X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fdevice-mapper%2Fsnapshot.txt;h=a5009c8300f3364a98e8982c9697f1dee789346f;hb=b98adfccdf5f8dd34ae56a2d5adbe2c030bd4674;hp=dca274ff40052e31cd3a0d6badd23003648a37a7;hpb=e484585ec3ee66cd07a627d3a9e2364640a3807f;p=linux-2.6-omap-h63xx.git

diff --git a/Documentation/device-mapper/snapshot.txt b/Documentation/device-mapper/snapshot.txt
index dca274ff400..a5009c8300f 100644
--- a/Documentation/device-mapper/snapshot.txt
+++ b/Documentation/device-mapper/snapshot.txt
@@ -19,7 +19,6 @@ There are two dm targets available: snapshot and snapshot-origin.
 *) snapshot-origin <origin>
 
 which will normally have one or more snapshots based on it.
-You must create the snapshot-origin device before you can create snapshots.
 Reads will be mapped directly to the backing device. For each write, the
 original data will be saved in the <COW device> of each snapshot to keep
 its visible content unchanged, at least until the <COW device> fills up.
@@ -27,7 +26,7 @@ its visible content unchanged, at least until the <COW device> fills up.
 
 *) snapshot <origin> <COW device> <persistent?> <chunksize>
 
-A snapshot is created of the <origin> block device. Changed chunks of
+A snapshot of the <origin> block device is created. Changed chunks of
 <chunksize> sectors will be stored on the <COW device>.  Writes will
 only go to the <COW device>.  Reads will come from the <COW device> or
 from <origin> for unchanged data.  <COW device> will often be
@@ -37,6 +36,8 @@ the amount of free space and expand the <COW device> before it fills up.
 
 <persistent?> is P (Persistent) or N (Not persistent - will not survive
 after reboot).
+The difference is that for transient snapshots less metadata must be
+saved on disk - they can be kept in memory by the kernel.
 
 
 How this is used by LVM2