diff options
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/btrfs-man5.asciidoc | 36 |
1 files changed, 19 insertions, 17 deletions
diff --git a/Documentation/btrfs-man5.asciidoc b/Documentation/btrfs-man5.asciidoc index 0bc97dc5..88a386ed 100644 --- a/Documentation/btrfs-man5.asciidoc +++ b/Documentation/btrfs-man5.asciidoc @@ -452,35 +452,36 @@ means the feature can be enabled. List of features (see also `mkfs.btrfs`(8) section 'FILESYSTEM FEATURES'): -big_metadata:: +*big_metadata*:: (since: 3.4) + -the filesystem uses 'nodesize' bigger than the page size +the filesystem uses 'nodesize' for metadata blocks, this can be bigger than the +page size -compress_lzo:: +*compress_lzo*:: (since: 2.6.38) + the 'lzo' compression has been used on the filesystem, either as a mount option or via *btrfs filesystem defrag*. -default_subvol:: +*default_subvol*:: (since: 2.6.34) + the default subvolume has been set on the filesystem -extended_iref:: +*extended_iref*:: (since: 3.7) + increased hardlink limit per file in a directory to 65536, older kernels supported a varying number of hardlinks depending on the sum of all file name sizes that can be stored into one metadata block -mixed_backref:: +*mixed_backref*:: (since: 2.6.31) + -the last major disk format change, improved backreferences +the last major disk format change, improved backreferences, now default -mixed_groups:: +*mixed_groups*:: (since: 2.6.37) + mixed data and metadata block groups, ie. the data and metadata are not @@ -492,17 +493,18 @@ and vice versa) on the other hand, the final layout is quite unpredictable and possibly highly fragmented, which means worse performance -no_holes:: +*no_holes*:: (since: 3.14) ++ improved representation of file extents where holes are not explicitly stored as an extent, saves a few percent of metadata if sparse files are used -raid56:: +*raid56*:: (since: 3.9) + the filesystem contains or contained a raid56 profile of block groups -+ -skinny_metadata:: + +*skinny_metadata*:: (since: 3.10) + reduced-size metadata for extent references, saves a few percent of metadata @@ -578,16 +580,16 @@ filesystem module: for a given filesystem * get the supported features (can be also found under '/sys/fs/btrfs/features') - -The device is usually created by ..., but can be created manually: +The device is usually created by a system device node manager (eg. udev), but +can be created manually: -------------------- # mknod --mode=600 c 10 234 /dev/btrfs-control -------------------- -The device is not strictly required but the device scanning will not work and a -workaround would need to be used to mount a multi-device filesystem. The mount -option 'device' can trigger the device scanning during mount. +The control device is not strictly required but the device scanning will not +work and a workaround would need to be used to mount a multi-device filesystem. +The mount option 'device' can trigger the device scanning during mount. SEE ALSO -------- |