From: Tao Ma <tm@tao.ma>
To: Theodore Ts'o <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH] ext4: Only call update_backups if necessary in online resize.
Date: Wed, 26 Sep 2012 11:51:01 +0800 [thread overview]
Message-ID: <50627BA5.60106@tao.ma> (raw)
In-Reply-To: <20120926033935.GD11468@thunk.org>
On 09/26/2012 11:39 AM, Theodore Ts'o wrote:
> On Mon, Sep 24, 2012 at 11:00:17PM +0800, Tao Ma wrote:
>> @@ -1355,8 +1356,16 @@ exit_journal:
>> int gdb_num;
>> gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb);
>> gdb_bh = sbi->s_group_desc[gdb_num];
>> - update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
>> - gdb_bh->b_size);
>> + /*
>> + * only backup the group descriptor block
>> + * which hasn't been updated before.
>> + */
>> + if (old_gdb != gdb_bh->b_blocknr) {
>> + update_backups(sb, gdb_bh->b_blocknr,
>> + gdb_bh->b_data,
>> + gdb_bh->b_size);
>> + old_gdb = gdb_bh->b_blocknr;
>> + }
>> }
>> }
>
> Don't we also need to add a call to update_backups() at the end of the
> loop so we update the backup block descriptors for the very last set
> of block groups?
Why? If it isn't the same as the previous one, it will be updated. If
it is the same, it don't need to be updated. I don't see what your mean
here.
Thanks
Tao
next prev parent reply other threads:[~2012-09-26 3:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-24 15:00 [PATCH] ext4: Only call update_backups if necessary in online resize Tao Ma
2012-09-26 3:39 ` Theodore Ts'o
2012-09-26 3:51 ` Tao Ma [this message]
2012-09-26 4:03 ` Theodore Ts'o
2012-09-26 5:26 ` Kevin Liao
2012-09-26 13:57 ` Theodore Ts'o
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=50627BA5.60106@tao.ma \
--to=tm@tao.ma \
--cc=linux-ext4@vger.kernel.org \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).