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dm snapshot: add merging

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Merging is started when origin is resumed and it is stopped when
origin is suspended or when the merging snapshot is destroyed or
errors are detected.

Merging is not yet interlocked with writes: this will be handled in
subsequent patches.

The code relies on callbacks from a private kcopyd thread.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka
2009-12-10 23:52:32 +00:00
committed by Alasdair G Kergon
parent 9d3b15c4c7
commit 1e03f97e43
2 changed files with 244 additions and 6 deletions
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11
drivers/md/dm-exception-store.h
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@ -154,6 +154,13 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_exception *e)
BUG_ON(!dm_consecutive_chunk_count(e));
}
static inline void dm_consecutive_chunk_count_dec(struct dm_exception *e)
{
BUG_ON(!dm_consecutive_chunk_count(e));
e->new_chunk -= (1ULL << DM_CHUNK_NUMBER_BITS);
}
# else
# define DM_CHUNK_CONSECUTIVE_BITS 0
@ -171,6 +178,10 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_exception *e)
{
}
static inline void dm_consecutive_chunk_count_dec(struct dm_exception *e)
{
}
# endif
/*