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RE: Creation of holes in JFFS2
thanks a lot man....its clear now.
> -----Original Message-----
> From: David Woodhouse [SMTP:firstname.lastname@example.org]
> Sent: Tuesday, November 27, 2001 8:29 PM
> To: Ravindra Teli
> Cc: email@example.com
> Subject: Re: Creation of holes in JFFS2
> RTeli@xxxxxxx.com said:
> > This duplication is confusing. I am assuming that before writing
> > (i.e. calling jffs2_commit_write() jffs2_prepare_write is being called
> > by vfs layer)
> In prepare_write() we write a real physical node to the flash to indicate
> that there is now a hole in the file. In add_full_dnode_to_fraglist, we
> only a marker in our list.
> We have to do the former to deal with the problems which may arise from
> truncating files, then extending them with holes in - we have to make sure
> that the old data don't 'show through' the holes.
> This means that the hole markers which we add to the list in the latter
> function shouldn't actually exist during normal operation - only while
> we're scanning the filesystem and haven't yet found all the physical nodes
> belonging to the inode in question.
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