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-rw-r--r--fs/cifs/dir.c523
1 files changed, 523 insertions, 0 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
new file mode 100644
index 000000000000..f54e1866f0f4
--- /dev/null
+++ b/fs/cifs/dir.c
@@ -0,0 +1,523 @@
+/*
+ * fs/cifs/dir.c
+ *
+ * vfs operations that deal with dentries
+ *
+ * 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 <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/slab.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"
+
+void
+renew_parental_timestamps(struct dentry *direntry)
+{
+ /* BB check if there is a way to get the kernel to do this or if we really need this */
+ do {
+ direntry->d_time = jiffies;
+ direntry = direntry->d_parent;
+ } while (!IS_ROOT(direntry));
+}
+
+/* Note: caller must free return buffer */
+char *
+build_path_from_dentry(struct dentry *direntry)
+{
+ struct dentry *temp;
+ int namelen = 0;
+ char *full_path;
+
+ if(direntry == NULL)
+ return NULL; /* not much we can do if dentry is freed and
+ we need to reopen the file after it was closed implicitly
+ when the server crashed */
+
+cifs_bp_rename_retry:
+ for (temp = direntry; !IS_ROOT(temp);) {
+ namelen += (1 + temp->d_name.len);
+ temp = temp->d_parent;
+ if(temp == NULL) {
+ cERROR(1,("corrupt dentry"));
+ return NULL;
+ }
+ }
+
+ full_path = kmalloc(namelen+1, GFP_KERNEL);
+ if(full_path == NULL)
+ return full_path;
+ full_path[namelen] = 0; /* trailing null */
+
+ for (temp = direntry; !IS_ROOT(temp);) {
+ namelen -= 1 + temp->d_name.len;
+ if (namelen < 0) {
+ break;
+ } else {
+ full_path[namelen] = '\\';
+ strncpy(full_path + namelen + 1, temp->d_name.name,
+ temp->d_name.len);
+ cFYI(0, (" name: %s ", full_path + namelen));
+ }
+ temp = temp->d_parent;
+ if(temp == NULL) {
+ cERROR(1,("corrupt dentry"));
+ kfree(full_path);
+ return NULL;
+ }
+ }
+ if (namelen != 0) {
+ cERROR(1,
+ ("We did not end path lookup where we expected namelen is %d",
+ namelen));
+ /* presumably this is only possible if we were racing with a rename
+ of one of the parent directories (we can not lock the dentries
+ above us to prevent this, but retrying should be harmless) */
+ kfree(full_path);
+ namelen = 0;
+ goto cifs_bp_rename_retry;
+ }
+
+ return full_path;
+}
+
+/* Note: caller must free return buffer */
+char *
+build_wildcard_path_from_dentry(struct dentry *direntry)
+{
+ struct dentry *temp;
+ int namelen = 0;
+ char *full_path;
+
+ if(direntry == NULL)
+ return NULL; /* not much we can do if dentry is freed and
+ we need to reopen the file after it was closed implicitly
+ when the server crashed */
+
+cifs_bwp_rename_retry:
+ for (temp = direntry; !IS_ROOT(temp);) {
+ namelen += (1 + temp->d_name.len);
+ temp = temp->d_parent;
+ if(temp == NULL) {
+ cERROR(1,("corrupt dentry"));
+ return NULL;
+ }
+ }
+
+ full_path = kmalloc(namelen+3, GFP_KERNEL);
+ if(full_path == NULL)
+ return full_path;
+
+ full_path[namelen] = '\\';
+ full_path[namelen+1] = '*';
+ full_path[namelen+2] = 0; /* trailing null */
+
+ for (temp = direntry; !IS_ROOT(temp);) {
+ namelen -= 1 + temp->d_name.len;
+ if (namelen < 0) {
+ break;
+ } else {
+ full_path[namelen] = '\\';
+ strncpy(full_path + namelen + 1, temp->d_name.name,
+ temp->d_name.len);
+ cFYI(0, (" name: %s ", full_path + namelen));
+ }
+ temp = temp->d_parent;
+ if(temp == NULL) {
+ cERROR(1,("corrupt dentry"));
+ kfree(full_path);
+ return NULL;
+ }
+ }
+ if (namelen != 0) {
+ cERROR(1,
+ ("We did not end path lookup where we expected namelen is %d",
+ namelen));
+ /* presumably this is only possible if we were racing with a rename
+ of one of the parent directories (we can not lock the dentries
+ above us to prevent this, but retrying should be harmless) */
+ kfree(full_path);
+ namelen = 0;
+ goto cifs_bwp_rename_retry;
+ }
+
+ return full_path;
+}
+
+/* Inode operations in similar order to how they appear in the Linux file fs.h */
+
+int
+cifs_create(struct inode *inode, struct dentry *direntry, int mode,
+ struct nameidata *nd)
+{
+ int rc = -ENOENT;
+ int xid;
+ int oplock = 0;
+ int desiredAccess = GENERIC_READ | GENERIC_WRITE;
+ __u16 fileHandle;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+ char *full_path = NULL;
+ FILE_ALL_INFO * buf = NULL;
+ struct inode *newinode = NULL;
+ struct cifsFileInfo * pCifsFile = NULL;
+ struct cifsInodeInfo * pCifsInode;
+ int disposition = FILE_OVERWRITE_IF;
+ int write_only = FALSE;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+ 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;
+ }
+
+ if(nd) {
+ if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
+ desiredAccess = GENERIC_READ;
+ else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
+ desiredAccess = GENERIC_WRITE;
+ write_only = TRUE;
+ } else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
+ /* GENERIC_ALL is too much permission to request */
+ /* can cause unnecessary access denied on create */
+ /* desiredAccess = GENERIC_ALL; */
+ desiredAccess = GENERIC_READ | GENERIC_WRITE;
+ }
+
+ if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ disposition = FILE_CREATE;
+ else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
+ disposition = FILE_OVERWRITE_IF;
+ else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
+ disposition = FILE_OPEN_IF;
+ else {
+ cFYI(1,("Create flag not set in create function"));
+ }
+ }
+
+ /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
+ if (oplockEnabled)
+ oplock = REQ_OPLOCK;
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
+ if(buf == NULL) {
+ kfree(full_path);
+ FreeXid(xid);
+ return -ENOMEM;
+ }
+
+ rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
+ desiredAccess, CREATE_NOT_DIR,
+ &fileHandle, &oplock, buf, cifs_sb->local_nls);
+ if (rc) {
+ cFYI(1, ("cifs_create returned 0x%x ", rc));
+ } else {
+ /* If Open reported that we actually created a file
+ then we now have to set the mode if possible */
+ if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
+ (oplock & CIFS_CREATE_ACTION))
+ if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
+ (__u64)current->euid,
+ (__u64)current->egid,
+ 0 /* dev */,
+ cifs_sb->local_nls);
+ } else {
+ CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
+ (__u64)-1,
+ (__u64)-1,
+ 0 /* dev */,
+ cifs_sb->local_nls);
+ }
+ else {
+ /* BB implement via Windows security descriptors */
+ /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
+ /* could set r/o dos attribute if mode & 0222 == 0 */
+ }
+
+ /* BB server might mask mode so we have to query for Unix case*/
+ 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,
+ buf, inode->i_sb,xid);
+ if(newinode)
+ newinode->i_mode = mode;
+ }
+
+ if (rc != 0) {
+ cFYI(1,("Create worked but get_inode_info failed with rc = %d",
+ rc));
+ } else {
+ direntry->d_op = &cifs_dentry_ops;
+ d_instantiate(direntry, newinode);
+ }
+ if((nd->flags & LOOKUP_OPEN) == FALSE) {
+ /* mknod case - do not leave file open */
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ } else if(newinode) {
+ pCifsFile = (struct cifsFileInfo *)
+ kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
+
+ if (pCifsFile) {
+ memset((char *)pCifsFile, 0,
+ sizeof (struct cifsFileInfo));
+ pCifsFile->netfid = fileHandle;
+ pCifsFile->pid = current->tgid;
+ pCifsFile->pInode = newinode;
+ pCifsFile->invalidHandle = FALSE;
+ pCifsFile->closePend = FALSE;
+ init_MUTEX(&pCifsFile->fh_sem);
+ /* put the following in at open now */
+ /* pCifsFile->pfile = file; */
+ write_lock(&GlobalSMBSeslock);
+ list_add(&pCifsFile->tlist,&pTcon->openFileList);
+ pCifsInode = CIFS_I(newinode);
+ if(pCifsInode) {
+ /* if readable file instance put first in list*/
+ if (write_only == TRUE) {
+ list_add_tail(&pCifsFile->flist,
+ &pCifsInode->openFileList);
+ } else {
+ list_add(&pCifsFile->flist,
+ &pCifsInode->openFileList);
+ }
+ if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
+ pCifsInode->clientCanCacheAll = TRUE;
+ pCifsInode->clientCanCacheRead = TRUE;
+ cFYI(1,("Exclusive Oplock granted on inode %p",
+ newinode));
+ } else if((oplock & 0xF) == OPLOCK_READ)
+ pCifsInode->clientCanCacheRead = TRUE;
+ }
+ write_unlock(&GlobalSMBSeslock);
+ }
+ }
+ }
+
+ if (buf)
+ kfree(buf);
+ if (full_path)
+ 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;
+
+ if (!old_valid_dev(device_number))
+ return -EINVAL;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+ 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)
+ rc = -ENOMEM;
+
+ if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
+ if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
+ mode,(__u64)current->euid,(__u64)current->egid,
+ device_number, cifs_sb->local_nls);
+ } else {
+ rc = CIFSSMBUnixSetPerms(xid, pTcon,
+ full_path, mode, (__u64)-1, (__u64)-1,
+ device_number, cifs_sb->local_nls);
+ }
+
+ if(!rc) {
+ rc = cifs_get_inode_info_unix(&newinode, full_path,
+ inode->i_sb,xid);
+ direntry->d_op = &cifs_dentry_ops;
+ if(rc == 0)
+ d_instantiate(direntry, newinode);
+ }
+ }
+
+ if (full_path)
+ kfree(full_path);
+ 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 */
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+ struct inode *newInode = NULL;
+ char *full_path = NULL;
+
+ xid = GetXid();
+
+ cFYI(1,
+ (" parent inode = 0x%p name is: %s and dentry = 0x%p",
+ parent_dir_inode, direntry->d_name.name, direntry));
+
+ /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
+
+ /* check whether path exists */
+
+ cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+ /* 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));
+
+ if (pTcon->ses->capabilities & CAP_UNIX)
+ 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);
+
+ if ((rc == 0) && (newInode != NULL)) {
+ direntry->d_op = &cifs_dentry_ops;
+ d_add(direntry, newInode);
+
+ /* 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;
+ d_add(direntry, NULL);
+ } else {
+ cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
+ /* BB special case check for Access Denied - watch security
+ exposure of returning dir info implicitly via different rc
+ if file exists or not but no access BB */
+ }
+
+ if (full_path)
+ kfree(full_path);
+ FreeXid(xid);
+ return ERR_PTR(rc);
+}
+
+int
+cifs_dir_open(struct inode *inode, struct file *file)
+{ /* NB: currently unused since searches are opened in readdir */
+ int rc = 0;
+ int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+ char *full_path = NULL;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+ if(file->f_dentry) {
+ down(&file->f_dentry->d_sb->s_vfs_rename_sem);
+ full_path = build_wildcard_path_from_dentry(file->f_dentry);
+ up(&file->f_dentry->d_sb->s_vfs_rename_sem);
+ } else {
+ FreeXid(xid);
+ return -EIO;
+ }
+
+ cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));
+
+ if (full_path)
+ kfree(full_path);
+ FreeXid(xid);
+ return rc;
+}
+
+static int
+cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
+{
+ int isValid = 1;
+
+/* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */
+
+ if (direntry->d_inode) {
+ if (cifs_revalidate(direntry)) {
+ /* unlock_kernel(); */
+ return 0;
+ }
+ } else {
+ cFYI(1,
+ ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
+ direntry->d_name.name, direntry));
+ }
+
+/* unlock_kernel(); */
+
+ 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;
+} */
+
+struct dentry_operations cifs_dentry_ops = {
+ .d_revalidate = cifs_d_revalidate,
+/* d_delete: cifs_d_delete, *//* not needed except for debugging */
+ /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 18:17:13 +0000