Comment # 19 on bug 1043912 from Frederic Crozat

(In reply to Nikolay Borisov from comment #18)
> I've built yet another kernel off latest 42.2, it can be found here:
> https://build.suse.de/project/show/home:nikbor:bsc1043912
> 
> 
> It contains a patch which rounds down the values used in the check and
> should hopefully allow Frederic to mount his system. If everything checks
> out I will commit it.

I can confirm kernel 4.4.73-1.g16a5f2a-default properly mounts my "problematic"
btrfs partition

However, I got the following warning (not sure if it is related):

[   54.116369] WARNING: CPU: 0 PID: 278 at ../fs/btrfs/ctree.h:1513
btrfs_update_device+0x1ad/0x1c0 [btrfs]()
[   54.116398]  ath9k_hw gpio_ich snd_hda_core snd_hwdep snd_pcm_oss iTCO_wdt
iTCO_vendor_support lrw gf128mul ath r8169 snd_pcm mac80211 joydev glue_helper
mii ablk_helper lpc_ich mfd_core snd_seq cfg80211 rfkill fjes snd_seq_device
snd_timer snd_mixer_oss processor i2c_i801 snd cryptd mei_me shpchp mei
soundcore pcspkr btrfs xor hid_microsoft hid_generic usbhid raid6_pq sr_mod
cdrom sd_mod crc32c_intel ahci libahci i915 libata video i2c_algo_bit xhci_pci
drm_kms_helper ehci_pci syscopyarea sysfillrect xhci_hcd sysimgblt ehci_hcd
fb_sys_fops usbcore drm usb_common button sg dm_multipath dm_mod scsi_dh_rdac
scsi_dh_emc scsi_dh_alua scsi_mod efivarfs autofs4
[   54.116438] Workqueue: events_unbound btrfs_async_reclaim_metadata_space
[btrfs]
[   54.116490]  [<ffffffffa04c66fd>] btrfs_update_device+0x1ad/0x1c0 [btrfs]
[   54.116512]  [<ffffffffa04cbf91>] btrfs_finish_chunk_alloc+0x151/0x590
[btrfs]
[   54.116521]  [<ffffffffa04875c7>]
btrfs_create_pending_block_groups+0x137/0x280 [btrfs]
[   54.116539]  [<ffffffffa049ff53>] __btrfs_end_transaction+0x93/0x350 [btrfs]
[   54.116548]  [<ffffffffa0488b6f>] flush_space+0xef/0x5f0 [btrfs]
[   54.116557]  [<ffffffffa048918b>]
btrfs_async_reclaim_metadata_space+0x11b/0x4b0 [btrfs]
[   54.117794] WARNING: CPU: 0 PID: 278 at ../fs/btrfs/ctree.h:1513
btrfs_update_device+0x1ad/0x1c0 [btrfs]()
[   54.117819]  gpio_ich snd_hda_core snd_hwdep snd_pcm_oss iTCO_wdt
iTCO_vendor_support lrw gf128mul ath r8169 snd_pcm mac80211 joydev glue_helper
mii ablk_helper lpc_ich mfd_core snd_seq cfg80211 rfkill fjes snd_seq_device
snd_timer snd_mixer_oss processor i2c_i801 snd cryptd mei_me shpchp mei
soundcore pcspkr btrfs xor hid_microsoft hid_generic usbhid raid6_pq sr_mod
cdrom sd_mod crc32c_intel ahci libahci i915 libata video i2c_algo_bit xhci_pci
drm_kms_helper ehci_pci syscopyarea sysfillrect xhci_hcd sysimgblt ehci_hcd
fb_sys_fops usbcore drm usb_common button sg dm_multipath dm_mod scsi_dh_rdac
scsi_dh_emc scsi_dh_alua scsi_mod efivarfs autofs4
[   54.117855] Workqueue: events_unbound btrfs_async_reclaim_metadata_space
[btrfs]
[   54.117884]  [<ffffffffa04c66fd>] btrfs_update_device+0x1ad/0x1c0 [btrfs]
[   54.117896]  [<ffffffffa04cbf91>] btrfs_finish_chunk_alloc+0x151/0x590
[btrfs]
[   54.117905]  [<ffffffffa04875c7>]
btrfs_create_pending_block_groups+0x137/0x280 [btrfs]
[   54.117915]  [<ffffffffa049ff53>] __btrfs_end_transaction+0x93/0x350 [btrfs]
[   54.117925]  [<ffffffffa0488b6f>] flush_space+0xef/0x5f0 [btrfs]
[   54.117933]  [<ffffffffa048918b>]
btrfs_async_reclaim_metadata_space+0x11b/0x4b0 [btrfs]