kernel/Documentation/device-mapper/snapshot.txt, branch linux-4.3.y

dm snapshot: add new persistent store option to support overflow

2015-10-09T20:57:03Z

Commit 76c44f6d80 introduced the possibly for "Overflow" to be reported by the snapshot device's status. Older userspace (e.g. lvm2) does not handle the "Overflow" status response. Fix this incompatibility by requiring newer userspace code, that can cope with "Overflow", request the persistent store with overflow support by using "PO" (Persistent with Overflow) for the snapshot store type. Reported-by: Zdenek Kabelac Fixes: 76c44f6d80 ("dm snapshot: don't invalidate on-disk image on snapshot write overflow") Reviewed-by: Mikulas Patocka Signed-off-by: Mike Snitzer

dm: document when snapshot has finished merging

2010-03-06T02:29:56Z

Update Documentation/device-mapper/snapshot.txt to cover "How to determine when a snapshot has finished merging". Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm snapshot: add merge target

2009-12-10T23:52:30Z

The snapshot-merge target allows a snapshot to be merged back into the snapshot's origin device. One anticipated use of snapshot merging is the rollback of filesystems to back out problematic system upgrades. This patch adds snapshot-merge target management to both dm_snapshot_init() and dm_snapshot_exit(). As an initial place-holder, snapshot-merge is identical to the snapshot target. Documentation is provided. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

[PATCH] Fix dm-snapshot tutorial in Documentation

2005-11-07T15:53:54Z

I've recently added this documentation, Alasdair gave some corrections, and here are some further corrections on top of his work (partly style issue, partly a technical error due to different past experience, partly a note which I've added - i.e. transient snapshots are lighter). Cc: Alasdair G Kergon Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Add dm-snapshot tutorial in Documentation

2005-09-23T05:17:37Z

I've recently discovered the real functionality of device-mapper snapshots, and since they are not well known, I've decided to write some docs for them. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds