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Commit e5341f3a authored by Peng Tao's avatar Peng Tao Committed by Trond Myklebust
Browse files

nfs42: add CLONE proc functions 



Signed-off-by: default avatarPeng Tao <tao.peng@primarydata.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 36022770

fs/nfs/nfs42.h

+1 −0
Original line number Diff line number Diff line
@@ -17,5 +17,6 @@ int nfs42_proc_deallocate(struct file *, loff_t, loff_t); 
loff_t nfs42_proc_llseek(struct file *, loff_t, int);

int nfs42_proc_layoutstats_generic(struct nfs_server *,

				   struct nfs42_layoutstat_data *);

int nfs42_proc_clone(struct file *, struct file *, loff_t, loff_t, loff_t);



#endif /* __LINUX_FS_NFS_NFS4_2_H */

fs/nfs/nfs42proc.c

+71 −0
Original line number Diff line number Diff line
@@ -271,3 +271,74 @@ int nfs42_proc_layoutstats_generic(struct nfs_server *server, 
		return PTR_ERR(task);

	return 0;

}



static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,

			     struct file *dst_f, loff_t src_offset,

			     loff_t dst_offset, loff_t count)

{

	struct inode *src_inode = file_inode(src_f);

	struct inode *dst_inode = file_inode(dst_f);

	struct nfs_server *server = NFS_SERVER(dst_inode);

	struct nfs42_clone_args args = {

		.src_fh = NFS_FH(src_inode),

		.dst_fh = NFS_FH(dst_inode),

		.src_offset = src_offset,

		.dst_offset = dst_offset,

		.dst_bitmask = server->cache_consistency_bitmask,

	};

	struct nfs42_clone_res res = {

		.server	= server,

	};

	int status;



	msg->rpc_argp = &args;

	msg->rpc_resp = &res;



	status = nfs42_set_rw_stateid(&args.src_stateid, src_f, FMODE_READ);

	if (status)

		return status;



	status = nfs42_set_rw_stateid(&args.dst_stateid, dst_f, FMODE_WRITE);

	if (status)

		return status;



	res.dst_fattr = nfs_alloc_fattr();

	if (!res.dst_fattr)

		return -ENOMEM;



	status = nfs4_call_sync(server->client, server, msg,

				&args.seq_args, &res.seq_res, 0);

	if (status == 0)

		status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);



	kfree(res.dst_fattr);

	return status;

}



int nfs42_proc_clone(struct file *src_f, struct file *dst_f,

		     loff_t src_offset, loff_t dst_offset, loff_t count)

{

	struct rpc_message msg = {

		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],

	};

	struct inode *inode = file_inode(src_f);

	struct nfs_server *server = NFS_SERVER(file_inode(src_f));

	struct nfs4_exception exception = { };

	int err;



	if (!nfs_server_capable(inode, NFS_CAP_CLONE))

		return -EOPNOTSUPP;



	do {

		err = _nfs42_proc_clone(&msg, src_f, dst_f, src_offset,

					dst_offset, count);

		if (err == -ENOTSUPP || err == -EOPNOTSUPP) {

			NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;

			return -EOPNOTSUPP;

		}

		err = nfs4_handle_exception(server, err, &exception);

	} while (exception.retry);



	return err;



}

fs/nfs/nfs4proc.c

+2 −1
Original line number Diff line number Diff line
@@ -8729,7 +8729,8 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 
		| NFS_CAP_ALLOCATE

		| NFS_CAP_DEALLOCATE

		| NFS_CAP_SEEK

		| NFS_CAP_LAYOUTSTATS,

		| NFS_CAP_LAYOUTSTATS

		| NFS_CAP_CLONE,

	.init_client = nfs41_init_client,

	.shutdown_client = nfs41_shutdown_client,

	.match_stateid = nfs41_match_stateid,

include/linux/nfs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -243,5 +243,6 @@ struct nfs_server { 
#define NFS_CAP_ALLOCATE	(1U << 20)

#define NFS_CAP_DEALLOCATE	(1U << 21)

#define NFS_CAP_LAYOUTSTATS	(1U << 22)

#define NFS_CAP_CLONE		(1U << 23)



#endif