1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#ifndef __XFS_BUF_H__
19#define __XFS_BUF_H__
20
21#include <linux/list.h>
22#include <linux/types.h>
23#include <linux/spinlock.h>
24#include <linux/mm.h>
25#include <linux/fs.h>
26#include <linux/dax.h>
27#include <linux/buffer_head.h>
28#include <linux/uio.h>
29#include <linux/list_lru.h>
30
31
32
33
34
35#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
36
37typedef enum {
38 XBRW_READ = 1,
39 XBRW_WRITE = 2,
40 XBRW_ZERO = 3,
41} xfs_buf_rw_t;
42
43#define XBF_READ (1 << 0)
44#define XBF_WRITE (1 << 1)
45#define XBF_READ_AHEAD (1 << 2)
46#define XBF_NO_IOACCT (1 << 3)
47#define XBF_ASYNC (1 << 4)
48#define XBF_DONE (1 << 5)
49#define XBF_STALE (1 << 6)
50#define XBF_WRITE_FAIL (1 << 24)
51
52
53#define XBF_SYNCIO (1 << 10)
54#define XBF_FUA (1 << 11)
55#define XBF_FLUSH (1 << 12)
56
57
58#define XBF_TRYLOCK (1 << 16)
59#define XBF_UNMAPPED (1 << 17)
60
61
62#define _XBF_PAGES (1 << 20)
63#define _XBF_KMEM (1 << 21)
64#define _XBF_DELWRI_Q (1 << 22)
65#define _XBF_COMPOUND (1 << 23)
66#define _XBF_IN_FLIGHT (1 << 25)
67
68typedef unsigned int xfs_buf_flags_t;
69
70#define XFS_BUF_FLAGS \
71 { XBF_READ, "READ" }, \
72 { XBF_WRITE, "WRITE" }, \
73 { XBF_READ_AHEAD, "READ_AHEAD" }, \
74 { XBF_NO_IOACCT, "NO_IOACCT" }, \
75 { XBF_ASYNC, "ASYNC" }, \
76 { XBF_DONE, "DONE" }, \
77 { XBF_STALE, "STALE" }, \
78 { XBF_WRITE_FAIL, "WRITE_FAIL" }, \
79 { XBF_SYNCIO, "SYNCIO" }, \
80 { XBF_FUA, "FUA" }, \
81 { XBF_FLUSH, "FLUSH" }, \
82 { XBF_TRYLOCK, "TRYLOCK" }, \
83 { XBF_UNMAPPED, "UNMAPPED" }, \
84 { _XBF_PAGES, "PAGES" }, \
85 { _XBF_KMEM, "KMEM" }, \
86 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
87 { _XBF_COMPOUND, "COMPOUND" }, \
88 { _XBF_IN_FLIGHT, "IN_FLIGHT" }
89
90
91
92
93
94#define XFS_BSTATE_DISPOSE (1 << 0)
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109typedef struct xfs_buftarg {
110 dev_t bt_dev;
111 struct block_device *bt_bdev;
112 struct backing_dev_info *bt_bdi;
113 struct xfs_mount *bt_mount;
114 unsigned int bt_meta_sectorsize;
115 size_t bt_meta_sectormask;
116 size_t bt_logical_sectorsize;
117 size_t bt_logical_sectormask;
118
119
120 struct shrinker bt_shrinker;
121 struct list_lru bt_lru;
122
123 struct percpu_counter bt_io_count;
124} xfs_buftarg_t;
125
126struct xfs_buf;
127typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
128
129
130#define XB_PAGES 2
131
132struct xfs_buf_map {
133 xfs_daddr_t bm_bn;
134 int bm_len;
135};
136
137#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
138 struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
139
140struct xfs_buf_ops {
141 char *name;
142 void (*verify_read)(struct xfs_buf *);
143 void (*verify_write)(struct xfs_buf *);
144};
145
146typedef struct xfs_buf {
147
148
149
150
151
152
153
154 struct rhash_head b_rhash_head;
155 xfs_daddr_t b_bn;
156 int b_length;
157 atomic_t b_hold;
158 atomic_t b_lru_ref;
159 xfs_buf_flags_t b_flags;
160 struct semaphore b_sema;
161
162
163
164
165
166 struct list_head b_lru;
167 spinlock_t b_lock;
168 unsigned int b_state;
169 int b_io_error;
170 wait_queue_head_t b_waiters;
171 struct list_head b_list;
172 struct xfs_perag *b_pag;
173 xfs_buftarg_t *b_target;
174 void *b_addr;
175 struct work_struct b_ioend_work;
176 struct workqueue_struct *b_ioend_wq;
177 xfs_buf_iodone_t b_iodone;
178 struct completion b_iowait;
179 void *b_fspriv;
180 struct xfs_trans *b_transp;
181 struct page **b_pages;
182 struct page *b_page_array[XB_PAGES];
183 struct xfs_buf_map *b_maps;
184 struct xfs_buf_map __b_map;
185 int b_map_count;
186 int b_io_length;
187 atomic_t b_pin_count;
188 atomic_t b_io_remaining;
189 unsigned int b_page_count;
190 unsigned int b_offset;
191 int b_error;
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208 int b_retries;
209 unsigned long b_first_retry_time;
210 int b_last_error;
211
212 const struct xfs_buf_ops *b_ops;
213
214#ifdef XFS_BUF_LOCK_TRACKING
215 int b_last_holder;
216#endif
217} xfs_buf_t;
218
219
220struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
221 struct xfs_buf_map *map, int nmaps,
222 xfs_buf_flags_t flags, struct xfs_buf *new_bp);
223
224static inline struct xfs_buf *
225xfs_incore(
226 struct xfs_buftarg *target,
227 xfs_daddr_t blkno,
228 size_t numblks,
229 xfs_buf_flags_t flags)
230{
231 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
232 return _xfs_buf_find(target, &map, 1, flags, NULL);
233}
234
235struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
236 struct xfs_buf_map *map, int nmaps,
237 xfs_buf_flags_t flags);
238
239static inline struct xfs_buf *
240xfs_buf_alloc(
241 struct xfs_buftarg *target,
242 xfs_daddr_t blkno,
243 size_t numblks,
244 xfs_buf_flags_t flags)
245{
246 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
247 return _xfs_buf_alloc(target, &map, 1, flags);
248}
249
250struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
251 struct xfs_buf_map *map, int nmaps,
252 xfs_buf_flags_t flags);
253struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
254 struct xfs_buf_map *map, int nmaps,
255 xfs_buf_flags_t flags,
256 const struct xfs_buf_ops *ops);
257void xfs_buf_readahead_map(struct xfs_buftarg *target,
258 struct xfs_buf_map *map, int nmaps,
259 const struct xfs_buf_ops *ops);
260
261static inline struct xfs_buf *
262xfs_buf_get(
263 struct xfs_buftarg *target,
264 xfs_daddr_t blkno,
265 size_t numblks,
266 xfs_buf_flags_t flags)
267{
268 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
269 return xfs_buf_get_map(target, &map, 1, flags);
270}
271
272static inline struct xfs_buf *
273xfs_buf_read(
274 struct xfs_buftarg *target,
275 xfs_daddr_t blkno,
276 size_t numblks,
277 xfs_buf_flags_t flags,
278 const struct xfs_buf_ops *ops)
279{
280 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
281 return xfs_buf_read_map(target, &map, 1, flags, ops);
282}
283
284static inline void
285xfs_buf_readahead(
286 struct xfs_buftarg *target,
287 xfs_daddr_t blkno,
288 size_t numblks,
289 const struct xfs_buf_ops *ops)
290{
291 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
292 return xfs_buf_readahead_map(target, &map, 1, ops);
293}
294
295struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
296void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
297int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
298
299struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
300 int flags);
301int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
302 size_t numblks, int flags, struct xfs_buf **bpp,
303 const struct xfs_buf_ops *ops);
304void xfs_buf_hold(struct xfs_buf *bp);
305
306
307extern void xfs_buf_free(xfs_buf_t *);
308extern void xfs_buf_rele(xfs_buf_t *);
309
310
311extern int xfs_buf_trylock(xfs_buf_t *);
312extern void xfs_buf_lock(xfs_buf_t *);
313extern void xfs_buf_unlock(xfs_buf_t *);
314#define xfs_buf_islocked(bp) \
315 ((bp)->b_sema.count <= 0)
316
317
318extern int xfs_bwrite(struct xfs_buf *bp);
319extern void xfs_buf_ioend(struct xfs_buf *bp);
320extern void xfs_buf_ioerror(xfs_buf_t *, int);
321extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
322extern void xfs_buf_submit(struct xfs_buf *bp);
323extern int xfs_buf_submit_wait(struct xfs_buf *bp);
324extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
325 xfs_buf_rw_t);
326#define xfs_buf_zero(bp, off, len) \
327 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
328
329
330extern void *xfs_buf_offset(struct xfs_buf *, size_t);
331extern void xfs_buf_stale(struct xfs_buf *bp);
332
333
334extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
335extern int xfs_buf_delwri_submit(struct list_head *);
336extern int xfs_buf_delwri_submit_nowait(struct list_head *);
337
338
339extern int xfs_buf_init(void);
340extern void xfs_buf_terminate(void);
341
342
343
344
345
346
347
348
349
350
351
352#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))
354
355static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
356{
357 atomic_set(&bp->b_lru_ref, lru_ref);
358}
359
360static inline int xfs_buf_ispinned(struct xfs_buf *bp)
361{
362 return atomic_read(&bp->b_pin_count);
363}
364
365static inline void xfs_buf_relse(xfs_buf_t *bp)
366{
367 xfs_buf_unlock(bp);
368 xfs_buf_rele(bp);
369}
370
371static 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
378static 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
385
386
387
388extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
389 struct block_device *);
390extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
391extern void xfs_wait_buftarg(xfs_buftarg_t *);
392extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
393
394#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
395#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
396
397#endif
398