[net-next-2.6.git] / fs / nfsd / nfsfh.h

/* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */

#ifndef _LINUX_NFSD_FH_INT_H
#define _LINUX_NFSD_FH_INT_H

#include <linux/nfsd/nfsfh.h>

enum nfsd_fsid {
	FSID_DEV = 0,
	FSID_NUM,
	FSID_MAJOR_MINOR,
	FSID_ENCODE_DEV,
	FSID_UUID4_INUM,
	FSID_UUID8,
	FSID_UUID16,
	FSID_UUID16_INUM,
};

enum fsid_source {
	FSIDSOURCE_DEV,
	FSIDSOURCE_FSID,
	FSIDSOURCE_UUID,
};
extern enum fsid_source fsid_source(struct svc_fh *fhp);


/* This might look a little large to "inline" but in all calls except
 * one, 'vers' is constant so moste of the function disappears.
 */
static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
			   u32 fsid, unsigned char *uuid)
{
	u32 *up;
	switch(vers) {
	case FSID_DEV:
		fsidv[0] = htonl((MAJOR(dev)<<16) |
				 MINOR(dev));
		fsidv[1] = ino_t_to_u32(ino);
		break;
	case FSID_NUM:
		fsidv[0] = fsid;
		break;
	case FSID_MAJOR_MINOR:
		fsidv[0] = htonl(MAJOR(dev));
		fsidv[1] = htonl(MINOR(dev));
		fsidv[2] = ino_t_to_u32(ino);
		break;

	case FSID_ENCODE_DEV:
		fsidv[0] = new_encode_dev(dev);
		fsidv[1] = ino_t_to_u32(ino);
		break;

	case FSID_UUID4_INUM:
		/* 4 byte fsid and inode number */
		up = (u32*)uuid;
		fsidv[0] = ino_t_to_u32(ino);
		fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
		break;

	case FSID_UUID8:
		/* 8 byte fsid  */
		up = (u32*)uuid;
		fsidv[0] = up[0] ^ up[2];
		fsidv[1] = up[1] ^ up[3];
		break;

	case FSID_UUID16:
		/* 16 byte fsid - NFSv3+ only */
		memcpy(fsidv, uuid, 16);
		break;

	case FSID_UUID16_INUM:
		/* 8 byte inode and 16 byte fsid */
		*(u64*)fsidv = (u64)ino;
		memcpy(fsidv+2, uuid, 16);
		break;
	default: BUG();
	}
}

static inline int key_len(int type)
{
	switch(type) {
	case FSID_DEV:		return 8;
	case FSID_NUM: 		return 4;
	case FSID_MAJOR_MINOR:	return 12;
	case FSID_ENCODE_DEV:	return 8;
	case FSID_UUID4_INUM:	return 8;
	case FSID_UUID8:	return 8;
	case FSID_UUID16:	return 16;
	case FSID_UUID16_INUM:	return 24;
	default: return 0;
	}
}

/*
 * Shorthand for dprintk()'s
 */
extern char * SVCFH_fmt(struct svc_fh *fhp);

/*
 * Function prototypes
 */
__be32	fh_verify(struct svc_rqst *, struct svc_fh *, int, int);
__be32	fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
__be32	fh_update(struct svc_fh *);
void	fh_put(struct svc_fh *);

static __inline__ struct svc_fh *
fh_copy(struct svc_fh *dst, struct svc_fh *src)
{
	WARN_ON(src->fh_dentry || src->fh_locked);
			
	*dst = *src;
	return dst;
}

static inline void
fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
{
	dst->fh_size = src->fh_size;
	memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
}

static __inline__ struct svc_fh *
fh_init(struct svc_fh *fhp, int maxsize)
{
	memset(fhp, 0, sizeof(*fhp));
	fhp->fh_maxsize = maxsize;
	return fhp;
}

#ifdef CONFIG_NFSD_V3
/*
 * Fill in the pre_op attr for the wcc data
 */
static inline void
fill_pre_wcc(struct svc_fh *fhp)
{
	struct inode    *inode;

	inode = fhp->fh_dentry->d_inode;
	if (!fhp->fh_pre_saved) {
		fhp->fh_pre_mtime = inode->i_mtime;
		fhp->fh_pre_ctime = inode->i_ctime;
		fhp->fh_pre_size  = inode->i_size;
		fhp->fh_pre_change = inode->i_version;
		fhp->fh_pre_saved = 1;
	}
}

extern void fill_post_wcc(struct svc_fh *);
#else
#define	fill_pre_wcc(ignored)
#define fill_post_wcc(notused)
#endif /* CONFIG_NFSD_V3 */


/*
 * Lock a file handle/inode
 * NOTE: both fh_lock and fh_unlock are done "by hand" in
 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
 * so, any changes here should be reflected there.
 */

static inline void
fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
{
	struct dentry	*dentry = fhp->fh_dentry;
	struct inode	*inode;

	BUG_ON(!dentry);

	if (fhp->fh_locked) {
		printk(KERN_WARNING "fh_lock: %s/%s already locked!\n",
			dentry->d_parent->d_name.name, dentry->d_name.name);
		return;
	}

	inode = dentry->d_inode;
	mutex_lock_nested(&inode->i_mutex, subclass);
	fill_pre_wcc(fhp);
	fhp->fh_locked = 1;
}

static inline void
fh_lock(struct svc_fh *fhp)
{
	fh_lock_nested(fhp, I_MUTEX_NORMAL);
}

/*
 * Unlock a file handle/inode
 */
static inline void
fh_unlock(struct svc_fh *fhp)
{
	if (fhp->fh_locked) {
		fill_post_wcc(fhp);
		mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
		fhp->fh_locked = 0;
	}
}

#endif /* _LINUX_NFSD_FH_INT_H */
Commit	Line	Data
1557aca7 BF	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
	8	enum 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
	19	enum fsid_source {
	20	FSIDSOURCE_DEV,
	21	FSIDSOURCE_FSID,
	22	FSIDSOURCE_UUID,
	23	};
	24	extern 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	*/
	30	static 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
82	static 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	*/
100	extern 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 *);
108	void fh_put(struct svc_fh *);
109
110	static __inline__ struct svc_fh *
111	fh_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
119	static inline void
120	fh_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
126	static __inline__ struct svc_fh *
127	fh_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	*/
138	static inline void
139	fill_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
153	extern 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
167	static inline void
168	fh_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
187	static inline void
188	fh_lock(struct svc_fh *fhp)
189	{
190	fh_lock_nested(fhp, I_MUTEX_NORMAL);
191	}
192
193	/*
194	* Unlock a file handle/inode
195	*/
196	static inline void
197	fh_unlock(struct svc_fh *fhp)
198	{
1557aca7 BF	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 */