scoutos / prex-0.9.0 / include / sys / buf.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _SYS_BUF_H_
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31 | #define _SYS_BUF_H_
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32 | |||
33 | #include <sys/types.h> |
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34 | #include <sys/cdefs.h> |
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35 | #include <sys/list.h> |
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36 | |||
37 | /*
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38 | * Buffer header
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39 | */
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40 | struct buf {
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41 | struct list b_link; /* link to block list */ |
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42 | int b_flags; /* see defines below */ |
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43 | dev_t b_dev; /* device number */
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44 | int b_blkno; /* block # on device */ |
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45 | mutex_t b_lock; /* lock for access */
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46 | char *b_data; /* pointer to data buffer */ |
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47 | }; |
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48 | |||
49 | /*
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50 | * These flags are kept in b_flags.
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51 | */
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52 | #define B_BUSY 0x00000001 /* I/O in progress. */ |
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53 | #define B_DELWRI 0x00000002 /* delay I/O until buffer reused. */ |
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54 | #define B_INVAL 0x00000004 /* does not contain valid info. */ |
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55 | #define B_READ 0x00000008 /* read buffer. */ |
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56 | #define B_DONE 0x00000010 /* I/O completed. */ |
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57 | |||
58 | __BEGIN_DECLS |
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59 | struct buf *getblk(dev_t, int); |
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60 | int bread(dev_t, int, struct buf **); |
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61 | int bwrite(struct buf *); |
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62 | void bdwrite(struct buf *); |
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63 | void binval(dev_t);
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64 | void brelse(struct buf *); |
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65 | void bflush(struct buf *); |
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66 | void bio_sync(void); |
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67 | void bio_init(void); |
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68 | __END_DECLS |
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69 | |||
70 | #endif /* !_SYS_BUF_H_ */ |