fs/xfs/linux-2.6/xfs_buf.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_BUF_H__
  19 #define __XFS_BUF_H__
  20
  21 #include <linux/config.h>
  22 #include <linux/list.h>
  23 #include <linux/types.h>
  24 #include <linux/spinlock.h>
  25 #include <asm/system.h>
  26 #include <linux/mm.h>
  27 #include <linux/fs.h>
  28 #include <linux/buffer_head.h>
  29 #include <linux/uio.h>
  30
  31 /*
  32  *      Base types
  33  */
  34
  35 #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
  36
  37 #define page_buf_ctob(pp)       ((pp) * PAGE_CACHE_SIZE)
  38 #define page_buf_btoc(dd)       (((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
  39 #define page_buf_btoct(dd)      ((dd) >> PAGE_CACHE_SHIFT)
  40 #define page_buf_poff(aa)       ((aa) & ~PAGE_CACHE_MASK)
  41
  42 typedef enum page_buf_rw_e {
  43         PBRW_READ = 1,                  /* transfer into target memory */
  44         PBRW_WRITE = 2,                 /* transfer from target memory */
  45         PBRW_ZERO = 3                   /* Zero target memory */
  46 } page_buf_rw_t;
  47
  48
  49 typedef enum page_buf_flags_e {         /* pb_flags values */
  50         PBF_READ = (1 << 0),    /* buffer intended for reading from device */
  51         PBF_WRITE = (1 << 1),   /* buffer intended for writing to device   */
  52         PBF_MAPPED = (1 << 2),  /* buffer mapped (pb_addr valid)           */
  53         PBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
  54         PBF_DONE = (1 << 5),    /* all pages in the buffer uptodate        */
  55         PBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
  56         PBF_STALE = (1 << 7),   /* buffer has been staled, do not find it  */
  57         PBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
  58         PBF_ORDERED = (1 << 11),    /* use ordered writes                  */
  59         PBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead             */
  60
  61         /* flags used only as arguments to access routines */
  62         PBF_LOCK = (1 << 14),       /* lock requested                      */
  63         PBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait     */
  64         PBF_DONT_BLOCK = (1 << 16), /* do not block in current thread      */
  65
  66         /* flags used only internally */
  67         _PBF_PAGE_CACHE = (1 << 17),/* backed by pagecache                 */
  68         _PBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()              */
  69         _PBF_RUN_QUEUES = (1 << 19),/* run block device task queue         */
  70         _PBF_DELWRI_Q = (1 << 21),   /* buffer on delwri queue             */
  71 } page_buf_flags_t;
  72
  73
  74 typedef struct xfs_bufhash {
  75         struct list_head        bh_list;
  76         spinlock_t              bh_lock;
  77 } xfs_bufhash_t;
  78
  79 typedef struct xfs_buftarg {
  80         dev_t                   pbr_dev;
  81         struct block_device     *pbr_bdev;
  82         struct address_space    *pbr_mapping;
  83         unsigned int            pbr_bsize;
  84         unsigned int            pbr_sshift;
  85         size_t                  pbr_smask;
  86
  87         /* per-device buffer hash table */
  88         uint                    bt_hashmask;
  89         uint                    bt_hashshift;
  90         xfs_bufhash_t           *bt_hash;
  91 } xfs_buftarg_t;
  92
  93 /*
  94  *      xfs_buf_t:  Buffer structure for page cache-based buffers
  95  *
  96  * This buffer structure is used by the page cache buffer management routines
  97  * to refer to an assembly of pages forming a logical buffer.  The actual I/O
  98  * is performed with buffer_head structures, as required by drivers.
  99  *
 100  * The buffer structure is used on temporary basis only, and discarded when
 101  * released.  The real data storage is recorded in the page cache.  Metadata is
 102  * hashed to the block device on which the file system resides.
 103  */
 104
 105 struct xfs_buf;
 106
 107 /* call-back function on I/O completion */
 108 typedef void (*page_buf_iodone_t)(struct xfs_buf *);
 109 /* call-back function on I/O completion */
 110 typedef void (*page_buf_relse_t)(struct xfs_buf *);
 111 /* pre-write function */
 112 typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
 113
 114 #define PB_PAGES        2
 115
 116 typedef struct xfs_buf {
 117         struct semaphore        pb_sema;        /* semaphore for lockables  */
 118         unsigned long           pb_queuetime;   /* time buffer was queued   */
 119         atomic_t                pb_pin_count;   /* pin count                */
 120         wait_queue_head_t       pb_waiters;     /* unpin waiters            */
 121         struct list_head        pb_list;
 122         page_buf_flags_t        pb_flags;       /* status flags */
 123         struct list_head        pb_hash_list;   /* hash table list */
 124         xfs_bufhash_t           *pb_hash;       /* hash table list start */
 125         xfs_buftarg_t           *pb_target;     /* buffer target (device) */
 126         atomic_t                pb_hold;        /* reference count */
 127         xfs_daddr_t             pb_bn;          /* block number for I/O */
 128         loff_t                  pb_file_offset; /* offset in file */
 129         size_t                  pb_buffer_length; /* size of buffer in bytes */
 130         size_t                  pb_count_desired; /* desired transfer size */
 131         void                    *pb_addr;       /* virtual address of buffer */
 132         struct work_struct      pb_iodone_work;
 133         atomic_t                pb_io_remaining;/* #outstanding I/O requests */
 134         page_buf_iodone_t       pb_iodone;      /* I/O completion function */
 135         page_buf_relse_t        pb_relse;       /* releasing function */
 136         page_buf_bdstrat_t      pb_strat;       /* pre-write function */
 137         struct semaphore        pb_iodonesema;  /* Semaphore for I/O waiters */
 138         void                    *pb_fspriv;
 139         void                    *pb_fspriv2;
 140         void                    *pb_fspriv3;
 141         unsigned short          pb_error;       /* error code on I/O */
 142         unsigned short          pb_locked;      /* page array is locked */
 143         unsigned int            pb_page_count;  /* size of page array */
 144         unsigned int            pb_offset;      /* page offset in first page */
 145         struct page             **pb_pages;     /* array of page pointers */
 146         struct page             *pb_page_array[PB_PAGES]; /* inline pages */
 147 #ifdef PAGEBUF_LOCK_TRACKING
 148         int                     pb_last_holder;
 149 #endif
 150 } xfs_buf_t;
 151
 152
 153 /* Finding and Reading Buffers */
 154
 155 extern xfs_buf_t *_pagebuf_find(        /* find buffer for block if     */
 156                                         /* the block is in memory       */
 157                 xfs_buftarg_t *,        /* inode for block              */
 158                 loff_t,                 /* starting offset of range     */
 159                 size_t,                 /* length of range              */
 160                 page_buf_flags_t,       /* PBF_LOCK                     */
 161                 xfs_buf_t *);           /* newly allocated buffer       */
 162
 163 #define xfs_incore(buftarg,blkno,len,lockit) \
 164         _pagebuf_find(buftarg, blkno ,len, lockit, NULL)
 165
 166 extern xfs_buf_t *xfs_buf_get_flags(    /* allocate a buffer            */
 167                 xfs_buftarg_t *,        /* inode for buffer             */
 168                 loff_t,                 /* starting offset of range     */
 169                 size_t,                 /* length of range              */
 170                 page_buf_flags_t);      /* PBF_LOCK, PBF_READ,          */
 171                                         /* PBF_ASYNC                    */
 172
 173 #define xfs_buf_get(target, blkno, len, flags) \
 174         xfs_buf_get_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 175
 176 extern xfs_buf_t *xfs_buf_read_flags(   /* allocate and read a buffer   */
 177                 xfs_buftarg_t *,        /* inode for buffer             */
 178                 loff_t,                 /* starting offset of range     */
 179                 size_t,                 /* length of range              */
 180                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC          */
 181
 182 #define xfs_buf_read(target, blkno, len, flags) \
 183         xfs_buf_read_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
 184
 185 extern xfs_buf_t *pagebuf_get_empty(    /* allocate pagebuf struct with */
 186                                         /*  no memory or disk address   */
 187                 size_t len,
 188                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 189
 190 extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct       */
 191                                         /* without disk address         */
 192                 size_t len,
 193                 xfs_buftarg_t *);       /* mount point "fake" inode     */
 194
 195 extern int pagebuf_associate_memory(
 196                 xfs_buf_t *,
 197                 void *,
 198                 size_t);
 199
 200 extern void pagebuf_hold(               /* increment reference count    */
 201                 xfs_buf_t *);           /* buffer to hold               */
 202
 203 extern void pagebuf_readahead(          /* read ahead into cache        */
 204                 xfs_buftarg_t  *,       /* target for buffer (or NULL)  */
 205                 loff_t,                 /* starting offset of range     */
 206                 size_t,                 /* length of range              */
 207                 page_buf_flags_t);      /* additional read flags        */
 208
 209 /* Releasing Buffers */
 210
 211 extern void pagebuf_free(               /* deallocate a buffer          */
 212                 xfs_buf_t *);           /* buffer to deallocate         */
 213
 214 extern void pagebuf_rele(               /* release hold on a buffer     */
 215                 xfs_buf_t *);           /* buffer to release            */
 216
 217 /* Locking and Unlocking Buffers */
 218
 219 extern int pagebuf_cond_lock(           /* lock buffer, if not locked   */
 220                                         /* (returns -EBUSY if locked)   */
 221                 xfs_buf_t *);           /* buffer to lock               */
 222
 223 extern int pagebuf_lock_value(          /* return count on lock         */
 224                 xfs_buf_t *);          /* buffer to check              */
 225
 226 extern int pagebuf_lock(                /* lock buffer                  */
 227                 xfs_buf_t *);          /* buffer to lock               */
 228
 229 extern void pagebuf_unlock(             /* unlock buffer                */
 230                 xfs_buf_t *);           /* buffer to unlock             */
 231
 232 /* Buffer Read and Write Routines */
 233
 234 extern void pagebuf_iodone(             /* mark buffer I/O complete     */
 235                 xfs_buf_t *,            /* buffer to mark               */
 236                 int);                   /* run completion locally, or in
 237                                          * a helper thread.             */
 238
 239 extern void pagebuf_ioerror(            /* mark buffer in error (or not) */
 240                 xfs_buf_t *,            /* buffer to mark               */
 241                 int);                   /* error to store (0 if none)   */
 242
 243 extern int pagebuf_iostart(             /* start I/O on a buffer        */
 244                 xfs_buf_t *,            /* buffer to start              */
 245                 page_buf_flags_t);      /* PBF_LOCK, PBF_ASYNC,         */
 246                                         /* PBF_READ, PBF_WRITE,         */
 247                                         /* PBF_DELWRI                   */
 248
 249 extern int pagebuf_iorequest(           /* start real I/O               */
 250                 xfs_buf_t *);           /* buffer to convey to device   */
 251
 252 extern int pagebuf_iowait(              /* wait for buffer I/O done     */
 253                 xfs_buf_t *);           /* buffer to wait on            */
 254
 255 extern void pagebuf_iomove(             /* move data in/out of pagebuf  */
 256                 xfs_buf_t *,            /* buffer to manipulate         */
 257                 size_t,                 /* starting buffer offset       */
 258                 size_t,                 /* length in buffer             */
 259                 caddr_t,                /* data pointer                 */
 260                 page_buf_rw_t);         /* direction                    */
 261
 262 static inline int pagebuf_iostrategy(xfs_buf_t *pb)
 263 {
 264         return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
 265 }
 266
 267 static inline int pagebuf_geterror(xfs_buf_t *pb)
 268 {
 269         return pb ? pb->pb_error : ENOMEM;
 270 }
 271
 272 /* Buffer Utility Routines */
 273
 274 extern caddr_t pagebuf_offset(          /* pointer at offset in buffer  */
 275                 xfs_buf_t *,            /* buffer to offset into        */
 276                 size_t);                /* offset                       */
 277
 278 /* Pinning Buffer Storage in Memory */
 279
 280 extern void pagebuf_pin(                /* pin buffer in memory         */
 281                 xfs_buf_t *);           /* buffer to pin                */
 282
 283 extern void pagebuf_unpin(              /* unpin buffered data          */
 284                 xfs_buf_t *);           /* buffer to unpin              */
 285
 286 extern int pagebuf_ispin(               /* check if buffer is pinned    */
 287                 xfs_buf_t *);           /* buffer to check              */
 288
 289 /* Delayed Write Buffer Routines */
 290
 291 extern void pagebuf_delwri_dequeue(xfs_buf_t *);
 292
 293 /* Buffer Daemon Setup Routines */
 294
 295 extern int pagebuf_init(void);
 296 extern void pagebuf_terminate(void);
 297
 298
 299 #ifdef PAGEBUF_TRACE
 300 extern ktrace_t *pagebuf_trace_buf;
 301 extern void pagebuf_trace(
 302                 xfs_buf_t *,            /* buffer being traced          */
 303                 char *,                 /* description of operation     */
 304                 void *,                 /* arbitrary diagnostic value   */
 305                 void *);                /* return address               */
 306 #else
 307 # define pagebuf_trace(pb, id, ptr, ra) do { } while (0)
 308 #endif
 309
 310 #define pagebuf_target_name(target)     \
 311         ({ char __b[BDEVNAME_SIZE]; bdevname((target)->pbr_bdev, __b); __b; })
 312
 313
 314
 315 /* These are just for xfs_syncsub... it sets an internal variable
 316  * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
 317  */
 318 #define XFS_B_ASYNC             PBF_ASYNC
 319 #define XFS_B_DELWRI            PBF_DELWRI
 320 #define XFS_B_READ              PBF_READ
 321 #define XFS_B_WRITE             PBF_WRITE
 322 #define XFS_B_STALE             PBF_STALE
 323
 324 #define XFS_BUF_TRYLOCK         PBF_TRYLOCK
 325 #define XFS_INCORE_TRYLOCK      PBF_TRYLOCK
 326 #define XFS_BUF_LOCK            PBF_LOCK
 327 #define XFS_BUF_MAPPED          PBF_MAPPED
 328
 329 #define BUF_BUSY                PBF_DONT_BLOCK
 330
 331 #define XFS_BUF_BFLAGS(x)       ((x)->pb_flags)
 332 #define XFS_BUF_ZEROFLAGS(x)    \
 333         ((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
 334
 335 #define XFS_BUF_STALE(x)        ((x)->pb_flags |= XFS_B_STALE)
 336 #define XFS_BUF_UNSTALE(x)      ((x)->pb_flags &= ~XFS_B_STALE)
 337 #define XFS_BUF_ISSTALE(x)      ((x)->pb_flags & XFS_B_STALE)
 338 #define XFS_BUF_SUPER_STALE(x)  do {                            \
 339                                         XFS_BUF_STALE(x);       \
 340                                         pagebuf_delwri_dequeue(x);      \
 341                                         XFS_BUF_DONE(x);        \
 342                                 } while (0)
 343
 344 #define XFS_BUF_MANAGE          PBF_FS_MANAGED
 345 #define XFS_BUF_UNMANAGE(x)     ((x)->pb_flags &= ~PBF_FS_MANAGED)
 346
 347 #define XFS_BUF_DELAYWRITE(x)    ((x)->pb_flags |= PBF_DELWRI)
 348 #define XFS_BUF_UNDELAYWRITE(x)  pagebuf_delwri_dequeue(x)
 349 #define XFS_BUF_ISDELAYWRITE(x)  ((x)->pb_flags & PBF_DELWRI)
 350
 351 #define XFS_BUF_ERROR(x,no)      pagebuf_ioerror(x,no)
 352 #define XFS_BUF_GETERROR(x)      pagebuf_geterror(x)
 353 #define XFS_BUF_ISERROR(x)       (pagebuf_geterror(x)?1:0)
 354
 355 #define XFS_BUF_DONE(x)          ((x)->pb_flags |= PBF_DONE)
 356 #define XFS_BUF_UNDONE(x)        ((x)->pb_flags &= ~PBF_DONE)
 357 #define XFS_BUF_ISDONE(x)        ((x)->pb_flags & PBF_DONE)
 358
 359 #define XFS_BUF_BUSY(x)          do { } while (0)
 360 #define XFS_BUF_UNBUSY(x)        do { } while (0)
 361 #define XFS_BUF_ISBUSY(x)        (1)
 362
 363 #define XFS_BUF_ASYNC(x)         ((x)->pb_flags |= PBF_ASYNC)
 364 #define XFS_BUF_UNASYNC(x)       ((x)->pb_flags &= ~PBF_ASYNC)
 365 #define XFS_BUF_ISASYNC(x)       ((x)->pb_flags & PBF_ASYNC)
 366
 367 #define XFS_BUF_ORDERED(x)       ((x)->pb_flags |= PBF_ORDERED)
 368 #define XFS_BUF_UNORDERED(x)     ((x)->pb_flags &= ~PBF_ORDERED)
 369 #define XFS_BUF_ISORDERED(x)     ((x)->pb_flags & PBF_ORDERED)
 370
 371 #define XFS_BUF_SHUT(x)          printk("XFS_BUF_SHUT not implemented yet\n")
 372 #define XFS_BUF_UNSHUT(x)        printk("XFS_BUF_UNSHUT not implemented yet\n")
 373 #define XFS_BUF_ISSHUT(x)        (0)
 374
 375 #define XFS_BUF_HOLD(x)         pagebuf_hold(x)
 376 #define XFS_BUF_READ(x)         ((x)->pb_flags |= PBF_READ)
 377 #define XFS_BUF_UNREAD(x)       ((x)->pb_flags &= ~PBF_READ)
 378 #define XFS_BUF_ISREAD(x)       ((x)->pb_flags & PBF_READ)
 379
 380 #define XFS_BUF_WRITE(x)        ((x)->pb_flags |= PBF_WRITE)
 381 #define XFS_BUF_UNWRITE(x)      ((x)->pb_flags &= ~PBF_WRITE)
 382 #define XFS_BUF_ISWRITE(x)      ((x)->pb_flags & PBF_WRITE)
 383
 384 #define XFS_BUF_ISUNINITIAL(x)   (0)
 385 #define XFS_BUF_UNUNINITIAL(x)   (0)
 386
 387 #define XFS_BUF_BP_ISMAPPED(bp)  1
 388
 389 #define XFS_BUF_IODONE_FUNC(buf)        (buf)->pb_iodone
 390 #define XFS_BUF_SET_IODONE_FUNC(buf, func)      \
 391                         (buf)->pb_iodone = (func)
 392 #define XFS_BUF_CLR_IODONE_FUNC(buf)            \
 393                         (buf)->pb_iodone = NULL
 394 #define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)     \
 395                         (buf)->pb_strat = (func)
 396 #define XFS_BUF_CLR_BDSTRAT_FUNC(buf)           \
 397                         (buf)->pb_strat = NULL
 398
 399 #define XFS_BUF_FSPRIVATE(buf, type)            \
 400                         ((type)(buf)->pb_fspriv)
 401 #define XFS_BUF_SET_FSPRIVATE(buf, value)       \
 402                         (buf)->pb_fspriv = (void *)(value)
 403 #define XFS_BUF_FSPRIVATE2(buf, type)           \
 404                         ((type)(buf)->pb_fspriv2)
 405 #define XFS_BUF_SET_FSPRIVATE2(buf, value)      \
 406                         (buf)->pb_fspriv2 = (void *)(value)
 407 #define XFS_BUF_FSPRIVATE3(buf, type)           \
 408                         ((type)(buf)->pb_fspriv3)
 409 #define XFS_BUF_SET_FSPRIVATE3(buf, value)      \
 410                         (buf)->pb_fspriv3  = (void *)(value)
 411 #define XFS_BUF_SET_START(buf)
 412
 413 #define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
 414                         (buf)->pb_relse = (value)
 415
 416 #define XFS_BUF_PTR(bp)         (xfs_caddr_t)((bp)->pb_addr)
 417
 418 static inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
 419 {
 420         if (bp->pb_flags & PBF_MAPPED)
 421                 return XFS_BUF_PTR(bp) + offset;
 422         return (xfs_caddr_t) pagebuf_offset(bp, offset);
 423 }
 424
 425 #define XFS_BUF_SET_PTR(bp, val, count)         \
 426                                 pagebuf_associate_memory(bp, val, count)
 427 #define XFS_BUF_ADDR(bp)        ((bp)->pb_bn)
 428 #define XFS_BUF_SET_ADDR(bp, blk)               \
 429                         ((bp)->pb_bn = (xfs_daddr_t)(blk))
 430 #define XFS_BUF_OFFSET(bp)      ((bp)->pb_file_offset)
 431 #define XFS_BUF_SET_OFFSET(bp, off)             \
 432                         ((bp)->pb_file_offset = (off))
 433 #define XFS_BUF_COUNT(bp)       ((bp)->pb_count_desired)
 434 #define XFS_BUF_SET_COUNT(bp, cnt)              \
 435                         ((bp)->pb_count_desired = (cnt))
 436 #define XFS_BUF_SIZE(bp)        ((bp)->pb_buffer_length)
 437 #define XFS_BUF_SET_SIZE(bp, cnt)               \
 438                         ((bp)->pb_buffer_length = (cnt))
 439 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 440 #define XFS_BUF_SET_VTYPE(bp, type)
 441 #define XFS_BUF_SET_REF(bp, ref)
 442
 443 #define XFS_BUF_ISPINNED(bp)    pagebuf_ispin(bp)
 444
 445 #define XFS_BUF_VALUSEMA(bp)    pagebuf_lock_value(bp)
 446 #define XFS_BUF_CPSEMA(bp)      (pagebuf_cond_lock(bp) == 0)
 447 #define XFS_BUF_VSEMA(bp)       pagebuf_unlock(bp)
 448 #define XFS_BUF_PSEMA(bp,x)     pagebuf_lock(bp)
 449 #define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
 450
 451 /* setup the buffer target from a buftarg structure */
 452 #define XFS_BUF_SET_TARGET(bp, target)  \
 453                 (bp)->pb_target = (target)
 454 #define XFS_BUF_TARGET(bp)      ((bp)->pb_target)
 455 #define XFS_BUFTARG_NAME(target)        \
 456                 pagebuf_target_name(target)
 457
 458 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 459 #define XFS_BUF_SET_VTYPE(bp, type)
 460 #define XFS_BUF_SET_REF(bp, ref)
 461
 462 static inline int       xfs_bawrite(void *mp, xfs_buf_t *bp)
 463 {
 464         bp->pb_fspriv3 = mp;
 465         bp->pb_strat = xfs_bdstrat_cb;
 466         pagebuf_delwri_dequeue(bp);
 467         return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
 468 }
 469
 470 static inline void      xfs_buf_relse(xfs_buf_t *bp)
 471 {
 472         if (!bp->pb_relse)
 473                 pagebuf_unlock(bp);
 474         pagebuf_rele(bp);
 475 }
 476
 477 #define xfs_bpin(bp)            pagebuf_pin(bp)
 478 #define xfs_bunpin(bp)          pagebuf_unpin(bp)
 479
 480 #define xfs_buftrace(id, bp)    \
 481             pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
 482
 483 #define xfs_biodone(pb)             \
 484             pagebuf_iodone(pb, 0)
 485
 486 #define xfs_biomove(pb, off, len, data, rw) \
 487             pagebuf_iomove((pb), (off), (len), (data), \
 488                 ((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
 489
 490 #define xfs_biozero(pb, off, len) \
 491             pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
 492
 493
 494 static inline int       XFS_bwrite(xfs_buf_t *pb)
 495 {
 496         int     iowait = (pb->pb_flags & PBF_ASYNC) == 0;
 497         int     error = 0;
 498
 499         if (!iowait)
 500                 pb->pb_flags |= _PBF_RUN_QUEUES;
 501
 502         pagebuf_delwri_dequeue(pb);
 503         pagebuf_iostrategy(pb);
 504         if (iowait) {
 505                 error = pagebuf_iowait(pb);
 506                 xfs_buf_relse(pb);
 507         }
 508         return error;
 509 }
 510
 511 #define XFS_bdwrite(pb)              \
 512             pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
 513
 514 static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
 515 {
 516         bp->pb_strat = xfs_bdstrat_cb;
 517         bp->pb_fspriv3 = mp;
 518
 519         return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
 520 }
 521
 522 #define XFS_bdstrat(bp) pagebuf_iorequest(bp)
 523
 524 #define xfs_iowait(pb)  pagebuf_iowait(pb)
 525
 526 #define xfs_baread(target, rablkno, ralen)  \
 527         pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
 528
 529 #define xfs_buf_get_empty(len, target)  pagebuf_get_empty((len), (target))
 530 #define xfs_buf_get_noaddr(len, target) pagebuf_get_no_daddr((len), (target))
 531 #define xfs_buf_free(bp)                pagebuf_free(bp)
 532
 533
 534 /*
 535  *      Handling of buftargs.
 536  */
 537
 538 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
 539 extern void xfs_free_buftarg(xfs_buftarg_t *, int);
 540 extern void xfs_wait_buftarg(xfs_buftarg_t *);
 541 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
 542 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
 543
 544 #define xfs_getsize_buftarg(buftarg) \
 545         block_size((buftarg)->pbr_bdev)
 546 #define xfs_readonly_buftarg(buftarg) \
 547         bdev_read_only((buftarg)->pbr_bdev)
 548 #define xfs_binval(buftarg) \
 549         xfs_flush_buftarg(buftarg, 1)
 550 #define XFS_bflush(buftarg) \
 551         xfs_flush_buftarg(buftarg, 1)
 552
 553 #endif  /* __XFS_BUF_H__ */