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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)buf.h       8.9 (Berkeley) 3/30/95
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _SYS_BUF_H_
   39 #define _SYS_BUF_H_
   40 
   41 #include <sys/queue.h>
   42 #include <sys/lock.h>
   43 #include <sys/lockmgr.h>
   44 
   45 struct bio;
   46 struct buf;
   47 struct mount;
   48 struct vnode;
   49 
   50 /*
   51  * To avoid including <ufs/ffs/softdep.h> 
   52  */   
   53 LIST_HEAD(workhead, worklist);
   54 /*
   55  * These are currently used only by the soft dependency code, hence
   56  * are stored once in a global variable. If other subsystems wanted
   57  * to use these hooks, a pointer to a set of bio_ops could be added
   58  * to each buffer.
   59  */
   60 extern struct bio_ops {
   61         int     (*io_prewrite)(struct vnode *, struct buf *);
   62         void    (*io_start)(struct buf *);
   63         void    (*io_complete)(struct buf *);
   64         void    (*io_deallocate)(struct buf *);
   65         void    (*io_movedeps)(struct buf *, struct buf *);
   66         int     (*io_countdeps)(struct buf *, int);
   67 } bioops;
   68 
   69 struct buf_ops {
   70         char    *bop_name;
   71         int     (*bop_write)(struct buf *);
   72 };
   73 
   74 extern struct buf_ops buf_ops_bio;
   75 
   76 struct vm_object;
   77 
   78 typedef unsigned char b_xflags_t;
   79 
   80 /*
   81  * The buffer header describes an I/O operation in the kernel.
   82  *
   83  * NOTES:
   84  *      b_bufsize, b_bcount.  b_bufsize is the allocation size of the
   85  *      buffer, either DEV_BSIZE or PAGE_SIZE aligned.  b_bcount is the
   86  *      originally requested buffer size and can serve as a bounds check
   87  *      against EOF.  For most, but not all uses, b_bcount == b_bufsize.
   88  *
   89  *      b_dirtyoff, b_dirtyend.  Buffers support piecemeal, unaligned
   90  *      ranges of dirty data that need to be written to backing store.
   91  *      The range is typically clipped at b_bcount ( not b_bufsize ).
   92  *
   93  *      b_resid.  Number of bytes remaining in I/O.  After an I/O operation
   94  *      completes, b_resid is usually 0 indicating 100% success.
   95  *
   96  *      All fields are protected by the buffer lock except those marked:
   97  *              V - Protected by owning vnode lock
   98  *              Q - Protected by the buf queue lock
   99  *              D - Protected by an dependency implementation specific lock
  100  */
  101 struct buf {
  102         struct bio b_io;                /* "Builtin" I/O request. */
  103 #define b_bcount        b_io.bio_bcount
  104 #define b_caller1       b_io.bio_caller1
  105 #define b_data          b_io.bio_data
  106 #define b_dev           b_io.bio_dev
  107 #define b_error         b_io.bio_error
  108 #define b_iocmd         b_io.bio_cmd
  109 #define b_ioflags       b_io.bio_flags
  110 #define b_iooffset      b_io.bio_offset
  111 #define b_resid         b_io.bio_resid
  112         struct buf_ops  *b_op;
  113         unsigned                b_magic;
  114 #define B_MAGIC_BIO     0x10b10b10
  115 #define B_MAGIC_NFS     0x67238234
  116         void    (*b_iodone)(struct buf *);
  117         daddr_t b_blkno;                /* Underlying physical block number. */
  118         off_t   b_offset;               /* Offset into file. */
  119         TAILQ_ENTRY(buf) b_vnbufs;      /* (V) Buffer's associated vnode. */
  120         struct buf      *b_left;        /* (V) splay tree link */
  121         struct buf      *b_right;       /* (V) splay tree link */
  122         uint32_t        b_vflags;       /* (V) BV_* flags */
  123         TAILQ_ENTRY(buf) b_freelist;    /* (Q) Free list position inactive. */
  124         unsigned short b_qindex;        /* (Q) buffer queue index */
  125         uint32_t        b_flags;        /* B_* flags. */
  126         b_xflags_t b_xflags;            /* extra flags */
  127         struct lock b_lock;             /* Buffer lock */
  128         long    b_bufsize;              /* Allocated buffer size. */
  129         long    b_runningbufspace;      /* when I/O is running, pipelining */
  130         caddr_t b_kvabase;              /* base kva for buffer */
  131         int     b_kvasize;              /* size of kva for buffer */
  132         daddr_t b_lblkno;               /* Logical block number. */
  133         struct  vnode *b_vp;            /* Device vnode. */
  134         struct  vm_object *b_object;    /* Object for vp */
  135         int     b_dirtyoff;             /* Offset in buffer of dirty region. */
  136         int     b_dirtyend;             /* Offset of end of dirty region. */
  137         struct  ucred *b_rcred;         /* Read credentials reference. */
  138         struct  ucred *b_wcred;         /* Write credentials reference. */
  139         void    *b_saveaddr;            /* Original b_addr for physio. */
  140         union   pager_info {
  141                 int     pg_reqpage;
  142         } b_pager;
  143         union   cluster_info {
  144                 TAILQ_HEAD(cluster_list_head, buf) cluster_head;
  145                 TAILQ_ENTRY(buf) cluster_entry;
  146         } b_cluster;
  147         struct  vm_page *b_pages[btoc(MAXPHYS)];
  148         int             b_npages;
  149         struct  workhead b_dep;         /* (D) List of filesystem dependencies. */
  150 };
  151 
  152 /*
  153  * These flags are kept in b_flags.
  154  *
  155  * Notes:
  156  *
  157  *      B_ASYNC         VOP calls on bp's are usually async whether or not
  158  *                      B_ASYNC is set, but some subsystems, such as NFS, like 
  159  *                      to know what is best for the caller so they can
  160  *                      optimize the I/O.
  161  *
  162  *      B_PAGING        Indicates that bp is being used by the paging system or
  163  *                      some paging system and that the bp is not linked into
  164  *                      the b_vp's clean/dirty linked lists or ref counts.
  165  *                      Buffer vp reassignments are illegal in this case.
  166  *
  167  *      B_CACHE         This may only be set if the buffer is entirely valid.
  168  *                      The situation where B_DELWRI is set and B_CACHE is
  169  *                      clear MUST be committed to disk by getblk() so 
  170  *                      B_DELWRI can also be cleared.  See the comments for
  171  *                      getblk() in kern/vfs_bio.c.  If B_CACHE is clear,
  172  *                      the caller is expected to clear BIO_ERROR and B_INVAL,
  173  *                      set BIO_READ, and initiate an I/O.
  174  *
  175  *                      The 'entire buffer' is defined to be the range from
  176  *                      0 through b_bcount.
  177  *
  178  *      B_MALLOC        Request that the buffer be allocated from the malloc
  179  *                      pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned.
  180  *
  181  *      B_CLUSTEROK     This flag is typically set for B_DELWRI buffers
  182  *                      by filesystems that allow clustering when the buffer
  183  *                      is fully dirty and indicates that it may be clustered
  184  *                      with other adjacent dirty buffers.  Note the clustering
  185  *                      may not be used with the stage 1 data write under NFS
  186  *                      but may be used for the commit rpc portion.
  187  *
  188  *      B_VMIO          Indicates that the buffer is tied into an VM object.
  189  *                      The buffer's data is always PAGE_SIZE aligned even
  190  *                      if b_bufsize and b_bcount are not.  ( b_bufsize is 
  191  *                      always at least DEV_BSIZE aligned, though ).
  192  *
  193  *      B_DIRECT        Hint that we should attempt to completely free
  194  *                      the pages underlying the buffer.  B_DIRECT is
  195  *                      sticky until the buffer is released and typically
  196  *                      only has an effect when B_RELBUF is also set.
  197  *
  198  */
  199 
  200 #define B_AGE           0x00000001      /* Move to age queue when I/O done. */
  201 #define B_NEEDCOMMIT    0x00000002      /* Append-write in progress. */
  202 #define B_ASYNC         0x00000004      /* Start I/O, do not wait. */
  203 #define B_DIRECT        0x00000008      /* direct I/O flag (pls free vmio) */
  204 #define B_DEFERRED      0x00000010      /* Skipped over for cleaning */
  205 #define B_CACHE         0x00000020      /* Bread found us in the cache. */
  206 #define B_VALIDSUSPWRT  0x00000040      /* Valid write during suspension. */
  207 #define B_DELWRI        0x00000080      /* Delay I/O until buffer reused. */
  208 #define B_PERSISTENT    0x00000100      /* Perm. ref'ed while EXT2FS mounted. */
  209 #define B_DONE          0x00000200      /* I/O completed. */
  210 #define B_EINTR         0x00000400      /* I/O was interrupted */
  211 #define B_00000800      0x00000800      /* Available flag. */
  212 #define B_00001000      0x00001000      /* Available flag. */
  213 #define B_INVAL         0x00002000      /* Does not contain valid info. */
  214 #define B_00004000      0x00004000      /* Available flag. */
  215 #define B_NOCACHE       0x00008000      /* Do not cache block after use. */
  216 #define B_MALLOC        0x00010000      /* malloced b_data */
  217 #define B_CLUSTEROK     0x00020000      /* Pagein op, so swap() can count it. */
  218 #define B_000400000     0x00040000      /* Available flag. */
  219 #define B_000800000     0x00080000      /* Available flag. */
  220 #define B_00100000      0x00100000      /* Available flag. */
  221 #define B_DIRTY         0x00200000      /* Needs writing later (in EXT2FS). */
  222 #define B_RELBUF        0x00400000      /* Release VMIO buffer. */
  223 #define B_00800000      0x00800000      /* Available flag. */
  224 #define B_WRITEINPROG   0x01000000      /* Write in progress. */
  225 #define B_02000000      0x02000000      /* Available flag. */
  226 #define B_PAGING        0x04000000      /* volatile paging I/O -- bypass VMIO */
  227 #define B_08000000      0x08000000      /* Available flag. */
  228 #define B_RAM           0x10000000      /* Read ahead mark (flag) */
  229 #define B_VMIO          0x20000000      /* VMIO flag */
  230 #define B_CLUSTER       0x40000000      /* pagein op, so swap() can count it */
  231 #define B_80000000      0x80000000      /* Available flag. */
  232 
  233 #define PRINT_BUF_FLAGS "\2\40b31\37cluster\36vmio\35ram\34b27" \
  234         "\33paging\32b25\31writeinprog\30b23\27relbuf\26dirty\25b20" \
  235         "\24b19\23b18\22clusterok\21malloc\20nocache\17b14\16inval" \
  236         "\15b12\14b11\13eintr\12done\11persistent\10delwri\7validsuspwrt" \
  237         "\6cache\5deferred\4direct\3async\2needcommit\1age"
  238 
  239 /*
  240  * These flags are kept in b_xflags.
  241  */
  242 #define BX_VNDIRTY      0x00000001      /* On vnode dirty list */
  243 #define BX_VNCLEAN      0x00000002      /* On vnode clean list */
  244 #define BX_BKGRDWRITE   0x00000010      /* Do writes in background */
  245 #define BX_BKGRDMARKER  0x00000020      /* Mark buffer for splay tree */
  246 #define BX_ALTDATA      0x00000040      /* Holds extended data */
  247 
  248 #define NOOFFSET        (-1LL)          /* No buffer offset calculated yet */
  249 
  250 /*
  251  * These flags are kept in b_vflags.
  252  */
  253 #define BV_SCANNED      0x00000001      /* VOP_FSYNC funcs mark written bufs */
  254 #define BV_BKGRDINPROG  0x00000002      /* Background write in progress */
  255 #define BV_BKGRDWAIT    0x00000004      /* Background write waiting */
  256 
  257 #ifdef _KERNEL
  258 /*
  259  * Buffer locking
  260  */
  261 extern const char *buf_wmesg;           /* Default buffer lock message */
  262 #define BUF_WMESG "bufwait"
  263 #include <sys/proc.h>                   /* XXX for curthread */
  264 #include <sys/mutex.h>
  265 
  266 /*
  267  * Initialize a lock.
  268  */
  269 #define BUF_LOCKINIT(bp) \
  270         lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, 0)
  271 /*
  272  *
  273  * Get a lock sleeping non-interruptably until it becomes available.
  274  */
  275 static __inline int BUF_LOCK(struct buf *, int, struct mtx *);
  276 static __inline int
  277 BUF_LOCK(struct buf *bp, int locktype, struct mtx *interlock)
  278 {
  279         int s, ret;
  280 
  281         s = splbio();
  282         mtx_lock(bp->b_lock.lk_interlock);
  283         locktype |= LK_INTERNAL;
  284         bp->b_lock.lk_wmesg = buf_wmesg;
  285         bp->b_lock.lk_prio = PRIBIO + 4;
  286         ret = lockmgr(&(bp)->b_lock, locktype, interlock, curthread);
  287         splx(s);
  288         return ret;
  289 }
  290 /*
  291  * Get a lock sleeping with specified interruptably and timeout.
  292  */
  293 static __inline int BUF_TIMELOCK(struct buf *, int, struct mtx *,
  294     char *, int, int);
  295 static __inline int
  296 BUF_TIMELOCK(struct buf *bp, int locktype, struct mtx *interlock,
  297     char *wmesg, int catch, int timo)
  298 {
  299         int s, ret;
  300 
  301         s = splbio();
  302         mtx_lock(bp->b_lock.lk_interlock);
  303         locktype |= LK_INTERNAL | LK_TIMELOCK;
  304         bp->b_lock.lk_wmesg = wmesg;
  305         bp->b_lock.lk_prio = (PRIBIO + 4) | catch;
  306         bp->b_lock.lk_timo = timo;
  307         ret = lockmgr(&(bp)->b_lock, (locktype), interlock, curthread);
  308         splx(s);
  309         return ret;
  310 }
  311 /*
  312  * Release a lock. Only the acquiring process may free the lock unless
  313  * it has been handed off to biodone.
  314  */
  315 static __inline void BUF_UNLOCK(struct buf *);
  316 static __inline void
  317 BUF_UNLOCK(struct buf *bp)
  318 {
  319         int s;
  320 
  321         s = splbio();
  322         lockmgr(&(bp)->b_lock, LK_RELEASE, NULL, curthread);
  323         splx(s);
  324 }
  325 
  326 /*
  327  * Free a buffer lock.
  328  */
  329 #define BUF_LOCKFREE(bp)                        \
  330 do {                                            \
  331         if (BUF_REFCNT(bp) > 0)                 \
  332                 panic("free locked buf");       \
  333         lockdestroy(&(bp)->b_lock);             \
  334 } while (0)
  335 
  336 #ifdef _SYS_PROC_H_     /* Avoid #include <sys/proc.h> pollution */
  337 /*
  338  * When initiating asynchronous I/O, change ownership of the lock to the
  339  * kernel. Once done, the lock may legally released by biodone. The
  340  * original owning process can no longer acquire it recursively, but must
  341  * wait until the I/O is completed and the lock has been freed by biodone.
  342  */
  343 static __inline void BUF_KERNPROC(struct buf *);
  344 static __inline void
  345 BUF_KERNPROC(struct buf *bp)
  346 {
  347         struct thread *td = curthread;
  348 
  349         if ((td != PCPU_GET(idlethread))
  350         && bp->b_lock.lk_lockholder == td)
  351                 td->td_locks--;
  352         bp->b_lock.lk_lockholder = LK_KERNPROC;
  353 }
  354 #endif
  355 /*
  356  * Find out the number of references to a lock.
  357  */
  358 static __inline int BUF_REFCNT(struct buf *);
  359 static __inline int
  360 BUF_REFCNT(struct buf *bp)
  361 {
  362         int s, ret;
  363 
  364         /*
  365          * When the system is panicing, the lock manager grants all lock
  366          * requests whether or not the lock is available. To avoid "unlocked
  367          * buffer" panics after a crash, we just claim that all buffers
  368          * are locked when cleaning up after a system panic.
  369          */
  370         if (panicstr != NULL)
  371                 return (1);
  372         s = splbio();
  373         ret = lockcount(&(bp)->b_lock);
  374         splx(s);
  375         return ret;
  376 }
  377 
  378 #endif /* _KERNEL */
  379 
  380 struct buf_queue_head {
  381         TAILQ_HEAD(buf_queue, buf) queue;
  382         daddr_t last_pblkno;
  383         struct  buf *insert_point;
  384         struct  buf *switch_point;
  385 };
  386 
  387 /*
  388  * This structure describes a clustered I/O.  It is stored in the b_saveaddr
  389  * field of the buffer on which I/O is done.  At I/O completion, cluster
  390  * callback uses the structure to parcel I/O's to individual buffers, and
  391  * then free's this structure.
  392  */
  393 struct cluster_save {
  394         long    bs_bcount;              /* Saved b_bcount. */
  395         long    bs_bufsize;             /* Saved b_bufsize. */
  396         void    *bs_saveaddr;           /* Saved b_addr. */
  397         int     bs_nchildren;           /* Number of associated buffers. */
  398         struct buf **bs_children;       /* List of associated buffers. */
  399 };
  400 
  401 #ifdef _KERNEL
  402 
  403 
  404 static __inline int
  405 buf_prewrite(struct vnode *vp, struct buf *bp)
  406 {
  407         if (bioops.io_prewrite)
  408                 return (*bioops.io_prewrite)(vp, bp);
  409         else
  410                 return (0);
  411 }
  412 
  413 static __inline void
  414 buf_start(struct buf *bp)
  415 {
  416         if (bioops.io_start)
  417                 (*bioops.io_start)(bp);
  418 }
  419 
  420 static __inline void
  421 buf_complete(struct buf *bp)
  422 {
  423         if (bioops.io_complete)
  424                 (*bioops.io_complete)(bp);
  425 }
  426 
  427 static __inline void
  428 buf_deallocate(struct buf *bp)
  429 {
  430         if (bioops.io_deallocate)
  431                 (*bioops.io_deallocate)(bp);
  432         BUF_LOCKFREE(bp);
  433 }
  434 
  435 static __inline void
  436 buf_movedeps(struct buf *bp, struct buf *bp2)
  437 {
  438         if (bioops.io_movedeps)
  439                 (*bioops.io_movedeps)(bp, bp2);
  440 }
  441 
  442 static __inline int
  443 buf_countdeps(struct buf *bp, int i)
  444 {
  445         if (bioops.io_countdeps)
  446                 return ((*bioops.io_countdeps)(bp, i));
  447         else
  448                 return (0);
  449 }
  450 
  451 #endif /* _KERNEL */
  452 
  453 /*
  454  * Zero out the buffer's data area.
  455  */
  456 #define clrbuf(bp) {                                                    \
  457         bzero((bp)->b_data, (u_int)(bp)->b_bcount);                     \
  458         (bp)->b_resid = 0;                                              \
  459 }
  460 
  461 /*
  462  * Flags for getblk's last parameter.
  463  */
  464 #define GB_LOCK_NOWAIT  0x0001          /* Fail if we block on a buf lock. */
  465 #define GB_NOCREAT      0x0002          /* Don't create a buf if not found. */
  466 
  467 #ifdef _KERNEL
  468 extern int      nbuf;                   /* The number of buffer headers */
  469 extern int      maxswzone;              /* Max KVA for swap structures */
  470 extern int      maxbcache;              /* Max KVA for buffer cache */
  471 extern int      runningbufspace;
  472 extern int      hibufspace;
  473 extern int      buf_maxio;              /* nominal maximum I/O for buffer */
  474 extern struct   buf *buf;               /* The buffer headers. */
  475 extern char     *buffers;               /* The buffer contents. */
  476 extern int      bufpages;               /* Number of memory pages in the buffer pool. */
  477 extern struct   buf *swbuf;             /* Swap I/O buffer headers. */
  478 extern int      nswbuf;                 /* Number of swap I/O buffer headers. */
  479 extern int      cluster_pbuf_freecnt;   /* Number of pbufs for clusters */
  480 extern int      vnode_pbuf_freecnt;     /* Number of pbufs for vnode pager */
  481 
  482 struct uio;
  483 
  484 caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est);
  485 void    bufinit(void);
  486 void    bwillwrite(void);
  487 int     buf_dirty_count_severe(void);
  488 void    bremfree(struct buf *);
  489 int     bread(struct vnode *, daddr_t, int, struct ucred *, struct buf **);
  490 int     breadn(struct vnode *, daddr_t, int, daddr_t *, int *, int,
  491             struct ucred *, struct buf **);
  492 int     bwrite(struct buf *);
  493 void    bdwrite(struct buf *);
  494 void    bawrite(struct buf *);
  495 void    bdirty(struct buf *);
  496 void    bundirty(struct buf *);
  497 void    brelse(struct buf *);
  498 void    bqrelse(struct buf *);
  499 int     vfs_bio_awrite(struct buf *);
  500 struct buf *     getpbuf(int *);
  501 struct buf *incore(struct vnode *, daddr_t);
  502 struct buf *gbincore(struct vnode *, daddr_t);
  503 int     inmem(struct vnode *, daddr_t);
  504 struct buf *getblk(struct vnode *, daddr_t, int, int, int, int);
  505 struct buf *geteblk(int);
  506 int     bufwait(struct buf *);
  507 void    bufdone(struct buf *);
  508 
  509 void    cluster_callback(struct buf *);
  510 int     cluster_read(struct vnode *, u_quad_t, daddr_t, long,
  511             struct ucred *, long, int, struct buf **);
  512 int     cluster_wbuild(struct vnode *, long, daddr_t, int);
  513 void    cluster_write(struct buf *, u_quad_t, int);
  514 void    vfs_bio_set_validclean(struct buf *, int base, int size);
  515 void    vfs_bio_clrbuf(struct buf *);
  516 void    vfs_busy_pages(struct buf *, int clear_modify);
  517 void    vfs_unbusy_pages(struct buf *);
  518 void    vwakeup(struct buf *);
  519 int     vmapbuf(struct buf *);
  520 void    vunmapbuf(struct buf *);
  521 void    relpbuf(struct buf *, int *);
  522 void    brelvp(struct buf *);
  523 void    bgetvp(struct vnode *, struct buf *);
  524 void    pbgetvp(struct vnode *, struct buf *);
  525 void    pbrelvp(struct buf *);
  526 int     allocbuf(struct buf *bp, int size);
  527 void    reassignbuf(struct buf *);
  528 struct  buf *trypbuf(int *);
  529 void    bwait(struct buf *, u_char, const char *);
  530 void    bdone(struct buf *);
  531 
  532 #endif /* _KERNEL */
  533 
  534 #endif /* !_SYS_BUF_H_ */

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