While conceptually possible, we do not allow setting EXT4_DAX_FL while at the same time clearing exclusion flags (or vice versa) for 2 reasons: 1) The DAX flag does not take effect immediately which introduces quite a bit of complexity 2) There is no clear use case for being this ...
ext4 and XFS file systems now support DAX Starting with Red Hat Enterprise Linux 7.3, Direct Access (DAX) provides, as a Technology Preview, a means for an application to directly map persistent memory into its address space. To use DAX, a system must have some form of persistent memory av...
#define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ #else #define EXT4_MOUNT_DAX 0 #define EXT4_MOUNT_DAX_ALWAYS 0 #endif #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ #define EXT4_MOUNT_JOURNAL_DATA...