Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / qnx4 / dir.c

diff --git a/kernel/fs/qnx4/dir.c b/kernel/fs/qnx4/dir.c
new file mode 100644 (file)
index 0000000..b218f96
--- /dev/null
+++ b/kernel/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,
+};