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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
61typedef 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
68typedef 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
98typedef struct xfs_bufhash {
99 struct list_head bh_list;
100 spinlock_t bh_lock;
101} xfs_bufhash_t;
102
103typedef 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
129struct xfs_buf;
130
131/* call-back function on I/O completion */
132typedef void (*page_buf_iodone_t)(struct xfs_buf *);
133/* call-back function on I/O completion */
134typedef void (*page_buf_relse_t)(struct xfs_buf *);
135/* pre-write function */
136typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
137
138#define PB_PAGES 2
139
140typedef 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
179extern 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
190extern 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
200extern 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
209extern 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
216extern 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
221extern 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
226extern int pagebuf_associate_memory(
227 xfs_buf_t *,
228 void *,
229 size_t);
230
231extern void pagebuf_hold( /* increment reference count */
232 xfs_buf_t *); /* buffer to hold */
233
234extern 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
242extern void pagebuf_free( /* deallocate a buffer */
243 xfs_buf_t *); /* buffer to deallocate */
244
245extern void pagebuf_rele( /* release hold on a buffer */
246 xfs_buf_t *); /* buffer to release */
247
248/* Locking and Unlocking Buffers */
249
250extern int pagebuf_cond_lock( /* lock buffer, if not locked */
251 /* (returns -EBUSY if locked) */
252 xfs_buf_t *); /* buffer to lock */
253
254extern int pagebuf_lock_value( /* return count on lock */
255 xfs_buf_t *); /* buffer to check */
256
257extern int pagebuf_lock( /* lock buffer */
258 xfs_buf_t *); /* buffer to lock */
259
260extern void pagebuf_unlock( /* unlock buffer */
261 xfs_buf_t *); /* buffer to unlock */
262
263/* Buffer Read and Write Routines */
264
265extern 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
271extern 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
275extern 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
281extern int pagebuf_iorequest( /* start real I/O */
282 xfs_buf_t *); /* buffer to convey to device */
283
284extern int pagebuf_iowait( /* wait for buffer I/O done */
285 xfs_buf_t *); /* buffer to wait on */
286
287extern 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
294static inline int pagebuf_iostrategy(xfs_buf_t *pb)
295{
296 return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
297}
298
299static inline int pagebuf_geterror(xfs_buf_t *pb)
300{
301 return pb ? pb->pb_error : ENOMEM;
302}
303
304/* Buffer Utility Routines */
305
306extern 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
312extern void pagebuf_pin( /* pin buffer in memory */
313 xfs_buf_t *); /* buffer to pin */
314
315extern void pagebuf_unpin( /* unpin buffered data */
316 xfs_buf_t *); /* buffer to unpin */
317
318extern int pagebuf_ispin( /* check if buffer is pinned */
319 xfs_buf_t *); /* buffer to check */
320
321/* Delayed Write Buffer Routines */
322
323extern void pagebuf_delwri_dequeue(xfs_buf_t *);
324
325/* Buffer Daemon Setup Routines */
326
327extern int pagebuf_init(void);
328extern void pagebuf_terminate(void);
329
330
331#ifdef PAGEBUF_TRACE
332extern ktrace_t *pagebuf_trace_buf;
333extern 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
455extern 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
499static 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
507static 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
531static 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
551static 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
575extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
576extern void xfs_free_buftarg(xfs_buftarg_t *, int);
577extern void xfs_wait_buftarg(xfs_buftarg_t *);
578extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
579extern void xfs_incore_relse(xfs_buftarg_t *, int, int);
580extern 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__ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-09 16:05:46 -0500