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[PATCH] dm/md dependency tree in sysfs: holders/slaves subdirectory 

Creating "slaves" and "holders" directories in /sys/block/<disk> and
creating "holders" directory under /sys/block/<disk>/<partition>

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jun'ichi Nomura 2006-03-27 01:17:55 -08:00 committed by Linus Torvalds
parent 3ac51e741a
commit 6a4d44c1f1
2 changed files with 43 additions and 0 deletions
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36
fs/partitions/check.c
View File

@ -297,6 +297,30 @@ struct kobj_type ktype_part = {
.sysfs_ops = &part_sysfs_ops,
};
#ifdef CONFIG_SYSFS
static inline void partition_sysfs_add_subdir(struct hd_struct *p)
{
struct kobject *k;
k = kobject_get(&p->kobj);
p->holder_dir = kobject_add_dir(k, "holders");
kobject_put(k);
}
static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
{
struct kobject *k;
k = kobject_get(&disk->kobj);
disk->holder_dir = kobject_add_dir(k, "holders");
disk->slave_dir = kobject_add_dir(k, "slaves");
kobject_put(k);
}
#else
#define partition_sysfs_add_subdir(x) do { } while (0)
#define disk_sysfs_add_subdirs(x) do { } while (0)
#endif
void delete_partition(struct gendisk *disk, int part)
{
struct hd_struct *p = disk->part[part-1];
@ -310,6 +334,10 @@ void delete_partition(struct gendisk *disk, int part)
p->ios[0] = p->ios[1] = 0;
p->sectors[0] = p->sectors[1] = 0;
devfs_remove("%s/part%d", disk->devfs_name, part);
#ifdef CONFIG_SYSFS
if (p->holder_dir)
kobject_unregister(p->holder_dir);
#endif
kobject_unregister(&p->kobj);
}
@ -337,6 +365,7 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
p->kobj.parent = &disk->kobj;
p->kobj.ktype = &ktype_part;
kobject_register(&p->kobj);
partition_sysfs_add_subdir(p);
disk->part[part-1] = p;
}
@ -383,6 +412,7 @@ void register_disk(struct gendisk *disk)
if ((err = kobject_add(&disk->kobj)))
return;
disk_sysfs_symlinks(disk);
disk_sysfs_add_subdirs(disk);
kobject_uevent(&disk->kobj, KOBJ_ADD);
/* No minors to use for partitions */
@ -483,6 +513,12 @@ void del_gendisk(struct gendisk *disk)
devfs_remove_disk(disk);
#ifdef CONFIG_SYSFS
if (disk->holder_dir)
kobject_unregister(disk->holder_dir);
if (disk->slave_dir)
kobject_unregister(disk->slave_dir);
#endif
if (disk->driverfs_dev) {
char *disk_name = make_block_name(disk);
sysfs_remove_link(&disk->kobj, "device");

7
include/linux/genhd.h
View File

@ -78,6 +78,9 @@ struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
struct kobject kobj;
#ifdef CONFIG_SYSFS
struct kobject *holder_dir;
#endif
unsigned ios[2], sectors[2]; /* READs and WRITEs */
int policy, partno;
};
@ -114,6 +117,10 @@ struct gendisk {
int number; /* more of the same */
struct device *driverfs_dev;
struct kobject kobj;
#ifdef CONFIG_SYSFS
struct kobject *holder_dir;
struct kobject *slave_dir;
#endif
struct timer_rand_state *random;
int policy;