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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 */
Dave Chinner2ee1aba2009-11-24 18:03:15 +000058 XBF_LOG_BUFFER = (1 << 13), /* this is a buffer used for the log */
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 /* flags used only as arguments to access routines */
Nathan Scottce8e9222006-01-11 15:39:08 +110061 XBF_LOCK = (1 << 14), /* lock requested */
62 XBF_TRYLOCK = (1 << 15), /* lock requested, but do not wait */
63 XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread */
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 /* flags used only internally */
Nathan Scottce8e9222006-01-11 15:39:08 +110066 _XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache */
Christoph Hellwig1fa40b02007-05-14 18:23:50 +100067 _XBF_PAGES = (1 << 18), /* backed by refcounted pages */
Nathan Scottce8e9222006-01-11 15:39:08 +110068 _XBF_RUN_QUEUES = (1 << 19),/* run block device task queue */
69 _XBF_DELWRI_Q = (1 << 21), /* buffer on delwri queue */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100070
71 /*
72 * Special flag for supporting metadata blocks smaller than a FSB.
73 *
74 * In this case we can have multiple xfs_buf_t on a single page and
75 * need to lock out concurrent xfs_buf_t readers as they only
76 * serialise access to the buffer.
77 *
78 * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
79 * between reads of the page. Hence we can have one thread read the
80 * page and modify it, but then race with another thread that thinks
81 * the page is not up-to-date and hence reads it again.
82 *
83 * The result is that the first modifcation to the page is lost.
84 * This sort of AGF/AGI reading race can happen when unlinking inodes
85 * that require truncation and results in the AGI unlinked list
86 * modifications being lost.
87 */
88 _XBF_PAGE_LOCKED = (1 << 22),
Christoph Hellwig73f6aa42008-10-10 17:28:29 +110089
90 /*
91 * If we try a barrier write, but it fails we have to communicate
92 * this to the upper layers. Unfortunately b_error gets overwritten
93 * when the buffer is re-issued so we have to add another flag to
94 * keep this information.
95 */
96 _XFS_BARRIER_FAILED = (1 << 23),
Nathan Scottce8e9222006-01-11 15:39:08 +110097} xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000099#define XFS_BUF_FLAGS \
100 { XBF_READ, "READ" }, \
101 { XBF_WRITE, "WRITE" }, \
102 { XBF_MAPPED, "MAPPED" }, \
103 { XBF_ASYNC, "ASYNC" }, \
104 { XBF_DONE, "DONE" }, \
105 { XBF_DELWRI, "DELWRI" }, \
106 { XBF_STALE, "STALE" }, \
107 { XBF_FS_MANAGED, "FS_MANAGED" }, \
108 { XBF_ORDERED, "ORDERED" }, \
109 { XBF_READ_AHEAD, "READ_AHEAD" }, \
110 { XBF_LOCK, "LOCK" }, /* should never be set */\
111 { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\
112 { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\
113 { _XBF_PAGE_CACHE, "PAGE_CACHE" }, \
114 { _XBF_PAGES, "PAGES" }, \
115 { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
116 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
117 { _XBF_PAGE_LOCKED, "PAGE_LOCKED" }, \
118 { _XFS_BARRIER_FAILED, "BARRIER_FAILED" }
119
120
Nathan Scottce8e9222006-01-11 15:39:08 +1100121typedef enum {
David Chinner5e6a07d2007-02-10 18:34:49 +1100122 XBT_FORCE_SLEEP = 0,
123 XBT_FORCE_FLUSH = 1,
Nathan Scottce8e9222006-01-11 15:39:08 +1100124} xfs_buftarg_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126typedef struct xfs_bufhash {
127 struct list_head bh_list;
128 spinlock_t bh_lock;
129} xfs_bufhash_t;
130
131typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +1100132 dev_t bt_dev;
133 struct block_device *bt_bdev;
134 struct address_space *bt_mapping;
135 unsigned int bt_bsize;
136 unsigned int bt_sshift;
137 size_t bt_smask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Nathan Scottce8e9222006-01-11 15:39:08 +1100139 /* per device buffer hash table */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 uint bt_hashmask;
141 uint bt_hashshift;
142 xfs_bufhash_t *bt_hash;
David Chinnera6867a62006-01-11 15:37:58 +1100143
144 /* per device delwri queue */
145 struct task_struct *bt_task;
146 struct list_head bt_list;
147 struct list_head bt_delwrite_queue;
148 spinlock_t bt_delwrite_lock;
Nathan Scottce8e9222006-01-11 15:39:08 +1100149 unsigned long bt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150} xfs_buftarg_t;
151
152/*
Nathan Scottce8e9222006-01-11 15:39:08 +1100153 * xfs_buf_t: Buffer structure for pagecache-based buffers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 *
Nathan Scottce8e9222006-01-11 15:39:08 +1100155 * This buffer structure is used by the pagecache buffer management routines
156 * to refer to an assembly of pages forming a logical buffer.
157 *
158 * The buffer structure is used on a temporary basis only, and discarded when
159 * released. The real data storage is recorded in the pagecache. Buffers are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 * hashed to the block device on which the file system resides.
161 */
162
163struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100164typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
165typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
166typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Nathan Scottce8e9222006-01-11 15:39:08 +1100168#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170typedef struct xfs_buf {
Nathan Scottce8e9222006-01-11 15:39:08 +1100171 struct semaphore b_sema; /* semaphore for lockables */
172 unsigned long b_queuetime; /* time buffer was queued */
173 atomic_t b_pin_count; /* pin count */
174 wait_queue_head_t b_waiters; /* unpin waiters */
175 struct list_head b_list;
176 xfs_buf_flags_t b_flags; /* status flags */
177 struct list_head b_hash_list; /* hash table list */
178 xfs_bufhash_t *b_hash; /* hash table list start */
179 xfs_buftarg_t *b_target; /* buffer target (device) */
180 atomic_t b_hold; /* reference count */
181 xfs_daddr_t b_bn; /* block number for I/O */
182 xfs_off_t b_file_offset; /* offset in file */
183 size_t b_buffer_length;/* size of buffer in bytes */
184 size_t b_count_desired;/* desired transfer size */
185 void *b_addr; /* virtual address of buffer */
186 struct work_struct b_iodone_work;
187 atomic_t b_io_remaining; /* #outstanding I/O requests */
188 xfs_buf_iodone_t b_iodone; /* I/O completion function */
189 xfs_buf_relse_t b_relse; /* releasing function */
190 xfs_buf_bdstrat_t b_strat; /* pre-write function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000191 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100192 void *b_fspriv;
193 void *b_fspriv2;
Christoph Hellwig15ac08a2008-12-09 04:47:30 -0500194 struct xfs_mount *b_mount;
Nathan Scottce8e9222006-01-11 15:39:08 +1100195 unsigned short b_error; /* error code on I/O */
Nathan Scottce8e9222006-01-11 15:39:08 +1100196 unsigned int b_page_count; /* size of page array */
197 unsigned int b_offset; /* page offset in first page */
198 struct page **b_pages; /* array of page pointers */
199 struct page *b_page_array[XB_PAGES]; /* inline pages */
200#ifdef XFS_BUF_LOCK_TRACKING
201 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202#endif
203} xfs_buf_t;
204
205
206/* Finding and Reading Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100207extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
208 xfs_buf_flags_t, xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209#define xfs_incore(buftarg,blkno,len,lockit) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100210 _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Christoph Hellwig6ad112b2009-11-24 18:02:23 +0000212extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t,
Nathan Scottce8e9222006-01-11 15:39:08 +1100213 xfs_buf_flags_t);
Christoph Hellwig6ad112b2009-11-24 18:02:23 +0000214extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
Nathan Scottce8e9222006-01-11 15:39:08 +1100215 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Nathan Scottce8e9222006-01-11 15:39:08 +1100217extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
218extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
219extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
220extern void xfs_buf_hold(xfs_buf_t *);
221extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
222 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100225extern void xfs_buf_free(xfs_buf_t *);
226extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228/* Locking and Unlocking Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100229extern int xfs_buf_cond_lock(xfs_buf_t *);
230extern int xfs_buf_lock_value(xfs_buf_t *);
231extern void xfs_buf_lock(xfs_buf_t *);
232extern void xfs_buf_unlock(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234/* Buffer Read and Write Routines */
Christoph Hellwig5d765b92008-12-03 12:20:26 +0100235extern int xfs_bawrite(void *mp, xfs_buf_t *bp);
236extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100237extern void xfs_buf_ioend(xfs_buf_t *, int);
238extern void xfs_buf_ioerror(xfs_buf_t *, int);
Nathan Scottce8e9222006-01-11 15:39:08 +1100239extern int xfs_buf_iorequest(xfs_buf_t *);
240extern int xfs_buf_iowait(xfs_buf_t *);
241extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
242 xfs_buf_rw_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Nathan Scottce8e9222006-01-11 15:39:08 +1100244static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
Nathan Scottce8e9222006-01-11 15:39:08 +1100246 return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Nathan Scottce8e9222006-01-11 15:39:08 +1100249static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Nathan Scottce8e9222006-01-11 15:39:08 +1100251 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
254/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100255extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257/* Pinning Buffer Storage in Memory */
Nathan Scottce8e9222006-01-11 15:39:08 +1100258extern void xfs_buf_pin(xfs_buf_t *);
259extern void xfs_buf_unpin(xfs_buf_t *);
260extern int xfs_buf_ispin(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262/* Delayed Write Buffer Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100263extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100266extern int xfs_buf_init(void);
267extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Nathan Scottce8e9222006-01-11 15:39:08 +1100269#define xfs_buf_target_name(target) \
270 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272
Nathan Scottce8e9222006-01-11 15:39:08 +1100273#define XFS_B_ASYNC XBF_ASYNC
274#define XFS_B_DELWRI XBF_DELWRI
275#define XFS_B_READ XBF_READ
276#define XFS_B_WRITE XBF_WRITE
277#define XFS_B_STALE XBF_STALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Nathan Scottce8e9222006-01-11 15:39:08 +1100279#define XFS_BUF_TRYLOCK XBF_TRYLOCK
280#define XFS_INCORE_TRYLOCK XBF_TRYLOCK
281#define XFS_BUF_LOCK XBF_LOCK
282#define XFS_BUF_MAPPED XBF_MAPPED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Nathan Scottce8e9222006-01-11 15:39:08 +1100284#define BUF_BUSY XBF_DONT_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Nathan Scottce8e9222006-01-11 15:39:08 +1100286#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
Nathan Scottf5faad72006-07-28 17:04:44 +1000287#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
288 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Nathan Scottce8e9222006-01-11 15:39:08 +1100290#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XFS_B_STALE)
291#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XFS_B_STALE)
292#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XFS_B_STALE)
293#define XFS_BUF_SUPER_STALE(bp) do { \
294 XFS_BUF_STALE(bp); \
295 xfs_buf_delwri_dequeue(bp); \
296 XFS_BUF_DONE(bp); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 } while (0)
298
Nathan Scottce8e9222006-01-11 15:39:08 +1100299#define XFS_BUF_MANAGE XBF_FS_MANAGED
300#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Nathan Scottce8e9222006-01-11 15:39:08 +1100302#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
303#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
304#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Nathan Scottce8e9222006-01-11 15:39:08 +1100306#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
307#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
308#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Nathan Scottce8e9222006-01-11 15:39:08 +1100310#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
311#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
312#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Nathan Scottce8e9222006-01-11 15:39:08 +1100314#define XFS_BUF_BUSY(bp) do { } while (0)
315#define XFS_BUF_UNBUSY(bp) do { } while (0)
316#define XFS_BUF_ISBUSY(bp) (1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Nathan Scottce8e9222006-01-11 15:39:08 +1100318#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
319#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
320#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Nathan Scottce8e9222006-01-11 15:39:08 +1100322#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
323#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
324#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Nathan Scottce8e9222006-01-11 15:39:08 +1100326#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
327#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
328#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
329#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Nathan Scottce8e9222006-01-11 15:39:08 +1100331#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
332#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
333#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Nathan Scottce8e9222006-01-11 15:39:08 +1100335#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
336#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
337#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
338#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func))
339#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Nathan Scottce8e9222006-01-11 15:39:08 +1100341#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
342#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
343#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
344#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
Nathan Scottce8e9222006-01-11 15:39:08 +1100345#define XFS_BUF_SET_START(bp) do { } while (0)
346#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Nathan Scottce8e9222006-01-11 15:39:08 +1100348#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
349#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
350#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
351#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
352#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
353#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
354#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
355#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
356#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
357#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Nathan Scottce8e9222006-01-11 15:39:08 +1100359#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
360#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
361#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Nathan Scottce8e9222006-01-11 15:39:08 +1100363#define XFS_BUF_ISPINNED(bp) xfs_buf_ispin(bp)
364
365#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
366#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
367#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
368#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
David Chinnerb4dd3302008-08-13 16:36:11 +1000369#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
Nathan Scottce8e9222006-01-11 15:39:08 +1100370
371#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
372#define XFS_BUF_TARGET(bp) ((bp)->b_target)
373#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
374
Nathan Scottce8e9222006-01-11 15:39:08 +1100375static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
Nathan Scottce8e9222006-01-11 15:39:08 +1100377 if (!bp->b_relse)
378 xfs_buf_unlock(bp);
379 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
Nathan Scottce8e9222006-01-11 15:39:08 +1100382#define xfs_bpin(bp) xfs_buf_pin(bp)
383#define xfs_bunpin(bp) xfs_buf_unpin(bp)
Nathan Scottce8e9222006-01-11 15:39:08 +1100384#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Nathan Scottce8e9222006-01-11 15:39:08 +1100386#define xfs_biomove(bp, off, len, data, rw) \
387 xfs_buf_iomove((bp), (off), (len), (data), \
388 ((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Nathan Scottce8e9222006-01-11 15:39:08 +1100390#define xfs_biozero(bp, off, len) \
391 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393
Nathan Scottce8e9222006-01-11 15:39:08 +1100394static inline int XFS_bwrite(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
Nathan Scottce8e9222006-01-11 15:39:08 +1100396 int iowait = (bp->b_flags & XBF_ASYNC) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 int error = 0;
398
399 if (!iowait)
Nathan Scottce8e9222006-01-11 15:39:08 +1100400 bp->b_flags |= _XBF_RUN_QUEUES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Nathan Scottce8e9222006-01-11 15:39:08 +1100402 xfs_buf_delwri_dequeue(bp);
403 xfs_buf_iostrategy(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 if (iowait) {
Nathan Scottce8e9222006-01-11 15:39:08 +1100405 error = xfs_buf_iowait(bp);
406 xfs_buf_relse(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408 return error;
409}
410
Nathan Scottce8e9222006-01-11 15:39:08 +1100411#define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Nathan Scottce8e9222006-01-11 15:39:08 +1100413#define xfs_iowait(bp) xfs_buf_iowait(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
415#define xfs_baread(target, rablkno, ralen) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100416 xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418
419/*
420 * Handling of buftargs.
421 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500423extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424extern void xfs_wait_buftarg(xfs_buftarg_t *);
425extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
Tim Shimmine6a0e9c2007-05-08 13:49:59 +1000427#ifdef CONFIG_KDB_MODULES
428extern struct list_head *xfs_get_buftarg_list(void);
429#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Nathan Scottce8e9222006-01-11 15:39:08 +1100431#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
432#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
433
434#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
435#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437#endif /* __XFS_BUF_H__ */