~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfsfh.h

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 /*
 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 = 0;
217         fhp->fh_pre_saved = 0;
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 = 1;
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 = 1;
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 = 0;
289         }
290 }
291 
292 #endif /* _LINUX_NFSD_NFSFH_H */
293 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp