null_blk: synchronization fix for zoned device
Parallel write,read,zone-mgmt operations accessing/altering zone state and write-pointer may get into race. Avoid the situation by using a new spinlock for zoned device. Concurrent zone-appends (on a zone) returning same write-pointer issue is also avoided using this lock. Cc: stable@vger.kernel.org Fixes: e0489ed5 ("null_blk: Support REQ_OP_ZONE_APPEND") Signed-off-by: NKanchan Joshi <joshi.k@samsung.com> Reviewed-by: NDamien Le Moal <damien.lemoal@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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