27 строки
1.3 KiB
C
27 строки
1.3 KiB
C
typedef struct scsi_request Scsi_Request;
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static Scsi_Request *dummy_cmdp; /* only used for sizeof */
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typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
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unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
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unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
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unsigned bufflen; /* Size of (aggregate) data buffer */
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unsigned b_malloc_len; /* actual len malloc'ed in buffer */
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void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
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char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
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unsigned char cmd_opcode; /* first byte of command */
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} Sg_scatter_hold;
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typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
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Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
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struct sg_request *nextrp; /* NULL -> tail request (slist) */
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struct sg_fd *parentfp; /* NULL -> not in use */
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Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
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sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
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unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
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char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
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char orphan; /* 1 -> drop on sight, 0 -> normal */
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char sg_io_owned; /* 1 -> packet belongs to SG_IO */
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volatile char done; /* 0->before bh, 1->before read, 2->read */
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} Sg_request;
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