The fix worked perfectly, thanks. I am now able to: 1) create cache device on LVM & register it 2) create backing device on rbd & register it 3) use backing device without attaching the cache perfectly fine (format as ext4 + mount it and write some files) 4) attach the cache device to the backing device Unfortunately when trying to mount the backing device after attaching the cache I end up with a kernel BUG, the syslog output is below. [ 232.762594] bio: create slab <bio-1> at 1 [ 232.770175] bcache: btree_journal_read() done [ 232.778854] bcache: btree_check() done [ 232.778867] bcache: journal replay done, 1 keys in 1 entries, seq 3-3 [ 232.780579] bcache: registered cache device dm-1 [ 242.271440] libceph: client0 fsid 58c297c0-018a-4c13-9a21-0140b9fb2f25 [ 242.271973] libceph: mon1 10.10.20.1:6789 session established [ 242.277119] rbd0: unknown partition table [ 242.277236] rbd: rbd0: added with size 0x3e80000000 [ 251.360401] bcache: Caching rbd0, looked up UUID 12378985-91b3-4165-b3a6-6657831f050b [ 280.083396] EXT4-fs (bcache0): recovery complete [ 280.083403] EXT4-fs (bcache0): mounted filesystem with ordered data mode. Opts: (null) [ 283.160575] ------------[ cut here ]------------ [ 283.160609] kernel BUG at /home/dchurchill/Packages/oneiric/linux/linux-3.2.0~bcache/include/linux/scatterlist.h:63! [ 283.162338] invalid opcode: 0000 [#1] SMP [ 283.164064] CPU 0 [ 283.164076] Modules linked in: bnep rfcomm bluetooth ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables parport_pc ppdev kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_realtek eeepc_wmi asus_wmi sparse_keymap dm_multipath binfmt_misc bridge stp psmouse snd_hda_intel snd_hda_codec snd_hwdep snd_pcm serio_raw snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq radeon ttm snd_timer snd_seq_device mei(C) drm_kms_helper drm i2c_algo_bit video snd mac_hid soundcore snd_page_alloc wmi rbd libceph lp parport usbhid hid e1000e btrfs zlib_deflate firewire_ohci pata_marvell r8169 firewire_core crc_itu_t libcrc32c [ 283.175414] [ 283.177376] Pid: 4222, comm: ext4lazyinit Tainted: G C 3.2.0-9-generic #17~oneiric2 System manufacturer System Product Name/P8H67-M EVO [ 283.179432] RIP: 0010:[<ffffffff812f3588>] [<ffffffff812f3588>] blk_rq_map_sg+0x178/0x350 [ 283.181502] RSP: 0018:ffff8803f01f99d0 EFLAGS: 00010006 [ 283.183562] RAX: 0000000000000000 RBX: ffff8803f5019020 RCX: 4acfa4aaf8e1e9bf [ 283.185635] RDX: 0000000000000001 RSI: 00000000d6679dfb RDI: ffff8803f5019000 [ 283.187711] RBP: ffff8803f01f9a30 R08: 0000000000000000 R09: ffff8803eeb49e40 [ 283.189786] R10: 0000000000000001 R11: 0000000000000001 R12: ffff8803f561c800 [ 283.191858] R13: 000000008a430cfb R14: ffff8803f561c810 R15: 0000000000000082 [ 283.193941] FS: 0000000000000000(0000) GS:ffff88043f400000(0000) knlGS:0000000000000000 [ 283.196022] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 283.198100] CR2: 0000000001b1d278 CR3: 0000000001c05000 CR4: 00000000000406f0 [ 283.200191] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 283.202284] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 283.204382] Process ext4lazyinit (pid: 4222, threadinfo ffff8803f01f8000, task ffff8803f57a2e20) [ 283.206504] Stack: [ 283.208584] ffff880400000001 ffff8803f57bb870 ffff8803f5019000 0100000000000001 [ 283.210686] ffff8804213a3368 ffff8803eeb49e40 ffff8803f01f9a30 ffff8803f54f9158 [ 283.212778] ffff8803f57bb870 0000000000000001 0000000000000020 ffff880424e96800 [ 283.214833] Call Trace: [ 283.216848] [<ffffffff81442011>] scsi_init_sgtable+0x41/0x70 [ 283.218894] [<ffffffff8144207d>] scsi_init_io+0x3d/0x150 [ 283.220930] [<ffffffff8144228a>] scsi_setup_fs_cmnd.part.34+0x5a/0x90 [ 283.222942] [<ffffffff814422ef>] scsi_setup_fs_cmnd+0x2f/0x40 [ 283.224918] [<ffffffff8145f62f>] sd_prep_fn+0xaf/0xaf0 [ 283.226882] [<ffffffff813017f4>] ? cfq_dispatch_request+0x64/0xa0 [ 283.228835] [<ffffffff812eecda>] blk_peek_request+0xba/0x240 [ 283.230784] [<ffffffff814427e8>] scsi_request_fn+0x58/0x4c0 [ 283.232727] [<ffffffff812e7c73>] ? __elv_add_request+0x1b3/0x290 [ 283.234668] [<ffffffff812ef590>] blk_queue_bio+0x290/0x380 [ 283.236611] [<ffffffff812ec114>] generic_make_request.part.50+0x74/0xb0 [ 283.238570] [<ffffffff812ec528>] generic_make_request+0x68/0x70 [ 283.240517] [<ffffffff812ec5b5>] submit_bio+0x85/0x110 [ 283.242434] [<ffffffff811ac61a>] ? bio_alloc_bioset+0xba/0x100 [ 283.244332] [<ffffffff812f4900>] blkdev_issue_zeroout+0x110/0x170 [ 283.246223] [<ffffffff8121163b>] ext4_init_inode_table+0x15b/0x370 [ 283.248070] [<ffffffff8166ef75>] ? schedule_timeout+0x175/0x320 [ 283.249887] [<ffffffff81224c65>] ext4_run_li_request+0x85/0xe0 [ 283.251686] [<ffffffff81224d5c>] ext4_lazyinit_thread+0x9c/0x1c0 [ 283.253478] [<ffffffff81224cc0>] ? ext4_run_li_request+0xe0/0xe0 [ 283.255273] [<ffffffff8108832c>] kthread+0x8c/0xa0 [ 283.257048] [<ffffffff8167b034>] kernel_thread_helper+0x4/0x10 [ 283.258824] [<ffffffff810882a0>] ? flush_kthread_worker+0xa0/0xa0 On 24 January 2012 03:24, Kent Overstreet <kent.overstreet@xxxxxxxxx> wrote: > New code up, should be fixed. > > On Mon, Jan 23, 2012 at 4:33 AM, Damien Churchill <damoxc@xxxxxxxxx> wrote: >> Cool thanks, let me know when there's something to test and I'll let >> you know how it goes. >> >> On 23 January 2012 12:09, Kent Overstreet <koverstreet@xxxxxxxxxx> wrote: >>> So, we called a null function pointer. Looks like I broke the ioctl >>> handler somehow, I'll check that out tomorrow. >>> >>> On Mon, Jan 23, 2012 at 3:52 AM, Damien Churchill <damoxc@xxxxxxxxx> wrote: >>>> Excellent thanks a lot Kent, that's fixed the problem with the lv cache device. >>>> >>>> I am experiencing a problem attempting to use a rbd as a backing >>>> device also. This was working in 3.1 partially so I'm not sure what's >>>> changed there. The following is output to console & syslog whenever >>>> the bcache0 device is accessed by something. Well by blkid or >>>> mkfs.ext4. >>>> >>>> Jan 23 11:49:29 dev1 kernel: [ 280.993416] BUG: unable to handle >>>> kernel NULL pointer dereference at (null) >>>> Jan 23 11:49:29 dev1 kernel: [ 280.995317] IP: [< (null)>] >>>> (null) >>>> Jan 23 11:49:29 dev1 kernel: [ 280.997180] PGD 401b0d067 PUD 3fbfa1067 PMD 0 >>>> Jan 23 11:49:29 dev1 kernel: [ 280.999034] Oops: 0010 [#2] SMP >>>> Jan 23 11:49:29 dev1 kernel: [ 281.000831] CPU 2 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.000843] Modules linked in: bnep >>>> rfcomm bluetooth ip6table_filter ip6_tables ebtable_nat ebtables >>>> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 >>>> xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp >>>> iptable_filter ip_tables x_tables kvm_intel kvm parport_pc ppdev >>>> binfmt_misc usbhid hid snd_hda_codec_hdmi snd_hda_codec_realtek bridge >>>> stp snd_seq_midi psmouse eeepc_wmi radeon ttm drm_kms_helper asus_wmi >>>> snd_rawmidi drm sparse_keymap snd_seq_midi_event snd_hda_intel >>>> snd_hda_codec snd_hwdep snd_pcm snd_seq snd_timer snd_seq_device snd >>>> mac_hid video serio_raw soundcore dm_multipath wmi i2c_algo_bit >>>> snd_page_alloc mei(C) rbd libceph lp parport firewire_ohci >>>> firewire_core btrfs pata_marvell crc_itu_t e1000e r8169 zlib_deflate >>>> libcrc32c >>>> Jan 23 11:49:29 dev1 kernel: [ 281.012308] >>>> Jan 23 11:49:29 dev1 kernel: [ 281.014277] Pid: 4152, comm: blkid >>>> Tainted: G D C 3.2.0-9-generic #17~oneiric1 System >>>> manufacturer System Product Name/P8H67-M EVO >>>> Jan 23 11:49:29 dev1 kernel: [ 281.016330] RIP: >>>> 0010:[<0000000000000000>] [< (null)>] (null) >>>> Jan 23 11:49:29 dev1 kernel: [ 281.018364] RSP: 0018:ffff8803fbc3de60 >>>> EFLAGS: 00010282 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.020397] RAX: ffffffffa00763a0 RBX: >>>> 0000000000005331 RCX: 0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.022447] RDX: 0000000000005331 RSI: >>>> 000000000000101d RDI: ffff880423649380 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.024502] RBP: ffff8803fbc3de68 R08: >>>> 0000000000005331 R09: 000000000000101d >>>> Jan 23 11:49:29 dev1 kernel: [ 281.026563] R10: 00007fff9286b990 R11: >>>> 0000000000000246 R12: 00000000ffffffe7 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.028628] R13: 0000000000000000 R14: >>>> ffff8804236496c0 R15: ffff880420abd800 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.030698] FS: >>>> 00007f62be453760(0000) GS:ffff88043f500000(0000) >>>> knlGS:0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.032772] CS: 0010 DS: 0000 ES: >>>> 0000 CR0: 0000000080050033 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.034832] CR2: 0000000000000000 CR3: >>>> 00000003fa2da000 CR4: 00000000000406e0 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.036908] DR0: 0000000000000000 DR1: >>>> 0000000000000000 DR2: 0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.038972] DR3: 0000000000000000 DR6: >>>> 00000000ffff0ff0 DR7: 0000000000000400 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.041019] Process blkid (pid: 4152, >>>> threadinfo ffff8803fbc3c000, task ffff8803faa18000) >>>> Jan 23 11:49:29 dev1 kernel: [ 281.043083] Stack: >>>> Jan 23 11:49:29 dev1 kernel: [ 281.045138] ffffffff8141fa0f >>>> ffff8803fbc3dec8 ffffffff812f5110 0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.047243] ffff8804236496c0 >>>> 0000000000000000 000000004f1d4903 00000000329f0436 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.049312] 0000000000000003 >>>> ffff8804217ad3c0 ffff880404ae0a50 0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.051352] Call Trace: >>>> Jan 23 11:49:29 dev1 kernel: [ 281.053334] [<ffffffff8141fa0f>] ? >>>> ioctl_dev+0x2f/0x40 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.055284] [<ffffffff812f5110>] >>>> blkdev_ioctl+0x2e0/0x740 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.057191] [<ffffffff811acf10>] >>>> block_ioctl+0x40/0x50 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.059056] [<ffffffff8118843a>] >>>> do_vfs_ioctl+0x8a/0x340 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.060888] [<ffffffff8117b2ea>] ? >>>> sys_newfstat+0x2a/0x40 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.062687] [<ffffffff81188781>] >>>> sys_ioctl+0x91/0xa0 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.064478] [<ffffffff81678ec2>] >>>> system_call_fastpath+0x16/0x1b >>>> Jan 23 11:49:29 dev1 kernel: [ 281.066259] Code: Bad RIP value. >>>> Jan 23 11:49:29 dev1 kernel: [ 281.068035] RIP [< (null)>] >>>> (null) >>>> Jan 23 11:49:29 dev1 kernel: [ 281.069812] RSP <ffff8803fbc3de60> >>>> Jan 23 11:49:29 dev1 kernel: [ 281.071573] CR2: 0000000000000000 >>>> Jan 23 11:49:29 dev1 kernel: [ 281.073342] ---[ end trace 644c98d7f838705d ]--- >>>> >>>> >>>> On 21 January 2012 08:15, Kent Overstreet <koverstreet@xxxxxxxxxx> wrote: >>>>> just tracked down a bug I was seeing when I was testing bcache on arm. >>>>> >>>>> Turns out whoever wrote bio_get_nr_vecs() never heard of integer overflow. >>>>> >>>>> But I bet it's the same bug you were seeing, and there's a trivial >>>>> workaround in bcache. >>>>> >>>>> Patch will be up momentarily. >>>>> >>>>> On Fri, Jan 20, 2012 at 6:43 PM, Kent Overstreet >>>>> <kent.overstreet@xxxxxxxxx> wrote: >>>>>> Have you tried the bcache (3.1 based) branch with the same setup? Did >>>>>> it occur there? >>>>>> >>>>>> On Fri, Jan 20, 2012 at 3:27 AM, Damien Churchill <damoxc@xxxxxxxxx> wrote: >>>>>>> Hi there, >>>>>>> >>>>>>> I'm receiving the following after attempting to register a cache >>>>>>> device, I've built the kernel using the Ubuntu Precise kernel with a >>>>>>> patch from bcache-3.2-dev applied to the tree. >>>>>>> >>>>>>> The cache device was created by running: >>>>>>> $ make-bcache -C -w 2k -b 1M /dev/sysvg/bcache-test >>>>>>> >>>>>>> The cache device is a logical volume, I'm unsure if that will have an impact? >>>>>>> >>>>>>> Regards, >>>>>>> Damien >>>>>>> >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.025724] bio: create slab <bio-1> at 1 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.025902] bcache: invalidating existing data >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026324] ------------[ cut here ]------------ >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026341] kernel BUG at >>>>>>> /home/dchurchill/Packages/oneiric/linux/linux-3.2.0~bcache/include/linux/scatterlist.h:63! >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026367] invalid opcode: 0000 [#1] SMP >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026380] CPU 0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026385] Modules linked in: rfcomm >>>>>>> bnep bluetooth ip6table_filter ip6_tables ebtable_nat ebtables >>>>>>> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 >>>>>>> xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp >>>>>>> iptable_filter ip_tables x_tables kvm_intel kvm parport_pc ppdev >>>>>>> snd_hda_codec_hdmi snd_hda_codec_realtek binfmt_misc bridge usbhid hid >>>>>>> psmouse snd_hda_intel stp snd_hda_codec snd_hwdep snd_pcm snd_seq_midi >>>>>>> eeepc_wmi asus_wmi sparse_keymap radeon ttm drm_kms_helper drm wmi >>>>>>> mac_hid serio_raw video snd_rawmidi snd_seq_midi_event mei(C) snd_seq >>>>>>> snd_timer snd_seq_device snd i2c_algo_bit soundcore dm_multipath >>>>>>> snd_page_alloc rbd libceph lp parport firewire_ohci firewire_core >>>>>>> crc_itu_t e1000e pata_marvell r8169 btrfs zlib_deflate libcrc32c >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026612] >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026617] Pid: 2420, comm: bash >>>>>>> Tainted: G C 3.2.0-9-generic #17~oneiric1 System >>>>>>> manufacturer System Product Name/P8H67-M EVO >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.026649] RIP: >>>>>>> 0010:[<ffffffff812f3588>] [<ffffffff812f3588>] >>>>>>> blk_rq_map_sg+0x178/0x350 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.027607] RSP: 0018:ffff880420fbf7c8 >>>>>>> EFLAGS: 00010002 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.028564] RAX: 0000000000000000 RBX: >>>>>>> ffff8803fa608a20 RCX: 2700013524000135 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.029529] RDX: 0000000000000011 RSI: >>>>>>> 0000000027000135 RDI: ffff8803fa608a00 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.030492] RBP: ffff880420fbf828 R08: >>>>>>> 0000000000001000 R09: ffff880421862f00 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.031455] R10: 0000000000000001 R11: >>>>>>> 0000000000000001 R12: ffff8803fa60a510 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.032417] R13: 0000000027000135 R14: >>>>>>> ffff8803fa60a520 R15: 00000000000000d3 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.033385] FS: >>>>>>> 00007f5259391720(0000) GS:ffff88043f400000(0000) >>>>>>> knlGS:0000000000000000 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.034361] CS: 0010 DS: 0000 ES: >>>>>>> 0000 CR0: 000000008005003b >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.035336] CR2: 00007f6d332e8000 CR3: >>>>>>> 0000000401c16000 CR4: 00000000000406f0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.036310] DR0: 0000000000000000 DR1: >>>>>>> 0000000000000000 DR2: 0000000000000000 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.037287] DR3: 0000000000000000 DR6: >>>>>>> 00000000ffff0ff0 DR7: 0000000000000400 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.038266] Process bash (pid: 2420, >>>>>>> threadinfo ffff880420fbe000, task ffff880403b3dc40) >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.039252] Stack: >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.040220] 0000000000000011 >>>>>>> ffff880400fcd2b0 ffff8803fa608800 0100000000000001 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.041196] ffff8804213a3368 >>>>>>> ffff880421862f00 ffff880420fbf828 ffff8804209cb858 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.042171] ffff880400fcd2b0 >>>>>>> 0000000000000001 0000000000000020 ffff880424e96800 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.043130] Call Trace: >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.044070] [<ffffffff81442521>] >>>>>>> scsi_init_sgtable+0x41/0x70 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.045036] [<ffffffff8144258d>] >>>>>>> scsi_init_io+0x3d/0x150 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.045983] [<ffffffff8144279a>] >>>>>>> scsi_setup_fs_cmnd.part.34+0x5a/0x90 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.046917] [<ffffffff814427ff>] >>>>>>> scsi_setup_fs_cmnd+0x2f/0x40 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.047837] [<ffffffff8145fb3f>] >>>>>>> sd_prep_fn+0xaf/0xaf0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.048747] [<ffffffff813017f4>] ? >>>>>>> cfq_dispatch_request+0x64/0xa0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.049654] [<ffffffff812eecda>] >>>>>>> blk_peek_request+0xba/0x240 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.050558] [<ffffffff81442cf8>] >>>>>>> scsi_request_fn+0x58/0x4c0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.051461] [<ffffffff812e7c73>] ? >>>>>>> __elv_add_request+0x1b3/0x290 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.052361] [<ffffffff812ef590>] >>>>>>> blk_queue_bio+0x290/0x380 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.053262] [<ffffffff812ec114>] >>>>>>> generic_make_request.part.50+0x74/0xb0 >>>>>>> Jan 20 11:24:36 dev1 kernel: [ 119.054170] [<ffffffff812ec528>] >>>>>>> generic_make_request+0x68/0x70 >>>>>>> -- >>>>>>> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in >>>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>>>>> -- >>>>>> To unsubscribe from this list: send the line "unsubscribe linux-bcache" in >>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
