From: Domenico Andreoli <domenico.andreoli@linux.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Linux PM <linux-pm@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-fsdevel@vger.kernel.org, mkleinsoft@gmail.com,
Christoph Hellwig <hch@lst.de>,
Andrew Morton <akpm@linux-foundation.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>
Subject: [PATCH] hibernate: Allow uswsusp to write to swap
Date: Wed, 4 Mar 2020 09:23:27 +0100 [thread overview]
Message-ID: <20200304082327.GA14236@dumbo> (raw)
In-Reply-To: <20200304011840.GD1752567@magnolia>
From: Domenico Andreoli <domenico.andreoli@linux.com>
It turns out that there is one use case for programs being able to
write to swap devices, and that is the userspace hibernation code.
Quick fix: disable the S_SWAPFILE check if hibernation is configured.
Fixes: 1638045c3677 ("mm: set S_SWAPFILE on blockdev swap devices")
Reported-by: Domenico Andreoli <domenico.andreoli@linux.com>
Reported-by: Marian Klein <mkleinsoft@gmail.com>
Signed-off-by: Domenico Andreoli <domenico.andreoli@linux.com>
---
fs/block_dev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: b/fs/block_dev.c
===================================================================
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -2001,7 +2001,8 @@ ssize_t blkdev_write_iter(struct kiocb *
if (bdev_read_only(I_BDEV(bd_inode)))
return -EPERM;
- if (IS_SWAPFILE(bd_inode))
+ /* uswsusp needs to write to the swap */
+ if (IS_SWAPFILE(bd_inode) && !IS_ENABLED(CONFIG_HIBERNATION))
return -ETXTBSY;
if (!iov_iter_count(from))
next prev parent reply other threads:[~2020-03-04 8:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-29 17:08 [PATCH] hibernate: unlock swap bdev for writing when uswsusp is active Darrick J. Wong
2020-02-29 18:07 ` Domenico Andreoli
2020-02-29 18:38 ` Darrick J. Wong
2020-02-29 20:02 ` Domenico Andreoli
2020-03-01 21:35 ` Rafael J. Wysocki
2020-03-02 4:51 ` Marian Klein
2020-03-03 19:02 ` Darrick J. Wong
2020-03-03 22:51 ` Domenico Andreoli
2020-03-04 1:18 ` Darrick J. Wong
2020-03-04 8:23 ` Domenico Andreoli [this message]
2020-03-04 15:45 ` [PATCH] hibernate: Allow uswsusp to write to swap Darrick J. Wong
2020-03-04 16:31 ` Domenico Andreoli
2020-03-04 8:34 ` [PATCH] hibernate: unlock swap bdev for writing when uswsusp is active Domenico Andreoli
2020-04-20 18:52 ` Domenico Andreoli
2020-04-21 15:43 ` Darrick J. Wong
2020-04-21 18:39 ` Domenico Andreoli
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