Add a Persistent Reservations ioctl to read the current reservation. This calls the pr_ops->read_reservation() function that was previously added in commit c787f1baa503 ("block: Add PR callouts for read keys and reservation") but was only used by the in-kernel SCSI target so far. The IOC_PR_READ_RESERVATION ioctl is necessary so that userspace applications that rely on Persistent Reservations ioctls have a way of inspecting the current state. Cluster managers and validation tests need this functionality.
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| @@ -62,6 +62,12 @@ struct pr_read_keys { · 61 unmodified lines | ||
| 62 | 62 | __u64 keys_ptr; |
| 63 | 63 | }; |
| 64 | 64 | |
| 65 | +struct pr_read_reservation { | |
| 66 | + __u64 key; | |
| 67 | + __u32 generation; | |
| 68 | + __u32 type; | |
| 69 | +}; | |
| 70 | + | |
| 65 | 71 | #define PR_FL_IGNORE_KEY (1 << 0) /* ignore existing key */ |
| 66 | 72 | |
| 67 | 73 | #define IOC_PR_REGISTER _IOW('p', 200, struct pr_registration) |
| @@ -71,5 +77,6 @@ struct pr_read_keys { · 3 unmodified lines | ||
| 71 | 77 | #define IOC_PR_PREEMPT_ABORT _IOW('p', 204, struct pr_preempt) |
| 72 | 78 | #define IOC_PR_CLEAR _IOW('p', 205, struct pr_clear) |
| 73 | 79 | #define IOC_PR_READ_KEYS _IOWR('p', 206, struct pr_read_keys) |
| 80 | +#define IOC_PR_READ_RESERVATION _IOR('p', 207, struct pr_read_reservation) | |
| 74 | 81 | |
| 75 | 82 | #endif /* _UAPI_PR_H */ |