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dm cache metadata: use cursor api in blocks_are_clean_separate_dirty()

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Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-10-04 15:00:47 -04:00
parent 9b696229aa
commit 7f1b21591a
1 changed files with 26 additions and 7 deletions
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33
drivers/md/dm-cache-metadata.c
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@ -931,27 +931,46 @@ static int blocks_are_clean_separate_dirty(struct dm_cache_metadata *cmd,
bool dirty_flag; bool dirty_flag;
*result = true; *result = true;
// FIXME: use a cursor so we can benefit from preloading metadata. r = dm_bitset_cursor_begin(&cmd->dirty_info, cmd->dirty_root,
from_cblock(begin), &cmd->dirty_cursor);
if (r) {
DMERR("%s: dm_bitset_cursor_begin for dirty failed", __func__);
return r;
}
r = dm_bitset_cursor_skip(&cmd->dirty_cursor, from_cblock(begin));
if (r) {
DMERR("%s: dm_bitset_cursor_skip for dirty failed", __func__);
dm_bitset_cursor_end(&cmd->dirty_cursor);
return r;
}
while (begin != end) { while (begin != end) {
/* /*
* We assume that unmapped blocks have their dirty bit * We assume that unmapped blocks have their dirty bit
* cleared. * cleared.
*/ */
r = dm_bitset_test_bit(&cmd->dirty_info, cmd->dirty_root, dirty_flag = dm_bitset_cursor_get_value(&cmd->dirty_cursor);
from_cblock(begin), &cmd->dirty_root, &dirty_flag);
if (r)
return r;
if (dirty_flag) { if (dirty_flag) {
DMERR("cache block %llu is dirty", DMERR("%s: cache block %llu is dirty", __func__,
(unsigned long long) from_cblock(begin)); (unsigned long long) from_cblock(begin));
dm_bitset_cursor_end(&cmd->dirty_cursor);
*result = false; *result = false;
return 0; return 0;
} }
r = dm_bitset_cursor_next(&cmd->dirty_cursor);
if (r) {
DMERR("%s: dm_bitset_cursor_next for dirty failed", __func__);
dm_bitset_cursor_end(&cmd->dirty_cursor);
return r;
}
begin = to_cblock(from_cblock(begin) + 1); begin = to_cblock(from_cblock(begin) + 1);
} }
dm_bitset_cursor_end(&cmd->dirty_cursor);
return 0; return 0;
} }