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)