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. 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/bufobj.h> 42 #include <sys/queue.h> 43 #include <sys/lock.h> 44 #include <sys/lockmgr.h> 45 46 struct bio; 47 struct buf; 48 struct bufobj; 49 struct mount; 50 struct vnode; 51 struct uio; 52 53 /* 54 * To avoid including <ufs/ffs/softdep.h> 55 */ 56 LIST_HEAD(workhead, worklist); 57 /* 58 * These are currently used only by the soft dependency code, hence 59 * are stored once in a global variable. If other subsystems wanted 60 * to use these hooks, a pointer to a set of bio_ops could be added 61 * to each buffer. 62 */ 63 extern struct bio_ops { 64 void (*io_start)(struct buf *); 65 void (*io_complete)(struct buf *); 66 void (*io_deallocate)(struct buf *); 67 int (*io_countdeps)(struct buf *, int); 68 } bioops; 69 70 struct vm_object; 71 struct vm_page; 72 73 typedef uint32_t b_xflags_t; 74 75 /* 76 * The buffer header describes an I/O operation in the kernel. 77 * 78 * NOTES: 79 * b_bufsize, b_bcount. b_bufsize is the allocation size of the 80 * buffer, either DEV_BSIZE or PAGE_SIZE aligned. b_bcount is the 81 * originally requested buffer size and can serve as a bounds check 82 * against EOF. For most, but not all uses, b_bcount == b_bufsize. 83 * 84 * b_dirtyoff, b_dirtyend. Buffers support piecemeal, unaligned 85 * ranges of dirty data that need to be written to backing store. 86 * The range is typically clipped at b_bcount ( not b_bufsize ). 87 * 88 * b_resid. Number of bytes remaining in I/O. After an I/O operation 89 * completes, b_resid is usually 0 indicating 100% success. 90 * 91 * All fields are protected by the buffer lock except those marked: 92 * V - Protected by owning bufobj lock 93 * Q - Protected by the buf queue lock 94 * D - Protected by an dependency implementation specific lock 95 */ 96 struct buf { 97 struct bufobj *b_bufobj; 98 long b_bcount; 99 void *b_caller1; 100 caddr_t b_data; 101 int b_error; 102 uint16_t b_iocmd; /* BIO_* bio_cmd from bio.h */ 103 uint16_t b_ioflags; /* BIO_* bio_flags from bio.h */ 104 off_t b_iooffset; 105 long b_resid; 106 void (*b_iodone)(struct buf *); 107 void (*b_ckhashcalc)(struct buf *); 108 uint64_t b_ckhash; /* B_CKHASH requested check-hash */ 109 daddr_t b_blkno; /* Underlying physical block number. */ 110 off_t b_offset; /* Offset into file. */ 111 TAILQ_ENTRY(buf) b_bobufs; /* (V) Buffer's associated vnode. */ 112 uint32_t b_vflags; /* (V) BV_* flags */ 113 unsigned short b_qindex; /* (Q) buffer queue index */ 114 uint32_t b_flags; /* B_* flags. */ 115 b_xflags_t b_xflags; /* extra flags */ 116 struct lock b_lock; /* Buffer lock */ 117 long b_bufsize; /* Allocated buffer size. */ 118 int b_runningbufspace; /* when I/O is running, pipelining */ 119 int b_kvasize; /* size of kva for buffer */ 120 int b_dirtyoff; /* Offset in buffer of dirty region. */ 121 int b_dirtyend; /* Offset of end of dirty region. */ 122 caddr_t b_kvabase; /* base kva for buffer */ 123 daddr_t b_lblkno; /* Logical block number. */ 124 struct vnode *b_vp; /* Device vnode. */ 125 struct ucred *b_rcred; /* Read credentials reference. */ 126 struct ucred *b_wcred; /* Write credentials reference. */ 127 union { 128 TAILQ_ENTRY(buf) b_freelist; /* (Q) */ 129 struct { 130 void (*b_pgiodone)(void *, vm_page_t *, int, int); 131 int b_pgbefore; 132 int b_pgafter; 133 }; 134 }; 135 union cluster_info { 136 TAILQ_HEAD(cluster_list_head, buf) cluster_head; 137 TAILQ_ENTRY(buf) cluster_entry; 138 } b_cluster; 139 struct vm_page *b_pages[btoc(MAXPHYS)]; 140 int b_npages; 141 struct workhead b_dep; /* (D) List of filesystem dependencies. */ 142 void *b_fsprivate1; 143 void *b_fsprivate2; 144 void *b_fsprivate3; 145 146 #if defined(FULL_BUF_TRACKING) 147 #define BUF_TRACKING_SIZE 32 148 #define BUF_TRACKING_ENTRY(x) ((x) & (BUF_TRACKING_SIZE - 1)) 149 const char *b_io_tracking[BUF_TRACKING_SIZE]; 150 uint32_t b_io_tcnt; 151 #elif defined(BUF_TRACKING) 152 const char *b_io_tracking; 153 #endif 154 }; 155 156 #define b_object b_bufobj->bo_object 157 158 /* 159 * These flags are kept in b_flags. 160 * 161 * Notes: 162 * 163 * B_ASYNC VOP calls on bp's are usually async whether or not 164 * B_ASYNC is set, but some subsystems, such as NFS, like 165 * to know what is best for the caller so they can 166 * optimize the I/O. 167 * 168 * B_PAGING Indicates that bp is being used by the paging system or 169 * some paging system and that the bp is not linked into 170 * the b_vp's clean/dirty linked lists or ref counts. 171 * Buffer vp reassignments are illegal in this case. 172 * 173 * B_CACHE This may only be set if the buffer is entirely valid. 174 * The situation where B_DELWRI is set and B_CACHE is 175 * clear MUST be committed to disk by getblk() so 176 * B_DELWRI can also be cleared. See the comments for 177 * getblk() in kern/vfs_bio.c. If B_CACHE is clear, 178 * the caller is expected to clear BIO_ERROR and B_INVAL, 179 * set BIO_READ, and initiate an I/O. 180 * 181 * The 'entire buffer' is defined to be the range from 182 * 0 through b_bcount. 183 * 184 * B_MALLOC Request that the buffer be allocated from the malloc 185 * pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned. 186 * 187 * B_CLUSTEROK This flag is typically set for B_DELWRI buffers 188 * by filesystems that allow clustering when the buffer 189 * is fully dirty and indicates that it may be clustered 190 * with other adjacent dirty buffers. Note the clustering 191 * may not be used with the stage 1 data write under NFS 192 * but may be used for the commit rpc portion. 193 * 194 * B_VMIO Indicates that the buffer is tied into an VM object. 195 * The buffer's data is always PAGE_SIZE aligned even 196 * if b_bufsize and b_bcount are not. ( b_bufsize is 197 * always at least DEV_BSIZE aligned, though ). 198 * 199 * B_DIRECT Hint that we should attempt to completely free 200 * the pages underlying the buffer. B_DIRECT is 201 * sticky until the buffer is released and typically 202 * only has an effect when B_RELBUF is also set. 203 * 204 */ 205 206 #define B_AGE 0x00000001 /* Move to age queue when I/O done. */ 207 #define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */ 208 #define B_ASYNC 0x00000004 /* Start I/O, do not wait. */ 209 #define B_DIRECT 0x00000008 /* direct I/O flag (pls free vmio) */ 210 #define B_DEFERRED 0x00000010 /* Skipped over for cleaning */ 211 #define B_CACHE 0x00000020 /* Bread found us in the cache. */ 212 #define B_VALIDSUSPWRT 0x00000040 /* Valid write during suspension. */ 213 #define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */ 214 #define B_CKHASH 0x00000100 /* checksum hash calculated on read */ 215 #define B_DONE 0x00000200 /* I/O completed. */ 216 #define B_EINTR 0x00000400 /* I/O was interrupted */ 217 #define B_NOREUSE 0x00000800 /* Contents not reused once released. */ 218 #define B_00001000 0x00001000 /* Available flag. */ 219 #define B_INVAL 0x00002000 /* Does not contain valid info. */ 220 #define B_BARRIER 0x00004000 /* Write this and all preceding first. */ 221 #define B_NOCACHE 0x00008000 /* Do not cache block after use. */ 222 #define B_MALLOC 0x00010000 /* malloced b_data */ 223 #define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */ 224 #define B_00040000 0x00040000 /* Available flag. */ 225 #define B_00080000 0x00080000 /* Available flag. */ 226 #define B_00100000 0x00100000 /* Available flag. */ 227 #define B_00200000 0x00200000 /* Available flag. */ 228 #define B_RELBUF 0x00400000 /* Release VMIO buffer. */ 229 #define B_FS_FLAG1 0x00800000 /* Available flag for FS use. */ 230 #define B_NOCOPY 0x01000000 /* Don't copy-on-write this buf. */ 231 #define B_INFREECNT 0x02000000 /* buf is counted in numfreebufs */ 232 #define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */ 233 #define B_MANAGED 0x08000000 /* Managed by FS. */ 234 #define B_RAM 0x10000000 /* Read ahead mark (flag) */ 235 #define B_VMIO 0x20000000 /* VMIO flag */ 236 #define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */ 237 #define B_REMFREE 0x80000000 /* Delayed bremfree */ 238 239 #define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34managed" \ 240 "\33paging\32infreecnt\31nocopy\30b23\27relbuf\26b21\25b20" \ 241 "\24b19\23b18\22clusterok\21malloc\20nocache\17b14\16inval" \ 242 "\15b12\14noreuse\13eintr\12done\11b8\10delwri" \ 243 "\7validsuspwrt\6cache\5deferred\4direct\3async\2needcommit\1age" 244 245 /* 246 * These flags are kept in b_xflags. 247 * 248 * BX_FSPRIV reserves a set of eight flags that may be used by individual 249 * filesystems for their own purpose. Their specific definitions are 250 * found in the header files for each filesystem that uses them. 251 */ 252 #define BX_VNDIRTY 0x00000001 /* On vnode dirty list */ 253 #define BX_VNCLEAN 0x00000002 /* On vnode clean list */ 254 #define BX_BKGRDWRITE 0x00000010 /* Do writes in background */ 255 #define BX_BKGRDMARKER 0x00000020 /* Mark buffer for splay tree */ 256 #define BX_ALTDATA 0x00000040 /* Holds extended data */ 257 #define BX_FSPRIV 0x00FF0000 /* filesystem-specific flags mask */ 258 259 #define PRINT_BUF_XFLAGS "\20\7altdata\6bkgrdmarker\5bkgrdwrite\2clean\1dirty" 260 261 #define NOOFFSET (-1LL) /* No buffer offset calculated yet */ 262 263 /* 264 * These flags are kept in b_vflags. 265 */ 266 #define BV_SCANNED 0x00000001 /* VOP_FSYNC funcs mark written bufs */ 267 #define BV_BKGRDINPROG 0x00000002 /* Background write in progress */ 268 #define BV_BKGRDWAIT 0x00000004 /* Background write waiting */ 269 #define BV_BKGRDERR 0x00000008 /* Error from background write */ 270 271 #define PRINT_BUF_VFLAGS "\20\4bkgrderr\3bkgrdwait\2bkgrdinprog\1scanned" 272 273 #ifdef _KERNEL 274 /* 275 * Buffer locking 276 */ 277 extern const char *buf_wmesg; /* Default buffer lock message */ 278 #define BUF_WMESG "bufwait" 279 #include <sys/proc.h> /* XXX for curthread */ 280 #include <sys/mutex.h> 281 282 /* 283 * Initialize a lock. 284 */ 285 #define BUF_LOCKINIT(bp) \ 286 lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, 0) 287 /* 288 * 289 * Get a lock sleeping non-interruptably until it becomes available. 290 */ 291 #define BUF_LOCK(bp, locktype, interlock) \ 292 _lockmgr_args_rw(&(bp)->b_lock, (locktype), (interlock), \ 293 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 294 LOCK_FILE, LOCK_LINE) 295 296 /* 297 * Get a lock sleeping with specified interruptably and timeout. 298 */ 299 #define BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo) \ 300 _lockmgr_args_rw(&(bp)->b_lock, (locktype) | LK_TIMELOCK, \ 301 (interlock), (wmesg), (PRIBIO + 4) | (catch), (timo), \ 302 LOCK_FILE, LOCK_LINE) 303 304 /* 305 * Release a lock. Only the acquiring process may free the lock unless 306 * it has been handed off to biodone. 307 */ 308 #define BUF_UNLOCK(bp) do { \ 309 KASSERT(((bp)->b_flags & B_REMFREE) == 0, \ 310 ("BUF_UNLOCK %p while B_REMFREE is still set.", (bp))); \ 311 \ 312 (void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL, \ 313 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 314 LOCK_FILE, LOCK_LINE); \ 315 } while (0) 316 317 /* 318 * Check if a buffer lock is recursed. 319 */ 320 #define BUF_LOCKRECURSED(bp) \ 321 lockmgr_recursed(&(bp)->b_lock) 322 323 /* 324 * Check if a buffer lock is currently held. 325 */ 326 #define BUF_ISLOCKED(bp) \ 327 lockstatus(&(bp)->b_lock) 328 /* 329 * Free a buffer lock. 330 */ 331 #define BUF_LOCKFREE(bp) \ 332 lockdestroy(&(bp)->b_lock) 333 334 /* 335 * Print informations on a buffer lock. 336 */ 337 #define BUF_LOCKPRINTINFO(bp) \ 338 lockmgr_printinfo(&(bp)->b_lock) 339 340 /* 341 * Buffer lock assertions. 342 */ 343 #if defined(INVARIANTS) && defined(INVARIANT_SUPPORT) 344 #define BUF_ASSERT_LOCKED(bp) \ 345 _lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE) 346 #define BUF_ASSERT_SLOCKED(bp) \ 347 _lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE) 348 #define BUF_ASSERT_XLOCKED(bp) \ 349 _lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE) 350 #define BUF_ASSERT_UNLOCKED(bp) \ 351 _lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE) 352 #define BUF_ASSERT_HELD(bp) 353 #define BUF_ASSERT_UNHELD(bp) 354 #else 355 #define BUF_ASSERT_LOCKED(bp) 356 #define BUF_ASSERT_SLOCKED(bp) 357 #define BUF_ASSERT_XLOCKED(bp) 358 #define BUF_ASSERT_UNLOCKED(bp) 359 #define BUF_ASSERT_HELD(bp) 360 #define BUF_ASSERT_UNHELD(bp) 361 #endif 362 363 #ifdef _SYS_PROC_H_ /* Avoid #include <sys/proc.h> pollution */ 364 /* 365 * When initiating asynchronous I/O, change ownership of the lock to the 366 * kernel. Once done, the lock may legally released by biodone. The 367 * original owning process can no longer acquire it recursively, but must 368 * wait until the I/O is completed and the lock has been freed by biodone. 369 */ 370 #define BUF_KERNPROC(bp) \ 371 _lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE) 372 #endif 373 374 #endif /* _KERNEL */ 375 376 struct buf_queue_head { 377 TAILQ_HEAD(buf_queue, buf) queue; 378 daddr_t last_pblkno; 379 struct buf *insert_point; 380 struct buf *switch_point; 381 }; 382 383 /* 384 * This structure describes a clustered I/O. 385 */ 386 struct cluster_save { 387 long bs_bcount; /* Saved b_bcount. */ 388 long bs_bufsize; /* Saved b_bufsize. */ 389 int bs_nchildren; /* Number of associated buffers. */ 390 struct buf **bs_children; /* List of associated buffers. */ 391 }; 392 393 #ifdef _KERNEL 394 395 static __inline int 396 bwrite(struct buf *bp) 397 { 398 399 KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp)); 400 KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp)); 401 KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL, 402 ("bwrite: no bop_write bp=%p", bp)); 403 return (BO_WRITE(bp->b_bufobj, bp)); 404 } 405 406 static __inline void 407 bstrategy(struct buf *bp) 408 { 409 410 KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp)); 411 KASSERT(bp->b_bufobj->bo_ops != NULL, 412 ("bstrategy: no bo_ops bp=%p", bp)); 413 KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL, 414 ("bstrategy: no bop_strategy bp=%p", bp)); 415 BO_STRATEGY(bp->b_bufobj, bp); 416 } 417 418 static __inline void 419 buf_start(struct buf *bp) 420 { 421 if (bioops.io_start) 422 (*bioops.io_start)(bp); 423 } 424 425 static __inline void 426 buf_complete(struct buf *bp) 427 { 428 if (bioops.io_complete) 429 (*bioops.io_complete)(bp); 430 } 431 432 static __inline void 433 buf_deallocate(struct buf *bp) 434 { 435 if (bioops.io_deallocate) 436 (*bioops.io_deallocate)(bp); 437 } 438 439 static __inline int 440 buf_countdeps(struct buf *bp, int i) 441 { 442 if (bioops.io_countdeps) 443 return ((*bioops.io_countdeps)(bp, i)); 444 else 445 return (0); 446 } 447 448 static __inline void 449 buf_track(struct buf *bp, const char *location) 450 { 451 452 #if defined(FULL_BUF_TRACKING) 453 bp->b_io_tracking[BUF_TRACKING_ENTRY(bp->b_io_tcnt++)] = location; 454 #elif defined(BUF_TRACKING) 455 bp->b_io_tracking = location; 456 #endif 457 } 458 459 #endif /* _KERNEL */ 460 461 /* 462 * Zero out the buffer's data area. 463 */ 464 #define clrbuf(bp) { \ 465 bzero((bp)->b_data, (u_int)(bp)->b_bcount); \ 466 (bp)->b_resid = 0; \ 467 } 468 469 /* 470 * Flags for getblk's last parameter. 471 */ 472 #define GB_LOCK_NOWAIT 0x0001 /* Fail if we block on a buf lock. */ 473 #define GB_NOCREAT 0x0002 /* Don't create a buf if not found. */ 474 #define GB_NOWAIT_BD 0x0004 /* Do not wait for bufdaemon. */ 475 #define GB_UNMAPPED 0x0008 /* Do not mmap buffer pages. */ 476 #define GB_KVAALLOC 0x0010 /* But allocate KVA. */ 477 #define GB_CKHASH 0x0020 /* If reading, calc checksum hash */ 478 479 #ifdef _KERNEL 480 extern int nbuf; /* The number of buffer headers */ 481 extern long maxswzone; /* Max KVA for swap structures */ 482 extern long maxbcache; /* Max KVA for buffer cache */ 483 extern int maxbcachebuf; /* Max buffer cache block size */ 484 extern long runningbufspace; 485 extern long hibufspace; 486 extern int dirtybufthresh; 487 extern int bdwriteskip; 488 extern int dirtybufferflushes; 489 extern int altbufferflushes; 490 extern int nswbuf; /* Number of swap I/O buffer headers. */ 491 extern int cluster_pbuf_freecnt; /* Number of pbufs for clusters */ 492 extern int vnode_pbuf_freecnt; /* Number of pbufs for vnode pager */ 493 extern int vnode_async_pbuf_freecnt; /* Number of pbufs for vnode pager, 494 asynchronous reads */ 495 extern caddr_t unmapped_buf; /* Data address for unmapped buffers. */ 496 497 static inline int 498 buf_mapped(struct buf *bp) 499 { 500 501 return (bp->b_data != unmapped_buf); 502 } 503 504 void runningbufwakeup(struct buf *); 505 void waitrunningbufspace(void); 506 caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est); 507 void bufinit(void); 508 void bufshutdown(int); 509 void bdata2bio(struct buf *bp, struct bio *bip); 510 void bwillwrite(void); 511 int buf_dirty_count_severe(void); 512 void bremfree(struct buf *); 513 void bremfreef(struct buf *); /* XXX Force bremfree, only for nfs. */ 514 #define bread(vp, blkno, size, cred, bpp) \ 515 breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, 0, NULL, bpp) 516 #define bread_gb(vp, blkno, size, cred, gbflags, bpp) \ 517 breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, \ 518 gbflags, NULL, bpp) 519 #define breadn(vp, blkno, size, rablkno, rabsize, cnt, cred, bpp) \ 520 breadn_flags(vp, blkno, size, rablkno, rabsize, cnt, cred, \ 521 0, NULL, bpp) 522 int breadn_flags(struct vnode *, daddr_t, int, daddr_t *, int *, int, 523 struct ucred *, int, void (*)(struct buf *), struct buf **); 524 void bdwrite(struct buf *); 525 void bawrite(struct buf *); 526 void babarrierwrite(struct buf *); 527 int bbarrierwrite(struct buf *); 528 void bdirty(struct buf *); 529 void bundirty(struct buf *); 530 void bufstrategy(struct bufobj *, struct buf *); 531 void brelse(struct buf *); 532 void bqrelse(struct buf *); 533 int vfs_bio_awrite(struct buf *); 534 void vfs_drain_busy_pages(struct buf *bp); 535 struct buf * getpbuf(int *); 536 struct buf *incore(struct bufobj *, daddr_t); 537 struct buf *gbincore(struct bufobj *, daddr_t); 538 struct buf *getblk(struct vnode *, daddr_t, int, int, int, int); 539 struct buf *geteblk(int, int); 540 int bufwait(struct buf *); 541 int bufwrite(struct buf *); 542 void bufdone(struct buf *); 543 void bufdone_finish(struct buf *); 544 void bd_speedup(void); 545 546 int cluster_read(struct vnode *, u_quad_t, daddr_t, long, 547 struct ucred *, long, int, int, struct buf **); 548 int cluster_wbuild(struct vnode *, long, daddr_t, int, int); 549 void cluster_write(struct vnode *, struct buf *, u_quad_t, int, int); 550 void vfs_bio_brelse(struct buf *bp, int ioflags); 551 void vfs_bio_bzero_buf(struct buf *bp, int base, int size); 552 void vfs_bio_clrbuf(struct buf *); 553 void vfs_bio_set_flags(struct buf *bp, int ioflags); 554 void vfs_bio_set_valid(struct buf *, int base, int size); 555 void vfs_busy_pages(struct buf *, int clear_modify); 556 void vfs_unbusy_pages(struct buf *); 557 int vmapbuf(struct buf *, int); 558 void vunmapbuf(struct buf *); 559 void relpbuf(struct buf *, int *); 560 void brelvp(struct buf *); 561 void bgetvp(struct vnode *, struct buf *); 562 void pbgetbo(struct bufobj *bo, struct buf *bp); 563 void pbgetvp(struct vnode *, struct buf *); 564 void pbrelbo(struct buf *); 565 void pbrelvp(struct buf *); 566 int allocbuf(struct buf *bp, int size); 567 void reassignbuf(struct buf *); 568 struct buf *trypbuf(int *); 569 void bwait(struct buf *, u_char, const char *); 570 void bdone(struct buf *); 571 572 typedef daddr_t (vbg_get_lblkno_t)(struct vnode *, vm_ooffset_t); 573 typedef int (vbg_get_blksize_t)(struct vnode *, daddr_t); 574 int vfs_bio_getpages(struct vnode *vp, struct vm_page **ma, int count, 575 int *rbehind, int *rahead, vbg_get_lblkno_t get_lblkno, 576 vbg_get_blksize_t get_blksize); 577 578 #endif /* _KERNEL */ 579 580 #endif /* !_SYS_BUF_H_ */ 581