linux-kernel - Re: [PATCH 5/6] statx: Make windows attributes available for CIFS, NTFS and FAT to use

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Message-ID: <10431.1462307024@warthog.procyon.org.uk>
Date:	Tue, 03 May 2016 21:23:44 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 5/6] statx: Make windows attributes available for CIFS, NTFS and FAT to use

Andreas Dilger <adilger@...ger.ca> wrote:

> > 	__u32	st_win_attrs;
> 
> It seems some of these flags are duplicated with the st_information field,
> and some are duplicate with FS_IOC_GETFLAGS values, and returning the same
> information in multiple ways is confusing.
>
> If these flags are part of the CIFS protocol,

They're part of the Windows API.  CIFS/SMB and NTFS have them at the same
values.

> and are directly usable by Samba then I can understand we wouldn't want to
> change them once in the kernel and then convert them back in userspace, but
> I'm a bit reluctant to have flags only for CIFS/NTFS/FAT that might also be
> useful for other filesystems.

Where said "other filesystems" have some support for Windows or OS/2 and have
bits defined that map directly in semantics, if not in value, to these bits.

JFS, for example, has IREADONLY, IHIDDEN, ISYSTEM, IDIRECTORY, IARCHIVE and
ISPARSE.

> Would we want to be able to get translated
> st_win_attrs flags in ext4 attrs when it is being exported by Samba?

Actually, I was thinking of proposing an ext4 patch that stored windows flags
in a separate word in the inode on disk.  There isn't sufficient bit space to
map all the windows flags to FS_IOC_GETFLAGS.  However, as you say, there is a
certain amount of overlap...

David