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mm, swap: use SWP_SOLIDSTATE to determine if swap is rotational

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The current non rotational check is unreliable as the device's rotational
status can be changed by a user via sysfs.

Use the more reliable SWP_SOLIDSTATE flag which is set at swapon time, to
ensure the nr_rotate_swap count remains consistent.  Plus, it is easy to
read and simple.

Link: https://lkml.kernel.org/r/20251031065011.40863-3-youngjun.park@lge.com
Fixes: 81a0298bdf ("mm, swap: don't use VMA based swap readahead if HDD is used as swap")
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Youngjun Park
2025-10-31 15:50:08 +09:00
committed by Andrew Morton
parent cb65082a0a
commit 68f78bf55b
1 changed files with 1 additions and 1 deletions
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2
mm/swapfile.c
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@@ -2910,7 +2910,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
if (p->flags & SWP_CONTINUED)
free_swap_count_continuations(p);
if (!p->bdev || !bdev_nonrot(p->bdev))
if (!(p->flags & SWP_SOLIDSTATE))
atomic_dec(&nr_rotate_swap);
mutex_lock(&swapon_mutex);