dm: bind new table before destroying old

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When replacing a mapped device's table during a 'resume', delay the
destruction of the old table until the new one is successfully in place.

This will make it easier for a later patch to transfer internal state
information from the old table to the new one (something we do not currently
support) while giving us more options for reversion if a later part
of the operation fails.

Devices are always in the suspended state during dm_swap_table().
This patch reinforces the requirement that all I/O must have been
flushed from the table targets while in this state (including any in
workqueues).  In the case of 'noflush' suspending, unprocessed
I/O should have been 'pushed back' to the dm core prior to this point,
for resubmission after the new table is in place.

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

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This commit is contained in:

Alasdair G Kergon 2009-12-10 23:52:23 +00:00

parent 1d0f3ce832

commit a794015597

2 changed files with 14 additions and 5 deletions

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3

drivers/md/dm-table.c

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16

drivers/md/dm.c

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