[PATCH] md: include sector number in messages about corrected read errors

This is generally useful, but particularly helps see if it is the same sector
that always needs correcting, or different ones.

[akpm@osdl.org: fix printk warnings]
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 30 insertions, 7 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 5a479d692fac..1efe22a2d041 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1509,6 +1509,9 @@ static void raid1d(mddev_t *mddev)
                                                                          s<<9, conf->tmppage, READ) == 0)
                                                                 /* Well, this device is dead */
                                                                 md_error(mddev, rdev);
+                                                        else
+                                                                printk(KERN_INFO "raid1:%s: read error corrected (%d sectors at %llu on %s)\n",
+                                                                       mdname(mddev), s, (unsigned long long)(sect + rdev->data_offset), bdevname(rdev->bdev, b));
                                                 }
                                         }
                                 } else {
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7f636283a1ba..016ddb831c9b 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1492,6 +1492,10 @@ static void raid10d(mddev_t *mddev)
                                                                          s<<9, conf->tmppage, READ) == 0)
                                                                 /* Well, this device is dead */
                                                                 md_error(mddev, rdev);
+                                                        else
+                                                                printk(KERN_INFO "raid10:%s: read error corrected (%d sectors at %llu on %s)\n",
+                                                                       mdname(mddev), s, (unsigned long long)(sect+rdev->data_offset), bdevname(rdev->bdev, b));
+
                                                         rdev_dec_pending(rdev, mddev);
                                                         rcu_read_lock();
                                                 }
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 56303ff31730..450066007160 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -523,6 +523,8 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
         raid5_conf_t *conf = sh->raid_conf;
         int disks = sh->disks, i;
         int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
+        char b[BDEVNAME_SIZE];
+        mdk_rdev_t *rdev;
 
         if (bi->bi_size)
                 return 1;
@@ -570,25 +572,39 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
                 set_bit(R5_UPTODATE, &sh->dev[i].flags);
 #endif
                 if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
-                        printk(KERN_INFO "raid5: read error corrected!!\n");
+                        rdev = conf->disks[i].rdev;
+                        printk(KERN_INFO "raid5:%s: read error corrected (%lu sectors at %llu on %s)\n",
+                               mdname(conf->mddev), STRIPE_SECTORS,
+                               (unsigned long long)sh->sector + rdev->data_offset,
+                               bdevname(rdev->bdev, b));
                         clear_bit(R5_ReadError, &sh->dev[i].flags);
                         clear_bit(R5_ReWrite, &sh->dev[i].flags);
                 }
                 if (atomic_read(&conf->disks[i].rdev->read_errors))
                         atomic_set(&conf->disks[i].rdev->read_errors, 0);
         } else {
+                const char *bdn = bdevname(conf->disks[i].rdev->bdev, b);
                 int retry = 0;
+                rdev = conf->disks[i].rdev;
+
                 clear_bit(R5_UPTODATE, &sh->dev[i].flags);
-                atomic_inc(&conf->disks[i].rdev->read_errors);
+                atomic_inc(&rdev->read_errors);
                 if (conf->mddev->degraded)
-                        printk(KERN_WARNING "raid5: read error not correctable.\n");
+                        printk(KERN_WARNING "raid5:%s: read error not correctable (sector %llu on %s).\n",
+                               mdname(conf->mddev),
+                               (unsigned long long)sh->sector + rdev->data_offset,
+                               bdn);
                 else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
                         /* Oh, no!!! */
-                        printk(KERN_WARNING "raid5: read error NOT corrected!!\n");
-                else if (atomic_read(&conf->disks[i].rdev->read_errors)
+                        printk(KERN_WARNING "raid5:%s: read error NOT corrected!! (sector %llu on %s).\n",
+                               mdname(conf->mddev),
+                               (unsigned long long)sh->sector + rdev->data_offset,
+                               bdn);
+                else if (atomic_read(&rdev->read_errors)
                          > conf->max_nr_stripes)
                         printk(KERN_WARNING
-                               "raid5: Too many read errors, failing device.\n");
+                               "raid5:%s: Too many read errors, failing device %s.\n",
+                               mdname(conf->mddev), bdn);
                 else
                         retry = 1;
                 if (retry)
@@ -596,7 +612,7 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
                 else {
                         clear_bit(R5_ReadError, &sh->dev[i].flags);
                         clear_bit(R5_ReWrite, &sh->dev[i].flags);
-                        md_error(conf->mddev, conf->disks[i].rdev);
+                        md_error(conf->mddev, rdev);
                 }
         }
         rdev_dec_pending(conf->disks[i].rdev, conf->mddev);