Initial import

1 files changed, 81 insertions, 0 deletions

diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
new file mode 100644
index 000000000..b218f9658
--- /dev/null
+++ b/fs/qnx4/dir.c
@@ -0,0 +1,81 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
+ */
+
+#include <linux/buffer_head.h>
+#include "qnx4.h"
+
+static int qnx4_readdir(struct file *file, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(file);
+	unsigned int offset;
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct qnx4_link_info *le;
+	unsigned long blknum;
+	int ix, ino;
+	int size;
+
+	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
+	QNX4DEBUG((KERN_INFO "pos                 = %ld\n", (long) ctx->pos));
+
+	while (ctx->pos < inode->i_size) {
+		blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
+		bh = sb_bread(inode->i_sb, blknum);
+		if (bh == NULL) {
+			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
+			return 0;
+		}
+		ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
+		for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
+			offset = ix * QNX4_DIR_ENTRY_SIZE;
+			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
+			if (!de->di_fname[0])
+				continue;
+			if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)))
+				continue;
+			if (!(de->di_status & QNX4_FILE_LINK))
+				size = QNX4_SHORT_NAME_MAX;
+			else
+				size = QNX4_NAME_MAX;
+			size = strnlen(de->di_fname, size);
+			QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
+			if (!(de->di_status & QNX4_FILE_LINK))
+				ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
+			else {
+				le  = (struct qnx4_link_info*)de;
+				ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
+					QNX4_INODES_PER_BLOCK +
+					le->dl_inode_ndx;
+			}
+			if (!dir_emit(ctx, de->di_fname, size, ino, DT_UNKNOWN)) {
+				brelse(bh);
+				return 0;
+			}
+		}
+		brelse(bh);
+	}
+	return 0;
+}
+
+const struct file_operations qnx4_dir_operations =
+{
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.iterate	= qnx4_readdir,
+	.fsync		= generic_file_fsync,
+};
+
+const struct inode_operations qnx4_dir_inode_operations =
+{
+	.lookup		= qnx4_lookup,
+};