I have a 5G /usr btrfs filesystem on a 3.0.0-12-generic kernel that is returning ENOSPC when it's only 75% full:
Filesystem Size Used Avail Use% Mounted on /dev/mapper/rootvol-mint_usr 5.0G 2.8G 967M 75% /usr And yet I can't even unpack a linux-headers package on to it, which should be nowhere near 967MB. dpkg says it will need 10MB: $ sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: linux-headers-3.0.0-16-generic The following NEW packages will be installed: linux-headers-3.0.0-16-generic 0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded. 264 not fully installed or removed. Need to get 0 B/851 kB of archives. After this operation, 10.8 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 180246 files and directories currently installed.) Unpacking linux-headers-3.0.0-16-generic (from .../linux-headers-3.0.0-16-generic_3.0.0-16.28_i386.deb) ... dpkg: error processing /var/cache/apt/archives/linux-headers-3.0.0-16-generic_3.0.0-16.28_i386.deb (--unpack): unable to install new version of `/usr/src/linux-headers-3.0.0-16-generic/include/config/dvb/tuner/dib0070.h': No space left on device And indeed, using dd I am able to create a 967MB file: $ sudo dd if=/dev/zero of=/usr/bigfile bs=1M count=10000000 dd: writing `/usr/bigfile': No space left on device 967+0 records in 966+0 records out 1012924416 bytes (1.0 GB) copied, 16.1545 s, 62.7 MB/s strace yields this as the cause of the ENOSPC: 8213 rename("/usr/src/linux-headers-3.0.0-16-generic/include/config/dvb/tuner/dib0070.h.dpkg-new", "/usr/src/linux-headers-3.0.0-16-generic/include/config/dvb/tuner/dib0070.h" <unfinished ...> ... 8213 <... rename resumed> ) = -1 ENOSPC (No space left on device) So this starts to feel like some kind of inode count limitation. But I didn't think btrfs had inode count limitations. Here's the df stats on the filesystem: $ btrfs filesystem df /usr Data: total=3.22GB, used=3.22GB System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=896.00MB, used=251.62MB Metadata: total=8.00MB, used=0.00 I don't know if that's useful or not. Any ideas? Cheers b.
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