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/*
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* Copyright ( c ) 2000 - 2005 Silicon Graphics , Inc .
* All Rights Reserved .
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*
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* This program is free software ; you can redistribute it and / or
* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation .
*
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* 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 .
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*
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* 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
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*/
# 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
*/
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# 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 */
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XBF_LOG_BUFFER = ( 1 < < 13 ) , /* this is a buffer used for the log */
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/* flags used only as arguments to access routines */
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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 */
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/* flags used only internally */
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_XBF_PAGE_CACHE = ( 1 < < 17 ) , /* backed by pagecache */
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_XBF_PAGES = ( 1 < < 18 ) , /* backed by refcounted pages */
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_XBF_RUN_QUEUES = ( 1 < < 19 ) , /* run block device task queue */
_XBF_DELWRI_Q = ( 1 < < 21 ) , /* buffer on delwri queue */
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/*
* 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 ) ,
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/*
* 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 ) ,
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} xfs_buf_flags_t ;
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# define XFS_BUF_FLAGS \
{ XBF_READ , " READ " } , \
{ XBF_WRITE , " WRITE " } , \
{ XBF_MAPPED , " MAPPED " } , \
{ XBF_ASYNC , " ASYNC " } , \
{ XBF_DONE , " DONE " } , \
{ XBF_DELWRI , " DELWRI " } , \
{ XBF_STALE , " STALE " } , \
{ XBF_FS_MANAGED , " FS_MANAGED " } , \
{ XBF_ORDERED , " ORDERED " } , \
{ XBF_READ_AHEAD , " READ_AHEAD " } , \
{ XBF_LOCK , " LOCK " } , /* should never be set */ \
{ XBF_TRYLOCK , " TRYLOCK " } , /* ditto */ \
{ XBF_DONT_BLOCK , " DONT_BLOCK " } , /* ditto */ \
{ _XBF_PAGE_CACHE , " PAGE_CACHE " } , \
{ _XBF_PAGES , " PAGES " } , \
{ _XBF_RUN_QUEUES , " RUN_QUEUES " } , \
{ _XBF_DELWRI_Q , " DELWRI_Q " } , \
{ _XBF_PAGE_LOCKED , " PAGE_LOCKED " } , \
{ _XFS_BARRIER_FAILED , " BARRIER_FAILED " }
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typedef enum {
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XBT_FORCE_SLEEP = 0 ,
XBT_FORCE_FLUSH = 1 ,
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} xfs_buftarg_flags_t ;
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typedef struct xfs_bufhash {
struct list_head bh_list ;
spinlock_t bh_lock ;
} xfs_bufhash_t ;
typedef struct xfs_buftarg {
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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 */
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uint bt_hashmask ;
uint bt_hashshift ;
xfs_bufhash_t * bt_hash ;
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/* 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 ;
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unsigned long bt_flags ;
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} xfs_buftarg_t ;
/*
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* xfs_buf_t : Buffer structure for pagecache - based buffers
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*
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* 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
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* hashed to the block device on which the file system resides .
*/
struct xfs_buf ;
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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 * ) ;
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# define XB_PAGES 2
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typedef struct xfs_buf {
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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 */
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struct completion b_iowait ; /* queue for I/O waiters */
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void * b_fspriv ;
void * b_fspriv2 ;
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struct xfs_mount * b_mount ;
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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 ;
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# endif
} xfs_buf_t ;
/* Finding and Reading Buffers */
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extern xfs_buf_t * _xfs_buf_find ( xfs_buftarg_t * , xfs_off_t , size_t ,
xfs_buf_flags_t , xfs_buf_t * ) ;
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# define xfs_incore(buftarg,blkno,len,lockit) \
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_xfs_buf_find ( buftarg , blkno , len , lockit , NULL )
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extern xfs_buf_t * xfs_buf_get ( xfs_buftarg_t * , xfs_off_t , size_t ,
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xfs_buf_flags_t ) ;
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extern xfs_buf_t * xfs_buf_read ( xfs_buftarg_t * , xfs_off_t , size_t ,
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xfs_buf_flags_t ) ;
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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 ) ;
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/* Releasing Buffers */
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extern void xfs_buf_free ( xfs_buf_t * ) ;
extern void xfs_buf_rele ( xfs_buf_t * ) ;
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/* Locking and Unlocking Buffers */
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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 * ) ;
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/* Buffer Read and Write Routines */
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extern int xfs_bwrite ( struct xfs_mount * mp , struct xfs_buf * bp ) ;
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extern int xfs_bawrite ( void * mp , xfs_buf_t * bp ) ;
extern void xfs_bdwrite ( void * mp , xfs_buf_t * bp ) ;
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extern void xfsbdstrat ( struct xfs_mount * , struct xfs_buf * ) ;
extern int xfs_bdstrat_cb ( struct xfs_buf * ) ;
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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 * ) ;
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extern void xfs_buf_iomove ( xfs_buf_t * , size_t , size_t , void * ,
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xfs_buf_rw_t ) ;
static inline int xfs_buf_iostrategy ( xfs_buf_t * bp )
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{
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return bp - > b_strat ? bp - > b_strat ( bp ) : xfs_buf_iorequest ( bp ) ;
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}
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static inline int xfs_buf_geterror ( xfs_buf_t * bp )
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{
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return bp ? bp - > b_error : ENOMEM ;
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}
/* Buffer Utility Routines */
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extern xfs_caddr_t xfs_buf_offset ( xfs_buf_t * , size_t ) ;
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/* Pinning Buffer Storage in Memory */
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extern void xfs_buf_pin ( xfs_buf_t * ) ;
extern void xfs_buf_unpin ( xfs_buf_t * ) ;
extern int xfs_buf_ispin ( xfs_buf_t * ) ;
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/* Delayed Write Buffer Routines */
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extern void xfs_buf_delwri_dequeue ( xfs_buf_t * ) ;
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/* Buffer Daemon Setup Routines */
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extern int xfs_buf_init ( void ) ;
extern void xfs_buf_terminate ( void ) ;
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# define xfs_buf_target_name(target) \
( { char __b [ BDEVNAME_SIZE ] ; bdevname ( ( target ) - > bt_bdev , __b ) ; __b ; } )
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# define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
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# define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
~ ( XBF_READ | XBF_WRITE | XBF_ASYNC | XBF_DELWRI | XBF_ORDERED ) )
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# define XFS_BUF_STALE(bp) ((bp)->b_flags |= XBF_STALE)
# define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
# define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
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# define XFS_BUF_SUPER_STALE(bp) do { \
XFS_BUF_STALE ( bp ) ; \
xfs_buf_delwri_dequeue ( bp ) ; \
XFS_BUF_DONE ( bp ) ; \
} while ( 0 )
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# 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)
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# define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
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# 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 )
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{
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if ( ! bp - > b_relse )
xfs_buf_unlock ( bp ) ;
xfs_buf_rele ( bp ) ;
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}
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# define xfs_bpin(bp) xfs_buf_pin(bp)
# define xfs_bunpin(bp) xfs_buf_unpin(bp)
# define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
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# define xfs_biomove(bp, off, len, data, rw) \
xfs_buf_iomove ( ( bp ) , ( off ) , ( len ) , ( data ) , \
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( ( rw ) = = XBF_WRITE ) ? XBRW_WRITE : XBRW_READ )
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# define xfs_biozero(bp, off, len) \
xfs_buf_iomove ( ( bp ) , ( off ) , ( len ) , NULL , XBRW_ZERO )
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# define xfs_iowait(bp) xfs_buf_iowait(bp)
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# define xfs_baread(target, rablkno, ralen) \
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xfs_buf_readahead ( ( target ) , ( rablkno ) , ( ralen ) , XBF_DONT_BLOCK )
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/*
* Handling of buftargs .
*/
extern xfs_buftarg_t * xfs_alloc_buftarg ( struct block_device * , int ) ;
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extern void xfs_free_buftarg ( struct xfs_mount * , struct xfs_buftarg * ) ;
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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 ) ;
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# ifdef CONFIG_KDB_MODULES
extern struct list_head * xfs_get_buftarg_list ( void ) ;
# endif
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# 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)
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# endif /* __XFS_BUF_H__ */