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 __be32          nfsd4_clone_file_range(struct file *, u64, struct file *,
  60                         u64, u64);
  61 #endif /* CONFIG_NFSD_V4 */
  62 __be32          nfsd_create(struct svc_rqst *, struct svc_fh *,
  63                                 char *name, int len, struct iattr *attrs,
  64                                 int type, dev_t rdev, struct svc_fh *res);
  65 #ifdef CONFIG_NFSD_V3
  66 __be32          nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
  67 __be32          do_nfsd_create(struct svc_rqst *, struct svc_fh *,
  68                                 char *name, int len, struct iattr *attrs,
  69                                 struct svc_fh *res, int createmode,
  70                                 u32 *verifier, bool *truncp, bool *created);
  71 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
  72                                 loff_t, unsigned long);
  73 #endif /* CONFIG_NFSD_V3 */
  74 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
  75                                 int, struct file **);
  76 struct raparms;
  77 __be32          nfsd_splice_read(struct svc_rqst *,
  78                                 struct file *, loff_t, unsigned long *);
  79 __be32          nfsd_readv(struct file *, loff_t, struct kvec *, int,
  80                                 unsigned long *);
  81 __be32          nfsd_read(struct svc_rqst *, struct svc_fh *,
  82                                 loff_t, struct kvec *, int, unsigned long *);
  83 __be32          nfsd_write(struct svc_rqst *, struct svc_fh *,struct file *,
  84                                 loff_t, struct kvec *,int, unsigned long *, int *);
  85 __be32          nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
  86                                 struct file *file, loff_t offset,
  87                                 struct kvec *vec, int vlen, unsigned long *cnt,
  88                                 int *stablep);
  89 __be32          nfsd_readlink(struct svc_rqst *, struct svc_fh *,
  90                                 char *, int *);
  91 __be32          nfsd_symlink(struct svc_rqst *, struct svc_fh *,
  92                                 char *name, int len, char *path,
  93                                 struct svc_fh *res);
  94 __be32          nfsd_link(struct svc_rqst *, struct svc_fh *,
  95                                 char *, int, struct svc_fh *);
  96 __be32          nfsd_rename(struct svc_rqst *,
  97                                 struct svc_fh *, char *, int,
  98                                 struct svc_fh *, char *, int);
  99 __be32          nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
 100                                 char *name, int len);
 101 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
 102                              loff_t *, struct readdir_cd *, nfsd_filldir_t);
 103 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
 104                                 struct kstatfs *, int access);
 105
 106 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
 107                                 struct dentry *, int);
 108
 109 struct raparms *nfsd_init_raparms(struct file *file);
 110 void            nfsd_put_raparams(struct file *file, struct raparms *ra);
 111
 112 static inline int fh_want_write(struct svc_fh *fh)
 113 {
 114         int ret = mnt_want_write(fh->fh_export->ex_path.mnt);
 115
 116         if (!ret)
 117                 fh->fh_want_write = true;
 118         return ret;
 119 }
 120
 121 static inline void fh_drop_write(struct svc_fh *fh)
 122 {
 123         if (fh->fh_want_write) {
 124                 fh->fh_want_write = false;
 125                 mnt_drop_write(fh->fh_export->ex_path.mnt);
 126         }
 127 }
 128
 129 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
 130 {
 131         struct path p = {.mnt = fh->fh_export->ex_path.mnt,
 132                          .dentry = fh->fh_dentry};
 133         return nfserrno(vfs_getattr(&p, stat));
 134 }
 135
 136 static inline int nfsd_create_is_exclusive(int createmode)
 137 {
 138         return createmode == NFS3_CREATE_EXCLUSIVE
 139                || createmode == NFS4_CREATE_EXCLUSIVE4_1;
 140 }
 141
 142 static inline bool nfsd_eof_on_read(long requested, long read,
 143                                 loff_t offset, loff_t size)
 144 {
 145         /* We assume a short read means eof: */
 146         if (requested > read)
 147                 return true;
 148         /*
 149          * A non-short read might also reach end of file.  The spec
 150          * still requires us to set eof in that case.
 151          *
 152          * Further operations may have modified the file size since
 153          * the read, so the following check is not atomic with the read.
 154          * We've only seen that cause a problem for a client in the case
 155          * where the read returned a count of 0 without setting eof.
 156          * That case was fixed by the addition of the above check.
 157          */
 158         return (offset + read >= size);
 159 }
 160
 161 #endif /* LINUX_NFSD_VFS_H */