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authorDavid Sterba <dsterba@suse.cz>2011-10-07 20:06:13 +0400
committerDavid Sterba <dsterba@suse.cz>2012-02-15 19:40:25 +0400
commit8a3344269465b26761b74493cfbeeaa75d821614 (patch)
tree31dbc7d96441b95825c70073c769fc7b3f674a75 /fs
parentc08782dacd7a098f2b8bca7f4a57a5b402e9e1e5 (diff)
downloadlinux-8a3344269465b26761b74493cfbeeaa75d821614.tar.xz
btrfs: silence warning in raid array setup
Raid array setup code creates an extent buffer in an usual way. When the PAGE_CACHE_SIZE is > super block size, the extent pages are not marked up-to-date, which triggers a WARN_ON in the following write_extent_buffer call. Add an explicit up-to-date call to silence the warning. Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/volumes.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 7ffdb154daec..d8f282b5baa9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4357,6 +4357,20 @@ int btrfs_read_sys_array(struct btrfs_root *root)
return -ENOMEM;
btrfs_set_buffer_uptodate(sb);
btrfs_set_buffer_lockdep_class(root->root_key.objectid, sb, 0);
+ /*
+ * The sb extent buffer is artifical and just used to read the system array.
+ * btrfs_set_buffer_uptodate() call does not properly mark all it's
+ * pages up-to-date when the page is larger: extent does not cover the
+ * whole page and consequently check_page_uptodate does not find all
+ * the page's extents up-to-date (the hole beyond sb),
+ * write_extent_buffer then triggers a WARN_ON.
+ *
+ * Regular short extents go through mark_extent_buffer_dirty/writeback cycle,
+ * but sb spans only this function. Add an explicit SetPageUptodate call
+ * to silence the warning eg. on PowerPC 64.
+ */
+ if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE)
+ SetPageUptodate(sb->first_page);
write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
array_size = btrfs_super_sys_array_size(super_copy);