I noticed that both ext4_da_aops and ext4_dax_aops are used on DAX
mounted ext4 files. Looking at 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
So, we set ext4_da_aops for existing files since S_DAX flag is set after
ext4_set_aops().
Thanks,
-Toshi
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