Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "Lots of bug fixes and cleanups"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (40 commits)
  ext4: remove unused variable
  ext4: use journal inode to determine journal overhead
  ext4: create function to read journal inode
  ext4: unmap metadata when zeroing blocks
  ext4: remove plugging from ext4_file_write_iter()
  ext4: allow unlocked direct IO when pages are cached
  ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY
  fscrypto: use standard macros to compute length of fname ciphertext
  ext4: do not unnecessarily null-terminate encrypted symlink data
  ext4: release bh in make_indexed_dir
  ext4: Allow parallel DIO reads
  ext4: allow DAX writeback for hole punch
  jbd2: fix lockdep annotation in add_transaction_credits()
  blockgroup_lock.h: simplify definition of NR_BG_LOCKS
  blockgroup_lock.h: remove debris from bgl_lock_ptr() conversion
  fscrypto: make filename crypto functions return 0 on success
  fscrypto: rename completion callbacks to reflect usage
  fscrypto: remove unnecessary includes
  fscrypto: improved validation when loading inode encryption metadata
  ext4: fix memory leak when symlink decryption fails
  ...

2 files changed, 3 insertions, 49 deletions

diff --git a/include/linux/blockgroup_lock.h b/include/linux/blockgroup_lock.h
index e44b88ba552b..225bdb7daec7 100644
--- a/include/linux/blockgroup_lock.h
+++ b/include/linux/blockgroup_lock.h
@@ -10,28 +10,10 @@
 #include <linux/cache.h>
 
 #ifdef CONFIG_SMP
-
-/*
- * We want a power-of-two.  Is there a better way than this?
- */
-
-#if NR_CPUS >= 32
-#define NR_BG_LOCKS	128
-#elif NR_CPUS >= 16
-#define NR_BG_LOCKS	64
-#elif NR_CPUS >= 8
-#define NR_BG_LOCKS	32
-#elif NR_CPUS >= 4
-#define NR_BG_LOCKS	16
-#elif NR_CPUS >= 2
-#define NR_BG_LOCKS	8
+#define NR_BG_LOCKS	(4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32))
 #else
-#define NR_BG_LOCKS	4
-#endif
-
-#else	/* CONFIG_SMP */
 #define NR_BG_LOCKS	1
-#endif	/* CONFIG_SMP */
+#endif
 
 struct bgl_lock {
 	spinlock_t lock;
@@ -49,14 +31,10 @@ static inline void bgl_lock_init(struct blockgroup_lock *bgl)
 		spin_lock_init(&bgl->locks[i].lock);
 }
 
-/*
- * The accessor is a macro so we can embed a blockgroup_lock into different
- * superblock types
- */
 static inline spinlock_t *
 bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group)
 {
-	return &bgl->locks[(block_group) & (NR_BG_LOCKS-1)].lock;
+	return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock;
 }
 
 #endif
diff --git a/include/linux/fscrypto.h b/include/linux/fscrypto.h
index 76cff18bb032..ff8b11b26f31 100644
--- a/include/linux/fscrypto.h
+++ b/include/linux/fscrypto.h
@@ -111,23 +111,6 @@ struct fscrypt_completion_result {
 	struct fscrypt_completion_result ecr = { \
 		COMPLETION_INITIALIZER((ecr).completion), 0 }
 
-static inline int fscrypt_key_size(int mode)
-{
-	switch (mode) {
-	case FS_ENCRYPTION_MODE_AES_256_XTS:
-		return FS_AES_256_XTS_KEY_SIZE;
-	case FS_ENCRYPTION_MODE_AES_256_GCM:
-		return FS_AES_256_GCM_KEY_SIZE;
-	case FS_ENCRYPTION_MODE_AES_256_CBC:
-		return FS_AES_256_CBC_KEY_SIZE;
-	case FS_ENCRYPTION_MODE_AES_256_CTS:
-		return FS_AES_256_CTS_KEY_SIZE;
-	default:
-		BUG();
-	}
-	return 0;
-}
-
 #define FS_FNAME_NUM_SCATTER_ENTRIES	4
 #define FS_CRYPTO_BLOCK_SIZE		16
 #define FS_FNAME_CRYPTO_DIGEST_SIZE	32
@@ -202,13 +185,6 @@ static inline bool fscrypt_valid_filenames_enc_mode(u32 mode)
 	return (mode == FS_ENCRYPTION_MODE_AES_256_CTS);
 }
 
-static inline u32 fscrypt_validate_encryption_key_size(u32 mode, u32 size)
-{
-	if (size == fscrypt_key_size(mode))
-		return size;
-	return 0;
-}
-
 static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
 {
 	if (str->len == 1 && str->name[0] == '.')