blob: 1cf21a4a9f221de465299bf820fa710c3b3aa40e [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/mm.h>
25#include <linux/fs.h>
26#include <linux/buffer_head.h>
27#include <linux/uio.h>
Dave Chinnere80dfa12013-08-28 10:18:05 +100028#include <linux/list_lru.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
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 +110036typedef enum {
37 XBRW_READ = 1, /* transfer into target memory */
38 XBRW_WRITE = 2, /* transfer from target memory */
39 XBRW_ZERO = 3, /* Zero target memory */
40} xfs_buf_rw_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030042#define XBF_READ (1 << 0) /* buffer intended for reading from device */
43#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
44#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
45#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
46#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
47#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
Dave Chinnerac8809f2013-12-12 16:34:38 +110048#define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020049
50/* I/O hints for the BIO layer */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030051#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */
52#define XBF_FUA (1 << 11)/* force cache write through mode */
53#define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100055/* flags used only as arguments to access routines */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030056#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */
57#define XBF_UNMAPPED (1 << 17)/* do not map the buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100059/* flags used only internally */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030060#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
61#define _XBF_KMEM (1 << 21)/* backed by heap memory */
62#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
63#define _XBF_COMPOUND (1 << 23)/* compound buffer */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100064
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100065typedef unsigned int xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000067#define XFS_BUF_FLAGS \
68 { XBF_READ, "READ" }, \
69 { XBF_WRITE, "WRITE" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020070 { XBF_READ_AHEAD, "READ_AHEAD" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000071 { XBF_ASYNC, "ASYNC" }, \
72 { XBF_DONE, "DONE" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000073 { XBF_STALE, "STALE" }, \
Dave Chinnerac8809f2013-12-12 16:34:38 +110074 { XBF_WRITE_FAIL, "WRITE_FAIL" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020075 { XBF_SYNCIO, "SYNCIO" }, \
76 { XBF_FUA, "FUA" }, \
77 { XBF_FLUSH, "FLUSH" }, \
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030078 { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\
Dave Chinner611c9942012-04-23 15:59:07 +100079 { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000080 { _XBF_PAGES, "PAGES" }, \
Dave Chinner0e6e8472011-03-26 09:16:45 +110081 { _XBF_KMEM, "KMEM" }, \
Dave Chinnercbb7baa2012-06-22 18:50:08 +100082 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
Dave Chinnera4082352013-08-28 10:18:06 +100083 { _XBF_COMPOUND, "COMPOUND" }
84
Dave Chinnerac8809f2013-12-12 16:34:38 +110085
Dave Chinnera4082352013-08-28 10:18:06 +100086/*
87 * Internal state flags.
88 */
89#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +110092 dev_t bt_dev;
93 struct block_device *bt_bdev;
Dave Chinner0e6e8472011-03-26 09:16:45 +110094 struct backing_dev_info *bt_bdi;
Dave Chinnerebad8612010-09-22 10:47:20 +100095 struct xfs_mount *bt_mount;
Nathan Scottce8e9222006-01-11 15:39:08 +110096 unsigned int bt_bsize;
97 unsigned int bt_sshift;
98 size_t bt_smask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Dave Chinnerff57ab22010-11-30 17:27:57 +1100100 /* LRU control structures */
101 struct shrinker bt_shrinker;
Dave Chinnere80dfa12013-08-28 10:18:05 +1000102 struct list_lru bt_lru;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103} xfs_buftarg_t;
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100106typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100108
Nathan Scottce8e9222006-01-11 15:39:08 +1100109#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Dave Chinnercbb7baa2012-06-22 18:50:08 +1000111struct xfs_buf_map {
112 xfs_daddr_t bm_bn; /* block number for I/O */
113 int bm_len; /* size of I/O */
114};
115
Dave Chinner3e85c862012-06-22 18:50:09 +1000116#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
117 struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
118
Dave Chinner1813dd62012-11-14 17:54:40 +1100119struct xfs_buf_ops {
120 void (*verify_read)(struct xfs_buf *);
121 void (*verify_write)(struct xfs_buf *);
122};
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124typedef struct xfs_buf {
Dave Chinner50f59e82010-09-24 19:59:15 +1000125 /*
126 * first cacheline holds all the fields needed for an uncontended cache
127 * hit to be fully processed. The semaphore straddles the cacheline
128 * boundary, but the counter and lock sits on the first cacheline,
129 * which is the only bit that is touched if we hit the semaphore
130 * fast-path on locking.
131 */
Dave Chinner74f75a02010-09-24 19:59:04 +1000132 struct rb_node b_rbnode; /* rbtree node */
Dave Chinnercbb7baa2012-06-22 18:50:08 +1000133 xfs_daddr_t b_bn; /* block number of buffer */
Dave Chinner4e94b712012-04-23 15:58:51 +1000134 int b_length; /* size of buffer in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000135 atomic_t b_hold; /* reference count */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100136 atomic_t b_lru_ref; /* lru reclaim ref count */
Dave Chinner50f59e82010-09-24 19:59:15 +1000137 xfs_buf_flags_t b_flags; /* status flags */
138 struct semaphore b_sema; /* semaphore for lockables */
139
Carlos Maiolino6fb8a902012-08-10 15:01:51 -0300140 /*
141 * concurrent access to b_lru and b_lru_flags are protected by
142 * bt_lru_lock and not by b_sema
143 */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100144 struct list_head b_lru; /* lru list */
Dave Chinnera4082352013-08-28 10:18:06 +1000145 spinlock_t b_lock; /* internal state lock */
146 unsigned int b_state; /* internal state flags */
Dave Chinner50f59e82010-09-24 19:59:15 +1000147 wait_queue_head_t b_waiters; /* unpin waiters */
148 struct list_head b_list;
149 struct xfs_perag *b_pag; /* contains rbtree root */
150 xfs_buftarg_t *b_target; /* buffer target (device) */
Nathan Scottce8e9222006-01-11 15:39:08 +1100151 void *b_addr; /* virtual address of buffer */
152 struct work_struct b_iodone_work;
Nathan Scottce8e9222006-01-11 15:39:08 +1100153 xfs_buf_iodone_t b_iodone; /* I/O completion function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000154 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100155 void *b_fspriv;
Christoph Hellwigbf9d9012011-07-13 13:43:49 +0200156 struct xfs_trans *b_transp;
Nathan Scottce8e9222006-01-11 15:39:08 +1100157 struct page **b_pages; /* array of page pointers */
158 struct page *b_page_array[XB_PAGES]; /* inline pages */
Dave Chinner3e85c862012-06-22 18:50:09 +1000159 struct xfs_buf_map *b_maps; /* compound buffer map */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600160 struct xfs_buf_map __b_map; /* inline compound buffer map */
Dave Chinner3e85c862012-06-22 18:50:09 +1000161 int b_map_count;
Dave Chinneraa0e8832012-04-23 15:58:52 +1000162 int b_io_length; /* IO size in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000163 atomic_t b_pin_count; /* pin count */
164 atomic_t b_io_remaining; /* #outstanding I/O requests */
165 unsigned int b_page_count; /* size of page array */
166 unsigned int b_offset; /* page offset in first page */
167 unsigned short b_error; /* error code on I/O */
Dave Chinner1813dd62012-11-14 17:54:40 +1100168 const struct xfs_buf_ops *b_ops;
Dave Chinnercfb02852012-11-12 22:54:19 +1100169
Nathan Scottce8e9222006-01-11 15:39:08 +1100170#ifdef XFS_BUF_LOCK_TRACKING
171 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172#endif
173} xfs_buf_t;
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175/* Finding and Reading Buffers */
Dave Chinner3e85c862012-06-22 18:50:09 +1000176struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
177 struct xfs_buf_map *map, int nmaps,
178 xfs_buf_flags_t flags, struct xfs_buf *new_bp);
179
180static inline struct xfs_buf *
181xfs_incore(
182 struct xfs_buftarg *target,
183 xfs_daddr_t blkno,
184 size_t numblks,
185 xfs_buf_flags_t flags)
186{
187 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
188 return _xfs_buf_find(target, &map, 1, flags, NULL);
189}
190
191struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
192 struct xfs_buf_map *map, int nmaps,
193 xfs_buf_flags_t flags);
194
195static inline struct xfs_buf *
196xfs_buf_alloc(
197 struct xfs_buftarg *target,
198 xfs_daddr_t blkno,
199 size_t numblks,
200 xfs_buf_flags_t flags)
201{
202 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
203 return _xfs_buf_alloc(target, &map, 1, flags);
204}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Dave Chinner6dde2702012-06-22 18:50:10 +1000206struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
207 struct xfs_buf_map *map, int nmaps,
208 xfs_buf_flags_t flags);
209struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
210 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100211 xfs_buf_flags_t flags,
212 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000213void xfs_buf_readahead_map(struct xfs_buftarg *target,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100214 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100215 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000216
217static inline struct xfs_buf *
218xfs_buf_get(
219 struct xfs_buftarg *target,
220 xfs_daddr_t blkno,
221 size_t numblks,
222 xfs_buf_flags_t flags)
223{
224 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
225 return xfs_buf_get_map(target, &map, 1, flags);
226}
227
228static inline struct xfs_buf *
229xfs_buf_read(
230 struct xfs_buftarg *target,
231 xfs_daddr_t blkno,
232 size_t numblks,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100233 xfs_buf_flags_t flags,
Dave Chinner1813dd62012-11-14 17:54:40 +1100234 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000235{
236 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100237 return xfs_buf_read_map(target, &map, 1, flags, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000238}
239
240static inline void
241xfs_buf_readahead(
242 struct xfs_buftarg *target,
243 xfs_daddr_t blkno,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100244 size_t numblks,
Dave Chinner1813dd62012-11-14 17:54:40 +1100245 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000246{
247 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100248 return xfs_buf_readahead_map(target, &map, 1, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000249}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Dave Chinnere70b73f2012-04-23 15:58:49 +1000251struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000252void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
253int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
254
255struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
256 int flags);
257struct xfs_buf *xfs_buf_read_uncached(struct xfs_buftarg *target,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100258 xfs_daddr_t daddr, size_t numblks, int flags,
Dave Chinner1813dd62012-11-14 17:54:40 +1100259 const struct xfs_buf_ops *ops);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000260void xfs_buf_hold(struct xfs_buf *bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100263extern void xfs_buf_free(xfs_buf_t *);
264extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266/* Locking and Unlocking Buffers */
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200267extern int xfs_buf_trylock(xfs_buf_t *);
Nathan Scottce8e9222006-01-11 15:39:08 +1100268extern void xfs_buf_lock(xfs_buf_t *);
269extern void xfs_buf_unlock(xfs_buf_t *);
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200270#define xfs_buf_islocked(bp) \
271 ((bp)->b_sema.count <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273/* Buffer Read and Write Routines */
Christoph Hellwigc2b006c2011-08-23 08:28:07 +0000274extern int xfs_bwrite(struct xfs_buf *bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100275extern void xfs_buf_ioend(xfs_buf_t *, int);
276extern void xfs_buf_ioerror(xfs_buf_t *, int);
Christoph Hellwig901796a2011-10-10 16:52:49 +0000277extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
Dave Chinner0e95f192012-04-23 15:58:46 +1000278extern void xfs_buf_iorequest(xfs_buf_t *);
Nathan Scottce8e9222006-01-11 15:39:08 +1100279extern int xfs_buf_iowait(xfs_buf_t *);
Dave Chinnerb9c48642010-01-20 10:47:39 +1100280extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
Nathan Scottce8e9222006-01-11 15:39:08 +1100281 xfs_buf_rw_t);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +0000282#define xfs_buf_zero(bp, off, len) \
283 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Christoph Hellwig83a0adc2013-12-17 00:03:52 -0800285extern int xfs_bioerror_relse(struct xfs_buf *);
286
Nathan Scottce8e9222006-01-11 15:39:08 +1100287static inline int xfs_buf_geterror(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Nathan Scottce8e9222006-01-11 15:39:08 +1100289 return bp ? bp->b_error : ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
292/* Buffer Utility Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100293extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295/* Delayed Write Buffer Routines */
Christoph Hellwig43ff2122012-04-23 15:58:39 +1000296extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
297extern int xfs_buf_delwri_submit(struct list_head *);
298extern int xfs_buf_delwri_submit_nowait(struct list_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100301extern int xfs_buf_init(void);
302extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +0200304#define XFS_BUF_ZEROFLAGS(bp) \
Christoph Hellwig43ff2122012-04-23 15:58:39 +1000305 ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \
Dave Chinnerac8809f2013-12-12 16:34:38 +1100306 XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \
307 XBF_WRITE_FAIL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Dave Chinner430cbeb2010-12-02 16:30:55 +1100309void xfs_buf_stale(struct xfs_buf *bp);
Christoph Hellwig0cadda12010-01-19 09:56:44 +0000310#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
311#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Nathan Scottce8e9222006-01-11 15:39:08 +1100313#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
314#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
315#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Nathan Scottce8e9222006-01-11 15:39:08 +1100317#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
318#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
319#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Nathan Scottce8e9222006-01-11 15:39:08 +1100321#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
322#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
323#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Nathan Scottce8e9222006-01-11 15:39:08 +1100325#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
326#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
327#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Dave Chinnercbb7baa2012-06-22 18:50:08 +1000329/*
330 * These macros use the IO block map rather than b_bn. b_bn is now really
331 * just for the buffer cache index for cached buffers. As IO does not use b_bn
332 * anymore, uncached buffers do not use b_bn at all and hence must modify the IO
333 * map directly. Uncached buffers are not allowed to be discontiguous, so this
334 * is safe to do.
335 *
336 * In future, uncached buffers will pass the block number directly to the io
337 * request function and hence these macros will go away at that point.
338 */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600339#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn)
340#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Christoph Hellwig38f23232011-10-10 16:52:45 +0000342static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
Dave Chinner821eb212010-12-02 16:31:13 +1100343{
344 atomic_set(&bp->b_lru_ref, lru_ref);
345}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Chandra Seetharaman811e64c2011-07-22 23:40:27 +0000347static inline int xfs_buf_ispinned(struct xfs_buf *bp)
348{
349 return atomic_read(&bp->b_pin_count);
350}
Nathan Scottce8e9222006-01-11 15:39:08 +1100351
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{
Christoph Hellwigbfc60172011-01-07 13:02:23 +0000354 xfs_buf_unlock(bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100355 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358/*
359 * Handling of buftargs.
360 */
Dave Chinnerebad8612010-09-22 10:47:20 +1000361extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
362 struct block_device *, int, const char *);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500363extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364extern void xfs_wait_buftarg(xfs_buftarg_t *);
365extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
Dave Chinnerd808f612010-02-02 10:13:42 +1100366
Nathan Scottce8e9222006-01-11 15:39:08 +1100367#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
368#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370#endif /* __XFS_BUF_H__ */