ReplicatedPG: fix stat uses to use the correct shard

Signed-off-by: Samuel Just <sam.just@inktank.com>
ReplicatedPG::fill_in_copy_get, use getattr_maybe_cache

Also, add user_only flag to getattr_maybe_cache and cleanup
the other user.

Signed-off-by: Samuel Just <sam.just@inktank.com>
ReplicatedPG: ensure that ec appends are aligned

When not writing out the last chunk, _write_copy_chunk
will trim the chunk to a stripe boundary for ec pools
and adjust cursor.data_offset to compensate.

Signed-off-by: Samuel Just <sam.just@inktank.com>
ECBackend: handle short reads

async reads may have a length past the end of the object.

Signed-off-by: Samuel Just <sam.just@inktank.com>
ReplicatedPG: assert no omap for ec pool in _write_copy_chunk and skip

Signed-off-by: Samuel Just <sam.just@inktank.com>
PG: fix scrub feature check

acting[0] isn't necessarily the primary.  Start at
0 and explicitely skip the primary.

Signed-off-by: Samuel Just <sam.just@inktank.com>
RadosModel: copyfrom should result in a dirty object

Signed-off-by: Samuel Just <sam.just@inktank.com>
ReplicatedPG::on_global_recover: requeue degraded, then unreadable

We need to requeue in reverse order since we are requeueing at the
front.

Signed-off-by: Samuel Just <sam.just@inktank.com>
ECBackend: deal with temp collection details in handle_sub_write

Signed-off-by: Samuel Just <sam.just@inktank.com>
PG::build_might_have_unfound: skip CRUSH_ITEM_NONE

Signed-off-by: Samuel Just <sam.just@inktank.com>
Merge remote-tracking branch 'upstream/wip-copyget' into next

Fixes: #7471
Reviewed-by: Greg Farnum <greg@inktank.com>