diff options
Diffstat (limited to 'Documentation/btrfs-filesystem.asciidoc')
| -rw-r--r-- | Documentation/btrfs-filesystem.asciidoc | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/btrfs-filesystem.asciidoc b/Documentation/btrfs-filesystem.asciidoc index 31cd51be..600bbac0 100644 --- a/Documentation/btrfs-filesystem.asciidoc +++ b/Documentation/btrfs-filesystem.asciidoc @@ -55,6 +55,13 @@ if the free space is too fragmented. Use 0 to take the kernel default, which is 256kB but may change in the future. You can also turn on compression in defragment operations. + +WARNING: Defragmenting with Linux kernel versions < 3.9 or ≥ 3.14-rc2 as well as +with Linux stable kernel versions ≥ 3.10.31, ≥ 3.12.12 or ≥ 3.13.4 will break up +the ref-links of CoW data (for example files copied with `cp --reflink`, +snapshots or de-duplicated data). +This may cause considerable increase of space usage depending on the broken up +ref-links. ++ `Options` + -v:::: @@ -79,10 +86,6 @@ target extent size, do not touch extents bigger than <size> For <start>, <len>, <size> it is possible to append units designator: \'K', \'M', \'G', \'T', \'P', or \'E', which represent KiB, MiB, GiB, TiB, PiB, or EiB, respectively. Case does not matter. -+ -WARNING: defragmenting with kernels up to 2.6.37 will unlink COW-ed copies of data, -don't use it if you use snapshots, have de-duplicated your data or made -copies with `cp --reflink`. *label* [<dev>|<mountpoint>] [<newlabel>]:: Show or update the label of a filesystem. |