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d35eef1b EP |
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> | |
182374a0 | 21 | #include <linux/backing-dev.h> |
d35eef1b EP |
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 | ||
2d7cf8ef | 29 | #define POHMELFS_NULL_IDX 65535 |
d35eef1b EP |
30 | |
31 | /* | |
32 | * Network command structure. | |
33 | * Will be extended. | |
34 | */ | |
385e3f1a | 35 | struct netfs_cmd { |
d35eef1b EP |
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 */ | |
e0ca8739 | 91 | POHMELFS_FLAGS_MODIFY, /* Network state modification message */ |
2d7cf8ef EP |
92 | POHMELFS_FLAGS_DUMP, /* Network state control message for SHOW ALL */ |
93 | POHMELFS_FLAGS_FLUSH, /* Network state control message for FLUSH */ | |
d35eef1b EP |
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 | ||
385e3f1a | 102 | struct saddr { |
d35eef1b EP |
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 | ||
385e3f1a | 112 | struct pohmelfs_crypto { |
d35eef1b EP |
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 | ||
f2739de1 EP |
121 | #define POHMELFS_IO_PERM_READ (1<<0) |
122 | #define POHMELFS_IO_PERM_WRITE (1<<1) | |
123 | ||
d35eef1b EP |
124 | /* |
125 | * Configuration command used to create table of different remote servers. | |
126 | */ | |
385e3f1a | 127 | struct pohmelfs_ctl { |
f2739de1 EP |
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 */ | |
d35eef1b EP |
134 | struct saddr addr; /* Remote server address */ |
135 | }; | |
136 | ||
137 | /* | |
138 | * Ack for userspace about requested command. | |
139 | */ | |
385e3f1a | 140 | struct pohmelfs_cn_ack { |
d35eef1b EP |
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 | */ | |
385e3f1a | 152 | struct netfs_inode_info { |
d35eef1b EP |
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 informaion (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 | ||
385e3f1a | 206 | struct netfs_root_capabilities { |
d35eef1b EP |
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 | ||
385e3f1a | 220 | struct netfs_crypto_capabilities { |
d35eef1b EP |
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 | ||
385e3f1a | 240 | struct netfs_lock { |
d35eef1b EP |
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 | */ | |
385e3f1a | 266 | struct pohmelfs_name { |
d35eef1b EP |
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 | */ | |
385e3f1a | 283 | struct pohmelfs_inode { |
d35eef1b EP |
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; | |
9b835ea8 | 308 | typedef int (*netfs_trans_complete_t)(struct page **pages, unsigned int page_num, |
d35eef1b EP |
309 | void *private, int err); |
310 | ||
311 | struct netfs_state; | |
312 | struct pohmelfs_sb; | |
313 | ||
385e3f1a | 314 | struct netfs_trans { |
d35eef1b EP |
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 | ||
385e3f1a | 421 | struct netfs_trans_dst { |
d35eef1b EP |
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 | ||
385e3f1a | 450 | struct pohmelfs_crypto_engine { |
d35eef1b EP |
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 | ||
385e3f1a | 467 | struct pohmelfs_crypto_thread { |
d35eef1b EP |
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 | */ | |
385e3f1a | 489 | struct netfs_state { |
d35eef1b EP |
490 | struct mutex __state_lock; /* Can not allow to use the same socket simultaneously */ |
491 | struct mutex __state_send_lock; | |
75cc5d9c | 492 | struct netfs_cmd cmd; /* Cached command */ |
d35eef1b EP |
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 */ | |
75cc5d9c RP |
503 | wait_queue_t wait; |
504 | wait_queue_head_t *whead; | |
505 | wait_queue_head_t thread_wait; | |
d35eef1b EP |
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 | ||
385e3f1a | 571 | struct pohmelfs_sb { |
d35eef1b EP |
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 | */ | |
75cc5d9c RP |
623 | struct delayed_work dwork; |
624 | struct delayed_work drop_dwork; | |
d35eef1b EP |
625 | |
626 | struct super_block *sb; | |
627 | ||
182374a0 EP |
628 | struct backing_dev_info bdi; |
629 | ||
d35eef1b EP |
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 | ||
385e3f1a | 710 | struct pohmelfs_config { |
d35eef1b EP |
711 | struct list_head config_entry; |
712 | ||
713 | struct netfs_state state; | |
714 | }; | |
715 | ||
385e3f1a | 716 | struct pohmelfs_config_group { |
d35eef1b EP |
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, int 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 | ||
385e3f1a | 804 | struct pohmelfs_crypto_completion { |
d35eef1b EP |
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 | ||
3bafeab7 | 853 | /* #define CONFIG_POHMELFS_DEBUG */ |
d35eef1b EP |
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 | ||
385e3f1a | 880 | struct pohmelfs_mcache { |
d35eef1b EP |
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 | ||
9b835ea8 RP |
914 | /*#define POHMELFS_TRUNCATE_ON_INODE_FLUSH |
915 | */ | |
2d7cf8ef | 916 | |
d35eef1b EP |
917 | #endif /* __KERNEL__*/ |
918 | ||
919 | #endif /* __NETFS_H */ |