1 files changed, 523 insertions, 0 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
new file mode 100644
index 0000000..f54e186
--- /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 */
+};