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fsverity updates for 5.5

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Expose the fs-verity bit through statx().
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Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt

Pull fsverity updates from Eric Biggers:
 "Expose the fs-verity bit through statx()"

* tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt:
  docs: fs-verity: mention statx() support
  f2fs: support STATX_ATTR_VERITY
  ext4: support STATX_ATTR_VERITY
  statx: define STATX_ATTR_VERITY
  docs: fs-verity: document first supported kernel version
This commit is contained in:
Linus Torvalds 2019-11-25 12:21:23 -08:00
commit 1c1ff4836f
5 changed files with 21 additions and 6 deletions
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12
Documentation/filesystems/fsverity.rst
View File

@ -226,6 +226,14 @@ To do so, check for FS_VERITY_FL (0x00100000) in the returned flags.
The verity flag is not settable via FS_IOC_SETFLAGS. You must use
FS_IOC_ENABLE_VERITY instead, since parameters must be provided.
statx
-----
Since Linux v5.5, the statx() system call sets STATX_ATTR_VERITY if
the file has fs-verity enabled. This can perform better than
FS_IOC_GETFLAGS and FS_IOC_MEASURE_VERITY because it doesn't require
opening the file, and opening verity files can be expensive.
Accessing verity files
======================
@ -398,7 +406,7 @@ pages have been read into the pagecache. (See `Verifying data`_.)
ext4
----
ext4 supports fs-verity since Linux TODO and e2fsprogs v1.45.2.
ext4 supports fs-verity since Linux v5.4 and e2fsprogs v1.45.2.
To create verity files on an ext4 filesystem, the filesystem must have
been formatted with ``-O verity`` or had ``tune2fs -O verity`` run on
@ -434,7 +442,7 @@ also only supports extent-based files.
f2fs
----
f2fs supports fs-verity since Linux TODO and f2fs-tools v1.11.0.
f2fs supports fs-verity since Linux v5.4 and f2fs-tools v1.11.0.
To create verity files on an f2fs filesystem, the filesystem must have
been formatted with ``-O verity``.

5
fs/ext4/inode.c
View File

@ -5717,12 +5717,15 @@ int ext4_getattr(const struct path *path, struct kstat *stat,
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (flags & EXT4_NODUMP_FL)
stat->attributes |= STATX_ATTR_NODUMP;
if (flags & EXT4_VERITY_FL)
stat->attributes |= STATX_ATTR_VERITY;
stat->attributes_mask |= (STATX_ATTR_APPEND |
STATX_ATTR_COMPRESSED |
STATX_ATTR_ENCRYPTED |
STATX_ATTR_IMMUTABLE |
STATX_ATTR_NODUMP);
STATX_ATTR_NODUMP |
STATX_ATTR_VERITY);
generic_fillattr(inode, stat);
return 0;

5
fs/f2fs/file.c
View File

@ -726,11 +726,14 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (flags & F2FS_NODUMP_FL)
stat->attributes |= STATX_ATTR_NODUMP;
if (IS_VERITY(inode))
stat->attributes |= STATX_ATTR_VERITY;
stat->attributes_mask |= (STATX_ATTR_APPEND |
STATX_ATTR_ENCRYPTED |
STATX_ATTR_IMMUTABLE |
STATX_ATTR_NODUMP);
STATX_ATTR_NODUMP |
STATX_ATTR_VERITY);
generic_fillattr(inode, stat);

3
include/linux/stat.h
View File

@ -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 */