Thanks.
Sorry, not good new call time for me, but I can join occasionally.
I joined today, but too late.
Best regards,
Artem Blagodarenko.
> On 3 Oct 2019, at 18:55, Andreas Dilger <adilger@xxxxxxxxx> wrote:
>
> We just discussed this on the ext4 developer concall today, and Ted is looking into it.
>
> Cheers, Andreas
>
>> On Oct 3, 2019, at 09:47, Благодаренко Артём <artem.blagodarenko@xxxxxxxxx> wrote:
>>
>> Hello,
>>
>> Does anybody wants to give any feedback for this?
>> e2label became really faster on large partitions with this patch. Probably it can be useful.
>>
>> Ted, what do you think?
>>
>> Thanks,
>> Artem Blagodarenko.
>>
>>
>>
>>> On 5 Sep 2019, at 14:01, Artem Blagodarenko <artem.blagodarenko@xxxxxxxxx> wrote:
>>>
>>> tune2fs is used to make e2label duties. ext2fs_open2() reads group
>>> descriptors which are not used during disk label obtaining, but takes
>>> a lot of time on large partitions.
>>>
>>> This patch adds ext2fs_read_sb(), there only initialized superblock
>>> is returned This saves time dramatically.
>>>
>>> Signed-off-by: Artem Blagodarenko <c17828@xxxxxxxx>
>>> Cray-bug-id: LUS-5777
>>> ---
>>> lib/ext2fs/ext2fs.h | 2 ++
>>> lib/ext2fs/openfs.c | 16 ++++++++++++++++
>>> misc/tune2fs.c | 23 +++++++++++++++--------
>>> 3 files changed, 33 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
>>> index 59fd9742..3a63b74d 100644
>>> --- a/lib/ext2fs/ext2fs.h
>>> +++ b/lib/ext2fs/ext2fs.h
>>> @@ -1630,6 +1630,8 @@ extern int ext2fs_journal_sb_start(int blocksize);
>>> extern errcode_t ext2fs_open(const char *name, int flags, int superblock,
>>> unsigned int block_size, io_manager manager,
>>> ext2_filsys *ret_fs);
>>> +extern errcode_t ext2fs_read_sb(const char *name, io_manager manager,
>>> + struct ext2_super_block * super);
>>> extern errcode_t ext2fs_open2(const char *name, const char *io_options,
>>> int flags, int superblock,
>>> unsigned int block_size, io_manager manager,
>>> diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
>>> index 51b54a44..95f45d84 100644
>>> --- a/lib/ext2fs/openfs.c
>>> +++ b/lib/ext2fs/openfs.c
>>> @@ -99,6 +99,22 @@ static void block_sha_map_free_entry(void *data)
>>> return;
>>> }
>>>
>>> +errcode_t ext2fs_read_sb(const char *name, io_manager manager,
>>> + struct ext2_super_block * super)
>>> +{
>>> + io_channel io;
>>> + errcode_t retval = 0;
>>> +
>>> + retval = manager->open(name, 0, &io);
>>> + if (!retval) {
>>> + retval = io_channel_read_blk(io, 1, -SUPERBLOCK_SIZE,
>>> + super);
>>> + io_channel_close(io);
>>> + }
>>> +
>>> + return retval;
>>> +}
>>> +
>>> /*
>>> * Note: if superblock is non-zero, block-size must also be non-zero.
>>> * Superblock and block_size can be zero to use the default size.
>>> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
>>> index 7d2d38d7..fea607e1 100644
>>> --- a/misc/tune2fs.c
>>> +++ b/misc/tune2fs.c
>>> @@ -2879,6 +2879,21 @@ int tune2fs_main(int argc, char **argv)
>>> #endif
>>> io_ptr = unix_io_manager;
>>>
>>> + if (print_label) {
>>> + /* For e2label emulation */
>>> + struct ext2_super_block sb;
>>> +
>>> + /* Read only superblock. Nothing else metters.*/
>>> + retval = ext2fs_read_sb(device_name, io_ptr, &sb);
>>> + if (!retval) {
>>> + printf("%.*s\n", (int) sizeof(sb.s_volume_name),
>>> + sb.s_volume_name);
>>> + }
>>> +
>>> + remove_error_table(&et_ext2_error_table);
>>> + return retval;
>>> + }
>>> +
>>> retry_open:
>>> if ((open_flag & EXT2_FLAG_RW) == 0 || f_flag)
>>> open_flag |= EXT2_FLAG_SKIP_MMP;
>>> @@ -2972,14 +2987,6 @@ retry_open:
>>> sb = fs->super;
>>> fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
>>>
>>> - if (print_label) {
>>> - /* For e2label emulation */
>>> - printf("%.*s\n", (int) sizeof(sb->s_volume_name),
>>> - sb->s_volume_name);
>>> - remove_error_table(&et_ext2_error_table);
>>> - goto closefs;
>>> - }
>>> -
>>> retval = ext2fs_check_if_mounted(device_name, &mount_flags);
>>> if (retval) {
>>> com_err("ext2fs_check_if_mount", retval,
>>> --
>>> 2.14.3
>>>
>>
