The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/buf.h

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    1 /*
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)buf.h       8.9 (Berkeley) 3/30/95
   39  * $FreeBSD: src/sys/sys/buf.h,v 1.88.2.10 2003/01/25 19:02:23 dillon Exp $
   40  * $DragonFly: src/sys/sys/buf.h,v 1.54 2008/08/29 20:08:37 dillon Exp $
   41  */
   42 
   43 #ifndef _SYS_BUF_H_
   44 #define _SYS_BUF_H_
   45 
   46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   47 
   48 #ifndef _SYS_QUEUE_H_
   49 #include <sys/queue.h>
   50 #endif
   51 #ifndef _SYS_LOCK_H_
   52 #include <sys/lock.h>
   53 #endif
   54 #ifndef _SYS_DEVICE_H_
   55 #include <sys/device.h>
   56 #endif
   57 
   58 #ifndef _SYS_XIO_H_
   59 #include <sys/xio.h>
   60 #endif
   61 #ifndef _SYS_TREE_H_
   62 #include <sys/tree.h>
   63 #endif
   64 #ifndef _SYS_BIO_H_
   65 #include <sys/bio.h>
   66 #endif
   67 #ifndef _SYS_SPINLOCK_H_
   68 #include <sys/spinlock.h>
   69 #endif
   70 
   71 struct buf;
   72 struct bio;
   73 struct mount;
   74 struct vnode;
   75 struct xio;
   76 
   77 #define NBUF_BIO        6
   78 
   79 struct buf_rb_tree;
   80 struct buf_rb_hash;
   81 RB_PROTOTYPE2(buf_rb_tree, buf, b_rbnode, rb_buf_compare, off_t);
   82 RB_PROTOTYPE2(buf_rb_hash, buf, b_rbhash, rb_buf_compare, off_t);
   83 
   84 /*
   85  * To avoid including <ufs/ffs/softdep.h> 
   86  */   
   87 LIST_HEAD(workhead, worklist);
   88 
   89 #endif
   90 
   91 typedef enum buf_cmd {
   92         BUF_CMD_DONE = 0,
   93         BUF_CMD_READ,
   94         BUF_CMD_WRITE,
   95         BUF_CMD_FREEBLKS,
   96         BUF_CMD_FORMAT,
   97         BUF_CMD_FLUSH
   98 } buf_cmd_t;
   99 
  100 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  101 
  102 /*
  103  * The buffer header describes an I/O operation in the kernel.
  104  *
  105  * NOTES:
  106  *      b_bufsize represents the filesystem block size (for this particular
  107  *      block) and/or the allocation size or original request size.  This
  108  *      field is NOT USED by lower device layers.  VNode and device
  109  *      strategy routines WILL NEVER ACCESS THIS FIELD.
  110  *
  111  *      b_bcount represents the I/O request size.  Unless B_NOBCLIP is set,
  112  *      the device chain is allowed to clip b_bcount to accomodate the device
  113  *      EOF.  Note that this is different from the byte oriented file EOF.
  114  *      If B_NOBCLIP is set, the device chain is required to generate an
  115  *      error if it would othrewise have to clip the request.  Buffers 
  116  *      obtained via getblk() automatically set B_NOBCLIP.  It is important
  117  *      to note that EOF clipping via b_bcount is different from EOF clipping
  118  *      via returning a b_actual < b_bcount.  B_NOBCLIP only effects block
  119  *      oriented EOF clipping (b_bcount modifications).
  120  *
  121  *      b_actual represents the number of bytes of I/O that actually occured,
  122  *      whether an error occured or not.  b_actual must be initialized to 0
  123  *      prior to initiating I/O as the device drivers will assume it to
  124  *      start at 0.
  125  *
  126  *      b_dirtyoff, b_dirtyend.  Buffers support piecemeal, unaligned
  127  *      ranges of dirty data that need to be written to backing store.
  128  *      The range is typically clipped at b_bcount (not b_bufsize).
  129  *
  130  *      b_bio1 and b_bio2 represent the two primary I/O layers.  Additional
  131  *      I/O layers are allocated out of the object cache and may also exist.
  132  *
  133  *      b_bio1 is the logical layer and contains offset or block number 
  134  *      data for the primary vnode, b_vp.  I/O operations are almost
  135  *      universally initiated from the logical layer, so you will often
  136  *      see things like:  vn_strategy(bp->b_vp, &bp->b_bio1).
  137  *
  138  *      b_bio2 is the first physical layer (typically the slice-relative
  139  *      layer) and contains the translated offset or block number for
  140  *      the block device underlying a filesystem.   Filesystems such as UFS
  141  *      will maintain cached translations and you may see them initiate
  142  *      a 'physical' I/O using vn_strategy(devvp, &bp->b_bio2).  BUT, 
  143  *      remember that the layering is relative to bp->b_vp, so the
  144  *      device-relative block numbers for buffer cache operations that occur
  145  *      directly on a block device will be in the first BIO layer.
  146  *
  147  *      b_ops - initialized if a buffer has a bio_ops
  148  *
  149  *      NOTE!!! Only the BIO subsystem accesses b_bio1 and b_bio2 directly.
  150  *      ALL STRATEGY LAYERS FOR BOTH VNODES AND DEVICES ONLY ACCESS THE BIO
  151  *      PASSED TO THEM, AND WILL PUSH ANOTHER BIO LAYER IF FORWARDING THE
  152  *      I/O DEEPER.  In particular, a vn_strategy() or dev_dstrategy()
  153  *      call should not ever access buf->b_vp as this vnode may be totally
  154  *      unrelated to the vnode/device whos strategy routine was called.
  155  */
  156 struct buf {
  157         RB_ENTRY(buf) b_rbnode;         /* RB node in vnode clean/dirty tree */
  158         RB_ENTRY(buf) b_rbhash;         /* RB node in vnode hash tree */
  159         TAILQ_ENTRY(buf) b_freelist;    /* Free list position if not active. */
  160         struct buf *b_cluster_next;     /* Next buffer (cluster code) */
  161         struct vnode *b_vp;             /* (vp, loffset) index */
  162         struct bio b_bio_array[NBUF_BIO]; /* BIO translation layers */ 
  163         u_int32_t b_flags;              /* B_* flags. */
  164         unsigned int b_qindex;          /* buffer queue index */
  165         unsigned int b_qcpu;            /* buffer queue cpu */
  166         unsigned char b_act_count;      /* similar to vm_page act_count */
  167         unsigned char b_unused01;
  168         struct lock b_lock;             /* Buffer lock */
  169         void    *b_iosched;             /* I/O scheduler priv data */
  170         buf_cmd_t b_cmd;                /* I/O command */
  171         int     b_bufsize;              /* Allocated buffer size. */
  172         int     b_runningbufspace;      /* when I/O is running, pipelining */
  173         int     b_bcount;               /* Valid bytes in buffer. */
  174         int     b_resid;                /* Remaining I/O */
  175         int     b_error;                /* Error return */
  176         caddr_t b_data;                 /* Memory, superblocks, indirect etc. */
  177         caddr_t b_kvabase;              /* base kva for buffer */
  178         int     b_kvasize;              /* size of kva for buffer */
  179         int     b_dirtyoff;             /* Offset in buffer of dirty region. */
  180         int     b_dirtyend;             /* Offset of end of dirty region. */
  181         int     b_refs;                 /* FINDBLK_REF/bqhold()/bqdrop() */
  182         struct  xio b_xio;              /* data buffer page list management */
  183         struct  bio_ops *b_ops;         /* bio_ops used w/ b_dep */
  184         struct  workhead b_dep;         /* List of filesystem dependencies. */
  185 };
  186 
  187 /*
  188  * XXX temporary
  189  */
  190 #define b_bio1          b_bio_array[0]  /* logical layer */
  191 #define b_bio2          b_bio_array[1]  /* (typically) the disk layer */
  192 #define b_loffset       b_bio1.bio_offset
  193 
  194 
  195 /*
  196  * Flags passed to getblk()
  197  *
  198  * GETBLK_PCATCH - Allow signals to be caught.  getblk() is allowed to return
  199  *                 NULL if this flag is passed.
  200  *
  201  * GETBLK_BHEAVY - This is a heavy weight buffer, meaning that resolving
  202  *                 writes can require additional buffers.
  203  *
  204  * GETBLK_SZMATCH- blksize must match pre-existing b_bcount.  getblk() can
  205  *                 return NULL.
  206  *
  207  * GETBLK_NOWAIT - Do not use a blocking lock.  getblk() can return NULL.
  208  */
  209 #define GETBLK_PCATCH   0x0001  /* catch signals */
  210 #define GETBLK_BHEAVY   0x0002  /* heavy weight buffer */
  211 #define GETBLK_SZMATCH  0x0004  /* pre-existing buffer must match */
  212 #define GETBLK_NOWAIT   0x0008  /* non-blocking */
  213 
  214 #define FINDBLK_TEST    0x0010  /* test only, do not lock */
  215 #define FINDBLK_NBLOCK  0x0020  /* use non-blocking lock, can return NULL */
  216 #define FINDBLK_REF     0x0040  /* ref the buf to prevent reuse */
  217 
  218 /*
  219  * These flags are kept in b_flags.
  220  *
  221  * Notes:
  222  *
  223  *      B_PAGING        Indicates that bp is being used by the paging system or
  224  *                      some paging system and that the bp is not linked into
  225  *                      the b_vp's clean/dirty linked lists or ref counts.
  226  *                      Buffer vp reassignments are illegal in this case.
  227  *
  228  *      B_CACHE         This may only be set if the buffer is entirely valid.
  229  *                      The situation where B_DELWRI is set and B_CACHE is
  230  *                      clear MUST be committed to disk by getblk() so 
  231  *                      B_DELWRI can also be cleared.  See the comments for
  232  *                      getblk() in kern/vfs_bio.c.  If B_CACHE is clear,
  233  *                      the caller is expected to clear B_ERROR|B_INVAL,
  234  *                      set BUF_CMD_READ, and initiate an I/O.
  235  *
  236  *                      The 'entire buffer' is defined to be the range from
  237  *                      0 through b_bcount.
  238  *
  239  *      B_MALLOC        Request that the buffer be allocated from the malloc
  240  *                      pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned.
  241  *
  242  *      B_CLUSTEROK     This flag is typically set for B_DELWRI buffers
  243  *                      by filesystems that allow clustering when the buffer
  244  *                      is fully dirty and indicates that it may be clustered
  245  *                      with other adjacent dirty buffers.  Note the clustering
  246  *                      may not be used with the stage 1 data write under NFS
  247  *                      but may be used for the commit rpc portion.
  248  *
  249  *      B_VMIO          Indicates that the buffer is tied into an VM object.
  250  *                      The buffer's data is always PAGE_SIZE aligned even
  251  *                      if b_bufsize and b_bcount are not.  ( b_bufsize is 
  252  *                      always at least DEV_BSIZE aligned, though ).
  253  *      
  254  *      B_DIRECT        Hint that we should attempt to completely free
  255  *                      the pages underlying the buffer.   B_DIRECT is 
  256  *                      sticky until the buffer is released and typically
  257  *                      only has an effect when B_RELBUF is also set.
  258  *
  259  *      B_LOCKED        The buffer will be released to the locked queue
  260  *                      regardless of its current state.  Note that
  261  *                      if B_DELWRI is set, no I/O occurs until the caller
  262  *                      acquires the buffer, clears B_LOCKED, then releases
  263  *                      it again.
  264  *
  265  *      B_AGE           When allocating a new buffer any buffer encountered
  266  *                      with B_AGE set will be reallocated more quickly then
  267  *                      buffers encountered without it set.  B_AGE is set
  268  *                      as part of the loop so idle buffers should eventually
  269  *                      wind up with B_AGE set.  B_AGE explicitly does NOT
  270  *                      cause the buffer to be instantly reallocated for
  271  *                      other purposes.
  272  *
  273  *                      Standard buffer flushing routines leave B_AGE intact
  274  *                      through the DIRTY queue and into the CLEAN queue.
  275  *                      Setting B_AGE on a dirty buffer will not cause it
  276  *                      to be flushed more quickly but will cause it to be
  277  *                      reallocated more quickly after having been flushed.
  278  *
  279  *      B_NOCACHE       Request that the buffer and backing store be
  280  *                      destroyed on completion.  If B_DELWRI is set and the
  281  *                      write fails, the buffer remains intact.
  282  *
  283  *      B_NOTMETA       May be set on block device buffers representing
  284  *                      file data (i.e. which aren't really meta-data),
  285  *                      which will cause the buffer cache to set PG_NOTMETA
  286  *                      in the VM pages when releasing them and the
  287  *                      swapcache to not try to cache them.
  288  *
  289  *      B_MARKER        Special marker buf, always skip.
  290  */
  291 
  292 #define B_AGE           0x00000001      /* Reuse more quickly */
  293 #define B_NEEDCOMMIT    0x00000002      /* Append-write in progress. */
  294 #define B_NOTMETA       0x00000004      /* This really isn't metadata */
  295 #define B_DIRECT        0x00000008      /* direct I/O flag (pls free vmio) */
  296 #define B_DEFERRED      0x00000010      /* vfs-controlled deferment */
  297 #define B_CACHE         0x00000020      /* Bread found us in the cache. */
  298 #define B_HASHED        0x00000040      /* Indexed via v_rbhash_tree */
  299 #define B_DELWRI        0x00000080      /* Delay I/O until buffer reused. */
  300 #define B_BNOCLIP       0x00000100      /* EOF clipping b_bcount not allowed */
  301 #define B_HASBOGUS      0x00000200      /* Contains bogus pages */
  302 #define B_EINTR         0x00000400      /* I/O was interrupted */
  303 #define B_ERROR         0x00000800      /* I/O error occurred. */
  304 #define B_IODEBUG       0x00001000      /* (Debugging only bread) */
  305 #define B_INVAL         0x00002000      /* Does not contain valid info. */
  306 #define B_LOCKED        0x00004000      /* Locked in core (not reusable). */
  307 #define B_NOCACHE       0x00008000      /* Destroy buffer AND backing store */
  308 #define B_MALLOC        0x00010000      /* malloced b_data */
  309 #define B_CLUSTEROK     0x00020000      /* Pagein op, so swap() can count it. */
  310 #define B_MARKER        0x00040000      /* Special marker buf in queue */
  311 #define B_RAW           0x00080000      /* Set by physio for raw transfers. */
  312 #define B_HEAVY         0x00100000      /* Heavy-weight buffer */
  313 #define B_DIRTY         0x00200000      /* Needs writing later. */
  314 #define B_RELBUF        0x00400000      /* Release VMIO buffer. */
  315 #define B_UNUSED23      0x00800000      /* Request wakeup on done */
  316 #define B_VNCLEAN       0x01000000      /* On vnode clean list */
  317 #define B_VNDIRTY       0x02000000      /* On vnode dirty list */
  318 #define B_PAGING        0x04000000      /* volatile paging I/O -- bypass VMIO */
  319 #define B_ORDERED       0x08000000      /* Must guarantee I/O ordering */
  320 #define B_RAM           0x10000000      /* Read ahead mark (flag) */
  321 #define B_VMIO          0x20000000      /* VMIO flag */
  322 #define B_CLUSTER       0x40000000      /* pagein op, so swap() can count it */
  323 #define B_VFSFLAG1      0x80000000      /* VFSs can set this flag */
  324 
  325 #define PRINT_BUF_FLAGS "\2"   \
  326         "\40unused31\37cluster\36vmio\35ram\34ordered" \
  327         "\33paging\32vndirty\31vnclean\30unused23\27relbuf\26dirty" \
  328         "\25unused20\24raw\23unused18\22clusterok\21malloc\20nocache" \
  329         "\17locked\16inval\15unused12\14error\13eintr\12unused9\11bnoclip" \
  330         "\10delwri\7hashed\6cache\5deferred\4direct\3unused2\2needcommit\1age"
  331 
  332 #define NOOFFSET        (-1LL)          /* No buffer offset calculated yet */
  333 
  334 #ifdef _KERNEL
  335 /*
  336  * Buffer locking.  See sys/buf2.h for inline functions.
  337  */
  338 extern char *buf_wmesg;                 /* Default buffer lock message */
  339 #define BUF_WMESG "bufwait"
  340 
  341 #endif /* _KERNEL */
  342 
  343 struct bio_queue_head {
  344         TAILQ_HEAD(bio_queue, bio) queue;
  345         off_t   off_unused;
  346         int     reorder;
  347         struct  bio *transition;
  348         struct  bio *bio_unused;
  349 };
  350 
  351 /*
  352  * This structure describes a clustered I/O.
  353  */
  354 struct cluster_save {
  355         int     bs_nchildren;           /* Number of associated buffers. */
  356         struct buf **bs_children;       /* List of associated buffers. */
  357 };
  358 
  359 /*
  360  * Zero out the buffer's data area.
  361  */
  362 #define clrbuf(bp) {                                                    \
  363         bzero((bp)->b_data, (u_int)(bp)->b_bcount);                     \
  364         (bp)->b_resid = 0;                                              \
  365 }
  366 
  367 /*
  368  * Flags to low-level bitmap allocation routines (balloc).
  369  *
  370  * Note: sequential_heuristic() in kern/vfs_vnops.c limits the count
  371  * to 127.
  372  */
  373 #define B_SEQMASK       0x7F000000      /* Sequential heuristic mask. */
  374 #define B_SEQSHIFT      24              /* Sequential heuristic shift. */
  375 #define B_SEQMAX        0x7F
  376 #define B_CLRBUF        0x01            /* Cleared invalid areas of buffer. */
  377 #define B_SYNC          0x02            /* Do all allocations synchronously. */
  378 
  379 #ifdef _KERNEL
  380 extern long     nbuf;                   /* The number of buffer headers */
  381 extern long     maxswzone;              /* Max KVA for swap structures */
  382 extern long     maxbcache;              /* Max KVA for buffer cache */
  383 extern long     hidirtybufspace;
  384 extern int      buf_maxio;              /* nominal maximum I/O for buffer */
  385 extern struct buf *buf;                 /* The buffer headers. */
  386 extern char     *buffers;               /* The buffer contents. */
  387 extern int      bufpages;               /* Number of memory pages in the buffer pool. */
  388 extern struct   buf *swbuf;             /* Swap I/O buffer headers. */
  389 extern long     nswbuf;                 /* Number of swap I/O buffer headers. */
  390 extern int      bioq_reorder_burst_interval;
  391 extern int      bioq_reorder_burst_bytes;
  392 extern int      bioq_reorder_minor_interval;
  393 extern int      bioq_reorder_minor_bytes;
  394 
  395 struct uio;
  396 struct devstat;
  397 
  398 long    bd_heatup (void);
  399 void    bd_wait (long count);
  400 void    waitrunningbufspace(void);
  401 int     buf_dirty_count_severe (void);
  402 int     buf_runningbufspace_severe (void);
  403 void    initbufbio(struct buf *);
  404 void    uninitbufbio(struct buf *);
  405 void    reinitbufbio(struct buf *);
  406 void    clearbiocache(struct bio *);
  407 void    bremfree (struct buf *);
  408 int     breadx (struct vnode *, off_t, int, struct buf **);
  409 int     breadnx (struct vnode *, off_t, int, off_t *, int *, int,
  410                 struct buf **);
  411 void    breadcb(struct vnode *, off_t, int,
  412                 void (*)(struct bio *), void *);
  413 int     bwrite (struct buf *);
  414 void    bdwrite (struct buf *);
  415 void    buwrite (struct buf *);
  416 void    bawrite (struct buf *);
  417 void    bdirty (struct buf *);
  418 void    bheavy (struct buf *);
  419 void    bundirty (struct buf *);
  420 int     bowrite (struct buf *);
  421 void    brelse (struct buf *);
  422 void    bqrelse (struct buf *);
  423 int     cluster_awrite (struct buf *);
  424 struct buf *getpbuf (int *);
  425 struct buf *getpbuf_kva (int *);
  426 int     inmem (struct vnode *, off_t);
  427 struct buf *findblk (struct vnode *, off_t, int);
  428 struct buf *getblk (struct vnode *, off_t, int, int, int);
  429 struct buf *getcacheblk (struct vnode *, off_t, int, int);
  430 struct buf *geteblk (int);
  431 struct buf *getnewbuf(int, int, int, int);
  432 void    bqhold(struct buf *bp);
  433 void    bqdrop(struct buf *bp);
  434 void    regetblk(struct buf *bp);
  435 struct bio *push_bio(struct bio *);
  436 struct bio *pop_bio(struct bio *);
  437 int     biowait (struct bio *, const char *);
  438 int     biowait_timeout (struct bio *, const char *, int);
  439 void    bpdone (struct buf *, int);
  440 void    biodone (struct bio *);
  441 void    biodone_sync (struct bio *);
  442 void    pbuf_adjcount(int *pfreecnt, int n);
  443 
  444 void    cluster_append(struct bio *, struct buf *);
  445 int     cluster_readx (struct vnode *, off_t, off_t, int,
  446             size_t, size_t, struct buf **);
  447 void    cluster_readcb (struct vnode *, off_t, off_t, int,
  448             size_t, size_t, void (*func)(struct bio *), void *arg);
  449 void    cluster_write (struct buf *, off_t, int, int);
  450 int     physread (struct dev_read_args *);
  451 int     physwrite (struct dev_write_args *);
  452 void    vfs_bio_clrbuf (struct buf *);
  453 void    vfs_busy_pages (struct vnode *, struct buf *);
  454 void    vfs_unbusy_pages (struct buf *);
  455 int     vmapbuf (struct buf *, caddr_t, int);
  456 void    vunmapbuf (struct buf *);
  457 void    relpbuf (struct buf *, int *);
  458 void    brelvp (struct buf *);
  459 int     bgetvp (struct vnode *, struct buf *, int);
  460 void    bsetrunningbufspace(struct buf *, int);
  461 int     allocbuf (struct buf *bp, int size);
  462 int     scan_all_buffers (int (*)(struct buf *, void *), void *);
  463 void    reassignbuf (struct buf *);
  464 struct  buf *trypbuf (int *);
  465 struct  buf *trypbuf_kva (int *);
  466 void    bio_ops_sync(struct mount *mp);
  467 void    vm_hold_free_pages(struct buf *bp, vm_offset_t from, vm_offset_t to);
  468 void    vm_hold_load_pages(struct buf *bp, vm_offset_t from, vm_offset_t to);
  469 void    nestiobuf_done(struct bio *mbio, int donebytes, int error, struct devstat *stats);
  470 void    nestiobuf_init(struct bio *mbio);
  471 void    nestiobuf_add(struct bio *mbio, struct buf *bp, int off, size_t size, struct devstat *stats);
  472 void    nestiobuf_start(struct bio *mbio);
  473 void    nestiobuf_error(struct bio *mbio, int error);
  474 #endif  /* _KERNEL */
  475 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
  476 #endif  /* !_SYS_BUF_H_ */

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