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authorOlga Kornievskaia <kolga@netapp.com>2018-07-21 01:19:20 +0300
committerJ. Bruce Fields <bfields@redhat.com>2018-09-26 03:34:54 +0300
commite0639dc5805a9d4faaa2c07ad98fa853b9529dd3 (patch)
tree6807e44cd08cf5035f46d4f01d1a0db486cac7d0 /fs/nfsd/xdr4.h
parent885e2bf3ea5121975ade0d7866ab6226a8547dc9 (diff)
downloadlinux-e0639dc5805a9d4faaa2c07ad98fa853b9529dd3.tar.xz
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/xdr4.h')
-rw-r--r--fs/nfsd/xdr4.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 06cf218944c5..feeb6d4bdffd 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -532,6 +532,18 @@ struct nfsd4_copy {
struct nfsd4_callback cp_cb;
__be32 nfserr;
struct knfsd_fh fh;
+
+ struct nfs4_client *cp_clp;
+
+ struct file *file_src;
+ struct file *file_dst;
+
+ stateid_t cp_stateid;
+
+ struct list_head copies;
+ struct task_struct *copy_task;
+ refcount_t refcount;
+ bool stopped;
};
struct nfsd4_seek {