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