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dm thin: fix documentation relative to low water mark threshold
[ Upstream commit 9b28a1102e
]
Fixes:
1. The use of "exceeds" when the opposite of exceeds, falls below,
was meant.
2. Properly speaking, a table can not exceed a threshold.
It emphasizes the important point, which is that it is the userspace
daemon's responsibility to check for low free space when a device
is resumed, since it won't get a special event indicating low free
space in that situation.
Signed-off-by: mulhern <amulhern@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 5 additions and 3 deletions
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@ -112,9 +112,11 @@ $low_water_mark is expressed in blocks of size $data_block_size. If
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free space on the data device drops below this level then a dm event
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will be triggered which a userspace daemon should catch allowing it to
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extend the pool device. Only one such event will be sent.
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Resuming a device with a new table itself triggers an event so the
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userspace daemon can use this to detect a situation where a new table
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already exceeds the threshold.
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No special event is triggered if a just resumed device's free space is below
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the low water mark. However, resuming a device always triggers an
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event; a userspace daemon should verify that free space exceeds the low
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water mark when handling this event.
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A low water mark for the metadata device is maintained in the kernel and
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will trigger a dm event if free space on the metadata device drops below
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