On Wed, Jun 17, 2015 at 8:46 PM, Marc MERLIN <m...@merlins.org> wrote: > On Fri, Jun 12, 2015 at 03:19:06PM +0300, Robert Munteanu wrote: >> Hi, > > Note to others: kernel 4.0.4 > > Reply to you: > I tried ext4 to btrfs once a year ago and it severely mangled my > filesystem. > I looked at it as a cool feature/hack that may have worked some time ago, but > that no one really uses anymore, and that may not work right at this > point. > > Unless you hear back from a developer interested in debugging/fixing > this, I would assume that this feature is broken and dead.
I did hear, but in case the general consensus is that this feature is broken/experimental/unsafe, it would be great to mention it in the wiki page. Thanks, Robert > > Marc > >> I have converted my root ext4 partition to btrfs. I used an USB stick >> to boot and used btrfs-convert. >> >> I also did a balance and defrag ( in that order ) , both when the fs >> was mounted. >> >> After logging in to KDE I quickly get a read-only filesystem. I've >> pasted the backtrace below >> >> Jun 11 23:13:08 mars kernel: WARNING: CPU: 2 PID: 2777 at >> ../fs/btrfs/super.c:260 __btrfs_abort_transaction+0x4b/0x120 [btrfs]() >> Jun 11 23:13:08 mars kernel: BTRFS: Transaction aborted (error -95) >> Jun 11 23:13:08 mars kernel: Modules linked in: bnep bluetooth rfkill >> fuse vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) af_packet >> nf_log_ipv6 xt_pkttype nf_log_ip >> v4 nf_log_common xt_LOG xt_limit ip6t_REJECT xt_tcpudp >> nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw >> xt_CT iptable_filter ip6table_mangle nf_con >> ntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 >> nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter >> ip6_tables x_tables xfs libcrc32c snd_hda >> _codec_hdmi raid1 md_mod gpio_ich ppdev iTCO_wdt iTCO_vendor_support >> coretemp snd_hda_codec_realtek snd_hda_codec_generic kvm_intel >> snd_hda_intel dm_mod kvm snd_hda_co >> ntroller snd_hda_codec snd_hwdep serio_raw pcspkr snd_pcm i2c_i801 >> snd_seq joydev snd_seq_device snd_timer snd 8250_fintek parport_pc >> parport acpi_cpufreq lpc_ich >> Jun 11 23:13:08 mars kernel: soundcore mfd_core shpchp processor >> ata_generic btrfs hid_logitech_hidpp xor raid6_pq sr_mod cdrom >> nvidia_uvm(PO) nvidia(PO) firewire_ohc >> i firewire_core crc_itu_t uas usb_storage r8169 mii pata_jmicron >> hid_logitech_dj drm button sg >> Jun 11 23:13:08 mars kernel: CPU: 2 PID: 2777 Comm: kworker/u8:0 >> Tainted: P O 4.0.4-3-desktop #1 >> Jun 11 23:13:08 mars kernel: Hardware name: Gigabyte Technology Co., >> Ltd. EP35-DS4/EP35-DS4, BIOS F6d 01/08/2009 >> Jun 11 23:13:08 mars kernel: Workqueue: btrfs-endio-write >> btrfs_endio_write_helper [btrfs] >> Jun 11 23:13:08 mars kernel: 0000000000000000 ffffffffa0a92832 >> ffffffff8167c4aa ffff880128513ca8 >> Jun 11 23:13:08 mars kernel: ffffffff81063bb1 ffff880031929d28 >> ffff880221e71800 00000000ffffffa1 >> Jun 11 23:13:08 mars kernel: ffffffffa0a914e0 0000000000000b50 >> ffffffff81063c2a ffffffffa0a95928 >> Jun 11 23:13:08 mars kernel: Call Trace: >> Jun 11 23:13:08 mars kernel: [<ffffffff8100574c>] dump_trace+0x8c/0x340 >> Jun 11 23:13:08 mars kernel: [<ffffffff81005aa3>] >> show_stack_log_lvl+0xa3/0x190 >> Jun 11 23:13:08 mars kernel: [<ffffffff81007201>] show_stack+0x21/0x50 >> Jun 11 23:13:08 mars kernel: [<ffffffff8167c4aa>] dump_stack+0x47/0x67 >> Jun 11 23:13:08 mars kernel: [<ffffffff81063bb1>] >> warn_slowpath_common+0x81/0xb0 >> Jun 11 23:13:08 mars kernel: [<ffffffff81063c2a>] >> warn_slowpath_fmt+0x4a/0x50 >> Jun 11 23:13:08 mars kernel: [<ffffffffa09e598b>] >> __btrfs_abort_transaction+0x4b/0x120 [btrfs] >> Jun 11 23:13:08 mars kernel: [<ffffffffa0a1d18a>] >> btrfs_finish_ordered_io+0x5aa/0x620 [btrfs] >> Jun 11 23:13:08 mars kernel: [<ffffffffa0a43253>] >> normal_work_helper+0xc3/0x320 [btrfs] >> Jun 11 23:13:08 mars kernel: [<ffffffff8107bcf2>] >> process_one_work+0x142/0x420 >> Jun 11 23:13:08 mars kernel: [<ffffffff8107c0e4>] worker_thread+0x114/0x460 >> Jun 11 23:13:08 mars kernel: [<ffffffff81081261>] kthread+0xc1/0xe0 >> Jun 11 23:13:08 mars kernel: [<ffffffff81682d58>] ret_from_fork+0x58/0x90 >> Jun 11 23:13:08 mars kernel: ---[ end trace 4c4eb7d6e98afa91 ]--- >> Jun 11 23:13:08 mars kernel: BTRFS: error (device sda1) in >> btrfs_finish_ordered_io:2896: errno=-95 unknown >> Jun 11 23:13:08 mars kernel: BTRFS info (device sda1): forced readonly >> >> Some diagnostic info: >> >> - btrfs scrub reports no errors >> - on the host machine I'm running btrfs v4.0+20150429 and kernel >> 4.0.4-3-desktop >> - on the live medium, used to run btrfs-convert, I was running btrfs >> v4.0+20150429 and kernel 4.0.3-1-default >> >> # btrfs fi show >> Label: none uuid: 54dea125-74cd-4bb2-86a2-f7bc645b76cf >> Total devices 1 FS bytes used 90.22GiB >> devid 1 size 223.57GiB used 92.03GiB path /dev/sda1 >> >> btrfs-progs v4.0+20150429 >> >> # btrfs fi df / >> Data, single: total=89.00GiB, used=88.17GiB >> System, single: total=32.00MiB, used=16.00KiB >> Metadata, single: total=3.00GiB, used=2.05GiB >> GlobalReserve, single: total=512.00MiB, used=0.00B >> >> Is there a way out? I still have the old ext4 image and can revert, >> but I'm keeping the btrfs one for now, in case I can extract some >> useful debugging information from it. >> >> Thanks, >> >> Robert >> >> >> -- >> http://robert.muntea.nu/ >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- > "A mouse is a device used to point at the xterm you want to type in" - A.S.R. > Microsoft is to operating systems .... > .... what McDonalds is to gourmet > cooking > Home page: http://marc.merlins.org/ | PGP > 1024R/763BE901 -- http://robert.muntea.nu/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
