sys/vfs/hammer2/hammer2.h

   1 /*
   2  * Copyright (c) 2011-2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * HAMMER2 IN-MEMORY CACHE OF MEDIA STRUCTURES
  38  *
  39  * This header file contains structures used internally by the HAMMER2
  40  * implementation.  See hammer2_disk.h for on-disk structures.
  41  *
  42  * There is an in-memory representation of all on-media data structure.
  43  * Almost everything is represented by a hammer2_chain structure in-memory.
  44  * Other higher-level structures typically map to chains.
  45  *
  46  * A great deal of data is accessed simply via its buffer cache buffer,
  47  * which is mapped for the duration of the chain's lock.  Hammer2 must
  48  * implement its own buffer cache layer on top of the system layer to
  49  * allow for different threads to lock different sub-block-sized buffers.
  50  *
  51  * When modifications are made to a chain a new filesystem block must be
  52  * allocated.  Multiple modifications do not typically allocate new blocks
  53  * until the current block has been flushed.  Flushes do not block the
  54  * front-end unless the front-end operation crosses the current inode being
  55  * flushed.
  56  *
  57  * The in-memory representation may remain cached (for example in order to
  58  * placemark clustering locks) even after the related data has been
  59  * detached.
  60  */
  61
  62 #ifndef _VFS_HAMMER2_HAMMER2_H_
  63 #define _VFS_HAMMER2_HAMMER2_H_
  64
  65 #include <sys/param.h>
  66 #include <sys/types.h>
  67 #include <sys/kernel.h>
  68 #include <sys/conf.h>
  69 #include <sys/systm.h>
  70 #include <sys/tree.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mount.h>
  73 #include <sys/vnode.h>
  74 #include <sys/proc.h>
  75 #include <sys/mountctl.h>
  76 #include <sys/priv.h>
  77 #include <sys/stat.h>
  78 #include <sys/thread.h>
  79 #include <sys/globaldata.h>
  80 #include <sys/lockf.h>
  81 #include <sys/buf.h>
  82 #include <sys/queue.h>
  83 #include <sys/limits.h>
  84 #include <sys/signal2.h>
  85 #include <sys/dmsg.h>
  86 #include <sys/mutex.h>
  87 #include <sys/kern_syscall.h>
  88
  89 #include <sys/buf2.h>
  90 #include <sys/mutex2.h>
  91
  92 #include "hammer2_disk.h"
  93 #include "hammer2_mount.h"
  94 #include "hammer2_ioctl.h"
  95 #include "hammer2_ccms.h"
  96
  97 struct hammer2_io;
  98 struct hammer2_iocb;
  99 struct hammer2_chain;
 100 struct hammer2_cluster;
 101 struct hammer2_inode;
 102 struct hammer2_mount;
 103 struct hammer2_pfsmount;
 104 struct hammer2_span;
 105 struct hammer2_state;
 106 struct hammer2_msg;
 107
 108 /*
 109  * The xid tracks internal transactional updates.
 110  *
 111  * XXX fix-me, really needs to be 64-bits
 112  */
 113 typedef uint32_t hammer2_xid_t;
 114
 115 #define HAMMER2_XID_MIN 0x00000000U
 116 #define HAMMER2_XID_MAX 0x7FFFFFFFU
 117
 118 /*
 119  * The chain structure tracks a portion of the media topology from the
 120  * root (volume) down.  Chains represent volumes, inodes, indirect blocks,
 121  * data blocks, and freemap nodes and leafs.
 122  *
 123  * The chain structure utilizes a simple singly-homed topology and the
 124  * chain's in-memory topology will move around as the chains do, due mainly
 125  * to renames and indirect block creation.
 126  *
 127  * Block Table Updates
 128  *
 129  *      Block table updates for insertions and updates are delayed until the
 130  *      flush.  This allows us to avoid having to modify the parent chain
 131  *      all the way to the root.
 132  *
 133  *      Block table deletions are performed immediately (modifying the parent
 134  *      in the process) because the flush code uses the chain structure to
 135  *      track delayed updates and the chain will be (likely) gone or moved to
 136  *      another location in the topology after a deletion.
 137  *
 138  *      A prior iteration of the code tried to keep the relationship intact
 139  *      on deletes by doing a delete-duplicate operation on the chain, but
 140  *      it added way too much complexity to the codebase.
 141  *
 142  * Flush Synchronization
 143  *
 144  *      The flush code must flush modified chains bottom-up.  Because chain
 145  *      structures can shift around and are NOT topologically stable,
 146  *      modified chains are independently indexed for the flush.  As the flush
 147  *      runs it modifies (or further modifies) and updates the parents,
 148  *      propagating the flush all the way to the volume root.
 149  *
 150  *      Modifying front-end operations can occur during a flush but will block
 151  *      in two cases: (1) when the front-end tries to operate on the inode
 152  *      currently in the midst of being flushed and (2) if the front-end
 153  *      crosses an inode currently being flushed (such as during a rename).
 154  *      So, for example, if you rename directory "x" to "a/b/c/d/e/f/g/x" and
 155  *      the flusher is currently working on "a/b/c", the rename will block
 156  *      temporarily in order to ensure that "x" exists in one place or the
 157  *      other.
 158  *
 159  *      Meta-data statistics are updated by the flusher.  The front-end will
 160  *      make estimates but meta-data must be fully synchronized only during a
 161  *      flush in order to ensure that it remains correct across a crash.
 162  *
 163  *      Multiple flush synchronizations can theoretically be in-flight at the
 164  *      same time but the implementation is not coded to handle the case and
 165  *      currently serializes them.
 166  *
 167  * Snapshots:
 168  *
 169  *      Snapshots currently require the subdirectory tree being snapshotted
 170  *      to be flushed.  The snapshot then creates a new super-root inode which
 171  *      copies the flushed blockdata of the directory or file that was
 172  *      snapshotted.
 173  *
 174  * RBTREE NOTES:
 175  *
 176  *      - Note that the radix tree runs in powers of 2 only so sub-trees
 177  *        cannot straddle edges.
 178  */
 179 RB_HEAD(hammer2_chain_tree, hammer2_chain);
 180 TAILQ_HEAD(h2_flush_list, hammer2_chain);
 181 TAILQ_HEAD(h2_core_list, hammer2_chain);
 182 TAILQ_HEAD(h2_iocb_list, hammer2_iocb);
 183
 184 #define CHAIN_CORE_DELETE_BMAP_ENTRIES  \
 185         (HAMMER2_PBUFSIZE / sizeof(hammer2_blockref_t) / sizeof(uint32_t))
 186
 187 struct hammer2_chain_core {
 188         struct ccms_cst cst;
 189         struct hammer2_chain_tree rbtree; /* sub-chains */
 190         int             live_zero;      /* blockref array opt */
 191         u_int           flags;
 192         u_int           live_count;     /* live (not deleted) chains in tree */
 193         u_int           chain_count;    /* live + deleted chains under core */
 194         int             generation;     /* generation number (inserts only) */
 195 };
 196
 197 typedef struct hammer2_chain_core hammer2_chain_core_t;
 198
 199 #define HAMMER2_CORE_UNUSED0001         0x0001
 200 #define HAMMER2_CORE_COUNTEDBREFS       0x0002
 201
 202 RB_HEAD(hammer2_io_tree, hammer2_io);
 203
 204 /*
 205  * IOCB - IO callback (into chain, cluster, or manual request)
 206  */
 207 struct hammer2_iocb {
 208         TAILQ_ENTRY(hammer2_iocb) entry;
 209         void (*callback)(struct hammer2_iocb *iocb);
 210         struct hammer2_io       *dio;
 211         struct hammer2_cluster  *cluster;
 212         struct hammer2_chain    *chain;
 213         void                    *ptr;
 214         off_t                   lbase;
 215         int                     lsize;
 216         uint32_t                flags;
 217         int                     error;
 218 };
 219
 220 typedef struct hammer2_iocb hammer2_iocb_t;
 221
 222 #define HAMMER2_IOCB_INTERLOCK  0x00000001
 223 #define HAMMER2_IOCB_ONQ        0x00000002
 224 #define HAMMER2_IOCB_DONE       0x00000004
 225 #define HAMMER2_IOCB_INPROG     0x00000008
 226 #define HAMMER2_IOCB_UNUSED10   0x00000010
 227 #define HAMMER2_IOCB_QUICK      0x00010000
 228 #define HAMMER2_IOCB_ZERO       0x00020000
 229 #define HAMMER2_IOCB_READ       0x00040000
 230 #define HAMMER2_IOCB_WAKEUP     0x00080000
 231
 232 /*
 233  * DIO - Management structure wrapping system buffer cache.
 234  *
 235  *       Used for multiple purposes including concurrent management
 236  *       if small requests by chains into larger DIOs.
 237  */
 238 struct hammer2_io {
 239         RB_ENTRY(hammer2_io) rbnode;    /* indexed by device offset */
 240         struct h2_iocb_list iocbq;
 241         struct spinlock spin;
 242         struct hammer2_mount *hmp;
 243         struct buf      *bp;
 244         off_t           pbase;
 245         int             psize;
 246         int             refs;
 247         int             act;                    /* activity */
 248 };
 249
 250 typedef struct hammer2_io hammer2_io_t;
 251
 252 #define HAMMER2_DIO_INPROG      0x80000000      /* bio in progress */
 253 #define HAMMER2_DIO_GOOD        0x40000000      /* dio->bp is stable */
 254 #define HAMMER2_DIO_WAITING     0x20000000      /* (old) */
 255 #define HAMMER2_DIO_DIRTY       0x10000000      /* flush on last drop */
 256
 257 #define HAMMER2_DIO_MASK        0x0FFFFFFF
 258
 259 /*
 260  * Primary chain structure keeps track of the topology in-memory.
 261  */
 262 struct hammer2_chain {
 263         hammer2_chain_core_t    core;
 264         RB_ENTRY(hammer2_chain) rbnode;         /* live chain(s) */
 265         hammer2_blockref_t      bref;
 266         struct hammer2_chain    *parent;
 267         struct hammer2_state    *state;         /* if active cache msg */
 268         struct hammer2_mount    *hmp;
 269         struct hammer2_pfsmount *pmp;           /* (pfs-cluster pmp or spmp) */
 270
 271         hammer2_xid_t   flush_xid;              /* flush sequencing */
 272         hammer2_key_t   data_count;             /* delta's to apply */
 273         hammer2_key_t   inode_count;            /* delta's to apply */
 274         hammer2_key_t   data_count_up;          /* delta's to apply */
 275         hammer2_key_t   inode_count_up;         /* delta's to apply */
 276         hammer2_io_t    *dio;                   /* physical data buffer */
 277         u_int           bytes;                  /* physical data size */
 278         u_int           flags;
 279         u_int           refs;
 280         u_int           lockcnt;
 281         hammer2_media_data_t *data;             /* data pointer shortcut */
 282         TAILQ_ENTRY(hammer2_chain) flush_node;  /* flush list */
 283 };
 284
 285 typedef struct hammer2_chain hammer2_chain_t;
 286
 287 int hammer2_chain_cmp(hammer2_chain_t *chain1, hammer2_chain_t *chain2);
 288 RB_PROTOTYPE(hammer2_chain_tree, hammer2_chain, rbnode, hammer2_chain_cmp);
 289
 290 /*
 291  * Special notes on flags:
 292  *
 293  * INITIAL - This flag allows a chain to be created and for storage to
 294  *           be allocated without having to immediately instantiate the
 295  *           related buffer.  The data is assumed to be all-zeros.  It
 296  *           is primarily used for indirect blocks.
 297  *
 298  * MODIFIED- The chain's media data has been modified.
 299  * UPDATE  - Chain might not be modified but parent blocktable needs update
 300  *
 301  * BMAPPED - Indicates that the chain is present in the parent blockmap.
 302  * BMAPUPD - Indicates that the chain is present but needs to be updated
 303  *           in the parent blockmap.
 304  */
 305 #define HAMMER2_CHAIN_MODIFIED          0x00000001      /* dirty chain data */
 306 #define HAMMER2_CHAIN_ALLOCATED         0x00000002      /* kmalloc'd chain */
 307 #define HAMMER2_CHAIN_DESTROY           0x00000004
 308 #define HAMMER2_CHAIN_UNLINKED          0x00000008      /* unlinked file */
 309 #define HAMMER2_CHAIN_DELETED           0x00000010      /* deleted chain */
 310 #define HAMMER2_CHAIN_INITIAL           0x00000020      /* initial create */
 311 #define HAMMER2_CHAIN_UPDATE            0x00000040      /* need parent update */
 312 #define HAMMER2_CHAIN_DEFERRED          0x00000080      /* flush depth defer */
 313 #define HAMMER2_CHAIN_IOFLUSH           0x00000100      /* bawrite on put */
 314 #define HAMMER2_CHAIN_ONFLUSH           0x00000200      /* on a flush list */
 315 #define HAMMER2_CHAIN_UNUSED00000400    0x00000400
 316 #define HAMMER2_CHAIN_VOLUMESYNC        0x00000800      /* needs volume sync */
 317 #define HAMMER2_CHAIN_UNUSED00001000    0x00001000
 318 #define HAMMER2_CHAIN_MOUNTED           0x00002000      /* PFS is mounted */
 319 #define HAMMER2_CHAIN_ONRBTREE          0x00004000      /* on parent RB tree */
 320 #define HAMMER2_CHAIN_SNAPSHOT          0x00008000      /* snapshot special */
 321 #define HAMMER2_CHAIN_EMBEDDED          0x00010000      /* embedded data */
 322 #define HAMMER2_CHAIN_RELEASE           0x00020000      /* don't keep around */
 323 #define HAMMER2_CHAIN_BMAPPED           0x00040000      /* present in blkmap */
 324 #define HAMMER2_CHAIN_BMAPUPD           0x00080000      /* +needs updating */
 325 #define HAMMER2_CHAIN_UNUSED00100000    0x00100000
 326 #define HAMMER2_CHAIN_UNUSED00200000    0x00200000
 327 #define HAMMER2_CHAIN_PFSBOUNDARY       0x00400000      /* super->pfs inode */
 328
 329 #define HAMMER2_CHAIN_FLUSH_MASK        (HAMMER2_CHAIN_MODIFIED |       \
 330                                          HAMMER2_CHAIN_UPDATE |         \
 331                                          HAMMER2_CHAIN_ONFLUSH)
 332
 333 /*
 334  * Flags passed to hammer2_chain_lookup() and hammer2_chain_next()
 335  *
 336  * NOTE: MATCHIND allows an indirect block / freemap node to be returned
 337  *       when the passed key range matches the radix.  Remember that key_end
 338  *       is inclusive (e.g. {0x000,0xFFF}, not {0x000,0x1000}).
 339  */
 340 #define HAMMER2_LOOKUP_NOLOCK           0x00000001      /* ref only */
 341 #define HAMMER2_LOOKUP_NODATA           0x00000002      /* data left NULL */
 342 #define HAMMER2_LOOKUP_SHARED           0x00000100
 343 #define HAMMER2_LOOKUP_MATCHIND         0x00000200      /* return all chains */
 344 #define HAMMER2_LOOKUP_UNUSED0400       0x00000400
 345 #define HAMMER2_LOOKUP_ALWAYS           0x00000800      /* resolve data */
 346
 347 /*
 348  * Flags passed to hammer2_chain_modify() and hammer2_chain_resize()
 349  *
 350  * NOTE: OPTDATA allows us to avoid instantiating buffers for INDIRECT
 351  *       blocks in the INITIAL-create state.
 352  */
 353 #define HAMMER2_MODIFY_OPTDATA          0x00000002      /* data can be NULL */
 354 #define HAMMER2_MODIFY_NO_MODIFY_TID    0x00000004
 355 #define HAMMER2_MODIFY_UNUSED0008       0x00000008
 356 #define HAMMER2_MODIFY_NOREALLOC        0x00000010
 357
 358 /*
 359  * Flags passed to hammer2_chain_lock()
 360  */
 361 #define HAMMER2_RESOLVE_NEVER           1
 362 #define HAMMER2_RESOLVE_MAYBE           2
 363 #define HAMMER2_RESOLVE_ALWAYS          3
 364 #define HAMMER2_RESOLVE_MASK            0x0F
 365
 366 #define HAMMER2_RESOLVE_SHARED          0x10    /* request shared lock */
 367 #define HAMMER2_RESOLVE_NOREF           0x20    /* already ref'd on lock */
 368
 369 /*
 370  * Flags passed to hammer2_chain_delete()
 371  */
 372 #define HAMMER2_DELETE_PERMANENT        0x0001
 373 #define HAMMER2_DELETE_NOSTATS          0x0002
 374
 375 #define HAMMER2_INSERT_NOSTATS          0x0002
 376
 377 /*
 378  * Flags passed to hammer2_chain_delete_duplicate()
 379  */
 380 #define HAMMER2_DELDUP_RECORE           0x0001
 381
 382 /*
 383  * Cluster different types of storage together for allocations
 384  */
 385 #define HAMMER2_FREECACHE_INODE         0
 386 #define HAMMER2_FREECACHE_INDIR         1
 387 #define HAMMER2_FREECACHE_DATA          2
 388 #define HAMMER2_FREECACHE_UNUSED3       3
 389 #define HAMMER2_FREECACHE_TYPES         4
 390
 391 /*
 392  * hammer2_freemap_alloc() block preference
 393  */
 394 #define HAMMER2_OFF_NOPREF              ((hammer2_off_t)-1)
 395
 396 /*
 397  * BMAP read-ahead maximum parameters
 398  */
 399 #define HAMMER2_BMAP_COUNT              16      /* max bmap read-ahead */
 400 #define HAMMER2_BMAP_BYTES              (HAMMER2_PBUFSIZE * HAMMER2_BMAP_COUNT)
 401
 402 /*
 403  * hammer2_freemap_adjust()
 404  */
 405 #define HAMMER2_FREEMAP_DORECOVER       1
 406 #define HAMMER2_FREEMAP_DOMAYFREE       2
 407 #define HAMMER2_FREEMAP_DOREALFREE      3
 408
 409 /*
 410  * HAMMER2 cluster - A set of chains representing the same entity.
 411  *
 412  * The hammer2_pfsmount structure embeds a hammer2_cluster.  All other
 413  * hammer2_cluster use cases use temporary allocations.
 414  *
 415  * The cluster API mimics the chain API.  Except as used in the pfsmount,
 416  * the cluster structure is a temporary 'working copy' of a set of chains
 417  * representing targets compatible with the operation.  However, for
 418  * performance reasons the cluster API does not necessarily issue concurrent
 419  * requests to the underlying chain API for all compatible chains all the
 420  * time.  This may sometimes necessitate revisiting parent cluster nodes
 421  * to 'flesh out' (validate more chains).
 422  *
 423  * If an insufficient number of chains remain in a working copy, the operation
 424  * may have to be downgraded, retried, or stall until the requisit number
 425  * of chains are available.
 426  */
 427 #define HAMMER2_MAXCLUSTER      8
 428
 429 struct hammer2_cluster {
 430         int                     status;         /* operational status */
 431         int                     refs;           /* track for deallocation */
 432         struct hammer2_pfsmount *pmp;
 433         uint32_t                flags;
 434         int                     nchains;
 435         hammer2_iocb_t          iocb;
 436         hammer2_chain_t         *focus;         /* current focus (or mod) */
 437         hammer2_chain_t         *array[HAMMER2_MAXCLUSTER];
 438         char                    missed[HAMMER2_MAXCLUSTER];
 439         int                     cache_index[HAMMER2_MAXCLUSTER];
 440 };
 441
 442 typedef struct hammer2_cluster hammer2_cluster_t;
 443
 444 #define HAMMER2_CLUSTER_INODE   0x00000001      /* embedded in inode */
 445 #define HAMMER2_CLUSTER_NOSYNC  0x00000002      /* not in sync (cumulative) */
 446
 447
 448 RB_HEAD(hammer2_inode_tree, hammer2_inode);
 449
 450 /*
 451  * A hammer2 inode.
 452  *
 453  * NOTE: The inode's attribute CST which is also used to lock the inode
 454  *       is embedded in the chain (chain.cst) and aliased w/ attr_cst.
 455  *
 456  * NOTE: The inode-embedded cluster is never used directly for I/O (since
 457  *       it may be shared).  Instead it will be replicated-in and synchronized
 458  *       back out if changed.
 459  */
 460 struct hammer2_inode {
 461         RB_ENTRY(hammer2_inode) rbnode;         /* inumber lookup (HL) */
 462         ccms_cst_t              topo_cst;       /* directory topology cst */
 463         struct hammer2_pfsmount *pmp;           /* PFS mount */
 464         struct hammer2_inode    *pip;           /* parent inode */
 465         struct vnode            *vp;
 466         hammer2_cluster_t       cluster;
 467         struct lockf            advlock;
 468         hammer2_tid_t           inum;
 469         u_int                   flags;
 470         u_int                   refs;           /* +vpref, +flushref */
 471         uint8_t                 comp_heuristic;
 472         hammer2_off_t           size;
 473         uint64_t                mtime;
 474 };
 475
 476 typedef struct hammer2_inode hammer2_inode_t;
 477
 478 #define HAMMER2_INODE_MODIFIED          0x0001
 479 #define HAMMER2_INODE_SROOT             0x0002  /* kmalloc special case */
 480 #define HAMMER2_INODE_RENAME_INPROG     0x0004
 481 #define HAMMER2_INODE_ONRBTREE          0x0008
 482 #define HAMMER2_INODE_RESIZED           0x0010
 483 #define HAMMER2_INODE_MTIME             0x0020
 484
 485 int hammer2_inode_cmp(hammer2_inode_t *ip1, hammer2_inode_t *ip2);
 486 RB_PROTOTYPE2(hammer2_inode_tree, hammer2_inode, rbnode, hammer2_inode_cmp,
 487                 hammer2_tid_t);
 488
 489 /*
 490  * inode-unlink side-structure
 491  */
 492 struct hammer2_inode_unlink {
 493         TAILQ_ENTRY(hammer2_inode_unlink) entry;
 494         hammer2_inode_t *ip;
 495 };
 496 TAILQ_HEAD(h2_unlk_list, hammer2_inode_unlink);
 497
 498 typedef struct hammer2_inode_unlink hammer2_inode_unlink_t;
 499
 500 /*
 501  * A hammer2 transaction and flush sequencing structure.
 502  *
 503  * This global structure is tied into hammer2_mount and is used
 504  * to sequence modifying operations and flushes.
 505  *
 506  * (a) Any modifying operations with sync_tid >= flush_tid will stall until
 507  *     all modifying operating with sync_tid < flush_tid complete.
 508  *
 509  *     The flush related to flush_tid stalls until all modifying operations
 510  *     with sync_tid < flush_tid complete.
 511  *
 512  * (b) Once unstalled, modifying operations with sync_tid > flush_tid are
 513  *     allowed to run.  All modifications cause modify/duplicate operations
 514  *     to occur on the related chains.  Note that most INDIRECT blocks will
 515  *     be unaffected because the modifications just overload the RBTREE
 516  *     structurally instead of actually modifying the indirect blocks.
 517  *
 518  * (c) The actual flush unstalls and RUNS CONCURRENTLY with (b), but only
 519  *     utilizes the chain structures with sync_tid <= flush_tid.  The
 520  *     flush will modify related indirect blocks and inodes in-place
 521  *     (rather than duplicate) since the adjustments are compatible with
 522  *     (b)'s RBTREE overloading
 523  *
 524  *     SPECIAL NOTE:  Inode modifications have to also propagate along any
 525  *                    modify/duplicate chains.  File writes detect the flush
 526  *                    and force out the conflicting buffer cache buffer(s)
 527  *                    before reusing them.
 528  *
 529  * (d) Snapshots can be made instantly but must be flushed and disconnected
 530  *     from their duplicative source before they can be mounted.  This is
 531  *     because while H2's on-media structure supports forks, its in-memory
 532  *     structure only supports very simple forking for background flushing
 533  *     purposes.
 534  *
 535  * TODO: Flush merging.  When fsync() is called on multiple discrete files
 536  *       concurrently there is no reason to stall the second fsync.
 537  *       The final flush that reaches to root can cover both fsync()s.
 538  *
 539  *     The chains typically terminate as they fly onto the disk.  The flush
 540  *     ultimately reaches the volume header.
 541  */
 542 struct hammer2_trans {
 543         TAILQ_ENTRY(hammer2_trans) entry;
 544         struct hammer2_pfsmount *pmp;
 545         hammer2_xid_t           sync_xid;
 546         hammer2_tid_t           inode_tid;      /* inode number assignment */
 547         thread_t                td;             /* pointer */
 548         int                     flags;
 549         int                     blocked;
 550         uint8_t                 inodes_created;
 551         uint8_t                 dummy[7];
 552 };
 553
 554 typedef struct hammer2_trans hammer2_trans_t;
 555
 556 #define HAMMER2_TRANS_ISFLUSH           0x0001  /* formal flush */
 557 #define HAMMER2_TRANS_CONCURRENT        0x0002  /* concurrent w/flush */
 558 #define HAMMER2_TRANS_BUFCACHE          0x0004  /* from bioq strategy write */
 559 #define HAMMER2_TRANS_NEWINODE          0x0008  /* caller allocating inode */
 560 #define HAMMER2_TRANS_UNUSED0010        0x0010
 561 #define HAMMER2_TRANS_PREFLUSH          0x0020  /* preflush state */
 562
 563 #define HAMMER2_FREEMAP_HEUR_NRADIX     4       /* pwr 2 PBUFRADIX-MINIORADIX */
 564 #define HAMMER2_FREEMAP_HEUR_TYPES      8
 565 #define HAMMER2_FREEMAP_HEUR            (HAMMER2_FREEMAP_HEUR_NRADIX * \
 566                                          HAMMER2_FREEMAP_HEUR_TYPES)
 567
 568 #define HAMMER2_CLUSTER_COPY_NOCHAINS   0x0001  /* do not copy or ref chains */
 569 #define HAMMER2_CLUSTER_COPY_NOREF      0x0002  /* do not ref chains or cl */
 570
 571 /*
 572  * Transaction Rendezvous
 573  */
 574 TAILQ_HEAD(hammer2_trans_queue, hammer2_trans);
 575
 576 struct hammer2_trans_manage {
 577         hammer2_xid_t           flush_xid;      /* last flush transaction */
 578         hammer2_xid_t           alloc_xid;
 579         struct lock             translk;        /* lockmgr lock */
 580         struct hammer2_trans_queue transq;      /* modifying transactions */
 581         int                     flushcnt;       /* track flush trans */
 582 };
 583
 584 typedef struct hammer2_trans_manage hammer2_trans_manage_t;
 585
 586 /*
 587  * Global (per device) mount structure for device (aka vp->v_mount->hmp)
 588  */
 589 struct hammer2_mount {
 590         struct vnode    *devvp;         /* device vnode */
 591         int             ronly;          /* read-only mount */
 592         int             pmp_count;      /* PFS mounts backed by us */
 593         TAILQ_ENTRY(hammer2_mount) mntentry; /* hammer2_mntlist */
 594
 595         struct malloc_type *mchain;
 596         int             nipstacks;
 597         int             maxipstacks;
 598         kdmsg_iocom_t   iocom;          /* volume-level dmsg interface */
 599         struct spinlock io_spin;        /* iotree access */
 600         struct hammer2_io_tree iotree;
 601         int             iofree_count;
 602         hammer2_chain_t vchain;         /* anchor chain (topology) */
 603         hammer2_chain_t fchain;         /* anchor chain (freemap) */
 604         struct spinlock list_spin;
 605         struct h2_flush_list    flushq; /* flush seeds */
 606         struct hammer2_pfsmount *spmp;  /* super-root pmp for transactions */
 607         struct lock     vollk;          /* lockmgr lock */
 608         hammer2_off_t   heur_freemap[HAMMER2_FREEMAP_HEUR];
 609         int             volhdrno;       /* last volhdrno written */
 610         hammer2_volume_data_t voldata;
 611         hammer2_volume_data_t volsync;  /* synchronized voldata */
 612 };
 613
 614 typedef struct hammer2_mount hammer2_mount_t;
 615
 616 /*
 617  * HAMMER2 PFS mount point structure (aka vp->v_mount->mnt_data).
 618  * This has a 1:1 correspondence to struct mount (note that the
 619  * hammer2_mount structure has a N:1 correspondence).
 620  *
 621  * This structure represents a cluster mount and not necessarily a
 622  * PFS under a specific device mount (HMP).  The distinction is important
 623  * because the elements backing a cluster mount can change on the fly.
 624  *
 625  * Usually the first element under the cluster represents the original
 626  * user-requested mount that bootstraps the whole mess.  In significant
 627  * setups the original is usually just a read-only media image (or
 628  * representitive file) that simply contains a bootstrap volume header
 629  * listing the configuration.
 630  */
 631 struct hammer2_pfsmount {
 632         struct mount            *mp;
 633         TAILQ_ENTRY(hammer2_pfsmount) mntentry; /* hammer2_pfslist */
 634         uuid_t                  pfs_clid;
 635         uuid_t                  pfs_fsid;
 636         hammer2_mount_t         *spmp_hmp;      /* (spmp only) */
 637         hammer2_inode_t         *iroot;         /* PFS root inode */
 638         hammer2_inode_t         *ihidden;       /* PFS hidden directory */
 639         struct lock             lock;           /* PFS lock for certain ops */
 640         hammer2_off_t           inode_count;    /* copy of inode_count */
 641         ccms_domain_t           ccms_dom;
 642         struct netexport        export;         /* nfs export */
 643         int                     ronly;          /* read-only mount */
 644         struct malloc_type      *minode;
 645         struct malloc_type      *mmsg;
 646         struct spinlock         inum_spin;      /* inumber lookup */
 647         struct hammer2_inode_tree inum_tree;    /* (not applicable to spmp) */
 648         hammer2_tid_t           alloc_tid;
 649         hammer2_tid_t           flush_tid;
 650         hammer2_tid_t           inode_tid;
 651         long                    inmem_inodes;
 652         uint32_t                inmem_dirty_chains;
 653         int                     count_lwinprog; /* logical write in prog */
 654         struct spinlock         list_spin;
 655         struct h2_unlk_list     unlinkq;        /* last-close unlink */
 656         thread_t                wthread_td;     /* write thread td */
 657         struct bio_queue_head   wthread_bioq;   /* logical buffer bioq */
 658         struct mtx              wthread_mtx;    /* interlock */
 659         int                     wthread_destroy;/* termination sequencing */
 660 };
 661
 662 typedef struct hammer2_pfsmount hammer2_pfsmount_t;
 663
 664 #define HAMMER2_DIRTYCHAIN_WAITING      0x80000000
 665 #define HAMMER2_DIRTYCHAIN_MASK         0x7FFFFFFF
 666
 667 #define HAMMER2_LWINPROG_WAITING        0x80000000
 668 #define HAMMER2_LWINPROG_MASK           0x7FFFFFFF
 669
 670 /*
 671  * Bulkscan
 672  */
 673 #define HAMMER2_BULK_ABORT      0x00000001
 674
 675 /*
 676  * Misc
 677  */
 678 #if defined(_KERNEL)
 679
 680 MALLOC_DECLARE(M_HAMMER2);
 681
 682 #define VTOI(vp)        ((hammer2_inode_t *)(vp)->v_data)
 683 #define ITOV(ip)        ((ip)->vp)
 684
 685 /*
 686  * Currently locked chains retain the locked buffer cache buffer for
 687  * indirect blocks, and indirect blocks can be one of two sizes.  The
 688  * device buffer has to match the case to avoid deadlocking recursive
 689  * chains that might otherwise try to access different offsets within
 690  * the same device buffer.
 691  */
 692 static __inline
 693 int
 694 hammer2_devblkradix(int radix)
 695 {
 696 #if 0
 697         if (radix <= HAMMER2_LBUFRADIX) {
 698                 return (HAMMER2_LBUFRADIX);
 699         } else {
 700                 return (HAMMER2_PBUFRADIX);
 701         }
 702 #endif
 703         return (HAMMER2_PBUFRADIX);
 704 }
 705
 706 /*
 707  * XXX almost time to remove this.  DIO uses PBUFSIZE exclusively now.
 708  */
 709 static __inline
 710 size_t
 711 hammer2_devblksize(size_t bytes)
 712 {
 713 #if 0
 714         if (bytes <= HAMMER2_LBUFSIZE) {
 715                 return(HAMMER2_LBUFSIZE);
 716         } else {
 717                 KKASSERT(bytes <= HAMMER2_PBUFSIZE &&
 718                          (bytes ^ (bytes - 1)) == ((bytes << 1) - 1));
 719                 return (HAMMER2_PBUFSIZE);
 720         }
 721 #endif
 722         return (HAMMER2_PBUFSIZE);
 723 }
 724
 725
 726 static __inline
 727 hammer2_pfsmount_t *
 728 MPTOPMP(struct mount *mp)
 729 {
 730         return ((hammer2_pfsmount_t *)mp->mnt_data);
 731 }
 732
 733 #define LOCKSTART       int __nlocks = curthread->td_locks
 734 #define LOCKENTER       (++curthread->td_locks)
 735 #define LOCKEXIT        (--curthread->td_locks)
 736 #define LOCKSTOP        KKASSERT(curthread->td_locks == __nlocks)
 737
 738 extern struct vop_ops hammer2_vnode_vops;
 739 extern struct vop_ops hammer2_spec_vops;
 740 extern struct vop_ops hammer2_fifo_vops;
 741
 742 extern int hammer2_debug;
 743 extern int hammer2_cluster_enable;
 744 extern int hammer2_hardlink_enable;
 745 extern int hammer2_flush_pipe;
 746 extern int hammer2_synchronous_flush;
 747 extern int hammer2_dio_count;
 748 extern long hammer2_limit_dirty_chains;
 749 extern long hammer2_iod_file_read;
 750 extern long hammer2_iod_meta_read;
 751 extern long hammer2_iod_indr_read;
 752 extern long hammer2_iod_fmap_read;
 753 extern long hammer2_iod_volu_read;
 754 extern long hammer2_iod_file_write;
 755 extern long hammer2_iod_meta_write;
 756 extern long hammer2_iod_indr_write;
 757 extern long hammer2_iod_fmap_write;
 758 extern long hammer2_iod_volu_write;
 759 extern long hammer2_ioa_file_read;
 760 extern long hammer2_ioa_meta_read;
 761 extern long hammer2_ioa_indr_read;
 762 extern long hammer2_ioa_fmap_read;
 763 extern long hammer2_ioa_volu_read;
 764 extern long hammer2_ioa_file_write;
 765 extern long hammer2_ioa_meta_write;
 766 extern long hammer2_ioa_indr_write;
 767 extern long hammer2_ioa_fmap_write;
 768 extern long hammer2_ioa_volu_write;
 769
 770 extern struct objcache *cache_buffer_read;
 771 extern struct objcache *cache_buffer_write;
 772
 773 extern int destroy;
 774 extern int write_thread_wakeup;
 775
 776 extern mtx_t thread_protect;
 777
 778 /*
 779  * hammer2_subr.c
 780  */
 781 #define hammer2_icrc32(buf, size)       iscsi_crc32((buf), (size))
 782 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc))
 783
 784 int hammer2_signal_check(time_t *timep);
 785 hammer2_cluster_t *hammer2_inode_lock_ex(hammer2_inode_t *ip);
 786 hammer2_cluster_t *hammer2_inode_lock_nex(hammer2_inode_t *ip, int how);
 787 hammer2_cluster_t *hammer2_inode_lock_sh(hammer2_inode_t *ip);
 788 void hammer2_inode_unlock_ex(hammer2_inode_t *ip, hammer2_cluster_t *chain);
 789 void hammer2_inode_unlock_sh(hammer2_inode_t *ip, hammer2_cluster_t *chain);
 790 ccms_state_t hammer2_inode_lock_temp_release(hammer2_inode_t *ip);
 791 void hammer2_inode_lock_temp_restore(hammer2_inode_t *ip, ccms_state_t ostate);
 792 ccms_state_t hammer2_inode_lock_upgrade(hammer2_inode_t *ip);
 793 void hammer2_inode_lock_downgrade(hammer2_inode_t *ip, ccms_state_t ostate);
 794
 795 void hammer2_mount_exlock(hammer2_mount_t *hmp);
 796 void hammer2_mount_shlock(hammer2_mount_t *hmp);
 797 void hammer2_mount_unlock(hammer2_mount_t *hmp);
 798
 799 int hammer2_get_dtype(const hammer2_inode_data_t *ipdata);
 800 int hammer2_get_vtype(const hammer2_inode_data_t *ipdata);
 801 u_int8_t hammer2_get_obj_type(enum vtype vtype);
 802 void hammer2_time_to_timespec(u_int64_t xtime, struct timespec *ts);
 803 u_int64_t hammer2_timespec_to_time(const struct timespec *ts);
 804 u_int32_t hammer2_to_unix_xid(const uuid_t *uuid);
 805 void hammer2_guid_to_uuid(uuid_t *uuid, u_int32_t guid);
 806 hammer2_xid_t hammer2_trans_newxid(hammer2_pfsmount_t *pmp);
 807 void hammer2_trans_manage_init(void);
 808
 809 hammer2_key_t hammer2_dirhash(const unsigned char *name, size_t len);
 810 int hammer2_getradix(size_t bytes);
 811
 812 int hammer2_calc_logical(hammer2_inode_t *ip, hammer2_off_t uoff,
 813                         hammer2_key_t *lbasep, hammer2_key_t *leofp);
 814 int hammer2_calc_physical(hammer2_inode_t *ip,
 815                         const hammer2_inode_data_t *ipdata,
 816                         hammer2_key_t lbase);
 817 void hammer2_update_time(uint64_t *timep);
 818 void hammer2_adjreadcounter(hammer2_blockref_t *bref, size_t bytes);
 819
 820 /*
 821  * hammer2_inode.c
 822  */
 823 struct vnode *hammer2_igetv(hammer2_inode_t *ip, hammer2_cluster_t *cparent,
 824                         int *errorp);
 825 void hammer2_inode_lock_nlinks(hammer2_inode_t *ip);
 826 void hammer2_inode_unlock_nlinks(hammer2_inode_t *ip);
 827 hammer2_inode_t *hammer2_inode_lookup(hammer2_pfsmount_t *pmp,
 828                         hammer2_tid_t inum);
 829 hammer2_inode_t *hammer2_inode_get(hammer2_pfsmount_t *pmp,
 830                         hammer2_inode_t *dip, hammer2_cluster_t *cluster);
 831 void hammer2_inode_free(hammer2_inode_t *ip);
 832 void hammer2_inode_ref(hammer2_inode_t *ip);
 833 void hammer2_inode_drop(hammer2_inode_t *ip);
 834 void hammer2_inode_repoint(hammer2_inode_t *ip, hammer2_inode_t *pip,
 835                         hammer2_cluster_t *cluster);
 836 void hammer2_run_unlinkq(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp);
 837
 838 hammer2_inode_t *hammer2_inode_create(hammer2_trans_t *trans,
 839                         hammer2_inode_t *dip,
 840                         struct vattr *vap, struct ucred *cred,
 841                         const uint8_t *name, size_t name_len,
 842                         hammer2_cluster_t **clusterp, int *errorp);
 843 int hammer2_inode_connect(hammer2_trans_t *trans,
 844                         hammer2_cluster_t **clusterp, int hlink,
 845                         hammer2_inode_t *dip, hammer2_cluster_t *dcluster,
 846                         const uint8_t *name, size_t name_len,
 847                         hammer2_key_t key);
 848 hammer2_inode_t *hammer2_inode_common_parent(hammer2_inode_t *fdip,
 849                         hammer2_inode_t *tdip);
 850 void hammer2_inode_fsync(hammer2_trans_t *trans, hammer2_inode_t *ip,
 851                         hammer2_cluster_t *cparent);
 852 int hammer2_unlink_file(hammer2_trans_t *trans, hammer2_inode_t *dip,
 853                         const uint8_t *name, size_t name_len, int isdir,
 854                         int *hlinkp, struct nchandle *nch, int nlinks);
 855 int hammer2_hardlink_consolidate(hammer2_trans_t *trans,
 856                         hammer2_inode_t *ip, hammer2_cluster_t **clusterp,
 857                         hammer2_inode_t *cdip, hammer2_cluster_t *cdcluster,
 858                         int nlinks);
 859 int hammer2_hardlink_deconsolidate(hammer2_trans_t *trans, hammer2_inode_t *dip,
 860                         hammer2_chain_t **chainp, hammer2_chain_t **ochainp);
 861 int hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_cluster_t **cparentp,
 862                         hammer2_cluster_t *cluster);
 863 int hammer2_parent_find(hammer2_cluster_t **cparentp,
 864                         hammer2_cluster_t *cluster);
 865 void hammer2_inode_install_hidden(hammer2_pfsmount_t *pmp);
 866
 867 /*
 868  * hammer2_chain.c
 869  */
 870 void hammer2_voldata_lock(hammer2_mount_t *hmp);
 871 void hammer2_voldata_unlock(hammer2_mount_t *hmp);
 872 void hammer2_voldata_modify(hammer2_mount_t *hmp);
 873 hammer2_chain_t *hammer2_chain_alloc(hammer2_mount_t *hmp,
 874                                 hammer2_pfsmount_t *pmp,
 875                                 hammer2_trans_t *trans,
 876                                 hammer2_blockref_t *bref);
 877 void hammer2_chain_core_alloc(hammer2_trans_t *trans, hammer2_chain_t *chain);
 878 void hammer2_chain_ref(hammer2_chain_t *chain);
 879 void hammer2_chain_drop(hammer2_chain_t *chain);
 880 int hammer2_chain_lock(hammer2_chain_t *chain, int how);
 881 const hammer2_media_data_t *hammer2_chain_rdata(hammer2_chain_t *chain);
 882 hammer2_media_data_t *hammer2_chain_wdata(hammer2_chain_t *chain);
 883
 884 /*
 885  * hammer2_cluster.c
 886  */
 887 int hammer2_cluster_isunlinked(hammer2_cluster_t *cluster);
 888 void hammer2_cluster_load_async(hammer2_cluster_t *cluster,
 889                                 void (*callback)(hammer2_iocb_t *iocb),
 890                                 void *ptr);
 891 void hammer2_chain_moved(hammer2_chain_t *chain);
 892 void hammer2_chain_modify(hammer2_trans_t *trans,
 893                                 hammer2_chain_t *chain, int flags);
 894 void hammer2_chain_resize(hammer2_trans_t *trans, hammer2_inode_t *ip,
 895                                 hammer2_chain_t *parent,
 896                                 hammer2_chain_t *chain,
 897                                 int nradix, int flags);
 898 void hammer2_chain_unlock(hammer2_chain_t *chain);
 899 void hammer2_chain_wait(hammer2_chain_t *chain);
 900 hammer2_chain_t *hammer2_chain_get(hammer2_chain_t *parent, int generation,
 901                                 hammer2_blockref_t *bref);
 902 hammer2_chain_t *hammer2_chain_lookup_init(hammer2_chain_t *parent, int flags);
 903 void hammer2_chain_lookup_done(hammer2_chain_t *parent);
 904 hammer2_chain_t *hammer2_chain_lookup(hammer2_chain_t **parentp,
 905                                 hammer2_key_t *key_nextp,
 906                                 hammer2_key_t key_beg, hammer2_key_t key_end,
 907                                 int *cache_indexp, int flags, int *ddflagp);
 908 hammer2_chain_t *hammer2_chain_next(hammer2_chain_t **parentp,
 909                                 hammer2_chain_t *chain,
 910                                 hammer2_key_t *key_nextp,
 911                                 hammer2_key_t key_beg, hammer2_key_t key_end,
 912                                 int *cache_indexp, int flags);
 913 hammer2_chain_t *hammer2_chain_scan(hammer2_chain_t *parent,
 914                                 hammer2_chain_t *chain,
 915                                 int *cache_indexp, int flags);
 916
 917 int hammer2_chain_create(hammer2_trans_t *trans, hammer2_chain_t **parentp,
 918                                 hammer2_chain_t **chainp,
 919                                 hammer2_pfsmount_t *pmp,
 920                                 hammer2_key_t key, int keybits,
 921                                 int type, size_t bytes, int flags);
 922 void hammer2_chain_rename(hammer2_trans_t *trans, hammer2_blockref_t *bref,
 923                                 hammer2_chain_t **parentp,
 924                                 hammer2_chain_t *chain, int flags);
 925 int hammer2_chain_snapshot(hammer2_trans_t *trans, hammer2_chain_t **chainp,
 926                                 hammer2_ioc_pfs_t *pfs);
 927 void hammer2_chain_delete(hammer2_trans_t *trans, hammer2_chain_t *parent,
 928                                 hammer2_chain_t *chain, int flags);
 929 void hammer2_chain_delete_duplicate(hammer2_trans_t *trans,
 930                                 hammer2_chain_t **chainp, int flags);
 931 void hammer2_flush(hammer2_trans_t *trans, hammer2_chain_t *chain);
 932 void hammer2_chain_commit(hammer2_trans_t *trans, hammer2_chain_t *chain);
 933 void hammer2_chain_setflush(hammer2_trans_t *trans, hammer2_chain_t *chain);
 934 void hammer2_chain_countbrefs(hammer2_chain_t *chain,
 935                                 hammer2_blockref_t *base, int count);
 936
 937 void hammer2_chain_setcheck(hammer2_chain_t *chain, void *bdata);
 938 int hammer2_chain_testcheck(hammer2_chain_t *chain, void *bdata);
 939
 940
 941 void hammer2_pfs_memory_wait(hammer2_pfsmount_t *pmp);
 942 void hammer2_pfs_memory_inc(hammer2_pfsmount_t *pmp);
 943 void hammer2_pfs_memory_wakeup(hammer2_pfsmount_t *pmp);
 944
 945 void hammer2_base_delete(hammer2_trans_t *trans, hammer2_chain_t *chain,
 946                                 hammer2_blockref_t *base, int count,
 947                                 int *cache_indexp, hammer2_chain_t *child);
 948 void hammer2_base_insert(hammer2_trans_t *trans, hammer2_chain_t *chain,
 949                                 hammer2_blockref_t *base, int count,
 950                                 int *cache_indexp, hammer2_chain_t *child);
 951
 952 /*
 953  * hammer2_trans.c
 954  */
 955 void hammer2_trans_init(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp,
 956                                 int flags);
 957 void hammer2_trans_spmp(hammer2_trans_t *trans, hammer2_pfsmount_t *pmp);
 958 void hammer2_trans_done(hammer2_trans_t *trans);
 959
 960 /*
 961  * hammer2_ioctl.c
 962  */
 963 int hammer2_ioctl(hammer2_inode_t *ip, u_long com, void *data,
 964                                 int fflag, struct ucred *cred);
 965
 966 /*
 967  * hammer2_io.c
 968  */
 969 void hammer2_io_putblk(hammer2_io_t **diop);
 970 void hammer2_io_cleanup(hammer2_mount_t *hmp, struct hammer2_io_tree *tree);
 971 char *hammer2_io_data(hammer2_io_t *dio, off_t lbase);
 972 void hammer2_io_getblk(hammer2_mount_t *hmp, off_t lbase, int lsize,
 973                                 hammer2_iocb_t *iocb);
 974 void hammer2_io_complete(hammer2_iocb_t *iocb);
 975 void hammer2_io_callback(struct bio *bio);
 976 void hammer2_iocb_wait(hammer2_iocb_t *iocb);
 977 int hammer2_io_new(hammer2_mount_t *hmp, off_t lbase, int lsize,
 978                                 hammer2_io_t **diop);
 979 int hammer2_io_newnz(hammer2_mount_t *hmp, off_t lbase, int lsize,
 980                                 hammer2_io_t **diop);
 981 int hammer2_io_newq(hammer2_mount_t *hmp, off_t lbase, int lsize,
 982                                 hammer2_io_t **diop);
 983 int hammer2_io_bread(hammer2_mount_t *hmp, off_t lbase, int lsize,
 984                                 hammer2_io_t **diop);
 985 void hammer2_io_bawrite(hammer2_io_t **diop);
 986 void hammer2_io_bdwrite(hammer2_io_t **diop);
 987 int hammer2_io_bwrite(hammer2_io_t **diop);
 988 int hammer2_io_isdirty(hammer2_io_t *dio);
 989 void hammer2_io_setdirty(hammer2_io_t *dio);
 990 void hammer2_io_setinval(hammer2_io_t *dio, u_int bytes);
 991 void hammer2_io_brelse(hammer2_io_t **diop);
 992 void hammer2_io_bqrelse(hammer2_io_t **diop);
 993
 994 /*
 995  * hammer2_msgops.c
 996  */
 997 int hammer2_msg_dbg_rcvmsg(kdmsg_msg_t *msg);
 998 int hammer2_msg_adhoc_input(kdmsg_msg_t *msg);
 999
1000 /*
1001  * hammer2_vfsops.c
1002  */
1003 void hammer2_clusterctl_wakeup(kdmsg_iocom_t *iocom);
1004 void hammer2_volconf_update(hammer2_mount_t *hmp, int index);
1005 void hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx);
1006 void hammer2_bioq_sync(hammer2_pfsmount_t *pmp);
1007 int hammer2_vfs_sync(struct mount *mp, int waitflags);
1008 void hammer2_lwinprog_ref(hammer2_pfsmount_t *pmp);
1009 void hammer2_lwinprog_drop(hammer2_pfsmount_t *pmp);
1010 void hammer2_lwinprog_wait(hammer2_pfsmount_t *pmp);
1011
1012 /*
1013  * hammer2_freemap.c
1014  */
1015 int hammer2_freemap_alloc(hammer2_trans_t *trans, hammer2_chain_t *chain,
1016                                 size_t bytes);
1017 void hammer2_freemap_adjust(hammer2_trans_t *trans, hammer2_mount_t *hmp,
1018                                 hammer2_blockref_t *bref, int how);
1019
1020 /*
1021  * hammer2_cluster.c
1022  */
1023 int hammer2_cluster_need_resize(hammer2_cluster_t *cluster, int bytes);
1024 uint8_t hammer2_cluster_type(hammer2_cluster_t *cluster);
1025 const hammer2_media_data_t *hammer2_cluster_rdata(hammer2_cluster_t *cluster);
1026 hammer2_media_data_t *hammer2_cluster_wdata(hammer2_cluster_t *cluster);
1027 hammer2_cluster_t *hammer2_cluster_from_chain(hammer2_chain_t *chain);
1028 int hammer2_cluster_modified(hammer2_cluster_t *cluster);
1029 int hammer2_cluster_duplicated(hammer2_cluster_t *cluster);
1030 void hammer2_cluster_set_chainflags(hammer2_cluster_t *cluster, uint32_t flags);
1031 void hammer2_cluster_clr_chainflags(hammer2_cluster_t *cluster, uint32_t flags);
1032 void hammer2_cluster_bref(hammer2_cluster_t *cluster, hammer2_blockref_t *bref);
1033 void hammer2_cluster_setflush(hammer2_trans_t *trans,
1034                         hammer2_cluster_t *cluster);
1035 void hammer2_cluster_setmethod_check(hammer2_trans_t *trans,
1036                         hammer2_cluster_t *cluster, int check_algo);
1037 hammer2_cluster_t *hammer2_cluster_alloc(hammer2_pfsmount_t *pmp,
1038                         hammer2_trans_t *trans,
1039                         hammer2_blockref_t *bref);
1040 void hammer2_cluster_ref(hammer2_cluster_t *cluster);
1041 void hammer2_cluster_drop(hammer2_cluster_t *cluster);
1042 void hammer2_cluster_wait(hammer2_cluster_t *cluster);
1043 int hammer2_cluster_lock(hammer2_cluster_t *cluster, int how);
1044 void hammer2_cluster_replace(hammer2_cluster_t *dst, hammer2_cluster_t *src);
1045 void hammer2_cluster_replace_locked(hammer2_cluster_t *dst,
1046                         hammer2_cluster_t *src);
1047 hammer2_cluster_t *hammer2_cluster_copy(hammer2_cluster_t *ocluster,
1048                         int with_chains);
1049 void hammer2_cluster_unlock(hammer2_cluster_t *cluster);
1050 void hammer2_cluster_resize(hammer2_trans_t *trans, hammer2_inode_t *ip,
1051                         hammer2_cluster_t *cparent, hammer2_cluster_t *cluster,
1052                         int nradix, int flags);
1053 hammer2_inode_data_t *hammer2_cluster_modify_ip(hammer2_trans_t *trans,
1054                         hammer2_inode_t *ip, hammer2_cluster_t *cluster,
1055                         int flags);
1056 void hammer2_cluster_modify(hammer2_trans_t *trans, hammer2_cluster_t *cluster,
1057                         int flags);
1058 void hammer2_cluster_modsync(hammer2_cluster_t *cluster);
1059 hammer2_cluster_t *hammer2_cluster_lookup_init(hammer2_cluster_t *cparent,
1060                         int flags);
1061 void hammer2_cluster_lookup_done(hammer2_cluster_t *cparent);
1062 hammer2_cluster_t *hammer2_cluster_lookup(hammer2_cluster_t *cparent,
1063                         hammer2_key_t *key_nextp,
1064                         hammer2_key_t key_beg, hammer2_key_t key_end,
1065                         int flags, int *ddflagp);
1066 hammer2_cluster_t *hammer2_cluster_next(hammer2_cluster_t *cparent,
1067                         hammer2_cluster_t *cluster,
1068                         hammer2_key_t *key_nextp,
1069                         hammer2_key_t key_beg, hammer2_key_t key_end,
1070                         int flags);
1071 hammer2_cluster_t *hammer2_cluster_scan(hammer2_cluster_t *cparent,
1072                         hammer2_cluster_t *cluster, int flags);
1073 int hammer2_cluster_create(hammer2_trans_t *trans, hammer2_cluster_t *cparent,
1074                         hammer2_cluster_t **clusterp,
1075                         hammer2_key_t key, int keybits,
1076                         int type, size_t bytes, int flags);
1077 void hammer2_cluster_rename(hammer2_trans_t *trans, hammer2_blockref_t *bref,
1078                         hammer2_cluster_t *cparent, hammer2_cluster_t *cluster,
1079                         int flags);
1080 void hammer2_cluster_delete(hammer2_trans_t *trans, hammer2_cluster_t *pcluster,
1081                         hammer2_cluster_t *cluster, int flags);
1082 int hammer2_cluster_snapshot(hammer2_trans_t *trans,
1083                         hammer2_cluster_t *ocluster, hammer2_ioc_pfs_t *pfs);
1084 hammer2_cluster_t *hammer2_cluster_parent(hammer2_cluster_t *cluster);
1085
1086 int hammer2_bulk_scan(hammer2_trans_t *trans, hammer2_chain_t *parent,
1087                         int (*func)(hammer2_chain_t *chain, void *info),
1088                         void *info);
1089 int hammer2_bulkfree_pass(hammer2_mount_t *hmp,
1090                         struct hammer2_ioc_bulkfree *bfi);
1091
1092 /*
1093  * hammer2_iocom.c
1094  */
1095 void hammer2_iocom_init(hammer2_mount_t *hmp);
1096 void hammer2_iocom_uninit(hammer2_mount_t *hmp);
1097 void hammer2_cluster_reconnect(hammer2_mount_t *hmp, struct file *fp);
1098
1099 #endif /* !_KERNEL */
1100 #endif /* !_VFS_HAMMER2_HAMMER2_H_ */