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Christoph Hellwig9c69de42014-05-06 19:37:13 +02001/*
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
J. Bruce Fields1557aca2009-12-04 19:36:06 -05009
Christoph Hellwig9c69de42014-05-06 19:37:13 +020010#include <linux/sunrpc/svc.h>
11#include <uapi/linux/nfsd/nfsfh.h>
J. Bruce Fields1557aca2009-12-04 19:36:06 -050012
Christoph Hellwig9c69de42014-05-06 19:37:13 +020013static inline __u32 ino_t_to_u32(ino_t ino)
14{
15 return (__u32) ino;
16}
17
18static 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 */
27typedef 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;
J. Bruce Fields1557aca2009-12-04 19:36:06 -050056
57enum 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
68enum fsid_source {
69 FSIDSOURCE_DEV,
70 FSIDSOURCE_FSID,
71 FSIDSOURCE_UUID,
72};
73extern enum fsid_source fsid_source(struct svc_fh *fhp);
74
75
Jeff Layton94ec9382014-06-17 07:44:14 -040076/*
77 * This might look a little large to "inline" but in all calls except
J. Bruce Fields1557aca2009-12-04 19:36:06 -050078 * one, 'vers' is constant so moste of the function disappears.
Jeff Layton94ec9382014-06-17 07:44:14 -040079 *
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.
J. Bruce Fields1557aca2009-12-04 19:36:06 -050085 */
86static 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:
Jeff Layton94ec9382014-06-17 07:44:14 -040092 fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) |
J. Bruce Fields1557aca2009-12-04 19:36:06 -050093 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:
Jeff Layton94ec9382014-06-17 07:44:14 -0400100 fsidv[0] = (__force __u32)htonl(MAJOR(dev));
101 fsidv[1] = (__force __u32)htonl(MINOR(dev));
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500102 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
138static 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 */
156extern char * SVCFH_fmt(struct svc_fh *fhp);
157
158/*
159 * Function prototypes
160 */
Al Viro175a4eb2011-07-26 03:30:54 -0400161__be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500162__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
163__be32 fh_update(struct svc_fh *);
164void fh_put(struct svc_fh *);
165
166static __inline__ struct svc_fh *
167fh_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
175static inline void
176fh_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
182static __inline__ struct svc_fh *
183fh_init(struct svc_fh *fhp, int maxsize)
184{
185 memset(fhp, 0, sizeof(*fhp));
186 fhp->fh_maxsize = maxsize;
187 return fhp;
188}
189
Christoph Hellwig4d94c2e2014-08-14 08:41:48 +0200190static 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
Christoph Hellwig9558f252014-08-13 20:56:13 +0200199static 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;
Dan Carpenter0ab39de2015-02-11 16:08:32 +0300203 if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0)
Christoph Hellwig9558f252014-08-13 20:56:13 +0200204 return false;
205 return true;
206}
207
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500208#ifdef CONFIG_NFSD_V3
209/*
Kinglong Mee23367452014-03-29 10:23:47 +0800210 * The wcc data stored in current_fh should be cleared
211 * between compound ops.
212 */
213static inline void
214fh_clear_wcc(struct svc_fh *fhp)
215{
216 fhp->fh_post_saved = 0;
217 fhp->fh_pre_saved = 0;
218}
219
220/*
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500221 * Fill in the pre_op attr for the wcc data
222 */
223static inline void
224fill_pre_wcc(struct svc_fh *fhp)
225{
226 struct inode *inode;
227
David Howells2b0143b2015-03-17 22:25:59 +0000228 inode = d_inode(fhp->fh_dentry);
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500229 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
238extern void fill_post_wcc(struct svc_fh *);
239#else
Kinglong Mee23367452014-03-29 10:23:47 +0800240#define fh_clear_wcc(ignored)
241#define fill_pre_wcc(ignored)
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500242#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
253static inline void
254fh_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) {
Al Viroa6a9f182013-09-16 10:57:01 -0400262 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
263 dentry);
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500264 return;
265 }
266
David Howells2b0143b2015-03-17 22:25:59 +0000267 inode = d_inode(dentry);
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500268 mutex_lock_nested(&inode->i_mutex, subclass);
269 fill_pre_wcc(fhp);
270 fhp->fh_locked = 1;
271}
272
273static inline void
274fh_lock(struct svc_fh *fhp)
275{
276 fh_lock_nested(fhp, I_MUTEX_NORMAL);
277}
278
279/*
280 * Unlock a file handle/inode
281 */
282static inline void
283fh_unlock(struct svc_fh *fhp)
284{
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500285 if (fhp->fh_locked) {
286 fill_post_wcc(fhp);
David Howells2b0143b2015-03-17 22:25:59 +0000287 mutex_unlock(&d_inode(fhp->fh_dentry)->i_mutex);
J. Bruce Fields1557aca2009-12-04 19:36:06 -0500288 fhp->fh_locked = 0;
289 }
290}
291
Christoph Hellwig9c69de42014-05-06 19:37:13 +0200292#endif /* _LINUX_NFSD_NFSFH_H */