1 /* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
3 #ifndef _LINUX_NFSD_FH_INT_H
4 #define _LINUX_NFSD_FH_INT_H
6 #include <linux/nfsd/nfsfh.h>
24 extern enum fsid_source fsid_source(struct svc_fh *fhp);
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.
30 static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
31 u32 fsid, unsigned char *uuid)
36 fsidv[0] = htonl((MAJOR(dev)<<16) |
38 fsidv[1] = ino_t_to_u32(ino);
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);
50 fsidv[0] = new_encode_dev(dev);
51 fsidv[1] = ino_t_to_u32(ino);
55 /* 4 byte fsid and inode number */
57 fsidv[0] = ino_t_to_u32(ino);
58 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
64 fsidv[0] = up[0] ^ up[2];
65 fsidv[1] = up[1] ^ up[3];
69 /* 16 byte fsid - NFSv3+ only */
70 memcpy(fsidv, uuid, 16);
73 case FSID_UUID16_INUM:
74 /* 8 byte inode and 16 byte fsid */
75 *(u64*)fsidv = (u64)ino;
76 memcpy(fsidv+2, uuid, 16);
82 static inline int key_len(int 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;
98 * Shorthand for dprintk()'s
100 extern char * SVCFH_fmt(struct svc_fh *fhp);
103 * Function prototypes
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 *);
108 void fh_put(struct svc_fh *);
110 static __inline__ struct svc_fh *
111 fh_copy(struct svc_fh *dst, struct svc_fh *src)
113 WARN_ON(src->fh_dentry || src->fh_locked);
120 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
122 dst->fh_size = src->fh_size;
123 memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
126 static __inline__ struct svc_fh *
127 fh_init(struct svc_fh *fhp, int maxsize)
129 memset(fhp, 0, sizeof(*fhp));
130 fhp->fh_maxsize = maxsize;
134 #ifdef CONFIG_NFSD_V3
136 * Fill in the pre_op attr for the wcc data
139 fill_pre_wcc(struct svc_fh *fhp)
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;
153 extern void fill_post_wcc(struct svc_fh *);
155 #define fill_pre_wcc(ignored)
156 #define fill_post_wcc(notused)
157 #endif /* CONFIG_NFSD_V3 */
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.
168 fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
170 struct dentry *dentry = fhp->fh_dentry;
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);
181 inode = dentry->d_inode;
182 mutex_lock_nested(&inode->i_mutex, subclass);
188 fh_lock(struct svc_fh *fhp)
190 fh_lock_nested(fhp, I_MUTEX_NORMAL);
194 * Unlock a file handle/inode
197 fh_unlock(struct svc_fh *fhp)
199 if (fhp->fh_locked) {
201 mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
206 #endif /* _LINUX_NFSD_FH_INT_H */