[3]; | ||
145 | struct pohmelfs_ctl ctl; | ||
146 | }; | ||
147 | |||
148 | /* | ||
149 | * Inode info structure used to sync with server. | ||
150 | * Check what stat() returns. | ||
151 | */ | ||
152 | struct netfs_inode_info { | ||
153 | unsigned int mode; | ||
154 | unsigned int nlink; | ||
155 | unsigned int uid; | ||
156 | unsigned int gid; | ||
157 | unsigned int blocksize; | ||
158 | unsigned int padding; | ||
159 | __u64 ino; | ||
160 | __u64 blocks; | ||
161 | __u64 rdev; | ||
162 | __u64 size; | ||
163 | __u64 version; | ||
164 | }; | ||
165 | |||
166 | static inline void netfs_convert_inode_info(struct netfs_inode_info *info) | ||
167 | { | ||
168 | info->mode = __cpu_to_be32(info->mode); | ||
169 | info->nlink = __cpu_to_be32(info->nlink); | ||
170 | info->uid = __cpu_to_be32(info->uid); | ||
171 | info->gid = __cpu_to_be32(info->gid); | ||
172 | info->blocksize = __cpu_to_be32(info->blocksize); | ||
173 | info->blocks = __cpu_to_be64(info->blocks); | ||
174 | info->rdev = __cpu_to_be64(info->rdev); | ||
175 | info->size = __cpu_to_be64(info->size); | ||
176 | info->version = __cpu_to_be64(info->version); | ||
177 | info->ino = __cpu_to_be64(info->ino); | ||
178 | } | ||
179 | |||
180 | /* | ||
181 | * Cache state machine. | ||
182 | */ | ||
183 | enum { | ||
184 | NETFS_COMMAND_PENDING = 0, /* Command is being executed */ | ||
185 | NETFS_INODE_REMOTE_SYNCED, /* Inode was synced to server */ | ||
186 | NETFS_INODE_REMOTE_DIR_SYNCED, /* Inode (directory) was synced from the server */ | ||
187 | NETFS_INODE_OWNED, /* Inode is owned by given host */ | ||
188 | NETFS_INODE_NEED_FLUSH, /* Inode has to be flushed to the server */ | ||
189 | }; | ||
190 | |||
191 | /* | ||
192 | * POHMELFS capabilities: information about supported | ||
193 | * crypto operations (hash/cipher, modes, key sizes and so on), | ||
194 | * root information (used/available size, number of objects, permissions) | ||
195 | */ | ||
196 | enum pohmelfs_capabilities { | ||
197 | POHMELFS_CRYPTO_CAPABILITIES = 0, | ||
198 | POHMELFS_ROOT_CAPABILITIES, | ||
199 | }; | ||
200 | |||
201 | /* Read-only mount */ | ||
202 | #define POHMELFS_FLAGS_RO (1<<0) | ||
203 | /* Extended attributes support on/off */ | ||
204 | #define POHMELFS_FLAGS_XATTR (1<<1) | ||
205 | |||
206 | struct netfs_root_capabilities { | ||
207 | __u64 nr_files; | ||
208 | __u64 used, avail; | ||
209 | __u64 flags; | ||
210 | }; | ||
211 | |||
212 | static inline void netfs_convert_root_capabilities(struct netfs_root_capabilities *cap) | ||
213 | { | ||
214 | cap->nr_files = __cpu_to_be64(cap->nr_files); | ||
215 | cap->used = __cpu_to_be64(cap->used); | ||
216 | cap->avail = __cpu_to_be64(cap->avail); | ||
217 | cap->flags = __cpu_to_be64(cap->flags); | ||
218 | } | ||
219 | |||
220 | struct netfs_crypto_capabilities { | ||
221 | unsigned short hash_strlen; /* Hash string length, like "hmac(sha1) including 0 byte "*/ | ||
222 | unsigned short cipher_strlen; /* Cipher string length with the same format */ | ||
223 | unsigned int cipher_keysize; /* Cipher key size */ | ||
224 | }; | ||
225 | |||
226 | static inline void netfs_convert_crypto_capabilities(struct netfs_crypto_capabilities *cap) | ||
227 | { | ||
228 | cap->hash_strlen = __cpu_to_be16(cap->hash_strlen); | ||
229 | cap->cipher_strlen = __cpu_to_be16(cap->cipher_strlen); | ||
230 | cap->cipher_keysize = __cpu_to_be32(cap->cipher_keysize); | ||
231 | } | ||
232 | |||
233 | enum pohmelfs_lock_type { | ||
234 | POHMELFS_LOCK_GRAB = (1<<15), | ||
235 | |||
236 | POHMELFS_READ_LOCK = 0, | ||
237 | POHMELFS_WRITE_LOCK, | ||
238 | }; | ||
239 | |||
240 | struct netfs_lock { | ||
241 | __u64 start; | ||
242 | __u64 ino; | ||
243 | __u32 size; | ||
244 | __u32 type; | ||
245 | }; | ||
246 | |||
247 | static inline void netfs_convert_lock(struct netfs_lock *lock) | ||
248 | { | ||
249 | lock->start = __cpu_to_be64(lock->start); | ||
250 | lock->ino = __cpu_to_be64(lock->ino); | ||
251 | lock->size = __cpu_to_be32(lock->size); | ||
252 | lock->type = __cpu_to_be32(lock->type); | ||
253 | } | ||
254 | |||
255 | #ifdef __KERNEL__ | ||
256 | |||
257 | #include <linux/kernel.h> | ||
258 | #include <linux/completion.h> | ||
259 | #include <linux/rbtree.h> | ||
260 | #include <linux/net.h> | ||
261 | #include <linux/poll.h> | ||
262 | |||
263 | /* | ||
264 | * Private POHMELFS cache of objects in directory. | ||
265 | */ | ||
266 | struct pohmelfs_name { | ||
267 | struct rb_node hash_node; | ||
268 | |||
269 | struct list_head sync_create_entry; | ||
270 | |||
271 | u64 ino; | ||
272 | |||
273 | u32 hash; | ||
274 | u32 mode; | ||
275 | u32 len; | ||
276 | |||
277 | char *data; | ||
278 | }; | ||
279 | |||
280 | /* | ||
281 | * POHMELFS inode. Main object. | ||
282 | */ | ||
283 | struct pohmelfs_inode { | ||
284 | struct list_head inode_entry; /* Entry in superblock list. | ||
285 | * Objects which are not bound to dentry require to be dropped | ||
286 | * in ->put_super() | ||
287 | */ | ||
288 | struct rb_root hash_root; /* The same, but indexed by name hash and len */ | ||
289 | struct mutex offset_lock; /* Protect both above trees */ | ||
290 | |||
291 | struct list_head sync_create_list; /* List of created but not yet synced to the server children */ | ||
292 | |||
293 | unsigned int drop_count; | ||
294 | |||
295 | int lock_type; /* How this inode is locked: read or write */ | ||
296 | |||
297 | int error; /* Transaction error for given inode */ | ||
298 | |||
299 | long state; /* State machine above */ | ||
300 | |||
301 | u64 ino; /* Inode number */ | ||
302 | u64 total_len; /* Total length of all children names, used to create offsets */ | ||
303 | |||
304 | struct inode vfs_inode; | ||
305 | }; | ||
306 | |||
307 | struct netfs_trans; | ||
308 | typedef int (*netfs_trans_complete_t)(struct page **pages, unsigned int page_num, | ||
309 | void *private, int err); | ||
310 | |||
311 | struct netfs_state; | ||
312 | struct pohmelfs_sb; | ||
313 | |||
314 | struct netfs_trans { | ||
315 | /* | ||
316 | * Transaction header and attached contiguous data live here. | ||
317 | */ | ||
318 | struct iovec iovec; | ||
319 | |||
320 | /* | ||
321 | * Pages attached to transaction. | ||
322 | */ | ||
323 | struct page **pages; | ||
324 | |||
325 | /* | ||
326 | * List and protecting lock for transaction destination | ||
327 | * network states. | ||
328 | */ | ||
329 | spinlock_t dst_lock; | ||
330 | struct list_head dst_list; | ||
331 | |||
332 | /* | ||
333 | * Number of users for given transaction. | ||
334 | * For example each network state attached to transaction | ||
335 | * via dst_list increases it. | ||
336 | */ | ||
337 | atomic_t refcnt; | ||
338 | |||
339 | /* | ||
340 | * Number of pages attached to given transaction. | ||
341 | * Some slots in above page array can be NULL, since | ||
342 | * for example page can be under writeback already, | ||
343 | * so we skip it in this transaction. | ||
344 | */ | ||
345 | unsigned int page_num; | ||
346 | |||
347 | /* | ||
348 | * Transaction flags: single dst or broadcast and so on. | ||
349 | */ | ||
350 | unsigned int flags; | ||
351 | |||
352 | /* | ||
353 | * Size of the data, which can be placed into | ||
354 | * iovec.iov_base area. | ||
355 | */ | ||
356 | unsigned int total_size; | ||
357 | |||
358 | /* | ||
359 | * Number of pages to be sent to remote server. | ||
360 | * Usually equal to above page_num, but in case of partial | ||
361 | * writeback it can accumulate only pages already completed | ||
362 | * previous writeback. | ||
363 | */ | ||
364 | unsigned int attached_pages; | ||
365 | |||
366 | /* | ||
367 | * Attached number of bytes in all above pages. | ||
368 | */ | ||
369 | unsigned int attached_size; | ||
370 | |||
371 | /* | ||
372 | * Unique transacton generation number. | ||
373 | * Used as identity in the network state tree of transactions. | ||
374 | */ | ||
375 | unsigned int gen; | ||
376 | |||
377 | /* | ||
378 | * Transaction completion status. | ||
379 | */ | ||
380 | int result; | ||
381 | |||
382 | /* | ||
383 | * Superblock this transaction belongs to | ||
384 | */ | ||
385 | struct pohmelfs_sb *psb; | ||
386 | |||
387 | /* | ||
388 | * Crypto engine, which processed this transaction. | ||
389 | * Can be not NULL only if crypto engine holds encrypted pages. | ||
390 | */ | ||
391 | struct pohmelfs_crypto_engine *eng; | ||
392 | |||
393 | /* Private data */ | ||
394 | void *private; | ||
395 | |||
396 | /* Completion callback, invoked just before transaction is destroyed */ | ||
397 | netfs_trans_complete_t complete; | ||
398 | }; | ||
399 | |||
400 | static inline int netfs_trans_cur_len(struct netfs_trans *t) | ||
401 | { | ||
402 | return (signed)(t->total_size - t->iovec.iov_len); | ||
403 | } | ||
404 | |||
405 | static inline void *netfs_trans_current(struct netfs_trans *t) | ||
406 | { | ||
407 | return t->iovec.iov_base + t->iovec.iov_len; | ||
408 | } | ||
409 | |||
410 | struct netfs_trans *netfs_trans_alloc(struct pohmelfs_sb *psb, unsigned int size, | ||
411 | unsigned int flags, unsigned int nr); | ||
412 | void netfs_trans_free(struct netfs_trans *t); | ||
413 | int netfs_trans_finish(struct netfs_trans *t, struct pohmelfs_sb *psb); | ||
414 | int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb); | ||
415 | |||
416 | static inline void netfs_trans_reset(struct netfs_trans *t) | ||
417 | { | ||
418 | t->complete = NULL; | ||
419 | } | ||
420 | |||
421 | struct netfs_trans_dst { | ||
422 | struct list_head trans_entry; | ||
423 | struct rb_node state_entry; | ||
424 | |||
425 | unsigned long send_time; | ||
426 | |||
427 | /* | ||
428 | * Times this transaction was resent to its old or new, | ||
429 | * depending on flags, destinations. When it reaches maximum | ||
430 | * allowed number, specified in superblock->trans_retries, | ||
431 | * transaction will be freed with ETIMEDOUT error. | ||
432 | */ | ||
433 | unsigned int retries; | ||
434 | |||
435 | struct netfs_trans *trans; | ||
436 | struct netfs_state *state; | ||
437 | }; | ||
438 | |||
439 | struct netfs_trans_dst *netfs_trans_search(struct netfs_state *st, unsigned int gen); | ||
440 | void netfs_trans_drop_dst(struct netfs_trans_dst *dst); | ||
441 | void netfs_trans_drop_dst_nostate(struct netfs_trans_dst *dst); | ||
442 | void netfs_trans_drop_trans(struct netfs_trans *t, struct netfs_state *st); | ||
443 | void netfs_trans_drop_last(struct netfs_trans *t, struct netfs_state *st); | ||
444 | int netfs_trans_resend(struct netfs_trans *t, struct pohmelfs_sb *psb); | ||
445 | int netfs_trans_remove_nolock(struct netfs_trans_dst *dst, struct netfs_state *st); | ||
446 | |||
447 | int netfs_trans_init(void); | ||
448 | void netfs_trans_exit(void); | ||
449 | |||
450 | struct pohmelfs_crypto_engine { | ||
451 | u64 iv; /* Crypto IV for current operation */ | ||
452 | unsigned long timeout; /* Crypto waiting timeout */ | ||
453 | unsigned int size; /* Size of crypto scratchpad */ | ||
454 | void *data; /* Temporal crypto scratchpad */ | ||
455 | /* | ||
456 | * Crypto operations performed on objects. | ||
457 | */ | ||
458 | struct crypto_hash *hash; | ||
459 | struct crypto_ablkcipher *cipher; | ||
460 | |||
461 | struct pohmelfs_crypto_thread *thread; /* Crypto thread which hosts this engine */ | ||
462 | |||
463 | struct page **pages; | ||
464 | unsigned int page_num; | ||
465 | }; | ||
466 | |||
467 | struct pohmelfs_crypto_thread { | ||
468 | struct list_head thread_entry; | ||
469 | |||
470 | struct task_struct *thread; | ||
471 | struct pohmelfs_sb *psb; | ||
472 | |||
473 | struct pohmelfs_crypto_engine eng; | ||
474 | |||
475 | struct netfs_trans *trans; | ||
476 | |||
477 | wait_queue_head_t wait; | ||
478 | int error; | ||
479 | |||
480 | unsigned int size; | ||
481 | struct page *page; | ||
482 | }; | ||
483 | |||
484 | void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th); | ||
485 | |||
486 | /* | ||
487 | * Network state, attached to one server. | ||
488 | */ | ||
489 | struct netfs_state { | ||
490 | struct mutex __state_lock; /* Can not allow to use the same socket simultaneously */ | ||
491 | struct mutex __state_send_lock; | ||
492 | struct netfs_cmd cmd; /* Cached command */ | ||
493 | struct netfs_inode_info info; /* Cached inode info */ | ||
494 | |||
495 | void *data; /* Cached some data */ | ||
496 | unsigned int size; /* Size of that data */ | ||
497 | |||
498 | struct pohmelfs_sb *psb; /* Superblock */ | ||
499 | |||
500 | struct task_struct *thread; /* Async receiving thread */ | ||
501 | |||
502 | /* Waiting/polling machinery */ | ||
503 | wait_queue_t wait; | ||
504 | wait_queue_head_t *whead; | ||
505 | wait_queue_head_t thread_wait; | ||
506 | |||
507 | struct mutex trans_lock; | ||
508 | struct rb_root trans_root; | ||
509 | |||
510 | struct pohmelfs_ctl ctl; /* Remote peer */ | ||
511 | |||
512 | struct socket *socket; /* Socket object */ | ||
513 | struct socket *read_socket; /* Cached pointer to socket object. | ||
514 | * Used to determine if between lock drops socket was changed. | ||
515 | * Never used to read data or any kind of access. | ||
516 | */ | ||
517 | /* | ||
518 | * Crypto engines to process incoming data. | ||
519 | */ | ||
520 | struct pohmelfs_crypto_engine eng; | ||
521 | |||
522 | int need_reset; | ||
523 | }; | ||
524 | |||
525 | int netfs_state_init(struct netfs_state *st); | ||
526 | void netfs_state_exit(struct netfs_state *st); | ||
527 | |||
528 | static inline void netfs_state_lock_send(struct netfs_state *st) | ||
529 | { | ||
530 | mutex_lock(&st->__state_send_lock); | ||
531 | } | ||
532 | |||
533 | static inline int netfs_state_trylock_send(struct netfs_state *st) | ||
534 | { | ||
535 | return mutex_trylock(&st->__state_send_lock); | ||
536 | } | ||
537 | |||
538 | static inline void netfs_state_unlock_send(struct netfs_state *st) | ||
539 | { | ||
540 | BUG_ON(!mutex_is_locked(&st->__state_send_lock)); | ||
541 | |||
542 | mutex_unlock(&st->__state_send_lock); | ||
543 | } | ||
544 | |||
545 | static inline void netfs_state_lock(struct netfs_state *st) | ||
546 | { | ||
547 | mutex_lock(&st->__state_lock); | ||
548 | } | ||
549 | |||
550 | static inline void netfs_state_unlock(struct netfs_state *st) | ||
551 | { | ||
552 | BUG_ON(!mutex_is_locked(&st->__state_lock)); | ||
553 | |||
554 | mutex_unlock(&st->__state_lock); | ||
555 | } | ||
556 | |||
557 | static inline unsigned int netfs_state_poll(struct netfs_state *st) | ||
558 | { | ||
559 | unsigned int revents = POLLHUP | POLLERR; | ||
560 | |||
561 | netfs_state_lock(st); | ||
562 | if (st->socket) | ||
563 | revents = st->socket->ops->poll(NULL, st->socket, NULL); | ||
564 | netfs_state_unlock(st); | ||
565 | |||
566 | return revents; | ||
567 | } | ||
568 | |||
569 | struct pohmelfs_config; | ||
570 | |||
571 | struct pohmelfs_sb { | ||
572 | struct rb_root mcache_root; | ||
573 | struct mutex mcache_lock; | ||
574 | atomic_long_t mcache_gen; | ||
575 | unsigned long mcache_timeout; | ||
576 | |||
577 | unsigned int idx; | ||
578 | |||
579 | unsigned int trans_retries; | ||
580 | |||
581 | atomic_t trans_gen; | ||
582 | |||
583 | unsigned int crypto_attached_size; | ||
584 | unsigned int crypto_align_size; | ||
585 | |||
586 | unsigned int crypto_fail_unsupported; | ||
587 | |||
588 | unsigned int crypto_thread_num; | ||
589 | struct list_head crypto_active_list, crypto_ready_list; | ||
590 | struct mutex crypto_thread_lock; | ||
591 | |||
592 | unsigned int trans_max_pages; | ||
593 | unsigned long trans_data_size; | ||
594 | unsigned long trans_timeout; | ||
595 | |||
596 | unsigned long drop_scan_timeout; | ||
597 | unsigned long trans_scan_timeout; | ||
598 | |||
599 | unsigned long wait_on_page_timeout; | ||
600 | |||
601 | struct list_head flush_list; | ||
602 | struct list_head drop_list; | ||
603 | spinlock_t ino_lock; | ||
604 | u64 ino; | ||
605 | |||
606 | /* | ||
607 | * Remote nodes POHMELFS connected to. | ||
608 | */ | ||
609 | struct list_head state_list; | ||
610 | struct mutex state_lock; | ||
611 | |||
612 | /* | ||
613 | * Currently active state to request data from. | ||
614 | */ | ||
615 | struct pohmelfs_config *active_state; | ||
616 | |||
617 | |||
618 | wait_queue_head_t wait; | ||
619 | |||
620 | /* | ||
621 | * Timed checks: stale transactions, inodes to be freed and so on. | ||
622 | */ | ||
623 | struct delayed_work dwork; | ||
624 | struct delayed_work drop_dwork; | ||
625 | |||
626 | struct super_block *sb; | ||
627 | |||
628 | struct backing_dev_info bdi; | ||
629 | |||
630 | /* | ||
631 | * Algorithm strings. | ||
632 | */ | ||
633 | char *hash_string; | ||
634 | char *cipher_string; | ||
635 | |||
636 | u8 *hash_key; | ||
637 | u8 *cipher_key; | ||
638 | |||
639 | /* | ||
640 | * Algorithm string lengths. | ||
641 | */ | ||
642 | unsigned int hash_strlen; | ||
643 | unsigned int cipher_strlen; | ||
644 | unsigned int hash_keysize; | ||
645 | unsigned int cipher_keysize; | ||
646 | |||
647 | /* | ||
648 | * Controls whether to perfrom crypto processing or not. | ||
649 | */ | ||
650 | int perform_crypto; | ||
651 | |||
652 | /* | ||
653 | * POHMELFS statistics. | ||
654 | */ | ||
655 | u64 total_size; | ||
656 | u64 avail_size; | ||
657 | atomic_long_t total_inodes; | ||
658 | |||
659 | /* | ||
660 | * Xattr support, read-only and so on. | ||
661 | */ | ||
662 | u64 state_flags; | ||
663 | |||
664 | /* | ||
665 | * Temporary storage to detect changes in the wait queue. | ||
666 | */ | ||
667 | long flags; | ||
668 | }; | ||
669 | |||
670 | static inline void netfs_trans_update(struct netfs_cmd *cmd, | ||
671 | struct netfs_trans *t, unsigned int size) | ||
672 | { | ||
673 | unsigned int sz = ALIGN(size, t->psb->crypto_align_size); | ||
674 | |||
675 | t->iovec.iov_len += sizeof(struct netfs_cmd) + sz; | ||
676 | cmd->cpad = __cpu_to_be16(sz - size); | ||
677 | } | ||
678 | |||
679 | static inline struct pohmelfs_sb *POHMELFS_SB(struct super_block *sb) | ||
680 | { | ||
681 | return sb->s_fs_info; | ||
682 | } | ||
683 | |||
684 | static inline struct pohmelfs_inode *POHMELFS_I(struct inode *inode) | ||
685 | { | ||
686 | return container_of(inode, struct pohmelfs_inode, vfs_inode); | ||
687 | } | ||
688 | |||
689 | static inline u64 pohmelfs_new_ino(struct pohmelfs_sb *psb) | ||
690 | { | ||
691 | u64 ino; | ||
692 | |||
693 | spin_lock(&psb->ino_lock); | ||
694 | ino = psb->ino++; | ||
695 | spin_unlock(&psb->ino_lock); | ||
696 | |||
697 | return ino; | ||
698 | } | ||
699 | |||
700 | static inline void pohmelfs_put_inode(struct pohmelfs_inode *pi) | ||
701 | { | ||
702 | struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); | ||
703 | |||
704 | spin_lock(&psb->ino_lock); | ||
705 | list_move_tail(&pi->inode_entry, &psb->drop_list); | ||
706 | pi->drop_count++; | ||
707 | spin_unlock(&psb->ino_lock); | ||
708 | } | ||
709 | |||
710 | struct pohmelfs_config { | ||
711 | struct list_head config_entry; | ||
712 | |||
713 | struct netfs_state state; | ||
714 | }; | ||
715 | |||
716 | struct pohmelfs_config_group { | ||
717 | /* | ||
718 | * Entry in the global config group list. | ||
719 | */ | ||
720 | struct list_head group_entry; | ||
721 | |||
722 | /* | ||
723 | * Index of the current group. | ||
724 | */ | ||
725 | unsigned int idx; | ||
726 | /* | ||
727 | * Number of config_list entries in this group entry. | ||
728 | */ | ||
729 | unsigned int num_entry; | ||
730 | /* | ||
731 | * Algorithm strings. | ||
732 | */ | ||
733 | char *hash_string; | ||
734 | char *cipher_string; | ||
735 | |||
736 | /* | ||
737 | * Algorithm string lengths. | ||
738 | */ | ||
739 | unsigned int hash_strlen; | ||
740 | unsigned int cipher_strlen; | ||
741 | |||
742 | /* | ||
743 | * Key and its size. | ||
744 | */ | ||
745 | unsigned int hash_keysize; | ||
746 | unsigned int cipher_keysize; | ||
747 | u8 *hash_key; | ||
748 | u8 *cipher_key; | ||
749 | |||
750 | /* | ||
751 | * List of config entries (network state info) for given idx. | ||
752 | */ | ||
753 | struct list_head config_list; | ||
754 | }; | ||
755 | |||
756 | int __init pohmelfs_config_init(void); | ||
757 | void pohmelfs_config_exit(void); | ||
758 | int pohmelfs_copy_config(struct pohmelfs_sb *psb); | ||
759 | int pohmelfs_copy_crypto(struct pohmelfs_sb *psb); | ||
760 | int pohmelfs_config_check(struct pohmelfs_config *config, int idx); | ||
761 | int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf); | ||
762 | |||
763 | extern const struct file_operations pohmelfs_dir_fops; | ||
764 | extern const struct inode_operations pohmelfs_dir_inode_ops; | ||
765 | |||
766 | int pohmelfs_state_init(struct pohmelfs_sb *psb); | ||
767 | void pohmelfs_state_exit(struct pohmelfs_sb *psb); | ||
768 | void pohmelfs_state_flush_transactions(struct netfs_state *st); | ||
769 | |||
770 | void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info); | ||
771 | |||
772 | void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *n); | ||
773 | void pohmelfs_free_names(struct pohmelfs_inode *parent); | ||
774 | struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash); | ||
775 | |||
776 | void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi); | ||
777 | |||
778 | struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb, | ||
779 | struct pohmelfs_inode *parent, struct qstr *str, u64 start, umode_t mode); | ||
780 | |||
781 | int pohmelfs_write_create_inode(struct pohmelfs_inode *pi); | ||
782 | |||
783 | int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans); | ||
784 | int pohmelfs_remove_child(struct pohmelfs_inode *parent, struct pohmelfs_name *n); | ||
785 | |||
786 | struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb, | ||
787 | struct pohmelfs_inode *parent, struct qstr *str, | ||
788 | struct netfs_inode_info *info, int link); | ||
789 | |||
790 | int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr); | ||
791 | int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr); | ||
792 | |||
793 | int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags, | ||
794 | netfs_trans_complete_t complete, void *priv, u64 start); | ||
795 | int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon, | ||
796 | unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start); | ||
797 | |||
798 | void pohmelfs_check_states(struct pohmelfs_sb *psb); | ||
799 | void pohmelfs_switch_active(struct pohmelfs_sb *psb); | ||
800 | |||
801 | int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len); | ||
802 | int pohmelfs_path_length(struct pohmelfs_inode *pi); | ||
803 | |||
804 | struct pohmelfs_crypto_completion { | ||
805 | struct completion complete; | ||
806 | int error; | ||
807 | }; | ||
808 | |||
809 | int pohmelfs_trans_crypt(struct netfs_trans *t, struct pohmelfs_sb *psb); | ||
810 | void pohmelfs_crypto_exit(struct pohmelfs_sb *psb); | ||
811 | int pohmelfs_crypto_init(struct pohmelfs_sb *psb); | ||
812 | |||
813 | int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb); | ||
814 | void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e); | ||
815 | |||
816 | int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 iv, | ||
817 | void *data, struct page *page, unsigned int size); | ||
818 | int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e, | ||
819 | struct page *page, unsigned int size, u64 iv); | ||
820 | |||
821 | static inline u64 pohmelfs_gen_iv(struct netfs_trans *t) | ||
822 | { | ||
823 | u64 iv = t->gen; | ||
824 | |||
825 | iv <<= 32; | ||
826 | iv |= ((unsigned long)t) & 0xffffffff; | ||
827 | |||
828 | return iv; | ||
829 | } | ||
830 | |||
831 | int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type); | ||
832 | int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type); | ||
833 | int pohmelfs_data_lock_response(struct netfs_state *st); | ||
834 | |||
835 | static inline int pohmelfs_need_lock(struct pohmelfs_inode *pi, int type) | ||
836 | { | ||
837 | if (test_bit(NETFS_INODE_OWNED, &pi->state)) { | ||
838 | if (type == pi->lock_type) | ||
839 | return 0; | ||
840 | if ((type == POHMELFS_READ_LOCK) && (pi->lock_type == POHMELFS_WRITE_LOCK)) | ||
841 | return 0; | ||
842 | } | ||
843 | |||
844 | if (!test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)) | ||
845 | return 0; | ||
846 | |||
847 | return 1; | ||
848 | } | ||
849 | |||
850 | int __init pohmelfs_mcache_init(void); | ||
851 | void pohmelfs_mcache_exit(void); | ||
852 | |||
853 | /* #define CONFIG_POHMELFS_DEBUG */ | ||
854 | |||
855 | #ifdef CONFIG_POHMELFS_DEBUG | ||
856 | #define dprintka(f, a...) printk(f, ##a) | ||
857 | #define dprintk(f, a...) printk("%d: " f, task_pid_vnr(current), ##a) | ||
858 | #else | ||
859 | #define dprintka(f, a...) do {} while (0) | ||
860 | #define dprintk(f, a...) do {} while (0) | ||
861 | #endif | ||
862 | |||
863 | static inline void netfs_trans_get(struct netfs_trans *t) | ||
864 | { | ||
865 | atomic_inc(&t->refcnt); | ||
866 | } | ||
867 | |||
868 | static inline void netfs_trans_put(struct netfs_trans *t) | ||
869 | { | ||
870 | if (atomic_dec_and_test(&t->refcnt)) { | ||
871 | dprintk("%s: t: %p, gen: %u, err: %d.\n", | ||
872 | __func__, t, t->gen, t->result); | ||
873 | if (t->complete) | ||
874 | t->complete(t->pages, t->page_num, | ||
875 | t->private, t->result); | ||
876 | netfs_trans_free(t); | ||
877 | } | ||
878 | } | ||
879 | |||
880 | struct pohmelfs_mcache { | ||
881 | struct rb_node mcache_entry; | ||
882 | struct completion complete; | ||
883 | |||
884 | atomic_t refcnt; | ||
885 | |||
886 | u64 gen; | ||
887 | |||
888 | void *data; | ||
889 | u64 start; | ||
890 | u32 size; | ||
891 | int err; | ||
892 | |||
893 | struct netfs_inode_info info; | ||
894 | }; | ||
895 | |||
896 | struct pohmelfs_mcache *pohmelfs_mcache_alloc(struct pohmelfs_sb *psb, u64 start, | ||
897 | unsigned int size, void *data); | ||
898 | void pohmelfs_mcache_free(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m); | ||
899 | struct pohmelfs_mcache *pohmelfs_mcache_search(struct pohmelfs_sb *psb, u64 gen); | ||
900 | void pohmelfs_mcache_remove_locked(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m); | ||
901 | |||
902 | static inline void pohmelfs_mcache_get(struct pohmelfs_mcache *m) | ||
903 | { | ||
904 | atomic_inc(&m->refcnt); | ||
905 | } | ||
906 | |||
907 | static inline void pohmelfs_mcache_put(struct pohmelfs_sb *psb, | ||
908 | struct pohmelfs_mcache *m) | ||
909 | { | ||
910 | if (atomic_dec_and_test(&m->refcnt)) | ||
911 | pohmelfs_mcache_free(psb, m); | ||
912 | } | ||
913 | |||
914 | /*#define POHMELFS_TRUNCATE_ON_INODE_FLUSH | ||
915 | */ | ||
916 | |||
917 | #endif /* __KERNEL__*/ | ||
918 | |||
919 | #endif /* __NETFS_H */ | ||