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work out device name to use for read ahead request

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This commit is contained in:
Alasdair Kergon 2007-12-05 16:24:41 +00:00
parent 0ba25de173
commit 9a22e746b5
1 changed files with 23 additions and 1 deletions
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24
libdm/ioctl/libdm-iface.c
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@ -922,7 +922,29 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
uint32_t dm_task_get_read_ahead(const struct dm_task *dmt, uint32_t *read_ahead)
{
return get_dev_node_read_ahead(dmt->dev_name, read_ahead);
const char *dev_name;
*read_ahead = 0;
#ifdef DM_COMPAT
/* Not supporting this */
if (_dm_version == 1)
return 1;
#endif
if (!dmt->dmi.v4 || !(dmt->dmi.v4->flags & DM_EXISTS_FLAG))
return 0;
if (*dmt->dmi.v4->name)
dev_name = dmt->dmi.v4->name;
else if (dmt->dev_name)
dev_name = dmt->dev_name;
else {
log_error("Get read ahead request failed: device name unrecorded.");
return 0;
}
return get_dev_node_read_ahead(dev_name, read_ahead);
}
const char *dm_task_get_name(const struct dm_task *dmt)