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mm: bdi: export BDI attributes in sysfs

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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

[[email protected]]

 - 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

[[email protected]: fix ia64 warning]
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Kay Sievers <[email protected]>
Acked-by: Greg KH <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Peter Zijlstra 2008-04-30 00:54:32 -07:00 • committed by Linus Torvalds
commit cf0ca9fe5d
8 changed files with 194 additions and 2 deletions
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8
mm/readahead.c
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@ -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);