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    ext4 crypto: use per-inode tfm structure · c936e1ec
    Theodore Ts'o 提交于
    As suggested by Herbert Xu, we shouldn't allocate a new tfm each time
    we read or write a page.  Instead we can use a single tfm hanging off
    the inode's crypt_info structure for all of our encryption needs for
    that inode, since the tfm can be used by multiple crypto requests in
    parallel.
    
    Also use cmpxchg() to avoid races that could result in crypt_info
    structure getting doubly allocated or doubly freed.
    Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
    c936e1ec
super.c 160.2 KB