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34 * @(#)buf.h 8.9 (Berkeley) 3/30/95
41 #include <sys/queue.h>
46 typedef void bio_task_t(void *);
49 * The bio structure describes an I/O operation in the kernel.
52 u_int bio_cmd; /* I/O operation. */
53 struct cdev *bio_dev; /* Device to do I/O on. */
54 struct disk *bio_disk; /* Valid below geom_disk.c only */
55 off_t bio_offset; /* Offset into file. */
56 long bio_bcount; /* Valid bytes in buffer. */
57 caddr_t bio_data; /* Memory, superblocks, indirect etc. */
58 u_int bio_flags; /* BIO_ flags. */
59 int bio_error; /* Errno for BIO_ERROR. */
60 long bio_resid; /* Remaining I/0 in bytes. */
61 void (*bio_done)(struct bio *);
62 void *bio_driver1; /* Private use by the callee. */
63 void *bio_driver2; /* Private use by the callee. */
64 void *bio_caller1; /* Private use by the caller. */
65 void *bio_caller2; /* Private use by the caller. */
66 TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */
67 const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */
68 struct g_consumer *bio_from; /* GEOM linkage */
69 struct g_provider *bio_to; /* GEOM linkage */
70 off_t bio_length; /* Like bio_bcount */
71 off_t bio_completed; /* Inverse of bio_resid */
72 u_int bio_children; /* Number of spawned bios */
73 u_int bio_inbed; /* Children safely home by now */
74 struct bio *bio_parent; /* Pointer to parent */
75 struct bintime bio_t0; /* Time request started */
77 bio_task_t *bio_task; /* Task_queue handler */
78 void *bio_task_arg; /* Argument to above */
80 /* XXX: these go away when bio chaining is introduced */
81 daddr_t bio_pblkno; /* physical block number */
85 #define BIO_READ 0x00000001
86 #define BIO_WRITE 0x00000002
87 #define BIO_DELETE 0x00000004
88 #define BIO_GETATTR 0x00000008
89 #define BIO_CMD1 0x40000000 /* Available for local hacks */
90 #define BIO_CMD2 0x80000000 /* Available for local hacks */
93 #define BIO_ERROR 0x00000001
94 #define BIO_DONE 0x00000004
95 #define BIO_FLAG2 0x40000000 /* Available for local hacks */
96 #define BIO_FLAG1 0x80000000 /* Available for local hacks */
103 struct bio_queue_head {
104 TAILQ_HEAD(bio_queue, bio) queue;
106 struct bio *insert_point;
107 struct bio *switch_point;
110 void biodone(struct bio *bp);
111 void biofinish(struct bio *bp, struct devstat *stat, int error);
112 int biowait(struct bio *bp, const char *wchan);
114 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
115 struct bio *bioq_first(struct bio_queue_head *head);
116 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
117 void bioq_init(struct bio_queue_head *head);
118 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
119 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
121 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg);
123 int physio(struct cdev *dev, struct uio *uio, int ioflag);
124 #define physread physio
125 #define physwrite physio
129 #endif /* !_SYS_BIO_H_ */