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block: assert blk_iou_cmd fits in the io_uring_cmd PDU #1012

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block: assert blk_iou_cmd fits in the io_uring_cmd PDU #1012

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5 changes: 5 additions & 0 deletions block/ioctl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -856,12 +856,17 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
}
#endif

/*
* Per-command block io_uring PDU stored in io_uring_cmd.pdu[32].
* Holds discard state between submission, completion and task work.
*/
struct blk_iou_cmd {
u64 start;
u64 len;
int res;
bool nowait;
};
static_assert(sizeof(struct blk_iou_cmd) <= sizeof_field(struct io_uring_cmd, pdu));

static void blk_cmd_complete(struct io_tw_req tw_req, io_tw_token_t tw)
{
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