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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
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')
-rw-r--r--fs/nfsd/netns.h8
-rw-r--r--fs/nfsd/nfs4proc.c261
-rw-r--r--fs/nfsd/nfs4state.c38
-rw-r--r--fs/nfsd/nfs4xdr.c21
-rw-r--r--fs/nfsd/nfsctl.c1
-rw-r--r--fs/nfsd/state.h9
-rw-r--r--fs/nfsd/xdr4.h12
7 files changed, 326 insertions, 24 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 */
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 0c7832321010..edff074d38c7 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -36,6 +36,7 @@
#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/slab.h>
+#include <linux/kthread.h>
#include "idmap.h"
#include "cache.h"
@@ -1089,37 +1090,236 @@ out:
return status;
}
+void nfs4_put_copy(struct nfsd4_copy *copy)
+{
+ if (!refcount_dec_and_test(&copy->refcount))
+ return;
+ kfree(copy);
+}
+
+static bool
+check_and_set_stop_copy(struct nfsd4_copy *copy)
+{
+ bool value;
+
+ spin_lock(&copy->cp_clp->async_lock);
+ value = copy->stopped;
+ if (!copy->stopped)
+ copy->stopped = true;
+ spin_unlock(&copy->cp_clp->async_lock);
+ return value;
+}
+
+static void nfsd4_stop_copy(struct nfsd4_copy *copy)
+{
+ /* only 1 thread should stop the copy */
+ if (!check_and_set_stop_copy(copy))
+ kthread_stop(copy->copy_task);
+ nfs4_put_copy(copy);
+}
+
+static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
+{
+ struct nfsd4_copy *copy = NULL;
+
+ spin_lock(&clp->async_lock);
+ if (!list_empty(&clp->async_copies)) {
+ copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
+ copies);
+ refcount_inc(&copy->refcount);
+ }
+ spin_unlock(&clp->async_lock);
+ return copy;
+}
+
+void nfsd4_shutdown_copy(struct nfs4_client *clp)
+{
+ struct nfsd4_copy *copy;
+
+ while ((copy = nfsd4_get_copy(clp)) != NULL)
+ nfsd4_stop_copy(copy);
+}
+
+static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
+{
+ struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
+
+ nfs4_put_copy(copy);
+}
+
+static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
+ struct rpc_task *task)
+{
+ return 1;
+}
+
+static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
+ .release = nfsd4_cb_offload_release,
+ .done = nfsd4_cb_offload_done
+};
+
+static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
+{
+ copy->cp_res.wr_stable_how = NFS_UNSTABLE;
+ copy->cp_synchronous = sync;
+ gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
+}
+
+static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
+{
+ ssize_t bytes_copied = 0;
+ size_t bytes_total = copy->cp_count;
+ u64 src_pos = copy->cp_src_pos;
+ u64 dst_pos = copy->cp_dst_pos;
+
+ do {
+ if (kthread_should_stop())
+ break;
+ bytes_copied = nfsd_copy_file_range(copy->file_src, src_pos,
+ copy->file_dst, dst_pos, bytes_total);
+ if (bytes_copied <= 0)
+ break;
+ bytes_total -= bytes_copied;
+ copy->cp_res.wr_bytes_written += bytes_copied;
+ src_pos += bytes_copied;
+ dst_pos += bytes_copied;
+ } while (bytes_total > 0 && !copy->cp_synchronous);
+ return bytes_copied;
+}
+
+static __be32 nfsd4_do_copy(struct nfsd4_copy *copy, bool sync)
+{
+ __be32 status;
+ ssize_t bytes;
+
+ bytes = _nfsd_copy_file_range(copy);
+ /* for async copy, we ignore the error, client can always retry
+ * to get the error
+ */
+ if (bytes < 0 && !copy->cp_res.wr_bytes_written)
+ status = nfserrno(bytes);
+ else {
+ nfsd4_init_copy_res(copy, sync);
+ status = nfs_ok;
+ }
+
+ fput(copy->file_src);
+ fput(copy->file_dst);
+ return status;
+}
+
+static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
+{
+ dst->cp_src_pos = src->cp_src_pos;
+ dst->cp_dst_pos = src->cp_dst_pos;
+ dst->cp_count = src->cp_count;
+ dst->cp_synchronous = src->cp_synchronous;
+ memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
+ memcpy(&dst->fh, &src->fh, sizeof(src->fh));
+ dst->cp_clp = src->cp_clp;
+ dst->file_dst = get_file(src->file_dst);
+ dst->file_src = get_file(src->file_src);
+ memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
+}
+
+static void cleanup_async_copy(struct nfsd4_copy *copy)
+{
+ nfs4_free_cp_state(copy);
+ fput(copy->file_dst);
+ fput(copy->file_src);
+ spin_lock(&copy->cp_clp->async_lock);
+ list_del(&copy->copies);
+ spin_unlock(&copy->cp_clp->async_lock);
+ nfs4_put_copy(copy);
+}
+
+static int nfsd4_do_async_copy(void *data)
+{
+ struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
+ struct nfsd4_copy *cb_copy;
+
+ copy->nfserr = nfsd4_do_copy(copy, 0);
+ cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
+ if (!cb_copy)
+ goto out;
+ memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
+ cb_copy->cp_clp = copy->cp_clp;
+ cb_copy->nfserr = copy->nfserr;
+ memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
+ nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
+ &nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
+ nfsd4_run_cb(&cb_copy->cp_cb);
+out:
+ cleanup_async_copy(copy);
+ return 0;
+}
+
static __be32
nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_copy *copy = &u->copy;
- struct file *src, *dst;
__be32 status;
- ssize_t bytes;
+ struct nfsd4_copy *async_copy = NULL;
- status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
- &copy->cp_dst_stateid, &dst);
+ status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
+ &copy->file_src, &copy->cp_dst_stateid,
+ &copy->file_dst);
if (status)
goto out;
- bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
- dst, copy->cp_dst_pos, copy->cp_count);
+ copy->cp_clp = cstate->clp;
+ memcpy(&copy->fh, &cstate->current_fh.fh_handle,
+ sizeof(struct knfsd_fh));
+ if (!copy->cp_synchronous) {
+ struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
- if (bytes < 0)
- status = nfserrno(bytes);
- else {
- copy->cp_res.wr_bytes_written = bytes;
- copy->cp_res.wr_stable_how = NFS_UNSTABLE;
- copy->cp_synchronous = 1;
- gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
+ status = nfserrno(-ENOMEM);
+ async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
+ if (!async_copy)
+ goto out;
+ if (!nfs4_init_cp_state(nn, copy)) {
+ kfree(async_copy);
+ goto out;
+ }
+ refcount_set(&async_copy->refcount, 1);
+ memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid,
+ sizeof(copy->cp_stateid));
+ dup_copy_fields(copy, async_copy);
+ async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
+ async_copy, "%s", "copy thread");
+ if (IS_ERR(async_copy->copy_task))
+ goto out_err;
+ spin_lock(&async_copy->cp_clp->async_lock);
+ list_add(&async_copy->copies,
+ &async_copy->cp_clp->async_copies);
+ spin_unlock(&async_copy->cp_clp->async_lock);
+ wake_up_process(async_copy->copy_task);
status = nfs_ok;
- }
-
- fput(src);
- fput(dst);
+ } else
+ status = nfsd4_do_copy(copy, 1);
out:
return status;
+out_err:
+ cleanup_async_copy(async_copy);
+ goto out;
+}
+
+struct nfsd4_copy *
+find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
+{
+ struct nfsd4_copy *copy;
+
+ spin_lock(&clp->async_lock);
+ list_for_each_entry(copy, &clp->async_copies, copies) {
+ if (memcmp(&copy->cp_stateid, stateid, NFS4_STATEID_SIZE))
+ continue;
+ refcount_inc(&copy->refcount);
+ spin_unlock(&clp->async_lock);
+ return copy;
+ }
+ spin_unlock(&clp->async_lock);
+ return NULL;
}
static __be32
@@ -1127,7 +1327,18 @@ nfsd4_offload_cancel(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
- return 0;
+ struct nfsd4_offload_status *os = &u->offload_status;
+ __be32 status = 0;
+ struct nfsd4_copy *copy;
+ struct nfs4_client *clp = cstate->clp;
+
+ copy = find_async_copy(clp, &os->stateid);
+ if (copy)
+ nfsd4_stop_copy(copy);
+ else
+ status = nfserr_bad_stateid;
+
+ return status;
}
static __be32
@@ -1157,7 +1368,19 @@ nfsd4_offload_status(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
- return nfserr_notsupp;
+ struct nfsd4_offload_status *os = &u->offload_status;
+ __be32 status = 0;
+ struct nfsd4_copy *copy;
+ struct nfs4_client *clp = cstate->clp;
+
+ copy = find_async_copy(clp, &os->stateid);
+ if (copy) {
+ os->count = copy->cp_res.wr_bytes_written;
+ nfs4_put_copy(copy);
+ } else
+ status = nfserr_bad_stateid;
+
+ return status;
}
static __be32
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b0ca0efd2875..07a57d024f95 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -713,6 +713,36 @@ out_free:
return NULL;
}
+/*
+ * Create a unique stateid_t to represent each COPY.
+ */
+int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
+{
+ int new_id;
+
+ idr_preload(GFP_KERNEL);
+ spin_lock(&nn->s2s_cp_lock);
+ new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, copy, 0, 0, GFP_NOWAIT);
+ spin_unlock(&nn->s2s_cp_lock);
+ idr_preload_end();
+ if (new_id < 0)
+ return 0;
+ copy->cp_stateid.si_opaque.so_id = new_id;
+ copy->cp_stateid.si_opaque.so_clid.cl_boot = nn->boot_time;
+ copy->cp_stateid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
+ return 1;
+}
+
+void nfs4_free_cp_state(struct nfsd4_copy *copy)
+{
+ struct nfsd_net *nn;
+
+ nn = net_generic(copy->cp_clp->net, nfsd_net_id);
+ spin_lock(&nn->s2s_cp_lock);
+ idr_remove(&nn->s2s_cp_stateids, copy->cp_stateid.si_opaque.so_id);
+ spin_unlock(&nn->s2s_cp_lock);
+}
+
static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
{
struct nfs4_stid *stid;
@@ -1827,6 +1857,8 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name)
#ifdef CONFIG_NFSD_PNFS
INIT_LIST_HEAD(&clp->cl_lo_states);
#endif
+ INIT_LIST_HEAD(&clp->async_copies);
+ spin_lock_init(&clp->async_lock);
spin_lock_init(&clp->cl_lock);
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
return clp;
@@ -1942,6 +1974,7 @@ __destroy_client(struct nfs4_client *clp)
}
}
nfsd4_return_all_client_layouts(clp);
+ nfsd4_shutdown_copy(clp);
nfsd4_shutdown_callback(clp);
if (clp->cl_cb_conn.cb_xprt)
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
@@ -2475,7 +2508,8 @@ static bool client_has_state(struct nfs4_client *clp)
|| !list_empty(&clp->cl_lo_states)
#endif
|| !list_empty(&clp->cl_delegations)
- || !list_empty(&clp->cl_sessions);
+ || !list_empty(&clp->cl_sessions)
+ || !list_empty(&clp->async_copies);
}
__be32
@@ -7161,6 +7195,8 @@ static int nfs4_state_create_net(struct net *net)
INIT_LIST_HEAD(&nn->close_lru);
INIT_LIST_HEAD(&nn->del_recall_lru);
spin_lock_init(&nn->client_lock);
+ spin_lock_init(&nn->s2s_cp_lock);
+ idr_init(&nn->s2s_cp_stateids);
spin_lock_init(&nn->blocked_locks_lock);
INIT_LIST_HEAD(&nn->blocked_locks_lru);
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b78280a8af73..3de42a729093 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4231,15 +4231,27 @@ nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
#endif /* CONFIG_NFSD_PNFS */
static __be32
-nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
+nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
+ struct nfsd42_write_res *write, bool sync)
{
__be32 *p;
+ p = xdr_reserve_space(&resp->xdr, 4);
+ if (!p)
+ return nfserr_resource;
- p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
+ if (sync)
+ *p++ = cpu_to_be32(0);
+ else {
+ __be32 nfserr;
+ *p++ = cpu_to_be32(1);
+ nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
+ if (nfserr)
+ return nfserr;
+ }
+ p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
- *p++ = cpu_to_be32(0);
p = xdr_encode_hyper(p, write->wr_bytes_written);
*p++ = cpu_to_be32(write->wr_stable_how);
p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
@@ -4253,7 +4265,8 @@ nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
{
__be32 *p;
- nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
+ nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
+ copy->cp_synchronous);
if (nfserr)
return nfserr;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7fb9f7c667b1..6384c9b94898 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1242,6 +1242,7 @@ static __net_init int nfsd_init_net(struct net *net)
nn->somebody_reclaimed = false;
nn->clverifier_counter = prandom_u32();
nn->clientid_counter = prandom_u32();
+ nn->s2s_cp_cl_id = nn->clientid_counter++;
atomic_set(&nn->ntf_refcnt, 0);
init_waitqueue_head(&nn->ntf_wq);
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 6e38d9927448..6aacb325b6a0 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -355,6 +355,8 @@ struct nfs4_client {
struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
/* wait here for slots */
struct net *net;
+ struct list_head async_copies; /* list of async copies */
+ spinlock_t async_lock; /* lock for async copies */
};
/* struct nfs4_client_reset
@@ -600,6 +602,7 @@ struct nfsd4_blocked_lock {
struct nfsd4_compound_state;
struct nfsd_net;
+struct nfsd4_copy;
extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
@@ -609,6 +612,8 @@ __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
struct nfs4_stid **s, struct nfsd_net *nn);
struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
void (*sc_free)(struct nfs4_stid *));
+int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
+void nfs4_free_cp_state(struct nfsd4_copy *copy);
void nfs4_unhash_stid(struct nfs4_stid *s);
void nfs4_put_stid(struct nfs4_stid *s);
void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
@@ -627,6 +632,7 @@ extern void nfsd4_run_cb(struct nfsd4_callback *cb);
extern int nfsd4_create_callback_queue(void);
extern void nfsd4_destroy_callback_queue(void);
extern void nfsd4_shutdown_callback(struct nfs4_client *);
+extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
struct nfsd_net *nn);
@@ -634,6 +640,9 @@ extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
struct nfs4_file *find_file(struct knfsd_fh *fh);
void put_nfs4_file(struct nfs4_file *fi);
+extern void nfs4_put_copy(struct nfsd4_copy *copy);
+extern struct nfsd4_copy *
+find_async_copy(struct nfs4_client *clp, stateid_t *staetid);
static inline void get_nfs4_file(struct nfs4_file *fi)
{
refcount_inc(&fi->fi_ref);
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 {