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 *, struct vm_page **, 136 int, int); 137 int b_pgbefore; 138 int b_pgafter; 139 }; 140 }; 141 union cluster_info { 142 TAILQ_HEAD(cluster_list_head, buf) cluster_head; 143 TAILQ_ENTRY(buf) cluster_entry; 144 } b_cluster; 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 struct vm_page *b_pages[]; 160 }; 161 162 #define b_object b_bufobj->bo_object 163 164 /* 165 * These flags are kept in b_flags. 166 * 167 * Notes: 168 * 169 * B_ASYNC VOP calls on bp's are usually async whether or not 170 * B_ASYNC is set, but some subsystems, such as NFS, like 171 * to know what is best for the caller so they can 172 * optimize the I/O. 173 * 174 * B_PAGING Indicates that bp is being used by the paging system or 175 * some paging system and that the bp is not linked into 176 * the b_vp's clean/dirty linked lists or ref counts. 177 * Buffer vp reassignments are illegal in this case. 178 * 179 * B_CACHE This may only be set if the buffer is entirely valid. 180 * The situation where B_DELWRI is set and B_CACHE is 181 * clear MUST be committed to disk by getblk() so 182 * B_DELWRI can also be cleared. See the comments for 183 * getblk() in kern/vfs_bio.c. If B_CACHE is clear, 184 * the caller is expected to clear BIO_ERROR and B_INVAL, 185 * set BIO_READ, and initiate an I/O. 186 * 187 * The 'entire buffer' is defined to be the range from 188 * 0 through b_bcount. 189 * 190 * B_MALLOC Request that the buffer be allocated from the malloc 191 * pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned. 192 * 193 * B_CLUSTEROK This flag is typically set for B_DELWRI buffers 194 * by filesystems that allow clustering when the buffer 195 * is fully dirty and indicates that it may be clustered 196 * with other adjacent dirty buffers. Note the clustering 197 * may not be used with the stage 1 data write under NFS 198 * but may be used for the commit rpc portion. 199 * 200 * B_INVALONERR This flag is set on dirty buffers. It specifies that a 201 * write error should forcibly invalidate the buffer 202 * contents. This flag should be used with caution, as it 203 * discards data. It is incompatible with B_ASYNC. 204 * 205 * B_VMIO Indicates that the buffer is tied into an VM object. 206 * The buffer's data is always PAGE_SIZE aligned even 207 * if b_bufsize and b_bcount are not. ( b_bufsize is 208 * always at least DEV_BSIZE aligned, though ). 209 * 210 * B_DIRECT Hint that we should attempt to completely free 211 * the pages underlying the buffer. B_DIRECT is 212 * sticky until the buffer is released and typically 213 * only has an effect when B_RELBUF is also set. 214 * 215 */ 216 217 #define B_AGE 0x00000001 /* Move to age queue when I/O done. */ 218 #define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */ 219 #define B_ASYNC 0x00000004 /* Start I/O, do not wait. */ 220 #define B_DIRECT 0x00000008 /* direct I/O flag (pls free vmio) */ 221 #define B_DEFERRED 0x00000010 /* Skipped over for cleaning */ 222 #define B_CACHE 0x00000020 /* Bread found us in the cache. */ 223 #define B_VALIDSUSPWRT 0x00000040 /* Valid write during suspension. */ 224 #define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */ 225 #define B_CKHASH 0x00000100 /* checksum hash calculated on read */ 226 #define B_DONE 0x00000200 /* I/O completed. */ 227 #define B_EINTR 0x00000400 /* I/O was interrupted */ 228 #define B_NOREUSE 0x00000800 /* Contents not reused once released. */ 229 #define B_REUSE 0x00001000 /* Contents reused, second chance. */ 230 #define B_INVAL 0x00002000 /* Does not contain valid info. */ 231 #define B_BARRIER 0x00004000 /* Write this and all preceding first. */ 232 #define B_NOCACHE 0x00008000 /* Do not cache block after use. */ 233 #define B_MALLOC 0x00010000 /* malloced b_data */ 234 #define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */ 235 #define B_INVALONERR 0x00040000 /* Invalidate on write error. */ 236 #define B_IOSTARTED 0x00080000 /* buf_start() called */ 237 #define B_00100000 0x00100000 /* Available flag. */ 238 #define B_MAXPHYS 0x00200000 /* nitems(b_pages[]) = atop(MAXPHYS). */ 239 #define B_RELBUF 0x00400000 /* Release VMIO buffer. */ 240 #define B_FS_FLAG1 0x00800000 /* Available flag for FS use. */ 241 #define B_NOCOPY 0x01000000 /* Don't copy-on-write this buf. */ 242 #define B_INFREECNT 0x02000000 /* buf is counted in numfreebufs */ 243 #define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */ 244 #define B_MANAGED 0x08000000 /* Managed by FS. */ 245 #define B_RAM 0x10000000 /* Read ahead mark (flag) */ 246 #define B_VMIO 0x20000000 /* VMIO flag */ 247 #define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */ 248 #define B_REMFREE 0x80000000 /* Delayed bremfree */ 249 250 #define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34managed" \ 251 "\33paging\32infreecnt\31nocopy\30b23\27relbuf\26maxphys\25b20" \ 252 "\24iostarted\23invalonerr\22clusterok\21malloc\20nocache\17b14" \ 253 "\16inval\15reuse\14noreuse\13eintr\12done\11b8\10delwri" \ 254 "\7validsuspwrt\6cache\5deferred\4direct\3async\2needcommit\1age" 255 256 /* 257 * These flags are kept in b_xflags. 258 * 259 * BX_FSPRIV reserves a set of eight flags that may be used by individual 260 * filesystems for their own purpose. Their specific definitions are 261 * found in the header files for each filesystem that uses them. 262 */ 263 #define BX_VNDIRTY 0x00000001 /* On vnode dirty list */ 264 #define BX_VNCLEAN 0x00000002 /* On vnode clean list */ 265 #define BX_CVTENXIO 0x00000004 /* Convert errors to ENXIO */ 266 #define BX_BKGRDWRITE 0x00000010 /* Do writes in background */ 267 #define BX_BKGRDMARKER 0x00000020 /* Mark buffer for splay tree */ 268 #define BX_ALTDATA 0x00000040 /* Holds extended data */ 269 #define BX_FSPRIV 0x00FF0000 /* Filesystem-specific flags mask */ 270 271 #define PRINT_BUF_XFLAGS "\20\7altdata\6bkgrdmarker\5bkgrdwrite\3cvtenxio" \ 272 "\2clean\1dirty" 273 274 #define NOOFFSET (-1LL) /* No buffer offset calculated yet */ 275 276 /* 277 * These flags are kept in b_vflags. 278 */ 279 #define BV_SCANNED 0x00000001 /* VOP_FSYNC funcs mark written bufs */ 280 #define BV_BKGRDINPROG 0x00000002 /* Background write in progress */ 281 #define BV_BKGRDWAIT 0x00000004 /* Background write waiting */ 282 #define BV_BKGRDERR 0x00000008 /* Error from background write */ 283 284 #define PRINT_BUF_VFLAGS "\20\4bkgrderr\3bkgrdwait\2bkgrdinprog\1scanned" 285 286 #ifdef _KERNEL 287 288 #ifndef NSWBUF_MIN 289 #define NSWBUF_MIN 16 290 #endif 291 292 /* 293 * Buffer locking 294 */ 295 #include <sys/proc.h> /* XXX for curthread */ 296 #include <sys/mutex.h> 297 298 /* 299 * Initialize a lock. 300 */ 301 #define BUF_LOCKINIT(bp, wmesg) \ 302 lockinit(&(bp)->b_lock, PRIBIO + 4, wmesg, 0, LK_NEW) 303 /* 304 * 305 * Get a lock sleeping non-interruptably until it becomes available. 306 */ 307 #define BUF_LOCK(bp, locktype, interlock) \ 308 _lockmgr_args_rw(&(bp)->b_lock, (locktype), (interlock), \ 309 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 310 LOCK_FILE, LOCK_LINE) 311 312 /* 313 * Get a lock sleeping with specified interruptably and timeout. 314 */ 315 #define BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo) \ 316 _lockmgr_args_rw(&(bp)->b_lock, (locktype) | LK_TIMELOCK, \ 317 (interlock), (wmesg), (PRIBIO + 4) | (catch), (timo), \ 318 LOCK_FILE, LOCK_LINE) 319 320 /* 321 * Release a lock. Only the acquiring process may free the lock unless 322 * it has been handed off to biodone. 323 */ 324 #define BUF_UNLOCK(bp) do { \ 325 KASSERT(((bp)->b_flags & B_REMFREE) == 0, \ 326 ("BUF_UNLOCK %p while B_REMFREE is still set.", (bp))); \ 327 \ 328 BUF_UNLOCK_RAW((bp)); \ 329 } while (0) 330 #define BUF_UNLOCK_RAW(bp) do { \ 331 (void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL, \ 332 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 333 LOCK_FILE, LOCK_LINE); \ 334 } while (0) 335 336 /* 337 * Check if a buffer lock is recursed. 338 */ 339 #define BUF_LOCKRECURSED(bp) \ 340 lockmgr_recursed(&(bp)->b_lock) 341 342 /* 343 * Check if a buffer lock is currently held. 344 */ 345 #define BUF_ISLOCKED(bp) \ 346 lockstatus(&(bp)->b_lock) 347 /* 348 * Free a buffer lock. 349 */ 350 #define BUF_LOCKFREE(bp) \ 351 lockdestroy(&(bp)->b_lock) 352 353 /* 354 * Print informations on a buffer lock. 355 */ 356 #define BUF_LOCKPRINTINFO(bp) \ 357 lockmgr_printinfo(&(bp)->b_lock) 358 359 /* 360 * Buffer lock assertions. 361 */ 362 #if defined(INVARIANTS) && defined(INVARIANT_SUPPORT) 363 #define BUF_ASSERT_LOCKED(bp) \ 364 _lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE) 365 #define BUF_ASSERT_SLOCKED(bp) \ 366 _lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE) 367 #define BUF_ASSERT_XLOCKED(bp) \ 368 _lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE) 369 #define BUF_ASSERT_UNLOCKED(bp) \ 370 _lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE) 371 #else 372 #define BUF_ASSERT_LOCKED(bp) 373 #define BUF_ASSERT_SLOCKED(bp) 374 #define BUF_ASSERT_XLOCKED(bp) 375 #define BUF_ASSERT_UNLOCKED(bp) 376 #endif 377 378 #ifdef _SYS_PROC_H_ /* Avoid #include <sys/proc.h> pollution */ 379 /* 380 * When initiating asynchronous I/O, change ownership of the lock to the 381 * kernel. Once done, the lock may legally released by biodone. The 382 * original owning process can no longer acquire it recursively, but must 383 * wait until the I/O is completed and the lock has been freed by biodone. 384 */ 385 #define BUF_KERNPROC(bp) \ 386 _lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE) 387 #endif 388 389 #endif /* _KERNEL */ 390 391 struct buf_queue_head { 392 TAILQ_HEAD(buf_queue, buf) queue; 393 daddr_t last_pblkno; 394 struct buf *insert_point; 395 struct buf *switch_point; 396 }; 397 398 /* 399 * This structure describes a clustered I/O. 400 */ 401 struct cluster_save { 402 long bs_bcount; /* Saved b_bcount. */ 403 long bs_bufsize; /* Saved b_bufsize. */ 404 int bs_nchildren; /* Number of associated buffers. */ 405 struct buf **bs_children; /* List of associated buffers. */ 406 }; 407 408 /* 409 * Vnode clustering tracker 410 */ 411 struct vn_clusterw { 412 daddr_t v_cstart; /* v start block of cluster */ 413 daddr_t v_lasta; /* v last allocation */ 414 daddr_t v_lastw; /* v last write */ 415 int v_clen; /* v length of cur. cluster */ 416 }; 417 418 #ifdef _KERNEL 419 420 static __inline int 421 bwrite(struct buf *bp) 422 { 423 424 KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp)); 425 KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp)); 426 KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL, 427 ("bwrite: no bop_write bp=%p", bp)); 428 return (BO_WRITE(bp->b_bufobj, bp)); 429 } 430 431 static __inline void 432 bstrategy(struct buf *bp) 433 { 434 435 KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp)); 436 KASSERT(bp->b_bufobj->bo_ops != NULL, 437 ("bstrategy: no bo_ops bp=%p", bp)); 438 KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL, 439 ("bstrategy: no bop_strategy bp=%p", bp)); 440 BO_STRATEGY(bp->b_bufobj, bp); 441 } 442 443 static __inline void 444 buf_start(struct buf *bp) 445 { 446 KASSERT((bp->b_flags & B_IOSTARTED) == 0, 447 ("recursed buf_start %p", bp)); 448 bp->b_flags |= B_IOSTARTED; 449 if (bioops.io_start) 450 (*bioops.io_start)(bp); 451 } 452 453 static __inline void 454 buf_complete(struct buf *bp) 455 { 456 if ((bp->b_flags & B_IOSTARTED) != 0) { 457 bp->b_flags &= ~B_IOSTARTED; 458 if (bioops.io_complete) 459 (*bioops.io_complete)(bp); 460 } 461 } 462 463 static __inline void 464 buf_deallocate(struct buf *bp) 465 { 466 if (bioops.io_deallocate) 467 (*bioops.io_deallocate)(bp); 468 } 469 470 static __inline int 471 buf_countdeps(struct buf *bp, int i) 472 { 473 if (bioops.io_countdeps) 474 return ((*bioops.io_countdeps)(bp, i)); 475 else 476 return (0); 477 } 478 479 static __inline void 480 buf_track(struct buf *bp __unused, const char *location __unused) 481 { 482 483 #if defined(FULL_BUF_TRACKING) 484 bp->b_io_tracking[BUF_TRACKING_ENTRY(bp->b_io_tcnt++)] = location; 485 #elif defined(BUF_TRACKING) 486 bp->b_io_tracking = location; 487 #endif 488 } 489 490 #endif /* _KERNEL */ 491 492 /* 493 * Zero out the buffer's data area. 494 */ 495 #define clrbuf(bp) { \ 496 bzero((bp)->b_data, (u_int)(bp)->b_bcount); \ 497 (bp)->b_resid = 0; \ 498 } 499 500 /* 501 * Flags for getblk's last parameter. 502 */ 503 #define GB_LOCK_NOWAIT 0x0001 /* Fail if we block on a buf lock. */ 504 #define GB_NOCREAT 0x0002 /* Don't create a buf if not found. */ 505 #define GB_NOWAIT_BD 0x0004 /* Do not wait for bufdaemon. */ 506 #define GB_UNMAPPED 0x0008 /* Do not mmap buffer pages. */ 507 #define GB_KVAALLOC 0x0010 /* But allocate KVA. */ 508 #define GB_CKHASH 0x0020 /* If reading, calc checksum hash */ 509 #define GB_NOSPARSE 0x0040 /* Do not instantiate holes */ 510 #define GB_CVTENXIO 0x0080 /* Convert errors to ENXIO */ 511 #define GB_NOWITNESS 0x0100 /* Do not record for WITNESS */ 512 513 #ifdef _KERNEL 514 extern int nbuf; /* The number of buffer headers */ 515 extern u_long maxswzone; /* Max KVA for swap structures */ 516 extern u_long maxbcache; /* Max KVA for buffer cache */ 517 extern int maxbcachebuf; /* Max buffer cache block size */ 518 extern long runningbufspace; 519 extern long hibufspace; 520 extern int dirtybufthresh; 521 extern int bdwriteskip; 522 extern int dirtybufferflushes; 523 extern int altbufferflushes; 524 extern int nswbuf; /* Number of swap I/O buffer headers. */ 525 extern caddr_t __read_mostly unmapped_buf; /* Data address for unmapped 526 buffers. */ 527 528 static inline int 529 buf_mapped(struct buf *bp) 530 { 531 532 return (bp->b_data != unmapped_buf); 533 } 534 535 void runningbufwakeup(struct buf *); 536 void waitrunningbufspace(void); 537 caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est); 538 void bufinit(void); 539 void bufshutdown(int); 540 void bdata2bio(struct buf *bp, struct bio *bip); 541 void bwillwrite(void); 542 int buf_dirty_count_severe(void); 543 void bremfree(struct buf *); 544 void bremfreef(struct buf *); /* XXX Force bremfree, only for nfs. */ 545 #define bread(vp, blkno, size, cred, bpp) \ 546 breadn_flags(vp, blkno, blkno, size, NULL, NULL, 0, cred, 0, \ 547 NULL, bpp) 548 #define bread_gb(vp, blkno, size, cred, gbflags, bpp) \ 549 breadn_flags(vp, blkno, blkno, size, NULL, NULL, 0, cred, \ 550 gbflags, NULL, bpp) 551 #define breadn(vp, blkno, size, rablkno, rabsize, cnt, cred, bpp) \ 552 breadn_flags(vp, blkno, blkno, size, rablkno, rabsize, cnt, cred, \ 553 0, NULL, bpp) 554 int breadn_flags(struct vnode *, daddr_t, daddr_t, int, daddr_t *, int *, 555 int, struct ucred *, int, void (*)(struct buf *), struct buf **); 556 void bdwrite(struct buf *); 557 void bawrite(struct buf *); 558 void babarrierwrite(struct buf *); 559 int bbarrierwrite(struct buf *); 560 void bdirty(struct buf *); 561 void bundirty(struct buf *); 562 void bufstrategy(struct bufobj *, struct buf *); 563 void brelse(struct buf *); 564 void bqrelse(struct buf *); 565 int vfs_bio_awrite(struct buf *); 566 void vfs_busy_pages_acquire(struct buf *bp); 567 void vfs_busy_pages_release(struct buf *bp); 568 struct buf *incore(struct bufobj *, daddr_t); 569 bool inmem(struct vnode *, daddr_t); 570 struct buf *gbincore(struct bufobj *, daddr_t); 571 struct buf *gbincore_unlocked(struct bufobj *, daddr_t); 572 struct buf *getblk(struct vnode *, daddr_t, int, int, int, int); 573 int getblkx(struct vnode *vp, daddr_t blkno, daddr_t dblkno, int size, 574 int slpflag, int slptimeo, int flags, struct buf **bpp); 575 struct buf *geteblk(int, int); 576 int bufwait(struct buf *); 577 int bufwrite(struct buf *); 578 void bufdone(struct buf *); 579 void bd_speedup(void); 580 581 extern uma_zone_t pbuf_zone; 582 uma_zone_t pbuf_zsecond_create(const char *name, int max); 583 584 struct vn_clusterw; 585 586 void cluster_init_vn(struct vn_clusterw *vnc); 587 int cluster_read(struct vnode *, u_quad_t, daddr_t, long, 588 struct ucred *, long, int, int, struct buf **); 589 int cluster_wbuild(struct vnode *, long, daddr_t, int, int); 590 void cluster_write(struct vnode *, struct vn_clusterw *, struct buf *, 591 u_quad_t, int, int); 592 void vfs_bio_brelse(struct buf *bp, int ioflags); 593 void vfs_bio_bzero_buf(struct buf *bp, int base, int size); 594 void vfs_bio_clrbuf(struct buf *); 595 void vfs_bio_set_flags(struct buf *bp, int ioflags); 596 void vfs_bio_set_valid(struct buf *, int base, int size); 597 void vfs_busy_pages(struct buf *, int clear_modify); 598 void vfs_unbusy_pages(struct buf *); 599 int vmapbuf(struct buf *, void *, size_t, int); 600 void vunmapbuf(struct buf *); 601 void brelvp(struct buf *); 602 void bgetvp(struct vnode *, struct buf *); 603 void pbgetbo(struct bufobj *bo, struct buf *bp); 604 void pbgetvp(struct vnode *, struct buf *); 605 void pbrelbo(struct buf *); 606 void pbrelvp(struct buf *); 607 int allocbuf(struct buf *bp, int size); 608 void reassignbuf(struct buf *); 609 void bwait(struct buf *, u_char, const char *); 610 void bdone(struct buf *); 611 612 typedef daddr_t (vbg_get_lblkno_t)(struct vnode *, vm_ooffset_t); 613 typedef int (vbg_get_blksize_t)(struct vnode *, daddr_t, long *); 614 int vfs_bio_getpages(struct vnode *vp, struct vm_page **ma, int count, 615 int *rbehind, int *rahead, vbg_get_lblkno_t get_lblkno, 616 vbg_get_blksize_t get_blksize); 617 618 #endif /* _KERNEL */ 619 620 #endif /* !_SYS_BUF_H_ */ 621