btrfs: reada: add all reachable mirrors into reada device list

If some device is not reachable, we should bypass and continus addingb
next, instead of break on bad device.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index b2f768a..27a2fe9 100644 (file)
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -328,7 +328,6 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
        u64 length;
        int real_stripes;
        int nzones = 0;
-       int i;
        unsigned long index = logical >> PAGE_CACHE_SHIFT;
        int dev_replace_is_ongoing;
 
@@ -375,9 +374,9 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
                dev = bbio->stripes[nzones].dev;
                zone = reada_find_zone(fs_info, dev, logical, bbio);
                if (!zone)
-                       break;
+                       continue;
 
-               re->zones[nzones] = zone;
+               re->zones[re->nzones++] = zone;
                spin_lock(&zone->lock);
                if (!zone->elems)
                        kref_get(&zone->refcnt);
@@ -387,8 +386,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
                kref_put(&zone->refcnt, reada_zone_release);
                spin_unlock(&fs_info->reada_lock);
        }
-       re->nzones = nzones;
-       if (nzones == 0) {
+       if (re->nzones == 0) {
                /* not a single zone found, error and out */
                goto error;
        }
@@ -413,8 +411,9 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
        prev_dev = NULL;
        dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(
                        &fs_info->dev_replace);
-       for (i = 0; i < nzones; ++i) {
-               dev = bbio->stripes[i].dev;
+       for (nzones = 0; nzones < re->nzones; ++nzones) {
+               dev = re->zones[nzones]->device;
+
                if (dev == prev_dev) {
                        /*
                         * in case of DUP, just add the first zone. As both
@@ -445,8 +444,8 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
                prev_dev = dev;
                ret = radix_tree_insert(&dev->reada_extents, index, re);
                if (ret) {
-                       while (--i >= 0) {
-                               dev = bbio->stripes[i].dev;
+                       while (--nzones >= 0) {
+                               dev = re->zones[nzones]->device;
                                BUG_ON(dev == NULL);
                                /* ignore whether the entry was inserted */
                                radix_tree_delete(&dev->reada_extents, index);
@@ -465,10 +464,9 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
        return re;
 
 error:
-       while (nzones) {
+       for (nzones = 0; nzones < re->nzones; ++nzones) {
                struct reada_zone *zone;
 
-               --nzones;
                zone = re->zones[nzones];
                kref_get(&zone->refcnt);
                spin_lock(&zone->lock);