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 --- mm/readahead.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'mm/readahead.c') diff --git a/mm/readahead.c b/mm/readahead.c index 8762e8988972..d8723a5f6496 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -235,7 +235,13 @@ unsigned long max_sane_readahead(unsigned long nr) static int __init readahead_init(void) { - return bdi_init(&default_backing_dev_info); + int err; + + err = bdi_init(&default_backing_dev_info); + if (!err) + bdi_register(&default_backing_dev_info, NULL, "default"); + + return err; } subsys_initcall(readahead_init); -- cgit v1.2.3