dm table: add singleton feature

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Introduce the concept of a singleton table which contains exactly one target.

If a target type sets the DM_TARGET_SINGLETON feature bit device-mapper
will ensure that any table that includes that target contains no others.

The thin provisioning pool target uses this.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>

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This commit is contained in:

Alasdair G Kergon 2011-10-31 20:19:00 +00:00

parent 7f06965390

commit 3791e2fc0e

2 changed files with 26 additions and 4 deletions

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16

drivers/md/dm-table.c

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14

include/linux/device-mapper.h

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