Hi,

I tried to mount an ext4 filesystem on OpenBSD which was created on
CentOS7. I get this:

remi@mistral:~% doas mount -t ext2fs /dev/sd0m /mnt
mount_ext2fs: /dev/sd0m on /mnt: specified device does not match mounted device
remi@mistral:~%  dmesg | grep incomp
ext2fs: unsupported incompat features 0x2c2
remi@mistral:~%

Which feature is 0x2c2? Maybe I can disable this or re-create the filesystem
on Linux without this feature?

Thanks,
Remi

tune2fs (on OpenBSD):

tune2fs 1.42.12 (29-Aug-2014)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          c2b2aefb-2cc0-4cec-8346-26e35c26a7b9
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype 
extent 64bit flex_bg sparse_super large_file huge_file uninit_bg dir_nlink 
extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              3768320
Block count:              15062272
Reserved block count:     753113
Free blocks:              12427964
Free inodes:              3611179
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Sat Jan  2 10:15:09 2016
Last mount time:          Tue Jan  5 07:12:45 2016
Last write time:          Tue Jan  5 08:12:44 2016
Mount count:              12
Maximum mount count:      -1
Last checked:             Sat Jan  2 10:15:09 2016
Check interval:           0 (<none>)
Lifetime writes:          12 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group wheel)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      2ae71fa4-8b6c-4770-bdde-210a6a596f9b
Journal backup:           inode blocks


disklabel:

# /dev/rsd0c:
type: SCSI
disk: SCSI disk
label: LITEON L8H-256V2
duid: 5871eb4bf4f4b2bc
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 31130
total sectors: 500118192
boundstart: 84934722
boundend: 378536002
drivedata: 0 

16 partitions:
#                size           offset  fstype [fsize bsize  cpg]
  a:        293601280         84934722    RAID                   
  c:        500118192                0  unused                   
  i:          1048576               64   MSDOS                   
  j:         83886080          1048641    NTFS                   
  k:            32768        378537984 unknown                   
  l:          1048576        378570752  ext2fs                   
  m:        120498176        379619328  ext2fs                   


dmesg:

OpenBSD 5.9-beta (GENERIC.MP) #23: Mon Dec 28 12:03:11 CET 2015
    r...@mistral.relo.ch:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8473636864 (8081MB)
avail mem = 8212668416 (7832MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xed7d0 (84 entries)
bios0: vendor Dell Inc. version "A07" date 11/11/2015
bios0: Dell Inc. XPS 13 9343
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT FIDT MCFG HPET SSDT UEFI SSDT ASF! SSDT SSDT 
SSDT SSDT PCCT SSDT SSDT SSDT SLIC MSDM DMAR CSRT BGRT
acpi0: wakeup devices PEGP(S4) PEG0(S4) PEGP(S4) PEG1(S4) PEGP(S4) PEG2(S4) 
PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) 
PXSX(S4) RP05(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.65 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.24 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 1 (application processor)
cpu2: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.24 MHz
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 1, core 0, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz, 2494.24 MHz
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SENSOR,ARAT
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 1, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
acpimadt0: bogus nmi for apid 0
acpimadt0: bogus nmi for apid 2
acpimadt0: bogus nmi for apid 1
acpimadt0: bogus nmi for apid 3
acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PEG0)
acpiprt2 at acpi0: bus -1 (PEG1)
acpiprt3 at acpi0: bus -1 (PEG2)
acpiprt4 at acpi0: bus 1 (RP01)
acpiprt5 at acpi0: bus -1 (RP02)
acpiprt6 at acpi0: bus -1 (RP03)
acpiprt7 at acpi0: bus 2 (RP04)
acpiprt8 at acpi0: bus -1 (RP05)
acpiprt9 at acpi0: bus -1 (RP06)
acpiprt10 at acpi0: bus -1 (RP07)
acpiprt11 at acpi0: bus -1 (RP08)
acpiec0 at acpi0
acpicpu0 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C3(200@506 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: PG00, resource for PEG0
acpipwrres1 at acpi0: PG01, resource for PEG1
acpipwrres2 at acpi0: PG02, resource for PEG2
acpitz0 at acpi0: critical temperature is 107 degC
acpipwrres3 at acpi0: FN00, resource for FAN0
acpipwrres4 at acpi0: FN01, resource for FAN1
acpipwrres5 at acpi0: FN02, resource for FAN2
acpipwrres6 at acpi0: FN03, resource for FAN3
acpipwrres7 at acpi0: FN04, resource for FAN4
acpitz1 at acpi0: critical temperature is 105 degC
acpitz2 at acpi0: critical temperature is 105 degC
acpibtn0 at acpi0: LID0
acpibtn1 at acpi0: PBTN
acpibtn2 at acpi0: SBTN
acpiac0 at acpi0: AC unit offline
acpibat0 at acpi0: BAT0 model "DELL 0DRRP56" serial 154 type LiP oem "Sanyo"
acpibat1 at acpi0: BAT1 not present
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: LCD_
cpu0: Enhanced SpeedStep 2494 MHz: speeds: 2201, 2200, 2100, 2000, 1800, 1700, 
1600, 1500, 1300, 1200, 1100, 1000, 900, 700, 600, 500 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 5500" rev 0x09
drm0 at inteldrm0
inteldrm0: msi
inteldrm0: 1920x1080
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi
vendor "Intel", unknown product 0x1603 (class DASP subclass miscellaneous, rev 
0x09) at pci0 dev 4 function 0 not configured
xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
"Intel 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured
ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3: msi
pci1 at ppb0 bus 1
rtsx0 at pci1 dev 0 function 0 "Realtek RTS5249 Card Reader" rev 0x01: msi
sdmmc0 at rtsx0
ppb1 at pci0 dev 28 function 3 "Intel 9 Series PCIE" rev 0xe3: msi
pci2 at ppb1 bus 2
iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7265" rev 0x59, msi
pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03
ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x03: msi, AHCI 1.3
ahci0: port 3: 6.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 3 lun 0: <ATA, LITEON L8H-256V2, F881> SCSI3 0/direct 
fixed t10.ATA_LITEON_L8H-256V2G-11_M.2_2280_256GB_TW0MGNHV5508556A4111
sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 18
iic0 at ichiic0
"Intel 9 Series Thermal" rev 0x03 at pci0 dev 31 function 6 not configured
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pms0: Synaptics clickpad, firmware 8.1
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
uvideo0 at uhub0 port 5 configuration 1 interface 0 "CKFEH41F301030003940 
Integrated_Webcam_HD" rev 2.01/48.14 addr 2
video0 at uvideo0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 005> SCSI2 0/direct fixed
sd1: 143359MB, 512 bytes/sector, 293600752 sectors
root on sd1a (ff74af09a40c98e0.a) swap on sd1b dump on sd1b
iwm0: hw rev 0x210, fw ver 25.228 (API ver 9), address 5c:e0:c5:1f:ad:c4
ext2fs: unsupported incompat features 0x2c2
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 3)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)
pms0: not in sync yet, discard input (state 0)

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