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From: Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>
To: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: arnd-r2nGTMty4D4@public.gmane.org,
	linux-afs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 03/12] statx: Add a system call to make enhanced file info available
Date: Wed, 25 Nov 2015 07:21:13 +1100	[thread overview]
Message-ID: <20151124202113.GJ26718@dastard> (raw)
In-Reply-To: <20151120145457.18930.79678.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>

On Fri, Nov 20, 2015 at 02:54:57PM +0000, David Howells wrote:
> The defined bits in st_ioc_flags are the usual FS_xxx_FL, plus some extra
> flags that might be supplied by the filesystem.  Note that Ext4 returns
> flags outside of {EXT4,FS}_FL_USER_VISIBLE in response to FS_IOC_GETFLAGS.
> Should {EXT4,FS}_FL_USER_VISIBLE be extended to cover them?  Or should the
> extra flags be suppressed?

Quite frankly, we should not expose flags owned by a filesystem like
this. Create a new set of flagsi that are exposed by the syscall,
and every filesystem is responsible for translating their internal
flag values to the syscall flag values....

> The defined bits in the st_information field give local system data on a
> file, how it is accessed, where it is and what it does:
> 
> 	STATX_INFO_ENCRYPTED		File is encrypted
> 	STATX_INFO_TEMPORARY		File is temporary (NTFS/CIFS/deleted)
> 	STATX_INFO_FABRICATED		File was made up by filesystem
> 	STATX_INFO_KERNEL_API		File is kernel API (eg: procfs/sysfs)
> 	STATX_INFO_REMOTE		File is remote
> 	STATX_INFO_OFFLINE		File is offline (CIFS)
> 	STATX_INFO_AUTOMOUNT		Dir is automount trigger
> 	STATX_INFO_AUTODIR		Dir provides unlisted automounts
> 	STATX_INFO_NONSYSTEM_OWNERSHIP	File has non-system ownership details
> 	STATX_INFO_REPARSE_POINT	File is reparse point (NTFS/CIFS)

	STATX_INFO_XATTR		File/dir has extended attrs

... just like these STATX_INFO flags are filesystem independent...

And, FWIW, I'd like to see more than one local filesystem supported
in the initial patchset (e.g. btrfs) and also have all their
inode/fs flags exposed so we don't end up encoding weird
ext4-specific feature quirks into the API.....

Cheers,

Dave.
-- 
Dave Chinner
david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org

WARNING: multiple messages have this Message-ID
From: Dave Chinner <david@fromorbit.com>
To: David Howells <dhowells@redhat.com>
Cc: arnd@arndb.de, linux-afs@vger.kernel.org,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	samba-technical@lists.samba.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 03/12] statx: Add a system call to make enhanced file info available
Date: Wed, 25 Nov 2015 07:21:13 +1100	[thread overview]
Message-ID: <20151124202113.GJ26718@dastard> (raw)
In-Reply-To: <20151120145457.18930.79678.stgit@warthog.procyon.org.uk>

On Fri, Nov 20, 2015 at 02:54:57PM +0000, David Howells wrote:
> The defined bits in st_ioc_flags are the usual FS_xxx_FL, plus some extra
> flags that might be supplied by the filesystem.  Note that Ext4 returns
> flags outside of {EXT4,FS}_FL_USER_VISIBLE in response to FS_IOC_GETFLAGS.
> Should {EXT4,FS}_FL_USER_VISIBLE be extended to cover them?  Or should the
> extra flags be suppressed?

Quite frankly, we should not expose flags owned by a filesystem like
this. Create a new set of flagsi that are exposed by the syscall,
and every filesystem is responsible for translating their internal
flag values to the syscall flag values....

> The defined bits in the st_information field give local system data on a
> file, how it is accessed, where it is and what it does:
> 
> 	STATX_INFO_ENCRYPTED		File is encrypted
> 	STATX_INFO_TEMPORARY		File is temporary (NTFS/CIFS/deleted)
> 	STATX_INFO_FABRICATED		File was made up by filesystem
> 	STATX_INFO_KERNEL_API		File is kernel API (eg: procfs/sysfs)
> 	STATX_INFO_REMOTE		File is remote
> 	STATX_INFO_OFFLINE		File is offline (CIFS)
> 	STATX_INFO_AUTOMOUNT		Dir is automount trigger
> 	STATX_INFO_AUTODIR		Dir provides unlisted automounts
> 	STATX_INFO_NONSYSTEM_OWNERSHIP	File has non-system ownership details
> 	STATX_INFO_REPARSE_POINT	File is reparse point (NTFS/CIFS)

	STATX_INFO_XATTR		File/dir has extended attrs

... just like these STATX_INFO flags are filesystem independent...

And, FWIW, I'd like to see more than one local filesystem supported
in the initial patchset (e.g. btrfs) and also have all their
inode/fs flags exposed so we don't end up encoding weird
ext4-specific feature quirks into the API.....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

  parent reply	other threads:[~2015-11-24 20:21 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-20 14:54 [RFC][PATCH 00/12] Enhanced file stat system call David Howells
2015-11-20 14:54 ` [PATCH 01/12] Ext4: Fix extended timestamp encoding and decoding David Howells
     [not found]   ` <20151120145434.18930.89755.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 17:37     ` Andreas Dilger
2015-11-24 17:37       ` Andreas Dilger
2015-11-24 19:36   ` Theodore Ts'o
     [not found]     ` <20151124193646.GA3482-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-24 20:10       ` Arnd Bergmann
2015-11-24 20:10         ` Arnd Bergmann
2015-11-29  2:45         ` Theodore Ts'o
2015-11-29  2:45           ` Theodore Ts'o
     [not found]           ` <20151129024555.GA31968-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-29 21:30             ` Arnd Bergmann
2015-11-29 21:30               ` Arnd Bergmann
2015-11-30 14:16               ` Theodore Ts'o
     [not found]                 ` <20151130141605.GA4316-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2015-11-30 14:37                   ` Arnd Bergmann
2015-11-30 14:37                     ` Arnd Bergmann
2015-11-30 14:46                 ` Elmar Stellnberger
2015-11-26 15:28       ` David Howells
2015-11-26 15:28         ` David Howells
2015-11-20 14:54 ` [PATCH 02/12] statx: Provide IOC flags for Windows fs attributes David Howells
     [not found]   ` <20151120145447.18930.5308.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 19:52     ` Theodore Ts'o
2015-11-24 19:52       ` Theodore Ts'o
2015-11-26 15:35   ` David Howells
     [not found]   ` <7976.1448552129-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-26 16:01     ` David Howells
2015-11-26 16:01       ` David Howells
2015-11-26 22:10     ` Andreas Dilger
2015-11-26 22:10       ` Andreas Dilger
2015-11-20 14:54 ` [PATCH 03/12] statx: Add a system call to make enhanced file info available David Howells
     [not found]   ` <20151120145457.18930.79678.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-24 20:21     ` Dave Chinner [this message]
2015-11-24 20:21       ` Dave Chinner
2015-12-04 12:06     ` Pavel Machek
2015-12-04 12:06       ` Pavel Machek
2015-12-21 23:21   ` David Howells
2015-11-20 14:55 ` [PATCH 04/12] statx: AFS: Return enhanced file attributes David Howells
2015-11-20 14:55 ` [PATCH 05/12] statx: Ext4: " David Howells
2015-11-20 14:55 ` [PATCH 06/12] statx: NFS: " David Howells
2015-11-20 14:55 ` [PATCH 07/12] statx: CIFS: Return enhanced attributes David Howells
2015-11-24 17:33   ` Steve French
2015-11-24 17:34   ` Steve French
2015-11-24 17:34     ` Steve French
2015-11-20 14:56 ` [PATCH 08/12] fsinfo: Add a system call to make enhanced filesystem info available David Howells
2015-11-20 14:56 ` [PATCH 09/12] fsinfo: Ext4: Return information through the filesystem info syscall David Howells
2015-11-20 14:56 ` [PATCH 10/12] fsinfo: AFS: " David Howells
2015-11-20 14:56 ` [PATCH 11/12] fsinfo: NFS: " David Howells
     [not found] ` <20151120145422.18930.72662.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-20 14:56   ` [PATCH 12/12] fsinfo: CIFS: " David Howells
2015-11-20 14:56     ` David Howells
2015-11-24  8:11   ` [RFC][PATCH 00/12] Enhanced file stat system call Christoph Hellwig
2015-11-24  8:11     ` Christoph Hellwig
2015-11-20 16:19 ` Martin Steigerwald
2015-11-24  8:13   ` Christoph Hellwig
2015-11-24  8:48     ` Martin Steigerwald
2015-11-24  8:50       ` Christoph Hellwig
2015-11-20 16:28 ` David Howells
2015-11-20 16:28   ` David Howells
2015-11-20 16:35   ` Martin Steigerwald
     [not found]   ` <4495.1448036915-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2015-11-25 17:51     ` J. Bruce Fields
2015-11-25 17:51       ` J. Bruce Fields
     [not found]       ` <20151125175153.GA30335-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2015-11-25 19:30         ` Andreas Dilger
2015-11-25 19:30           ` Andreas Dilger
2015-11-20 16:50 ` Casey Schaufler
     [not found]   ` <564F4F4E.8060603-iSGtlc1asvQWG2LlvL+J4A@public.gmane.org>
2015-11-24  8:15     ` Christoph Hellwig
2015-11-24  8:15       ` Christoph Hellwig
2015-11-24 14:43       ` Casey Schaufler
2015-11-24 16:28   ` Andreas Dilger
2015-11-26 15:19 ` David Howells
2015-11-26 22:06   ` Andreas Dilger

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