patch-2.3.2 linux/fs/efs/file.c

• Lines: 73
• Date: Thu May 13 23:50:15 1999
• Orig file: v2.3.1/linux/fs/efs/file.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.1/linux/fs/efs/file.c linux/fs/efs/file.c
@@ -0,0 +1,72 @@
+/*
+ * file.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/efs_fs.h>
+
+static struct file_operations efs_file_operations = {
+	NULL,			/* lseek */
+	generic_file_read,	/* read */
+	NULL,			/* write */
+	NULL,			/* readdir */
+	NULL,			/* poll */
+	NULL,			/* ioctl */
+	generic_file_mmap,	/* mmap */
+	NULL,			/* open */
+	NULL,			/* flush */
+	NULL,			/* release */
+	NULL,			/* fsync */
+	NULL,			/* fasync */
+	NULL,			/* check_media_change */
+	NULL			/* revalidate */
+};
+
+struct inode_operations efs_file_inode_operations = {
+	&efs_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 */
+	generic_readpage,	/* readpage */
+	NULL,			/* writepage */
+	efs_bmap,		/* bmap */
+	NULL,			/* truncate */
+	NULL,			/* permission */
+	NULL			/* smap */
+};
+ 
+int efs_bmap(struct inode *inode, efs_block_t block) {
+
+	if (block < 0) {
+		printk(KERN_WARNING "EFS: bmap(): block < 0\n");
+		return 0;
+	}
+
+	/* are we about to read past the end of a file ? */
+	if (!(block < inode->i_blocks)) {
+#ifdef DEBUG
+		/*
+		 * i have no idea why this happens as often as it does
+		 */
+		printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
+			block,
+			inode->i_blocks,
+			inode->i_size);
+#endif
+		return 0;
+	}
+
+	return efs_map_block(inode, block);
+}
+