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writeback: splice dirty inode entries to default bdi on bdi_destroy()

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We cannot safely ensure that the inodes are all gone at this point
in time, and we must not destroy this bdi with inodes having off it.
So just splice our entries to the default bdi since that one will
always persist.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2009-09-14 12:57:56 +02:00
parent b6e51316da
commit ce5f8e7795
1 changed files with 13 additions and 1 deletions
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14
mm/backing-dev.c
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@ -668,7 +668,19 @@ void bdi_destroy(struct backing_dev_info *bdi)
{
int i;
WARN_ON(bdi_has_dirty_io(bdi));
/*
* Splice our entries to the default_backing_dev_info, if this
* bdi disappears
*/
if (bdi_has_dirty_io(bdi)) {
struct bdi_writeback *dst = &default_backing_dev_info.wb;
spin_lock(&inode_lock);
list_splice(&bdi->wb.b_dirty, &dst->b_dirty);
list_splice(&bdi->wb.b_io, &dst->b_io);
list_splice(&bdi->wb.b_more_io, &dst->b_more_io);
spin_unlock(&inode_lock);
}
bdi_unregister(bdi);