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