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 *,struct file *, 87 loff_t, 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 *stablep); 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 __be32 nfsd_rename(struct svc_rqst *, 100 struct svc_fh *, char *, int, 101 struct svc_fh *, char *, int); 102 __be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type, 103 char *name, int len); 104 __be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *, 105 loff_t *, struct readdir_cd *, nfsd_filldir_t); 106 __be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *, 107 struct kstatfs *, int access); 108 109 __be32 nfsd_permission(struct svc_rqst *, struct svc_export *, 110 struct dentry *, int); 111 112 struct raparms *nfsd_init_raparms(struct file *file); 113 void nfsd_put_raparams(struct file *file, struct raparms *ra); 114 115 static inline int fh_want_write(struct svc_fh *fh) 116 { 117 int ret = mnt_want_write(fh->fh_export->ex_path.mnt); 118 119 if (!ret) 120 fh->fh_want_write = true; 121 return ret; 122 } 123 124 static inline void fh_drop_write(struct svc_fh *fh) 125 { 126 if (fh->fh_want_write) { 127 fh->fh_want_write = false; 128 mnt_drop_write(fh->fh_export->ex_path.mnt); 129 } 130 } 131 132 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat) 133 { 134 struct path p = {.mnt = fh->fh_export->ex_path.mnt, 135 .dentry = fh->fh_dentry}; 136 return nfserrno(vfs_getattr(&p, stat)); 137 } 138 139 static inline int nfsd_create_is_exclusive(int createmode) 140 { 141 return createmode == NFS3_CREATE_EXCLUSIVE 142 || createmode == NFS4_CREATE_EXCLUSIVE4_1; 143 } 144 145 static inline bool nfsd_eof_on_read(long requested, long read, 146 loff_t offset, loff_t size) 147 { 148 /* We assume a short read means eof: */ 149 if (requested > read) 150 return true; 151 /* 152 * A non-short read might also reach end of file. The spec 153 * still requires us to set eof in that case. 154 * 155 * Further operations may have modified the file size since 156 * the read, so the following check is not atomic with the read. 157 * We've only seen that cause a problem for a client in the case 158 * where the read returned a count of 0 without setting eof. 159 * That case was fixed by the addition of the above check. 160 */ 161 return (offset + read >= size); 162 } 163 164 #endif /* LINUX_NFSD_VFS_H */ 165