[deliverable/linux.git] / fs / nfsd / nfsfh.h

/*
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 *
 * This file describes the layout of the file handles as passed
 * over the wire.
 */
#ifndef _LINUX_NFSD_NFSFH_H
#define _LINUX_NFSD_NFSFH_H

#include <linux/sunrpc/svc.h>
#include <uapi/linux/nfsd/nfsfh.h>

static inline __u32 ino_t_to_u32(ino_t ino)
{
	return (__u32) ino;
}

static inline ino_t u32_to_ino_t(__u32 uino)
{
	return (ino_t) uino;
}

/*
 * This is the internal representation of an NFS handle used in knfsd.
 * pre_mtime/post_version will be used to support wcc_attr's in NFSv3.
 */
typedef struct svc_fh {
	struct knfsd_fh		fh_handle;	/* FH data */
	struct dentry *		fh_dentry;	/* validated dentry */
	struct svc_export *	fh_export;	/* export pointer */
	int			fh_maxsize;	/* max size for fh_handle */

	unsigned char		fh_locked;	/* inode locked by us */
	unsigned char		fh_want_write;	/* remount protection taken */

#ifdef CONFIG_NFSD_V3
	unsigned char		fh_post_saved;	/* post-op attrs saved */
	unsigned char		fh_pre_saved;	/* pre-op attrs saved */

	/* Pre-op attributes saved during fh_lock */
	__u64			fh_pre_size;	/* size before operation */
	struct timespec		fh_pre_mtime;	/* mtime before oper */
	struct timespec		fh_pre_ctime;	/* ctime before oper */
	/*
	 * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
	 *  to find out if it is valid.
	 */
	u64			fh_pre_change;

	/* Post-op attributes saved in fh_unlock */
	struct kstat		fh_post_attr;	/* full attrs after operation */
	u64			fh_post_change; /* nfsv4 change; see above */
#endif /* CONFIG_NFSD_V3 */

} svc_fh;

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.
 *
 * In some cases the values are considered to be host endian and in
 * others, net endian. fsidv is always considered to be u32 as the
 * callers don't know which it will be. So we must use __force to keep
 * sparse from complaining. Since these values are opaque to the
 * client, that shouldn't be a problem.
 */
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] = (__force __u32)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] = (__force __u32)htonl(MAJOR(dev));
		fsidv[1] = (__force __u32)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 *, umode_t, 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;
}

static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
{
	if (fh1->fh_size != fh2->fh_size)
		return false;
	if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
		return false;
	return true;
}

#ifdef CONFIG_NFSD_V3
/*
 * The wcc data stored in current_fh should be cleared
 * between compound ops.
 */
static inline void
fh_clear_wcc(struct svc_fh *fhp)
{
	fhp->fh_post_saved = 0;
	fhp->fh_pre_saved = 0;
}

/*
 * 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 fh_clear_wcc(ignored)
#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: %pd2 already locked!\n",
			dentry);
		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_NFSFH_H */
Commit	Line	Data
9c69de4c CH	1	/*
	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
	9
	10	#include <linux/sunrpc/svc.h>
	11	#include <uapi/linux/nfsd/nfsfh.h>
	12
	13	static inline __u32 ino_t_to_u32(ino_t ino)
	14	{
	15	return (__u32) ino;
	16	}
	17
	18	static inline ino_t u32_to_ino_t(__u32 uino)
	19	{
	20	return (ino_t) uino;
	21	}
1557aca7	22
9c69de4c CH	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	*/
	27	typedef 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 */
1557aca7	54
9c69de4c	55	} svc_fh;
1557aca7 BF	56
	57	enum 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
	68	enum fsid_source {
	69	FSIDSOURCE_DEV,
	70	FSIDSOURCE_FSID,
	71	FSIDSOURCE_UUID,
	72	};
	73	extern enum fsid_source fsid_source(struct svc_fh *fhp);
	74
	75
94ec938b JL	76	/*
94ec938b JL	77	* This might look a little large to "inline" but in all calls except
1557aca7	78	* one, 'vers' is constant so moste of the function disappears.
94ec938b JL	79	*
	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.
1557aca7 BF	85	*/
	86	static 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:
94ec938b	92	fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) \|
1557aca7 BF	93	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:
94ec938b JL	100	fsidv[0] = (__force __u32)htonl(MAJOR(dev));
94ec938b JL	101	fsidv[1] = (__force __u32)htonl(MINOR(dev));
1557aca7 BF	102	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
	138	static 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	*/
	156	extern char * SVCFH_fmt(struct svc_fh *fhp);
	157
	158	/*
	159	* Function prototypes
	160	*/
175a4eb7	161	__be32 fh_verify(struct svc_rqst , struct svc_fh , umode_t, int);
1557aca7 BF	162	__be32 fh_compose(struct svc_fh , struct svc_export , struct dentry , struct svc_fh );
	163	__be32 fh_update(struct svc_fh *);
	164	void fh_put(struct svc_fh *);
	165
	166	static __inline__ struct svc_fh *
	167	fh_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
	175	static inline void
	176	fh_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
	182	static __inline__ struct svc_fh *
	183	fh_init(struct svc_fh *fhp, int maxsize)
	184	{
	185	memset(fhp, 0, sizeof(*fhp));
	186	fhp->fh_maxsize = maxsize;
	187	return fhp;
	188	}
	189
4d94c2ef CH	190	static 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
1557aca7	199	#ifdef CONFIG_NFSD_V3
2336745e KM	200	/*
	201	* The wcc data stored in current_fh should be cleared
	202	* between compound ops.
	203	*/
	204	static inline void
	205	fh_clear_wcc(struct svc_fh *fhp)
	206	{
	207	fhp->fh_post_saved = 0;
	208	fhp->fh_pre_saved = 0;
	209	}
	210
1557aca7 BF	211	/*
	212	* Fill in the pre_op attr for the wcc data
	213	*/
	214	static inline void
	215	fill_pre_wcc(struct svc_fh *fhp)
	216	{
	217	struct inode *inode;
	218
	219	inode = fhp->fh_dentry->d_inode;
	220	if (!fhp->fh_pre_saved) {
	221	fhp->fh_pre_mtime = inode->i_mtime;
	222	fhp->fh_pre_ctime = inode->i_ctime;
	223	fhp->fh_pre_size = inode->i_size;
	224	fhp->fh_pre_change = inode->i_version;
	225	fhp->fh_pre_saved = 1;
	226	}
	227	}
	228
	229	extern void fill_post_wcc(struct svc_fh *);
	230	#else
2336745e KM	231	#define fh_clear_wcc(ignored)
2336745e KM	232	#define fill_pre_wcc(ignored)
1557aca7 BF	233	#define fill_post_wcc(notused)
	234	#endif /* CONFIG_NFSD_V3 */
	235
	236
	237	/*
	238	* Lock a file handle/inode
	239	* NOTE: both fh_lock and fh_unlock are done "by hand" in
	240	* vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
	241	* so, any changes here should be reflected there.
	242	*/
	243
	244	static inline void
	245	fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
	246	{
	247	struct dentry *dentry = fhp->fh_dentry;
	248	struct inode *inode;
	249
	250	BUG_ON(!dentry);
	251
	252	if (fhp->fh_locked) {
a6a9f18f AV	253	printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
a6a9f18f AV	254	dentry);
1557aca7 BF	255	return;
	256	}
	257
	258	inode = dentry->d_inode;
	259	mutex_lock_nested(&inode->i_mutex, subclass);
	260	fill_pre_wcc(fhp);
	261	fhp->fh_locked = 1;
	262	}
	263
	264	static inline void
	265	fh_lock(struct svc_fh *fhp)
	266	{
	267	fh_lock_nested(fhp, I_MUTEX_NORMAL);
	268	}
	269
	270	/*
	271	* Unlock a file handle/inode
	272	*/
	273	static inline void
	274	fh_unlock(struct svc_fh *fhp)
	275	{
1557aca7 BF	276	if (fhp->fh_locked) {
	277	fill_post_wcc(fhp);
	278	mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
	279	fhp->fh_locked = 0;
	280	}
	281	}
	282
9c69de4c	283	#endif /* _LINUX_NFSD_NFSFH_H */