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

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Message-ID: <20201022130616.GC24163@quack2.suse.cz>
Date:   Thu, 22 Oct 2020 15:06:16 +0200
From:   Jan Kara <jack@...e.cz>
To:     harshad shirwadkar <harshadshirwadkar@...il.com>
Cc:     Jan Kara <jack@...e.cz>,
        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

On Wed 21-10-20 10:25:14, harshad shirwadkar wrote:
> > 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.

Aha, OK, makes sence. Thanks for explanation. BTW it would be good to have
some documentation (or at least examples) how a sequence of system calls
translates to fastcommit log entries and then how these are replayed in
case of crash.

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