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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 struct nfsd_file;
 38 
 39 /*
 40  * Callback function for readdir
 41  */
 42 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
 43 
 44 /* nfsd/vfs.c */
 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, time64_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 nfsd_file *nf_src, u64 src_pos,
 61                                        struct nfsd_file *nf_dst, u64 dst_pos,
 62                                        u64 count, bool sync);
 63 #endif /* CONFIG_NFSD_V4 */
 64 __be32          nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
 65                                 char *name, int len, struct iattr *attrs,
 66                                 int type, dev_t rdev, struct svc_fh *res);
 67 __be32          nfsd_create(struct svc_rqst *, struct svc_fh *,
 68                                 char *name, int len, struct iattr *attrs,
 69                                 int type, dev_t rdev, struct svc_fh *res);
 70 #ifdef CONFIG_NFSD_V3
 71 __be32          nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
 72 __be32          do_nfsd_create(struct svc_rqst *, struct svc_fh *,
 73                                 char *name, int len, struct iattr *attrs,
 74                                 struct svc_fh *res, int createmode,
 75                                 u32 *verifier, bool *truncp, bool *created);
 76 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
 77                                 loff_t, unsigned long, __be32 *verf);
 78 #endif /* CONFIG_NFSD_V3 */
 79 int             nfsd_open_break_lease(struct inode *, int);
 80 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
 81                                 int, struct file **);
 82 __be32          nfsd_open_verified(struct svc_rqst *, struct svc_fh *, umode_t,
 83                                 int, struct file **);
 84 __be32          nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
 85                                 struct file *file, loff_t offset,
 86                                 unsigned long *count,
 87                                 u32 *eof);
 88 __be32          nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
 89                                 struct file *file, loff_t offset,
 90                                 struct kvec *vec, int vlen,
 91                                 unsigned long *count,
 92                                 u32 *eof);
 93 __be32          nfsd_read(struct svc_rqst *, struct svc_fh *,
 94                                 loff_t, struct kvec *, int, unsigned long *,
 95                                 u32 *eof);
 96 __be32          nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
 97                                 struct kvec *, int, unsigned long *,
 98                                 int stable, __be32 *verf);
 99 __be32          nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
100                                 struct nfsd_file *nf, loff_t offset,
101                                 struct kvec *vec, int vlen, unsigned long *cnt,
102                                 int stable, __be32 *verf);
103 __be32          nfsd_readlink(struct svc_rqst *, struct svc_fh *,
104                                 char *, int *);
105 __be32          nfsd_symlink(struct svc_rqst *, struct svc_fh *,
106                                 char *name, int len, char *path,
107                                 struct svc_fh *res);
108 __be32          nfsd_link(struct svc_rqst *, struct svc_fh *,
109                                 char *, int, struct svc_fh *);
110 ssize_t         nfsd_copy_file_range(struct file *, u64,
111                                      struct file *, u64, u64);
112 __be32          nfsd_rename(struct svc_rqst *,
113                                 struct svc_fh *, char *, int,
114                                 struct svc_fh *, char *, int);
115 __be32          nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
116                                 char *name, int len);
117 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
118                              loff_t *, struct readdir_cd *, nfsd_filldir_t);
119 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
120                                 struct kstatfs *, int access);
121 
122 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
123                                 struct dentry *, int);
124 
125 static inline int fh_want_write(struct svc_fh *fh)
126 {
127         int ret;
128 
129         if (fh->fh_want_write)
130                 return 0;
131         ret = mnt_want_write(fh->fh_export->ex_path.mnt);
132         if (!ret)
133                 fh->fh_want_write = true;
134         return ret;
135 }
136 
137 static inline void fh_drop_write(struct svc_fh *fh)
138 {
139         if (fh->fh_want_write) {
140                 fh->fh_want_write = false;
141                 mnt_drop_write(fh->fh_export->ex_path.mnt);
142         }
143 }
144 
145 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
146 {
147         struct path p = {.mnt = fh->fh_export->ex_path.mnt,
148                          .dentry = fh->fh_dentry};
149         return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS,
150                                     AT_STATX_SYNC_AS_STAT));
151 }
152 
153 static inline int nfsd_create_is_exclusive(int createmode)
154 {
155         return createmode == NFS3_CREATE_EXCLUSIVE
156                || createmode == NFS4_CREATE_EXCLUSIVE4_1;
157 }
158 
159 #endif /* LINUX_NFSD_VFS_H */
160 

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