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-rw-r--r--drivers/md/md.c197
1 files changed, 188 insertions, 9 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 34b6902cda46..f6562ee4c6fc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2185,6 +2185,176 @@ chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
+/*
+ * The array state can be:
+ *
+ * clear
+ * No devices, no size, no level
+ * Equivalent to STOP_ARRAY ioctl
+ * inactive
+ * May have some settings, but array is not active
+ * all IO results in error
+ * When written, doesn't tear down array, but just stops it
+ * suspended (not supported yet)
+ * All IO requests will block. The array can be reconfigured.
+ * Writing this, if accepted, will block until array is quiessent
+ * readonly
+ * no resync can happen. no superblocks get written.
+ * write requests fail
+ * read-auto
+ * like readonly, but behaves like 'clean' on a write request.
+ *
+ * clean - no pending writes, but otherwise active.
+ * When written to inactive array, starts without resync
+ * If a write request arrives then
+ * if metadata is known, mark 'dirty' and switch to 'active'.
+ * if not known, block and switch to write-pending
+ * If written to an active array that has pending writes, then fails.
+ * active
+ * fully active: IO and resync can be happening.
+ * When written to inactive array, starts with resync
+ *
+ * write-pending
+ * clean, but writes are blocked waiting for 'active' to be written.
+ *
+ * active-idle
+ * like active, but no writes have been seen for a while (100msec).
+ *
+ */
+enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
+ write_pending, active_idle, bad_word};
+char *array_states[] = {
+ "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
+ "write-pending", "active-idle", NULL };
+
+static int match_word(const char *word, char **list)
+{
+ int n;
+ for (n=0; list[n]; n++)
+ if (cmd_match(word, list[n]))
+ break;
+ return n;
+}
+
+static ssize_t
+array_state_show(mddev_t *mddev, char *page)
+{
+ enum array_state st = inactive;
+
+ if (mddev->pers)
+ switch(mddev->ro) {
+ case 1:
+ st = readonly;
+ break;
+ case 2:
+ st = read_auto;
+ break;
+ case 0:
+ if (mddev->in_sync)
+ st = clean;
+ else if (mddev->safemode)
+ st = active_idle;
+ else
+ st = active;
+ }
+ else {
+ if (list_empty(&mddev->disks) &&
+ mddev->raid_disks == 0 &&
+ mddev->size == 0)
+ st = clear;
+ else
+ st = inactive;
+ }
+ return sprintf(page, "%s\n", array_states[st]);
+}
+
+static int do_md_stop(mddev_t * mddev, int ro);
+static int do_md_run(mddev_t * mddev);
+static int restart_array(mddev_t *mddev);
+
+static ssize_t
+array_state_store(mddev_t *mddev, const char *buf, size_t len)
+{
+ int err = -EINVAL;
+ enum array_state st = match_word(buf, array_states);
+ switch(st) {
+ case bad_word:
+ break;
+ case clear:
+ /* stopping an active array */
+ if (mddev->pers) {
+ if (atomic_read(&mddev->active) > 1)
+ return -EBUSY;
+ err = do_md_stop(mddev, 0);
+ }
+ break;
+ case inactive:
+ /* stopping an active array */
+ if (mddev->pers) {
+ if (atomic_read(&mddev->active) > 1)
+ return -EBUSY;
+ err = do_md_stop(mddev, 2);
+ }
+ break;
+ case suspended:
+ break; /* not supported yet */
+ case readonly:
+ if (mddev->pers)
+ err = do_md_stop(mddev, 1);
+ else {
+ mddev->ro = 1;
+ err = do_md_run(mddev);
+ }
+ break;
+ case read_auto:
+ /* stopping an active array */
+ if (mddev->pers) {
+ err = do_md_stop(mddev, 1);
+ if (err == 0)
+ mddev->ro = 2; /* FIXME mark devices writable */
+ } else {
+ mddev->ro = 2;
+ err = do_md_run(mddev);
+ }
+ break;
+ case clean:
+ if (mddev->pers) {
+ restart_array(mddev);
+ spin_lock_irq(&mddev->write_lock);
+ if (atomic_read(&mddev->writes_pending) == 0) {
+ mddev->in_sync = 1;
+ mddev->sb_dirty = 1;
+ }
+ spin_unlock_irq(&mddev->write_lock);
+ } else {
+ mddev->ro = 0;
+ mddev->recovery_cp = MaxSector;
+ err = do_md_run(mddev);
+ }
+ break;
+ case active:
+ if (mddev->pers) {
+ restart_array(mddev);
+ mddev->sb_dirty = 0;
+ wake_up(&mddev->sb_wait);
+ err = 0;
+ } else {
+ mddev->ro = 0;
+ err = do_md_run(mddev);
+ }
+ break;
+ case write_pending:
+ case active_idle:
+ /* these cannot be set */
+ break;
+ }
+ if (err)
+ return err;
+ else
+ return len;
+}
+static struct md_sysfs_entry md_array_state = __ATTR(array_state, 0644, array_state_show, array_state_store);
+
static ssize_t
null_show(mddev_t *mddev, char *page)
{
@@ -2553,6 +2723,7 @@ static struct attribute *md_default_attrs[] = {
&md_metadata.attr,
&md_new_device.attr,
&md_safe_delay.attr,
+ &md_array_state.attr,
NULL,
};
@@ -2919,11 +3090,8 @@ static int restart_array(mddev_t *mddev)
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
err = 0;
- } else {
- printk(KERN_ERR "md: %s has no personality assigned.\n",
- mdname(mddev));
+ } else
err = -EINVAL;
- }
out:
return err;
@@ -2955,7 +3123,12 @@ static void restore_bitmap_write_access(struct file *file)
spin_unlock(&inode->i_lock);
}
-static int do_md_stop(mddev_t * mddev, int ro)
+/* mode:
+ * 0 - completely stop and dis-assemble array
+ * 1 - switch to readonly
+ * 2 - stop but do not disassemble array
+ */
+static int do_md_stop(mddev_t * mddev, int mode)
{
int err = 0;
struct gendisk *disk = mddev->gendisk;
@@ -2977,12 +3150,15 @@ static int do_md_stop(mddev_t * mddev, int ro)
invalidate_partition(disk, 0);
- if (ro) {
+ switch(mode) {
+ case 1: /* readonly */
err = -ENXIO;
if (mddev->ro==1)
goto out;
mddev->ro = 1;
- } else {
+ break;
+ case 0: /* disassemble */
+ case 2: /* stop */
bitmap_flush(mddev);
md_super_wait(mddev);
if (mddev->ro)
@@ -3002,7 +3178,7 @@ static int do_md_stop(mddev_t * mddev, int ro)
mddev->in_sync = 1;
md_update_sb(mddev);
}
- if (ro)
+ if (mode == 1)
set_disk_ro(disk, 1);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
}
@@ -3010,7 +3186,7 @@ static int do_md_stop(mddev_t * mddev, int ro)
/*
* Free resources if final stop
*/
- if (!ro) {
+ if (mode == 0) {
mdk_rdev_t *rdev;
struct list_head *tmp;
struct gendisk *disk;
@@ -3034,6 +3210,9 @@ static int do_md_stop(mddev_t * mddev, int ro)
export_array(mddev);
mddev->array_size = 0;
+ mddev->size = 0;
+ mddev->raid_disks = 0;
+
disk = mddev->gendisk;
if (disk)
set_capacity(disk, 0);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 10:45:32 +0000