[CIFS] Remove unnecessary checks

file->f_path.dentry or file->f_path.dentry.d_inode can't be NULL since at
least ten years, similar for all but very few arguments passed in from the
VFS.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsfs.c

@@ -529,8 +529,7 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 		/* some applications poll for the file length in this strange
 		   way so we must seek to end on non-oplocked files by
 		   setting the revalidate time to zero */
-		if(file->f_path.dentry->d_inode)		
-			CIFS_I(file->f_path.dentry->d_inode)->time = 0;
+		CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 
 		retval = cifs_revalidate(file->f_path.dentry);
 		if (retval < 0)

fs/cifs/file.c

@@ -792,12 +792,7 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 	int xid, long_op;
 	struct cifsFileInfo *open_file;
 
-	if (file->f_path.dentry == NULL)
-		return -EBADF;
-
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	if (cifs_sb == NULL)
-		return -EBADF;
 
 	pTcon = cifs_sb->tcon;
 
@@ -807,14 +802,9 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 
 	if (file->private_data == NULL)
 		return -EBADF;
-	else
-		open_file = (struct cifsFileInfo *) file->private_data;
+	open_file = (struct cifsFileInfo *) file->private_data;
 
 	xid = GetXid();
-	if (file->f_path.dentry->d_inode == NULL) {
-		FreeXid(xid);
-		return -EBADF;
-	}
 
 	if (*poffset > file->f_path.dentry->d_inode->i_size)
 		long_op = 2; /* writes past end of file can take a long time */
@@ -908,12 +898,7 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 	int xid, long_op;
 	struct cifsFileInfo *open_file;
 
-	if (file->f_path.dentry == NULL)
-		return -EBADF;
-
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-	if (cifs_sb == NULL)
-		return -EBADF;
 
 	pTcon = cifs_sb->tcon;
 
@@ -922,14 +907,9 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 
 	if (file->private_data == NULL)
 		return -EBADF;
-	else
-		open_file = (struct cifsFileInfo *)file->private_data;
+	open_file = (struct cifsFileInfo *)file->private_data;
 
 	xid = GetXid();
-	if (file->f_path.dentry->d_inode == NULL) {
-		FreeXid(xid);
-		return -EBADF;
-	}
 
 	if (*poffset > file->f_path.dentry->d_inode->i_size)
 		long_op = 2; /* writes past end of file can take a long time */
@@ -957,11 +937,6 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 					return -EBADF;
 			}
 			if (open_file->invalidHandle) {
-				if ((file->f_path.dentry == NULL) ||
-				   (file->f_path.dentry->d_inode == NULL)) {
-					FreeXid(xid);
-					return total_written;
-				}
 				/* we could deadlock if we called
 				   filemap_fdatawait from here so tell
 				   reopen_file not to flush data to 

fs/cifs/readdir.c

@@ -444,9 +444,6 @@ static int initiate_cifs_search(const int xid, struct file *file)
 	cifsFile->invalidHandle = TRUE;
 	cifsFile->srch_inf.endOfSearch = FALSE;
 
-	if(file->f_path.dentry == NULL)
-		return -ENOENT;
-
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 	if(cifs_sb == NULL)
 		return -EINVAL;
@@ -618,20 +615,10 @@ static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
    whether we can use the cached search results from the previous search */
 static int is_dir_changed(struct file * file)
 {
-	struct inode * inode;
-	struct cifsInodeInfo *cifsInfo;
-
-	if(file->f_path.dentry == NULL)
-		return 0;
-
-	inode = file->f_path.dentry->d_inode;
-
-	if(inode == NULL)
-		return 0;
-
-	cifsInfo = CIFS_I(inode);
+	struct inode *inode = file->f_path.dentry->d_inode;
+	struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
 
-	if(cifsInfo->time == 0)
+	if (cifsInfo->time == 0)
 		return 1; /* directory was changed, perhaps due to unlink */
 	else
 		return 0;
@@ -851,9 +838,6 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
 	if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 		return -ENOENT;
 
-	if(file->f_path.dentry == NULL)
-		return -ENOENT;
-
 	rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 	/* skip . and .. since we added them first */
 	if(rc != 0) 
@@ -997,11 +981,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 
 	xid = GetXid();
 
-	if(file->f_path.dentry == NULL) {
-		FreeXid(xid);
-		return -EIO;
-	}
-
 	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
 	pTcon = cifs_sb->tcon;
 	if(pTcon == NULL)