[PATCH v5 04/13] f2fs: move crypt info pointer to fs-specific part of inode

[Eric Biggers <ebiggers@kernel.org>]

Move the fscrypt_inode_info pointer into the filesystem-specific part of
the inode by adding the field f2fs_inode_info::i_crypt_info and
configuring fscrypt_operations::inode_info_offs accordingly.

This is a prerequisite for a later commit that removes
inode::i_crypt_info, saving memory and improving cache efficiency with
filesystems that don't support fscrypt.

Co-developed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
 fs/f2fs/f2fs.h  | 3 +++
 fs/f2fs/super.c | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 46be7560548ce..2f5c30c069c3c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -905,10 +905,13 @@ struct f2fs_inode_info {
 	unsigned char i_compress_flag;		/* compress flag */
 	unsigned int i_cluster_size;		/* cluster size */
 
 	unsigned int atomic_write_cnt;
 	loff_t original_i_size;		/* original i_size before atomic write */
+#ifdef CONFIG_FS_ENCRYPTION
+	struct fscrypt_inode_info *i_crypt_info; /* filesystem encryption info */
+#endif
 };
 
 static inline void get_read_extent_info(struct extent_info *ext,
 					struct f2fs_extent *i_ext)
 {
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index e16c4e2830c29..b42b55280d9e3 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -478,10 +478,13 @@ static inline void adjust_unusable_cap_perc(struct f2fs_sb_info *sbi)
 static void init_once(void *foo)
 {
 	struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 
 	inode_init_once(&fi->vfs_inode);
+#ifdef CONFIG_FS_ENCRYPTION
+	fi->i_crypt_info = NULL;
+#endif
 }
 
 #ifdef CONFIG_QUOTA
 static const char * const quotatypes[] = INITQFNAMES;
 #define QTYPE2NAME(t) (quotatypes[t])
@@ -3568,10 +3571,12 @@ static struct block_device **f2fs_get_devices(struct super_block *sb,
 	*num_devs = sbi->s_ndevs;
 	return devs;
 }
 
 static const struct fscrypt_operations f2fs_cryptops = {
+	.inode_info_offs	= (int)offsetof(struct f2fs_inode_info, i_crypt_info) -
+				  (int)offsetof(struct f2fs_inode_info, vfs_inode),
 	.needs_bounce_pages	= 1,
 	.has_32bit_inodes	= 1,
 	.supports_subblock_data_units = 1,
 	.legacy_key_prefix	= "f2fs:",
 	.get_context		= f2fs_get_context,
@@ -3579,11 +3584,11 @@ static const struct fscrypt_operations f2fs_cryptops = {
 	.get_dummy_policy	= f2fs_get_dummy_policy,
 	.empty_dir		= f2fs_empty_dir,
 	.has_stable_inodes	= f2fs_has_stable_inodes,
 	.get_devices		= f2fs_get_devices,
 };
-#endif
+#endif /* CONFIG_FS_ENCRYPTION */
 
 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 		u64 ino, u32 generation)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(sb);
-- 
2.50.1