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Linux/fs/nfsd/nfsfh.h

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  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/crc32.h>
 11 #include <linux/sunrpc/svc.h>
 12 #include <uapi/linux/nfsd/nfsfh.h>
 13 
 14 static inline __u32 ino_t_to_u32(ino_t ino)
 15 {
 16         return (__u32) ino;
 17 }
 18 
 19 static inline ino_t u32_to_ino_t(__u32 uino)
 20 {
 21         return (ino_t) uino;
 22 }
 23 
 24 /*
 25  * This is the internal representation of an NFS handle used in knfsd.
 26  * pre_mtime/post_version will be used to support wcc_attr's in NFSv3.
 27  */
 28 typedef struct svc_fh {
 29         struct knfsd_fh         fh_handle;      /* FH data */
 30         int                     fh_maxsize;     /* max size for fh_handle */
 31         struct dentry *         fh_dentry;      /* validated dentry */
 32         struct svc_export *     fh_export;      /* export pointer */
 33 
 34         bool                    fh_locked;      /* inode locked by us */
 35         bool                    fh_want_write;  /* remount protection taken */
 36 
 37 #ifdef CONFIG_NFSD_V3
 38         bool                    fh_post_saved;  /* post-op attrs saved */
 39         bool                    fh_pre_saved;   /* pre-op attrs saved */
 40 
 41         /* Pre-op attributes saved during fh_lock */
 42         __u64                   fh_pre_size;    /* size before operation */
 43         struct timespec         fh_pre_mtime;   /* mtime before oper */
 44         struct timespec         fh_pre_ctime;   /* ctime before oper */
 45         /*
 46          * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
 47          *  to find out if it is valid.
 48          */
 49         u64                     fh_pre_change;
 50 
 51         /* Post-op attributes saved in fh_unlock */
 52         struct kstat            fh_post_attr;   /* full attrs after operation */
 53         u64                     fh_post_change; /* nfsv4 change; see above */
 54 #endif /* CONFIG_NFSD_V3 */
 55 
 56 } svc_fh;
 57 
 58 enum nfsd_fsid {
 59         FSID_DEV = 0,
 60         FSID_NUM,
 61         FSID_MAJOR_MINOR,
 62         FSID_ENCODE_DEV,
 63         FSID_UUID4_INUM,
 64         FSID_UUID8,
 65         FSID_UUID16,
 66         FSID_UUID16_INUM,
 67 };
 68 
 69 enum fsid_source {
 70         FSIDSOURCE_DEV,
 71         FSIDSOURCE_FSID,
 72         FSIDSOURCE_UUID,
 73 };
 74 extern enum fsid_source fsid_source(struct svc_fh *fhp);
 75 
 76 
 77 /*
 78  * This might look a little large to "inline" but in all calls except
 79  * one, 'vers' is constant so moste of the function disappears.
 80  *
 81  * In some cases the values are considered to be host endian and in
 82  * others, net endian. fsidv is always considered to be u32 as the
 83  * callers don't know which it will be. So we must use __force to keep
 84  * sparse from complaining. Since these values are opaque to the
 85  * client, that shouldn't be a problem.
 86  */
 87 static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
 88                            u32 fsid, unsigned char *uuid)
 89 {
 90         u32 *up;
 91         switch(vers) {
 92         case FSID_DEV:
 93                 fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) |
 94                                  MINOR(dev));
 95                 fsidv[1] = ino_t_to_u32(ino);
 96                 break;
 97         case FSID_NUM:
 98                 fsidv[0] = fsid;
 99                 break;
100         case FSID_MAJOR_MINOR:
101                 fsidv[0] = (__force __u32)htonl(MAJOR(dev));
102                 fsidv[1] = (__force __u32)htonl(MINOR(dev));
103                 fsidv[2] = ino_t_to_u32(ino);
104                 break;
105 
106         case FSID_ENCODE_DEV:
107                 fsidv[0] = new_encode_dev(dev);
108                 fsidv[1] = ino_t_to_u32(ino);
109                 break;
110 
111         case FSID_UUID4_INUM:
112                 /* 4 byte fsid and inode number */
113                 up = (u32*)uuid;
114                 fsidv[0] = ino_t_to_u32(ino);
115                 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
116                 break;
117 
118         case FSID_UUID8:
119                 /* 8 byte fsid  */
120                 up = (u32*)uuid;
121                 fsidv[0] = up[0] ^ up[2];
122                 fsidv[1] = up[1] ^ up[3];
123                 break;
124 
125         case FSID_UUID16:
126                 /* 16 byte fsid - NFSv3+ only */
127                 memcpy(fsidv, uuid, 16);
128                 break;
129 
130         case FSID_UUID16_INUM:
131                 /* 8 byte inode and 16 byte fsid */
132                 *(u64*)fsidv = (u64)ino;
133                 memcpy(fsidv+2, uuid, 16);
134                 break;
135         default: BUG();
136         }
137 }
138 
139 static inline int key_len(int type)
140 {
141         switch(type) {
142         case FSID_DEV:          return 8;
143         case FSID_NUM:          return 4;
144         case FSID_MAJOR_MINOR:  return 12;
145         case FSID_ENCODE_DEV:   return 8;
146         case FSID_UUID4_INUM:   return 8;
147         case FSID_UUID8:        return 8;
148         case FSID_UUID16:       return 16;
149         case FSID_UUID16_INUM:  return 24;
150         default: return 0;
151         }
152 }
153 
154 /*
155  * Shorthand for dprintk()'s
156  */
157 extern char * SVCFH_fmt(struct svc_fh *fhp);
158 
159 /*
160  * Function prototypes
161  */
162 __be32  fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
163 __be32  fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
164 __be32  fh_update(struct svc_fh *);
165 void    fh_put(struct svc_fh *);
166 
167 static __inline__ struct svc_fh *
168 fh_copy(struct svc_fh *dst, struct svc_fh *src)
169 {
170         WARN_ON(src->fh_dentry || src->fh_locked);
171                         
172         *dst = *src;
173         return dst;
174 }
175 
176 static inline void
177 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
178 {
179         dst->fh_size = src->fh_size;
180         memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
181 }
182 
183 static __inline__ struct svc_fh *
184 fh_init(struct svc_fh *fhp, int maxsize)
185 {
186         memset(fhp, 0, sizeof(*fhp));
187         fhp->fh_maxsize = maxsize;
188         return fhp;
189 }
190 
191 static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
192 {
193         if (fh1->fh_size != fh2->fh_size)
194                 return false;
195         if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
196                 return false;
197         return true;
198 }
199 
200 static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
201 {
202         if (fh1->fh_fsid_type != fh2->fh_fsid_type)
203                 return false;
204         if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0)
205                 return false;
206         return true;
207 }
208 
209 #ifdef CONFIG_CRC32
210 /**
211  * knfsd_fh_hash - calculate the crc32 hash for the filehandle
212  * @fh - pointer to filehandle
213  *
214  * returns a crc32 hash for the filehandle that is compatible with
215  * the one displayed by "wireshark".
216  */
217 
218 static inline u32
219 knfsd_fh_hash(struct knfsd_fh *fh)
220 {
221         return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
222 }
223 #else
224 static inline u32
225 knfsd_fh_hash(struct knfsd_fh *fh)
226 {
227         return 0;
228 }
229 #endif
230 
231 #ifdef CONFIG_NFSD_V3
232 /*
233  * The wcc data stored in current_fh should be cleared
234  * between compound ops.
235  */
236 static inline void
237 fh_clear_wcc(struct svc_fh *fhp)
238 {
239         fhp->fh_post_saved = false;
240         fhp->fh_pre_saved = false;
241 }
242 
243 /*
244  * Fill in the pre_op attr for the wcc data
245  */
246 static inline void
247 fill_pre_wcc(struct svc_fh *fhp)
248 {
249         struct inode    *inode;
250 
251         inode = d_inode(fhp->fh_dentry);
252         if (!fhp->fh_pre_saved) {
253                 fhp->fh_pre_mtime = inode->i_mtime;
254                 fhp->fh_pre_ctime = inode->i_ctime;
255                 fhp->fh_pre_size  = inode->i_size;
256                 fhp->fh_pre_change = inode->i_version;
257                 fhp->fh_pre_saved = true;
258         }
259 }
260 
261 extern void fill_post_wcc(struct svc_fh *);
262 #else
263 #define fh_clear_wcc(ignored)
264 #define fill_pre_wcc(ignored)
265 #define fill_post_wcc(notused)
266 #endif /* CONFIG_NFSD_V3 */
267 
268 
269 /*
270  * Lock a file handle/inode
271  * NOTE: both fh_lock and fh_unlock are done "by hand" in
272  * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
273  * so, any changes here should be reflected there.
274  */
275 
276 static inline void
277 fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
278 {
279         struct dentry   *dentry = fhp->fh_dentry;
280         struct inode    *inode;
281 
282         BUG_ON(!dentry);
283 
284         if (fhp->fh_locked) {
285                 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
286                         dentry);
287                 return;
288         }
289 
290         inode = d_inode(dentry);
291         inode_lock_nested(inode, subclass);
292         fill_pre_wcc(fhp);
293         fhp->fh_locked = true;
294 }
295 
296 static inline void
297 fh_lock(struct svc_fh *fhp)
298 {
299         fh_lock_nested(fhp, I_MUTEX_NORMAL);
300 }
301 
302 /*
303  * Unlock a file handle/inode
304  */
305 static inline void
306 fh_unlock(struct svc_fh *fhp)
307 {
308         if (fhp->fh_locked) {
309                 fill_post_wcc(fhp);
310                 inode_unlock(d_inode(fhp->fh_dentry));
311                 fhp->fh_locked = false;
312         }
313 }
314 
315 #endif /* _LINUX_NFSD_NFSFH_H */
316 

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