nfs42.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
 4 */
 5
 6#ifndef __LINUX_FS_NFS_NFS4_2_H
 7#define __LINUX_FS_NFS_NFS4_2_H
 8
 9#include <linux/xattr.h>
10
11/*
12 * FIXME:  four LAYOUTSTATS calls per compound at most! Do we need to support
13 * more? Need to consider not to pre-alloc too much for a compound.
14 */
15#define PNFS_LAYOUTSTATS_MAXDEV (4)
16#define READ_PLUS_SCRATCH_SIZE (16)
17
18/* nfs4.2proc.c */
19#ifdef CONFIG_NFS_V4_2
20int nfs42_proc_allocate(struct file *, loff_t, loff_t);
21ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t,
22			struct nl4_server *, nfs4_stateid *, bool);
23int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
24int nfs42_proc_zero_range(struct file *, loff_t, loff_t);
25loff_t nfs42_proc_llseek(struct file *, loff_t, int);
26int nfs42_proc_layoutstats_generic(struct nfs_server *,
27				   struct nfs42_layoutstat_data *);
28int nfs42_proc_clone(struct file *, struct file *, loff_t, loff_t, loff_t);
29int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
30			   const struct nfs42_layout_error *errors,
31			   size_t n);
32int nfs42_proc_copy_notify(struct file *, struct file *,
33			   struct nfs42_copy_notify_res *);
34static inline bool nfs42_files_from_same_server(struct file *in,
35						struct file *out)
36{
37	struct nfs_client *c_in = (NFS_SERVER(file_inode(in)))->nfs_client;
38	struct nfs_client *c_out = (NFS_SERVER(file_inode(out)))->nfs_client;
39
40	return nfs4_check_serverowner_major_id(c_in->cl_serverowner,
41					       c_out->cl_serverowner);
42}
43
44ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
45			    void *buf, size_t buflen);
46int nfs42_proc_setxattr(struct inode *inode, const char *name,
47			const void *buf, size_t buflen, int flags);
48ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
49			       size_t buflen, u64 *cookiep, bool *eofp);
50int nfs42_proc_removexattr(struct inode *inode, const char *name);
51
52/*
53 * Maximum XDR buffer size needed for a listxattr buffer of buflen size.
54 *
55 * The upper boundary is a buffer with all 1-byte sized attribute names.
56 * They would be 7 bytes long in the eventual buffer ("user.x\0"), and
57 * 8 bytes long XDR-encoded.
58 *
59 * Include the trailing eof word as well and make the result a multiple
60 * of 4 bytes.
61 */
62static inline u32 nfs42_listxattr_xdrsize(u32 buflen)
63{
64	u32 size = 8 * buflen / (XATTR_USER_PREFIX_LEN + 2) + 4;
65
66	return (size + 3) & ~3;
67}
68#endif /* CONFIG_NFS_V4_2 */
69#endif /* __LINUX_FS_NFS_NFS4_2_H */