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btrfs-progs: docs: note about read-only mount for send

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Clarify that read-only mount is not sufficient.

Issue: #493
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2022-09-21 09:55:19 +02:00
parent f68139dbb5
commit 958e2fc442
1 changed files with 3 additions and 1 deletions
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Documentation/btrfs-send.rst
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@ -16,7 +16,9 @@ The command operates in two modes: full and incremental.
All snapshots involved in one send command must be read-only, and this status
cannot be changed as long as there's a running send operation that uses the
snapshot.
snapshot. Read-only mount of the subvolume is not sufficient, there's no way to
guarantee that there won't be any other writable mount of the same subvolume
that would potentially write while send would be running.
In the full mode, the entire snapshot data and metadata will end up in the
stream.