Root/fs/nfsd/nfsfh.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 *, int, 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 */
207

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