Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * 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. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * 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 | |
1da177e4 | 17 | */ |
1da177e4 LT |
18 | #ifndef __XFS_BUF_H__ |
19 | #define __XFS_BUF_H__ | |
20 | ||
1da177e4 LT |
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 | * Base types | |
32 | */ | |
33 | ||
ce8e922c NS |
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 | ||
41 | typedef enum { | |
42 | XBRW_READ = 1, /* transfer into target memory */ | |
43 | XBRW_WRITE = 2, /* transfer from target memory */ | |
44 | XBRW_ZERO = 3, /* Zero target memory */ | |
45 | } xfs_buf_rw_t; | |
46 | ||
807cbbdb CH |
47 | #define XBF_READ (1 << 0) /* buffer intended for reading from device */ |
48 | #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ | |
1d5ae5df CH |
49 | #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ |
50 | #define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */ | |
807cbbdb CH |
51 | #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ |
52 | #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ | |
53 | #define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ | |
54 | #define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ | |
1d5ae5df CH |
55 | |
56 | /* I/O hints for the BIO layer */ | |
57 | #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ | |
58 | #define XBF_FUA (1 << 11)/* force cache write through mode */ | |
59 | #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ | |
1da177e4 | 60 | |
807cbbdb | 61 | /* flags used only as arguments to access routines */ |
1d5ae5df CH |
62 | #define XBF_LOCK (1 << 15)/* lock requested */ |
63 | #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ | |
64 | #define XBF_DONT_BLOCK (1 << 17)/* do not block in current thread */ | |
1da177e4 | 65 | |
807cbbdb | 66 | /* flags used only internally */ |
1d5ae5df CH |
67 | #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ |
68 | #define _XBF_KMEM (1 << 21)/* backed by heap memory */ | |
69 | #define _XBF_DELWRI_Q (1 << 22)/* buffer on delwri queue */ | |
6ab455ee | 70 | |
807cbbdb | 71 | typedef unsigned int xfs_buf_flags_t; |
1da177e4 | 72 | |
0b1b213f CH |
73 | #define XFS_BUF_FLAGS \ |
74 | { XBF_READ, "READ" }, \ | |
75 | { XBF_WRITE, "WRITE" }, \ | |
1d5ae5df | 76 | { XBF_READ_AHEAD, "READ_AHEAD" }, \ |
0b1b213f CH |
77 | { XBF_MAPPED, "MAPPED" }, \ |
78 | { XBF_ASYNC, "ASYNC" }, \ | |
79 | { XBF_DONE, "DONE" }, \ | |
80 | { XBF_DELWRI, "DELWRI" }, \ | |
81 | { XBF_STALE, "STALE" }, \ | |
1d5ae5df CH |
82 | { XBF_SYNCIO, "SYNCIO" }, \ |
83 | { XBF_FUA, "FUA" }, \ | |
84 | { XBF_FLUSH, "FLUSH" }, \ | |
0b1b213f CH |
85 | { XBF_LOCK, "LOCK" }, /* should never be set */\ |
86 | { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ | |
87 | { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ | |
0b1b213f | 88 | { _XBF_PAGES, "PAGES" }, \ |
0e6e847f DC |
89 | { _XBF_KMEM, "KMEM" }, \ |
90 | { _XBF_DELWRI_Q, "DELWRI_Q" } | |
0b1b213f | 91 | |
ce8e922c | 92 | typedef enum { |
687d1c5e | 93 | XBT_FORCE_FLUSH = 0, |
ce8e922c | 94 | } xfs_buftarg_flags_t; |
1da177e4 | 95 | |
1da177e4 | 96 | typedef struct xfs_buftarg { |
ce8e922c NS |
97 | dev_t bt_dev; |
98 | struct block_device *bt_bdev; | |
0e6e847f | 99 | struct backing_dev_info *bt_bdi; |
ebad861b | 100 | struct xfs_mount *bt_mount; |
ce8e922c NS |
101 | unsigned int bt_bsize; |
102 | unsigned int bt_sshift; | |
103 | size_t bt_smask; | |
104 | ||
a6867a68 DC |
105 | /* per device delwri queue */ |
106 | struct task_struct *bt_task; | |
c4e1c098 CH |
107 | struct list_head bt_delwri_queue; |
108 | spinlock_t bt_delwri_lock; | |
ce8e922c | 109 | unsigned long bt_flags; |
ff57ab21 DC |
110 | |
111 | /* LRU control structures */ | |
112 | struct shrinker bt_shrinker; | |
430cbeb8 DC |
113 | struct list_head bt_lru; |
114 | spinlock_t bt_lru_lock; | |
115 | unsigned int bt_lru_nr; | |
1da177e4 LT |
116 | } xfs_buftarg_t; |
117 | ||
1da177e4 | 118 | struct xfs_buf; |
ce8e922c | 119 | typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); |
1da177e4 | 120 | |
ce8e922c | 121 | #define XB_PAGES 2 |
1da177e4 LT |
122 | |
123 | typedef struct xfs_buf { | |
50f59e8e DC |
124 | /* |
125 | * first cacheline holds all the fields needed for an uncontended cache | |
126 | * hit to be fully processed. The semaphore straddles the cacheline | |
127 | * boundary, but the counter and lock sits on the first cacheline, | |
128 | * which is the only bit that is touched if we hit the semaphore | |
129 | * fast-path on locking. | |
130 | */ | |
131 | struct rb_node b_rbnode; /* rbtree node */ | |
132 | xfs_off_t b_file_offset; /* offset in file */ | |
133 | size_t b_buffer_length;/* size of buffer in bytes */ | |
134 | atomic_t b_hold; /* reference count */ | |
430cbeb8 | 135 | atomic_t b_lru_ref; /* lru reclaim ref count */ |
50f59e8e | 136 | xfs_buf_flags_t b_flags; /* status flags */ |
ce8e922c | 137 | struct semaphore b_sema; /* semaphore for lockables */ |
50f59e8e | 138 | |
430cbeb8 | 139 | struct list_head b_lru; /* lru list */ |
ce8e922c NS |
140 | wait_queue_head_t b_waiters; /* unpin waiters */ |
141 | struct list_head b_list; | |
74f75a0c | 142 | struct xfs_perag *b_pag; /* contains rbtree root */ |
ce8e922c | 143 | xfs_buftarg_t *b_target; /* buffer target (device) */ |
ce8e922c | 144 | xfs_daddr_t b_bn; /* block number for I/O */ |
ce8e922c NS |
145 | size_t b_count_desired;/* desired transfer size */ |
146 | void *b_addr; /* virtual address of buffer */ | |
147 | struct work_struct b_iodone_work; | |
ce8e922c | 148 | xfs_buf_iodone_t b_iodone; /* I/O completion function */ |
b4dd330b | 149 | struct completion b_iowait; /* queue for I/O waiters */ |
ce8e922c | 150 | void *b_fspriv; |
bf9d9013 | 151 | struct xfs_trans *b_transp; |
ce8e922c NS |
152 | struct page **b_pages; /* array of page pointers */ |
153 | struct page *b_page_array[XB_PAGES]; /* inline pages */ | |
50f59e8e DC |
154 | unsigned long b_queuetime; /* time buffer was queued */ |
155 | atomic_t b_pin_count; /* pin count */ | |
156 | atomic_t b_io_remaining; /* #outstanding I/O requests */ | |
157 | unsigned int b_page_count; /* size of page array */ | |
158 | unsigned int b_offset; /* page offset in first page */ | |
159 | unsigned short b_error; /* error code on I/O */ | |
ce8e922c NS |
160 | #ifdef XFS_BUF_LOCK_TRACKING |
161 | int b_last_holder; | |
1da177e4 LT |
162 | #endif |
163 | } xfs_buf_t; | |
164 | ||
165 | ||
166 | /* Finding and Reading Buffers */ | |
ce8e922c NS |
167 | extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, |
168 | xfs_buf_flags_t, xfs_buf_t *); | |
1da177e4 | 169 | #define xfs_incore(buftarg,blkno,len,lockit) \ |
ce8e922c | 170 | _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) |
1da177e4 | 171 | |
6ad112bf | 172 | extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 173 | xfs_buf_flags_t); |
6ad112bf | 174 | extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 175 | xfs_buf_flags_t); |
1da177e4 | 176 | |
4347b9d7 CH |
177 | struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *, xfs_off_t, size_t, |
178 | xfs_buf_flags_t); | |
44396476 | 179 | extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len); |
686865f7 | 180 | extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); |
ce8e922c NS |
181 | extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); |
182 | extern void xfs_buf_hold(xfs_buf_t *); | |
1a1a3e97 | 183 | extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t); |
5adc94c2 DC |
184 | struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, |
185 | struct xfs_buftarg *target, | |
186 | xfs_daddr_t daddr, size_t length, int flags); | |
1da177e4 LT |
187 | |
188 | /* Releasing Buffers */ | |
ce8e922c NS |
189 | extern void xfs_buf_free(xfs_buf_t *); |
190 | extern void xfs_buf_rele(xfs_buf_t *); | |
1da177e4 LT |
191 | |
192 | /* Locking and Unlocking Buffers */ | |
0c842ad4 | 193 | extern int xfs_buf_trylock(xfs_buf_t *); |
ce8e922c NS |
194 | extern void xfs_buf_lock(xfs_buf_t *); |
195 | extern void xfs_buf_unlock(xfs_buf_t *); | |
0c842ad4 CH |
196 | #define xfs_buf_islocked(bp) \ |
197 | ((bp)->b_sema.count <= 0) | |
1da177e4 LT |
198 | |
199 | /* Buffer Read and Write Routines */ | |
c2b006c1 | 200 | extern int xfs_bwrite(struct xfs_buf *bp); |
4e23471a CH |
201 | |
202 | extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); | |
203 | extern int xfs_bdstrat_cb(struct xfs_buf *); | |
204 | ||
ce8e922c NS |
205 | extern void xfs_buf_ioend(xfs_buf_t *, int); |
206 | extern void xfs_buf_ioerror(xfs_buf_t *, int); | |
901796af | 207 | extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); |
ce8e922c NS |
208 | extern int xfs_buf_iorequest(xfs_buf_t *); |
209 | extern int xfs_buf_iowait(xfs_buf_t *); | |
b9c48649 | 210 | extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, |
ce8e922c | 211 | xfs_buf_rw_t); |
1a1a3e97 CH |
212 | #define xfs_buf_zero(bp, off, len) \ |
213 | xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) | |
ce8e922c | 214 | |
ce8e922c | 215 | static inline int xfs_buf_geterror(xfs_buf_t *bp) |
1da177e4 | 216 | { |
ce8e922c | 217 | return bp ? bp->b_error : ENOMEM; |
1da177e4 LT |
218 | } |
219 | ||
220 | /* Buffer Utility Routines */ | |
ce8e922c | 221 | extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); |
1da177e4 | 222 | |
1da177e4 | 223 | /* Delayed Write Buffer Routines */ |
61551f1e CH |
224 | extern void xfs_buf_delwri_queue(struct xfs_buf *); |
225 | extern void xfs_buf_delwri_dequeue(struct xfs_buf *); | |
226 | extern void xfs_buf_delwri_promote(struct xfs_buf *); | |
1da177e4 LT |
227 | |
228 | /* Buffer Daemon Setup Routines */ | |
ce8e922c NS |
229 | extern int xfs_buf_init(void); |
230 | extern void xfs_buf_terminate(void); | |
1da177e4 | 231 | |
1d5ae5df CH |
232 | #define XFS_BUF_ZEROFLAGS(bp) \ |
233 | ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI| \ | |
234 | XBF_SYNCIO|XBF_FUA|XBF_FLUSH)) | |
ce8e922c | 235 | |
430cbeb8 | 236 | void xfs_buf_stale(struct xfs_buf *bp); |
0cadda1c CH |
237 | #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) |
238 | #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) | |
1da177e4 | 239 | |
ce8e922c NS |
240 | #define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI) |
241 | ||
ce8e922c NS |
242 | #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) |
243 | #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) | |
244 | #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) | |
245 | ||
ce8e922c NS |
246 | #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) |
247 | #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) | |
248 | #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) | |
249 | ||
ce8e922c NS |
250 | #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) |
251 | #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) | |
252 | #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) | |
253 | ||
254 | #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) | |
255 | #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) | |
256 | #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) | |
257 | ||
ce8e922c NS |
258 | #define XFS_BUF_ADDR(bp) ((bp)->b_bn) |
259 | #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) | |
260 | #define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) | |
261 | #define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) | |
262 | #define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) | |
263 | #define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) | |
264 | #define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) | |
265 | #define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) | |
266 | ||
38f23232 | 267 | static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) |
821eb21d DC |
268 | { |
269 | atomic_set(&bp->b_lru_ref, lru_ref); | |
270 | } | |
ce8e922c | 271 | |
811e64c7 CS |
272 | static inline int xfs_buf_ispinned(struct xfs_buf *bp) |
273 | { | |
274 | return atomic_read(&bp->b_pin_count); | |
275 | } | |
ce8e922c | 276 | |
ce8e922c | 277 | static inline void xfs_buf_relse(xfs_buf_t *bp) |
1da177e4 | 278 | { |
bfc60177 | 279 | xfs_buf_unlock(bp); |
ce8e922c | 280 | xfs_buf_rele(bp); |
1da177e4 LT |
281 | } |
282 | ||
1da177e4 LT |
283 | /* |
284 | * Handling of buftargs. | |
285 | */ | |
ebad861b DC |
286 | extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
287 | struct block_device *, int, const char *); | |
c141b292 | 288 | extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); |
1da177e4 LT |
289 | extern void xfs_wait_buftarg(xfs_buftarg_t *); |
290 | extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); | |
1da177e4 | 291 | extern int xfs_flush_buftarg(xfs_buftarg_t *, int); |
d808f617 | 292 | |
ce8e922c NS |
293 | #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
294 | #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) | |
295 | ||
1da177e4 | 296 | #endif /* __XFS_BUF_H__ */ |