From: Yu Kuai <yukuai3@xxxxxxxxxx>
There are 3 APIs for now:
- bits: readonly, show status of bitmap bits, the number of each value;
- metadata: readonly show bitmap metadata, include chunksize, chunkshift,
chunks, offset and daemon_sleep;
- daemon_sleep: read-write, default value is 30;
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
Documentation/admin-guide/md.rst | 13 +++++
drivers/md/md-llbitmap.c | 96 ++++++++++++++++++++++++++++++++
2 files changed, 109 insertions(+)
diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst
index 356d2a344f08..2030772075b5 100644
--- a/Documentation/admin-guide/md.rst
+++ b/Documentation/admin-guide/md.rst
@@ -444,6 +444,19 @@ If bitmap_type is bitmap, then the md device will also contain:
once the array becomes non-degraded, and this fact has been
recorded in the metadata.
+If bitmap_type is llbitmap, then the md device will also contain:
+
+ llbitmap/bits
+ This is readonly, show status of bitmap bits, the number of each
+ value.
+
+ llbitmap/metadata
+ This is readonly, show bitmap metadata, include chunksize, chunkshift,
+ chunks, offset and daemon_sleep.
+
+ llbitmap/daemon_sleep
+ This is readwrite, time in seconds that daemon function will be
+ triggered to clear dirty bits.
As component devices are added to an md array, they appear in the ``md``
directory as new directories named::
diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c
index ae664aa110a8..38e67d4582ad 100644
--- a/drivers/md/md-llbitmap.c
+++ b/drivers/md/md-llbitmap.c
@@ -1391,4 +1391,100 @@ static void llbitmap_wait_behind_writes(struct mddev *mddev)
}
+static ssize_t bits_show(struct mddev *mddev, char *page)
+{
+ struct llbitmap *llbitmap;
+ int bits[nr_llbitmap_state] = {0};
+ loff_t start = 0;
+
+ mutex_lock(&mddev->bitmap_info.mutex);
+ llbitmap = mddev->bitmap;
+ if (!llbitmap || !llbitmap->pctl) {
+ mutex_unlock(&mddev->bitmap_info.mutex);
+ return sprintf(page, "no bitmap\n");
+ }
+
+ if (test_bit(BITMAP_WRITE_ERROR, &llbitmap->flags)) {
+ mutex_unlock(&mddev->bitmap_info.mutex);
+ return sprintf(page, "bitmap io error\n");
+ }
+
+ while (start < llbitmap->chunks) {
+ enum llbitmap_state c = llbitmap_read(llbitmap, start);
+
+ if (c < 0 || c >= nr_llbitmap_state)
+ pr_err("%s: invalid bit %llu state %d\n",
+ __func__, start, c);
+ else
+ bits[c]++;
+ start++;
+ }
+
+ mutex_unlock(&mddev->bitmap_info.mutex);
+ return sprintf(page, "unwritten %d\nclean %d\ndirty %d\nneed sync %d\nsyncing %d\n",
+ bits[BitUnwritten], bits[BitClean], bits[BitDirty],
+ bits[BitNeedSync], bits[BitSyncing]);
+}
+
+static struct md_sysfs_entry llbitmap_bits =
+__ATTR_RO(bits);
+
+static ssize_t metadata_show(struct mddev *mddev, char *page)
+{
+ struct llbitmap *llbitmap;
+ ssize_t ret;
+
+ mutex_lock(&mddev->bitmap_info.mutex);
+ llbitmap = mddev->bitmap;
+ if (!llbitmap) {
+ mutex_unlock(&mddev->bitmap_info.mutex);
+ return sprintf(page, "no bitmap\n");
+ }
+
+ ret = sprintf(page, "chunksize %lu\nchunkshift %lu\nchunks %lu\noffset %llu\ndaemon_sleep %lu\n",
+ llbitmap->chunksize, llbitmap->chunkshift,
+ llbitmap->chunks, mddev->bitmap_info.offset,
+ llbitmap->mddev->bitmap_info.daemon_sleep);
+ mutex_unlock(&mddev->bitmap_info.mutex);
+
+ return ret;
+}
+
+static struct md_sysfs_entry llbitmap_metadata =
+__ATTR_RO(metadata);
+
+static ssize_t
+daemon_sleep_show(struct mddev *mddev, char *page)
+{
+ return sprintf(page, "%lu\n", mddev->bitmap_info.daemon_sleep);
+}
+
+static ssize_t
+daemon_sleep_store(struct mddev *mddev, const char *buf, size_t len)
+{
+ unsigned long timeout;
+ int rv = kstrtoul(buf, 10, &timeout);
+
+ if (rv)
+ return rv;
+
+ mddev->bitmap_info.daemon_sleep = timeout;
+ return len;
+}
+
+static struct md_sysfs_entry llbitmap_daemon_sleep =
+__ATTR_RW(daemon_sleep);
+
+static struct attribute *md_llbitmap_attrs[] = {
+ &llbitmap_bits.attr,
+ &llbitmap_metadata.attr,
+ &llbitmap_daemon_sleep.attr,
+ NULL
+};
+
+static struct attribute_group md_llbitmap_group = {
+ .name = "llbitmap",
+ .attrs = md_llbitmap_attrs,
+};
+
#endif /* CONFIG_MD_LLBITMAP */
--
2.39.2
