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sysfs: make sysfs_dirent->s_element a union

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Make sd->s_element a union of sysfs_elem_{dir|symlink|attr|bin_attr}
and rename it to s_elem.  This is to achieve...

* some level of type checking : changing symlink to point to
  sysfs_dirent instead of kobject is much safer and less painful now.
* easier / standardized dereferencing
* allow sysfs_elem_* to contain more than one entry

Where possible, pointer is obtained by directly deferencing from sd
instead of going through other entities.  This reduces dependencies to
dentry, inode and kobject.  to_attr() and to_bin_attr() are unused now
and removed.

This is in preparation of object reference simplification.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo
2007-06-14 03:45:15 +09:00
committed by Greg Kroah-Hartman
parent 0c096b507f
commit 3e5190380e
7 changed files with 71 additions and 79 deletions
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23
fs/sysfs/symlink.c
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@@ -48,30 +48,15 @@ static void fill_object_path(struct kobject * kobj, char * buffer, int length)
static int sysfs_add_link(struct dentry * parent, const char * name, struct kobject * target)
{
struct sysfs_dirent * parent_sd = parent->d_fsdata;
struct sysfs_symlink * sl;
struct sysfs_dirent * sd;
int error;
error = -ENOMEM;
sl = kzalloc(sizeof(*sl), GFP_KERNEL);
if (!sl)
goto err_out;
sl->target_kobj = kobject_get(target);
sd = sysfs_new_dirent(name, sl, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
sd = sysfs_new_dirent(name, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
if (!sd)
goto err_out;
return -ENOMEM;
sd->s_elem.symlink.target_kobj = kobject_get(target);
sysfs_attach_dirent(sd, parent_sd, NULL);
return 0;
err_out:
if (sl) {
kobject_put(sl->target_kobj);
kfree(sl);
}
return error;
}
/**