fd4c2b74f3
The implementation is in libblockdriver, and works transparently for all block drivers. The new btrace(8) tool can be used to control block tracing; see ``man btrace'' for details.
41 lines
938 B
C
41 lines
938 B
C
#ifndef _MINIX_BTRACE_H
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#define _MINIX_BTRACE_H
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/* Control directives. */
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enum {
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BTCTL_START,
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BTCTL_STOP
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};
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/* Request codes. */
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enum {
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BTREQ_OPEN,
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BTREQ_CLOSE,
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BTREQ_READ,
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BTREQ_WRITE,
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BTREQ_GATHER,
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BTREQ_SCATTER,
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BTREQ_IOCTL
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};
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/* Special result codes. */
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#define BTRES_INPROGRESS (-997)
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/* Block trace entry. */
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typedef struct {
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u32_t request; /* request code; one of BTR_xxx */
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u32_t size; /* request size, ioctl request, or access */
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u64_t position; /* starting disk position */
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u32_t flags; /* transfer flags */
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i32_t result; /* request result; OK, bytes, or error */
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u32_t start_time; /* request service start time (us) */
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u32_t finish_time; /* request service completion time (us) */
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} btrace_entry; /* (32 bytes) */
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/* This is the number of btrace_entry structures copied out at once using the
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* BIOCTRACEGET ioctl call.
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*/
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#define BTBUF_SIZE 1024
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#endif /* _MINIX_BTRACE_H */
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