diff options
Diffstat (limited to 'fs/overlayfs/overlayfs.h')
| -rw-r--r-- | fs/overlayfs/overlayfs.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 34cc72f8fb6a..2e659b355f61 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -7,6 +7,7 @@ #include <linux/kernel.h> #include <linux/uuid.h> #include <linux/fs.h> +#include <linux/fsverity.h> #include <linux/namei.h> #include <linux/posix_acl.h> #include <linux/posix_acl_xattr.h> @@ -132,6 +133,26 @@ struct ovl_fh { #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \ offsetof(struct ovl_fb, fid)) +/* On-disk format for "metacopy" xattr (if non-zero size) */ +struct ovl_metacopy { + u8 version; /* 0 */ + u8 len; /* size of this header + used digest bytes */ + u8 flags; + u8 digest_algo; /* FS_VERITY_HASH_ALG_* constant, 0 for no digest */ + u8 digest[FS_VERITY_MAX_DIGEST_SIZE]; /* Only the used part on disk */ +} __packed; + +#define OVL_METACOPY_MAX_SIZE (sizeof(struct ovl_metacopy)) +#define OVL_METACOPY_MIN_SIZE (OVL_METACOPY_MAX_SIZE - FS_VERITY_MAX_DIGEST_SIZE) +#define OVL_METACOPY_INIT { 0, OVL_METACOPY_MIN_SIZE } + +static inline int ovl_metadata_digest_size(const struct ovl_metacopy *metacopy) +{ + if (metacopy->len < OVL_METACOPY_MIN_SIZE) + return 0; + return (int)metacopy->len - OVL_METACOPY_MIN_SIZE; +} + extern const char *const ovl_xattr_table[][2]; static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox) { @@ -458,7 +479,8 @@ bool ovl_need_index(struct dentry *dentry); int ovl_nlink_start(struct dentry *dentry); void ovl_nlink_end(struct dentry *dentry); int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir); -int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path); +int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path, + struct ovl_metacopy *data); bool ovl_is_metacopy_dentry(struct dentry *dentry); char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding); int ovl_sync_status(struct ovl_fs *ofs); |