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Subject[PATCH 04/14] sysfs: flatten cleanup paths in sysfs_add_link() and create_dir()
Date
From
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>
---
fs/sysfs/dir.c | 73 ++++++++++++++++++++++++++++++---------------------
fs/sysfs/symlink.c | 27 ++++++++++--------
2 files changed, 58 insertions(+), 42 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 8b1a00a..99a0ba1 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -177,40 +177,53 @@ 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;
}

diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 7b9c5bf..b463f17 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -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;
-
- kobject_put(target);
- kfree(sl->link_name);
-exit2:
- kfree(sl);
-exit1:
+ if (error)
+ goto err_out;
+
+ return 0;
+
+ err_out:
+ if (sl) {
+ kobject_put(sl->target_kobj);
+ kfree(sl->link_name);
+ kfree(sl);
+ }
return error;
}

--
1.5.0.3

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