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Markus Lidelb2aaee32005-06-23 22:02:19 -07001typedef struct scsi_request Scsi_Request;
2
3static Scsi_Request *dummy_cmdp; /* only used for sizeof */
4
5typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
6 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
7 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
8 unsigned bufflen; /* Size of (aggregate) data buffer */
9 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
10 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
11 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
12 unsigned char cmd_opcode; /* first byte of command */
13} Sg_scatter_hold;
14
15typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
16 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
17 struct sg_request *nextrp; /* NULL -> tail request (slist) */
18 struct sg_fd *parentfp; /* NULL -> not in use */
19 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
20 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
21 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
22 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
23 char orphan; /* 1 -> drop on sight, 0 -> normal */
24 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
25 volatile char done; /* 0->before bh, 1->before read, 2->read */
26} Sg_request;