From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/linux/linux/fs/cifs/link.c | 328 +++++++++++++++++++++++++++++++++ 1 file changed, 328 insertions(+) create mode 100644 release/src/linux/linux/fs/cifs/link.c (limited to 'release/src/linux/linux/fs/cifs/link.c') diff --git a/release/src/linux/linux/fs/cifs/link.c b/release/src/linux/linux/fs/cifs/link.c new file mode 100644 index 00000000..d4e93724 --- /dev/null +++ b/release/src/linux/linux/fs/cifs/link.c @@ -0,0 +1,328 @@ +/* + * fs/cifs/link.c + * + * Copyright (C) International Business Machines Corp., 2002,2003 + * Author(s): Steve French (sfrench@us.ibm.com) + * + * 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 +#include +#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); + else { + rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, + cifs_sb_target->local_nls); + 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; +} + +int +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; + 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 == NULL) { + FreeXid(xid); + return -ENOMEM; + } + 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 == NULL) { + if (full_path) + kfree(full_path); + FreeXid(xid); + return -ENOMEM; + } + /* can not call the following line due to EFAULT in vfs_readlink which is presumably expecting a user space buffer */ + /* length = cifs_readlink(direntry,target_path, sizeof(target_path) - 1); */ + +/* 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 Anything else to do to handle recursive links? */ + /* BB Should we be using page symlink ops here? */ + + if (rc == 0) { + +/* BB Add special case check for Samba DFS symlinks */ + + target_path[PATH_MAX-1] = 0; + rc = vfs_follow_link(nd, target_path); + } + /* else EACCESS */ + + if (target_path) + kfree(target_path); + if (full_path) + kfree(full_path); + FreeXid(xid); + return rc; +} + +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 *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); + 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); + 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); + if(referrals) { + kfree(referrals); + } + } + /* 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; +} -- cgit v1.2.3-54-g00ecf