* i_flags locking
@ 2007-06-25 16:42 Jan Kara
2007-06-30 9:30 ` Christoph Hellwig
0 siblings, 1 reply; 2+ messages in thread
From: Jan Kara @ 2007-06-25 16:42 UTC (permalink / raw)
To: linux-fsdevel
Hi,
I came across the following question: What is the proper locking for
using i_flags? I've noticed i_flags are read freely without any lock.
The modifications I've seen e.g. in ext3 were done under i_mutex. Is this
right?
BTW it means that when checking i_flags we can see intermediate states
in ext3_set_inode_flags() when all flags are cleared and the proper flags
are not yet set, right?
I'm currently playing with something like inotify for subtree and I'd
need to modify i_flags but using i_mutex unpleasantly interferes with
directory locking...
Honza
--
Jan Kara <jack@suse.cz>
SuSE CR Labs
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: i_flags locking
2007-06-25 16:42 i_flags locking Jan Kara
@ 2007-06-30 9:30 ` Christoph Hellwig
0 siblings, 0 replies; 2+ messages in thread
From: Christoph Hellwig @ 2007-06-30 9:30 UTC (permalink / raw)
To: Jan Kara; +Cc: linux-fsdevel
On Mon, Jun 25, 2007 at 06:42:44PM +0200, Jan Kara wrote:
> Hi,
>
> I came across the following question: What is the proper locking for
> using i_flags? I've noticed i_flags are read freely without any lock.
> The modifications I've seen e.g. in ext3 were done under i_mutex. Is this
> right?
> BTW it means that when checking i_flags we can see intermediate states
> in ext3_set_inode_flags() when all flags are cleared and the proper flags
> are not yet set, right?
> I'm currently playing with something like inotify for subtree and I'd
> need to modify i_flags but using i_mutex unpleasantly interferes with
> directory locking...
i_lock?
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-06-25 16:42 i_flags locking Jan Kara
2007-06-30 9:30 ` Christoph Hellwig
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