DCMD_F3S_RECLAIMCTL
QNX SDP8.0Devctl and Ioctl CommandsDeveloper
Provide runtime control of reclaims
Synopsis:
#include <sys/dcmd_f3s.h>
#define DCMD_F3S_RECLAIMCTL __DIOTF(_DCMD_F3S, F3S_RECLAIMCTL, f3s_reclaimctl_t)
Arguments to devctl():
| Argument | Value |
|---|---|
| filedes | A file descriptor that you obtained by opening the device. |
| dcmd | DCMD_F3S_RECLAIMCTL |
| dev_data_ptr | A pointer to a f3s_reclaimctl_t structure (see below) |
| n_bytes | sizeof(f3s_reclaimctl_t) |
| dev_info_ptr | NULL |
Description:
This command provides runtime control of reclaim operations.
Input:
A f3s_reclaimctl_t structure:
typedef struct f3s_reclaimctl_s
{
int16_t super_count;
int16_t stale_percent;
int16_t reclaim_enable;
int16_t reserved; /* To pad the structure */
}f3s_reclaimctl_t;
The members include:
- super_count
- The number of overwrite hops. If the value isn't -1, it becomes the new effective reclaim threshold.
- stale_percent
- The percentage of stale blocks. If the value isn't -1, it becomes the new effective reclaim trigger.
- reclaim_enable
- 1 to enable reclaims, 0 to disable them, or -1 to leave the current setting unchanged.
Output:
A f3s_reclaimctl_t structure that's filled in by the driver with the old settings.
See also:
devctl() in the QNX OS C Library Reference
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