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authorOlga Kornievskaia <kolga@netapp.com>2018-07-20 18:19:20 -0400
committerJ. Bruce Fields <bfields@redhat.com>2018-09-25 20:34:54 -0400
commite0639dc5805a9d4faaa2c07ad98fa853b9529dd3 (patch)
tree6807e44cd08cf5035f46d4f01d1a0db486cac7d0 /fs/nfsd/netns.h
parent885e2bf3ea5121975ade0d7866ab6226a8547dc9 (diff)
downloadlinux-e0639dc5805a9d4faaa2c07ad98fa853b9529dd3.tar.bz2
NFSD introduce async copy feature
Upon receiving a request for async copy, create a new kthread. If we get asynchronous request, make sure to copy the needed arguments/state from the stack before starting the copy. Then start the thread and reply back to the client indicating copy is asynchronous. nfsd_copy_file_range() will copy in a loop over the total number of bytes is needed to copy. In case a failure happens in the middle, we ignore the error and return how much we copied so far. Once done creating a workitem for the callback workqueue and send CB_OFFLOAD with the results. The lifetime of the copy stateid is bound to the vfs copy. This way we don't need to keep the nfsd_net structure for the callback. We could keep it around longer so that an OFFLOAD_STATUS that came late would still get results, but clients should be able to deal without that. We handle OFFLOAD_CANCEL by sending a signal to the copy thread and calling kthread_stop. A client should cancel any ongoing copies before calling DESTROY_CLIENT; if not, we return a CLIENT_BUSY error. If the client is destroyed for some other reason (lease expiration, or server shutdown), we must clean up any ongoing copies ourselves. Signed-off-by: Olga Kornievskaia <kolga@netapp.com> [colin.king@canonical.com: fix leak in error case] [bfields@fieldses.org: remove signalling, merge patches] Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/netns.h')
-rw-r--r--fs/nfsd/netns.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 426f55005697..32cb8c027483 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -123,6 +123,14 @@ struct nfsd_net {
wait_queue_head_t ntf_wq;
atomic_t ntf_refcnt;
+
+ /*
+ * clientid and stateid data for construction of net unique COPY
+ * stateids.
+ */
+ u32 s2s_cp_cl_id;
+ struct idr s2s_cp_stateids;
+ spinlock_t s2s_cp_lock;
};
/* Simple check to find out if a given net was properly initialized */