f2fs: use dget_parent and file_dentry in f2fs_file_open
This patch synced with the below two ext4 crypto fixes together. In 4.6-rc1, f2fs newly introduced accessing f_path.dentry which crashes overlayfs. To fix, now we need to use file_dentry() to access that field. Fixes: c0a37d48 ("ext4: use file_dentry()") Fixes: 9dd78d8c ("ext4: use dget_parent() in ext4_file_open()") Cc: Miklos Szeredi <mszeredi@redhat.com> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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