{"id":604,"date":"2011-08-10T23:23:00","date_gmt":"2011-08-10T15:23:00","guid":{"rendered":"http:\/\/blog.dynox.cn\/?p=604"},"modified":"2011-08-10T23:23:00","modified_gmt":"2011-08-10T15:23:00","slug":"vpb%e7%9a%84%e6%9d%a5%e9%be%99%e5%8e%bb%e8%84%89%ef%bc%88%e4%ba%8c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/blog.dynox.cn\/?p=604","title":{"rendered":"VPB\u7684\u6765\u9f99\u53bb\u8109\uff08\u4e8c\uff09"},"content":{"rendered":"

VPB\u5168\u5c40\u9501:<\/strong><\/font><\/p>

\u4e3a\u4e86\u4fdd\u62a4\u5bf9\u6240\u6709VPB\u6210\u5458\u7684\u8bbf\u95ee\uff0cI\/O Manager\u7528\u5230\u4e86\u4e00\u4e2a\u5168\u5c40\u7684spinlock\uff1a<\/font><\/p>

0: kd> x nt!IopVpbSpinLock
fffff800`01af7640 nt!IopVpbSpinLock = <no type information><\/p>

\u8fd9\u4e2a\u5168\u5c40spinlock\u5e76\u4e0d\u80fd\u4e3a\u7cfb\u7edf\u9a71\u52a8\u6240\u76f4\u63a5\u5f15\u7528\uff08\u6ca1\u6709export\u51fa\u6765\uff09\uff0c\u6240\u4ee5I\/O Manager\u63d0\u4f9b\u4e86\u4e24\u4e2a\u652f\u6301\u51fd\u6570\uff08\u4e3b\u8981\u662f\u4e3a\u6587\u4ef6\u7cfb\u7edf\u9a71\u52a8\u6240\u7528\uff09:<\/font><\/p>

VOID
IoAcquireVpbSpinLock(
    OUT PKIRQL Irql
    );<\/p>

VOID 
IoReleaseVpbSpinLock(
    IN KIRQL  Irql
    );<\/p>

\u6240\u6709\u5bf9VPB\u6210\u5458\u7684\u8bbf\u95ee\u53ca\u4fee\u6539\u90fd\u8981\u5728\u83b7\u53d6VPB\u9501\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\uff0c\u65e0\u8bba\u662fI\/O Manager\u8fd8\u662f\u6587\u4ef6\u7cfb\u7edf\u9a71\u52a8\u90fd\u8981\u9075\u5b88\u3002<\/font><\/p>

\u4f46\u7531\u4e8eVPB spinlock\u662f\u4e2a\u5168\u5c40\u9501\uff0c\u4e00\u65e6\u88ab\u83b7\u53d6\uff0c\u540e\u7eed\u6240\u6709\u7684\u6253\u5f00\u6216\u521b\u5efa\u6587\u4ef6\u64cd\u4f5c\uff08\u5305\u62ec\u5728\u5176\u5b83\u6587\u4ef6\u7cfb\u7edf\u5377\u4e0a\u7684\uff09\u90fd\u5c06\u88ab\u963b\u6b62\uff0c\u6240\u4ee5\u6301\u6709\u6b64\u9501\u7684\u65f6\u95f4\u4e0d\u5b9c\u8fc7\u957f\uff0c\u5fc5\u987b\u5c3d\u53ef\u80fd\u5feb\u5730\u91ca\u653e\u3002<\/font><\/p>

\u5173\u4e8eIoAcquireVpbSpinLock()\u53caIoReleaseVpbSpinLock()\u7684\u5185\u90e8\u5b9e\u73b0\uff0c\u4eceXP\u4ee5\u540e\u572864\u4f4d\u7684\u7cfb\u7edf\u4e0a\uff0cI\/O Manager\u7528\u5f97\u662fQueued SpinLock\u673a\u5236\uff0c\u6709\u5174\u8da3\u5730\u8bdd\u4e0d\u59a8\u81ea\u5df1\u52a8\u624b\u53bb\u63a2\u7d22\u4e00\u4e0b\u7a76\u7adf\u3002<\/font><\/p>

VPB\u7684\u5f15\u7528\u53ca\u591a\u5934\u7ba1\u7406(Distributed Management)<\/strong><\/font>:<\/strong><\/font><\/p>

VPB\u662f\u9760ReferenceCount\u6765\u7ba1\u7406\u5176\u751f\u5b58\u5468\u671f\u7684\uff0c\u4efb\u4f55\u5bf9\u8bbe\u5907\u5377\u7684\u8bbf\u95ee\u90fd\u4f1a\u4ea7\u751f\u5bf9\u6b64VPB\u7684\u8ba1\u6570\u5f15\u7528\u3002<\/font><\/p>

\u6700\u4e3b\u8981\u7684\u5f15\u7528\u64cd\u4f5c\u90fd\u5728Naming Parsing\u9636\u6bb5\uff0c\u5373IopParseDevice()\u51fd\u6570\u4e2d\u3002IopParseDevice()\u51fd\u6570\u662fI\/O Manager\u5411\u5bf9\u8c61\u7ba1\u7406\u5668\uff08Object Manager\uff09\u6ce8\u518c\u7684\u201cDevice\u201d\u4e00\u7c7b\u5bf9\u8c61\u7684\u540d\u79f0\u89e3\u6790\u56de\u8c03\u51fd\u6570\uff08Parse Procedure\uff09\uff0c\u8fd9\u90e8\u5206\u4f1a\u5728\u4ee5\u540e\u4ecb\u7ecd\u201cName Parsing\u201d\u65f6\u518d\u505a\u8be6\u8ff0\uff0c\u5728\u6b64\u5148\u884c\u7565\u8fc7\u3002<\/font><\/p>

IopParseDevice()\u5728\u89e3\u6790\u5230\u5377\u8bbe\u5907\u7684DeviceObject\u4ee5\u540e\uff0c\u4f1a\u8c03\u7528IopCheckVpbMounted()\u6765\u68c0\u67e5\u6b64\u5377\u8bbe\u5907\u662f\u4e0d\u662f\u5df2\u6302\u8f7d\u6587\u4ef6\u7cfb\u7edf\u3002IopCheckVpbMounted()\u4f1a\u505a\u4ee5\u4e0b\u7684\u4e8b\u60c5\uff1a<\/font><\/p>