linux-kernel - Re: [PATCH v2 3/3] fat: warn when discard request fails other than EOPNOTSUPP

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Date:	Sun, 11 Nov 2012 20:39:26 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Amit Sahrawat <amit.sahrawat83@...il.com>
Subject: Re: [PATCH v2 3/3] fat: warn when discard request fails other than EOPNOTSUPP

2012/11/5 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>> FAT also warn user then the discard request fails
>> as ext4(http://patchwork.ozlabs.org/patch/192669/)
>
> Why don't we do this at block layer like normal bio?
Yes, maybe it will be better than doing in filesystem.
I will check more.
Thanks.
>
>> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
>> Signed-off-by: Amit Sahrawat <amit.sahrawat83@...il.com>
>> ---
>>  fs/fat/fatent.c |   15 +++++++++------
>>  1 file changed, 9 insertions(+), 6 deletions(-)
>>
>> diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
>> index 260705c..fc1f407 100644
>> --- a/fs/fat/fatent.c
>> +++ b/fs/fat/fatent.c
>> @@ -583,12 +583,15 @@ int fat_free_clusters(struct inode *inode, int cluster)
>>                        */
>>                       if (cluster != fatent.entry + 1) {
>>                               int nr_clus = fatent.entry - first_cl + 1;
>> -
>> -                             sb_issue_discard(sb,
>> -                                     fat_clus_to_blknr(sbi, first_cl),
>> -                                     nr_clus * sbi->sec_per_clus,
>> -                                     GFP_NOFS, 0);
>> -
>> +                             sector_t sblk = fat_clus_to_blknr(sbi, first_cl);
>> +                             sector_t nrblk = nr_clus * sbi->sec_per_clus;
>> +
>> +                             err = sb_issue_discard(sb,
>> +                                             sblk, nrblk, GFP_NOFS, 0);
>> +                             if (err && err != -EOPNOTSUPP)
>> +                                     fat_msg(sb, KERN_WARNING, "discard request for"
>> +                                                     " block:%llu count:%llu failed"
>> +                                                     " with %d", sblk, nrblk, err);
>>                               first_cl = cluster;
>>                       }
>>               }
>
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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