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34 * @(#)buf.h 8.9 (Berkeley) 3/30/95
41 #include <sys/queue.h>
45 #define BIO_WRITE 0x02
46 #define BIO_DELETE 0x04
47 #define BIO_GETATTR 0x08
48 #define BIO_FLUSH 0x10
49 #define BIO_CMD0 0x20 /* Available for local hacks */
50 #define BIO_CMD1 0x40 /* Available for local hacks */
51 #define BIO_CMD2 0x80 /* Available for local hacks */
54 #define BIO_ERROR 0x01
56 #define BIO_ONQUEUE 0x04
57 #define BIO_ORDERED 0x08
63 /* Empty classifier tag, to prevent further classification. */
64 #define BIO_NOTCLASSIFIED (void *)(~0UL)
66 typedef void bio_task_t(void *);
69 * The bio structure describes an I/O operation in the kernel.
72 uint8_t bio_cmd; /* I/O operation. */
73 uint8_t bio_flags; /* General flags. */
74 uint8_t bio_cflags; /* Private use by the consumer. */
75 uint8_t bio_pflags; /* Private use by the provider. */
76 struct cdev *bio_dev; /* Device to do I/O on. */
77 struct disk *bio_disk; /* Valid below geom_disk.c only */
78 off_t bio_offset; /* Offset into file. */
79 long bio_bcount; /* Valid bytes in buffer. */
80 caddr_t bio_data; /* Memory, superblocks, indirect etc. */
81 int bio_error; /* Errno for BIO_ERROR. */
82 long bio_resid; /* Remaining I/O in bytes. */
83 void (*bio_done)(struct bio *);
84 void *bio_driver1; /* Private use by the provider. */
85 void *bio_driver2; /* Private use by the provider. */
86 void *bio_caller1; /* Private use by the consumer. */
87 void *bio_caller2; /* Private use by the consumer. */
88 TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */
89 const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */
90 struct g_consumer *bio_from; /* GEOM linkage */
91 struct g_provider *bio_to; /* GEOM linkage */
92 off_t bio_length; /* Like bio_bcount */
93 off_t bio_completed; /* Inverse of bio_resid */
94 u_int bio_children; /* Number of spawned bios */
95 u_int bio_inbed; /* Children safely home by now */
96 struct bio *bio_parent; /* Pointer to parent */
97 struct bintime bio_t0; /* Time request started */
99 bio_task_t *bio_task; /* Task_queue handler */
100 void *bio_task_arg; /* Argument to above */
102 void *bio_classifier1; /* Classifier tag. */
103 void *bio_classifier2; /* Classifier tag. */
111 /* XXX: these go away when bio chaining is introduced */
112 daddr_t bio_pblkno; /* physical block number */
118 struct bio_queue_head {
119 TAILQ_HEAD(bio_queue, bio) queue;
121 struct bio *insert_point;
124 void biodone(struct bio *bp);
125 void biofinish(struct bio *bp, struct devstat *stat, int error);
126 int biowait(struct bio *bp, const char *wchan);
128 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
129 struct bio *bioq_first(struct bio_queue_head *head);
130 struct bio *bioq_takefirst(struct bio_queue_head *head);
131 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
132 void bioq_init(struct bio_queue_head *head);
133 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
134 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
135 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
137 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg);
139 int physio(struct cdev *dev, struct uio *uio, int ioflag);
140 #define physread physio
141 #define physwrite physio
145 #endif /* !_SYS_BIO_H_ */