osd: skip pgmeta object on remove_dir

Signed-off-by: Sage Weil <sage@redhat.com>
osd/PG: define pgmeta_oid member

Signed-off-by: Sage Weil <sage@redhat.com>
osd: don't need to pass object names via ctor

Calculate biginfo on the fly.

Signed-off-by: Sage Weil <sage@redhat.com>
osd: move PG collection creation into static PG method

Signed-off-by: Sage Weil <sage@redhat.com>
osd/PGLog: take ghobject_t instead of hobject_t

Signed-off-by: Sage Weil <sage@redhat.com>
osd/PGLog: explicitly pass log_oid collection

Do not assume the log_oid is ine the 'meta' collection.

Signed-off-by: Sage Weil <sage@redhat.com>
osd: move pg log and info to a per-pg object

Move all PG metadata (info, biginfo, epoch, and log) to a single per-PG
object.  This should make it easier for ObjectStore implementations to
avoid lock contention in the write path.

Signed-off-by: Sage Weil <sage@redhat.com>
osd: write pg log to new pgmeta object

Signed-off-by: Sage Weil <sage@redhat.com>