Imported reiserfsprogs-3.6.20

libreiserfs/extent.c

@@ -0,0 +1,103 @@
+/*
+ *  Copyright 2000-2004 by Hans Reiser, licensing governed by 
+ *  reiserfsprogs/README
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "reiserfs/libreiserfs.h"
+#include "misc/unaligned.h"
+
+/* check item length, ih_free_space for pure 3.5 format, unformatted node
+   pointers */
+int reiserfs_ext_check (reiserfs_filsys_t * fs, 
+			     reiserfs_ih_t * ih, 
+			     char * item,
+			     unfm_func_t func)
+{
+    unsigned int i;
+    __u32 * ind = (__u32 *)item;
+
+    if (reiserfs_ih_get_len (ih) % REISERFS_EXT_SIZE)
+	return 1;
+
+    for (i = 0; i < reiserfs_ext_count (ih); i ++) {
+	if (!ind [i])
+	    continue;
+	if (func && func (fs, d32_get (ind, i)))
+	    return 1;
+    }
+
+    if (fs->fs_format == REISERFS_FORMAT_3_5) {
+	/* check ih_free_space for 3.5 format only */
+	if (reiserfs_ih_get_free (ih) > fs->fs_blocksize - 1)
+	    return 1;
+    }
+    
+    return 0;
+}
+
+//
+// printing of extent item
+//
+static void start_new_sequence (__u32 * start, int * len, __u32 new)
+{
+    *start = new;
+    *len = 1;
+}
+
+static int sequence_finished (__u32 start, int * len, __u32 new)
+{
+    if (le32_to_cpu (start) == MAX_INT)
+	return 1;
+
+    if (start == 0 && new == 0) {
+	(*len) ++;
+	return 0;
+    }
+    if (start != 0 && (le32_to_cpu (start) + *len) == le32_to_cpu (new)) {
+	(*len) ++;
+	return 0;
+    }
+    return 1;
+}
+
+static void print_sequence (FILE * fp, __u32 start, int len)
+{
+    if (start == MAX_INT)
+	return;
+
+    if (len == 1)
+	reiserfs_warning (fp, " %d", le32_to_cpu (start));
+    else
+	reiserfs_warning (fp, " %d(%d)", le32_to_cpu (start), len);
+}
+
+void reiserfs_ext_print(FILE * fp, 
+			     reiserfs_bh_t * bh, 
+			     int item_num)
+{
+    reiserfs_ih_t * ih;
+    unsigned int j;
+    __u32 * unp, prev = MAX_INT;
+    int num = 0;
+
+    ih = reiserfs_ih_at (bh, item_num);
+    unp = (__u32 *)reiserfs_item_by_ih (bh, ih);
+
+    if (reiserfs_ih_get_len (ih) % REISERFS_EXT_SIZE)
+	reiserfs_warning (fp, "reiserfs_ext_print: invalid item len");  
+
+    reiserfs_warning (fp, "%d pointer%s\n[", reiserfs_ext_count (ih),
+                      reiserfs_ext_count (ih) != 1 ? "s" : "" );
+    for (j = 0; j < reiserfs_ext_count (ih); j ++) {
+	if (sequence_finished (prev, &num, d32_get(unp, j))) {
+	    print_sequence (fp, prev, num);
+	    start_new_sequence (&prev, &num, d32_get(unp, j));
+	}
+    }
+    print_sequence (fp, prev, num);
+    reiserfs_warning (fp, "]\n");
+}