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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/mm.h>
25#include <linux/fs.h>
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070026#include <linux/dax.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/buffer_head.h>
28#include <linux/uio.h>
Dave Chinnere80dfa12013-08-28 10:18:05 +100029#include <linux/list_lru.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31/*
32 * Base types
33 */
34
Nathan Scottce8e9222006-01-11 15:39:08 +110035#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Nathan Scottce8e9222006-01-11 15:39:08 +110037typedef enum {
38 XBRW_READ = 1, /* transfer into target memory */
39 XBRW_WRITE = 2, /* transfer from target memory */
40 XBRW_ZERO = 3, /* Zero target memory */
41} xfs_buf_rw_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030043#define XBF_READ (1 << 0) /* buffer intended for reading from device */
44#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
45#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
Brian Fosterc891c302016-07-20 11:13:43 +100046#define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030047#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
48#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
49#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
Dave Chinnerac8809f2013-12-12 16:34:38 +110050#define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020051
52/* I/O hints for the BIO layer */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030053#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */
54#define XBF_FUA (1 << 11)/* force cache write through mode */
55#define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100057/* flags used only as arguments to access routines */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030058#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */
59#define XBF_UNMAPPED (1 << 17)/* do not map the buffer */
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100061/* flags used only internally */
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030062#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
63#define _XBF_KMEM (1 << 21)/* backed by heap memory */
64#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
65#define _XBF_COMPOUND (1 << 23)/* compound buffer */
Christoph Hellwig6ab455e2008-05-19 16:34:42 +100066
Christoph Hellwig807cbbd2010-06-24 11:49:12 +100067typedef unsigned int xfs_buf_flags_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000069#define XFS_BUF_FLAGS \
70 { XBF_READ, "READ" }, \
71 { XBF_WRITE, "WRITE" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020072 { XBF_READ_AHEAD, "READ_AHEAD" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000073 { XBF_ASYNC, "ASYNC" }, \
74 { XBF_DONE, "DONE" }, \
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000075 { XBF_STALE, "STALE" }, \
Dave Chinnerac8809f2013-12-12 16:34:38 +110076 { XBF_WRITE_FAIL, "WRITE_FAIL" }, \
Christoph Hellwig1d5ae5d2011-07-08 14:36:32 +020077 { XBF_SYNCIO, "SYNCIO" }, \
78 { XBF_FUA, "FUA" }, \
79 { XBF_FLUSH, "FLUSH" }, \
Carlos Maiolino6fb8a902012-08-10 15:01:51 -030080 { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\
Dave Chinner611c9942012-04-23 15:59:07 +100081 { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000082 { _XBF_PAGES, "PAGES" }, \
Dave Chinner0e6e8472011-03-26 09:16:45 +110083 { _XBF_KMEM, "KMEM" }, \
Dave Chinnercbb7baab2012-06-22 18:50:08 +100084 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
Brian Foster9c795ff2017-05-31 08:22:52 -070085 { _XBF_COMPOUND, "COMPOUND" }
Dave Chinnera4082352013-08-28 10:18:06 +100086
Dave Chinnerac8809f2013-12-12 16:34:38 +110087
Dave Chinnera4082352013-08-28 10:18:06 +100088/*
89 * Internal state flags.
90 */
91#define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */
Brian Foster9c795ff2017-05-31 08:22:52 -070092#define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000093
Eric Sandeen7c71ee72014-01-21 16:46:23 -060094/*
95 * The xfs_buftarg contains 2 notions of "sector size" -
96 *
97 * 1) The metadata sector size, which is the minimum unit and
98 * alignment of IO which will be performed by metadata operations.
99 * 2) The device logical sector size
100 *
101 * The first is specified at mkfs time, and is stored on-disk in the
102 * superblock's sb_sectsize.
103 *
104 * The latter is derived from the underlying device, and controls direct IO
105 * alignment constraints.
106 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107typedef struct xfs_buftarg {
Nathan Scottce8e9222006-01-11 15:39:08 +1100108 dev_t bt_dev;
109 struct block_device *bt_bdev;
Dave Chinner0e6e8472011-03-26 09:16:45 +1100110 struct backing_dev_info *bt_bdi;
Dave Chinnerebad8612010-09-22 10:47:20 +1000111 struct xfs_mount *bt_mount;
Eric Sandeen6da54172014-01-21 16:45:52 -0600112 unsigned int bt_meta_sectorsize;
113 size_t bt_meta_sectormask;
Eric Sandeen7c71ee72014-01-21 16:46:23 -0600114 size_t bt_logical_sectorsize;
115 size_t bt_logical_sectormask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Dave Chinnerff57ab22010-11-30 17:27:57 +1100117 /* LRU control structures */
118 struct shrinker bt_shrinker;
Dave Chinnere80dfa12013-08-28 10:18:05 +1000119 struct list_lru bt_lru;
Brian Foster9c7504a2016-07-20 11:15:28 +1000120
121 struct percpu_counter bt_io_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122} xfs_buftarg_t;
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124struct xfs_buf;
Nathan Scottce8e9222006-01-11 15:39:08 +1100125typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100127
Nathan Scottce8e9222006-01-11 15:39:08 +1100128#define XB_PAGES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000130struct xfs_buf_map {
131 xfs_daddr_t bm_bn; /* block number for I/O */
132 int bm_len; /* size of I/O */
133};
134
Dave Chinner3e85c862012-06-22 18:50:09 +1000135#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
136 struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
137
Dave Chinner1813dd62012-11-14 17:54:40 +1100138struct xfs_buf_ops {
Eric Sandeen233135b2016-01-04 16:10:19 +1100139 char *name;
Dave Chinner1813dd62012-11-14 17:54:40 +1100140 void (*verify_read)(struct xfs_buf *);
141 void (*verify_write)(struct xfs_buf *);
142};
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144typedef struct xfs_buf {
Dave Chinner50f59e82010-09-24 19:59:15 +1000145 /*
146 * first cacheline holds all the fields needed for an uncontended cache
147 * hit to be fully processed. The semaphore straddles the cacheline
148 * boundary, but the counter and lock sits on the first cacheline,
149 * which is the only bit that is touched if we hit the semaphore
150 * fast-path on locking.
151 */
Dave Chinner74f75a02010-09-24 19:59:04 +1000152 struct rb_node b_rbnode; /* rbtree node */
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000153 xfs_daddr_t b_bn; /* block number of buffer */
Dave Chinner4e94b712012-04-23 15:58:51 +1000154 int b_length; /* size of buffer in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000155 atomic_t b_hold; /* reference count */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100156 atomic_t b_lru_ref; /* lru reclaim ref count */
Dave Chinner50f59e82010-09-24 19:59:15 +1000157 xfs_buf_flags_t b_flags; /* status flags */
158 struct semaphore b_sema; /* semaphore for lockables */
159
Carlos Maiolino6fb8a902012-08-10 15:01:51 -0300160 /*
161 * concurrent access to b_lru and b_lru_flags are protected by
162 * bt_lru_lock and not by b_sema
163 */
Dave Chinner430cbeb2010-12-02 16:30:55 +1100164 struct list_head b_lru; /* lru list */
Dave Chinnera4082352013-08-28 10:18:06 +1000165 spinlock_t b_lock; /* internal state lock */
166 unsigned int b_state; /* internal state flags */
Dave Chinner61be9c52014-10-02 09:04:31 +1000167 int b_io_error; /* internal IO error state */
Dave Chinner50f59e82010-09-24 19:59:15 +1000168 wait_queue_head_t b_waiters; /* unpin waiters */
169 struct list_head b_list;
170 struct xfs_perag *b_pag; /* contains rbtree root */
171 xfs_buftarg_t *b_target; /* buffer target (device) */
Nathan Scottce8e9222006-01-11 15:39:08 +1100172 void *b_addr; /* virtual address of buffer */
Brian Fosterb29c70f2014-12-04 09:43:17 +1100173 struct work_struct b_ioend_work;
174 struct workqueue_struct *b_ioend_wq; /* I/O completion wq */
Nathan Scottce8e9222006-01-11 15:39:08 +1100175 xfs_buf_iodone_t b_iodone; /* I/O completion function */
David Chinnerb4dd3302008-08-13 16:36:11 +1000176 struct completion b_iowait; /* queue for I/O waiters */
Nathan Scottce8e9222006-01-11 15:39:08 +1100177 void *b_fspriv;
Christoph Hellwigbf9d9012011-07-13 13:43:49 +0200178 struct xfs_trans *b_transp;
Nathan Scottce8e9222006-01-11 15:39:08 +1100179 struct page **b_pages; /* array of page pointers */
180 struct page *b_page_array[XB_PAGES]; /* inline pages */
Dave Chinner3e85c862012-06-22 18:50:09 +1000181 struct xfs_buf_map *b_maps; /* compound buffer map */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600182 struct xfs_buf_map __b_map; /* inline compound buffer map */
Dave Chinner3e85c862012-06-22 18:50:09 +1000183 int b_map_count;
Dave Chinneraa0e8832012-04-23 15:58:52 +1000184 int b_io_length; /* IO size in BBs */
Dave Chinner50f59e82010-09-24 19:59:15 +1000185 atomic_t b_pin_count; /* pin count */
186 atomic_t b_io_remaining; /* #outstanding I/O requests */
187 unsigned int b_page_count; /* size of page array */
188 unsigned int b_offset; /* page offset in first page */
Dave Chinner24513372014-06-25 14:58:08 +1000189 int b_error; /* error code on I/O */
Carlos Maiolinoa5ea70d2016-05-18 11:08:15 +1000190
191 /*
192 * async write failure retry count. Initialised to zero on the first
193 * failure, then when it exceeds the maximum configured without a
194 * success the write is considered to be failed permanently and the
195 * iodone handler will take appropriate action.
196 *
197 * For retry timeouts, we record the jiffie of the first failure. This
198 * means that we can change the retry timeout for buffers already under
199 * I/O and thus avoid getting stuck in a retry loop with a long timeout.
200 *
201 * last_error is used to ensure that we are getting repeated errors, not
202 * different errors. e.g. a block device might change ENOSPC to EIO when
203 * a failure timeout occurs, so we want to re-initialise the error
204 * retry behaviour appropriately when that happens.
205 */
206 int b_retries;
207 unsigned long b_first_retry_time; /* in jiffies */
208 int b_last_error;
209
Dave Chinner1813dd62012-11-14 17:54:40 +1100210 const struct xfs_buf_ops *b_ops;
Dave Chinnercfb02852012-11-12 22:54:19 +1100211
Nathan Scottce8e9222006-01-11 15:39:08 +1100212#ifdef XFS_BUF_LOCK_TRACKING
213 int b_last_holder;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214#endif
215} xfs_buf_t;
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217/* Finding and Reading Buffers */
Dave Chinner3e85c862012-06-22 18:50:09 +1000218struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
219 struct xfs_buf_map *map, int nmaps,
220 xfs_buf_flags_t flags, struct xfs_buf *new_bp);
221
222static inline struct xfs_buf *
223xfs_incore(
224 struct xfs_buftarg *target,
225 xfs_daddr_t blkno,
226 size_t numblks,
227 xfs_buf_flags_t flags)
228{
229 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
230 return _xfs_buf_find(target, &map, 1, flags, NULL);
231}
232
233struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
234 struct xfs_buf_map *map, int nmaps,
235 xfs_buf_flags_t flags);
236
237static inline struct xfs_buf *
238xfs_buf_alloc(
239 struct xfs_buftarg *target,
240 xfs_daddr_t blkno,
241 size_t numblks,
242 xfs_buf_flags_t flags)
243{
244 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
245 return _xfs_buf_alloc(target, &map, 1, flags);
246}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Dave Chinner6dde2702012-06-22 18:50:10 +1000248struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
249 struct xfs_buf_map *map, int nmaps,
250 xfs_buf_flags_t flags);
251struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
252 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100253 xfs_buf_flags_t flags,
254 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000255void xfs_buf_readahead_map(struct xfs_buftarg *target,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100256 struct xfs_buf_map *map, int nmaps,
Dave Chinner1813dd62012-11-14 17:54:40 +1100257 const struct xfs_buf_ops *ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000258
259static inline struct xfs_buf *
260xfs_buf_get(
261 struct xfs_buftarg *target,
262 xfs_daddr_t blkno,
263 size_t numblks,
264 xfs_buf_flags_t flags)
265{
266 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
267 return xfs_buf_get_map(target, &map, 1, flags);
268}
269
270static inline struct xfs_buf *
271xfs_buf_read(
272 struct xfs_buftarg *target,
273 xfs_daddr_t blkno,
274 size_t numblks,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100275 xfs_buf_flags_t flags,
Dave Chinner1813dd62012-11-14 17:54:40 +1100276 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000277{
278 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100279 return xfs_buf_read_map(target, &map, 1, flags, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000280}
281
282static inline void
283xfs_buf_readahead(
284 struct xfs_buftarg *target,
285 xfs_daddr_t blkno,
Dave Chinnerc3f8fc72012-11-12 22:54:01 +1100286 size_t numblks,
Dave Chinner1813dd62012-11-14 17:54:40 +1100287 const struct xfs_buf_ops *ops)
Dave Chinner6dde2702012-06-22 18:50:10 +1000288{
289 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
Dave Chinner1813dd62012-11-14 17:54:40 +1100290 return xfs_buf_readahead_map(target, &map, 1, ops);
Dave Chinner6dde2702012-06-22 18:50:10 +1000291}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Dave Chinnere70b73f2012-04-23 15:58:49 +1000293struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000294void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
295int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
296
297struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
298 int flags);
Dave Chinnerba372672014-10-02 09:05:32 +1000299int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
300 size_t numblks, int flags, struct xfs_buf **bpp,
301 const struct xfs_buf_ops *ops);
Dave Chinnere70b73f2012-04-23 15:58:49 +1000302void xfs_buf_hold(struct xfs_buf *bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304/* Releasing Buffers */
Nathan Scottce8e9222006-01-11 15:39:08 +1100305extern void xfs_buf_free(xfs_buf_t *);
306extern void xfs_buf_rele(xfs_buf_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
308/* Locking and Unlocking Buffers */
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200309extern int xfs_buf_trylock(xfs_buf_t *);
Nathan Scottce8e9222006-01-11 15:39:08 +1100310extern void xfs_buf_lock(xfs_buf_t *);
311extern void xfs_buf_unlock(xfs_buf_t *);
Christoph Hellwig0c842ad2011-07-08 14:36:19 +0200312#define xfs_buf_islocked(bp) \
313 ((bp)->b_sema.count <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315/* Buffer Read and Write Routines */
Christoph Hellwigc2b006c2011-08-23 08:28:07 +0000316extern int xfs_bwrite(struct xfs_buf *bp);
Dave Chinnere8aaba92014-10-02 09:04:22 +1000317extern void xfs_buf_ioend(struct xfs_buf *bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100318extern void xfs_buf_ioerror(xfs_buf_t *, int);
Christoph Hellwig901796a2011-10-10 16:52:49 +0000319extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
Dave Chinner595bff72014-10-02 09:05:14 +1000320extern void xfs_buf_submit(struct xfs_buf *bp);
321extern int xfs_buf_submit_wait(struct xfs_buf *bp);
Dave Chinnerb9c48642010-01-20 10:47:39 +1100322extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
Nathan Scottce8e9222006-01-11 15:39:08 +1100323 xfs_buf_rw_t);
Christoph Hellwig1a1a3e92010-10-06 18:41:18 +0000324#define xfs_buf_zero(bp, off, len) \
325 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327/* Buffer Utility Routines */
Christoph Hellwig88ee2df2015-06-22 09:44:29 +1000328extern void *xfs_buf_offset(struct xfs_buf *, size_t);
Dave Chinner5cfd28b2016-02-10 15:01:11 +1100329extern void xfs_buf_stale(struct xfs_buf *bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/* Delayed Write Buffer Routines */
Brian Foster10f0b2c2017-04-21 12:40:44 -0700332extern void xfs_buf_delwri_cancel(struct list_head *);
Christoph Hellwig43ff2122012-04-23 15:58:39 +1000333extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
334extern int xfs_buf_delwri_submit(struct list_head *);
335extern int xfs_buf_delwri_submit_nowait(struct list_head *);
Brian Foster7cb011b2017-06-14 21:21:45 -0700336extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338/* Buffer Daemon Setup Routines */
Nathan Scottce8e9222006-01-11 15:39:08 +1100339extern int xfs_buf_init(void);
340extern void xfs_buf_terminate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Dave Chinnercbb7baab2012-06-22 18:50:08 +1000342/*
343 * These macros use the IO block map rather than b_bn. b_bn is now really
344 * just for the buffer cache index for cached buffers. As IO does not use b_bn
345 * anymore, uncached buffers do not use b_bn at all and hence must modify the IO
346 * map directly. Uncached buffers are not allowed to be discontiguous, so this
347 * is safe to do.
348 *
349 * In future, uncached buffers will pass the block number directly to the io
350 * request function and hence these macros will go away at that point.
351 */
Mark Tinguelyd44d9bc2012-12-04 17:18:02 -0600352#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn)
353#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Christoph Hellwig38f23232011-10-10 16:52:45 +0000355static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
Dave Chinner821eb212010-12-02 16:31:13 +1100356{
357 atomic_set(&bp->b_lru_ref, lru_ref);
358}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Chandra Seetharaman811e64c2011-07-22 23:40:27 +0000360static inline int xfs_buf_ispinned(struct xfs_buf *bp)
361{
362 return atomic_read(&bp->b_pin_count);
363}
Nathan Scottce8e9222006-01-11 15:39:08 +1100364
Nathan Scottce8e9222006-01-11 15:39:08 +1100365static inline void xfs_buf_relse(xfs_buf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Christoph Hellwigbfc60172011-01-07 13:02:23 +0000367 xfs_buf_unlock(bp);
Nathan Scottce8e9222006-01-11 15:39:08 +1100368 xfs_buf_rele(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
Eric Sandeen51582172014-02-27 15:17:27 +1100371static inline int
372xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
373{
374 return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
375 cksum_offset);
376}
377
Eric Sandeenf1dbcd72014-02-27 15:18:23 +1100378static inline void
379xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
380{
381 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
382 cksum_offset);
383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385/*
386 * Handling of buftargs.
387 */
Dave Chinnerebad8612010-09-22 10:47:20 +1000388extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
Eric Sandeen34dcefd2014-04-14 19:01:00 +1000389 struct block_device *);
Christoph Hellwigc141b292009-03-03 14:48:37 -0500390extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391extern void xfs_wait_buftarg(xfs_buftarg_t *);
Eric Sandeena96c4152014-04-14 19:00:29 +1000392extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
Dave Chinnerd808f612010-02-02 10:13:42 +1100393
Nathan Scottce8e9222006-01-11 15:39:08 +1100394#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
395#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397#endif /* __XFS_BUF_H__ */