blob: 131c0ebf2c0da9f06efd797b99e5ce742a17c2a6 [file] [log] [blame]
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
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100047#define XBF_READ (1 << 0) /* buffer intended for reading from device */
48#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
49#define XBF_MAPPED (1 << 2) /* buffer mapped (b_addr valid) */
50#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
51#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
52#define XBF_DELWRI (1 << 6) /* buffer has dirty pages */
53#define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100054#define XBF_ORDERED (1 << 11)/* use ordered writes */
55#define XBF_READ_AHEAD (1 << 12)/* asynchronous read-ahead */
56#define XBF_LOG_BUFFER (1 << 13)/* this is a buffer used for the log */
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100058/* flags used only as arguments to access routines */
59#define XBF_LOCK (1 << 14)/* lock requested */
60#define XBF_TRYLOCK (1 << 15)/* lock requested, but do not wait */
61#define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100063/* flags used only internally */
64#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */
65#define _XBF_PAGES (1 << 18)/* backed by refcounted pages */
66#define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */
67#define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100068
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100069/*
70 * Special flag for supporting metadata blocks smaller than a FSB.
71 *
72 * In this case we can have multiple xfs_buf_t on a single page and
73 * need to lock out concurrent xfs_buf_t readers as they only
74 * serialise access to the buffer.
75 *
76 * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation
77 * between reads of the page. Hence we can have one thread read the
78 * page and modify it, but then race with another thread that thinks
79 * the page is not up-to-date and hence reads it again.
80 *
81 * The result is that the first modifcation to the page is lost.
82 * This sort of AGF/AGI reading race can happen when unlinking inodes
83 * that require truncation and results in the AGI unlinked list
84 * modifications being lost.
85 */
86#define _XBF_PAGE_LOCKED (1 << 22)
Christoph Hellwig73f6aa42008-10-10 17:28:29 +110087
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100088/*
89 * If we try a barrier write, but it fails we have to communicate
90 * this to the upper layers. Unfortunately b_error gets overwritten
91 * when the buffer is re-issued so we have to add another flag to
92 * keep this information.
93 */
94#define _XFS_BARRIER_FAILED (1 << 23)
95
96typedef unsigned int xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000098#define XFS_BUF_FLAGS \
99 { XBF_READ, "READ" }, \
100 { XBF_WRITE, "WRITE" }, \
101 { XBF_MAPPED, "MAPPED" }, \
102 { XBF_ASYNC, "ASYNC" }, \
103 { XBF_DONE, "DONE" }, \
104 { XBF_DELWRI, "DELWRI" }, \
105 { XBF_STALE, "STALE" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000106 { XBF_ORDERED, "ORDERED" }, \
107 { XBF_READ_AHEAD, "READ_AHEAD" }, \
108 { XBF_LOCK, "LOCK" }, /* should never be set */\
109 { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\
110 { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\
111 { _XBF_PAGE_CACHE, "PAGE_CACHE" }, \
112 { _XBF_PAGES, "PAGES" }, \
113 { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
114 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
115 { _XBF_PAGE_LOCKED, "PAGE_LOCKED" }, \
116 { _XFS_BARRIER_FAILED, "BARRIER_FAILED" }
117
118
Nathan Scottce8e9222006-01-11 15:39:08 +1100119typedef enum {
David Chinner5e6a07d2007-02-10 18:34:49 +1100120 XBT_FORCE_SLEEP = 0,
121 XBT_FORCE_FLUSH = 1,
Nathan Scottce8e9222006-01-11 15:39:08 +1100122} xfs_buftarg_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124typedef struct xfs_bufhash {
125 struct list_head bh_list;
126 spinlock_t bh_lock;
127} xfs_bufhash_t;
128
129typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +1100130 dev_t bt_dev;
131 struct block_device *bt_bdev;
132 struct address_space *bt_mapping;
Dave Chinnerebad8612010-09-22 10:47:20 +1000133 struct xfs_mount *bt_mount;
Nathan Scottce8e9222006-01-11 15:39:08 +1100134 unsigned int bt_bsize;
135 unsigned int bt_sshift;
136 size_t bt_smask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
David Chinnera6867a62006-01-11 15:37:58 +1100138 /* per device delwri queue */
139 struct task_struct *bt_task;
140 struct list_head bt_list;
141 struct list_head bt_delwrite_queue;
142 spinlock_t bt_delwrite_lock;
Nathan Scottce8e9222006-01-11 15:39:08 +1100143 unsigned long bt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144} xfs_buftarg_t;
145
146/*
Nathan Scottce8e9222006-01-11 15:39:08 +1100147 * xfs_buf_t: Buffer structure for pagecache-based buffers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 *
Nathan Scottce8e9222006-01-11 15:39:08 +1100149 * This buffer structure is used by the pagecache buffer management routines
150 * to refer to an assembly of pages forming a logical buffer.
151 *
152 * The buffer structure is used on a temporary basis only, and discarded when
153 * released. The real data storage is recorded in the pagecache. Buffers are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 * hashed to the block device on which the file system resides.
155 */
156
157struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100158typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
159typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
160typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Nathan Scottce8e9222006-01-11 15:39:08 +1100162#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
164typedef struct xfs_buf {
Dave Chinner50f59e82010-09-24 19:59:15 +1000165 /*
166 * first cacheline holds all the fields needed for an uncontended cache
167 * hit to be fully processed. The semaphore straddles the cacheline
168 * boundary, but the counter and lock sits on the first cacheline,
169 * which is the only bit that is touched if we hit the semaphore
170 * fast-path on locking.
171 */
Dave Chinner74f75a02010-09-24 19:59:04 +1000172 struct rb_node b_rbnode; /* rbtree node */
Nathan Scottce8e9222006-01-11 15:39:08 +1100173 xfs_off_t b_file_offset; /* offset in file */
174 size_t b_buffer_length;/* size of buffer in bytes */
Dave Chinner50f59e82010-09-24 19:59:15 +1000175 atomic_t b_hold; /* reference count */
176 xfs_buf_flags_t b_flags; /* status flags */
177 struct semaphore b_sema; /* semaphore for lockables */
178
179 wait_queue_head_t b_waiters; /* unpin waiters */
180 struct list_head b_list;
181 struct xfs_perag *b_pag; /* contains rbtree root */
182 xfs_buftarg_t *b_target; /* buffer target (device) */
183 xfs_daddr_t b_bn; /* block number for I/O */
Nathan Scottce8e9222006-01-11 15:39:08 +1100184 size_t b_count_desired;/* desired transfer size */
185 void *b_addr; /* virtual address of buffer */
186 struct work_struct b_iodone_work;
Nathan Scottce8e9222006-01-11 15:39:08 +1100187 xfs_buf_iodone_t b_iodone; /* I/O completion function */
188 xfs_buf_relse_t b_relse; /* releasing function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000189 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100190 void *b_fspriv;
191 void *b_fspriv2;
Nathan Scottce8e9222006-01-11 15:39:08 +1100192 struct page **b_pages; /* array of page pointers */
193 struct page *b_page_array[XB_PAGES]; /* inline pages */
Dave Chinner50f59e82010-09-24 19:59:15 +1000194 unsigned long b_queuetime; /* time buffer was queued */
195 atomic_t b_pin_count; /* pin count */
196 atomic_t b_io_remaining; /* #outstanding I/O requests */
197 unsigned int b_page_count; /* size of page array */
198 unsigned int b_offset; /* page offset in first page */
199 unsigned short b_error; /* error code on I/O */
Nathan Scottce8e9222006-01-11 15:39:08 +1100200#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 *);
Dave Chinner686865f2010-09-24 20:07:47 +1000218extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);
Nathan Scottce8e9222006-01-11 15:39:08 +1100219extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
220extern void xfs_buf_hold(xfs_buf_t *);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +0000221extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t);
Dave Chinner5adc94c2010-09-24 21:58:31 +1000222struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp,
223 struct xfs_buftarg *target,
224 xfs_daddr_t daddr, size_t length, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100227extern void xfs_buf_free(xfs_buf_t *);
228extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230/* Locking and Unlocking Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100231extern int xfs_buf_cond_lock(xfs_buf_t *);
232extern int xfs_buf_lock_value(xfs_buf_t *);
233extern void xfs_buf_lock(xfs_buf_t *);
234extern void xfs_buf_unlock(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236/* Buffer Read and Write Routines */
Christoph Hellwig64e0bc72010-01-13 22:17:58 +0000237extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
Christoph Hellwig5d765b92008-12-03 12:20:26 +0100238extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
Christoph Hellwig4e234712010-01-13 22:17:56 +0000239
240extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
241extern int xfs_bdstrat_cb(struct xfs_buf *);
242
Nathan Scottce8e9222006-01-11 15:39:08 +1100243extern void xfs_buf_ioend(xfs_buf_t *, int);
244extern void xfs_buf_ioerror(xfs_buf_t *, int);
Nathan Scottce8e9222006-01-11 15:39:08 +1100245extern int xfs_buf_iorequest(xfs_buf_t *);
246extern int xfs_buf_iowait(xfs_buf_t *);
Dave Chinnerb9c48642010-01-20 10:47:39 +1100247extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
Nathan Scottce8e9222006-01-11 15:39:08 +1100248 xfs_buf_rw_t);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +0000249#define xfs_buf_zero(bp, off, len) \
250 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Nathan Scottce8e9222006-01-11 15:39:08 +1100252static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Nathan Scottce8e9222006-01-11 15:39:08 +1100254 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
256
257/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100258extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260/* Delayed Write Buffer Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100261extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
Dave Chinnerd808f612010-02-02 10:13:42 +1100262extern void xfs_buf_delwri_promote(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100265extern int xfs_buf_init(void);
266extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Nathan Scottce8e9222006-01-11 15:39:08 +1100268#define xfs_buf_target_name(target) \
269 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271
Nathan Scottce8e9222006-01-11 15:39:08 +1100272#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
Nathan Scottf5faad72006-07-28 17:04:44 +1000273#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
274 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Christoph Hellwig0cadda12010-01-19 09:56:44 +0000276#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XBF_STALE)
277#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
278#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
Nathan Scottce8e9222006-01-11 15:39:08 +1100279#define XFS_BUF_SUPER_STALE(bp) do { \
280 XFS_BUF_STALE(bp); \
281 xfs_buf_delwri_dequeue(bp); \
282 XFS_BUF_DONE(bp); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 } while (0)
284
Nathan Scottce8e9222006-01-11 15:39:08 +1100285#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
286#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
287#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Nathan Scottce8e9222006-01-11 15:39:08 +1100289#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
290#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
291#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Nathan Scottce8e9222006-01-11 15:39:08 +1100293#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
294#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
295#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Nathan Scottce8e9222006-01-11 15:39:08 +1100297#define XFS_BUF_BUSY(bp) do { } while (0)
298#define XFS_BUF_UNBUSY(bp) do { } while (0)
299#define XFS_BUF_ISBUSY(bp) (1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Nathan Scottce8e9222006-01-11 15:39:08 +1100301#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
302#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
303#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Nathan Scottce8e9222006-01-11 15:39:08 +1100305#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
306#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
307#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Nathan Scottce8e9222006-01-11 15:39:08 +1100309#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
310#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
311#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
312#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Nathan Scottce8e9222006-01-11 15:39:08 +1100314#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
315#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
316#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Nathan Scottce8e9222006-01-11 15:39:08 +1100318#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
319#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
320#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Nathan Scottce8e9222006-01-11 15:39:08 +1100322#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
323#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
324#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
325#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
Nathan Scottce8e9222006-01-11 15:39:08 +1100326#define XFS_BUF_SET_START(bp) do { } while (0)
327#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Nathan Scottce8e9222006-01-11 15:39:08 +1100329#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
330#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
331#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
332#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
333#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
334#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
335#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
336#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
337#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
338#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Nathan Scottce8e9222006-01-11 15:39:08 +1100340#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
341#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
342#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Christoph Hellwig4d16e922010-06-23 18:11:15 +1000344#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count))
Nathan Scottce8e9222006-01-11 15:39:08 +1100345
346#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
347#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
348#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
349#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
David Chinnerb4dd3302008-08-13 16:36:11 +1000350#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
Nathan Scottce8e9222006-01-11 15:39:08 +1100351
352#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
353#define XFS_BUF_TARGET(bp) ((bp)->b_target)
354#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
355
Nathan Scottce8e9222006-01-11 15:39:08 +1100356static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Nathan Scottce8e9222006-01-11 15:39:08 +1100358 if (!bp->b_relse)
359 xfs_buf_unlock(bp);
360 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363/*
364 * Handling of buftargs.
365 */
Dave Chinnerebad8612010-09-22 10:47:20 +1000366extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
367 struct block_device *, int, const char *);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500368extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369extern void xfs_wait_buftarg(xfs_buftarg_t *);
370extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
Dave Chinnerd808f612010-02-02 10:13:42 +1100372
Tim Shimmine6a0e9c2007-05-08 13:49:59 +1000373#ifdef CONFIG_KDB_MODULES
374extern struct list_head *xfs_get_buftarg_list(void);
375#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Nathan Scottce8e9222006-01-11 15:39:08 +1100377#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
378#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
379
380#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
381#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383#endif /* __XFS_BUF_H__ */