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 struct dentry * fh_dentry; /* validated dentry */ 30 struct svc_export * fh_export; /* export pointer */ 31 int fh_maxsize; /* max size for fh_handle */ 32 33 unsigned char fh_locked; /* inode locked by us */ 34 unsigned char fh_want_write; /* remount protection taken */ 35 36 #ifdef CONFIG_NFSD_V3 37 unsigned char fh_post_saved; /* post-op attrs saved */ 38 unsigned char 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 /* This might look a little large to "inline" but in all calls except 77 * one, 'vers' is constant so moste of the function disappears. 78 */ 79 static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino, 80 u32 fsid, unsigned char *uuid) 81 { 82 u32 *up; 83 switch(vers) { 84 case FSID_DEV: 85 fsidv[0] = htonl((MAJOR(dev)<<16) | 86 MINOR(dev)); 87 fsidv[1] = ino_t_to_u32(ino); 88 break; 89 case FSID_NUM: 90 fsidv[0] = fsid; 91 break; 92 case FSID_MAJOR_MINOR: 93 fsidv[0] = htonl(MAJOR(dev)); 94 fsidv[1] = htonl(MINOR(dev)); 95 fsidv[2] = ino_t_to_u32(ino); 96 break; 97 98 case FSID_ENCODE_DEV: 99 fsidv[0] = new_encode_dev(dev); 100 fsidv[1] = ino_t_to_u32(ino); 101 break; 102 103 case FSID_UUID4_INUM: 104 /* 4 byte fsid and inode number */ 105 up = (u32*)uuid; 106 fsidv[0] = ino_t_to_u32(ino); 107 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3]; 108 break; 109 110 case FSID_UUID8: 111 /* 8 byte fsid */ 112 up = (u32*)uuid; 113 fsidv[0] = up[0] ^ up[2]; 114 fsidv[1] = up[1] ^ up[3]; 115 break; 116 117 case FSID_UUID16: 118 /* 16 byte fsid - NFSv3+ only */ 119 memcpy(fsidv, uuid, 16); 120 break; 121 122 case FSID_UUID16_INUM: 123 /* 8 byte inode and 16 byte fsid */ 124 *(u64*)fsidv = (u64)ino; 125 memcpy(fsidv+2, uuid, 16); 126 break; 127 default: BUG(); 128 } 129 } 130 131 static inline int key_len(int type) 132 { 133 switch(type) { 134 case FSID_DEV: return 8; 135 case FSID_NUM: return 4; 136 case FSID_MAJOR_MINOR: return 12; 137 case FSID_ENCODE_DEV: return 8; 138 case FSID_UUID4_INUM: return 8; 139 case FSID_UUID8: return 8; 140 case FSID_UUID16: return 16; 141 case FSID_UUID16_INUM: return 24; 142 default: return 0; 143 } 144 } 145 146 /* 147 * Shorthand for dprintk()'s 148 */ 149 extern char * SVCFH_fmt(struct svc_fh *fhp); 150 151 /* 152 * Function prototypes 153 */ 154 __be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int); 155 __be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); 156 __be32 fh_update(struct svc_fh *); 157 void fh_put(struct svc_fh *); 158 159 static __inline__ struct svc_fh * 160 fh_copy(struct svc_fh *dst, struct svc_fh *src) 161 { 162 WARN_ON(src->fh_dentry || src->fh_locked); 163 164 *dst = *src; 165 return dst; 166 } 167 168 static inline void 169 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src) 170 { 171 dst->fh_size = src->fh_size; 172 memcpy(&dst->fh_base, &src->fh_base, src->fh_size); 173 } 174 175 static __inline__ struct svc_fh * 176 fh_init(struct svc_fh *fhp, int maxsize) 177 { 178 memset(fhp, 0, sizeof(*fhp)); 179 fhp->fh_maxsize = maxsize; 180 return fhp; 181 } 182 183 #ifdef CONFIG_NFSD_V3 184 /* 185 * The wcc data stored in current_fh should be cleared 186 * between compound ops. 187 */ 188 static inline void 189 fh_clear_wcc(struct svc_fh *fhp) 190 { 191 fhp->fh_post_saved = 0; 192 fhp->fh_pre_saved = 0; 193 } 194 195 /* 196 * Fill in the pre_op attr for the wcc data 197 */ 198 static inline void 199 fill_pre_wcc(struct svc_fh *fhp) 200 { 201 struct inode *inode; 202 203 inode = fhp->fh_dentry->d_inode; 204 if (!fhp->fh_pre_saved) { 205 fhp->fh_pre_mtime = inode->i_mtime; 206 fhp->fh_pre_ctime = inode->i_ctime; 207 fhp->fh_pre_size = inode->i_size; 208 fhp->fh_pre_change = inode->i_version; 209 fhp->fh_pre_saved = 1; 210 } 211 } 212 213 extern void fill_post_wcc(struct svc_fh *); 214 #else 215 #define fh_clear_wcc(ignored) 216 #define fill_pre_wcc(ignored) 217 #define fill_post_wcc(notused) 218 #endif /* CONFIG_NFSD_V3 */ 219 220 221 /* 222 * Lock a file handle/inode 223 * NOTE: both fh_lock and fh_unlock are done "by hand" in 224 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once 225 * so, any changes here should be reflected there. 226 */ 227 228 static inline void 229 fh_lock_nested(struct svc_fh *fhp, unsigned int subclass) 230 { 231 struct dentry *dentry = fhp->fh_dentry; 232 struct inode *inode; 233 234 BUG_ON(!dentry); 235 236 if (fhp->fh_locked) { 237 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n", 238 dentry); 239 return; 240 } 241 242 inode = dentry->d_inode; 243 mutex_lock_nested(&inode->i_mutex, subclass); 244 fill_pre_wcc(fhp); 245 fhp->fh_locked = 1; 246 } 247 248 static inline void 249 fh_lock(struct svc_fh *fhp) 250 { 251 fh_lock_nested(fhp, I_MUTEX_NORMAL); 252 } 253 254 /* 255 * Unlock a file handle/inode 256 */ 257 static inline void 258 fh_unlock(struct svc_fh *fhp) 259 { 260 if (fhp->fh_locked) { 261 fill_post_wcc(fhp); 262 mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex); 263 fhp->fh_locked = 0; 264 } 265 } 266 267 #endif /* _LINUX_NFSD_NFSFH_H */ 268