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 };
  91
  92 /*
  93  * Always wanted to copy it from socket headers into public one,
  94  * since they are __KERNEL__ protected there.
  95  */
  96 #define _K_SS_MAXSIZE   128
  97
  98 struct saddr
  99 {
 100         unsigned short          sa_family;
 101         char                    addr[_K_SS_MAXSIZE];
 102 };
 103
 104 enum {
 105         POHMELFS_CRYPTO_HASH = 0,
 106         POHMELFS_CRYPTO_CIPHER,
 107 };
 108
 109 struct pohmelfs_crypto
 110 {
 111         unsigned int            idx;            /* Config index */
 112         unsigned short          strlen;         /* Size of the attached crypto string including 0-byte
 113                                                  * "cbc(aes)" for example */
 114         unsigned short          type;           /* HMAC, cipher, both */
 115         unsigned int            keysize;        /* Key size */
 116         unsigned char           data[0];        /* Algorithm string, key and IV */
 117 };
 118
 119 /*
 120  * Configuration command used to create table of different remote servers.
 121  */
 122 struct pohmelfs_ctl
 123 {
 124         unsigned int            idx;            /* Config index */
 125         unsigned int            type;           /* Socket type */
 126         unsigned int            proto;          /* Socket protocol */
 127         unsigned int            addrlen;        /* Size of the address */
 128         unsigned short          unused;         /* Align structure by 4 bytes */
 129         struct saddr            addr;           /* Remote server address */
 130 };
 131
 132 /*
 133  * Ack for userspace about requested command.
 134  */
 135 struct pohmelfs_cn_ack
 136 {
 137         struct cn_msg           msg;
 138         int                     error;
 139         int                     msg_num;
 140         int                     unused[3];
 141         struct pohmelfs_ctl     ctl;
 142 };
 143
 144 /*
 145  * Inode info structure used to sync with server.
 146  * Check what stat() returns.
 147  */
 148 struct netfs_inode_info
 149 {
 150         unsigned int            mode;
 151         unsigned int            nlink;
 152         unsigned int            uid;
 153         unsigned int            gid;
 154         unsigned int            blocksize;
 155         unsigned int            padding;
 156         __u64                   ino;
 157         __u64                   blocks;
 158         __u64                   rdev;
 159         __u64                   size;
 160         __u64                   version;
 161 };
 162
 163 static inline void netfs_convert_inode_info(struct netfs_inode_info *info)
 164 {
 165         info->mode = __cpu_to_be32(info->mode);
 166         info->nlink = __cpu_to_be32(info->nlink);
 167         info->uid = __cpu_to_be32(info->uid);
 168         info->gid = __cpu_to_be32(info->gid);
 169         info->blocksize = __cpu_to_be32(info->blocksize);
 170         info->blocks = __cpu_to_be64(info->blocks);
 171         info->rdev = __cpu_to_be64(info->rdev);
 172         info->size = __cpu_to_be64(info->size);
 173         info->version = __cpu_to_be64(info->version);
 174         info->ino = __cpu_to_be64(info->ino);
 175 }
 176
 177 /*
 178  * Cache state machine.
 179  */
 180 enum {
 181         NETFS_COMMAND_PENDING = 0,      /* Command is being executed */
 182         NETFS_INODE_REMOTE_SYNCED,      /* Inode was synced to server */
 183         NETFS_INODE_REMOTE_DIR_SYNCED,  /* Inode (directory) was synced from the server */
 184         NETFS_INODE_OWNED,              /* Inode is owned by given host */
 185         NETFS_INODE_NEED_FLUSH,         /* Inode has to be flushed to the server */
 186 };
 187
 188 /*
 189  * POHMELFS capabilities: information about supported
 190  * crypto operations (hash/cipher, modes, key sizes and so on),
 191  * root informaion (used/available size, number of objects, permissions)
 192  */
 193 enum pohmelfs_capabilities {
 194         POHMELFS_CRYPTO_CAPABILITIES = 0,
 195         POHMELFS_ROOT_CAPABILITIES,
 196 };
 197
 198 /* Read-only mount */
 199 #define POHMELFS_FLAGS_RO               (1<<0)
 200 /* Extended attributes support on/off */
 201 #define POHMELFS_FLAGS_XATTR            (1<<1)
 202
 203 struct netfs_root_capabilities
 204 {
 205         __u64                   nr_files;
 206         __u64                   used, avail;
 207         __u64                   flags;
 208 };
 209
 210 static inline void netfs_convert_root_capabilities(struct netfs_root_capabilities *cap)
 211 {
 212         cap->nr_files = __cpu_to_be64(cap->nr_files);
 213         cap->used = __cpu_to_be64(cap->used);
 214         cap->avail = __cpu_to_be64(cap->avail);
 215         cap->flags = __cpu_to_be64(cap->flags);
 216 }
 217
 218 struct netfs_crypto_capabilities
 219 {
 220         unsigned short          hash_strlen;    /* Hash string length, like "hmac(sha1) including 0 byte "*/
 221         unsigned short          cipher_strlen;  /* Cipher string length with the same format */
 222         unsigned int            cipher_keysize; /* Cipher key size */
 223 };
 224
 225 static inline void netfs_convert_crypto_capabilities(struct netfs_crypto_capabilities *cap)
 226 {
 227         cap->hash_strlen = __cpu_to_be16(cap->hash_strlen);
 228         cap->cipher_strlen = __cpu_to_be16(cap->cipher_strlen);
 229         cap->cipher_keysize = __cpu_to_be32(cap->cipher_keysize);
 230 }
 231
 232 enum pohmelfs_lock_type {
 233         POHMELFS_LOCK_GRAB      = (1<<15),
 234
 235         POHMELFS_READ_LOCK      = 0,
 236         POHMELFS_WRITE_LOCK,
 237 };
 238
 239 struct netfs_lock
 240 {
 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 {
 268         struct rb_node          hash_node;
 269
 270         struct list_head        sync_create_entry;
 271
 272         u64                     ino;
 273
 274         u32                     hash;
 275         u32                     mode;
 276         u32                     len;
 277
 278         char                    *data;
 279 };
 280
 281 /*
 282  * POHMELFS inode. Main object.
 283  */
 284 struct pohmelfs_inode
 285 {
 286         struct list_head        inode_entry;            /* Entry in superblock list.
 287                                                          * Objects which are not bound to dentry require to be dropped
 288                                                          * in ->put_super()
 289                                                          */
 290         struct rb_root          hash_root;              /* The same, but indexed by name hash and len */
 291         struct mutex            offset_lock;            /* Protect both above trees */
 292
 293         struct list_head        sync_create_list;       /* List of created but not yet synced to the server children */
 294
 295         unsigned int            drop_count;
 296
 297         int                     lock_type;              /* How this inode is locked: read or write */
 298
 299         int                     error;                  /* Transaction error for given inode */
 300
 301         long                    state;                  /* State machine above */
 302
 303         u64                     ino;                    /* Inode number */
 304         u64                     total_len;              /* Total length of all children names, used to create offsets */
 305
 306         struct inode            vfs_inode;
 307 };
 308
 309 struct netfs_trans;
 310 typedef int (* netfs_trans_complete_t)(struct page **pages, unsigned int page_num,
 311                 void *private, int err);
 312
 313 struct netfs_state;
 314 struct pohmelfs_sb;
 315
 316 struct netfs_trans
 317 {
 318         /*
 319          * Transaction header and attached contiguous data live here.
 320          */
 321         struct iovec                    iovec;
 322
 323         /*
 324          * Pages attached to transaction.
 325          */
 326         struct page                     **pages;
 327
 328         /*
 329          * List and protecting lock for transaction destination
 330          * network states.
 331          */
 332         spinlock_t                      dst_lock;
 333         struct list_head                dst_list;
 334
 335         /*
 336          * Number of users for given transaction.
 337          * For example each network state attached to transaction
 338          * via dst_list increases it.
 339          */
 340         atomic_t                        refcnt;
 341
 342         /*
 343          * Number of pages attached to given transaction.
 344          * Some slots in above page array can be NULL, since
 345          * for example page can be under writeback already,
 346          * so we skip it in this transaction.
 347          */
 348         unsigned int                    page_num;
 349
 350         /*
 351          * Transaction flags: single dst or broadcast and so on.
 352          */
 353         unsigned int                    flags;
 354
 355         /*
 356          * Size of the data, which can be placed into
 357          * iovec.iov_base area.
 358          */
 359         unsigned int                    total_size;
 360
 361         /*
 362          * Number of pages to be sent to remote server.
 363          * Usually equal to above page_num, but in case of partial
 364          * writeback it can accumulate only pages already completed
 365          * previous writeback.
 366          */
 367         unsigned int                    attached_pages;
 368
 369         /*
 370          * Attached number of bytes in all above pages.
 371          */
 372         unsigned int                    attached_size;
 373
 374         /*
 375          * Unique transacton generation number.
 376          * Used as identity in the network state tree of transactions.
 377          */
 378         unsigned int                    gen;
 379
 380         /*
 381          * Transaction completion status.
 382          */
 383         int                             result;
 384
 385         /*
 386          * Superblock this transaction belongs to
 387          */
 388         struct pohmelfs_sb              *psb;
 389
 390         /*
 391          * Crypto engine, which processed this transaction.
 392          * Can be not NULL only if crypto engine holds encrypted pages.
 393          */
 394         struct pohmelfs_crypto_engine   *eng;
 395
 396         /* Private data */
 397         void                            *private;
 398
 399         /* Completion callback, invoked just before transaction is destroyed */
 400         netfs_trans_complete_t          complete;
 401 };
 402
 403 static inline int netfs_trans_cur_len(struct netfs_trans *t)
 404 {
 405         return (signed)(t->total_size - t->iovec.iov_len);
 406 }
 407
 408 static inline void *netfs_trans_current(struct netfs_trans *t)
 409 {
 410         return t->iovec.iov_base + t->iovec.iov_len;
 411 }
 412
 413 struct netfs_trans *netfs_trans_alloc(struct pohmelfs_sb *psb, unsigned int size,
 414                 unsigned int flags, unsigned int nr);
 415 void netfs_trans_free(struct netfs_trans *t);
 416 int netfs_trans_finish(struct netfs_trans *t, struct pohmelfs_sb *psb);
 417 int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb);
 418
 419 static inline void netfs_trans_reset(struct netfs_trans *t)
 420 {
 421         t->complete = NULL;
 422 }
 423
 424 struct netfs_trans_dst
 425 {
 426         struct list_head                trans_entry;
 427         struct rb_node                  state_entry;
 428
 429         unsigned long                   send_time;
 430
 431         /*
 432          * Times this transaction was resent to its old or new,
 433          * depending on flags, destinations. When it reaches maximum
 434          * allowed number, specified in superblock->trans_retries,
 435          * transaction will be freed with ETIMEDOUT error.
 436          */
 437         unsigned int                    retries;
 438
 439         struct netfs_trans              *trans;
 440         struct netfs_state              *state;
 441 };
 442
 443 struct netfs_trans_dst *netfs_trans_search(struct netfs_state *st, unsigned int gen);
 444 void netfs_trans_drop_dst(struct netfs_trans_dst *dst);
 445 void netfs_trans_drop_dst_nostate(struct netfs_trans_dst *dst);
 446 void netfs_trans_drop_trans(struct netfs_trans *t, struct netfs_state *st);
 447 void netfs_trans_drop_last(struct netfs_trans *t, struct netfs_state *st);
 448 int netfs_trans_resend(struct netfs_trans *t, struct pohmelfs_sb *psb);
 449 int netfs_trans_remove_nolock(struct netfs_trans_dst *dst, struct netfs_state *st);
 450
 451 int netfs_trans_init(void);
 452 void netfs_trans_exit(void);
 453
 454 struct pohmelfs_crypto_engine
 455 {
 456         u64                             iv;             /* Crypto IV for current operation */
 457         unsigned long                   timeout;        /* Crypto waiting timeout */
 458         unsigned int                    size;           /* Size of crypto scratchpad */
 459         void                            *data;          /* Temporal crypto scratchpad */
 460         /*
 461          * Crypto operations performed on objects.
 462          */
 463         struct crypto_hash              *hash;
 464         struct crypto_ablkcipher        *cipher;
 465
 466         struct pohmelfs_crypto_thread   *thread;        /* Crypto thread which hosts this engine */
 467
 468         struct page                     **pages;
 469         unsigned int                    page_num;
 470 };
 471
 472 struct pohmelfs_crypto_thread
 473 {
 474         struct list_head                thread_entry;
 475
 476         struct task_struct              *thread;
 477         struct pohmelfs_sb              *psb;
 478
 479         struct pohmelfs_crypto_engine   eng;
 480
 481         struct netfs_trans              *trans;
 482
 483         wait_queue_head_t               wait;
 484         int                             error;
 485
 486         unsigned int                    size;
 487         struct page                     *page;
 488 };
 489
 490 void pohmelfs_crypto_thread_make_ready(struct pohmelfs_crypto_thread *th);
 491
 492 /*
 493  * Network state, attached to one server.
 494  */
 495 struct netfs_state
 496 {
 497         struct mutex            __state_lock;           /* Can not allow to use the same socket simultaneously */
 498         struct mutex            __state_send_lock;
 499         struct netfs_cmd        cmd;                    /* Cached command */
 500         struct netfs_inode_info info;                   /* Cached inode info */
 501
 502         void                    *data;                  /* Cached some data */
 503         unsigned int            size;                   /* Size of that data */
 504
 505         struct pohmelfs_sb      *psb;                   /* Superblock */
 506
 507         struct task_struct      *thread;                /* Async receiving thread */
 508
 509         /* Waiting/polling machinery */
 510         wait_queue_t            wait;
 511         wait_queue_head_t       *whead;
 512         wait_queue_head_t       thread_wait;
 513
 514         struct mutex            trans_lock;
 515         struct rb_root          trans_root;
 516
 517         struct pohmelfs_ctl     ctl;                    /* Remote peer */
 518
 519         struct socket           *socket;                /* Socket object */
 520         struct socket           *read_socket;           /* Cached pointer to socket object.
 521                                                          * Used to determine if between lock drops socket was changed.
 522                                                          * Never used to read data or any kind of access.
 523                                                          */
 524         /*
 525          * Crypto engines to process incoming data.
 526          */
 527         struct pohmelfs_crypto_engine   eng;
 528
 529         int                     need_reset;
 530 };
 531
 532 int netfs_state_init(struct netfs_state *st);
 533 void netfs_state_exit(struct netfs_state *st);
 534
 535 static inline void netfs_state_lock_send(struct netfs_state *st)
 536 {
 537         mutex_lock(&st->__state_send_lock);
 538 }
 539
 540 static inline int netfs_state_trylock_send(struct netfs_state *st)
 541 {
 542         return mutex_trylock(&st->__state_send_lock);
 543 }
 544
 545 static inline void netfs_state_unlock_send(struct netfs_state *st)
 546 {
 547         BUG_ON(!mutex_is_locked(&st->__state_send_lock));
 548
 549         mutex_unlock(&st->__state_send_lock);
 550 }
 551
 552 static inline void netfs_state_lock(struct netfs_state *st)
 553 {
 554         mutex_lock(&st->__state_lock);
 555 }
 556
 557 static inline void netfs_state_unlock(struct netfs_state *st)
 558 {
 559         BUG_ON(!mutex_is_locked(&st->__state_lock));
 560
 561         mutex_unlock(&st->__state_lock);
 562 }
 563
 564 static inline unsigned int netfs_state_poll(struct netfs_state *st)
 565 {
 566         unsigned int revents = POLLHUP | POLLERR;
 567
 568         netfs_state_lock(st);
 569         if (st->socket)
 570                 revents = st->socket->ops->poll(NULL, st->socket, NULL);
 571         netfs_state_unlock(st);
 572
 573         return revents;
 574 }
 575
 576 struct pohmelfs_config;
 577
 578 struct pohmelfs_sb
 579 {
 580         struct rb_root          mcache_root;
 581         struct mutex            mcache_lock;
 582         atomic_long_t           mcache_gen;
 583         unsigned long           mcache_timeout;
 584
 585         unsigned int            idx;
 586
 587         unsigned int            trans_retries;
 588
 589         atomic_t                trans_gen;
 590
 591         unsigned int            crypto_attached_size;
 592         unsigned int            crypto_align_size;
 593
 594         unsigned int            crypto_fail_unsupported;
 595
 596         unsigned int            crypto_thread_num;
 597         struct list_head        crypto_active_list, crypto_ready_list;
 598         struct mutex            crypto_thread_lock;
 599
 600         unsigned int            trans_max_pages;
 601         unsigned long           trans_data_size;
 602         unsigned long           trans_timeout;
 603
 604         unsigned long           drop_scan_timeout;
 605         unsigned long           trans_scan_timeout;
 606
 607         unsigned long           wait_on_page_timeout;
 608
 609         struct list_head        flush_list;
 610         struct list_head        drop_list;
 611         spinlock_t              ino_lock;
 612         u64                     ino;
 613
 614         /*
 615          * Remote nodes POHMELFS connected to.
 616          */
 617         struct list_head        state_list;
 618         struct mutex            state_lock;
 619
 620         /*
 621          * Currently active state to request data from.
 622          */
 623         struct pohmelfs_config  *active_state;
 624
 625
 626         wait_queue_head_t       wait;
 627
 628         /*
 629          * Timed checks: stale transactions, inodes to be freed and so on.
 630          */
 631         struct delayed_work     dwork;
 632         struct delayed_work     drop_dwork;
 633
 634         struct super_block      *sb;
 635
 636         /*
 637          * Algorithm strings.
 638          */
 639         char                    *hash_string;
 640         char                    *cipher_string;
 641
 642         u8                      *hash_key;
 643         u8                      *cipher_key;
 644
 645         /*
 646          * Algorithm string lengths.
 647          */
 648         unsigned int            hash_strlen;
 649         unsigned int            cipher_strlen;
 650         unsigned int            hash_keysize;
 651         unsigned int            cipher_keysize;
 652
 653         /*
 654          * Controls whether to perfrom crypto processing or not.
 655          */
 656         int                     perform_crypto;
 657
 658         /*
 659          * POHMELFS statistics.
 660          */
 661         u64                     total_size;
 662         u64                     avail_size;
 663         atomic_long_t           total_inodes;
 664
 665         /*
 666          * Xattr support, read-only and so on.
 667          */
 668         u64                     state_flags;
 669
 670         /*
 671          * Temporary storage to detect changes in the wait queue.
 672          */
 673         long                    flags;
 674 };
 675
 676 static inline void netfs_trans_update(struct netfs_cmd *cmd,
 677                 struct netfs_trans *t, unsigned int size)
 678 {
 679         unsigned int sz = ALIGN(size, t->psb->crypto_align_size);
 680
 681         t->iovec.iov_len += sizeof(struct netfs_cmd) + sz;
 682         cmd->cpad = __cpu_to_be16(sz - size);
 683 }
 684
 685 static inline struct pohmelfs_sb *POHMELFS_SB(struct super_block *sb)
 686 {
 687         return sb->s_fs_info;
 688 }
 689
 690 static inline struct pohmelfs_inode *POHMELFS_I(struct inode *inode)
 691 {
 692         return container_of(inode, struct pohmelfs_inode, vfs_inode);
 693 }
 694
 695 static inline u64 pohmelfs_new_ino(struct pohmelfs_sb *psb)
 696 {
 697         u64 ino;
 698
 699         spin_lock(&psb->ino_lock);
 700         ino = psb->ino++;
 701         spin_unlock(&psb->ino_lock);
 702
 703         return ino;
 704 }
 705
 706 static inline void pohmelfs_put_inode(struct pohmelfs_inode *pi)
 707 {
 708         struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb);
 709
 710         spin_lock(&psb->ino_lock);
 711         list_move_tail(&pi->inode_entry, &psb->drop_list);
 712         pi->drop_count++;
 713         spin_unlock(&psb->ino_lock);
 714 }
 715
 716 struct pohmelfs_config
 717 {
 718         struct list_head        config_entry;
 719
 720         struct netfs_state      state;
 721 };
 722
 723 struct pohmelfs_config_group
 724 {
 725         /*
 726          * Entry in the global config group list.
 727          */
 728         struct list_head        group_entry;
 729
 730         /*
 731          * Index of the current group.
 732          */
 733         unsigned int            idx;
 734         /*
 735          * Number of config_list entries in this group entry.
 736          */
 737         unsigned int            num_entry;
 738         /*
 739          * Algorithm strings.
 740          */
 741         char                    *hash_string;
 742         char                    *cipher_string;
 743
 744         /*
 745          * Algorithm string lengths.
 746          */
 747         unsigned int            hash_strlen;
 748         unsigned int            cipher_strlen;
 749
 750         /*
 751          * Key and its size.
 752          */
 753         unsigned int            hash_keysize;
 754         unsigned int            cipher_keysize;
 755         u8                      *hash_key;
 756         u8                      *cipher_key;
 757
 758         /*
 759          * List of config entries (network state info) for given idx.
 760          */
 761         struct list_head        config_list;
 762 };
 763
 764 int __init pohmelfs_config_init(void);
 765 void pohmelfs_config_exit(void);
 766 int pohmelfs_copy_config(struct pohmelfs_sb *psb);
 767 int pohmelfs_copy_crypto(struct pohmelfs_sb *psb);
 768 int pohmelfs_config_check(struct pohmelfs_config *config, int idx);
 769 int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf);
 770
 771 extern const struct file_operations pohmelfs_dir_fops;
 772 extern const struct inode_operations pohmelfs_dir_inode_ops;
 773
 774 int pohmelfs_state_init(struct pohmelfs_sb *psb);
 775 void pohmelfs_state_exit(struct pohmelfs_sb *psb);
 776 void pohmelfs_state_flush_transactions(struct netfs_state *st);
 777
 778 void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info);
 779
 780 void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
 781 void pohmelfs_free_names(struct pohmelfs_inode *parent);
 782 struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash);
 783
 784 void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi);
 785
 786 struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb,
 787         struct pohmelfs_inode *parent, struct qstr *str, u64 start, int mode);
 788
 789 int pohmelfs_write_create_inode(struct pohmelfs_inode *pi);
 790
 791 int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans);
 792 int pohmelfs_remove_child(struct pohmelfs_inode *parent, struct pohmelfs_name *n);
 793
 794 struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb,
 795                 struct pohmelfs_inode *parent, struct qstr *str,
 796                 struct netfs_inode_info *info, int link);
 797
 798 int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr);
 799 int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr);
 800
 801 int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags,
 802                 netfs_trans_complete_t complete, void *priv, u64 start);
 803 int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon,
 804                 unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start);
 805
 806 void pohmelfs_check_states(struct pohmelfs_sb *psb);
 807 void pohmelfs_switch_active(struct pohmelfs_sb *psb);
 808
 809 int pohmelfs_construct_path_string(struct pohmelfs_inode *pi, void *data, int len);
 810 int pohmelfs_path_length(struct pohmelfs_inode *pi);
 811
 812 struct pohmelfs_crypto_completion
 813 {
 814         struct completion       complete;
 815         int                     error;
 816 };
 817
 818 int pohmelfs_trans_crypt(struct netfs_trans *t, struct pohmelfs_sb *psb);
 819 void pohmelfs_crypto_exit(struct pohmelfs_sb *psb);
 820 int pohmelfs_crypto_init(struct pohmelfs_sb *psb);
 821
 822 int pohmelfs_crypto_engine_init(struct pohmelfs_crypto_engine *e, struct pohmelfs_sb *psb);
 823 void pohmelfs_crypto_engine_exit(struct pohmelfs_crypto_engine *e);
 824
 825 int pohmelfs_crypto_process_input_data(struct pohmelfs_crypto_engine *e, u64 iv,
 826                 void *data, struct page *page, unsigned int size);
 827 int pohmelfs_crypto_process_input_page(struct pohmelfs_crypto_engine *e,
 828                 struct page *page, unsigned int size, u64 iv);
 829
 830 static inline u64 pohmelfs_gen_iv(struct netfs_trans *t)
 831 {
 832         u64 iv = t->gen;
 833
 834         iv <<= 32;
 835         iv |= ((unsigned long)t) & 0xffffffff;
 836
 837         return iv;
 838 }
 839
 840 int pohmelfs_data_lock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
 841 int pohmelfs_data_unlock(struct pohmelfs_inode *pi, u64 start, u32 size, int type);
 842 int pohmelfs_data_lock_response(struct netfs_state *st);
 843
 844 static inline int pohmelfs_need_lock(struct pohmelfs_inode *pi, int type)
 845 {
 846         if (test_bit(NETFS_INODE_OWNED, &pi->state)) {
 847                 if (type == pi->lock_type)
 848                         return 0;
 849                 if ((type == POHMELFS_READ_LOCK) && (pi->lock_type == POHMELFS_WRITE_LOCK))
 850                         return 0;
 851         }
 852
 853         if (!test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state))
 854                 return 0;
 855
 856         return 1;
 857 }
 858
 859 int __init pohmelfs_mcache_init(void);
 860 void pohmelfs_mcache_exit(void);
 861
 862 //#define CONFIG_POHMELFS_DEBUG
 863
 864 #ifdef CONFIG_POHMELFS_DEBUG
 865 #define dprintka(f, a...) printk(f, ##a)
 866 #define dprintk(f, a...) printk("%d: " f, task_pid_vnr(current), ##a)
 867 #else
 868 #define dprintka(f, a...) do {} while (0)
 869 #define dprintk(f, a...) do {} while (0)
 870 #endif
 871
 872 static inline void netfs_trans_get(struct netfs_trans *t)
 873 {
 874         atomic_inc(&t->refcnt);
 875 }
 876
 877 static inline void netfs_trans_put(struct netfs_trans *t)
 878 {
 879         if (atomic_dec_and_test(&t->refcnt)) {
 880                 dprintk("%s: t: %p, gen: %u, err: %d.\n",
 881                         __func__, t, t->gen, t->result);
 882                 if (t->complete)
 883                         t->complete(t->pages, t->page_num,
 884                                 t->private, t->result);
 885                 netfs_trans_free(t);
 886         }
 887 }
 888
 889 struct pohmelfs_mcache
 890 {
 891         struct rb_node                  mcache_entry;
 892         struct completion               complete;
 893
 894         atomic_t                        refcnt;
 895
 896         u64                             gen;
 897
 898         void                            *data;
 899         u64                             start;
 900         u32                             size;
 901         int                             err;
 902
 903         struct netfs_inode_info         info;
 904 };
 905
 906 struct pohmelfs_mcache *pohmelfs_mcache_alloc(struct pohmelfs_sb *psb, u64 start,
 907                 unsigned int size, void *data);
 908 void pohmelfs_mcache_free(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
 909 struct pohmelfs_mcache *pohmelfs_mcache_search(struct pohmelfs_sb *psb, u64 gen);
 910 void pohmelfs_mcache_remove_locked(struct pohmelfs_sb *psb, struct pohmelfs_mcache *m);
 911
 912 static inline void pohmelfs_mcache_get(struct pohmelfs_mcache *m)
 913 {
 914         atomic_inc(&m->refcnt);
 915 }
 916
 917 static inline void pohmelfs_mcache_put(struct pohmelfs_sb *psb,
 918                 struct pohmelfs_mcache *m)
 919 {
 920         if (atomic_dec_and_test(&m->refcnt))
 921                 pohmelfs_mcache_free(psb, m);
 922 }
 923
 924 int pohmelfs_ftrans_init(void);
 925 void pohmelfs_ftrans_exit(void);
 926 void pohmelfs_ftrans_update(u64 id);
 927 int pohmelfs_ftrans_check(u64 id);
 928 void pohmelfs_ftrans_clean(u64 id);
 929
 930 #endif /* __KERNEL__*/
 931
 932 #endif /* __NETFS_H */