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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 /include/linux/backing-dev.h
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 'include/linux/backing-dev.h')
-rw-r--r--include/linux/backing-dev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index e19c677f219c..bd0e3c6f323f 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -247,6 +247,7 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
#endif
extern struct backing_dev_info default_backing_dev_info;
+extern struct backing_dev_info noop_backing_dev_info;
void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page);
int writeback_in_progress(struct backing_dev_info *bdi);