[PATCH 1/4] fs: introduce SB_INLINECRYPT

[Satya Tangirala <satyat@google.com>]

Introduce SB_INLINECRYPT, which is set by filesystems that wish to use
blk-crypto for file content en/decryption. This flag maps to the
'-o inlinecrypt' mount option which multiple filesystems will implement,
and code in fs/crypto/ needs to be able to check for this mount option
in a filesystem-independent way.

Signed-off-by: Satya Tangirala <satyat@google.com>
---
 fs/proc_namespace.c | 1 +
 include/linux/fs.h  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
index 3059a9394c2d..e0ff1f6ac8f1 100644
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -49,6 +49,7 @@ static int show_sb_opts(struct seq_file *m, struct super_block *sb)
 		{ SB_DIRSYNC, ",dirsync" },
 		{ SB_MANDLOCK, ",mand" },
 		{ SB_LAZYTIME, ",lazytime" },
+		{ SB_INLINECRYPT, ",inlinecrypt" },
 		{ 0, NULL }
 	};
 	const struct proc_fs_opts *fs_infop;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6c4ab4dc1cd7..abef6aa95524 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1380,6 +1380,7 @@ extern int send_sigurg(struct fown_struct *fown);
 #define SB_NODIRATIME	2048	/* Do not update directory access times */
 #define SB_SILENT	32768
 #define SB_POSIXACL	(1<<16)	/* VFS does not apply the umask */
+#define SB_INLINECRYPT	(1<<17)	/* Use blk-crypto for encrypted files */
 #define SB_KERNMOUNT	(1<<22) /* this is a kern_mount call */
 #define SB_I_VERSION	(1<<23) /* Update inode I_version field */
 #define SB_LAZYTIME	(1<<25) /* Update the on-disk [acm]times lazily */
-- 
2.27.0.290.gba653c62da-goog