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36 * @(#)buf.h 8.9 (Berkeley) 3/30/95
43 #include <sys/queue.h>
44 #include <sys/disk_zone.h>
47 #define BIO_READ 0x01 /* Read I/O data */
48 #define BIO_WRITE 0x02 /* Write I/O data */
49 #define BIO_DELETE 0x03 /* TRIM or free blocks, i.e. mark as unused */
50 #define BIO_GETATTR 0x04 /* Get GEOM attributes of object */
51 #define BIO_FLUSH 0x05 /* Commit outstanding I/O now */
52 #define BIO_CMD0 0x06 /* Available for local hacks */
53 #define BIO_CMD1 0x07 /* Available for local hacks */
54 #define BIO_CMD2 0x08 /* Available for local hacks */
55 #define BIO_ZONE 0x09 /* Zone command */
56 #define BIO_SPEEDUP 0x0a /* Upper layers face shortage */
59 #define BIO_ERROR 0x01 /* An error occurred processing this bio. */
60 #define BIO_DONE 0x02 /* This bio is finished. */
61 #define BIO_ONQUEUE 0x04 /* This bio is in a queue & not yet taken. */
63 * This bio must be executed after all previous bios in the queue have been
64 * executed, and before any successive bios can be executed.
66 #define BIO_ORDERED 0x08
67 #define BIO_UNMAPPED 0x10
68 #define BIO_TRANSIENT_MAPPING 0x20
69 #define BIO_VLIST 0x40
71 #define PRINT_BIO_FLAGS "\20\7vlist\6transient_mapping\5unmapped" \
72 "\4ordered\3onqueue\2done\1error"
74 #define BIO_SPEEDUP_WRITE 0x4000 /* Resource shortage at upper layers */
75 #define BIO_SPEEDUP_TRIM 0x8000 /* Resource shortage at upper layers */
82 typedef void bio_task_t(void *);
85 * The bio structure describes an I/O operation in the kernel.
88 uint16_t bio_cmd; /* I/O operation. */
89 uint16_t bio_flags; /* General flags. */
90 uint16_t bio_cflags; /* Private use by the consumer. */
91 uint16_t bio_pflags; /* Private use by the provider. */
92 struct cdev *bio_dev; /* Device to do I/O on. */
93 struct disk *bio_disk; /* Valid below geom_disk.c only */
94 off_t bio_offset; /* Offset into file. */
95 long bio_bcount; /* Valid bytes in buffer. */
96 caddr_t bio_data; /* Memory, superblocks, indirect etc. */
97 struct vm_page **bio_ma; /* Or unmapped. */
98 int bio_ma_offset; /* Offset in the first page of bio_ma. */
99 int bio_ma_n; /* Number of pages in bio_ma. */
100 int bio_error; /* Errno for BIO_ERROR. */
101 long bio_resid; /* Remaining I/O in bytes. */
102 void (*bio_done)(struct bio *);
103 void *bio_driver1; /* Private use by the provider. */
104 void *bio_driver2; /* Private use by the provider. */
105 void *bio_caller1; /* Private use by the consumer. */
106 void *bio_caller2; /* Private use by the consumer. */
107 TAILQ_ENTRY(bio) bio_queue; /* Disksort queue. */
108 const char *bio_attribute; /* Attribute for BIO_[GS]ETATTR */
109 struct disk_zone_args bio_zone;/* Used for BIO_ZONE */
110 struct g_consumer *bio_from; /* GEOM linkage */
111 struct g_provider *bio_to; /* GEOM linkage */
112 off_t bio_length; /* Like bio_bcount */
113 off_t bio_completed; /* Inverse of bio_resid */
114 u_int bio_children; /* Number of spawned bios */
115 u_int bio_inbed; /* Children safely home by now */
116 struct bio *bio_parent; /* Pointer to parent */
117 struct bintime bio_t0; /* Time request started */
119 bio_task_t *bio_task; /* Task_queue handler */
120 void *bio_task_arg; /* Argument to above */
130 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
131 struct buf *bio_track_bp; /* Parent buf for tracking */
134 /* XXX: these go away when bio chaining is introduced */
135 daddr_t bio_pblkno; /* physical block number */
141 struct bio_queue_head {
142 TAILQ_HEAD(bio_queue, bio) queue;
144 struct bio *insert_point;
149 extern struct vm_map *bio_transient_map;
150 extern int bio_transient_maxcnt;
152 void biodone(struct bio *bp);
153 void biofinish(struct bio *bp, struct devstat *stat, int error);
154 int biowait(struct bio *bp, const char *wchan);
156 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
157 void biotrack_buf(struct bio *bp, const char *location);
160 biotrack(struct bio *bp, const char *location)
163 if (bp->bio_track_bp != NULL)
164 biotrack_buf(bp, location);
168 biotrack(struct bio *bp __unused, const char *location __unused)
173 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
174 struct bio *bioq_first(struct bio_queue_head *head);
175 struct bio *bioq_takefirst(struct bio_queue_head *head);
176 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
177 void bioq_init(struct bio_queue_head *head);
178 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
179 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
180 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
182 int physio(struct cdev *dev, struct uio *uio, int ioflag);
183 #define physread physio
184 #define physwrite physio
188 #endif /* !_SYS_BIO_H_ */