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 <linux/fs.h> 10 #include <linux/posix_acl.h> 11 #include "nfsfh.h" 12 #include "nfsd.h" 13 14 /* 15 * Flags for nfsd_permission 16 */ 17 #define NFSD_MAY_NOP 0 18 #define NFSD_MAY_EXEC 0x001 /* == MAY_EXEC */ 19 #define NFSD_MAY_WRITE 0x002 /* == MAY_WRITE */ 20 #define NFSD_MAY_READ 0x004 /* == MAY_READ */ 21 #define NFSD_MAY_SATTR 0x008 22 #define NFSD_MAY_TRUNC 0x010 23 #define NFSD_MAY_LOCK 0x020 24 #define NFSD_MAY_MASK 0x03f 25 26 /* extra hints to permission and open routines: */ 27 #define NFSD_MAY_OWNER_OVERRIDE 0x040 28 #define NFSD_MAY_LOCAL_ACCESS 0x080 /* for device special files */ 29 #define NFSD_MAY_BYPASS_GSS_ON_ROOT 0x100 30 #define NFSD_MAY_NOT_BREAK_LEASE 0x200 31 #define NFSD_MAY_BYPASS_GSS 0x400 32 #define NFSD_MAY_READ_IF_EXEC 0x800 33 34 #define NFSD_MAY_64BIT_COOKIE 0x1000 /* 64 bit readdir cookies for >= NFSv3 */ 35 36 #define NFSD_MAY_LOCALIO 0x2000 /* for tracing, reflects when localio used */ 37 38 #define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE) 39 #define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC) 40 41 struct nfsd_file; 42 43 /* 44 * Callback function for readdir 45 */ 46 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned); 47 48 /* nfsd/vfs.c */ 49 struct nfsd_attrs { 50 struct iattr *na_iattr; /* input */ 51 struct xdr_netobj *na_seclabel; /* input */ 52 struct posix_acl *na_pacl; /* input */ 53 struct posix_acl *na_dpacl; /* input */ 54 55 int na_labelerr; /* output */ 56 int na_aclerr; /* output */ 57 }; 58 59 static inline void nfsd_attrs_free(struct nfsd_attrs *attrs) 60 { 61 posix_acl_release(attrs->na_pacl); 62 posix_acl_release(attrs->na_dpacl); 63 } 64 65 static inline bool nfsd_attrs_valid(struct nfsd_attrs *attrs) 66 { 67 struct iattr *iap = attrs->na_iattr; 68 69 return (iap->ia_valid || (attrs->na_seclabel && 70 attrs->na_seclabel->len)); 71 } 72 73 __be32 nfserrno (int errno); 74 int nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 75 struct svc_export **expp); 76 __be32 nfsd_lookup(struct svc_rqst *, struct svc_fh *, 77 const char *, unsigned int, struct svc_fh *); 78 __be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *, 79 const char *, unsigned int, 80 struct svc_export **, struct dentry **); 81 __be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *, 82 struct nfsd_attrs *, const struct timespec64 *); 83 int nfsd_mountpoint(struct dentry *, struct svc_export *); 84 #ifdef CONFIG_NFSD_V4 85 __be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *, 86 struct file *, loff_t, loff_t, int); 87 __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp, 88 struct nfsd_file *nf_src, u64 src_pos, 89 struct nfsd_file *nf_dst, u64 dst_pos, 90 u64 count, bool sync); 91 #endif /* CONFIG_NFSD_V4 */ 92 __be32 nfsd_create_locked(struct svc_rqst *, struct svc_fh *, 93 struct nfsd_attrs *attrs, int type, dev_t rdev, 94 struct svc_fh *res); 95 __be32 nfsd_create(struct svc_rqst *, struct svc_fh *, 96 char *name, int len, struct nfsd_attrs *attrs, 97 int type, dev_t rdev, struct svc_fh *res); 98 __be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *); 99 __be32 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 100 struct svc_fh *resfhp, struct nfsd_attrs *iap); 101 __be32 nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp, 102 struct nfsd_file *nf, u64 offset, u32 count, 103 __be32 *verf); 104 #ifdef CONFIG_NFSD_V4 105 __be32 nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 106 char *name, void **bufp, int *lenp); 107 __be32 nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 108 char **bufp, int *lenp); 109 __be32 nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 110 char *name); 111 __be32 nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 112 char *name, void *buf, u32 len, u32 flags); 113 #endif 114 int nfsd_open_break_lease(struct inode *, int); 115 __be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t, 116 int, struct file **); 117 int nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, 118 int may_flags, struct file **filp); 119 __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 120 struct file *file, loff_t offset, 121 unsigned long *count, 122 u32 *eof); 123 __be32 nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 124 struct file *file, loff_t offset, 125 unsigned long *count, unsigned int base, 126 u32 *eof); 127 bool nfsd_read_splice_ok(struct svc_rqst *rqstp); 128 __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 129 loff_t offset, unsigned long *count, 130 u32 *eof); 131 __be32 nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t, 132 struct kvec *, int, unsigned long *, 133 int stable, __be32 *verf); 134 __be32 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, 135 struct nfsd_file *nf, loff_t offset, 136 struct kvec *vec, int vlen, unsigned long *cnt, 137 int stable, __be32 *verf); 138 __be32 nfsd_readlink(struct svc_rqst *, struct svc_fh *, 139 char *, int *); 140 __be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *, 141 char *name, int len, char *path, 142 struct nfsd_attrs *attrs, 143 struct svc_fh *res); 144 __be32 nfsd_link(struct svc_rqst *, struct svc_fh *, 145 char *, int, struct svc_fh *); 146 ssize_t nfsd_copy_file_range(struct file *, u64, 147 struct file *, u64, u64); 148 __be32 nfsd_rename(struct svc_rqst *, 149 struct svc_fh *, char *, int, 150 struct svc_fh *, char *, int); 151 __be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type, 152 char *name, int len); 153 __be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *, 154 loff_t *, struct readdir_cd *, nfsd_filldir_t); 155 __be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *, 156 struct kstatfs *, int access); 157 158 __be32 nfsd_permission(struct svc_cred *cred, struct svc_export *exp, 159 struct dentry *dentry, int acc); 160 161 void nfsd_filp_close(struct file *fp); 162 163 static inline int fh_want_write(struct svc_fh *fh) 164 { 165 int ret; 166 167 if (fh->fh_want_write) 168 return 0; 169 ret = mnt_want_write(fh->fh_export->ex_path.mnt); 170 if (!ret) 171 fh->fh_want_write = true; 172 return ret; 173 } 174 175 static inline void fh_drop_write(struct svc_fh *fh) 176 { 177 if (fh->fh_want_write) { 178 fh->fh_want_write = false; 179 mnt_drop_write(fh->fh_export->ex_path.mnt); 180 } 181 } 182 183 static inline __be32 fh_getattr(const struct svc_fh *fh, struct kstat *stat) 184 { 185 u32 request_mask = STATX_BASIC_STATS; 186 struct path p = {.mnt = fh->fh_export->ex_path.mnt, 187 .dentry = fh->fh_dentry}; 188 189 if (fh->fh_maxsize == NFS4_FHSIZE) 190 request_mask |= (STATX_BTIME | STATX_CHANGE_COOKIE); 191 192 return nfserrno(vfs_getattr(&p, stat, request_mask, 193 AT_STATX_SYNC_AS_STAT)); 194 } 195 196 #endif /* LINUX_NFSD_VFS_H */ 197