release/src/linux/linux/fs/xfs/linux-2.4/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/version.h>
  41 #include <linux/config.h>
  42 #include <linux/list.h>
  43 #include <linux/types.h>
  44 #include <linux/spinlock.h>
  45 #include <asm/system.h>
  46 #include <linux/mm.h>
  47 #include <linux/fs.h>
  48 #include <linux/uio.h>
  49
  50 /* nptl patch changes where the sigmask_lock is defined */
  51 #ifdef CLONE_SIGNAL /* stock */
  52 #define sigmask_lock()          spin_lock_irq(&current->sigmask_lock);
  53 #define sigmask_unlock()        spin_unlock_irq(&current->sigmask_lock);
  54 #define __recalc_sigpending(x)  recalc_sigpending(x)
  55 #else /* nptl */
  56 #define sigmask_lock()          spin_lock_irq(&current->sighand->siglock);
  57 #define sigmask_unlock()        spin_unlock_irq(&current->sighand->siglock);
  58 #define __recalc_sigpending(x)  recalc_sigpending()
  59 #endif
  60 /*
  61  *      Base types
  62  */
  63
  64 #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
  65
  66 #define page_buf_ctob(pp)       ((pp) * PAGE_CACHE_SIZE)
  67 #define page_buf_btoc(dd)       (((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
  68 #define page_buf_btoct(dd)      ((dd) >> PAGE_CACHE_SHIFT)
  69 #define page_buf_poff(aa)       ((aa) & ~PAGE_CACHE_MASK)
  70
  71 typedef enum page_buf_rw_e {
  72         PBRW_READ = 1,                  /* transfer into target memory */
  73         PBRW_WRITE = 2,                 /* transfer from target memory */
  74         PBRW_ZERO = 3                   /* Zero target memory */
  75 } page_buf_rw_t;
  76
  77
  78 typedef enum page_buf_flags_e {         /* pb_flags values */
  79         PBF_READ = (1 << 0),    /* buffer intended for reading from device */
  80         PBF_WRITE = (1 << 1),   /* buffer intended for writing to device   */
  81         PBF_MAPPED = (1 << 2),  /* buffer mapped (pb_addr valid)           */
  82         PBF_PARTIAL = (1 << 3), /* buffer partially read                   */
  83         PBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
  84         PBF_NONE = (1 << 5),    /* buffer not read at all                  */
  85         PBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
  86         PBF_STALE = (1 << 7),   /* buffer has been staled, do not find it  */
  87         PBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
  88         PBF_FS_DATAIOD = (1 << 9),  /* schedule IO completion on fs datad  */
  89         PBF_FORCEIO = (1 << 10),    /* ignore any cache state              */
  90         PBF_FLUSH = (1 << 11),      /* flush disk write cache              */
  91         PBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead             */
  92         PBF_DIRECTIO = (1 << 13),   /* used for a direct IO mapping        */
  93
  94         /* flags used only as arguments to access routines */
  95         PBF_LOCK = (1 << 14),       /* lock requested                      */
  96         PBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait     */
  97         PBF_DONT_BLOCK = (1 << 16), /* do not block in current thread      */
  98
  99         /* flags used only internally */
 100         _PBF_PAGE_CACHE = (1 << 17),/* backed by pagecache                 */
 101         _PBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()              */
 102         _PBF_RUN_QUEUES = (1 << 19),/* run block device task queue         */
 103         _PBF_PRIVATE_BH = (1 << 20),/* do not use public buffer heads      */
 104 } page_buf_flags_t;
 105
 106 #define PBF_UPDATE (PBF_READ | PBF_WRITE)
 107 #define PBF_NOT_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) != 0)
 108 #define PBF_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) == 0)
 109
 110 #define PBR_SECTOR_ONLY 1       /* only use sector size buffer heads */
 111 #define PBR_ALIGNED_ONLY 2      /* only use aligned I/O */
 112
 113 typedef struct xfs_buftarg {
 114         int                     pbr_flags;
 115         dev_t                   pbr_dev;
 116         kdev_t                  pbr_kdev;
 117         struct block_device     *pbr_bdev;
 118         struct address_space    *pbr_mapping;
 119         unsigned int            pbr_bsize;
 120         unsigned int            pbr_sshift;
 121         size_t                  pbr_smask;
 122 } xfs_buftarg_t;
 123
 124 /*
 125  *      xfs_buf_t:  Buffer structure for page cache-based buffers
 126  *
 127  * This buffer structure is used by the page cache buffer management routines
 128  * to refer to an assembly of pages forming a logical buffer.  The actual I/O
 129  * is performed with buffer_head structures, as required by drivers.
 130  *
 131  * The buffer structure is used on temporary basis only, and discarded when
 132  * released.  The real data storage is recorded in the page cache.  Metadata is
 133  * hashed to the block device on which the file system resides.
 134  */
 135
 136 struct xfs_buf;
 137
 138 /* call-back function on I/O completion */
 139 typedef void (*page_buf_iodone_t)(struct xfs_buf *);
 140 /* call-back function on I/O completion */
 141 typedef void (*page_buf_relse_t)(struct xfs_buf *);
 142 /* pre-write function */
 143 typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
 144
 145 #define PB_PAGES        4
 146
 147 typedef struct xfs_buf {
 148         struct semaphore        pb_sema;        /* semaphore for lockables  */
 149         unsigned long           pb_queuetime;   /* time buffer was queued   */
 150         atomic_t                pb_pin_count;   /* pin count                */
 151         wait_queue_head_t       pb_waiters;     /* unpin waiters            */
 152         struct list_head        pb_list;
 153         page_buf_flags_t        pb_flags;       /* status flags */
 154         struct list_head        pb_hash_list;
 155         xfs_buftarg_t           *pb_target;     /* logical object */
 156         atomic_t                pb_hold;        /* reference count */
 157         xfs_daddr_t             pb_bn;          /* block number for I/O */
 158         loff_t                  pb_file_offset; /* offset in file */
 159         size_t                  pb_buffer_length; /* size of buffer in bytes */
 160         size_t                  pb_count_desired; /* desired transfer size */
 161         void                    *pb_addr;       /* virtual address of buffer */
 162         struct tq_struct        pb_iodone_sched;
 163         atomic_t                pb_io_remaining;/* #outstanding I/O requests */
 164         page_buf_iodone_t       pb_iodone;      /* I/O completion function */
 165         page_buf_relse_t        pb_relse;       /* releasing function */
 166         page_buf_bdstrat_t      pb_strat;       /* pre-write function */
 167         struct semaphore        pb_iodonesema;  /* Semaphore for I/O waiters */
 168         void                    *pb_fspriv;
 169         void                    *pb_fspriv2;
 170         void                    *pb_fspriv3;
 171         unsigned short          pb_error;       /* error code on I/O */
 172         unsigned short          pb_page_count;  /* size of page array */
 173         unsigned short          pb_offset;      /* page offset in first page */
 174         unsigned char           pb_locked;      /* page array is locked */
 175         unsigned char           pb_hash_index;  /* hash table index     */
 176         struct page             **pb_pages;     /* array of page pointers */
 177         struct page             *pb_page_array[PB_PAGES]; /* inline pages */
 178 #ifdef PAGEBUF_LOCK_TRACKING
 179         int                     pb_last_holder;
 180 #endif
 181 } xfs_buf_t;
 182
 183
 184 /* Finding and Reading Buffers */
 185
 186 extern xfs_buf_t *_pagebuf_find(        /* find buffer for block if     */
 187                                         /* the block is in memory       */
 188                 xfs_buftarg_t *,        /* inode for block              */
 189                 loff_t,                 /* starting offset of range     */
 190                 size_t,                 /* length of range              */
 191                 page_buf_flags_t,       /* PBF_LOCK                     */
 192                 xfs_buf_t *);           /* newly allocated buffer       */
 193
 194 #define xfs_incore(buftarg,blkno,len,lockit) \
 195         _pagebuf_find(buftarg, blkno ,len, lockit, NULL)
 196
 197 extern xfs_buf_t *xfs_buf_get_flags(    /* allocate a buffer            */
 198                 xfs_buftarg_t *,        /* inode for buffer             */
 199                 loff_t,                 /* starting offset of range     */
 200                 size_t,                 /* length of range              */
 201                 page_buf_flags_t);      /* PBF_LOCK, PBF_READ,          */
 202                                         /* PBF_ASYNC                    */
 203
 204 #define xfs_buf_get(target, blkno, len, flags) \
 205         xfs_buf_get_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 206
 207 extern xfs_buf_t *xfs_buf_read_flags(   /* allocate and read a buffer   */
 208                 xfs_buftarg_t *,        /* inode for buffer             */
 209                 loff_t,                 /* starting offset of range     */
 210                 size_t,                 /* length of range              */
 211                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC          */
 212
 213 #define xfs_buf_read(target, blkno, len, flags) \
 214         xfs_buf_read_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 215
 216 extern xfs_buf_t *pagebuf_lookup(
 217                 xfs_buftarg_t *,
 218                 loff_t,                 /* starting offset of range     */
 219                 size_t,                 /* length of range              */
 220                 page_buf_flags_t);      /* PBF_READ, PBF_WRITE,         */
 221                                         /* PBF_FORCEIO,                 */
 222
 223 extern xfs_buf_t *pagebuf_get_empty(    /* allocate pagebuf struct with */
 224                                         /*  no memory or disk address   */
 225                 size_t len,
 226                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 227
 228 extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct       */
 229                                         /* without disk address         */
 230                 size_t len,
 231                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 232
 233 extern int pagebuf_associate_memory(
 234                 xfs_buf_t *,
 235                 void *,
 236                 size_t);
 237
 238 extern void pagebuf_hold(               /* increment reference count    */
 239                 xfs_buf_t *);           /* buffer to hold               */
 240
 241 extern void pagebuf_readahead(          /* read ahead into cache        */
 242                 xfs_buftarg_t  *,       /* target for buffer (or NULL)  */
 243                 loff_t,                 /* starting offset of range     */
 244                 size_t,                 /* length of range              */
 245                 page_buf_flags_t);      /* additional read flags        */
 246
 247 /* Releasing Buffers */
 248
 249 extern void pagebuf_free(               /* deallocate a buffer          */
 250                 xfs_buf_t *);           /* buffer to deallocate         */
 251
 252 extern void pagebuf_rele(               /* release hold on a buffer     */
 253                 xfs_buf_t *);           /* buffer to release            */
 254
 255 /* Locking and Unlocking Buffers */
 256
 257 extern int pagebuf_cond_lock(           /* lock buffer, if not locked   */
 258                                         /* (returns -EBUSY if locked)   */
 259                 xfs_buf_t *);           /* buffer to lock               */
 260
 261 extern int pagebuf_lock_value(          /* return count on lock         */
 262                 xfs_buf_t *);          /* buffer to check              */
 263
 264 extern int pagebuf_lock(                /* lock buffer                  */
 265                 xfs_buf_t *);          /* buffer to lock               */
 266
 267 extern void pagebuf_unlock(             /* unlock buffer                */
 268                 xfs_buf_t *);           /* buffer to unlock             */
 269
 270 /* Buffer Read and Write Routines */
 271
 272 extern void pagebuf_iodone(             /* mark buffer I/O complete     */
 273                 xfs_buf_t *,            /* buffer to mark               */
 274                 int,                    /* use data/log helper thread.  */
 275                 int);                   /* run completion locally, or in
 276                                          * a helper thread.             */
 277
 278 extern void pagebuf_ioerror(            /* mark buffer in error (or not) */
 279                 xfs_buf_t *,            /* buffer to mark               */
 280                 int);                   /* error to store (0 if none)   */
 281
 282 extern int pagebuf_iostart(             /* start I/O on a buffer        */
 283                 xfs_buf_t *,            /* buffer to start              */
 284                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC,         */
 285                                         /* PBF_READ, PBF_WRITE,         */
 286                                         /* PBF_DELWRI                   */
 287
 288 extern int pagebuf_iorequest(           /* start real I/O               */
 289                 xfs_buf_t *);           /* buffer to convey to device   */
 290
 291 extern int pagebuf_iowait(              /* wait for buffer I/O done     */
 292                 xfs_buf_t *);           /* buffer to wait on            */
 293
 294 extern void pagebuf_iomove(             /* move data in/out of pagebuf  */
 295                 xfs_buf_t *,            /* buffer to manipulate         */
 296                 size_t,                 /* starting buffer offset       */
 297                 size_t,                 /* length in buffer             */
 298                 caddr_t,                /* data pointer                 */
 299                 page_buf_rw_t);         /* direction                    */
 300
 301 static inline int pagebuf_iostrategy(xfs_buf_t *pb)
 302 {
 303         return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
 304 }
 305
 306 static inline int pagebuf_geterror(xfs_buf_t *pb)
 307 {
 308         return pb ? pb->pb_error : ENOMEM;
 309 }
 310
 311 /* Buffer Utility Routines */
 312
 313 extern caddr_t pagebuf_offset(          /* pointer at offset in buffer  */
 314                 xfs_buf_t *,            /* buffer to offset into        */
 315                 size_t);                /* offset                       */
 316
 317 /* Pinning Buffer Storage in Memory */
 318
 319 extern void pagebuf_pin(                /* pin buffer in memory         */
 320                 xfs_buf_t *);           /* buffer to pin                */
 321
 322 extern void pagebuf_unpin(              /* unpin buffered data          */
 323                 xfs_buf_t *);           /* buffer to unpin              */
 324
 325 extern int pagebuf_ispin(               /* check if buffer is pinned    */
 326                 xfs_buf_t *);           /* buffer to check              */
 327
 328 /* Delayed Write Buffer Routines */
 329
 330 extern void pagebuf_delwri_dequeue(xfs_buf_t *);
 331
 332 /* Buffer Daemon Setup Routines */
 333
 334 extern int pagebuf_init(void);
 335 extern void pagebuf_terminate(void);
 336
 337
 338 #ifdef PAGEBUF_TRACE
 339 extern ktrace_t *pagebuf_trace_buf;
 340 extern void pagebuf_trace(
 341                 xfs_buf_t *,            /* buffer being traced          */
 342                 char *,                 /* description of operation     */
 343                 void *,                 /* arbitrary diagnostic value   */
 344                 void *);                /* return address               */
 345 #else
 346 # define pagebuf_trace(pb, id, ptr, ra) do { } while (0)
 347 #endif
 348
 349 #define pagebuf_target_name(target)     bdevname((target)->pbr_kdev)
 350
 351 /*
 352  * Kernel version compatibility macros
 353  */
 354
 355 #define page_buffers(page)      ((page)->buffers)
 356 #define page_has_buffers(page)  ((page)->buffers)
 357 #define PageUptodate(x)         Page_Uptodate(x)
 358 /*
 359  * macro tricks to expand the set_buffer_foo() and clear_buffer_foo()
 360  * functions.
 361  */
 362 #define BUFFER_FNS(bit, name)                                           \
 363 static inline void set_buffer_##name(struct buffer_head *bh)            \
 364 {                                                                       \
 365         set_bit(BH_##bit, &(bh)->b_state);                              \
 366 }                                                                       \
 367 static inline void clear_buffer_##name(struct buffer_head *bh)          \
 368 {                                                                       \
 369         clear_bit(BH_##bit, &(bh)->b_state);                            \
 370 }                                                                       \
 371
 372 /*
 373  * Emit the buffer bitops functions.   Note that there are also functions
 374  * of the form "mark_buffer_foo()".  These are higher-level functions which
 375  * do something in addition to setting a b_state bit.
 376  */
 377 BUFFER_FNS(Uptodate, uptodate)
 378 BUFFER_FNS(Dirty, dirty)
 379 BUFFER_FNS(Lock, locked)
 380 BUFFER_FNS(Req, req)
 381 BUFFER_FNS(Mapped, mapped)
 382 BUFFER_FNS(New, new)
 383 BUFFER_FNS(Async, async)
 384 BUFFER_FNS(Wait_IO, wait_io)
 385 BUFFER_FNS(Launder, launder)
 386 BUFFER_FNS(Sync, sync)
 387 BUFFER_FNS(Delay, delay)
 388
 389 #define get_seconds()           CURRENT_TIME
 390 #define i_size_read(inode)      ((inode)->i_size)
 391 #define i_size_write(inode, sz) ((inode)->i_size = (sz))
 392
 393 /* These are just for xfs_syncsub... it sets an internal variable
 394  * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
 395  */
 396 #define XFS_B_ASYNC             PBF_ASYNC
 397 #define XFS_B_DELWRI            PBF_DELWRI
 398 #define XFS_B_READ              PBF_READ
 399 #define XFS_B_WRITE             PBF_WRITE
 400 #define XFS_B_STALE             PBF_STALE
 401
 402 #define XFS_BUF_TRYLOCK         PBF_TRYLOCK
 403 #define XFS_INCORE_TRYLOCK      PBF_TRYLOCK
 404 #define XFS_BUF_LOCK            PBF_LOCK
 405 #define XFS_BUF_MAPPED          PBF_MAPPED
 406
 407 #define BUF_BUSY                PBF_DONT_BLOCK
 408
 409 #define XFS_BUF_BFLAGS(x)       ((x)->pb_flags)
 410 #define XFS_BUF_ZEROFLAGS(x)    \
 411         ((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
 412
 413 #define XFS_BUF_STALE(x)        ((x)->pb_flags |= XFS_B_STALE)
 414 #define XFS_BUF_UNSTALE(x)      ((x)->pb_flags &= ~XFS_B_STALE)
 415 #define XFS_BUF_ISSTALE(x)      ((x)->pb_flags & XFS_B_STALE)
 416 #define XFS_BUF_SUPER_STALE(x)  do {                            \
 417                                         XFS_BUF_STALE(x);       \
 418                                         pagebuf_delwri_dequeue(x);      \
 419                                         XFS_BUF_DONE(x);        \
 420                                 } while (0)
 421
 422 #define XFS_BUF_MANAGE          PBF_FS_MANAGED
 423 #define XFS_BUF_UNMANAGE(x)     ((x)->pb_flags &= ~PBF_FS_MANAGED)
 424
 425 #define XFS_BUF_DELAYWRITE(x)    ((x)->pb_flags |= PBF_DELWRI)
 426 #define XFS_BUF_UNDELAYWRITE(x)  pagebuf_delwri_dequeue(x)
 427 #define XFS_BUF_ISDELAYWRITE(x)  ((x)->pb_flags & PBF_DELWRI)
 428
 429 #define XFS_BUF_ERROR(x,no)      pagebuf_ioerror(x,no)
 430 #define XFS_BUF_GETERROR(x)      pagebuf_geterror(x)
 431 #define XFS_BUF_ISERROR(x)       (pagebuf_geterror(x)?1:0)
 432
 433 #define XFS_BUF_DONE(x)          ((x)->pb_flags &= ~(PBF_PARTIAL|PBF_NONE))
 434 #define XFS_BUF_UNDONE(x)        ((x)->pb_flags |= PBF_PARTIAL|PBF_NONE)
 435 #define XFS_BUF_ISDONE(x)        (!(PBF_NOT_DONE(x)))
 436
 437 #define XFS_BUF_BUSY(x)          ((x)->pb_flags |= PBF_FORCEIO)
 438 #define XFS_BUF_UNBUSY(x)        ((x)->pb_flags &= ~PBF_FORCEIO)
 439 #define XFS_BUF_ISBUSY(x)        (1)
 440
 441 #define XFS_BUF_ASYNC(x)         ((x)->pb_flags |= PBF_ASYNC)
 442 #define XFS_BUF_UNASYNC(x)       ((x)->pb_flags &= ~PBF_ASYNC)
 443 #define XFS_BUF_ISASYNC(x)       ((x)->pb_flags & PBF_ASYNC)
 444
 445 #define XFS_BUF_FLUSH(x)         ((x)->pb_flags |= PBF_FLUSH)
 446 #define XFS_BUF_UNFLUSH(x)       ((x)->pb_flags &= ~PBF_FLUSH)
 447 #define XFS_BUF_ISFLUSH(x)       ((x)->pb_flags & PBF_FLUSH)
 448
 449 #define XFS_BUF_SHUT(x)          printk("XFS_BUF_SHUT not implemented yet\n")
 450 #define XFS_BUF_UNSHUT(x)        printk("XFS_BUF_UNSHUT not implemented yet\n")
 451 #define XFS_BUF_ISSHUT(x)        (0)
 452
 453 #define XFS_BUF_HOLD(x)         pagebuf_hold(x)
 454 #define XFS_BUF_READ(x)         ((x)->pb_flags |= PBF_READ)
 455 #define XFS_BUF_UNREAD(x)       ((x)->pb_flags &= ~PBF_READ)
 456 #define XFS_BUF_ISREAD(x)       ((x)->pb_flags & PBF_READ)
 457
 458 #define XFS_BUF_WRITE(x)        ((x)->pb_flags |= PBF_WRITE)
 459 #define XFS_BUF_UNWRITE(x)      ((x)->pb_flags &= ~PBF_WRITE)
 460 #define XFS_BUF_ISWRITE(x)      ((x)->pb_flags & PBF_WRITE)
 461
 462 #define XFS_BUF_ISUNINITIAL(x)   (0)
 463 #define XFS_BUF_UNUNINITIAL(x)   (0)
 464
 465 #define XFS_BUF_BP_ISMAPPED(bp)  1
 466
 467 #define XFS_BUF_DATAIO(x)       ((x)->pb_flags |= PBF_FS_DATAIOD)
 468 #define XFS_BUF_UNDATAIO(x)     ((x)->pb_flags &= ~PBF_FS_DATAIOD)
 469
 470 #define XFS_BUF_IODONE_FUNC(buf)        (buf)->pb_iodone
 471 #define XFS_BUF_SET_IODONE_FUNC(buf, func)      \
 472                         (buf)->pb_iodone = (func)
 473 #define XFS_BUF_CLR_IODONE_FUNC(buf)            \
 474                         (buf)->pb_iodone = NULL
 475 #define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)     \
 476                         (buf)->pb_strat = (func)
 477 #define XFS_BUF_CLR_BDSTRAT_FUNC(buf)           \
 478                         (buf)->pb_strat = NULL
 479
 480 #define XFS_BUF_FSPRIVATE(buf, type)            \
 481                         ((type)(buf)->pb_fspriv)
 482 #define XFS_BUF_SET_FSPRIVATE(buf, value)       \
 483                         (buf)->pb_fspriv = (void *)(value)
 484 #define XFS_BUF_FSPRIVATE2(buf, type)           \
 485                         ((type)(buf)->pb_fspriv2)
 486 #define XFS_BUF_SET_FSPRIVATE2(buf, value)      \
 487                         (buf)->pb_fspriv2 = (void *)(value)
 488 #define XFS_BUF_FSPRIVATE3(buf, type)           \
 489                         ((type)(buf)->pb_fspriv3)
 490 #define XFS_BUF_SET_FSPRIVATE3(buf, value)      \
 491                         (buf)->pb_fspriv3  = (void *)(value)
 492 #define XFS_BUF_SET_START(buf)
 493
 494 #define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
 495                         (buf)->pb_relse = (value)
 496
 497 #define XFS_BUF_PTR(bp)         (xfs_caddr_t)((bp)->pb_addr)
 498
 499 extern inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
 500 {
 501         if (bp->pb_flags & PBF_MAPPED)
 502                 return XFS_BUF_PTR(bp) + offset;
 503         return (xfs_caddr_t) pagebuf_offset(bp, offset);
 504 }
 505
 506 #define XFS_BUF_SET_PTR(bp, val, count)         \
 507                                 pagebuf_associate_memory(bp, val, count)
 508 #define XFS_BUF_ADDR(bp)        ((bp)->pb_bn)
 509 #define XFS_BUF_SET_ADDR(bp, blk)               \
 510                         ((bp)->pb_bn = (xfs_daddr_t)(blk))
 511 #define XFS_BUF_OFFSET(bp)      ((bp)->pb_file_offset)
 512 #define XFS_BUF_SET_OFFSET(bp, off)             \
 513                         ((bp)->pb_file_offset = (off))
 514 #define XFS_BUF_COUNT(bp)       ((bp)->pb_count_desired)
 515 #define XFS_BUF_SET_COUNT(bp, cnt)              \
 516                         ((bp)->pb_count_desired = (cnt))
 517 #define XFS_BUF_SIZE(bp)        ((bp)->pb_buffer_length)
 518 #define XFS_BUF_SET_SIZE(bp, cnt)               \
 519                         ((bp)->pb_buffer_length = (cnt))
 520 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 521 #define XFS_BUF_SET_VTYPE(bp, type)
 522 #define XFS_BUF_SET_REF(bp, ref)
 523
 524 #define XFS_BUF_ISPINNED(bp)    pagebuf_ispin(bp)
 525
 526 #define XFS_BUF_VALUSEMA(bp)    pagebuf_lock_value(bp)
 527 #define XFS_BUF_CPSEMA(bp)      (pagebuf_cond_lock(bp) == 0)
 528 #define XFS_BUF_VSEMA(bp)       pagebuf_unlock(bp)
 529 #define XFS_BUF_PSEMA(bp,x)     pagebuf_lock(bp)
 530 #define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
 531
 532 /* setup the buffer target from a buftarg structure */
 533 #define XFS_BUF_SET_TARGET(bp, target)  \
 534                 (bp)->pb_target = (target)
 535 #define XFS_BUF_TARGET(bp)      ((bp)->pb_target)
 536 #define XFS_BUFTARG_NAME(target)        \
 537                 pagebuf_target_name(target)
 538
 539 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 540 #define XFS_BUF_SET_VTYPE(bp, type)
 541 #define XFS_BUF_SET_REF(bp, ref)
 542
 543 static inline int       xfs_bawrite(void *mp, xfs_buf_t *bp)
 544 {
 545         bp->pb_fspriv3 = mp;
 546         bp->pb_strat = xfs_bdstrat_cb;
 547         pagebuf_delwri_dequeue(bp);
 548         return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
 549 }
 550
 551 static inline void      xfs_buf_relse(xfs_buf_t *bp)
 552 {
 553         if (!bp->pb_relse)
 554                 pagebuf_unlock(bp);
 555         pagebuf_rele(bp);
 556 }
 557
 558 #define xfs_bpin(bp)            pagebuf_pin(bp)
 559 #define xfs_bunpin(bp)          pagebuf_unpin(bp)
 560
 561 #define xfs_buftrace(id, bp)    \
 562             pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
 563
 564 #define xfs_biodone(pb)             \
 565             pagebuf_iodone(pb, (pb->pb_flags & PBF_FS_DATAIOD), 0)
 566
 567 #define xfs_biomove(pb, off, len, data, rw) \
 568             pagebuf_iomove((pb), (off), (len), (data), \
 569                 ((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
 570
 571 #define xfs_biozero(pb, off, len) \
 572             pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
 573
 574
 575 static inline int       XFS_bwrite(xfs_buf_t *pb)
 576 {
 577         int     iowait = (pb->pb_flags & PBF_ASYNC) == 0;
 578         int     error = 0;
 579
 580         if (!iowait)
 581                 pb->pb_flags |= _PBF_RUN_QUEUES;
 582
 583         pagebuf_delwri_dequeue(pb);
 584         pagebuf_iostrategy(pb);
 585         if (iowait) {
 586                 error = pagebuf_iowait(pb);
 587                 xfs_buf_relse(pb);
 588         }
 589         return error;
 590 }
 591
 592 #define XFS_bdwrite(pb)              \
 593             pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
 594
 595 static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
 596 {
 597         bp->pb_strat = xfs_bdstrat_cb;
 598         bp->pb_fspriv3 = mp;
 599
 600         return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
 601 }
 602
 603 #define XFS_bdstrat(bp) pagebuf_iorequest(bp)
 604
 605 #define xfs_iowait(pb)  pagebuf_iowait(pb)
 606
 607 #define xfs_baread(target, rablkno, ralen)  \
 608         pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
 609
 610 #define xfs_buf_get_empty(len, target)  pagebuf_get_empty((len), (target))
 611 #define xfs_buf_get_noaddr(len, target) pagebuf_get_no_daddr((len), (target))
 612 #define xfs_buf_free(bp)                pagebuf_free(bp)
 613
 614  /*
 615   *     Handling of buftargs.
 616   */
 617
 618 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *);
 619 extern void xfs_free_buftarg(xfs_buftarg_t *, int);
 620 extern void xfs_wait_buftarg(xfs_buftarg_t *);
 621 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
 622 extern void xfs_incore_relse(xfs_buftarg_t *, int, int);
 623 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
 624
 625 #define xfs_getsize_buftarg(buftarg) \
 626         block_size((buftarg)->pbr_kdev)
 627 #define xfs_readonly_buftarg(buftarg) \
 628         is_read_only((buftarg)->pbr_kdev)
 629 #define xfs_binval(buftarg) \
 630         xfs_flush_buftarg(buftarg, 1)
 631 #define XFS_bflush(buftarg) \
 632         xfs_flush_buftarg(buftarg, 1)
 633
 634 #endif  /* __XFS_BUF_H__ */