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lightnvm: pblk: protect line bitmap while submitting meta io
[ Upstream commit e57903fd97
]
It seems pblk_dealloc_page would race against pblk_alloc_pages for
line bitmap for sector allocation.The chances are very low but might
as well protect the bitmap properly.
Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -486,12 +486,14 @@ void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
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u64 addr;
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int i;
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spin_lock(&line->lock);
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addr = find_next_zero_bit(line->map_bitmap,
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pblk->lm.sec_per_line, line->cur_sec);
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line->cur_sec = addr - nr_secs;
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for (i = 0; i < nr_secs; i++, line->cur_sec--)
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WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
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spin_unlock(&line->lock);
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}
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u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
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