[PATCH] hibernate: Allow uswsusp to write to swap

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From: Domenico Andreoli <domenico.andreoli@xxxxxxxxx>

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@xxxxxxxxx>
Reported-by: Marian Klein <mkleinsoft@xxxxxxxxx>
Signed-off-by: Domenico Andreoli <domenico.andreoli@xxxxxxxxx>

---
 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))



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