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Linux/fs/nfsd/vfs.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
  4  */
  5 
  6 #ifndef LINUX_NFSD_VFS_H
  7 #define LINUX_NFSD_VFS_H
  8 
  9 #include "nfsfh.h"
 10 #include "nfsd.h"
 11 
 12 /*
 13  * Flags for nfsd_permission
 14  */
 15 #define NFSD_MAY_NOP                    0
 16 #define NFSD_MAY_EXEC                   0x001 /* == MAY_EXEC */
 17 #define NFSD_MAY_WRITE                  0x002 /* == MAY_WRITE */
 18 #define NFSD_MAY_READ                   0x004 /* == MAY_READ */
 19 #define NFSD_MAY_SATTR                  0x008
 20 #define NFSD_MAY_TRUNC                  0x010
 21 #define NFSD_MAY_LOCK                   0x020
 22 #define NFSD_MAY_MASK                   0x03f
 23 
 24 /* extra hints to permission and open routines: */
 25 #define NFSD_MAY_OWNER_OVERRIDE         0x040
 26 #define NFSD_MAY_LOCAL_ACCESS           0x080 /* for device special files */
 27 #define NFSD_MAY_BYPASS_GSS_ON_ROOT     0x100
 28 #define NFSD_MAY_NOT_BREAK_LEASE        0x200
 29 #define NFSD_MAY_BYPASS_GSS             0x400
 30 #define NFSD_MAY_READ_IF_EXEC           0x800
 31 
 32 #define NFSD_MAY_64BIT_COOKIE           0x1000 /* 64 bit readdir cookies for >= NFSv3 */
 33 
 34 #define NFSD_MAY_CREATE         (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
 35 #define NFSD_MAY_REMOVE         (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
 36 
 37 /*
 38  * Callback function for readdir
 39  */
 40 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
 41 
 42 /* nfsd/vfs.c */
 43 int             nfsd_racache_init(int);
 44 void            nfsd_racache_shutdown(void);
 45 int             nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
 46                                 struct svc_export **expp);
 47 __be32          nfsd_lookup(struct svc_rqst *, struct svc_fh *,
 48                                 const char *, unsigned int, struct svc_fh *);
 49 __be32           nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
 50                                 const char *, unsigned int,
 51                                 struct svc_export **, struct dentry **);
 52 __be32          nfsd_setattr(struct svc_rqst *, struct svc_fh *,
 53                                 struct iattr *, int, time_t);
 54 int nfsd_mountpoint(struct dentry *, struct svc_export *);
 55 #ifdef CONFIG_NFSD_V4
 56 __be32          nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
 57                     struct xdr_netobj *);
 58 __be32          nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
 59                                     struct file *, loff_t, loff_t, int);
 60 __be32          nfsd4_clone_file_range(struct file *, u64, struct file *,
 61                         u64, u64);
 62 #endif /* CONFIG_NFSD_V4 */
 63 __be32          nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
 64                                 char *name, int len, struct iattr *attrs,
 65                                 int type, dev_t rdev, struct svc_fh *res);
 66 __be32          nfsd_create(struct svc_rqst *, struct svc_fh *,
 67                                 char *name, int len, struct iattr *attrs,
 68                                 int type, dev_t rdev, struct svc_fh *res);
 69 #ifdef CONFIG_NFSD_V3
 70 __be32          nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
 71 __be32          do_nfsd_create(struct svc_rqst *, struct svc_fh *,
 72                                 char *name, int len, struct iattr *attrs,
 73                                 struct svc_fh *res, int createmode,
 74                                 u32 *verifier, bool *truncp, bool *created);
 75 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
 76                                 loff_t, unsigned long);
 77 #endif /* CONFIG_NFSD_V3 */
 78 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
 79                                 int, struct file **);
 80 struct raparms;
 81 __be32          nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
 82                                 struct file *file, loff_t offset,
 83                                 unsigned long *count);
 84 __be32          nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
 85                                 struct file *file, loff_t offset,
 86                                 struct kvec *vec, int vlen,
 87                                 unsigned long *count);
 88 __be32          nfsd_read(struct svc_rqst *, struct svc_fh *,
 89                                 loff_t, struct kvec *, int, unsigned long *);
 90 __be32          nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
 91                                 struct kvec *, int, unsigned long *, int);
 92 __be32          nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
 93                                 struct file *file, loff_t offset,
 94                                 struct kvec *vec, int vlen, unsigned long *cnt,
 95                                 int stable);
 96 __be32          nfsd_readlink(struct svc_rqst *, struct svc_fh *,
 97                                 char *, int *);
 98 __be32          nfsd_symlink(struct svc_rqst *, struct svc_fh *,
 99                                 char *name, int len, char *path,
100                                 struct svc_fh *res);
101 __be32          nfsd_link(struct svc_rqst *, struct svc_fh *,
102                                 char *, int, struct svc_fh *);
103 ssize_t         nfsd_copy_file_range(struct file *, u64,
104                                      struct file *, u64, u64);
105 __be32          nfsd_rename(struct svc_rqst *,
106                                 struct svc_fh *, char *, int,
107                                 struct svc_fh *, char *, int);
108 __be32          nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
109                                 char *name, int len);
110 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
111                              loff_t *, struct readdir_cd *, nfsd_filldir_t);
112 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
113                                 struct kstatfs *, int access);
114 
115 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
116                                 struct dentry *, int);
117 
118 struct raparms *nfsd_init_raparms(struct file *file);
119 void            nfsd_put_raparams(struct file *file, struct raparms *ra);
120 
121 static inline int fh_want_write(struct svc_fh *fh)
122 {
123         int ret = mnt_want_write(fh->fh_export->ex_path.mnt);
124 
125         if (!ret)
126                 fh->fh_want_write = true;
127         return ret;
128 }
129 
130 static inline void fh_drop_write(struct svc_fh *fh)
131 {
132         if (fh->fh_want_write) {
133                 fh->fh_want_write = false;
134                 mnt_drop_write(fh->fh_export->ex_path.mnt);
135         }
136 }
137 
138 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
139 {
140         struct path p = {.mnt = fh->fh_export->ex_path.mnt,
141                          .dentry = fh->fh_dentry};
142         return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS,
143                                     AT_STATX_SYNC_AS_STAT));
144 }
145 
146 static inline int nfsd_create_is_exclusive(int createmode)
147 {
148         return createmode == NFS3_CREATE_EXCLUSIVE
149                || createmode == NFS4_CREATE_EXCLUSIVE4_1;
150 }
151 
152 static inline bool nfsd_eof_on_read(long requested, long read,
153                                 loff_t offset, loff_t size)
154 {
155         /* We assume a short read means eof: */
156         if (requested > read)
157                 return true;
158         /*
159          * A non-short read might also reach end of file.  The spec
160          * still requires us to set eof in that case.
161          *
162          * Further operations may have modified the file size since
163          * the read, so the following check is not atomic with the read.
164          * We've only seen that cause a problem for a client in the case
165          * where the read returned a count of 0 without setting eof.
166          * That case was fixed by the addition of the above check.
167          */
168         return (offset + read >= size);
169 }
170 
171 #endif /* LINUX_NFSD_VFS_H */
172 

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