drivers/staging/pohmelfs/netfs.h

   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
  22 #define POHMELFS_CN_IDX                 5
  23 #define POHMELFS_CN_VAL                 0
  24
  25 #define POHMELFS_CTLINFO_ACK            1
  26 #define POHMELFS_NOINFO_ACK             2
  27
  28
  29 /*
  30  * Network command structure.
  31  * Will be extended.
  32  */
  33 struct netfs_cmd
  34 {
  35         __u16                   cmd;    /* Command number */
  36         __u16                   csize;  /* Attached crypto information size */
  37         __u16                   cpad;   /* Attached padding size */
  38         __u16                   ext;    /* External flags */
  39         __u32                   size;   /* Size of the attached data */
  40         __u32                   trans;  /* Transaction id */
  41         __u64                   id;     /* Object ID to operate on. Used for feedback.*/
  42         __u64                   start;  /* Start of the object. */
  43         __u64                   iv;     /* IV sequence */
  44         __u8                    data[0];
  45 };
  46
  47 static inline void netfs_convert_cmd(struct netfs_cmd *cmd)
  48 {
  49         cmd->id = __be64_to_cpu(cmd->id);
  50         cmd->start = __be64_to_cpu(cmd->start);
  51         cmd->iv = __be64_to_cpu(cmd->iv);
  52         cmd->cmd = __be16_to_cpu(cmd->cmd);
  53         cmd->ext = __be16_to_cpu(cmd->ext);
  54         cmd->csize = __be16_to_cpu(cmd->csize);
  55         cmd->cpad = __be16_to_cpu(cmd->cpad);
  56         cmd->size = __be32_to_cpu(cmd->size);
  57 }
  58
  59 #define NETFS_TRANS_SINGLE_DST          (1<<0)
  60
  61 enum {
  62         NETFS_READDIR   = 1,    /* Read directory for given inode number */
  63         NETFS_READ_PAGE,        /* Read data page from the server */
  64         NETFS_WRITE_PAGE,       /* Write data page to the server */
  65         NETFS_CREATE,           /* Create directory entry */
  66         NETFS_REMOVE,           /* Remove directory entry */
  67
  68         NETFS_LOOKUP,           /* Lookup single object */
  69         NETFS_LINK,             /* Create a link */
  70         NETFS_TRANS,            /* Transaction */
  71         NETFS_OPEN,             /* Open intent */
  72         NETFS_INODE_INFO,       /* Metadata cache coherency synchronization message */
  73
  74         NETFS_PAGE_CACHE,       /* Page cache invalidation message */
  75         NETFS_READ_PAGES,       /* Read multiple contiguous pages in one go */
  76         NETFS_RENAME,           /* Rename object */
  77         NETFS_CAPABILITIES,     /* Capabilities of the client, for example supported crypto */
  78         NETFS_LOCK,             /* Distributed lock message */
  79
  80         NETFS_XATTR_SET,        /* Set extended attribute */
  81         NETFS_XATTR_GET,        /* Get extended attribute */
  82         NETFS_CMD_MAX
  83 };
  84
  85 enum {
  86         POHMELFS_FLAGS_ADD = 0, /* Network state control message for ADD */
  87         POHMELFS_FLAGS_DEL,     /* Network state control message for DEL */
  88         POHMELFS_FLAGS_SHOW,    /* Network state control message for SHOW */
  89         POHMELFS_FLAGS_CRYPTO,  /* Crypto data control message */
  90         POHMELFS_FLAGS_MODIFY,  /* Network state modification message */
  91 };
  92
  93 /*
  94  * Always wanted to copy it from socket headers into public one,
  95  * since they are __KERNEL__ protected there.
  96  */
  97 #define _K_SS_MAXSIZE   128
  98
  99 struct saddr
 100 {
 101         unsigned short          sa_family;
 102         char                    addr[_K_SS_MAXSIZE];
 103 };
 104
 105 enum {
 106         POHMELFS_CRYPTO_HASH = 0,
 107         POHMELFS_CRYPTO_CIPHER,
 108 };
 109
 110 struct pohmelfs_crypto
 111 {
 112         unsigned int            idx;            /* Config index */
 113         unsigned short          strlen;         /* Size of the attached crypto string including 0-byte
 114                                                  * "cbc(aes)" for example */
 115         unsigned short          type;           /* HMAC, cipher, both */
 116         unsigned int            keysize;        /* Key size */
 117         unsigned char           data[0];        /* Algorithm string, key and IV */
 118 };
 119
 120 #define POHMELFS_IO_PERM_READ           (1<<0)
 121 #define POHMELFS_IO_PERM_WRITE          (1<<1)
 122
 123 /*
 124  * Configuration command used to create table of different remote servers.
 125  */
 126 struct pohmelfs_ctl
 127 {
 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 {
 142         struct cn_msg           msg;
 143         int                     error;
 144         int                     msg_num;
 145         int                     unused[3];
 146         struct pohmelfs_ctl     ctl;
 147 };
 148
 149 /*
 150  * Inode info structure used to sync with server.
 151  * Check what stat() returns.
 152  */
 153 struct netfs_inode_info
 154 {
 155         unsigned int            mode;
 156         unsigned int            nlink;
 157         unsigned int            uid;
 158         unsigned int            gid;
 159         unsigned int            blocksize;
 160         unsigned int            padding;
 161         __u64                   ino;
 162         __u64                   blocks;
 163         __u64                   rdev;
 164         __u64                   size;
 165         __u64                   version;
 166 };
 167
 168 static inline void netfs_convert_inode_info(struct netfs_inode_info *info)
 169 {
 170         info->mode = __cpu_to_be32(info->mode);
 171         info->nlink = __cpu_to_be32(info->nlink);
 172         info->uid = __cpu_to_be32(info->uid);
 173         info->gid = __cpu_to_be32(info->gid);
 174         info->blocksize = __cpu_to_be32(info->blocksize);
 175         info->blocks = __cpu_to_be64(info->blocks);
 176         info->rdev = __cpu_to_be64(info->rdev);
 177         info->size = __cpu_to_be64(info->size);
 178         info->version = __cpu_to_be64(info->version);
 179         info->ino = __cpu_to_be64(info->ino);
 180 }
 181
 182 /*
 183  * Cache state machine.
 184  */
 185 enum {
 186         NETFS_COMMAND_PENDING = 0,      /* Command is being executed */
 187         NETFS_INODE_REMOTE_SYNCED,      /* Inode was synced to server */
 188         NETFS_INODE_REMOTE_DIR_SYNCED,  /* Inode (directory) was synced from the server */
 189         NETFS_INODE_OWNED,              /* Inode is owned by given host */
 190         NETFS_INODE_NEED_FLUSH,         /* Inode has to be flushed to the server */
 191 };
 192
 193 /*
 194  * POHMELFS capabilities: information about supported
 195  * crypto operations (hash/cipher, modes, key sizes and so on),
 196  * root informaion (used/available size, number of objects, permissions)
 197  */
 198 enum pohmelfs_capabilities {
 199         POHMELFS_CRYPTO_CAPABILITIES = 0,
 200         POHMELFS_ROOT_CAPABILITIES,
 201 };
 202
 203 /* Read-only mount */
 204 #define POHMELFS_FLAGS_RO               (1<<0)
 205 /* Extended attributes support on/off */
 206 #define POHMELFS_FLAGS_XATTR            (1<<1)
 207
 208 struct netfs_root_capabilities
 209 {
 210         __u64                   nr_files;
 211         __u64                   used, avail;
 212         __u64                   flags;
 213 };
 214
 215 static inline void netfs_convert_root_capabilities(struct netfs_root_capabilities *cap)
 216 {
 217         cap->nr_files = __cpu_to_be64(cap->nr_files);
 218         cap->used = __cpu_to_be64(cap->used);
 219         cap->avail = __cpu_to_be64(cap->avail);
 220         cap->flags = __cpu_to_be64(cap->flags);
 221 }
 222
 223 struct netfs_crypto_capabilities
 224 {
 225         unsigned short          hash_strlen;    /* Hash string length, like "hmac(sha1) including 0 byte "*/
 226         unsigned short          cipher_strlen;  /* Cipher string length with the same format */
 227         unsigned int            cipher_keysize; /* Cipher key size */
 228 };
 229
 230 static inline void netfs_convert_crypto_capabilities(struct netfs_crypto_capabilities *cap)
 231 {
 232         cap->hash_strlen = __cpu_to_be16(cap->hash_strlen);
 233         cap->cipher_strlen = __cpu_to_be16(cap->cipher_strlen);
 234         cap->cipher_keysize = __cpu_to_be32(cap->cipher_keysize);
 235 }
 236
 237 enum pohmelfs_lock_type {
 238         POHMELFS_LOCK_GRAB      = (1<<15),
 239
 240         POHMELFS_READ_LOCK      = 0,
 241         POHMELFS_WRITE_LOCK,
 242 };
 243
 244 struct netfs_lock
 245 {
 246         __u64                   start;
 247         __u64                   ino;
 248         __u32                   size;
 249         __u32                   type;
 250 };
 251
 252 static inline void netfs_convert_lock(struct netfs_lock *lock)
 253 {
 254         lock->start = __cpu_to_be64(lock->start);
 255         lock->ino = __cpu_to_be64(lock->ino);
 256         lock->size = __cpu_to_be32(lock->size);
 257         lock->type = __cpu_to_be32(lock->type);
 258 }
 259
 260 #ifdef __KERNEL__
 261
 262 #include <linux/kernel.h>
 263 #include <linux/completion.h>
 264 #include <linux/rbtree.h>
 265 #include <linux/net.h>
 266 #include <linux/poll.h>
 267
 268 /*
 269  * Private POHMELFS cache of objects in directory.
 270  */
 271 struct pohmelfs_name
 272 {
 273         struct rb_node          hash_node;
 274
 275         struct list_head        sync_create_entry;
 276
 277         u64                     ino;
 278
 279         u32                     hash;
 280         u32                     mode;
 281         u32                     len;
 282
 283         char                    *data;
 284 };
 285
 286 /*
 287  * POHMELFS inode. Main object.
 288  */
 289 struct pohmelfs_inode
 290 {
 291         struct list_head        inode_entry;            /* Entry in superblock list.
 292                                                          * Objects which are not bound to dentry require to be dropped
 293                                                          * in ->put_super()
 294                                                          */
 295         struct rb_root          hash_root;              /* The same, but indexed by name hash and len */
 296         struct mutex            offset_lock;            /* Protect both above trees */
 297
 298         struct list_head        sync_create_list;       /* List of created but not yet synced to the server children */
 299
 300         unsigned int            drop_count;
 301
 302         int                     lock_type;              /* How this inode is locked: read or write */
 303
 304         int                     error;                  /* Transaction error for given inode */
 305
 306         long                    state;                  /* State machine above */
 307
 308         u64                     ino;                    /* Inode number */
 309         u64                     total_len;              /* Total length of all children names, used to create offsets */
 310
 311         struct inode            vfs_inode;
 312 };
 313
 314 struct netfs_trans;
 315 typedef int (* netfs_trans_complete_t)(struct page **pages, unsigned int page_num,
 316                 void *private, int err);
 317
 318 struct netfs_state;
 319 struct pohmelfs_sb;
 320
 321 struct netfs_trans
 322 {
 323         /*
 324          * Transaction header and attached contiguous data live here.
 325          */
 326         struct iovec                    iovec;
 327
 328         /*
 329          * Pages attached to transaction.
 330          */
 331         struct page                     **pages;
 332
 333         /*
 334          * List and protecting lock for transaction destination
 335          * network states.
 336          */
 337         spinlock_t                      dst_lock;
 338         struct list_head                dst_list;
 339
 340         /*
 341          * Number of users for given transaction.
 342          * For example each network state attached to transaction
 343          * via dst_list increases it.
 344          */
 345         atomic_t                        refcnt;
 346
 347         /*
 348          * Number of pages attached to given transaction.
 349          * Some slots in above page array can be NULL, since
 350          * for example page can be under writeback already,
 351          * so we skip it in this transaction.
 352          */
 353         unsigned int                    page_num;
 354
 355         /*
 356          * Transaction flags: single dst or broadcast and so on.
 357          */
 358         unsigned int                    flags;
 359
 360         /*
 361          * Size of the data, which can be placed into
 362          * iovec.iov_base area.
 363          */
 364         unsigned int                    total_size;
 365
 366         /*
 367          * Number of pages to be sent to remote server.
 368          * Usually equal to above page_num, but in case of partial
 369          * writeback it can accumulate only pages already completed
 370          * previous writeback.
 371          */
 372         unsigned int                    attached_pages;
 373
 374         /*
 375          * Attached number of bytes in all above pages.
 376          */
 377         unsigned int                    attached_size;
 378
 379         /*
 380          * Unique transacton generation number.
 381          * Used as identity in the network state tree of transactions.
 382          */
 383         unsigned int                    gen;
 384
 385         /*
 386          * Transaction completion status.
 387          */
 388         int                             result;
 389
 390         /*
 391          * Superblock this transaction belongs to
 392          */
 393         struct pohmelfs_sb              *psb;
 394
 395         /*
 396          * Crypto engine, which processed this transaction.
 397          * Can be not NULL only if crypto engine holds encrypted pages.
 398          */
 399         struct pohmelfs_crypto_engine   *eng;
 400
 401         /* Private data */
 402         void                            *private;
 403
 404         /* Completion callback, invoked just before transaction is destroyed */
 405         netfs_trans_complete_t          complete;
 406 };
 407
 408 static inline int netfs_trans_cur_len(struct netfs_trans *t)
 409 {
 410         return (signed)(t->total_size - t->iovec.iov_len);
 411 }
 412
 413 static inline void *netfs_trans_current(struct netfs_trans *t)
 414 {
 415         return t->iovec.iov_base + t->iovec.iov_len;
 416 }
 417
 418 struct netfs_trans *netfs_trans_alloc(struct pohmelfs_sb *psb, unsigned int size,
 419                 unsigned int flags, unsigned int nr);
 420 void netfs_trans_free(struct netfs_trans *t);
 421 int netfs_trans_finish(struct netfs_trans *t, struct pohmelfs_sb *psb);
 422 int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb);
 423
 424 static inline void netfs_trans_reset(struct netfs_trans *t)
 425 {
 426         t->complete = NULL;
 427 }
 428
 429 struct netfs_trans_dst
 430 {
 431         struct list_head                trans_entry;
 432         struct rb_node                  state_entry;
 433
 434         unsigned long                   send_time;
 435
 436         /*
 437          * Times this transaction was resent to its old or new,
 438          * depending on flags, destinations. When it reaches maximum
 439          * allowed number, specified in superblock->trans_retries,
 440          * transaction will be freed with ETIMEDOUT error.
 441          */
 442         unsigned int                    retries;
 443
 444         struct netfs_trans              *trans;
 445         struct netfs_state              *state;
 446 };
 447
 448 struct netfs_trans_dst *netfs_trans_search(struct netfs_state *st, unsigned int gen);
 449 void netfs_trans_drop_dst(struct netfs_trans_dst *dst);
 450 void netfs_trans_drop_dst_nostate(struct netfs_trans_dst *dst);
 451 void netfs_trans_drop_trans(struct netfs_trans *t, struct netfs_state *st);
 452 void netfs_trans_drop_last(struct netfs_trans *t, struct netfs_state *st);
 453 int netfs_trans_resend(struct netfs_trans *t, struct pohmelfs_sb *psb);
 454 int netfs_trans_remove_nolock(struct netfs_trans_dst *dst, struct netfs_state *st);
 455
 456 int netfs_trans_init(void);
 457 void netfs_trans_exit(void);
 458
 459 struct pohmelfs_crypto_engine
 460 {
 461         u64                             iv;             /* Crypto IV for current operation */
 462         unsigned long                   timeout;        /* Crypto waiting timeout */
 463         unsigned int                    size;           /* Size of crypto scratchpad */
 464         void                            *data;          /* Temporal crypto scratchpad */
 465         /*
 466          * Crypto operations performed on objects.
 467          */
 468         struct crypto_hash              *hash;
 469         struct crypto_ablkcipher        *cipher;
 470
 471         struct pohmelfs_crypto_thread   *thread;        /* Crypto thread which hosts this engine */
 472
 473         struct page                     **pages;
 474         unsigned int                    page_num;
 475 };
 476
 477 struct pohmelfs_crypto_thread
 478 {
 479         struct list_head                thread_entry;
 480
 481         struct task_struct              *thread;
 482         struct pohmelfs_sb              *psb;
 483
 484         struct pohmelfs_crypto_engine   eng;
 485
 486         struct netfs_trans              *trans;
 487
 488         wait_queue_head_t               wait;
 489         int                             error;
 490
 491         unsigned int                    size;
 492         struct page                     *page;
 493 };
 494
 495 void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th);
 496
 497 /*
 498  * Network state, attached to one server.
 499  */
 500 struct netfs_state
 501 {
 502         struct mutex            __state_lock;           /* Can not allow to use the same socket simultaneously */
 503         struct mutex            __state_send_lock;
 504         struct netfs_cmd        cmd;                    /* Cached command */
 505         struct netfs_inode_info info;                   /* Cached inode info */
 506
 507         void                    *data;                  /* Cached some data */
 508         unsigned int            size;                   /* Size of that data */
 509
 510         struct pohmelfs_sb      *psb;                   /* Superblock */
 511
 512         struct task_struct      *thread;                /* Async receiving thread */
 513
 514         /* Waiting/polling machinery */
 515         wait_queue_t            wait;
 516         wait_queue_head_t       *whead;
 517         wait_queue_head_t       thread_wait;
 518
 519         struct mutex            trans_lock;
 520         struct rb_root          trans_root;
 521
 522         struct pohmelfs_ctl     ctl;                    /* Remote peer */
 523
 524         struct socket           *socket;                /* Socket object */
 525         struct socket           *read_socket;           /* Cached pointer to socket object.
 526                                                          * Used to determine if between lock drops socket was changed.
 527                                                          * Never used to read data or any kind of access.
 528                                                          */
 529         /*
 530          * Crypto engines to process incoming data.
 531          */
 532         struct pohmelfs_crypto_engine   eng;
 533
 534         int                     need_reset;
 535 };
 536
 537 int netfs_state_init(struct netfs_state *st);
 538 void netfs_state_exit(struct netfs_state *st);
 539
 540 static inline void netfs_state_lock_send(struct netfs_state *st)
 541 {
 542         mutex_lock(&st->__state_send_lock);
 543 }
 544
 545 static inline int netfs_state_trylock_send(struct netfs_state *st)
 546 {
 547         return mutex_trylock(&st->__state_send_lock);
 548 }
 549
 550 static inline void netfs_state_unlock_send(struct netfs_state *st)
 551 {
 552         BUG_ON(!mutex_is_locked(&st->__state_send_lock));
 553
 554         mutex_unlock(&st->__state_send_lock);
 555 }
 556
 557 static inline void netfs_state_lock(struct netfs_state *st)
 558 {
 559         mutex_lock(&st->__state_lock);
 560 }
 561
 562 static inline void netfs_state_unlock(struct netfs_state *st)
 563 {
 564         BUG_ON(!mutex_is_locked(&st->__state_lock));
 565
 566         mutex_unlock(&st->__state_lock);
 567 }
 568
 569 static inline unsigned int netfs_state_poll(struct netfs_state *st)
 570 {
 571         unsigned int revents = POLLHUP | POLLERR;
 572
 573         netfs_state_lock(st);
 574         if (st->socket)
 575                 revents = st->socket->ops->poll(NULL, st->socket, NULL);
 576         netfs_state_unlock(st);
 577
 578         return revents;
 579 }
 580
 581 struct pohmelfs_config;
 582
 583 struct pohmelfs_sb
 584 {
 585         struct rb_root          mcache_root;
 586         struct mutex            mcache_lock;
 587         atomic_long_t           mcache_gen;
 588         unsigned long           mcache_timeout;
 589
 590         unsigned int            idx;
 591
 592         unsigned int            trans_retries;
 593
 594         atomic_t                trans_gen;
 595
 596         unsigned int            crypto_attached_size;
 597         unsigned int            crypto_align_size;
 598
 599         unsigned int            crypto_fail_unsupported;
 600
 601         unsigned int            crypto_thread_num;
 602         struct list_head        crypto_active_list, crypto_ready_list;
 603         struct mutex            crypto_thread_lock;
 604
 605         unsigned int            trans_max_pages;
 606         unsigned long           trans_data_size;
 607         unsigned long           trans_timeout;
 608
 609         unsigned long           drop_scan_timeout;
 610         unsigned long           trans_scan_timeout;
 611
 612         unsigned long           wait_on_page_timeout;
 613
 614         struct list_head        flush_list;
 615         struct list_head        drop_list;
 616         spinlock_t              ino_lock;
 617         u64                     ino;
 618
 619         /*
 620          * Remote nodes POHMELFS connected to.
 621          */
 622         struct list_head        state_list;
 623         struct mutex            state_lock;
 624
 625         /*
 626          * Currently active state to request data from.
 627          */
 628         struct pohmelfs_config  *active_state;
 629
 630
 631         wait_queue_head_t       wait;
 632
 633         /*
 634          * Timed checks: stale transactions, inodes to be freed and so on.
 635          */
 636         struct delayed_work     dwork;
 637         struct delayed_work     drop_dwork;
 638
 639         struct super_block      *sb;
 640
 641         /*
 642          * Algorithm strings.
 643          */
 644         char                    *hash_string;
 645         char                    *cipher_string;
 646
 647         u8                      *hash_key;
 648         u8                      *cipher_key;
 649
 650         /*
 651          * Algorithm string lengths.
 652          */
 653         unsigned int            hash_strlen;
 654         unsigned int            cipher_strlen;
 655         unsigned int            hash_keysize;
 656         unsigned int            cipher_keysize;
 657
 658         /*
 659          * Controls whether to perfrom crypto processing or not.
 660          */
 661         int                     perform_crypto;
 662
 663         /*
 664          * POHMELFS statistics.
 665          */
 666         u64                     total_size;
 667         u64                     avail_size;
 668         atomic_long_t           total_inodes;
 669
 670         /*
 671          * Xattr support, read-only and so on.
 672          */
 673         u64                     state_flags;
 674
 675         /*
 676          * Temporary storage to detect changes in the wait queue.
 677          */
 678         long                    flags;
 679 };
 680
 681 static inline void netfs_trans_update(struct netfs_cmd *cmd,
 682                 struct netfs_trans *t, unsigned int size)
 683 {
 684         unsigned int sz = ALIGN(size, t->psb->crypto_align_size);
 685
 686         t->iovec.iov_len += sizeof(struct netfs_cmd) + sz;
 687         cmd->cpad = __cpu_to_be16(sz - size);
 688 }
 689
 690 static inline struct pohmelfs_sb *POHMELFS_SB(struct super_block *sb)
 691 {
 692         return sb->s_fs_info;
 693 }
 694
 695 static inline struct pohmelfs_inode *POHMELFS_I(struct inode *inode)
 696 {
 697         return container_of(inode, struct pohmelfs_inode, vfs_inode);
 698 }
 699
 700 static inline u64 pohmelfs_new_ino(struct pohmelfs_sb *psb)
 701 {
 702         u64 ino;
 703
 704         spin_lock(&psb->ino_lock);
 705         ino = psb->ino++;
 706         spin_unlock(&psb->ino_lock);
 707
 708         return ino;
 709 }
 710
 711 static inline void pohmelfs_put_inode(struct pohmelfs_inode *pi)
 712 {
 713         struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
 714
 715         spin_lock(&psb->ino_lock);
 716         list_move_tail(&pi->inode_entry, &psb->drop_list);
 717         pi->drop_count++;
 718         spin_unlock(&psb->ino_lock);
 719 }
 720
 721 struct pohmelfs_config
 722 {
 723         struct list_head        config_entry;
 724
 725         struct netfs_state      state;
 726 };
 727
 728 struct pohmelfs_config_group
 729 {
 730         /*
 731          * Entry in the global config group list.
 732          */
 733         struct list_head        group_entry;
 734
 735         /*
 736          * Index of the current group.
 737          */
 738         unsigned int            idx;
 739         /*
 740          * Number of config_list entries in this group entry.
 741          */
 742         unsigned int            num_entry;
 743         /*
 744          * Algorithm strings.
 745          */
 746         char                    *hash_string;
 747         char                    *cipher_string;
 748
 749         /*
 750          * Algorithm string lengths.
 751          */
 752         unsigned int            hash_strlen;
 753         unsigned int            cipher_strlen;
 754
 755         /*
 756          * Key and its size.
 757          */
 758         unsigned int            hash_keysize;
 759         unsigned int            cipher_keysize;
 760         u8                      *hash_key;
 761         u8                      *cipher_key;
 762
 763         /*
 764          * List of config entries (network state info) for given idx.
 765          */
 766         struct list_head        config_list;
 767 };
 768
 769 int __init pohmelfs_config_init(void);
 770 void pohmelfs_config_exit(void);
 771 int pohmelfs_copy_config(struct pohmelfs_sb *psb);
 772 int pohmelfs_copy_crypto(struct pohmelfs_sb *psb);
 773 int pohmelfs_config_check(struct pohmelfs_config *config, int idx);
 774 int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf);
 775
 776 extern const struct file_operations pohmelfs_dir_fops;
 777 extern const struct inode_operations pohmelfs_dir_inode_ops;
 778
 779 int pohmelfs_state_init(struct pohmelfs_sb *psb);
 780 void pohmelfs_state_exit(struct pohmelfs_sb *psb);
 781 void pohmelfs_state_flush_transactions(struct netfs_state *st);
 782
 783 void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info);
 784
 785 void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
 786 void pohmelfs_free_names(struct pohmelfs_inode *parent);
 787 struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash);
 788
 789 void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi);
 790
 791 struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb,
 792         struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode);
 793
 794 int pohmelfs_write_create_inode(struct pohmelfs_inode *pi);
 795
 796 int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans);
 797 int pohmelfs_remove_child(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
 798
 799 struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb,
 800                 struct pohmelfs_inode *parent, struct qstr *str,
 801                 struct netfs_inode_info *info, int link);
 802
 803 int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr);
 804 int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr);
 805
 806 int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags,
 807                 netfs_trans_complete_t complete, void *priv, u64 start);
 808 int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon,
 809                 unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start);
 810
 811 void pohmelfs_check_states(struct pohmelfs_sb *psb);
 812 void pohmelfs_switch_active(struct pohmelfs_sb *psb);
 813
 814 int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len);
 815 int pohmelfs_path_length(struct pohmelfs_inode *pi);
 816
 817 struct pohmelfs_crypto_completion
 818 {
 819         struct completion       complete;
 820         int                     error;
 821 };
 822
 823 int pohmelfs_trans_crypt(struct netfs_trans *t, struct pohmelfs_sb *psb);
 824 void pohmelfs_crypto_exit(struct pohmelfs_sb *psb);
 825 int pohmelfs_crypto_init(struct pohmelfs_sb *psb);
 826
 827 int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb);
 828 void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e);
 829
 830 int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 iv,
 831                 void *data, struct page *page, unsigned int size);
 832 int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e,
 833                 struct page *page, unsigned int size, u64 iv);
 834
 835 static inline u64 pohmelfs_gen_iv(struct netfs_trans *t)
 836 {
 837         u64 iv = t->gen;
 838
 839         iv <<= 32;
 840         iv |= ((unsigned long)t) & 0xffffffff;
 841
 842         return iv;
 843 }
 844
 845 int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
 846 int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
 847 int pohmelfs_data_lock_response(struct netfs_state *st);
 848
 849 static inline int pohmelfs_need_lock(struct pohmelfs_inode *pi, int type)
 850 {
 851         if (test_bit(NETFS_INODE_OWNED, &pi->state)) {
 852                 if (type == pi->lock_type)
 853                         return 0;
 854                 if ((type == POHMELFS_READ_LOCK) && (pi->lock_type == POHMELFS_WRITE_LOCK))
 855                         return 0;
 856         }
 857
 858         if (!test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
 859                 return 0;
 860
 861         return 1;
 862 }
 863
 864 int __init pohmelfs_mcache_init(void);
 865 void pohmelfs_mcache_exit(void);
 866
 867 //#define CONFIG_POHMELFS_DEBUG
 868
 869 #ifdef CONFIG_POHMELFS_DEBUG
 870 #define dprintka(f, a...) printk(f, ##a)
 871 #define dprintk(f, a...) printk("%d: " f, task_pid_vnr(current), ##a)
 872 #else
 873 #define dprintka(f, a...) do {} while (0)
 874 #define dprintk(f, a...) do {} while (0)
 875 #endif
 876
 877 static inline void netfs_trans_get(struct netfs_trans *t)
 878 {
 879         atomic_inc(&t->refcnt);
 880 }
 881
 882 static inline void netfs_trans_put(struct netfs_trans *t)
 883 {
 884         if (atomic_dec_and_test(&t->refcnt)) {
 885                 dprintk("%s: t: %p, gen: %u, err: %d.\n",
 886                         __func__, t, t->gen, t->result);
 887                 if (t->complete)
 888                         t->complete(t->pages, t->page_num,
 889                                 t->private, t->result);
 890                 netfs_trans_free(t);
 891         }
 892 }
 893
 894 struct pohmelfs_mcache
 895 {
 896         struct rb_node                  mcache_entry;
 897         struct completion               complete;
 898
 899         atomic_t                        refcnt;
 900
 901         u64                             gen;
 902
 903         void                            *data;
 904         u64                             start;
 905         u32                             size;
 906         int                             err;
 907
 908         struct netfs_inode_info         info;
 909 };
 910
 911 struct pohmelfs_mcache *pohmelfs_mcache_alloc(struct pohmelfs_sb *psb, u64 start,
 912                 unsigned int size, void *data);
 913 void pohmelfs_mcache_free(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
 914 struct pohmelfs_mcache *pohmelfs_mcache_search(struct pohmelfs_sb *psb, u64 gen);
 915 void pohmelfs_mcache_remove_locked(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
 916
 917 static inline void pohmelfs_mcache_get(struct pohmelfs_mcache *m)
 918 {
 919         atomic_inc(&m->refcnt);
 920 }
 921
 922 static inline void pohmelfs_mcache_put(struct pohmelfs_sb *psb,
 923                 struct pohmelfs_mcache *m)
 924 {
 925         if (atomic_dec_and_test(&m->refcnt))
 926                 pohmelfs_mcache_free(psb, m);
 927 }
 928
 929 #endif /* __KERNEL__*/
 930
 931 #endif /* __NETFS_H */