linux-ext4 - Re: [PATCH] Ext4: Update ext4 documentation

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Message-Id: <C9957B84-6B84-435F-83FF-8932ED36678A@dilger.ca>
Date:	Wed, 19 Jan 2011 15:27:57 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu, sandeen@...hat.com
Subject: Re: [PATCH] Ext4: Update ext4 documentation

On 2011-01-18, at 08:50, Lukas Czerner wrote:
> +Table of Ext4 specific ioctls
> +..............................................................................
> + Ioctl			      Description
> + EXT4_IOC_GETFLAGS	      Get additional attributes associated with files
> +			      in Ext4. The argument point to the integer.
> +			      Meaning of the particular bits are defined in
> +			      fs/ext4/ext4.

This is actually the same value as the FS_IOC_GETFLAGS ioctl.

> + EXT4_IOC_SETFLAGS	      Set additional attributes associated with files
> +			      in Ext4. The argument point to the integer.
> +			      Meaning of the particular bits are defined in
> +			      fs/ext4/ext4. If the file is a subject to quota,
> +			      setting inode flags is prohibited.

Likewise, this is the same value as FS_IOC_SETFLAGS.

> + EXT4_IOC_GETVERSION
> + EXT4_IOC_GETVERSION_OLD
> +			      Get the inode i_generation number stored for
> +			      each inode. This is particularly useful for
> +			      NFS in cases when one inode is unlinked and
> +			      then a new inode is created with the same inode
> +			      number. NFS daemon should know that it is not
> +			      the same inode, thus i_generation is needed.
> +			      All that said, it is normally changed only when
> +			      new inode is created.

Similarly, the FS_IOC_GETVERSION matches EXT4_IOC_GETVERSION_OLD.  Sadly, the move of this ioctl number to FS_IOC_GETVERSION used the old 'v' ioctl number that conflicts with a number of ioctls instead of the new 'f' ioctl number...

Cheers, Andreas





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