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dm cache metadata: use bitset cursor api to load discard bitset 

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2016-10-03 14:16:20 -04:00 committed by Mike Snitzer
parent 6fe28dbf05
commit ae4a46a1f6
1 changed files with 28 additions and 20 deletions
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48
drivers/md/dm-cache-metadata.c
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@ -995,14 +995,6 @@ static int __clear_discard(struct dm_cache_metadata *cmd, dm_dblock_t b)
from_dblock(b), &cmd->discard_root);
}
static int __is_discarded(struct dm_cache_metadata *cmd, dm_dblock_t b,
bool *is_discarded)
{
return dm_bitset_test_bit(&cmd->discard_info, cmd->discard_root,
from_dblock(b), &cmd->discard_root,
is_discarded);
}
static int __discard(struct dm_cache_metadata *cmd,
dm_dblock_t dblock, bool discard)
{
@ -1032,22 +1024,38 @@ static int __load_discards(struct dm_cache_metadata *cmd,
load_discard_fn fn, void *context)
{
int r = 0;
dm_block_t b;
bool discard;
uint32_t b;
struct dm_bitset_cursor c;
for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
dm_dblock_t dblock = to_dblock(b);
if (from_dblock(cmd->discard_nr_blocks) == 0)
/* nothing to do */
return 0;
if (cmd->clean_when_opened) {
r = __is_discarded(cmd, dblock, &discard);
if (cmd->clean_when_opened) {
r = dm_bitset_flush(&cmd->discard_info, cmd->discard_root, &cmd->discard_root);
if (r)
return r;
r = dm_bitset_cursor_begin(&cmd->discard_info, cmd->discard_root,
from_dblock(cmd->discard_nr_blocks), &c);
if (r)
return r;
for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
r = fn(context, cmd->discard_block_size, to_dblock(b),
dm_bitset_cursor_get_value(&c));
if (r)
break;
}
dm_bitset_cursor_end(&c);
} else {
for (b = 0; b < from_dblock(cmd->discard_nr_blocks); b++) {
r = fn(context, cmd->discard_block_size, to_dblock(b), false);
if (r)
return r;
} else
discard = false;
r = fn(context, cmd->discard_block_size, dblock, discard);
if (r)
break;
}
}
return r;