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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 <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
32
33
34#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
35
36#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)
40
41typedef enum {
42 XBRW_READ = 1,
43 XBRW_WRITE = 2,
44 XBRW_ZERO = 3,
45} xfs_buf_rw_t;
46
47#define XBF_READ (1 << 0)
48#define XBF_WRITE (1 << 1)
49#define XBF_MAPPED (1 << 2)
50#define XBF_ASYNC (1 << 4)
51#define XBF_DONE (1 << 5)
52#define XBF_DELWRI (1 << 6)
53#define XBF_STALE (1 << 7)
54#define XBF_ORDERED (1 << 11)
55#define XBF_READ_AHEAD (1 << 12)
56#define XBF_LOG_BUFFER (1 << 13)
57
58
59#define XBF_LOCK (1 << 14)
60#define XBF_TRYLOCK (1 << 15)
61#define XBF_DONT_BLOCK (1 << 16)
62
63
64#define _XBF_PAGES (1 << 18)
65#define _XBF_RUN_QUEUES (1 << 19)
66#define _XBF_KMEM (1 << 20)
67#define _XBF_DELWRI_Q (1 << 21)
68
69typedef unsigned int xfs_buf_flags_t;
70
71#define XFS_BUF_FLAGS \
72 { XBF_READ, "READ" }, \
73 { XBF_WRITE, "WRITE" }, \
74 { XBF_MAPPED, "MAPPED" }, \
75 { XBF_ASYNC, "ASYNC" }, \
76 { XBF_DONE, "DONE" }, \
77 { XBF_DELWRI, "DELWRI" }, \
78 { XBF_STALE, "STALE" }, \
79 { XBF_ORDERED, "ORDERED" }, \
80 { XBF_READ_AHEAD, "READ_AHEAD" }, \
81 { XBF_LOCK, "LOCK" }, \
82 { XBF_TRYLOCK, "TRYLOCK" }, \
83 { XBF_DONT_BLOCK, "DONT_BLOCK" }, \
84 { _XBF_PAGES, "PAGES" }, \
85 { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \
86 { _XBF_KMEM, "KMEM" }, \
87 { _XBF_DELWRI_Q, "DELWRI_Q" }
88
89typedef enum {
90 XBT_FORCE_SLEEP = 0,
91 XBT_FORCE_FLUSH = 1,
92} xfs_buftarg_flags_t;
93
94typedef struct xfs_bufhash {
95 struct list_head bh_list;
96 spinlock_t bh_lock;
97} xfs_bufhash_t;
98
99typedef struct xfs_buftarg {
100 dev_t bt_dev;
101 struct block_device *bt_bdev;
102 struct backing_dev_info *bt_bdi;
103 struct xfs_mount *bt_mount;
104 unsigned int bt_bsize;
105 unsigned int bt_sshift;
106 size_t bt_smask;
107
108
109 struct task_struct *bt_task;
110 struct list_head bt_delwrite_queue;
111 spinlock_t bt_delwrite_lock;
112 unsigned long bt_flags;
113
114
115 struct shrinker bt_shrinker;
116 struct list_head bt_lru;
117 spinlock_t bt_lru_lock;
118 unsigned int bt_lru_nr;
119} xfs_buftarg_t;
120
121struct xfs_buf;
122typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
123
124#define XB_PAGES 2
125
126typedef struct xfs_buf {
127
128
129
130
131
132
133
134 struct rb_node b_rbnode;
135 xfs_off_t b_file_offset;
136 size_t b_buffer_length;
137 atomic_t b_hold;
138 atomic_t b_lru_ref;
139 xfs_buf_flags_t b_flags;
140 struct semaphore b_sema;
141
142 struct list_head b_lru;
143 wait_queue_head_t b_waiters;
144 struct list_head b_list;
145 struct xfs_perag *b_pag;
146 xfs_buftarg_t *b_target;
147 xfs_daddr_t b_bn;
148 size_t b_count_desired;
149 void *b_addr;
150 struct work_struct b_iodone_work;
151 xfs_buf_iodone_t b_iodone;
152 struct completion b_iowait;
153 void *b_fspriv;
154 void *b_fspriv2;
155 struct page **b_pages;
156 struct page *b_page_array[XB_PAGES];
157 unsigned long b_queuetime;
158 atomic_t b_pin_count;
159 atomic_t b_io_remaining;
160 unsigned int b_page_count;
161 unsigned int b_offset;
162 unsigned short b_error;
163#ifdef XFS_BUF_LOCK_TRACKING
164 int b_last_holder;
165#endif
166} xfs_buf_t;
167
168
169
170extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
171 xfs_buf_flags_t, xfs_buf_t *);
172#define xfs_incore(buftarg,blkno,len,lockit) \
173 _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
174
175extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t,
176 xfs_buf_flags_t);
177extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
178 xfs_buf_flags_t);
179
180extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
181extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);
182extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
183extern void xfs_buf_hold(xfs_buf_t *);
184extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t);
185struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp,
186 struct xfs_buftarg *target,
187 xfs_daddr_t daddr, size_t length, int flags);
188
189
190extern void xfs_buf_free(xfs_buf_t *);
191extern void xfs_buf_rele(xfs_buf_t *);
192
193
194extern int xfs_buf_cond_lock(xfs_buf_t *);
195extern int xfs_buf_lock_value(xfs_buf_t *);
196extern void xfs_buf_lock(xfs_buf_t *);
197extern void xfs_buf_unlock(xfs_buf_t *);
198
199
200extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
201extern void xfs_bdwrite(void *mp, xfs_buf_t *bp);
202
203extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
204extern int xfs_bdstrat_cb(struct xfs_buf *);
205
206extern void xfs_buf_ioend(xfs_buf_t *, int);
207extern void xfs_buf_ioerror(xfs_buf_t *, int);
208extern int xfs_buf_iorequest(xfs_buf_t *);
209extern int xfs_buf_iowait(xfs_buf_t *);
210extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
211 xfs_buf_rw_t);
212#define xfs_buf_zero(bp, off, len) \
213 xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
214
215static inline int xfs_buf_geterror(xfs_buf_t *bp)
216{
217 return bp ? bp->b_error : ENOMEM;
218}
219
220
221extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
222
223
224extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
225extern void xfs_buf_delwri_promote(xfs_buf_t *);
226
227
228extern int xfs_buf_init(void);
229extern void xfs_buf_terminate(void);
230
231#define xfs_buf_target_name(target) \
232 ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
233
234
235#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags)
236#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \
237 ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED))
238
239void xfs_buf_stale(struct xfs_buf *bp);
240#define XFS_BUF_STALE(bp) xfs_buf_stale(bp);
241#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE)
242#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE)
243#define XFS_BUF_SUPER_STALE(bp) do { \
244 XFS_BUF_STALE(bp); \
245 xfs_buf_delwri_dequeue(bp); \
246 XFS_BUF_DONE(bp); \
247 } while (0)
248
249#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI)
250#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp)
251#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI)
252
253#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no)
254#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp)
255#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0)
256
257#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE)
258#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE)
259#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE)
260
261#define XFS_BUF_BUSY(bp) do { } while (0)
262#define XFS_BUF_UNBUSY(bp) do { } while (0)
263#define XFS_BUF_ISBUSY(bp) (1)
264
265#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC)
266#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC)
267#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC)
268
269#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED)
270#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED)
271#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED)
272
273#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp)
274#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ)
275#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ)
276#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ)
277
278#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE)
279#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE)
280#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE)
281
282#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
283#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
284#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
285
286#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
287#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))
288#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2)
289#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val))
290#define XFS_BUF_SET_START(bp) do { } while (0)
291
292#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr)
293#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt)
294#define XFS_BUF_ADDR(bp) ((bp)->b_bn)
295#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno))
296#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset)
297#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off))
298#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired)
299#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt))
300#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length)
301#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt))
302
303static inline void
304xfs_buf_set_ref(
305 struct xfs_buf *bp,
306 int lru_ref)
307{
308 atomic_set(&bp->b_lru_ref, lru_ref);
309}
310#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) xfs_buf_set_ref(bp, ref)
311#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0)
312
313#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count))
314
315#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp)
316#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0)
317#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp)
318#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp)
319#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait);
320
321#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target))
322#define XFS_BUF_TARGET(bp) ((bp)->b_target)
323#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target)
324
325static inline void xfs_buf_relse(xfs_buf_t *bp)
326{
327 xfs_buf_unlock(bp);
328 xfs_buf_rele(bp);
329}
330
331
332
333
334extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *,
335 struct block_device *, int, const char *);
336extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *);
337extern void xfs_wait_buftarg(xfs_buftarg_t *);
338extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
339extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
340
341#ifdef CONFIG_KDB_MODULES
342extern struct list_head *xfs_get_buftarg_list(void);
343#endif
344
345#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev)
346#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev)
347
348#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1)
349#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1)
350
351#endif
352