[thirdparty/xfsprogs-dev.git] / libhandle / handle.c

/*
 * Copyright (c) 1995, 2001-2003, 2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <libgen.h>
#include "platform_defs.h"
#include "xfs.h"
#include "handle.h"
#include "parent.h"

/* just pick a value we know is more than big enough */
#define	MAXHANSIZ	64

/*
 *  The actual content of a handle is supposed to be opaque here.
 *  But, to do handle_to_fshandle, we need to know what it is.  Sigh.
 *  However we can get by with knowing only that the first 8 bytes of
 *  a file handle are the file system ID, and that a file system handle
 *  consists of only those 8 bytes.
 */

#define	FSIDSIZE	8

typedef union {
	int	fd;
	char	*path;
} comarg_t;

static int obj_to_handle(char *, int, unsigned int, comarg_t, void**, size_t*);
static int handle_to_fsfd(void *, char **);
static char *path_to_fspath(char *path);


/*
 * Filesystem Handle -> Open File Descriptor Cache
 *
 * Maps filesystem handles to a corresponding open file descriptor for that
 * filesystem. We need this because we're doing handle operations via xfsctl
 * and we need to remember the open file descriptor for each filesystem.
 */

struct fdhash {
	int	fsfd;
	char	fsh[FSIDSIZE];
	struct fdhash *fnxt;
	char	fspath[MAXPATHLEN];
};

static struct fdhash *fdhash_head = NULL;

int
path_to_fshandle(
	char		*path,		/* input,  path to convert */
	void		**fshanp,	/* output, pointer to data */
	size_t		*fshlen)	/* output, size of returned data */
{
	int		result;
	int		fd;
	comarg_t	obj;
	struct fdhash	*fdhp;
	char		*tmppath;
	char		*fspath;

	fspath = path_to_fspath(path);
	if (fspath == NULL)
		return -1;

	fd = open(fspath, O_RDONLY);
	if (fd < 0)
		return -1;

	obj.path = path;
	result = obj_to_handle(fspath, fd, XFS_IOC_PATH_TO_FSHANDLE,
				obj, fshanp, fshlen);
	if (result < 0) {
		close(fd);
		return result;
	}

	if (handle_to_fsfd(*fshanp, &tmppath) >= 0) {
		/* this filesystem is already in the cache */
		close(fd);
	} else {
		/* new filesystem. add it to the cache */
		fdhp = malloc(sizeof(struct fdhash));
		if (fdhp == NULL) {
			free(*fshanp);
			close(fd);
			errno = ENOMEM;
			return -1;
		}

		fdhp->fsfd = fd;
		strncpy(fdhp->fspath, fspath, sizeof(fdhp->fspath));
		memcpy(fdhp->fsh, *fshanp, FSIDSIZE);

		fdhp->fnxt = fdhash_head;
		fdhash_head = fdhp;
	}

	return result;
}

int
path_to_handle(
	char		*path,		/* input,  path to convert */
	void		**hanp,		/* output, pointer to data */
	size_t		*hlen)		/* output, size of returned data */
{
	int		fd;
	int		result;
	comarg_t	obj;
	char		*fspath;

	fspath = path_to_fspath(path);
	if (fspath == NULL)
		return -1;

	fd = open(fspath, O_RDONLY);
	if (fd < 0)
		return -1;

	obj.path = path;
	result = obj_to_handle(fspath, fd, XFS_IOC_PATH_TO_HANDLE,
				obj, hanp, hlen);
	close(fd);
	return result;
}

/* Given a path, return a suitable "fspath" for use in obtaining
 * an fd for xfsctl calls. For regular files and directories the
 * input path is sufficient. For other types the parent directory
 * is used to avoid issues with opening dangling symlinks and
 * potentially blocking in an open on a named pipe. Also
 * symlinks to files on other filesystems would be a problem,
 * since an fd would be obtained for the wrong fs.
 */
static char *
path_to_fspath(char *path)
{
	static char dirpath[MAXPATHLEN];
	struct stat statbuf;

	if (lstat(path, &statbuf) != 0)
		return NULL;

	if (S_ISREG(statbuf.st_mode) || S_ISDIR(statbuf.st_mode))
		return path;

	strncpy(dirpath, path, MAXPATHLEN);
	dirpath[MAXPATHLEN-1] = '\0';
	return dirname(dirpath);
}

int
fd_to_handle (
	int		fd,		/* input,  file descriptor */
	void		**hanp,		/* output, pointer to data */
	size_t		*hlen)		/* output, size of returned data */
{
	comarg_t	obj;

	obj.fd = fd;
	return obj_to_handle(NULL, fd, XFS_IOC_FD_TO_HANDLE, obj, hanp, hlen);
}


int
handle_to_fshandle(
	void		*hanp,
	size_t		hlen,
	void		**fshanp,
	size_t		*fshlen)
{
	if (hlen < FSIDSIZE) {
		errno = EINVAL;
		return -1;
	}
	*fshanp = malloc(FSIDSIZE);
	if (*fshanp == NULL) {
		errno = ENOMEM;
		return -1;
	}
	*fshlen = FSIDSIZE;
	memcpy(*fshanp, hanp, FSIDSIZE);
	return 0;
}

static int
handle_to_fsfd(void *hanp, char **path)
{
	struct fdhash	*fdhp;

	/*
	 * Look in cache for matching fsid field in the handle
	 * (which is at the start of the handle).
	 * When found return the file descriptor and path that
	 * we have in the cache.
	 */
	for (fdhp = fdhash_head; fdhp != NULL; fdhp = fdhp->fnxt) {
		if (memcmp(fdhp->fsh, hanp, FSIDSIZE) == 0) {
			*path = fdhp->fspath;
			return fdhp->fsfd;
		}
	}
	errno = EBADF;
	return -1;
}

static int
obj_to_handle(
	char		*fspath,
	int		fsfd,
	unsigned int	opcode,
	comarg_t	obj,
	void		**hanp,
	size_t		*hlen)
{
	char		hbuf [MAXHANSIZ];
	int		ret;
	__uint32_t	handlen;
	xfs_fsop_handlereq_t hreq;

	if (opcode == XFS_IOC_FD_TO_HANDLE) {
		hreq.fd      = obj.fd;
		hreq.path    = NULL;
	} else {
		hreq.fd      = 0;
		hreq.path    = obj.path;
	}

	hreq.oflags   = O_LARGEFILE;
	hreq.ihandle  = NULL;
	hreq.ihandlen = 0;
	hreq.ohandle  = hbuf;
	hreq.ohandlen = &handlen;

	ret = xfsctl(fspath, fsfd, opcode, &hreq);
	if (ret)
		return ret;

	*hanp = malloc(handlen);
	if (*hanp == NULL) {
		errno = ENOMEM;
		return -1;
	}

	memcpy(*hanp, hbuf, handlen);
	*hlen = handlen;
	return 0;
}

int
open_by_fshandle(
	void		*fshanp,
	size_t		fshlen,
	int		rw)
{
	int		fsfd;
	char		*path;
	xfs_fsop_handlereq_t hreq;

	if ((fsfd = handle_to_fsfd(fshanp, &path)) < 0)
		return -1;

	hreq.fd       = 0;
	hreq.path     = NULL;
	hreq.oflags   = rw | O_LARGEFILE;
	hreq.ihandle  = fshanp;
	hreq.ihandlen = fshlen;
	hreq.ohandle  = NULL;
	hreq.ohandlen = NULL;

	return xfsctl(path, fsfd, XFS_IOC_OPEN_BY_HANDLE, &hreq);
}

int
open_by_handle(
	void		*hanp,
	size_t		hlen,
	int		rw)
{
	int		fsfd;
	char		*path;
	xfs_fsop_handlereq_t hreq;

	if ((fsfd = handle_to_fsfd(hanp, &path)) < 0)
		return -1;

	hreq.fd       = 0;
	hreq.path     = NULL;
	hreq.oflags   = rw | O_LARGEFILE;
	hreq.ihandle  = hanp;
	hreq.ihandlen = hlen;
	hreq.ohandle  = NULL;
	hreq.ohandlen = NULL;

	return xfsctl(path, fsfd, XFS_IOC_OPEN_BY_HANDLE, &hreq);
}

int
readlink_by_handle(
	void		*hanp,
	size_t		hlen,
	void		*buf,
	size_t		bufsiz)
{
	int		fd;
	__u32		buflen = (__u32)bufsiz;
	char		*path;
	xfs_fsop_handlereq_t hreq;

	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
		return -1;

	hreq.fd       = 0;
	hreq.path     = NULL;
	hreq.oflags   = O_LARGEFILE;
	hreq.ihandle  = hanp;
	hreq.ihandlen = hlen;
	hreq.ohandle  = buf;
	hreq.ohandlen = &buflen;

	return xfsctl(path, fd, XFS_IOC_READLINK_BY_HANDLE, &hreq);
}

/*ARGSUSED4*/
int
attr_multi_by_handle(
	void		*hanp,
	size_t		hlen,
	void		*buf,
	int		rtrvcnt,
	int		flags)
{
	int		fd;
	char		*path;
	xfs_fsop_attrmulti_handlereq_t amhreq;

	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
		return -1;

	amhreq.hreq.fd       = 0;
	amhreq.hreq.path     = NULL;
	amhreq.hreq.oflags   = O_LARGEFILE;
	amhreq.hreq.ihandle  = hanp;
	amhreq.hreq.ihandlen = hlen;
	amhreq.hreq.ohandle  = NULL;
	amhreq.hreq.ohandlen = NULL;

	amhreq.opcount = rtrvcnt;
	amhreq.ops = buf;

	return xfsctl(path, fd, XFS_IOC_ATTRMULTI_BY_HANDLE, &amhreq);
}

int
attr_list_by_handle(
	void		*hanp,
	size_t		hlen,
	void		*buf,
	size_t		bufsize,
	int		flags,
	struct attrlist_cursor *cursor)
{
	int		error, fd;
	char		*path;
	xfs_fsop_attrlist_handlereq_t alhreq;

	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
		return -1;

	alhreq.hreq.fd       = 0;
	alhreq.hreq.path     = NULL;
	alhreq.hreq.oflags   = O_LARGEFILE;
	alhreq.hreq.ihandle  = hanp;
	alhreq.hreq.ihandlen = hlen;
	alhreq.hreq.ohandle  = NULL;
	alhreq.hreq.ohandlen = NULL;

	memcpy(&alhreq.pos, cursor, sizeof(alhreq.pos));
	alhreq.flags = flags;
	alhreq.buffer = buf;
	alhreq.buflen = bufsize;
	/* prevent needless EINVAL from the kernel */
	if (alhreq.buflen > XFS_XATTR_LIST_MAX)
		alhreq.buflen = XFS_XATTR_LIST_MAX;

	error = xfsctl(path, fd, XFS_IOC_ATTRLIST_BY_HANDLE, &alhreq);

	memcpy(cursor, &alhreq.pos, sizeof(alhreq.pos));
	return error;
}

int
parents_by_handle(
	void		*hanp,
	size_t		hlen,
	parent_t	*buf,
	size_t		bufsiz,
	unsigned int	*count)
	
{
	errno = EOPNOTSUPP;
	return -1;
}

int
parentpaths_by_handle(
	void		*hanp,
	size_t		hlen,
	parent_t	*buf,
	size_t		bufsiz,
	unsigned int	*count)
{
	errno = EOPNOTSUPP;
	return -1;
}

int
fssetdm_by_handle(
	void		*hanp,
	size_t		hlen,
	struct fsdmidata *fsdmidata)
{
	int		fd;
	char		*path;
	xfs_fsop_setdm_handlereq_t dmhreq;

	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
		return -1;

	dmhreq.hreq.fd       = 0;
	dmhreq.hreq.path     = NULL;
	dmhreq.hreq.oflags   = O_LARGEFILE;
	dmhreq.hreq.ihandle  = hanp;
	dmhreq.hreq.ihandlen = hlen;
	dmhreq.hreq.ohandle  = NULL;
	dmhreq.hreq.ohandlen = NULL;

	dmhreq.data = fsdmidata;

	return xfsctl(path, fd, XFS_IOC_FSSETDM_BY_HANDLE, &dmhreq);
}

/*ARGSUSED1*/
void
free_handle(
	void		*hanp,
	size_t		hlen)
{
	free(hanp);
}
Commit	Line	Data
e9688c1d	1	/*
da23017d NS	2	* Copyright (c) 1995, 2001-2003, 2005 Silicon Graphics, Inc.
da23017d NS	3	* All Rights Reserved.
7c49c48b	4	*
da23017d NS	5	* This program is free software; you can redistribute it and/or
da23017d NS	6	* modify it under the terms of the GNU Lesser General Public License
7c49c48b DR	7	* as published by the Free Software Foundation.
7c49c48b DR	8	*
da23017d NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU Lesser General Public License for more details.
7c49c48b	13	*
da23017d NS	14	* You should have received a copy of the GNU Lesser General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
e9688c1d NS	17	*/
e9688c1d NS	18
a8de1cf9	19	#include <libgen.h>
dcabd4e7	20	#include "platform_defs.h"
6b803e5a CH	21	#include "xfs.h"
	22	#include "handle.h"
	23	#include "parent.h"
e9688c1d	24
e9688c1d NS	25	/* just pick a value we know is more than big enough */
	26	#define MAXHANSIZ 64
	27
	28	/*
	29	* The actual content of a handle is supposed to be opaque here.
	30	* But, to do handle_to_fshandle, we need to know what it is. Sigh.
	31	* However we can get by with knowing only that the first 8 bytes of
	32	* a file handle are the file system ID, and that a file system handle
	33	* consists of only those 8 bytes.
	34	*/
	35
	36	#define FSIDSIZE 8
	37
	38	typedef union {
	39	int fd;
	40	char *path;
	41	} comarg_t;
	42
3fbbdc85 NS	43	static int obj_to_handle(char , int, unsigned int, comarg_t, void, size_t);
3fbbdc85 NS	44	static int handle_to_fsfd(void , char *);
a8de1cf9	45	static char path_to_fspath(char path);
93d9f139	46
89184fbc AG	47
	48	/*
	49	* Filesystem Handle -> Open File Descriptor Cache
	50	*
	51	* Maps filesystem handles to a corresponding open file descriptor for that
93d9f139	52	* filesystem. We need this because we're doing handle operations via xfsctl
89184fbc AG	53	* and we need to remember the open file descriptor for each filesystem.
89184fbc AG	54	*/
e9688c1d NS	55
	56	struct fdhash {
	57	int fsfd;
	58	char fsh[FSIDSIZE];
	59	struct fdhash *fnxt;
93d9f139	60	char fspath[MAXPATHLEN];
e9688c1d NS	61	};
e9688c1d NS	62
dc987226	63	static struct fdhash *fdhash_head = NULL;
e9688c1d NS	64
e9688c1d NS	65	int
3fbbdc85	66	path_to_fshandle(
e9688c1d	67	char path, / input, path to convert */
a3cbe7cd MK	68	void *fshanp, / output, pointer to data */
a3cbe7cd MK	69	size_t fshlen) / output, size of returned data */
e9688c1d NS	70	{
	71	int result;
	72	int fd;
	73	comarg_t obj;
	74	struct fdhash *fdhp;
dc987226	75	char *tmppath;
a8de1cf9	76	char *fspath;
e9688c1d	77
a8de1cf9 BK	78	fspath = path_to_fspath(path);
	79	if (fspath == NULL)
	80	return -1;
	81
	82	fd = open(fspath, O_RDONLY);
3fbbdc85 NS	83	if (fd < 0)
3fbbdc85 NS	84	return -1;
e9688c1d NS	85
e9688c1d NS	86	obj.path = path;
a8de1cf9	87	result = obj_to_handle(fspath, fd, XFS_IOC_PATH_TO_FSHANDLE,
a3cbe7cd	88	obj, fshanp, fshlen);
dc987226 BK	89	if (result < 0) {
	90	close(fd);
	91	return result;
	92	}
da23017d	93
dc987226 BK	94	if (handle_to_fsfd(*fshanp, &tmppath) >= 0) {
	95	/* this filesystem is already in the cache */
	96	close(fd);
	97	} else {
	98	/* new filesystem. add it to the cache */
e9688c1d	99	fdhp = malloc(sizeof(struct fdhash));
e9688c1d	100	if (fdhp == NULL) {
8f1c8e13	101	free(*fshanp);
11e06961	102	close(fd);
e9688c1d NS	103	errno = ENOMEM;
	104	return -1;
	105	}
	106
	107	fdhp->fsfd = fd;
a8de1cf9	108	strncpy(fdhp->fspath, fspath, sizeof(fdhp->fspath));
a3cbe7cd MK	109	memcpy(fdhp->fsh, *fshanp, FSIDSIZE);
a3cbe7cd MK	110
dc987226 BK	111	fdhp->fnxt = fdhash_head;
dc987226 BK	112	fdhash_head = fdhp;
e9688c1d NS	113	}
	114
	115	return result;
	116	}
	117
e9688c1d	118	int
3fbbdc85	119	path_to_handle(
e9688c1d NS	120	char path, / input, path to convert */
	121	void *hanp, / output, pointer to data */
	122	size_t hlen) / output, size of returned data */
	123	{
	124	int fd;
	125	int result;
	126	comarg_t obj;
a8de1cf9	127	char *fspath;
e9688c1d	128
a8de1cf9 BK	129	fspath = path_to_fspath(path);
	130	if (fspath == NULL)
	131	return -1;
	132
	133	fd = open(fspath, O_RDONLY);
3fbbdc85 NS	134	if (fd < 0)
3fbbdc85 NS	135	return -1;
e9688c1d NS	136
e9688c1d NS	137	obj.path = path;
a8de1cf9	138	result = obj_to_handle(fspath, fd, XFS_IOC_PATH_TO_HANDLE,
3fbbdc85	139	obj, hanp, hlen);
e9688c1d	140	close(fd);
e9688c1d NS	141	return result;
	142	}
	143
a8de1cf9 BK	144	/* Given a path, return a suitable "fspath" for use in obtaining
	145	* an fd for xfsctl calls. For regular files and directories the
	146	* input path is sufficient. For other types the parent directory
	147	* is used to avoid issues with opening dangling symlinks and
	148	* potentially blocking in an open on a named pipe. Also
	149	* symlinks to files on other filesystems would be a problem,
	150	* since an fd would be obtained for the wrong fs.
	151	*/
	152	static char *
	153	path_to_fspath(char *path)
	154	{
	155	static char dirpath[MAXPATHLEN];
	156	struct stat statbuf;
	157
	158	if (lstat(path, &statbuf) != 0)
	159	return NULL;
	160
	161	if (S_ISREG(statbuf.st_mode) \|\| S_ISDIR(statbuf.st_mode))
	162	return path;
	163
55d1fd48 ES	164	strncpy(dirpath, path, MAXPATHLEN);
55d1fd48 ES	165	dirpath[MAXPATHLEN-1] = '\0';
a8de1cf9 BK	166	return dirname(dirpath);
a8de1cf9 BK	167	}
8967ee43 TS	168
	169	int
	170	fd_to_handle (
	171	int fd, /* input, file descriptor */
	172	void *hanp, / output, pointer to data */
	173	size_t hlen) / output, size of returned data */
	174	{
	175	comarg_t obj;
	176
	177	obj.fd = fd;
	178	return obj_to_handle(NULL, fd, XFS_IOC_FD_TO_HANDLE, obj, hanp, hlen);
	179	}
	180
	181
e9688c1d	182	int
3fbbdc85	183	handle_to_fshandle(
e9688c1d NS	184	void *hanp,
	185	size_t hlen,
	186	void **fshanp,
	187	size_t *fshlen)
	188	{
dc987226 BK	189	if (hlen < FSIDSIZE) {
	190	errno = EINVAL;
	191	return -1;
	192	}
3fbbdc85	193	*fshanp = malloc(FSIDSIZE);
dc987226 BK	194	if (*fshanp == NULL) {
	195	errno = ENOMEM;
	196	return -1;
	197	}
e9688c1d	198	*fshlen = FSIDSIZE;
e9688c1d	199	memcpy(*fshanp, hanp, FSIDSIZE);
e9688c1d NS	200	return 0;
	201	}
	202
93d9f139 NS	203	static int
93d9f139 NS	204	handle_to_fsfd(void hanp, char *path)
89184fbc AG	205	{
	206	struct fdhash *fdhp;
	207
8967ee43 TS	208	/*
	209	* Look in cache for matching fsid field in the handle
	210	* (which is at the start of the handle).
	211	* When found return the file descriptor and path that
	212	* we have in the cache.
	213	*/
89184fbc	214	for (fdhp = fdhash_head; fdhp != NULL; fdhp = fdhp->fnxt) {
93d9f139 NS	215	if (memcmp(fdhp->fsh, hanp, FSIDSIZE) == 0) {
93d9f139 NS	216	*path = fdhp->fspath;
89184fbc	217	return fdhp->fsfd;
93d9f139	218	}
89184fbc	219	}
3fbbdc85	220	errno = EBADF;
89184fbc AG	221	return -1;
	222	}
	223
93d9f139	224	static int
3fbbdc85	225	obj_to_handle(
93d9f139	226	char *fspath,
e9688c1d	227	int fsfd,
5b64e00a	228	unsigned int opcode,
e9688c1d NS	229	comarg_t obj,
	230	void **hanp,
	231	size_t *hlen)
	232	{
	233	char hbuf [MAXHANSIZ];
	234	int ret;
ace4c158	235	__uint32_t handlen;
e9688c1d NS	236	xfs_fsop_handlereq_t hreq;
	237
	238	if (opcode == XFS_IOC_FD_TO_HANDLE) {
	239	hreq.fd = obj.fd;
	240	hreq.path = NULL;
	241	} else {
	242	hreq.fd = 0;
	243	hreq.path = obj.path;
	244	}
	245
489aaf4d	246	hreq.oflags = O_LARGEFILE;
e9688c1d NS	247	hreq.ihandle = NULL;
	248	hreq.ihandlen = 0;
	249	hreq.ohandle = hbuf;
ace4c158	250	hreq.ohandlen = &handlen;
fe37ab57	251
93d9f139	252	ret = xfsctl(fspath, fsfd, opcode, &hreq);
e9688c1d NS	253	if (ret)
	254	return ret;
	255
ace4c158	256	*hanp = malloc(handlen);
e9688c1d NS	257	if (*hanp == NULL) {
	258	errno = ENOMEM;
	259	return -1;
	260	}
	261
ace4c158 CH	262	memcpy(*hanp, hbuf, handlen);
ace4c158 CH	263	*hlen = handlen;
e9688c1d NS	264	return 0;
	265	}
	266
a3cbe7cd MK	267	int
	268	open_by_fshandle(
	269	void *fshanp,
	270	size_t fshlen,
	271	int rw)
	272	{
	273	int fsfd;
	274	char *path;
	275	xfs_fsop_handlereq_t hreq;
	276
	277	if ((fsfd = handle_to_fsfd(fshanp, &path)) < 0)
	278	return -1;
	279
	280	hreq.fd = 0;
	281	hreq.path = NULL;
	282	hreq.oflags = rw \| O_LARGEFILE;
	283	hreq.ihandle = fshanp;
	284	hreq.ihandlen = fshlen;
	285	hreq.ohandle = NULL;
	286	hreq.ohandlen = NULL;
	287
	288	return xfsctl(path, fsfd, XFS_IOC_OPEN_BY_HANDLE, &hreq);
	289	}
	290
e9688c1d	291	int
3fbbdc85	292	open_by_handle(
e9688c1d NS	293	void *hanp,
	294	size_t hlen,
	295	int rw)
	296	{
a3cbe7cd	297	int fsfd;
93d9f139	298	char *path;
e9688c1d NS	299	xfs_fsop_handlereq_t hreq;
e9688c1d NS	300
45243d21	301	if ((fsfd = handle_to_fsfd(hanp, &path)) < 0)
e9688c1d	302	return -1;
e9688c1d NS	303
	304	hreq.fd = 0;
	305	hreq.path = NULL;
489aaf4d	306	hreq.oflags = rw \| O_LARGEFILE;
e9688c1d NS	307	hreq.ihandle = hanp;
	308	hreq.ihandlen = hlen;
	309	hreq.ohandle = NULL;
	310	hreq.ohandlen = NULL;
	311
a3cbe7cd	312	return xfsctl(path, fsfd, XFS_IOC_OPEN_BY_HANDLE, &hreq);
e9688c1d NS	313	}
	314
	315	int
3fbbdc85	316	readlink_by_handle(
e9688c1d NS	317	void *hanp,
	318	size_t hlen,
	319	void *buf,
	320	size_t bufsiz)
	321	{
	322	int fd;
1771a6dd	323	__u32 buflen = (__u32)bufsiz;
93d9f139	324	char *path;
e9688c1d NS	325	xfs_fsop_handlereq_t hreq;
e9688c1d NS	326
3fbbdc85	327	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
e9688c1d	328	return -1;
e9688c1d NS	329
	330	hreq.fd = 0;
	331	hreq.path = NULL;
489aaf4d	332	hreq.oflags = O_LARGEFILE;
e9688c1d NS	333	hreq.ihandle = hanp;
	334	hreq.ihandlen = hlen;
	335	hreq.ohandle = buf;
1771a6dd	336	hreq.ohandlen = &buflen;
e9688c1d	337
93d9f139	338	return xfsctl(path, fd, XFS_IOC_READLINK_BY_HANDLE, &hreq);
e9688c1d NS	339	}
e9688c1d NS	340
8967ee43	341	/ARGSUSED4/
14290264 NS	342	int
	343	attr_multi_by_handle(
	344	void *hanp,
	345	size_t hlen,
	346	void *buf,
	347	int rtrvcnt,
	348	int flags)
	349	{
	350	int fd;
93d9f139	351	char *path;
14290264 NS	352	xfs_fsop_attrmulti_handlereq_t amhreq;
14290264 NS	353
3fbbdc85	354	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
14290264	355	return -1;
14290264 NS	356
	357	amhreq.hreq.fd = 0;
	358	amhreq.hreq.path = NULL;
489aaf4d	359	amhreq.hreq.oflags = O_LARGEFILE;
14290264 NS	360	amhreq.hreq.ihandle = hanp;
	361	amhreq.hreq.ihandlen = hlen;
	362	amhreq.hreq.ohandle = NULL;
	363	amhreq.hreq.ohandlen = NULL;
	364
	365	amhreq.opcount = rtrvcnt;
	366	amhreq.ops = buf;
	367
93d9f139	368	return xfsctl(path, fd, XFS_IOC_ATTRMULTI_BY_HANDLE, &amhreq);
14290264 NS	369	}
	370
	371	int
	372	attr_list_by_handle(
	373	void *hanp,
	374	size_t hlen,
	375	void *buf,
	376	size_t bufsize,
	377	int flags,
	378	struct attrlist_cursor *cursor)
	379	{
258b00ea	380	int error, fd;
93d9f139	381	char *path;
14290264 NS	382	xfs_fsop_attrlist_handlereq_t alhreq;
14290264 NS	383
3fbbdc85	384	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
14290264	385	return -1;
14290264 NS	386
	387	alhreq.hreq.fd = 0;
	388	alhreq.hreq.path = NULL;
489aaf4d	389	alhreq.hreq.oflags = O_LARGEFILE;
14290264 NS	390	alhreq.hreq.ihandle = hanp;
	391	alhreq.hreq.ihandlen = hlen;
	392	alhreq.hreq.ohandle = NULL;
	393	alhreq.hreq.ohandlen = NULL;
	394
	395	memcpy(&alhreq.pos, cursor, sizeof(alhreq.pos));
	396	alhreq.flags = flags;
14290264	397	alhreq.buffer = buf;
aa23a327 MG	398	alhreq.buflen = bufsize;
aa23a327 MG	399	/* prevent needless EINVAL from the kernel */
54e724c0 JT	400	if (alhreq.buflen > XFS_XATTR_LIST_MAX)
54e724c0 JT	401	alhreq.buflen = XFS_XATTR_LIST_MAX;
14290264	402
258b00ea TS	403	error = xfsctl(path, fd, XFS_IOC_ATTRLIST_BY_HANDLE, &alhreq);
	404
	405	memcpy(cursor, &alhreq.pos, sizeof(alhreq.pos));
	406	return error;
	407	}
	408
	409	int
60ac13e8	410	parents_by_handle(
258b00ea TS	411	void *hanp,
	412	size_t hlen,
	413	parent_t *buf,
	414	size_t bufsiz,
60ac13e8 TS	415	unsigned int *count)
60ac13e8 TS	416
258b00ea	417	{
258b00ea TS	418	errno = EOPNOTSUPP;
258b00ea TS	419	return -1;
258b00ea TS	420	}
	421
	422	int
60ac13e8	423	parentpaths_by_handle(
258b00ea TS	424	void *hanp,
	425	size_t hlen,
	426	parent_t *buf,
	427	size_t bufsiz,
60ac13e8	428	unsigned int *count)
258b00ea	429	{
258b00ea TS	430	errno = EOPNOTSUPP;
258b00ea TS	431	return -1;
14290264 NS	432	}
14290264 NS	433
e1864286	434	int
3fbbdc85	435	fssetdm_by_handle(
e1864286 DR	436	void *hanp,
	437	size_t hlen,
	438	struct fsdmidata *fsdmidata)
	439	{
	440	int fd;
93d9f139	441	char *path;
e1864286 DR	442	xfs_fsop_setdm_handlereq_t dmhreq;
e1864286 DR	443
3fbbdc85	444	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
e1864286	445	return -1;
e1864286 DR	446
	447	dmhreq.hreq.fd = 0;
	448	dmhreq.hreq.path = NULL;
489aaf4d	449	dmhreq.hreq.oflags = O_LARGEFILE;
e1864286 DR	450	dmhreq.hreq.ihandle = hanp;
	451	dmhreq.hreq.ihandlen = hlen;
	452	dmhreq.hreq.ohandle = NULL;
	453	dmhreq.hreq.ohandlen = NULL;
	454
	455	dmhreq.data = fsdmidata;
	456
93d9f139	457	return xfsctl(path, fd, XFS_IOC_FSSETDM_BY_HANDLE, &dmhreq);
e1864286 DR	458	}
e1864286 DR	459
8967ee43	460	/ARGSUSED1/
e9688c1d	461	void
3fbbdc85	462	free_handle(
e9688c1d NS	463	void *hanp,
	464	size_t hlen)
	465	{
3fbbdc85	466	free(hanp);
e9688c1d	467	}