1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * include/linux/nfsd/export.h 4 * 5 * Public declarations for NFS exports. The definitions for the 6 * syscall interface are in nfsctl.h 7 * 8 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de> 9 */ 10 11 #ifndef _UAPINFSD_EXPORT_H 12 #define _UAPINFSD_EXPORT_H 13 14 # include <linux/types.h> 15 16 /* 17 * Important limits for the exports stuff. 18 */ 19 #define NFSCLNT_IDMAX 1024 20 #define NFSCLNT_ADDRMAX 16 21 #define NFSCLNT_KEYMAX 32 22 23 /* 24 * Export flags. 25 * 26 * Please update the expflags[] array in fs/nfsd/export.c when adding 27 * a new flag. 28 */ 29 #define NFSEXP_READONLY 0x0001 30 #define NFSEXP_INSECURE_PORT 0x0002 31 #define NFSEXP_ROOTSQUASH 0x0004 32 #define NFSEXP_ALLSQUASH 0x0008 33 #define NFSEXP_ASYNC 0x0010 34 #define NFSEXP_GATHERED_WRITES 0x0020 35 #define NFSEXP_NOREADDIRPLUS 0x0040 36 #define NFSEXP_SECURITY_LABEL 0x0080 37 /* 0x100 currently unused */ 38 #define NFSEXP_NOHIDE 0x0200 39 #define NFSEXP_NOSUBTREECHECK 0x0400 40 #define NFSEXP_NOAUTHNLM 0x0800 /* Don't authenticate NLM requests - just trust */ 41 #define NFSEXP_MSNFS 0x1000 /* do silly things that MS clients expect; no longer supported */ 42 #define NFSEXP_FSID 0x2000 43 #define NFSEXP_CROSSMOUNT 0x4000 44 #define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */ 45 /* 46 * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4 47 * clients, and only to the single directory that is the root of the 48 * export; further lookup and readdir operations are treated as if every 49 * subdirectory was a mountpoint, and ignored if they are not themselves 50 * exported. This is used by nfsd and mountd to construct the NFSv4 51 * pseudofilesystem, which provides access only to paths leading to each 52 * exported filesystem. 53 */ 54 #define NFSEXP_V4ROOT 0x10000 55 #define NFSEXP_PNFS 0x20000 56 57 /* All flags that we claim to support. (Note we don't support NOACL.) */ 58 #define NFSEXP_ALLFLAGS 0x3FEFF 59 60 /* The flags that may vary depending on security flavor: */ 61 #define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \ 62 | NFSEXP_ALLSQUASH \ 63 | NFSEXP_INSECURE_PORT) 64 65 66 #endif /* _UAPINFSD_EXPORT_H */ 67