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6#ifndef __XFS_BUF_H__
7#define __XFS_BUF_H__
8
9#include <linux/list.h>
10#include <linux/types.h>
11#include <linux/spinlock.h>
12#include <linux/mm.h>
13#include <linux/fs.h>
14#include <linux/dax.h>
15#include <linux/uio.h>
16#include <linux/list_lru.h>
17
18
19
20
21struct xfs_buf;
22
23#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
24
25#define XBF_READ (1 << 0)
26#define XBF_WRITE (1 << 1)
27#define XBF_READ_AHEAD (1 << 2)
28#define XBF_NO_IOACCT (1 << 3)
29#define XBF_ASYNC (1 << 4)
30#define XBF_DONE (1 << 5)
31#define XBF_STALE (1 << 6)
32#define XBF_WRITE_FAIL (1 << 7)
33
34
35#define _XBF_INODES (1 << 16)
36#define _XBF_DQUOTS (1 << 17)
37#define _XBF_LOGRECOVERY (1 << 18)
38
39
40#define _XBF_PAGES (1 << 20)
41#define _XBF_KMEM (1 << 21)
42#define _XBF_DELWRI_Q (1 << 22)
43
44
45#define XBF_TRYLOCK (1 << 30)
46#define XBF_UNMAPPED (1 << 31)
47
48typedef unsigned int xfs_buf_flags_t;
49
50#define XFS_BUF_FLAGS \
51 { XBF_READ, "READ" }, \
52 { XBF_WRITE, "WRITE" }, \
53 { XBF_READ_AHEAD, "READ_AHEAD" }, \
54 { XBF_NO_IOACCT, "NO_IOACCT" }, \
55 { XBF_ASYNC, "ASYNC" }, \
56 { XBF_DONE, "DONE" }, \
57 { XBF_STALE, "STALE" }, \
58 { XBF_WRITE_FAIL, "WRITE_FAIL" }, \
59 { _XBF_INODES, "INODES" }, \
60 { _XBF_DQUOTS, "DQUOTS" }, \
61 { _XBF_LOGRECOVERY, "LOG_RECOVERY" }, \
62 { _XBF_PAGES, "PAGES" }, \
63 { _XBF_KMEM, "KMEM" }, \
64 { _XBF_DELWRI_Q, "DELWRI_Q" }, \
65 \
66 { XBF_TRYLOCK, "TRYLOCK" }, \
67 { XBF_UNMAPPED, "UNMAPPED" }
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71
72#define XFS_BSTATE_DISPOSE (1 << 0)
73#define XFS_BSTATE_IN_FLIGHT (1 << 1)
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87
88typedef struct xfs_buftarg {
89 dev_t bt_dev;
90 struct block_device *bt_bdev;
91 struct dax_device *bt_daxdev;
92 struct xfs_mount *bt_mount;
93 unsigned int bt_meta_sectorsize;
94 size_t bt_meta_sectormask;
95 size_t bt_logical_sectorsize;
96 size_t bt_logical_sectormask;
97
98
99 struct shrinker bt_shrinker;
100 struct list_lru bt_lru;
101
102 struct percpu_counter bt_io_count;
103 struct ratelimit_state bt_ioerror_rl;
104} xfs_buftarg_t;
105
106#define XB_PAGES 2
107
108struct xfs_buf_map {
109 xfs_daddr_t bm_bn;
110 int bm_len;
111};
112
113#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
114 struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
115
116struct xfs_buf_ops {
117 char *name;
118 union {
119 __be32 magic[2];
120 __be16 magic16[2];
121 };
122 void (*verify_read)(struct xfs_buf *);
123 void (*verify_write)(struct xfs_buf *);
124 xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp);
125};
126
127typedef struct xfs_buf {
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134
135 struct rhash_head b_rhash_head;
136 xfs_daddr_t b_bn;
137 int b_length;
138 atomic_t b_hold;
139 atomic_t b_lru_ref;
140 xfs_buf_flags_t b_flags;
141 struct semaphore b_sema;
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146
147 struct list_head b_lru;
148 spinlock_t b_lock;
149 unsigned int b_state;
150 int b_io_error;
151 wait_queue_head_t b_waiters;
152 struct list_head b_list;
153 struct xfs_perag *b_pag;
154 struct xfs_mount *b_mount;
155 xfs_buftarg_t *b_target;
156 void *b_addr;
157 struct work_struct b_ioend_work;
158 struct completion b_iowait;
159 struct xfs_buf_log_item *b_log_item;
160 struct list_head b_li_list;
161 struct xfs_trans *b_transp;
162 struct page **b_pages;
163 struct page *b_page_array[XB_PAGES];
164 struct xfs_buf_map *b_maps;
165 struct xfs_buf_map __b_map;
166 int b_map_count;
167 atomic_t b_pin_count;
168 atomic_t b_io_remaining;
169 unsigned int b_page_count;
170 unsigned int b_offset;
171 int b_error;
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187
188 int b_retries;
189 unsigned long b_first_retry_time;
190 int b_last_error;
191
192 const struct xfs_buf_ops *b_ops;
193} xfs_buf_t;
194
195
196struct xfs_buf *xfs_buf_incore(struct xfs_buftarg *target,
197 xfs_daddr_t blkno, size_t numblks,
198 xfs_buf_flags_t flags);
199
200int xfs_buf_get_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
201 int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp);
202int xfs_buf_read_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
203 int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp,
204 const struct xfs_buf_ops *ops, xfs_failaddr_t fa);
205void xfs_buf_readahead_map(struct xfs_buftarg *target,
206 struct xfs_buf_map *map, int nmaps,
207 const struct xfs_buf_ops *ops);
208
209static inline int
210xfs_buf_get(
211 struct xfs_buftarg *target,
212 xfs_daddr_t blkno,
213 size_t numblks,
214 struct xfs_buf **bpp)
215{
216 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
217
218 return xfs_buf_get_map(target, &map, 1, 0, bpp);
219}
220
221static inline int
222xfs_buf_read(
223 struct xfs_buftarg *target,
224 xfs_daddr_t blkno,
225 size_t numblks,
226 xfs_buf_flags_t flags,
227 struct xfs_buf **bpp,
228 const struct xfs_buf_ops *ops)
229{
230 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
231
232 return xfs_buf_read_map(target, &map, 1, flags, bpp, ops,
233 __builtin_return_address(0));
234}
235
236static inline void
237xfs_buf_readahead(
238 struct xfs_buftarg *target,
239 xfs_daddr_t blkno,
240 size_t numblks,
241 const struct xfs_buf_ops *ops)
242{
243 DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
244 return xfs_buf_readahead_map(target, &map, 1, ops);
245}
246
247int xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, int flags,
248 struct xfs_buf **bpp);
249int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
250 size_t numblks, int flags, struct xfs_buf **bpp,
251 const struct xfs_buf_ops *ops);
252int _xfs_buf_read(struct xfs_buf *bp, xfs_buf_flags_t flags);
253void xfs_buf_hold(struct xfs_buf *bp);
254
255
256extern void xfs_buf_rele(xfs_buf_t *);
257
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259extern int xfs_buf_trylock(xfs_buf_t *);
260extern void xfs_buf_lock(xfs_buf_t *);
261extern void xfs_buf_unlock(xfs_buf_t *);
262#define xfs_buf_islocked(bp) \
263 ((bp)->b_sema.count <= 0)
264
265static inline void xfs_buf_relse(xfs_buf_t *bp)
266{
267 xfs_buf_unlock(bp);
268 xfs_buf_rele(bp);
269}
270
271
272extern int xfs_bwrite(struct xfs_buf *bp);
273
274extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error,
275 xfs_failaddr_t failaddr);
276#define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address)
277extern void xfs_buf_ioerror_alert(struct xfs_buf *bp, xfs_failaddr_t fa);
278void xfs_buf_ioend_fail(struct xfs_buf *);
279void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize);
280void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa);
281#define xfs_buf_mark_corrupt(bp) __xfs_buf_mark_corrupt((bp), __this_address)
282
283
284extern void *xfs_buf_offset(struct xfs_buf *, size_t);
285extern void xfs_buf_stale(struct xfs_buf *bp);
286
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288extern void xfs_buf_delwri_cancel(struct list_head *);
289extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
290extern int xfs_buf_delwri_submit(struct list_head *);
291extern int xfs_buf_delwri_submit_nowait(struct list_head *);
292extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *);
293
294
295extern int xfs_buf_init(void);
296extern void xfs_buf_terminate(void);
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308#define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn)
309#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno))
310
311void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref);
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318static inline void xfs_buf_oneshot(struct xfs_buf *bp)
319{
320 if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1)
321 return;
322 atomic_set(&bp->b_lru_ref, 0);
323}
324
325static inline int xfs_buf_ispinned(struct xfs_buf *bp)
326{
327 return atomic_read(&bp->b_pin_count);
328}
329
330static inline int
331xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
332{
333 return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
334 cksum_offset);
335}
336
337static inline void
338xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
339{
340 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
341 cksum_offset);
342}
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346
347extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
348 struct block_device *, struct dax_device *);
349extern void xfs_free_buftarg(struct xfs_buftarg *);
350extern void xfs_wait_buftarg(xfs_buftarg_t *);
351extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int);
352
353#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
354#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
355
356static inline int
357xfs_buftarg_dma_alignment(struct xfs_buftarg *bt)
358{
359 return queue_dma_alignment(bt->bt_bdev->bd_disk->queue);
360}
361
362int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops);
363bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic);
364bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic);
365
366#endif
367