writeback: pass in super_block to bdi_start_writeback()
Sometimes we only want to write pages from a specific super_block,
so allow that to be passed in.
This fixes a problem with commit 56a131dcf7
causing writeback on all super_blocks on a bdi, where we only really
want to sync a specific sb from writeback_inodes_sb().
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@@ -101,7 +101,8 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
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const char *fmt, ...);
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int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
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void bdi_unregister(struct backing_dev_info *bdi);
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void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
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void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
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long nr_pages);
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int bdi_writeback_task(struct bdi_writeback *wb);
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int bdi_has_dirty_io(struct backing_dev_info *bdi);
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