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dm exception store: introduce area_location function

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Move this logic to a function, because it will be reused later.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2008-10-10 13:37:00 +01:00 committed by Alasdair G Kergon
parent f7c83e2e47
commit a481db7846
1 changed files with 9 additions and 2 deletions
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11
drivers/md/dm-exception-store.c
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@ -208,6 +208,14 @@ static int chunk_io(struct pstore *ps, uint32_t chunk, int rw, int metadata)
return req.result;
}
/*
* Convert a metadata area index to a chunk index.
*/
static chunk_t area_location(struct pstore *ps, chunk_t area)
{
return 1 + ((ps->exceptions_per_area + 1) * area);
}
/*
* Read or write a metadata area. Remembering to skip the first
* chunk which holds the header.
@ -217,8 +225,7 @@ static int area_io(struct pstore *ps, uint32_t area, int rw)
int r;
uint32_t chunk;
/* convert a metadata area index to a chunk index */
chunk = 1 + ((ps->exceptions_per_area + 1) * area);
chunk = area_location(ps, area);
r = chunk_io(ps, chunk, rw, 0);
if (r)