root / lab4 / .minix-src / include / sys / ioc_fbd.h @ 13
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| 1 | 13 | up20180614 | /* sys/ioc_fbd.h - Faulty Block Device ioctl() command codes.
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| 2 | *
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| 3 | */
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| 4 | |||
| 5 | #ifndef _S_I_FBD_H
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| 6 | #define _S_I_FBD_H
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| 7 | |||
| 8 | /* FBD rule structure. */
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| 9 | |||
| 10 | typedef int fbd_rulenum_t; |
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| 11 | |||
| 12 | struct fbd_rule {
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| 13 | fbd_rulenum_t num; /* rule number (1-based) */
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| 14 | u64_t start; /* start position of area to match */
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| 15 | u64_t end; /* end position (exclusive) (0 = up to EOF) */
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| 16 | int flags; /* match read and/or write requests */ |
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| 17 | unsigned int skip; /* # matches to skip before activating */ |
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| 18 | unsigned int count; /* # times left to trigger (0 = no limit) */ |
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| 19 | int action; /* action type to perform when triggered */ |
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| 20 | |||
| 21 | union { /* action parameters */ |
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| 22 | struct {
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| 23 | int type; /* corruption type */ |
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| 24 | } corrupt; |
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| 25 | |||
| 26 | struct {
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| 27 | int code; /* error code to return (OK, EIO..) */ |
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| 28 | } error; |
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| 29 | |||
| 30 | struct {
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| 31 | u64_t start; /* start position of target area */
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| 32 | u64_t end; /* end position of area (excl) */
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| 33 | u32_t align; /* alignment to use in target area */
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| 34 | } misdir; |
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| 35 | |||
| 36 | struct {
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| 37 | u32_t lead; /* # bytes to process normally */
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| 38 | } losttorn; |
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| 39 | } params; |
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| 40 | }; |
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| 41 | |||
| 42 | /* Match flags. */
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| 43 | #define FBD_FLAG_READ 0x1 /* match read requests */ |
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| 44 | #define FBD_FLAG_WRITE 0x2 /* match write requests */ |
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| 45 | |||
| 46 | /* Action types. */
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| 47 | enum {
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| 48 | FBD_ACTION_CORRUPT, /* write or return corrupt data */
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| 49 | FBD_ACTION_ERROR, /* return an I/O error */
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| 50 | FBD_ACTION_MISDIR, /* perform a misdirected write */
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| 51 | FBD_ACTION_LOSTTORN /* perform a lost or torn write */
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| 52 | }; |
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| 53 | |||
| 54 | /* Corruption types. */
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| 55 | enum {
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| 56 | FBD_CORRUPT_ZERO, /* write or return ..zeroed data */
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| 57 | FBD_CORRUPT_PERSIST, /* ..consequently the same bad data */
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| 58 | FBD_CORRUPT_RANDOM /* ..new random data every time */
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| 59 | }; |
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| 60 | |||
| 61 | /* The I/O control requests. */
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| 62 | #define FBDCADDRULE _IOW('B', 1, struct fbd_rule) /* add a rule */ |
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| 63 | #define FBDCDELRULE _IOW('B', 2, fbd_rulenum_t) /* delete a rule */ |
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| 64 | #define FBDCGETRULE _IOWR('B', 3, struct fbd_rule) /* retrieve a rule */ |
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| 65 | |||
| 66 | #endif /* _S_I_FBD_H */ |