fs/nfsd/vfs.h

   1 /*
   2  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   3  */
   4
   5 #ifndef LINUX_NFSD_VFS_H
   6 #define LINUX_NFSD_VFS_H
   7
   8 #include "nfsfh.h"
   9 #include "nfsd.h"
  10
  11 /*
  12  * Flags for nfsd_permission
  13  */
  14 #define NFSD_MAY_NOP                    0
  15 #define NFSD_MAY_EXEC                   0x001 /* == MAY_EXEC */
  16 #define NFSD_MAY_WRITE                  0x002 /* == MAY_WRITE */
  17 #define NFSD_MAY_READ                   0x004 /* == MAY_READ */
  18 #define NFSD_MAY_SATTR                  0x008
  19 #define NFSD_MAY_TRUNC                  0x010
  20 #define NFSD_MAY_LOCK                   0x020
  21 #define NFSD_MAY_MASK                   0x03f
  22
  23 /* extra hints to permission and open routines: */
  24 #define NFSD_MAY_OWNER_OVERRIDE         0x040
  25 #define NFSD_MAY_LOCAL_ACCESS           0x080 /* for device special files */
  26 #define NFSD_MAY_BYPASS_GSS_ON_ROOT     0x100
  27 #define NFSD_MAY_NOT_BREAK_LEASE        0x200
  28 #define NFSD_MAY_BYPASS_GSS             0x400
  29 #define NFSD_MAY_READ_IF_EXEC           0x800
  30
  31 #define NFSD_MAY_64BIT_COOKIE           0x1000 /* 64 bit readdir cookies for >= NFSv3 */
  32
  33 #define NFSD_MAY_CREATE         (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
  34 #define NFSD_MAY_REMOVE         (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
  35
  36 /*
  37  * Callback function for readdir
  38  */
  39 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
  40
  41 /* nfsd/vfs.c */
  42 int             nfsd_racache_init(int);
  43 void            nfsd_racache_shutdown(void);
  44 int             nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
  45                                 struct svc_export **expp);
  46 __be32          nfsd_lookup(struct svc_rqst *, struct svc_fh *,
  47                                 const char *, unsigned int, struct svc_fh *);
  48 __be32           nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
  49                                 const char *, unsigned int,
  50                                 struct svc_export **, struct dentry **);
  51 __be32          nfsd_setattr(struct svc_rqst *, struct svc_fh *,
  52                                 struct iattr *, int, time_t);
  53 int nfsd_mountpoint(struct dentry *, struct svc_export *);
  54 #ifdef CONFIG_NFSD_V4
  55 __be32          nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
  56                     struct xdr_netobj *);
  57 __be32          nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
  58                                     struct file *, loff_t, loff_t, int);
  59 #endif /* CONFIG_NFSD_V4 */
  60 __be32          nfsd_create(struct svc_rqst *, struct svc_fh *,
  61                                 char *name, int len, struct iattr *attrs,
  62                                 int type, dev_t rdev, struct svc_fh *res);
  63 #ifdef CONFIG_NFSD_V3
  64 __be32          nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
  65 __be32          do_nfsd_create(struct svc_rqst *, struct svc_fh *,
  66                                 char *name, int len, struct iattr *attrs,
  67                                 struct svc_fh *res, int createmode,
  68                                 u32 *verifier, bool *truncp, bool *created);
  69 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
  70                                 loff_t, unsigned long);
  71 #endif /* CONFIG_NFSD_V3 */
  72 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
  73                                 int, struct file **);
  74 struct raparms;
  75 __be32          nfsd_splice_read(struct svc_rqst *,
  76                                 struct file *, loff_t, unsigned long *);
  77 __be32          nfsd_readv(struct file *, loff_t, struct kvec *, int,
  78                                 unsigned long *);
  79 __be32          nfsd_read(struct svc_rqst *, struct svc_fh *,
  80                                 loff_t, struct kvec *, int, unsigned long *);
  81 __be32          nfsd_write(struct svc_rqst *, struct svc_fh *,struct file *,
  82                                 loff_t, struct kvec *,int, unsigned long *, int *);
  83 __be32          nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
  84                                 struct file *file, loff_t offset,
  85                                 struct kvec *vec, int vlen, unsigned long *cnt,
  86                                 int *stablep);
  87 __be32          nfsd_readlink(struct svc_rqst *, struct svc_fh *,
  88                                 char *, int *);
  89 __be32          nfsd_symlink(struct svc_rqst *, struct svc_fh *,
  90                                 char *name, int len, char *path,
  91                                 struct svc_fh *res);
  92 __be32          nfsd_link(struct svc_rqst *, struct svc_fh *,
  93                                 char *, int, struct svc_fh *);
  94 __be32          nfsd_rename(struct svc_rqst *,
  95                                 struct svc_fh *, char *, int,
  96                                 struct svc_fh *, char *, int);
  97 __be32          nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
  98                                 char *name, int len);
  99 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
 100                              loff_t *, struct readdir_cd *, nfsd_filldir_t);
 101 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
 102                                 struct kstatfs *, int access);
 103
 104 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
 105                                 struct dentry *, int);
 106
 107 struct raparms *nfsd_init_raparms(struct file *file);
 108 void            nfsd_put_raparams(struct file *file, struct raparms *ra);
 109
 110 static inline int fh_want_write(struct svc_fh *fh)
 111 {
 112         int ret;
 113
 114         if (fh->fh_want_write)
 115                 return 0;
 116         ret = mnt_want_write(fh->fh_export->ex_path.mnt);
 117         if (!ret)
 118                 fh->fh_want_write = true;
 119         return ret;
 120 }
 121
 122 static inline void fh_drop_write(struct svc_fh *fh)
 123 {
 124         if (fh->fh_want_write) {
 125                 fh->fh_want_write = false;
 126                 mnt_drop_write(fh->fh_export->ex_path.mnt);
 127         }
 128 }
 129
 130 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
 131 {
 132         struct path p = {.mnt = fh->fh_export->ex_path.mnt,
 133                          .dentry = fh->fh_dentry};
 134         return nfserrno(vfs_getattr(&p, stat));
 135 }
 136
 137 static inline int nfsd_create_is_exclusive(int createmode)
 138 {
 139         return createmode == NFS3_CREATE_EXCLUSIVE
 140                || createmode == NFS4_CREATE_EXCLUSIVE4_1;
 141 }
 142
 143 #endif /* LINUX_NFSD_VFS_H */