ext4 crypto: use per-inode tfm structure
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: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b0bd1c1..56bfc2f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -959,7 +959,7 @@
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (EXT4_I(inode)->i_crypt_info)
- ext4_free_encryption_info(inode);
+ ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
#endif
}