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dm persistent data: add cursor skip functions to the cursor APIs

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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
2016-10-05 10:40:39 -04:00
committed by Mike Snitzer
parent 683bb1a374
commit 9b696229aa
6 changed files with 70 additions and 0 deletions
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35
drivers/md/persistent-data/dm-bitset.c
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@@ -273,6 +273,41 @@ int dm_bitset_cursor_next(struct dm_bitset_cursor *c)
}
EXPORT_SYMBOL_GPL(dm_bitset_cursor_next);
int dm_bitset_cursor_skip(struct dm_bitset_cursor *c, uint32_t count)
{
int r;
__le64 *value;
uint32_t nr_array_skip;
uint32_t remaining_in_word = 64 - c->bit_index;
if (c->entries_remaining < count)
return -ENODATA;
if (count < remaining_in_word) {
c->bit_index += count;
c->entries_remaining -= count;
return 0;
} else {
c->entries_remaining -= remaining_in_word;
count -= remaining_in_word;
}
nr_array_skip = (count / 64) + 1;
r = dm_array_cursor_skip(&c->cursor, nr_array_skip);
if (r)
return r;
dm_array_cursor_get_value(&c->cursor, (void **) &value);
c->entries_remaining -= count;
c->array_index += nr_array_skip;
c->bit_index = count & 63;
c->current_bits = le64_to_cpu(*value);
return 0;
}
EXPORT_SYMBOL_GPL(dm_bitset_cursor_skip);
bool dm_bitset_cursor_get_value(struct dm_bitset_cursor *c)
{
return test_bit(c->bit_index, (unsigned long *) &c->current_bits);