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_locked(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 __be32 nfsd_create(struct svc_rqst *, struct svc_fh *, 66 char *name, int len, struct iattr *attrs, 67 int type, dev_t rdev, struct svc_fh *res); 68 #ifdef CONFIG_NFSD_V3 69 __be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *); 70 __be32 do_nfsd_create(struct svc_rqst *, struct svc_fh *, 71 char *name, int len, struct iattr *attrs, 72 struct svc_fh *res, int createmode, 73 u32 *verifier, bool *truncp, bool *created); 74 __be32 nfsd_commit(struct svc_rqst *, struct svc_fh *, 75 loff_t, unsigned long); 76 #endif /* CONFIG_NFSD_V3 */ 77 __be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t, 78 int, struct file **); 79 struct raparms; 80 __be32 nfsd_splice_read(struct svc_rqst *, 81 struct file *, loff_t, unsigned long *); 82 __be32 nfsd_readv(struct file *, loff_t, struct kvec *, int, 83 unsigned long *); 84 __be32 nfsd_read(struct svc_rqst *, struct svc_fh *, 85 loff_t, struct kvec *, int, unsigned long *); 86 __be32 nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t, 87 struct kvec *, int, unsigned long *, int); 88 __be32 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, 89 struct file *file, loff_t offset, 90 struct kvec *vec, int vlen, unsigned long *cnt, 91 int stable); 92 __be32 nfsd_readlink(struct svc_rqst *, struct svc_fh *, 93 char *, int *); 94 __be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *, 95 char *name, int len, char *path, 96 struct svc_fh *res); 97 __be32 nfsd_link(struct svc_rqst *, struct svc_fh *, 98 char *, int, struct svc_fh *); 99 ssize_t nfsd_copy_file_range(struct file *, u64, 100 struct file *, u64, u64); 101 __be32 nfsd_rename(struct svc_rqst *, 102 struct svc_fh *, char *, int, 103 struct svc_fh *, char *, int); 104 __be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type, 105 char *name, int len); 106 __be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *, 107 loff_t *, struct readdir_cd *, nfsd_filldir_t); 108 __be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *, 109 struct kstatfs *, int access); 110 111 __be32 nfsd_permission(struct svc_rqst *, struct svc_export *, 112 struct dentry *, int); 113 114 struct raparms *nfsd_init_raparms(struct file *file); 115 void nfsd_put_raparams(struct file *file, struct raparms *ra); 116 117 static inline int fh_want_write(struct svc_fh *fh) 118 { 119 int ret = mnt_want_write(fh->fh_export->ex_path.mnt); 120 121 if (!ret) 122 fh->fh_want_write = true; 123 return ret; 124 } 125 126 static inline void fh_drop_write(struct svc_fh *fh) 127 { 128 if (fh->fh_want_write) { 129 fh->fh_want_write = false; 130 mnt_drop_write(fh->fh_export->ex_path.mnt); 131 } 132 } 133 134 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat) 135 { 136 struct path p = {.mnt = fh->fh_export->ex_path.mnt, 137 .dentry = fh->fh_dentry}; 138 return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS, 139 AT_STATX_SYNC_AS_STAT)); 140 } 141 142 static inline int nfsd_create_is_exclusive(int createmode) 143 { 144 return createmode == NFS3_CREATE_EXCLUSIVE 145 || createmode == NFS4_CREATE_EXCLUSIVE4_1; 146 } 147 148 static inline bool nfsd_eof_on_read(long requested, long read, 149 loff_t offset, loff_t size) 150 { 151 /* We assume a short read means eof: */ 152 if (requested > read) 153 return true; 154 /* 155 * A non-short read might also reach end of file. The spec 156 * still requires us to set eof in that case. 157 * 158 * Further operations may have modified the file size since 159 * the read, so the following check is not atomic with the read. 160 * We've only seen that cause a problem for a client in the case 161 * where the read returned a count of 0 without setting eof. 162 * That case was fixed by the addition of the above check. 163 */ 164 return (offset + read >= size); 165 } 166 167 #endif /* LINUX_NFSD_VFS_H */ 168