blob: 2a05614f0b920c672a3d5950aef3701f91aab465 [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 */
54#define XBF_FS_MANAGED (1 << 8) /* filesystem controls freeing memory */
55#define XBF_ORDERED (1 << 11)/* use ordered writes */
56#define XBF_READ_AHEAD (1 << 12)/* asynchronous read-ahead */
57#define XBF_LOG_BUFFER (1 << 13)/* this is a buffer used for the log */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100059/* flags used only as arguments to access routines */
60#define XBF_LOCK (1 << 14)/* lock requested */
61#define XBF_TRYLOCK (1 << 15)/* lock requested, but do not wait */
62#define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100064/* flags used only internally */
65#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */
66#define _XBF_PAGES (1 << 18)/* backed by refcounted pages */
67#define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */
68#define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100069
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100070/*
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#define _XBF_PAGE_LOCKED (1 << 22)
Christoph Hellwig73f6aa42008-10-10 17:28:29 +110088
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100089/*
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#define _XFS_BARRIER_FAILED (1 << 23)
96
97typedef unsigned int 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_hashshift;
141 xfs_bufhash_t *bt_hash;
David Chinnera6867a62006-01-11 15:37:58 +1100142
143 /* per device delwri queue */
144 struct task_struct *bt_task;
145 struct list_head bt_list;
146 struct list_head bt_delwrite_queue;
147 spinlock_t bt_delwrite_lock;
Nathan Scottce8e9222006-01-11 15:39:08 +1100148 unsigned long bt_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149} xfs_buftarg_t;
150
151/*
Nathan Scottce8e9222006-01-11 15:39:08 +1100152 * xfs_buf_t: Buffer structure for pagecache-based buffers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 *
Nathan Scottce8e9222006-01-11 15:39:08 +1100154 * This buffer structure is used by the pagecache buffer management routines
155 * to refer to an assembly of pages forming a logical buffer.
156 *
157 * The buffer structure is used on a temporary basis only, and discarded when
158 * released. The real data storage is recorded in the pagecache. Buffers are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * hashed to the block device on which the file system resides.
160 */
161
162struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100163typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
164typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
165typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Nathan Scottce8e9222006-01-11 15:39:08 +1100167#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169typedef struct xfs_buf {
Nathan Scottce8e9222006-01-11 15:39:08 +1100170 struct semaphore b_sema; /* semaphore for lockables */
171 unsigned long b_queuetime; /* time buffer was queued */
172 atomic_t b_pin_count; /* pin count */
173 wait_queue_head_t b_waiters; /* unpin waiters */
174 struct list_head b_list;
175 xfs_buf_flags_t b_flags; /* status flags */
176 struct list_head b_hash_list; /* hash table list */
177 xfs_bufhash_t *b_hash; /* hash table list start */
178 xfs_buftarg_t *b_target; /* buffer target (device) */
179 atomic_t b_hold; /* reference count */
180 xfs_daddr_t b_bn; /* block number for I/O */
181 xfs_off_t b_file_offset; /* offset in file */
182 size_t b_buffer_length;/* size of buffer in bytes */
183 size_t b_count_desired;/* desired transfer size */
184 void *b_addr; /* virtual address of buffer */
185 struct work_struct b_iodone_work;
186 atomic_t b_io_remaining; /* #outstanding I/O requests */
187 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;
Christoph Hellwig15ac08a2008-12-09 04:47:30 -0500192 struct xfs_mount *b_mount;
Nathan Scottce8e9222006-01-11 15:39:08 +1100193 unsigned short b_error; /* error code on I/O */
Nathan Scottce8e9222006-01-11 15:39:08 +1100194 unsigned int b_page_count; /* size of page array */
195 unsigned int b_offset; /* page offset in first page */
196 struct page **b_pages; /* array of page pointers */
197 struct page *b_page_array[XB_PAGES]; /* inline pages */
198#ifdef XFS_BUF_LOCK_TRACKING
199 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#endif
201} xfs_buf_t;
202
203
204/* Finding and Reading Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100205extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
206 xfs_buf_flags_t, xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207#define xfs_incore(buftarg,blkno,len,lockit) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100208 _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Christoph Hellwig6ad112b2009-11-24 18:02:23 +0000210extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t,
Nathan Scottce8e9222006-01-11 15:39:08 +1100211 xfs_buf_flags_t);
Christoph Hellwig6ad112b2009-11-24 18:02:23 +0000212extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
Nathan Scottce8e9222006-01-11 15:39:08 +1100213 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Nathan Scottce8e9222006-01-11 15:39:08 +1100215extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
216extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
217extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
218extern void xfs_buf_hold(xfs_buf_t *);
219extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
220 xfs_buf_flags_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100223extern void xfs_buf_free(xfs_buf_t *);
224extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226/* Locking and Unlocking Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100227extern int xfs_buf_cond_lock(xfs_buf_t *);
228extern int xfs_buf_lock_value(xfs_buf_t *);
229extern void xfs_buf_lock(xfs_buf_t *);
230extern void xfs_buf_unlock(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232/* Buffer Read and Write Routines */
Christoph Hellwig64e0bc72010-01-13 22:17:58 +0000233extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
Christoph Hellwig5d765b92008-12-03 12:20:26 +0100234extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
Christoph Hellwig4e234712010-01-13 22:17:56 +0000235
236extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
237extern int xfs_bdstrat_cb(struct xfs_buf *);
238
Nathan Scottce8e9222006-01-11 15:39:08 +1100239extern void xfs_buf_ioend(xfs_buf_t *, int);
240extern void xfs_buf_ioerror(xfs_buf_t *, int);
Nathan Scottce8e9222006-01-11 15:39:08 +1100241extern int xfs_buf_iorequest(xfs_buf_t *);
242extern int xfs_buf_iowait(xfs_buf_t *);
Dave Chinnerb9c48642010-01-20 10:47:39 +1100243extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
Nathan Scottce8e9222006-01-11 15:39:08 +1100244 xfs_buf_rw_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Nathan Scottce8e9222006-01-11 15:39:08 +1100246static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Nathan Scottce8e9222006-01-11 15:39:08 +1100248 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
251/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100252extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/* Delayed Write Buffer Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100255extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
Dave Chinnerd808f612010-02-02 10:13:42 +1100256extern void xfs_buf_delwri_promote(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100259extern int xfs_buf_init(void);
260extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Nathan Scottce8e9222006-01-11 15:39:08 +1100262#define xfs_buf_target_name(target) \
263 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265
Nathan Scottce8e9222006-01-11 15:39:08 +1100266#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
Nathan Scottf5faad72006-07-28 17:04:44 +1000267#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
268 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Christoph Hellwig0cadda12010-01-19 09:56:44 +0000270#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XBF_STALE)
271#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
272#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
Nathan Scottce8e9222006-01-11 15:39:08 +1100273#define XFS_BUF_SUPER_STALE(bp) do { \
274 XFS_BUF_STALE(bp); \
275 xfs_buf_delwri_dequeue(bp); \
276 XFS_BUF_DONE(bp); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 } while (0)
278
Nathan Scottce8e9222006-01-11 15:39:08 +1100279#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Nathan Scottce8e9222006-01-11 15:39:08 +1100281#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
282#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
283#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Nathan Scottce8e9222006-01-11 15:39:08 +1100285#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
286#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
287#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Nathan Scottce8e9222006-01-11 15:39:08 +1100289#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
290#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
291#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Nathan Scottce8e9222006-01-11 15:39:08 +1100293#define XFS_BUF_BUSY(bp) do { } while (0)
294#define XFS_BUF_UNBUSY(bp) do { } while (0)
295#define XFS_BUF_ISBUSY(bp) (1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Nathan Scottce8e9222006-01-11 15:39:08 +1100297#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
298#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
299#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Nathan Scottce8e9222006-01-11 15:39:08 +1100301#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
302#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
303#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Nathan Scottce8e9222006-01-11 15:39:08 +1100305#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
306#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
307#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
308#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Nathan Scottce8e9222006-01-11 15:39:08 +1100310#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
311#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
312#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Nathan Scottce8e9222006-01-11 15:39:08 +1100314#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
315#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
316#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Nathan Scottce8e9222006-01-11 15:39:08 +1100318#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
319#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
320#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
321#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
Nathan Scottce8e9222006-01-11 15:39:08 +1100322#define XFS_BUF_SET_START(bp) do { } while (0)
323#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Nathan Scottce8e9222006-01-11 15:39:08 +1100325#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
326#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
327#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
328#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
329#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
330#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
331#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
332#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
333#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
334#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Nathan Scottce8e9222006-01-11 15:39:08 +1100336#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0)
337#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
338#define XFS_BUF_SET_REF(bp, ref) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Christoph Hellwig4d16e922010-06-23 18:11:15 +1000340#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count))
Nathan Scottce8e9222006-01-11 15:39:08 +1100341
342#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
343#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
344#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
345#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
David Chinnerb4dd3302008-08-13 16:36:11 +1000346#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
Nathan Scottce8e9222006-01-11 15:39:08 +1100347
348#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
349#define XFS_BUF_TARGET(bp) ((bp)->b_target)
350#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
351
Nathan Scottce8e9222006-01-11 15:39:08 +1100352static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
Nathan Scottce8e9222006-01-11 15:39:08 +1100354 if (!bp->b_relse)
355 xfs_buf_unlock(bp);
356 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
Nathan Scottce8e9222006-01-11 15:39:08 +1100359#define xfs_biodone(bp) xfs_buf_ioend(bp, 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Nathan Scottce8e9222006-01-11 15:39:08 +1100361#define xfs_biomove(bp, off, len, data, rw) \
362 xfs_buf_iomove((bp), (off), (len), (data), \
Christoph Hellwig0cadda12010-01-19 09:56:44 +0000363 ((rw) == XBF_WRITE) ? XBRW_WRITE : XBRW_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Nathan Scottce8e9222006-01-11 15:39:08 +1100365#define xfs_biozero(bp, off, len) \
366 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Nathan Scottce8e9222006-01-11 15:39:08 +1100368#define xfs_iowait(bp) xfs_buf_iowait(bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370#define xfs_baread(target, rablkno, ralen) \
Nathan Scottce8e9222006-01-11 15:39:08 +1100371 xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373
374/*
375 * Handling of buftargs.
376 */
Jan Engelhardte2a07812010-03-23 09:52:55 +1100377extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int, const char *);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500378extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379extern void xfs_wait_buftarg(xfs_buftarg_t *);
380extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
Dave Chinnerd808f612010-02-02 10:13:42 +1100382
Tim Shimmine6a0e9c2007-05-08 13:49:59 +1000383#ifdef CONFIG_KDB_MODULES
384extern struct list_head *xfs_get_buftarg_list(void);
385#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Nathan Scottce8e9222006-01-11 15:39:08 +1100387#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
388#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
389
390#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
391#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393#endif /* __XFS_BUF_H__ */