Commit 3ad2522c authored Oct 29, 2019 by Eric Biggers

statx: define STATX_ATTR_VERITY



Add a statx attribute bit STATX_ATTR_VERITY which will be set if the
file has fs-verity enabled.  This is the statx() equivalent of
FS_VERITY_FL which is returned by FS_IOC_GETFLAGS.

This is useful because it allows applications to check whether a file is
a verity file without opening it.  Opening a verity file can be
expensive because the fsverity_info is set up on open, which involves
parsing metadata and optionally verifying a cryptographic signature.

This is analogous to how various other bits are exposed through both
FS_IOC_GETFLAGS and statx(), e.g. the encrypt bit.

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Acked-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>

parent c0d782a3

include/linux/stat.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -33,7 +33,8 @@ struct kstat {
		STATX_ATTR_IMMUTABLE \| \
		STATX_ATTR_APPEND \| \
		STATX_ATTR_NODUMP \| \
		STATX_ATTR_ENCRYPTED \
		STATX_ATTR_ENCRYPTED \| \
		STATX_ATTR_VERITY \
		)/* Attrs corresponding to FS__FL flags /
		u64 ino;
		dev_t dev;

include/uapi/linux/stat.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -167,8 +167,8 @@ struct statx {
		#define STATX_ATTR_APPEND 0x00000020 /* [I] File is append-only */
		#define STATX_ATTR_NODUMP 0x00000040 /* [I] File is not to be dumped */
		#define STATX_ATTR_ENCRYPTED 0x00000800 /* [I] File requires key to decrypt in fs */

		#define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */
		#define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */


		#endif /* _UAPI_LINUX_STAT_H */

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