patch-2.1.120 linux/fs/qnx4/symlinks.c

• Lines: 122
• Date: Tue Sep 1 10:43:13 1998
• Orig file: v2.1.119/linux/fs/qnx4/symlinks.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.119/linux/fs/qnx4/symlinks.c linux/fs/qnx4/symlinks.c
@@ -0,0 +1,121 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 21-06-1998 by Frank Denis : ugly changes to make it compile on Linux 2.1.99+
+ */
+
+/* THIS FILE HAS TO BE REWRITTEN */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/stat.h>
+
+#include <asm/segment.h>
+#include <asm/uaccess.h>
+
+static int qnx4_readlink(struct dentry *, char *, int);
+static struct dentry *qnx4_follow_link(struct dentry *, struct dentry *);
+
+/*
+ * symlinks can't do much...
+ */
+struct inode_operations qnx4_symlink_inode_operations =
+{
+	NULL,			/* no file-operations */
+#ifdef CONFIG_QNX4FS_RW
+	qnx4_create,		/* create */
+#else
+	NULL,
+#endif
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	qnx4_readlink,		/* readlink */
+	qnx4_follow_link,	/* follow_link */
+	NULL,			/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};
+
+static struct dentry *qnx4_follow_link(struct dentry *dentry,
+				       struct dentry *base)
+{
+#if 0
+	struct inode *inode = dentry->d_inode;
+	struct buffer_head *bh;
+
+	if (!inode) {
+		return ERR_PTR(-ENOENT);
+	}
+	if (current->link_count > 5) {
+		return ERR_PTR(-ELOOP);
+	}
+	if (!(bh = qnx4_bread(inode, 0, 0))) {
+		return ERR_PTR(-EIO);
+	}
+	current->link_count++;
+	current->link_count--;
+	brelse(bh);
+	return 0;
+#else
+	printk("qnx4: qnx4_follow_link needs to be fixed.\n");
+	return ERR_PTR(-EIO);
+#endif
+}
+
+static int qnx4_readlink(struct dentry *dentry, char *buffer, int buflen)
+{
+	struct inode *inode = dentry->d_inode;
+	struct buffer_head *bh;
+	int i;
+	char c;
+	struct qnx4_inode_info *qnx4_ino;
+
+	QNX4DEBUG(("qnx4: qnx4_readlink() called\n"));
+
+	if (buffer == NULL || inode == NULL || !S_ISLNK(inode->i_mode)) {
+		return -EINVAL;
+	}
+	qnx4_ino = &inode->u.qnx4_i;
+	if (buflen > 1023) {
+		buflen = 1023;
+	}
+	bh = bread(inode->i_dev, qnx4_ino->i_first_xtnt.xtnt_blk,
+		   QNX4_BLOCK_SIZE);
+	QNX4DEBUG(("qnx4: qnx4_bread sym called -> [%s]\n",
+		   bh->b_data));
+	if (bh == NULL) {
+		QNX4DEBUG(("qnx4: NULL symlink bh\n"));
+		return 0;
+	}
+	if (bh->b_data[0] != 0) {
+		i = 0;
+		while (i < buflen && (c = bh->b_data[i])) {
+			i++;
+			put_user(c, buffer++);
+		}
+		brelse(bh);
+		return i;
+	} else {
+		brelse(bh);
+		memcpy(buffer, "fixme", 5);
+		return 5;
+	}
+}