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NFS: handle source server reboot
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When the source server reboots after a server-to-server copy was
issued, we need to retry the copy from COPY_NOTIFY. We need to
detect that the source server rebooted and there is a copy waiting
on a destination server and wake it up.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
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@olgakorn1
olgakorn1 authored and Olga Kornievskaia committed Oct 9, 2019
1 parent fefa1a8 commit 0e65a32
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Showing 5 changed files with 75 additions and 27 deletions.
68 changes: 47 additions & 21 deletions fs/nfs/nfs42proc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -153,22 +153,26 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
}

static int handle_async_copy(struct nfs42_copy_res *res,
struct nfs_server *server,
struct nfs_server *dst_server,
struct nfs_server *src_server,
struct file *src,
struct file *dst,
nfs4_stateid *src_stateid)
nfs4_stateid *src_stateid,
bool *restart)
{
struct nfs4_copy_state *copy, *tmp_copy;
int status = NFS4_OK;
bool found_pending = false;
struct nfs_open_context *ctx = nfs_file_open_context(dst);
struct nfs_open_context *dst_ctx = nfs_file_open_context(dst);
struct nfs_open_context *src_ctx = nfs_file_open_context(src);

copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy)
return -ENOMEM;

spin_lock(&server->nfs_client->cl_lock);
list_for_each_entry(tmp_copy, &server->nfs_client->pending_cb_stateids,
spin_lock(&dst_server->nfs_client->cl_lock);
list_for_each_entry(tmp_copy,
&dst_server->nfs_client->pending_cb_stateids,
copies) {
if (memcmp(&res->write_res.stateid, &tmp_copy->stateid,
NFS4_STATEID_SIZE))
Expand All @@ -178,27 +182,40 @@ static int handle_async_copy(struct nfs42_copy_res *res,
break;
}
if (found_pending) {
spin_unlock(&server->nfs_client->cl_lock);
spin_unlock(&dst_server->nfs_client->cl_lock);
kfree(copy);
copy = tmp_copy;
goto out;
}

memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
init_completion(&copy->completion);
copy->parent_state = ctx->state;
copy->parent_dst_state = dst_ctx->state;
copy->parent_src_state = src_ctx->state;

list_add_tail(&copy->copies, &dst_server->ss_copies);
spin_unlock(&dst_server->nfs_client->cl_lock);

list_add_tail(&copy->copies, &server->ss_copies);
spin_unlock(&server->nfs_client->cl_lock);
if (dst_server != src_server) {
spin_lock(&src_server->nfs_client->cl_lock);
list_add_tail(&copy->src_copies, &src_server->ss_copies);
spin_unlock(&src_server->nfs_client->cl_lock);
}

status = wait_for_completion_interruptible(&copy->completion);
spin_lock(&server->nfs_client->cl_lock);
spin_lock(&dst_server->nfs_client->cl_lock);
list_del_init(&copy->copies);
spin_unlock(&server->nfs_client->cl_lock);
spin_unlock(&dst_server->nfs_client->cl_lock);
if (dst_server != src_server) {
spin_lock(&src_server->nfs_client->cl_lock);
list_del_init(&copy->src_copies);
spin_unlock(&src_server->nfs_client->cl_lock);
}
if (status == -ERESTARTSYS) {
goto out_cancel;
} else if (copy->flags) {
} else if (copy->flags || copy->error == NFS4ERR_PARTNER_NO_AUTH) {
status = -EAGAIN;
*restart = true;
goto out_cancel;
}
out:
Expand Down Expand Up @@ -247,15 +264,18 @@ static ssize_t _nfs42_proc_copy(struct file *src,
struct nfs42_copy_args *args,
struct nfs42_copy_res *res,
struct nl4_server *nss,
nfs4_stateid *cnr_stateid)
nfs4_stateid *cnr_stateid,
bool *restart)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
.rpc_argp = args,
.rpc_resp = res,
};
struct inode *dst_inode = file_inode(dst);
struct nfs_server *server = NFS_SERVER(dst_inode);
struct inode *src_inode = file_inode(src);
struct nfs_server *dst_server = NFS_SERVER(dst_inode);
struct nfs_server *src_server = NFS_SERVER(src_inode);
loff_t pos_src = args->src_pos;
loff_t pos_dst = args->dst_pos;
size_t count = args->count;
Expand Down Expand Up @@ -291,13 +311,15 @@ static ssize_t _nfs42_proc_copy(struct file *src,
if (!res->commit_res.verf)
return -ENOMEM;
}
set_bit(NFS_CLNT_SRC_SSC_COPY_STATE,
&src_lock->open_context->state->flags);
set_bit(NFS_CLNT_DST_SSC_COPY_STATE,
&dst_lock->open_context->state->flags);

status = nfs4_call_sync(server->client, server, &msg,
status = nfs4_call_sync(dst_server->client, dst_server, &msg,
&args->seq_args, &res->seq_res, 0);
if (status == -ENOTSUPP)
server->caps &= ~NFS_CAP_COPY;
dst_server->caps &= ~NFS_CAP_COPY;
if (status)
goto out;

Expand All @@ -309,8 +331,8 @@ static ssize_t _nfs42_proc_copy(struct file *src,
}

if (!res->synchronous) {
status = handle_async_copy(res, server, src, dst,
&args->src_stateid);
status = handle_async_copy(res, dst_server, src_server, src,
dst, &args->src_stateid, restart);
if (status)
return status;
}
Expand Down Expand Up @@ -358,6 +380,7 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
.stateid = &args.dst_stateid,
};
ssize_t err, err2;
bool restart = false;

src_lock = nfs_get_lock_context(nfs_file_open_context(src));
if (IS_ERR(src_lock))
Expand All @@ -378,7 +401,7 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
err = _nfs42_proc_copy(src, src_lock,
dst, dst_lock,
&args, &res,
nss, cnr_stateid);
nss, cnr_stateid, &restart);
inode_unlock(file_inode(dst));

if (err >= 0)
Expand All @@ -388,8 +411,11 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
err = -EOPNOTSUPP;
break;
} else if (err == -EAGAIN) {
dst_exception.retry = 1;
continue;
if (!restart) {
dst_exception.retry = 1;
continue;
}
break;
} else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) {
args.sync = true;
dst_exception.retry = 1;
Expand Down
1 change: 1 addition & 0 deletions fs/nfs/nfs4_fs.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,7 @@ enum {
NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */
#ifdef CONFIG_NFS_V4_2
NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/
NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/
NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */
#endif /* CONFIG_NFS_V4_2 */
};
Expand Down
3 changes: 3 additions & 0 deletions fs/nfs/nfs4file.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,7 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
return -EOPNOTSUPP;
if (file_inode(file_in) == file_inode(file_out))
return -EOPNOTSUPP;
retry:
if (!nfs42_files_from_same_server(file_in, file_out)) {
cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
GFP_NOFS);
Expand All @@ -164,6 +165,8 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
nss, cnrs);
out:
kfree(cn_resp);
if (ret == -EAGAIN)
goto retry;
return ret;
}

Expand Down
26 changes: 21 additions & 5 deletions fs/nfs/nfs4state.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1556,16 +1556,32 @@ static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state
{
struct nfs4_copy_state *copy;

if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags))
if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
!test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
return;

spin_lock(&sp->so_server->nfs_client->cl_lock);
list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
if (!nfs4_stateid_match_other(&state->stateid, &copy->parent_state->stateid))
continue;
if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
!nfs4_stateid_match_other(&state->stateid,
&copy->parent_dst_state->stateid)))
continue;
copy->flags = 1;
complete(&copy->completion);
break;
if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
&state->flags)) {
clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
complete(&copy->completion);
}
}
list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
!nfs4_stateid_match_other(&state->stateid,
&copy->parent_src_state->stateid)))
continue;
copy->flags = 1;
if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
&state->flags))
complete(&copy->completion);
}
spin_unlock(&sp->so_server->nfs_client->cl_lock);
}
Expand Down
4 changes: 3 additions & 1 deletion include/linux/nfs_fs.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -189,13 +189,15 @@ struct nfs_inode {

struct nfs4_copy_state {
struct list_head copies;
struct list_head src_copies;
nfs4_stateid stateid;
struct completion completion;
uint64_t count;
struct nfs_writeverf verf;
int error;
int flags;
struct nfs4_state *parent_state;
struct nfs4_state *parent_src_state;
struct nfs4_state *parent_dst_state;
};

/*
Expand Down

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