Add reference to BTRFS_SKIP_LVM_SNAPSHOT environment viarble in
the btrfs(8) documentation.

Signed-off-by: Goffredo Baroncelli <kreij...@inwind.it>
---
 Documentation/btrfs.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/btrfs.txt b/Documentation/btrfs.txt
index 3bdc6b4..889b97c 100644
--- a/Documentation/btrfs.txt
+++ b/Documentation/btrfs.txt
@@ -96,6 +96,14 @@ AVAILABILITY
 Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
 further details.
 
+ENVIRONMENT VARIABLES
+---------------------
+BTRFS_SKIP_LVM_SNAPSHOT::
+       Controls if the *lvm snapshots* have to be
+       ignored. Default "yes"; if you need to consider them, set it to "no".
+       Pay attention that *btrfs* may be confused if two devices have
+       the same dev uuid. This is the reason to skip a lvm snapshot.
+
 SEE ALSO
 --------
 `mkfs.btrfs`(8), `ionice`(1),
-- 
2.1.3

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