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loop-util: close lock fd before trying LOOP_CLR_FD in failure path
If the loopback device is open more than once LOOP_CLR_FD will fail, hence close the lock fd first explicitly, so there's definitely only one fd left.
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@ -341,6 +341,9 @@ success:
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return 0;
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fail:
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/* Close the lock fd explicitly before clearing the loopback block device, since an additional open
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* fd would block the clearing to succeed */
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lock_fd = safe_close(lock_fd);
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(void) ioctl(fd, LOOP_CLR_FD);
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return r;
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}
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