[linux.git] / fs / cifs / link.c

/*
 *   fs/cifs/link.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2003
 *   Author(s): Steve French ([email protected])
 *
 *   This library 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; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will 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 library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/namei.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

int
cifs_hardlink(struct dentry *old_file, struct inode *inode,
	      struct dentry *direntry)
{
	int rc = -EACCES;
	int xid;
	char *fromName = NULL;
	char *toName = NULL;
	struct cifs_sb_info *cifs_sb_target;
	struct cifsTconInfo *pTcon;
	struct cifsInodeInfo *cifsInode;

	xid = GetXid();

	cifs_sb_target = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb_target->tcon;

/* No need to check for cross device links since server will do that
   BB note DFS case in future though (when we may have to check) */

	down(&inode->i_sb->s_vfs_rename_sem);
	fromName = build_path_from_dentry(old_file);
	toName = build_path_from_dentry(direntry);
	up(&inode->i_sb->s_vfs_rename_sem);
	if((fromName == NULL) || (toName == NULL)) {
		rc = -ENOMEM;
		goto cifs_hl_exit;
	}

	if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
		rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
					    cifs_sb_target->local_nls, 
					    cifs_sb_target->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
	else {
		rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
					cifs_sb_target->local_nls, 
					cifs_sb_target->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if(rc == -EIO)
			rc = -EOPNOTSUPP;  
	}

/* if (!rc)     */
	{
		/*   renew_parental_timestamps(old_file);
		   inode->i_nlink++;
		   mark_inode_dirty(inode);
		   d_instantiate(direntry, inode); */
		/* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
	}
	d_drop(direntry);	/* force new lookup from server */
	cifsInode = CIFS_I(old_file->d_inode);
	cifsInode->time = 0;	/* will force revalidate to go get info when needed */

cifs_hl_exit:
	if (fromName)
		kfree(fromName);
	if (toName)
		kfree(toName);
	FreeXid(xid);
	return rc;
}

void *
cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
{
	struct inode *inode = direntry->d_inode;
	int rc = -EACCES;
	int xid;
	char *full_path = NULL;
	char * target_path = ERR_PTR(-ENOMEM);
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;

	xid = GetXid();

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&direntry->d_sb->s_vfs_rename_sem);

	if (!full_path)
		goto out_no_free;

	cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;
	target_path = kmalloc(PATH_MAX, GFP_KERNEL);
	if (!target_path) {
		target_path = ERR_PTR(-ENOMEM);
		goto out;
	}

/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
	if (pTcon->ses->capabilities & CAP_UNIX)
		rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
					     target_path,
					     PATH_MAX-1,
					     cifs_sb->local_nls);
	else {
		/* rc = CIFSSMBQueryReparseLinkInfo */
		/* BB Add code to Query ReparsePoint info */
		/* BB Add MAC style xsymlink check here if enabled */
	}

	if (rc == 0) {

/* BB Add special case check for Samba DFS symlinks */

		target_path[PATH_MAX-1] = 0;
	} else {
		kfree(target_path);
		target_path = ERR_PTR(rc);
	}

out:
	kfree(full_path);
out_no_free:
	FreeXid(xid);
	nd_set_link(nd, target_path);
	return NULL;	/* No cookie */
}

int
cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
{
	int rc = -EOPNOTSUPP;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	down(&inode->i_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry);
	up(&inode->i_sb->s_vfs_rename_sem);

	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1, ("Full path: %s ", full_path));
	cFYI(1, ("symname is %s", symname));

	/* BB what if DFS and this volume is on different share? BB */
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
					   cifs_sb->local_nls);
	/* else
	   rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */

	if (rc == 0) {
		if (pTcon->ses->capabilities & CAP_UNIX)
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						      inode->i_sb,xid);
		else
			rc = cifs_get_inode_info(&newinode, full_path, NULL,
						 inode->i_sb,xid);

		if (rc != 0) {
			cFYI(1,
			     ("Create symlink worked but get_inode_info failed with rc = %d ",
			      rc));
		} else {
			direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
	}

	if (full_path)
		kfree(full_path);
	FreeXid(xid);
	return rc;
}

int
cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
{
	struct inode *inode = direntry->d_inode;
	int rc = -EACCES;
	int xid;
	int oplock = FALSE;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	char *tmp_path =  NULL;
	char * tmpbuffer;
	unsigned char * referrals = NULL;
	int num_referrals = 0;
	int len;
	__u16 fid;

	xid = GetXid();
	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

/* BB would it be safe against deadlock to grab this sem 
      even though rename itself grabs the sem and calls lookup? */
/*       down(&inode->i_sb->s_vfs_rename_sem);*/
	full_path = build_path_from_dentry(direntry);
/*       up(&inode->i_sb->s_vfs_rename_sem);*/

	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	cFYI(1,
	     ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
	      full_path, inode, pBuffer, buflen));
	if(buflen > PATH_MAX)
		len = PATH_MAX;
	else
		len = buflen;
	tmpbuffer = kmalloc(len,GFP_KERNEL);   
	if(tmpbuffer == NULL) {
		if (full_path)
			kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}

/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
		rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
				tmpbuffer,
				len - 1,
				cifs_sb->local_nls);
	else {
		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
				OPEN_REPARSE_POINT,&fid, &oplock, NULL, 
				cifs_sb->local_nls, 
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		if(!rc) {
			rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
				tmpbuffer,
				len - 1, 
				fid,
				cifs_sb->local_nls);
			if(CIFSSMBClose(xid, pTcon, fid)) {
				cFYI(1,("Error closing junction point (open for ioctl)"));
			}
			if(rc == -EIO) {
				/* Query if DFS Junction */
				tmp_path =
					kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
						GFP_KERNEL);
				if (tmp_path) {
					strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
					strncat(tmp_path, full_path, MAX_PATHCONF);
					rc = get_dfs_path(xid, pTcon->ses, tmp_path,
						cifs_sb->local_nls,
						&num_referrals, &referrals,
						cifs_sb->mnt_cifs_flags &
						    CIFS_MOUNT_MAP_SPECIAL_CHR);
					cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
					if((num_referrals == 0) && (rc == 0))
						rc = -EACCES;
					else {
						cFYI(1,("num referral: %d",num_referrals));
						if(referrals) {
							cFYI(1,("referral string: %s ",referrals));
							strncpy(tmpbuffer, referrals, len-1);                            
						}
					}
					if(referrals)
						kfree(referrals);
					kfree(tmp_path);
}
				/* BB add code like else decode referrals then memcpy to
				  tmpbuffer and free referrals string array BB */
			}
		}
	}
	/* BB Anything else to do to handle recursive links? */
	/* BB Should we be using page ops here? */

	/* BB null terminate returned string in pBuffer? BB */
	if (rc == 0) {
		rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
		cFYI(1,
		     ("vfs_readlink called from cifs_readlink returned %d",
		      rc));
	}

	if (tmpbuffer) {
		kfree(tmpbuffer);
	}
	if (full_path) {
		kfree(full_path);
	}
	FreeXid(xid);
	return rc;
}

void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
{
	char *p = nd_get_link(nd);
	if (!IS_ERR(p))
		kfree(p);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/link.c
	3	*
	4	* Copyright (C) International Business Machines Corp., 2002,2003
	5	* Author(s): Steve French ([email protected])
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21	#include <linux/fs.h>
	22	#include <linux/stat.h>
	23	#include <linux/namei.h>
	24	#include "cifsfs.h"
	25	#include "cifspdu.h"
	26	#include "cifsglob.h"
	27	#include "cifsproto.h"
	28	#include "cifs_debug.h"
	29	#include "cifs_fs_sb.h"
	30
	31	int
	32	cifs_hardlink(struct dentry old_file, struct inode inode,
	33	struct dentry *direntry)
	34	{
	35	int rc = -EACCES;
	36	int xid;
	37	char *fromName = NULL;
	38	char *toName = NULL;
	39	struct cifs_sb_info *cifs_sb_target;
	40	struct cifsTconInfo *pTcon;
	41	struct cifsInodeInfo *cifsInode;
	42
	43	xid = GetXid();
	44
	45	cifs_sb_target = CIFS_SB(inode->i_sb);
	46	pTcon = cifs_sb_target->tcon;
	47
	48	/* No need to check for cross device links since server will do that
	49	BB note DFS case in future though (when we may have to check) */
	50
	51	down(&inode->i_sb->s_vfs_rename_sem);
	52	fromName = build_path_from_dentry(old_file);
	53	toName = build_path_from_dentry(direntry);
	54	up(&inode->i_sb->s_vfs_rename_sem);
	55	if((fromName == NULL) \|\| (toName == NULL)) {
	56	rc = -ENOMEM;
	57	goto cifs_hl_exit;
	58	}
	59
	60	if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
	61	rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
737b758c SF	62	cifs_sb_target->local_nls,
	63	cifs_sb_target->mnt_cifs_flags &
	64	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	65	else {
1da177e4 LT	66	rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
737b758c SF	67	cifs_sb_target->local_nls,
	68	cifs_sb_target->mnt_cifs_flags &
	69	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	70	if(rc == -EIO)
	71	rc = -EOPNOTSUPP;
	72	}
	73
	74	/* if (!rc) */
	75	{
	76	/* renew_parental_timestamps(old_file);
	77	inode->i_nlink++;
	78	mark_inode_dirty(inode);
	79	d_instantiate(direntry, inode); */
	80	/* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
	81	}
	82	d_drop(direntry); /* force new lookup from server */
	83	cifsInode = CIFS_I(old_file->d_inode);
	84	cifsInode->time = 0; /* will force revalidate to go get info when needed */
	85
	86	cifs_hl_exit:
	87	if (fromName)
	88	kfree(fromName);
	89	if (toName)
	90	kfree(toName);
	91	FreeXid(xid);
	92	return rc;
	93	}
	94
cc314eef	95	void *
1da177e4 LT	96	cifs_follow_link(struct dentry direntry, struct nameidata nd)
	97	{
	98	struct inode *inode = direntry->d_inode;
	99	int rc = -EACCES;
	100	int xid;
	101	char *full_path = NULL;
	102	char * target_path = ERR_PTR(-ENOMEM);
	103	struct cifs_sb_info *cifs_sb;
	104	struct cifsTconInfo *pTcon;
	105
	106	xid = GetXid();
	107
	108	down(&direntry->d_sb->s_vfs_rename_sem);
	109	full_path = build_path_from_dentry(direntry);
	110	up(&direntry->d_sb->s_vfs_rename_sem);
	111
	112	if (!full_path)
	113	goto out_no_free;
	114
	115	cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
	116	cifs_sb = CIFS_SB(inode->i_sb);
	117	pTcon = cifs_sb->tcon;
	118	target_path = kmalloc(PATH_MAX, GFP_KERNEL);
	119	if (!target_path) {
	120	target_path = ERR_PTR(-ENOMEM);
	121	goto out;
	122	}
	123
	124	/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
	125	if (pTcon->ses->capabilities & CAP_UNIX)
	126	rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
	127	target_path,
	128	PATH_MAX-1,
	129	cifs_sb->local_nls);
	130	else {
	131	/* rc = CIFSSMBQueryReparseLinkInfo */
	132	/* BB Add code to Query ReparsePoint info */
	133	/* BB Add MAC style xsymlink check here if enabled */
	134	}
	135
	136	if (rc == 0) {
	137
	138	/* BB Add special case check for Samba DFS symlinks */
	139
	140	target_path[PATH_MAX-1] = 0;
	141	} else {
	142	kfree(target_path);
	143	target_path = ERR_PTR(rc);
	144	}
	145
	146	out:
	147	kfree(full_path);
	148	out_no_free:
	149	FreeXid(xid);
	150	nd_set_link(nd, target_path);
cc314eef	151	return NULL; /* No cookie */
1da177e4 LT	152	}
	153
	154	int
	155	cifs_symlink(struct inode inode, struct dentry direntry, const char *symname)
	156	{
	157	int rc = -EOPNOTSUPP;
	158	int xid;
	159	struct cifs_sb_info *cifs_sb;
	160	struct cifsTconInfo *pTcon;
	161	char *full_path = NULL;
	162	struct inode *newinode = NULL;
	163
	164	xid = GetXid();
	165
	166	cifs_sb = CIFS_SB(inode->i_sb);
	167	pTcon = cifs_sb->tcon;
	168
	169	down(&inode->i_sb->s_vfs_rename_sem);
	170	full_path = build_path_from_dentry(direntry);
	171	up(&inode->i_sb->s_vfs_rename_sem);
	172
	173	if(full_path == NULL) {
	174	FreeXid(xid);
	175	return -ENOMEM;
	176	}
	177
	178	cFYI(1, ("Full path: %s ", full_path));
	179	cFYI(1, ("symname is %s", symname));
	180
	181	/* BB what if DFS and this volume is on different share? BB */
	182	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
	183	rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
	184	cifs_sb->local_nls);
	185	/* else
	186	rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
	187
	188	if (rc == 0) {
	189	if (pTcon->ses->capabilities & CAP_UNIX)
	190	rc = cifs_get_inode_info_unix(&newinode, full_path,
	191	inode->i_sb,xid);
	192	else
	193	rc = cifs_get_inode_info(&newinode, full_path, NULL,
	194	inode->i_sb,xid);
	195
	196	if (rc != 0) {
	197	cFYI(1,
	198	("Create symlink worked but get_inode_info failed with rc = %d ",
	199	rc));
	200	} else {
	201	direntry->d_op = &cifs_dentry_ops;
	202	d_instantiate(direntry, newinode);
	203	}
	204	}
	205
	206	if (full_path)
	207	kfree(full_path);
	208	FreeXid(xid);
	209	return rc;
	210	}
	211
	212	int
	213	cifs_readlink(struct dentry direntry, char __user pBuffer, int buflen)
	214	{
	215	struct inode *inode = direntry->d_inode;
216	int rc = -EACCES;
217	int xid;
218	int oplock = FALSE;
219	struct cifs_sb_info *cifs_sb;
220	struct cifsTconInfo *pTcon;
221	char *full_path = NULL;
222	char *tmp_path = NULL;
223	char * tmpbuffer;
224	unsigned char * referrals = NULL;
225	int num_referrals = 0;
226	int len;
227	__u16 fid;
228
229	xid = GetXid();
230	cifs_sb = CIFS_SB(inode->i_sb);
231	pTcon = cifs_sb->tcon;
232
233	/* BB would it be safe against deadlock to grab this sem
234	even though rename itself grabs the sem and calls lookup? */
235	/* down(&inode->i_sb->s_vfs_rename_sem);*/
236	full_path = build_path_from_dentry(direntry);
237	/* up(&inode->i_sb->s_vfs_rename_sem);*/
238
239	if(full_path == NULL) {
240	FreeXid(xid);
241	return -ENOMEM;
242	}
243
244	cFYI(1,
245	("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
246	full_path, inode, pBuffer, buflen));
247	if(buflen > PATH_MAX)
248	len = PATH_MAX;
249	else
250	len = buflen;
251	tmpbuffer = kmalloc(len,GFP_KERNEL);
252	if(tmpbuffer == NULL) {
253	if (full_path)
254	kfree(full_path);
255	FreeXid(xid);
256	return -ENOMEM;
257	}
258
259	/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
260	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
261	rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
262	tmpbuffer,
263	len - 1,
264	cifs_sb->local_nls);
265	else {
266	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
737b758c SF	267	OPEN_REPARSE_POINT,&fid, &oplock, NULL,
	268	cifs_sb->local_nls,
	269	cifs_sb->mnt_cifs_flags &
	270	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	271	if(!rc) {
	272	rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
	273	tmpbuffer,
	274	len - 1,
	275	fid,
	276	cifs_sb->local_nls);
	277	if(CIFSSMBClose(xid, pTcon, fid)) {
	278	cFYI(1,("Error closing junction point (open for ioctl)"));
	279	}
	280	if(rc == -EIO) {
	281	/* Query if DFS Junction */
	282	tmp_path =
	283	kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
	284	GFP_KERNEL);
	285	if (tmp_path) {
	286	strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
	287	strncat(tmp_path, full_path, MAX_PATHCONF);
	288	rc = get_dfs_path(xid, pTcon->ses, tmp_path,
737b758c SF	289	cifs_sb->local_nls,
	290	&num_referrals, &referrals,
	291	cifs_sb->mnt_cifs_flags &
	292	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	293	cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
	294	if((num_referrals == 0) && (rc == 0))
	295	rc = -EACCES;
	296	else {
	297	cFYI(1,("num referral: %d",num_referrals));
	298	if(referrals) {
	299	cFYI(1,("referral string: %s ",referrals));
	300	strncpy(tmpbuffer, referrals, len-1);
	301	}
	302	}
	303	if(referrals)
	304	kfree(referrals);
	305	kfree(tmp_path);
	306	}
	307	/* BB add code like else decode referrals then memcpy to
	308	tmpbuffer and free referrals string array BB */
	309	}
	310	}
	311	}
	312	/* BB Anything else to do to handle recursive links? */
	313	/* BB Should we be using page ops here? */
	314
	315	/* BB null terminate returned string in pBuffer? BB */
	316	if (rc == 0) {
	317	rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
	318	cFYI(1,
	319	("vfs_readlink called from cifs_readlink returned %d",
	320	rc));
	321	}
	322
	323	if (tmpbuffer) {
	324	kfree(tmpbuffer);
	325	}
	326	if (full_path) {
	327	kfree(full_path);
	328	}
	329	FreeXid(xid);
	330	return rc;
	331	}
	332
cc314eef	333	void cifs_put_link(struct dentry direntry, struct nameidata nd, void *cookie)
1da177e4 LT	334	{
	335	char *p = nd_get_link(nd);
	336	if (!IS_ERR(p))
	337	kfree(p);
	338	}