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