SM0 She11

Full Path (server): /usr/include/linux

📄 a.out.h [E] [D]
📄 acct.h [E] [D]
📄 adb.h [E] [D]
📄 adfs_fs.h [E] [D]
📄 affs_hardblocks.h [E] [D]
📄 agpgart.h [E] [D]
📄 aio_abi.h [E] [D]
📄 apm_bios.h [E] [D]
📄 arcfb.h [E] [D]
📄 atalk.h [E] [D]
📄 atm.h [E] [D]
📄 atm_eni.h [E] [D]
📄 atm_he.h [E] [D]
📄 atm_idt77105.h [E] [D]
📄 atm_nicstar.h [E] [D]
📄 atm_tcp.h [E] [D]
📄 atm_zatm.h [E] [D]
📄 atmapi.h [E] [D]
📄 atmarp.h [E] [D]
📄 atmbr2684.h [E] [D]
📄 atmclip.h [E] [D]
📄 atmdev.h [E] [D]
📄 atmioc.h [E] [D]
📄 atmlec.h [E] [D]
📄 atmmpc.h [E] [D]
📄 atmppp.h [E] [D]
📄 atmsap.h [E] [D]
📄 atmsvc.h [E] [D]
📄 audit.h [E] [D]
📄 auto_fs.h [E] [D]
📄 auto_fs4.h [E] [D]
📄 auxvec.h [E] [D]
📄 ax25.h [E] [D]
📄 b1lli.h [E] [D]
📄 baycom.h [E] [D]
📄 bfs_fs.h [E] [D]
📄 binfmts.h [E] [D]
📄 blkpg.h [E] [D]
📄 blktrace_api.h [E] [D]
📄 bpf.h [E] [D]
📄 bpf_common.h [E] [D]
📄 bpf_perf_event.h [E] [D]
📄 bpqether.h [E] [D]
📄 bsg.h [E] [D]
📄 bt-bmc.h [E] [D]
📄 btrfs.h [E] [D]
📁 byteorder Open [D]
📁 caif Open [D]
📁 can Open [D]
📄 can.h [E] [D]
📄 capability.h [E] [D]
📄 capi.h [E] [D]
📄 cciss_defs.h [E] [D]
📄 cciss_ioctl.h [E] [D]
📄 cdrom.h [E] [D]
📄 cgroupstats.h [E] [D]
📄 chio.h [E] [D]
📄 cm4000_cs.h [E] [D]
📄 cn_proc.h [E] [D]
📄 coda.h [E] [D]
📄 coda_psdev.h [E] [D]
📄 coff.h [E] [D]
📄 connector.h [E] [D]
📄 const.h [E] [D]
📄 cramfs_fs.h [E] [D]
📄 cuda.h [E] [D]
📄 cyclades.h [E] [D]
📄 cycx_cfm.h [E] [D]
📄 dcbnl.h [E] [D]
📄 dccp.h [E] [D]
📄 devlink.h [E] [D]
📄 dlm.h [E] [D]
📄 dlm_device.h [E] [D]
📄 dlm_netlink.h [E] [D]
📄 dlm_plock.h [E] [D]
📄 dlmconstants.h [E] [D]
📄 dm-ioctl.h [E] [D]
📄 dm-log-userspace.h [E] [D]
📄 dn.h [E] [D]
📄 dqblk_xfs.h [E] [D]
📁 dvb Open [D]
📄 edd.h [E] [D]
📄 efs_fs_sb.h [E] [D]
📄 elf-em.h [E] [D]
📄 elf-fdpic.h [E] [D]
📄 elf.h [E] [D]
📄 elfcore.h [E] [D]
📄 errno.h [E] [D]
📄 errqueue.h [E] [D]
📄 ethtool.h [E] [D]
📄 eventpoll.h [E] [D]
📄 fadvise.h [E] [D]
📄 falloc.h [E] [D]
📄 fanotify.h [E] [D]
📄 fb.h [E] [D]
📄 fcntl.h [E] [D]
📄 fd.h [E] [D]
📄 fdreg.h [E] [D]
📄 fib_rules.h [E] [D]
📄 fiemap.h [E] [D]
📄 filter.h [E] [D]
📄 firewire-cdev.h [E] [D]
📄 firewire-constants.h [E] [D]
📄 flat.h [E] [D]
📄 fou.h [E] [D]
📄 fs.h [E] [D]
📄 fsl_hypervisor.h [E] [D]
📄 fuse.h [E] [D]
📄 futex.h [E] [D]
📄 gameport.h [E] [D]
📄 gen_stats.h [E] [D]
📄 genetlink.h [E] [D]
📄 gfs2_ondisk.h [E] [D]
📄 gigaset_dev.h [E] [D]
📁 hdlc Open [D]
📄 hdlc.h [E] [D]
📄 hdlcdrv.h [E] [D]
📄 hdreg.h [E] [D]
📄 hid.h [E] [D]
📄 hiddev.h [E] [D]
📄 hidraw.h [E] [D]
📄 hpet.h [E] [D]
📁 hsi Open [D]
📄 hw_breakpoint.h [E] [D]
📄 hyperv.h [E] [D]
📄 hysdn_if.h [E] [D]
📄 i2c-dev.h [E] [D]
📄 i2c.h [E] [D]
📄 i2o-dev.h [E] [D]
📄 i8k.h [E] [D]
📄 icmp.h [E] [D]
📄 icmpv6.h [E] [D]
📄 if.h [E] [D]
📄 if_addr.h [E] [D]
📄 if_addrlabel.h [E] [D]
📄 if_alg.h [E] [D]
📄 if_arcnet.h [E] [D]
📄 if_arp.h [E] [D]
📄 if_bonding.h [E] [D]
📄 if_bridge.h [E] [D]
📄 if_cablemodem.h [E] [D]
📄 if_eql.h [E] [D]
📄 if_ether.h [E] [D]
📄 if_fc.h [E] [D]
📄 if_fddi.h [E] [D]
📄 if_frad.h [E] [D]
📄 if_hippi.h [E] [D]
📄 if_infiniband.h [E] [D]
📄 if_link.h [E] [D]
📄 if_ltalk.h [E] [D]
📄 if_macsec.h [E] [D]
📄 if_packet.h [E] [D]
📄 if_phonet.h [E] [D]
📄 if_plip.h [E] [D]
📄 if_ppp.h [E] [D]
📄 if_pppol2tp.h [E] [D]
📄 if_pppox.h [E] [D]
📄 if_slip.h [E] [D]
📄 if_team.h [E] [D]
📄 if_tun.h [E] [D]
📄 if_tunnel.h [E] [D]
📄 if_vlan.h [E] [D]
📄 if_x25.h [E] [D]
📄 ife.h [E] [D]
📄 igmp.h [E] [D]
📁 iio Open [D]
📄 in.h [E] [D]
📄 in6.h [E] [D]
📄 in_route.h [E] [D]
📄 inet_diag.h [E] [D]
📄 inotify.h [E] [D]
📄 input.h [E] [D]
📄 ioctl.h [E] [D]
📄 ip.h [E] [D]
📄 ip6_tunnel.h [E] [D]
📄 ip_vs.h [E] [D]
📄 ipc.h [E] [D]
📄 ipmi.h [E] [D]
📄 ipmi_msgdefs.h [E] [D]
📄 ipsec.h [E] [D]
📄 ipv6.h [E] [D]
📄 ipv6_route.h [E] [D]
📄 ipx.h [E] [D]
📄 irda.h [E] [D]
📄 irqnr.h [E] [D]
📁 isdn Open [D]
📄 isdn.h [E] [D]
📄 isdn_divertif.h [E] [D]
📄 isdn_ppp.h [E] [D]
📄 isdnif.h [E] [D]
📄 iso_fs.h [E] [D]
📄 ivtv.h [E] [D]
📄 ivtvfb.h [E] [D]
📄 ixjuser.h [E] [D]
📄 jffs2.h [E] [D]
📄 joystick.h [E] [D]
📄 kd.h [E] [D]
📄 kdev_t.h [E] [D]
📄 kernel-page-flags.h [E] [D]
📄 kernel.h [E] [D]
📄 kernelcapi.h [E] [D]
📄 kexec.h [E] [D]
📄 keyboard.h [E] [D]
📄 keyctl.h [E] [D]
📄 kvm.h [E] [D]
📄 kvm_para.h [E] [D]
📄 l2tp.h [E] [D]
📄 libc-compat.h [E] [D]
📄 limits.h [E] [D]
📄 llc.h [E] [D]
📄 loop.h [E] [D]
📄 lp.h [E] [D]
📄 lwtunnel.h [E] [D]
📄 magic.h [E] [D]
📄 major.h [E] [D]
📄 map_to_7segment.h [E] [D]
📄 matroxfb.h [E] [D]
📄 mdio.h [E] [D]
📄 media.h [E] [D]
📄 mei.h [E] [D]
📄 membarrier.h [E] [D]
📄 memfd.h [E] [D]
📄 mempolicy.h [E] [D]
📄 meye.h [E] [D]
📄 mii.h [E] [D]
📄 minix_fs.h [E] [D]
📄 mman.h [E] [D]
📁 mmc Open [D]
📄 mmtimer.h [E] [D]
📄 mpls.h [E] [D]
📄 mqueue.h [E] [D]
📄 mroute.h [E] [D]
📄 mroute6.h [E] [D]
📄 msdos_fs.h [E] [D]
📄 msg.h [E] [D]
📄 mtio.h [E] [D]
📄 n_r3964.h [E] [D]
📄 nbd.h [E] [D]
📄 ncp.h [E] [D]
📄 ncp_fs.h [E] [D]
📄 ncp_mount.h [E] [D]
📄 ncp_no.h [E] [D]
📄 ndctl.h [E] [D]
📄 neighbour.h [E] [D]
📄 net.h [E] [D]
📄 net_dropmon.h [E] [D]
📄 net_namespace.h [E] [D]
📄 net_tstamp.h [E] [D]
📄 netconf.h [E] [D]
📄 netdevice.h [E] [D]
📁 netfilter Open [D]
📄 netfilter.h [E] [D]
📁 netfilter_arp Open [D]
📄 netfilter_arp.h [E] [D]
📁 netfilter_bridge Open [D]
📄 netfilter_bridge.h [E] [D]
📄 netfilter_decnet.h [E] [D]
📁 netfilter_ipv4 Open [D]
📄 netfilter_ipv4.h [E] [D]
📁 netfilter_ipv6 Open [D]
📄 netfilter_ipv6.h [E] [D]
📄 netlink.h [E] [D]
📄 netlink_diag.h [E] [D]
📄 netrom.h [E] [D]
📄 nfc.h [E] [D]
📄 nfs.h [E] [D]
📄 nfs2.h [E] [D]
📄 nfs3.h [E] [D]
📄 nfs4.h [E] [D]
📄 nfs4_mount.h [E] [D]
📄 nfs_fs.h [E] [D]
📄 nfs_idmap.h [E] [D]
📄 nfs_mount.h [E] [D]
📄 nfsacl.h [E] [D]
📁 nfsd Open [D]
📄 nl80211.h [E] [D]
📄 nubus.h [E] [D]
📄 nvme_ioctl.h [E] [D]
📄 nvram.h [E] [D]
📄 omap3isp.h [E] [D]
📄 omapfb.h [E] [D]
📄 oom.h [E] [D]
📄 openvswitch.h [E] [D]
📄 packet_diag.h [E] [D]
📄 param.h [E] [D]
📄 parport.h [E] [D]
📄 patchkey.h [E] [D]
📄 pci.h [E] [D]
📄 pci_regs.h [E] [D]
📄 perf_event.h [E] [D]
📄 personality.h [E] [D]
📄 pfkeyv2.h [E] [D]
📄 pg.h [E] [D]
📄 phantom.h [E] [D]
📄 phonet.h [E] [D]
📄 pkt_cls.h [E] [D]
📄 pkt_sched.h [E] [D]
📄 pktcdvd.h [E] [D]
📄 pmu.h [E] [D]
📄 poll.h [E] [D]
📄 posix_types.h [E] [D]
📄 ppdev.h [E] [D]
📄 ppp-comp.h [E] [D]
📄 ppp-ioctl.h [E] [D]
📄 ppp_defs.h [E] [D]
📄 pps.h [E] [D]
📄 prctl.h [E] [D]
📄 psample.h [E] [D]
📄 ptp_clock.h [E] [D]
📄 ptrace.h [E] [D]
📄 qnx4_fs.h [E] [D]
📄 qnxtypes.h [E] [D]
📄 quota.h [E] [D]
📄 radeonfb.h [E] [D]
📁 raid Open [D]
📄 random.h [E] [D]
📄 raw.h [E] [D]
📄 rds.h [E] [D]
📄 reboot.h [E] [D]
📄 reiserfs_fs.h [E] [D]
📄 reiserfs_xattr.h [E] [D]
📄 resource.h [E] [D]
📄 rfkill.h [E] [D]
📄 romfs_fs.h [E] [D]
📄 rose.h [E] [D]
📄 route.h [E] [D]
📄 rtc.h [E] [D]
📄 rtnetlink.h [E] [D]
📄 scc.h [E] [D]
📄 sched.h [E] [D]
📄 screen_info.h [E] [D]
📄 sctp.h [E] [D]
📄 sdla.h [E] [D]
📄 seccomp.h [E] [D]
📄 securebits.h [E] [D]
📄 selinux_netlink.h [E] [D]
📄 sem.h [E] [D]
📄 serial.h [E] [D]
📄 serial_core.h [E] [D]
📄 serial_reg.h [E] [D]
📄 serio.h [E] [D]
📄 shm.h [E] [D]
📄 signal.h [E] [D]
📄 signalfd.h [E] [D]
📄 snmp.h [E] [D]
📄 sock_diag.h [E] [D]
📄 socket.h [E] [D]
📄 sockios.h [E] [D]
📄 som.h [E] [D]
📄 sonet.h [E] [D]
📄 sonypi.h [E] [D]
📄 sound.h [E] [D]
📄 soundcard.h [E] [D]
📁 spi Open [D]
📄 stat.h [E] [D]
📄 stddef.h [E] [D]
📄 string.h [E] [D]
📁 sunrpc Open [D]
📄 suspend_ioctls.h [E] [D]
📄 swab.h [E] [D]
📄 synclink.h [E] [D]
📄 sysctl.h [E] [D]
📄 sysinfo.h [E] [D]
📄 target_core_user.h [E] [D]
📄 taskstats.h [E] [D]
📁 tc_act Open [D]
📁 tc_ematch Open [D]
📄 tcp.h [E] [D]
📄 tcp_metrics.h [E] [D]
📄 telephony.h [E] [D]
📄 termios.h [E] [D]
📄 time.h [E] [D]
📄 times.h [E] [D]
📄 timex.h [E] [D]
📄 tiocl.h [E] [D]
📄 tipc.h [E] [D]
📄 tipc_config.h [E] [D]
📄 toshiba.h [E] [D]
📄 tty.h [E] [D]
📄 tty_flags.h [E] [D]
📄 types.h [E] [D]
📄 udf_fs_i.h [E] [D]
📄 udp.h [E] [D]
📄 uhid.h [E] [D]
📄 uinput.h [E] [D]
📄 uio.h [E] [D]
📄 ultrasound.h [E] [D]
📄 un.h [E] [D]
📄 unistd.h [E] [D]
📄 unix_diag.h [E] [D]
📁 usb Open [D]
📄 usbdevice_fs.h [E] [D]
📄 userfaultfd.h [E] [D]
📄 utime.h [E] [D]
📄 utsname.h [E] [D]
📄 uuid.h [E] [D]
📄 uvcvideo.h [E] [D]
📄 v4l2-common.h [E] [D]
📄 v4l2-controls.h [E] [D]
📄 v4l2-dv-timings.h [E] [D]
📄 v4l2-mediabus.h [E] [D]
📄 v4l2-subdev.h [E] [D]
📄 version.h [E] [D]
📄 veth.h [E] [D]
📄 vfio.h [E] [D]
📄 vhost.h [E] [D]
📄 videodev2.h [E] [D]
📄 virtio_9p.h [E] [D]
📄 virtio_balloon.h [E] [D]
📄 virtio_blk.h [E] [D]
📄 virtio_config.h [E] [D]
📄 virtio_console.h [E] [D]
📄 virtio_gpu.h [E] [D]
📄 virtio_ids.h [E] [D]
📄 virtio_input.h [E] [D]
📄 virtio_net.h [E] [D]
📄 virtio_pci.h [E] [D]
📄 virtio_ring.h [E] [D]
📄 virtio_rng.h [E] [D]
📄 virtio_scsi.h [E] [D]
📄 virtio_types.h [E] [D]
📄 virtio_vsock.h [E] [D]
📄 vm_sockets.h [E] [D]
📄 vsockmon.h [E] [D]
📄 vt.h [E] [D]
📄 vtpm_proxy.h [E] [D]
📄 wait.h [E] [D]
📄 wanrouter.h [E] [D]
📄 watchdog.h [E] [D]
📁 wimax Open [D]
📄 wimax.h [E] [D]
📄 wireless.h [E] [D]
📄 wmi.h [E] [D]
📄 x25.h [E] [D]
📄 xattr.h [E] [D]
📄 xfrm.h [E] [D]

Editing: dm-log-userspace.h

/*
 * Copyright (C) 2006-2009 Red Hat, Inc.
 *
 * This file is released under the LGPL.
 */

#ifndef __DM_LOG_USERSPACE_H__
#define __DM_LOG_USERSPACE_H__

#include <linux/dm-ioctl.h> /* For DM_UUID_LEN */

/*
 * The device-mapper userspace log module consists of a kernel component and
 * a user-space component.  The kernel component implements the API defined
 * in dm-dirty-log.h.  Its purpose is simply to pass the parameters and
 * return values of those API functions between kernel and user-space.
 *
 * Below are defined the 'request_types' - DM_ULOG_CTR, DM_ULOG_DTR, etc.
 * These request types represent the different functions in the device-mapper
 * dirty log API.  Each of these is described in more detail below.
 *
 * The user-space program must listen for requests from the kernel (representing
 * the various API functions) and process them.
 *
 * User-space begins by setting up the communication link (error checking
 * removed for clarity):
 *	fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
 *	addr.nl_family = AF_NETLINK;
 *	addr.nl_groups = CN_IDX_DM;
 *	addr.nl_pid = 0;
 *	r = bind(fd, (struct sockaddr *) &addr, sizeof(addr));
 *	opt = addr.nl_groups;
 *	setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &opt, sizeof(opt));
 *
 * User-space will then wait to receive requests form the kernel, which it
 * will process as described below.  The requests are received in the form,
 * ((struct dm_ulog_request) + (additional data)).  Depending on the request
 * type, there may or may not be 'additional data'.  In the descriptions below,
 * you will see 'Payload-to-userspace' and 'Payload-to-kernel'.  The
 * 'Payload-to-userspace' is what the kernel sends in 'additional data' as
 * necessary parameters to complete the request.  The 'Payload-to-kernel' is
 * the 'additional data' returned to the kernel that contains the necessary
 * results of the request.  The 'data_size' field in the dm_ulog_request
 * structure denotes the availability and amount of payload data.
 */

/*
 * DM_ULOG_CTR corresponds to (found in dm-dirty-log.h):
 * int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
 *	      unsigned argc, char **argv);
 *
 * Payload-to-userspace:
 *	A single string containing all the argv arguments separated by ' 's
 * Payload-to-kernel:
 *	A NUL-terminated string that is the name of the device that is used
 *	as the backing store for the log data.  'dm_get_device' will be called
 *	on this device.  ('dm_put_device' will be called on this device
 *	automatically after calling DM_ULOG_DTR.)  If there is no device needed
 *	for log data, 'data_size' in the dm_ulog_request struct should be 0.
 *
 * The UUID contained in the dm_ulog_request structure is the reference that
 * will be used by all request types to a specific log.  The constructor must
 * record this association with the instance created.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field, filling the
 * data field with the log device if necessary, and setting 'data_size'
 * appropriately.
 */
#define DM_ULOG_CTR                    1

/*
 * DM_ULOG_DTR corresponds to (found in dm-dirty-log.h):
 * void (*dtr)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	A single string containing all the argv arguments separated by ' 's
 * Payload-to-kernel:
 *	None.  ('data_size' in the dm_ulog_request struct should be 0.)
 *
 * The UUID contained in the dm_ulog_request structure is all that is
 * necessary to identify the log instance being destroyed.  There is no
 * payload data.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and clearing
 * 'data_size' appropriately.
 */
#define DM_ULOG_DTR                    2

/*
 * DM_ULOG_PRESUSPEND corresponds to (found in dm-dirty-log.h):
 * int (*presuspend)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	None.
 *
 * The UUID contained in the dm_ulog_request structure is all that is
 * necessary to identify the log instance being presuspended.  There is no
 * payload data.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_PRESUSPEND             3

/*
 * DM_ULOG_POSTSUSPEND corresponds to (found in dm-dirty-log.h):
 * int (*postsuspend)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	None.
 *
 * The UUID contained in the dm_ulog_request structure is all that is
 * necessary to identify the log instance being postsuspended.  There is no
 * payload data.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_POSTSUSPEND            4

/*
 * DM_ULOG_RESUME corresponds to (found in dm-dirty-log.h):
 * int (*resume)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	None.
 *
 * The UUID contained in the dm_ulog_request structure is all that is
 * necessary to identify the log instance being resumed.  There is no
 * payload data.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_RESUME                 5

/*
 * DM_ULOG_GET_REGION_SIZE corresponds to (found in dm-dirty-log.h):
 * uint32_t (*get_region_size)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	uint64_t - contains the region size
 *
 * The region size is something that was determined at constructor time.
 * It is returned in the payload area and 'data_size' is set to
 * reflect this.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field appropriately.
 */
#define DM_ULOG_GET_REGION_SIZE        6

/*
 * DM_ULOG_IS_CLEAN corresponds to (found in dm-dirty-log.h):
 * int (*is_clean)(struct dm_dirty_log *log, region_t region);
 *
 * Payload-to-userspace:
 *	uint64_t - the region to get clean status on
 * Payload-to-kernel:
 *	int64_t  - 1 if clean, 0 otherwise
 *
 * Payload is sizeof(uint64_t) and contains the region for which the clean
 * status is being made.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - filling the payload with 0 (not clean) or
 * 1 (clean), setting 'data_size' and 'error' appropriately.
 */
#define DM_ULOG_IS_CLEAN               7

/*
 * DM_ULOG_IN_SYNC corresponds to (found in dm-dirty-log.h):
 * int (*in_sync)(struct dm_dirty_log *log, region_t region,
 *		  int can_block);
 *
 * Payload-to-userspace:
 *	uint64_t - the region to get sync status on
 * Payload-to-kernel:
 *	int64_t - 1 if in-sync, 0 otherwise
 *
 * Exactly the same as 'is_clean' above, except this time asking "has the
 * region been recovered?" vs. "is the region not being modified?"
 */
#define DM_ULOG_IN_SYNC                8

/*
 * DM_ULOG_FLUSH corresponds to (found in dm-dirty-log.h):
 * int (*flush)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	If the 'integrated_flush' directive is present in the constructor
 *	table, the payload is as same as DM_ULOG_MARK_REGION:
 *		uint64_t [] - region(s) to mark
 *	else
 *		None
 * Payload-to-kernel:
 *	None.
 *
 * If the 'integrated_flush' option was used during the creation of the
 * log, mark region requests are carried as payload in the flush request.
 * Piggybacking the mark requests in this way allows for fewer communications
 * between kernel and userspace.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and clearing
 * 'data_size' appropriately.
 */
#define DM_ULOG_FLUSH                  9

/*
 * DM_ULOG_MARK_REGION corresponds to (found in dm-dirty-log.h):
 * void (*mark_region)(struct dm_dirty_log *log, region_t region);
 *
 * Payload-to-userspace:
 *	uint64_t [] - region(s) to mark
 * Payload-to-kernel:
 *	None.
 *
 * Incoming payload contains the one or more regions to mark dirty.
 * The number of regions contained in the payload can be determined from
 * 'data_size/sizeof(uint64_t)'.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and clearing
 * 'data_size' appropriately.
 */
#define DM_ULOG_MARK_REGION           10

/*
 * DM_ULOG_CLEAR_REGION corresponds to (found in dm-dirty-log.h):
 * void (*clear_region)(struct dm_dirty_log *log, region_t region);
 *
 * Payload-to-userspace:
 *	uint64_t [] - region(s) to clear
 * Payload-to-kernel:
 *	None.
 *
 * Incoming payload contains the one or more regions to mark clean.
 * The number of regions contained in the payload can be determined from
 * 'data_size/sizeof(uint64_t)'.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and clearing
 * 'data_size' appropriately.
 */
#define DM_ULOG_CLEAR_REGION          11

/*
 * DM_ULOG_GET_RESYNC_WORK corresponds to (found in dm-dirty-log.h):
 * int (*get_resync_work)(struct dm_dirty_log *log, region_t *region);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	{
 *		int64_t i; -- 1 if recovery necessary, 0 otherwise
 *		uint64_t r; -- The region to recover if i=1
 *	}
 * 'data_size' should be set appropriately.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field appropriately.
 */
#define DM_ULOG_GET_RESYNC_WORK       12

/*
 * DM_ULOG_SET_REGION_SYNC corresponds to (found in dm-dirty-log.h):
 * void (*set_region_sync)(struct dm_dirty_log *log,
 *			   region_t region, int in_sync);
 *
 * Payload-to-userspace:
 *	{
 *		uint64_t - region to set sync state on
 *		int64_t  - 0 if not-in-sync, 1 if in-sync
 *	}
 * Payload-to-kernel:
 *	None.
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and clearing
 * 'data_size' appropriately.
 */
#define DM_ULOG_SET_REGION_SYNC       13

/*
 * DM_ULOG_GET_SYNC_COUNT corresponds to (found in dm-dirty-log.h):
 * region_t (*get_sync_count)(struct dm_dirty_log *log);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	uint64_t - the number of in-sync regions
 *
 * No incoming payload.  Kernel-bound payload contains the number of
 * regions that are in-sync (in a size_t).
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_GET_SYNC_COUNT        14

/*
 * DM_ULOG_STATUS_INFO corresponds to (found in dm-dirty-log.h):
 * int (*status)(struct dm_dirty_log *log, STATUSTYPE_INFO,
 *		 char *result, unsigned maxlen);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	Character string containing STATUSTYPE_INFO
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_STATUS_INFO           15

/*
 * DM_ULOG_STATUS_TABLE corresponds to (found in dm-dirty-log.h):
 * int (*status)(struct dm_dirty_log *log, STATUSTYPE_TABLE,
 *		 char *result, unsigned maxlen);
 *
 * Payload-to-userspace:
 *	None.
 * Payload-to-kernel:
 *	Character string containing STATUSTYPE_TABLE
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_STATUS_TABLE          16

/*
 * DM_ULOG_IS_REMOTE_RECOVERING corresponds to (found in dm-dirty-log.h):
 * int (*is_remote_recovering)(struct dm_dirty_log *log, region_t region);
 *
 * Payload-to-userspace:
 *	uint64_t - region to determine recovery status on
 * Payload-to-kernel:
 *	{
 *		int64_t is_recovering;  -- 0 if no, 1 if yes
 *		uint64_t in_sync_hint;  -- lowest region still needing resync
 *	}
 *
 * When the request has been processed, user-space must return the
 * dm_ulog_request to the kernel - setting the 'error' field and
 * 'data_size' appropriately.
 */
#define DM_ULOG_IS_REMOTE_RECOVERING  17

/*
 * (DM_ULOG_REQUEST_MASK & request_type) to get the request type
 *
 * Payload-to-userspace:
 *	A single string containing all the argv arguments separated by ' 's
 * Payload-to-kernel:
 *	None.  ('data_size' in the dm_ulog_request struct should be 0.)
 *
 * We are reserving 8 bits of the 32-bit 'request_type' field for the
 * various request types above.  The remaining 24-bits are currently
 * set to zero and are reserved for future use and compatibility concerns.
 *
 * User-space should always use DM_ULOG_REQUEST_TYPE to acquire the
 * request type from the 'request_type' field to maintain forward compatibility.
 */
#define DM_ULOG_REQUEST_MASK 0xFF
#define DM_ULOG_REQUEST_TYPE(request_type) \
	(DM_ULOG_REQUEST_MASK & (request_type))

/*
 * DM_ULOG_REQUEST_VERSION is incremented when there is a
 * change to the way information is passed between kernel
 * and userspace.  This could be a structure change of
 * dm_ulog_request or a change in the way requests are
 * issued/handled.  Changes are outlined here:
 *	version 1:  Initial implementation
 *	version 2:  DM_ULOG_CTR allowed to return a string containing a
 *	            device name that is to be registered with DM via
 *	            'dm_get_device'.
 *	version 3:  DM_ULOG_FLUSH is capable of carrying payload for marking
 *		    regions.  This "integrated flush" reduces the number of
 *		    requests between the kernel and userspace by effectively
 *		    merging 'mark' and 'flush' requests.  A constructor table
 *		    argument ('integrated_flush') is required to turn this
 *		    feature on, so it is backwards compatible with older
 *		    userspace versions.
 */
#define DM_ULOG_REQUEST_VERSION 3

struct dm_ulog_request {
	/*
	 * The local unique identifier (luid) and the universally unique
	 * identifier (uuid) are used to tie a request to a specific
	 * mirror log.  A single machine log could probably make due with
	 * just the 'luid', but a cluster-aware log must use the 'uuid' and
	 * the 'luid'.  The uuid is what is required for node to node
	 * communication concerning a particular log, but the 'luid' helps
	 * differentiate between logs that are being swapped and have the
	 * same 'uuid'.  (Think "live" and "inactive" device-mapper tables.)
	 */
	uint64_t luid;
	char uuid[DM_UUID_LEN];
	char padding[3];        /* Padding because DM_UUID_LEN = 129 */

uint32_t version;       /* See DM_ULOG_REQUEST_VERSION */
	int32_t error;          /* Used to report back processing errors */

uint32_t seq;           /* Sequence number for request */
	uint32_t request_type;  /* DM_ULOG_* defined above */
	uint32_t data_size;     /* How much data (not including this struct) */

char data[0];
};

#endif /* __DM_LOG_USERSPACE_H__ */