![Steve French](/assets/img/avatar_default.png)
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
362 lines
9.5 KiB
C
362 lines
9.5 KiB
C
/*
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* fs/cifs/link.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/namei.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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int
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cifs_hardlink(struct dentry *old_file, struct inode *inode,
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struct dentry *direntry)
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{
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int rc = -EACCES;
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int xid;
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char *fromName = NULL;
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char *toName = NULL;
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struct cifs_sb_info *cifs_sb_target;
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struct cifsTconInfo *pTcon;
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struct cifsInodeInfo *cifsInode;
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xid = GetXid();
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cifs_sb_target = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb_target->tcon;
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/* No need to check for cross device links since server will do that
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BB note DFS case in future though (when we may have to check) */
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fromName = build_path_from_dentry(old_file);
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toName = build_path_from_dentry(direntry);
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if ((fromName == NULL) || (toName == NULL)) {
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rc = -ENOMEM;
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goto cifs_hl_exit;
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}
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/* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
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if (pTcon->unix_ext)
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rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
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cifs_sb_target->local_nls,
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cifs_sb_target->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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else {
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rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
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cifs_sb_target->local_nls,
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cifs_sb_target->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if ((rc == -EIO) || (rc == -EINVAL))
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rc = -EOPNOTSUPP;
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}
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d_drop(direntry); /* force new lookup from server of target */
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/* if source file is cached (oplocked) revalidate will not go to server
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until the file is closed or oplock broken so update nlinks locally */
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if (old_file->d_inode) {
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cifsInode = CIFS_I(old_file->d_inode);
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if (rc == 0) {
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old_file->d_inode->i_nlink++;
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/* BB should we make this contingent on superblock flag NOATIME? */
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/* old_file->d_inode->i_ctime = CURRENT_TIME;*/
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/* parent dir timestamps will update from srv
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within a second, would it really be worth it
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to set the parent dir cifs inode time to zero
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to force revalidate (faster) for it too? */
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}
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/* if not oplocked will force revalidate to get info
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on source file from srv */
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cifsInode->time = 0;
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/* Will update parent dir timestamps from srv within a second.
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Would it really be worth it to set the parent dir (cifs
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inode) time field to zero to force revalidate on parent
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directory faster ie
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CIFS_I(inode)->time = 0; */
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}
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cifs_hl_exit:
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kfree(fromName);
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kfree(toName);
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FreeXid(xid);
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return rc;
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}
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void *
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cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
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{
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struct inode *inode = direntry->d_inode;
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int rc = -EACCES;
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int xid;
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char *full_path = NULL;
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char *target_path = ERR_PTR(-ENOMEM);
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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xid = GetXid();
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full_path = build_path_from_dentry(direntry);
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if (!full_path)
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goto out_no_free;
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cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
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cifs_sb = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb->tcon;
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target_path = kmalloc(PATH_MAX, GFP_KERNEL);
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if (!target_path) {
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target_path = ERR_PTR(-ENOMEM);
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goto out;
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}
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/* We could change this to:
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if (pTcon->unix_ext)
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but there does not seem any point in refusing to
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get symlink info if we can, even if unix extensions
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turned off for this mount */
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if (pTcon->ses->capabilities & CAP_UNIX)
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rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
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target_path,
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PATH_MAX-1,
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cifs_sb->local_nls);
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else {
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/* BB add read reparse point symlink code here */
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/* rc = CIFSSMBQueryReparseLinkInfo */
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/* BB Add code to Query ReparsePoint info */
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/* BB Add MAC style xsymlink check here if enabled */
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}
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if (rc == 0) {
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/* BB Add special case check for Samba DFS symlinks */
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target_path[PATH_MAX-1] = 0;
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} else {
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kfree(target_path);
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target_path = ERR_PTR(rc);
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}
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out:
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kfree(full_path);
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out_no_free:
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FreeXid(xid);
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nd_set_link(nd, target_path);
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return NULL; /* No cookie */
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}
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int
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cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
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{
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int rc = -EOPNOTSUPP;
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int xid;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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char *full_path = NULL;
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struct inode *newinode = NULL;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb->tcon;
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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FreeXid(xid);
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return -ENOMEM;
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}
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cFYI(1, ("Full path: %s", full_path));
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cFYI(1, ("symname is %s", symname));
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/* BB what if DFS and this volume is on different share? BB */
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if (pTcon->unix_ext)
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rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
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cifs_sb->local_nls);
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/* else
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rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
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cifs_sb_target->local_nls); */
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if (rc == 0) {
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if (pTcon->unix_ext)
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rc = cifs_get_inode_info_unix(&newinode, full_path,
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inode->i_sb, xid);
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else
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rc = cifs_get_inode_info(&newinode, full_path, NULL,
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inode->i_sb, xid, NULL);
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if (rc != 0) {
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cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
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rc));
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} else {
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if (pTcon->nocase)
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direntry->d_op = &cifs_ci_dentry_ops;
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else
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direntry->d_op = &cifs_dentry_ops;
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d_instantiate(direntry, newinode);
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}
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}
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kfree(full_path);
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FreeXid(xid);
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return rc;
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}
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int
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cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
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{
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struct inode *inode = direntry->d_inode;
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int rc = -EACCES;
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int xid;
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int oplock = 0;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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char *full_path = NULL;
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char *tmp_path = NULL;
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char *tmpbuffer;
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int len;
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__u16 fid;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb->tcon;
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/* BB would it be safe against deadlock to grab this sem
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even though rename itself grabs the sem and calls lookup? */
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/* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
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full_path = build_path_from_dentry(direntry);
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/* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/
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if (full_path == NULL) {
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FreeXid(xid);
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return -ENOMEM;
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}
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cFYI(1,
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("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
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full_path, inode, pBuffer, buflen));
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if (buflen > PATH_MAX)
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len = PATH_MAX;
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else
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len = buflen;
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tmpbuffer = kmalloc(len, GFP_KERNEL);
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if (tmpbuffer == NULL) {
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kfree(full_path);
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FreeXid(xid);
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return -ENOMEM;
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}
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/* BB add read reparse point symlink code and
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Unix extensions symlink code here BB */
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/* We could disable this based on pTcon->unix_ext flag instead ... but why? */
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if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
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rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
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tmpbuffer,
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len - 1,
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cifs_sb->local_nls);
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else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
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cERROR(1, ("SFU style symlinks not implemented yet"));
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/* add open and read as in fs/cifs/inode.c */
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} else {
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rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
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OPEN_REPARSE_POINT, &fid, &oplock, NULL,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (!rc) {
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rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
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tmpbuffer,
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len - 1,
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fid,
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cifs_sb->local_nls);
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if (CIFSSMBClose(xid, pTcon, fid)) {
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cFYI(1, ("Error closing junction point "
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"(open for ioctl)"));
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}
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/* BB unwind this long, nested function, or remove BB */
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if (rc == -EIO) {
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/* Query if DFS Junction */
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unsigned int num_referrals = 0;
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struct dfs_info3_param *refs = NULL;
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tmp_path =
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kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
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GFP_KERNEL);
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if (tmp_path) {
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strncpy(tmp_path, pTcon->treeName,
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MAX_TREE_SIZE);
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strncat(tmp_path, full_path,
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MAX_PATHCONF);
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rc = get_dfs_path(xid, pTcon->ses,
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tmp_path,
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cifs_sb->local_nls,
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&num_referrals, &refs,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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cFYI(1, ("Get DFS for %s rc = %d ",
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tmp_path, rc));
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if ((num_referrals == 0) && (rc == 0))
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rc = -EACCES;
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else {
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cFYI(1, ("num referral: %d",
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num_referrals));
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if (refs && refs->path_name) {
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strncpy(tmpbuffer,
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refs->path_name,
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len-1);
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}
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}
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kfree(refs);
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kfree(tmp_path);
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}
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/* BB add code like else decode referrals
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then memcpy to tmpbuffer and free referrals
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string array BB */
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}
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}
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}
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/* BB Anything else to do to handle recursive links? */
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/* BB Should we be using page ops here? */
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/* BB null terminate returned string in pBuffer? BB */
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if (rc == 0) {
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rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
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cFYI(1,
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("vfs_readlink called from cifs_readlink returned %d",
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rc));
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}
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kfree(tmpbuffer);
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kfree(full_path);
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FreeXid(xid);
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return rc;
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}
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void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
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{
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char *p = nd_get_link(nd);
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if (!IS_ERR(p))
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kfree(p);
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}
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