ext4, dax: set ext4_dax_aops for dax files
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: 5f0663bb ("ext4, dax: introduce ext4_dax_aops") Signed-off-by: NToshi Kani <toshi.kani@hpe.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Suggested-by: NJan Kara <jack@suse.cz> Cc: stable@vger.kernel.org
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