sysfs: make kobj point to sysfs_dirent instead of dentry
As kobj sysfs dentries and inodes are gonna be made reclaimable,
dentry can't be used as naming token for sysfs file/directory, replace
kobj->dentry with kobj->sd. The only external interface change is
shadow directory handling. All other changes are contained in kobj
and sysfs.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 4762a9a..31b6cf3 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -368,9 +368,10 @@
return sd;
}
-static int create_dir(struct kobject *kobj, struct dentry *parent,
- const char *name, struct dentry **p_dentry)
+static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
+ const char *name, struct sysfs_dirent **p_sd)
{
+ struct dentry *parent = parent_sd->s_dentry;
int error;
umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
struct dentry *dentry;
@@ -409,14 +410,14 @@
/* link in */
error = -EEXIST;
- if (sysfs_find_dirent(parent->d_fsdata, name))
+ if (sysfs_find_dirent(parent_sd, name))
goto out_iput;
sysfs_instantiate(dentry, inode);
inc_nlink(parent->d_inode);
- sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
+ sysfs_attach_dirent(sd, parent_sd, dentry);
- *p_dentry = dentry;
+ *p_sd = sd;
error = 0;
goto out_unlock; /* pin directory dentry in core */
@@ -433,38 +434,37 @@
return error;
}
-
-int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
+int sysfs_create_subdir(struct kobject *kobj, const char *name,
+ struct sysfs_dirent **p_sd)
{
- return create_dir(k,k->dentry,n,d);
+ return create_dir(kobj, kobj->sd, name, p_sd);
}
/**
* sysfs_create_dir - create a directory for an object.
* @kobj: object we're creating directory for.
- * @shadow_parent: parent parent object.
+ * @shadow_parent: parent object.
*/
-
-int sysfs_create_dir(struct kobject * kobj, struct dentry *shadow_parent)
+int sysfs_create_dir(struct kobject *kobj,
+ struct sysfs_dirent *shadow_parent_sd)
{
- struct dentry * dentry = NULL;
- struct dentry * parent;
+ struct sysfs_dirent *parent_sd, *sd;
int error = 0;
BUG_ON(!kobj);
- if (shadow_parent)
- parent = shadow_parent;
+ if (shadow_parent_sd)
+ parent_sd = shadow_parent_sd;
else if (kobj->parent)
- parent = kobj->parent->dentry;
+ parent_sd = kobj->parent->sd;
else if (sysfs_mount && sysfs_mount->mnt_sb)
- parent = sysfs_mount->mnt_sb->s_root;
+ parent_sd = sysfs_mount->mnt_sb->s_root->d_fsdata;
else
return -EFAULT;
- error = create_dir(kobj,parent,kobject_name(kobj),&dentry);
+ error = create_dir(kobj, parent_sd, kobject_name(kobj), &sd);
if (!error)
- kobj->dentry = dentry;
+ kobj->sd = sd;
return error;
}
@@ -525,18 +525,16 @@
.setattr = sysfs_setattr,
};
-static void remove_dir(struct dentry * d)
+static void remove_dir(struct sysfs_dirent *sd)
{
- struct dentry *parent = d->d_parent;
- struct sysfs_dirent *sd = d->d_fsdata;
+ struct dentry *parent = sd->s_parent->s_dentry;
mutex_lock(&parent->d_inode->i_mutex);
sysfs_unlink_sibling(sd);
sd->s_flags |= SYSFS_FLAG_REMOVED;
- pr_debug(" o %s removing done (%d)\n",d->d_name.name,
- atomic_read(&d->d_count));
+ pr_debug(" o %s removing done\n", sd->s_name);
mutex_unlock(&parent->d_inode->i_mutex);
@@ -545,25 +543,26 @@
sysfs_put(sd);
}
-void sysfs_remove_subdir(struct dentry * d)
+void sysfs_remove_subdir(struct sysfs_dirent *sd)
{
- remove_dir(d);
+ remove_dir(sd);
}
-static void __sysfs_remove_dir(struct dentry *dentry)
+static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd)
{
struct sysfs_dirent *removed = NULL;
- struct sysfs_dirent *parent_sd;
struct sysfs_dirent **pos;
+ struct dentry *dir;
- if (!dentry)
+ if (!dir_sd)
return;
- pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
- mutex_lock(&dentry->d_inode->i_mutex);
- parent_sd = dentry->d_fsdata;
- pos = &parent_sd->s_children;
+ dir = dir_sd->s_dentry;
+
+ pr_debug("sysfs %s: removing dir\n", dir_sd->s_name);
+ mutex_lock(&dir->d_inode->i_mutex);
+ pos = &dir_sd->s_children;
while (*pos) {
struct sysfs_dirent *sd = *pos;
@@ -575,7 +574,7 @@
} else
pos = &(*pos)->s_sibling;
}
- mutex_unlock(&dentry->d_inode->i_mutex);
+ mutex_unlock(&dir->d_inode->i_mutex);
while (removed) {
struct sysfs_dirent *sd = removed;
@@ -588,7 +587,7 @@
sysfs_put(sd);
}
- remove_dir(dentry);
+ remove_dir(dir_sd);
}
/**
@@ -602,25 +601,25 @@
void sysfs_remove_dir(struct kobject * kobj)
{
- struct dentry *d = kobj->dentry;
+ struct sysfs_dirent *sd = kobj->sd;
spin_lock(&kobj_sysfs_assoc_lock);
- kobj->dentry = NULL;
+ kobj->sd = NULL;
spin_unlock(&kobj_sysfs_assoc_lock);
- __sysfs_remove_dir(d);
+ __sysfs_remove_dir(sd);
}
-int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
+int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
const char *new_name)
{
- struct sysfs_dirent *sd = kobj->dentry->d_fsdata;
- struct sysfs_dirent *parent_sd = new_parent->d_fsdata;
+ struct sysfs_dirent *sd = kobj->sd;
+ struct dentry *new_parent = new_parent_sd->s_dentry;
struct dentry *new_dentry;
char *dup_name;
int error;
- if (!new_parent)
+ if (!new_parent_sd)
return -EFAULT;
down_write(&sysfs_rename_sem);
@@ -637,9 +636,9 @@
* shadows of the same directory
*/
error = -EINVAL;
- if (kobj->dentry->d_parent->d_inode != new_parent->d_inode ||
+ if (sd->s_parent->s_dentry->d_inode != new_parent->d_inode ||
new_dentry->d_parent->d_inode != new_parent->d_inode ||
- new_dentry == kobj->dentry)
+ new_dentry == sd->s_dentry)
goto out_dput;
error = -EEXIST;
@@ -661,12 +660,12 @@
/* move under the new parent */
d_add(new_dentry, NULL);
- d_move(kobj->dentry, new_dentry);
+ d_move(sd->s_dentry, new_dentry);
sysfs_unlink_sibling(sd);
- sysfs_get(parent_sd);
+ sysfs_get(new_parent_sd);
sysfs_put(sd->s_parent);
- sd->s_parent = parent_sd;
+ sd->s_parent = new_parent_sd;
sysfs_link_sibling(sd);
error = 0;
@@ -691,9 +690,9 @@
int error;
old_parent_dentry = kobj->parent ?
- kobj->parent->dentry : sysfs_mount->mnt_sb->s_root;
+ kobj->parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
new_parent_dentry = new_parent ?
- new_parent->dentry : sysfs_mount->mnt_sb->s_root;
+ new_parent->sd->s_dentry : sysfs_mount->mnt_sb->s_root;
if (old_parent_dentry->d_inode == new_parent_dentry->d_inode)
return 0; /* nothing to move */
@@ -705,7 +704,7 @@
}
new_parent_sd = new_parent_dentry->d_fsdata;
- sd = kobj->dentry->d_fsdata;
+ sd = kobj->sd;
new_dentry = lookup_one_len(kobj->name, new_parent_dentry,
strlen(kobj->name));
@@ -715,7 +714,7 @@
} else
error = 0;
d_add(new_dentry, NULL);
- d_move(kobj->dentry, new_dentry);
+ d_move(sd->s_dentry, new_dentry);
dput(new_dentry);
/* Remove from old parent's list and insert into new parent's list. */
@@ -885,7 +884,7 @@
struct inode *inode;
struct inode_operations *i_op;
- inode = kobj->dentry->d_inode;
+ inode = kobj->sd->s_dentry->d_inode;
if (inode->i_op != &sysfs_dir_inode_operations)
return -EINVAL;
@@ -912,16 +911,16 @@
* directory.
*/
-struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
+struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj)
{
- struct dentry *dir = kobj->dentry;
+ struct dentry *dir = kobj->sd->s_dentry;
struct inode *inode = dir->d_inode;
struct dentry *parent = dir->d_parent;
struct sysfs_dirent *parent_sd = parent->d_fsdata;
struct dentry *shadow;
struct sysfs_dirent *sd;
- shadow = ERR_PTR(-EINVAL);
+ sd = ERR_PTR(-EINVAL);
if (!sysfs_is_shadowed_inode(inode))
goto out;
@@ -944,25 +943,25 @@
dget(shadow); /* Extra count - pin the dentry in core */
out:
- return shadow;
+ return sd;
nomem:
dput(shadow);
- shadow = ERR_PTR(-ENOMEM);
+ sd = ERR_PTR(-ENOMEM);
goto out;
}
/**
* sysfs_remove_shadow_dir - remove an object's directory.
- * @shadow: dentry of shadow directory
+ * @shadow_sd: sysfs_dirent of shadow directory
*
* The only thing special about this is that we remove any files in
* the directory before we remove the directory, and we've inlined
* what used to be sysfs_rmdir() below, instead of calling separately.
*/
-void sysfs_remove_shadow_dir(struct dentry *shadow)
+void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd)
{
- __sysfs_remove_dir(shadow);
+ __sysfs_remove_dir(shadow_sd);
}
const struct file_operations sysfs_dir_operations = {