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 37#ifndef _SYS_BUF_H_ 38#define _SYS_BUF_H_ 39 40#include <sys/bufobj.h> 41#include <sys/queue.h> 42#include <sys/lock.h> 43#include <sys/lockmgr.h> 44#include <vm/uma.h> 45 46struct bio; 47struct buf; 48struct bufobj; 49struct mount; 50struct vnode; 51struct uio; 52 53/* 54 * To avoid including <ufs/ffs/softdep.h> 55 */ 56LIST_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 */ 63extern 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 70struct vm_object; 71struct vm_page; 72 73typedef 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 */ 96struct 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 uint8_t b_qindex; /* (Q) buffer queue index */ 114 uint8_t b_domain; /* (Q) buf domain this resides in */ 115 uint16_t b_subqueue; /* (Q) per-cpu q if any */ 116 uint32_t b_flags; /* B_* flags. */ 117 b_xflags_t b_xflags; /* extra flags */ 118 struct lock b_lock; /* Buffer lock */ 119 long b_bufsize; /* Allocated buffer size. */ 120 int b_runningbufspace; /* when I/O is running, pipelining */ 121 int b_kvasize; /* size of kva for buffer */ 122 int b_dirtyoff; /* Offset in buffer of dirty region. */ 123 int b_dirtyend; /* Offset of end of dirty region. */ 124 caddr_t b_kvabase; /* base kva for buffer */ 125 daddr_t b_lblkno; /* Logical block number. */ 126 struct vnode *b_vp; /* Device vnode. */ 127 struct ucred *b_rcred; /* Read credentials reference. */ 128 struct ucred *b_wcred; /* Write credentials reference. */ 129 union { 130 TAILQ_ENTRY(buf) b_freelist; /* (Q) */ 131 struct { 132 void (*b_pgiodone)(void *, struct vm_page **, 133 int, int); 134 int b_pgbefore; 135 int b_pgafter; 136 }; 137 }; 138 union cluster_info { 139 TAILQ_HEAD(cluster_list_head, buf) cluster_head; 140 TAILQ_ENTRY(buf) cluster_entry; 141 } b_cluster; 142 int b_npages; 143 struct workhead b_dep; /* (D) List of filesystem dependencies. */ 144 void *b_fsprivate1; 145 void *b_fsprivate2; 146 void *b_fsprivate3; 147 148#if defined(FULL_BUF_TRACKING) 149#define BUF_TRACKING_SIZE 32 150#define BUF_TRACKING_ENTRY(x) ((x) & (BUF_TRACKING_SIZE - 1)) 151 const char *b_io_tracking[BUF_TRACKING_SIZE]; 152 uint32_t b_io_tcnt; 153#elif defined(BUF_TRACKING) 154 const char *b_io_tracking; 155#endif 156 struct vm_page *b_pages[]; 157}; 158 159#define b_object b_bufobj->bo_object 160 161/* 162 * These flags are kept in b_flags. 163 * 164 * Notes: 165 * 166 * B_ASYNC VOP calls on bp's are usually async whether or not 167 * B_ASYNC is set, but some subsystems, such as NFS, like 168 * to know what is best for the caller so they can 169 * optimize the I/O. 170 * 171 * B_PAGING Indicates that bp is being used by the paging system or 172 * some paging system and that the bp is not linked into 173 * the b_vp's clean/dirty linked lists or ref counts. 174 * Buffer vp reassignments are illegal in this case. 175 * 176 * B_CACHE This may only be set if the buffer is entirely valid. 177 * The situation where B_DELWRI is set and B_CACHE is 178 * clear MUST be committed to disk by getblk() so 179 * B_DELWRI can also be cleared. See the comments for 180 * getblk() in kern/vfs_bio.c. If B_CACHE is clear, 181 * the caller is expected to clear BIO_ERROR and B_INVAL, 182 * set BIO_READ, and initiate an I/O. 183 * 184 * The 'entire buffer' is defined to be the range from 185 * 0 through b_bcount. 186 * 187 * B_MALLOC Request that the buffer be allocated from the malloc 188 * pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned. 189 * 190 * B_CLUSTEROK This flag is typically set for B_DELWRI buffers 191 * by filesystems that allow clustering when the buffer 192 * is fully dirty and indicates that it may be clustered 193 * with other adjacent dirty buffers. Note the clustering 194 * may not be used with the stage 1 data write under NFS 195 * but may be used for the commit rpc portion. 196 * 197 * B_INVALONERR This flag is set on dirty buffers. It specifies that a 198 * write error should forcibly invalidate the buffer 199 * contents. This flag should be used with caution, as it 200 * discards data. It is incompatible with B_ASYNC. 201 * 202 * B_VMIO Indicates that the buffer is tied into an VM object. 203 * The buffer's data is always PAGE_SIZE aligned even 204 * if b_bufsize and b_bcount are not. ( b_bufsize is 205 * always at least DEV_BSIZE aligned, though ). 206 * 207 * B_DIRECT Hint that we should attempt to completely free 208 * the pages underlying the buffer. B_DIRECT is 209 * sticky until the buffer is released and typically 210 * only has an effect when B_RELBUF is also set. 211 * 212 */ 213 214#define B_AGE 0x00000001 /* Move to age queue when I/O done. */ 215#define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */ 216#define B_ASYNC 0x00000004 /* Start I/O, do not wait. */ 217#define B_DIRECT 0x00000008 /* direct I/O flag (pls free vmio) */ 218#define B_DEFERRED 0x00000010 /* Skipped over for cleaning */ 219#define B_CACHE 0x00000020 /* Bread found us in the cache. */ 220#define B_VALIDSUSPWRT 0x00000040 /* Valid write during suspension. */ 221#define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */ 222#define B_CKHASH 0x00000100 /* checksum hash calculated on read */ 223#define B_DONE 0x00000200 /* I/O completed. */ 224#define B_EINTR 0x00000400 /* I/O was interrupted */ 225#define B_NOREUSE 0x00000800 /* Contents not reused once released. */ 226#define B_REUSE 0x00001000 /* Contents reused, second chance. */ 227#define B_INVAL 0x00002000 /* Does not contain valid info. */ 228#define B_BARRIER 0x00004000 /* Write this and all preceding first. */ 229#define B_NOCACHE 0x00008000 /* Do not cache block after use. */ 230#define B_MALLOC 0x00010000 /* malloced b_data */ 231#define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */ 232#define B_INVALONERR 0x00040000 /* Invalidate on write error. */ 233#define B_IOSTARTED 0x00080000 /* buf_start() called */ 234#define B_00100000 0x00100000 /* Available flag. */ 235#define B_MAXPHYS 0x00200000 /* nitems(b_pages[]) = atop(MAXPHYS). */ 236#define B_RELBUF 0x00400000 /* Release VMIO buffer. */ 237#define B_FS_FLAG1 0x00800000 /* Available flag for FS use. */ 238#define B_NOCOPY 0x01000000 /* Don't copy-on-write this buf. */ 239#define B_INFREECNT 0x02000000 /* buf is counted in numfreebufs */ 240#define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */ 241#define B_MANAGED 0x08000000 /* Managed by FS. */ 242#define B_RAM 0x10000000 /* Read ahead mark (flag) */ 243#define B_VMIO 0x20000000 /* VMIO flag */ 244#define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */ 245#define B_REMFREE 0x80000000 /* Delayed bremfree */ 246 247#define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34managed" \ 248 "\33paging\32infreecnt\31nocopy\30b23\27relbuf\26maxphys\25b20" \ 249 "\24iostarted\23invalonerr\22clusterok\21malloc\20nocache\17b14" \ 250 "\16inval\15reuse\14noreuse\13eintr\12done\11b8\10delwri" \ 251 "\7validsuspwrt\6cache\5deferred\4direct\3async\2needcommit\1age" 252 253/* 254 * These flags are kept in b_xflags. 255 * 256 * BX_FSPRIV reserves a set of eight flags that may be used by individual 257 * filesystems for their own purpose. Their specific definitions are 258 * found in the header files for each filesystem that uses them. 259 */ 260#define BX_VNDIRTY 0x00000001 /* On vnode dirty list */ 261#define BX_VNCLEAN 0x00000002 /* On vnode clean list */ 262#define BX_CVTENXIO 0x00000004 /* Convert errors to ENXIO */ 263#define BX_BKGRDWRITE 0x00000010 /* Do writes in background */ 264#define BX_BKGRDMARKER 0x00000020 /* Mark buffer for splay tree */ 265#define BX_ALTDATA 0x00000040 /* Holds extended data */ 266#define BX_FSPRIV 0x00FF0000 /* Filesystem-specific flags mask */ 267 268#define PRINT_BUF_XFLAGS "\20\7altdata\6bkgrdmarker\5bkgrdwrite\3cvtenxio" \ 269 "\2clean\1dirty" 270 271#define NOOFFSET (-1LL) /* No buffer offset calculated yet */ 272 273/* 274 * These flags are kept in b_vflags. 275 */ 276#define BV_SCANNED 0x00000001 /* VOP_FSYNC funcs mark written bufs */ 277#define BV_BKGRDINPROG 0x00000002 /* Background write in progress */ 278#define BV_BKGRDWAIT 0x00000004 /* Background write waiting */ 279#define BV_BKGRDERR 0x00000008 /* Error from background write */ 280 281#define PRINT_BUF_VFLAGS "\20\4bkgrderr\3bkgrdwait\2bkgrdinprog\1scanned" 282 283#ifdef _KERNEL 284 285#ifndef NSWBUF_MIN 286#define NSWBUF_MIN 16 287#endif 288 289/* 290 * Buffer locking 291 */ 292#include <sys/proc.h> /* XXX for curthread */ 293#include <sys/mutex.h> 294 295/* 296 * Initialize a lock. 297 */ 298#define BUF_LOCKINIT(bp, wmesg) \ 299 lockinit(&(bp)->b_lock, PRIBIO + 4, wmesg, 0, LK_NEW) 300/* 301 * 302 * Get a lock sleeping non-interruptably until it becomes available. 303 */ 304#define BUF_LOCK(bp, locktype, interlock) \ 305 _lockmgr_args_rw(&(bp)->b_lock, (locktype), (interlock), \ 306 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 307 LOCK_FILE, LOCK_LINE) 308 309/* 310 * Get a lock sleeping with specified interruptably and timeout. 311 */ 312#define BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo) \ 313 _lockmgr_args_rw(&(bp)->b_lock, (locktype) | LK_TIMELOCK, \ 314 (interlock), (wmesg), (PRIBIO + 4) | (catch), (timo), \ 315 LOCK_FILE, LOCK_LINE) 316 317/* 318 * Release a lock. Only the acquiring process may free the lock unless 319 * it has been handed off to biodone. 320 */ 321#define BUF_UNLOCK(bp) do { \ 322 KASSERT(((bp)->b_flags & B_REMFREE) == 0, \ 323 ("BUF_UNLOCK %p while B_REMFREE is still set.", (bp))); \ 324 \ 325 BUF_UNLOCK_RAW((bp)); \ 326} while (0) 327#define BUF_UNLOCK_RAW(bp) do { \ 328 (void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL, \ 329 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \ 330 LOCK_FILE, LOCK_LINE); \ 331} while (0) 332 333/* 334 * Check if a buffer lock is recursed. 335 */ 336#define BUF_LOCKRECURSED(bp) \ 337 lockmgr_recursed(&(bp)->b_lock) 338 339/* 340 * Check if a buffer lock is currently held. 341 */ 342#define BUF_ISLOCKED(bp) \ 343 lockstatus(&(bp)->b_lock) 344 345/* 346 * Check if a buffer lock is currently held by LK_KERNPROC. 347 */ 348#define BUF_DISOWNED(bp) \ 349 lockmgr_disowned(&(bp)->b_lock) 350 351/* 352 * Free a buffer lock. 353 */ 354#define BUF_LOCKFREE(bp) \ 355 lockdestroy(&(bp)->b_lock) 356 357/* 358 * Print informations on a buffer lock. 359 */ 360#define BUF_LOCKPRINTINFO(bp) \ 361 lockmgr_printinfo(&(bp)->b_lock) 362 363/* 364 * Buffer lock assertions. 365 */ 366#if defined(INVARIANTS) && defined(INVARIANT_SUPPORT) 367#define BUF_ASSERT_LOCKED(bp) \ 368 _lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE) 369#define BUF_ASSERT_SLOCKED(bp) \ 370 _lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE) 371#define BUF_ASSERT_XLOCKED(bp) \ 372 _lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE) 373#define BUF_ASSERT_UNLOCKED(bp) \ 374 _lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE) 375#else 376#define BUF_ASSERT_LOCKED(bp) 377#define BUF_ASSERT_SLOCKED(bp) 378#define BUF_ASSERT_XLOCKED(bp) 379#define BUF_ASSERT_UNLOCKED(bp) 380#endif 381 382#ifdef _SYS_PROC_H_ /* Avoid #include <sys/proc.h> pollution */ 383/* 384 * When initiating asynchronous I/O, change ownership of the lock to the 385 * kernel. Once done, the lock may legally released by biodone. The 386 * original owning process can no longer acquire it recursively, but must 387 * wait until the I/O is completed and the lock has been freed by biodone. 388 */ 389#define BUF_KERNPROC(bp) \ 390 _lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE) 391#endif 392 393#endif /* _KERNEL */ 394 395struct buf_queue_head { 396 TAILQ_HEAD(buf_queue, buf) queue; 397 daddr_t last_pblkno; 398 struct buf *insert_point; 399 struct buf *switch_point; 400}; 401 402/* 403 * This structure describes a clustered I/O. 404 */ 405struct cluster_save { 406 long bs_bcount; /* Saved b_bcount. */ 407 long bs_bufsize; /* Saved b_bufsize. */ 408 int bs_nchildren; /* Number of associated buffers. */ 409 struct buf **bs_children; /* List of associated buffers. */ 410}; 411 412/* 413 * Vnode clustering tracker 414 */ 415struct vn_clusterw { 416 daddr_t v_cstart; /* v start block of cluster */ 417 daddr_t v_lasta; /* v last allocation */ 418 daddr_t v_lastw; /* v last write */ 419 int v_clen; /* v length of cur. cluster */ 420}; 421 422#ifdef _KERNEL 423 424static __inline int 425bwrite(struct buf *bp) 426{ 427 428 KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp)); 429 KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp)); 430 KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL, 431 ("bwrite: no bop_write bp=%p", bp)); 432 return (BO_WRITE(bp->b_bufobj, bp)); 433} 434 435static __inline void 436bstrategy(struct buf *bp) 437{ 438 439 KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp)); 440 KASSERT(bp->b_bufobj->bo_ops != NULL, 441 ("bstrategy: no bo_ops bp=%p", bp)); 442 KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL, 443 ("bstrategy: no bop_strategy bp=%p", bp)); 444 BO_STRATEGY(bp->b_bufobj, bp); 445} 446 447static __inline void 448buf_start(struct buf *bp) 449{ 450 KASSERT((bp->b_flags & B_IOSTARTED) == 0, 451 ("recursed buf_start %p", bp)); 452 bp->b_flags |= B_IOSTARTED; 453 if (bioops.io_start) 454 (*bioops.io_start)(bp); 455} 456 457static __inline void 458buf_complete(struct buf *bp) 459{ 460 if ((bp->b_flags & B_IOSTARTED) != 0) { 461 bp->b_flags &= ~B_IOSTARTED; 462 if (bioops.io_complete) 463 (*bioops.io_complete)(bp); 464 } 465} 466 467static __inline void 468buf_deallocate(struct buf *bp) 469{ 470 if (bioops.io_deallocate) 471 (*bioops.io_deallocate)(bp); 472} 473 474static __inline int 475buf_countdeps(struct buf *bp, int i) 476{ 477 if (bioops.io_countdeps) 478 return ((*bioops.io_countdeps)(bp, i)); 479 else 480 return (0); 481} 482 483static __inline void 484buf_track(struct buf *bp __unused, const char *location __unused) 485{ 486 487#if defined(FULL_BUF_TRACKING) 488 bp->b_io_tracking[BUF_TRACKING_ENTRY(bp->b_io_tcnt++)] = location; 489#elif defined(BUF_TRACKING) 490 bp->b_io_tracking = location; 491#endif 492} 493 494#endif /* _KERNEL */ 495 496/* 497 * Zero out the buffer's data area. 498 */ 499#define clrbuf(bp) { \ 500 bzero((bp)->b_data, (u_int)(bp)->b_bcount); \ 501 (bp)->b_resid = 0; \ 502} 503 504/* 505 * Flags for getblk's last parameter. 506 */ 507#define GB_LOCK_NOWAIT 0x0001 /* Fail if we block on a buf lock. */ 508#define GB_NOCREAT 0x0002 /* Don't create a buf if not found. */ 509#define GB_NOWAIT_BD 0x0004 /* Do not wait for bufdaemon. */ 510#define GB_UNMAPPED 0x0008 /* Do not mmap buffer pages. */ 511#define GB_KVAALLOC 0x0010 /* But allocate KVA. */ 512#define GB_CKHASH 0x0020 /* If reading, calc checksum hash */ 513#define GB_NOSPARSE 0x0040 /* Do not instantiate holes */ 514#define GB_CVTENXIO 0x0080 /* Convert errors to ENXIO */ 515#define GB_NOWITNESS 0x0100 /* Do not record for WITNESS */ 516 517#ifdef _KERNEL 518extern int nbuf; /* The number of buffer headers */ 519extern u_long maxswzone; /* Max KVA for swap structures */ 520extern u_long maxbcache; /* Max KVA for buffer cache */ 521extern int maxbcachebuf; /* Max buffer cache block size */ 522extern long runningbufspace; 523extern long hibufspace; 524extern int dirtybufthresh; 525extern int bdwriteskip; 526extern int dirtybufferflushes; 527extern int altbufferflushes; 528extern int nswbuf; /* Number of swap I/O buffer headers. */ 529extern caddr_t __read_mostly unmapped_buf; /* Data address for unmapped 530 buffers. */ 531 532static inline int 533buf_mapped(struct buf *bp) 534{ 535 536 return (bp->b_data != unmapped_buf); 537} 538 539void runningbufwakeup(struct buf *); 540void waitrunningbufspace(void); 541caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est); 542void bufinit(void); 543void bufshutdown(int); 544void bdata2bio(struct buf *bp, struct bio *bip); 545void bwillwrite(void); 546int buf_dirty_count_severe(void); 547void bremfree(struct buf *); 548void bremfreef(struct buf *); /* XXX Force bremfree, only for nfs. */ 549#define bread(vp, blkno, size, cred, bpp) \ 550 breadn_flags(vp, blkno, blkno, size, NULL, NULL, 0, cred, 0, \ 551 NULL, bpp) 552#define bread_gb(vp, blkno, size, cred, gbflags, bpp) \ 553 breadn_flags(vp, blkno, blkno, size, NULL, NULL, 0, cred, \ 554 gbflags, NULL, bpp) 555#define breadn(vp, blkno, size, rablkno, rabsize, cnt, cred, bpp) \ 556 breadn_flags(vp, blkno, blkno, size, rablkno, rabsize, cnt, cred, \ 557 0, NULL, bpp) 558int breadn_flags(struct vnode *, daddr_t, daddr_t, int, daddr_t *, int *, 559 int, struct ucred *, int, void (*)(struct buf *), struct buf **); 560void bdwrite(struct buf *); 561void bawrite(struct buf *); 562void babarrierwrite(struct buf *); 563int bbarrierwrite(struct buf *); 564void bdirty(struct buf *); 565void bundirty(struct buf *); 566void bufstrategy(struct bufobj *, struct buf *); 567void brelse(struct buf *); 568void bqrelse(struct buf *); 569int vfs_bio_awrite(struct buf *); 570void vfs_busy_pages_acquire(struct buf *bp); 571void vfs_busy_pages_release(struct buf *bp); 572struct buf *incore(struct bufobj *, daddr_t); 573bool inmem(struct vnode *, daddr_t); 574struct buf *gbincore(struct bufobj *, daddr_t); 575struct buf *gbincore_unlocked(struct bufobj *, daddr_t); 576struct buf *getblk(struct vnode *, daddr_t, int, int, int, int); 577int getblkx(struct vnode *vp, daddr_t blkno, daddr_t dblkno, int size, 578 int slpflag, int slptimeo, int flags, struct buf **bpp); 579struct buf *geteblk(int, int); 580int bufwait(struct buf *); 581int bufwrite(struct buf *); 582void bufdone(struct buf *); 583void bd_speedup(void); 584 585extern uma_zone_t pbuf_zone; 586uma_zone_t pbuf_zsecond_create(const char *name, int max); 587 588struct vn_clusterw; 589 590void cluster_init_vn(struct vn_clusterw *vnc); 591int cluster_read(struct vnode *, u_quad_t, daddr_t, long, 592 struct ucred *, long, int, int, struct buf **); 593int cluster_wbuild(struct vnode *, long, daddr_t, int, int); 594void cluster_write(struct vnode *, struct vn_clusterw *, struct buf *, 595 u_quad_t, int, int); 596void vfs_bio_brelse(struct buf *bp, int ioflags); 597void vfs_bio_bzero_buf(struct buf *bp, int base, int size); 598void vfs_bio_clrbuf(struct buf *); 599void vfs_bio_set_flags(struct buf *bp, int ioflags); 600void vfs_bio_set_valid(struct buf *, int base, int size); 601void vfs_busy_pages(struct buf *, int clear_modify); 602void vfs_unbusy_pages(struct buf *); 603int vmapbuf(struct buf *, void *, size_t, int); 604void vunmapbuf(struct buf *); 605void brelvp(struct buf *); 606int bgetvp(struct vnode *, struct buf *) __result_use_check; 607void pbgetbo(struct bufobj *bo, struct buf *bp); 608void pbgetvp(struct vnode *, struct buf *); 609void pbrelbo(struct buf *); 610void pbrelvp(struct buf *); 611int allocbuf(struct buf *bp, int size); 612void reassignbuf(struct buf *); 613void bwait(struct buf *, u_char, const char *); 614void bdone(struct buf *); 615 616typedef daddr_t (vbg_get_lblkno_t)(struct vnode *, vm_ooffset_t); 617typedef int (vbg_get_blksize_t)(struct vnode *, daddr_t, long *); 618int vfs_bio_getpages(struct vnode *vp, struct vm_page **ma, int count, 619 int *rbehind, int *rahead, vbg_get_lblkno_t get_lblkno, 620 vbg_get_blksize_t get_blksize); 621 622#endif /* _KERNEL */ 623 624#endif /* !_SYS_BUF_H_ */ 625