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authorJens Axboe <jens.axboe@oracle.com>2009-09-09 09:10:25 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-11 09:20:26 +0200
commit500b067c5e6ceea49cf280a02597b1169320e08c (patch)
tree5e2e9bfd66f825f845fdf395b6303b884769ff6d /mm/backing-dev.c
parentd993831fa7ffeb89e994f046f93eeb09ec91df08 (diff)
downloadconfigs-500b067c5e6ceea49cf280a02597b1169320e08c.tar.gz
writeback: check for registered bdi in flusher add and inode dirty
Also a debugging aid. We want to catch dirty inodes being added to backing devices that don't do writeback. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5cb32c5b93d..d3ca0dac111 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -465,6 +465,12 @@ void static bdi_add_default_flusher_task(struct backing_dev_info *bdi)
if (!bdi_cap_writeback_dirty(bdi))
return;
+ if (WARN_ON(!test_bit(BDI_registered, &bdi->state))) {
+ printk(KERN_ERR "bdi %p/%s is not registered!\n",
+ bdi, bdi->name);
+ return;
+ }
+
/*
* Check with the helper whether to proceed adding a task. Will only
* abort if we two or more simultanous calls to
@@ -528,6 +534,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
}
bdi_debug_register(bdi, dev_name(dev));
+ set_bit(BDI_registered, &bdi->state);
exit:
return ret;
}