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sysfs: flatten cleanup paths in sysfs_add_link() and create_dir() 

Flatten cleanup paths in sysfs_add_link() and create_dir() to improve
readability and ease further changes to these functions.  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 03:45:14 +09:00 committed by Greg Kroah-Hartman
parent 93e3cd8270
commit dfeb9fb034
2 changed files with 57 additions and 41 deletions
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73
fs/sysfs/dir.c
View File

@ -207,40 +207,53 @@ static int init_symlink(struct inode * inode)
return 0;
}
static int create_dir(struct kobject * k, struct dentry * p,
const char * n, struct dentry ** d)
static int create_dir(struct kobject *kobj, struct dentry *parent,
const char *name, struct dentry **p_dentry)
{
int error;
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
struct dentry *dentry;
struct sysfs_dirent *sd;
mutex_lock(&p->d_inode->i_mutex);
*d = lookup_one_len(n, p, strlen(n));
if (!IS_ERR(*d)) {
if (sysfs_dirent_exist(p->d_fsdata, n))
error = -EEXIST;
else
error = sysfs_make_dirent(p->d_fsdata, *d, k, mode,
SYSFS_DIR);
if (!error) {
error = sysfs_create(*d, mode, init_dir);
if (!error) {
inc_nlink(p->d_inode);
(*d)->d_op = &sysfs_dentry_ops;
d_rehash(*d);
}
}
if (error && (error != -EEXIST)) {
struct sysfs_dirent *sd = (*d)->d_fsdata;
if (sd) {
list_del_init(&sd->s_sibling);
sysfs_put(sd);
}
d_drop(*d);
}
dput(*d);
} else
error = PTR_ERR(*d);
mutex_unlock(&p->d_inode->i_mutex);
mutex_lock(&parent->d_inode->i_mutex);
dentry = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
goto out_unlock;
}
error = -EEXIST;
if (sysfs_dirent_exist(parent->d_fsdata, name))
goto out_dput;
error = sysfs_make_dirent(parent->d_fsdata, dentry, kobj, mode,
SYSFS_DIR);
if (error)
goto out_drop;
error = sysfs_create(dentry, mode, init_dir);
if (error)
goto out_sput;
inc_nlink(parent->d_inode);
dentry->d_op = &sysfs_dentry_ops;
d_rehash(dentry);
*p_dentry = dentry;
error = 0;
goto out_dput;
out_sput:
sd = dentry->d_fsdata;
list_del_init(&sd->s_sibling);
sysfs_put(sd);
out_drop:
d_drop(dentry);
out_dput:
dput(dentry);
out_unlock:
mutex_unlock(&parent->d_inode->i_mutex);
return error;
}

25
fs/sysfs/symlink.c
View File

@ -49,30 +49,33 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
{
struct sysfs_dirent * parent_sd = parent->d_fsdata;
struct sysfs_symlink * sl;
int error = 0;
int error;
error = -ENOMEM;
sl = kmalloc(sizeof(*sl), GFP_KERNEL);
sl = kzalloc(sizeof(*sl), GFP_KERNEL);
if (!sl)
goto exit1;
goto err_out;
sl->link_name = kmalloc(strlen(name) + 1, GFP_KERNEL);
if (!sl->link_name)
goto exit2;
goto err_out;
strcpy(sl->link_name, name);
sl->target_kobj = kobject_get(target);
error = sysfs_make_dirent(parent_sd, NULL, sl, S_IFLNK|S_IRWXUGO,
SYSFS_KOBJ_LINK);
if (!error)
return 0;
if (error)
goto err_out;
kobject_put(target);
kfree(sl->link_name);
exit2:
kfree(sl);
exit1:
return 0;
err_out:
if (sl) {
kobject_put(sl->target_kobj);
kfree(sl->link_name);
kfree(sl);
}
return error;
}