The patch titled
Subject: mm, swap: disallow swapon() on zoned block devices
has been removed from the -mm tree. Its filename was
mm-swap-disallow-swapon-on-zoned-block-devices.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Naohiro Aota <naohiro.aota@xxxxxxx>
Subject: mm, swap: disallow swapon() on zoned block devices
A zoned block device consists of a number of zones. Zones are either
conventional and accepting random writes or sequential and requiring that
writes be issued in LBA order from each zone write pointer position. For
the write restriction, zoned block devices are not suitable for a swap
device. Disallow swapon on them.
[akpm@xxxxxxxxxxxxxxxxxxxx: reflow and reword comment, per Christoph]
Link: http://lkml.kernel.org/r/20191015085814.637837-1-naohiro.aota@xxxxxxx
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: "Theodore Y. Ts'o" <tytso@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swapfile.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/mm/swapfile.c~mm-swap-disallow-swapon-on-zoned-block-devices
+++ a/mm/swapfile.c
@@ -2887,6 +2887,13 @@ static int claim_swapfile(struct swap_in
error = set_blocksize(p->bdev, PAGE_SIZE);
if (error < 0)
return error;
+ /*
+ * Zoned block devices contain zones that have a sequential
+ * write only restriction. Hence zoned block devices are not
+ * suitable for swapping. Disallow them here.
+ */
+ if (blk_queue_is_zoned(p->bdev->bd_queue))
+ return -EINVAL;
p->flags |= SWP_BLKDEV;
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
_
Patches currently in -mm which might be from naohiro.aota@xxxxxxx are
