From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: akpm@linux-foundation.org, tytso@mit.edu,
viro@zeniv.linux.org.uk, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 2/2] vfs: don't allow writes to swap files
Date: Thu, 15 Aug 2019 23:48:58 -0700 [thread overview]
Message-ID: <20190816064858.GG15186@magnolia> (raw)
In-Reply-To: <20190816064121.GB2024@infradead.org>
On Thu, Aug 15, 2019 at 11:41:21PM -0700, Christoph Hellwig wrote:
> The new checks look fine to me, but where does the inode_drain_writes()
> function come from, I can't find that in my tree anywhere.
Doh. Forgot to include that patch in the series. :(
/*
* Flush file data before changing attributes. Caller must hold any locks
* required to prevent further writes to this file until we're done setting
* flags.
*/
static inline int inode_drain_writes(struct inode *inode)
{
inode_dio_wait(inode);
return filemap_write_and_wait(inode->i_mapping);
}
> Also what does inode_drain_writes do about existing shared writable
> mapping? Do we even care about that corner case?
We probably ought to flush and invalidate the pagecache for the entire
file so that page_mkwrite can bounce off the swapfile.
--D
next prev parent reply other threads:[~2019-08-16 6:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-15 16:05 [PATCH v3 0/2] vfs: make active swap files unwritable Darrick J. Wong
2019-08-15 16:05 ` [PATCH 1/2] mm: set S_SWAPFILE on blockdev swap devices Darrick J. Wong
2019-08-16 6:39 ` Christoph Hellwig
2019-08-15 16:05 ` [PATCH 2/2] vfs: don't allow writes to swap files Darrick J. Wong
2019-08-16 6:41 ` Christoph Hellwig
2019-08-16 6:48 ` Darrick J. Wong [this message]
2019-08-16 16:19 ` [PATCH v2 " Darrick J. Wong
2019-08-18 8:39 ` Christoph Hellwig
2019-08-15 16:34 ` [PATCH RFC 3/2] fstests: check that we can't write " Darrick J. Wong
2019-08-15 21:26 ` Andrew Morton
2019-08-16 2:13 ` Darrick J. Wong
2019-08-17 2:05 ` [PATCH v2 " Darrick J. Wong
-- strict thread matches above, loose matches on Subject: below --
2019-06-28 18:35 [PATCH v2 0/2] vfs: make active swap files unwritable Darrick J. Wong
2019-06-28 18:35 ` [PATCH 2/2] vfs: don't allow writes to swap files Darrick J. Wong
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