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dm cache: pull out some bitset utility functions for reuse

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Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-05-15 15:22:02 +01:00 • committed by Mike Snitzer
parent 20f6814b94
commit 451b9e0071
2 changed files with 28 additions and 24 deletions
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24
drivers/md/dm-cache-target.c
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@ -111,30 +111,6 @@ static void iot_io_end(struct io_tracker *iot, sector_t len)
/*----------------------------------------------------------------*/
static size_t bitset_size_in_bytes(unsigned nr_entries)
{
return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
}
static unsigned long *alloc_bitset(unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
return vzalloc(s);
}
static void clear_bitset(void *bitset, unsigned nr_entries)
{
size_t s = bitset_size_in_bytes(nr_entries);
memset(bitset, 0, s);
}
static void free_bitset(unsigned long *bits)
{
vfree(bits);
}
/*----------------------------------------------------------------*/
/*
* There are a couple of places where we let a bio run, but want to do some
* work before calling its endio function. We do this by temporarily