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| /freebsd-11-stable/sys/cam/ctl/ | ||
| H A D | ctl_backend_block.c | diff 269123 Sat Jul 26 12:00:24 MDT 2014 mav Implement separate I/O dispatch method for ZVOLs in "dev" mode. Unlike disk devices ZVOLs process all requests synchronously. That makes impossible sending multiple requests to them from single thread. From the other side ZVOLs have real d_read/d_write methods, which unlike d_strategy can handle uio scatter/gather and have no strict I/O size limitations. So, if ZVOL in "dev" mode is detected, use of d_read/d_write methods instead of d_strategy allows to avoid pointless splitting of large requests into MAXPHYS (128K) sized chunks. MFC after: 1 week |
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