linux-toradex.git/include/linux/ceph/osd_client.h, branch v3.14.3

libceph: follow redirect replies from osds

2014-01-27T21:57:53+00:00

Follow redirect replies from osds, for details see ceph.git commit
fbbe3ad1220799b7bb00ea30fce581c5eadaf034.

v1 (current) version of redirect reply consists of oloc and oid, which
expands to pool, key, nspace, hash and oid.  However, server-side code
that would populate anything other than pool doesn't exist yet, and
hence this commit adds support for pool redirects only.  To make sure
that future server-side updates don't break us, we decode all fields
and, if any of key, nspace, hash or oid have a non-default value, error
out with "corrupt osd_op_reply ..." message.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Sage Weil

libceph: rename ceph_osd_request::r_{oloc,oid} to r_base_{oloc,oid}

2014-01-27T21:57:49+00:00

Rename ceph_osd_request::r_{oloc,oid} to r_base_{oloc,oid} before
introducing r_target_{oloc,oid} needed for redirects.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Sage Weil

libceph: introduce and start using oid abstraction

2014-01-27T21:57:28+00:00

In preparation for tiering support, which would require having two
(base and target) object names for each osd request and also copying
those names around, introduce struct ceph_object_id (oid) and a couple
helpers to facilitate those copies and encapsulate the fact that object
name is not necessarily a NUL-terminated string.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Sage Weil

libceph: rename MAX_OBJ_NAME_SIZE to CEPH_MAX_OID_NAME_LEN

2014-01-27T21:57:24+00:00

In preparation for adding oid abstraction, rename MAX_OBJ_NAME_SIZE to
CEPH_MAX_OID_NAME_LEN.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Sage Weil

libceph: start using oloc abstraction

2014-01-27T21:57:03+00:00

Instead of relying on pool fields in ceph_file_layout (for mapping) and
ceph_pg (for enconding), start using ceph_object_locator (oloc)
abstraction.  Note that userspace oloc currently consists of pool, key,
nspace and hash fields, while this one contains only a pool.  This is
OK, because at this point we only send (i.e. encode) olocs and never
have to receive (i.e. decode) them.

This makes keeping a copy of ceph_file_layout in every osd request
unnecessary, so ceph_osd_request::r_file_layout field is nuked.

Signed-off-by: Ilya Dryomov 
Reviewed-by: Sage Weil

libceph: block I/O when PAUSE or FULL osd map flags are set

2013-12-13T17:13:29+00:00

The PAUSEWR and PAUSERD flags are meant to stop the cluster from
processing writes and reads, respectively. The FULL flag is set when
the cluster determines that it is out of space, and will no longer
process writes.  PAUSEWR and PAUSERD are purely client-side settings
already implemented in userspace clients. The osd does nothing special
with these flags.

When the FULL flag is set, however, the osd responds to all writes
with -ENOSPC. For cephfs, this makes sense, but for rbd the block
layer translates this into EIO.  If a cluster goes from full to
non-full quickly, a filesystem on top of rbd will not behave well,
since some writes succeed while others get EIO.

Fix this by blocking any writes when the FULL flag is set in the osd
client. This is the same strategy used by userspace, so apply it by
default.  A follow-on patch makes this configurable.

__map_request() is called to re-target osd requests in case the
available osds changed.  Add a paused field to a ceph_osd_request, and
set it whenever an appropriate osd map flag is set.  Avoid queueing
paused requests in __map_request(), but force them to be resent if
they become unpaused.

Also subscribe to the next osd map from the monitor if any of these
flags are set, so paused requests can be unblocked as soon as
possible.

Fixes: http://tracker.ceph.com/issues/6079

Reviewed-by: Sage Weil 
Signed-off-by: Josh Durgin

libceph: add function to ensure notifies are complete

2013-09-09T18:15:49+00:00

Without a way to flush the osd client's notify workqueue, a watch
event that is unregistered could continue receiving callbacks
indefinitely.

Unregistering the event simply means no new notifies are added to the
queue, but there may still be events in the queue that will call the
watch callback for the event. If the queue is flushed after the event
is unregistered, the caller can be sure no more watch callbacks will
occur for the canceled watch.

Signed-off-by: Josh Durgin 
Reviewed-by: Sage Weil 
Reviewed-by: Alex Elder

libceph: fix safe completion

2013-07-03T22:32:44+00:00

handle_reply() calls complete_request() only if the first OSD reply
has ONDISK flag.

Signed-off-by: Yan, Zheng 
Reviewed-by: Sage Weil

libceph: use slab cache for osd client requests

2013-05-02T16:58:41+00:00

Create a slab cache to manage allocation of ceph_osdc_request
structures.

This resolves:
    http://tracker.ceph.com/issues/3926

Signed-off-by: Alex Elder 
Reviewed-by: Josh Durgin

libceph: support pages for class request data

2013-05-02T04:19:06+00:00

Add the ability to provide an array of pages as outbound request
data for object class method calls.

Signed-off-by: Alex Elder 
Reviewed-by: Josh Durgin