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md/md-llbitmap: raise barrier before state machine transition

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Move the barrier raise operation before calling llbitmap_state_machine()
in both llbitmap_start_write() and llbitmap_start_discard(). This
ensures the barrier is in place before any state transitions occur,
preventing potential race conditions where the state machine could
complete before the barrier is properly raised.

Cc: stable@vger.kernel.org
Fixes: 5ab829f197 ("md/md-llbitmap: introduce new lockless bitmap")
Link: https://lore.kernel.org/linux-raid/20260223024038.3084853-3-yukuai@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
This commit is contained in:
Yu Kuai 2026-02-23 10:40:35 +08:00
parent 7701e68b50
commit ef4ca3d4bf
1 changed files with 4 additions and 4 deletions
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8
drivers/md/md-llbitmap.c
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@ -1070,12 +1070,12 @@ static void llbitmap_start_write(struct mddev *mddev, sector_t offset,
int page_start = (start + BITMAP_DATA_OFFSET) >> PAGE_SHIFT;
int page_end = (end + BITMAP_DATA_OFFSET) >> PAGE_SHIFT;
llbitmap_state_machine(llbitmap, start, end, BitmapActionStartwrite);
while (page_start <= page_end) {
llbitmap_raise_barrier(llbitmap, page_start);
page_start++;
}
llbitmap_state_machine(llbitmap, start, end, BitmapActionStartwrite);
}
static void llbitmap_end_write(struct mddev *mddev, sector_t offset,
@ -1102,12 +1102,12 @@ static void llbitmap_start_discard(struct mddev *mddev, sector_t offset,
int page_start = (start + BITMAP_DATA_OFFSET) >> PAGE_SHIFT;
int page_end = (end + BITMAP_DATA_OFFSET) >> PAGE_SHIFT;
llbitmap_state_machine(llbitmap, start, end, BitmapActionDiscard);
while (page_start <= page_end) {
llbitmap_raise_barrier(llbitmap, page_start);
page_start++;
}
llbitmap_state_machine(llbitmap, start, end, BitmapActionDiscard);
}
static void llbitmap_end_discard(struct mddev *mddev, sector_t offset,