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2017-07-17libceph: don't call encode_request_finish() on MOSDBackoff messagesIlya Dryomov
encode_request_finish() is for MOSDOp messages. Calling it on MOSDBackoff ack-block messages corrupts them. Fixes: a02a946dfe96 ("libceph: respect RADOS_BACKOFF backoffs") Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: respect RADOS_BACKOFF backoffsIlya Dryomov
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: avoid unnecessary pi lookups in calc_target()Ilya Dryomov
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: use target pi for calc_target() calculationsIlya Dryomov
For luminous and beyond we are encoding the actual spgid, which requires operating with the correct pg_num, i.e. that of the target pool. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: always populate t->target_{oid,oloc} in calc_target()Ilya Dryomov
need_check_tiering logic doesn't make a whole lot of sense. Drop it and apply tiering unconditionally on every calc_target() call instead. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: make sure need_resend targets reflect latest mapIlya Dryomov
Otherwise we may miss events like PG splits, pool deletions, etc when we get multiple incremental maps at once. Because check_pool_dne() can now be fed an unlinked request, finish_request() needed to be taught to handle unlinked requests. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: delete from need_resend_linger before check_linger_pool_dne()Ilya Dryomov
When processing a map update consisting of multiple incrementals, we may end up running check_linger_pool_dne() on a lingering request that was previously added to need_resend_linger list. If it is concluded that the target pool doesn't exist, the request is killed off while still on need_resend_linger list, which leads to a crash on a NULL lreq->osd in kick_requests(): libceph: linger_id 18446462598732840961 pool does not exist BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: ceph_osdc_handle_map+0x4ae/0x870 Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: resend on PG splits if OSD has RESEND_ON_SPLITIlya Dryomov
Note that ceph_osd_request_target fields are updated regardless of RESEND_ON_SPLIT. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: drop need_resend from calc_target()Ilya Dryomov
Replace it with more fine-grained bools to separate updating ceph_osd_request_target fields and the decision to resend. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: MOSDOp v8 encoding (actual spgid + full hash)Ilya Dryomov
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: encode_{pgid,oloc}() helpersIlya Dryomov
Factor out encode_{pgid,oloc}() and use ceph_encode_string() for oid. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: introduce ceph_spg, ceph_pg_to_primary_shard()Ilya Dryomov
Store both raw pgid and actual spgid in ceph_osd_request_target. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-07-07libceph: fold [l]req->last_force_resend into ceph_osd_request_targetIlya Dryomov
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-10Merge tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-clientLinus Torvalds
Pull ceph updates from Ilya Dryomov: "The two main items are support for disabling automatic rbd exclusive lock transfers from myself and the long awaited -ENOSPC handling series from Jeff. The former will allow rbd users to take advantage of exclusive lock's built-in blacklist/break-lock functionality while staying in control of who owns the lock. With the latter in place, we will abort filesystem writes on -ENOSPC instead of having them block indefinitely. Beyond that we've got the usual pile of filesystem fixes from Zheng, some refcount_t conversion patches from Elena and a patch for an ancient open() flags handling bug from Alexander" * tag 'ceph-for-4.12-rc1' of git://github.com/ceph/ceph-client: (31 commits) ceph: fix memory leak in __ceph_setxattr() ceph: fix file open flags on ppc64 ceph: choose readdir frag based on previous readdir reply rbd: exclusive map option rbd: return ResponseMessage result from rbd_handle_request_lock() rbd: kill rbd_is_lock_supported() rbd: support updating the lock cookie without releasing the lock rbd: store lock cookie rbd: ignore unlock errors rbd: fix error handling around rbd_init_disk() rbd: move rbd_unregister_watch() call into rbd_dev_image_release() rbd: move rbd_dev_destroy() call out of rbd_dev_image_release() ceph: when seeing write errors on an inode, switch to sync writes Revert "ceph: SetPageError() for writeback pages if writepages fails" ceph: handle epoch barriers in cap messages libceph: add an epoch_barrier field to struct ceph_osd_client libceph: abort already submitted but abortable requests when map or pool goes full libceph: allow requests to return immediately on full conditions if caller wishes libceph: remove req->r_replay_version ceph: make seeky readdir more efficient ...
2017-05-08fs: ceph: CURRENT_TIME with ktime_get_real_ts()Deepa Dinamani
CURRENT_TIME is not y2038 safe. The macro will be deleted and all the references to it will be replaced by ktime_get_* apis. struct timespec is also not y2038 safe. Retain timespec for timestamp representation here as ceph uses it internally everywhere. These references will be changed to use struct timespec64 in a separate patch. The current_fs_time() api is being changed to use vfs struct inode* as an argument instead of struct super_block*. Set the new mds client request r_stamp field using ktime_get_real_ts() instead of using current_fs_time(). Also, since r_stamp is used as mtime on the server, use timespec_trunc() to truncate the timestamp, using the right granularity from the superblock. This api will be transitioned to be y2038 safe along with vfs. Link: http://lkml.kernel.org/r/1491613030-11599-5-git-send-email-deepa.kernel@gmail.com Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> M: Ilya Dryomov <idryomov@gmail.com> M: "Yan, Zheng" <zyan@redhat.com> M: Sage Weil <sage@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-04libceph: add an epoch_barrier field to struct ceph_osd_clientJeff Layton
Cephfs can get cap update requests that contain a new epoch barrier in them. When that happens we want to pause all OSD traffic until the right map epoch arrives. Add an epoch_barrier field to ceph_osd_client that is protected by the osdc->lock rwsem. When the barrier is set, and the current OSD map epoch is below that, pause the request target when submitting the request or when revisiting it. Add a way for upper layers (cephfs) to update the epoch_barrier as well. If we get a new map, compare the new epoch against the barrier before kicking requests and request another map if the map epoch is still lower than the one we want. If we get a map with a full pool, or at quota condition, then set the barrier to the current epoch value. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-04libceph: abort already submitted but abortable requests when map or pool ↵Jeff Layton
goes full When a Ceph volume hits capacity, a flag is set in the OSD map to indicate that, and a new map is sprayed around the cluster. With cephfs we want it to shut down any abortable requests that are in progress with an -ENOSPC error as they'd just hang otherwise. Add a new ceph_osdc_abort_on_full helper function to handle this. It will first check whether there is an out-of-space condition in the cluster and then walk the tree and abort any request that has r_abort_on_full set with a -ENOSPC error. Call this new function directly whenever we get a new OSD map. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-04libceph: allow requests to return immediately on full conditions if caller ↵Jeff Layton
wishes Usually, when the osd map is flagged as full or the pool is at quota, write requests just hang. This is not what we want for cephfs, where it would be better to simply report -ENOSPC back to userland instead of stalling. If the caller knows that it will want an immediate error return instead of blocking on a full or at-quota error condition then allow it to set a flag to request that behavior. Set that flag in ceph_osdc_new_request (since ceph.ko is the only caller), and on any other write request from ceph.ko. A later patch will deal with requests that were submitted before the new map showing the full condition came in. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-04libceph: remove req->r_replay_versionJeff Layton
Nothing uses this anymore with the removal of the ack vs. commit code. Remove the field and just encode zeroes into place in the request encoding. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-05-04libceph: convert ceph_osd.o_ref from atomic_t to refcount_tElena Reshetova
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2017-03-07libceph: osd_request_timeout optionIlya Dryomov
osd_request_timeout specifies how many seconds to wait for a response from OSDs before returning -ETIMEDOUT from an OSD request. 0 (default) means no limit. osd_request_timeout is osdkeepalive-precise -- in-flight requests are swept through every osdkeepalive seconds. With ack vs commit behaviour gone, abort_request() is really simple. This is based on a patch from Artur Molchanov <artur.molchanov@synesis.ru>. Tested-by: Artur Molchanov <artur.molchanov@synesis.ru> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-28Merge tag 'ceph-for-4.11-rc1' of git://github.com/ceph/ceph-clientLinus Torvalds
Pull ceph updates from Ilya Dryomov: "This time around we have: - support for rbd data-pool feature, which enables rbd images on erasure-coded pools (myself). CEPH_PG_MAX_SIZE has been bumped to allow erasure-coded profiles with k+m up to 32. - a patch for ceph_d_revalidate() performance regression introduced in 4.9, along with some cleanups in the area (Jeff Layton) - a set of fixes for unsafe ->d_parent accesses in CephFS (Jeff Layton) - buffered reads are now processed in rsize windows instead of rasize windows (Andreas Gerstmayr). The new default for rsize mount option is 64M. - ack vs commit distinction is gone, greatly simplifying ->fsync() and MOSDOpReply handling code (myself) ... also a few filesystem bug fixes from Zheng, a CRUSH sync up (CRUSH computations are still serialized though) and several minor fixes and cleanups all over" * tag 'ceph-for-4.11-rc1' of git://github.com/ceph/ceph-client: (52 commits) libceph, rbd, ceph: WRITE | ONDISK -> WRITE libceph: get rid of ack vs commit ceph: remove special ack vs commit behavior ceph: tidy some white space in get_nonsnap_parent() crush: fix dprintk compilation crush: do is_out test only if we do not collide ceph: remove req from unsafe list when unregistering it rbd: constify device_type structure rbd: kill obj_request->object_name and rbd_segment_name_cache rbd: store and use obj_request->object_no rbd: RBD_V{1,2}_DATA_FORMAT macros rbd: factor out __rbd_osd_req_create() rbd: set offset and length outside of rbd_obj_request_create() rbd: support for data-pool feature rbd: introduce rbd_init_layout() rbd: use rbd_obj_bytes() more rbd: remove now unused rbd_obj_request_wait() and helpers rbd: switch rbd_obj_method_sync() to ceph_osdc_call() libceph: pass reply buffer length through ceph_osdc_call() rbd: do away with obj_request in rbd_obj_read_sync() ...
2017-02-24libceph, rbd, ceph: WRITE | ONDISK -> WRITEIlya Dryomov
CEPH_OSD_FLAG_ONDISK is set in account_request(). Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-24libceph: get rid of ack vs commitIlya Dryomov
- CEPH_OSD_FLAG_ACK shouldn't be set anymore, so assert on it - remove support for handling ack replies (OSDs will send ack replies only if clients request them) - drop the "do lingering callbacks under osd->lock" logic from handle_reply() -- lreq->lock is sufficient in all three cases Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com>
2017-02-20libceph: pass reply buffer length through ceph_osdc_call()Ilya Dryomov
To spare checking for "this reply fits into a page, but does it fit into my buffer?" in some callers, osd_req_op_cls_response_data_pages() needs to know how big it is. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jason Dillaman <dillaman@redhat.com>
2017-02-20ceph: update readpages osd request according to size of pagesYan, Zheng
add_to_page_cache_lru() can fails, so the actual pages to read can be smaller than the initial size of osd request. We need to update osd request size in that case. Signed-off-by: Yan, Zheng <zyan@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com>
2017-01-14locking/atomic, kref: Add kref_read()Peter Zijlstra
Since we need to change the implementation, stop exposing internals. Provide kref_read() to read the current reference count; typically used for debug messages. Kills two anti-patterns: atomic_read(&kref->refcount) kref->refcount.counter Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-12-14libceph: remove now unused finish_request() wrapperIlya Dryomov
Kill the wrapper and rename __finish_request() to finish_request(). Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-12-14libceph: always signal completion when doneIlya Dryomov
r_safe_completion is currently, and has always been, signaled only if on-disk ack was requested. It's there for fsync and syncfs, which wait for in-flight writes to flush - all data write requests set ONDISK. However, the pool perm check code introduced in 4.2 sends a write request with only ACK set. An unfortunately timed syncfs can then hang forever: r_safe_completion won't be signaled because only an unsafe reply was requested. We could patch ceph_osdc_sync() to skip !ONDISK write requests, but that is somewhat incomplete and yet another special case. Instead, rename this completion to r_done_completion and always signal it when the OSD client is done with the request, whether unsafe, safe, or error. This is a bit cleaner and helps with the cancellation code. Reported-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-12-12libceph: drop len argument of *verify_authorizer_reply()Ilya Dryomov
The length of the reply is protocol-dependent - for cephx it's ceph_x_authorize_reply. Nothing sensible can be passed from the messenger layer anyway. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
2016-11-10libceph: initialize last_linger_id with a large integerIlya Dryomov
osdc->last_linger_id is a counter for lreq->linger_id, which is used for watch cookies. Starting with a large integer should ease the task of telling apart kernel and userspace clients. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-08-24rbd: retry watch re-registration periodicallyIlya Dryomov
Revamp watch code to support retrying watch re-registration: - add rbd_dev->watch_state for more robust errcb handling - store watch cookie separately to avoid dereferencing watch_handle which is set to NULL on unwatch - move re-register code into a delayed work and retry re-registration every second, unless the client is blacklisted Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Tested-by: Mike Christie <mchristi@redhat.com>
2016-08-24libceph: add ceph_osdc_call() single-page helperDouglas Fuller
Add a convenience function to osd_client to send Ceph OSD 'class' ops. The interface assumes that the request and reply data each consist of single pages. Signed-off-by: Douglas Fuller <dfuller@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-24libceph: support for CEPH_OSD_OP_LIST_WATCHERSDouglas Fuller
Add support for this Ceph OSD op, needed to support the RBD exclusive lock feature. Signed-off-by: Douglas Fuller <dfuller@redhat.com> [idryomov@gmail.com: refactor, misc fixes throughout] Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Alex Elder <elder@linaro.org>
2016-08-08libceph: fix return value check in alloc_msg_with_page_vector()Wei Yongjun
In case of error, the function ceph_alloc_page_vector() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Fixes: 1907920324f1 ('libceph: support for sending notifies') Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: make sure redirect does not change namespaceYan, Zheng
Signed-off-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: rados pool namespace supportYan, Zheng
Add pool namesapce pointer to struct ceph_file_layout and struct ceph_object_locator. Pool namespace is used by when mapping object to PG, it's also used when composing OSD request. The namespace pointer in struct ceph_file_layout is RCU protected. So libceph can read namespace without taking lock. Signed-off-by: Yan, Zheng <zyan@redhat.com> [idryomov@gmail.com: ceph_oloc_destroy(), misc minor changes] Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-07-28libceph: define new ceph_file_layout structureYan, Zheng
Define new ceph_file_layout structure and rename old ceph_file_layout to ceph_file_layout_legacy. This is preparation for adding namespace to ceph_file_layout structure. Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-05-30libceph: use %s instead of %pE in dout()sIlya Dryomov
Commit d30291b985d1 ("libceph: variable-sized ceph_object_id") changed dout()s in what is now encode_request() and ceph_object_locator_to_pg() to use %pE, mostly to document that, although all rbd and cephfs object names are NULL-terminated strings, ceph_object_id will handle any RADOS object name, including the one containing NULs, just fine. However, it turns out that vbin_printf() can't handle anything but ints and %s - all %p suffixes are ignored. The buffer %p** points to isn't recorded, resulting in trash in the messages if the buffer had been reused by the time bstr_printf() got to it. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-30libceph: put request only if it's done in handle_reply()Ilya Dryomov
handle_reply() may be called twice on the same request: on ack and then on commit. This occurs on btrfs-formatted OSDs or if cephfs sync write path is triggered - CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK. handle_reply() handles this with the help of done_request(). Fixes: 5aea3dcd5021 ("libceph: a major OSD client update") Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-30libceph: change ceph_osdmap_flag() to take osdcIlya Dryomov
For the benefit of every single caller, take osdc instead of map. Also, now that osdc->osdmap can't ever be NULL, drop the check. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: make ceph_osdc_wait_request() uninterruptibleYan, Zheng
Ceph_osdc_wait_request() is used when cephfs issues sync IO. In most cases, the sync IO should be uninterruptible. The fix is use killale wait function in ceph_osdc_wait_request(). Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-05-26libceph: replace ceph_monc_request_next_osdmap()Ilya Dryomov
... with a wrapper around maybe_request_map() - no need for two osdmap-specific functions. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: pool deletion detectionIlya Dryomov
This adds the "map check" infrastructure for sending osdmap version checks on CALC_TARGET_POOL_DNE and completing in-flight requests with -ENOENT if the target pool doesn't exist or has just been deleted. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: support for checking on status of watchIlya Dryomov
Implement ceph_osdc_watch_check() to be able to check on status of watch. Note that the time it takes for a watch/notify event to get delivered through the notify_wq is taken into account. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: support for sending notifiesIlya Dryomov
Implement ceph_osdc_notify() for sending notifies. Due to the fact that the current messenger can't do read-in into pagelists (it can only do write-out from them), I had to go with a page vector for a NOTIFY_COMPLETE payload, for now. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph, rbd: ceph_osd_linger_request, watch/notify v2Ilya Dryomov
This adds support and switches rbd to a new, more reliable version of watch/notify protocol. As with the OSD client update, this is mostly about getting the right structures linked into the right places so that reconnects are properly sent when needed. watch/notify v2 also requires sending regular pings to the OSDs - send_linger_ping(). A major change from the old watch/notify implementation is the introduction of ceph_osd_linger_request - linger requests no longer piggy back on ceph_osd_request. ceph_osd_event has been merged into ceph_osd_linger_request. All the details are now hidden within libceph, the interface consists of a simple pair of watch/unwatch functions and ceph_osdc_notify_ack(). ceph_osdc_watch() does return ceph_osd_linger_request, but only to keep the lifetime management simple. ceph_osdc_notify_ack() accepts an optional data payload, which is relayed back to the notifier. Portions of this patch are loosely based on work by Douglas Fuller <dfuller@redhat.com> and Mike Christie <michaelc@cs.wisc.edu>. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: wait_request_timeout()Ilya Dryomov
The unwatch timeout is currently implemented in rbd. With watch/unwatch code moving into libceph, we are going to need a ceph_osdc_wait_request() variant with a timeout. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: request_init() and request_release_checks()Ilya Dryomov
These are going to be used by request_reinit() code. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-05-26libceph: a major OSD client updateIlya Dryomov
This is a major sync up, up to ~Jewel. The highlights are: - per-session request trees (vs a global per-client tree) - per-session locking (vs a global per-client rwlock) - homeless OSD session - no ad-hoc global per-client lists - support for pool quotas - foundation for watch/notify v2 support - foundation for map check (pool deletion detection) support The switchover is incomplete: lingering requests can be setup and teared down but aren't ever reestablished. This functionality is restored with the introduction of the new lingering infrastructure (ceph_osd_linger_request, linger_work, etc) in a later commit. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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