[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/sysfs/mount.c b/ap/os/linux/linux-3.4.x/fs/sysfs/mount.c
new file mode 100644
index 0000000..52c3bdb
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/sysfs/mount.c
@@ -0,0 +1,200 @@
+/*
+ * fs/sysfs/symlink.c - operations for initializing and mounting sysfs
+ *
+ * Copyright (c) 2001-3 Patrick Mochel
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ *
+ * Please see Documentation/filesystems/sysfs.txt for more information.
+ */
+
+#define DEBUG
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+
+#include "sysfs.h"
+
+
+static struct vfsmount *sysfs_mnt;
+struct kmem_cache *sysfs_dir_cachep;
+
+static const struct super_operations sysfs_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .evict_inode = sysfs_evict_inode,
+};
+
+struct sysfs_dirent sysfs_root = {
+ .s_name = "",
+ .s_count = ATOMIC_INIT(1),
+ .s_flags = SYSFS_DIR | (KOBJ_NS_TYPE_NONE << SYSFS_NS_TYPE_SHIFT),
+ .s_mode = S_IFDIR | S_IRUGO | S_IXUGO,
+ .s_ino = 1,
+};
+
+static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *inode;
+ struct dentry *root;
+
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = SYSFS_MAGIC;
+ sb->s_op = &sysfs_ops;
+ sb->s_time_gran = 1;
+
+ /* get root inode, initialize and unlock it */
+ mutex_lock(&sysfs_mutex);
+ inode = sysfs_get_inode(sb, &sysfs_root);
+ mutex_unlock(&sysfs_mutex);
+ if (!inode) {
+ pr_debug("sysfs: could not get root inode\n");
+ return -ENOMEM;
+ }
+
+ /* instantiate and link root dentry */
+ root = d_make_root(inode);
+ if (!root) {
+ pr_debug("%s: could not get root dentry!\n",__func__);
+ return -ENOMEM;
+ }
+ root->d_fsdata = &sysfs_root;
+ sb->s_root = root;
+ return 0;
+}
+
+static int sysfs_test_super(struct super_block *sb, void *data)
+{
+ struct sysfs_super_info *sb_info = sysfs_info(sb);
+ struct sysfs_super_info *info = data;
+ enum kobj_ns_type type;
+ int found = 1;
+
+ for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++) {
+ if (sb_info->ns[type] != info->ns[type])
+ found = 0;
+ }
+ return found;
+}
+
+static int sysfs_set_super(struct super_block *sb, void *data)
+{
+ int error;
+ error = set_anon_super(sb, data);
+ if (!error)
+ sb->s_fs_info = data;
+ return error;
+}
+
+static void free_sysfs_super_info(struct sysfs_super_info *info)
+{
+ int type;
+ for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++)
+ kobj_ns_drop(type, info->ns[type]);
+ kfree(info);
+}
+
+static struct dentry *sysfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ struct sysfs_super_info *info;
+ enum kobj_ns_type type;
+ struct super_block *sb;
+ int error;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++)
+ info->ns[type] = kobj_ns_grab_current(type);
+
+ sb = sget(fs_type, sysfs_test_super, sysfs_set_super, info);
+ if (IS_ERR(sb) || sb->s_fs_info != info)
+ free_sysfs_super_info(info);
+ if (IS_ERR(sb))
+ return ERR_CAST(sb);
+ if (!sb->s_root) {
+ sb->s_flags = flags;
+ error = sysfs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
+ if (error) {
+ deactivate_locked_super(sb);
+ return ERR_PTR(error);
+ }
+ sb->s_flags |= MS_ACTIVE;
+ }
+
+ return dget(sb->s_root);
+}
+
+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
+ * so we can't find it, before freeing sysfs_super_info.
+ */
+ kill_anon_super(sb);
+ free_sysfs_super_info(info);
+}
+
+static struct file_system_type sysfs_fs_type = {
+ .name = "sysfs",
+ .mount = sysfs_mount,
+ .kill_sb = sysfs_kill_sb,
+};
+
+int __init sysfs_init(void)
+{
+ int err = -ENOMEM;
+
+ sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",
+ sizeof(struct sysfs_dirent),
+ 0, 0, NULL);
+ if (!sysfs_dir_cachep)
+ goto out;
+
+ err = sysfs_inode_init();
+ if (err)
+ goto out_err;
+
+ err = register_filesystem(&sysfs_fs_type);
+ if (!err) {
+ sysfs_mnt = kern_mount(&sysfs_fs_type);
+ if (IS_ERR(sysfs_mnt)) {
+ printk(KERN_ERR "sysfs: could not mount!\n");
+ err = PTR_ERR(sysfs_mnt);
+ sysfs_mnt = NULL;
+ unregister_filesystem(&sysfs_fs_type);
+ goto out_err;
+ }
+ } else
+ goto out_err;
+out:
+ return err;
+out_err:
+ kmem_cache_destroy(sysfs_dir_cachep);
+ sysfs_dir_cachep = NULL;
+ goto out;
+}
+
+#undef sysfs_get
+struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd)
+{
+ return __sysfs_get(sd);
+}
+EXPORT_SYMBOL_GPL(sysfs_get);
+
+#undef sysfs_put
+void sysfs_put(struct sysfs_dirent *sd)
+{
+ __sysfs_put(sd);
+}
+EXPORT_SYMBOL_GPL(sysfs_put);