fs/xfs/linux-2.6/xfs_buf.h

   1 /*
   2  * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 /*
  34  * Written by Steve Lord, Jim Mostek, Russell Cattelan at SGI
  35  */
  36
  37 #ifndef __XFS_BUF_H__
  38 #define __XFS_BUF_H__
  39
  40 #include <linux/config.h>
  41 #include <linux/list.h>
  42 #include <linux/types.h>
  43 #include <linux/spinlock.h>
  44 #include <asm/system.h>
  45 #include <linux/mm.h>
  46 #include <linux/fs.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/uio.h>
  49
  50 /*
  51  *      Base types
  52  */
  53
  54 #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
  55
  56 #define page_buf_ctob(pp)       ((pp) * PAGE_CACHE_SIZE)
  57 #define page_buf_btoc(dd)       (((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
  58 #define page_buf_btoct(dd)      ((dd) >> PAGE_CACHE_SHIFT)
  59 #define page_buf_poff(aa)       ((aa) & ~PAGE_CACHE_MASK)
  60
  61 typedef enum page_buf_rw_e {
  62         PBRW_READ = 1,                  /* transfer into target memory */
  63         PBRW_WRITE = 2,                 /* transfer from target memory */
  64         PBRW_ZERO = 3                   /* Zero target memory */
  65 } page_buf_rw_t;
  66
  67
  68 typedef enum page_buf_flags_e {         /* pb_flags values */
  69         PBF_READ = (1 << 0),    /* buffer intended for reading from device */
  70         PBF_WRITE = (1 << 1),   /* buffer intended for writing to device   */
  71         PBF_MAPPED = (1 << 2),  /* buffer mapped (pb_addr valid)           */
  72         PBF_PARTIAL = (1 << 3), /* buffer partially read                   */
  73         PBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
  74         PBF_NONE = (1 << 5),    /* buffer not read at all                  */
  75         PBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
  76         PBF_STALE = (1 << 7),   /* buffer has been staled, do not find it  */
  77         PBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
  78         PBF_FS_DATAIOD = (1 << 9),  /* schedule IO completion on fs datad  */
  79         PBF_FORCEIO = (1 << 10),    /* ignore any cache state              */
  80         PBF_FLUSH = (1 << 11),      /* flush disk write cache              */
  81         PBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead             */
  82
  83         /* flags used only as arguments to access routines */
  84         PBF_LOCK = (1 << 14),       /* lock requested                      */
  85         PBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait     */
  86         PBF_DONT_BLOCK = (1 << 16), /* do not block in current thread      */
  87
  88         /* flags used only internally */
  89         _PBF_PAGE_CACHE = (1 << 17),/* backed by pagecache                 */
  90         _PBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()              */
  91         _PBF_RUN_QUEUES = (1 << 19),/* run block device task queue         */
  92 } page_buf_flags_t;
  93
  94 #define PBF_UPDATE (PBF_READ | PBF_WRITE)
  95 #define PBF_NOT_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) != 0)
  96 #define PBF_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) == 0)
  97
  98 typedef struct xfs_bufhash {
  99         struct list_head        bh_list;
 100         spinlock_t              bh_lock;
 101 } xfs_bufhash_t;
 102
 103 typedef struct xfs_buftarg {
 104         dev_t                   pbr_dev;
 105         struct block_device     *pbr_bdev;
 106         struct address_space    *pbr_mapping;
 107         unsigned int            pbr_bsize;
 108         unsigned int            pbr_sshift;
 109         size_t                  pbr_smask;
 110
 111         /* per-device buffer hash table */
 112         uint                    bt_hashmask;
 113         uint                    bt_hashshift;
 114         xfs_bufhash_t           *bt_hash;
 115 } xfs_buftarg_t;
 116
 117 /*
 118  *      xfs_buf_t:  Buffer structure for page cache-based buffers
 119  *
 120  * This buffer structure is used by the page cache buffer management routines
 121  * to refer to an assembly of pages forming a logical buffer.  The actual I/O
 122  * is performed with buffer_head structures, as required by drivers.
 123  *
 124  * The buffer structure is used on temporary basis only, and discarded when
 125  * released.  The real data storage is recorded in the page cache.  Metadata is
 126  * hashed to the block device on which the file system resides.
 127  */
 128
 129 struct xfs_buf;
 130
 131 /* call-back function on I/O completion */
 132 typedef void (*page_buf_iodone_t)(struct xfs_buf *);
 133 /* call-back function on I/O completion */
 134 typedef void (*page_buf_relse_t)(struct xfs_buf *);
 135 /* pre-write function */
 136 typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
 137
 138 #define PB_PAGES        2
 139
 140 typedef struct xfs_buf {
 141         struct semaphore        pb_sema;        /* semaphore for lockables  */
 142         unsigned long           pb_queuetime;   /* time buffer was queued   */
 143         atomic_t                pb_pin_count;   /* pin count                */
 144         wait_queue_head_t       pb_waiters;     /* unpin waiters            */
 145         struct list_head        pb_list;
 146         page_buf_flags_t        pb_flags;       /* status flags */
 147         struct list_head        pb_hash_list;   /* hash table list */
 148         xfs_bufhash_t           *pb_hash;       /* hash table list start */
 149         xfs_buftarg_t           *pb_target;     /* buffer target (device) */
 150         atomic_t                pb_hold;        /* reference count */
 151         xfs_daddr_t             pb_bn;          /* block number for I/O */
 152         loff_t                  pb_file_offset; /* offset in file */
 153         size_t                  pb_buffer_length; /* size of buffer in bytes */
 154         size_t                  pb_count_desired; /* desired transfer size */
 155         void                    *pb_addr;       /* virtual address of buffer */
 156         struct work_struct      pb_iodone_work;
 157         atomic_t                pb_io_remaining;/* #outstanding I/O requests */
 158         page_buf_iodone_t       pb_iodone;      /* I/O completion function */
 159         page_buf_relse_t        pb_relse;       /* releasing function */
 160         page_buf_bdstrat_t      pb_strat;       /* pre-write function */
 161         struct semaphore        pb_iodonesema;  /* Semaphore for I/O waiters */
 162         void                    *pb_fspriv;
 163         void                    *pb_fspriv2;
 164         void                    *pb_fspriv3;
 165         unsigned short          pb_error;       /* error code on I/O */
 166         unsigned short          pb_locked;      /* page array is locked */
 167         unsigned int            pb_page_count;  /* size of page array */
 168         unsigned int            pb_offset;      /* page offset in first page */
 169         struct page             **pb_pages;     /* array of page pointers */
 170         struct page             *pb_page_array[PB_PAGES]; /* inline pages */
 171 #ifdef PAGEBUF_LOCK_TRACKING
 172         int                     pb_last_holder;
 173 #endif
 174 } xfs_buf_t;
 175
 176
 177 /* Finding and Reading Buffers */
 178
 179 extern xfs_buf_t *_pagebuf_find(        /* find buffer for block if     */
 180                                         /* the block is in memory       */
 181                 xfs_buftarg_t *,        /* inode for block              */
 182                 loff_t,                 /* starting offset of range     */
 183                 size_t,                 /* length of range              */
 184                 page_buf_flags_t,       /* PBF_LOCK                     */
 185                 xfs_buf_t *);           /* newly allocated buffer       */
 186
 187 #define xfs_incore(buftarg,blkno,len,lockit) \
 188         _pagebuf_find(buftarg, blkno ,len, lockit, NULL)
 189
 190 extern xfs_buf_t *xfs_buf_get_flags(    /* allocate a buffer            */
 191                 xfs_buftarg_t *,        /* inode for buffer             */
 192                 loff_t,                 /* starting offset of range     */
 193                 size_t,                 /* length of range              */
 194                 page_buf_flags_t);      /* PBF_LOCK, PBF_READ,          */
 195                                         /* PBF_ASYNC                    */
 196
 197 #define xfs_buf_get(target, blkno, len, flags) \
 198         xfs_buf_get_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 199
 200 extern xfs_buf_t *xfs_buf_read_flags(   /* allocate and read a buffer   */
 201                 xfs_buftarg_t *,        /* inode for buffer             */
 202                 loff_t,                 /* starting offset of range     */
 203                 size_t,                 /* length of range              */
 204                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC          */
 205
 206 #define xfs_buf_read(target, blkno, len, flags) \
 207         xfs_buf_read_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 208
 209 extern xfs_buf_t *pagebuf_lookup(
 210                 xfs_buftarg_t *,
 211                 loff_t,                 /* starting offset of range     */
 212                 size_t,                 /* length of range              */
 213                 page_buf_flags_t);      /* PBF_READ, PBF_WRITE,         */
 214                                         /* PBF_FORCEIO,                 */
 215
 216 extern xfs_buf_t *pagebuf_get_empty(    /* allocate pagebuf struct with */
 217                                         /*  no memory or disk address   */
 218                 size_t len,
 219                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 220
 221 extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct       */
 222                                         /* without disk address         */
 223                 size_t len,
 224                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 225
 226 extern int pagebuf_associate_memory(
 227                 xfs_buf_t *,
 228                 void *,
 229                 size_t);
 230
 231 extern void pagebuf_hold(               /* increment reference count    */
 232                 xfs_buf_t *);           /* buffer to hold               */
 233
 234 extern void pagebuf_readahead(          /* read ahead into cache        */
 235                 xfs_buftarg_t  *,       /* target for buffer (or NULL)  */
 236                 loff_t,                 /* starting offset of range     */
 237                 size_t,                 /* length of range              */
 238                 page_buf_flags_t);      /* additional read flags        */
 239
 240 /* Releasing Buffers */
 241
 242 extern void pagebuf_free(               /* deallocate a buffer          */
 243                 xfs_buf_t *);           /* buffer to deallocate         */
 244
 245 extern void pagebuf_rele(               /* release hold on a buffer     */
 246                 xfs_buf_t *);           /* buffer to release            */
 247
 248 /* Locking and Unlocking Buffers */
 249
 250 extern int pagebuf_cond_lock(           /* lock buffer, if not locked   */
 251                                         /* (returns -EBUSY if locked)   */
 252                 xfs_buf_t *);           /* buffer to lock               */
 253
 254 extern int pagebuf_lock_value(          /* return count on lock         */
 255                 xfs_buf_t *);          /* buffer to check              */
 256
 257 extern int pagebuf_lock(                /* lock buffer                  */
 258                 xfs_buf_t *);          /* buffer to lock               */
 259
 260 extern void pagebuf_unlock(             /* unlock buffer                */
 261                 xfs_buf_t *);           /* buffer to unlock             */
 262
 263 /* Buffer Read and Write Routines */
 264
 265 extern void pagebuf_iodone(             /* mark buffer I/O complete     */
 266                 xfs_buf_t *,            /* buffer to mark               */
 267                 int,                    /* use data/log helper thread.  */
 268                 int);                   /* run completion locally, or in
 269                                          * a helper thread.             */
 270
 271 extern void pagebuf_ioerror(            /* mark buffer in error (or not) */
 272                 xfs_buf_t *,            /* buffer to mark               */
 273                 int);                   /* error to store (0 if none)   */
 274
 275 extern int pagebuf_iostart(             /* start I/O on a buffer        */
 276                 xfs_buf_t *,            /* buffer to start              */
 277                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC,         */
 278                                         /* PBF_READ, PBF_WRITE,         */
 279                                         /* PBF_DELWRI                   */
 280
 281 extern int pagebuf_iorequest(           /* start real I/O               */
 282                 xfs_buf_t *);           /* buffer to convey to device   */
 283
 284 extern int pagebuf_iowait(              /* wait for buffer I/O done     */
 285                 xfs_buf_t *);           /* buffer to wait on            */
 286
 287 extern void pagebuf_iomove(             /* move data in/out of pagebuf  */
 288                 xfs_buf_t *,            /* buffer to manipulate         */
 289                 size_t,                 /* starting buffer offset       */
 290                 size_t,                 /* length in buffer             */
 291                 caddr_t,                /* data pointer                 */
 292                 page_buf_rw_t);         /* direction                    */
 293
 294 static inline int pagebuf_iostrategy(xfs_buf_t *pb)
 295 {
 296         return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
 297 }
 298
 299 static inline int pagebuf_geterror(xfs_buf_t *pb)
 300 {
 301         return pb ? pb->pb_error : ENOMEM;
 302 }
 303
 304 /* Buffer Utility Routines */
 305
 306 extern caddr_t pagebuf_offset(          /* pointer at offset in buffer  */
 307                 xfs_buf_t *,            /* buffer to offset into        */
 308                 size_t);                /* offset                       */
 309
 310 /* Pinning Buffer Storage in Memory */
 311
 312 extern void pagebuf_pin(                /* pin buffer in memory         */
 313                 xfs_buf_t *);           /* buffer to pin                */
 314
 315 extern void pagebuf_unpin(              /* unpin buffered data          */
 316                 xfs_buf_t *);           /* buffer to unpin              */
 317
 318 extern int pagebuf_ispin(               /* check if buffer is pinned    */
 319                 xfs_buf_t *);           /* buffer to check              */
 320
 321 /* Delayed Write Buffer Routines */
 322
 323 extern void pagebuf_delwri_dequeue(xfs_buf_t *);
 324
 325 /* Buffer Daemon Setup Routines */
 326
 327 extern int pagebuf_init(void);
 328 extern void pagebuf_terminate(void);
 329
 330
 331 #ifdef PAGEBUF_TRACE
 332 extern ktrace_t *pagebuf_trace_buf;
 333 extern void pagebuf_trace(
 334                 xfs_buf_t *,            /* buffer being traced          */
 335                 char *,                 /* description of operation     */
 336                 void *,                 /* arbitrary diagnostic value   */
 337                 void *);                /* return address               */
 338 #else
 339 # define pagebuf_trace(pb, id, ptr, ra) do { } while (0)
 340 #endif
 341
 342 #define pagebuf_target_name(target)     \
 343         ({ char __b[BDEVNAME_SIZE]; bdevname((target)->pbr_bdev, __b); __b; })
 344
 345
 346
 347
 348
 349 /* These are just for xfs_syncsub... it sets an internal variable
 350  * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
 351  */
 352 #define XFS_B_ASYNC             PBF_ASYNC
 353 #define XFS_B_DELWRI            PBF_DELWRI
 354 #define XFS_B_READ              PBF_READ
 355 #define XFS_B_WRITE             PBF_WRITE
 356 #define XFS_B_STALE             PBF_STALE
 357
 358 #define XFS_BUF_TRYLOCK         PBF_TRYLOCK
 359 #define XFS_INCORE_TRYLOCK      PBF_TRYLOCK
 360 #define XFS_BUF_LOCK            PBF_LOCK
 361 #define XFS_BUF_MAPPED          PBF_MAPPED
 362
 363 #define BUF_BUSY                PBF_DONT_BLOCK
 364
 365 #define XFS_BUF_BFLAGS(x)       ((x)->pb_flags)
 366 #define XFS_BUF_ZEROFLAGS(x)    \
 367         ((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
 368
 369 #define XFS_BUF_STALE(x)        ((x)->pb_flags |= XFS_B_STALE)
 370 #define XFS_BUF_UNSTALE(x)      ((x)->pb_flags &= ~XFS_B_STALE)
 371 #define XFS_BUF_ISSTALE(x)      ((x)->pb_flags & XFS_B_STALE)
 372 #define XFS_BUF_SUPER_STALE(x)  do {                            \
 373                                         XFS_BUF_STALE(x);       \
 374                                         pagebuf_delwri_dequeue(x);      \
 375                                         XFS_BUF_DONE(x);        \
 376                                 } while (0)
 377
 378 #define XFS_BUF_MANAGE          PBF_FS_MANAGED
 379 #define XFS_BUF_UNMANAGE(x)     ((x)->pb_flags &= ~PBF_FS_MANAGED)
 380
 381 #define XFS_BUF_DELAYWRITE(x)    ((x)->pb_flags |= PBF_DELWRI)
 382 #define XFS_BUF_UNDELAYWRITE(x)  pagebuf_delwri_dequeue(x)
 383 #define XFS_BUF_ISDELAYWRITE(x)  ((x)->pb_flags & PBF_DELWRI)
 384
 385 #define XFS_BUF_ERROR(x,no)      pagebuf_ioerror(x,no)
 386 #define XFS_BUF_GETERROR(x)      pagebuf_geterror(x)
 387 #define XFS_BUF_ISERROR(x)       (pagebuf_geterror(x)?1:0)
 388
 389 #define XFS_BUF_DONE(x)          ((x)->pb_flags &= ~(PBF_PARTIAL|PBF_NONE))
 390 #define XFS_BUF_UNDONE(x)        ((x)->pb_flags |= PBF_PARTIAL|PBF_NONE)
 391 #define XFS_BUF_ISDONE(x)        (!(PBF_NOT_DONE(x)))
 392
 393 #define XFS_BUF_BUSY(x)          ((x)->pb_flags |= PBF_FORCEIO)
 394 #define XFS_BUF_UNBUSY(x)        ((x)->pb_flags &= ~PBF_FORCEIO)
 395 #define XFS_BUF_ISBUSY(x)        (1)
 396
 397 #define XFS_BUF_ASYNC(x)         ((x)->pb_flags |= PBF_ASYNC)
 398 #define XFS_BUF_UNASYNC(x)       ((x)->pb_flags &= ~PBF_ASYNC)
 399 #define XFS_BUF_ISASYNC(x)       ((x)->pb_flags & PBF_ASYNC)
 400
 401 #define XFS_BUF_FLUSH(x)         ((x)->pb_flags |= PBF_FLUSH)
 402 #define XFS_BUF_UNFLUSH(x)       ((x)->pb_flags &= ~PBF_FLUSH)
 403 #define XFS_BUF_ISFLUSH(x)       ((x)->pb_flags & PBF_FLUSH)
 404
 405 #define XFS_BUF_SHUT(x)          printk("XFS_BUF_SHUT not implemented yet\n")
 406 #define XFS_BUF_UNSHUT(x)        printk("XFS_BUF_UNSHUT not implemented yet\n")
 407 #define XFS_BUF_ISSHUT(x)        (0)
 408
 409 #define XFS_BUF_HOLD(x)         pagebuf_hold(x)
 410 #define XFS_BUF_READ(x)         ((x)->pb_flags |= PBF_READ)
 411 #define XFS_BUF_UNREAD(x)       ((x)->pb_flags &= ~PBF_READ)
 412 #define XFS_BUF_ISREAD(x)       ((x)->pb_flags & PBF_READ)
 413
 414 #define XFS_BUF_WRITE(x)        ((x)->pb_flags |= PBF_WRITE)
 415 #define XFS_BUF_UNWRITE(x)      ((x)->pb_flags &= ~PBF_WRITE)
 416 #define XFS_BUF_ISWRITE(x)      ((x)->pb_flags & PBF_WRITE)
 417
 418 #define XFS_BUF_ISUNINITIAL(x)   (0)
 419 #define XFS_BUF_UNUNINITIAL(x)   (0)
 420
 421 #define XFS_BUF_BP_ISMAPPED(bp)  1
 422
 423 #define XFS_BUF_DATAIO(x)       ((x)->pb_flags |= PBF_FS_DATAIOD)
 424 #define XFS_BUF_UNDATAIO(x)     ((x)->pb_flags &= ~PBF_FS_DATAIOD)
 425
 426 #define XFS_BUF_IODONE_FUNC(buf)        (buf)->pb_iodone
 427 #define XFS_BUF_SET_IODONE_FUNC(buf, func)      \
 428                         (buf)->pb_iodone = (func)
 429 #define XFS_BUF_CLR_IODONE_FUNC(buf)            \
 430                         (buf)->pb_iodone = NULL
 431 #define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)     \
 432                         (buf)->pb_strat = (func)
 433 #define XFS_BUF_CLR_BDSTRAT_FUNC(buf)           \
 434                         (buf)->pb_strat = NULL
 435
 436 #define XFS_BUF_FSPRIVATE(buf, type)            \
 437                         ((type)(buf)->pb_fspriv)
 438 #define XFS_BUF_SET_FSPRIVATE(buf, value)       \
 439                         (buf)->pb_fspriv = (void *)(value)
 440 #define XFS_BUF_FSPRIVATE2(buf, type)           \
 441                         ((type)(buf)->pb_fspriv2)
 442 #define XFS_BUF_SET_FSPRIVATE2(buf, value)      \
 443                         (buf)->pb_fspriv2 = (void *)(value)
 444 #define XFS_BUF_FSPRIVATE3(buf, type)           \
 445                         ((type)(buf)->pb_fspriv3)
 446 #define XFS_BUF_SET_FSPRIVATE3(buf, value)      \
 447                         (buf)->pb_fspriv3  = (void *)(value)
 448 #define XFS_BUF_SET_START(buf)
 449
 450 #define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
 451                         (buf)->pb_relse = (value)
 452
 453 #define XFS_BUF_PTR(bp)         (xfs_caddr_t)((bp)->pb_addr)
 454
 455 extern inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
 456 {
 457         if (bp->pb_flags & PBF_MAPPED)
 458                 return XFS_BUF_PTR(bp) + offset;
 459         return (xfs_caddr_t) pagebuf_offset(bp, offset);
 460 }
 461
 462 #define XFS_BUF_SET_PTR(bp, val, count)         \
 463                                 pagebuf_associate_memory(bp, val, count)
 464 #define XFS_BUF_ADDR(bp)        ((bp)->pb_bn)
 465 #define XFS_BUF_SET_ADDR(bp, blk)               \
 466                         ((bp)->pb_bn = (xfs_daddr_t)(blk))
 467 #define XFS_BUF_OFFSET(bp)      ((bp)->pb_file_offset)
 468 #define XFS_BUF_SET_OFFSET(bp, off)             \
 469                         ((bp)->pb_file_offset = (off))
 470 #define XFS_BUF_COUNT(bp)       ((bp)->pb_count_desired)
 471 #define XFS_BUF_SET_COUNT(bp, cnt)              \
 472                         ((bp)->pb_count_desired = (cnt))
 473 #define XFS_BUF_SIZE(bp)        ((bp)->pb_buffer_length)
 474 #define XFS_BUF_SET_SIZE(bp, cnt)               \
 475                         ((bp)->pb_buffer_length = (cnt))
 476 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 477 #define XFS_BUF_SET_VTYPE(bp, type)
 478 #define XFS_BUF_SET_REF(bp, ref)
 479
 480 #define XFS_BUF_ISPINNED(bp)    pagebuf_ispin(bp)
 481
 482 #define XFS_BUF_VALUSEMA(bp)    pagebuf_lock_value(bp)
 483 #define XFS_BUF_CPSEMA(bp)      (pagebuf_cond_lock(bp) == 0)
 484 #define XFS_BUF_VSEMA(bp)       pagebuf_unlock(bp)
 485 #define XFS_BUF_PSEMA(bp,x)     pagebuf_lock(bp)
 486 #define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
 487
 488 /* setup the buffer target from a buftarg structure */
 489 #define XFS_BUF_SET_TARGET(bp, target)  \
 490                 (bp)->pb_target = (target)
 491 #define XFS_BUF_TARGET(bp)      ((bp)->pb_target)
 492 #define XFS_BUFTARG_NAME(target)        \
 493                 pagebuf_target_name(target)
 494
 495 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 496 #define XFS_BUF_SET_VTYPE(bp, type)
 497 #define XFS_BUF_SET_REF(bp, ref)
 498
 499 static inline int       xfs_bawrite(void *mp, xfs_buf_t *bp)
 500 {
 501         bp->pb_fspriv3 = mp;
 502         bp->pb_strat = xfs_bdstrat_cb;
 503         pagebuf_delwri_dequeue(bp);
 504         return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
 505 }
 506
 507 static inline void      xfs_buf_relse(xfs_buf_t *bp)
 508 {
 509         if (!bp->pb_relse)
 510                 pagebuf_unlock(bp);
 511         pagebuf_rele(bp);
 512 }
 513
 514 #define xfs_bpin(bp)            pagebuf_pin(bp)
 515 #define xfs_bunpin(bp)          pagebuf_unpin(bp)
 516
 517 #define xfs_buftrace(id, bp)    \
 518             pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
 519
 520 #define xfs_biodone(pb)             \
 521             pagebuf_iodone(pb, (pb->pb_flags & PBF_FS_DATAIOD), 0)
 522
 523 #define xfs_biomove(pb, off, len, data, rw) \
 524             pagebuf_iomove((pb), (off), (len), (data), \
 525                 ((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
 526
 527 #define xfs_biozero(pb, off, len) \
 528             pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
 529
 530
 531 static inline int       XFS_bwrite(xfs_buf_t *pb)
 532 {
 533         int     iowait = (pb->pb_flags & PBF_ASYNC) == 0;
 534         int     error = 0;
 535
 536         if (!iowait)
 537                 pb->pb_flags |= _PBF_RUN_QUEUES;
 538
 539         pagebuf_delwri_dequeue(pb);
 540         pagebuf_iostrategy(pb);
 541         if (iowait) {
 542                 error = pagebuf_iowait(pb);
 543                 xfs_buf_relse(pb);
 544         }
 545         return error;
 546 }
 547
 548 #define XFS_bdwrite(pb)              \
 549             pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
 550
 551 static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
 552 {
 553         bp->pb_strat = xfs_bdstrat_cb;
 554         bp->pb_fspriv3 = mp;
 555
 556         return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
 557 }
 558
 559 #define XFS_bdstrat(bp) pagebuf_iorequest(bp)
 560
 561 #define xfs_iowait(pb)  pagebuf_iowait(pb)
 562
 563 #define xfs_baread(target, rablkno, ralen)  \
 564         pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
 565
 566 #define xfs_buf_get_empty(len, target)  pagebuf_get_empty((len), (target))
 567 #define xfs_buf_get_noaddr(len, target) pagebuf_get_no_daddr((len), (target))
 568 #define xfs_buf_free(bp)                pagebuf_free(bp)
 569
 570
 571 /*
 572  *      Handling of buftargs.
 573  */
 574
 575 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
 576 extern void xfs_free_buftarg(xfs_buftarg_t *, int);
 577 extern void xfs_wait_buftarg(xfs_buftarg_t *);
 578 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
 579 extern void xfs_incore_relse(xfs_buftarg_t *, int, int);
 580 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
 581
 582 #define xfs_getsize_buftarg(buftarg) \
 583         block_size((buftarg)->pbr_bdev)
 584 #define xfs_readonly_buftarg(buftarg) \
 585         bdev_read_only((buftarg)->pbr_bdev)
 586 #define xfs_binval(buftarg) \
 587         xfs_flush_buftarg(buftarg, 1)
 588 #define XFS_bflush(buftarg) \
 589         xfs_flush_buftarg(buftarg, 1)
 590
 591 #endif  /* __XFS_BUF_H__ */