[PATCH] md: new sysfs interface for setting bits in the write-intent-bitmap
[sfrench/cifs-2.6.git] / drivers / md / md.c
index 8b08043f07ef09353c80dec4fd89f67bd03bbb6a..b95dd8a183ec9da71c0ab501f61577c770d3607f 100644 (file)
@@ -2523,6 +2523,36 @@ new_dev_store(mddev_t *mddev, const char *buf, size_t len)
 static struct md_sysfs_entry md_new_device =
 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
 
+static ssize_t
+bitmap_store(mddev_t *mddev, const char *buf, size_t len)
+{
+       char *end;
+       unsigned long chunk, end_chunk;
+
+       if (!mddev->bitmap)
+               goto out;
+       /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
+       while (*buf) {
+               chunk = end_chunk = simple_strtoul(buf, &end, 0);
+               if (buf == end) break;
+               if (*end == '-') { /* range */
+                       buf = end + 1;
+                       end_chunk = simple_strtoul(buf, &end, 0);
+                       if (buf == end) break;
+               }
+               if (*end && !isspace(*end)) break;
+               bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
+               buf = end;
+               while (isspace(*buf)) buf++;
+       }
+       bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
+out:
+       return len;
+}
+
+static struct md_sysfs_entry md_bitmap =
+__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
+
 static ssize_t
 size_show(mddev_t *mddev, char *page)
 {
@@ -2843,6 +2873,7 @@ static struct attribute *md_redundancy_attrs[] = {
        &md_sync_completed.attr,
        &md_suspend_lo.attr,
        &md_suspend_hi.attr,
+       &md_bitmap.attr,
        NULL,
 };
 static struct attribute_group md_redundancy_group = {