Gecko [ oric.aiou.edu.pk ]

Name	Size	Permission
android	[ DIR ]	drwxr-xr-x
byteorder	[ DIR ]	drwxr-xr-x
caif	[ DIR ]	drwxr-xr-x
can	[ DIR ]	drwxr-xr-x
cifs	[ DIR ]	drwxr-xr-x
dvb	[ DIR ]	drwxr-xr-x
genwqe	[ DIR ]	drwxr-xr-x
hdlc	[ DIR ]	drwxr-xr-x
hsi	[ DIR ]	drwxr-xr-x
iio	[ DIR ]	drwxr-xr-x
isdn	[ DIR ]	drwxr-xr-x
mmc	[ DIR ]	drwxr-xr-x
netfilter	[ DIR ]	drwxr-xr-x
netfilter_arp	[ DIR ]	drwxr-xr-x
netfilter_bridge	[ DIR ]	drwxr-xr-x
netfilter_ipv4	[ DIR ]	drwxr-xr-x
netfilter_ipv6	[ DIR ]	drwxr-xr-x
nfsd	[ DIR ]	drwxr-xr-x
raid	[ DIR ]	drwxr-xr-x
sched	[ DIR ]	drwxr-xr-x
spi	[ DIR ]	drwxr-xr-x
sunrpc	[ DIR ]	drwxr-xr-x
tc_act	[ DIR ]	drwxr-xr-x
tc_ematch	[ DIR ]	drwxr-xr-x
usb	[ DIR ]	drwxr-xr-x
wimax	[ DIR ]	drwxr-xr-x
a.out.h	6.73 KB	-rw-r--r--
acct.h	3.65 KB	-rw-r--r--
adb.h	1.11 KB	-rw-r--r--
adfs_fs.h	993 B	-rw-r--r--
affs_hardblocks.h	1.54 KB	-rw-r--r--
agpgart.h	3.85 KB	-rw-r--r--
aio_abi.h	3.32 KB	-rw-r--r--
am437x-vpfe.h	3.59 KB	-rw-r--r--
apm_bios.h	3.6 KB	-rw-r--r--
arcfb.h	213 B	-rw-r--r--
arm_sdei.h	2.69 KB	-rw-r--r--
aspeed-lpc-ctrl.h	1.74 KB	-rw-r--r--
aspeed-p2a-ctrl.h	1.86 KB	-rw-r--r--
atalk.h	1023 B	-rw-r--r--
atm.h	7.7 KB	-rw-r--r--
atm_eni.h	648 B	-rw-r--r--
atm_he.h	406 B	-rw-r--r--
atm_idt77105.h	955 B	-rw-r--r--
atm_nicstar.h	1.25 KB	-rw-r--r--
atm_tcp.h	1.58 KB	-rw-r--r--
atm_zatm.h	1.5 KB	-rw-r--r--
atmapi.h	952 B	-rw-r--r--
atmarp.h	1.27 KB	-rw-r--r--
atmbr2684.h	3.19 KB	-rw-r--r--
atmclip.h	576 B	-rw-r--r--
atmdev.h	7.5 KB	-rw-r--r--
atmioc.h	1.61 KB	-rw-r--r--
atmlec.h	2.33 KB	-rw-r--r--
atmmpc.h	4.13 KB	-rw-r--r--
atmppp.h	639 B	-rw-r--r--
atmsap.h	4.85 KB	-rw-r--r--
atmsvc.h	1.81 KB	-rw-r--r--
audit.h	20.27 KB	-rw-r--r--
aufs_type.h	10.9 KB	-rw-r--r--
auto_dev-ioctl.h	4.87 KB	-rw-r--r--
auto_fs.h	6.28 KB	-rw-r--r--
auto_fs4.h	451 B	-rw-r--r--
auxvec.h	1.46 KB	-rw-r--r--
ax25.h	2.76 KB	-rw-r--r--
b1lli.h	1.68 KB	-rw-r--r--
batadv_packet.h	19.9 KB	-rw-r--r--
batman_adv.h	15.92 KB	-rw-r--r--
baycom.h	883 B	-rw-r--r--
bcache.h	8.23 KB	-rw-r--r--
bcm933xx_hcs.h	419 B	-rw-r--r--
bfs_fs.h	1.86 KB	-rw-r--r--
binfmts.h	628 B	-rw-r--r--
blkpg.h	1.6 KB	-rw-r--r--
blktrace_api.h	4.59 KB	-rw-r--r--
blkzoned.h	5.27 KB	-rw-r--r--
bpf.h	135.26 KB	-rw-r--r--
bpf_common.h	1.33 KB	-rw-r--r--
bpf_perf_event.h	529 B	-rw-r--r--
bpfilter.h	465 B	-rw-r--r--
bpqether.h	981 B	-rw-r--r--
bsg.h	2.44 KB	-rw-r--r--
bt-bmc.h	572 B	-rw-r--r--
btf.h	4.52 KB	-rw-r--r--
btrfs.h	28.62 KB	-rw-r--r--
btrfs_tree.h	24.91 KB	-rw-r--r--
can.h	8.02 KB	-rw-r--r--
capability.h	11.5 KB	-rw-r--r--
capi.h	3.05 KB	-rw-r--r--
cciss_defs.h	3.2 KB	-rw-r--r--
cciss_ioctl.h	2.7 KB	-rw-r--r--
cdrom.h	28.18 KB	-rw-r--r--
cec-funcs.h	52.37 KB	-rw-r--r--
cec.h	35.54 KB	-rw-r--r--
cgroupstats.h	2.17 KB	-rw-r--r--
chio.h	5.22 KB	-rw-r--r--
cm4000_cs.h	1.76 KB	-rw-r--r--
cn_proc.h	3.38 KB	-rw-r--r--
coda.h	17.79 KB	-rw-r--r--
coff.h	12.25 KB	-rw-r--r--
connector.h	2.2 KB	-rw-r--r--
const.h	991 B	-rw-r--r--
coresight-stm.h	706 B	-rw-r--r--
cramfs_fs.h	3.47 KB	-rw-r--r--
cryptouser.h	5.2 KB	-rw-r--r--
cuda.h	905 B	-rw-r--r--
cyclades.h	16.71 KB	-rw-r--r--
cycx_cfm.h	2.92 KB	-rw-r--r--
dcbnl.h	24.7 KB	-rw-r--r--
dccp.h	6.29 KB	-rw-r--r--
devlink.h	14.51 KB	-rw-r--r--
dlm.h	2.49 KB	-rw-r--r--
dlm_device.h	2.48 KB	-rw-r--r--
dlm_netlink.h	1.13 KB	-rw-r--r--
dlm_plock.h	894 B	-rw-r--r--
dlmconstants.h	4.96 KB	-rw-r--r--
dm-ioctl.h	10.73 KB	-rw-r--r--
dm-log-userspace.h	14.83 KB	-rw-r--r--
dma-buf.h	1.66 KB	-rw-r--r--
dns_resolver.h	3.86 KB	-rw-r--r--
dqblk_xfs.h	8.79 KB	-rw-r--r--
edd.h	5.47 KB	-rw-r--r--
efs_fs_sb.h	2.17 KB	-rw-r--r--
elf-em.h	2.53 KB	-rw-r--r--
elf-fdpic.h	1.1 KB	-rw-r--r--
elf.h	13.32 KB	-rw-r--r--
elfcore.h	2.92 KB	-rw-r--r--
errno.h	23 B	-rw-r--r--
errqueue.h	1.54 KB	-rw-r--r--
erspan.h	1.03 KB	-rw-r--r--
ethtool.h	73.03 KB	-rw-r--r--
eventpoll.h	2.68 KB	-rw-r--r--
fadvise.h	842 B	-rw-r--r--
falloc.h	3.5 KB	-rw-r--r--
fanotify.h	5.24 KB	-rw-r--r--
fb.h	16.03 KB	-rw-r--r--
fcntl.h	3.36 KB	-rw-r--r--
fd.h	11.4 KB	-rw-r--r--
fdreg.h	5.29 KB	-rw-r--r--
fib_rules.h	1.99 KB	-rw-r--r--
fiemap.h	2.71 KB	-rw-r--r--
filter.h	2.16 KB	-rw-r--r--
firewire-cdev.h	43.21 KB	-rw-r--r--
firewire-constants.h	3.16 KB	-rw-r--r--
fou.h	894 B	-rw-r--r--
fpga-dfl.h	5.96 KB	-rw-r--r--
fs.h	11.92 KB	-rw-r--r--
fscrypt.h	5.98 KB	-rw-r--r--
fsi.h	2.2 KB	-rw-r--r--
fsl_hypervisor.h	7.13 KB	-rw-r--r--
fsmap.h	4.29 KB	-rw-r--r--
fsverity.h	931 B	-rw-r--r--
fuse.h	19.93 KB	-rw-r--r--
futex.h	4.88 KB	-rw-r--r--
gameport.h	897 B	-rw-r--r--
gen_stats.h	1.56 KB	-rw-r--r--
genetlink.h	1.88 KB	-rw-r--r--
gfs2_ondisk.h	14.31 KB	-rw-r--r--
gigaset_dev.h	1.41 KB	-rw-r--r--
gpio.h	5.62 KB	-rw-r--r--
gsmmux.h	1.12 KB	-rw-r--r--
gtp.h	681 B	-rw-r--r--
hash_info.h	971 B	-rw-r--r--
hdlc.h	637 B	-rw-r--r--
hdlcdrv.h	2.84 KB	-rw-r--r--
hdreg.h	22.17 KB	-rw-r--r--
hid.h	1.86 KB	-rw-r--r--
hiddev.h	6.2 KB	-rw-r--r--
hidraw.h	1.48 KB	-rw-r--r--
hpet.h	743 B	-rw-r--r--
hsr_netlink.h	1.06 KB	-rw-r--r--
hw_breakpoint.h	742 B	-rw-r--r--
hyperv.h	10.32 KB	-rw-r--r--
hysdn_if.h	1.35 KB	-rw-r--r--
i2c-dev.h	2.55 KB	-rw-r--r--
i2c.h	6.96 KB	-rw-r--r--
i2o-dev.h	11.28 KB	-rw-r--r--
i8k.h	1.49 KB	-rw-r--r--
icmp.h	2.91 KB	-rw-r--r--
icmpv6.h	4.02 KB	-rw-r--r--
if.h	10.56 KB	-rw-r--r--
if_addr.h	1.84 KB	-rw-r--r--
if_addrlabel.h	721 B	-rw-r--r--
if_alg.h	1.5 KB	-rw-r--r--
if_arcnet.h	3.63 KB	-rw-r--r--
if_arp.h	6.41 KB	-rw-r--r--
if_bonding.h	4.73 KB	-rw-r--r--
if_bridge.h	7.1 KB	-rw-r--r--
if_cablemodem.h	986 B	-rw-r--r--
if_eql.h	1.32 KB	-rw-r--r--
if_ether.h	8.03 KB	-rw-r--r--
if_fc.h	1.7 KB	-rw-r--r--
if_fddi.h	4.27 KB	-rw-r--r--
if_frad.h	2.95 KB	-rw-r--r--
if_hippi.h	4.14 KB	-rw-r--r--
if_infiniband.h	1.22 KB	-rw-r--r--
if_link.h	23.12 KB	-rw-r--r--
if_ltalk.h	210 B	-rw-r--r--
if_macsec.h	5.7 KB	-rw-r--r--
if_packet.h	7.77 KB	-rw-r--r--
if_phonet.h	424 B	-rw-r--r--
if_plip.h	660 B	-rw-r--r--
if_ppp.h	29 B	-rw-r--r--
if_pppol2tp.h	3.21 KB	-rw-r--r--
if_pppox.h	4.76 KB	-rw-r--r--
if_slip.h	872 B	-rw-r--r--
if_team.h	2.54 KB	-rw-r--r--
if_tun.h	4 KB	-rw-r--r--
if_tunnel.h	4.72 KB	-rw-r--r--
if_vlan.h	1.79 KB	-rw-r--r--
if_x25.h	881 B	-rw-r--r--
if_xdp.h	2.75 KB	-rw-r--r--
ife.h	351 B	-rw-r--r--
igmp.h	2.99 KB	-rw-r--r--
ila.h	1.22 KB	-rw-r--r--
in.h	9.84 KB	-rw-r--r--
in6.h	7.33 KB	-rw-r--r--
in_route.h	936 B	-rw-r--r--
inet_diag.h	4.43 KB	-rw-r--r--
inotify.h	3.21 KB	-rw-r--r--
input-event-codes.h	24.97 KB	-rw-r--r--
input.h	15.61 KB	-rw-r--r--
io_uring.h	3.4 KB	-rw-r--r--
ioctl.h	163 B	-rw-r--r--
iommu.h	4.47 KB	-rw-r--r--
ip.h	4.62 KB	-rw-r--r--
ip6_tunnel.h	1.91 KB	-rw-r--r--
ip_vs.h	13.8 KB	-rw-r--r--
ipc.h	2.05 KB	-rw-r--r--
ipmi.h	14.7 KB	-rw-r--r--
ipmi_bmc.h	488 B	-rw-r--r--
ipmi_msgdefs.h	3.27 KB	-rw-r--r--
ipsec.h	947 B	-rw-r--r--
ipv6.h	3.87 KB	-rw-r--r--
ipv6_route.h	1.86 KB	-rw-r--r--
ipx.h	2.29 KB	-rw-r--r--
irqnr.h	104 B	-rw-r--r--
iso_fs.h	6.33 KB	-rw-r--r--
isst_if.h	5.28 KB	-rw-r--r--
ivtv.h	2.95 KB	-rw-r--r--
ivtvfb.h	1.18 KB	-rw-r--r--
jffs2.h	6.66 KB	-rw-r--r--
joystick.h	3.35 KB	-rw-r--r--
kcm.h	822 B	-rw-r--r--
kcmp.h	522 B	-rw-r--r--
kcov.h	1.07 KB	-rw-r--r--
kd.h	6.14 KB	-rw-r--r--
kdev_t.h	383 B	-rw-r--r--
kernel-page-flags.h	900 B	-rw-r--r--
kernel.h	194 B	-rw-r--r--
kernelcapi.h	1019 B	-rw-r--r--
kexec.h	1.83 KB	-rw-r--r--
keyboard.h	13.14 KB	-rw-r--r--
keyctl.h	5.7 KB	-rw-r--r--
kfd_ioctl.h	15.88 KB	-rw-r--r--
kvm.h	46.5 KB	-rw-r--r--
kvm_para.h	968 B	-rw-r--r--
l2tp.h	5.54 KB	-rw-r--r--
libc-compat.h	8.09 KB	-rw-r--r--
lightnvm.h	4.92 KB	-rw-r--r--
limits.h	937 B	-rw-r--r--
lirc.h	7.91 KB	-rw-r--r--
llc.h	3.09 KB	-rw-r--r--
loop.h	2.46 KB	-rw-r--r--
lp.h	4.09 KB	-rw-r--r--
lwtunnel.h	1.24 KB	-rw-r--r--
magic.h	3.6 KB	-rw-r--r--
major.h	4.6 KB	-rw-r--r--
map_to_7segment.h	7.08 KB	-rw-r--r--
matroxfb.h	1.43 KB	-rw-r--r--
max2175.h	1.01 KB	-rw-r--r--
mdio.h	15.28 KB	-rw-r--r--
media-bus-format.h	6.66 KB	-rw-r--r--
media.h	12.34 KB	-rw-r--r--
mei.h	1.95 KB	-rw-r--r--
membarrier.h	7.71 KB	-rw-r--r--
memfd.h	1.29 KB	-rw-r--r--
mempolicy.h	2.1 KB	-rw-r--r--
meye.h	2.47 KB	-rw-r--r--
mic_common.h	6.37 KB	-rw-r--r--
mic_ioctl.h	2.2 KB	-rw-r--r--
mii.h	8.09 KB	-rw-r--r--
minix_fs.h	2.07 KB	-rw-r--r--
mman.h	1.47 KB	-rw-r--r--
mmtimer.h	2.07 KB	-rw-r--r--
module.h	255 B	-rw-r--r--
mount.h	4.44 KB	-rw-r--r--
mpls.h	2.25 KB	-rw-r--r--
mpls_iptunnel.h	761 B	-rw-r--r--
mqueue.h	2.15 KB	-rw-r--r--
mroute.h	5.74 KB	-rw-r--r--
mroute6.h	4.81 KB	-rw-r--r--
msdos_fs.h	6.57 KB	-rw-r--r--
msg.h	3.29 KB	-rw-r--r--
mtio.h	7.98 KB	-rw-r--r--
n_r3964.h	2.35 KB	-rw-r--r--
nbd-netlink.h	2.32 KB	-rw-r--r--
nbd.h	2.95 KB	-rw-r--r--
ncsi.h	4.71 KB	-rw-r--r--
ndctl.h	6.61 KB	-rw-r--r--
neighbour.h	4.3 KB	-rw-r--r--
net.h	2.04 KB	-rw-r--r--
net_dropmon.h	2.77 KB	-rw-r--r--
net_namespace.h	715 B	-rw-r--r--
net_tstamp.h	4.8 KB	-rw-r--r--
netconf.h	614 B	-rw-r--r--
netdevice.h	2.2 KB	-rw-r--r--
netfilter.h	1.63 KB	-rw-r--r--
netfilter_arp.h	445 B	-rw-r--r--
netfilter_bridge.h	1.14 KB	-rw-r--r--
netfilter_ipv4.h	1.45 KB	-rw-r--r--
netfilter_ipv6.h	1.35 KB	-rw-r--r--
netlink.h	7.65 KB	-rw-r--r--
netlink_diag.h	1.49 KB	-rw-r--r--
netrom.h	807 B	-rw-r--r--
nexthop.h	1.5 KB	-rw-r--r--
nfc.h	10.97 KB	-rw-r--r--
nfs.h	4.39 KB	-rw-r--r--
nfs2.h	1.43 KB	-rw-r--r--
nfs3.h	2.3 KB	-rw-r--r--
nfs4.h	6.28 KB	-rw-r--r--
nfs4_mount.h	1.89 KB	-rw-r--r--
nfs_fs.h	1.57 KB	-rw-r--r--
nfs_idmap.h	2.19 KB	-rw-r--r--
nfs_mount.h	2.09 KB	-rw-r--r--
nfsacl.h	668 B	-rw-r--r--
nilfs2_api.h	7.41 KB	-rw-r--r--
nilfs2_ondisk.h	17.66 KB	-rw-r--r--
nl80211.h	274.14 KB	-rw-r--r--
nsfs.h	639 B	-rw-r--r--
nubus.h	8 KB	-rw-r--r--
nvme_ioctl.h	1.62 KB	-rw-r--r--
nvram.h	532 B	-rw-r--r--
omap3isp.h	20.36 KB	-rw-r--r--
omapfb.h	5.78 KB	-rw-r--r--
oom.h	511 B	-rw-r--r--
openvswitch.h	36.79 KB	-rw-r--r--
packet_diag.h	1.63 KB	-rw-r--r--
param.h	141 B	-rw-r--r--
parport.h	3.56 KB	-rw-r--r--
patchkey.h	892 B	-rw-r--r--
pci.h	1.35 KB	-rw-r--r--
pci_regs.h	55.89 KB	-rw-r--r--
pcitest.h	711 B	-rw-r--r--
perf_event.h	33.55 KB	-rw-r--r--
personality.h	2.05 KB	-rw-r--r--
pfkeyv2.h	10.32 KB	-rw-r--r--
pg.h	2.34 KB	-rw-r--r--
phantom.h	1.62 KB	-rw-r--r--
phonet.h	4.57 KB	-rw-r--r--
pkt_cls.h	15.08 KB	-rw-r--r--
pkt_sched.h	27.04 KB	-rw-r--r--
pktcdvd.h	2.62 KB	-rw-r--r--
pmu.h	5.32 KB	-rw-r--r--
poll.h	22 B	-rw-r--r--
posix_acl.h	1.22 KB	-rw-r--r--
posix_acl_xattr.h	1.09 KB	-rw-r--r--
posix_types.h	1.07 KB	-rw-r--r--
ppdev.h	3.21 KB	-rw-r--r--
ppp-comp.h	2.47 KB	-rw-r--r--
ppp-ioctl.h	5.31 KB	-rw-r--r--
ppp_defs.h	4.99 KB	-rw-r--r--
pps.h	4.62 KB	-rw-r--r--
pr.h	1.05 KB	-rw-r--r--
prctl.h	7.88 KB	-rw-r--r--
psample.h	798 B	-rw-r--r--
psci.h	4.23 KB	-rw-r--r--
psp-sev.h	3.94 KB	-rw-r--r--
ptp_clock.h	6.57 KB	-rw-r--r--
ptrace.h	4.14 KB	-rw-r--r--
qemu_fw_cfg.h	2.41 KB	-rw-r--r--
qnx4_fs.h	2.27 KB	-rw-r--r--
qnxtypes.h	624 B	-rw-r--r--
qrtr.h	893 B	-rw-r--r--
quota.h	6.14 KB	-rw-r--r--
radeonfb.h	360 B	-rw-r--r--
random.h	1.38 KB	-rw-r--r--
raw.h	365 B	-rw-r--r--
rds.h	10.82 KB	-rw-r--r--
reboot.h	1.31 KB	-rw-r--r--
reiserfs_fs.h	775 B	-rw-r--r--
reiserfs_xattr.h	533 B	-rw-r--r--
resource.h	2.32 KB	-rw-r--r--
rfkill.h	3.6 KB	-rw-r--r--
rio_cm_cdev.h	3.17 KB	-rw-r--r--
rio_mport_cdev.h	9.11 KB	-rw-r--r--
romfs_fs.h	1.21 KB	-rw-r--r--
rose.h	2.18 KB	-rw-r--r--
route.h	2.28 KB	-rw-r--r--
rpmsg.h	544 B	-rw-r--r--
rseq.h	4.79 KB	-rw-r--r--
rtc.h	3.92 KB	-rw-r--r--
rtnetlink.h	18.61 KB	-rw-r--r--
rxrpc.h	4.78 KB	-rw-r--r--
scc.h	4.49 KB	-rw-r--r--
sched.h	4.54 KB	-rw-r--r--
scif_ioctl.h	6.23 KB	-rw-r--r--
screen_info.h	2.42 KB	-rw-r--r--
sctp.h	33.97 KB	-rw-r--r--
sdla.h	2.77 KB	-rw-r--r--
seccomp.h	4.82 KB	-rw-r--r--
securebits.h	2.64 KB	-rw-r--r--
sed-opal.h	3.22 KB	-rw-r--r--
seg6.h	1.14 KB	-rw-r--r--
seg6_genl.h	589 B	-rw-r--r--
seg6_hmac.h	423 B	-rw-r--r--
seg6_iptunnel.h	927 B	-rw-r--r--
seg6_local.h	2.01 KB	-rw-r--r--
selinux_netlink.h	1.17 KB	-rw-r--r--
sem.h	2.97 KB	-rw-r--r--
serial.h	3.78 KB	-rw-r--r--
serial_core.h	6.29 KB	-rw-r--r--
serial_reg.h	15.19 KB	-rw-r--r--
serio.h	2.05 KB	-rw-r--r--
shm.h	3.7 KB	-rw-r--r--
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Code Editor : btrfs_tree.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _BTRFS_CTREE_H_
#define _BTRFS_CTREE_H_

#include <linux/btrfs.h>
#include <linux/types.h>
#include <stddef.h>

/*
 * This header contains the structure definitions and constants used
 * by file system objects that can be retrieved using
 * the BTRFS_IOC_SEARCH_TREE ioctl.  That means basically anything that
 * is needed to describe a leaf node's key or item contents.
 */

/* holds pointers to all of the tree roots */
#define BTRFS_ROOT_TREE_OBJECTID 1ULL

/* stores information about which extents are in use, and reference counts */
#define BTRFS_EXTENT_TREE_OBJECTID 2ULL

/*
 * chunk tree stores translations from logical -> physical block numbering
 * the super block points to the chunk tree
 */
#define BTRFS_CHUNK_TREE_OBJECTID 3ULL

/*
 * stores information about which areas of a given device are in use.
 * one per device.  The tree of tree roots points to the device tree
 */
#define BTRFS_DEV_TREE_OBJECTID 4ULL

/* one per subvolume, storing files and directories */
#define BTRFS_FS_TREE_OBJECTID 5ULL

/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL

/* holds checksums of all the data extents */
#define BTRFS_CSUM_TREE_OBJECTID 7ULL

/* holds quota configuration and tracking */
#define BTRFS_QUOTA_TREE_OBJECTID 8ULL

/* for storing items that use the BTRFS_UUID_KEY* types */
#define BTRFS_UUID_TREE_OBJECTID 9ULL

/* tracks free space in block groups. */
#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL

/* device stats in the device tree */
#define BTRFS_DEV_STATS_OBJECTID 0ULL

/* for storing balance parameters in the root tree */
#define BTRFS_BALANCE_OBJECTID -4ULL

/* orhpan objectid for tracking unlinked/truncated files */
#define BTRFS_ORPHAN_OBJECTID -5ULL

/* does write ahead logging to speed up fsyncs */
#define BTRFS_TREE_LOG_OBJECTID -6ULL
#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL

/* for space balancing */
#define BTRFS_TREE_RELOC_OBJECTID -8ULL
#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL

/*
 * extent checksums all have this objectid
 * this allows them to share the logging tree
 * for fsyncs
 */
#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL

/* For storing free space cache */
#define BTRFS_FREE_SPACE_OBJECTID -11ULL

/*
 * The inode number assigned to the special inode for storing
 * free ino cache
 */
#define BTRFS_FREE_INO_OBJECTID -12ULL

/* dummy objectid represents multiple objectids */
#define BTRFS_MULTIPLE_OBJECTIDS -255ULL

/*
 * All files have objectids in this range.
 */
#define BTRFS_FIRST_FREE_OBJECTID 256ULL
#define BTRFS_LAST_FREE_OBJECTID -256ULL
#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL

/*
 * the device items go into the chunk tree.  The key is in the form
 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 */
#define BTRFS_DEV_ITEMS_OBJECTID 1ULL

#define BTRFS_BTREE_INODE_OBJECTID 1

#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2

#define BTRFS_DEV_REPLACE_DEVID 0ULL

/*
 * inode items have the data typically returned from stat and store other
 * info about object characteristics.  There is one for every file and dir in
 * the FS
 */
#define BTRFS_INODE_ITEM_KEY		1
#define BTRFS_INODE_REF_KEY		12
#define BTRFS_INODE_EXTREF_KEY		13
#define BTRFS_XATTR_ITEM_KEY		24
#define BTRFS_ORPHAN_ITEM_KEY		48
/* reserve 2-15 close to the inode for later flexibility */

/*
 * dir items are the name -> inode pointers in a directory.  There is one
 * for every name in a directory.
 */
#define BTRFS_DIR_LOG_ITEM_KEY  60
#define BTRFS_DIR_LOG_INDEX_KEY 72
#define BTRFS_DIR_ITEM_KEY	84
#define BTRFS_DIR_INDEX_KEY	96
/*
 * extent data is for file data
 */
#define BTRFS_EXTENT_DATA_KEY	108

/*
 * extent csums are stored in a separate tree and hold csums for
 * an entire extent on disk.
 */
#define BTRFS_EXTENT_CSUM_KEY	128

/*
 * root items point to tree roots.  They are typically in the root
 * tree used by the super block to find all the other trees
 */
#define BTRFS_ROOT_ITEM_KEY	132

/*
 * root backrefs tie subvols and snapshots to the directory entries that
 * reference them
 */
#define BTRFS_ROOT_BACKREF_KEY	144

/*
 * root refs make a fast index for listing all of the snapshots and
 * subvolumes referenced by a given root.  They point directly to the
 * directory item in the root that references the subvol
 */
#define BTRFS_ROOT_REF_KEY	156

/*
 * extent items are in the extent map tree.  These record which blocks
 * are used, and how many references there are to each block
 */
#define BTRFS_EXTENT_ITEM_KEY	168

/*
 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
 * the length, so we save the level in key->offset instead of the length.
 */
#define BTRFS_METADATA_ITEM_KEY	169

#define BTRFS_TREE_BLOCK_REF_KEY	176

#define BTRFS_EXTENT_DATA_REF_KEY	178

#define BTRFS_EXTENT_REF_V0_KEY		180

#define BTRFS_SHARED_BLOCK_REF_KEY	182

#define BTRFS_SHARED_DATA_REF_KEY	184

/*
 * block groups give us hints into the extent allocation trees.  Which
 * blocks are free etc etc
 */
#define BTRFS_BLOCK_GROUP_ITEM_KEY 192

/*
 * Every block group is represented in the free space tree by a free space info
 * item, which stores some accounting information. It is keyed on
 * (block_group_start, FREE_SPACE_INFO, block_group_length).
 */
#define BTRFS_FREE_SPACE_INFO_KEY 198

/*
 * A free space extent tracks an extent of space that is free in a block group.
 * It is keyed on (start, FREE_SPACE_EXTENT, length).
 */
#define BTRFS_FREE_SPACE_EXTENT_KEY 199

/*
 * When a block group becomes very fragmented, we convert it to use bitmaps
 * instead of extents. A free space bitmap is keyed on
 * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
 * (length / sectorsize) bits.
 */
#define BTRFS_FREE_SPACE_BITMAP_KEY 200

#define BTRFS_DEV_EXTENT_KEY	204
#define BTRFS_DEV_ITEM_KEY	216
#define BTRFS_CHUNK_ITEM_KEY	228

/*
 * Records the overall state of the qgroups.
 * There's only one instance of this key present,
 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
 */
#define BTRFS_QGROUP_STATUS_KEY         240
/*
 * Records the currently used space of the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
 */
#define BTRFS_QGROUP_INFO_KEY           242
/*
 * Contains the user configured limits for the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
 */
#define BTRFS_QGROUP_LIMIT_KEY          244
/*
 * Records the child-parent relationship of qgroups. For
 * each relation, 2 keys are present:
 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
 */
#define BTRFS_QGROUP_RELATION_KEY       246

/*
 * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
 */
#define BTRFS_BALANCE_ITEM_KEY	248

/*
 * The key type for tree items that are stored persistently, but do not need to
 * exist for extended period of time. The items can exist in any tree.
 *
 * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
 *
 * Existing items:
 *
 * - balance status item
 *   (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
 */
#define BTRFS_TEMPORARY_ITEM_KEY	248

/*
 * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
 */
#define BTRFS_DEV_STATS_KEY		249

/*
 * The key type for tree items that are stored persistently and usually exist
 * for a long period, eg. filesystem lifetime. The item kinds can be status
 * information, stats or preference values. The item can exist in any tree.
 *
 * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
 *
 * Existing items:
 *
 * - device statistics, store IO stats in the device tree, one key for all
 *   stats
 *   (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
 */
#define BTRFS_PERSISTENT_ITEM_KEY	249

/*
 * Persistantly stores the device replace state in the device tree.
 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
 */
#define BTRFS_DEV_REPLACE_KEY	250

/*
 * Stores items that allow to quickly map UUIDs to something else.
 * These items are part of the filesystem UUID tree.
 * The key is built like this:
 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
 */
#if BTRFS_UUID_SIZE != 16
#error "UUID items require BTRFS_UUID_SIZE == 16!"
#endif
#define BTRFS_UUID_KEY_SUBVOL	251	/* for UUIDs assigned to subvols */
#define BTRFS_UUID_KEY_RECEIVED_SUBVOL	252	/* for UUIDs assigned to
						 * received subvols */

/*
 * string items are for debugging.  They just store a short string of
 * data in the FS
 */
#define BTRFS_STRING_ITEM_KEY	253

/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32

/* csum types */
enum btrfs_csum_type {
	BTRFS_CSUM_TYPE_CRC32	= 0,
};

/*
 * flags definitions for directory entry item type
 *
 * Used by:
 * struct btrfs_dir_item.type
 *
 * Values 0..7 must match common file type values in fs_types.h.
 */
#define BTRFS_FT_UNKNOWN	0
#define BTRFS_FT_REG_FILE	1
#define BTRFS_FT_DIR		2
#define BTRFS_FT_CHRDEV		3
#define BTRFS_FT_BLKDEV		4
#define BTRFS_FT_FIFO		5
#define BTRFS_FT_SOCK		6
#define BTRFS_FT_SYMLINK	7
#define BTRFS_FT_XATTR		8
#define BTRFS_FT_MAX		9

/*
 * The key defines the order in the tree, and so it also defines (optimal)
 * block layout.
 *
 * objectid corresponds to the inode number.
 *
 * type tells us things about the object, and is a kind of stream selector.
 * so for a given inode, keys with type of 1 might refer to the inode data,
 * type of 2 may point to file data in the btree and type == 3 may point to
 * extents.
 *
 * offset is the starting byte offset for this key in the stream.
 *
 * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 * in cpu native order.  Otherwise they are identical and their sizes
 * should be the same (ie both packed)
 */
struct btrfs_disk_key {
	__le64 objectid;
	__u8 type;
	__le64 offset;
} __attribute__ ((__packed__));

struct btrfs_key {
	__u64 objectid;
	__u8 type;
	__u64 offset;
} __attribute__ ((__packed__));

struct btrfs_dev_item {
	/* the internal btrfs device id */
	__le64 devid;

/* size of the device */
	__le64 total_bytes;

/* bytes used */
	__le64 bytes_used;

/* optimal io alignment for this device */
	__le32 io_align;

/* optimal io width for this device */
	__le32 io_width;

/* minimal io size for this device */
	__le32 sector_size;

/* type and info about this device */
	__le64 type;

/* expected generation for this device */
	__le64 generation;

/*
	 * starting byte of this partition on the device,
	 * to allow for stripe alignment in the future
	 */
	__le64 start_offset;

/* grouping information for allocation decisions */
	__le32 dev_group;

/* seek speed 0-100 where 100 is fastest */
	__u8 seek_speed;

/* bandwidth 0-100 where 100 is fastest */
	__u8 bandwidth;

/* btrfs generated uuid for this device */
	__u8 uuid[BTRFS_UUID_SIZE];

/* uuid of FS who owns this device */
	__u8 fsid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

struct btrfs_stripe {
	__le64 devid;
	__le64 offset;
	__u8 dev_uuid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

struct btrfs_chunk {
	/* size of this chunk in bytes */
	__le64 length;

/* objectid of the root referencing this chunk */
	__le64 owner;

__le64 stripe_len;
	__le64 type;

/* optimal io alignment for this chunk */
	__le32 io_align;

/* optimal io width for this chunk */
	__le32 io_width;

/* minimal io size for this chunk */
	__le32 sector_size;

/* 2^16 stripes is quite a lot, a second limit is the size of a single
	 * item in the btree
	 */
	__le16 num_stripes;

/* sub stripes only matter for raid10 */
	__le16 sub_stripes;
	struct btrfs_stripe stripe;
	/* additional stripes go here */
} __attribute__ ((__packed__));

#define BTRFS_FREE_SPACE_EXTENT	1
#define BTRFS_FREE_SPACE_BITMAP	2

struct btrfs_free_space_entry {
	__le64 offset;
	__le64 bytes;
	__u8 type;
} __attribute__ ((__packed__));

struct btrfs_free_space_header {
	struct btrfs_disk_key location;
	__le64 generation;
	__le64 num_entries;
	__le64 num_bitmaps;
} __attribute__ ((__packed__));

#define BTRFS_HEADER_FLAG_WRITTEN	(1ULL << 0)
#define BTRFS_HEADER_FLAG_RELOC		(1ULL << 1)

/* Super block flags */
/* Errors detected */
#define BTRFS_SUPER_FLAG_ERROR		(1ULL << 2)

#define BTRFS_SUPER_FLAG_SEEDING	(1ULL << 32)
#define BTRFS_SUPER_FLAG_METADUMP	(1ULL << 33)
#define BTRFS_SUPER_FLAG_METADUMP_V2	(1ULL << 34)
#define BTRFS_SUPER_FLAG_CHANGING_FSID	(1ULL << 35)
#define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36)

/*
 * items in the extent btree are used to record the objectid of the
 * owner of the block and the number of references
 */

struct btrfs_extent_item {
	__le64 refs;
	__le64 generation;
	__le64 flags;
} __attribute__ ((__packed__));

struct btrfs_extent_item_v0 {
	__le32 refs;
} __attribute__ ((__packed__));

#define BTRFS_EXTENT_FLAG_DATA		(1ULL << 0)
#define BTRFS_EXTENT_FLAG_TREE_BLOCK	(1ULL << 1)

/* following flags only apply to tree blocks */

/* use full backrefs for extent pointers in the block */
#define BTRFS_BLOCK_FLAG_FULL_BACKREF	(1ULL << 8)

/*
 * this flag is only used internally by scrub and may be changed at any time
 * it is only declared here to avoid collisions
 */
#define BTRFS_EXTENT_FLAG_SUPER		(1ULL << 48)

struct btrfs_tree_block_info {
	struct btrfs_disk_key key;
	__u8 level;
} __attribute__ ((__packed__));

struct btrfs_extent_data_ref {
	__le64 root;
	__le64 objectid;
	__le64 offset;
	__le32 count;
} __attribute__ ((__packed__));

struct btrfs_shared_data_ref {
	__le32 count;
} __attribute__ ((__packed__));

struct btrfs_extent_inline_ref {
	__u8 type;
	__le64 offset;
} __attribute__ ((__packed__));

/* old style backrefs item */
struct btrfs_extent_ref_v0 {
	__le64 root;
	__le64 generation;
	__le64 objectid;
	__le32 count;
} __attribute__ ((__packed__));

/* dev extents record free space on individual devices.  The owner
 * field points back to the chunk allocation mapping tree that allocated
 * the extent.  The chunk tree uuid field is a way to double check the owner
 */
struct btrfs_dev_extent {
	__le64 chunk_tree;
	__le64 chunk_objectid;
	__le64 chunk_offset;
	__le64 length;
	__u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

struct btrfs_inode_ref {
	__le64 index;
	__le16 name_len;
	/* name goes here */
} __attribute__ ((__packed__));

struct btrfs_inode_extref {
	__le64 parent_objectid;
	__le64 index;
	__le16 name_len;
	__u8   name[0];
	/* name goes here */
} __attribute__ ((__packed__));

struct btrfs_timespec {
	__le64 sec;
	__le32 nsec;
} __attribute__ ((__packed__));

struct btrfs_inode_item {
	/* nfs style generation number */
	__le64 generation;
	/* transid that last touched this inode */
	__le64 transid;
	__le64 size;
	__le64 nbytes;
	__le64 block_group;
	__le32 nlink;
	__le32 uid;
	__le32 gid;
	__le32 mode;
	__le64 rdev;
	__le64 flags;

/* modification sequence number for NFS */
	__le64 sequence;

/*
	 * a little future expansion, for more than this we can
	 * just grow the inode item and version it
	 */
	__le64 reserved[4];
	struct btrfs_timespec atime;
	struct btrfs_timespec ctime;
	struct btrfs_timespec mtime;
	struct btrfs_timespec otime;
} __attribute__ ((__packed__));

struct btrfs_dir_log_item {
	__le64 end;
} __attribute__ ((__packed__));

struct btrfs_dir_item {
	struct btrfs_disk_key location;
	__le64 transid;
	__le16 data_len;
	__le16 name_len;
	__u8 type;
} __attribute__ ((__packed__));

#define BTRFS_ROOT_SUBVOL_RDONLY	(1ULL << 0)

/*
 * Internal in-memory flag that a subvolume has been marked for deletion but
 * still visible as a directory
 */
#define BTRFS_ROOT_SUBVOL_DEAD		(1ULL << 48)

struct btrfs_root_item {
	struct btrfs_inode_item inode;
	__le64 generation;
	__le64 root_dirid;
	__le64 bytenr;
	__le64 byte_limit;
	__le64 bytes_used;
	__le64 last_snapshot;
	__le64 flags;
	__le32 refs;
	struct btrfs_disk_key drop_progress;
	__u8 drop_level;
	__u8 level;

/*
	 * The following fields appear after subvol_uuids+subvol_times
	 * were introduced.
	 */

/*
	 * This generation number is used to test if the new fields are valid
	 * and up to date while reading the root item. Every time the root item
	 * is written out, the "generation" field is copied into this field. If
	 * anyone ever mounted the fs with an older kernel, we will have
	 * mismatching generation values here and thus must invalidate the
	 * new fields. See btrfs_update_root and btrfs_find_last_root for
	 * details.
	 * the offset of generation_v2 is also used as the start for the memset
	 * when invalidating the fields.
	 */
	__le64 generation_v2;
	__u8 uuid[BTRFS_UUID_SIZE];
	__u8 parent_uuid[BTRFS_UUID_SIZE];
	__u8 received_uuid[BTRFS_UUID_SIZE];
	__le64 ctransid; /* updated when an inode changes */
	__le64 otransid; /* trans when created */
	__le64 stransid; /* trans when sent. non-zero for received subvol */
	__le64 rtransid; /* trans when received. non-zero for received subvol */
	struct btrfs_timespec ctime;
	struct btrfs_timespec otime;
	struct btrfs_timespec stime;
	struct btrfs_timespec rtime;
	__le64 reserved[8]; /* for future */
} __attribute__ ((__packed__));

/*
 * Btrfs root item used to be smaller than current size.  The old format ends
 * at where member generation_v2 is.
 */
static __inline__ __u32 btrfs_legacy_root_item_size(void)
{
	return offsetof(struct btrfs_root_item, generation_v2);
}

/*
 * this is used for both forward and backward root refs
 */
struct btrfs_root_ref {
	__le64 dirid;
	__le64 sequence;
	__le16 name_len;
} __attribute__ ((__packed__));

struct btrfs_disk_balance_args {
	/*
	 * profiles to operate on, single is denoted by
	 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
	 */
	__le64 profiles;

/*
	 * usage filter
	 * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
	 * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
	 */
	union {
		__le64 usage;
		struct {
			__le32 usage_min;
			__le32 usage_max;
		};
	};

/* devid filter */
	__le64 devid;

/* devid subset filter [pstart..pend) */
	__le64 pstart;
	__le64 pend;

/* btrfs virtual address space subset filter [vstart..vend) */
	__le64 vstart;
	__le64 vend;

/*
	 * profile to convert to, single is denoted by
	 * BTRFS_AVAIL_ALLOC_BIT_SINGLE
	 */
	__le64 target;

/* BTRFS_BALANCE_ARGS_* */
	__le64 flags;

/*
	 * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
	 * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
	 * and maximum
	 */
	union {
		__le64 limit;
		struct {
			__le32 limit_min;
			__le32 limit_max;
		};
	};

/*
	 * Process chunks that cross stripes_min..stripes_max devices,
	 * BTRFS_BALANCE_ARGS_STRIPES_RANGE
	 */
	__le32 stripes_min;
	__le32 stripes_max;

__le64 unused[6];
} __attribute__ ((__packed__));

/*
 * store balance parameters to disk so that balance can be properly
 * resumed after crash or unmount
 */
struct btrfs_balance_item {
	/* BTRFS_BALANCE_* */
	__le64 flags;

struct btrfs_disk_balance_args data;
	struct btrfs_disk_balance_args meta;
	struct btrfs_disk_balance_args sys;

__le64 unused[4];
} __attribute__ ((__packed__));

#define BTRFS_FILE_EXTENT_INLINE 0
#define BTRFS_FILE_EXTENT_REG 1
#define BTRFS_FILE_EXTENT_PREALLOC 2
#define BTRFS_FILE_EXTENT_TYPES	2

struct btrfs_file_extent_item {
	/*
	 * transaction id that created this extent
	 */
	__le64 generation;
	/*
	 * max number of bytes to hold this extent in ram
	 * when we split a compressed extent we can't know how big
	 * each of the resulting pieces will be.  So, this is
	 * an upper limit on the size of the extent in ram instead of
	 * an exact limit.
	 */
	__le64 ram_bytes;

/*
	 * 32 bits for the various ways we might encode the data,
	 * including compression and encryption.  If any of these
	 * are set to something a given disk format doesn't understand
	 * it is treated like an incompat flag for reading and writing,
	 * but not for stat.
	 */
	__u8 compression;
	__u8 encryption;
	__le16 other_encoding; /* spare for later use */

/* are we __inline__ data or a real extent? */
	__u8 type;

/*
	 * disk space consumed by the extent, checksum blocks are included
	 * in these numbers
	 *
	 * At this offset in the structure, the __inline__ extent data start.
	 */
	__le64 disk_bytenr;
	__le64 disk_num_bytes;
	/*
	 * the logical offset in file blocks (no csums)
	 * this extent record is for.  This allows a file extent to point
	 * into the middle of an existing extent on disk, sharing it
	 * between two snapshots (useful if some bytes in the middle of the
	 * extent have changed
	 */
	__le64 offset;
	/*
	 * the logical number of file blocks (no csums included).  This
	 * always reflects the size uncompressed and without encoding.
	 */
	__le64 num_bytes;

} __attribute__ ((__packed__));

struct btrfs_csum_item {
	__u8 csum;
} __attribute__ ((__packed__));

struct btrfs_dev_stats_item {
	/*
	 * grow this item struct at the end for future enhancements and keep
	 * the existing values unchanged
	 */
	__le64 values[BTRFS_DEV_STAT_VALUES_MAX];
} __attribute__ ((__packed__));

#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS	0
#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID	1

struct btrfs_dev_replace_item {
	/*
	 * grow this item struct at the end for future enhancements and keep
	 * the existing values unchanged
	 */
	__le64 src_devid;
	__le64 cursor_left;
	__le64 cursor_right;
	__le64 cont_reading_from_srcdev_mode;

__le64 replace_state;
	__le64 time_started;
	__le64 time_stopped;
	__le64 num_write_errors;
	__le64 num_uncorrectable_read_errors;
} __attribute__ ((__packed__));

/* different types of block groups (and chunks) */
#define BTRFS_BLOCK_GROUP_DATA		(1ULL << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM	(1ULL << 1)
#define BTRFS_BLOCK_GROUP_METADATA	(1ULL << 2)
#define BTRFS_BLOCK_GROUP_RAID0		(1ULL << 3)
#define BTRFS_BLOCK_GROUP_RAID1		(1ULL << 4)
#define BTRFS_BLOCK_GROUP_DUP		(1ULL << 5)
#define BTRFS_BLOCK_GROUP_RAID10	(1ULL << 6)
#define BTRFS_BLOCK_GROUP_RAID5         (1ULL << 7)
#define BTRFS_BLOCK_GROUP_RAID6         (1ULL << 8)
#define BTRFS_BLOCK_GROUP_RESERVED	(BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
					 BTRFS_SPACE_INFO_GLOBAL_RSV)

enum btrfs_raid_types {
	BTRFS_RAID_RAID10,
	BTRFS_RAID_RAID1,
	BTRFS_RAID_DUP,
	BTRFS_RAID_RAID0,
	BTRFS_RAID_SINGLE,
	BTRFS_RAID_RAID5,
	BTRFS_RAID_RAID6,
	BTRFS_NR_RAID_TYPES
};

#define BTRFS_BLOCK_GROUP_TYPE_MASK	(BTRFS_BLOCK_GROUP_DATA |    \
					 BTRFS_BLOCK_GROUP_SYSTEM |  \
					 BTRFS_BLOCK_GROUP_METADATA)

#define BTRFS_BLOCK_GROUP_PROFILE_MASK	(BTRFS_BLOCK_GROUP_RAID0 |   \
					 BTRFS_BLOCK_GROUP_RAID1 |   \
					 BTRFS_BLOCK_GROUP_RAID5 |   \
					 BTRFS_BLOCK_GROUP_RAID6 |   \
					 BTRFS_BLOCK_GROUP_DUP |     \
					 BTRFS_BLOCK_GROUP_RAID10)
#define BTRFS_BLOCK_GROUP_RAID56_MASK	(BTRFS_BLOCK_GROUP_RAID5 |   \
					 BTRFS_BLOCK_GROUP_RAID6)

#define BTRFS_BLOCK_GROUP_RAID1_MASK	(BTRFS_BLOCK_GROUP_RAID1)

/*
 * We need a bit for restriper to be able to tell when chunks of type
 * SINGLE are available.  This "extended" profile format is used in
 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
 * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
 * to avoid remappings between two formats in future.
 */
#define BTRFS_AVAIL_ALLOC_BIT_SINGLE	(1ULL << 48)

/*
 * A fake block group type that is used to communicate global block reserve
 * size to userspace via the SPACE_INFO ioctl.
 */
#define BTRFS_SPACE_INFO_GLOBAL_RSV	(1ULL << 49)

#define BTRFS_EXTENDED_PROFILE_MASK	(BTRFS_BLOCK_GROUP_PROFILE_MASK | \
					 BTRFS_AVAIL_ALLOC_BIT_SINGLE)

static __inline__ __u64 chunk_to_extended(__u64 flags)
{
	if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
		flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;

return flags;
}
static __inline__ __u64 extended_to_chunk(__u64 flags)
{
	return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
}

struct btrfs_block_group_item {
	__le64 used;
	__le64 chunk_objectid;
	__le64 flags;
} __attribute__ ((__packed__));

struct btrfs_free_space_info {
	__le32 extent_count;
	__le32 flags;
} __attribute__ ((__packed__));

#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)

#define BTRFS_QGROUP_LEVEL_SHIFT		48
static __inline__ __u64 btrfs_qgroup_level(__u64 qgroupid)
{
	return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
}

/*
 * is subvolume quota turned on?
 */
#define BTRFS_QGROUP_STATUS_FLAG_ON		(1ULL << 0)
/*
 * RESCAN is set during the initialization phase
 */
#define BTRFS_QGROUP_STATUS_FLAG_RESCAN		(1ULL << 1)
/*
 * Some qgroup entries are known to be out of date,
 * either because the configuration has changed in a way that
 * makes a rescan necessary, or because the fs has been mounted
 * with a non-qgroup-aware version.
 * Turning qouta off and on again makes it inconsistent, too.
 */
#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT	(1ULL << 2)

#define BTRFS_QGROUP_STATUS_VERSION        1

struct btrfs_qgroup_status_item {
	__le64 version;
	/*
	 * the generation is updated during every commit. As older
	 * versions of btrfs are not aware of qgroups, it will be
	 * possible to detect inconsistencies by checking the
	 * generation on mount time
	 */
	__le64 generation;

/* flag definitions see above */
	__le64 flags;

/*
	 * only used during scanning to record the progress
	 * of the scan. It contains a logical address
	 */
	__le64 rescan;
} __attribute__ ((__packed__));

struct btrfs_qgroup_info_item {
	__le64 generation;
	__le64 rfer;
	__le64 rfer_cmpr;
	__le64 excl;
	__le64 excl_cmpr;
} __attribute__ ((__packed__));

struct btrfs_qgroup_limit_item {
	/*
	 * only updated when any of the other values change
	 */
	__le64 flags;
	__le64 max_rfer;
	__le64 max_excl;
	__le64 rsv_rfer;
	__le64 rsv_excl;
} __attribute__ ((__packed__));

#endif /* _BTRFS_CTREE_H_ */

${this.title}

Code Editor : btrfs_tree.h