On Mon, 27 Jun 2011 01:00:18 +0600 Roman Mamedov <rm@xxxxxxxxxx> wrote: > I am having some trouble with btrfs on the MIPS (Little Endian) architecture. > > Linux hoshi 2.6.39-libre-lemote-rm1 #1 Sun May 29 17:48:16 YEKST 2011 mips64 GNU/Linux > > btrfs-tools 0.19+20101101-1 > > First of all, the kernel I use has a 16K page size; the only other option here is 64K, but that > one is experimental (and 4K pages can't be used). So my mkfs.btrfs looked like this: > ---------------------------------------- > # mkfs.btrfs /dev/sdb2 > > WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL > WARNING! - see http://btrfs.wiki.kernel.org before using > > fs created label (null) on /dev/sdb2 > nodesize 16384 leafsize 16384 sectorsize 16384 size 55.79GB > Btrfs Btrfs v0.19 > ---------------------------------------- > Then when mounting this newly-created FS I am getting this output in dmesg (but the FS seems to > mount fine after that): > > [18483.211686] device fsid 4f4166647bc24d39-853307fabbe34bb0 devid 1 transid 10 /dev/sdb2 > [18483.216001] ------------[ cut here ]------------ > [18483.216301] WARNING: at fs/btrfs/extent_io.c:3824 write_extent_buffer+0x1b8/0x270 [btrfs]() > [18483.216541] Modules linked in: btrfs zlib_deflate crc32c libcrc32c udf crc_itu_t netconsole > configfs usb_storage uas tun ipv6 option usb_wwan usbserial snd_cs5535audio snd_ac97_codec > ohci_hcd ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm ehci_hcd usbcore snd_timer snd > loongson2_cpufreq nls_base soundcore r8169 snd_page_alloc > [18483.217771] Call Trace: > [18483.217898] [<ffffffff8076b5e8>] dump_stack+0x8/0x40 > [18483.218072] [<ffffffff8023dbc0>] warn_slowpath_common+0x78/0x160 > [18483.218319] [<ffffffffc0576cd0>] write_extent_buffer+0x1b8/0x270 [btrfs] > [18483.218606] [<ffffffffc058c258>] btrfs_read_sys_array+0xa8/0x220 [btrfs] > [18483.218895] [<ffffffffc0540948>] open_ctree+0x1000/0x1c68 [btrfs] > [18483.219152] [<ffffffffc0506db8>] btrfs_mount+0x5a0/0x7d8 [btrfs] > [18483.219372] [<ffffffff80343628>] mount_fs+0x58/0x1b8 > [18483.219541] [<ffffffff80365c9c>] do_kern_mount+0x74/0x178 > [18483.219716] [<ffffffff80367e98>] do_mount+0x690/0xac8 > [18483.219895] [<ffffffff8039c2e4>] compat_sys_mount+0x94/0x268 > [18483.220081] [<ffffffff802191f8>] handle_sys+0x158/0x178 > [18483.220248] > [18483.220346] ---[ end trace 73234e8ad8eaf7bf ]--- > > My questions are, > - What's up with the warning in dmesg? > - Can this filesystem (nodesize 16384 leafsize 16384 sectorsize 16384) be mounted on an > x86 system with page size of 4K at all, if I move the disk there (didn't try that yet)? > - If not, isn't that suboptimal to have mkfs in some circumstances create a > non-cross-architecture FS by default? > - Can I force it make one by specifying -l 4096 -n 4096 -s 4096, > - ...and then will I have no problems using such FS both on 16K and 4K-paged machines? Forcing does not work: ---- root@hoshi:~# mkfs.btrfs -n 4096 -l 4096 -s 4096 /dev/etherd/e9.8 Illegal leafsize 4096 root@hoshi:~# mkfs.btrfs -n 4096 -s 4096 /dev/etherd/e9.8 Illegal nodesize 4096 ---- Only setting sector size supposedly passes OK, but the result is still sector size 16384: ---- root@hoshi:~# mkfs.btrfs -s 4096 /dev/etherd/e9.8 WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using fs created label (null) on /dev/etherd/e9.8 nodesize 16384 leafsize 16384 sectorsize 16384 size 29.80GB Btrfs Btrfs v0.19 ---- Also the issue still happens with kernel 3.0.0. ---- [ 519.579806] Btrfs loaded [ 519.581140] device fsid a6200e33-9982-4002-849d-6df984154e5b devid 1 transid 7 /dev/etherd/e9.8 [ 519.585434] ------------[ cut here ]------------ [ 519.586063] WARNING: at fs/btrfs/extent_io.c:3630 write_extent_buffer+0x1b8/0x270 [btrfs]() [ 519.586627] Modules linked in: btrfs zlib_deflate crc32c libcrc32c aoe fuse ipv6 usb_storage uas ohci_hcd snd_cs5535audio snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm ehci_hcd loongson2_cpufreq snd_timer snd usbcore soundcore snd_page_alloc nls_base r8169 [ 519.588700] Call Trace: [ 519.588964] [<ffffffff80774e14>] dump_stack+0x8/0x40 [ 519.589360] [<ffffffff8023d7a0>] warn_slowpath_common+0x78/0x160 [ 519.589857] [<ffffffffc03dbf00>] write_extent_buffer+0x1b8/0x270 [btrfs] [ 519.590411] [<ffffffffc03f0a90>] btrfs_read_sys_array+0xa8/0x218 [btrfs] [ 519.590955] [<ffffffffc03a5510>] open_ctree+0x1200/0x1e50 [btrfs] [ 519.591496] [<ffffffffc036ae68>] btrfs_mount+0x5a8/0x7e0 [btrfs] [ 519.591970] [<ffffffff80348c48>] mount_fs+0x58/0x1b8 [ 519.592358] [<ffffffff8036b08c>] do_kern_mount+0x74/0x178 [ 519.592758] [<ffffffff8036cd3c>] do_mount+0x694/0xad0 [ 519.593147] [<ffffffff803a17fc>] compat_sys_mount+0x94/0x268 [ 519.593575] [<ffffffff80219018>] handle_sys+0x158/0x178 [ 519.593957] [ 519.594143] ---[ end trace 7792b9225987a9a5 ]--- ---- -- With respect, Roman
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