2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
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.
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.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
34 * Written by Steve Lord, Jim Mostek, Russell Cattelan at SGI
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>
47 #include <linux/buffer_head.h>
48 #include <linux/uio.h>
54 #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
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)
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 */
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 */
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 */
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 */
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)
98 typedef struct xfs_buftarg {
100 struct block_device *pbr_bdev;
101 struct address_space *pbr_mapping;
102 unsigned int pbr_bsize;
103 unsigned int pbr_sshift;
108 * xfs_buf_t: Buffer structure for page cache-based buffers
110 * This buffer structure is used by the page cache buffer management routines
111 * to refer to an assembly of pages forming a logical buffer. The actual
112 * I/O is performed with buffer_head or bio structures, as required by drivers,
113 * for drivers which do not understand this structure. The buffer structure is
114 * used on temporary basis only, and discarded when released.
116 * The real data storage is recorded in the page cache. Metadata is
117 * hashed to the inode for the block device on which the file system resides.
118 * File data is hashed to the inode for the file. Pages which are only
119 * partially filled with data have bits set in their block_map entry
120 * to indicate which disk blocks in the page are not valid.
124 typedef void (*page_buf_iodone_t)(struct xfs_buf *);
125 /* call-back function on I/O completion */
126 typedef void (*page_buf_relse_t)(struct xfs_buf *);
127 /* call-back function on I/O completion */
128 typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
132 typedef struct xfs_buf {
133 struct semaphore pb_sema; /* semaphore for lockables */
134 unsigned long pb_queuetime; /* time buffer was queued */
135 atomic_t pb_pin_count; /* pin count */
136 wait_queue_head_t pb_waiters; /* unpin waiters */
137 struct list_head pb_list;
138 page_buf_flags_t pb_flags; /* status flags */
139 struct list_head pb_hash_list;
140 xfs_buftarg_t *pb_target; /* logical object */
141 atomic_t pb_hold; /* reference count */
142 xfs_daddr_t pb_bn; /* block number for I/O */
143 loff_t pb_file_offset; /* offset in file */
144 size_t pb_buffer_length; /* size of buffer in bytes */
145 size_t pb_count_desired; /* desired transfer size */
146 void *pb_addr; /* virtual address of buffer */
147 struct work_struct pb_iodone_work;
148 atomic_t pb_io_remaining;/* #outstanding I/O requests */
149 page_buf_iodone_t pb_iodone; /* I/O completion function */
150 page_buf_relse_t pb_relse; /* releasing function */
151 page_buf_bdstrat_t pb_strat; /* pre-write function */
152 struct semaphore pb_iodonesema; /* Semaphore for I/O waiters */
156 unsigned short pb_error; /* error code on I/O */
157 unsigned short pb_page_count; /* size of page array */
158 unsigned short pb_offset; /* page offset in first page */
159 unsigned char pb_locked; /* page array is locked */
160 unsigned char pb_hash_index; /* hash table index */
161 struct page **pb_pages; /* array of page pointers */
162 struct page *pb_page_array[PB_PAGES]; /* inline pages */
163 #ifdef PAGEBUF_LOCK_TRACKING
169 /* Finding and Reading Buffers */
171 extern xfs_buf_t *_pagebuf_find( /* find buffer for block if */
172 /* the block is in memory */
173 xfs_buftarg_t *, /* inode for block */
174 loff_t, /* starting offset of range */
175 size_t, /* length of range */
176 page_buf_flags_t, /* PBF_LOCK */
177 xfs_buf_t *); /* newly allocated buffer */
179 #define xfs_incore(buftarg,blkno,len,lockit) \
180 _pagebuf_find(buftarg, blkno ,len, lockit, NULL)
182 extern xfs_buf_t *xfs_buf_get_flags( /* allocate a buffer */
183 xfs_buftarg_t *, /* inode for buffer */
184 loff_t, /* starting offset of range */
185 size_t, /* length of range */
186 page_buf_flags_t); /* PBF_LOCK, PBF_READ, */
189 #define xfs_buf_get(target, blkno, len, flags) \
190 xfs_buf_get_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
192 extern xfs_buf_t *xfs_buf_read_flags( /* allocate and read a buffer */
193 xfs_buftarg_t *, /* inode for buffer */
194 loff_t, /* starting offset of range */
195 size_t, /* length of range */
196 page_buf_flags_t); /* PBF_LOCK, PBF_ASYNC */
198 #define xfs_buf_read(target, blkno, len, flags) \
199 xfs_buf_read_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
201 extern xfs_buf_t *pagebuf_lookup(
203 loff_t, /* starting offset of range */
204 size_t, /* length of range */
205 page_buf_flags_t); /* PBF_READ, PBF_WRITE, */
208 extern xfs_buf_t *pagebuf_get_empty( /* allocate pagebuf struct with */
209 /* no memory or disk address */
211 xfs_buftarg_t *); /* mount point "fake" inode */
213 extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct */
214 /* without disk address */
216 xfs_buftarg_t *); /* mount point "fake" inode */
218 extern int pagebuf_associate_memory(
223 extern void pagebuf_hold( /* increment reference count */
224 xfs_buf_t *); /* buffer to hold */
226 extern void pagebuf_readahead( /* read ahead into cache */
227 xfs_buftarg_t *, /* target for buffer (or NULL) */
228 loff_t, /* starting offset of range */
229 size_t, /* length of range */
230 page_buf_flags_t); /* additional read flags */
232 /* Releasing Buffers */
234 extern void pagebuf_free( /* deallocate a buffer */
235 xfs_buf_t *); /* buffer to deallocate */
237 extern void pagebuf_rele( /* release hold on a buffer */
238 xfs_buf_t *); /* buffer to release */
240 /* Locking and Unlocking Buffers */
242 extern int pagebuf_cond_lock( /* lock buffer, if not locked */
243 /* (returns -EBUSY if locked) */
244 xfs_buf_t *); /* buffer to lock */
246 extern int pagebuf_lock_value( /* return count on lock */
247 xfs_buf_t *); /* buffer to check */
249 extern int pagebuf_lock( /* lock buffer */
250 xfs_buf_t *); /* buffer to lock */
252 extern void pagebuf_unlock( /* unlock buffer */
253 xfs_buf_t *); /* buffer to unlock */
255 /* Buffer Read and Write Routines */
257 extern void pagebuf_iodone( /* mark buffer I/O complete */
258 xfs_buf_t *, /* buffer to mark */
259 int, /* use data/log helper thread. */
260 int); /* run completion locally, or in
261 * a helper thread. */
263 extern void pagebuf_ioerror( /* mark buffer in error (or not) */
264 xfs_buf_t *, /* buffer to mark */
265 int); /* error to store (0 if none) */
267 extern int pagebuf_iostart( /* start I/O on a buffer */
268 xfs_buf_t *, /* buffer to start */
269 page_buf_flags_t); /* PBF_LOCK, PBF_ASYNC, */
270 /* PBF_READ, PBF_WRITE, */
273 extern int pagebuf_iorequest( /* start real I/O */
274 xfs_buf_t *); /* buffer to convey to device */
276 extern int pagebuf_iowait( /* wait for buffer I/O done */
277 xfs_buf_t *); /* buffer to wait on */
279 extern void pagebuf_iomove( /* move data in/out of pagebuf */
280 xfs_buf_t *, /* buffer to manipulate */
281 size_t, /* starting buffer offset */
282 size_t, /* length in buffer */
283 caddr_t, /* data pointer */
284 page_buf_rw_t); /* direction */
286 static inline int pagebuf_iostrategy(xfs_buf_t *pb)
288 return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
291 static inline int pagebuf_geterror(xfs_buf_t *pb)
293 return pb ? pb->pb_error : ENOMEM;
296 /* Buffer Utility Routines */
298 extern caddr_t pagebuf_offset( /* pointer at offset in buffer */
299 xfs_buf_t *, /* buffer to offset into */
300 size_t); /* offset */
302 /* Pinning Buffer Storage in Memory */
304 extern void pagebuf_pin( /* pin buffer in memory */
305 xfs_buf_t *); /* buffer to pin */
307 extern void pagebuf_unpin( /* unpin buffered data */
308 xfs_buf_t *); /* buffer to unpin */
310 extern int pagebuf_ispin( /* check if buffer is pinned */
311 xfs_buf_t *); /* buffer to check */
313 /* Delayed Write Buffer Routines */
315 extern void pagebuf_delwri_dequeue(xfs_buf_t *);
317 /* Buffer Daemon Setup Routines */
319 extern int pagebuf_init(void);
320 extern void pagebuf_terminate(void);
324 extern ktrace_t *pagebuf_trace_buf;
325 extern void pagebuf_trace(
326 xfs_buf_t *, /* buffer being traced */
327 char *, /* description of operation */
328 void *, /* arbitrary diagnostic value */
329 void *); /* return address */
331 # define pagebuf_trace(pb, id, ptr, ra) do { } while (0)
334 #define pagebuf_target_name(target) \
335 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->pbr_bdev, __b); __b; })
341 /* These are just for xfs_syncsub... it sets an internal variable
342 * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
344 #define XFS_B_ASYNC PBF_ASYNC
345 #define XFS_B_DELWRI PBF_DELWRI
346 #define XFS_B_READ PBF_READ
347 #define XFS_B_WRITE PBF_WRITE
348 #define XFS_B_STALE PBF_STALE
350 #define XFS_BUF_TRYLOCK PBF_TRYLOCK
351 #define XFS_INCORE_TRYLOCK PBF_TRYLOCK
352 #define XFS_BUF_LOCK PBF_LOCK
353 #define XFS_BUF_MAPPED PBF_MAPPED
355 #define BUF_BUSY PBF_DONT_BLOCK
357 #define XFS_BUF_BFLAGS(x) ((x)->pb_flags)
358 #define XFS_BUF_ZEROFLAGS(x) \
359 ((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
361 #define XFS_BUF_STALE(x) ((x)->pb_flags |= XFS_B_STALE)
362 #define XFS_BUF_UNSTALE(x) ((x)->pb_flags &= ~XFS_B_STALE)
363 #define XFS_BUF_ISSTALE(x) ((x)->pb_flags & XFS_B_STALE)
364 #define XFS_BUF_SUPER_STALE(x) do { \
366 pagebuf_delwri_dequeue(x); \
370 #define XFS_BUF_MANAGE PBF_FS_MANAGED
371 #define XFS_BUF_UNMANAGE(x) ((x)->pb_flags &= ~PBF_FS_MANAGED)
373 #define XFS_BUF_DELAYWRITE(x) ((x)->pb_flags |= PBF_DELWRI)
374 #define XFS_BUF_UNDELAYWRITE(x) pagebuf_delwri_dequeue(x)
375 #define XFS_BUF_ISDELAYWRITE(x) ((x)->pb_flags & PBF_DELWRI)
377 #define XFS_BUF_ERROR(x,no) pagebuf_ioerror(x,no)
378 #define XFS_BUF_GETERROR(x) pagebuf_geterror(x)
379 #define XFS_BUF_ISERROR(x) (pagebuf_geterror(x)?1:0)
381 #define XFS_BUF_DONE(x) ((x)->pb_flags &= ~(PBF_PARTIAL|PBF_NONE))
382 #define XFS_BUF_UNDONE(x) ((x)->pb_flags |= PBF_PARTIAL|PBF_NONE)
383 #define XFS_BUF_ISDONE(x) (!(PBF_NOT_DONE(x)))
385 #define XFS_BUF_BUSY(x) ((x)->pb_flags |= PBF_FORCEIO)
386 #define XFS_BUF_UNBUSY(x) ((x)->pb_flags &= ~PBF_FORCEIO)
387 #define XFS_BUF_ISBUSY(x) (1)
389 #define XFS_BUF_ASYNC(x) ((x)->pb_flags |= PBF_ASYNC)
390 #define XFS_BUF_UNASYNC(x) ((x)->pb_flags &= ~PBF_ASYNC)
391 #define XFS_BUF_ISASYNC(x) ((x)->pb_flags & PBF_ASYNC)
393 #define XFS_BUF_FLUSH(x) ((x)->pb_flags |= PBF_FLUSH)
394 #define XFS_BUF_UNFLUSH(x) ((x)->pb_flags &= ~PBF_FLUSH)
395 #define XFS_BUF_ISFLUSH(x) ((x)->pb_flags & PBF_FLUSH)
397 #define XFS_BUF_SHUT(x) printk("XFS_BUF_SHUT not implemented yet\n")
398 #define XFS_BUF_UNSHUT(x) printk("XFS_BUF_UNSHUT not implemented yet\n")
399 #define XFS_BUF_ISSHUT(x) (0)
401 #define XFS_BUF_HOLD(x) pagebuf_hold(x)
402 #define XFS_BUF_READ(x) ((x)->pb_flags |= PBF_READ)
403 #define XFS_BUF_UNREAD(x) ((x)->pb_flags &= ~PBF_READ)
404 #define XFS_BUF_ISREAD(x) ((x)->pb_flags & PBF_READ)
406 #define XFS_BUF_WRITE(x) ((x)->pb_flags |= PBF_WRITE)
407 #define XFS_BUF_UNWRITE(x) ((x)->pb_flags &= ~PBF_WRITE)
408 #define XFS_BUF_ISWRITE(x) ((x)->pb_flags & PBF_WRITE)
410 #define XFS_BUF_ISUNINITIAL(x) (0)
411 #define XFS_BUF_UNUNINITIAL(x) (0)
413 #define XFS_BUF_BP_ISMAPPED(bp) 1
415 #define XFS_BUF_DATAIO(x) ((x)->pb_flags |= PBF_FS_DATAIOD)
416 #define XFS_BUF_UNDATAIO(x) ((x)->pb_flags &= ~PBF_FS_DATAIOD)
418 #define XFS_BUF_IODONE_FUNC(buf) (buf)->pb_iodone
419 #define XFS_BUF_SET_IODONE_FUNC(buf, func) \
420 (buf)->pb_iodone = (func)
421 #define XFS_BUF_CLR_IODONE_FUNC(buf) \
422 (buf)->pb_iodone = NULL
423 #define XFS_BUF_SET_BDSTRAT_FUNC(buf, func) \
424 (buf)->pb_strat = (func)
425 #define XFS_BUF_CLR_BDSTRAT_FUNC(buf) \
426 (buf)->pb_strat = NULL
428 #define XFS_BUF_FSPRIVATE(buf, type) \
429 ((type)(buf)->pb_fspriv)
430 #define XFS_BUF_SET_FSPRIVATE(buf, value) \
431 (buf)->pb_fspriv = (void *)(value)
432 #define XFS_BUF_FSPRIVATE2(buf, type) \
433 ((type)(buf)->pb_fspriv2)
434 #define XFS_BUF_SET_FSPRIVATE2(buf, value) \
435 (buf)->pb_fspriv2 = (void *)(value)
436 #define XFS_BUF_FSPRIVATE3(buf, type) \
437 ((type)(buf)->pb_fspriv3)
438 #define XFS_BUF_SET_FSPRIVATE3(buf, value) \
439 (buf)->pb_fspriv3 = (void *)(value)
440 #define XFS_BUF_SET_START(buf)
442 #define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
443 (buf)->pb_relse = (value)
445 #define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->pb_addr)
447 extern inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
449 if (bp->pb_flags & PBF_MAPPED)
450 return XFS_BUF_PTR(bp) + offset;
451 return (xfs_caddr_t) pagebuf_offset(bp, offset);
454 #define XFS_BUF_SET_PTR(bp, val, count) \
455 pagebuf_associate_memory(bp, val, count)
456 #define XFS_BUF_ADDR(bp) ((bp)->pb_bn)
457 #define XFS_BUF_SET_ADDR(bp, blk) \
458 ((bp)->pb_bn = (blk))
459 #define XFS_BUF_OFFSET(bp) ((bp)->pb_file_offset)
460 #define XFS_BUF_SET_OFFSET(bp, off) \
461 ((bp)->pb_file_offset = (off))
462 #define XFS_BUF_COUNT(bp) ((bp)->pb_count_desired)
463 #define XFS_BUF_SET_COUNT(bp, cnt) \
464 ((bp)->pb_count_desired = (cnt))
465 #define XFS_BUF_SIZE(bp) ((bp)->pb_buffer_length)
466 #define XFS_BUF_SET_SIZE(bp, cnt) \
467 ((bp)->pb_buffer_length = (cnt))
468 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
469 #define XFS_BUF_SET_VTYPE(bp, type)
470 #define XFS_BUF_SET_REF(bp, ref)
472 #define XFS_BUF_ISPINNED(bp) pagebuf_ispin(bp)
474 #define XFS_BUF_VALUSEMA(bp) pagebuf_lock_value(bp)
475 #define XFS_BUF_CPSEMA(bp) (pagebuf_cond_lock(bp) == 0)
476 #define XFS_BUF_VSEMA(bp) pagebuf_unlock(bp)
477 #define XFS_BUF_PSEMA(bp,x) pagebuf_lock(bp)
478 #define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
480 /* setup the buffer target from a buftarg structure */
481 #define XFS_BUF_SET_TARGET(bp, target) \
482 (bp)->pb_target = (target)
483 #define XFS_BUF_TARGET(bp) ((bp)->pb_target)
484 #define XFS_BUFTARG_NAME(target) \
485 pagebuf_target_name(target)
487 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
488 #define XFS_BUF_SET_VTYPE(bp, type)
489 #define XFS_BUF_SET_REF(bp, ref)
491 static inline int xfs_bawrite(void *mp, xfs_buf_t *bp)
494 bp->pb_strat = xfs_bdstrat_cb;
495 pagebuf_delwri_dequeue(bp);
496 return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
499 static inline void xfs_buf_relse(xfs_buf_t *bp)
506 #define xfs_bpin(bp) pagebuf_pin(bp)
507 #define xfs_bunpin(bp) pagebuf_unpin(bp)
509 #define xfs_buftrace(id, bp) \
510 pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
512 #define xfs_biodone(pb) \
513 pagebuf_iodone(pb, (pb->pb_flags & PBF_FS_DATAIOD), 0)
515 #define xfs_biomove(pb, off, len, data, rw) \
516 pagebuf_iomove((pb), (off), (len), (data), \
517 ((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
519 #define xfs_biozero(pb, off, len) \
520 pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
523 static inline int XFS_bwrite(xfs_buf_t *pb)
525 int iowait = (pb->pb_flags & PBF_ASYNC) == 0;
529 pb->pb_flags |= _PBF_RUN_QUEUES;
531 pagebuf_delwri_dequeue(pb);
532 pagebuf_iostrategy(pb);
534 error = pagebuf_iowait(pb);
540 #define XFS_bdwrite(pb) \
541 pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
543 static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
545 bp->pb_strat = xfs_bdstrat_cb;
548 return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
551 #define XFS_bdstrat(bp) pagebuf_iorequest(bp)
553 #define xfs_iowait(pb) pagebuf_iowait(pb)
555 #define xfs_baread(target, rablkno, ralen) \
556 pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
558 #define xfs_buf_get_empty(len, target) pagebuf_get_empty((len), (target))
559 #define xfs_buf_get_noaddr(len, target) pagebuf_get_no_daddr((len), (target))
560 #define xfs_buf_free(bp) pagebuf_free(bp)
564 * Handling of buftargs.
567 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *);
568 extern void xfs_free_buftarg(xfs_buftarg_t *, int);
569 extern void xfs_wait_buftarg(xfs_buftarg_t *);
570 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
571 extern void xfs_incore_relse(xfs_buftarg_t *, int, int);
572 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
574 #define xfs_getsize_buftarg(buftarg) \
575 block_size((buftarg)->pbr_bdev)
576 #define xfs_readonly_buftarg(buftarg) \
577 bdev_read_only((buftarg)->pbr_bdev)
578 #define xfs_binval(buftarg) \
579 xfs_flush_buftarg(buftarg, 1)
580 #define XFS_bflush(buftarg) \
581 xfs_flush_buftarg(buftarg, 1)
583 #endif /* __XFS_BUF_H__ */