On Fri, Sep 14, 2018 at 08:51:13AM -0600, Toshi Kani wrote:
Sync syscall to DAX file needs to flush processor cache, but it currently does not flush to existing DAX files. This is because 'ext4_da_aops' is set to address_space_operations of existing DAX files, instead of 'ext4_dax_aops', since S_DAX flag is set after ext4_set_aops() in the open path.
New file
lookup_open ext4_create __ext4_new_inode ext4_set_inode_flags // Set S_DAX flag ext4_set_aops // Set aops to ext4_dax_aops
Existing file
lookup_open ext4_lookup ext4_iget ext4_set_aops // Set aops to ext4_da_aops ext4_set_inode_flags // Set S_DAX flag
Change ext4_iget() to initialize i_flags before ext4_set_aops().
Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops") Signed-off-by: Toshi Kani toshi.kani@hpe.com Suggested-by: Jan Kara jack@suse.cz Cc: Jan Kara jack@suse.cz Cc: Dan Williams dan.j.williams@intel.com Cc: "Theodore Ts'o" tytso@mit.edu Cc: Andreas Dilger adilger.kernel@dilger.ca Cc: stable@vger.kernel.org
Thanks, applied.
- Ted