doc: update a header file about bdev programming guide
The header file include/io_channel.h no longer exists. Message passing infrastructure now is abstracted by thead.h. Change-Id: I2fd6826d614ef5910787477eed75e81449625241 Signed-off-by: WangHaiLiang <hailiangx.e.wang@intel.com> Reviewed-on: https://review.gerrithub.io/436118 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Liang Yan <liang.z.yan@intel.com>
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@ -48,7 +48,7 @@ to as virtual bdevs, or *vbdevs* for short.
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## Initializing The Library
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The bdev layer depends on the generic message passing infrastructure
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abstracted by the header file include/io_channel.h. See @ref concurrency for a
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abstracted by the header file include/spdk/thread.h. See @ref concurrency for a
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full description. Most importantly, calls into the bdev library may only be
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made from threads that have been allocated with SPDK by calling
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spdk_allocate_thread().
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