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
20 int nfs42_proc_allocate(struct file *, loff_t, loff_t);
21 ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t,
22 			struct nl4_server *, nfs4_stateid *, bool);
23 int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
24 loff_t nfs42_proc_llseek(struct file *, loff_t, int);
25 int nfs42_proc_layoutstats_generic(struct nfs_server *,
26 				   struct nfs42_layoutstat_data *);
27 int nfs42_proc_clone(struct file *, struct file *, loff_t, loff_t, loff_t);
28 int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
29 			   const struct nfs42_layout_error *errors,
30 			   size_t n);
31 int nfs42_proc_copy_notify(struct file *, struct file *,
32 			   struct nfs42_copy_notify_res *);
nfs42_files_from_same_server(struct file * in,struct file * out)33 static inline bool nfs42_files_from_same_server(struct file *in,
34 						struct file *out)
35 {
36 	struct nfs_client *c_in = (NFS_SERVER(file_inode(in)))->nfs_client;
37 	struct nfs_client *c_out = (NFS_SERVER(file_inode(out)))->nfs_client;
38 
39 	return nfs4_check_serverowner_major_id(c_in->cl_serverowner,
40 					       c_out->cl_serverowner);
41 }
42 
43 ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
44 			    void *buf, size_t buflen);
45 int nfs42_proc_setxattr(struct inode *inode, const char *name,
46 			const void *buf, size_t buflen, int flags);
47 ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
48 			       size_t buflen, u64 *cookiep, bool *eofp);
49 int nfs42_proc_removexattr(struct inode *inode, const char *name);
50 
51 /*
52  * Maximum XDR buffer size needed for a listxattr buffer of buflen size.
53  *
54  * The upper boundary is a buffer with all 1-byte sized attribute names.
55  * They would be 7 bytes long in the eventual buffer ("user.x\0"), and
56  * 8 bytes long XDR-encoded.
57  *
58  * Include the trailing eof word as well and make the result a multiple
59  * of 4 bytes.
60  */
nfs42_listxattr_xdrsize(u32 buflen)61 static inline u32 nfs42_listxattr_xdrsize(u32 buflen)
62 {
63 	u32 size = 8 * buflen / (XATTR_USER_PREFIX_LEN + 2) + 4;
64 
65 	return (size + 3) & ~3;
66 }
67 #endif /* CONFIG_NFS_V4_2 */
68 #endif /* __LINUX_FS_NFS_NFS4_2_H */
69