[PATCH] md: allow sync-speed to be controlled per-device

Also export current (average) speed and status in sysfs.

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/Documentation/md.txt b/Documentation/md.txt
index b8d172b254f74a29f2b3c54203955109748c0266..03a13c462cf20ed8e09d85ead4b953cfad3b6218 100644 (file)
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -207,6 +207,28 @@ All md devices contain:
      available.  It will then appear at md/dev-XXX (depending on the
      name of the device) and further configuration is then possible.
 
+   sync_speed_min
+   sync_speed_max
+     This are similar to /proc/sys/dev/raid/speed_limit_{min,max}
+     however they only apply to the particular array.
+     If no value has been written to these, of if the word 'system'
+     is written, then the system-wide value is used.  If a value,
+     in kibibytes-per-second is written, then it is used.
+     When the files are read, they show the currently active value
+     followed by "(local)" or "(system)" depending on whether it is
+     a locally set or system-wide value.
+
+   sync_completed
+     This shows the number of sectors that have been completed of
+     whatever the current sync_action is, followed by the number of
+     sectors in total that could need to be processed.  The two
+     numbers are separated by a '/'  thus effectively showing one
+     value, a fraction of the process that is complete.
+
+   sync_speed
+     This shows the current actual speed, in K/sec, of the current
+     sync_action.  It is averaged over the last 30 seconds.
+
 
 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.c b/drivers/md/md.c
index 825e235b791bf55f2cf610f43d50a0681b36f18f..1b76fb29fb7065b1ac52aaa1db009515e16e46ca 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -81,10 +81,22 @@ static DEFINE_SPINLOCK(pers_lock);
  * idle IO detection.
  *
  * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
+ * or /sys/block/mdX/md/sync_speed_{min,max}
  */
 
 static int sysctl_speed_limit_min = 1000;
 static int sysctl_speed_limit_max = 200000;
+static inline int speed_min(mddev_t *mddev)
+{
+       return mddev->sync_speed_min ?
+               mddev->sync_speed_min : sysctl_speed_limit_min;
+}
+
+static inline int speed_max(mddev_t *mddev)
+{
+       return mddev->sync_speed_max ?
+               mddev->sync_speed_max : sysctl_speed_limit_max;
+}
 
 static struct ctl_table_header *raid_table_header;
 
@@ -2197,6 +2209,90 @@ md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
 static struct md_sysfs_entry
 md_mismatches = __ATTR_RO(mismatch_cnt);
 
+static ssize_t
+sync_min_show(mddev_t *mddev, char *page)
+{
+       return sprintf(page, "%d (%s)\n", speed_min(mddev),
+                      mddev->sync_speed_min ? "local": "system");
+}
+
+static ssize_t
+sync_min_store(mddev_t *mddev, const char *buf, size_t len)
+{
+       int min;
+       char *e;
+       if (strncmp(buf, "system", 6)==0) {
+               mddev->sync_speed_min = 0;
+               return len;
+       }
+       min = simple_strtoul(buf, &e, 10);
+       if (buf == e || (*e && *e != '\n') || min <= 0)
+               return -EINVAL;
+       mddev->sync_speed_min = min;
+       return len;
+}
+
+static struct md_sysfs_entry md_sync_min =
+__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
+
+static ssize_t
+sync_max_show(mddev_t *mddev, char *page)
+{
+       return sprintf(page, "%d (%s)\n", speed_max(mddev),
+                      mddev->sync_speed_max ? "local": "system");
+}
+
+static ssize_t
+sync_max_store(mddev_t *mddev, const char *buf, size_t len)
+{
+       int max;
+       char *e;
+       if (strncmp(buf, "system", 6)==0) {
+               mddev->sync_speed_max = 0;
+               return len;
+       }
+       max = simple_strtoul(buf, &e, 10);
+       if (buf == e || (*e && *e != '\n') || max <= 0)
+               return -EINVAL;
+       mddev->sync_speed_max = max;
+       return len;
+}
+
+static struct md_sysfs_entry md_sync_max =
+__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
+
+
+static ssize_t
+sync_speed_show(mddev_t *mddev, char *page)
+{
+       unsigned long resync, dt, db;
+       resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
+       dt = ((jiffies - mddev->resync_mark) / HZ);
+       if (!dt) dt++;
+       db = resync - (mddev->resync_mark_cnt);
+       return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
+}
+
+static struct md_sysfs_entry
+md_sync_speed = __ATTR_RO(sync_speed);
+
+static ssize_t
+sync_completed_show(mddev_t *mddev, char *page)
+{
+       unsigned long max_blocks, resync;
+
+       if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+               max_blocks = mddev->resync_max_sectors;
+       else
+               max_blocks = mddev->size << 1;
+
+       resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
+       return sprintf(page, "%lu / %lu\n", resync, max_blocks);
+}
+
+static struct md_sysfs_entry
+md_sync_completed = __ATTR_RO(sync_completed);
+
 static struct attribute *md_default_attrs[] = {
        &md_level.attr,
        &md_raid_disks.attr,
@@ -2210,6 +2306,10 @@ static struct attribute *md_default_attrs[] = {
 static struct attribute *md_redundancy_attrs[] = {
        &md_scan_mode.attr,
        &md_mismatches.attr,
+       &md_sync_min.attr,
+       &md_sync_max.attr,
+       &md_sync_speed.attr,
+       &md_sync_completed.attr,
        NULL,
 };
 static struct attribute_group md_redundancy_group = {
@@ -4433,10 +4533,10 @@ static void md_do_sync(mddev_t *mddev)
 
        printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
        printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
-               " %d KB/sec/disc.\n", sysctl_speed_limit_min);
+               " %d KB/sec/disc.\n", speed_min(mddev));
        printk(KERN_INFO "md: using maximum available idle IO bandwidth "
               "(but not more than %d KB/sec) for reconstruction.\n",
-              sysctl_speed_limit_max);
+              speed_max(mddev));
 
        is_mddev_idle(mddev); /* this also initializes IO event counters */
        /* we don't use the checkpoint if there's a bitmap */
@@ -4477,7 +4577,7 @@ static void md_do_sync(mddev_t *mddev)
 
                skipped = 0;
                sectors = mddev->pers->sync_request(mddev, j, &skipped,
-                                           currspeed < sysctl_speed_limit_min);
+                                           currspeed < speed_min(mddev));
                if (sectors == 0) {
                        set_bit(MD_RECOVERY_ERR, &mddev->recovery);
                        goto out;
@@ -4542,8 +4642,8 @@ static void md_do_sync(mddev_t *mddev)
                currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
                        /((jiffies-mddev->resync_mark)/HZ +1) +1;
 
-               if (currspeed > sysctl_speed_limit_min) {
-                       if ((currspeed > sysctl_speed_limit_max) ||
+               if (currspeed > speed_min(mddev)) {
+                       if ((currspeed > speed_max(mddev)) ||
                                        !is_mddev_idle(mddev)) {
                                msleep(500);
                                goto repeat;

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 68b929c079ab6a616ac249505041a0741b172f1e..617b9506c7609aca62e0b9401a3fa4705a8faec9 100644 (file)
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -143,6 +143,10 @@ struct mddev_s
        sector_t                        resync_mismatches; /* count of sectors where
                                                            * parity/replica mismatch found
                                                            */
+       /* if zero, use the system-wide default */
+       int                             sync_speed_min;
+       int                             sync_speed_max;
+
        int                             ok_start_degraded;
        /* recovery/resync flags 
         * NEEDED:   we might need to start a resync/recover