[dm-devel] does file system page cache work after device mapping?

[zhiming shen]

Hi everyone, I have some questions regarding to the mechanism of device
mapper: After the device mapper layer gets the mapping information, it will
issue IO request to the real device. How does it perform IO operation at
this stage? For example, if the device is a block device, will it go to the
page cache and check whether the desired block is in cache? If the block is
not in cache and it read from the physical device, will the block be cached
in memory?

Thanks very much!


Zhiming
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