1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)buf.h 8.9 (Berkeley) 3/30/95 37 * $FreeBSD$ 38 */ 39 40 #ifndef _SYS_BUF_H_ 41 #define _SYS_BUF_H_ 42 43 #include <sys/bufobj.h> 44 #include <sys/queue.h> 45 #include <sys/lock.h> 46 #include <sys/lockmgr.h> 47 #include <vm/uma.h> 48 49 struct bio; 50 struct buf; 51 struct bufobj; 52 struct mount; 53 struct vnode; 54 struct uio; 55 56 /* 57 * To avoid including <ufs/ffs/softdep.h> 58 */ 59 LIST_HEAD(workhead, worklist); 60 /* 61 * These are currently used only by the soft dependency code, hence 62 * are stored once in a global variable. If other subsystems wanted 63 * to use these hooks, a pointer to a set of bio_ops could be added 64 * to each buffer. 65 */ 66 extern struct bio_ops { 67 void (*io_start)(struct buf *); 68 void (*io_complete)(struct buf *); 69 void (*io_deallocate)(struct buf *); 70 int (*io_countdeps)(struct buf *, int); 71 } bioops; 72 73 struct vm_object; 74 struct vm_page; 75 76 typedef uint32_t b_xflags_t; 77 78 /* 79 * The buffer header describes an I/O operation in the kernel. 80 * 81 * NOTES: 82 * b_bufsize, b_bcount. b_bufsize is the allocation size of the 83 * buffer, either DEV_BSIZE or PAGE_SIZE aligned. b_bcount is the 84 * originally requested buffer size and can serve as a bounds check 85 * against EOF. For most, but not all uses, b_bcount == b_bufsize. 86 * 87 * b_dirtyoff, b_dirtyend. Buffers support piecemeal, unaligned 88 * ranges of dirty data that need to be written to backing store. 89 * The range is typically clipped at b_bcount ( not b_bufsize ). 90 * 91 * b_resid. Number of bytes remaining in I/O. After an I/O operation 92 * completes, b_resid is usually 0 indicating 100% success. 93 * 94 * All fields are protected by the buffer lock except those marked: 95 * V - Protected by owning bufobj lock 96 * Q - Protected by the buf queue lock 97 * D - Protected by an dependency implementation specific lock 98 */ 99 struct buf { 100 struct bufobj *b_bufobj; 101 long b_bcount; 102 void *b_caller1; 103 caddr_t b_data; 104 int b_error; 105 uint16_t b_iocmd; /* BIO_* bio_cmd from bio.h */ 106 uint16_t b_ioflags; /* BIO_* bio_flags from bio.h */ 107 off_t b_iooffset; 108 long b_resid; 109 void (*b_iodone)(struct buf *); 110 void (*b_ckhashcalc)(struct buf *); 111 uint64_t b_ckhash; /* B_CKHASH requested check-hash */ 112 daddr_t b_blkno; /* Underlying physical block number. */ 113 off_t b_offset; /* Offset into file. */ 114 TAILQ_ENTRY(buf) b_bobufs; /* (V) Buffer's associated vnode. */ 115 uint32_t b_vflags; /* (V) BV_* flags */ 116 uint8_t b_qindex; /* (Q) buffer queue index */ 117 uint8_t b_domain; /* (Q) buf domain this resides in */ 118 uint16_t b_subqueue; /* (Q) per-cpu q if any */ 119 uint32_t b_flags; /* B_* flags. */ 120 b_xflags_t b_xflags; /* extra flags */ 121 struct lock b_lock; /* Buffer lock */ 122 long b_bufsize; /* Allocated buffer size. */ 123 int b_runningbufspace; /* when I/O is running, pipelining */ 124 int b_kvasize; /* size of kva for buffer */ 125 int b_dirtyoff; /* Offset in buffer of dirty region. */ 126 int b_dirtyend; /* Offset of end of dirty region. */ 127 caddr_t b_kvabase; /* base kva for buffer */ 128 daddr_t b_lblkno; /* Logical block number. */ 129 struct vnode *b_vp; /* Device vnode. */ 130 struct ucred *b_rcred; /* Read credentials reference. */ 131 struct ucred *b_wcred; /* Write credentials reference. */ 132 union { 133 TAILQ_ENTRY(buf) b_freelist; /* (Q) */ 134 struct { 135 void (*b_pgiodone)(void *, vm_page_t *, int, int); 136 int b_pgbefore; 137 int b_pgafter; 138 }; 139 }; 140 union cluster_info { 141 TAILQ_HEAD(cluster_list_head, buf) cluster_head; 142 TAILQ_ENTRY(buf) cluster_entry; 143 } b_cluster; 144 struct vm_page *b_pages[btoc(MAXPHYS)]; 145 int b_npages; 146 struct workhead b_dep; /* (D) List of filesystem dependencies. */ 147 void *b_fsprivate1; 148 void *b_fsprivate2; 149 void *b_fsprivate3; 150 151 #if defined(FULL_BUF_TRACKING) 152 #define BUF_TRACKING_SIZE 32 153 #define BUF_TRACKING_ENTRY(x) ((x) & (BUF_TRACKING_SIZE - 1)) 154 const char *b_io_tracking[BUF_TRACKING_SIZE]; 155 uint32_t b_io_tcnt; 156 #elif defined(BUF_TRACKING) 157 const char *b_io_tracking; 158 #endif 159 }; 160 161 #define b_object b_bufobj->bo_object 162 163 /* 164 * These flags are kept in b_flags. 165 * 166 * Notes: 167 * 168 * B_ASYNC VOP calls on bp's are usually async whether or not 169 * B_ASYNC is set, but some subsystems, such as NFS, like 170 * to know what is best for the caller so they can 171 * optimize the I/O. 172 * 173 * B_PAGING Indicates that bp is being used by the paging system or 174 * some paging system and that the bp is not linked into 175 * the b_vp's clean/dirty linked lists or ref counts. 176 * Buffer vp reassignments are illegal in this case. 177 * 178 * B_CACHE This may only be set if the buffer is entirely valid. 179 * The situation where B_DELWRI is set and B_CACHE is 180 * clear MUST be committed to disk by getblk() so 181 * B_DELWRI can also be cleared. See the comments for 182 * getblk() in kern/vfs_bio.c. If B_CACHE is clear, 183 * the caller is expected to clear BIO_ERROR and B_INVAL, 184 * set BIO_READ, and initiate an I/O. 185 * 186 * The 'entire buffer' is defined to be the range from 187 * 0 through b_bcount. 188 * 189 * B_MALLOC Request that the buffer be allocated from the malloc 190 * pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned. 191 * 192 * B_CLUSTEROK This flag is typically set for B_DELWRI buffers 193 * by filesystems that allow clustering when the buffer 194 * is fully dirty and indicates that it may be clustered 195 * with other adjacent dirty buffers. Note the clustering 196 * may not be used with the stage 1 data write under NFS 197 * but may be used for the commit rpc portion. 198 * 199 * B_VMIO Indicates that the buffer is tied into an VM object. 200 * The buffer's data is always PAGE_SIZE aligned even 201 * if b_bufsize and b_bcount are not. ( b_bufsize is 202 * always at least DEV_BSIZE aligned, though ). 203 * 204 * B_DIRECT Hint that we should attempt to completely free 205 * the pages underlying the buffer. B_DIRECT is 206 * sticky until the buffer is released and typically 207 * only has an effect when B_RELBUF is also set. 208 * 209 */ 210 211 #define B_AGE 0x00000001 /* Move to age queue when I/O done. */ 212 #define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */ 213 #define B_ASYNC 0x00000004 /* Start I/O, do not wait. */ 214 #define B_DIRECT 0x00000008 /* direct I/O flag (pls free vmio) */ 215 #define B_DEFERRED 0x00000010 /* Skipped over for cleaning */ 216 #define B_CACHE 0x00000020 /* Bread found us in the cache. */ 217 #define B_VALIDSUSPWRT 0x00000040 /* Valid write during suspension. */ 218 #define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */ 219 #define B_CKHASH 0x00000100 /* checksum hash calculated on read */ 220 #define B_DONE 0x00000200 /* I/O completed. */ 221 #define B_EINTR 0x00000400 /* I/O was interrupted */ 222 #define B_NOREUSE 0x00000800 /* Contents not reused once released. */ 223 #define B_REUSE 0x00001000 /* Contents reused, second chance. */ 224 #define B_INVAL 0x00002000 /* Does not contain valid info. */ 225 #define B_BARRIER 0x00004000 /* Write this and all preceding first. */ 226 #define B_NOCACHE 0x00008000 /* Do not cache block after use. */ 227 #define B_MALLOC 0x00010000 /* malloced b_data */ 228 #define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */ 229 #define B_00040000 0x00040000 /* Available flag. */ 230 #define B_00080000 0x00080000 /* Available flag. */ 231 #define B_00100000 0x00100000 /* Available flag. */ 232 #define B_00200000 0x00200000 /* Available flag. */ 233 #define B_RELBUF 0x00400000 /* Release VMIO buffer. */ 234 #define B_FS_FLAG1 0x00800000 /* Available flag for FS use. */ 235 #define B_NOCOPY 0x01000000 /* Don't copy-on-write this buf. */ 236 #define B_INFREECNT 0x02000000 /* buf is counted in numfreebufs */ 237 #define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */ 238 #define B_MANAGED 0x08000000 /* Managed by FS. */ 239 #define B_RAM 0x10000000 /* Read ahead mark (flag) */ 240 #define B_VMIO 0x20000000 /* VMIO flag */ 241 #define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */ 242 #define B_REMFREE 0x80000000 /* Delayed bremfree */ 243 244 #define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34managed" \ 245 "\33paging\32infreecnt\31nocopy\30b23\27relbuf\26b21\25b20" \ 246 "\24b19\23b18\22clusterok\21malloc\20nocache\17b14\16inval" \ 247 "\15reuse\14noreuse\13eintr\12done\11b8\10delwri" \ 248 "\7validsuspwrt\6cache\5deferred\4direct\3async\2needcommit\1age" 249 250 /* 251 * These flags are kept in b_xflags. 252 * 253 * BX_FSPRIV reserves a set of eight flags that may be used by individual 254 * filesystems for their own purpose. Their specific definitions are 255 * found in the header files for each filesystem that uses them. 256 */ 257 #define BX_VNDIRTY 0x00000001 /* On vnode dirty list */ 258 #define BX_VNCLEAN 0x00000002 /* On vnode clean list */ 259 #define BX_BKGRDWRITE 0x00000010 /* Do writes in background */ 260 #define BX_BKGRDMARKER 0x00000020 /* Mark buffer for splay tree */ 261 #define BX_ALTDATA 0x00000040 /* Holds extended data */ 262 #define BX_FSPRIV 0x00FF0000 /* filesystem-specific flags mask */ 263 264 #define PRINT_BUF_XFLAGS "\20\7altdata\6bkgrdmarker\5bkgrdwrite\2clean\1dirty" 265 266 #define NOOFFSET (-1LL) /* No buffer offset calculated yet */ 267 268 /* 269 * These flags are kept in b_vflags. 270 */ 271 #define BV_SCANNED 0x00000001 /* VOP_FSYNC funcs mark written bufs */ 272 #define BV_BKGRDINPROG 0x00000002 /* Background write in progress */ 273 #define BV_BKGRDWAIT 0x00000004 /* Background write waiting */ 274 #define BV_BKGRDERR 0x00000008 /* Error from background write */ 275 276 #define PRINT_BUF_VFLAGS "\20\4bkgrderr\3bkgrdwait\2bkgrdinprog\1scanned" 277 278 #ifdef _KERNEL 279 280 #ifndef NSWBUF_MIN 281 #define NSWBUF_MIN 16 282 #endif 283 284 /* 285 * Buffer locking 286 */ 287 extern const char *buf_wmesg; /* Default buffer lock message */ 288 #define BUF_WMESG "bufwait" 289 #include <sys/proc.h> /* XXX for curthread */ 290 #include <sys/mutex.h> 291 292 /* 293 * Initialize a lock. 294 */ 295 #define BUF_LOCKINIT(bp) \ 296 lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, LK_NEW) 297 /* 298 * 299 * Get a lock sleeping non-interruptably until it becomes available. 300 */ 301 #define BUF_LOCK(bp, locktype, interlock) \ 302 _lockmgr_args_rw(&(bp)->b_lock, (locktype), (interlock), \ 303 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 304 LOCK_FILE, LOCK_LINE) 305 306 /* 307 * Get a lock sleeping with specified interruptably and timeout. 308 */ 309 #define BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo) \ 310 _lockmgr_args_rw(&(bp)->b_lock, (locktype) | LK_TIMELOCK, \ 311 (interlock), (wmesg), (PRIBIO + 4) | (catch), (timo), \ 312 LOCK_FILE, LOCK_LINE) 313 314 /* 315 * Release a lock. Only the acquiring process may free the lock unless 316 * it has been handed off to biodone. 317 */ 318 #define BUF_UNLOCK(bp) do { \ 319 KASSERT(((bp)->b_flags & B_REMFREE) == 0, \ 320 ("BUF_UNLOCK %p while B_REMFREE is still set.", (bp))); \ 321 \ 322 (void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL, \ 323 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 324 LOCK_FILE, LOCK_LINE); \ 325 } while (0) 326 327 /* 328 * Check if a buffer lock is recursed. 329 */ 330 #define BUF_LOCKRECURSED(bp) \ 331 lockmgr_recursed(&(bp)->b_lock) 332 333 /* 334 * Check if a buffer lock is currently held. 335 */ 336 #define BUF_ISLOCKED(bp) \ 337 lockstatus(&(bp)->b_lock) 338 /* 339 * Free a buffer lock. 340 */ 341 #define BUF_LOCKFREE(bp) \ 342 lockdestroy(&(bp)->b_lock) 343 344 /* 345 * Print informations on a buffer lock. 346 */ 347 #define BUF_LOCKPRINTINFO(bp) \ 348 lockmgr_printinfo(&(bp)->b_lock) 349 350 /* 351 * Buffer lock assertions. 352 */ 353 #if defined(INVARIANTS) && defined(INVARIANT_SUPPORT) 354 #define BUF_ASSERT_LOCKED(bp) \ 355 _lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE) 356 #define BUF_ASSERT_SLOCKED(bp) \ 357 _lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE) 358 #define BUF_ASSERT_XLOCKED(bp) \ 359 _lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE) 360 #define BUF_ASSERT_UNLOCKED(bp) \ 361 _lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE) 362 #define BUF_ASSERT_HELD(bp) 363 #define BUF_ASSERT_UNHELD(bp) 364 #else 365 #define BUF_ASSERT_LOCKED(bp) 366 #define BUF_ASSERT_SLOCKED(bp) 367 #define BUF_ASSERT_XLOCKED(bp) 368 #define BUF_ASSERT_UNLOCKED(bp) 369 #define BUF_ASSERT_HELD(bp) 370 #define BUF_ASSERT_UNHELD(bp) 371 #endif 372 373 #ifdef _SYS_PROC_H_ /* Avoid #include <sys/proc.h> pollution */ 374 /* 375 * When initiating asynchronous I/O, change ownership of the lock to the 376 * kernel. Once done, the lock may legally released by biodone. The 377 * original owning process can no longer acquire it recursively, but must 378 * wait until the I/O is completed and the lock has been freed by biodone. 379 */ 380 #define BUF_KERNPROC(bp) \ 381 _lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE) 382 #endif 383 384 #endif /* _KERNEL */ 385 386 struct buf_queue_head { 387 TAILQ_HEAD(buf_queue, buf) queue; 388 daddr_t last_pblkno; 389 struct buf *insert_point; 390 struct buf *switch_point; 391 }; 392 393 /* 394 * This structure describes a clustered I/O. 395 */ 396 struct cluster_save { 397 long bs_bcount; /* Saved b_bcount. */ 398 long bs_bufsize; /* Saved b_bufsize. */ 399 int bs_nchildren; /* Number of associated buffers. */ 400 struct buf **bs_children; /* List of associated buffers. */ 401 }; 402 403 #ifdef _KERNEL 404 405 static __inline int 406 bwrite(struct buf *bp) 407 { 408 409 KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp)); 410 KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp)); 411 KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL, 412 ("bwrite: no bop_write bp=%p", bp)); 413 return (BO_WRITE(bp->b_bufobj, bp)); 414 } 415 416 static __inline void 417 bstrategy(struct buf *bp) 418 { 419 420 KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp)); 421 KASSERT(bp->b_bufobj->bo_ops != NULL, 422 ("bstrategy: no bo_ops bp=%p", bp)); 423 KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL, 424 ("bstrategy: no bop_strategy bp=%p", bp)); 425 BO_STRATEGY(bp->b_bufobj, bp); 426 } 427 428 static __inline void 429 buf_start(struct buf *bp) 430 { 431 if (bioops.io_start) 432 (*bioops.io_start)(bp); 433 } 434 435 static __inline void 436 buf_complete(struct buf *bp) 437 { 438 if (bioops.io_complete) 439 (*bioops.io_complete)(bp); 440 } 441 442 static __inline void 443 buf_deallocate(struct buf *bp) 444 { 445 if (bioops.io_deallocate) 446 (*bioops.io_deallocate)(bp); 447 } 448 449 static __inline int 450 buf_countdeps(struct buf *bp, int i) 451 { 452 if (bioops.io_countdeps) 453 return ((*bioops.io_countdeps)(bp, i)); 454 else 455 return (0); 456 } 457 458 static __inline void 459 buf_track(struct buf *bp, const char *location) 460 { 461 462 #if defined(FULL_BUF_TRACKING) 463 bp->b_io_tracking[BUF_TRACKING_ENTRY(bp->b_io_tcnt++)] = location; 464 #elif defined(BUF_TRACKING) 465 bp->b_io_tracking = location; 466 #endif 467 } 468 469 #endif /* _KERNEL */ 470 471 /* 472 * Zero out the buffer's data area. 473 */ 474 #define clrbuf(bp) { \ 475 bzero((bp)->b_data, (u_int)(bp)->b_bcount); \ 476 (bp)->b_resid = 0; \ 477 } 478 479 /* 480 * Flags for getblk's last parameter. 481 */ 482 #define GB_LOCK_NOWAIT 0x0001 /* Fail if we block on a buf lock. */ 483 #define GB_NOCREAT 0x0002 /* Don't create a buf if not found. */ 484 #define GB_NOWAIT_BD 0x0004 /* Do not wait for bufdaemon. */ 485 #define GB_UNMAPPED 0x0008 /* Do not mmap buffer pages. */ 486 #define GB_KVAALLOC 0x0010 /* But allocate KVA. */ 487 #define GB_CKHASH 0x0020 /* If reading, calc checksum hash */ 488 #define GB_NOSPARSE 0x0040 /* Do not instantiate holes */ 489 490 #ifdef _KERNEL 491 extern int nbuf; /* The number of buffer headers */ 492 extern long maxswzone; /* Max KVA for swap structures */ 493 extern long maxbcache; /* Max KVA for buffer cache */ 494 extern int maxbcachebuf; /* Max buffer cache block size */ 495 extern long runningbufspace; 496 extern long hibufspace; 497 extern int dirtybufthresh; 498 extern int bdwriteskip; 499 extern int dirtybufferflushes; 500 extern int altbufferflushes; 501 extern int nswbuf; /* Number of swap I/O buffer headers. */ 502 extern caddr_t unmapped_buf; /* Data address for unmapped buffers. */ 503 504 static inline int 505 buf_mapped(struct buf *bp) 506 { 507 508 return (bp->b_data != unmapped_buf); 509 } 510 511 void runningbufwakeup(struct buf *); 512 void waitrunningbufspace(void); 513 caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est); 514 void bufinit(void); 515 void bufshutdown(int); 516 void bdata2bio(struct buf *bp, struct bio *bip); 517 void bwillwrite(void); 518 int buf_dirty_count_severe(void); 519 void bremfree(struct buf *); 520 void bremfreef(struct buf *); /* XXX Force bremfree, only for nfs. */ 521 #define bread(vp, blkno, size, cred, bpp) \ 522 breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, 0, NULL, bpp) 523 #define bread_gb(vp, blkno, size, cred, gbflags, bpp) \ 524 breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, \ 525 gbflags, NULL, bpp) 526 #define breadn(vp, blkno, size, rablkno, rabsize, cnt, cred, bpp) \ 527 breadn_flags(vp, blkno, size, rablkno, rabsize, cnt, cred, \ 528 0, NULL, bpp) 529 int breadn_flags(struct vnode *, daddr_t, int, daddr_t *, int *, int, 530 struct ucred *, int, void (*)(struct buf *), struct buf **); 531 void bdwrite(struct buf *); 532 void bawrite(struct buf *); 533 void babarrierwrite(struct buf *); 534 int bbarrierwrite(struct buf *); 535 void bdirty(struct buf *); 536 void bundirty(struct buf *); 537 void bufstrategy(struct bufobj *, struct buf *); 538 void brelse(struct buf *); 539 void bqrelse(struct buf *); 540 int vfs_bio_awrite(struct buf *); 541 void vfs_drain_busy_pages(struct buf *bp); 542 struct buf *incore(struct bufobj *, daddr_t); 543 struct buf *gbincore(struct bufobj *, daddr_t); 544 struct buf *getblk(struct vnode *, daddr_t, int, int, int, int); 545 int getblkx(struct vnode *vp, daddr_t blkno, int size, int slpflag, 546 int slptimeo, int flags, struct buf **bpp); 547 struct buf *geteblk(int, int); 548 int bufwait(struct buf *); 549 int bufwrite(struct buf *); 550 void bufdone(struct buf *); 551 void bd_speedup(void); 552 553 extern uma_zone_t pbuf_zone; 554 uma_zone_t pbuf_zsecond_create(char *name, int max); 555 556 int cluster_read(struct vnode *, u_quad_t, daddr_t, long, 557 struct ucred *, long, int, int, struct buf **); 558 int cluster_wbuild(struct vnode *, long, daddr_t, int, int); 559 void cluster_write(struct vnode *, struct buf *, u_quad_t, int, int); 560 void vfs_bio_brelse(struct buf *bp, int ioflags); 561 void vfs_bio_bzero_buf(struct buf *bp, int base, int size); 562 void vfs_bio_clrbuf(struct buf *); 563 void vfs_bio_set_flags(struct buf *bp, int ioflags); 564 void vfs_bio_set_valid(struct buf *, int base, int size); 565 void vfs_busy_pages(struct buf *, int clear_modify); 566 void vfs_unbusy_pages(struct buf *); 567 int vmapbuf(struct buf *, int); 568 void vunmapbuf(struct buf *); 569 void brelvp(struct buf *); 570 void bgetvp(struct vnode *, struct buf *); 571 void pbgetbo(struct bufobj *bo, struct buf *bp); 572 void pbgetvp(struct vnode *, struct buf *); 573 void pbrelbo(struct buf *); 574 void pbrelvp(struct buf *); 575 int allocbuf(struct buf *bp, int size); 576 void reassignbuf(struct buf *); 577 void bwait(struct buf *, u_char, const char *); 578 void bdone(struct buf *); 579 580 typedef daddr_t (vbg_get_lblkno_t)(struct vnode *, vm_ooffset_t); 581 typedef int (vbg_get_blksize_t)(struct vnode *, daddr_t); 582 int vfs_bio_getpages(struct vnode *vp, struct vm_page **ma, int count, 583 int *rbehind, int *rahead, vbg_get_lblkno_t get_lblkno, 584 vbg_get_blksize_t get_blksize); 585 586 #endif /* _KERNEL */ 587 588 #endif /* !_SYS_BUF_H_ */ 589