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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-04-30 00:54:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:49 -0700 |
| commit | cf0ca9fe5dd9e3693d935757a7b2fc50fc576554 (patch) | |
| tree | c795c5271eda9fc67579fa3176c646b892dfdb41 /block/genhd.c | |
| parent | caafa4324335aeb11bc233d5f87aca8cce30beba (diff) | |
| download | lwn-cf0ca9fe5dd9e3693d935757a7b2fc50fc576554.tar.gz lwn-cf0ca9fe5dd9e3693d935757a7b2fc50fc576554.zip | |
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/<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 <a.p.zijlstra@chello.nl>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Acked-by: Greg KH <greg@kroah.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c index 00da5219ee37..fda9c7a63c29 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); |