The last patch is what started the series: XFS currently uses the direct I/O locking strategy for DAX because DAX was overloaded onto the direct I/O path. For XFS this means that we only take a shared inode lock instead of the normal exclusive one for writes IFF they are properly aligned. While this is fine for O_DIRECT which requires explicit opt-in from the application it's not fine for DAX where we'll suddenly lose expected and required synchronization of the file system happens to use DAX undeneath.
Patches 1-7 just untangle the code so that we can deal with DAX on it's own easily. _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
