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btrfs: reada: bypass adding extent when all zone failed 

When failed adding all dev_zones for a reada_extent, the extent
will have no chance to be selected to run, and keep in memory
for ever.

We should bypass this extent to avoid above case.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2015-12-31 18:48:54 +08:00 committed by David Sterba
parent 6a159d2ae4
commit 3194502118
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/reada.c
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@ -330,6 +330,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
int nzones = 0;
unsigned long index = logical >> PAGE_CACHE_SHIFT;
int dev_replace_is_ongoing;
int have_zone = 0;
spin_lock(&fs_info->reada_lock);
re = radix_tree_lookup(&fs_info->reada_tree, index);
@ -456,10 +457,14 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
btrfs_dev_replace_unlock(&fs_info->dev_replace);
goto error;
}
have_zone = 1;
}
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_unlock(&fs_info->dev_replace);
if (!have_zone)
goto error;
btrfs_put_bbio(bbio);
return re;