Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory support.

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To: Benjamin Thery <benjamin.thery@...>
Cc: Greg Kroah-Hartman <gregkh@...>, Andrew Morton <akpm@...>, Eric Biederman <ebiederm@...>, Daniel Lezcano <dlezcano@...>, Serge Hallyn <serue@...>, <linux-kernel@...>, Al Viro <viro@...>, Linux Containers <containers@...>
Date: Sunday, June 22, 2008 - 10:05 pm

Hello,


As only directories can be tagged, I suppose handling tags explicitly
isn't necessary here, right?  Can we please add a comment explaning
that?


Taking both @kobj and @dir_sd is ugly but it isn't your fault.  I'll
clean things up later.


As before, I can't bring myself to like this interface.  Is computing
tags dynamically really necessary?  Can't we do the followings?

tag = sysfs_allocate_tag(s);
sysfs_enable_tag(kobj (or sd), tag);
sysfs_sb_show_tag(sb, tag);

Where tags are allocated using ida and each sb has bitmap of enabled
tags so that sysfs ops can simply use something like the following to
test whether it's enabled.

bool sysfs_tag_enabled(sb, tag)
{
	return sysfs_info(sb)->tag_map & (1 << tag);
}

Tags which can change dynamically seems too confusing to me and it
makes things difficult to verify as it's unclear how those tags are
gonna to change.

Thanks.

-- 
tejun
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Messages in current thread:
Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory su..., Tejun Heo, (Sun Jun 22, 10:05 pm)
Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory su..., Eric W. Biederman, (Thu Jun 26, 4:21 pm)
Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory su..., Eric W. Biederman, (Mon Jun 30, 2:56 pm)
Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory su..., Eric W. Biederman, (Tue Jul 1, 11:53 pm)
Re: [PATCH 06/11] sysfs: Implement sysfs tagged directory su..., Eric W. Biederman, (Wed Jul 2, 12:49 pm)
[PATCH 00/15] sysfs support for namespaces, Eric W. Biederman, (Thu Jul 3, 8:48 pm)
Re: [PATCH 00/15] sysfs support for namespaces, Eric W. Biederman, (Sun Jul 6, 12:42 am)
Re: [PATCH 00/15] sysfs support for namespaces, Cornelia Huck, (Mon Jul 7, 7:41 am)
Re: [PATCH 00/15] sysfs support for namespaces, Eric W. Biederman, (Mon Jul 7, 8:22 am)
Re: [PATCH 00/15] sysfs support for namespaces, Eric W. Biederman, (Thu Jul 3, 9:27 pm)
[PATCH 02/15] sysfs: Support for preventing unmounts., Eric W. Biederman, (Thu Jul 3, 9:07 pm)
[PATCH 03/15] sysfs: sysfs_get_dentry add a sb parameter, Eric W. Biederman, (Thu Jul 3, 9:08 pm)
[PATCH 04/15] sysfs: Implement __sysfs_get_dentry, Eric W. Biederman, (Thu Jul 3, 9:09 pm)
[PATCH 05/15] sysfs: Rename Support multiple superblocks, Eric W. Biederman, (Thu Jul 3, 9:10 pm)
[PATCH 06/15] Introduce sysfs_sd_setattr and fix sysfs_chmod, Eric W. Biederman, (Thu Jul 3, 9:11 pm)
[PATCH 08/15] sysfs: Make sysfs_mount static once again., Eric W. Biederman, (Thu Jul 3, 9:14 pm)
[PATCH 0/8] sysfs namespace support, Eric W. Biederman, (Thu Aug 21, 2:31 am)
[PATCH 1/8] sysfs: Implement sysfs tagged directory support., Eric W. Biederman, (Thu Aug 21, 2:33 am)
Re: [PATCH 1/8] sysfs: Implement sysfs tagged directory supp..., Eric W. Biederman, (Mon Oct 13, 11:20 pm)
[PATCH 2/8] sysfs: Merge sysfs_rename_dir and sysfs_move_dir, Eric W. Biederman, (Thu Aug 21, 2:34 am)
[PATCH 3/8] sysfs: Implement sysfs_delete_link and sysfs_ren..., Eric W. Biederman, (Thu Aug 21, 2:35 am)
[PATCH 4/8] driver core: Implement tagged directory support ..., Eric W. Biederman, (Thu Aug 21, 2:37 am)
[PATCH 5/8] sysfs: Remove sysfs_create_link_nowarn, Eric W. Biederman, (Thu Aug 21, 2:36 am)
[PATCH 6/8] Revert "netns: Fix device renaming for sysfs", Eric W. Biederman, (Thu Aug 21, 2:38 am)
[PATCH 7/8] netns: Enable tagging for net_class directories ..., Eric W. Biederman, (Thu Aug 21, 2:39 am)
[PATCH 8/8] sysfs: user namespaces: fix bug with clone(CLONE..., Eric W. Biederman, (Thu Aug 21, 2:40 am)
Re: [PATCH 0/8] sysfs namespace support, David Miller, (Thu Aug 21, 2:37 am)
Re: [PATCH 09/15] sysfs: Implement sysfs tagged directory su..., Eric W. Biederman, (Wed Aug 20, 2:58 am)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Sun Jul 13, 9:54 pm)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Fri Jul 18, 4:19 pm)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Wed Jul 16, 1:41 am)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Wed Jul 16, 2:32 am)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Wed Jul 16, 5:09 pm)
Re: [PATCH 12/15] driver core: Implement tagged directory su..., Eric W. Biederman, (Wed Jul 16, 3:07 pm)
[PATCH 13/15] Revert "netns: Fix device renaming for sysfs", Eric W. Biederman, (Thu Jul 3, 9:21 pm)