Goffredo Baroncelli wrote:
> On Wednesday, 15 December, 2010, Li Zefan wrote:
>> h4) objectid asis, type asis, offset++ -> we should get the correct result.
>
> This fix the problem of the "missing subvolume". But for the other case
> (searching for more than one type) the problem still here.
>
I don't think so. And the above "h4" has showed how we search for more
than one type.
The generic userland code for next search is:
/* this is in essence the same as how we advance key in kernel code */
if (sk->min_offset < (u64)-1 && sk->min_offset < sk->max_offset)
sk->min_offset++;
else if (sk->min_type < (u8)-1 && sk->min_type < sk->max_type) {
sk->min_offset = 0;
sk->min_type++;
} else if (sk->min_objectid < (u64)-1 && sk->min_objectid < sk->max_objectid){
sk->min_offset = 0;
sk->min_type = 0;
sk->min_objectid++;
} else
break;
ioctl(...);
for (i = 0; i < nr_items; i++) {
if (!filter(items[i]))
continue;
/* process this item */
...
}
>> because the current ioctl uses min_{x,y,z} and max_{x,y,z} as start_key and
>> end_key, and it returns all keys that falls in [start_key, end_key].
>>
>> So this btrfs-progs patch should fix missing subvolumes in the output of
>> "subvolume list":
>>
>> diff --git a/btrfs-list.c b/btrfs-list.c
>> index 93766a8..1b9ea45 100644
>> --- a/btrfs-list.c
>> +++ b/btrfs-list.c
>> @@ -620,7 +620,10 @@ int list_subvols(int fd)
>> /* this iteration is done, step forward one root for the
> next
>> * ioctl
>> */
>> - if (sk->min_objectid < (u64)-1) {
>> + if (sk->min_type < BTRFS_ROOT_BACKREF_KEY) {
>> + sk->min_type = BTRFS_ROOT_BACKREF_KEY;
>> + sk->min_offset = 0;
>> + } else if (sk->min_objectid < (u64)-1) {
>> sk->min_objectid++;
>> sk->min_type = BTRFS_ROOT_BACKREF_KEY;
>> sk->min_offset = 0;
>>
>
>
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