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SYSFS: Allow boot time switching between deprecated and modern sysfs layout

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I have some systems which need legacy sysfs due to old tools that are
making assumptions that a directory can never be a symlink to another
directory, and it's a big hazzle to compile separate kernels for them.

This patch turns CONFIG_SYSFS_DEPRECATED into a run time option
that can be switched on/off the kernel command line. This way
the same binary can be used in both cases with just a option
on the command line.

The old CONFIG_SYSFS_DEPRECATED_V2 option is still there to set
the default. I kept the weird name to not break existing
config files.

Also the compat code can be still completely disabled by undefining
CONFIG_SYSFS_DEPRECATED_SWITCH -- just the optimizer takes
care of this now instead of lots of ifdefs. This makes the code
look nicer.

v2: This is an updated version on top of Kay's patch to only
handle the block devices. I tested it on my old systems
and that seems to work.

Cc: [email protected]
Signed-off-by: Andi Kleen <[email protected]>
Cc: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Andi Kleen 2010-09-08 16:54:17 +02:00 • committed by Greg Kroah-Hartman
commit e52eec13cd
7 changed files with 68 additions and 30 deletions
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7
block/genhd.c
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@ -22,9 +22,7 @@
#include "blk.h"
static DEFINE_MUTEX(block_class_lock);
#ifndef CONFIG_SYSFS_DEPRECATED
struct kobject *block_depr;
#endif
/* for extended dynamic devt allocation, currently only one major is used */
#define MAX_EXT_DEVT (1 << MINORBITS)
@ -803,10 +801,9 @@ static int __init genhd_device_init(void)
register_blkdev(BLOCK_EXT_MAJOR, "blkext");
#ifndef CONFIG_SYSFS_DEPRECATED
/* create top-level block dir */
block_depr = kobject_create_and_add("block", NULL);
#endif
if (!sysfs_deprecated)
block_depr = kobject_create_and_add("block", NULL);
return 0;
}