linux-ext4 - Re: [PATCH] misc/e4defrag: output extent's status(written or unwritten)

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Message-ID: <54221A27.6020201@cn.fujitsu.com>
Date:	Wed, 24 Sep 2014 09:11:03 +0800
From:	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
To:	Andreas Dilger <adilger@...ger.ca>
CC:	"<linux-ext4@...r.kernel.org>" <linux-ext4@...r.kernel.org>,
	"<tytso@....edu>" <tytso@....edu>,
	"<darrick.wong@...cle.com>" <darrick.wong@...cle.com>
Subject: Re: [PATCH] misc/e4defrag: output extent's status(written or unwritten)

Hi,

On 09/24/2014 03:02 AM, Andreas Dilger wrote:
> It would be nice if the output would match the format used by filefrag.
OK, will send a V2 version, thanks!

Regards,
Xiaoguang Wang
 
> 
> Cheers, Andreas
> 
>> On Sep 23, 2014, at 12:41, Xiaoguang Wang <wangxg.fnst@...fujitsu.com> wrote:
>>
>> Before this patch, the output woulld be(e4defrag -c -v testfile):
>> <File>
>> [ext 1]:        start 33796:    logical 0:      len 1
>> [ext 2]:        start 9267:     logical 1:      len 29
>> [ext 3]:        start 9296:     logical 30:     len 1
>> [ext 4]:        start 9297:     logical 31:     len 29
>> [ext 5]:        start 9326:     logical 60:     len 1
>> [ext 6]:        start 9327:     logical 61:     len 29
>> ...
>> [ext 32]:       start 9265:     logical 800:    len 1
>> [ext 33]:       start 9266:     logical 900:    len 1
>>
>> Total/best extents                             33/1
>> Average size per extent                        61 KB
>> Fragmentation score                            51
>> [0-30 no problem: 31-55 a little bit fragmented: 56- needs defrag]
>> This file (/mnt/xfstests/scratch/test.10) does not need defragmentation.
>> Done.
>>
>> After this patch, the output would be:
>> <File>
>> [ext 1]:   start 33796:    logical 0:      len 1   [written]
>> [ext 2]:   start 9267:     logical 1:      len 29  [unwritten]
>> [ext 3]:   start 9296:     logical 30:     len 1   [written]
>> [ext 4]:   start 9297:     logical 31:     len 29  [unwritten]
>> [ext 5]:   start 9326:     logical 60:     len 1   [written]
>> [ext 6]:   start 9327:     logical 61:     len 29  [unwritten]
>> ...
>> [ext 32]:  start 9265:     logical 800:    len 1   [unwritten]
>> [ext 33]:  start 9266:     logical 900:    len 1   [unwritten]
>>
>> Total/best extents                             33/1
>> Average size per extent                        61 KB
>> Fragmentation score                            51
>> [0-30 no problem: 31-55 a little bit fragmented: 56- needs defrag]
>> This file (/mnt/xfstests/scratch/test.10) does not need defragmentation.
>> Done.
>>
>> Signed-off-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
>> ---
>> misc/e4defrag.c | 14 ++++++++++----
>> 1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/misc/e4defrag.c b/misc/e4defrag.c
>> index d0eac60..b39e263 100644
>> --- a/misc/e4defrag.c
>> +++ b/misc/e4defrag.c
>> @@ -129,6 +129,7 @@ struct fiemap_extent_data {
>>    __u64 len;            /* blocks count */
>>    __u64 logical;        /* start logical block number */
>>    ext4_fsblk_t physical;        /* start physical block number */
>> +    __u32 fe_flags;        /* FIEMAP_EXTENT_* flags for this extent */
>> };
>>
>> struct fiemap_extent_list {
>> @@ -831,6 +832,7 @@ static int get_file_extents(int fd, struct fiemap_extent_list **ext_list_head)
>>                        / block_size;
>>            ext_list->data.len = ext_buf[i].fe_length
>>                        / block_size;
>> +            ext_list->data.fe_flags = ext_buf[i].fe_flags;
>>
>>            ret = insert_extent_by_physical(
>>                    ext_list_head, ext_list);
>> @@ -1170,12 +1172,16 @@ static int file_statistic(const char *file, const struct stat64 *buf,
>>
>>            /* Print extents info */
>>            do {
>> +                char *status = ext_list_tmp->data.fe_flags &
>> +                    FIEMAP_EXTENT_UNWRITTEN ?
>> +                    "unwritten" : "written";
>>                count++;
>>                printf("[ext %d]:\tstart %llu:\tlogical "
>> -                        "%llu:\tlen %llu\n", count,
>> -                        ext_list_tmp->data.physical,
>> -                        ext_list_tmp->data.logical,
>> -                        ext_list_tmp->data.len);
>> +                       "%llu:\tlen %llu \t[%s]\n", count,
>> +                       ext_list_tmp->data.physical,
>> +                       ext_list_tmp->data.logical,
>> +                       ext_list_tmp->data.len,
>> +                       status);
>>                ext_list_tmp = ext_list_tmp->next;
>>            } while (ext_list_tmp != logical_list_head);
>>
>> -- 
>> 1.8.2.1
>>
>> --
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> .
> 

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