[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) */

	fromName = build_path_from_dentry(old_file);
	toName = build_path_from_dentry(direntry);
	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 == -EINVAL))
			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:
	kfree(fromName);
	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();

	full_path = build_path_from_dentry(direntry);

	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;

	full_path = build_path_from_dentry(direntry);

	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 {
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
	}

	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? */
/*       mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
	full_path = build_path_from_dentry(direntry);
/*       mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/

	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) {
		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);                            
						}
					}
					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));
	}

	kfree(tmpbuffer);
	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
7f57356b SF	51	fromName = build_path_from_dentry(old_file);
7f57356b SF	52	toName = build_path_from_dentry(direntry);
1da177e4 LT	53	if((fromName == NULL) \|\| (toName == NULL)) {
	54	rc = -ENOMEM;
	55	goto cifs_hl_exit;
	56	}
	57
	58	if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
	59	rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
737b758c SF	60	cifs_sb_target->local_nls,
	61	cifs_sb_target->mnt_cifs_flags &
	62	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	63	else {
1da177e4 LT	64	rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
737b758c SF	65	cifs_sb_target->local_nls,
	66	cifs_sb_target->mnt_cifs_flags &
	67	CIFS_MOUNT_MAP_SPECIAL_CHR);
083d3a2c	68	if((rc == -EIO) \|\| (rc == -EINVAL))
1da177e4 LT	69	rc = -EOPNOTSUPP;
	70	}
	71
	72	/* if (!rc) */
	73	{
	74	/* renew_parental_timestamps(old_file);
	75	inode->i_nlink++;
	76	mark_inode_dirty(inode);
	77	d_instantiate(direntry, inode); */
	78	/* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
	79	}
	80	d_drop(direntry); /* force new lookup from server */
	81	cifsInode = CIFS_I(old_file->d_inode);
	82	cifsInode->time = 0; /* will force revalidate to go get info when needed */
	83
	84	cifs_hl_exit:
f99d49ad JJ	85	kfree(fromName);
f99d49ad JJ	86	kfree(toName);
1da177e4 LT	87	FreeXid(xid);
	88	return rc;
	89	}
	90
cc314eef	91	void *
1da177e4 LT	92	cifs_follow_link(struct dentry direntry, struct nameidata nd)
	93	{
	94	struct inode *inode = direntry->d_inode;
	95	int rc = -EACCES;
	96	int xid;
	97	char *full_path = NULL;
	98	char * target_path = ERR_PTR(-ENOMEM);
	99	struct cifs_sb_info *cifs_sb;
	100	struct cifsTconInfo *pTcon;
	101
	102	xid = GetXid();
	103
7f57356b	104	full_path = build_path_from_dentry(direntry);
1da177e4 LT	105
	106	if (!full_path)
	107	goto out_no_free;
	108
	109	cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
7f57356b SF	110	cifs_sb = CIFS_SB(inode->i_sb);
7f57356b SF	111	pTcon = cifs_sb->tcon;
1da177e4 LT	112	target_path = kmalloc(PATH_MAX, GFP_KERNEL);
	113	if (!target_path) {
	114	target_path = ERR_PTR(-ENOMEM);
	115	goto out;
	116	}
	117
	118	/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
	119	if (pTcon->ses->capabilities & CAP_UNIX)
	120	rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
	121	target_path,
	122	PATH_MAX-1,
	123	cifs_sb->local_nls);
	124	else {
	125	/* rc = CIFSSMBQueryReparseLinkInfo */
	126	/* BB Add code to Query ReparsePoint info */
	127	/* BB Add MAC style xsymlink check here if enabled */
	128	}
	129
	130	if (rc == 0) {
	131
	132	/* BB Add special case check for Samba DFS symlinks */
	133
	134	target_path[PATH_MAX-1] = 0;
	135	} else {
	136	kfree(target_path);
	137	target_path = ERR_PTR(rc);
	138	}
	139
	140	out:
	141	kfree(full_path);
	142	out_no_free:
	143	FreeXid(xid);
	144	nd_set_link(nd, target_path);
cc314eef	145	return NULL; /* No cookie */
1da177e4 LT	146	}
	147
	148	int
	149	cifs_symlink(struct inode inode, struct dentry direntry, const char *symname)
	150	{
	151	int rc = -EOPNOTSUPP;
	152	int xid;
	153	struct cifs_sb_info *cifs_sb;
	154	struct cifsTconInfo *pTcon;
	155	char *full_path = NULL;
	156	struct inode *newinode = NULL;
	157
	158	xid = GetXid();
	159
	160	cifs_sb = CIFS_SB(inode->i_sb);
	161	pTcon = cifs_sb->tcon;
	162
7f57356b	163	full_path = build_path_from_dentry(direntry);
1da177e4 LT	164
	165	if(full_path == NULL) {
	166	FreeXid(xid);
	167	return -ENOMEM;
	168	}
	169
	170	cFYI(1, ("Full path: %s ", full_path));
	171	cFYI(1, ("symname is %s", symname));
	172
	173	/* BB what if DFS and this volume is on different share? BB */
	174	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
	175	rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
	176	cifs_sb->local_nls);
	177	/* else
	178	rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
	179
	180	if (rc == 0) {
	181	if (pTcon->ses->capabilities & CAP_UNIX)
	182	rc = cifs_get_inode_info_unix(&newinode, full_path,
	183	inode->i_sb,xid);
	184	else
	185	rc = cifs_get_inode_info(&newinode, full_path, NULL,
	186	inode->i_sb,xid);
	187
	188	if (rc != 0) {
	189	cFYI(1,
	190	("Create symlink worked but get_inode_info failed with rc = %d ",
	191	rc));
	192	} else {
b92327fe SF	193	if (pTcon->nocase)
	194	direntry->d_op = &cifs_ci_dentry_ops;
	195	else
	196	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	197	d_instantiate(direntry, newinode);
	198	}
	199	}
	200
f99d49ad	201	kfree(full_path);
1da177e4 LT	202	FreeXid(xid);
	203	return rc;
	204	}
	205
	206	int
	207	cifs_readlink(struct dentry direntry, char __user pBuffer, int buflen)
	208	{
	209	struct inode *inode = direntry->d_inode;
	210	int rc = -EACCES;
	211	int xid;
	212	int oplock = FALSE;
	213	struct cifs_sb_info *cifs_sb;
	214	struct cifsTconInfo *pTcon;
	215	char *full_path = NULL;
	216	char *tmp_path = NULL;
	217	char * tmpbuffer;
	218	unsigned char * referrals = NULL;
	219	int num_referrals = 0;
	220	int len;
	221	__u16 fid;
	222
	223	xid = GetXid();
	224	cifs_sb = CIFS_SB(inode->i_sb);
	225	pTcon = cifs_sb->tcon;
	226
	227	/* BB would it be safe against deadlock to grab this sem
	228	even though rename itself grabs the sem and calls lookup? */
a11f3a05	229	/* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
7f57356b	230	full_path = build_path_from_dentry(direntry);
a11f3a05	231	/* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/
1da177e4 LT	232
	233	if(full_path == NULL) {
	234	FreeXid(xid);
	235	return -ENOMEM;
	236	}
	237
	238	cFYI(1,
	239	("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
	240	full_path, inode, pBuffer, buflen));
	241	if(buflen > PATH_MAX)
	242	len = PATH_MAX;
	243	else
	244	len = buflen;
	245	tmpbuffer = kmalloc(len,GFP_KERNEL);
	246	if(tmpbuffer == NULL) {
f99d49ad	247	kfree(full_path);
1da177e4 LT	248	FreeXid(xid);
	249	return -ENOMEM;
	250	}
	251
	252	/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
	253	if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
	254	rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
	255	tmpbuffer,
	256	len - 1,
	257	cifs_sb->local_nls);
	258	else {
	259	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
737b758c SF	260	OPEN_REPARSE_POINT,&fid, &oplock, NULL,
	261	cifs_sb->local_nls,
	262	cifs_sb->mnt_cifs_flags &
	263	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	264	if(!rc) {
	265	rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
	266	tmpbuffer,
	267	len - 1,
	268	fid,
	269	cifs_sb->local_nls);
	270	if(CIFSSMBClose(xid, pTcon, fid)) {
	271	cFYI(1,("Error closing junction point (open for ioctl)"));
	272	}
	273	if(rc == -EIO) {
	274	/* Query if DFS Junction */
	275	tmp_path =
	276	kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
	277	GFP_KERNEL);
	278	if (tmp_path) {
	279	strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
	280	strncat(tmp_path, full_path, MAX_PATHCONF);
	281	rc = get_dfs_path(xid, pTcon->ses, tmp_path,
737b758c SF	282	cifs_sb->local_nls,
	283	&num_referrals, &referrals,
	284	cifs_sb->mnt_cifs_flags &
	285	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	286	cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
	287	if((num_referrals == 0) && (rc == 0))
	288	rc = -EACCES;
	289	else {
	290	cFYI(1,("num referral: %d",num_referrals));
	291	if(referrals) {
	292	cFYI(1,("referral string: %s ",referrals));
	293	strncpy(tmpbuffer, referrals, len-1);
	294	}
	295	}
f99d49ad	296	kfree(referrals);
1da177e4 LT	297	kfree(tmp_path);
	298	}
	299	/* BB add code like else decode referrals then memcpy to
	300	tmpbuffer and free referrals string array BB */
	301	}
	302	}
	303	}
	304	/* BB Anything else to do to handle recursive links? */
	305	/* BB Should we be using page ops here? */
	306
	307	/* BB null terminate returned string in pBuffer? BB */
	308	if (rc == 0) {
	309	rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
	310	cFYI(1,
	311	("vfs_readlink called from cifs_readlink returned %d",
	312	rc));
	313	}
	314
f99d49ad JJ	315	kfree(tmpbuffer);
f99d49ad JJ	316	kfree(full_path);
1da177e4 LT	317	FreeXid(xid);
	318	return rc;
	319	}
	320
cc314eef	321	void cifs_put_link(struct dentry direntry, struct nameidata nd, void *cookie)
1da177e4 LT	322	{
	323	char *p = nd_get_link(nd);
	324	if (!IS_ERR(p))
	325	kfree(p);
	326	}