include/uapi/linux/nfsd/export.h

   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 */