golden hour

/usr/include/linux

File/Folder	Size	Actions
a.out.h	7.15 KB
acct.h	3.58 KB
adb.h	1.05 KB
adfs_fs.h	873 B
affs_hardblocks.h	1.45 KB
agpgart.h	3.83 KB
aio_abi.h	3.18 KB
apm_bios.h	3.46 KB
arcfb.h	150 B
atalk.h	960 B
atm.h	7.64 KB
atm_eni.h	585 B
atm_he.h	343 B
atm_idt77105.h	892 B
atm_nicstar.h	1.19 KB
atm_tcp.h	1.52 KB
atm_zatm.h	1.57 KB
atmapi.h	889 B
atmarp.h	1.2 KB
atmbr2684.h	3.13 KB
atmclip.h	513 B
atmdev.h	7.44 KB
atmioc.h	1.55 KB
atmlec.h	2.26 KB
atmmpc.h	4.07 KB
atmppp.h	576 B
atmsap.h	4.79 KB
atmsvc.h	1.75 KB
audit.h	17.83 KB
auto_fs.h	2.53 KB
auto_fs4.h	4.23 KB
auxvec.h	1.4 KB
ax25.h	2.7 KB
b1lli.h	1.62 KB
baycom.h	820 B
beancounter.h	2.38 KB
bfs_fs.h	1.79 KB
binfmts.h	565 B
blkpg.h	1.56 KB
blktrace_api.h	4.38 KB
bpqether.h	952 B
bsg.h	2.37 KB
bt-bmc.h	508 B
btrfs.h	25.07 KB
byteorder	-
caif	-
can	-
can.h	5.46 KB
capability.h	10.92 KB
capi.h	2.99 KB
cciss_defs.h	3.14 KB
cciss_ioctl.h	2.63 KB
cdrom.h	28.12 KB
cgroupstats.h	2.1 KB
chio.h	5.16 KB
cm4000_cs.h	1.68 KB
cn_proc.h	3.19 KB
coda.h	17.09 KB
coda_psdev.h	720 B
coff.h	12.12 KB
compat.h	9.63 KB
connector.h	2.14 KB
const.h	673 B
cramfs_fs.h	2.68 KB
cuda.h	842 B
cyclades.h	16.65 KB
cycx_cfm.h	2.86 KB
dcbnl.h	24.19 KB
dccp.h	6.22 KB
devlink.h	7.09 KB
dlm.h	2.43 KB
dlm_device.h	2.42 KB
dlm_netlink.h	1.04 KB
dlm_plock.h	831 B
dlmconstants.h	4.9 KB
dm-ioctl.h	10.55 KB
dm-log-userspace.h	14.82 KB
dn.h	4.42 KB
dqblk_xfs.h	8.72 KB
dvb	-
edd.h	5.41 KB
efs_fs_sb.h	2.11 KB
elf-em.h	1.83 KB
elf-fdpic.h	1.04 KB
elf.h	12.63 KB
elfcore.h	2.86 KB
errno.h	23 B
errqueue.h	1.1 KB
ethtool.h	68.76 KB
eventpoll.h	1.76 KB
fadvise.h	855 B
falloc.h	1.98 KB
fanotify.h	3.52 KB
fb.h	16 KB
fcntl.h	2.16 KB
fd.h	11.31 KB
fdreg.h	5.23 KB
fib_rules.h	1.57 KB
fiemap.h	2.65 KB
filter.h	3.53 KB
firewire-cdev.h	42.86 KB
firewire-constants.h	3.16 KB
flat.h	2.04 KB
fou.h	617 B
fs.h	9.84 KB
fsl_hypervisor.h	7.05 KB
fuse.h	16.22 KB
futex.h	4.81 KB
gameport.h	834 B
gen_stats.h	1.48 KB
genetlink.h	1.85 KB
gfs2_ondisk.h	12 KB
gigaset_dev.h	1.35 KB
hdlc	-
hdlc.h	574 B
hdlcdrv.h	2.78 KB
hdreg.h	22.11 KB
hid.h	1.79 KB
hiddev.h	6.13 KB
hidraw.h	1.41 KB
hpet.h	680 B
hsi	-
hw_breakpoint.h	679 B
hyperv.h	10.22 KB
hysdn_if.h	1.29 KB
i2c-dev.h	2.37 KB
i2c.h	6.61 KB
i2o-dev.h	11.22 KB
i8k.h	1.4 KB
icmp.h	2.82 KB
icmpv6.h	3.82 KB
if.h	9.36 KB
if_addr.h	1.7 KB
if_addrlabel.h	658 B
if_alg.h	816 B
if_arcnet.h	3.63 KB
if_arp.h	6.3 KB
if_bonding.h	4.11 KB
if_bridge.h	6.46 KB
if_cablemodem.h	922 B
if_eql.h	1.26 KB
if_ether.h	7.13 KB
if_fc.h	1.63 KB
if_fddi.h	3.6 KB
if_frad.h	2.89 KB
if_hippi.h	4.07 KB
if_infiniband.h	1.13 KB
if_link.h	19.1 KB
if_ltalk.h	147 B
if_macsec.h	5.42 KB
if_packet.h	7.15 KB
if_phonet.h	361 B
if_plip.h	596 B
if_ppp.h	29 B
if_pppol2tp.h	3.18 KB
if_pppox.h	4.64 KB
if_slip.h	809 B
if_team.h	2.48 KB
if_tun.h	3.77 KB
if_tunnel.h	3 KB
if_vlan.h	1.69 KB
if_x25.h	817 B
ife.h	288 B
igmp.h	2.88 KB
in.h	9.15 KB
in6.h	6.99 KB
in_route.h	873 B
inet_diag.h	3.23 KB
inotify.h	3.09 KB
input.h	32.47 KB
ioctl.h	100 B
ip.h	3.47 KB
ip6_tunnel.h	1.67 KB
ip_vs.h	12.71 KB
ipc.h	1.99 KB
ipmi.h	15.8 KB
ipmi_msgdefs.h	4.37 KB
ipsec.h	884 B
ipv6.h	3.25 KB
ipv6_route.h	1.69 KB
ipx.h	1.79 KB
irda.h	7.31 KB
irqnr.h	104 B
isdn	-
isdn.h	5.58 KB
isdn_divertif.h	1.11 KB
isdn_ppp.h	1.82 KB
isdnif.h	2.25 KB
iso_fs.h	6.29 KB
ivtv.h	2.89 KB
ivtvfb.h	1.12 KB
ixjuser.h	24.53 KB
jffs2.h	6.85 KB
joystick.h	3.5 KB
kd.h	6.04 KB
kdev_t.h	320 B
kernel-page-flags.h	767 B
kernel.h	375 B
kernelcapi.h	956 B
kexec.h	1.92 KB
keyboard.h	12.42 KB
keyctl.h	2.98 KB
kvm.h	33.97 KB
kvm_para.h	819 B
l2tp.h	4.98 KB
libc-compat.h	3.44 KB
limits.h	874 B
llc.h	2.98 KB
loop.h	2.31 KB
lp.h	3.72 KB
lwtunnel.h	839 B
magic.h	2.91 KB
major.h	4.48 KB
map_to_7segment.h	7.02 KB
matroxfb.h	1.37 KB
mdio.h	13.74 KB
media.h	3.5 KB
mei.h	4.62 KB
memfd.h	186 B
mempolicy.h	2.35 KB
meye.h	2.41 KB
mii.h	7.76 KB
minix_fs.h	2.01 KB
mman.h	230 B
mmc	-
mmtimer.h	2.01 KB
mpls.h	1.33 KB
mqueue.h	2.01 KB
mroute.h	4.12 KB
mroute6.h	4.08 KB
msdos_fs.h	6.28 KB
msg.h	2.55 KB
mtio.h	7.92 KB
n_r3964.h	2.29 KB
nbd.h	2.34 KB
ncp.h	4.94 KB
ncp_fs.h	3.27 KB
ncp_mount.h	2.06 KB
ncp_no.h	651 B
ndctl.h	8.79 KB
neighbour.h	4.17 KB
net.h	1.97 KB
net_dropmon.h	1.07 KB
net_namespace.h	609 B
net_tstamp.h	4.06 KB
netconf.h	423 B
netdevice.h	1.46 KB
netfilter	-
netfilter.h	1.56 KB
netfilter_arp	-
netfilter_arp.h	380 B
netfilter_bridge	-
netfilter_bridge.h	768 B
netfilter_decnet.h	1.83 KB
netfilter_ipv4	-
netfilter_ipv4.h	2.02 KB
netfilter_ipv6	-
netfilter_ipv6.h	2.04 KB
netlink.h	6.22 KB
netlink_diag.h	1.33 KB
netrom.h	744 B
nfc.h	7.72 KB
nfs.h	4.31 KB
nfs2.h	1.37 KB
nfs3.h	2.24 KB
nfs4.h	5.95 KB
nfs4_mount.h	1.83 KB
nfs_fs.h	1.51 KB
nfs_idmap.h	2.19 KB
nfs_mount.h	2.32 KB
nfsacl.h	605 B
nfsd	-
nl80211.h	226.29 KB
nubus.h	8.17 KB
nvme_ioctl.h	1.55 KB
nvram.h	469 B
omap3isp.h	20.19 KB
omapfb.h	5.72 KB
oom.h	448 B
openvswitch.h	31.79 KB
packet_diag.h	1.5 KB
param.h	78 B
parport.h	3.56 KB
patchkey.h	829 B
pci.h	1.29 KB
pci_regs.h	49.96 KB
perf_event.h	29.53 KB
personality.h	1.99 KB
pfkeyv2.h	9.91 KB
pg.h	2.23 KB
phantom.h	1.55 KB
phonet.h	4.51 KB
pkt_cls.h	11.51 KB
pkt_sched.h	19.75 KB
pktcdvd.h	2.56 KB
pmu.h	5.13 KB
poll.h	22 B
posix_types.h	1.01 KB
ppdev.h	3.07 KB
ppp-comp.h	2.41 KB
ppp-ioctl.h	5.29 KB
ppp_defs.h	4.93 KB
pps.h	4.06 KB
prctl.h	6.71 KB
psample.h	735 B
ptp_clock.h	4.69 KB
ptrace.h	3.2 KB
qnx4_fs.h	2.21 KB
qnxtypes.h	561 B
quota.h	5.78 KB
radeonfb.h	297 B
raid	-
random.h	1.2 KB
raw.h	302 B
rds.h	7.9 KB
reboot.h	1.25 KB
reiserfs_fs.h	712 B
reiserfs_xattr.h	464 B
resource.h	2.09 KB
rfkill.h	3.5 KB
romfs_fs.h	1.15 KB
rose.h	2.12 KB
route.h	2.21 KB
rtc.h	3.85 KB
rtnetlink.h	16.63 KB
scc.h	4.43 KB
sched.h	2.23 KB
screen_info.h	2.36 KB
sctp.h	29.29 KB
sdla.h	2.71 KB
seccomp.h	1.79 KB
securebits.h	2.58 KB
selinux_netlink.h	1.11 KB
sem.h	2.52 KB
serial.h	3.04 KB
serial_core.h	5.11 KB
serial_reg.h	15.66 KB
serio.h	1.77 KB
shm.h	2.17 KB
signal.h	171 B
signalfd.h	1.07 KB
snmp.h	12.38 KB
sock_diag.h	431 B
socket.h	738 B
sockios.h	5.89 KB
som.h	5.35 KB
sonet.h	2.17 KB
sonypi.h	5.12 KB
sound.h	1.15 KB
soundcard.h	44.96 KB
spi	-
stat.h	1 KB
stddef.h	1 B
string.h	175 B
sunrpc	-
suspend_ioctls.h	1.34 KB
swab.h	6.36 KB
synclink.h	8.71 KB
sysctl.h	25.46 KB
sysinfo.h	986 B
target_core_user.h	3.65 KB
taskstats.h	6.83 KB
tc_act	-
tc_ematch	-
tcp.h	5.93 KB
tcp_metrics.h	1.45 KB
telephony.h	8.84 KB
termios.h	443 B
time.h	1.54 KB
times.h	215 B
timex.h	6.17 KB
tiocl.h	1.63 KB
tipc.h	5.44 KB
tipc_config.h	14.1 KB
toshiba.h	1.24 KB
tty.h	1.33 KB
tty_flags.h	3.66 KB
types.h	1.4 KB
udf_fs_i.h	634 B
udp.h	1.28 KB
uhid.h	2.15 KB
uinput.h	5 KB
uio.h	668 B
ultrasound.h	4.39 KB
un.h	239 B
unistd.h	157 B
unix_diag.h	1.1 KB
usb	-
usbdevice_fs.h	6.56 KB
userfaultfd.h	6.59 KB
utime.h	152 B
utsname.h	606 B
uuid.h	1.5 KB
uvcvideo.h	1.6 KB
v4l2-common.h	2.38 KB
v4l2-controls.h	37.34 KB
v4l2-dv-timings.h	25.75 KB
v4l2-mediabus.h	4.55 KB
v4l2-subdev.h	5.27 KB
version.h	255 B
veth.h	402 B
vfio.h	24.12 KB
vhost.h	7.13 KB
videodev2.h	67.41 KB
virtio_9p.h	1.99 KB
virtio_balloon.h	3.71 KB
virtio_blk.h	5.2 KB
virtio_config.h	3.24 KB
virtio_console.h	2.94 KB
virtio_gpu.h	7.84 KB
virtio_ids.h	2.32 KB
virtio_input.h	2.45 KB
virtio_net.h	9.4 KB
virtio_pci.h	6.63 KB
virtio_ring.h	6.18 KB
virtio_rng.h	265 B
virtio_scsi.h	5.13 KB
virtio_types.h	2.11 KB
virtio_vsock.h	3.01 KB
vm_sockets.h	5.13 KB
vsockmon.h	1.78 KB
vt.h	3.05 KB
vtpm_proxy.h	1.62 KB
vzcalluser.h	4.11 KB
vzctl_netstat.h	2.56 KB
vzctl_venet.h	641 B
vzctl_veth.h	758 B
vziptable_defs.h	3.03 KB
vzlist.h	845 B
wait.h	600 B
wanrouter.h	390 B
watchdog.h	2.22 KB
wimax	-
wimax.h	8.17 KB
wireless.h	41.65 KB
x25.h	3.42 KB
xattr.h	2.53 KB
xfrm.h	11 KB

Edit: 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__ */