1 /* 2 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> 3 * 4 * This file describes the layout of the file handles as passed 5 * over the wire. 6 */ 7 #ifndef _LINUX_NFSD_NFSFH_H 8 #define _LINUX_NFSD_NFSFH_H 9 10 #include <linux/sunrpc/svc.h> 11 #include <uapi/linux/nfsd/nfsfh.h> 12 13 static inline __u32 ino_t_to_u32(ino_t ino) 14 { 15 return (__u32) ino; 16 } 17 18 static inline ino_t u32_to_ino_t(__u32 uino) 19 { 20 return (ino_t) uino; 21 } 22 23 /* 24 * This is the internal representation of an NFS handle used in knfsd. 25 * pre_mtime/post_version will be used to support wcc_attr's in NFSv3. 26 */ 27 typedef struct svc_fh { 28 struct knfsd_fh fh_handle; /* FH data */ 29 int fh_maxsize; /* max size for fh_handle */ 30 struct dentry * fh_dentry; /* validated dentry */ 31 struct svc_export * fh_export; /* export pointer */ 32 33 bool fh_locked; /* inode locked by us */ 34 bool fh_want_write; /* remount protection taken */ 35 36 #ifdef CONFIG_NFSD_V3 37 bool fh_post_saved; /* post-op attrs saved */ 38 bool fh_pre_saved; /* pre-op attrs saved */ 39 40 /* Pre-op attributes saved during fh_lock */ 41 __u64 fh_pre_size; /* size before operation */ 42 struct timespec fh_pre_mtime; /* mtime before oper */ 43 struct timespec fh_pre_ctime; /* ctime before oper */ 44 /* 45 * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode) 46 * to find out if it is valid. 47 */ 48 u64 fh_pre_change; 49 50 /* Post-op attributes saved in fh_unlock */ 51 struct kstat fh_post_attr; /* full attrs after operation */ 52 u64 fh_post_change; /* nfsv4 change; see above */ 53 #endif /* CONFIG_NFSD_V3 */ 54 55 } svc_fh; 56 57 enum nfsd_fsid { 58 FSID_DEV = 0, 59 FSID_NUM, 60 FSID_MAJOR_MINOR, 61 FSID_ENCODE_DEV, 62 FSID_UUID4_INUM, 63 FSID_UUID8, 64 FSID_UUID16, 65 FSID_UUID16_INUM, 66 }; 67 68 enum fsid_source { 69 FSIDSOURCE_DEV, 70 FSIDSOURCE_FSID, 71 FSIDSOURCE_UUID, 72 }; 73 extern enum fsid_source fsid_source(struct svc_fh *fhp); 74 75 76 /* 77 * This might look a little large to "inline" but in all calls except 78 * one, 'vers' is constant so moste of the function disappears. 79 * 80 * In some cases the values are considered to be host endian and in 81 * others, net endian. fsidv is always considered to be u32 as the 82 * callers don't know which it will be. So we must use __force to keep 83 * sparse from complaining. Since these values are opaque to the 84 * client, that shouldn't be a problem. 85 */ 86 static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino, 87 u32 fsid, unsigned char *uuid) 88 { 89 u32 *up; 90 switch(vers) { 91 case FSID_DEV: 92 fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) | 93 MINOR(dev)); 94 fsidv[1] = ino_t_to_u32(ino); 95 break; 96 case FSID_NUM: 97 fsidv[0] = fsid; 98 break; 99 case FSID_MAJOR_MINOR: 100 fsidv[0] = (__force __u32)htonl(MAJOR(dev)); 101 fsidv[1] = (__force __u32)htonl(MINOR(dev)); 102 fsidv[2] = ino_t_to_u32(ino); 103 break; 104 105 case FSID_ENCODE_DEV: 106 fsidv[0] = new_encode_dev(dev); 107 fsidv[1] = ino_t_to_u32(ino); 108 break; 109 110 case FSID_UUID4_INUM: 111 /* 4 byte fsid and inode number */ 112 up = (u32*)uuid; 113 fsidv[0] = ino_t_to_u32(ino); 114 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3]; 115 break; 116 117 case FSID_UUID8: 118 /* 8 byte fsid */ 119 up = (u32*)uuid; 120 fsidv[0] = up[0] ^ up[2]; 121 fsidv[1] = up[1] ^ up[3]; 122 break; 123 124 case FSID_UUID16: 125 /* 16 byte fsid - NFSv3+ only */ 126 memcpy(fsidv, uuid, 16); 127 break; 128 129 case FSID_UUID16_INUM: 130 /* 8 byte inode and 16 byte fsid */ 131 *(u64*)fsidv = (u64)ino; 132 memcpy(fsidv+2, uuid, 16); 133 break; 134 default: BUG(); 135 } 136 } 137 138 static inline int key_len(int type) 139 { 140 switch(type) { 141 case FSID_DEV: return 8; 142 case FSID_NUM: return 4; 143 case FSID_MAJOR_MINOR: return 12; 144 case FSID_ENCODE_DEV: return 8; 145 case FSID_UUID4_INUM: return 8; 146 case FSID_UUID8: return 8; 147 case FSID_UUID16: return 16; 148 case FSID_UUID16_INUM: return 24; 149 default: return 0; 150 } 151 } 152 153 /* 154 * Shorthand for dprintk()'s 155 */ 156 extern char * SVCFH_fmt(struct svc_fh *fhp); 157 158 /* 159 * Function prototypes 160 */ 161 __be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int); 162 __be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); 163 __be32 fh_update(struct svc_fh *); 164 void fh_put(struct svc_fh *); 165 166 static __inline__ struct svc_fh * 167 fh_copy(struct svc_fh *dst, struct svc_fh *src) 168 { 169 WARN_ON(src->fh_dentry || src->fh_locked); 170 171 *dst = *src; 172 return dst; 173 } 174 175 static inline void 176 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src) 177 { 178 dst->fh_size = src->fh_size; 179 memcpy(&dst->fh_base, &src->fh_base, src->fh_size); 180 } 181 182 static __inline__ struct svc_fh * 183 fh_init(struct svc_fh *fhp, int maxsize) 184 { 185 memset(fhp, 0, sizeof(*fhp)); 186 fhp->fh_maxsize = maxsize; 187 return fhp; 188 } 189 190 static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2) 191 { 192 if (fh1->fh_size != fh2->fh_size) 193 return false; 194 if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0) 195 return false; 196 return true; 197 } 198 199 static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2) 200 { 201 if (fh1->fh_fsid_type != fh2->fh_fsid_type) 202 return false; 203 if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0) 204 return false; 205 return true; 206 } 207 208 #ifdef CONFIG_NFSD_V3 209 /* 210 * The wcc data stored in current_fh should be cleared 211 * between compound ops. 212 */ 213 static inline void 214 fh_clear_wcc(struct svc_fh *fhp) 215 { 216 fhp->fh_post_saved = false; 217 fhp->fh_pre_saved = false; 218 } 219 220 /* 221 * Fill in the pre_op attr for the wcc data 222 */ 223 static inline void 224 fill_pre_wcc(struct svc_fh *fhp) 225 { 226 struct inode *inode; 227 228 inode = d_inode(fhp->fh_dentry); 229 if (!fhp->fh_pre_saved) { 230 fhp->fh_pre_mtime = inode->i_mtime; 231 fhp->fh_pre_ctime = inode->i_ctime; 232 fhp->fh_pre_size = inode->i_size; 233 fhp->fh_pre_change = inode->i_version; 234 fhp->fh_pre_saved = true; 235 } 236 } 237 238 extern void fill_post_wcc(struct svc_fh *); 239 #else 240 #define fh_clear_wcc(ignored) 241 #define fill_pre_wcc(ignored) 242 #define fill_post_wcc(notused) 243 #endif /* CONFIG_NFSD_V3 */ 244 245 246 /* 247 * Lock a file handle/inode 248 * NOTE: both fh_lock and fh_unlock are done "by hand" in 249 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once 250 * so, any changes here should be reflected there. 251 */ 252 253 static inline void 254 fh_lock_nested(struct svc_fh *fhp, unsigned int subclass) 255 { 256 struct dentry *dentry = fhp->fh_dentry; 257 struct inode *inode; 258 259 BUG_ON(!dentry); 260 261 if (fhp->fh_locked) { 262 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n", 263 dentry); 264 return; 265 } 266 267 inode = d_inode(dentry); 268 mutex_lock_nested(&inode->i_mutex, subclass); 269 fill_pre_wcc(fhp); 270 fhp->fh_locked = true; 271 } 272 273 static inline void 274 fh_lock(struct svc_fh *fhp) 275 { 276 fh_lock_nested(fhp, I_MUTEX_NORMAL); 277 } 278 279 /* 280 * Unlock a file handle/inode 281 */ 282 static inline void 283 fh_unlock(struct svc_fh *fhp) 284 { 285 if (fhp->fh_locked) { 286 fill_post_wcc(fhp); 287 mutex_unlock(&d_inode(fhp->fh_dentry)->i_mutex); 288 fhp->fh_locked = false; 289 } 290 } 291 292 #endif /* _LINUX_NFSD_NFSFH_H */ 293