linux-ext4 - Re: [PATCH v10 1/9] doc: update ext4 and journalling docs to include fast commit feature

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Date:   Wed, 21 Oct 2020 10:25:14 -0700
From:   harshad shirwadkar <harshadshirwadkar@...il.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>,
        "Theodore Y. Ts'o" <tytso@....edu>
Subject: Re: [PATCH v10 1/9] doc: update ext4 and journalling docs to include
 fast commit feature

Thanks Jan for taking a look at the patches.

On Wed, Oct 21, 2020 at 9:04 AM Jan Kara <jack@...e.cz> wrote:
>
> On Thu 15-10-20 13:37:53, Harshad Shirwadkar wrote:
> > +   * - EXT4_FC_TAG_CREAT
> > +     - Create directory entry for a newly created file
> > +     - ``struct ext4_fc_dentry_info``
> > +     - Stores the parent inode numer, inode number and directory entry of the
>                                   ^^^ number
Ack
>
> > +       newly created file
> > +   * - EXT4_FC_TAG_LINK
> > +     - Link a directory entry to an inode
> > +     - ``struct ext4_fc_dentry_info``
> > +     - Stores the parent inode numer, inode number and directory entry
>                                   ^^^^ number
Ack
>
> BTW, how is EXT4_FC_TAG_CREAT different from EXT4_FC_TAG_LINK? It seems
> like they describe essentially the same operation?
In the replay path, creat has to do certain things that link doesn't.
For example, "creat" needs to mark the inode as used in the bitmap and
also if it's a directory that's being created, it needs to initialize
the "." and ".." dirents in the directory. That's why we need
different tags.
>
> > +   * - EXT4_FC_TAG_UNLINK
> > +     - Unink a directory entry of an inode
>           ^^^^ Unlink
Ack

Thanks,
Harshad
>
>                                                                         Honza
> --
> Jan Kara <jack@...e.com>
> SUSE Labs, CR