diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/mkfs.btrfs.asciidoc | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/Documentation/mkfs.btrfs.asciidoc b/Documentation/mkfs.btrfs.asciidoc index a9aa3cb4..5789762a 100644 --- a/Documentation/mkfs.btrfs.asciidoc +++ b/Documentation/mkfs.btrfs.asciidoc @@ -133,9 +133,42 @@ UNIT As default the unit is the byte, however it is possible to append a suffix to the arguments like 'k' for KBytes, 'm' for MBytes... +NOTES +----- +Since mixed block group creation is optional, we allow small +filesystem instances with differing values for sectorsize and nodesize +to be created and could end up in the following situation, + + [root@localhost ~]# mkfs.btrfs -f -n 65536 /dev/loop0 + btrfs-progs v3.19-rc2-405-g976307c + See http://btrfs.wiki.kernel.org for more information. + + Performing full device TRIM (512.00MiB) ... + Label: (null) + UUID: 49fab72e-0c8b-466b-a3ca-d1bfe56475f0 + Node size: 65536 + Sector size: 4096 + Filesystem size: 512.00MiB + Block group profiles: + Data: single 8.00MiB + Metadata: DUP 40.00MiB + System: DUP 12.00MiB + SSD detected: no + Incompat features: extref, skinny-metadata + Number of devices: 1 + Devices: + ID SIZE PATH + 1 512.00MiB /dev/loop0 + [root@localhost ~]# mount /dev/loop0 /mnt/ + mount: mount /dev/loop0 on /mnt failed: No space left on device + +The ENOSPC occurs during the creation of the UUID tree. This is +because of things like large metadata block size, DUP mode used for +metadata and global reservation consuming space. + AVAILABILITY ------------ -*btrfs* is part of btrfs-progs. +*mkfs.btrfs* is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details. |