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