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dm ioctl: report event number in DM_LIST_DEVICES

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Report the event numbers for all the devices, so that the user doesn't
have to ask them one by one.  The event number is reported after the
name field in the dm_name_list structure.

The location of the next record is specified in the dm_name_list->next
field, that means that we can put the new data after the end of name and
it is backward compatible with the old code.  The old code just skips
the event number without interpreting it.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2017-01-16 16:07:01 -05:00 committed by Mike Snitzer
parent fc1841e1c1
commit 23d70c5e52
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-ioctl.c
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@ -506,6 +506,7 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
size_t len, needed = 0;
struct gendisk *disk;
struct dm_name_list *nl, *old_nl = NULL;
uint32_t *event_nr;
down_write(&_hash_lock);
@ -518,6 +519,7 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
needed += sizeof(struct dm_name_list);
needed += strlen(hc->name) + 1;
needed += ALIGN_MASK;
needed += (sizeof(uint32_t) + ALIGN_MASK) & ~ALIGN_MASK;
}
}
@ -547,7 +549,9 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
strcpy(nl->name, hc->name);
old_nl = nl;
nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1);
event_nr = align_ptr(((void *) (nl + 1)) + strlen(hc->name) + 1);
*event_nr = dm_get_event_nr(hc->md);
nl = align_ptr(event_nr + 1);
}
}