From cf0ca9fe5dd9e3693d935757a7b2fc50fc576554 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 30 Apr 2008 00:54:32 -0700 Subject: mm: bdi: export BDI attributes in sysfs Provide a place in sysfs (/sys/class/bdi) for the backing_dev_info object. This allows us to see and set the various BDI specific variables. In particular this properly exposes the read-ahead window for all relevant users and /sys/block//queue/read_ahead_kb should be deprecated. With patient help from Kay Sievers and Greg KH [mszeredi@suse.cz] - split off NFS and FUSE changes into separate patches - document new sysfs attributes under Documentation/ABI - do bdi_class_init as a core_initcall, otherwise the "default" BDI won't be initialized - remove bdi_init_fmt macro, it's not used very much [akpm@linux-foundation.org: fix ia64 warning] Signed-off-by: Peter Zijlstra Cc: Kay Sievers Acked-by: Greg KH Cc: Trond Myklebust Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- block/genhd.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'block') diff --git a/block/genhd.c b/block/genhd.c index 00da5219ee3..fda9c7a63c2 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -182,11 +182,17 @@ static int exact_lock(dev_t devt, void *data) */ void add_disk(struct gendisk *disk) { + struct backing_dev_info *bdi; + disk->flags |= GENHD_FL_UP; blk_register_region(MKDEV(disk->major, disk->first_minor), disk->minors, NULL, exact_match, exact_lock, disk); register_disk(disk); blk_register_queue(disk); + + bdi = &disk->queue->backing_dev_info; + bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor)); + sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi"); } EXPORT_SYMBOL(add_disk); @@ -194,6 +200,8 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ void unlink_gendisk(struct gendisk *disk) { + sysfs_remove_link(&disk->dev.kobj, "bdi"); + bdi_unregister(&disk->queue->backing_dev_info); blk_unregister_queue(disk); blk_unregister_region(MKDEV(disk->major, disk->first_minor), disk->minors); -- cgit v1.2.3