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-rw-r--r--fs/kernfs/dir.c71
-rw-r--r--fs/kernfs/kernfs-internal.h20
-rw-r--r--fs/sysfs/mount.c29
3 files changed, 100 insertions, 20 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index a4ca4de3cb21..246740a741ef 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -211,7 +211,7 @@ static int sysfs_alloc_ino(unsigned int *pino)
retry:
spin_lock(&sysfs_ino_lock);
- rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino);
+ rc = ida_get_new_above(&sysfs_ino_ida, 1, &ino);
spin_unlock(&sysfs_ino_lock);
if (rc == -EAGAIN) {
@@ -253,9 +253,11 @@ EXPORT_SYMBOL_GPL(kernfs_get);
void kernfs_put(struct sysfs_dirent *sd)
{
struct sysfs_dirent *parent_sd;
+ struct kernfs_root *root;
if (!sd || !atomic_dec_and_test(&sd->s_count))
return;
+ root = kernfs_root(sd);
repeat:
/* Moving/renaming is always done while holding reference.
* sd->s_parent won't change beneath us.
@@ -278,8 +280,13 @@ void kernfs_put(struct sysfs_dirent *sd)
kmem_cache_free(sysfs_dir_cachep, sd);
sd = parent_sd;
- if (sd && atomic_dec_and_test(&sd->s_count))
- goto repeat;
+ if (sd) {
+ if (atomic_dec_and_test(&sd->s_count))
+ goto repeat;
+ } else {
+ /* just released the root sd, free @root too */
+ kfree(root);
+ }
}
EXPORT_SYMBOL_GPL(kernfs_put);
@@ -493,13 +500,15 @@ static void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
if (sd->s_flags & SYSFS_FLAG_REMOVED)
return;
- sysfs_unlink_sibling(sd);
+ if (sd->s_parent) {
+ sysfs_unlink_sibling(sd);
- /* Update timestamps on the parent */
- ps_iattr = sd->s_parent->s_iattr;
- if (ps_iattr) {
- struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
- ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
+ /* Update timestamps on the parent */
+ ps_iattr = sd->s_parent->s_iattr;
+ if (ps_iattr) {
+ ps_iattr->ia_iattr.ia_ctime = CURRENT_TIME;
+ ps_iattr->ia_iattr.ia_mtime = CURRENT_TIME;
+ }
}
sd->s_flags |= SYSFS_FLAG_REMOVED;
@@ -604,6 +613,49 @@ struct sysfs_dirent *kernfs_find_and_get_ns(struct sysfs_dirent *parent,
EXPORT_SYMBOL_GPL(kernfs_find_and_get_ns);
/**
+ * kernfs_create_root - create a new kernfs hierarchy
+ * @priv: opaque data associated with the new directory
+ *
+ * Returns the root of the new hierarchy on success, ERR_PTR() value on
+ * failure.
+ */
+struct kernfs_root *kernfs_create_root(void *priv)
+{
+ struct kernfs_root *root;
+ struct sysfs_dirent *sd;
+
+ root = kzalloc(sizeof(*root), GFP_KERNEL);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+
+ sd = sysfs_new_dirent("", S_IFDIR | S_IRUGO | S_IXUGO, SYSFS_DIR);
+ if (!sd) {
+ kfree(root);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ sd->s_flags &= ~SYSFS_FLAG_REMOVED;
+ sd->priv = priv;
+ sd->s_dir.root = root;
+
+ root->sd = sd;
+
+ return root;
+}
+
+/**
+ * kernfs_destroy_root - destroy a kernfs hierarchy
+ * @root: root of the hierarchy to destroy
+ *
+ * Destroy the hierarchy anchored at @root by removing all existing
+ * directories and destroying @root.
+ */
+void kernfs_destroy_root(struct kernfs_root *root)
+{
+ kernfs_remove(root->sd); /* will also free @root */
+}
+
+/**
* kernfs_create_dir_ns - create a directory
* @parent: parent in which to create a new directory
* @name: name of the new directory
@@ -626,6 +678,7 @@ struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,
if (!sd)
return ERR_PTR(-ENOMEM);
+ sd->s_dir.root = parent->s_dir.root;
sd->s_ns = ns;
sd->priv = priv;
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 62ae35f997f7..7dfe06278350 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -25,6 +25,12 @@ struct sysfs_elem_dir {
unsigned long subdirs;
/* children rbtree starts here and goes through sd->s_rb */
struct rb_root children;
+
+ /*
+ * The kernfs hierarchy this directory belongs to. This fits
+ * better directly in sysfs_dirent but is here to save space.
+ */
+ struct kernfs_root *root;
};
struct sysfs_elem_symlink {
@@ -104,6 +110,20 @@ static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
return sd->s_flags & SYSFS_TYPE_MASK;
}
+/**
+ * kernfs_root - find out the kernfs_root a sysfs_dirent belongs to
+ * @sd: sysfs_dirent of interest
+ *
+ * Return the kernfs_root @sd belongs to.
+ */
+static inline struct kernfs_root *kernfs_root(struct sysfs_dirent *sd)
+{
+ /* if parent exists, it's always a dir; otherwise, @sd is a dir */
+ if (sd->s_parent)
+ sd = sd->s_parent;
+ return sd->s_dir.root;
+}
+
/*
* Context structure to be used while adding/removing nodes.
*/
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 7cbd1fce2826..0b5661b462f7 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -32,15 +32,8 @@ static const struct super_operations sysfs_ops = {
.evict_inode = sysfs_evict_inode,
};
-static struct sysfs_dirent sysfs_root = {
- .s_name = "",
- .s_count = ATOMIC_INIT(1),
- .s_flags = SYSFS_DIR,
- .s_mode = S_IFDIR | S_IRUGO | S_IXUGO,
- .s_ino = 1,
-};
-
-struct sysfs_dirent *sysfs_root_sd = &sysfs_root;
+static struct kernfs_root *sysfs_root;
+struct sysfs_dirent *sysfs_root_sd;
static int sysfs_fill_super(struct super_block *sb)
{
@@ -68,6 +61,7 @@ static int sysfs_fill_super(struct super_block *sb)
pr_debug("%s: could not get root dentry!\n", __func__);
return -ENOMEM;
}
+ kernfs_get(sysfs_root_sd);
root->d_fsdata = sysfs_root_sd;
sb->s_root = root;
sb->s_d_op = &sysfs_dentry_ops;
@@ -138,11 +132,15 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type,
static void sysfs_kill_sb(struct super_block *sb)
{
struct sysfs_super_info *info = sysfs_info(sb);
- /* Remove the superblock from fs_supers/s_instances
+ struct sysfs_dirent *root_sd = sb->s_root->d_fsdata;
+
+ /*
+ * Remove the superblock from fs_supers/s_instances
* so we can't find it, before freeing sysfs_super_info.
*/
kill_anon_super(sb);
free_sysfs_super_info(info);
+ kernfs_put(root_sd);
}
static struct file_system_type sysfs_fs_type = {
@@ -166,12 +164,21 @@ int __init sysfs_init(void)
if (err)
goto out_err;
+ sysfs_root = kernfs_create_root(NULL);
+ if (IS_ERR(sysfs_root)) {
+ err = PTR_ERR(sysfs_root);
+ goto out_err;
+ }
+ sysfs_root_sd = sysfs_root->sd;
+
err = register_filesystem(&sysfs_fs_type);
if (err)
- goto out_err;
+ goto out_destroy_root;
return 0;
+out_destroy_root:
+ kernfs_destroy_root(sysfs_root);
out_err:
kmem_cache_destroy(sysfs_dir_cachep);
sysfs_dir_cachep = NULL;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 09:39:18 +0000