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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 */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100069
70 /*
71 * Special flag for supporting metadata blocks smaller than a FSB.
72 *
73 * In this case we can have multiple xfs_buf_t on a single page and
74 * need to lock out concurrent xfs_buf_t readers as they only
75 * serialise access to the buffer.
76 *
77 * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
78 * between reads of the page. Hence we can have one thread read the
79 * page and modify it, but then race with another thread that thinks
80 * the page is not up-to-date and hence reads it again.
81 *
82 * The result is that the first modifcation to the page is lost.
83 * This sort of AGF/AGI reading race can happen when unlinking inodes
84 * that require truncation and results in the AGI unlinked list
85 * modifications being lost.
86 */
87 _XBF_PAGE_LOCKED = (1 << 22),
Christoph Hellwig73f6aa42008-10-10 17:28:29 +110088
89 /*
90 * If we try a barrier write, but it fails we have to communicate
91 * this to the upper layers. Unfortunately b_error gets overwritten
92 * when the buffer is re-issued so we have to add another flag to
93 * keep this information.
94 */
95 _XFS_BARRIER_FAILED = (1 << 23),
Nathan Scottce8e9222006-01-11 15:39:08 +110096} xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Nathan Scottce8e9222006-01-11 15:39:08 +110098typedef enum {
David Chinner5e6a07d2007-02-10 18:34:49 +110099 XBT_FORCE_SLEEP = 0,
100 XBT_FORCE_FLUSH = 1,
Nathan Scottce8e9222006-01-11 15:39:08 +1100101} xfs_buftarg_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103typedef struct xfs_bufhash {
104 struct list_head bh_list;
105 spinlock_t bh_lock;
106} xfs_bufhash_t;
107
108typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +1100109 dev_t bt_dev;
110 struct block_device *bt_bdev;
111 struct address_space *bt_mapping;
112 unsigned int bt_bsize;
113 unsigned int bt_sshift;
114 size_t bt_smask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Nathan Scottce8e9222006-01-11 15:39:08 +1100116 /* per device buffer hash table */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 uint bt_hashmask;
118 uint bt_hashshift;
119 xfs_bufhash_t *bt_hash;
David Chinnera6867a62006-01-11 15:37:58 +1100120
121 /* per device delwri queue */
122 struct task_struct *bt_task;
123 struct list_head bt_list;
124 struct list_head bt_delwrite_queue;
125 spinlock_t bt_delwrite_lock;
Nathan Scottce8e9222006-01-11 15:39:08 +1100126 unsigned long bt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127} xfs_buftarg_t;
128
129/*
Nathan Scottce8e9222006-01-11 15:39:08 +1100130 * xfs_buf_t: Buffer structure for pagecache-based buffers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 *
Nathan Scottce8e9222006-01-11 15:39:08 +1100132 * This buffer structure is used by the pagecache buffer management routines
133 * to refer to an assembly of pages forming a logical buffer.
134 *
135 * The buffer structure is used on a temporary basis only, and discarded when
136 * released. The real data storage is recorded in the pagecache. Buffers are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 * hashed to the block device on which the file system resides.
138 */
139
140struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100141typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
142typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
143typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Nathan Scottce8e9222006-01-11 15:39:08 +1100145#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147typedef struct xfs_buf {
Nathan Scottce8e9222006-01-11 15:39:08 +1100148 struct semaphore b_sema; /* semaphore for lockables */
149 unsigned long b_queuetime; /* time buffer was queued */
150 atomic_t b_pin_count; /* pin count */
151 wait_queue_head_t b_waiters; /* unpin waiters */
152 struct list_head b_list;
153 xfs_buf_flags_t b_flags; /* status flags */
154 struct list_head b_hash_list; /* hash table list */
155 xfs_bufhash_t *b_hash; /* hash table list start */
156 xfs_buftarg_t *b_target; /* buffer target (device) */
157 atomic_t b_hold; /* reference count */
158 xfs_daddr_t b_bn; /* block number for I/O */
159 xfs_off_t b_file_offset; /* offset in file */
160 size_t b_buffer_length;/* size of buffer in bytes */
161 size_t b_count_desired;/* desired transfer size */
162 void *b_addr; /* virtual address of buffer */
163 struct work_struct b_iodone_work;
164 atomic_t b_io_remaining; /* #outstanding I/O requests */
165 xfs_buf_iodone_t b_iodone; /* I/O completion function */
166 xfs_buf_relse_t b_relse; /* releasing function */
167 xfs_buf_bdstrat_t b_strat; /* pre-write function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000168 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100169 void *b_fspriv;
170 void *b_fspriv2;
Christoph Hellwig15ac08a2008-12-09 04:47:30 -0500171 struct xfs_mount *b_mount;
Nathan Scottce8e9222006-01-11 15:39:08 +1100172 unsigned short b_error; /* error code on I/O */
Nathan Scottce8e9222006-01-11 15:39:08 +1100173 unsigned int b_page_count; /* size of page array */
174 unsigned int b_offset; /* page offset in first page */
175 struct page **b_pages; /* array of page pointers */
176 struct page *b_page_array[XB_PAGES]; /* inline pages */
177#ifdef XFS_BUF_LOCK_TRACKING
178 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179#endif
180} xfs_buf_t;
181
182
183/* Finding and Reading Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100184extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
185 xfs_buf_flags_t, xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186#define xfs_incore(buftarg,blkno,len,lockit) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100187 _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Nathan Scottce8e9222006-01-11 15:39:08 +1100189extern xfs_buf_t *xfs_buf_get_flags(xfs_buftarg_t *, xfs_off_t, size_t,
190 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191#define xfs_buf_get(target, blkno, len, flags) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100192 xfs_buf_get_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Nathan Scottce8e9222006-01-11 15:39:08 +1100194extern xfs_buf_t *xfs_buf_read_flags(xfs_buftarg_t *, xfs_off_t, size_t,
195 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196#define xfs_buf_read(target, blkno, len, flags) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100197 xfs_buf_read_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Nathan Scottce8e9222006-01-11 15:39:08 +1100199extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
200extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
201extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
202extern void xfs_buf_hold(xfs_buf_t *);
203extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
204 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100207extern void xfs_buf_free(xfs_buf_t *);
208extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210/* Locking and Unlocking Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100211extern int xfs_buf_cond_lock(xfs_buf_t *);
212extern int xfs_buf_lock_value(xfs_buf_t *);
213extern void xfs_buf_lock(xfs_buf_t *);
214extern void xfs_buf_unlock(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216/* Buffer Read and Write Routines */
Christoph Hellwig5d765b92008-12-03 12:20:26 +0100217extern int xfs_bawrite(void *mp, xfs_buf_t *bp);
218extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100219extern void xfs_buf_ioend(xfs_buf_t *, int);
220extern void xfs_buf_ioerror(xfs_buf_t *, int);
Nathan Scottce8e9222006-01-11 15:39:08 +1100221extern int xfs_buf_iorequest(xfs_buf_t *);
222extern int xfs_buf_iowait(xfs_buf_t *);
223extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
224 xfs_buf_rw_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Nathan Scottce8e9222006-01-11 15:39:08 +1100226static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Nathan Scottce8e9222006-01-11 15:39:08 +1100228 return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
Nathan Scottce8e9222006-01-11 15:39:08 +1100231static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Nathan Scottce8e9222006-01-11 15:39:08 +1100233 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100237extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239/* Pinning Buffer Storage in Memory */
Nathan Scottce8e9222006-01-11 15:39:08 +1100240extern void xfs_buf_pin(xfs_buf_t *);
241extern void xfs_buf_unpin(xfs_buf_t *);
242extern int xfs_buf_ispin(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244/* Delayed Write Buffer Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100245extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100248extern int xfs_buf_init(void);
249extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Nathan Scottce8e9222006-01-11 15:39:08 +1100251#ifdef XFS_BUF_TRACE
252extern ktrace_t *xfs_buf_trace_buf;
253extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254#else
Nathan Scottce8e9222006-01-11 15:39:08 +1100255#define xfs_buf_trace(bp,id,ptr,ra) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256#endif
257
Nathan Scottce8e9222006-01-11 15:39:08 +1100258#define xfs_buf_target_name(target) \
259 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261
Nathan Scottce8e9222006-01-11 15:39:08 +1100262#define XFS_B_ASYNC XBF_ASYNC
263#define XFS_B_DELWRI XBF_DELWRI
264#define XFS_B_READ XBF_READ
265#define XFS_B_WRITE XBF_WRITE
266#define XFS_B_STALE XBF_STALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Nathan Scottce8e9222006-01-11 15:39:08 +1100268#define XFS_BUF_TRYLOCK XBF_TRYLOCK
269#define XFS_INCORE_TRYLOCK XBF_TRYLOCK
270#define XFS_BUF_LOCK XBF_LOCK
271#define XFS_BUF_MAPPED XBF_MAPPED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Nathan Scottce8e9222006-01-11 15:39:08 +1100273#define BUF_BUSY XBF_DONT_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Nathan Scottce8e9222006-01-11 15:39:08 +1100275#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
Nathan Scottf5faad72006-07-28 17:04:44 +1000276#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
277 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Nathan Scottce8e9222006-01-11 15:39:08 +1100279#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XFS_B_STALE)
280#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XFS_B_STALE)
281#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XFS_B_STALE)
282#define XFS_BUF_SUPER_STALE(bp) do { \
283 XFS_BUF_STALE(bp); \
284 xfs_buf_delwri_dequeue(bp); \
285 XFS_BUF_DONE(bp); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 } while (0)
287
Nathan Scottce8e9222006-01-11 15:39:08 +1100288#define XFS_BUF_MANAGE XBF_FS_MANAGED
289#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Nathan Scottce8e9222006-01-11 15:39:08 +1100291#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
292#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
293#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Nathan Scottce8e9222006-01-11 15:39:08 +1100295#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
296#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
297#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Nathan Scottce8e9222006-01-11 15:39:08 +1100299#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
300#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
301#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Nathan Scottce8e9222006-01-11 15:39:08 +1100303#define XFS_BUF_BUSY(bp) do { } while (0)
304#define XFS_BUF_UNBUSY(bp) do { } while (0)
305#define XFS_BUF_ISBUSY(bp) (1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Nathan Scottce8e9222006-01-11 15:39:08 +1100307#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
308#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
309#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Nathan Scottce8e9222006-01-11 15:39:08 +1100311#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
312#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
313#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Nathan Scottce8e9222006-01-11 15:39:08 +1100315#define XFS_BUF_SHUT(bp) do { } while (0)
316#define XFS_BUF_UNSHUT(bp) do { } while (0)
317#define XFS_BUF_ISSHUT(bp) (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Nathan Scottce8e9222006-01-11 15:39:08 +1100319#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
320#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
321#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
322#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Nathan Scottce8e9222006-01-11 15:39:08 +1100324#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
325#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
326#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Nathan Scottce8e9222006-01-11 15:39:08 +1100328#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
329#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
330#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
331#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func))
332#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Nathan Scottce8e9222006-01-11 15:39:08 +1100334#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
335#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
336#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
337#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
Nathan Scottce8e9222006-01-11 15:39:08 +1100338#define XFS_BUF_SET_START(bp) do { } while (0)
339#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Nathan Scottce8e9222006-01-11 15:39:08 +1100341#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
342#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
343#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
344#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
345#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
346#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
347#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
348#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
349#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
350#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Nathan Scottce8e9222006-01-11 15:39:08 +1100352#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
353#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
354#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Nathan Scottce8e9222006-01-11 15:39:08 +1100356#define XFS_BUF_ISPINNED(bp) xfs_buf_ispin(bp)
357
358#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
359#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
360#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
361#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
David Chinnerb4dd3302008-08-13 16:36:11 +1000362#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
Nathan Scottce8e9222006-01-11 15:39:08 +1100363
364#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
365#define XFS_BUF_TARGET(bp) ((bp)->b_target)
366#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
367
Nathan Scottce8e9222006-01-11 15:39:08 +1100368static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369{
Nathan Scottce8e9222006-01-11 15:39:08 +1100370 if (!bp->b_relse)
371 xfs_buf_unlock(bp);
372 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
374
Nathan Scottce8e9222006-01-11 15:39:08 +1100375#define xfs_bpin(bp) xfs_buf_pin(bp)
376#define xfs_bunpin(bp) xfs_buf_unpin(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378#define xfs_buftrace(id, bp) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100379 xfs_buf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Nathan Scottce8e9222006-01-11 15:39:08 +1100381#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Nathan Scottce8e9222006-01-11 15:39:08 +1100383#define xfs_biomove(bp, off, len, data, rw) \
384 xfs_buf_iomove((bp), (off), (len), (data), \
385 ((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Nathan Scottce8e9222006-01-11 15:39:08 +1100387#define xfs_biozero(bp, off, len) \
388 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390
Nathan Scottce8e9222006-01-11 15:39:08 +1100391static inline int XFS_bwrite(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Nathan Scottce8e9222006-01-11 15:39:08 +1100393 int iowait = (bp->b_flags & XBF_ASYNC) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 int error = 0;
395
396 if (!iowait)
Nathan Scottce8e9222006-01-11 15:39:08 +1100397 bp->b_flags |= _XBF_RUN_QUEUES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Nathan Scottce8e9222006-01-11 15:39:08 +1100399 xfs_buf_delwri_dequeue(bp);
400 xfs_buf_iostrategy(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (iowait) {
Nathan Scottce8e9222006-01-11 15:39:08 +1100402 error = xfs_buf_iowait(bp);
403 xfs_buf_relse(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 }
405 return error;
406}
407
Nathan Scottce8e9222006-01-11 15:39:08 +1100408#define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Nathan Scottce8e9222006-01-11 15:39:08 +1100410#define xfs_iowait(bp) xfs_buf_iowait(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412#define xfs_baread(target, rablkno, ralen) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100413 xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
415
416/*
417 * Handling of buftargs.
418 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
Christoph Hellwig19f354d2008-05-20 11:31:13 +1000420extern void xfs_free_buftarg(xfs_buftarg_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421extern void xfs_wait_buftarg(xfs_buftarg_t *);
422extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
Tim Shimmine6a0e9c2007-05-08 13:49:59 +1000424#ifdef CONFIG_KDB_MODULES
425extern struct list_head *xfs_get_buftarg_list(void);
426#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Nathan Scottce8e9222006-01-11 15:39:08 +1100428#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
429#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
430
431#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
432#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434#endif /* __XFS_BUF_H__ */