e25f6a560e
shared busy without first draining the hard busy state. Previously it went unnoticed since VPO_BUSY and m->busy fields were distinct, and vm_page_io_start() did not verified that the passed page has VPO_BUSY flag cleared, but such page state is wrong. New implementation is more strict and catched this case. Drain the busy state as needed, before calling vm_page_sbusy(). Tested by: pho, jkim Sponsored by: The FreeBSD Foundation
546 lines
19 KiB
C
546 lines
19 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)buf.h 8.9 (Berkeley) 3/30/95
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_BUF_H_
|
|
#define _SYS_BUF_H_
|
|
|
|
#include <sys/bufobj.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/lockmgr.h>
|
|
|
|
struct bio;
|
|
struct buf;
|
|
struct bufobj;
|
|
struct mount;
|
|
struct vnode;
|
|
struct uio;
|
|
|
|
/*
|
|
* To avoid including <ufs/ffs/softdep.h>
|
|
*/
|
|
LIST_HEAD(workhead, worklist);
|
|
/*
|
|
* These are currently used only by the soft dependency code, hence
|
|
* are stored once in a global variable. If other subsystems wanted
|
|
* to use these hooks, a pointer to a set of bio_ops could be added
|
|
* to each buffer.
|
|
*/
|
|
extern struct bio_ops {
|
|
void (*io_start)(struct buf *);
|
|
void (*io_complete)(struct buf *);
|
|
void (*io_deallocate)(struct buf *);
|
|
int (*io_countdeps)(struct buf *, int);
|
|
} bioops;
|
|
|
|
struct vm_object;
|
|
|
|
typedef unsigned char b_xflags_t;
|
|
|
|
/*
|
|
* The buffer header describes an I/O operation in the kernel.
|
|
*
|
|
* NOTES:
|
|
* b_bufsize, b_bcount. b_bufsize is the allocation size of the
|
|
* buffer, either DEV_BSIZE or PAGE_SIZE aligned. b_bcount is the
|
|
* originally requested buffer size and can serve as a bounds check
|
|
* against EOF. For most, but not all uses, b_bcount == b_bufsize.
|
|
*
|
|
* b_dirtyoff, b_dirtyend. Buffers support piecemeal, unaligned
|
|
* ranges of dirty data that need to be written to backing store.
|
|
* The range is typically clipped at b_bcount ( not b_bufsize ).
|
|
*
|
|
* b_resid. Number of bytes remaining in I/O. After an I/O operation
|
|
* completes, b_resid is usually 0 indicating 100% success.
|
|
*
|
|
* All fields are protected by the buffer lock except those marked:
|
|
* V - Protected by owning bufobj lock
|
|
* Q - Protected by the buf queue lock
|
|
* D - Protected by an dependency implementation specific lock
|
|
*/
|
|
struct buf {
|
|
struct bufobj *b_bufobj;
|
|
long b_bcount;
|
|
void *b_caller1;
|
|
caddr_t b_data;
|
|
int b_error;
|
|
uint8_t b_iocmd;
|
|
uint8_t b_ioflags;
|
|
off_t b_iooffset;
|
|
long b_resid;
|
|
void (*b_iodone)(struct buf *);
|
|
daddr_t b_blkno; /* Underlying physical block number. */
|
|
off_t b_offset; /* Offset into file. */
|
|
TAILQ_ENTRY(buf) b_bobufs; /* (V) Buffer's associated vnode. */
|
|
uint32_t b_vflags; /* (V) BV_* flags */
|
|
TAILQ_ENTRY(buf) b_freelist; /* (Q) Free list position inactive. */
|
|
unsigned short b_qindex; /* (Q) buffer queue index */
|
|
uint32_t b_flags; /* B_* flags. */
|
|
b_xflags_t b_xflags; /* extra flags */
|
|
struct lock b_lock; /* Buffer lock */
|
|
long b_bufsize; /* Allocated buffer size. */
|
|
long b_runningbufspace; /* when I/O is running, pipelining */
|
|
caddr_t b_kvabase; /* base kva for buffer */
|
|
caddr_t b_kvaalloc; /* allocated kva for B_KVAALLOC */
|
|
int b_kvasize; /* size of kva for buffer */
|
|
daddr_t b_lblkno; /* Logical block number. */
|
|
struct vnode *b_vp; /* Device vnode. */
|
|
int b_dirtyoff; /* Offset in buffer of dirty region. */
|
|
int b_dirtyend; /* Offset of end of dirty region. */
|
|
struct ucred *b_rcred; /* Read credentials reference. */
|
|
struct ucred *b_wcred; /* Write credentials reference. */
|
|
void *b_saveaddr; /* Original b_addr for physio. */
|
|
union pager_info {
|
|
int pg_reqpage;
|
|
} b_pager;
|
|
union cluster_info {
|
|
TAILQ_HEAD(cluster_list_head, buf) cluster_head;
|
|
TAILQ_ENTRY(buf) cluster_entry;
|
|
} b_cluster;
|
|
struct vm_page *b_pages[btoc(MAXPHYS)];
|
|
int b_npages;
|
|
struct workhead b_dep; /* (D) List of filesystem dependencies. */
|
|
void *b_fsprivate1;
|
|
void *b_fsprivate2;
|
|
void *b_fsprivate3;
|
|
int b_pin_count;
|
|
};
|
|
|
|
#define b_object b_bufobj->bo_object
|
|
|
|
/*
|
|
* These flags are kept in b_flags.
|
|
*
|
|
* Notes:
|
|
*
|
|
* B_ASYNC VOP calls on bp's are usually async whether or not
|
|
* B_ASYNC is set, but some subsystems, such as NFS, like
|
|
* to know what is best for the caller so they can
|
|
* optimize the I/O.
|
|
*
|
|
* B_PAGING Indicates that bp is being used by the paging system or
|
|
* some paging system and that the bp is not linked into
|
|
* the b_vp's clean/dirty linked lists or ref counts.
|
|
* Buffer vp reassignments are illegal in this case.
|
|
*
|
|
* B_CACHE This may only be set if the buffer is entirely valid.
|
|
* The situation where B_DELWRI is set and B_CACHE is
|
|
* clear MUST be committed to disk by getblk() so
|
|
* B_DELWRI can also be cleared. See the comments for
|
|
* getblk() in kern/vfs_bio.c. If B_CACHE is clear,
|
|
* the caller is expected to clear BIO_ERROR and B_INVAL,
|
|
* set BIO_READ, and initiate an I/O.
|
|
*
|
|
* The 'entire buffer' is defined to be the range from
|
|
* 0 through b_bcount.
|
|
*
|
|
* B_MALLOC Request that the buffer be allocated from the malloc
|
|
* pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned.
|
|
*
|
|
* B_CLUSTEROK This flag is typically set for B_DELWRI buffers
|
|
* by filesystems that allow clustering when the buffer
|
|
* is fully dirty and indicates that it may be clustered
|
|
* with other adjacent dirty buffers. Note the clustering
|
|
* may not be used with the stage 1 data write under NFS
|
|
* but may be used for the commit rpc portion.
|
|
*
|
|
* B_VMIO Indicates that the buffer is tied into an VM object.
|
|
* The buffer's data is always PAGE_SIZE aligned even
|
|
* if b_bufsize and b_bcount are not. ( b_bufsize is
|
|
* always at least DEV_BSIZE aligned, though ).
|
|
*
|
|
* B_DIRECT Hint that we should attempt to completely free
|
|
* the pages underlying the buffer. B_DIRECT is
|
|
* sticky until the buffer is released and typically
|
|
* only has an effect when B_RELBUF is also set.
|
|
*
|
|
*/
|
|
|
|
#define B_AGE 0x00000001 /* Move to age queue when I/O done. */
|
|
#define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */
|
|
#define B_ASYNC 0x00000004 /* Start I/O, do not wait. */
|
|
#define B_DIRECT 0x00000008 /* direct I/O flag (pls free vmio) */
|
|
#define B_DEFERRED 0x00000010 /* Skipped over for cleaning */
|
|
#define B_CACHE 0x00000020 /* Bread found us in the cache. */
|
|
#define B_VALIDSUSPWRT 0x00000040 /* Valid write during suspension. */
|
|
#define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */
|
|
#define B_PERSISTENT 0x00000100 /* Perm. ref'ed while EXT2FS mounted. */
|
|
#define B_DONE 0x00000200 /* I/O completed. */
|
|
#define B_EINTR 0x00000400 /* I/O was interrupted */
|
|
#define B_UNMAPPED 0x00000800 /* KVA is not mapped. */
|
|
#define B_KVAALLOC 0x00001000 /* But allocated. */
|
|
#define B_INVAL 0x00002000 /* Does not contain valid info. */
|
|
#define B_BARRIER 0x00004000 /* Write this and all preceeding first. */
|
|
#define B_NOCACHE 0x00008000 /* Do not cache block after use. */
|
|
#define B_MALLOC 0x00010000 /* malloced b_data */
|
|
#define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */
|
|
#define B_000400000 0x00040000 /* Available flag. */
|
|
#define B_000800000 0x00080000 /* Available flag. */
|
|
#define B_00100000 0x00100000 /* Available flag. */
|
|
#define B_DIRTY 0x00200000 /* Needs writing later (in EXT2FS). */
|
|
#define B_RELBUF 0x00400000 /* Release VMIO buffer. */
|
|
#define B_00800000 0x00800000 /* Available flag. */
|
|
#define B_NOCOPY 0x01000000 /* Don't copy-on-write this buf. */
|
|
#define B_INFREECNT 0x02000000 /* buf is counted in numfreebufs */
|
|
#define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */
|
|
#define B_MANAGED 0x08000000 /* Managed by FS. */
|
|
#define B_RAM 0x10000000 /* Read ahead mark (flag) */
|
|
#define B_VMIO 0x20000000 /* VMIO flag */
|
|
#define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */
|
|
#define B_REMFREE 0x80000000 /* Delayed bremfree */
|
|
|
|
#define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34managed" \
|
|
"\33paging\32infreecnt\31nocopy\30b23\27relbuf\26dirty\25b20" \
|
|
"\24b19\23b18\22clusterok\21malloc\20nocache\17b14\16inval" \
|
|
"\15b12\14b11\13eintr\12done\11persist\10delwri\7validsuspwrt" \
|
|
"\6cache\5deferred\4direct\3async\2needcommit\1age"
|
|
|
|
/*
|
|
* These flags are kept in b_xflags.
|
|
*/
|
|
#define BX_VNDIRTY 0x00000001 /* On vnode dirty list */
|
|
#define BX_VNCLEAN 0x00000002 /* On vnode clean list */
|
|
#define BX_BKGRDWRITE 0x00000010 /* Do writes in background */
|
|
#define BX_BKGRDMARKER 0x00000020 /* Mark buffer for splay tree */
|
|
#define BX_ALTDATA 0x00000040 /* Holds extended data */
|
|
|
|
#define PRINT_BUF_XFLAGS "\20\7altdata\6bkgrdmarker\5bkgrdwrite\2clean\1dirty"
|
|
|
|
#define NOOFFSET (-1LL) /* No buffer offset calculated yet */
|
|
|
|
/*
|
|
* These flags are kept in b_vflags.
|
|
*/
|
|
#define BV_SCANNED 0x00000001 /* VOP_FSYNC funcs mark written bufs */
|
|
#define BV_BKGRDINPROG 0x00000002 /* Background write in progress */
|
|
#define BV_BKGRDWAIT 0x00000004 /* Background write waiting */
|
|
|
|
#define PRINT_BUF_VFLAGS "\20\3bkgrdwait\2bkgrdinprog\1scanned"
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Buffer locking
|
|
*/
|
|
extern const char *buf_wmesg; /* Default buffer lock message */
|
|
#define BUF_WMESG "bufwait"
|
|
#include <sys/proc.h> /* XXX for curthread */
|
|
#include <sys/mutex.h>
|
|
|
|
/*
|
|
* Initialize a lock.
|
|
*/
|
|
#define BUF_LOCKINIT(bp) \
|
|
lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, 0)
|
|
/*
|
|
*
|
|
* Get a lock sleeping non-interruptably until it becomes available.
|
|
*/
|
|
#define BUF_LOCK(bp, locktype, interlock) \
|
|
_lockmgr_args_rw(&(bp)->b_lock, (locktype), (interlock), \
|
|
LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \
|
|
LOCK_FILE, LOCK_LINE)
|
|
|
|
/*
|
|
* Get a lock sleeping with specified interruptably and timeout.
|
|
*/
|
|
#define BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo) \
|
|
_lockmgr_args_rw(&(bp)->b_lock, (locktype) | LK_TIMELOCK, \
|
|
(interlock), (wmesg), (PRIBIO + 4) | (catch), (timo), \
|
|
LOCK_FILE, LOCK_LINE)
|
|
|
|
/*
|
|
* Release a lock. Only the acquiring process may free the lock unless
|
|
* it has been handed off to biodone.
|
|
*/
|
|
#define BUF_UNLOCK(bp) do { \
|
|
KASSERT(((bp)->b_flags & B_REMFREE) == 0, \
|
|
("BUF_UNLOCK %p while B_REMFREE is still set.", (bp))); \
|
|
\
|
|
(void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL, \
|
|
LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, \
|
|
LOCK_FILE, LOCK_LINE); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Check if a buffer lock is recursed.
|
|
*/
|
|
#define BUF_LOCKRECURSED(bp) \
|
|
lockmgr_recursed(&(bp)->b_lock)
|
|
|
|
/*
|
|
* Check if a buffer lock is currently held.
|
|
*/
|
|
#define BUF_ISLOCKED(bp) \
|
|
lockstatus(&(bp)->b_lock)
|
|
/*
|
|
* Free a buffer lock.
|
|
*/
|
|
#define BUF_LOCKFREE(bp) \
|
|
lockdestroy(&(bp)->b_lock)
|
|
|
|
/*
|
|
* Print informations on a buffer lock.
|
|
*/
|
|
#define BUF_LOCKPRINTINFO(bp) \
|
|
lockmgr_printinfo(&(bp)->b_lock)
|
|
|
|
/*
|
|
* Buffer lock assertions.
|
|
*/
|
|
#if defined(INVARIANTS) && defined(INVARIANT_SUPPORT)
|
|
#define BUF_ASSERT_LOCKED(bp) \
|
|
_lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE)
|
|
#define BUF_ASSERT_SLOCKED(bp) \
|
|
_lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE)
|
|
#define BUF_ASSERT_XLOCKED(bp) \
|
|
_lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE)
|
|
#define BUF_ASSERT_UNLOCKED(bp) \
|
|
_lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE)
|
|
#define BUF_ASSERT_HELD(bp)
|
|
#define BUF_ASSERT_UNHELD(bp)
|
|
#else
|
|
#define BUF_ASSERT_LOCKED(bp)
|
|
#define BUF_ASSERT_SLOCKED(bp)
|
|
#define BUF_ASSERT_XLOCKED(bp)
|
|
#define BUF_ASSERT_UNLOCKED(bp)
|
|
#define BUF_ASSERT_HELD(bp)
|
|
#define BUF_ASSERT_UNHELD(bp)
|
|
#endif
|
|
|
|
#ifdef _SYS_PROC_H_ /* Avoid #include <sys/proc.h> pollution */
|
|
/*
|
|
* When initiating asynchronous I/O, change ownership of the lock to the
|
|
* kernel. Once done, the lock may legally released by biodone. The
|
|
* original owning process can no longer acquire it recursively, but must
|
|
* wait until the I/O is completed and the lock has been freed by biodone.
|
|
*/
|
|
#define BUF_KERNPROC(bp) \
|
|
_lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE)
|
|
#endif
|
|
|
|
/*
|
|
* Find out if the lock has waiters or not.
|
|
*/
|
|
#define BUF_LOCKWAITERS(bp) \
|
|
lockmgr_waiters(&(bp)->b_lock)
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
struct buf_queue_head {
|
|
TAILQ_HEAD(buf_queue, buf) queue;
|
|
daddr_t last_pblkno;
|
|
struct buf *insert_point;
|
|
struct buf *switch_point;
|
|
};
|
|
|
|
/*
|
|
* This structure describes a clustered I/O. It is stored in the b_saveaddr
|
|
* field of the buffer on which I/O is done. At I/O completion, cluster
|
|
* callback uses the structure to parcel I/O's to individual buffers, and
|
|
* then free's this structure.
|
|
*/
|
|
struct cluster_save {
|
|
long bs_bcount; /* Saved b_bcount. */
|
|
long bs_bufsize; /* Saved b_bufsize. */
|
|
void *bs_saveaddr; /* Saved b_addr. */
|
|
int bs_nchildren; /* Number of associated buffers. */
|
|
struct buf **bs_children; /* List of associated buffers. */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
static __inline int
|
|
bwrite(struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp));
|
|
KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp));
|
|
KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL,
|
|
("bwrite: no bop_write bp=%p", bp));
|
|
return (BO_WRITE(bp->b_bufobj, bp));
|
|
}
|
|
|
|
static __inline void
|
|
bstrategy(struct buf *bp)
|
|
{
|
|
|
|
KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp));
|
|
KASSERT(bp->b_bufobj->bo_ops != NULL,
|
|
("bstrategy: no bo_ops bp=%p", bp));
|
|
KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL,
|
|
("bstrategy: no bop_strategy bp=%p", bp));
|
|
BO_STRATEGY(bp->b_bufobj, bp);
|
|
}
|
|
|
|
static __inline void
|
|
buf_start(struct buf *bp)
|
|
{
|
|
if (bioops.io_start)
|
|
(*bioops.io_start)(bp);
|
|
}
|
|
|
|
static __inline void
|
|
buf_complete(struct buf *bp)
|
|
{
|
|
if (bioops.io_complete)
|
|
(*bioops.io_complete)(bp);
|
|
}
|
|
|
|
static __inline void
|
|
buf_deallocate(struct buf *bp)
|
|
{
|
|
if (bioops.io_deallocate)
|
|
(*bioops.io_deallocate)(bp);
|
|
}
|
|
|
|
static __inline int
|
|
buf_countdeps(struct buf *bp, int i)
|
|
{
|
|
if (bioops.io_countdeps)
|
|
return ((*bioops.io_countdeps)(bp, i));
|
|
else
|
|
return (0);
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Zero out the buffer's data area.
|
|
*/
|
|
#define clrbuf(bp) { \
|
|
bzero((bp)->b_data, (u_int)(bp)->b_bcount); \
|
|
(bp)->b_resid = 0; \
|
|
}
|
|
|
|
/*
|
|
* Flags for getblk's last parameter.
|
|
*/
|
|
#define GB_LOCK_NOWAIT 0x0001 /* Fail if we block on a buf lock. */
|
|
#define GB_NOCREAT 0x0002 /* Don't create a buf if not found. */
|
|
#define GB_NOWAIT_BD 0x0004 /* Do not wait for bufdaemon. */
|
|
#define GB_UNMAPPED 0x0008 /* Do not mmap buffer pages. */
|
|
#define GB_KVAALLOC 0x0010 /* But allocate KVA. */
|
|
|
|
#ifdef _KERNEL
|
|
extern int nbuf; /* The number of buffer headers */
|
|
extern long maxswzone; /* Max KVA for swap structures */
|
|
extern long maxbcache; /* Max KVA for buffer cache */
|
|
extern long runningbufspace;
|
|
extern long hibufspace;
|
|
extern int dirtybufthresh;
|
|
extern int bdwriteskip;
|
|
extern int dirtybufferflushes;
|
|
extern int altbufferflushes;
|
|
extern struct buf *buf; /* The buffer headers. */
|
|
extern struct buf *swbuf; /* Swap I/O buffer headers. */
|
|
extern int nswbuf; /* Number of swap I/O buffer headers. */
|
|
extern int cluster_pbuf_freecnt; /* Number of pbufs for clusters */
|
|
extern int vnode_pbuf_freecnt; /* Number of pbufs for vnode pager */
|
|
extern caddr_t unmapped_buf;
|
|
|
|
void runningbufwakeup(struct buf *);
|
|
void waitrunningbufspace(void);
|
|
caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est);
|
|
void bufinit(void);
|
|
void bdata2bio(struct buf *bp, struct bio *bip);
|
|
void bwillwrite(void);
|
|
int buf_dirty_count_severe(void);
|
|
void bremfree(struct buf *);
|
|
void bremfreef(struct buf *); /* XXX Force bremfree, only for nfs. */
|
|
#define bread(vp, blkno, size, cred, bpp) \
|
|
breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, 0, bpp)
|
|
#define bread_gb(vp, blkno, size, cred, gbflags, bpp) \
|
|
breadn_flags(vp, blkno, size, NULL, NULL, 0, cred, \
|
|
gbflags, bpp)
|
|
#define breadn(vp, blkno, size, rablkno, rabsize, cnt, cred, bpp) \
|
|
breadn_flags(vp, blkno, size, rablkno, rabsize, cnt, cred, 0, bpp)
|
|
int breadn_flags(struct vnode *, daddr_t, int, daddr_t *, int *, int,
|
|
struct ucred *, int, struct buf **);
|
|
void breada(struct vnode *, daddr_t *, int *, int, struct ucred *);
|
|
void bdwrite(struct buf *);
|
|
void bawrite(struct buf *);
|
|
void babarrierwrite(struct buf *);
|
|
int bbarrierwrite(struct buf *);
|
|
void bdirty(struct buf *);
|
|
void bundirty(struct buf *);
|
|
void bufstrategy(struct bufobj *, struct buf *);
|
|
void brelse(struct buf *);
|
|
void bqrelse(struct buf *);
|
|
int vfs_bio_awrite(struct buf *);
|
|
void vfs_drain_busy_pages(struct buf *bp);
|
|
struct buf * getpbuf(int *);
|
|
struct buf *incore(struct bufobj *, daddr_t);
|
|
struct buf *gbincore(struct bufobj *, daddr_t);
|
|
struct buf *getblk(struct vnode *, daddr_t, int, int, int, int);
|
|
struct buf *geteblk(int, int);
|
|
int bufwait(struct buf *);
|
|
int bufwrite(struct buf *);
|
|
void bufdone(struct buf *);
|
|
void bufdone_finish(struct buf *);
|
|
void bd_speedup(void);
|
|
|
|
int cluster_read(struct vnode *, u_quad_t, daddr_t, long,
|
|
struct ucred *, long, int, int, struct buf **);
|
|
int cluster_wbuild(struct vnode *, long, daddr_t, int, int);
|
|
void cluster_write(struct vnode *, struct buf *, u_quad_t, int, int);
|
|
void vfs_bio_bzero_buf(struct buf *bp, int base, int size);
|
|
void vfs_bio_set_valid(struct buf *, int base, int size);
|
|
void vfs_bio_clrbuf(struct buf *);
|
|
void vfs_busy_pages(struct buf *, int clear_modify);
|
|
void vfs_unbusy_pages(struct buf *);
|
|
int vmapbuf(struct buf *, int);
|
|
void vunmapbuf(struct buf *);
|
|
void relpbuf(struct buf *, int *);
|
|
void brelvp(struct buf *);
|
|
void bgetvp(struct vnode *, struct buf *);
|
|
void pbgetbo(struct bufobj *bo, struct buf *bp);
|
|
void pbgetvp(struct vnode *, struct buf *);
|
|
void pbrelbo(struct buf *);
|
|
void pbrelvp(struct buf *);
|
|
int allocbuf(struct buf *bp, int size);
|
|
void reassignbuf(struct buf *);
|
|
struct buf *trypbuf(int *);
|
|
void bwait(struct buf *, u_char, const char *);
|
|
void bdone(struct buf *);
|
|
void bpin(struct buf *);
|
|
void bunpin(struct buf *);
|
|
void bunpin_wait(struct buf *);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_SYS_BUF_H_ */
|