dm snapshot: track snapshot reads

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Whenever a snapshot read gets mapped through to the origin, track it in
a per-snapshot hash table indexed by chunk number, using memory allocated
from a new per-snapshot mempool.

We need to track these reads to avoid race conditions which will be fixed
by patches that follow.

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

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This commit is contained in:

Mikulas Patocka 2008-07-21 12:00:32 +01:00 • committed by Alasdair G Kergon

parent def052d21c

commit cd45daffd1

2 changed files with 106 additions and 10 deletions

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107

drivers/md/dm-snap.c

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9

drivers/md/dm-snap.h

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