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statx: define STATX_ATTR_VERITY

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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>
This commit is contained in:
Eric Biggers 2019-10-29 13:41:38 -07:00 committed by Jaegeuk Kim
parent eb08e6251d
commit 1017779f1e
2 changed files with 3 additions and 2 deletions
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3
include/linux/stat.h
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@ -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;

2
include/uapi/linux/stat.h
View file

@ -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 */