Quoting Tsutomu Itoh (2013-04-02 21:19:06)
> Hi,
> 
> When inode_cache was specified for the mount option, I encountered the
> following messages at umount.
> 
> Step to reproduce:
> 
>  mkfs.btrfs -f /dev/sdc4
>  mount -o compress=lzo,autodefrag,inode_cache /dev/sdc4 /test1
>  dd if=/dev/zero of=/test1/file1 bs=1M count=8192
>  dd if=/test1/file1 of=/dev/null bs=1M
>  rm -f /test1/file1
>  umount /test1
> Apr  3 09:43:12 luna kernel: [  554.639149] BTRFS error (device sdc4) in 
> btrfs_save_ino_cache:471: error 28

We're running out of space while saving the inode cache.  Strictly
speaking this should not abort the FS.  I'll take a look.

-chris
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