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CONFIG_BLK_DEV_DAX: Block device DAX support

General informations

The Linux kernel configuration item CONFIG_BLK_DEV_DAX:

Help text

When DAX support is available (FS_DAX) raw block devices can also support direct userspace access to the storage capacity via MMAP(2) similar to a file on a DAX-enabled filesystem. However, the DAX I/O-path disables some standard I/O-statistics, and the MMAP(2) path has some operational differences due to bypassing the page cache. If in doubt, say N.

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