[PATCH 37/61] sysfs: separate out sysfs_attach_dentry()

Greg Kroah-Hartman
2007-07-11T23:50:20Z

Consolidate sd <-> dentry association into sysfs_attach_dentry() and
call it after dentry and inode are properly set up. This is in
preparation of sysfs_drop_dentry() updates.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/sysfs/dir.c | 59 +++++++++++++++++++++++------------------------------
fs/sysfs/inode.c | 4 +-
fs/sysfs/sysfs.h | 3 +-
3 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index e0d377a..01eeb4b 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -142,14 +142,24 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
return NULL;
}

+static void sysfs_attach_dentry(struct sysfs_dirent *sd, struct dentry *dentry)
+{
+ dentry->d_op = &sysfs_dentry_ops;
+ dentry->d_fsdata = sysfs_get(sd);
+
+ /* protect sd->s_dentry against sysfs_d_iput */
+ spin_lock(&sysfs_lock);
+ sd->s_dentry = dentry;
+ spin_unlock(&sysfs_lock);
+
+ d_rehash(dentry);
+}
+
void sysfs_attach_dirent(struct sysfs_dirent *sd,
struct sysfs_dirent *parent_sd, struct dentry *dentry)
{
- if (dentry) {
- sd->s_dentry = dentry;
- dentry->d_fsdata = sysfs_get(sd);
- dentry->d_op = &sysfs_dentry_ops;
- }
+ if (dentry)
+ sysfs_attach_dentry(sd, dentry);

if (parent_sd) {
sd->s_parent = sysfs_get(parent_sd);
@@ -229,15 +239,13 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
if (!sd)
goto out_drop;
sd->s_elem.dir.kobj = kobj;
- sysfs_attach_dirent(sd, parent->d_fsdata, dentry);

- error = sysfs_create(dentry, mode, init_dir);
+ error = sysfs_create(sd, dentry, mode, init_dir);
if (error)
goto out_sput;

inc_nlink(parent->d_inode);
- dentry->d_op = &sysfs_dentry_ops;
- d_rehash(dentry);
+ sysfs_attach_dirent(sd, parent->d_fsdata, dentry);

*p_dentry = dentry;
error = 0;
@@ -308,42 +316,28 @@ static int sysfs_attach_attr(struct sysfs_dirent * sd, struct dentry * dentry)
init = init_file;
}

- dentry->d_fsdata = sysfs_get(sd);
- /* protect sd->s_dentry against sysfs_d_iput */
- spin_lock(&sysfs_lock);
- sd->s_dentry = dentry;
- spin_unlock(&sysfs_lock);
- error = sysfs_create(dentry, (attr->mode & S_IALLUGO) | S_IFREG, init);
- if (error) {
- sysfs_put(sd);
+ error = sysfs_create(sd, dentry,
+ (attr->mode & S_IALLUGO) | S_IFREG, init);
+ if (error)
return error;
- }

if (bin_attr) {
dentry->d_inode->i_size = bin_attr->size;
dentry->d_inode->i_fop = &bin_fops;
}
- dentry->d_op = &sysfs_dentry_ops;
- d_rehash(dentry);
+
+ sysfs_attach_dentry(sd, dentry);

return 0;
}

static int sysfs_attach_link(struct sysfs_dirent * sd, struct dentry * dentry)
{
- int err = 0;
+ int err;

- dentry->d_fsdata = sysfs_get(sd);
- /* protect sd->s_dentry against sysfs_d_iput */
- spin_lock(&sysfs_lock);
- sd->s_dentry = dentry;
- spin_unlock(&sysfs_lock);
- err = sysfs_create(dentry, S_IFLNK|S_IRWXUGO, init_symlink);
- if (!err) {
- dentry->d_op = &sysfs_dentry_ops;
- d_rehash(dentry);
- } else
- sysfs_put(sd);
+ err = sysfs_create(sd, dentry, S_IFLNK|S_IRWXUGO, init_symlink);
+ if (!err)
+ sysfs_attach_dentry(sd, dentry);

return err;
}
@@ -773,7 +767,6 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
d_instantiate(shadow, igrab(inode));
inc_nlink(inode);
inc_nlink(parent->d_inode);
- shadow->d_op = &sysfs_dentry_ops;

dget(shadow); /* Extra count - pin the dentry in core */

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index d9ccc83..88857a3 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -156,13 +156,13 @@ struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd)
return inode;
}

-int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
+int sysfs_create(struct sysfs_dirent *sd, struct dentry *dentry, int mode,
+ int (*init)(struct inode *))
{
int error = 0;
struct inode * inode = NULL;
if (dentry) {
if (!dentry->d_inode) {
- struct sysfs_dirent * sd = dentry->d_fsdata;
if ((inode = sysfs_new_inode(mode, sd))) {
if (dentry->d_parent && dentry->d_parent->d_inode) {
struct inode *p_inode = dentry->d_parent->d_inode;
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 8b09e9d..9fa77d6 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -58,7 +58,8 @@ extern struct kmem_cache *sysfs_dir_cachep;

extern void sysfs_delete_inode(struct inode *inode);
extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
-extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
+extern int sysfs_create(struct sysfs_dirent *sd, struct dentry *dentry,
+ int mode, int (*init)(struct inode *));

extern void release_sysfs_dirent(struct sysfs_dirent * sd);
extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
--
1.5.2.2