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 */ | |
49 | #define XBF_MAPPED (1 << 2) /* buffer mapped (b_addr valid) */ | |
50 | #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ | |
51 | #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ | |
52 | #define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ | |
53 | #define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ | |
807cbbdb CH |
54 | #define XBF_ORDERED (1 << 11)/* use ordered writes */ |
55 | #define XBF_READ_AHEAD (1 << 12)/* asynchronous read-ahead */ | |
56 | #define XBF_LOG_BUFFER (1 << 13)/* this is a buffer used for the log */ | |
1da177e4 | 57 | |
807cbbdb CH |
58 | /* flags used only as arguments to access routines */ |
59 | #define XBF_LOCK (1 << 14)/* lock requested */ | |
60 | #define XBF_TRYLOCK (1 << 15)/* lock requested, but do not wait */ | |
61 | #define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */ | |
1da177e4 | 62 | |
807cbbdb CH |
63 | /* flags used only internally */ |
64 | #define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */ | |
65 | #define _XBF_PAGES (1 << 18)/* backed by refcounted pages */ | |
66 | #define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */ | |
67 | #define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */ | |
6ab455ee | 68 | |
807cbbdb CH |
69 | /* |
70 | * Special flag for supporting metadata blocks smaller than a FSB. | |
71 | * | |
72 | * In this case we can have multiple xfs_buf_t on a single page and | |
73 | * need to lock out concurrent xfs_buf_t readers as they only | |
74 | * serialise access to the buffer. | |
75 | * | |
76 | * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation | |
77 | * between reads of the page. Hence we can have one thread read the | |
78 | * page and modify it, but then race with another thread that thinks | |
79 | * the page is not up-to-date and hence reads it again. | |
80 | * | |
81 | * The result is that the first modifcation to the page is lost. | |
82 | * This sort of AGF/AGI reading race can happen when unlinking inodes | |
83 | * that require truncation and results in the AGI unlinked list | |
84 | * modifications being lost. | |
85 | */ | |
86 | #define _XBF_PAGE_LOCKED (1 << 22) | |
87 | ||
807cbbdb | 88 | typedef unsigned int xfs_buf_flags_t; |
1da177e4 | 89 | |
0b1b213f CH |
90 | #define XFS_BUF_FLAGS \ |
91 | { XBF_READ, "READ" }, \ | |
92 | { XBF_WRITE, "WRITE" }, \ | |
93 | { XBF_MAPPED, "MAPPED" }, \ | |
94 | { XBF_ASYNC, "ASYNC" }, \ | |
95 | { XBF_DONE, "DONE" }, \ | |
96 | { XBF_DELWRI, "DELWRI" }, \ | |
97 | { XBF_STALE, "STALE" }, \ | |
0b1b213f CH |
98 | { XBF_ORDERED, "ORDERED" }, \ |
99 | { XBF_READ_AHEAD, "READ_AHEAD" }, \ | |
100 | { XBF_LOCK, "LOCK" }, /* should never be set */\ | |
101 | { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ | |
102 | { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ | |
103 | { _XBF_PAGE_CACHE, "PAGE_CACHE" }, \ | |
104 | { _XBF_PAGES, "PAGES" }, \ | |
105 | { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \ | |
106 | { _XBF_DELWRI_Q, "DELWRI_Q" }, \ | |
80f6c29d | 107 | { _XBF_PAGE_LOCKED, "PAGE_LOCKED" } |
0b1b213f CH |
108 | |
109 | ||
ce8e922c | 110 | typedef enum { |
5e6a07df DC |
111 | XBT_FORCE_SLEEP = 0, |
112 | XBT_FORCE_FLUSH = 1, | |
ce8e922c | 113 | } xfs_buftarg_flags_t; |
1da177e4 LT |
114 | |
115 | typedef struct xfs_bufhash { | |
116 | struct list_head bh_list; | |
117 | spinlock_t bh_lock; | |
118 | } xfs_bufhash_t; | |
119 | ||
120 | typedef struct xfs_buftarg { | |
ce8e922c NS |
121 | dev_t bt_dev; |
122 | struct block_device *bt_bdev; | |
123 | struct address_space *bt_mapping; | |
ebad861b | 124 | struct xfs_mount *bt_mount; |
ce8e922c NS |
125 | unsigned int bt_bsize; |
126 | unsigned int bt_sshift; | |
127 | size_t bt_smask; | |
128 | ||
a6867a68 DC |
129 | /* per device delwri queue */ |
130 | struct task_struct *bt_task; | |
a6867a68 DC |
131 | struct list_head bt_delwrite_queue; |
132 | spinlock_t bt_delwrite_lock; | |
ce8e922c | 133 | unsigned long bt_flags; |
ff57ab21 DC |
134 | |
135 | /* LRU control structures */ | |
136 | struct shrinker bt_shrinker; | |
430cbeb8 DC |
137 | struct list_head bt_lru; |
138 | spinlock_t bt_lru_lock; | |
139 | unsigned int bt_lru_nr; | |
1da177e4 LT |
140 | } xfs_buftarg_t; |
141 | ||
142 | /* | |
ce8e922c | 143 | * xfs_buf_t: Buffer structure for pagecache-based buffers |
1da177e4 | 144 | * |
ce8e922c NS |
145 | * This buffer structure is used by the pagecache buffer management routines |
146 | * to refer to an assembly of pages forming a logical buffer. | |
147 | * | |
148 | * The buffer structure is used on a temporary basis only, and discarded when | |
149 | * released. The real data storage is recorded in the pagecache. Buffers are | |
1da177e4 LT |
150 | * hashed to the block device on which the file system resides. |
151 | */ | |
152 | ||
153 | struct xfs_buf; | |
ce8e922c | 154 | typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); |
1da177e4 | 155 | |
ce8e922c | 156 | #define XB_PAGES 2 |
1da177e4 LT |
157 | |
158 | typedef struct xfs_buf { | |
50f59e8e DC |
159 | /* |
160 | * first cacheline holds all the fields needed for an uncontended cache | |
161 | * hit to be fully processed. The semaphore straddles the cacheline | |
162 | * boundary, but the counter and lock sits on the first cacheline, | |
163 | * which is the only bit that is touched if we hit the semaphore | |
164 | * fast-path on locking. | |
165 | */ | |
166 | struct rb_node b_rbnode; /* rbtree node */ | |
167 | xfs_off_t b_file_offset; /* offset in file */ | |
168 | size_t b_buffer_length;/* size of buffer in bytes */ | |
169 | atomic_t b_hold; /* reference count */ | |
430cbeb8 | 170 | atomic_t b_lru_ref; /* lru reclaim ref count */ |
50f59e8e | 171 | xfs_buf_flags_t b_flags; /* status flags */ |
ce8e922c | 172 | struct semaphore b_sema; /* semaphore for lockables */ |
50f59e8e | 173 | |
430cbeb8 | 174 | struct list_head b_lru; /* lru list */ |
ce8e922c NS |
175 | wait_queue_head_t b_waiters; /* unpin waiters */ |
176 | struct list_head b_list; | |
74f75a0c | 177 | struct xfs_perag *b_pag; /* contains rbtree root */ |
ce8e922c | 178 | xfs_buftarg_t *b_target; /* buffer target (device) */ |
ce8e922c | 179 | xfs_daddr_t b_bn; /* block number for I/O */ |
ce8e922c NS |
180 | size_t b_count_desired;/* desired transfer size */ |
181 | void *b_addr; /* virtual address of buffer */ | |
182 | struct work_struct b_iodone_work; | |
ce8e922c | 183 | xfs_buf_iodone_t b_iodone; /* I/O completion function */ |
b4dd330b | 184 | struct completion b_iowait; /* queue for I/O waiters */ |
ce8e922c NS |
185 | void *b_fspriv; |
186 | void *b_fspriv2; | |
ce8e922c NS |
187 | struct page **b_pages; /* array of page pointers */ |
188 | struct page *b_page_array[XB_PAGES]; /* inline pages */ | |
50f59e8e DC |
189 | unsigned long b_queuetime; /* time buffer was queued */ |
190 | atomic_t b_pin_count; /* pin count */ | |
191 | atomic_t b_io_remaining; /* #outstanding I/O requests */ | |
192 | unsigned int b_page_count; /* size of page array */ | |
193 | unsigned int b_offset; /* page offset in first page */ | |
194 | unsigned short b_error; /* error code on I/O */ | |
ce8e922c NS |
195 | #ifdef XFS_BUF_LOCK_TRACKING |
196 | int b_last_holder; | |
1da177e4 LT |
197 | #endif |
198 | } xfs_buf_t; | |
199 | ||
200 | ||
201 | /* Finding and Reading Buffers */ | |
ce8e922c NS |
202 | extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, |
203 | xfs_buf_flags_t, xfs_buf_t *); | |
1da177e4 | 204 | #define xfs_incore(buftarg,blkno,len,lockit) \ |
ce8e922c | 205 | _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) |
1da177e4 | 206 | |
6ad112bf | 207 | extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 208 | xfs_buf_flags_t); |
6ad112bf | 209 | extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, |
ce8e922c | 210 | xfs_buf_flags_t); |
1da177e4 | 211 | |
ce8e922c | 212 | extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *); |
686865f7 | 213 | extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); |
ce8e922c NS |
214 | extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); |
215 | extern void xfs_buf_hold(xfs_buf_t *); | |
1a1a3e97 | 216 | extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t); |
5adc94c2 DC |
217 | struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, |
218 | struct xfs_buftarg *target, | |
219 | xfs_daddr_t daddr, size_t length, int flags); | |
1da177e4 LT |
220 | |
221 | /* Releasing Buffers */ | |
ce8e922c NS |
222 | extern void xfs_buf_free(xfs_buf_t *); |
223 | extern void xfs_buf_rele(xfs_buf_t *); | |
1da177e4 LT |
224 | |
225 | /* Locking and Unlocking Buffers */ | |
ce8e922c NS |
226 | extern int xfs_buf_cond_lock(xfs_buf_t *); |
227 | extern int xfs_buf_lock_value(xfs_buf_t *); | |
228 | extern void xfs_buf_lock(xfs_buf_t *); | |
229 | extern void xfs_buf_unlock(xfs_buf_t *); | |
1da177e4 LT |
230 | |
231 | /* Buffer Read and Write Routines */ | |
64e0bc7d | 232 | extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp); |
5d765b97 | 233 | extern void xfs_bdwrite(void *mp, xfs_buf_t *bp); |
4e23471a CH |
234 | |
235 | extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); | |
236 | extern int xfs_bdstrat_cb(struct xfs_buf *); | |
237 | ||
ce8e922c NS |
238 | extern void xfs_buf_ioend(xfs_buf_t *, int); |
239 | extern void xfs_buf_ioerror(xfs_buf_t *, int); | |
ce8e922c NS |
240 | extern int xfs_buf_iorequest(xfs_buf_t *); |
241 | extern int xfs_buf_iowait(xfs_buf_t *); | |
b9c48649 | 242 | extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, |
ce8e922c | 243 | xfs_buf_rw_t); |
1a1a3e97 CH |
244 | #define xfs_buf_zero(bp, off, len) \ |
245 | xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) | |
ce8e922c | 246 | |
ce8e922c | 247 | static inline int xfs_buf_geterror(xfs_buf_t *bp) |
1da177e4 | 248 | { |
ce8e922c | 249 | return bp ? bp->b_error : ENOMEM; |
1da177e4 LT |
250 | } |
251 | ||
252 | /* Buffer Utility Routines */ | |
ce8e922c | 253 | extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); |
1da177e4 | 254 | |
1da177e4 | 255 | /* Delayed Write Buffer Routines */ |
ce8e922c | 256 | extern void xfs_buf_delwri_dequeue(xfs_buf_t *); |
d808f617 | 257 | extern void xfs_buf_delwri_promote(xfs_buf_t *); |
1da177e4 LT |
258 | |
259 | /* Buffer Daemon Setup Routines */ | |
ce8e922c NS |
260 | extern int xfs_buf_init(void); |
261 | extern void xfs_buf_terminate(void); | |
1da177e4 | 262 | |
ce8e922c NS |
263 | #define xfs_buf_target_name(target) \ |
264 | ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; }) | |
1da177e4 LT |
265 | |
266 | ||
ce8e922c | 267 | #define XFS_BUF_BFLAGS(bp) ((bp)->b_flags) |
f5faad79 NS |
268 | #define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \ |
269 | ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED)) | |
ce8e922c | 270 | |
430cbeb8 DC |
271 | void xfs_buf_stale(struct xfs_buf *bp); |
272 | #define XFS_BUF_STALE(bp) xfs_buf_stale(bp); | |
0cadda1c CH |
273 | #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) |
274 | #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) | |
ce8e922c NS |
275 | #define XFS_BUF_SUPER_STALE(bp) do { \ |
276 | XFS_BUF_STALE(bp); \ | |
277 | xfs_buf_delwri_dequeue(bp); \ | |
278 | XFS_BUF_DONE(bp); \ | |
279 | } while (0) | |
1da177e4 | 280 | |
ce8e922c NS |
281 | #define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI) |
282 | #define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp) | |
283 | #define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI) | |
284 | ||
285 | #define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no) | |
286 | #define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp) | |
287 | #define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0) | |
288 | ||
289 | #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) | |
290 | #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) | |
291 | #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) | |
292 | ||
293 | #define XFS_BUF_BUSY(bp) do { } while (0) | |
294 | #define XFS_BUF_UNBUSY(bp) do { } while (0) | |
295 | #define XFS_BUF_ISBUSY(bp) (1) | |
296 | ||
297 | #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) | |
298 | #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) | |
299 | #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) | |
300 | ||
301 | #define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED) | |
302 | #define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED) | |
303 | #define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED) | |
ce8e922c NS |
304 | |
305 | #define XFS_BUF_HOLD(bp) xfs_buf_hold(bp) | |
306 | #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) | |
307 | #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) | |
308 | #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) | |
309 | ||
310 | #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) | |
311 | #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) | |
312 | #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) | |
313 | ||
ce8e922c NS |
314 | #define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone) |
315 | #define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func)) | |
316 | #define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL) | |
ce8e922c NS |
317 | |
318 | #define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv) | |
319 | #define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val)) | |
320 | #define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2) | |
321 | #define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val)) | |
ce8e922c | 322 | #define XFS_BUF_SET_START(bp) do { } while (0) |
ce8e922c NS |
323 | |
324 | #define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr) | |
325 | #define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt) | |
326 | #define XFS_BUF_ADDR(bp) ((bp)->b_bn) | |
327 | #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) | |
328 | #define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) | |
329 | #define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) | |
330 | #define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) | |
331 | #define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) | |
332 | #define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) | |
333 | #define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) | |
334 | ||
821eb21d DC |
335 | static inline void |
336 | xfs_buf_set_ref( | |
337 | struct xfs_buf *bp, | |
338 | int lru_ref) | |
339 | { | |
340 | atomic_set(&bp->b_lru_ref, lru_ref); | |
341 | } | |
342 | #define XFS_BUF_SET_VTYPE_REF(bp, type, ref) xfs_buf_set_ref(bp, ref) | |
ce8e922c | 343 | #define XFS_BUF_SET_VTYPE(bp, type) do { } while (0) |
ce8e922c | 344 | |
4d16e924 | 345 | #define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count)) |
ce8e922c NS |
346 | |
347 | #define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp) | |
348 | #define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0) | |
349 | #define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp) | |
350 | #define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp) | |
b4dd330b | 351 | #define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait); |
ce8e922c NS |
352 | |
353 | #define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target)) | |
354 | #define XFS_BUF_TARGET(bp) ((bp)->b_target) | |
355 | #define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target) | |
356 | ||
ce8e922c | 357 | static inline void xfs_buf_relse(xfs_buf_t *bp) |
1da177e4 | 358 | { |
bfc60177 | 359 | xfs_buf_unlock(bp); |
ce8e922c | 360 | xfs_buf_rele(bp); |
1da177e4 LT |
361 | } |
362 | ||
1da177e4 LT |
363 | /* |
364 | * Handling of buftargs. | |
365 | */ | |
ebad861b DC |
366 | extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
367 | struct block_device *, int, const char *); | |
c141b292 | 368 | extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); |
1da177e4 LT |
369 | extern void xfs_wait_buftarg(xfs_buftarg_t *); |
370 | extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); | |
1da177e4 | 371 | extern int xfs_flush_buftarg(xfs_buftarg_t *, int); |
d808f617 | 372 | |
e6a0e9cd TS |
373 | #ifdef CONFIG_KDB_MODULES |
374 | extern struct list_head *xfs_get_buftarg_list(void); | |
375 | #endif | |
1da177e4 | 376 | |
ce8e922c NS |
377 | #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
378 | #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) | |
379 | ||
380 | #define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1) | |
381 | #define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1) | |
1da177e4 LT |
382 | |
383 | #endif /* __XFS_BUF_H__ */ |