Re: [PATCH] Show a warning message if one of highest objectid reaches its max value

[Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>]

Hi Filipe,

On 2016/03/04 18:28, Filipe Manana wrote:
> On Fri, Mar 4, 2016 at 2:37 AM, Satoru Takeuchi
> <takeuchi_satoru@jp.fujitsu.com> wrote:
>> - It's better to show a warning message for the exceptional case
>>    that one of highest objectid (in most case, inode number)
>>    reaches its max value, BTRFS_LAST_FREE_OBJECTID. Show this
>>    message only once to avoid filling dmesg with it.
>> - EOVERFLOW is more proper return value for this case.
>>    ENOSPC is for "No space left on device" case and objectid isn't
>>    related to any device.
>>
>> Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
>> ---
>> This patch can be applied to v4.5-rc6
>> ---
>>   fs/btrfs/inode-map.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
>> index e50316c..a4860fd 100644
>> --- a/fs/btrfs/inode-map.c
>> +++ b/fs/btrfs/inode-map.c
>> @@ -555,8 +555,10 @@ int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid)
>>          int ret;
>>          mutex_lock(&root->objectid_mutex);
>>
>> -       if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
>> -               ret = -ENOSPC;
>> +       if (WARN_ONCE(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID,
>> +                     "BTRFS: The highest objectid reaches its max value %llu.\n",
>> +                     BTRFS_LAST_FREE_OBJECTID)) {
>
> Please, use btrfs_warn() to print messages... It avoids hardcoding
> prefixes and having to copy the style of the
> btrfs_[info|warn|error|...) functions.
> Also include the id of the tree (root->root_key.objectid), it's much
> more useful than printing root->highes_objectid....
>
> Also add the prefix "Btrfs: " to the subject.

Thank you for your comment. I'll fix it.
>
>> +               ret = -EOVERFLOW;
>>                  goto out;
>>          }
>>
>> --
>> 2.5.0
>> --
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>
>
>