1 /* SPDX-License-Identifier: GPL-2.0-only */
31 #define OVL_XATTR_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_TRUSTED_PREFIX) - 1)
33 #define OVL_XATTR_USER_PREFIX_LEN (sizeof(OVL_XATTR_USER_PREFIX) - 1)
36 #define OVL_XATTR_ESCAPE_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_PREFIX) - 1)
38 #define OVL_XATTR_ESCAPE_TRUSTED_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_TRUSTED_PREFIX) - 1)
40 #define OVL_XATTR_ESCAPE_USER_PREFIX_LEN (sizeof(OVL_XATTR_ESCAPE_USER_PREFIX) - 1)
58 	/* Non-merge dir that may contain whiteout entries */
103  * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
105  * origin.fh	- exported file handle of the lower file
106  * origin.uuid	- uuid of the lower filesystem
133 /* On-disk format for "origin" file handle */
141 	u32 fid[];	/* file identifier should be 32bit aligned in-memory */
144 /* In-memory and on-wire format for overlay file handle */
154 #define OVL_FH_LEN(fh)		(OVL_FH_WIRE_OFFSET + (fh)->fb.len)
158 /* On-disk format for "metacopy" xattr (if non-zero size) */
168 #define OVL_METACOPY_MIN_SIZE (OVL_METACOPY_MAX_SIZE - FS_VERITY_MAX_DIGEST_SIZE)
173 	if (metacopy->len < OVL_METACOPY_MIN_SIZE)  in ovl_metadata_digest_size()
175 	return (int)metacopy->len - OVL_METACOPY_MIN_SIZE;  in ovl_metadata_digest_size()
184 	return ovl_xattr_table[ox][ofs->config.userxattr];  in ovl_xattr()
190  * that are stored on-disk as owned by id 1001 to id 1000 this means stat on
194  * called on an idmapped upper mount the value written to disk - i.e., the
195  * value stored in ia_*id - must 1001. The mount mapping helper will thus take
281 	WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb);  in ovl_do_getxattr()
283 	err = vfs_getxattr(mnt_idmap(path->mnt), path->dentry,  in ovl_do_getxattr()
288 		 path->dentry, name, min(len, 48), value, size, err);  in ovl_do_getxattr()
430 	inode_unlock(parent->d_inode);  in ovl_parent_unlock()
444 	return OVL_FS(sb)->creator_cred;  in ovl_creds()
467 	return sb_has_encoding(dentry->d_sb) && IS_CASEFOLDED(d_inode(dentry));  in ovl_dentry_casefolded()
575 	set_bit(flag, &OVL_I(inode)->flags);  in ovl_set_flag()
580 	clear_bit(flag, &OVL_I(inode)->flags);  in ovl_clear_flag()
585 	return test_bit(flag, &OVL_I(inode)->flags);  in ovl_test_flag()
597 	return ovl_get_dir_xattr_val(ofs, &upperpath, OVL_XATTR_IMPURE) == 'y';  in ovl_is_impuredir()
608 	return ofs->config.redirect_mode != OVL_REDIRECT_NOFOLLOW;  in ovl_redirect_follow()
613 	return ofs->config.redirect_mode == OVL_REDIRECT_ON;  in ovl_redirect_dir()
618 	return ofs->config.uuid != OVL_UUID_OFF;  in ovl_origin_uuid()
623 	return ofs->config.uuid == OVL_UUID_ON ||  in ovl_has_fsid()
624 	       ofs->config.uuid == OVL_UUID_AUTO;  in ovl_has_fsid()
634 	return ofs->config.xino == OVL_XINO_ON;  in ovl_xino_warn()
643 	return (!ofs->config.index && !ofs->config.metacopy &&  in ovl_allow_offline_changes()
650 	return ofs->xino_mode == 0;  in ovl_same_fs()
656 	return ofs->xino_mode >= 0;  in ovl_same_dev()
661 	return ovl_same_dev(ofs) ? ofs->xino_mode : 0;  in ovl_xino_bits()
666 	mutex_lock(&OVL_I(inode)->lock);  in ovl_inode_lock()
671 	return mutex_lock_interruptible(&OVL_I(inode)->lock);  in ovl_inode_lock_interruptible()
676 	mutex_unlock(&OVL_I(inode)->lock);  in ovl_inode_unlock()
686 		return -EINVAL;  in ovl_check_fh_len()
688 	return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);  in ovl_check_fh_len()
705 int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
709 				struct dentry *origin, bool verify);
724 				    struct dentry *origin, bool set)  in ovl_verify_origin()  argument
726 	return ovl_verify_origin_xattr(ofs, upper, OVL_XATTR_ORIGIN, origin,  in ovl_verify_origin()
753  * Non-merge dir may contain whiteouts from a time it was a merge upper, before
832  * We cannot copy up immutable/append-only flags, because that would prevent
848 	inode_set_flags(to, from->i_flags & mask, mask);  in ovl_copyflags()
891 struct ovl_fh *ovl_get_origin_fh(struct ovl_fs *ofs, struct dentry *origin);
905 	return (!ovl_upper_mnt(ofs) || !ofs->workdir);  in ovl_force_readonly()