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authorJörn Engel <joern@logfs.org>2010-04-25 08:54:42 +0200
committerJens Axboe <jens.axboe@oracle.com>2010-04-25 08:54:42 +0200
commit5129a469a91a91427334c40e29e64c6d0ab68caf (patch)
tree141a17cbea94c7c9c038187cc7081e1c688eac55 /mm/backing-dev.c
parent7e2455c1a123ceadbb35150a610d61e8443fd340 (diff)
Catch filesystems lacking s_bdi
noop_backing_dev_info is used only as a flag to mark filesystems that don't have any backing store, like tmpfs, procfs, spufs, etc. Signed-off-by: Joern Engel <joern@logfs.org> Changed the BUG_ON() to a WARN_ON(). Note that adding dirty inodes to the noop_backing_dev_info is not legal and will not result in them being flushed, but we already catch this condition in __mark_inode_dirty() when checking for a registered bdi. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index dbda4707f59..707d0dc6da0 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -27,6 +27,11 @@ struct backing_dev_info default_backing_dev_info = {
};
EXPORT_SYMBOL_GPL(default_backing_dev_info);
+struct backing_dev_info noop_backing_dev_info = {
+ .name = "noop",
+};
+EXPORT_SYMBOL_GPL(noop_backing_dev_info);
+
static struct class *bdi_class;
/*