840 lines
23 KiB
C
840 lines
23 KiB
C
/*
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* fs/cifs/dir.c
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*
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* vfs operations that deal with dentries
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*
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* Copyright (C) International Business Machines Corp., 2002,2009
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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/slab.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/file.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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static void
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renew_parental_timestamps(struct dentry *direntry)
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{
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/* BB check if there is a way to get the kernel to do this or if we
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really need this */
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do {
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direntry->d_time = jiffies;
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direntry = direntry->d_parent;
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} while (!IS_ROOT(direntry));
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}
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/* Note: caller must free return buffer */
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char *
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build_path_from_dentry(struct dentry *direntry)
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{
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struct dentry *temp;
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int namelen;
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int pplen;
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int dfsplen;
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char *full_path;
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char dirsep;
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
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if (direntry == NULL)
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return NULL; /* not much we can do if dentry is freed and
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we need to reopen the file after it was closed implicitly
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when the server crashed */
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dirsep = CIFS_DIR_SEP(cifs_sb);
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pplen = cifs_sb->prepathlen;
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if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
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dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
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else
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dfsplen = 0;
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cifs_bp_rename_retry:
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namelen = pplen + dfsplen;
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for (temp = direntry; !IS_ROOT(temp);) {
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namelen += (1 + temp->d_name.len);
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temp = temp->d_parent;
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if (temp == NULL) {
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cERROR(1, "corrupt dentry");
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return NULL;
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}
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}
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full_path = kmalloc(namelen+1, GFP_KERNEL);
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if (full_path == NULL)
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return full_path;
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full_path[namelen] = 0; /* trailing null */
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for (temp = direntry; !IS_ROOT(temp);) {
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namelen -= 1 + temp->d_name.len;
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if (namelen < 0) {
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break;
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} else {
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full_path[namelen] = dirsep;
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strncpy(full_path + namelen + 1, temp->d_name.name,
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temp->d_name.len);
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cFYI(0, "name: %s", full_path + namelen);
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}
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temp = temp->d_parent;
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if (temp == NULL) {
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cERROR(1, "corrupt dentry");
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kfree(full_path);
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return NULL;
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}
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}
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if (namelen != pplen + dfsplen) {
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cERROR(1, "did not end path lookup where expected namelen is %d",
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namelen);
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/* presumably this is only possible if racing with a rename
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of one of the parent directories (we can not lock the dentries
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above us to prevent this, but retrying should be harmless) */
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kfree(full_path);
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goto cifs_bp_rename_retry;
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}
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/* DIR_SEP already set for byte 0 / vs \ but not for
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subsequent slashes in prepath which currently must
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be entered the right way - not sure if there is an alternative
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since the '\' is a valid posix character so we can not switch
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those safely to '/' if any are found in the middle of the prepath */
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/* BB test paths to Windows with '/' in the midst of prepath */
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if (dfsplen) {
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strncpy(full_path, tcon->treeName, dfsplen);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
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int i;
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for (i = 0; i < dfsplen; i++) {
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if (full_path[i] == '\\')
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full_path[i] = '/';
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}
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}
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}
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strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
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return full_path;
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}
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struct cifsFileInfo *
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cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
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struct vfsmount *mnt, struct cifsTconInfo *tcon,
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unsigned int oflags, __u32 oplock)
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{
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struct cifsFileInfo *pCifsFile;
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struct cifsInodeInfo *pCifsInode;
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struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb);
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pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
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if (pCifsFile == NULL)
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return pCifsFile;
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pCifsFile->netfid = fileHandle;
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pCifsFile->pid = current->tgid;
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pCifsFile->pInode = igrab(newinode);
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pCifsFile->mnt = mnt;
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pCifsFile->pfile = file;
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pCifsFile->invalidHandle = false;
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pCifsFile->closePend = false;
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pCifsFile->tcon = tcon;
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mutex_init(&pCifsFile->fh_mutex);
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mutex_init(&pCifsFile->lock_mutex);
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INIT_LIST_HEAD(&pCifsFile->llist);
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atomic_set(&pCifsFile->count, 1);
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INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
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write_lock(&GlobalSMBSeslock);
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list_add(&pCifsFile->tlist, &tcon->openFileList);
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pCifsInode = CIFS_I(newinode);
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if (pCifsInode) {
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/* if readable file instance put first in list*/
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if (oflags & FMODE_READ)
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list_add(&pCifsFile->flist, &pCifsInode->openFileList);
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else
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list_add_tail(&pCifsFile->flist,
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&pCifsInode->openFileList);
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if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
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pCifsInode->clientCanCacheAll = true;
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pCifsInode->clientCanCacheRead = true;
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cFYI(1, "Exclusive Oplock inode %p", newinode);
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} else if ((oplock & 0xF) == OPLOCK_READ)
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pCifsInode->clientCanCacheRead = true;
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}
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write_unlock(&GlobalSMBSeslock);
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file->private_data = pCifsFile;
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return pCifsFile;
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}
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int cifs_posix_open(char *full_path, struct inode **pinode,
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struct super_block *sb, int mode, int oflags,
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__u32 *poplock, __u16 *pnetfid, int xid)
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{
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int rc;
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FILE_UNIX_BASIC_INFO *presp_data;
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__u32 posix_flags = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifs_fattr fattr;
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struct cifsTconInfo *tcon = cifs_sb_tcon(cifs_sb);
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cFYI(1, "posix open %s", full_path);
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presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
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if (presp_data == NULL)
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return -ENOMEM;
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/* So far cifs posix extensions can only map the following flags.
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There are other valid fmode oflags such as FMODE_LSEEK, FMODE_PREAD, but
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so far we do not seem to need them, and we can treat them as local only */
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if ((oflags & (FMODE_READ | FMODE_WRITE)) ==
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(FMODE_READ | FMODE_WRITE))
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posix_flags = SMB_O_RDWR;
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else if (oflags & FMODE_READ)
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posix_flags = SMB_O_RDONLY;
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else if (oflags & FMODE_WRITE)
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posix_flags = SMB_O_WRONLY;
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if (oflags & O_CREAT)
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posix_flags |= SMB_O_CREAT;
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if (oflags & O_EXCL)
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posix_flags |= SMB_O_EXCL;
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if (oflags & O_TRUNC)
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posix_flags |= SMB_O_TRUNC;
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/* be safe and imply O_SYNC for O_DSYNC */
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if (oflags & O_DSYNC)
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posix_flags |= SMB_O_SYNC;
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if (oflags & O_DIRECTORY)
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posix_flags |= SMB_O_DIRECTORY;
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if (oflags & O_NOFOLLOW)
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posix_flags |= SMB_O_NOFOLLOW;
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if (oflags & O_DIRECT)
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posix_flags |= SMB_O_DIRECT;
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mode &= ~current_umask();
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rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
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poplock, full_path, 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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goto posix_open_ret;
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if (presp_data->Type == cpu_to_le32(-1))
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goto posix_open_ret; /* open ok, caller does qpathinfo */
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if (!pinode)
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goto posix_open_ret; /* caller does not need info */
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cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
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/* get new inode and set it up */
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if (*pinode == NULL) {
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cifs_fill_uniqueid(sb, &fattr);
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*pinode = cifs_iget(sb, &fattr);
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if (!*pinode) {
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rc = -ENOMEM;
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goto posix_open_ret;
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}
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} else {
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cifs_fattr_to_inode(*pinode, &fattr);
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}
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posix_open_ret:
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kfree(presp_data);
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return rc;
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}
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static void setup_cifs_dentry(struct cifsTconInfo *tcon,
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struct dentry *direntry,
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struct inode *newinode)
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{
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if (tcon->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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/* Inode operations in similar order to how they appear in Linux file fs.h */
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int
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cifs_create(struct inode *inode, struct dentry *direntry, int mode,
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struct nameidata *nd)
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{
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int rc = -ENOENT;
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int xid;
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int create_options = CREATE_NOT_DIR;
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__u32 oplock = 0;
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int oflags;
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/*
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* BB below access is probably too much for mknod to request
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* but we have to do query and setpathinfo so requesting
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* less could fail (unless we want to request getatr and setatr
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* permissions (only). At least for POSIX we do not have to
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* request so much.
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*/
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int desiredAccess = GENERIC_READ | GENERIC_WRITE;
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__u16 fileHandle;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *tcon;
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char *full_path = NULL;
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FILE_ALL_INFO *buf = NULL;
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struct inode *newinode = NULL;
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int disposition = FILE_OVERWRITE_IF;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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tcon = cifs_sb_tcon(cifs_sb);
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full_path = build_path_from_dentry(direntry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto cifs_create_out;
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}
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if (oplockEnabled)
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oplock = REQ_OPLOCK;
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if (nd && (nd->flags & LOOKUP_OPEN))
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oflags = nd->intent.open.flags;
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else
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oflags = FMODE_READ | SMB_O_CREAT;
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if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
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(CIFS_UNIX_POSIX_PATH_OPS_CAP &
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le64_to_cpu(tcon->fsUnixInfo.Capability))) {
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rc = cifs_posix_open(full_path, &newinode,
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inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
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/* EIO could indicate that (posix open) operation is not
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supported, despite what server claimed in capability
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negotation. EREMOTE indicates DFS junction, which is not
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handled in posix open */
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if (rc == 0) {
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if (newinode == NULL) /* query inode info */
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goto cifs_create_get_file_info;
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else /* success, no need to query */
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goto cifs_create_set_dentry;
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} else if ((rc != -EIO) && (rc != -EREMOTE) &&
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(rc != -EOPNOTSUPP) && (rc != -EINVAL))
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goto cifs_create_out;
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/* else fallthrough to retry, using older open call, this is
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case where server does not support this SMB level, and
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falsely claims capability (also get here for DFS case
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which should be rare for path not covered on files) */
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}
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if (nd && (nd->flags & LOOKUP_OPEN)) {
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/* if the file is going to stay open, then we
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need to set the desired access properly */
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desiredAccess = 0;
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if (oflags & FMODE_READ)
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desiredAccess |= GENERIC_READ; /* is this too little? */
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if (oflags & FMODE_WRITE)
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desiredAccess |= GENERIC_WRITE;
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if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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disposition = FILE_CREATE;
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else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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disposition = FILE_OVERWRITE_IF;
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else if ((oflags & O_CREAT) == O_CREAT)
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disposition = FILE_OPEN_IF;
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else
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cFYI(1, "Create flag not set in create function");
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}
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/* BB add processing to set equivalent of mode - e.g. via CreateX with
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ACLs */
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buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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if (buf == NULL) {
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rc = -ENOMEM;
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goto cifs_create_out;
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}
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/*
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* if we're not using unix extensions, see if we need to set
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* ATTR_READONLY on the create call
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*/
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if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
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create_options |= CREATE_OPTION_READONLY;
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if (tcon->ses->capabilities & CAP_NT_SMBS)
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rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
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desiredAccess, create_options,
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&fileHandle, &oplock, buf, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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else
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rc = -EIO; /* no NT SMB support fall into legacy open below */
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if (rc == -EIO) {
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/* old server, retry the open legacy style */
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rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
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desiredAccess, create_options,
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&fileHandle, &oplock, buf, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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}
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if (rc) {
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cFYI(1, "cifs_create returned 0x%x", rc);
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goto cifs_create_out;
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}
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/* If Open reported that we actually created a file
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then we now have to set the mode if possible */
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if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
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struct cifs_unix_set_info_args args = {
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.mode = mode,
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.ctime = NO_CHANGE_64,
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.atime = NO_CHANGE_64,
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.mtime = NO_CHANGE_64,
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.device = 0,
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};
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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args.uid = (__u64) current_fsuid();
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if (inode->i_mode & S_ISGID)
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args.gid = (__u64) inode->i_gid;
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else
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args.gid = (__u64) current_fsgid();
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} else {
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args.uid = NO_CHANGE_64;
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args.gid = NO_CHANGE_64;
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}
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CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
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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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} else {
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/* BB implement mode setting via Windows security
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descriptors e.g. */
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/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
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/* Could set r/o dos attribute if mode & 0222 == 0 */
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}
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cifs_create_get_file_info:
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/* server might mask mode so we have to query for it */
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if (tcon->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, buf,
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inode->i_sb, xid, &fileHandle);
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if (newinode) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
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newinode->i_mode = mode;
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if ((oplock & CIFS_CREATE_ACTION) &&
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(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
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newinode->i_uid = current_fsuid();
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if (inode->i_mode & S_ISGID)
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newinode->i_gid = inode->i_gid;
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else
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newinode->i_gid = current_fsgid();
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}
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}
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}
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cifs_create_set_dentry:
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if (rc == 0)
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setup_cifs_dentry(tcon, direntry, newinode);
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else
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cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
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if (newinode && nd && (nd->flags & LOOKUP_OPEN)) {
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struct cifsFileInfo *pfile_info;
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struct file *filp;
|
|
|
|
filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
|
|
if (IS_ERR(filp)) {
|
|
rc = PTR_ERR(filp);
|
|
CIFSSMBClose(xid, tcon, fileHandle);
|
|
goto cifs_create_out;
|
|
}
|
|
|
|
pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
|
|
nd->path.mnt, tcon, oflags,
|
|
oplock);
|
|
if (pfile_info == NULL) {
|
|
fput(filp);
|
|
CIFSSMBClose(xid, tcon, fileHandle);
|
|
rc = -ENOMEM;
|
|
}
|
|
} else {
|
|
CIFSSMBClose(xid, tcon, fileHandle);
|
|
}
|
|
|
|
cifs_create_out:
|
|
kfree(buf);
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
|
|
dev_t device_number)
|
|
{
|
|
int rc = -EPERM;
|
|
int xid;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
char *full_path = NULL;
|
|
struct inode *newinode = NULL;
|
|
int oplock = 0;
|
|
u16 fileHandle;
|
|
FILE_ALL_INFO *buf = NULL;
|
|
unsigned int bytes_written;
|
|
struct win_dev *pdev;
|
|
|
|
if (!old_valid_dev(device_number))
|
|
return -EINVAL;
|
|
|
|
xid = GetXid();
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb_tcon(cifs_sb);
|
|
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (full_path == NULL) {
|
|
rc = -ENOMEM;
|
|
goto mknod_out;
|
|
}
|
|
|
|
if (pTcon->unix_ext) {
|
|
struct cifs_unix_set_info_args args = {
|
|
.mode = mode & ~current_umask(),
|
|
.ctime = NO_CHANGE_64,
|
|
.atime = NO_CHANGE_64,
|
|
.mtime = NO_CHANGE_64,
|
|
.device = device_number,
|
|
};
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
|
|
args.uid = (__u64) current_fsuid();
|
|
args.gid = (__u64) current_fsgid();
|
|
} else {
|
|
args.uid = NO_CHANGE_64;
|
|
args.gid = NO_CHANGE_64;
|
|
}
|
|
rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc)
|
|
goto mknod_out;
|
|
|
|
rc = cifs_get_inode_info_unix(&newinode, full_path,
|
|
inode->i_sb, xid);
|
|
if (pTcon->nocase)
|
|
direntry->d_op = &cifs_ci_dentry_ops;
|
|
else
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
|
|
if (rc == 0)
|
|
d_instantiate(direntry, newinode);
|
|
goto mknod_out;
|
|
}
|
|
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
|
|
goto mknod_out;
|
|
|
|
|
|
cFYI(1, "sfu compat create special file");
|
|
|
|
buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
|
if (buf == NULL) {
|
|
kfree(full_path);
|
|
rc = -ENOMEM;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* FIXME: would WRITE_OWNER | WRITE_DAC be better? */
|
|
rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
|
|
GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
|
|
&fileHandle, &oplock, buf, cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc)
|
|
goto mknod_out;
|
|
|
|
/* BB Do not bother to decode buf since no local inode yet to put
|
|
* timestamps in, but we can reuse it safely */
|
|
|
|
pdev = (struct win_dev *)buf;
|
|
if (S_ISCHR(mode)) {
|
|
memcpy(pdev->type, "IntxCHR", 8);
|
|
pdev->major =
|
|
cpu_to_le64(MAJOR(device_number));
|
|
pdev->minor =
|
|
cpu_to_le64(MINOR(device_number));
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
|
fileHandle,
|
|
sizeof(struct win_dev),
|
|
0, &bytes_written, (char *)pdev,
|
|
NULL, 0);
|
|
} else if (S_ISBLK(mode)) {
|
|
memcpy(pdev->type, "IntxBLK", 8);
|
|
pdev->major =
|
|
cpu_to_le64(MAJOR(device_number));
|
|
pdev->minor =
|
|
cpu_to_le64(MINOR(device_number));
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
|
fileHandle,
|
|
sizeof(struct win_dev),
|
|
0, &bytes_written, (char *)pdev,
|
|
NULL, 0);
|
|
} /* else if (S_ISFIFO) */
|
|
CIFSSMBClose(xid, pTcon, fileHandle);
|
|
d_drop(direntry);
|
|
|
|
/* FIXME: add code here to set EAs */
|
|
|
|
mknod_out:
|
|
kfree(full_path);
|
|
kfree(buf);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
struct dentry *
|
|
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
|
|
struct nameidata *nd)
|
|
{
|
|
int xid;
|
|
int rc = 0; /* to get around spurious gcc warning, set to zero here */
|
|
__u32 oplock = 0;
|
|
__u16 fileHandle = 0;
|
|
bool posix_open = false;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
struct cifsFileInfo *cfile;
|
|
struct inode *newInode = NULL;
|
|
char *full_path = NULL;
|
|
struct file *filp;
|
|
|
|
xid = GetXid();
|
|
|
|
cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
|
|
parent_dir_inode, direntry->d_name.name, direntry);
|
|
|
|
/* check whether path exists */
|
|
|
|
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
|
|
pTcon = cifs_sb_tcon(cifs_sb);
|
|
|
|
/*
|
|
* Don't allow the separator character in a path component.
|
|
* The VFS will not allow "/", but "\" is allowed by posix.
|
|
*/
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
|
|
int i;
|
|
for (i = 0; i < direntry->d_name.len; i++)
|
|
if (direntry->d_name.name[i] == '\\') {
|
|
cFYI(1, "Invalid file name");
|
|
FreeXid(xid);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* O_EXCL: optimize away the lookup, but don't hash the dentry. Let
|
|
* the VFS handle the create.
|
|
*/
|
|
if (nd && (nd->flags & LOOKUP_EXCL)) {
|
|
d_instantiate(direntry, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
/* can not grab the rename sem here since it would
|
|
deadlock in the cases (beginning of sys_rename itself)
|
|
in which we already have the sb rename sem */
|
|
full_path = build_path_from_dentry(direntry);
|
|
if (full_path == NULL) {
|
|
FreeXid(xid);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
if (direntry->d_inode != NULL) {
|
|
cFYI(1, "non-NULL inode in lookup");
|
|
} else {
|
|
cFYI(1, "NULL inode in lookup");
|
|
}
|
|
cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
|
|
|
|
/* Posix open is only called (at lookup time) for file create now.
|
|
* For opens (rather than creates), because we do not know if it
|
|
* is a file or directory yet, and current Samba no longer allows
|
|
* us to do posix open on dirs, we could end up wasting an open call
|
|
* on what turns out to be a dir. For file opens, we wait to call posix
|
|
* open till cifs_open. It could be added here (lookup) in the future
|
|
* but the performance tradeoff of the extra network request when EISDIR
|
|
* or EACCES is returned would have to be weighed against the 50%
|
|
* reduction in network traffic in the other paths.
|
|
*/
|
|
if (pTcon->unix_ext) {
|
|
if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
|
|
(nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
|
|
(nd->intent.open.flags & O_CREAT)) {
|
|
rc = cifs_posix_open(full_path, &newInode,
|
|
parent_dir_inode->i_sb,
|
|
nd->intent.open.create_mode,
|
|
nd->intent.open.flags, &oplock,
|
|
&fileHandle, xid);
|
|
/*
|
|
* The check below works around a bug in POSIX
|
|
* open in samba versions 3.3.1 and earlier where
|
|
* open could incorrectly fail with invalid parameter.
|
|
* If either that or op not supported returned, follow
|
|
* the normal lookup.
|
|
*/
|
|
if ((rc == 0) || (rc == -ENOENT))
|
|
posix_open = true;
|
|
else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
|
|
pTcon->broken_posix_open = true;
|
|
}
|
|
if (!posix_open)
|
|
rc = cifs_get_inode_info_unix(&newInode, full_path,
|
|
parent_dir_inode->i_sb, xid);
|
|
} else
|
|
rc = cifs_get_inode_info(&newInode, full_path, NULL,
|
|
parent_dir_inode->i_sb, xid, NULL);
|
|
|
|
if ((rc == 0) && (newInode != NULL)) {
|
|
if (pTcon->nocase)
|
|
direntry->d_op = &cifs_ci_dentry_ops;
|
|
else
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
d_add(direntry, newInode);
|
|
if (posix_open) {
|
|
filp = lookup_instantiate_filp(nd, direntry,
|
|
generic_file_open);
|
|
if (IS_ERR(filp)) {
|
|
rc = PTR_ERR(filp);
|
|
CIFSSMBClose(xid, pTcon, fileHandle);
|
|
goto lookup_out;
|
|
}
|
|
|
|
cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
|
|
nd->path.mnt, pTcon,
|
|
nd->intent.open.flags,
|
|
oplock);
|
|
if (cfile == NULL) {
|
|
fput(filp);
|
|
CIFSSMBClose(xid, pTcon, fileHandle);
|
|
rc = -ENOMEM;
|
|
goto lookup_out;
|
|
}
|
|
}
|
|
/* since paths are not looked up by component - the parent
|
|
directories are presumed to be good here */
|
|
renew_parental_timestamps(direntry);
|
|
|
|
} else if (rc == -ENOENT) {
|
|
rc = 0;
|
|
direntry->d_time = jiffies;
|
|
if (pTcon->nocase)
|
|
direntry->d_op = &cifs_ci_dentry_ops;
|
|
else
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
d_add(direntry, NULL);
|
|
/* if it was once a directory (but how can we tell?) we could do
|
|
shrink_dcache_parent(direntry); */
|
|
} else if (rc != -EACCES) {
|
|
cERROR(1, "Unexpected lookup error %d", rc);
|
|
/* We special case check for Access Denied - since that
|
|
is a common return code */
|
|
}
|
|
|
|
lookup_out:
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int
|
|
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
|
|
{
|
|
int isValid = 1;
|
|
|
|
if (direntry->d_inode) {
|
|
if (cifs_revalidate_dentry(direntry))
|
|
return 0;
|
|
} else {
|
|
cFYI(1, "neg dentry 0x%p name = %s",
|
|
direntry, direntry->d_name.name);
|
|
if (time_after(jiffies, direntry->d_time + HZ) ||
|
|
!lookupCacheEnabled) {
|
|
d_drop(direntry);
|
|
isValid = 0;
|
|
}
|
|
}
|
|
|
|
return isValid;
|
|
}
|
|
|
|
/* static int cifs_d_delete(struct dentry *direntry)
|
|
{
|
|
int rc = 0;
|
|
|
|
cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
|
|
|
|
return rc;
|
|
} */
|
|
|
|
const struct dentry_operations cifs_dentry_ops = {
|
|
.d_revalidate = cifs_d_revalidate,
|
|
/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
|
|
};
|
|
|
|
static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
|
|
{
|
|
struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
|
|
unsigned long hash;
|
|
int i;
|
|
|
|
hash = init_name_hash();
|
|
for (i = 0; i < q->len; i++)
|
|
hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
|
|
hash);
|
|
q->hash = end_name_hash(hash);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
|
|
struct qstr *b)
|
|
{
|
|
struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
|
|
|
|
if ((a->len == b->len) &&
|
|
(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
|
|
/*
|
|
* To preserve case, don't let an existing negative dentry's
|
|
* case take precedence. If a is not a negative dentry, this
|
|
* should have no side effects
|
|
*/
|
|
memcpy((void *)a->name, b->name, a->len);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
const struct dentry_operations cifs_ci_dentry_ops = {
|
|
.d_revalidate = cifs_d_revalidate,
|
|
.d_hash = cifs_ci_hash,
|
|
.d_compare = cifs_ci_compare,
|
|
};
|