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; 124 125 if (fh->fh_want_write) 126 return 0; 127 ret = mnt_want_write(fh->fh_export->ex_path.mnt); 128 if (!ret) 129 fh->fh_want_write = true; 130 return ret; 131 } 132 133 static inline void fh_drop_write(struct svc_fh *fh) 134 { 135 if (fh->fh_want_write) { 136 fh->fh_want_write = false; 137 mnt_drop_write(fh->fh_export->ex_path.mnt); 138 } 139 } 140 141 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat) 142 { 143 struct path p = {.mnt = fh->fh_export->ex_path.mnt, 144 .dentry = fh->fh_dentry}; 145 return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS, 146 AT_STATX_SYNC_AS_STAT)); 147 } 148 149 static inline int nfsd_create_is_exclusive(int createmode) 150 { 151 return createmode == NFS3_CREATE_EXCLUSIVE 152 || createmode == NFS4_CREATE_EXCLUSIVE4_1; 153 } 154 155 static inline bool nfsd_eof_on_read(long requested, long read, 156 loff_t offset, loff_t size) 157 { 158 /* We assume a short read means eof: */ 159 if (requested > read) 160 return true; 161 /* 162 * A non-short read might also reach end of file. The spec 163 * still requires us to set eof in that case. 164 * 165 * Further operations may have modified the file size since 166 * the read, so the following check is not atomic with the read. 167 * We've only seen that cause a problem for a client in the case 168 * where the read returned a count of 0 without setting eof. 169 * That case was fixed by the addition of the above check. 170 */ 171 return (offset + read >= size); 172 } 173 174 #endif /* LINUX_NFSD_VFS_H */ 175