xref: /openbmc/linux/fs/nfs/nfs42.h (revision 5ee9cd065836e5934710ca35653bce7905add20b)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
 */

#ifndef __LINUX_FS_NFS_NFS4_2_H
#define __LINUX_FS_NFS_NFS4_2_H

#include <linux/xattr.h>

/*
 * FIXME:  four LAYOUTSTATS calls per compound at most! Do we need to support
 * more? Need to consider not to pre-alloc too much for a compound.
 */
#define PNFS_LAYOUTSTATS_MAXDEV (4)
#define READ_PLUS_SCRATCH_SIZE (16)

/* nfs4.2proc.c */
#ifdef CONFIG_NFS_V4_2
int nfs42_proc_allocate(struct file *, loff_t, loff_t);
ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t,
			struct nl4_server *, nfs4_stateid *, bool);
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);
int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
			   const struct nfs42_layout_error *errors,
			   size_t n);
int nfs42_proc_copy_notify(struct file *, struct file *,
			   struct nfs42_copy_notify_res *);
static inline bool nfs42_files_from_same_server(struct file *in,
						struct file *out)
{
	struct nfs_client *c_in = (NFS_SERVER(file_inode(in)))->nfs_client;
	struct nfs_client *c_out = (NFS_SERVER(file_inode(out)))->nfs_client;

	return nfs4_check_serverowner_major_id(c_in->cl_serverowner,
					       c_out->cl_serverowner);
}

ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
			    void *buf, size_t buflen);
int nfs42_proc_setxattr(struct inode *inode, const char *name,
			const void *buf, size_t buflen, int flags);
ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
			       size_t buflen, u64 *cookiep, bool *eofp);
int nfs42_proc_removexattr(struct inode *inode, const char *name);

/*
 * Maximum XDR buffer size needed for a listxattr buffer of buflen size.
 *
 * The upper boundary is a buffer with all 1-byte sized attribute names.
 * They would be 7 bytes long in the eventual buffer ("user.x\0"), and
 * 8 bytes long XDR-encoded.
 *
 * Include the trailing eof word as well and make the result a multiple
 * of 4 bytes.
 */
static inline u32 nfs42_listxattr_xdrsize(u32 buflen)
{
	u32 size = 8 * buflen / (XATTR_USER_PREFIX_LEN + 2) + 4;

	return (size + 3) & ~3;
}
#endif /* CONFIG_NFS_V4_2 */
#endif /* __LINUX_FS_NFS_NFS4_2_H */