summaryrefslogtreecommitdiffstats
path: root/drivers/md/md.c
diff options
context:
space:
mode:
authorPaul Clements <paul.clements@steeleye.com>2006-10-03 01:15:49 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-03 08:04:17 -0700
commit9b1d1dac181d8c1b9492e05cee660a985d035a06 (patch)
treeaf12b1eaac4e0f7f3528ec26a223faeabed35845 /drivers/md/md.c
parent76186dd8b73d2b7b9b4c8629b89c845e97009801 (diff)
[PATCH] md: new sysfs interface for setting bits in the write-intent-bitmap
Add a new sysfs interface that allows the bitmap of an array to be dirtied. The interface is write-only, and is used as follows: echo "1000" > /sys/block/md2/md/bitmap (dirty the bit for chunk 1000 [offset 0] in the in-memory and on-disk bitmaps of array md2) echo "1000-2000" > /sys/block/md1/md/bitmap (dirty the bits for chunks 1000-2000 in md1's bitmap) This is useful, for example, in cluster environments where you may need to combine two disjoint bitmaps into one (following a server failure, after a secondary server has taken over the array). By combining the bitmaps on the two servers, a full resync can be avoided (This was discussed on the list back on March 18, 2005, "[PATCH 1/2] md bitmap bug fixes" thread). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8b08043f07e..b95dd8a183e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2524,6 +2524,36 @@ 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)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
@@ -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 = {