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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/* 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 * Fill in the pre_op attr for the wcc data
137 */
138static inline void
139fill_pre_wcc(struct svc_fh *fhp)
140{
141 struct inode *inode;
142
143 inode = fhp->fh_dentry->d_inode;
144 if (!fhp->fh_pre_saved) {
145 fhp->fh_pre_mtime = inode->i_mtime;
146 fhp->fh_pre_ctime = inode->i_ctime;
147 fhp->fh_pre_size = inode->i_size;
148 fhp->fh_pre_change = inode->i_version;
149 fhp->fh_pre_saved = 1;
150 }
151}
152
153extern void fill_post_wcc(struct svc_fh *);
154#else
155#define fill_pre_wcc(ignored)
156#define fill_post_wcc(notused)
157#endif /* CONFIG_NFSD_V3 */
158
159
160/*
161 * Lock a file handle/inode
162 * NOTE: both fh_lock and fh_unlock are done "by hand" in
163 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
164 * so, any changes here should be reflected there.
165 */
166
167static inline void
168fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
169{
170 struct dentry *dentry = fhp->fh_dentry;
171 struct inode *inode;
172
173 BUG_ON(!dentry);
174
175 if (fhp->fh_locked) {
176 printk(KERN_WARNING "fh_lock: %s/%s already locked!\n",
177 dentry->d_parent->d_name.name, dentry->d_name.name);
178 return;
179 }
180
181 inode = dentry->d_inode;
182 mutex_lock_nested(&inode->i_mutex, subclass);
183 fill_pre_wcc(fhp);
184 fhp->fh_locked = 1;
185}
186
187static inline void
188fh_lock(struct svc_fh *fhp)
189{
190 fh_lock_nested(fhp, I_MUTEX_NORMAL);
191}
192
193/*
194 * Unlock a file handle/inode
195 */
196static inline void
197fh_unlock(struct svc_fh *fhp)
198{
199 if (fhp->fh_locked) {
200 fill_post_wcc(fhp);
201 mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
202 fhp->fh_locked = 0;
203 }
204}
205
206#endif /* _LINUX_NFSD_FH_INT_H */