Loading...
1/* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
2
3#ifndef _LINUX_NFSD_FH_INT_H
4#define _LINUX_NFSD_FH_INT_H
5
6#include <linux/nfsd/nfsfh.h>
7
8enum nfsd_fsid {
9 FSID_DEV = 0,
10 FSID_NUM,
11 FSID_MAJOR_MINOR,
12 FSID_ENCODE_DEV,
13 FSID_UUID4_INUM,
14 FSID_UUID8,
15 FSID_UUID16,
16 FSID_UUID16_INUM,
17};
18
19enum fsid_source {
20 FSIDSOURCE_DEV,
21 FSIDSOURCE_FSID,
22 FSIDSOURCE_UUID,
23};
24extern enum fsid_source fsid_source(struct svc_fh *fhp);
25
26
27/* This might look a little large to "inline" but in all calls except
28 * one, 'vers' is constant so moste of the function disappears.
29 */
30static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
31 u32 fsid, unsigned char *uuid)
32{
33 u32 *up;
34 switch(vers) {
35 case FSID_DEV:
36 fsidv[0] = htonl((MAJOR(dev)<<16) |
37 MINOR(dev));
38 fsidv[1] = ino_t_to_u32(ino);
39 break;
40 case FSID_NUM:
41 fsidv[0] = fsid;
42 break;
43 case FSID_MAJOR_MINOR:
44 fsidv[0] = htonl(MAJOR(dev));
45 fsidv[1] = htonl(MINOR(dev));
46 fsidv[2] = ino_t_to_u32(ino);
47 break;
48
49 case FSID_ENCODE_DEV:
50 fsidv[0] = new_encode_dev(dev);
51 fsidv[1] = ino_t_to_u32(ino);
52 break;
53
54 case FSID_UUID4_INUM:
55 /* 4 byte fsid and inode number */
56 up = (u32*)uuid;
57 fsidv[0] = ino_t_to_u32(ino);
58 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
59 break;
60
61 case FSID_UUID8:
62 /* 8 byte fsid */
63 up = (u32*)uuid;
64 fsidv[0] = up[0] ^ up[2];
65 fsidv[1] = up[1] ^ up[3];
66 break;
67
68 case FSID_UUID16:
69 /* 16 byte fsid - NFSv3+ only */
70 memcpy(fsidv, uuid, 16);
71 break;
72
73 case FSID_UUID16_INUM:
74 /* 8 byte inode and 16 byte fsid */
75 *(u64*)fsidv = (u64)ino;
76 memcpy(fsidv+2, uuid, 16);
77 break;
78 default: BUG();
79 }
80}
81
82static inline int key_len(int type)
83{
84 switch(type) {
85 case FSID_DEV: return 8;
86 case FSID_NUM: return 4;
87 case FSID_MAJOR_MINOR: return 12;
88 case FSID_ENCODE_DEV: return 8;
89 case FSID_UUID4_INUM: return 8;
90 case FSID_UUID8: return 8;
91 case FSID_UUID16: return 16;
92 case FSID_UUID16_INUM: return 24;
93 default: return 0;
94 }
95}
96
97/*
98 * Shorthand for dprintk()'s
99 */
100extern char * SVCFH_fmt(struct svc_fh *fhp);
101
102/*
103 * Function prototypes
104 */
105__be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
106__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
107__be32 fh_update(struct svc_fh *);
108void fh_put(struct svc_fh *);
109
110static __inline__ struct svc_fh *
111fh_copy(struct svc_fh *dst, struct svc_fh *src)
112{
113 WARN_ON(src->fh_dentry || src->fh_locked);
114
115 *dst = *src;
116 return dst;
117}
118
119static inline void
120fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
121{
122 dst->fh_size = src->fh_size;
123 memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
124}
125
126static __inline__ struct svc_fh *
127fh_init(struct svc_fh *fhp, int maxsize)
128{
129 memset(fhp, 0, sizeof(*fhp));
130 fhp->fh_maxsize = maxsize;
131 return fhp;
132}
133
134#ifdef CONFIG_NFSD_V3
135/*
136 * The wcc data stored in current_fh should be cleared
137 * between compound ops.
138 */
139static inline void
140fh_clear_wcc(struct svc_fh *fhp)
141{
142 fhp->fh_post_saved = 0;
143 fhp->fh_pre_saved = 0;
144}
145
146/*
147 * Fill in the pre_op attr for the wcc data
148 */
149static inline void
150fill_pre_wcc(struct svc_fh *fhp)
151{
152 struct inode *inode;
153
154 inode = fhp->fh_dentry->d_inode;
155 if (!fhp->fh_pre_saved) {
156 fhp->fh_pre_mtime = inode->i_mtime;
157 fhp->fh_pre_ctime = inode->i_ctime;
158 fhp->fh_pre_size = inode->i_size;
159 fhp->fh_pre_change = inode->i_version;
160 fhp->fh_pre_saved = 1;
161 }
162}
163
164extern void fill_post_wcc(struct svc_fh *);
165#else
166#define fh_clear_wcc(ignored)
167#define fill_pre_wcc(ignored)
168#define fill_post_wcc(notused)
169#endif /* CONFIG_NFSD_V3 */
170
171
172/*
173 * Lock a file handle/inode
174 * NOTE: both fh_lock and fh_unlock are done "by hand" in
175 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
176 * so, any changes here should be reflected there.
177 */
178
179static inline void
180fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
181{
182 struct dentry *dentry = fhp->fh_dentry;
183 struct inode *inode;
184
185 BUG_ON(!dentry);
186
187 if (fhp->fh_locked) {
188 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
189 dentry);
190 return;
191 }
192
193 inode = dentry->d_inode;
194 mutex_lock_nested(&inode->i_mutex, subclass);
195 fill_pre_wcc(fhp);
196 fhp->fh_locked = 1;
197}
198
199static inline void
200fh_lock(struct svc_fh *fhp)
201{
202 fh_lock_nested(fhp, I_MUTEX_NORMAL);
203}
204
205/*
206 * Unlock a file handle/inode
207 */
208static inline void
209fh_unlock(struct svc_fh *fhp)
210{
211 if (fhp->fh_locked) {
212 fill_post_wcc(fhp);
213 mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
214 fhp->fh_locked = 0;
215 }
216}
217
218#endif /* _LINUX_NFSD_FH_INT_H */
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
14static inline __u32 ino_t_to_u32(ino_t ino)
15{
16 return (__u32) ino;
17}
18
19static 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 */
28typedef 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
58enum 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
69enum fsid_source {
70 FSIDSOURCE_DEV,
71 FSIDSOURCE_FSID,
72 FSIDSOURCE_UUID,
73};
74extern 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 */
87static 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
139static 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 */
157extern 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 *);
165void fh_put(struct svc_fh *);
166
167static __inline__ struct svc_fh *
168fh_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
176static inline void
177fh_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
183static __inline__ struct svc_fh *
184fh_init(struct svc_fh *fhp, int maxsize)
185{
186 memset(fhp, 0, sizeof(*fhp));
187 fhp->fh_maxsize = maxsize;
188 return fhp;
189}
190
191static 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
200static 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
218static inline u32
219knfsd_fh_hash(struct knfsd_fh *fh)
220{
221 return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
222}
223#else
224static inline u32
225knfsd_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 */
236static inline void
237fh_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 */
246static inline void
247fill_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
261extern 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
276static inline void
277fh_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
296static inline void
297fh_lock(struct svc_fh *fhp)
298{
299 fh_lock_nested(fhp, I_MUTEX_NORMAL);
300}
301
302/*
303 * Unlock a file handle/inode
304 */
305static inline void
306fh_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 */