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Diffstat (limited to 'Documentation/btrfs-mount.asciidoc')
| -rw-r--r-- | Documentation/btrfs-mount.asciidoc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/btrfs-mount.asciidoc b/Documentation/btrfs-mount.asciidoc index 39215a8e..d364594f 100644 --- a/Documentation/btrfs-mount.asciidoc +++ b/Documentation/btrfs-mount.asciidoc @@ -26,6 +26,13 @@ MOUNT OPTIONS Auto defragmentation detects small random writes into files and queue them up for the defrag process. Works best for small files; Not well suited for large database workloads. + + + 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. *check_int*:: *check_int_data*:: |