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1da177e4 LT |
1 | /* |
2 | * include/linux/nfsd/nfsfh.h | |
3 | * | |
4 | * This file describes the layout of the file handles as passed | |
5 | * over the wire. | |
6 | * | |
7 | * Earlier versions of knfsd used to sign file handles using keyed MD5 | |
8 | * or SHA. I've removed this code, because it doesn't give you more | |
9 | * security than blocking external access to port 2049 on your firewall. | |
10 | * | |
11 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
12 | */ | |
13 | ||
14 | #ifndef _LINUX_NFSD_FH_H | |
15 | #define _LINUX_NFSD_FH_H | |
16 | ||
17 | #include <asm/types.h> | |
18 | #ifdef __KERNEL__ | |
19 | # include <linux/config.h> | |
20 | # include <linux/types.h> | |
21 | # include <linux/string.h> | |
22 | # include <linux/fs.h> | |
23 | #endif | |
24 | #include <linux/nfsd/const.h> | |
25 | #include <linux/nfsd/debug.h> | |
26 | ||
27 | /* | |
28 | * This is the old "dentry style" Linux NFSv2 file handle. | |
29 | * | |
30 | * The xino and xdev fields are currently used to transport the | |
31 | * ino/dev of the exported inode. | |
32 | */ | |
33 | struct nfs_fhbase_old { | |
34 | __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ | |
35 | __u32 fb_ino; /* our inode number */ | |
36 | __u32 fb_dirino; /* dir inode number, 0 for directories */ | |
37 | __u32 fb_dev; /* our device */ | |
38 | __u32 fb_xdev; | |
39 | __u32 fb_xino; | |
40 | __u32 fb_generation; | |
41 | }; | |
42 | ||
43 | /* | |
44 | * This is the new flexible, extensible style NFSv2/v3 file handle. | |
45 | * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 | |
46 | * | |
47 | * The file handle is seens as a list of 4byte words. | |
48 | * The first word contains a version number (1) and four descriptor bytes | |
49 | * that tell how the remaining 3 variable length fields should be handled. | |
50 | * These three bytes are auth_type, fsid_type and fileid_type. | |
51 | * | |
52 | * All 4byte values are in host-byte-order. | |
53 | * | |
54 | * The auth_type field specifies how the filehandle can be authenticated | |
55 | * This might allow a file to be confirmed to be in a writable part of a | |
56 | * filetree without checking the path from it upto the root. | |
57 | * Current values: | |
58 | * 0 - No authentication. fb_auth is 0 bytes long | |
59 | * Possible future values: | |
60 | * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle | |
61 | * prefixed by a secret and with the important export flags. | |
62 | * | |
63 | * The fsid_type identifies how the filesystem (or export point) is | |
64 | * encoded. | |
65 | * Current values: | |
66 | * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number | |
67 | * NOTE: we cannot use the kdev_t device id value, because kdev_t.h | |
68 | * says we mustn't. We must break it up and reassemble. | |
69 | * 1 - 4 byte user specified identifier | |
70 | * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED | |
71 | * 3 - 4 byte device id, encoded for user-space, 4 byte inode number | |
72 | * | |
73 | * The fileid_type identified how the file within the filesystem is encoded. | |
74 | * This is (will be) passed to, and set by, the underlying filesystem if it supports | |
75 | * filehandle operations. The filesystem must not use the value '0' or '0xff' and may | |
76 | * only use the values 1 and 2 as defined below: | |
77 | * Current values: | |
78 | * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes. | |
79 | * 1 - 32bit inode number, 32 bit generation number. | |
80 | * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number. | |
81 | * | |
82 | */ | |
83 | struct nfs_fhbase_new { | |
84 | __u8 fb_version; /* == 1, even => nfs_fhbase_old */ | |
85 | __u8 fb_auth_type; | |
86 | __u8 fb_fsid_type; | |
87 | __u8 fb_fileid_type; | |
88 | __u32 fb_auth[1]; | |
89 | /* __u32 fb_fsid[0]; floating */ | |
90 | /* __u32 fb_fileid[0]; floating */ | |
91 | }; | |
92 | ||
93 | struct knfsd_fh { | |
94 | unsigned int fh_size; /* significant for NFSv3. | |
95 | * Points to the current size while building | |
96 | * a new file handle | |
97 | */ | |
98 | union { | |
99 | struct nfs_fhbase_old fh_old; | |
100 | __u32 fh_pad[NFS4_FHSIZE/4]; | |
101 | struct nfs_fhbase_new fh_new; | |
102 | } fh_base; | |
103 | }; | |
104 | ||
105 | #define ofh_dcookie fh_base.fh_old.fb_dcookie | |
106 | #define ofh_ino fh_base.fh_old.fb_ino | |
107 | #define ofh_dirino fh_base.fh_old.fb_dirino | |
108 | #define ofh_dev fh_base.fh_old.fb_dev | |
109 | #define ofh_xdev fh_base.fh_old.fb_xdev | |
110 | #define ofh_xino fh_base.fh_old.fb_xino | |
111 | #define ofh_generation fh_base.fh_old.fb_generation | |
112 | ||
113 | #define fh_version fh_base.fh_new.fb_version | |
114 | #define fh_fsid_type fh_base.fh_new.fb_fsid_type | |
115 | #define fh_auth_type fh_base.fh_new.fb_auth_type | |
116 | #define fh_fileid_type fh_base.fh_new.fb_fileid_type | |
117 | #define fh_auth fh_base.fh_new.fb_auth | |
118 | #define fh_fsid fh_base.fh_new.fb_auth | |
119 | ||
120 | #ifdef __KERNEL__ | |
121 | ||
122 | static inline __u32 ino_t_to_u32(ino_t ino) | |
123 | { | |
124 | return (__u32) ino; | |
125 | } | |
126 | ||
127 | static inline ino_t u32_to_ino_t(__u32 uino) | |
128 | { | |
129 | return (ino_t) uino; | |
130 | } | |
131 | ||
132 | /* | |
133 | * This is the internal representation of an NFS handle used in knfsd. | |
134 | * pre_mtime/post_version will be used to support wcc_attr's in NFSv3. | |
135 | */ | |
136 | typedef struct svc_fh { | |
137 | struct knfsd_fh fh_handle; /* FH data */ | |
138 | struct dentry * fh_dentry; /* validated dentry */ | |
139 | struct svc_export * fh_export; /* export pointer */ | |
140 | int fh_maxsize; /* max size for fh_handle */ | |
141 | ||
142 | unsigned char fh_locked; /* inode locked by us */ | |
143 | ||
144 | #ifdef CONFIG_NFSD_V3 | |
145 | unsigned char fh_post_saved; /* post-op attrs saved */ | |
146 | unsigned char fh_pre_saved; /* pre-op attrs saved */ | |
147 | ||
148 | /* Pre-op attributes saved during fh_lock */ | |
149 | __u64 fh_pre_size; /* size before operation */ | |
150 | struct timespec fh_pre_mtime; /* mtime before oper */ | |
151 | struct timespec fh_pre_ctime; /* ctime before oper */ | |
152 | ||
153 | /* Post-op attributes saved in fh_unlock */ | |
154 | umode_t fh_post_mode; /* i_mode */ | |
155 | nlink_t fh_post_nlink; /* i_nlink */ | |
156 | uid_t fh_post_uid; /* i_uid */ | |
157 | gid_t fh_post_gid; /* i_gid */ | |
158 | __u64 fh_post_size; /* i_size */ | |
159 | unsigned long fh_post_blocks; /* i_blocks */ | |
160 | unsigned long fh_post_blksize;/* i_blksize */ | |
161 | __u32 fh_post_rdev[2];/* i_rdev */ | |
162 | struct timespec fh_post_atime; /* i_atime */ | |
163 | struct timespec fh_post_mtime; /* i_mtime */ | |
164 | struct timespec fh_post_ctime; /* i_ctime */ | |
165 | #endif /* CONFIG_NFSD_V3 */ | |
166 | ||
167 | } svc_fh; | |
168 | ||
169 | static inline void mk_fsid_v0(u32 *fsidv, dev_t dev, ino_t ino) | |
170 | { | |
171 | fsidv[0] = htonl((MAJOR(dev)<<16) | | |
172 | MINOR(dev)); | |
173 | fsidv[1] = ino_t_to_u32(ino); | |
174 | } | |
175 | ||
176 | static inline void mk_fsid_v1(u32 *fsidv, u32 fsid) | |
177 | { | |
178 | fsidv[0] = fsid; | |
179 | } | |
180 | ||
181 | static inline void mk_fsid_v2(u32 *fsidv, dev_t dev, ino_t ino) | |
182 | { | |
183 | fsidv[0] = htonl(MAJOR(dev)); | |
184 | fsidv[1] = htonl(MINOR(dev)); | |
185 | fsidv[2] = ino_t_to_u32(ino); | |
186 | } | |
187 | ||
188 | static inline void mk_fsid_v3(u32 *fsidv, dev_t dev, ino_t ino) | |
189 | { | |
190 | fsidv[0] = new_encode_dev(dev); | |
191 | fsidv[1] = ino_t_to_u32(ino); | |
192 | } | |
193 | ||
194 | static inline int key_len(int type) | |
195 | { | |
196 | switch(type) { | |
197 | case 0: return 8; | |
198 | case 1: return 4; | |
199 | case 2: return 12; | |
200 | case 3: return 8; | |
201 | default: return 0; | |
202 | } | |
203 | } | |
204 | ||
205 | /* | |
206 | * Shorthand for dprintk()'s | |
207 | */ | |
208 | extern char * SVCFH_fmt(struct svc_fh *fhp); | |
209 | ||
210 | /* | |
211 | * Function prototypes | |
212 | */ | |
213 | u32 fh_verify(struct svc_rqst *, struct svc_fh *, int, int); | |
214 | int fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *); | |
215 | int fh_update(struct svc_fh *); | |
216 | void fh_put(struct svc_fh *); | |
217 | ||
218 | static __inline__ struct svc_fh * | |
219 | fh_copy(struct svc_fh *dst, struct svc_fh *src) | |
220 | { | |
221 | if (src->fh_dentry || src->fh_locked) { | |
222 | struct dentry *dentry = src->fh_dentry; | |
223 | printk(KERN_ERR "fh_copy: copying %s/%s, already verified!\n", | |
224 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
225 | } | |
226 | ||
227 | *dst = *src; | |
228 | return dst; | |
229 | } | |
230 | ||
231 | static __inline__ struct svc_fh * | |
232 | fh_init(struct svc_fh *fhp, int maxsize) | |
233 | { | |
234 | memset(fhp, 0, sizeof(*fhp)); | |
235 | fhp->fh_maxsize = maxsize; | |
236 | return fhp; | |
237 | } | |
238 | ||
239 | #ifdef CONFIG_NFSD_V3 | |
240 | /* | |
241 | * Fill in the pre_op attr for the wcc data | |
242 | */ | |
243 | static inline void | |
244 | fill_pre_wcc(struct svc_fh *fhp) | |
245 | { | |
246 | struct inode *inode; | |
247 | ||
248 | inode = fhp->fh_dentry->d_inode; | |
249 | if (!fhp->fh_pre_saved) { | |
250 | fhp->fh_pre_mtime = inode->i_mtime; | |
251 | fhp->fh_pre_ctime = inode->i_ctime; | |
252 | fhp->fh_pre_size = inode->i_size; | |
253 | fhp->fh_pre_saved = 1; | |
254 | } | |
255 | } | |
256 | ||
257 | /* | |
258 | * Fill in the post_op attr for the wcc data | |
259 | */ | |
260 | static inline void | |
261 | fill_post_wcc(struct svc_fh *fhp) | |
262 | { | |
263 | struct inode *inode = fhp->fh_dentry->d_inode; | |
264 | ||
265 | if (fhp->fh_post_saved) | |
266 | printk("nfsd: inode locked twice during operation.\n"); | |
267 | ||
268 | fhp->fh_post_mode = inode->i_mode; | |
269 | fhp->fh_post_nlink = inode->i_nlink; | |
270 | fhp->fh_post_uid = inode->i_uid; | |
271 | fhp->fh_post_gid = inode->i_gid; | |
272 | fhp->fh_post_size = inode->i_size; | |
273 | if (inode->i_blksize) { | |
274 | fhp->fh_post_blksize = inode->i_blksize; | |
275 | fhp->fh_post_blocks = inode->i_blocks; | |
276 | } else { | |
277 | fhp->fh_post_blksize = BLOCK_SIZE; | |
278 | /* how much do we care for accuracy with MinixFS? */ | |
279 | fhp->fh_post_blocks = (inode->i_size+511) >> 9; | |
280 | } | |
281 | fhp->fh_post_rdev[0] = htonl((u32)imajor(inode)); | |
282 | fhp->fh_post_rdev[1] = htonl((u32)iminor(inode)); | |
283 | fhp->fh_post_atime = inode->i_atime; | |
284 | fhp->fh_post_mtime = inode->i_mtime; | |
285 | fhp->fh_post_ctime = inode->i_ctime; | |
286 | fhp->fh_post_saved = 1; | |
287 | } | |
288 | #else | |
289 | #define fill_pre_wcc(ignored) | |
290 | #define fill_post_wcc(notused) | |
291 | #endif /* CONFIG_NFSD_V3 */ | |
292 | ||
293 | ||
294 | /* | |
295 | * Lock a file handle/inode | |
296 | * NOTE: both fh_lock and fh_unlock are done "by hand" in | |
1b1dcc1b | 297 | * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once |
1da177e4 LT |
298 | * so, any changes here should be reflected there. |
299 | */ | |
300 | static inline void | |
301 | fh_lock(struct svc_fh *fhp) | |
302 | { | |
303 | struct dentry *dentry = fhp->fh_dentry; | |
304 | struct inode *inode; | |
305 | ||
306 | dfprintk(FILEOP, "nfsd: fh_lock(%s) locked = %d\n", | |
307 | SVCFH_fmt(fhp), fhp->fh_locked); | |
308 | ||
309 | if (!fhp->fh_dentry) { | |
310 | printk(KERN_ERR "fh_lock: fh not verified!\n"); | |
311 | return; | |
312 | } | |
313 | if (fhp->fh_locked) { | |
314 | printk(KERN_WARNING "fh_lock: %s/%s already locked!\n", | |
315 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
316 | return; | |
317 | } | |
318 | ||
319 | inode = dentry->d_inode; | |
1b1dcc1b | 320 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
321 | fill_pre_wcc(fhp); |
322 | fhp->fh_locked = 1; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Unlock a file handle/inode | |
327 | */ | |
328 | static inline void | |
329 | fh_unlock(struct svc_fh *fhp) | |
330 | { | |
331 | if (!fhp->fh_dentry) | |
332 | printk(KERN_ERR "fh_unlock: fh not verified!\n"); | |
333 | ||
334 | if (fhp->fh_locked) { | |
335 | fill_post_wcc(fhp); | |
1b1dcc1b | 336 | mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex); |
1da177e4 LT |
337 | fhp->fh_locked = 0; |
338 | } | |
339 | } | |
340 | #endif /* __KERNEL__ */ | |
341 | ||
342 | ||
343 | #endif /* _LINUX_NFSD_FH_H */ |