]>
Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
24 | #include <linux/mm.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/buffer_head.h> | |
27 | #include <linux/uio.h> | |
28 | ||
29 | /* | |
30 | * Base types | |
31 | */ | |
32 | ||
ce8e922c NS |
33 | #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) |
34 | ||
35 | #define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE) | |
36 | #define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) | |
37 | #define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT) | |
38 | #define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK) | |
39 | ||
40 | typedef enum { | |
41 | XBRW_READ = 1, /* transfer into target memory */ | |
42 | XBRW_WRITE = 2, /* transfer from target memory */ | |
43 | XBRW_ZERO = 3, /* Zero target memory */ | |
44 | } xfs_buf_rw_t; | |
45 | ||
807cbbdb CH |
46 | #define XBF_READ (1 << 0) /* buffer intended for reading from device */ |
47 | #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ | |
1d5ae5df CH |
48 | #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ |
49 | #define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */ | |
807cbbdb CH |
50 | #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ |
51 | #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ | |
43ff2122 | 52 | #define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ |
1d5ae5df CH |
53 | |
54 | /* I/O hints for the BIO layer */ | |
55 | #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ | |
56 | #define XBF_FUA (1 << 11)/* force cache write through mode */ | |
57 | #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ | |
1da177e4 | 58 | |
807cbbdb | 59 | /* flags used only as arguments to access routines */ |
1d5ae5df CH |
60 | #define XBF_LOCK (1 << 15)/* lock requested */ |
61 | #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ | |
62 | #define XBF_DONT_BLOCK (1 << 17)/* do not block in current thread */ | |
1da177e4 | 63 | |
807cbbdb | 64 | /* flags used only internally */ |
1d5ae5df CH |
65 | #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ |
66 | #define _XBF_KMEM (1 << 21)/* backed by heap memory */ | |
43ff2122 | 67 | #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ |
6ab455ee | 68 | |
807cbbdb | 69 | typedef unsigned int xfs_buf_flags_t; |
1da177e4 | 70 | |
0b1b213f CH |
71 | #define XFS_BUF_FLAGS \ |
72 | { XBF_READ, "READ" }, \ | |
73 | { XBF_WRITE, "WRITE" }, \ | |
1d5ae5df | 74 | { XBF_READ_AHEAD, "READ_AHEAD" }, \ |
0b1b213f CH |
75 | { XBF_MAPPED, "MAPPED" }, \ |
76 | { XBF_ASYNC, "ASYNC" }, \ | |
77 | { XBF_DONE, "DONE" }, \ | |
0b1b213f | 78 | { XBF_STALE, "STALE" }, \ |
1d5ae5df CH |
79 | { XBF_SYNCIO, "SYNCIO" }, \ |
80 | { XBF_FUA, "FUA" }, \ | |
81 | { XBF_FLUSH, "FLUSH" }, \ | |
0b1b213f CH |
82 | { XBF_LOCK, "LOCK" }, /* should never be set */\ |
83 | { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ | |
84 | { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ | |
0b1b213f | 85 | { _XBF_PAGES, "PAGES" }, \ |
0e6e847f DC |
86 | { _XBF_KMEM, "KMEM" }, \ |
87 | { _XBF_DELWRI_Q, "DELWRI_Q" } | |
0b1b213f | 88 | |
1da177e4 | 89 | typedef struct xfs_buftarg { |
ce8e922c NS |
90 | dev_t bt_dev; |
91 | struct block_device *bt_bdev; | |
0e6e847f | 92 | struct backing_dev_info *bt_bdi; |
ebad861b | 93 | struct xfs_mount *bt_mount; |
ce8e922c NS |
94 | unsigned int bt_bsize; |
95 | unsigned int bt_sshift; | |
96 | size_t bt_smask; | |
97 | ||
ff57ab21 DC |
98 | /* LRU control structures */ |
99 | struct shrinker bt_shrinker; | |
430cbeb8 DC |
100 | struct list_head bt_lru; |
101 | spinlock_t bt_lru_lock; | |
102 | unsigned int bt_lru_nr; | |
1da177e4 LT |
103 | } xfs_buftarg_t; |
104 | ||
1da177e4 | 105 | struct xfs_buf; |
ce8e922c | 106 | typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); |
1da177e4 | 107 | |
ce8e922c | 108 | #define XB_PAGES 2 |
1da177e4 LT |
109 | |
110 | typedef struct xfs_buf { | |
50f59e8e DC |
111 | /* |
112 | * first cacheline holds all the fields needed for an uncontended cache | |
113 | * hit to be fully processed. The semaphore straddles the cacheline | |
114 | * boundary, but the counter and lock sits on the first cacheline, | |
115 | * which is the only bit that is touched if we hit the semaphore | |
116 | * fast-path on locking. | |
117 | */ | |
118 | struct rb_node b_rbnode; /* rbtree node */ | |
119 | xfs_off_t b_file_offset; /* offset in file */ | |
120 | size_t b_buffer_length;/* size of buffer in bytes */ | |
121 | atomic_t b_hold; /* reference count */ | |
430cbeb8 | 122 | atomic_t b_lru_ref; /* lru reclaim ref count */ |
50f59e8e | 123 | xfs_buf_flags_t b_flags; /* status flags */ |
ce8e922c | 124 | struct semaphore b_sema; /* semaphore for lockables */ |
50f59e8e | 125 | |
430cbeb8 | 126 | struct list_head b_lru; /* lru list */ |
ce8e922c NS |
127 | wait_queue_head_t b_waiters; /* unpin waiters */ |
128 | struct list_head b_list; | |
74f75a0c | 129 | struct xfs_perag *b_pag; /* contains rbtree root */ |
ce8e922c | 130 | xfs_buftarg_t *b_target; /* buffer target (device) */ |
ce8e922c | 131 | xfs_daddr_t b_bn; /* block number for I/O */ |
ce8e922c NS |
132 | size_t b_count_desired;/* desired transfer size */ |
133 | void *b_addr; /* virtual address of buffer */ | |
134 | struct work_struct b_iodone_work; | |
ce8e922c | 135 | xfs_buf_iodone_t b_iodone; /* I/O completion function */ |
b4dd330b | 136 | struct completion b_iowait; /* queue for I/O waiters */ |
ce8e922c | 137 | void *b_fspriv; |
bf9d9013 | 138 | struct xfs_trans *b_transp; |
ce8e922c NS |
139 | struct page **b_pages; /* array of page pointers */ |
140 | struct page *b_page_array[XB_PAGES]; /* inline pages */ | |
50f59e8e DC |
141 | atomic_t b_pin_count; /* pin count */ |
142 | atomic_t b_io_remaining; /* #outstanding I/O requests */ | |
143 | unsigned int b_page_count; /* size of page array */ | |
144 | unsigned int b_offset; /* page offset in first page */ | |
145 | unsigned short b_error; /* error code on I/O */ | |
ce8e922c NS |
146 | #ifdef XFS_BUF_LOCK_TRACKING |
147 | int b_last_holder; | |
1da177e4 LT |
148 | #endif |
149 | } xfs_buf_t; | |
150 | ||
151 | ||
152 | /* Finding and Reading Buffers */ | |
ce8e922c NS |
153 | extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, |
154 | xfs_buf_flags_t, xfs_buf_t *); | |
1da177e4 | 155 | #define xfs_incore(buftarg,blkno,len,lockit) \ |
ce8e922c | 156 | _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) |
1da177e4 | 157 | |
6ad112bf | 158 | extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 159 | xfs_buf_flags_t); |
6ad112bf | 160 | extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 161 | xfs_buf_flags_t); |
1da177e4 | 162 | |
4347b9d7 CH |
163 | struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *, xfs_off_t, size_t, |
164 | xfs_buf_flags_t); | |
44396476 | 165 | extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len); |
686865f7 | 166 | extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); |
ce8e922c NS |
167 | extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); |
168 | extern void xfs_buf_hold(xfs_buf_t *); | |
1a1a3e97 | 169 | extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t); |
5adc94c2 DC |
170 | struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, |
171 | struct xfs_buftarg *target, | |
172 | xfs_daddr_t daddr, size_t length, int flags); | |
1da177e4 LT |
173 | |
174 | /* Releasing Buffers */ | |
ce8e922c NS |
175 | extern void xfs_buf_free(xfs_buf_t *); |
176 | extern void xfs_buf_rele(xfs_buf_t *); | |
1da177e4 LT |
177 | |
178 | /* Locking and Unlocking Buffers */ | |
0c842ad4 | 179 | extern int xfs_buf_trylock(xfs_buf_t *); |
ce8e922c NS |
180 | extern void xfs_buf_lock(xfs_buf_t *); |
181 | extern void xfs_buf_unlock(xfs_buf_t *); | |
0c842ad4 CH |
182 | #define xfs_buf_islocked(bp) \ |
183 | ((bp)->b_sema.count <= 0) | |
1da177e4 LT |
184 | |
185 | /* Buffer Read and Write Routines */ | |
c2b006c1 | 186 | extern int xfs_bwrite(struct xfs_buf *bp); |
4e23471a CH |
187 | |
188 | extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); | |
189 | extern int xfs_bdstrat_cb(struct xfs_buf *); | |
190 | ||
ce8e922c NS |
191 | extern void xfs_buf_ioend(xfs_buf_t *, int); |
192 | extern void xfs_buf_ioerror(xfs_buf_t *, int); | |
901796af | 193 | extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); |
ce8e922c NS |
194 | extern int xfs_buf_iorequest(xfs_buf_t *); |
195 | extern int xfs_buf_iowait(xfs_buf_t *); | |
b9c48649 | 196 | extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, |
ce8e922c | 197 | xfs_buf_rw_t); |
1a1a3e97 CH |
198 | #define xfs_buf_zero(bp, off, len) \ |
199 | xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) | |
ce8e922c | 200 | |
ce8e922c | 201 | static inline int xfs_buf_geterror(xfs_buf_t *bp) |
1da177e4 | 202 | { |
ce8e922c | 203 | return bp ? bp->b_error : ENOMEM; |
1da177e4 LT |
204 | } |
205 | ||
206 | /* Buffer Utility Routines */ | |
ce8e922c | 207 | extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); |
1da177e4 | 208 | |
1da177e4 | 209 | /* Delayed Write Buffer Routines */ |
43ff2122 CH |
210 | extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); |
211 | extern int xfs_buf_delwri_submit(struct list_head *); | |
212 | extern int xfs_buf_delwri_submit_nowait(struct list_head *); | |
1da177e4 LT |
213 | |
214 | /* Buffer Daemon Setup Routines */ | |
ce8e922c NS |
215 | extern int xfs_buf_init(void); |
216 | extern void xfs_buf_terminate(void); | |
1da177e4 | 217 | |
1d5ae5df | 218 | #define XFS_BUF_ZEROFLAGS(bp) \ |
43ff2122 | 219 | ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \ |
1d5ae5df | 220 | XBF_SYNCIO|XBF_FUA|XBF_FLUSH)) |
ce8e922c | 221 | |
430cbeb8 | 222 | void xfs_buf_stale(struct xfs_buf *bp); |
0cadda1c CH |
223 | #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) |
224 | #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) | |
1da177e4 | 225 | |
ce8e922c NS |
226 | #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) |
227 | #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) | |
228 | #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) | |
229 | ||
ce8e922c NS |
230 | #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) |
231 | #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) | |
232 | #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) | |
233 | ||
ce8e922c NS |
234 | #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) |
235 | #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) | |
236 | #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) | |
237 | ||
238 | #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) | |
239 | #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) | |
240 | #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) | |
241 | ||
ce8e922c NS |
242 | #define XFS_BUF_ADDR(bp) ((bp)->b_bn) |
243 | #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) | |
244 | #define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) | |
245 | #define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) | |
246 | #define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) | |
247 | #define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) | |
248 | #define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) | |
249 | #define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) | |
250 | ||
38f23232 | 251 | static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) |
821eb21d DC |
252 | { |
253 | atomic_set(&bp->b_lru_ref, lru_ref); | |
254 | } | |
ce8e922c | 255 | |
811e64c7 CS |
256 | static inline int xfs_buf_ispinned(struct xfs_buf *bp) |
257 | { | |
258 | return atomic_read(&bp->b_pin_count); | |
259 | } | |
ce8e922c | 260 | |
ce8e922c | 261 | static inline void xfs_buf_relse(xfs_buf_t *bp) |
1da177e4 | 262 | { |
bfc60177 | 263 | xfs_buf_unlock(bp); |
ce8e922c | 264 | xfs_buf_rele(bp); |
1da177e4 LT |
265 | } |
266 | ||
1da177e4 LT |
267 | /* |
268 | * Handling of buftargs. | |
269 | */ | |
ebad861b DC |
270 | extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
271 | struct block_device *, int, const char *); | |
c141b292 | 272 | extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); |
1da177e4 LT |
273 | extern void xfs_wait_buftarg(xfs_buftarg_t *); |
274 | extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); | |
d808f617 | 275 | |
ce8e922c NS |
276 | #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
277 | #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) | |
278 | ||
1da177e4 | 279 | #endif /* __XFS_BUF_H__ */ |