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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#ifndef __XFS_BUF_H__
19#define __XFS_BUF_H__
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/list.h>
22#include <linux/types.h>
23#include <linux/spinlock.h>
24#include <asm/system.h>
25#include <linux/mm.h>
26#include <linux/fs.h>
27#include <linux/buffer_head.h>
28#include <linux/uio.h>
29
30/*
31 * Base types
32 */
33
Nathan Scottce8e9222006-01-11 15:39:08 +110034#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Nathan Scottce8e9222006-01-11 15:39:08 +110036#define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE)
37#define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT)
38#define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT)
39#define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Nathan Scottce8e9222006-01-11 15:39:08 +110041typedef enum {
42 XBRW_READ = 1, /* transfer into target memory */
43 XBRW_WRITE = 2, /* transfer from target memory */
44 XBRW_ZERO = 3, /* Zero target memory */
45} xfs_buf_rw_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Nathan Scottce8e9222006-01-11 15:39:08 +110047typedef enum {
48 XBF_READ = (1 << 0), /* buffer intended for reading from device */
49 XBF_WRITE = (1 << 1), /* buffer intended for writing to device */
50 XBF_MAPPED = (1 << 2), /* buffer mapped (b_addr valid) */
51 XBF_ASYNC = (1 << 4), /* initiator will not wait for completion */
52 XBF_DONE = (1 << 5), /* all pages in the buffer uptodate */
53 XBF_DELWRI = (1 << 6), /* buffer has dirty pages */
54 XBF_STALE = (1 << 7), /* buffer has been staled, do not find it */
55 XBF_FS_MANAGED = (1 << 8), /* filesystem controls freeing memory */
56 XBF_ORDERED = (1 << 11), /* use ordered writes */
57 XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 /* flags used only as arguments to access routines */
Nathan Scottce8e9222006-01-11 15:39:08 +110060 XBF_LOCK = (1 << 14), /* lock requested */
61 XBF_TRYLOCK = (1 << 15), /* lock requested, but do not wait */
62 XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 /* flags used only internally */
Nathan Scottce8e9222006-01-11 15:39:08 +110065 _XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache */
Christoph Hellwig1fa40b02007-05-14 18:23:50 +100066 _XBF_PAGES = (1 << 18), /* backed by refcounted pages */
Nathan Scottce8e9222006-01-11 15:39:08 +110067 _XBF_RUN_QUEUES = (1 << 19),/* run block device task queue */
68 _XBF_DELWRI_Q = (1 << 21), /* buffer on delwri queue */
69} xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Nathan Scottce8e9222006-01-11 15:39:08 +110071typedef enum {
David Chinner5e6a07d2007-02-10 18:34:49 +110072 XBT_FORCE_SLEEP = 0,
73 XBT_FORCE_FLUSH = 1,
Nathan Scottce8e9222006-01-11 15:39:08 +110074} xfs_buftarg_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76typedef struct xfs_bufhash {
77 struct list_head bh_list;
78 spinlock_t bh_lock;
79} xfs_bufhash_t;
80
81typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +110082 dev_t bt_dev;
83 struct block_device *bt_bdev;
84 struct address_space *bt_mapping;
85 unsigned int bt_bsize;
86 unsigned int bt_sshift;
87 size_t bt_smask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Nathan Scottce8e9222006-01-11 15:39:08 +110089 /* per device buffer hash table */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 uint bt_hashmask;
91 uint bt_hashshift;
92 xfs_bufhash_t *bt_hash;
David Chinnera6867a62006-01-11 15:37:58 +110093
94 /* per device delwri queue */
95 struct task_struct *bt_task;
96 struct list_head bt_list;
97 struct list_head bt_delwrite_queue;
98 spinlock_t bt_delwrite_lock;
Nathan Scottce8e9222006-01-11 15:39:08 +110099 unsigned long bt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100} xfs_buftarg_t;
101
102/*
Nathan Scottce8e9222006-01-11 15:39:08 +1100103 * xfs_buf_t: Buffer structure for pagecache-based buffers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 *
Nathan Scottce8e9222006-01-11 15:39:08 +1100105 * This buffer structure is used by the pagecache buffer management routines
106 * to refer to an assembly of pages forming a logical buffer.
107 *
108 * The buffer structure is used on a temporary basis only, and discarded when
109 * released. The real data storage is recorded in the pagecache. Buffers are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 * hashed to the block device on which the file system resides.
111 */
112
113struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100114typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
115typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
116typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Nathan Scottce8e9222006-01-11 15:39:08 +1100118#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120typedef struct xfs_buf {
Nathan Scottce8e9222006-01-11 15:39:08 +1100121 struct semaphore b_sema; /* semaphore for lockables */
122 unsigned long b_queuetime; /* time buffer was queued */
123 atomic_t b_pin_count; /* pin count */
124 wait_queue_head_t b_waiters; /* unpin waiters */
125 struct list_head b_list;
126 xfs_buf_flags_t b_flags; /* status flags */
127 struct list_head b_hash_list; /* hash table list */
128 xfs_bufhash_t *b_hash; /* hash table list start */
129 xfs_buftarg_t *b_target; /* buffer target (device) */
130 atomic_t b_hold; /* reference count */
131 xfs_daddr_t b_bn; /* block number for I/O */
132 xfs_off_t b_file_offset; /* offset in file */
133 size_t b_buffer_length;/* size of buffer in bytes */
134 size_t b_count_desired;/* desired transfer size */
135 void *b_addr; /* virtual address of buffer */
136 struct work_struct b_iodone_work;
137 atomic_t b_io_remaining; /* #outstanding I/O requests */
138 xfs_buf_iodone_t b_iodone; /* I/O completion function */
139 xfs_buf_relse_t b_relse; /* releasing function */
140 xfs_buf_bdstrat_t b_strat; /* pre-write function */
141 struct semaphore b_iodonesema; /* Semaphore for I/O waiters */
142 void *b_fspriv;
143 void *b_fspriv2;
144 void *b_fspriv3;
145 unsigned short b_error; /* error code on I/O */
146 unsigned short b_locked; /* page array is locked */
147 unsigned int b_page_count; /* size of page array */
148 unsigned int b_offset; /* page offset in first page */
149 struct page **b_pages; /* array of page pointers */
150 struct page *b_page_array[XB_PAGES]; /* inline pages */
151#ifdef XFS_BUF_LOCK_TRACKING
152 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#endif
154} xfs_buf_t;
155
156
157/* Finding and Reading Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100158extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
159 xfs_buf_flags_t, xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160#define xfs_incore(buftarg,blkno,len,lockit) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100161 _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Nathan Scottce8e9222006-01-11 15:39:08 +1100163extern xfs_buf_t *xfs_buf_get_flags(xfs_buftarg_t *, xfs_off_t, size_t,
164 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165#define xfs_buf_get(target, blkno, len, flags) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100166 xfs_buf_get_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Nathan Scottce8e9222006-01-11 15:39:08 +1100168extern xfs_buf_t *xfs_buf_read_flags(xfs_buftarg_t *, xfs_off_t, size_t,
169 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170#define xfs_buf_read(target, blkno, len, flags) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100171 xfs_buf_read_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Nathan Scottce8e9222006-01-11 15:39:08 +1100173extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
174extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
175extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
176extern void xfs_buf_hold(xfs_buf_t *);
177extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
178 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100181extern void xfs_buf_free(xfs_buf_t *);
182extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184/* Locking and Unlocking Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100185extern int xfs_buf_cond_lock(xfs_buf_t *);
186extern int xfs_buf_lock_value(xfs_buf_t *);
187extern void xfs_buf_lock(xfs_buf_t *);
188extern void xfs_buf_unlock(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190/* Buffer Read and Write Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100191extern void xfs_buf_ioend(xfs_buf_t *, int);
192extern void xfs_buf_ioerror(xfs_buf_t *, int);
193extern int xfs_buf_iostart(xfs_buf_t *, xfs_buf_flags_t);
194extern int xfs_buf_iorequest(xfs_buf_t *);
195extern int xfs_buf_iowait(xfs_buf_t *);
196extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
197 xfs_buf_rw_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Nathan Scottce8e9222006-01-11 15:39:08 +1100199static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
Nathan Scottce8e9222006-01-11 15:39:08 +1100201 return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Nathan Scottce8e9222006-01-11 15:39:08 +1100204static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Nathan Scottce8e9222006-01-11 15:39:08 +1100206 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
209/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100210extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212/* Pinning Buffer Storage in Memory */
Nathan Scottce8e9222006-01-11 15:39:08 +1100213extern void xfs_buf_pin(xfs_buf_t *);
214extern void xfs_buf_unpin(xfs_buf_t *);
215extern int xfs_buf_ispin(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217/* Delayed Write Buffer Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100218extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100221extern int xfs_buf_init(void);
222extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Nathan Scottce8e9222006-01-11 15:39:08 +1100224#ifdef XFS_BUF_TRACE
225extern ktrace_t *xfs_buf_trace_buf;
226extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227#else
Nathan Scottce8e9222006-01-11 15:39:08 +1100228#define xfs_buf_trace(bp,id,ptr,ra) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229#endif
230
Nathan Scottce8e9222006-01-11 15:39:08 +1100231#define xfs_buf_target_name(target) \
232 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234
Nathan Scottce8e9222006-01-11 15:39:08 +1100235#define XFS_B_ASYNC XBF_ASYNC
236#define XFS_B_DELWRI XBF_DELWRI
237#define XFS_B_READ XBF_READ
238#define XFS_B_WRITE XBF_WRITE
239#define XFS_B_STALE XBF_STALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
Nathan Scottce8e9222006-01-11 15:39:08 +1100241#define XFS_BUF_TRYLOCK XBF_TRYLOCK
242#define XFS_INCORE_TRYLOCK XBF_TRYLOCK
243#define XFS_BUF_LOCK XBF_LOCK
244#define XFS_BUF_MAPPED XBF_MAPPED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Nathan Scottce8e9222006-01-11 15:39:08 +1100246#define BUF_BUSY XBF_DONT_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Nathan Scottce8e9222006-01-11 15:39:08 +1100248#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
Nathan Scottf5faad72006-07-28 17:04:44 +1000249#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
250 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Nathan Scottce8e9222006-01-11 15:39:08 +1100252#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XFS_B_STALE)
253#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XFS_B_STALE)
254#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XFS_B_STALE)
255#define XFS_BUF_SUPER_STALE(bp) do { \
256 XFS_BUF_STALE(bp); \
257 xfs_buf_delwri_dequeue(bp); \
258 XFS_BUF_DONE(bp); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 } while (0)
260
Nathan Scottce8e9222006-01-11 15:39:08 +1100261#define XFS_BUF_MANAGE XBF_FS_MANAGED
262#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Nathan Scottce8e9222006-01-11 15:39:08 +1100264#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
265#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
266#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Nathan Scottce8e9222006-01-11 15:39:08 +1100268#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
269#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
270#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Nathan Scottce8e9222006-01-11 15:39:08 +1100272#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
273#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
274#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Nathan Scottce8e9222006-01-11 15:39:08 +1100276#define XFS_BUF_BUSY(bp) do { } while (0)
277#define XFS_BUF_UNBUSY(bp) do { } while (0)
278#define XFS_BUF_ISBUSY(bp) (1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Nathan Scottce8e9222006-01-11 15:39:08 +1100280#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
281#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
282#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Nathan Scottce8e9222006-01-11 15:39:08 +1100284#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
285#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
286#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Nathan Scottce8e9222006-01-11 15:39:08 +1100288#define XFS_BUF_SHUT(bp) do { } while (0)
289#define XFS_BUF_UNSHUT(bp) do { } while (0)
290#define XFS_BUF_ISSHUT(bp) (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Nathan Scottce8e9222006-01-11 15:39:08 +1100292#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
293#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
294#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
295#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Nathan Scottce8e9222006-01-11 15:39:08 +1100297#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
298#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
299#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Nathan Scottce8e9222006-01-11 15:39:08 +1100301#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
302#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
303#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
304#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func))
305#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Nathan Scottce8e9222006-01-11 15:39:08 +1100307#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
308#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
309#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
310#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
311#define XFS_BUF_FSPRIVATE3(bp, type) ((type)(bp)->b_fspriv3)
312#define XFS_BUF_SET_FSPRIVATE3(bp, val) ((bp)->b_fspriv3 = (void*)(val))
313#define XFS_BUF_SET_START(bp) do { } while (0)
314#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Nathan Scottce8e9222006-01-11 15:39:08 +1100316#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
317#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
318#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
319#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
320#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
321#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
322#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
323#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
324#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
325#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Nathan Scottce8e9222006-01-11 15:39:08 +1100327#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
328#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
329#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Nathan Scottce8e9222006-01-11 15:39:08 +1100331#define XFS_BUF_ISPINNED(bp) xfs_buf_ispin(bp)
332
333#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
334#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
335#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
336#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
337#define XFS_BUF_V_IODONESEMA(bp) up(&bp->b_iodonesema);
338
339#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
340#define XFS_BUF_TARGET(bp) ((bp)->b_target)
341#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
342
343static inline int xfs_bawrite(void *mp, xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
Nathan Scottce8e9222006-01-11 15:39:08 +1100345 bp->b_fspriv3 = mp;
346 bp->b_strat = xfs_bdstrat_cb;
347 xfs_buf_delwri_dequeue(bp);
348 return xfs_buf_iostart(bp, XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
Nathan Scottce8e9222006-01-11 15:39:08 +1100351static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Nathan Scottce8e9222006-01-11 15:39:08 +1100353 if (!bp->b_relse)
354 xfs_buf_unlock(bp);
355 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
Nathan Scottce8e9222006-01-11 15:39:08 +1100358#define xfs_bpin(bp) xfs_buf_pin(bp)
359#define xfs_bunpin(bp) xfs_buf_unpin(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361#define xfs_buftrace(id, bp) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100362 xfs_buf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Nathan Scottce8e9222006-01-11 15:39:08 +1100364#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Nathan Scottce8e9222006-01-11 15:39:08 +1100366#define xfs_biomove(bp, off, len, data, rw) \
367 xfs_buf_iomove((bp), (off), (len), (data), \
368 ((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Nathan Scottce8e9222006-01-11 15:39:08 +1100370#define xfs_biozero(bp, off, len) \
371 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373
Nathan Scottce8e9222006-01-11 15:39:08 +1100374static inline int XFS_bwrite(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Nathan Scottce8e9222006-01-11 15:39:08 +1100376 int iowait = (bp->b_flags & XBF_ASYNC) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 int error = 0;
378
379 if (!iowait)
Nathan Scottce8e9222006-01-11 15:39:08 +1100380 bp->b_flags |= _XBF_RUN_QUEUES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Nathan Scottce8e9222006-01-11 15:39:08 +1100382 xfs_buf_delwri_dequeue(bp);
383 xfs_buf_iostrategy(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (iowait) {
Nathan Scottce8e9222006-01-11 15:39:08 +1100385 error = xfs_buf_iowait(bp);
386 xfs_buf_relse(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388 return error;
389}
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
392{
Nathan Scottce8e9222006-01-11 15:39:08 +1100393 bp->b_strat = xfs_bdstrat_cb;
394 bp->b_fspriv3 = mp;
395 return xfs_buf_iostart(bp, XBF_DELWRI | XBF_ASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
397
Nathan Scottce8e9222006-01-11 15:39:08 +1100398#define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Nathan Scottce8e9222006-01-11 15:39:08 +1100400#define xfs_iowait(bp) xfs_buf_iowait(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402#define xfs_baread(target, rablkno, ralen) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100403 xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405
406/*
407 * Handling of buftargs.
408 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
410extern void xfs_free_buftarg(xfs_buftarg_t *, int);
411extern void xfs_wait_buftarg(xfs_buftarg_t *);
412extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
Tim Shimmine6a0e9c2007-05-08 13:49:59 +1000414#ifdef CONFIG_KDB_MODULES
415extern struct list_head *xfs_get_buftarg_list(void);
416#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Nathan Scottce8e9222006-01-11 15:39:08 +1100418#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
419#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
420
421#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
422#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424#endif /* __XFS_BUF_H__ */