From: Linus Torvalds <torvalds@linux-foundation.org>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Dave Chinner <david@fromorbit.com>,
linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fsdevel@vger.kernel.org, hch@infradead.org,
warthog9@kernel.org, jmorris@namei.org, kyle@mcmartin.ca,
hpa@zytor.com, akpm@linux-foundation.org, mingo@elte.hu,
eparis@redhat.com, viro@zeniv.linux.org.uk,
Matthew Wilcox <matthew@wil.cx>
Subject: Re: [PATCH 0/4] IMA: making i_readcount a first class inode citizen
Date: Thu, 28 Oct 2010 15:46:04 -0700 [thread overview]
Message-ID: <AANLkTimvEAj2SL7RrwTdypGA_PYJcZyw8OMBGckWpVs7@mail.gmail.com> (raw)
In-Reply-To: <1288305510.2610.13.camel@localhost.localdomain>
On Thu, Oct 28, 2010 at 3:38 PM, Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
>
> Would making i_readcount atomic be enough in ima_rdwr_violation_check(),
> or would it still need to take the spin_lock? IMA needs guarantees
> that the i_readcount/i_writecount won't be updated in between.
If i_writecount is always updated under the i_lock, then the fix is
probably to make that one non-atomic instead. There's no point in
having an atomic that is always updated under a spinlock, that just
makes everything slower.
Regardless, I don't think i_readcount should be different from i_writecount.
Al? Comments?
Linus
next prev parent reply other threads:[~2010-10-28 22:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-28 22:02 [PATCH 0/4] IMA: making i_readcount a first class inode citizen Mimi Zohar
2010-10-28 22:02 ` [PATCH 1/4] IMA: define readcount functions Mimi Zohar
2010-10-28 22:02 ` [PATCH 2/4] IMA: maintain i_readcount in the VFS layer Mimi Zohar
2010-10-29 14:13 ` Valdis.Kletnieks
2010-10-29 15:15 ` Valdis.Kletnieks
2010-10-28 22:02 ` [PATCH 3/4] IMA: remove IMA imbalance checking Mimi Zohar
2010-10-28 22:02 ` [PATCH 4/4] IMA: making i_readcount a first class inode citizen Mimi Zohar
2010-10-28 22:24 ` [PATCH 0/4] " Dave Chinner
2010-10-28 22:29 ` Linus Torvalds
2010-10-28 22:38 ` Mimi Zohar
2010-10-28 22:46 ` Linus Torvalds [this message]
2010-10-28 23:25 ` Al Viro
2010-10-28 22:45 ` Eric Paris
2010-10-29 0:30 ` Mimi Zohar
2010-11-06 10:44 ` Pavel Machek
2010-11-05 1:12 ` J. Bruce Fields
2010-11-05 11:08 ` Mimi Zohar
2010-11-05 16:28 ` J. Bruce Fields
2010-11-05 17:38 ` Mimi Zohar
2010-11-05 19:08 ` J. Bruce Fields
2010-11-05 20:58 ` J. Bruce Fields
2010-11-07 0:03 ` Mimi Zohar
-- strict thread matches above, loose matches on Subject: below --
2011-02-14 20:29 Mimi Zohar
2011-02-16 23:08 ` Mimi Zohar
2011-02-17 1:46 ` James Morris
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