f2fs: reserve bits for fs-verity

Reserve an F2FS feature flag and inode flag for fs-verity.  This is an
in-development feature that is planned be discussed at LSF/MM 2018 [1].
It will provide file-based integrity and authenticity for read-only
files.  Most code will be in a filesystem-independent module, with
smaller changes needed to individual filesystems that opt-in to
supporting the feature.  An early prototype supporting F2FS is available
[2].  Reserving the F2FS on-disk bits for fs-verity will prevent users
of the prototype from conflicting with other new F2FS features.

Note that we're reserving the inode flag in f2fs_inode.i_advise, which
isn't really appropriate since it's not a hint or advice.  But
->i_advise is already being used to hold the 'encrypt' flag; and F2FS's
->i_flags uses the generic FS_* values, so it seems ->i_flags can't be
used for an F2FS-specific flag without additional work to remove the
assumption that ->i_flags uses the generic flags namespace.

[1] https://marc.info/?l=linux-fsdevel&m=151690752225644
[2] https://git.kernel.org/pub/scm/linux/kernel/git/mhalcrow/linux.git/log/?h=fs-verity-dev

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ae69dc3..96d7809 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -146,6 +146,7 @@ struct f2fs_mount_info {
 #define F2FS_FEATURE_QUOTA_INO         0x0080
 #define F2FS_FEATURE_INODE_CRTIME      0x0100
 #define F2FS_FEATURE_LOST_FOUND                0x0200
+#define F2FS_FEATURE_VERITY            0x0400  /* reserved */
 
 #define F2FS_HAS_FEATURE(sb, mask)                                     \
        ((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -598,6 +599,7 @@ enum {
 #define FADVISE_ENC_NAME_BIT   0x08
 #define FADVISE_KEEP_SIZE_BIT  0x10
 #define FADVISE_HOT_BIT                0x20
+#define FADVISE_VERITY_BIT     0x40    /* reserved */
 
 #define file_is_cold(inode)    is_file(inode, FADVISE_COLD_BIT)
 #define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT)