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Message-Id: <1190830135.30530.32.camel@localhost>
Date: Wed, 26 Sep 2007 11:08:55 -0700
From: Dave Hansen <haveblue@...ibm.com>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
hch@...radead.org
Subject: Re: missing mnt_drop_write() on open error
On Wed, 2007-09-26 at 19:50 +0200, Miklos Szeredi wrote:
> Maybe. Can we do the mnt_want_write() from __dentry_open(), instead
> of may_open()? That would be a lot cleaner.
I'll explore that. It may make very good sense.
> Btw, may_open() doesn't do mnt_want_write() around the truncation if
> file is opened with O_TRUNC | O_RDONLY.
What's the path to may_open() in that case? open_namei() should wrap
all callers other than nfs, and it does:
/* O_TRUNC implies we need access checks for write permissions */
if (flag & O_TRUNC)
acc_mode |= MAY_WRITE;
Which should trigger the may_open() code.
later in open_namei():
...
ok:
error = may_open(nd, acc_mode, flag);
if (error)
goto exit;
return 0;
-- Dave
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