431 lines
15 KiB
C
431 lines
15 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
||
|
|
* All Rights Reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it would be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write the Free Software Foundation,
|
||
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
#ifndef __XFS_BUF_H__
|
||
|
|
#define __XFS_BUF_H__
|
||
|
|
|
||
|
|
#include <linux/list.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
#include <linux/buffer_head.h>
|
||
|
|
#include <linux/uio.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Base types
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
|
||
|
|
|
||
|
|
#define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE)
|
||
|
|
#define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT)
|
||
|
|
#define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT)
|
||
|
|
#define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK)
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
XBRW_READ = 1, /* transfer into target memory */
|
||
|
|
XBRW_WRITE = 2, /* transfer from target memory */
|
||
|
|
XBRW_ZERO = 3, /* Zero target memory */
|
||
|
|
} xfs_buf_rw_t;
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
XBF_READ = (1 << 0), /* buffer intended for reading from device */
|
||
|
|
XBF_WRITE = (1 << 1), /* buffer intended for writing to device */
|
||
|
|
XBF_MAPPED = (1 << 2), /* buffer mapped (b_addr valid) */
|
||
|
|
XBF_ASYNC = (1 << 4), /* initiator will not wait for completion */
|
||
|
|
XBF_DONE = (1 << 5), /* all pages in the buffer uptodate */
|
||
|
|
XBF_DELWRI = (1 << 6), /* buffer has dirty pages */
|
||
|
|
XBF_STALE = (1 << 7), /* buffer has been staled, do not find it */
|
||
|
|
XBF_FS_MANAGED = (1 << 8), /* filesystem controls freeing memory */
|
||
|
|
XBF_ORDERED = (1 << 11), /* use ordered writes */
|
||
|
|
XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead */
|
||
|
|
|
||
|
|
/* flags used only as arguments to access routines */
|
||
|
|
XBF_LOCK = (1 << 14), /* lock requested */
|
||
|
|
XBF_TRYLOCK = (1 << 15), /* lock requested, but do not wait */
|
||
|
|
XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread */
|
||
|
|
|
||
|
|
/* flags used only internally */
|
||
|
|
_XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache */
|
||
|
|
_XBF_PAGES = (1 << 18), /* backed by refcounted pages */
|
||
|
|
_XBF_RUN_QUEUES = (1 << 19),/* run block device task queue */
|
||
|
|
_XBF_DELWRI_Q = (1 << 21), /* buffer on delwri queue */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Special flag for supporting metadata blocks smaller than a FSB.
|
||
|
|
*
|
||
|
|
* In this case we can have multiple xfs_buf_t on a single page and
|
||
|
|
* need to lock out concurrent xfs_buf_t readers as they only
|
||
|
|
* serialise access to the buffer.
|
||
|
|
*
|
||
|
|
* If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
|
||
|
|
* between reads of the page. Hence we can have one thread read the
|
||
|
|
* page and modify it, but then race with another thread that thinks
|
||
|
|
* the page is not up-to-date and hence reads it again.
|
||
|
|
*
|
||
|
|
* The result is that the first modifcation to the page is lost.
|
||
|
|
* This sort of AGF/AGI reading race can happen when unlinking inodes
|
||
|
|
* that require truncation and results in the AGI unlinked list
|
||
|
|
* modifications being lost.
|
||
|
|
*/
|
||
|
|
_XBF_PAGE_LOCKED = (1 << 22),
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If we try a barrier write, but it fails we have to communicate
|
||
|
|
* this to the upper layers. Unfortunately b_error gets overwritten
|
||
|
|
* when the buffer is re-issued so we have to add another flag to
|
||
|
|
* keep this information.
|
||
|
|
*/
|
||
|
|
_XFS_BARRIER_FAILED = (1 << 23),
|
||
|
|
} xfs_buf_flags_t;
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
XBT_FORCE_SLEEP = 0,
|
||
|
|
XBT_FORCE_FLUSH = 1,
|
||
|
|
} xfs_buftarg_flags_t;
|
||
|
|
|
||
|
|
typedef struct xfs_bufhash {
|
||
|
|
struct list_head bh_list;
|
||
|
|
spinlock_t bh_lock;
|
||
|
|
} xfs_bufhash_t;
|
||
|
|
|
||
|
|
typedef struct xfs_buftarg {
|
||
|
|
dev_t bt_dev;
|
||
|
|
struct block_device *bt_bdev;
|
||
|
|
struct address_space *bt_mapping;
|
||
|
|
unsigned int bt_bsize;
|
||
|
|
unsigned int bt_sshift;
|
||
|
|
size_t bt_smask;
|
||
|
|
|
||
|
|
/* per device buffer hash table */
|
||
|
|
uint bt_hashmask;
|
||
|
|
uint bt_hashshift;
|
||
|
|
xfs_bufhash_t *bt_hash;
|
||
|
|
|
||
|
|
/* per device delwri queue */
|
||
|
|
struct task_struct *bt_task;
|
||
|
|
struct list_head bt_list;
|
||
|
|
struct list_head bt_delwrite_queue;
|
||
|
|
spinlock_t bt_delwrite_lock;
|
||
|
|
unsigned long bt_flags;
|
||
|
|
} xfs_buftarg_t;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* xfs_buf_t: Buffer structure for pagecache-based buffers
|
||
|
|
*
|
||
|
|
* This buffer structure is used by the pagecache buffer management routines
|
||
|
|
* to refer to an assembly of pages forming a logical buffer.
|
||
|
|
*
|
||
|
|
* The buffer structure is used on a temporary basis only, and discarded when
|
||
|
|
* released. The real data storage is recorded in the pagecache. Buffers are
|
||
|
|
* hashed to the block device on which the file system resides.
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct xfs_buf;
|
||
|
|
typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
|
||
|
|
typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
|
||
|
|
typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
|
||
|
|
|
||
|
|
#define XB_PAGES 2
|
||
|
|
|
||
|
|
typedef struct xfs_buf {
|
||
|
|
struct semaphore b_sema; /* semaphore for lockables */
|
||
|
|
unsigned long b_queuetime; /* time buffer was queued */
|
||
|
|
atomic_t b_pin_count; /* pin count */
|
||
|
|
wait_queue_head_t b_waiters; /* unpin waiters */
|
||
|
|
struct list_head b_list;
|
||
|
|
xfs_buf_flags_t b_flags; /* status flags */
|
||
|
|
struct list_head b_hash_list; /* hash table list */
|
||
|
|
xfs_bufhash_t *b_hash; /* hash table list start */
|
||
|
|
xfs_buftarg_t *b_target; /* buffer target (device) */
|
||
|
|
atomic_t b_hold; /* reference count */
|
||
|
|
xfs_daddr_t b_bn; /* block number for I/O */
|
||
|
|
xfs_off_t b_file_offset; /* offset in file */
|
||
|
|
size_t b_buffer_length;/* size of buffer in bytes */
|
||
|
|
size_t b_count_desired;/* desired transfer size */
|
||
|
|
void *b_addr; /* virtual address of buffer */
|
||
|
|
struct work_struct b_iodone_work;
|
||
|
|
atomic_t b_io_remaining; /* #outstanding I/O requests */
|
||
|
|
xfs_buf_iodone_t b_iodone; /* I/O completion function */
|
||
|
|
xfs_buf_relse_t b_relse; /* releasing function */
|
||
|
|
xfs_buf_bdstrat_t b_strat; /* pre-write function */
|
||
|
|
struct completion b_iowait; /* queue for I/O waiters */
|
||
|
|
void *b_fspriv;
|
||
|
|
void *b_fspriv2;
|
||
|
|
struct xfs_mount *b_mount;
|
||
|
|
unsigned short b_error; /* error code on I/O */
|
||
|
|
unsigned int b_page_count; /* size of page array */
|
||
|
|
unsigned int b_offset; /* page offset in first page */
|
||
|
|
struct page **b_pages; /* array of page pointers */
|
||
|
|
struct page *b_page_array[XB_PAGES]; /* inline pages */
|
||
|
|
#ifdef XFS_BUF_LOCK_TRACKING
|
||
|
|
int b_last_holder;
|
||
|
|
#endif
|
||
|
|
} xfs_buf_t;
|
||
|
|
|
||
|
|
|
||
|
|
/* Finding and Reading Buffers */
|
||
|
|
extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
|
||
|
|
xfs_buf_flags_t, xfs_buf_t *);
|
||
|
|
#define xfs_incore(buftarg,blkno,len,lockit) \
|
||
|
|
_xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
|
||
|
|
|
||
|
|
extern xfs_buf_t *xfs_buf_get_flags(xfs_buftarg_t *, xfs_off_t, size_t,
|
||
|
|
xfs_buf_flags_t);
|
||
|
|
#define xfs_buf_get(target, blkno, len, flags) \
|
||
|
|
xfs_buf_get_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
|
||
|
|
|
||
|
|
extern xfs_buf_t *xfs_buf_read_flags(xfs_buftarg_t *, xfs_off_t, size_t,
|
||
|
|
xfs_buf_flags_t);
|
||
|
|
#define xfs_buf_read(target, blkno, len, flags) \
|
||
|
|
xfs_buf_read_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
|
||
|
|
|
||
|
|
extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
|
||
|
|
extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
|
||
|
|
extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
|
||
|
|
extern void xfs_buf_hold(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
|
||
|
|
xfs_buf_flags_t);
|
||
|
|
|
||
|
|
/* Releasing Buffers */
|
||
|
|
extern void xfs_buf_free(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_rele(xfs_buf_t *);
|
||
|
|
|
||
|
|
/* Locking and Unlocking Buffers */
|
||
|
|
extern int xfs_buf_cond_lock(xfs_buf_t *);
|
||
|
|
extern int xfs_buf_lock_value(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_lock(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_unlock(xfs_buf_t *);
|
||
|
|
|
||
|
|
/* Buffer Read and Write Routines */
|
||
|
|
extern int xfs_bawrite(void *mp, xfs_buf_t *bp);
|
||
|
|
extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
|
||
|
|
extern void xfs_buf_ioend(xfs_buf_t *, int);
|
||
|
|
extern void xfs_buf_ioerror(xfs_buf_t *, int);
|
||
|
|
extern int xfs_buf_iorequest(xfs_buf_t *);
|
||
|
|
extern int xfs_buf_iowait(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
|
||
|
|
xfs_buf_rw_t);
|
||
|
|
|
||
|
|
static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
|
||
|
|
{
|
||
|
|
return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int xfs_buf_geterror(xfs_buf_t *bp)
|
||
|
|
{
|
||
|
|
return bp ? bp->b_error : ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Buffer Utility Routines */
|
||
|
|
extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
|
||
|
|
|
||
|
|
/* Pinning Buffer Storage in Memory */
|
||
|
|
extern void xfs_buf_pin(xfs_buf_t *);
|
||
|
|
extern void xfs_buf_unpin(xfs_buf_t *);
|
||
|
|
extern int xfs_buf_ispin(xfs_buf_t *);
|
||
|
|
|
||
|
|
/* Delayed Write Buffer Routines */
|
||
|
|
extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
|
||
|
|
|
||
|
|
/* Buffer Daemon Setup Routines */
|
||
|
|
extern int xfs_buf_init(void);
|
||
|
|
extern void xfs_buf_terminate(void);
|
||
|
|
|
||
|
|
#ifdef XFS_BUF_TRACE
|
||
|
|
extern ktrace_t *xfs_buf_trace_buf;
|
||
|
|
extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
|
||
|
|
#else
|
||
|
|
#define xfs_buf_trace(bp,id,ptr,ra) do { } while (0)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define xfs_buf_target_name(target) \
|
||
|
|
({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
|
||
|
|
|
||
|
|
|
||
|
|
#define XFS_B_ASYNC XBF_ASYNC
|
||
|
|
#define XFS_B_DELWRI XBF_DELWRI
|
||
|
|
#define XFS_B_READ XBF_READ
|
||
|
|
#define XFS_B_WRITE XBF_WRITE
|
||
|
|
#define XFS_B_STALE XBF_STALE
|
||
|
|
|
||
|
|
#define XFS_BUF_TRYLOCK XBF_TRYLOCK
|
||
|
|
#define XFS_INCORE_TRYLOCK XBF_TRYLOCK
|
||
|
|
#define XFS_BUF_LOCK XBF_LOCK
|
||
|
|
#define XFS_BUF_MAPPED XBF_MAPPED
|
||
|
|
|
||
|
|
#define BUF_BUSY XBF_DONT_BLOCK
|
||
|
|
|
||
|
|
#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
|
||
|
|
#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
|
||
|
|
~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
|
||
|
|
|
||
|
|
#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XFS_B_STALE)
|
||
|
|
#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XFS_B_STALE)
|
||
|
|
#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XFS_B_STALE)
|
||
|
|
#define XFS_BUF_SUPER_STALE(bp) do { \
|
||
|
|
XFS_BUF_STALE(bp); \
|
||
|
|
xfs_buf_delwri_dequeue(bp); \
|
||
|
|
XFS_BUF_DONE(bp); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define XFS_BUF_MANAGE XBF_FS_MANAGED
|
||
|
|
#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
|
||
|
|
|
||
|
|
#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
|
||
|
|
#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
|
||
|
|
#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
|
||
|
|
|
||
|
|
#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
|
||
|
|
#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
|
||
|
|
#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
|
||
|
|
|
||
|
|
#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
|
||
|
|
#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
|
||
|
|
#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
|
||
|
|
|
||
|
|
#define XFS_BUF_BUSY(bp) do { } while (0)
|
||
|
|
#define XFS_BUF_UNBUSY(bp) do { } while (0)
|
||
|
|
#define XFS_BUF_ISBUSY(bp) (1)
|
||
|
|
|
||
|
|
#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
|
||
|
|
#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
|
||
|
|
#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
|
||
|
|
|
||
|
|
#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
|
||
|
|
#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
|
||
|
|
#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
|
||
|
|
|
||
|
|
#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
|
||
|
|
#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
|
||
|
|
#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
|
||
|
|
#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
|
||
|
|
|
||
|
|
#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
|
||
|
|
#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
|
||
|
|
#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
|
||
|
|
|
||
|
|
#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
|
||
|
|
#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
|
||
|
|
#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
|
||
|
|
#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func))
|
||
|
|
#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL)
|
||
|
|
|
||
|
|
#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
|
||
|
|
#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
|
||
|
|
#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
|
||
|
|
#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
|
||
|
|
#define XFS_BUF_SET_START(bp) do { } while (0)
|
||
|
|
#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
|
||
|
|
|
||
|
|
#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
|
||
|
|
#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
|
||
|
|
#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
|
||
|
|
#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
|
||
|
|
#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
|
||
|
|
#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
|
||
|
|
#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
|
||
|
|
#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
|
||
|
|
#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
|
||
|
|
#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
|
||
|
|
|
||
|
|
#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
|
||
|
|
#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
|
||
|
|
#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
|
||
|
|
|
||
|
|
#define XFS_BUF_ISPINNED(bp) xfs_buf_ispin(bp)
|
||
|
|
|
||
|
|
#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
|
||
|
|
#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
|
||
|
|
#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
|
||
|
|
#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
|
||
|
|
#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
|
||
|
|
|
||
|
|
#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
|
||
|
|
#define XFS_BUF_TARGET(bp) ((bp)->b_target)
|
||
|
|
#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
|
||
|
|
|
||
|
|
static inline void xfs_buf_relse(xfs_buf_t *bp)
|
||
|
|
{
|
||
|
|
if (!bp->b_relse)
|
||
|
|
xfs_buf_unlock(bp);
|
||
|
|
xfs_buf_rele(bp);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define xfs_bpin(bp) xfs_buf_pin(bp)
|
||
|
|
#define xfs_bunpin(bp) xfs_buf_unpin(bp)
|
||
|
|
|
||
|
|
#define xfs_buftrace(id, bp) \
|
||
|
|
xfs_buf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
|
||
|
|
|
||
|
|
#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
|
||
|
|
|
||
|
|
#define xfs_biomove(bp, off, len, data, rw) \
|
||
|
|
xfs_buf_iomove((bp), (off), (len), (data), \
|
||
|
|
((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ)
|
||
|
|
|
||
|
|
#define xfs_biozero(bp, off, len) \
|
||
|
|
xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
|
||
|
|
|
||
|
|
|
||
|
|
static inline int XFS_bwrite(xfs_buf_t *bp)
|
||
|
|
{
|
||
|
|
int iowait = (bp->b_flags & XBF_ASYNC) == 0;
|
||
|
|
int error = 0;
|
||
|
|
|
||
|
|
if (!iowait)
|
||
|
|
bp->b_flags |= _XBF_RUN_QUEUES;
|
||
|
|
|
||
|
|
xfs_buf_delwri_dequeue(bp);
|
||
|
|
xfs_buf_iostrategy(bp);
|
||
|
|
if (iowait) {
|
||
|
|
error = xfs_buf_iowait(bp);
|
||
|
|
xfs_buf_relse(bp);
|
||
|
|
}
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
|
||
|
|
|
||
|
|
#define xfs_iowait(bp) xfs_buf_iowait(bp)
|
||
|
|
|
||
|
|
#define xfs_baread(target, rablkno, ralen) \
|
||
|
|
xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Handling of buftargs.
|
||
|
|
*/
|
||
|
|
extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
|
||
|
|
extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
|
||
|
|
extern void xfs_wait_buftarg(xfs_buftarg_t *);
|
||
|
|
extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
|
||
|
|
extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
|
||
|
|
#ifdef CONFIG_KDB_MODULES
|
||
|
|
extern struct list_head *xfs_get_buftarg_list(void);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
|
||
|
|
#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
|
||
|
|
|
||
|
|
#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
|
||
|
|
#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
|
||
|
|
|
||
|
|
#endif /* __XFS_BUF_H__ */
|