patch-1.3.7 linux/fs/smbfs/file.c

• Lines: 238
• Date: Sat Jul 1 19:00:18 1995
• Orig file: v1.3.6/linux/fs/smbfs/file.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.6/linux/fs/smbfs/file.c linux/fs/smbfs/file.c
@@ -0,0 +1,237 @@
+/*
+ *  file.c
+ *
+ *  Copyright (C) 1995 by Paal-Kr. Engstad and Volker Lendecke
+ *
+ */
+
+#include <linux/config.h>
+#ifdef MODULE
+#include <linux/module.h>
+#include <linux/version.h>
+#endif
+
+#include <asm/segment.h>
+#include <asm/system.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/mm.h>
+#include <linux/smb_fs.h>
+#include <linux/malloc.h>
+
+static int 
+smb_fsync(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+int
+smb_make_open(struct inode *i, int right)
+{
+        struct smb_dirent *dirent;
+        int open_result;
+
+        if (i == NULL) {
+                printk("smb_make_open: got NULL inode\n");
+                return -EINVAL;
+        }
+
+        dirent = &(SMB_INOP(i)->finfo);
+
+        DDPRINTK("smb_make_open: dirent->opened = %d\n", dirent->opened);
+
+        if ((dirent->opened) == 0) {
+                /* tries max. rights */
+                open_result = smb_proc_open(SMB_SERVER(i),
+                                            dirent->path, dirent->len,
+                                            dirent);
+                if (open_result) 
+                        return open_result;
+
+                dirent->opened = 1;
+        }
+
+        if (   ((right == O_RDONLY) && (   (dirent->access == O_RDONLY)
+                                        || (dirent->access == O_RDWR)))
+            || ((right == O_WRONLY) && (   (dirent->access == O_WRONLY)
+                                        || (dirent->access == O_RDWR)))
+            || ((right == O_RDWR)   && (dirent->access == O_RDWR)))
+                return 0;
+
+        return -EACCES;
+}
+
+static int 
+smb_file_read(struct inode *inode, struct file *file, char *buf, int count)
+{
+	int result, bufsize, to_read, already_read;
+	off_t pos;
+        int errno;
+
+        DPRINTK("smb_file_read: enter %s\n", SMB_FINFO(inode)->path);
+        
+	if (!inode) {
+		DPRINTK("smb_file_read: inode = NULL\n");
+		return -EINVAL;
+	}
+
+	if (!S_ISREG(inode->i_mode)) {
+		DPRINTK("smb_file_read: read from non-file, mode %07o\n",
+                        inode->i_mode);
+		return -EINVAL;
+	}
+
+        if ((errno = smb_make_open(inode, O_RDONLY)) != 0)
+                return errno;
+        
+	pos = file->f_pos;
+
+	if (pos + count > inode->i_size)
+		count = inode->i_size - pos;
+
+	if (count <= 0)
+		return 0;
+	bufsize = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 5;
+
+        already_read = 0;
+
+	/* First read in as much as possible for each bufsize. */
+        while (already_read < count) {
+
+                to_read = min(bufsize, count - already_read);
+
+		result = smb_proc_read(SMB_SERVER(inode), SMB_FINFO(inode),
+                                       pos, to_read, buf, 1);
+		if (result < 0)
+			return result;
+		pos += result;
+		buf += result;
+                already_read += result;
+
+		if (result < to_read) {
+                        break;
+		}
+	}
+
+        file->f_pos = pos;
+
+        DPRINTK("smb_file_read: exit %s\n", SMB_FINFO(inode)->path);
+
+        return already_read;
+}
+
+static int 
+smb_file_write(struct inode *inode, struct file *file, char *buf, int count)
+{
+	int result, bufsize, to_write, already_written;
+        off_t pos;
+        int errno;
+			  
+	if (!inode) {
+		DPRINTK("smb_file_write: inode = NULL\n");
+		return -EINVAL;
+	}
+
+	if (!S_ISREG(inode->i_mode)) {
+		DPRINTK("smb_file_write: write to non-file, mode %07o\n",
+                       inode->i_mode);
+		return -EINVAL;
+	}
+
+        DPRINTK("smb_file_write: enter %s\n", SMB_FINFO(inode)->path);
+
+	if (count <= 0)
+		return 0;
+
+        if ((errno = smb_make_open(inode, O_RDWR)) != 0)
+                return errno;
+        
+	pos = file->f_pos;
+
+	if (file->f_flags & O_APPEND)
+		pos = inode->i_size;
+
+	bufsize = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 5;
+
+        already_written = 0;
+
+        while (already_written < count) {
+
+                to_write = min(bufsize, count - already_written);
+
+		result = smb_proc_write(SMB_SERVER(inode), SMB_FINFO(inode), 
+					pos, to_write, buf);
+
+		if (result < 0)
+			return result;
+
+		pos += result;
+		buf += result;
+                already_written += result;
+
+		if (result < to_write) {
+			break;
+		}
+	}
+
+	file->f_pos = pos;
+
+        if (pos > inode->i_size) {
+                inode->i_size = pos;
+        }
+
+        DPRINTK("smb_file_write: exit %s\n", SMB_FINFO(inode)->path);
+
+	return already_written;
+}
+
+static struct file_operations smb_file_operations = {
+	NULL,			/* lseek - default */
+	smb_file_read,		/* read */
+	smb_file_write,		/* write */
+	NULL,			/* readdir - bad */
+	NULL,			/* select - default */
+	smb_ioctl,		/* ioctl */
+	smb_mmap,               /* mmap */
+	NULL,                   /* open */
+	NULL,                   /* release */
+	smb_fsync,		/* fsync */
+};
+
+struct inode_operations smb_file_inode_operations = {
+	&smb_file_operations,	/* default file operations */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	NULL,			/* readlink */
+	NULL,			/* follow_link */
+	NULL,			/* bmap */
+	NULL			/* truncate */
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 8
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -8
+ * c-argdecl-indent: 8
+ * c-label-offset: -8
+ * c-continued-statement-offset: 8
+ * c-continued-brace-offset: 0
+ * End:
+ */