[RFC PATCH 1/4] fs: Add FS_XFLAG_COMPRESSED & FS_XFLAG_ENCRYPTED for FS_IOC_FS[GS]ETXATTR API

[Pali Rohár <pali@xxxxxxxxxx>]

This allows to get or set FS_COMPR_FL and FS_ENCRYPT_FL bits via FS_IOC_FSGETXATTR/FS_IOC_FSSETXATTR API.

Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
---
 fs/ioctl.c               | 8 ++++++++
 include/linux/fileattr.h | 4 ++--
 include/uapi/linux/fs.h  | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 638a36be31c1..9f3609b50779 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -480,6 +480,10 @@ void fileattr_fill_xflags(struct fileattr *fa, u32 xflags)
 		fa->flags |= FS_DAX_FL;
 	if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 		fa->flags |= FS_PROJINHERIT_FL;
+	if (fa->fsx_xflags & FS_XFLAG_COMPRESSED)
+		fa->flags |= FS_COMPR_FL;
+	if (fa->fsx_xflags & FS_XFLAG_ENCRYPTED)
+		fa->flags |= FS_ENCRYPT_FL;
 }
 EXPORT_SYMBOL(fileattr_fill_xflags);
 
@@ -496,6 +500,8 @@ void fileattr_fill_flags(struct fileattr *fa, u32 flags)
 	memset(fa, 0, sizeof(*fa));
 	fa->flags_valid = true;
 	fa->flags = flags;
+	if (fa->flags & FS_COMPR_FL)
+		fa->fsx_xflags |= FS_XFLAG_COMPRESSED;
 	if (fa->flags & FS_SYNC_FL)
 		fa->fsx_xflags |= FS_XFLAG_SYNC;
 	if (fa->flags & FS_IMMUTABLE_FL)
@@ -506,6 +512,8 @@ void fileattr_fill_flags(struct fileattr *fa, u32 flags)
 		fa->fsx_xflags |= FS_XFLAG_NODUMP;
 	if (fa->flags & FS_NOATIME_FL)
 		fa->fsx_xflags |= FS_XFLAG_NOATIME;
+	if (fa->flags & FS_ENCRYPT_FL)
+		fa->fsx_xflags |= FS_XFLAG_ENCRYPTED;
 	if (fa->flags & FS_DAX_FL)
 		fa->fsx_xflags |= FS_XFLAG_DAX;
 	if (fa->flags & FS_PROJINHERIT_FL)
diff --git a/include/linux/fileattr.h b/include/linux/fileattr.h
index 47c05a9851d0..c297e6151703 100644
--- a/include/linux/fileattr.h
+++ b/include/linux/fileattr.h
@@ -7,12 +7,12 @@
 #define FS_COMMON_FL \
 	(FS_SYNC_FL | FS_IMMUTABLE_FL | FS_APPEND_FL | \
 	 FS_NODUMP_FL |	FS_NOATIME_FL | FS_DAX_FL | \
-	 FS_PROJINHERIT_FL)
+	 FS_PROJINHERIT_FL | FS_COMPR_FL | FS_ENCRYPT_FL)
 
 #define FS_XFLAG_COMMON \
 	(FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND | \
 	 FS_XFLAG_NODUMP | FS_XFLAG_NOATIME | FS_XFLAG_DAX | \
-	 FS_XFLAG_PROJINHERIT)
+	 FS_XFLAG_PROJINHERIT | FS_XFLAG_COMPRESSED | FS_XFLAG_ENCRYPTED)
 
 /*
  * Merged interface for miscellaneous file attributes.  'flags' originates from
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 2bbe00cf1248..367bc5289c47 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -167,6 +167,8 @@ struct fsxattr {
 #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
 #define FS_XFLAG_DAX		0x00008000	/* use DAX for IO */
 #define FS_XFLAG_COWEXTSIZE	0x00010000	/* CoW extent size allocator hint */
+#define FS_XFLAG_COMPRESSED	0x00020000	/* compressed file */
+#define FS_XFLAG_ENCRYPTED	0x00040000	/* encrypted file */
 #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
 
 /* the read-only stuff doesn't really belong here, but any other place is
-- 
2.20.1